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Swedan, S. E. K. "Performance analysis of user access methods in the U.K. ISDN." Thesis, University of Strathclyde, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381142.
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Hoßfeld, Tobias. "Performance Evaluation of Future Internet Applications and Emerging User Behavior." Doctoral thesis, kostenfrei, 2009. http://www.opus-bayern.de/uni-wuerzburg/volltexte/2009/3757/.
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Tolun, M. R. "Performance evaluation and user interface design for isolated speech recognition." Thesis, University of Kent, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355191.
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Peña, Ortiz Raúl. "Accurate workload design for web performance evaluation." Doctoral thesis, Editorial Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/21054.
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Las nuevas aplicaciones y servicios web, cada vez má¡s populares en nuestro día a día, han cambiado completamente la forma en la que los usuarios interactúan con la Web.
En menos de media década, el papel que juegan los usuarios ha evolucionado de meros consumidores pasivos de información a activos colaboradores en la creación de contenidos dinámicos, típicos de la Web actual.
Y, además, esta tendencia se espera que aumente y se consolide con el paso del tiempo.
Este comportamiento dinámico de los usuarios es una de las principales claves en la definición de cargas de trabajo adecuadas para estimar con precisión el rendimiento de los sistemas web.
No obstante, la dificultad intrínseca a la caracterización del dinamismo del usuario y su aplicación en un modelo de carga, propicia que muchos trabajos de investigación sigan todavía empleando cargas no representativas de las navegaciones web actuales.
Esta tesis doctoral se centra en la caracterización y reproducción, para estudios de evaluación de prestaciones, de un tipo de carga web más realista, capaz de imitar el comportamiento de los usuarios de la Web actual.
El estado del arte en el modelado y generación de cargas para los estudios de prestaciones de la Web presenta varias carencias en relación a modelos y aplicaciones software que representen los diferentes niveles de dinamismo del usuario.
Este hecho nos motiva a proponer un modelo más preciso y a desarrollar un nuevo generador de carga basado en este nuevo modelo.
Ambas propuestas han sido validadas en relación a una aproximación tradicional de generación de carga web.
Con este fin, se ha desarrollado un nuevo entorno de experimentación con la capacidad de reproducir cargas web tradicionales y dinámicas, mediante la integración del generador propuesto con un benchmark de uso común.
En esta tesis doctoral también se analiza y evalúa por primera vez, según nuestro saber y entender, el impacto que tiene el empleo de cargas de trabajo dinámicas en las métricaPeña Ortiz, R. (2013). Accurate workload design for web performance evaluation [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/21054
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Sulaiman, Norrozila. "Performance evaluation of user mobility on QoS classes in a 3G network." Thesis, University of Newcastle Upon Tyne, 2008. http://hdl.handle.net/10443/525.
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The popularity of IP services is increasing and the demand for managing traffic with different QoS classes has become more challenging. The stability of the system is affected by the rate of voice traffic. Mobility allows users to be connected at all time where handover may occur as it is not always possible to be connected to the same base station. Mobility and handover cause severe interference, which affects overall throughput and capacity of the system. The system requires greater capacity with more coverage area. This study deals with the impact of user mobility on voice quality in IP based application in a 3G Network. The aim is to improve the system performance in mixed traffic environment. A mathematical model is used to analyse the impact of using different type of coder on packet end-to-end delay and packet loss. The simulation results indicate that types of coder affect the system performance. Application of scheduling based on weight and load balancing technique can improve the system performance. The deployment of scheduling based on weight and a load balancing technique have been investigated to reduce the end-to-end delay and to improve overall performance in mixed traffic environment. The results under different conditions are analysed and it is found that by applying scheduling scheme, the quality of voice communication can be improved. In addition, load balancing technique can be used to improve the performance of the system. Apart from the decrease in delay, the technique can increase the capacity of the system and the overall stability of the system can be further improved. Finally, network security is another important aspect of network administration. Security policies have to be defined and implemented so that critical sections of the network are protected against unwarranted traffic or unauthorized personnel. The impact of implementing IPSec has been tested for voice communication over IP in a 3G network. Implementing the security protocol does not significantly degrade the performance of the system.
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Koskela, T. (Timo). "Community-centric mobile peer-to-peer services: performance evaluation and user studies." Doctoral thesis, Oulun yliopisto, 2011. http://urn.fi/urn:isbn:9789514296000.
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Abstract The popularity of social networking services emphasises the importance of user communities. As the next evolutionary step, social networking will evolve towards user communities that are dynamically established according to contextual aspects such as the shared location and/or activities of people. In this vision, distributed peer-to-peer (P2P) technologies provide a respectable alternative to the centralised client-server technologies for implementing the upcoming community-centric mobile services. This thesis focuses on the development of enabling techniques and methods for a community-centric mobile service environment and on the evaluation of users’ perceptions and user acceptance of novel community-centric mobile services. The research was carried out by first examining the applicability of different P2P system architectures for implementing the management of user communities. Next, an experimental prototype of a community-centric mobile service environment was implemented. The experimental prototype was used for evaluating the performance of the community-centric mobile service environment and for conducting the user studies of novel community-centric mobile services. The evaluation was conducted in a real deployment environment with test users. The main results are the following: (1) a conceptual analysis of the advantages and disadvantages of P2P group management systems that are implemented using architecturally distinct P2P system architectures; (2) a performance evaluation of a P2P community management system, in which each community is implemented as an independent structured P2P overlay network; (3) a novel community-centric mobile service environment and its core component, a mobile middleware, which enables the use of P2P technologies and context information as part of Web-based applications running on a Web browser; (4) an evaluation of users’ perceptions and user acceptance of novel community-centric mobile services that are related to making a selection of an entertainment premise based on its music style and voting for music in a user communityTiivistelmä Käyttäjäyhteisöiden tärkeys on korostunut sosiaalista verkottumista edistävien palveluiden suosion kautta. Seuraavaksi sosiaalinen verkottuminen tulee laajentumaan yhteisöihin, jotka perustetaan dynaamisesti muun muassa ihmisten yhteisen sijainnin ja/tai toiminnan perusteella. Tulevaisuuden yhteisöllisten mobiilipalveluiden toteutuksessa hajautetut vertaisverkkoteknologiat tarjoavat varteenotettavan vaihtoehdon keskitetyille asiakas-palvelin -teknologioille. Tämä väitöskirjatyö keskittyy kehittämään tarvittavia tekniikoita ja menetelmiä yhteisöllisen mobiilipalveluympäristön toteuttamiseen sekä arvioimaan käyttäjien kokemuksia uusista yhteisöllisistä mobiilipalveluista. Tutkimuksessa tarkasteltiin aluksi arkkitehtuurillisesti erilaisten vertaisverkkojärjestelmien sopivuutta käyttäjäyhteisöjen hallinnan toteutettamiseksi. Seuraavaksi tutkimuksessa toteutettiin kokeellinen prototyyppi yhteisöllisestä mobiilipalveluympäristöstä. Kokeellista prototyyppiä hyödynnettiin sekä yhteisöllisen mobiilipalveluympäristön suorituskyvyn että uusien yhteisöllisten mobiilipalveluiden käyttäjäkokemuksen arvioinnissa. Arviointi suoritettiin aidossa käyttöympäristössä testikäyttäjien avulla. Väitöskirjatyön keskisimmät tulokset ovat seuraavat: (1) käsitteellinen analyysi arkkitehtuurillisesti erilaisten vertaisverkkojärjestelmien vahvuuksista ja heikkouksista ryhmänhallintajärjestelmän toteuttamisessa; (2) sellaisen yhteisönhallintajärjestelmän arviointi, jossa jokainen yhteisö on toteutettu erillisen ja itsenäisen rakenteellisen vertaisverkon avulla; (3) uusi yhteisöllinen mobiilipalveluympäristö, jonka keskeisin osa mobiili välikerrosohjelmisto mahdollistaa vertaisverkkoteknologioiden ja kontekstitiedon käyttämisen selaimessa toimivissa Web-sovelluksissa; (4) sellaisten uusien yhteisöllisten mobiilipalveluiden käyttäjäkokemuksen arviointi, jotka liittyvät vapaa-ajan viettopaikan valitaan musiikin perusteella ja soitettavan musiikin äänestämiseen käyttäjäyhteisöissä
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Hanusaik, Linda Irene. "An evaluation of user performance with inductive coupling of hearing aids and telephone receivers incorporating receiver amplification." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29863.
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Previous research has shown the benefit obtained by hard of hearing people when using inductive means (T-switch) to couple their hearing aids to telephone receivers. Benefit provided by receiver amplification in the telephone handset has also been shown. Informal surveys of hard of hearing people indicate that many of them use telephones having a dual capability: magnetic coupling and receiver amplification. The objective of this investigation was to study user performance with this dual capability. In particular, the effect of receiver amplification on the speech perception ability (as measured by R-SPIN test items) of 10 hard of hearing subjects using inductive means to couple their hearing aid to a telephone receiver was examined under both good and poor telephone line conditions. The influence of the predictability of the speech material presented was also investigated by noting any difference between the subjects' performance on high predictability items and performance on low predictability items (of the R-SPIN test).
