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Chen, Cheng. "Downlink system characterisation in LiFi Attocell networks." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25420.
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There is a trend to move the frequency band for wireless transmission to ever higher frequencies in the radio frequency (RF) spectrum to fulfil the exponentially increasing demand in wireless communication capacity. Research work has gone into improving the spectral efficiency of wireless communication system to use the scarce and expensive resources in the most efficient way. However, to make wireless communication future-proof, it is essential to explore ways to transmit wirelessly outside the traditional RF spectrum. The visible light (VL) spectrum bandwidth is 1000 times wider than the entire 300 GHz RF spectrum and is, therefore, a viable alternative. Visible light communication (VLC) enables existing lighting infrastructures to provide not only illumination but also wireless communication. In conjunction with the concept of cell densification, a networked VLC system, light fidelity attocell (LAC) network, has been proposed to offer wide coverage and high speed wireless data transmission. In this study, many issues related to the downlink system in LAC networks have been investigated. When analysing the downlink performance of LAC networks, a large number of random channel samples are required for the empirical calculation of some system metrics, such as the signal-to-interference-plus-noise ratio (SINR). However, using state-of-the-art approaches to calculate the non-line-of-sight (NLoS) channel component leads to significant computational complexity and prolonged computation time. An analytical method has been presented in this thesis to efficiently calculate the NLoS channel impulse response (CIR) in VLC systems. The results show that the proposed method offers significant reduction in computation time compared to the state-of-the-art approaches. A comprehensive performance evaluation of the downlink system of LAC networks is carried out in this thesis. Based on the research results in the literature in the field of optical wireless communication (OWC), a system level framework for the downlink system in LAC networks is developed. By using this framework, the downlink performance subject to a large number of parameters is evaluated. Additionally, the effect of varying network size, cell deployment and key system parameters are investigated. The calculation of downlink SINR statistics, cell data rate and outage probability are considered and analysed. The results show that the downlink performance of LAC networks is promising in terms of achievable data rate per unit area compared to other state-of-the-art RF small-cell networks. It is found that co-channel interference (CCI) is a major source of signal impairment in the downlink of LAC network. In order to mitigate the influence of CCI on signal distortion in LAC networks, widely used interference mitigation techniques for RF cellular systems are borrowed and extensively investigated. In this study, fractional frequency reuse (FFR) is adapted to the downlink of LAC networks. The SINR statistics and the spectral efficiency in LAC downlink system with FFR schemes are evaluated. Results show that the FFR technique can greatly improve the performance of cell edge users and as well the overall spectral efficiency. Further performance improvements can be achieved by incorporating angular diversity transmitters (ADTs) with FFR and coordinated multi-point joint transmission (JT) techniques.
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Wang, Yunlu. "Load balancing in hybrid LiFi and RF networks." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31211.
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The increasing number of mobile devices challenges the current radio frequency (RF) networks. The conventional RF spectrum for wireless communications is saturating, motivating to develop other unexplored frequency bands. Light Fidelity (LiFi) which uses more than 300 THz of the visible light spectrum for high-speed wireless communications, is considered a promising complementary technology to its RF counterpart. LiFi enables daily lighting infrastructures, i.e. light emitting diode (LED) lamps to realise data transmission, and maintains the lighting functionality at the same time. Since LiFi mainly relies on line-of-sight (LoS) transmission, users in indoor environments may experience blockages which significantly affects users' quality of service (QoS). Therefore, hybrid LiFi and RF networks (HLRNs) where LiFi supports high data rate transmission and RF offers reliable connectivity, can provide a potential solution to future indoor wireless communications. In HLRNs, efficient load balancing (LB) schemes are critical in improving the traffic performance and network utilisation. In this thesis, the optimisation-based scheme (OBS) and the evolutionary game theory (EGT) based scheme (EGTBS) are proposed for load balancing in HLRNs. Specifically, in OBS, two algorithms, the joint optimisation algorithm (JOA) and the separate optimisation algorithm (SOA) are proposed. Analysis and simulation results show that JOA can achieve the optimal performance in terms of user data rate while requiring high computational complexity. SOA reduces the computational complexity but achieves low user data rates. EGTBS is able to achieve a better performance/complexity trade-off than OBS and other conventional load balancing schemes. In addition, the effects of handover, blockages, orientation of LiFi receivers, and user data rate requirement on the throughput of HLRNs are investigated. Moreover, the packet latency in HLRNs is also studied in this thesis. The notion of LiFi service ratio is introduced, defined as the proportion of users served by LiFi in HLRNs. The optimal LiFi service ratio to minimise system delay is mathematically derived and a low-complexity packet flow assignment scheme based on this optimum ratio is proposed. Simulation results show that the theoretical optimum of the LiFi service ratio is very close to the practical solution. Also, the proposed packet flow assignment scheme can reduce at most 90% of packet delay compared to the conventional load balancing schemes at reduced computational complexity.
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Theljeoui, Adel. "Système hybride de localisation des personnes âgées dans un habitat intelligent." Thesis, Toulouse 2, 2017. http://www.theses.fr/2017TOU20123.
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Durant la dernière décennie, les personnes âgées vivant seules sont de plus en plus nombreuses. Ainsi, afin de leur assurer une assistance à domicile continue, la notion de "maison intelligente" est apparue. Notre travail consiste à combiner trois technologies (Bluetooth Low Energy, audio et LiFi) afin de proposer un système hybride de localisation d'une personne âgée dans une maison intelligente, qui soit efficace et précis. Le principe d’hybridation de ces trois sous-systèmes repose sur la fusion de leurs résultats respectifs via la proposition de trois nouvelles métriques « DOP-Like » permettant d’évaluer le taux de « précision » et « d’exactitude » du résultat de chaque sous-système. Cette évaluation sert à constituer une pondération des résultats intermédiaires afin de calculer la position finale de la cible à localiser. Grâce à l’introduction de ces indicateurs, l’erreur de localisation de notre système est passée de 0,5m à 0,2m en moyenneOver the past decade, more and more elderly people are choosing to live alone. Therefore, in order to provide them with continuous home assistance, the notion of "intelligent home" has emerged. Our aim is to combine three technologies (Bluetooth Low Energy, Audio and LiFi) to provide an efficient and accurate hybrid indoor localization system that locates an elderly person inside a smart home. The principle of hybridization of these three subsystems is based on the combination of their respective results by proposing three new DOP-Like metrics to evaluate "precision" and "accuracy" of the result of each subsystem. This evaluation serves to constitute a weighting of the intermediate results in order to calculate the final position of the target to be localized. Thanks to the introduction of these indicators, the localization error of our system decreased from an average of 0.5m to 0.2m
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Seauve, Yoann. "Exploration, conception et mise en œuvre de circuit de pilotage pour micro-écrans à LED GaN." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALT069.
