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Van, Slingerland Krista. "Design, Implementation, and Evaluation of a Sport-Focused Mental Health Service Delivery Model Within a Canadian Centre for Mental Health and Sport." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42792.
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The overall aim of this Participatory Action Research (PAR; Chevalier & Buckles, 2013; Lewin, 1946) project was to design, implement, and evaluate a specialized sport-focused mental health service delivery model for competitive and high-performance athletes, integrated within a broader Canadian Centre for Mental Health and Sport (CCMHS). A transformative mixed methods research design (Cresswell, 2014) guided by the PAR approach was employed across three phases during which (a) a sport-specific mental health service delivery model for competitive and high-performance athletes was collaboratively designed by stakeholders (Design Phase [Study 1]), (b) the model was pilot-tested within the CCMHS (Implementation Phase [Study 2]), and (c) the model was evaluated to understand whether practitioners and service-users perceived the care delivered / received within the model to be acceptable and appropriate (Evaluation Phase [Study 3]). Design Phase (Study 1). The purpose of study 1 was to (a) perform an environmental scan of the Canadian mental health care and sport contexts, and (b) design a sport-focused mental health service delivery model for competitive and high-performance athletes within a broader CCMHS. To meet these objectives, 20 stakeholders from the sport and mental health sectors explored (a) the availability and effectiveness of mental health care for competitive and high-performance Canadian athletes, and (b) the strengths, weaknesses, opportunities and threats associated with creating a CCMHS, via two iterations of stakeholder-led focus groups (Rio-Roberts, 2011). The resulting data informed a subsequent Group Concept Mapping (GCM; Burke et al., 2005; Kane & Trochim, 2007; Rosas & Kane, 2012) activity undertaken by stakeholders, which produced an actionable framework (i.e., concept map) organized into six clusters that visually represented the elements (e.g., services, personnel, organizational structures) that stakeholders deemed important to include in the sport-focused mental health care model (e.g., bilingual services, a triage system, sport-specialized practitioners). In addition, the results revealed that misconceptions about the competitive and high-performance population’s mental health and experience of mental illness were widespread and required clarification before significant advances could be made. This led the group to develop six principles designed to establish a common language and understanding upon which to build effective models of mental health care, improved programming, and strategic education for Canada’s competitive and high-performance athletes, coaches, and organizations (Article 1). The framework that emerged from the GCM activity served to guide the remainder of the project, and supported actions (e.g., develop eligibility criteria to access services, hire a team of mental health practitioners with sport competencies [i.e., CCMHS Care Team]) to build the CCMHS and test the model during the Implementation Phase (Article 2). Implementation Phase (Study 2). The purpose of study 2 was to pilot test the mental health service delivery model designed during the first phase of the research project. To do so, an illustrative case study (Keegan et al., 2017; Stake, 1995, 2005) was carried out to demonstrate how (i.e., intake, referral, and service delivery processes) the CCMHS Care Team provided mental health care to a high-performance athlete, and what outcomes resulted from this process. Data to inform the case study was gathered through a review of the service-user’s clinical documents (e.g., intake summary, session notes), and qualitative interviews (n = 2) with the athlete’s Collaborative Care Team lead and the CCMHS Care Coordinator. Document analysis (Bowen, 2009) was used to organize the details of the case found within clinical documents under the categories of the case study framework (i.e., intake and referral process, service-user description, integrated care plan, and outcomes), while a conventional descriptive content analysis (Hsieh & Shannon, 2005) served to extract salient data from the interviews to further build out the case study. Results revealed that sport significantly influenced the onset and experience of mental illness for the athlete service-user. The lead practitioner’s sport-specific knowledge played a significant role in the diagnosis, treatment and recovery of this athlete given the nature of the athlete’s concerns and high athletic identity. Findings support the notion that specialized mental health care models and teams are necessary to address sport-related factors that can pose unique threats to the diagnosis and treatment of mental illness in athletes (Article 3). Implementation Phase (Study 3). The purpose of study 3 was to evaluate the acceptability and appropriateness of the mental health service delivery model designed during Phase 1 and implemented during Phase 2. Qualitative data from three sources (CCMHS practitioners, CCMHS service-users, and CCMHS stakeholders) were collected and analyzed using a multi-step, multi-method process, including16 one-on-one semi-structured interviews with CCMHS practitioners (n = 10) and service-users (n = 6), and a meeting with CCMHS stakeholders (captured via meeting minutes). In addition, 47 documents (e.g., clinical, procedural) created during the implementation phase of the project by CCMHS team members (i.e., practitioners, stakeholders, members of the board of directors) were used to triangulate the other data (Carter, Bryant-Lukosius, DiCenso, Blythe, and Neville, 2014). The Framework Method (Gale et al., 2013; Ritchie and Spencer, 1994) was used to analyze, synthesize, integrate, and interpret the dataset. The deductive data analysis approach taken was guided by the seven components of acceptability developed by Sekhon and colleagues (2017), and the Canadian Medical Association’s definition of appropriate care. Findings showed that the care provided and received within the CCMHS service delivery model was perceived to be acceptable and appropriate, and each component of the model uniquely contributed to practitioner and service-user experiences. For example, the collaborative interdisciplinary approach contributed to the ethicality of the model, promoted the professional development of team members, and enabled Pan-Canadian service provision. The sport-centered nature of care was perceived to enhance the ethicality of services delivered, effectiveness of care, and affective experience of service-users. Implications for further research and practice were discussed in light of areas of the model that emerged as needing improvement (e.g., prohibitive cost of care, practitioner burden from collaborative processes and procedures). Overall, the findings of the research project demonstrate that collaborative approaches to inquiry and practice can be successfully applied in sport to guide stakeholders in developing and testing novel models to improve the health outcomes of sport participants. The research also shows that an interdisciplinary team of practitioners can successfully deliver sport-focused mental health care that is acceptable and appropriate to service-users. Lastly, the project provides data on the first known empirical project to design, implement and evaluate a specialized mental health service delivery model applied nationwide in person and virtually with competitive and high-performance athletes experiencing mental health challenges and symptoms of mental illness.
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Toftesund, Hans Christian, and Emil Johan Oliver. "Collaboration in research centres : How firms benefit from collaborating in Centres for Environment-friendly Energy Research." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for industriell økonomi og teknologiledelse, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26090.
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This thesis aims answer how knowledge intensive firms benefit from collaborating in research centres, which is based on our desire to study Norwegian Centres for Environmentally Friendly Energy Research (CEER) where several research institutions and firms are involved. The study is applies the field of knowledge management, and the most central theories covered in this thesis are related to knowledge management, knowledge integration, proximity and information and communication technologies (ICTs). We have employed a qualitative research strategy and designed a single-case study of the CEER Solar United. A total of 20 interviews were conducted, where the interviewees were representatives from 12 current and previous industry partners, in addition to 4 out of 5 research partners in Solar United, using thematic analysis. Our theoretical foundation is framework which was based on a literature review conducted in the fall of 2013. From this theoretical framework, we created four sub-research questions that have been applied in the discussion in order to answer our main research question. We presented empirical data for further discussion, explaining how Solar United operates as an organization as well as challenges in having partners which are geographically spread.The insight we gained through answering our sub-research questions were used to answer the main research question. Our conclusions are that large firms with funds for R&D have the research partners develop firm-specific competence which is later applied in binary research projects. Smaller firms with lower R&D capacity conduct research that advances their technological development within the research centre. Supporting industry partners primarily benefit by gaining insight into the state-of-the-art as well as customer insight. Thus, all industry partners benefit from different kinds of knowledge creation.These findings are constituted in a model which we suggest should be validated through further research on other research centres. The thesis is ended by pointing out theoretical and practical implications, as well as proposals for further research.
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Kissinger, Thomas, Benjamin Schlegel, Dirk Habich, and Wolfgang Lehner. "QPPT: Query Processing on Prefix Trees." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-113269.