Results showed that the use of receiver amplification in conjunction with inductive coupling significantly improved the subjects' speech perception scores. Not surprisingly, good telephone line conditions also significantly improved the subjects' scores. Improvement due to receiver amplification was noted, irrespective of line conditions. Similarly, improvement due to good line conditions was observed, irrespective of whether amplification was used or not. Both receiver amplification and good line conditions had significant and positive effects on both low predictability and high predictability scores. We conclude that with speech either in or out of context, receiver amplification will be of benefit to those who use inductive coupling. Clinical implications and recommendations are discussed.Medicine, Faculty of
Audiology and Speech Sciences, School of
Graduate
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Sorvari, Sonja. "Case Study: Detecting End-User Problems. Performance of Heuristic Evaluation Compared to Think Aloud." Thesis, Uppsala universitet, Institutionen för informatik och media, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447073.
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There are currently multiple usability evaluation methods in use. Some of them involve users whereas others do not. It is commonly assumed that the usability problems found via user-involved methods are real problems that the end-users may face when using the product in real situations. In this study, one usability evaluation method that does not involve users, Heuristic Evaluation, was evaluated by comparing the results it provided to the results provided by a user-involved method, Think Aloud. Heuristic Evaluation’s performance in detecting usability problems of a system was evaluated in two cases: taking all of the usability problems of the interface into account and only taking the serious usability problems of the interface into account. A system called Nytt, provided by Nytt Ab, was used as the evaluated system. The values of thoroughness, validity and effectiveness were calculated based on the numbers of actual usability problems found via Heuristic Evaluation, actual problems missed by Heuristic Evaluation and false problems found via Heuristic Evaluation. The findings of this study suggest that Heuristic Evaluation does not detect all of the problems that Think Aloud does but instead offers a lot of other findings as problems. Moreover, the performance of Heuristic Evaluation is not drastically affected by whether detecting only serious usability problems or usability problems in general.
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Parihar, Naveen. "Performance analysis of advanced front ends on the Aurora Large Vocabulary Evaluation." Master's thesis, Mississippi State : Mississippi State University, 2003. http://library.msstate.edu/etd/show.asp?etd=etd-11042003-101837.
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Malik, Yasir. "Towards Evaluation of Pervasive Computing System." Thèse, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/6020.
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Résumé : L’informatique diffuse est le passage du paradigme informatique vers l’informatique partout. L’émergence couvre principalement l’informatique mobile et distribuée, les réseaux de capteurs, l’interaction homme-machine et l’intelligence artificielle sous l’égide de l’informatique diffuse. Des efforts considérables ont été mis sur les recherches dans ce domaine, mais il n’existe pas de normes ou des méthodologies communément acceptées pour évaluer ces systèmes et de définir des nouvelles orientations de recherche dans le futur. Cette thèse s’attaque au problème
d’évaluation des systèmes informatiques ubiquitaires. La question de recherche
notamment le quoi et comment évaluer n’a pas encore été résolue. Dans l’objectif
de trouver une réponse à cette question et d’élaborer un cadre général d’évaluation,
nous avons procédé comme suit. Pour répondre à la première partie de la question, “Quoi évaluer”, nous avons tout d’abord classè les systèmes en se basant sur certains critères, et nous avons défini ensuite les principaux paramètres pour évaluer ces systèmes. Pour ce faire, nous avons étudié différents aspects de l’informatique diffuse et nous les avons classés en onze différents aspects d’évaluation. Pour chaque aspect, nous avons identifiè les principaux paramètres qui peuvent être caractérisés et mesurés. Cette taxonomie n’est pas assez exhaustive, mais elle reflète le schéma de classification le mieux adaptè pour des évaluations effectives. Cependant, pour que l’évaluation soit la plus complète possible, nous avons jugé nécessaire d’incorporer l’utilisateur dans le processus d’évaluation. À cet effet, nous avons proposè un modèle d’évaluation qui prend en compte les besoins de l’utilisateur, le contexte dans lequel la technologie sera utilisée, et l’environnement d’exploitation dans lequel le système va être déployé. Le modèle proposè constitue une première étape vers le développement des directives et standards d’évaluation qui peuvent être utilisés peuvent être utilisées pendant les évaluations formatives et sommatives. Une autre question complémentaire à l’évaluation des performances est la validation fonctionnelle d’un système en cours d’exécution, qui confirme que le système est conforme aux exigences fonctionnelles et ne contient pas de failles. Pour répondre à la deuxième partie de la question à savoir “comment évaluer”, nous avons adoptè les techniques formelles de vérification et de validation. Comme le champ d’application du projet est très large, nous sommes concentrés sur l’évaluation au premier stade de la conception afin de vérifier et de valider l’exactitude fonctionnelle de la conception de systèmes. Pour la preuve de concept, nous avons appliqué deux méthodes, dans la première méthode, nous avons étudié les approches de vérification automatique et nous avons choisi la technique la plus connue qu’est le “model checking” pour vérifier les exigences fonctionnelles d’un système de gestion des médicaments basé sur le contexte pour des
personnes âgées dans une maison Intelligente. Cette approche est complémentaire
aux tests et à l’évaluation et permet aux concepteurs de vérifier le comportement
de leurs systèmes par rapport aux exigences fonctionnelles avant le développement
du prototype de système. Certaines propriétés de base, telles que la disponibilité
ou la vivacité, l’interblocage, la comparaison des spécifications et implémentations et
l’analyse d’accessibilité, sont également vérifiées à ce stade.
Dans la deuxième méthode, nous avons étudié les approches de vérification
d’exécution et nous avons adoptè la technique de conception par le contrat pour
modéliser et vérifier la sémantique et exigences de l’interopérabilité des services
dans les environnements intelligents. L’avantage de cette approche réside dans la
vérification automatique en temps réel de l’interopérabilité des services dans les
environnements intelligents. // Abstract : Summary performance evaluations. The proposed model is a step towards forming standard evaluation guidelines that can be used during formative and summative evaluations. A complementary issue to performance evaluation is functional correctness of a running system, which confirms that the system fulfills its functional requirements and does not contain any flaws. To address the second part of the question that is “ how to evaluate ”, we have adopted the well-known formal verification and validation techniques. As the scope of the project is very big, the focus of this thesis is on early design stage evaluation to verify and validate the functional correctness of the systems design. For the proof-of-concept, we applied two methods: In the first method, we studied automatic verification approaches and used a well-known model checking approach to model and verify the functional requirements of a context aware medication management system for the elderly in a Smart House. This approach is complementary to testing and evaluation, it allows designers to verify their system behavior against its functional requirements before developing the system prototype. Some basic properties like the availability or liveliness, deadlock checking, matching of specification and implementation, and reachability analysis are verified. In the second method, we studied the runtime verification approaches and used design by contract technique to model and verify the semantic and pragmatic service interoperability requirements in smart environments. The analysis of this technique and results are presented. The benefit of the approach is automatic verification of services interoperability in smart environments on the fly.
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Shupp, Lauren Marcy. "The Effects of Curving Large, High-Resolution Displays on User Performance." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/34294.
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Tiling multiple monitors to increase the amount of screen space has become an area of great interest to researchers. While previous research has shown user performance benefits when tiling multiple monitors, little research has analyzed whether much larger high-resolution displays result in better user performance. The work in this paper evaluates user performance on an even larger, twenty-four monitor, high-resolution (96 DPI), high pixel-count (approximately 32 million pixels) display for single-users in both flat and curved forms. The first experiment compares user performance time, accuracy, and mental workload on multi-scale geospatial search, route tracing, and comparison tasks across one, twelve (4x3), and twenty-four (8x3) tiled monitor configurations. Using the same tasks, we evaluated conditions that uniformly curve the twelve and twenty-four monitor displays. Results show that, depending on the task, larger viewport sizes improve performance time with less user frustration. Findings also reveal that curving large displays improves performance time as users interacted with less strenuous physical navigation on the curved conditions.
A second study sought to understand why curving the display, effectively bringing all pixels into visible range, improved performance so as to provide guidelines for using such large displays. The study tested for region biases, performance gaps in comparing virtually distant objects, and degree of detail of user insights while measuring the physical navigation required. Results clearly show that significantly less movement is required when physically navigating the curved display. Performance measures reveal that users favor the left regions of the flat display, while there appears to be no region bias on the curved display. Furthermore, user performance time increased as the virtual distance between objects increased, and there is a tradeoff in insight detail between the two forms. In conclusion, larger, high-resolution displays improve user performance, and curving such displays further improves performance, removing any biases towards regions of the display, potentially reducing the performance drop of virtually far apart objects, reducing the amount of physical navigation necessary, and enabling more detailed insights. Based on these findings, one should always curve multiple monitor displays for single users, and if space is an issue, start curving once the display reaches four or five monitors wide.Master of Science
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Hoßfeld, Tobias [Verfasser]. "Performance evaluation of future internet applications and emerging user behavior / vorgelegt von Tobias Hoßfeld." Würzburg : Inst. für Informatik, Lehrstuhl für Verteilte Systeme, 2009. http://d-nb.info/999915495/34.
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Culhane, Andrew Alan. "Development of an Obstacle Detection System for Human Supervisory Control of a UAV in Urban Environments." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/36082.