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Les avancées récentes dans le domaine de la fabrication de LEDs Inorganiques permettent la production de LEDs GaN à l’échelle micrométrique. Ces composant optiques, jusqu’ici produits uniquement dans des dimensions importantes, peuvent être associés à un circuit de pilotage CMOS afin de produire des micro-écrans. Les micro-LEDs produites en GaN offrent une luminance maximum et une vitesse de commutation bien supérieures aux autres technologies LEDs généralement utilisées à l’échelle micrométrique. Cependant, elles présentent aussi des caractéristiques électriques spécifiques, telles qu’une efficacité réduite et une dispersion de fonctionnement accrue pour une utilisation sous un faible courant. Ainsi, les méthodes de pilotage couramment utilisées avec d’autres technologies LED s’avèrent peu adaptées.Cette thèse a pour objectif le développement de circuits de pilotage pixel adaptés aux micro-LEDs GaN, autant par le type de pilotage mis en place que par un encombrement compatible avec la surface des LEDs employées. Une première partie des travaux porte sur les applications d’affichage, avec une matrice de pixels compacte exploitant la forte luminance des LEDs, tout en présentant une grande résolution. L’utilisation d’un pilotage de type PWM, avec un fonctionnement intermittent des LEDs sous un fort courant, est retenu en raison des spécificités électriques de ces dernières. Afin de maintenir des dimensions réduites pour ce circuit pixel malgré la relative complexité du pilotage mis en place, une construction en 3D du circuit est présentée. Un dérivé de la technologie 3D CoolCube développée au CEA Leti est envisagé afin de construire un micro-écran sur trois niveaux superposés. Le circuit de pilotage est réparti entre les deux premiers niveaux, constitués de circuits CMOS implémentés avec des transistors de natures différentes. Tandis que les LEDs GaN constituent le troisième niveau de l’assemblage.La seconde partie des travaux est orientée vers l’exploitation du temps de commutation réduit des LEDs GaN. Cette capacité à générer un signal optique de fréquence élevée s’avère particulièrement intéressante pour la réalisation de systèmes de communication optique. Plusieurs émetteurs de communication optique en champ libre, utilisant une LED GaN pour réaliser des transferts de données avec un débit de plusieurs Gb/s, sont présentés dans la littérature. Ces systèmes mono-LED, bien que rapides, s’avèrent complexes à mettre en œuvre et particulièrement encombrants. Des émetteurs utilisant une multitude de LEDs, émettant chacune une fraction du signal optique utilisé pour la transmission, constituent une implémentation alternative. Bien que les transmissions réalisées avec ce type d’équipement restent pour l’instant plus lentes, les émetteurs matricés s’avèrent beaucoup plus compacts. Le développement d’un circuit pixel binaire, permettant la commutation d’une LED entre les deux seuls états, allumé et éteint, est présenté. Grace à un mécanisme de compensation de la capacité parasite induite par la LED, ce circuit atteint une fréquence de commutation de 333 MHz. Enfin, une réflexion quant à l’organisation d’un ensemble de ces pixels au sein d’un émetteur matricé, amène à un contrôle thermométrique des différents pixels. La répartition des LEDs à allumer en fonction du code d’entrée qui en découle permet en effet d’assurer la monotonicité de la conversion réalisée, et offre une linéarité accrue par rapport à d’autres modes de décodages plus simples d’implémentationRecent advances in the field on inorganic LEDs, allow for manufacturing of GaN LEDs at micrometer scale. These optical devices, which were initially only manufactured with large dimensions, can be associated to a CMOS driving circuit to form micro-displays. GaN based micro-LEDs offer a maximum brightness and a commutation speed, well above other LEDs technologies used at micrometer scale. However, they also have specific electrical characteristics, such as reduced efficiency and large dispersion of behavior, when used with a reduced current. Consequently, driving methods commonly used with other types of LEDs are not appropriate for the control of such devices.This thesis focusses on the design of pixel driving circuits suitable for micro GaN LEDs, both in terms of implemented driving method and footprint compliance with the size of used LEDs. The first part of this work focusses on display applications, with a compact pixel matrix exploiting LEDs high brightness, while offering a large resolution. A PWM driving scheme, which implies sporadic operation of the LEDs under high current, is chosen to deal with LEDs specificities. In order to insure low silicon footprint despite the relatively high complexity of PWM driving, a 3D manufacturing of the circuit is introduced. A derivative of the CoolCube 3D technology that is developed by CEA Leti, is considered to manufacture a micro-display on three superposed levels. The driving circuit is split between the two first levels, made a CMOS circuit with different types of transistors. An array of GaN LEDs form the third level for the display.The second part of this thesis focusses on exploiting the reduced commutation time of the GaN LEDs. The ability to generate a high frequency optical signal is appropriate for building visible light communication emitters. Several free space optical communication emitters reported in the literature use a single GaN LED to transmit data at several Gb/s. Although, these single LED emitters are very fast, they are cumbersome and complex to build. Other emitters, based on a group of LEDs each emitting a part of the optical signal, forms an alternative solution. Even though data transmission is currently slower using these emitters, matrix based emitters are much more compact. This work introduce the design of a binary pixel, which make the LED switch between its two possible states, ON and OFF. Thanks to a LED introduced parasitic capacitance compensation method, this circuit reaches a 333 MHz operation frequency. Finally, a study of the best pixels organization inside the array led to a thermometer type of pixel control. The resulting association between each input code and the activated pixels insures the conversion monotonicity. It also shows a better linearity than other matrix control schemes with simpler implementations
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Lorrière, Nominoë. "Cellules photovoltaïques pour la récupération d'énergie et la communication de données." Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0570.
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L’invention des LED bleues de forte intensité en 1993 a permis une révolution générale de l’éclairage pour le grand public aussi bien que pour les commerces. Ces nouveaux dispositifs, proposent un rendement énergétique bien supérieur aux technologies commerciales précédentes, ce qui explique leur déploiement massif depuis la fin des années 2000. Les matériaux semiconducteurs composant les LED sont déjà utilisés dans le domaine de la microélectronique pour effectuer des fonctions logiques à hautes fréquences.La technologie LiFi tend à cumuler ces deux propriétés en ajoutant une fonction de transmission d’information aux points d’éclairages existants. L’information est transmise en modulant l’intensité de la lumière à haute fréquence, bien au delà des capacités distinctives de l’oeil. Cette technologie devrait subir un déploiement avec l’arrivée de l’Internet des Objets (IoT) qui apporte une grande demande de connections sans fil, incompatible avec les réseaux radiofréquences actuels. Le travail présenté ici porte sur la réception de cette modulation lumineuse. Les récepteurs usuellement utilisés sont des photodiodes mais ces dernières imposent des contraintes d’éclairage et de consommation difficilement corrélables avec les impératifs de l’IoT. Ainsi, ces travaux étudient la possibilité de réception de la modulation LiFi par des cellules et modules photovoltaïques, dont les deux principales qualités restent les grandes dimensions du détecteur permettant une omnidirectionnalité de réception et une résistance à l’ombrage ainsi que le caractère passif de la détectionThe invention of high-intensity blue LED hit the market and the retail industry in 1993. It even brought a revolution in lighting history. These new devices significantly improved energy efficiency than ever before and led to their massive deployment since the end of the 2000s. Semiconductor materials for LED devices are used in the microelectronics domain to implement high-frequency logic functions.Light fidelity (LiFi) technologies combine illumination and communication capabilities by implanting information transmission function to existing lighting equipment. Information is transmitted by using intensity modulation of optical sources at high frequencies, far beyond the range of visual perception. LiFi is an enabling technology for the Internet of Things (IoT) systems. IoT requires a large number of wireless connections, so it is not compatible with existing radiofrequency networks.This work is based on the reception of light modulation. Photodiodes are the mostly used receivers, however their constraints on lighting and consumption make it difficult to meet the requirements of the IoT. On the ground of this, this research is aimed at studying the possibility of receiving LiFi modulation by photovoltaic cells and modules due to their two main qualities: passive detection and large dimensions (omnidirectional reception and shade resistance)
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Uzeir, Eduart. "Una rassegna delle tecnologie di comunicazione ottica senza fili." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13271/.