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Modern database systems have to process huge amounts of data and should provide results with low latency at the same time. To achieve this, data is nowadays typically hold completely in main memory, to benefit of its high bandwidth and low access latency that could never be reached with disks. Current in-memory databases are usually columnstores that exchange columns or vectors between operators and suffer from a high tuple reconstruction overhead. In this paper, we present the indexed table-at-a-time processing model that makes indexes the first-class citizen of the database system. The processing model comprises the concepts of intermediate indexed tables and cooperative operators, which make indexes the common data exchange format between plan operators. To keep the intermediate index materialization costs low, we employ optimized prefix trees that offer a balanced read/write performance. The indexed tableat-a-time processing model allows the efficient construction of composed operators like the multi-way-select-join-group. Such operators speed up the processing of complex OLAP queries so that our approach outperforms state-of-the-art in-memory databases.
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Baier, Christel, Benjamin Engel, Sascha Klüppelholz, Steffen Märcker, Hendrik Tews, and Marcus Völp. "A Probabilistic Quantitative Analysis of Probabilistic-Write/Copy-Select." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-129917.
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Probabilistic-Write/Copy-Select (PWCS) is a novel synchronization scheme suggested by Nicholas Mc Guire which avoids expensive atomic operations for synchronizing access to shared objects. Instead, PWCS makes inconsistencies detectable and recoverable. It builds on the assumption that, for typical workloads, the probability for data races is very small. Mc Guire describes PWCS for multiple readers but only one writer of a shared data structure. In this paper, we report on the formal analysis of the PWCS protocol using a continuous-time Markov chain model and probabilistic model checking techniques. Besides the original PWCS protocol, we also considered a variant with multiple writers. The results were obtained by the model checker PRISM and served to identify scenarios in which the use of the PWCS protocol is justified by guarantees on the probability of data races. Moreover, the analysis showed several other quantitative properties of the PWCS protocol.
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Pfennig, Stefan, and Elke Franz. "Secure Network Coding: Dependency of Efficiency on Network Topology." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-128456.
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Network Coding is a new possibility to transmit data through a network. By combining different packets instead of simply forwarding, network coding offers the opportunity to reach the Min-Cut/Max-Flow capacity in multicast data transmissions. However, the basic schemes are vulnerable to so-called pollution attacks, where an attacker can jam large parts of the transmission by infiltrating only one bogus message. In the literature we found several approaches which aim at handling this kind of attack with different amounts of overhead. Though, the cost for a specific secure network coding scheme highly depends on the underlying network. The goal of this paper is on the one hand to describe which network parameters influence the efficiency of a certain scheme and on the other hand to provide concrete suggestions for selecting the most efficient secure network coding scheme considering a given network. We will illustrate that there does not exist “the best” secure network scheme concerning efficiency, but all selected schemes are more or less suited under certain network topologies.
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Vorländer, Hans. "Transzendenz und Gemeinsinn: Themen und Perspektiven des Dresdner Sonderforschungsbereichs 804." Technische Universität Dresden, 2011. https://tud.qucosa.de/id/qucosa%3A26300.
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VORWORT: Ikonisch verdichtet sich auf dem Umschlag dieser Broschüre das Selbstbild Dresdens. Von der Brühlschen Terrasse, „Balkon Europas“ genannt, geht der Blick auf die Kunstakademie, mit der gläsernen Kuppel des Kunstvereins, die mit einer eigenartigen Figur an ihrer Spitze besetzt ist, die sich beim näheren Hinsehen als Chimäre aus Nike und Fama zu erkennen gibt. Auf dem Sockel in der Bildmitte steht Gottfried Semper, der jene Oper baute, die heute medial auch als „das schönste Brauhaus Deutschlands“ bekannt ist. Und am hinteren Bildrand werden das neu errichtete Coselpalais, benannt nach der berühmten Mätresse August des Starken, und die wiedererrichtete Frauenkirche sichtbar. Sie ist das Stein gewordene Symbol für die Rekonstruktion des „alten“ Dresden und zugleich Objekt eines neu-alten Bürgerstolzes.
Betrachtet man dieses Bild, mag es verständlich erscheinen, dass manche sagen, Dresden sei gar keine Stadt, sondern ein Mythos. Indes, so wäre zu entgegnen, macht der Mythos erst die Stadt. „Elbflorenz“ – das ist die Erzählung von barocker Schönheit, Liebe zur Kunst und Prunk der alten Residenz. Es ist ein Erinnerungsmythos, zugleich aber auch ein Mythos der Wiederbegründung. Zwischen beide schiebt sich der Mythos des Opfers: die Zerstörung Dresdens am 13. und 14. Februar 1945.
In den Konflikten um die Kirchen- und die Stadtrekonstruktion, um die Restituierung von räumlicher Mitte und urbaner Identität, hat sich eine die Bürgerschaft mobilisierende Energie zu erkennen gegeben. Sie hat es vermocht, dass mehr als drei Viertel der Kosten für den Wiederaufbau der Kirche von privaten Geldgebern gespendet wurde. Zugleich hat diese gemeinsinnige Kraft aber auch bei der Bebauung der die Frauenkirche umgebenden Brachen zu einer Emphase historistischer Rekonstruktionstreue auf dem Neumarkt geführt. In der Erzählung von Zerstörung und Wiederauferstehung verschränken sich mithin mythische Eigentranszendierung der Stadt und aktuelle Gemeinsinnsbehauptungen in einer höchst spannungsvollen Weise.
Dresden illustriert die Fragestellung des Sonderforschungsbereichs, der in dieser Stadt auch seinen Sitz hat. Der Sonderforschungsbereich 804 „Transzendenz und Gemeinsinn“ wurde im Mai 2009 von der Deutschen Forschungsgemeinschaft bewilligt und besteht seit dem 1. Juli 2009 an der Technischen Universität Dresden. Er umfasst 20 Teilprojekte aus drei Fakultäten und neun Instituten der TU Dresden sowie von Partnern der italienischen Universitäten Turin und Matera und der Universität Zürich, Schweiz. Zudem besitzt der SFB 804 ein Integriertes Graduiertenkolleg zur Ausbildung von Doktoranden und internationalen Stipendiaten. Das Forschungsprogramm sieht vor, jenseits herkömmlicher Epocheneinteilungen Ordnungsformationen wie Stadt, Republik, Demokratie, Nation, bürgerliche Gesellschaft, Adel und Hof, religiöse und nicht-religiöse Gemeinschaften miteinander zu vergleichen. Stets geht es um die Analyse des spannungsvollen Zusammenspiels von Transzendenzformen und Gemeinsinnsvorstellungen bei Entstehung, Stabilisierung und Scheitern von vormodernen und modernen sozialen und politischen Ordnungen. Mit dieser interdisziplinär und international vernetzten Fragestellung setzt der SFB 804 die erfolgreiche Grundlagenforschung der Dresdner Geistes-, Sozial- und Kulturwissenschaften fort, die in der zweiten Hälfte der 1990er Jahre mit dem Sonderforschungsbereich 537 „Institutionalität und Geschichtlichkeit“ und einem Internationalen Graduiertenkolleg begonnen hat.