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In order to operate UAVs under human supervisory control in more complex arenas such as urban environments, an obstacle detection system is a requirement to achieve safe navigation. The development of a system capable of meeting these requirements is presented. The first stage of development was sensor selection and initial testing. After this, the sensor was combined with a servomotor to allow it to rotate and provide obstacle detection coverage in front, below, and to both sides of the UAV. Utilizing a PC-104 single board computer running LabView Real-time for on-board control of the sensor and servomotor, a stand alone obstacle detection system was developed meeting the requirements of light weight, low power, and small size. The detection performance of the system for several parameters has been fully characterized. A human subjects study was conducted to assess the any advantages resulting from the addition of the obstacle detection system compared to that of a normal nadir camera. The study demonstrated that users with access to the three-dimensional display were able to navigate an obstacle course with greater success than those with only a camera. Additional development into more advanced visualization of the environment has potential to increase effectiveness of this obstacle detection system.Master of Science
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Klomparens, Dylan. "Automated Landing Site Evaluation for Semi-Autonomous Unmanned Aerial Vehicles." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/34641.
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A system is described for identifying obstacle-free landing sites for a vertical-takeoff-and-landing (VTOL) semi-autonomous unmanned aerial vehicle (UAV) from point cloud data obtained from a stereo vision system. The relatively inexpensive, commercially available Bumblebee stereo vision camera was selected for this study. A â point cloud viewerâ computer program was written to analyze point cloud data obtained from 2D images transmitted from the UAV to a remote ground station. The program divides the point cloud data into segments, identifies the best-fit plane through the data for each segment, and performs an independent analysis on each segment to assess the feasibility of landing in that area. The program also rapidly presents the stereo vision information and analysis to the remote mission supervisor who can make quick, reliable decisions about where to safely land the UAV. The features of the program and the methods used to identify suitable landing sites are presented in this thesis. Also presented are the results of a user study that compares the abilities of humans and computer-supported point cloud analysis in certain aspects of landing site assessment. The study demonstrates that the computer-supported evaluation of potential landing sites provides an immense benefit to the UAV supervisor.Master of Science
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Zabramski, Stanislaw. "Creating Digital Traces of Ideas : Evaluation of Computer Input Methods in Creative and Non-Creative Drawing." Doctoral thesis, Uppsala universitet, Människa-datorinteraktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-220882.
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Ideas are formed in a process of idea generation that includes creation, development, and communication of new ideas. Drawing has been used as a support for ideation for centuries. Today, computerized tools are commonly used for drawing. Such tools form a user interface between the human and the resulting drawing presented on the screen. The interface may come between the user and the drawing in a disruptive way also affecting the ideation process. Using controlled laboratory studies, this thesis investigates the consequences of drawing with different user interfaces in two types of tasks: creative drawing tasks (based on a standardized test of creativity) and non-creative drawing tasks (i.e. shape-tracing tasks where no new idea is created). The goal was to identify and evaluate the consequences of the several issues originating from the use of different input devices, the functionality of the graphical user interfaces, the formulation of the drawing task, and the user’s previous experience. The results showed that drawing tasks are oriented toward quality of outcomes and that higher input accuracy led to higher quality of outcomes of both creative and non-creative drawing tasks. This came with a trade-off between the quantity and quality. In ideation, less accurate input devices facilitated significantly more ideas but these were of lower quality. In non-creative tracing, higher speeds caused lower quality of outcomes. The users subjectively preferred higher accuracy, also when an inaccurate user interface offered an eraser function. However, using the eraser allowed avoiding reinterpretations of ideas and led to ideation strategies characterized by laborious drawing that negatively affected the quality and quantity of the ideas produced. For non-creative drawing, the more difficult the shapes were, the lower the tracing accuracy. In the thesis a new framework for interaction analysis is introduced that improves the theoretical and practical understanding of computerized drawing tasks and the phenomena resulting from different aspects of the user interface design of computerized drawing tools. This thesis demonstrates that the inaccuracy of computerized tools cannot only make our drawings less aesthetically pleasing but also negatively affect ideas that are created in the process.
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Samteladze, Nikolai. "Delta Encoding Based Methods to Reduce the Size of Smartphone Application Updates." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4573.
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In 2012 the two biggest smartphone application markets - the Google Play store and the Apple App Store - each had close to 700 thousand applications with approximately 2 billion downloads happening every month. The introduction of new features and correction of bugs and security vulnerabilities make it usual for mobile application developers to release new version of an application every month. Combined with the great smartphone popularity, it leads to approximately 400 PB annual traffic generated by app updates in the U.S. wireless networks alone. Being partially transmitted through cellular networks, mobile application updates traffic accounts to up to 20% of the annual cellular traffic in the U.S. This thesis presents delta encoding based techniques that significantly reduce update traffic by transferring only the changes (or patches) between two versions of an application. Such network bandwidth reduction enables savings for smartphone users, mobile operators, and data centers that serve app updates.
Two Android application update methods - called DELTA and DELTA++ - were developed, implemented, and evaluated. Both methods use delta encoding to transfer only the changes between application versions. DELTA++ improves on DELTA by exploiting the internal structure of APK packages, which are used to distribute Android applications. The APK file can be seen as a compressed archive of all the files contained in application. The DELTA++ algorithm unpackages APK and computes differences between decompressed application files, which allows it to produce much smaller patches. Our experimental results show that DELTA++ reduces app update size by 77% on average. DELTA++ patches are twice smaller than those produced by the Google Smart Application Update method, which is currently used in the Google Play store. This reduction has a trade-off - increased complexity of generated patches makes patch deployment process more sophisticated. Consequently, more time has to be spent to apply the received patch in smartphone. Such delay can be considered acceptable as application update is a delay-tolerant process and smartphone users do not need an update immediately after its release.
In order to estimate how much savings can be achieved with DELTA++, a study of Android smartphone users was conducted. The results show that if DELTA++ is used in Google Play instead of the Google Smart Application Update method, then 32 PB or 1.7% of annual traffic can be saved every year in cellular networks in the U.S. The Apple App Store currently does not use any method based on delta encoding to reduce application updates traffic. Usage of methods similar to DELTA++ in the App Store can further increase the savings up to the 12% of yearly cellular traffic in the U.S., which equals to more than $2 billion cost savings a year.
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Schlagkamp, Stephan Verfasser], Uwe [Akademischer Betreuer] Schwiegelshohn, and Andrei [Gutachter] [Tchernykh. "User-aware performance evaluation and optimization of parallel job schedulers / Stephan Schlagkamp ; Gutachter: Andrei Tchernykh ; Betreuer: Uwe Schwiegelshohn." Dortmund : Universitätsbibliothek Dortmund, 2017. http://d-nb.info/1139892584/34.
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Schlagkamp, Stephan [Verfasser], Uwe Akademischer Betreuer] Schwiegelshohn, and Andrei [Gutachter] [Tchernykh. "User-aware performance evaluation and optimization of parallel job schedulers / Stephan Schlagkamp ; Gutachter: Andrei Tchernykh ; Betreuer: Uwe Schwiegelshohn." Dortmund : Universitätsbibliothek Dortmund, 2017. http://d-nb.info/1139892584/34.
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Sandberg, Alexander. "A photovoltaic system performance Evaluation Software : For evaluation of ten unique PV-system configurations in the middle of Sweden." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-26606.
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This thesis contains the development of a software capable of evaluating the performance of ten unique photovoltaic (PV) systems located 10 kilometers outside of Västerås, Sweden. The ten systems have different configurations according to this list: Dual-axis tracking Single-axis tracking with 30°tilt Ground mounted, free-standing with 19° tilt Ground mounted, free-standing with 41° tilt Roof mounted with 19°tilt Each of the above configurations exist with and without installed power optimizers adding up to a total of ten unique systems. The development goal for the evaluation software is to provide the user with a variety of tools to determine which of the systems that has the best yield and performance. Integrated in the development of the software is therefore a literature study where it is investigate how photovoltaic systems operate and especially how their performance can be evaluated. Some of the frequently used parameters are; system yield, reference yield and performance ratio. The software features are focused around presenting the data collected from the PV systems in a variety of graphs. The different types of graph are designed to let the user easy compare the data between the systems and thus find how and why a particular system is performing better than the others. The software is developed in a Matlab environment and has an intuitive user interface. The thesis time-frame is too short for any conclusive result to be presented, but to showcase the software features a short-termed evaluation of the systems have been performed. The period evaluated is a three week period in the middle of May 2014. The short-termed evaluation highlights several scenarios and issues that can arise. It has been detected throughout the project that it is difficult to separate which effects that causes one system to be better than the other. Irregularities seen in the data can be caused by many factors. Some of the more evident are; installed power optimizers, differences in system configurations and shadow patterns. By using the software effects like array shading and inaccurate measurements has been discovered.Evaluation of first MW PV plant in Sweden
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Tate, Calandra Rilette. "An investigation of the relationship between automated machine translation evaluation metrics and user performance on an information extraction task." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7777.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.Thesis research directed by: Applied Mathematics Program . Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Brunelli, Lorenzo. "Design of a user-friendly Plug-in HEV simulation platform for energy management strategies and e-Horizon functions performance evaluation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17209/.
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Il lavoro di tesi si focalizza sull'analisi di funzioni predittive di gestione dell'energia a bordo implementate in veicoli ibridi plug-in. Le funzioni si basano sulla presenza a bordo di sensori ADAS e sulla conoscenza a priori del percorso. Creazione di una Graphic User Interface per semplificare l'inizializzazione di simulazioni compliant con le più recenti normative in termini di emissioni.
