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Song, Hyun-Cheol. "Piezoelectric-based Multi-Scale Multi-Environment Energy Harvesting." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/87400.
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Energy harvesting is a technology for generating electrical power from ambient or wasted energy. It has been investigated extensively as a means of powering small electronic devices. The recent proliferation of devices with ultra-low power consumption - devices such as RF transmitters, sensors, and integrated chipsets - has created new opportunities for energy harvesters. There is a variety of ambient energies such as vibration, thermal, solar, stray current, etc. Depending on energy sources, different kinds of energy conversion mechanism should be employed. For energy harvesters to become practical, their energy conversion efficiency must improve. This efficiency depends upon advances in two areas: the system or structural design of the energy harvester, and the properties of the materials employed in energy conversion. This dissertation explores developments in both areas. In the first area, the role of nano-, micro-, and bulk structure of the energy conversion materials were investigated. In the second area, piezoelectric energy harvesters and a magneto-thermoelectric generator are treated from the perspective of system design.
In the area of materials development, PbTiO3 (PTO) nanostructures consisting of nanofibers and three-dimensional (3-D) nanostructure arrays were hydrothermally synthesized. The growth mechanism of the PTO nanofibers and 3-D nanostructures were investigated experimentally and theoretically. The PTO nanostructures were composed of oriented PTO crystals with high tetragonality; these arrays could be promising candidates for nanogenerators.
Different designs for energy harvesters were explored as a means of improving energy conversion efficiency. Piezoelectric energy harvesters were designed and constructed for applications with a low frequency vibrational energy and for applications with a broadband energy spectrum. A spiral MEMS piezoelectric energy harvester design was fabricated using a silicon MEMS process and demonstrated to extract high power density at ultra-low resonance frequencies and low acceleration conditions. For a broadband energy harvester, a magnetically-coupled array of oscillators was designed and built that broadened the harvester's effective resonance frequency with considerably improved output power.
A new design concept for thermal energy harvesting that employs a magneto-thermoelectric generator (MTG) design was proposed. The MTG exploits a thermally-induced second order phase transition in a soft magnetic material near the Curie temperature. The MTG harvested electric power from oscillations of the soft magnet between hot and cold sources. For the MTG design, suitable soft magnetic materials were selected and developed using La0.85Sr0.15MnO3-Ni0.6Cu0.2Zn0.2Fe2O4 magnetic composites. The MTG was fabricated from a PVDF cantilever and a gadolinium (Gd) soft magnetic material. The feasibility of the design for harvesting energy from the waste heat was demonstrated by attaching an MTG array to a computer CPU.PHD
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Urovi, Visara. "MAGE - Multi-Agent Game Environment." Thesis, Royal Holloway, University of London, 2011. http://repository.royalholloway.ac.uk/items/c922a353-3969-3966-625a-79064ab2dcb8/9/.
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We study the use of games as a metaphor for building social interaction in norm-governed multi-agent systems. As part of our research we propose MAGE (Multi-Agent Game Environment) as a logic-based framework that represents complex agent interactions as games. MAGE seeks to (a) reuse existing computational techniques for defining event-based normative system and (b) complement these techniques with a coordination component to support complex interactions. A game in MAGE is defined by a state, a set of normative rules describing the valid moves at different states and a set of effect rules describing how the state evolves as a result of a move taking place. Given a specification of the normative rules, in the implementation of a game, we use game containers as components that mediate the moves of players by checking their compliance with the rules of the game and by maintaining the state of the game. The reuse part of MAGE relates physical actions that happen in an agent environment to valid moves of a game representing the social environment of an application. MAGE allows to model complex interactions from simpler atomic sub-games. In this context, we investigate how coordination patterns can be used to dynamically play more than one game in parallel, change the status of games or choose amongst games. For this purpose, we examine how to define compound games from atomic sub-games. Compound games are build by describing the conditions and the patterns that activate a sub- game and the coordination mechanisms of MAGE ensure that sub-games are activated according to how interactions are specified to evolve at run-time. To illustrate the MAGE approach, we discuss how to use the framework to specify the social interaction in two different scenarios: (i) Open-Packet- World - a simple simulation where agents compete to collect and deliver packets in a grid and (ii) an earth-observation application - where agents represent services, both for clients and providers, and negotiate the provision of these services by combining argumentation and communication protocols. We also use the Open-Packet-World scenario to evaluate the effectiveness of the framework. We show that we can effectively support at run-time a large- scale multi-agent systems regulated by norms. We conclude the dissertation by summarising our contributions and identifying areas for future work.