Die folgenden Seiten beabsichtigen, den gemeinsamen Forschungsansatz und die Ziele der einzelnen Projekte des SFB 804 der wissenschaftlichen und interessierten Öffentlichkeit vorzustellen. Sie möchten auch zu Anregung und Auseinandersetzung einladen.:6 Hans Vorländer: Einleitung
16 Maria Häusl: Trennung und Öffnung. Alttestamentarische Diskurse um die Konstituierung des nachexilischen Israel
22 Matthias Klinghardt: Mahl und Kanon. Gemeinschaftsbildung im frühen Christentum
28 Martin Jehne: Die Investition eigener Ressourcen in die Gemeinschaft von der mittleren Republik bis in die hohe Kaiserzeit
34 Fritz-Heiner Mutschler: Tradition, Vernunft, Gott. Zur wechselnden Fundierung gemeinsinnigen Handelns vom Ausgang der Republik bis in die Umbruchphase des 3. Jahrhunderts
40 Cristina Andenna/Gert Melville: Dynastie, Idoneität und Transzendenz. Vergleichende Untersuchungen zum hohen und späten Mittelalter
46 Bruno Klein: Die Kirche als Baustelle. Großstädtische Sakralbauten im Mittelalter
52 Jürgen Müller: Das subversive Bild. Religiöse und profane Deutungsmuster in der Kunst der Frühen Neuzeit
58 Gerd Schwerhoff: Gottlosigkeit und Eigensinn. Religiöse Devianz in der Frühen Neuzeit
64 Winfried Müller: Gemeinsinnsdiskurse und religiöse Prägung zwischen Spätaufklärung und Vormärz (ca. 1770 - ca. 1848)
70 Hans Vorländer: Demokratische Ordnung zwischen Transzendenz und Gemeinsinn
76 Werner J. Patzelt: Transzendenz und Gemeinsinn als Ressourcen politischer Ordnungskonstruktion
82 Karl-Siegbert Rehberg: Kunstsakralisierung und Gemeinsinn
88 Hans-Georg Lippert: Das Planbare und das Unverfügbare. Modelle von Transzendenz und Gemeinsinn in Architektur und Städtebau im 20. Jahrhundert
94 Thomas Hänseroth: Das Fortschrittsversprechen von Technik und die Altruismusbehauptung der Ingenieure in der technokratischen Hochmoderne (ca. 1880 - 1970)
100 Christian Schwarke: Konstruktionen von Transzendenz und Gemeinsinn in Technik und Theologie
106 Karl Lenz: Transzendenz und Gemeinsinn in privaten Lebensformen
112 Thomas Rentsch: Transzendenz und Gemeinsinn in Geschichte und Gegenwart der Philosophie
118 Pier Paolo Portinaro: Die Sakralisierung der Kulturnation im italienischen Risorgimento
124 Georg Kohler: Die Kontingenz des Unverfügbaren - Die „Willensnation Schweiz“
130 Marina Münkler: Das Ethos der Freundschaft
136 Gerd Schwerhoff: Integriertes Graduiertenkolleg
138 Kontakt und Impressum
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Hall, William D. (William David) 1968. "Efficient capacity allocation in a collaborative air transportation system." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/8786.
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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, Operations Research Center, 1999.<br>Includes bibliographical references (p. 177-180).<br>This thesis proposes methods of allocating airport capacity to the users of the National Airspace System (NAS) during periods in which demand for the resources exceeds capacity. A metric by which the proposed methods are judged is the value that the users of the N AS are able to realize through the allocation. Maximization of this metric produces notably different results from minimization of flight-minutes of delay and similar objectives employed in related works. The heart of this approach is the treatment of the Federal Aviation Administration (FAA) and the NAS users as solvers of subproblems in a decomposition of the overall problem of determining how to operate the system. The best possible capacity allocation method would allow the users, to achieve the same result collectively that a single omniscient entity in control of all decisions in the system could achieve. The typical approach to decomposition employed in optimization, that of modifying the subproblem objectives through a penalty function determined by a master "dual" problem, is employed in the Objective-Based Allocation Method (OBAM). It is shown that the proper choice of penalty function results in a method that performs well dynamically and, assuming each user operates to maximize its operating objectives through the allocation, achieves the optimal solution that an omniscient single controller would achieve. OBAM requires complete communication of user objectives and constraints to achieve optimality. It also requires that the penalty functions used to coordinate the subproblem solutions be added to the user objective functions through assessment of fees. The second part of this thesis addresses the improvement of the decomposition by changing the nature of the allocation without these requirements. Rather than allocate airport arrival capacity alone, a more general notion of airport capacity that captures the interactions between arrival and departure processes at an airport is allocated. This allows the users the flexibility to adjust the operations mix of the airport according to their objectives and improves the ability of the system to match demand to forecast airport capacity. Through simulation, it is shown that this approach could improve significantly on the primary metric of achieving user value. In addition, the approach facilitates side benefits, such as the reduction of fuel consumption, the reduction of harmful emissions into the environment, and the improvement of service reliability for the flying public.<br>by William D. Hall.<br>Ph.D.
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Hähnel, Marcus, Björn Döbel, Marcus Völp, and Hermann Härtig. "Measuring energy consumption for short code paths using RAPL." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-113258.
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Measuring the energy consumption of software components is a major building block for generating models that allow for energy-aware scheduling, accounting and budgeting. Current measurement techniques focus on coarse-grained measurements of application or system events. However, fine grain adjustments in particular in the operating-system kernel and in application-level servers require power profiles at the level of a single software function. Until recently, this appeared to be impossible due to the lacking fine grain resolution and high costs of measurement equipment. In this paper we report on our experience in using the Running Average Power Limit (RAPL) energy sensors available in recent Intel CPUs for measuring energy consumption of short code paths. We investigate the granularity at which RAPL measurements can be performed and discuss practical obstacles that occur when performing these measurements on complex modern CPUs. Furthermore, we demonstrate how to use the RAPL infrastructure to characterize the energy costs for decoding video slices.
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Engelmann, Sabrina, Zuleita K. M. Ho, and Eduard A. Jorswieck. "Interference Leakage Neutralization in Two-Hop Wiretap Channels with Partial CSI." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-128438.
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In this paper, we analyze the four-node relay wiretap channel, where the relay performs amplify-and-forward. There is no direct link between transmitter and receiver available. The transmitter has multiple antennas, which assist in securing the transmission over both phases. In case of full channel state information (CSI), the transmitter can apply information leakage neutralization in order to prevent the eavesdropper from obtaining any information about the signal sent. This gets more challenging, if the transmitter has only an outdated estimate of the channel from the relay to the eavesdropper. For this case, we optimize the worst case secrecy rate by choosing intelligently the beamforming vectors and the power allocation at the transmitter and the relay.
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Malasky, Jeremy S. "Human machine collaborative decision making in a complex optimization system." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32514.
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Thesis (S.M.)--Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2005.<br>Includes bibliographical references (p. 149-151).<br>Numerous complex real-world applications are either theoretically intractable or unable to be solved in a practical amount of time. Researchers and practitioners are forced to implement heuristics in solving such problems that can lead to highly sub-optimal solutions. Our research focuses on inserting a human "in-the-loop" of the decision-making or problem solving process in order to generate solutions in a timely manner that improve upon those that are generated either scolely by a human or solely by a computer. We refer to this as Human-Machine Collaborative Decision-Making (HMCDM). The typical design process for developing human-machine approaches either starts with a human approach and augments it with decision-support or starts with an automated approach and augments it with operator input. We provide an alternative design process by presenting an 1HMCDM methodology that addresses collaboration from the outset of the design of the decision- making approach. We apply this design process to a complex military resource allocation and planning problem which selects, sequences, and schedules teams of unmanned aerial vehicles (UAVs) to perform sensing (Intelligence, Surveillance, and Reconnaissance - ISR) and strike activities against enemy targets. Specifically, we examined varying degrees of human-machine collaboration in the creation of variables in the solution of this problem. We also introduce an IIHMCDM method that combines traditional goal decomposition with a model formulation into an Iterative Composite Variable Approach for solving large-scale optimization problems.<br>(cont.) Finally, we show through experimentation the potential for improvement in the quality and speed of solutions that can be achieved through the use of an HMCDM approach.<br>by Jeremy S. Malasky.<br>S.M.
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Keyserlingk, Linda von. "Akademische Forschung und universitäre Sammlungen." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-111314.
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Die zweite Sektion begann am 4. Oktober mit einem einführenden Vortrag von Klaus Mauersberger über die Entwicklung, die Bewahrung und die Spezifik der Sammlungen der TU Dresden. Mauersberger, langjähriger Mitarbeiter am Zentrum für Geschichte der Technikwissenschaften und seit 1993 Leiter der Kustodie der TU Dresden, gab einen Überblick über die Anfänge, die Aufgaben sowie den Umfang und die Diversität der Dresdner Universitätssammlungen. (...)
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Lehner, Wolfgang. "Energy-Efficient In-Memory Database Computing." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-115547.
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The efficient and flexible management of large datasets is one of the core requirements of modern business applications. Having access to consistent and up-to-date information is the foundation for operational, tactical, and strategic decision making. Within the last few years, the database community sparked a large number of extremely innovative research projects to push the envelope in the context of modern database system architectures. In this paper, we outline requirements and influencing factors to identify some of the hot research topics in database management systems. We argue that—even after 30 years of active database research—the time is right to rethink some of the core architectural principles and come up with novel approaches to meet the requirements of the next decades in data management. The sheer number of diverse and novel (e.g., scientific) application areas, the existence of modern hardware capabilities, and the need of large data centers to become more energy-efficient will be the drivers for database research in the years to come.