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Sinyenyeko-Sayo, Nondumiso Constance. "Improving library services through the application of business performance concepts." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_4120_1188477680.
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In virtually any field of endeavour today, access to information is a prerequisite for success. Libraries form the repositories with user-friendliness their mission. This has lead to the need for new ways to evaluate library performance. Astute library managers will plan for such developments, taking into account current and future trends that impact on library services. Library services are also affected, for example, by financial considerations and staffing problems. Further complicating matters are the demands of their clients who have developed increased expectations of improved service, and also a desire for more self-service opportunities. Such changes raise the question: &ldquo
to what extent can libraries apply business performance management techniques to assess their performance.&rdquo
This, then, is the research question for this study.
This work will evaluate library performance with the aim of improving service management. Its targets are the UWC library, and others, such as the Stellenbosch University, and the Cape Peninsula University of Technology. The application of selected service management techniques and measures used in business will be explored. These techniques include The Balanced Scorecard, critical success factors and service quality. The study also touches on transformation and change management. An obvious source of information about library management is the corps of managers. The secondary source of information is the community of library users.
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Mahammad, Sarfaraz Ahmad, and Vendrapu Sushma. "Raspberry Pi Based Vision System for Foreign Object Debris (FOD) Detection." Thesis, Blekinge Tekniska Högskola, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-20198.
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Background: The main purpose of this research is to design and develop a cost-effective system for detection of Foreign Object Debris (FOD), dedicated to airports. FOD detection has been a significant problem at airports as it can cause damage to aircraft. Developing such a device to detect FOD may require complicated hardware and software structures. The proposed solution is based on a computer vision system, which comprises of flexible off the shelf components such as a Raspberry Pi and Camera Module, allowing the simplistic and efficient way to detect FOD. Methods: The solution to this research is achieved through User-centered design, which implies to design a system solution suitably and efficiently. The system solution specifications, objectives and limitations are derived from this User-centered design. The possible technologies are concluded from the required functionalities and constraints to obtain a real-time efficient FOD detection system. Results: The results are obtained using background subtraction for FOD detection and implementation of SSD (single-shot multi-box detector) model for FOD classification. The performance evaluation of the system is analysed by testing the system to detect FOD of different size for different distances. The web design is also implemented to notify the user in real-time when there is an occurrence of FOD. Conclusions: We concluded that the background subtraction and SSD model are the most suitable algorithms for the solution design with Raspberry Pi to detect FOD in a real-time system. The system performs in real-time, giving the efficiency of 84% for detecting medium-sized FOD such as persons at a distance of 75 meters and 72% efficiency for detecting large-sized FOD such as cars at a distance of 125 meters, and the average frame per second (fps) that is the system ’s performance in recording and processing frames of the area required to detect FOD is 0.95.
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Salomaa, Josefin. "Evaluating JavaScript Frameworks." Thesis, Linnéuniversitetet, Institutionen för datavetenskap och medieteknik (DM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-97785.
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Web application frameworks have become a common part of software development, with each programming language having its own specific frameworks. However, choosing the right framework can be a daunting task when there are so many frameworks on the market and factors to consider. Previous research has attempted to solve this problem by evaluating frameworks based on several different metrics. While the results offer a way to rank the frameworks, they do not tell us much about the actual process of evaluating a framework, or why certain metrics matter and in what situation. This project aimed to answer these questions by conducting a literature review to gather information about the existing evaluation methods and metrics. Based on these results, an evaluation criteria was developed to provide an overview of when to evaluate what. Furthermore, a user survey was done to measure the usability of three popular JavaScript frameworks. Lastly, a controlled experiment was conducted to test the performance of the three frameworks. The results show that different frameworks have different strengths and weaknesses as they received different scores from the methods. Moreover, the results show that when choosing a framework, one has to consider which factors matter most as it may not always be possible to find a framework that has it all.
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Wonjiga, Amir Teshome. "User-centric security monitoring in cloud environments." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S080.
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Les fournisseurs de services reconnaissent le problème de confiance et fournissent une garantie par le biais d'un contrat appelé Service Level Agreement (SLA). Presque tous les SLAs existants ne traitent que des fonctionnalités du nuage informatique et ne garantissent donc pas l'aspect sécurité des services hébergés pour les locataires. Comme le nuage informatique continue d'être de plus en plus intégré, il est nécessaire d'avoir des services de supervision de la sécurité propres a l'utilisateur, qui sont fondés sur les exigences des locataires. Cet aspect de supervision de la sécurité du système exige également que les fournisseurs offrent des garanties. Dans cette thèse, nous contribuons à l'inclusion de termes de supervision de la sécurité centres sur l'utilisateur dans les SLAs de l'informatique en nuage. Nous concevons des extensions à un langage de SLA existant appelé Cloud SLA (CSLA). Notre extension, appelée Extended CSLA (ECSLA), permet aux locataires de décrire leurs besoins en matière de supervision de la sécurité en termes de vulnérabilités. Plus précisément, un service de supervision de la sécurité est décrit comme une relation entre les besoins de l'utilisateur en tant que vulnérabilités, un produit logiciel présentant ces vulnérabilités et une infrastructure où le logiciel est exécuté. Nous proposons une solution pour réduire le nombre d’évaluations nécessaires par rapport au nombre de configurations possibles. La solution proposée introduit deux nouvelles idées. Tout d'abord, nous concevons une méthode de construction d'une base de connaissances qui repose sur des regroupements de vulnérabilités a partir d'heuristiques. Deuxièmement, nous proposons un modèle pour quantifier l’interférence entre des règles de détection associées à des vulnérabilités différentes. En utilisant ces deux méthodes, nous pouvons estimer la performance d'un dispositif de supervision avec peu d’évaluations par rapport à une approche naïve. Les métriques utilisées dans nos termes de SLA tiennent compte de l'environnement opérationnel des dispositifs de supervision de la sécurité. Afin de tenir compte des paramètres imprévisibles de l'environnement opérationnel, nous proposons un mécanisme d'estimation ou la performance d'un dispositif de supervision est mesurée à l'aide de valeurs connues pour ces paramètres et le résultat est utilisé pour modéliser sa performance et l'estimer pour les valeurs inconnues de ces paramètres. Une définition de SLA contient le modèle, qui peut être utilisé chaque fois que la mesure est effectuée. Nous proposons une méthode d’évaluation in situ de la configuration d'un dispositif de supervision de sécurité. Elle permet de vérifier la performance d'une configuration de l'infrastructure de supervision de sécurité dans un environnement de production. La méthode utilise une technique d'injection d'attaques mais les attaques injectées n'affectent pas les machines virtuelles de production. Nous avons mis en œuvre et évalué la méthode de vérification proposée. La méthode peut être utilisée par l'une ou l'autre des parties pour calculer la métrique requise. Cependant, elle exige une coopération entre les locataires et les fournisseurs de service. Afin de réduire la dépendance entre eux lors de la vérification, nous proposons d'utiliser un composant logique sécurisé. L'utilisation proposée d'un composant logique sécurisé pour la vérification est illustrée dans un SLA portant sur l’intégrité des données dans les nuages informatiques. La méthode utilise un registre sécurisé, fiable et distribué pour stocker les preuves de l’intégrité des données. La méthode permet de vérifier l’intégrité des données sans se fier à l'autre partie. S'il y a un conflit entre un locataire et un fournisseur, la preuve peut être utilisée pour résoudre ce conflitMigrating to the cloud results in losing full control of the physical infrastructure as the cloud service provider (CSP) is responsible for managing the infrastructure including its security. As this incites tenants to rely on CSPs for the security of their information system, it creates a trust issue. CSPs acknowledge the trust issue and provide a guarantee through Service Level Agreement (SLA). The agreement describes the provided service and penalties for the cases of violation. Almost all existing SLAs only address the functional features of the cloud and thus do not guarantee the security aspect of tenants’ hosted services. Security monitoring is the process of collecting and analyzing indicators of potential security threats, then triaging these threats by appropriate action. It is highly desirable for CSPs to provide user-specific security monitoring services which are based on the requirements of a tenant. In this thesis we present our contribution to include user-centric security monitoring terms into cloud SLAs. This requires performing different tasks in the cloud service life-cycle, starting before the actual service deployment until the end of the service. Our contributions are presented as follows : we design extensions to an existing SLA language called Cloud SLA (CSLA). Our extension, called Extended CSLA (ECSLA), allows tenants to describe their security monitoring requirements in terms of vulnerabilities. More precisely, a security monitoring service is described as a relation between user requirements as vulnerabilities, a software product having the vulnerabilities and an infrastructure where the software is running. To offer security monitoring SLAs, CSPs need to measure the performance of their security monitoring capability with different configurations. We propose a solution to reduces the required number of evaluations compared to the number of possible configurations. The proposed solution introduces two new ideas. First, we design a knowledge base building method which uses clustering to categorize a bunch of vulnerabilities together in groups using some heuristics. Second we propose a model to quantify the interference between operations of monitoring vulnerabilities. Using these two methods we can estimate the performance of a monitoring device with few numbers of evaluations compared to the naive approach. The metrics used in our SLA terms consider the operational environment of the security monitoring devices. In order to consider the non-determistic operational environment parameters, we propose an estimation mechanism where the performance of a monitoring device is measured using known parameters and the result is used to model its performance and estimate it for unknown values of that parameter. An SLA definition contains the model, which can be used whenever the measurement is performed. We propose an in situ evaluation method of the security monitoring configuration. It can evaluate the performance of a security monitoring setup in a production environment. The method uses an attack injection technique but injected attacks do not affect the production virtual machines. We have implemented and evaluated the proposed method. The method can be used by either of the parties to compute the required metric. However, the method requires cooperation between tenants and CSPs. In order to reduce the dependency between tenants and CSPs while performing verification, we propose to use a logical secure component. The proposed use of a logical secure component for verification is illustrated in an SLA addressing data integrity in clouds. The method uses a secure trusted and distributed ledger (blockchain) to store evidences of data integrity. The method allows checking data integrity without relying on the other party. If there is any conflict between tenants and CSPs the evidence can be used to resolve the conflict
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Do, David, and Daniel Ohlsson. "The impact of Task-Technology Fit on user performance within an Applicant Tracking Software : A qualitative study on the Bullhorn system." Thesis, Linnéuniversitetet, Institutionen för informatik (IK), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-76762.