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La tesi fa una panoramica delle tecnologie di comunicazione ottica, i principi di funzionamento, tecniche e strumenti utilizzati e possibili campi di applicazione. Nello specifico si esamina FSO, una tecnologia che opera nella banda delle frequenze a Infrarossi. VLC che opera nello spettro della luce visibile e UVC che opera con la luce Ultravioletta. Il terzo capitolo anlaizza LiFi, una tecnlogia che rappresenta l'evoluzione di VLC.
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Mohammedi, Merah Mounir. "Conception et réalisation d’un lien Light-Fidelity multi-utilisateur en intérieur." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLV061/document.
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De nos jours, le nombre d'appareils connectés nécessitant un accès aux données mobiles est en augmentation constante. L'arrivée d'encore plus d'ojects multimédias connectés et la demande croissante d'informations par appareil ont mis en évidence les limites de la quatrième génération de réseaux cellulaires (4G). Cela a poussé au développement de nouvelles méthodes, dont la 5G. L'objectif est d'être en mesure de prendre en charge la croissance des systèmes portables, des capteurs ou des sysèmes associés à l'internet des objets (IoT). La vision derrière la 5G est de permettre une société entièrement mobile et connectée avec une expérience consistente.Les petites cellules sont la base des normes de communication avancées telles que 4G et maintenant 5G. Ils résultent de l’utilisation de bandes de fréquences plus élevées pour l’accès radiofréquences (RF) afin de supporter de nouvelles normes et exigences croissantes en bande passante. La 5G utilise des ondes millimétriques et nécessite un déploiement dans un environnement urbain intérieur et urbain dense, ce qui peut s'avérer être un défi. C’est là que la 5G devra inclure des solutions de réseau hybrides et pouvoir coexister avec d’autres technologies d’accès sans fil. La communication par lumière visible (VLC) s’inscrit dans ce moule puisque la lumière visible correspond à la bande comprise entre 400 et 800 THz. Le spectre disponible est des milliers de fois plus large que le spectre RF et il n’interfère pas avec celui-ci. Le principe se base sur la combinaison de l'éclairage avec un lien de communication pouvant atteindre des dizaines de gigabits par seconde. Le potentiel est d’offrir un complément à la 5G dans un réseau hybride, offrant une vitesse élevée, aucune interférence et une sécurité accrue au prix d’une couverture limitée et d’une faible maturité technologique.L’objectif de cette thèse est donc de proposer et d’évaluer une implémentation expérimentale d’un système VLC en intérieur et multi-utilisateurs afin de répondre aux objectifs de la configuration light-fidelity (Li-Fi) dans le contexte d’une petite cellule. La première étape de cette étude est un état de l'art détaillé sur le principe de VLC dans la communication sans fil en intérieur et de l’accès multi-utilisateur. Cela permet de mieux expliquer le concept de notre désign et de comparer notre approche aux travaux existants. La deuxième étape consiste en une analyse des principes et des hypothèses pour le système VLC multi-utilisateurs en intérieur portant à la fois sur la technique de modulation et sur les schémas d’accès multi-utilisateurs. Les conclusions tirées des analyses théoriques et numériques servent de base pour la suite du travail. La troisième étape consiste en plusieurs analyses expérimentales sur l'optimisation des performances de diffusion pour un utilisateur unique, puis sur les performances multi-utilisateurs du système à l'aide de divers schémas d'accès. Le débit total avec une LED blanche commerciale atteint 163 Mb/s avec un taux d'erreur réduit d'un facteur de 3,55 grâce au processus d'optimisation des performances. Cette technique a l'avantage d'augmenter la flexibilité pour un scénario avec plusieurs utilisateurs sans augmenter la complexité car seuls les paramètres des filtres de modulation sont altérés. La taille de la cellule obtenue est de 4.56 m² à une distance de 2,15 mètres du transmetteur. Le capacité peut atteindre jusqu'à 40 utilisateurs, ou 40.62 Mb/s dans un scénario à 4 utilisateurs. Il est donc démontré que le système proposé pourrait fonctionner comme une cellule à une distance réaliste, avec un débit de données élevé et la capacité de répondre aux besoins d’un grand nombre d’utilisateurs tout en limitant les coûts de mise en œuvreNowadays, the number of connected devices requiring access to mobile data is considerably increasing. The arrival of even more connected multimedia objects and the growing demand for more information per device highlighted the limits of the fourth generation of broadband cellular networks (4G). This pushed for the development of new methods, one of which is 5G. The goal is to be able to support the growth of wearable, sensors, or related internet-of-object (IoT) systems. The vision behind 5G is to enable a fully mobile and connected society with a consistent experience. In consequence, there is a fundamental need to achieve a seamless and consistent user experience across time and space.Small cells are the basis of advanced communications standards such as 4G and now, 5G. They exist as a result of using higher frequency bands for RF access in order to support new standards and the increasing demands in bandwidth. 5G use millimeter waves and requires a deployment across indoor and dense urban environment which may prove to be a challenge. This is where 5G will need to include hybrid networking solutions and be able to coexist with other wireless access technologies. Visible light communication (VLC) fits into that mold since visible light corresponds to the band between 400 and 800 THz. The available spectrum is multiple thousand times the size of the RF spectrum and it does not interfere with it. The technique combines illumination with communication at possibly tens of gigabits per second. It has the potential to offer a synergistic pairing with 5G in a hybrid network, offering high speed, no interferences, and more security at the cost of limited coverage and low technological maturity.The goal of this thesis is thus to propose and evaluate an experimental implementation of an indoor multi-user VLC system in order to answer the objectives of Li-Fi setup in the context of a small cell. The first step of this study is a detailed state-of-the-art on VLC in indoor wireless communication and multi-user access. It allows the design of our work to be better explained and to compare our approach with existing works. The second step is an analysis of the principles and hypothesis supporting the indoor multi-user VLC system in the study both on the modulation technique and the multi-user access schemes. The conclusions drawn from theoretical and numerical analysis are used as a basis for the rest of the work. The third step is the experimental setup investigations on the single-user broadcast performances optimization and then on the multi-user performances of the system using various schemes. The total throughput using an off-the-shelf white LED reaches 163 Mb/s with a bit-error rate decreased by a factor of 3.55 thanks to the performance optimization process. This technique has the advantage of increasing the flexibility for a multi-access scenario while not augmenting the complexity as it only optimizes the modulation filter parameters. The multi-user access is obtained for a cell size of 4.56 m² at a distance of 2.15 meter away from the transmitter. The user capacity can reach up to 40 users, or 40.62 Mb/s in a 4-user scenario. It is thus demonstrated that the proposed system could function as a cell at a realistic range, with high data rate and the ability to provide for a large amount of users while limiting the cost of implementation
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Bechadergue, Bastien. "Mesure de distance et transmission de données inter-véhicules par phares à LED." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLV085/document.