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Fettweis, Gerhard P., Hassan Najeeb ul, Lukas Landau, and Erik Fischer. "Wireless Interconnect for Board and Chip Level." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-118302.
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Electronic systems of the future require a very high bandwidth communications infrastructure within the system. This way the massive amount of compute power which will be available can be inter-connected to realize future powerful advanced electronic systems. Today, electronic inter-connects between 3D chip-stacks, as well as intra-connects within 3D chip-stacks are approaching data rates of 100 Gbit/s soon. Hence, the question to be answered is how to efficiently design the communications infrastructure which will be within electronic systems. Within this paper approaches and results for building this infrastructure for future electronics are addressed.
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Pfennig, Stefan, and Elke Franz. "Comparison of Different Secure Network Coding Paradigms Concerning Transmission Efficiency." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-145096.
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Preventing the success of active attacks is of essential importance for network coding since even the infiltration of one single corrupted data packet can jam large parts of the network. The existing approaches for network coding schemes preventing such pollution attacks can be divided into two categories: utilize cryptographic approaches or utilize redundancy similar to error correction coding. Within this paper, we compared both paradigms concerning efficiency of data transmission under various circumstances. Particularly, we considered an attacker of a certain strength as well as the influence of the generation size. The results are helpful for selecting a suitable approach for network coding taking into account both security against pollution attacks and efficiency.
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Baier, Christel, Marcus Daum, Benjamin Engel, et al. "Chiefly Symmetric: Results on the Scalability of Probabilistic Model Checking for Operating-System Code." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-121319.
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Reliability in terms of functional properties from the safety-liveness spectrum is an indispensable requirement of low-level operating-system (OS) code. However, with evermore complex and thus less predictable hardware, quantitative and probabilistic guarantees become more and more important. Probabilistic model checking is one technique to automatically obtain these guarantees. First experiences with the automated quantitative analysis of low-level operating-system code confirm the expectation that the naive probabilistic model checking approach rapidly reaches its limits when increasing the numbers of processes. This paper reports on our work-in-progress to tackle the state explosion problem for low-level OS-code caused by the exponential blow-up of the model size when the number of processes grows. We studied the symmetry reduction approach and carried out our experiments with a simple test-and-test-and-set lock case study as a representative example for a wide range of protocols with natural inter-process dependencies and long-run properties. We quickly see a state-space explosion for scenarios where inter-process dependencies are insignificant. However, once inter-process dependencies dominate the picture models with hundred and more processes can be constructed and analysed.
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Pfennig, Stefan, and Elke Franz. "Comparison of Different Secure Network Coding Paradigms Concerning Transmission Efficiency." Technische Universität Dresden, 2013. https://tud.qucosa.de/id/qucosa%3A28134.
Full textAbstract:
Preventing the success of active attacks is of essential importance for network coding since even the infiltration of one single corrupted data packet can jam large parts of the network. The existing approaches for network coding schemes preventing such pollution attacks can be divided into two categories: utilize cryptographic approaches or utilize redundancy similar to error correction coding. Within this paper, we compared both paradigms concerning efficiency of data transmission under various circumstances. Particularly, we considered an attacker of a certain strength as well as the influence of the generation size. The results are helpful for selecting a suitable approach for network coding taking into account both security against pollution attacks and efficiency.
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Wendisch, Manfred, Marlen Brückner, John P. Burrows, et al. "Introduction of the Transregional Collaborative Research Center TR 172: Arctic Amplification." Universität Leipzig, 2017. https://ul.qucosa.de/id/qucosa%3A16739.
Full textAbstract:
A new German research consortium is investigating the causes and effects of the rapid rise of near-surface air temperatures in the Artic. Within the last 25 years a remarkable increase of the Arctic near-surface air temperature exceeding the global warming by a factor of two to three has been observed. The phenomenon is commonly referred to as Arctic Amplification. The warming results in rather drastic changes of a variety of climate parameters. For example, the Arctic sea ice has declined significantly. This ice retreat has been well identified by satellite measurements. However, coupled regional and global climate models still fail to reproduce it adequately; they tend to systematically underestimate the observed sea ice decline. This model observation difference implies that the underlying physical processes and feedback mechanisms are not appropriately represented in Arctic climate models. Thus, the predictions of these models are also likely to be inadequate. It is mandatory to identify the origin of this disagreement.<br>Ein neu geschaffenes deutsches Forschungskonsortium untersucht die Ursachen und Effekte des rapiden Anstiegs der bodennahen Lufttemperatur in der Arktis. Innerhalb der letzten 25 Jahre wurde ein bemerkenswerter Anstieg der Bodenlufttemperatur in der Arktis beobachtet, welcher die globale Erwärmung um den Faktor 2 bis 3 übersteigt. Dieses Phänomen wird als arktische Verstärkung bezeichnet. Diese Erwärmung resultiert vielmehr in einer drastischen Änderung einer Vielzahl von Klimarparametern. Beispielsweise ist das arktische Meereis deutlich zurückgegangen. Dieser Eisrückgang wurde durch Satellitenbeobachtungen gut beobachtet. Dagegen haben regionale und globale Klimamodelle immer noch Probleme, den Rückgang entsprechend zu reproduzieren. Sie tendieren dazu, den Meereisrückgang systematisch zu unterschätzen. Die Unterschiede zwischen Modell und Beobachtungen legen nahe, dass die grundlegenden physikalischen Prozesse und Rückkopplungsmechanismen nicht entsprechend in arktischen Klimamodellen repräsentiert werden. Somit sind wahrscheinlich auch die Vorhersagen der Modelle unzureichend. Es ist notwendig, den Ursprung dieser Unstimmigkeit zu identifizieren.
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Gupta, Shubham Ph D. Massachusetts Institute of Technology. "A tractable optimization framework for Air Traffic Flow Management addressing fairness, collaboration and stochasticity." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/72644.
Full textAbstract:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2012.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 151-154).<br>We propose a tractable optimization framework for network Air Traffic Flow Management (ATFM) with an eye towards the future. The thesis addresses two issues in ATFM research: a) fairness and collaboration amongst airlines; and b) uncertainty inherent in capacity forecasts. A unifying attraction of the overall dissertation is that the Collaborative Decision-Making (CDM) paradigm, which is the current philosophy governing the design of new ATFM initiatives, is treated as the starting point in the research agenda. In the first part of the thesis, we develop an optimization framework to extend the CDM paradigm from a single-airport to a network setting by incorporating both fairness and airline collaboration. We introduce different notions of fairness emanating from a) First-Scheduled First-Served (FSFS) fairness; and b) Proportional fairness. We propose exact discrete optimization models to incorporate them. The first fairness paradigm which entails controlling number of reversals and total amount of overtaking is especially appealing in the ATFM context as it is a natural extension of Ration-By-Schedule (RBS). We allow for further airline collaboration by proposing discrete optimization models for slot reallocation. We provide empirical results of the proposed optimization models on national-scale, real world datasets that show interesting tradeoffs between fairness and efficiency. In particular, schedules close to the RBS policy (with single digit reversals) are possible for a less than 10% increase in delay costs. We utilize case studies to highlight the considerable improvements in the internal objective functions of the airlines as a result of slot exchanges. Finally, the proposed models are computationally tractable (running times of less than 30 minutes). In the second part, we address the important issue of capacity uncertainty by presenting the first application of robust and adaptive optimization in the ATFM problem. We introduce a weather-front based approach to model the uncertainty inherent in airspace capacity estimates resulting from the impact of a small number of weather fronts. We prove the equivalence of the robust problem to a modified instance of the deterministic problem; solve the LP relaxation of the adaptive problem using affine policies; and report extensive empirical results to study the inherent tradeoffs.<br>by Shubham Gupta.<br>Ph.D.
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Kissinger, Thomas, Benjamin Schlegel, Matthias Böhm, Dirk Habich, and Wolfgang Lehner. "A high-throughput in-memory index, durable on flash-based SSD." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-105947.