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The possibilities that exist with today’s online environments are huge. Today more data than ever before is stored each day in different forms online, and it is steadily increasing. With increasing amounts of data in the online databases, the need for evaluation and optimization in information systems is ever increasing. The field studies within this project was done on demand by a recruitment agency located in Great Britain. The main area of this study was to investigate the user experience and workflow within an applicant tracking software (ATS). With the Task-Technology Fit (TTF) theory as theoretical framework, this study aimed to apply this theory in the evaluation of the ATS called Bullhorn, by evaluating the match between Task characteristic and Technology characteristic through qualitative methods. Results shows how user experience and performance is affected by the current TTF construct.Möjligheterna i dagens onlinevärld är oändliga. Idag samlas det varje dag in mer data än någonsin innan i olika former online, och detta fortsätter att öka stadigt. Med ökande mängder data i databaserna online, ökar behovet av utvärdering och optimering inom informationssystem. Fältstudierna som genomfördes i detta projekt gjordes på beställning av ett rekryteringsbolag i Storbritannien. Huvudområdet för detta projekt var att undersöka användarupplevelsen och arbetsflödet i en söktjänst för arbetssökande. Med Task-Technology Fit-teorin (TTF) som teoretiskt ramverk var målet med denna studie att applicera denna teori i utvärderingen av söktjänsten Bullhorn, genom att utvärdera matchningen mellan uppgifterna som användarna behöver genomföra och tjänstens tekniska möjligheter via kvalitativa metoder. Resultatet visar hur användarupplevelsen och användarens prestation påverkas av den nuvarande TTF-matchningen.
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Farhadi-Niaki, Farzin. "Usability Analysis in Locomotion Interface for Human Computer Interaction System Design." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/38670.
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In the past decade and more than any time before, new technologies have been broadly applied in various fields of interaction between human and machine. Despite many functionality studies, yet, how such technologies should be evaluated within the context of human computer interaction research remains unclear. This research aims at proposing a mechanism to evaluate/predict the design of user interfaces with their interacting components. At the first level of analysis, an original concept extracts the usability results of components, such as effectiveness, efficiency, adjusted satisfaction, and overall acceptability, for comparison in the fields of interest. At the second level of analysis, another original concept defines new metrics based on the level of complexity in interactions between input modality and feedback of performing a task, in the field of classical solid mechanics. Having these results, a set of hypotheses is provided to test if some common satisfaction criteria can be predicted from their correlations with the components of performance, complexity, and overall acceptability. In the context of this research, three multimodal applications are implemented and experimentally tested to study the quality of interactions through the proposed hypotheses: a) full-body gestures vs. mouse/keyboard, in a Box game; b) arm/hand gestures vs. three-dimensional haptic controller, in a Slingshot game; and c) hand/finger gestures vs. mouse/keyboard, in a Race game. Their graphical user interfaces are designed to cover some extents of static/dynamic gestures, pulse/continuous touch-based controls, and discrete/analog tasks measured. They are quantified based on a new definition termed index of complexity which represents a concept of effort in the domain of locomotion interaction. Single/compound devices are also defined and studied to evaluate the effect of user’s attention in multi-tasking interactions. The proposed method of investigation for usability is meant to assist human-computer interface developers to reach a proper overall acceptability, performance, and effort-based analyses prior to their final user interface design.
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Ecarot, Thibaud. "Efficient allocation for distributed and connected Cloud." Thesis, Evry, Institut national des télécommunications, 2016. http://www.theses.fr/2016TELE0017/document.
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Dans ce travail, nous nous intéressons à la modélisation des ressources Cloud, indépendamment des couches existantes, afin d’apporter un cadre (framework) de représentation unique et ouvert à l'arrivée anticipée du XaaS (Anything as a Service). Nous fournissons, à l'aide de ce framework, un outil de placement des ressources pour une plate-forme donnée. Les travaux de thèse se portent aussi sur la prise en compte des intérêts des utilisateurs ou consommateurs et des fournisseurs. Les solutions existantes ne se focalisent que sur l’intérêt des fournisseurs et ce au détriment des consommateurs contraints par le modèle d’affaire des fournisseurs. La thèse propose des algorithmes évolutionnaires en mesure de répondre à cet objectifThis thesis focuses on optimal and suboptimal allocation of cloud resources from infrastructure providers taking into account both the users or consumers and the providers interests in the mathematical modeling of this joint optimization problem. Compared to the state of the art that has so far remained provider centric, our algorithms optimize the dynamic allocation of cloud resources while taking into account the users and the providers objectives and requirements and consequently frees the users (or consumers) from provider lock in (providers’ business interests). Evolutionary algorithms are proposed to address this challenge and compared to the state of the art
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Friedlander, Naomi Lynn. "Evaluating user performance in nonvisual bullseye menus." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29239.pdf.
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Mapoka, Trust Tshepo. "Location based authenticated multi-services group key management for cyber security in high speed broadband wireless multicast communications : multi-service group key management scheme with location based handover authentication for multi-handoffs participating in multi-group service subscriptions, its performance evaluation and security correctness in high speed broadband wireless multicast communications." Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/14468.
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Secure information exchanges over cyberspace is on the increase due to the convergence of wireless and mobile access technologies in all businesses. Accordingly, with the proliferation of diverse multicast group service subscriptions that are possible to co-exist within a single broadband network, there is also huge demand by the mobile subscribers to ubiquitously access these services over high speed broadband using their portable devices. Likewise, the Network Providers (NPs) invest hugely in infrastructure deployment to disseminate these services efficiently and concomitantly. Therefore, cyber security in any business is obligatory to restrict access of disseminated services to only authorised personnel. This becomes a vital requirement for a successful commercialisation of exchanged group services. The standard way to achieve cyber security in a wireless mobile multicast communication environment is through confidentiality using Group Key Management (GKM).The existing GKM schemes for secure wireless multicast from literature only target single group service confidentiality; however, the adoption of multiple group service confidentiality in them involve inefficient management of keys that induce huge performance overheads unbearable for real time computing. Therefore, a novel authenticated GKM scheme for multiple multicast group subscriptions known as slot based multiple group key management (SMGKM) is proposed. In the SMGKM, the handovers move across diverse decentralised clusters of homogeneous or heterogeneous wireless access network technologies while participating in multiple group service subscriptions. Unlike the conventional art, the SMGKM advances its security by integrating location based authentication and GKM functions. Both functions are securely offloaded from the Domain Key Distributor (DKD) to the intermediate cluster controllers, Area Key Distributors (AKDs), in a distributed fashion, using the proposed location based authenticated membership list (SKDL). A significant upgrade of fast handoff performance with reduced performance overheads of the SMGKM scheme is achieved. The developed numerical analysis and the simulation results display significant resource economy in terms of reduced rekeying transmission, communication bandwidth and storage overheads while providing enhanced security. The performance of the SMGKM in a high speed environment is also evaluated and has demonstrated that SMGKM outperforms the previous work. Finally, the SMGKM correctness against various attacks is verified using BAN logic, the eminent tool for analysing the widely deployed security protocols. The security analysis demonstrates that SMGKM can counteract the security flaws and redundancies identified in the chosen related art.
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Sauer, Brian C. "Medication use performance indicator evaluation a systems perspective /." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0006469.
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Thesis (Ph.D.)--University of Florida, 2004.Typescript. Title from title page of source document. Document formatted into pages; contains 172 pages. Includes Vita. Includes bibliographical references.
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Van, Heerden Petrus Marthinus Stephanus. "Estimating efficiency of a South African bank using data envelopment analysis / by P.M.S. van Heerden." Thesis, North-West University, 2007. http://hdl.handle.net/10394/1854.
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The greater competition and concentration in South Africa's financial sector has put South African banks under more constraints and led to questioning of their present performance. With a greater demand for financial services and more complains about the low quality of financial services and charges being too high, there has been increasing debate about how efficient South African banks really are.
This study discusses performance evaluation, the traditional financial and non-financial measures used, and their limitations. The concept of bank efficiency is also briefly discussed, including scale efficiency, scope efficiency, X-efficiency, cost efficiency, standard profit efficiency, alternative profit efficiency and the risk component of bank efficiency.