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En réponse aux problèmes croissants liés aux transports routiers - accidents, pollutions,congestions - les véhicules à faibles émissions, équipés de systèmes de transports intelligents (ITS)sont progressivement développés. Si la finalité de cette démarche est le véhicule entièrementautonome, on peut néanmoins s'attendre à voir d'abord sur nos routes des véhicules automatisés surdes phases de conduite spécifiques. C'est le cas du convoi automatisé, qui permet à plusieursvéhicules de rouler en convois de manière automatique et donc d'augmenter la capacité des voies decirculation tout en réduisant la consommation de carburant. La fiabilité de cet ITS repose surplusieurs briques technologiques, et en particulier sur la mesure de distance et la transmission dedonnées véhicule-véhicule (V2V).De nombreux systèmes permettent de réaliser ces deux fonctions vitales comme, par exemple, lesradars ou lidars pour la mesure de distance et la technologie IEEE 802.11p pour la communicationvéhiculaire. Si ces différents dispositifs présentent de très bonnes performances, ils sont néanmoinsparticulièrement sensibles aux interférences, qui ne cessent de se multiplier à mesure que le nombrede véhicules équipés augmente et que le trafic est dense. Pour pallier les dégradations deperformances induites par de telles situations, des technologies complémentaires pourraient donc êtreutiles. Le récent développement des diodes électroluminescentes (LED) blanches, en particulier pourl'éclairage automobile, a permis l'émergence des communications optiques visibles sans fil (VLC).Les phares à LED sont alors utilisés pour transmettre des données entre véhicules et avec lesinfrastructures. Malgré la puissance limitée de ces éclairages, plusieurs études ont montré qu'unetransmission de qualité est possible sur quelques dizaines de mètres, faisant de la VLC uncomplément particulièrement intéressant à l'IEEE 802.11p, en particulier pour les convoisautomatisés. Par analogie, on peut alors se demander si les phares ne pourraient pas être aussi utiliséspour mesurer la distance V2V.Le but de cette thèse est donc de proposer et évaluer un système dédié aux situations de convoisautomatisés qui, à partir des phares avant et arrière des véhicules, transmet des données et mesuresimultanément la distance V2V. Dans un premier temps, une étude détaillée de l'état de l'art de laVLC pour la communication V2V est effectuée afin de déterminer l'architecture de base de notresystème. La fonction de mesure de distance est ensuite ajoutée, après une revue des différentestechniques usuelles. Une fois l'architecture générale du système établie, elle est dans un premiertemps validée par des simulations avec le logiciel Simulink. En particulier, les différents paramètressont étudiés afin de déterminer leur impact sur la résolution de mesure de distance et les performancesen transmission de données, puis afin de les optimiser. Si ces simulations fournissent des indicateursimportants pour la compréhension du système, elles ne peuvent cependant remplacer les tests d'unprototype réel. L'implémentation de ce prototype est alors détaillée ainsi que les tests réalisés dansdifférentes configurations. Ces différents tests démontrent l'intérêt des solutions proposées pour lamesure de distance et la communication V2V en convois automatisésIn response to the growing issues induced by road traffic - accidents, pollution, congestion- low-carbon vehicles equipped with intelligent transportation systems (ITS) are being developed.Although the final goal is full autonomy, the vehicles of the near future will most probably be selfdrivingin certain phases only, as in platooning. Platooning allows several vehicles to moveautomatically in platoons and thus to increase road capacity while reducing fuel consumption. Thereliability of this ITS is based on several core technologies and in particular on vehicle-to-vehicle(V2V) distance measurement and data transmission.These two vital functions can be implemented with several kinds of systems as, for instance, radars orlidars for range-finding and IEEE 802.11p-based devices for vehicular communication. Althoughthese systems provide good performances, they are very sensitive to interferences, which may be agrowing issue as the number of vehicles equipped will increase, especially in dense traffic scenario.In order to mitigate the performance degradation occurring in such situations, complementarysolutions may be useful. The recent developments of white light-emitting diodes (LED), especiallyfor the automotive lighting, has allowed the emergence of visible light communication (VLC). WithVLC, the vehicle headlamps and taillights are used to transmit data to other vehicles orinfrastructures. Despite the limited optical power available, several studies have shown thatcommunication over tens of meters are possible with a low bit error rate (BER). VLC could thus bean interesting complement to IEEE 802.11p, especially in platooning applications. By analogy, onecould wonder if the automotive lighting can also be used for V2V range-finding.The goal of this thesis is thus to propose and evaluate a system dedicated to platooning configurationsthat can perform simultaneously the V2V distance measurement and data transmission functionsusing the headlamps and taillights of the vehicles. The first step of this study is thus a detailed stateof-the art on VLC for V2V communication that will lead to a first basic architecture of our system.Then, the range-finding function is added, after a careful review of the classical techniques. Once thegeneral architecture of the system is drawn, it is validated through simulations in the Simulinkenvironment. The different degrees of freedom in the system design are especially studied, in orderfirst to evaluate their impact on the measurement resolution and the communication performances,and then to be optimized. Although these simulations provide crucial keys to understand the system,they cannot replace real prototype testing. The implementation of the prototype is thus fullydescribed, along with the results of the different experiments carried out. It is finally demonstratedthat the proposed solution has a clear interest for V2V range-finding and communication inplatooning applications
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Li, Liyi. "Structural, functional analysis of synaptotagmin 1 in synaptic transmission using hippocampal autapses." [S.l.] : [s.n.], 2005. http://webdoc.sub.gwdg.de/diss/2005/liyi.
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Appleton, Catherine. "Life after life imprisonment." Thesis, University of Oxford, 2008. http://ora.ouls.ox.ac.uk/objects/uuid:ee377c75-7a0b-4ee5-9442-39034b5cd8ab.
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Borhidai, András. "Models for Life Cycle Cost Estimation of Spare and Wear Parts for Urban Gondola Lift Systems : A Case Study." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-74544.