Full textAbstract:
Growing memory capacities and the increasing number of cores on modern hardware enforces the design of new in-memory indexing structures that reduce the number of memory transfers and minimizes the need for locking to allow massive parallel access. However, most applications depend on hard durability constraints requiring a persistent medium like SSDs, which shorten the latency and throughput gap between main memory and hard disks. In this paper, we present our winning solution of the SIGMOD Programming Contest 2011. It consists of an in-memory indexing structure that provides a balanced read/write performance as well as non-blocking reads and single-lock writes. Complementary to this index, we describe an SSD-optimized logging approach to fit hard durability requirements at a high throughput rate.
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Baier, Christel, Marcus Daum, Benjamin Engel, et al. "Chiefly Symmetric: Results on the Scalability of Probabilistic Model Checking for Operating-System Code." Technische Universität Dresden, 2012. https://tud.qucosa.de/id/qucosa%3A27132.
Full textAbstract:
Reliability in terms of functional properties from the safety-liveness spectrum is an indispensable requirement of low-level operating-system (OS) code. However, with evermore complex and thus less predictable hardware, quantitative and probabilistic guarantees become more and more important. Probabilistic model checking is one technique to automatically obtain these guarantees. First experiences with the automated quantitative analysis of low-level operating-system code confirm the expectation that the naive probabilistic model checking approach rapidly reaches its limits when increasing the numbers of processes. This paper reports on our work-in-progress to tackle the state explosion problem for low-level OS-code caused by the exponential blow-up of the model size when the number of processes grows. We studied the symmetry reduction approach and carried out our experiments with a simple test-and-test-and-set lock case study as a representative example for a wide range of protocols with natural inter-process dependencies and long-run properties. We quickly see a state-space explosion for scenarios where inter-process dependencies are insignificant. However, once inter-process dependencies dominate the picture models with hundred and more processes can be constructed and analysed.
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Kern, Lisa. "Datenbanken, Inventarisierung, Provenienzforschung." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-111327.
Full textAbstract:
Die dritte Sektion der Dresden Summer School behandelte die für die wissenschaftliche Arbeit am Museum zentralen Aspekte Datenbanken, Inventarisierung und Provenienzforschung. Alle diese Punkte sind eng mit dem Thema Digitalisierung verbunden, greifen die genannten Arbeitsbereiche doch mittlerweile standardmäßig auf Datenbanken und elektronische Systeme zur Erfassung, Dokumentation und Erforschung der musealen Bestände zurück. (...)
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Küster, Kerstin, and Felicitas von Mallinckrodt. "Exkursion ins Museum der deutschsprachigen Bewohner der böhmischen Länder in Ústí nad Labem (Aussig)." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-111350.
Full textAbstract:
Werden normalerweise neue Museen für bereits bestehende Sammlungen gebaut, so verkehrt sich in Ústí nad Labem dieses Prinzip ins Gegenteil. Auf Initiative des Collegium Bohemicum und unterstützt von der Jan Evangelista Purkyně-Universität Ústí nad Labem wurde 2006 das „Museum für die deutschsprachigen Bewohner der böhmischen Länder“ ins Leben gerufen. Das im Aufbau befindliche Museum hat sich zum Ziel gesetzt, das Wirken und den Beitrag der deutschsprachigen Bewohner in den böhmischen Ländern aus tschechischer Perspektive, aber in europäische Zusammenhänge eingebettet darzustellen und zu vermitteln. (...)
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Hassan, Najeeb ul, Ali E. Pusane, Michael Lentmaier, Gerhard P. Fettweis, and Daniel J. Costello. "Reduced Complexity Window Decoding Schedules for Coupled LDPC Codes." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-105936.
Full textAbstract:
Window decoding schedules are very attractive for message passing decoding of spatially coupled LDPC codes. They take advantage of the inherent convolutional code structure and allow continuous transmission with low decoding latency and complexity. In this paper we show that the decoding complexity can be further reduced if suitable message passing schedules are applied within the decoding window. An improvement based schedule is presented that easily adapts to different ensemble structures, window sizes, and channel parameters. Its combination with a serial (on-demand) schedule is also considered. Results from a computer search based schedule are shown for comparison.
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Richter, Johannes, Elke Franz, Sabrina Engelmann, Stefan Pfennig, and Eduard A. Jorswieck. "Physical Layer Security vs. Network Layer Secrecy: Who Wins on the Untrusted Two-Way Relay Channel?" Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-145086.
Full textAbstract:
We consider the problem of secure communications in a Gaussian two-way relay network where two nodes exchange confidential messages only via an untrusted relay. The relay is assumed to be honest but curious, i.e., an eavesdropper that conforms to the system rules and applies the intended relaying scheme. We analyze the achievable secrecy rates by applying network coding on the physical layer or the network layer and compare the results in terms of complexity, overhead, and efficiency. Further, we discuss the advantages and disadvantages of the respective approaches.
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Kissinger, Thomas, Benjamin Schlegel, Matthias Böhm, Dirk Habich, and Wolfgang Lehner. "A high-throughput in-memory index, durable on flash-based SSD: Insights into the winning solution of the SIGMOD programming contest 2011." Technische Universität Dresden, 2012. https://tud.qucosa.de/id/qucosa%3A26635.
Full textAbstract:
Growing memory capacities and the increasing number of cores on modern hardware enforces the design of new in-memory indexing structures that reduce the number of memory transfers and minimizes the need for locking to allow massive parallel access. However, most applications depend on hard durability constraints requiring a persistent medium like SSDs, which shorten the latency and throughput gap between main memory and hard disks. In this paper, we present our winning solution of the SIGMOD Programming Contest 2011. It consists of an in-memory indexing structure that provides a balanced read/write performance as well as non-blocking reads and single-lock writes. Complementary to this index, we describe an SSD-optimized logging approach to fit hard durability requirements at a high throughput rate.
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Großmann, Knut. "Tradition und Gegenwart bei der Analyse des thermischen Verhaltens spanender Werkzeugmaschinen: Tagungsband 16. Dresdner Werkzeugmaschinen-Fachseminar, 21. und 22. März 2013 Dresden: Gewidmet dem 100. Geburtstag von Prof. Dr.-Ing. habil. Dr. h.c. Horst Berthold." Technische Universität Dresden, 2013. https://tud.qucosa.de/id/qucosa%3A27057.
Full textAbstract:
Die Dresdner Werkzeugmaschinen-Fachseminare sind ein Forum zu ausgewählten Spezialthemen der Entwicklung und Nutzung von Werkzeugmaschinen.
Das 16. WZM-Fachseminar berichtetet inhaltlich detailliert von aktuellen Arbeiten im Rahmen des DFG-Sonderforschungsbereiches "Thermo-Energetische Gestaltung von Werkzeugmaschinen" (SFB/TR 96) an den Standorten Dresden, Aachen und Chemnitz.
Die Fachbeiträge berichten über experimentelle und modellgestützte Analyse von Wärmequellen und -übertragung in spanenden Werkzeugmaschinen sowie zu Lösungsansätzen zur Korrektur und Kompensation der thermo-elastischen Verlagerungen.:H. P. Schossig DMG, Pfronten: Thermik-Forschung und die Umsetzung der Erkenntnisse in Maschinenkonzepten bei DMG
K. Großmann Sprecher des DFG-SFB Transregio 96 IWM, TU Dresden: Thermo-Energetische Gestaltung von Werkzeugmaschinen
F. Klocke; M. Brockmann WZL, RWTH Aachen, K. Großmann; Ch. Städel IWM, TU Dresden: Untersuchungen des Zerspanungsprozesses hinsichtlich auftretender Wärmeströme und Temperaturen
R. Werner; St. Winkler EWA, TU Chemnitz, Ch. Brecher; D. Haber WZL, RWTH Aachen: Verlustleistungen in einer Vorschubachse und die daraus resultierende Temperaturverteilung
R. Kneer; S. Vieler WSA, RWTH Aachen, K. Großmann; St. Schroeder IWM, TU Dresden: Messungen des Wärmeübergangs an Fugenkontakten von Werkzeugmaschinen
J. Weber; Jul. Weber IFD, TU Dresden, G. Schmidt; U. Semmler Fraunhofer IWU, Chemnitz: Fluidische Kühlung von Motorspindeln und Werkzeugen
W.-G. Drossel; St. Ihlenfeldt; C. Zwingenberger Fraunhofer IWU, Chemnitz, K. Großmann; St. Schroeder IWM, TU Dresden: Modellierung des Wärmeaustauschs Maschine-Umgebung
A. Voigt; J. Wensch; A. Naumann IWR, TU Dresden: Defektkorrektur bei Mittelungsverfahren in der Zeitintegration des Temperaturverhaltens
K. Großmann; A. Galant IWM, TU Dresden, M. Beitelschmidt; M. Partzsch IFKM, TU Dresden: Strukturveränderlichkeit in FEM und Blocksimulation bei der Berechnung von Temperaturfeldern
K. Großmann; M. Merx IWM, TU Dresden: Thermografie und Nahbereichs-Fotogrammetrie zur Erfassung von Temperatur- u. Verlagerungsfeldern
Ch. Brecher; M. Wennemer WZL, RWTH Aachen: Eigenschaftsmodellbasierter Ansatz zur Korrektur thermo-elastischer Verlagerungen
K. Großmann; Ch. Städel IWM, TU Dresden: Simulative Erweiterung der Datenbasis zur korrelativen Korrektur thermo-elastischer Verlagerungen
W.-G. Drossel; Ch. Ohsenbrügge Fraunhofer IWU, Chemnitz: Materialeffekte und Funktionsmechanismen zur Wärmefluss-Steuerung
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Kolb, Lisa Christina. "Kulturelle Gedächtnisinstitutionen und ihre digitale Zukunft." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-111305.