Data Envelopment Analysis (DEA) was chosen as the most appropriate method to estimate the scale efficiency and technical efficiency of 37 districts (and 10 provinces) of one of the largest banks in South Africa. 'DEA involves solving linear programming problems that generate a non-parametric, piecewise linear convex frontier that envelops the input and output data relative to which cost is minimized' (Fare et al., 1985b:193). The intermediation approach was used incorporating both the input- and output-orientated approach under variable returns to scale.
The analyses indicated that 19 districts out of the 37 districts were not at least once fully technically efficient during the 22 months (input- and output-orientated). The same results were found with regard to scale efficiency: 17 districts out of the 37 districts were not at least once fully scale efficient (input-orientated) and 19 districts out of the 37 districts were not at least once fully scale efficient (output-orientated), during the 22 months. Synergy was found in 6 provinces out of the 10 provinces (input- and output-orientated).Thesis (M.Com. (Risk Management))--North-West University, Potchefstroom Campus, 2008.
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Climaco, Carmo. "The use of performance indicators in school self-evaluation." Thesis, Cranfield University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260439.
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Laeeq, Muhammad Nadeem. "Performance evaluation of dryer units used in diesel emission measurement systems." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4208.
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Thesis (M.S.)--West Virginia University, 2005.Title from document title page. Document formatted into pages; contains viii, 82 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 79-82).
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Shrestha, Som Sagar. "Performance evaluation of carbon-dioxide sensors used in building HVAC applications." [Ames, Iowa : Iowa State University], 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3379185.
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Hagernäs, Patrik. "5G user satisfaction enabled by FASP : Evaluating the performance of Aspera's FASP." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172760.
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With Ericsson’s goal to have optimal user experience at 5G’s 2020 release, it is very important to optimize transport protocols and techniques to manage the increasing amount of data traffic. Additionally, it will be important to manage handovers between very high speed 5G networks and older networks. Today most of the traffic is video on demand and the amount of this kind of traffic is expected to increase. Moreover, the current amount of data traffic will increase by an order of magnitude over the next few years. This thesis focuses on radio access networks and the difficulties they face in delivering high speed data traffic. This thesis analyzes one of the most used TCP protocols, CUBIC, as well as a new transport protocol developed by Aspera, called the Fast and Secure Protocol. Aspera’s FASP is a new transport protocol that promises full link utilization. FASP is built upon UDP and uses advanced round trip time measurements and queuing delay to detect the available bandwidth between two communicating hosts. This thesis project also provides methods to realize experiments to assess the limitations of transport protocols. These experiments are conducted in an environment that resembles the upcoming 5G radio access network. Results have shown that both delay and packet loss affect TCP more than we expected and that high packet loss is devastating. In contrast, Aspera’s FASP is very resistant to both delay and packet loss. These results and analysis provide a foundation upon which others can build.Med Ericssons mål att ha optimal användarupplevelse vid släppet av 5G år 2020 är det oerhört viktigt att optimera transportprotokoll och tekniker för att hantera den ökande mängden datatrafik. En annan viktig aspekt kan vara att hantera överlämningar mellan 5G nätverk och äldre radionätverk. Idag är den största trafiken streamad video och prognoser visar att den sortens trafik bara kommer att öka. Prognoserna visar också att all trafik kommer att öka mångfaldigt de närmaste åren. Denna thesis kommer att fokusera på svårigheterna just inom radionätverk. Denna thesis kommer att analysera ett av vårt mest använda transportprotokoll CUBIC TCP, den kommer också att analysera ett helt nytt transportprotokoll utvecklat av Aspera, Fast and Secure Protocol. Aspera lovar fullt utnyttjande av den mellanliggande länken. FASP är byggt ovanpå UDP och använder avancerade tur- och returtidsmätningar för att använda all outnyttjad bandbredd. Denna thesis visar även hur man kan göra experiment för att hitta begränsningar i transportprotokoll. Alla dessa experiment kommer utförs i en miljö som efterliknar det nya 5G-nätverket. Resultatet visar att både förlora paket tillsammans med en hög fördröjning påverkar mycket mer än väntat och att frekvent förlora paket är förödande för TCP. Asperas FASP är i motsats mycket tålig mot både paketförlust och hög fördröjning. Detta resultat och denna analys lägger en grund var andra kan arbeta vidare.
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Wassing, Daniel. "Evaluation of Terminology servers for use with SNOMED CT." Thesis, Linköpings universitet, Interaktiva och kognitiva system, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170792.
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Today, electronic healthcare still suffers from a lack of unified semantics and classifications of patient data. Electronic health records may not be properly processed across the globe, and if they are, data is often lost upon conversion. A way to tackle this problem is with proper data classification using terminologies and by using terminology servers, which map between terminologies. In this thesis the focus lies on evaluating a set of open source terminology servers on their qualities with respect to usability and performance. We evaluate them by finding out how we can use and work with the SNOMED CT terminology through the servers. This thesis uses a heuristic evaluation where it measures a set of criteria based on defined properties of the servers and artifacts related to them. This way, a candidate server for integration with COSMIC, a software solution by CAMBIO for the electronic healthcare system which aims to conform to the idea of a global electronic health record standard, is found.
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Lafeuillee, Cosmos Auvington. "The use and management of performance evaluation in some British universities." Thesis, University College London (University of London), 2003. http://discovery.ucl.ac.uk/10020440/.
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Mkovane, Zenephone Bhekuyise. "Critical analysis of a performance management system used by a tertiary education institution in the Eastern Cape." Thesis, Nelson Mandela Metropolitan University, 2005. http://hdl.handle.net/10948/412.
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As argued by authors like Franzen on whose work the greater part of the introduction, the main problem and sub-problem has been based, the objective of this study was to establish the extent to which the performance evaluation system currently in use at the subject Institution conforms to the benchmark performance management systems as espoused in literature. Further, the objective was to establish the differences and commonalities between the performance management systems practiced in the corporate sector and current practice at the subject Institution. Best practice was thus lifted to form part of the recommendation of this study. A questionaire was designed based on the guidelines in the literature study in order to determine how the subject Institution conducts its performance appraisal and how this relates to the four general purposes of performance management mentioned in the study. The respondents' opinion obtained from the questionaire were compared with the guidelines in literature and clustered around the four identifiable general purposes of performance management. The study concludes with a statement of current practice at the subject Institution, and outlines the extent of conformance to benchmark practice on performance management systems. Recommendations are made based on best practice and direction is given to future research into contemporary practices with the express aim of enhancing quality in higher education applying the quality-related procedures of industry and commerce, where quality is crucial to success (Winch, 1996: 9-13). The current performance management system at the subject Institution proves to be largely conforming to the benchmark. However it should require comments made by the respondents that pertain to improvement.
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Willemsen, Mattias. "Evaluating player performance and usability of graphical FPS interfaces in VR." Thesis, Blekinge Tekniska Högskola, Institutionen för datavetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18413.
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Background. When designing video games for Virtual Reality, graphical user interfaces (GUIs) cannot always be designed as they have been for traditional video games. An often recommended approach is to merge the interface with the game world, but it is unclear if this is the best idea in all cases. As the market for Virtual Reality is growing quickly, more research is needed to create an understanding of how GUIs should be designed for Virtual Reality. Objectives. The thesis researches existing GUI type classifications and adapts them for VR. A method to compare the GUI types to each other is selected and conclusions are drawn about how they affect player performance, usability, and preference. Methods. A VR FPS game is developed and an experiment is designed using it. The experiment tests the player's performance with each of three distinct GUI types and also presents questionnaires to get their personal preference. Results. Both player performance and subjective opinion seems to favour geometric GUI. Conclusions. The often recommended approach for designing GUI elements as part of the game world may not always be the best option, as it may sacrifice usability and performance for immersion.Bakgrund. Vid design av grafiska användargränssnitt (GUI) till Virtual Reality kan inte alltid samma design användas som tidigare har använts i traditionella TV-spel. Ett tillvägagångssätt som ofta rekommenderas är att göra spelets GUI en del av spelvärlden men det är oklart om det är den bästa strategin när man väger in prestation, användbarhet, och preferens. Eftersom marknaden för Virtual Reality växer snabbt behövs mer forskning för att få en förståelse för hur grafiska användargränssnitt bör designas. Syfte. Detta examensarbete undersöker existerande klassifikationer av GUI:n och anpassar dem för VR. En metod för att jämföra de olika typerna av GUI väljs ut och slutsatser dras om hur de påverkar prestanda, användbarhet och preferens. Metod. Ett VR FPS-spel utvecklas och ett experiment designas baserat på det. Experimentet testar spelares prestanda med tre olika typer av GUI. Spelarna svarar även på enkäter om upplevd användbarhet och preferens. Resultat. Data från både prestanda och personlig preferens verkar förespråka Geometriskt GUI. Slutsatser. Metoden som ofta rekommenderas där spelets GUI arbetas in som en del av spelvärlden verkar inte alltid vara det bästa valet då det kan offra användbarhet och prestanda för inlevelse.
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Solomons, Neville. "A critical evaluation of the performance management system used by Nampak Research and Development." Thesis, Nelson Mandela Metropolitan University, 2006. http://hdl.handle.net/10948/610.