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Urban gondola lift systems are becoming a regular sight rather than a rarity throughout the globe. Authors attribute their increasing popularity to factors such as environmental sustainability, operational reliability and cost efficiency compared to other right-of-way transit solutions. Replacing conventional modes of transit with urban gondolas cannot however be achieved without tackling several operational challenges. As potential new operators often lack the human resources and knowledge base required to successfully man, operate and maintain systems, they turn to manufacturers for increased after-sale support. Companies of the Doppelmayr Garaventa Group, the world’s largest manufacturer of gondola lifts, responded to these demand patterns by offering complete operations & maintenance contracts which, among other services, include the delivery and installation of reserve components. Calculating the total cost of such components for the life cycle of a system however still proves to be demanding and requires new computational models to increase its efficiency. The applicative purpose of this paper was thus set to formulate a model that is capable of performing life cycle cost calculations for components of urban gondola lift systems, according to a set of criterion defined by industrial entities. Its research aim is accordingly to answer questions about how concurrent instruments are set up, what models does contemporary research regard as efficient in similar industries and whether these models are able to enhance life cycle cost calculation capability within the urban gondola lift market. These aims were achieved through an analysis of current company practices, followed by the formulation of two new model alternatives based on a review of contemporary scientific literature, and concluded by an iterative process wherein the two alternatives were compared to each other in terms of performance and then merged to combine the best performing features of each version. Through a second iteration, the merged model was then compared to current instruments and established as the superior choice, using industry criteria. The paper concludes by resolving the research questions it set out to answer and making further recommendations for the direction of future research and studies.
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Snider, David E. "Architecture is Life... ...Life is Architecture." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/31734.
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When thinking about architecture, I cannot help but think about my life and the things that have affected my life. How does the environment around us effect the daily decisions we make? How do the experiences throughout our life impact who we are and who we become? The people and surroundings we choose will ultimately decide the type of people we become. When we select our surroundings we are in turn selecting our ideal community. Everyone is trying to achieve community in some sense, from individuals to city planners. Council members, politicians, city officials... make decisions everyday based on their idea of what community is to them and their citizens.
In the following pages I will design a community and put in place the elements for it to prosper and grow...
Master of Architecture
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Carrillo, Galeana Ana Victoria. "Investigación para mejorar el servicio al cliente en una cafetería en Cholula." Thesis, Universidad de las Américas Puebla, 2010. http://catarina.udlap.mx/u_dl_a/tales/documentos/lii/carrillo_g_av/.
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Este estudio examina el servicio al cliente en la cafetería las Duyas
ubicada en los portales del zócalo de Cholula, Puebla. Está
estimado que al establecer un excelente servicio en los restaurantes y
cafeterías, sirve como base para una relación excelente con
los clientes. Una buena relación es el resultado de haber logrado
una completa satisfacción, lo que nos da una retención del
mismo o mejor dicho una muy posible lealtad de parte de ellos (Brink &
Berndt 2008:13-20).
El crear lealtad con los clientes es resultado de ventas o visitas continuas
de los mismos provocado por la información transmitida boca a boca
de manera positiva. Para maximizar la rentabilidad es necesario cumplir las
necesidades de los clientes, y así poder lograr dicha meta (Cant,
Strydom, Jooste & du Plessis 2006:11-12).
Los restaurantes y cafeterías deben de tratar de mantener su nivel
de servicio en el punto más alto posible para así retener a
sus consumidores y construir relaciones duraderas. Por lo tanto el problema
que enfrentan los restaurantes y cafeterías es el de proporcionar
un alto nivel de servicio.(cont.) En ausencia de criterios específicos para el excelente servicio en los restaurantes y cafeterías, se investigo el nivel de atención al cliente en la cafetería "Las Duyas", para así revelar los criterios que deben de ser arreglados para un buen servicio. La contribución de este estudio radica en la identificación de los criterios para una magnifica atención en los restaurantes y cafeterías.
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Vázquez, Mateos Manuel Orlando. "Planeación y coordinación de recursos para la construcción del telescopio en el INAOE con montura azimut y foco nasmyth." Thesis, Universidad de las Américas Puebla, 2010. http://catarina.udlap.mx/u_dl_a/tales/documentos/lii/vazquez_m_mo/.
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Lara, Turrent Alejandro. "Reducción de desperdicio de plástico, mediante la aplicación de la metodología SIX SIGMA DMAIC." Thesis, Universidad de las Américas Puebla, 2012. http://catarina.udlap.mx/u_dl_a/tales/documentos/lii/lara_t_a/.
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Kim, Jung-Suk. "Life." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1327090859.
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Neal, Deborah. "Life after stroke : 'a life I like' and 'a life to live'." Thesis, Bournemouth University, 2017. http://eprints.bournemouth.ac.uk/29903/.
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This doctoral thesis describes, critically evaluates and reflects on the development and evaluation of an innovative approach to supporting individuals after a stroke. This approach consists of; a once-weekly, twelve week, stroke self-management programme consisting of interactive information provision, rehabilitation and exercise in an environment of peer and caregiver support called ‘ASPIRE’ – an acronym for Acute stroke, Self-management support, secondary Prevention, Information, Rehabilitation and Exercise. The development of the ASPIRE programme was influenced by interviews with those involved in the ASPIRE programme and the process and results of a primary research evaluation using mixed methods. The aim of this two phase evaluation was to 1) identify participants’ views as to the outcomes of attending the ASPIRE programme, using a grounded theory approach and 2) identify whether those outcomes could be assessed using currently existing standardised validated tools. Three key themes were identified; A life I like – the confidence to do the everyday activities important to a person after a stroke; Changing hearts and minds – the confidence, knowledge and health behaviour change to reduce vascular risk after stroke and In the same boat – the benefits of peer support for stroke survivors and caregivers. These themes were used to select relevant standardised validated tools; the Stroke Knowledge Test (SKT), Stroke Self Efficacy Questionnaire (SSEQ), Cerebrovascular Attitudes and Beliefs Scale (CABS-R), Hospital Anxiety and Depression Scale (HADS) and Caregiver Strain Index (CSI). Statistically significant gains were identified in the SKT and HADS – depression score. The tools were useful and sensitive to change; however, the SSEQ had a ceiling effect with this cohort and the CABS-R was found difficult to use. Although existing outcome tools may not adequately measure new multi-factorial post-stroke interventions such as the ASPIRE programme, the unique contributions of this doctoral thesis to the body of knowledge are that; • An enabling culture, that includes peer support for stroke survivors and caregivers, helps individuals to move forward after stroke. • Support for self-generated goal planning, based on a ‘life-thread’ approach, may improve outcomes from stroke survivors’ perspectives. • Supporting individuals to develop the confidence, knowledge and health behaviours to reduce vascular risk can be an integral and complementary part of rehabilitation after stroke. A multi-factorial programme to enable life after stroke should therefore include both rehabilitation “A life I like” and secondary prevention “A life to live”. • Individually tailored exercise programmes to support rehabilitation and secondary prevention can be used with groups of stroke survivors with a wide range of deficits.
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Vong, Man Ieng. "Quality of work life and life satisfaction." Thesis, University of Macau, 2006. http://umaclib3.umac.mo/record=b1641454.
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Skelly, Michael V. "Fatigue life program using strain-life methods." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA267310.
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Gerhold, Malte D. G. "The meaningful life and the good life." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413052.
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Keanie, Andrew. "William Wordsworth : a life beyond a life." Thesis, University of Ulster, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268608.
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Lysowski, Mark Robert. "Groundbreaking: art-making life; life-making art." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1303231854.
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Bernard, Julia M., Amber Seidel, Mary Oglesby, and Colleen Pagnan. "Mothers in HDFS Academic Life: When Your Professional Life and Real Life Intertwine." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/5808.