Full textAbstract:
Bereits seit einiger Zeit ist von Seiten kulturgutverwahrender Institutionen ein Aufbruch in Richtung der digitalen Welt zu konstatieren. Eine steigende Anzahl von Tagungen, Publikationen und kulturwissenschaftlichen Studien zu diesem Thema belegt dies.1 Doch welche Umbrüche in den Strukturen, im Denken und in den Strategien sind notwendig, um die digitale Zukunft erfolgreich zu beschreiten? (...)
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Krone, Stefan, and Gerhard Fettweis. "Capacity of Communications Channels with 1-Bit Quantization and Oversampling at the Receiver." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-101462.
Full textAbstract:
Communications receivers that rely on 1-bit analogto-digital conversion are advantageous in terms of hardware complexity and power dissipation. Performance limitations due to the 1-bit quantization can be tackled with oversampling. This paper considers the oversampling gain from an information-theoretic perspective by analyzing the channel capacity with 1-bit quantization and oversampling at the receiver for the particular case of AWGN channels. This includes a numerical computation of the capacity and optimal transmit symbol constellations, as well as the derivation of closed-form expressions for large oversampling ratios and for high signal-to-noise ratios of the channel.
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Baier, Christel, Marcus Daum, Benjamin Engel, et al. "Waiting for Locks: How Long Does It Usually Take?" Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-121259.
Full textAbstract:
Reliability of low-level operating-system (OS) code is an indispensable requirement. This includes functional properties from the safety-liveness spectrum, but also quantitative properties stating, e.g., that the average waiting time on locks is sufficiently small or that the energy requirement of a certain system call is below a given threshold with a high probability. This paper reports on our experiences made in a running project where the goal is to apply probabilistic model checking techniques and to align the results of the model checker with measurements to predict quantitative properties of low-level OS code.
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Richter, Johannes, Elke Franz, Sabrina Engelmann, Stefan Pfennig, and Eduard A. Jorswieck. "Physical Layer Security vs. Network Layer Secrecy: Who Wins on the Untrusted Two-Way Relay Channel?" Technische Universität Dresden, 2013. https://tud.qucosa.de/id/qucosa%3A28133.
Full textAbstract:
We consider the problem of secure communications in a Gaussian two-way relay network where two nodes exchange confidential messages only via an untrusted relay. The relay is assumed to be honest but curious, i.e., an eavesdropper that conforms to the system rules and applies the intended relaying scheme. We analyze the achievable secrecy rates by applying network coding on the physical layer or the network layer and compare the results in terms of complexity, overhead, and efficiency. Further, we discuss the advantages and disadvantages of the respective approaches.
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Ho, Zuleita K. M., and Eduard Jorswieck. "Secure degrees of freedom on widely linear instantaneous relay-assisted interference channel." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-128420.
Full textAbstract:
The number of secure data streams a relay-assisted interference channel can support has been an intriguing problem. The problem is not solved even for a fundamental scenario with a single antenna at each transmitter, receiver and relay. In this paper, we study the achievable secure degrees of freedom of instantaneous relay-assisted interference channels with real and complex coefficients. The study of secure degrees of freedom with complex coefficients is not a trivial multiuser extension of the scenarios with real channel coefficients as in the case for the degrees of freedom, due to secrecy constraints. We tackle this challenge by jointly designing the improper transmit signals and widely-linear relay processing strategies.
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Jorswieck, Eduard A., Anne Wolf, and Sabrina Engelmann. "Secret key generation from reciprocal spatially correlated MIMO channels." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-143998.
Full textAbstract:
Secret key generation from reciprocal multi-antenna channels is an interesting alternative to cryptographic key management in wireless systems without infrastructure access. In this work, we study the secret key rate for the basic source model with a MIMO channel. First, we derive an expression for the secret key rate under spatial correlation modelled by the Kronecker model and with spatial precoding at both communication nodes. Next, we analyze the result for uncorrelated antennas to understand the optimal precoding for this special case, which is equal power allocation. Then, the impact of correlation is characterized using Majorization theory. Surprisingly for small SNR, spatial correlation increases the secret key rate. For high SNR, the maximum secret key rate is achieved for uncorrelated antennas. The results indicate that a solid system design for reciprocal MIMO key generation is required to establish the secret key rate gains.
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Baier, Christel, Marcus Daum, Benjamin Engel, et al. "Waiting for Locks: How Long Does It Usually Take?" Technische Universität Dresden, 2012. https://tud.qucosa.de/id/qucosa%3A27128.
Full textAbstract:
Reliability of low-level operating-system (OS) code is an indispensable requirement. This includes functional properties from the safety-liveness spectrum, but also quantitative properties stating, e.g., that the average waiting time on locks is sufficiently small or that the energy requirement of a certain system call is below a given threshold with a high probability. This paper reports on our experiences made in a running project where the goal is to apply probabilistic model checking techniques and to align the results of the model checker with measurements to predict quantitative properties of low-level OS code.
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Ho, Zuleita K. M., Eduard A. Jorswieck, and Sabrina Engelmann. "Efficient information leakage neutralization on a relay-assisted multi-carrier interference channel." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-128447.
Full textAbstract:
In heterogeneous dense networks where spectrum is shared, users privacy remains one of the major challenges. When the receivers are not only interested in their own signals but also in eavesdropping other users' signals, the cross talk becomes information leakage.We propose a novel and efficient secrecy rate enhancing relay strategy EFFIN for information leakage neutralization. The relay matrix is chosen such that the effective leakage channel (spectral and spatial) is zero. Thus, it ensures secrecy regardless of receive processing employed at eavesdroppers and does not rely on wiretaps codes to ensure secrecy, unlike other physical layer security techniques such as artificial noise. EFFIN achieves a higher sum secrecy rate over several state-of-the-art baseline methods.
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Krone, Stefan, and Gerhard Fettweis. "Communications with 1-Bit Quantization and Oversampling at the Receiver: Benefiting from Inter-Symbol-Interference." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-101473.
Full textAbstract:
1-bit analog-to-digital conversion is very attractive for low-complexity communications receivers. A major drawback is, however, the small spectral efficiency when sampling at symbol rate. This can be improved through oversampling by exploiting the signal distortion caused by the transmission channel. This paper analyzes the achievable data rate of band-limited communications channels that are subject to additive noise and inter-symbol-interference with 1-bit quantization and oversampling at the receiver. It is shown that not only the channel noise but also the inter-symbol-interference can be exploited to benefit from oversampling.
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Hassan, Najeeb ul, Ali E. Pusane, Michael Lentmaier, Gerhard P. Fettweis, and Daniel J. Costello. "Reduced Complexity Window Decoding Schedules for Coupled LDPC Codes." Technische Universität Dresden, 2012. https://tud.qucosa.de/id/qucosa%3A26634.