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Introduction: Performance management is an important driver in most companies today. Companies regard this as the tool to ensure that the people working for them will deliver as per the agreed contract and objectives which were set mutually. This study will reveal the importance of a well managed performance management system and what benefits one will derive from it. Intent: The purpose of this research project is to conduct a critical analysis of the performance management system used by Nampak Research and Development. They have been using a system since 2001 to the present without any changes to the system. The study focused on key areas to ascertain the level of change in the above respect that needs to take place. The study addressed (a) the understanding of performance management, (b) the management attitude towards performance management, (c) staff development, (d) the mentoring system, and (e) the performance appraisal method used. Findings: the main findings were that: (a) loss of management skill due to retirement, (b) staff has a negative attitude towards the performance management system, (c) staff does not trust the system, (d) management is the only group that is positive about the system, (e) there are no staff development strategies and no staff development, (f) ineffective mentoring system, (g) no mentor and mentee relationship, and (h) the performance appraisal method raised concerns in terms of departments not being consistent with the rating scores. Conclusion: the researcher has recommended what needs to be put in place to help the system work. Due to the complexity of the system, the researcher then recommended that a specialist in the field of performance management be approached to resolve the situation.
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Siddique, Samuel. "Cost Performance Measurements : Evaluation of Recent Models and Methodologies Used In Logistics Activities." Thesis, KTH, Industriell ekonomi och organisation (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-106576.
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Det är inte bara produkter och tjänster som konkurrerar med varandra, utan även försörjningskedjor i stor utsträckning. I ett företags omvärld sker det ständiga förändringar som sätter hög press på att kunna leverera produkter och tjänster i enlighet med evigt föränderliga marknader som företaget verkar inom. Nyttan av att se över sitt företag i termer av effektivitet kan i slutändan leda till att komperativa fördelar kan uppnås relativt konkurrenterna. Ett led i att uppnå effektivitet i marknaden och således skapa kundvärden är att se över sin försörjningskedja och utvärdera dess effektivitet i termer av komparativa fördelar. I sökandet efter den mest effektiva försörjningskedjan, erfordras det av företaget ha en rigid överblick över dess kedja, från produktion till slutkonsument. Men en sådan överblick bör även ske på andra gogrunder än effektivitet; utvärdering av försörjningskedjan bör i termer av effektivitet, även skapa en viss medvetenhet företagsledningar likväl. När vi talar om logistiken i företag kan man inte undgå att tänka på de kostnader som kan tänkas uppstå med de aktiviteter som inryms i en kedja. I strävan mot en mer effektivare försörjningskedja, kan det tänkas som sådant att kostnadseffektiviteten bör tänkas utgöra en vägledning till hur väl ett företag företar sig att skapa komparativa fördelar. I detta examensarbete har således kostnadseffektiva logistiska prestationsmätningar utvärderats gentemot gängse modeller och ramverk föreslaget av olika teorier. Resultat visar entydigt på att prestationsmätning av ett företags kostnader, logistiska kostnader det vill säga, bör innefattas av en rigid och strukturerad process där avsaknandet av mer detaljerade kostnader skapar [mycket] svaga prestationsmätningar till följd av detta. Propositionen om att information är en vägledande variabel, är inte helt utan fog; utan ett detaljerat kostnadsinformationsflöde, kan ett företag inte företa ta sig att skapa modeller och strukturer av prestationsmätningar rörandes kostnader i logistiken, enligt vad examensarbetet påvisar. Detta är eller kan vara till följd av att integration mellan olika aktörer i försörjningskedjan som exempelvis tredjepartlogistik och andra logistiska partners saknas och detta medför att man "håller inne" med detaljerade information som annars skulle kunna begagna och skapa 8 trovärdiga prestationsmätningar av kostnader. I fallet med Company AB, visar resultaten entydigt på att integration mellan aktörer i än mer omfattning än dagens uppsättning just på detta. Observera dock att detta inte bör vara fallet i andra företag, men just i Company AB var detta påtagligen. Vidare kan det hävdas, i enlighet med examensarbetets resultat att det ändock går att utföra prestationsmätning om än information saknas; med lite information tillshands kan man utföra prestationsmätning men då i en begränsad omfattning. För att komma i underfund med det ovannämnda problematik, har författaren till denna examenarbete utarbetat en modell ,"3-I" model. Anledningen till att sådant har utarbetats, är för att göra olika aktörer varse om att integration mellan ett företag och dess aktörer i en försöjningskedja kan komma att begagna alla involverade och skapa rigida prestationsmätningar som resultat i av detta. Om integration sker mellan olika aktörer, blir information om diverse tingest mer tillgänglig och detta medför skapandet av förbättrade prestationsmätningar, som i sin tur leder till effektivare försöjningskedjor och till slut förbättrade konkurrensfördelar för ett företag.In the ever-increasing competitiveness of the firm’s environment, it requires the adaptability of any one firm to be in par with the changing market forces. In order to do so, there is an eminent need of reviewing and revising both internal and external offerings of the firm in terms of products and services. As such, the need for competitive advantage in a market requires the need of widespread agreement regarding the aims and objectives of each activity of the firm. In doing so, there is a need of considering what and how to revise the organizational boundaries per se. One such area of consideration is the supply chain management. The search for excellence in supply chain management is of utter most concern for the typical firm. As such, there ought to be some stances of effective and efficient processes underlying the supply chain of the firm as such. In order to pursue and create an objective of efficient and effective supply chain, in order to create value-added and competitive advantage, it requires that measuring performance of either the entire supply chain of the firm or a specific, to create managerial awareness and subsequent competitive edge in the market. One such activity in particular concerns the activities of the firms logistic, in certain ways called physical distribution. In specific, the general concern of performance measures in logistics is believed to correlated to costs occurring alongside of such activity and the need of cost performance measurements and modeling of such. The case in this thesis comprises of an empirical study of Company AB. Company AB is one of the largest firm within its market in the fast moving consumer goods. As such, the logistics activities comprise not only a strategic midpoint of the firm, but also entail a competitive advantage over the competitors. The offerings of products and services that of Company AB is solemnly dependent of the logistics activities offered by the firm, as it aims to create superior customer satisfaction through the physical distribution of the products and the external services offered to the customers. The challenge for Company AB is not that it cannot create value for the firm and the customers, rather the challenge lies within the performance of the logistics activities, cost performance in particular. The costs occurring alongside the logistics activities chain cannot tell if the logistics activities, in a supply chain management context, are effective or efficient. 10 There are numerous tools [models] which could be applied and thus implemented regarding cost performance measurements. Analysis of Company AB in terms of evaluating and applying numerous models entails that the lack of information hinders for the notion of performing cost performance measurements as a result of such; the need of detailed and in some sense specific cost information in the initial stages of the process, is not only required but also imperative in order to perform [any] rigid cost performance measurements, the analysis concludes. Amidst the lack of detailed information, there can be some cost performance measurements if such occurs. With cost classification and categorization with simpler models, there can in fact be some stances of cost performance measurements. The latter steps in the pursuance of cost performance measuring, the analysis reveals that the integration of a BSC model in a supply chain management context proves to be of good performance measuring model regarding costs. When applying such model in Company AB , the analysis shows that the model not only is persistent in despite of lack of information, but could also be modified in order to create efficient measurement of cost of logistics. Also, the analysis shows that the SCOR model could increase the efficiency of cost performance modeling as well, if implemented [correctly] in the BSC model in an supply chain management model; the SCOR model is an process methodology which could be the exerted in the model when agreed upon objectives of cost performance measuring. The analysis rejects the idea of SCOR model being an model of cost performance measuring as it lacks the holistic view of an supply chain perspective. The result and conclusion nevertheless shows that lack of integration between supply chain actors could inherently increase the efficiency of any performance modeling, be it costs or other performance measurements. If integration is absent, this entails the fact that information for performance measuring ought to be vague as detailed information is needed, which were present it case of Company AB. A framework or model is thus presented, called the 3-I, as an recommendation and/or tool for overcoming the lack of information in the initial stages/processes in cost performance measuring, it is believed and argued.
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Coleman, William D. "Examining the relationship between performance measures and user evaluations in a transfer of training paradigm." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50055.
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User evaluations which generate detailed information can identify problematic aspects of software interfaces. In a preliminary study (Coleman, Wixon, and Williges, 1984), a methodology was developed for the systematic collection of detailed subjective evaluations of software interfaces. This methodology created a taxonomy of editing functions for users to evaluate and a set of bipolar scales on which they could make their evaluations. The present research investigated the utility of this methodology, while comparing two text editors within the context of a benchmark editing task. In addition, the detailed subjective measures collected were compared with more traditional objective measures.
The results of this research revealed that global subjective evaluations were insensitive to differences between two editors indicated by detailed evaluations. Examination of the detailed subjective evaluations indicated that the differences between editors could be 1 attributed to specific editing functions. The objective measures also indicated very specific differences between the two evaluated editors. Examination of the relationship between the objective and subjective measures indicated that the measures differed on both the magnitude and location of effects. Closer inspection of the data revealed that insensitivity on the part of the subjective measure could not account for all disagreement between measures. On several occasions the objective and subjective measures seemed to measure qualitatively different effects. Given that the measures were not completely redundant it was concluded that both objective and subjective measures should be collected during interface evaluation.Master of Science
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Capps, Patricia. "The use of Kirkpatrick's four levels of evaluation by performance improvement practitioners." [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3342991.
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Thesis (Ed.D.)--Indiana University, Dept. of Instructional Systems Technology, 2008.Title from home page (viewed on Jul 28, 2009). Source: Dissertation Abstracts International, Volume: 69-12, Section: A, page: 4693.