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Abdalsadig, M. "Gas lift optimization utilising automation gas lift valve." Thesis, University of Salford, 2017. http://usir.salford.ac.uk/44593/.
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Gas lift is one of the most common forms of artificial lift, particularly for offshore wells. This is due to its relative downhole simplicity, flexibility, reliability, and ability in operating over a wide range of flow rates with the limited well head space. Generally, Gas lift optimization can reduce the operating cost with increase in the Net Present Value (NPV) and maximization of the recovery from the asset. All of the previous researches have reported that conventional gas lift technologies’ designs have limitations on gas lift valve. Nonetheless, traditional gas lift technologies that were designed and developed in 1950’s do not have resistance when subjected to high temperature and high pressure in subsea wells. This therefore unable the flows of the gas lift to be coherently controlled. Moreover, gas-lifted oil wells can lead to failure unless a smart gas lift valve unit is used in the controlling the amount of the gas inside the tubing string. In this study, an automation gas lift valve unit with the corresponding control line was experimentally simulated on a dedicated apparatus. This enables real-time data on the gas lift valve to the surface to be demonstrated and accordingly analyzed. Under the conventional method of practice the injection pressure of the gas is normally used in operation of the valve. Whereas in this investigation the port size of the gas lift valve was remotely adjusted from the assumed surface using the apparatus. A devoted computer program LabVIEW was also used in determination of the gas passage through the smart gas lift valve, thus distilling the real time data. The results have shown those optimizations are achievable at high gas injection pressure when 87 psi is used and when the valve is 15% open (or 0.95mm port size diameter). Also, the wellhead pressure reaches to the minimum value of 0.9 psi in which high-pressure drop between the reservoir pressure and the top surface will occur. Throughout this investigation, water was used as a working fluid since the column of corresponding water in petroleum production tubing has the highest hydrostatic pressure of 2.8 psig compared with crude oil. Hence, during the gas lift process crude oil will be less cumbersome to produce than water. The results present the maximum production rate of 18.3 lit/min (with 83% improvement on production) could be achieved. The results obtained experimentally were also used in constructing an economic analysis from the use of smart gas lift valve for different scenarios namely: (i) in gas lift natural flow and (ii) the gas lift wells. It was demonstrated that the flow rate can be enhanced from 91bbl/day to 166.5 bbl/day for the gas lift natural flow, and from ‘Zero’ (or non-production) to165.6 bbl/day for the gas lift well. Based on these results, the NPV of the gas lift natural flow will be approximately $2793 on $37 per barrel and for the gas lift well will be about $6127.2.
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Bäckman, Johan. "Life Aquatic." Thesis, KTH, Arkitektur, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-123397.
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Projektet är en stad som ligger mellan Umeå och Vasa (Finland), det är den smalaste delen av Bottniska viken med bara ca 60 km öppet hav. Jag ville undersöka vad det fanns för möjligheter med en stad som utnyttjar sitt läge. Så jag planerade en offshore hamnstad som bygger sig själv och sprider sig. Varför? 60-talets men även samtida megastrukturer planerades ofta för att ge en teknisk lösning på ett visst problem. De här problemen vare sig det är bostadsbrist eller klimatförändring är fortfarande aktuella och lösningarna likaså. Därför ville jag använda min struktur som ett redskap för att testa och reflektera kring dessa idéer för boende. En jurymedlem jämförde mig kritiskt vid en skata som plockat silvret från mina referenser, men det han inte förstod var att jag plockade silvret just för att i min fiktiva värld analysera det. Analysen gjorde jag genom att hitta på invånare som med sinne och själ fick reflektera kring livet i en modul och etc.The project is a city located between Umeå and Vasa, it is the most narrow part of the Gulf of Bothnia with only 60 km of open waters. I wanted to investigate existing possibilities with a city that exploits its location. So I designed an offshore port city that builds itself and grows. Why? The megastructures of the 60’s but also contemporary ones were often planned to give a technical solution to a certain problem. These problems whether it’s housing shortage or climate change are still current and the solutions as well. This is why I wanted to use my structure as a tool to test and reflect about these concepts of living. A member of the jury critically compared me to a magpie that had picked the silver of my references, but what he didn’t understand was that I had picked the silver to analyze it in my fictional world. I made the analysis by imagining inhabitants that through their mind and soul reflected on life in a module and etc.
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Dean, H. A. Mark. "Illustrating Life." VCU Scholars Compass, 2006. http://hdl.handle.net/10156/1480.
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Gibson, Simon John. "Life strategies." Thesis, Royal Holloway, University of London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325521.
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Shepard, Jennifer L. "Pretend, life." View electronic thesis, 2008. http://dl.uncw.edu/etd/2008-3/rp/shepardj/jennifershepard.pdf.
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Polo, Guia Elizabeth Keila, Chavez Patricia Giovana Ramos, Castro Miguel Angel Reyes, and Delzo Antony Nilton Serva. "Beautiful Life." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2018. http://hdl.handle.net/10757/625309.
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El presente proyecto tiene como objetivo diseñar y analizar la idea de negocio BEAUTIFUL LIFE, una plataforma web y aplicación que permitirá a los centros estéticos brindar los servicios de belleza a los usuarios según la ubicación más cercana en el menor tiempo posible.
Nuestro objetivo es satisfacer las necesidades de frustración e incomodidad de los traslados por el alto nivel de congestión vehicular, tiempos de espera, la poca privacidad de los establecimientos de belleza, poca flexibilidad de horarios y las actividades imprevistas o no programadas generando urgencias de último momento.
Según la investigación cualitativa realizada en Lima Metropolitana, los principales servicios utilizados son corte de cabello, depilación, laceado, manicure y pedicure se cubrirá la demanda con nuestra principal ventaja competitiva ser una red interactiva entre los socios estratégicos que conectarán directamente con los usuarios, no tendrán que movilizarse al salón de belleza ni hacer largas colas de espera. El servicio se brindará en la comodidad de tu hogar, oficina u otros lugares apropiados a conveniencia.The objective of this project is to design and analyze the business idea BEAUTIFUL LIFE, a web platform and application that will allow aesthetic centers to offer beauty services to users according to the closest location in the shortest possible time. Our principal objective is to satisfy the needs of frustration and discomfort of the transfers due to the high level of traffic congestion, waiting times, poor privacy of beauty establishments, little flexibility of schedules and unforeseen or unscheduled activities, generating last-minute urgencies moment. According to the qualitative research conducted in Metropolitan Lima, the main services used are hair cutting, waxing, ironing of hair, manicure and pedicure. The demand will be covered with our main competitive advantage being an interactive network between the strategic partners that will connect directly with the users dont move to the beauty salon or make long waiting lines. The service will be provided in the comfort of your home, office or other appropriate places at your convenience.
Tesis
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Woxinger, Sköld Linnea. "Life Forms." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-17101.
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Life Forms is an examination of organic shapes in textile material and garments. The clothes deals with questions of tactile and emotional attraction in fashion, while the project as a whole is an attempt to constantly let creativity and curiosity be a part of the process.By using a method of letting go of the control and see what chance and the properties of the material might lead to, this work has become a growing organism of its own.The end result is a group of unique pieces, all in different materials and colour shades. They’re held together by concept as well as relations in tone and cuts. The collection could be viewed as a visual statement or worn with lots of care and love.Program: Modedesignutbildningen
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Haubold, Johannes Helmut. "Laic life." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624995.