Full textAbstract:
Window decoding schedules are very attractive for message passing decoding of spatially coupled LDPC codes. They take advantage of the inherent convolutional code structure and allow continuous transmission with low decoding latency and complexity. In this paper we show that the decoding complexity can be further reduced if suitable message passing schedules are applied within the decoding window. An improvement based schedule is presented that easily adapts to different ensemble structures, window sizes, and channel parameters. Its combination with a serial (on-demand) schedule is also considered. Results from a computer search based schedule are shown for comparison.
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Crawford, Cecelia L. "Using a collaborative center for integrative reviews and evidence summaries to narrow the education-practice-research gap." Thesis, Western University of Health Sciences, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3557774.
Full textAbstract:
<p> The overarching purpose of this dissertation project was to design a collaborative center for integrative reviews and evidence summaries (CCIRES) to advance the state of the art and science of nursing knowledge and narrow the education-practice-research gap. The CCIRES program was created as a web-based platform embedded in the Kaiser Permanente Southern California infrastructure. The specific purpose of this project was to implement CCIRES via that infrastructure, and evaluate the implementation, structures, processes, and usability of CCIRES. The Diffusion of Innovations was the theoretical framework, as supported by the Model of Diffusion in Service Organizations and the Colorado Patient-Centered Interprofessional Evidence-Based Practice Model. These theoretical perspectives and models informed the structures and processes for the design, implementation, and evaluation of the CCIRES innovation. The literature captured the history of the education-practice-research gap and the use of translational research to support evidence-based nursing practice. A rigorous methodology involving formative and summative evaluation structured data collection and analyses. Four expert members of CCIRES comprised the sample targeted for voluntary participation in the SWOT web-based survey and construction of a logic model providing the data outcomes. NVIVO was the qualitative software program chosen for SWOT data storage and management. The SWOT analysis identified nine individual themes, with three themes spanning all categories and four themes populating four separate categories. These data results allowed deep examination of the essential core functions needed to achieve CCIRES' goals and succeed as a program. Group consensus during a webinar meeting was the data analysis technique for the construction of the 2012 CCIRES logic model. CCIRES members analyzed the alignment of multiple model components to understand the gaps, commonalities, and interrelated elements needed for a successful academic-service partnership program. Secondary outcomes included increased membership, website design, increased evidence review competencies, development of resources, and tool testing. CCIRES' goal of narrowing the education-practice-research gap facilitates the delivery of meaningful knowledge into the caring hands of professional nurses. CCIRES next bold step is to partner with other influential groups seeking to increase the breadth, depth, and rigor of the evidence. By heeding this call to action, CCIRES can translate, diffuse, and disseminate 21<sup>st</sup> Century nursing knowledge that has meaning for the two people who seek it and need it most—the nurse and the patient.</p>
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Plaeksakul, Akeanong. "Local innovation system and public-private research partnership : a case study of national research centres and a science park in Thailand." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/local-innovation-system-and-publicprivate-research-partnershipa-case-study-of-national-research-centres-and-a-science-park-in-thailand(a01a7ae3-fe29-4b01-a5f5-9395e92b0e5a).html.
Full textAbstract:
This thesis investigates the local innovation system of public research organisations in the Thai context, in which research centres and firms are co-located in a planned science park, with particular emphasis on the influence of co-location on interactions between research centres and local firms, and the research collaboration between the research centres and industrial firms. It aims to gain insight into the factors that influence the interaction of research centres and firms located in close proximity and the ways in which research centres and firms interrelate in relation to their research collaboration. This thesis draws upon three theoretical concepts: the concept of local innovation system, the concept of proximity, and the theories of inter-organisational relationships.The study suggests that co-location (i.e. physical proximity) to research centres does not normally lead to formal interaction between local firms and research centres in this context. Most of the interactions between them were found to be informal. Thus, the influence of physical proximity on the interactions and linkages of actors in this local innovation system is to some extent over-estimated. There is insufficient synergy to create an innovative surplus from co-location of firms and research centres in this context. The study also suggests that promoting social and technological proximity between research centres and local firms, by introducing institutional or organisational arrangements that would facilitate these two dimensions of proximity, encourages greater extent of formal interaction between them as well as facilitates benefits from spatial relation of these local actors. Despite the absence of formal interaction with local firms, research centres collaborate with firms located outside the science park. The study introduces a typology to understand how research centres work with firms and shows that most of the collaborative projects involved industrial application and utilisation of technological knowledge accumulated within the research centres, which applied to the firms' products or development processes. Many of these projects resulted from collective projects or partnering experience between the research centre and firm, and were likely to follow with subsequent collaborations. In addition, the study reveals that technological factors, i.e. technological relatedness between the knowledge base of firms and research centres and firm's technological capacity, influence the way in which research centres work with firms in collaborative projects. Organisational and institutional settings of research centres, as well as cultural factors are identified as barriers of research collaboration in this study.The thesis concludes by indicating that physical proximity alone cannot trigger interaction of actors, especially formal interaction such as research collaboration, bounded by spatial relation. Interaction between public research organisations and firms can take place without closeness in distance. Other dimensions of their relationship are important factors influencing their interaction. The research collaboration between research centres and firms is a complex process and requires supportive organisational and institutional arrangements and effective policy intervention.
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SUGINO, Tomohide. "Human Development and Collaboration with Universities in Japan International Research Center for Agricultural Sciences (JIRCAS)." 名古屋大学農学国際教育協力研究センター, 2004. http://hdl.handle.net/2237/8938.
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Popplow, Laura. "Nur Mut zum Prozess! Oder: Wie kann zeitgemäße, mediale Ausstellungsgestaltung gelingen?" Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-111345.
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Der Besuch des im Bau befindlichen Staatlichen Museums für Archäologie Chemnitz bot den Teilnehmerinnen und Teilnehmern der Dresden Summer School 2012 die Möglichkeit, die Planung eines von Grund auf neuen Museums mit einer sehr modernen Ausstellungsarchitektur und Medieninszenierung durch die Mitarbeiter und den leitenden Ausstellungsgestalter kennenzulernen. (...)
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Ostendorf-Rupp, Sonja. "Kulturelle Bildung und Social Media." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-111333.
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Facebook, Twitter, YouTube – die Namen dieser Plattformen sozialer Medien sind in aller Munde, doch was steckt hinter diesen Medienformen und wie lassen sie sich sinnvoll in die Arbeit von Kultureinrichtungen integrieren? Welche Potentiale der Besucheransprache bieten sie? Das waren die Leitfragen der vierten und letzten Sektion der Dresden Summer School. Eingebettet in Besichtigungen des Militärhistorischen Museums der Bundeswehr (MHM) und des Deutschen Hygiene-Museums Dresden (DHMD), erhielten die Teilnehmer und Teilnehmerinnen eine Einführung zu diesem Thema, die durch Best-Practice-Beispiele von Museen und Ausstellungsplanern ergänzt wurden. (...)
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Fernández-Díaz, Álvaro, Christel Baier, Clara Benac-Earle, and Lars-Åke Fredlund. "Static Partial Order Reduction for Probabilistic Concurrent Systems." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-121261.
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Sound criteria for partial order reduction for probabilistic concurrent systems have been presented in the literature. Their realization relies on a depth-first search-based approach for generating the reduced model. The drawback of this dynamic approach is that it can hardly be combined with other techniques to tackle the state explosion problem, e.g., symbolic probabilistic model checking with multi-terminal variants of binary decision diagrams. Following the approach presented by Kurshan et al. for non-probabilistic systems, we study partial order reduction techniques for probabilistic concurrent systems that can be realized by a static analysis. The idea is to inject the reduction criteria into the control flow graphs of the processes of the system to be analyzed. We provide the theoretical foundations of static partial order reduction for probabilistic concurrent systems and present algorithms to realize them. Finally, we report on some experimental results.
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Fraunholz, Uwe, Sebastian Beese, and Ralf Pulla. "Ein Funken Wahrheit." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-139092.
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Jorswieck, Eduard A., Anne Wolf, and Sabrina Engelmann. "Secret key generation from reciprocal spatially correlated MIMO channels." Technische Universität Dresden, 2013. https://tud.qucosa.de/id/qucosa%3A28101.