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Gillis, Andrew Nicholas. "Use of probabilistic methods in evaluating blast performance of structures." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66832.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 54-55).
The social and political climate of the modern world has lead to increased concern over the ability of engineered structures to resist blast events which may be incurred during terrorist attacks. While blast resistance design has been prominent for years in the industrial and military setting, it is starting to gain importance for structures which have been traditionally designed for aesthetics and which have high occupancy density. In these situations it is important that not only materials but the geometry of the building be optimized to reduce the effects of such an attack. However, designing a structure only for prescribed code requirements does not necessarily give a prediction of the post-blast behavior of the structure. Similar to the use of performance-based engineering for seismic events, the effects on a structure designed for blast loading should not be speculative but rather should exhibit expected behavior which is appropriate for the parameters of the given blast. Accounting for uncertainty of a potential blast event by assessing the structure in a probabilistic approach may lead to a more prudent and predictable assessment of damage and loss for the owner. The work herein attempts to provide an overview of the precedent of use of probabilistic methods in structural engineering, the current state of practice in blast engineering and set forth a framework and example by which probabilistic methods may be extended to blast considerations.
by Andrew Nicholas Gillis.
M.Eng.
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Hopkins, Paul Thomas. "Teacher perspectives of the use of student performance data in teacher evaluations." W&M ScholarWorks, 2013. https://scholarworks.wm.edu/etd/1539618729.
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The purpose of this study was to determine how K-12 public school teachers perceive the use of student performance data in teacher evaluations. The proprietary, utility, feasibility, and accuracy standards created by the Joint Committee on Standards for Education Evaluation (JCSEE) served as a framework for the study. An online survey was deployed to a random stratified sample of teachers across the United States. Participants responded to thirty statements using a four-point Likert Scale that ranged from Strongly Agree to Strongly Disagree. Participants were also provided an opportunity to list and describe additional items that they favored and feared with respect to using student performance data in teacher evaluations. Descriptive statistics and ANOVA were used to determine the level of teacher agreement on statements. Responses were further analyzed to determine the impact that the following demographic factors had on perceptions: (a) years of teaching experience, (b) teaching in a union and non-union states, (c) teaching a tested and non-tested grades and courses, and (d) teaching in elementary, middle, and high schools. Results indicated a strong level of agreement among teachers on the positive impact that the use of student performance data will have on improving teacher evaluations. Further results indicated that demographic factors played a minimal role in influencing participants' perceptions.
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Cortis, Natasha. "Challenging the "new accountability"? service users' perspectives on performance measurement in family support /." Connect to full text, 2006. http://hdl.handle.net/2123/1913.
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Doctor of Philosophy (PhD)After two decades of public management reform, the ‘new accountability’ of performance measurement is a routine feature in the relationships between Australian government agencies and the non-profit organisations they fund to provide child and family services. While performance measurement offers to resolve tensions about how governments manage the quality and productivity of contracted services, the indicators they commonly adopt raise well-documented practical, political and epistemological challenges in social services. Left unresolved, these challenges risk biasing representations of service performance, by emphasising the most tangible dimensions of service activities (such as measures of client throughput) over relationship building and care. Capturing only part of service activity compromises the usefulness of performance data for managing quality and outcomes, and denies policy makers critical information about the value and meaning of care in users’ lives. This thesis identifies and critically explores one set of challenges for performance measurement: the role of service users. Uniquely, I explore how user involvement in social service evaluation can make visible how these services enhance the quality of family and personal life. Using a case study of family support services in New South Wales, the research makes a series of empirical and theoretical contributions to problems of user involvement in social service evaluation. Firstly, the research examines the performance indicators currently used by government to monitor the efficiency and effectiveness of family support services in NSW. This shows that performance indicators in family support capture output more thoroughly than outcome, and confirms the minimal role that service users play in assessing service quality and outcomes. But while service users are largely excluded from participation in performance measurement, theoretical perspectives as diverse as managerialism and feminism treat service users as well placed to capture and report otherwise elusive information about care quality and outcomes. Further, participation in evaluation facilitates the exercise of users’ rights to self-expression and self-determination in the social service delivery and policy process. After identifying the widespread exclusion of service users’ perspectives from performance measurement in NSW family support, the thesis makes its more substantial contribution, in documenting findings from a detailed study involving adult family support service users (parents) and their workers (the ‘Burnside Study’). This qualitative study was conducted in four socio-economically disadvantaged service delivery sites located around New South Wales. Using focus group, interview and observational methods and a modified grounded theory approach, the study contributes exploratory evidence of what these service users think of, and how they think about service quality, outcomes, and evaluation in family support. The parents’ accounts of using family support capture their unfulfilled social ideals and the broader visions of the justice they hoped these social services would help them achieve. Their criteria for measuring service outcomes and service quality, and their views on evaluation methods embody core themes that social theorists have struggled to analyse, about the purpose of social services and the nature of ‘a good life’. The theoretical framework I develop highlights the role of family support in the context of service users’ struggles for social justice, and in particular, their struggles for self-realisation, recognition and respect (Honneth, 1995). The research extends theories of recognition beyond publicly articulated social movements to those struggles in social life and social politics that exist in what Axel Honneth terms the ‘shadows’ of the political-public sphere (2003a: 122). After establishing a conceptual framework that facilitates deeper interpretation of users’ perspectives, I present the findings in three categories: users’ perspectives on service outcomes; users’ perspectives on service quality; and users’ perspectives on evaluation methods. The findings show how service users define ‘service outcomes’ in the context of their struggles for recognition and respect, highlighting the contribution welfare services and welfare professionals make beyond the managerial ‘Three E’s’ of economy, efficiency, and effectiveness. Further, the findings confirm the importance of ‘helping relationships’ to the quality of service delivery in family support, despite the invisibility of service relationships in existing performance indicators. The complexity of worker-client bonds highlights the difficulty of evaluating social services using simple numerical counts of client or service episodes, and plays into broader debates about strategies for revaluing care work, and the role of care recipients. Finally, the findings show the role performance measurement processes and methods might play in facilitating users’ struggles for recognition. Users identified a role for evaluation in making visible the contribution of family support in pursuing their social justice goals, and saw evaluation as an opportunity in itself to facilitate recognition and respect. Overall, the thesis offers concrete evidence about how family support service users experience and define service quality and outcomes, and how they see their own role in evaluating the services they use. The research shows how users’ perspectives both contest and confirm the ‘new accountability’ of performance measurement, pointing to new directions, and further challenges, for conceptualising – and evaluating – social services.
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Domaszczynski, Piotr. "Performance evaluation of a network of polarimetric X-Band radars used for rainfall estimation." Diss., University of Iowa, 2012. https://ir.uiowa.edu/etd/3286.
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Networks of small, often mobile, polarimetric radars are gaining popularity in the hydrometeorology community due to their rainfall observing capabilities and relative low purchase cost. In recent years, a number of installations have become operational around the globe. The problem of signal attenuation by intervening rainfall has been recognized as the major source of error in rainfall estimation by short-wavelength (C-, X, K-band) radars. The simultaneous observation of precipitation by multiple radars creates new prospects for better and more robust attenuation correction algorithms and, consequently, yields more accurate rainfall estimation.
The University of Iowa hydrometeorology group's acquisition of a network of four mobile, polarimetric, X-band radars has resulted in the need for a thoughtful evaluation of the instrument. In this work, we use computer simulations and the data collected by The University of Iowa Polarimetric Radar Network to study the performance of attenuation correction methods in single-radar and network-based arrangements.
To support the computer simulations, we developed a comprehensive polarimetric radar network simulator, which replicates the essential aspects of the radar network rainfall observing process. The simulations are based on a series of physics- and stochastic-based simulated rainfall events occurring over the area of interest. The characteristics of the simulated radars are those of The University of Iowa Polarimetric Radar Network. We assess the correction methods by analyzing the errors in reflectivity and rainfall rate over the area of interest covered by the network's radars. To enable the implementation of the attenuation correction methods to the data collected by The University of Iowa Polarimetric Radar Network, we first developed a set of utilities to assist with efficient data collection and analysis. Next, we conducted a series of calibration tests to evaluate the relative calibration and channel balance of the 2 network's radars. Finally, in an attempt to verify the results obtained via computer simulations, we applied the set of attenuation correction algorithms to the data collected by The University of Iowa Polarimetric Radar Network.
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Rodriguez, Jennifer Marie. "Evaluating the Use of Task Clarification, Self-Monitoring and Performance Feedback." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3317.
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The effects of self-monitoring, task clarification, and performance feedback on the performance of critical tasks by assembly group supervisors in a manufacturing company were examined. This intervention involved the training of a supervisor to use task clarification, self-monitoring, and performance feedback to improve the work performance of the participating group leaders. A multiple baseline across participants and tasks design was used to examine the effects of the intervention. Measures included: generalization of group leader performance to another work period, procedural fidelity for training the supervisor, intervention integrity of the supervisor's training of the group leaders, treatment acceptability, and social validity. Results showed that the intervention was successful in increasing the overall task completion for both participating group leaders in multiple work intervals and that the intervention was implemented with fidelity and integrity.
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Pernas, Jose A. "Evaluation of Early Concrete Pavament Responses at USR 23, Delaware, Ohio." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1251301075.
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