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Camati, Anna Stegh. "Other life." reponame:Repositório Institucional da UFPR, 2013. http://hdl.handle.net/1884/29520.
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Resumo: O estudo da cosmovisão de Hughes, inspirada em Lawrence e remontando a Bergson, abre novas perspectivas não exploradas pelos críticos, evidenciando aspectos inéditos em sua poesia. Da mesma maneira que Lawrence, Hughes procura ir alem das aparências exteriores, revelando o próprio processo vital, que e captado somente em raros momentos de percepção intuitiva. 0 objetivo principal de sua poesia e salientar como real idades 'outras ' as criaturas do mundo rião-humano, destacando-as como receptáculos da poderosa força vital existente no uni verso. Insiste em celebrar a vitalidade dos pássaros, animais e plantas, porque considera o homem demasiadamente auto matizado,fato que o impede de viver. Os indícios de degeneração que vê no homem moderno, Hughes os atribui a excessiva mecanização, que reduziu o homem a um autômato, interrompendo o contacto vital com as outras criaturas vivas. Estas ideias, que Lawrence expõe nas obras em prosa, i .e., ensaios, cartas, relatos de viagens, especulações filosóficas, romances e contos são retomadas por Hughes em sua poesia, constituindo não apenas a principal fonte de inspiração, como também a base de sua visão do mundo. Na primeira parte desta dissertação e colocada em relevo a filosofia de Bergson, que foi assimiladas reinterpretada por Lawrence e Hughes, servindo de fundamentação metafísica para a obra de ambos. Na segunda parte traçamos o paralelo existente entre o simbolismo animal de ambos os autores, demonstrando que as metáforas animais de Lawrence, que representam forças instintivas e intuitivas, estão também aparentes em Hughes, evidenciando sua habi1 idade em dar nova forma ao material em que se inspirou, bem como provando que maior compreensão do pensamento de Lawrence possibilita novos enfoques na poemática de Hughes.
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Ingabire, Cyuzuzo. ""World Life"." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1248518/.
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During this time of interest and uncertainty in immigration, a foreigner seeking an education, home, and career wonders how welcoming America really is. This documentary film focuses on how the organization known as World Life is involved in helping international students in terms of language, accommodation, and religion. It follows an organization that is willing to open up and welcome them into the community.
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Hassanzadah, Ali R. "LIFE EXPECTANCY." CSUSB ScholarWorks, 2016. https://scholarworks.lib.csusb.edu/etd/382.
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When someone walks into an insurance company and wants to purchase life insurance, the insurance company has to consider an important question: How long will this client live? His date of death is not exactly predictable, so the insurer does not know exactly when the life insurance benefits will be payable. However, the insurer can use a model that can calculate human mortality. With this mortality model, probabilities of deaths at particular ages can be calculated. Rather than trying to figure out when a client dies, the convention in actuarial science is to phrase things in terms of survival models. There are popular survival functions that enable insurers to perform this calculation. With these functions, insurers are able to efficiently provide this service and ensure that life insurance will continue to be a thriving field of work. After we define basic notation and terms, we look at standard survival models. Then we consider a recently proposed model by Chi Heem Wong and Albert K. Tsui.
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Irvin, William Ross. ""Life Holders"." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1505228/.
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Oyola, Carlos Harriet Penny, Perez Jill Roxana Farro, Riofrio Alejandra Alocén, Legrand María Del Carmen Luna, and Rodríguez Jonathan Francis Espinoza. "Life Organic." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2018. http://hdl.handle.net/10757/624079.
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Life Organic es una propuesta de negocio con sentido ético ya que contribuye con la buena alimentación de las personas ofreciendo un portal digital móvil y web donde el target pueda obtener información transparente para adquirir alimentos orgánicos de una manera rápida, fácil y confiable; esta aplicación está dirigida para todas las personas que deseen llevar una vida saludable a través del consumo orgánico.Life Organic is a business proposal with ethical sense given that it contributes to the good nutrition of people by offering a mobile and web digital portal where the target can obtain transparent information to acquire organic food in a fast, easy and reliable way; this application is aimed at all people who wish to lead a healthy life through organic consumption.
Trabajo de investigación
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Rogers, Leslie. "Stalling Life." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/3118.
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Using a diagram, glossary, anecdotes, and first-person narrative histories, I explain how I use sculptural installation, image making, and serendipity to exploit the illogical to the point of being meaningful.
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Bennett, Bernardita. "Still life." Tesis, Universidad de Chile, 2011. http://www.repositorio.uchile.cl/handle/2250/101345.
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Chávarri, Salazar Tomás, and Kenchington Francisco Pérez. "EMPLOYEE LIFE." Tesis, Universidad de Chile, 2017. http://repositorio.uchile.cl/handle/2250/146400.
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TESIS PARA OPTAR AL GRADO DE MAGÍSTER EN ADMINISTRACIÓNTomás Chávarri Salazar [Parte I], Francisco Pérez Kenchington [Parte II]
Esta nueva empresa se caracteriza por su orientación al servicio tecnológico de gestión de capital humano aportando a otras compañías a mejorar su rentabilidad en relación a dos aspectos: 1) Gestión de la información en tiempo real; y 2) búsqueda constante de una adecuada experiencia al cliente. Con ello se pretende consolidar el área de los recursos humanos como un agente importante en el manejo administrativo que permita agregar valor a las empresas. Estas intenciones surgen de la necesidad que hoy tienen las empresas, las cua-les cada vez más invierten en RRHH, se estima que casi el 60% de las empresas ha aumentado su presupuesto en esta línea en los últimos 12 meses (Fuente: Tendencias Globales en Capital Humano 2015, Deloitte University). Y que la adopción de la tecnolo-gía es cada vez más rápida, lo cual permite estar más al tanto de las situaciones y con-textos requeridos un mundo cada vez más conectado. Para poder hacer frente a estos desafíos es que Employee Life busca por medio de su plataforma web de gestión un aliado para las empresas en donde podrán gestionar todo el ambiente de recursos humanos de una simple y mejor manera. Potenciándose como una herramienta social, sacando provecho de sus modelos predictivos, la bús-queda constante de co-creación con el cliente, buscando constantemente la satisfacción del cliente por medio de un buen trabajo de post venta y alta gestión de la información en tiempo real. Esta esta idea se desarrollará por intermedio de dos fuentes de financiamiento: 1) Licenciamiento y 2) Reportería Business Intelligence, buscando apalancar el mo-delo de negocios. Dentro del análisis, tanto de oportunidad de negocios como financiero, se podrá observar la factibilidad del desarrollo tecnológico con un VAN positivo del modelo, utili-zando una TIR de 39,28% (desprendida de Damodaran), evaluado a 6 años. Se pretende ofrecer al nuevo socio inversionista el 48% de la sociedad invirtiendo la suma de 2.523,96 UF, para efectos de equipos y etapa de pre-operación, lo cual eva-luado a 6 año se proyecta una rentabilidad promedio anual de un 37%, lo cual se espe-rará un Future Value de la empresa de un 38.379 UF al final del periodo. Implicando una gran oportunidad de negocios para cualquier inversor.