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Secret key generation from reciprocal multi-antenna channels is an interesting alternative to cryptographic key management in wireless systems without infrastructure access. In this work, we study the secret key rate for the basic source model with a MIMO channel. First, we derive an expression for the secret key rate under spatial correlation modelled by the Kronecker model and with spatial precoding at both communication nodes. Next, we analyze the result for uncorrelated antennas to understand the optimal precoding for this special case, which is equal power allocation. Then, the impact of correlation is characterized using Majorization theory. Surprisingly for small SNR, spatial correlation increases the secret key rate. For high SNR, the maximum secret key rate is achieved for uncorrelated antennas. The results indicate that a solid system design for reciprocal MIMO key generation is required to establish the secret key rate gains.
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Lei, Xin. "Analyzing “Design + Medical” Collaboration Using Participatory Action Research (PAR): A Case Study of the Oxygen Saturation Data Display Project at Cincinnati Children’s Hospital Medical Center." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1427983695.
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Amaradasa, R. M. W. "Role of public policy in linking university and research centres with industry in Sri Lanka." Faculty of Commerce, 2004. http://ro.uow.edu.au/theses/1746.
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The promotional mechanisms employed in University-Research-Industry (URI) relationships have been considered a strategic factor in the development objectives of the industrialized countries. Such promotional mechanisms are based on recognized conceptual frameworks, which have been carefully examined by researchers. However, little work has been done in this field with respect to problems of less industrialized countries especially in small developing countries. The objective of this study was therefore to compare the URI characteristics and promotional mechanisms of developed countries with those in operation in small developing countries like Sri Lanka.The methodology employed for this study included exploratory survey, follow-up interviews, interviews with decision-makers and case studies while analytical tools in the grounded theory approach were used to deal with qualitative data.The URI relationships which are used as instruments to generate economic benefits, show wide discrepancies in performance among different countries. The promotional mechanisms, widely prevalent in industrialized countries, emphasized the importance of framework conditions. The characteristic features of the URI relationships in developed countries are better described in the international literature in terms of models, concepts and systems such as National System of Innovation. An analysis of literature shows that less industrialized countries need to have a better understanding of issues related to the operation of those relationships that are less rigorously influenced by theories and concepts developed in industrialized countries.The study revealed that the relationships in Sri Lanka are based on the lower end of the spectrum, characterized by short-term orientation that include education and training, and service-based relationships. Lack of structural mechanisms, financial constraints, regulatory rigidity, inadequacy of laboratory facilities and absence of inter-organizational communication seems to be the major features that curtail relationships. It was observed that process related constraints and weaknesses are widespread in all three types of organizations, in addition to the weaknesses related to the framework. Accordingly, three sets of issues based on internal and external factors for a particular type of organization were developed which could be widely used as check list of issues for any developing country. This checklist was tested with new forms of organizations which have evolved to overcome such weaknesses, by adopting the responsive-adaptive approach. The new forms of organizations show features such as heterogeneity, organizational diversity and trans-disciplinarity as well as internal transformation, influence of one type of organization upon another, creation of new organizations and networks. These features are more prevalent in organizations in developed countries. The findings lead to conclusion that the URI relationships in developing countries show in a broad context similarities to those of developed countries but at the same time differ in nature. The concepts and models used in developed countries to explain the URI relationships can also be used to explain those in developing countries. The importance in understanding micro level conditions and taking remedial measures to overcome negative impact is imperative. Finally, the public policy interventions that are necessary to promote URI relationships, while eliminating weaknesses in the framework and micro-environment are proposed in this study.
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Gerbracht, Sabrina, Eduard A. Jorswieck, Gan Zheng, and Björn Ottersten. "Non-regenerative Two-Hop Wiretap Channels using Interference Neutralization." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-113245.
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In this paper, we analyze the achievable secrecy rates in the two-hop wiretap channel with four nodes, where the transmitter and the receiver have multiple antennas while the relay and the eavesdropper have only a single antenna each. The relay is operating in amplify-and-forward mode and all the channels between the nodes are known perfectly by the transmitter. We discuss different transmission and protection schemes like artificial noise (AN). Furthermore, we introduce interference neutralization (IN) as a new protection scheme. We compare the different schemes regarding the high-SNR slope and the high-SNR power offset and illustrate the performance by simulation results. It is shown analytically as well as by numerical simulations that the high SNR performance of the proposed IN scheme is better than the one of AN.
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Krone, Stefan, and Gerhard Fettweis. "Capacity of Communications Channels with 1-Bit Quantization and Oversampling at the Receiver." Technische Universität Dresden, 2012. https://tud.qucosa.de/id/qucosa%3A26361.
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Communications receivers that rely on 1-bit analogto-digital conversion are advantageous in terms of hardware complexity and power dissipation. Performance limitations due to the 1-bit quantization can be tackled with oversampling. This paper considers the oversampling gain from an information-theoretic perspective by analyzing the channel capacity with 1-bit quantization and oversampling at the receiver for the particular case of AWGN channels. This includes a numerical computation of the capacity and optimal transmit symbol constellations, as well as the derivation of closed-form expressions for large oversampling ratios and for high signal-to-noise ratios of the channel.
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Fernández-Díaz, Álvaro, Christel Baier, Clara Benac-Earle, and Lars-Åke Fredlund. "Static Partial Order Reduction for Probabilistic Concurrent Systems." Technische Universität Dresden, 2012. https://tud.qucosa.de/id/qucosa%3A26083.
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Sound criteria for partial order reduction for probabilistic concurrent systems have been presented in the literature. Their realization relies on a depth-first search-based approach for generating the reduced model. The drawback of this dynamic approach is that it can hardly be combined with other techniques to tackle the state explosion problem, e.g., symbolic probabilistic model checking with multi-terminal variants of binary decision diagrams. Following the approach presented by Kurshan et al. for non-probabilistic systems, we study partial order reduction techniques for probabilistic concurrent systems that can be realized by a static analysis. The idea is to inject the reduction criteria into the control flow graphs of the processes of the system to be analyzed. We provide the theoretical foundations of static partial order reduction for probabilistic concurrent systems and present algorithms to realize them. Finally, we report on some experimental results.
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Greenwood, Joanne. "Educational professionals' experience of English educational policy : developing and promoting inclusive practice through collaborative action research." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/educational-professionals-experience-of-english-educational-policy-developingand-promoting-inclusive-practice-through-collaborative-action-research(71b447f1-6102-4817-9b61-0b4cf764cfd1).html.
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The focus of this thesis was to explore educational professionals' everyday experience of English educational policies; narrowing its focus to policy which promotes an inclusion agenda. The findings are presented in three sections with the first two papers prepared in accordance with the author guidelines of the journals proposed for submission. The first paper offers a review of literature which represents teacher relationship (see Braun, Maguire and Ball, 2010; Fullan, 2006; Luttenberg, Imants and van Veen, 2013; Luttenberg, van Veen and Imants, 2013; Wexler, 2002) with English educational policies. Teacher perspectives illustrate how the implementation and practice of policy heavily guides practice, both in terms of pedagogy and content, and detail the difficulties teachers have in establishing professional identity whilst trying to accommodate policy into practice. It is suggested that in order for teachers to adopt new educational policies they need to be able to take some ownership of both the policies themselves and of their own professional development; but most importantly, that they need the space to engage in dialogue around their practice to do this. The first paper provided a frame for the second by offering a description of the current climate teachers find themselves in and by discussing what might be needed to bring about the professional development necessary to embed policy into practice. The second paper then presents a description of a collaborative action research project within an English high school; a group of educational psychology, teaching, support and pastoral professionals worked collaboratively to develop person-centred practice through their engagement in an inquiry group. The inquiry group engaged in dialogue around practice; exploring their own personal and professional values as well as the values embedded within person-centred practice. This paper offers an account of the inquiry group's journey, highlighting key themes as identified by the group: ownership of, and confidence in, the learning process; developing reflective practice; and the challenge of engaging others in the learning process. The findings suggest that an action research approach can facilitate the learning and development necessary to embody collaborative person-centred practice. The third paper then offers a critical appraisal of the role that educational psychology can have in disseminating findings and promoting teacher development; in particular through the facilitation of collaborative action research within the school context.