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Wan, King Hung. "Life choices and life chances : moving forwards from offending." Thesis, University of East Anglia, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435967.
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Leigey, Margaret E. "Life while serving life examining the correctional experiences of older inmates serving a life without parole sentence /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 439 p, 2007. http://proquest.umi.com/pqdweb?did=1397904001&sid=4&Fmt=2&clientId=8331&RQT=309&VName=PQD.
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Barsky, Jeannette Lois, and University of Lethbridge Faculty of Arts and Science. "Women's health, occupational, and life experiences : a life-cycle perspective." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 1999, 1999. http://hdl.handle.net/10133/99.
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Almost 40% of the Canadian workforce shows signs of progressive burnout. For a variety of reasons, stress within the workplace appears to be increasing. The popular press and academic journals suggest that chronic job stres, burnout, will be most significant workplace issue in the new millennium. Although both men and women suffer from stress and burnout, it appears that women are at a greater risk than men. Unfortunately, research on the relationship between women's stress and their heatlh has not kept pace with the popularization of the problem. We could understand this relationship better if we had more information about women, their health history (including phases of development over the life span), and occupational history. Relatedly, as the baby-boomer generation ages to mid-life, there appears to be a sea change on the horizon: one in which women are demanding answers and knowledge about the process of menopause and its effect on their lives, inside and outside the home. To fill this void, the proposed research will address the life change of women, and specifically, how their stages of development and occupational and health histories relate to the experience of burnout.xv, 126 leaves ; 29 cm.
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Barsky, Jeannette Lois. "Women's health, occupational, and life experiences, a life-cycle perspective." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0020/MQ49140.pdf.
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Mccool, Jane A. "Life experiences of Cambodian-American refugee women : segmented life stories /." View online ; access limited to URI, 2003. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3115634.
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Miglorância, Felipe Rudiuk. "Life monitoring : a proposal for product end of life management." Instituto Tecnológico de Aeronáutica, 2011. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=3029.
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This work develops an aircraft end of life management framework applicable to an executive airplane manufacturer. Usually, end of life operations are outsourced and the original airplane manufacturers do not get directly involved in whatever decisions and tasks are done in this field. However, after considering the possibility of managing the aircraft';s end of life through the manufacturer';s customer support department, a new approach emerges for managing reusable systems and making disposal of non reusable systems and carcasses. It tends to elevate end of life operations from an obligation to become an enhancement in customer satisfaction and possibly revenue, somewhat similar to what happened to maintenance procedures in the recent past of the aeronautical sector. For the development of the proposed system (approach), a process mapping is made for better understanding of operations needed to be done and a strategic approach to these operations is reached, leading to a new maintenance program called Life Monitoring. Therefore, a linkage among environmental management, customer support and aircraft salvaging is established in a way that both the company and the customer be benefited. Although the program is elaborated and applied in a simulated case, the results may be transferred to the manufacturing of any real executive aircraft and, less directly, any product.
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Lu, Chang-Kai, and 呂昌愷. "A 56 Gb/s PAM4 VCSEL-Based LiFi Transmission with Two-Stage Injection-Locked Technique." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ts79mf.
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碩士景文科技大學
電子工程系電腦與通訊碩士班
105
A 56 Gb/s four-level pulse amplitude modulation (PAM4) light-based WiFi (LiFi) transmission based on a 680-nm/5.4-GHz vertical-cavity surface-emitting laser (VCSEL) with a two-stage injection-locked technique is proposed and demonstrated. Experimentally results show that a 5.4-GHz VCSEL with a two-stage injection-locked technique is effective for 56 Gb/s PAM4 LiFi transmissions. To the authors’ knowledge, it is the first one to adopt a 680-nm VCSEL transmitter with two-stage injection-locked technique in a 56 Gb/s PAM4 LiFi transmission. A pair of doublet lenses is employed in the proposed PAM4 VCSEL-based LiFi transmissions to enhance the free-space link. The link performances of the proposed PAM4 LiFi transmissions have been analyzed in real time. Good bit error rate performance and three independent clear eye diagrams are obtained over a 20-m free-space link. Such a proposed 56 Gb/s PAM4 VCSEL-based LiFi transmission with two-stage injection-locked technique has the potential to play a significant role in future wireless infrastructure for providing high transmission rate and long free-space transmission distance effectively.
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Merrell, Brian T. "The Effect of LIFT on Life Effectiveness and Locus of Control." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7588.
Full textAbstract:
The purpose of this study is to measure the effects of the Leadership Inspiration
Facilitation Team (LIFT) program on the life effectiveness and locus of control of a
group of sixth grade students at Schultz Middle School. The participants consisted of 36
sixth grade students, ages 10 to 12 years, from a single public middle school. The
participants attended a two-day summer adventure-based ROPES camp.
The Review of Personal Effectiveness and Locus of Control (ROPELOC)
instrument was administered at the beginning (pre-test), the end (post-test), and six
months later (follow-up). The twelve domains of life effectiveness have been identified,
including active involvement, cooperative teamwork, leadership ability, open thinking,
quality seeking, self confidence, self efficacy, social effectiveness, stress management,
time efficiency, coping with change, and overall effectiveness. Two domains of locus of
control were identified: external and internal. Composite ROPELOC, subscale, and
gender data were all analyzed using t-tests of independent samples.
The analysis showed no significant improvement in participants? composite
ROPELOC score between the pre, post, and follow-up. However, there was an increase
between the pre and post, although the increase was not at a significant level. Significant increases in participants? scores were found in three of the 14 ROPELOC subscales:
cooperative teamwork, coping with change, and external locus of control. Significance
for cooperative teamwork was found between the pre-test and post-test. Significance for
coping with change and external locus of control was found between the pre-test and
follow-up, as well as between the post-test and follow-up using a significance of .05.
Gender was found to have made no difference in composite ROPELOC scores.
Participants in the LIFT summer program have increased self-perceptions of life
effectiveness at the immediate conclusion of the program. The degree of significance has
yet to be determined, and the length of significance is still in question. Researchers
maintain that positive youth development is a complex myriad of interventions. Positive
youth development has taken a proactive shift to promote healthy development outcomes
for all youth, in addition to reducing long-term negative outcomes of at-risk youth and
has emerged into its own as an independent field of study. In addition, positive youth
development is resulting from the combination of several factors that lead to the
development of more comprehensive models and the development of programs which
address multiple behaviors and that involve families and community.
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Ing, Jong Yun, and 鍾雲鶯. "A study of the Life of Wang Juei Yi and the concept of "Lii Tian " in His"Lii Shuh Her Jiee"." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/23982287467467578066.
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師雲儀. "Life grasps life-Re-search into Dilthey's hermeneutics of life." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/05044453509447814402.
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Liang, Kai-Han, and 梁凱涵. "Poetic Life/Personal Life－－"Life Narrative" of Modern Taiwanese Poets." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/us8qw7.
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