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Ortega-Garcia, Javier, Julian Fierrez, Fernando Alonso-Fernandez, J. Galbally, M. R. Freire, J. Gonzalez-Rodriguez, C. Garcia-Mateo, et al. "The Multi-Scenario Multi-Environment BioSecure Multimodal Database (BMDB)." Escuela Politecnica Superior, Univ. Autonoma de Madrid, Spain, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-21221.
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Wu, Kuo-Cheng. "A multi-functional collaborative design environment." Thesis, University of Salford, 2012. http://usir.salford.ac.uk/26969/.
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Typical construction projects involving a large number of stakeholders working together require a tremendous amount of collaboration amongst them. In order to reduce the cost and length of the project life cycle undertaken by the design team and to avoid any catastrophic problems at later stages in the life cycle, technologies such as BIM and CAD tools have been adopted to support more efficient design assessment. This research is to explore a human-centric collaborative environment for the construction sector that can allow multi-functional team members to come together to visualise, explore, assess and design optimised building solutions. It resulted in creating a collaboration platform that integrates multi-functional interfaces allowing teams to explore the design from their own perspectives. Within this multi-user environment the concept of private and public spaces were explored in order to enhance design exploration, both individually and as a team. The environment was tested for the utility, likability and usefulness of the collaborative design system taking the design of a bathroom for a disabled client as a case study. The final results suggest that in overall it could potentially enhance the multi-functional collaborative design.
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Azad, Hedayat. "Multi-service, multi-rate and multi-environment hybrid spread spectrum CDMA for mobile communications." Thesis, King's College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271427.
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Kazemi, Zanjani Masoumeh. "Multi-Period, Multi-Product Production Planning in an Uncertain Manufacturing Environment." Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26229/26229.pdf.
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Zanjani, Masoumeh Kazemi. "Multi-period, multi-product production planning in an uncertain manufacturing environment." Doctoral thesis, Université Laval, 2009. http://hdl.handle.net/20.500.11794/20850.
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Les travaux de cette thèse portent sur la planification de la production multi-produits, multi-périodes avec des incertitudes de la qualité de la matière première et de la demande. Un modèle de programmation stochastique à deux étapes avec recours est tout d'abord proposé pour la prise en compte de la non-homogénéité de la matière première, et par conséquent, de l'aspect aléatoire des rendements de processus. Ces derniers sont modélisés sous forme de scénarios décrits par une distribution de probabilité stationnaire. La méthodologie adoptée est basée sur la méthode d'approximation par moyenne d'échantillonnage. L'approche est appliquée pour planifier la production dans une unité de sciage de bois et le modèle stochastique est validé par simulation de Monte Carlo. Les résultats numériques obtenus dans le cas d'une scierie de capacité moyenne montrent la viabilité de notre modèle stochastique, en comparaison au modèle équivalent déterministe. Ensuite, pour répondre aux préoccupations du preneur de décision en matière de robustesse, nous proposons deux modèles d'optimisation robuste utilisant chacun une mesure de variabilité du niveau de service différente. Un cadre de décision est développé pour choisir parmi les deux modèles d'optimisation robuste, en tenant compte du niveau du risque jugé acceptable quand à la variabilité du niveau de service. La supériorité de l'approche d'optimisation robuste, par rapport à la programmation stochastique, est confirmée dans le cas d'une usine de sciage de bois. Finalement, nous proposons un modèle de programmation stochastique qui tient compte à la fois du caractère aléatoire de la demande et du rendement. L'incertitude de la demande est modélisée par un processus stochastique dynamique qui est représenté par un arbre de scénarios. Des scénarios de rendement sont ensuite intégrés dans chaque noeud de l'arbre de scénarios de la demande, constituant ainsi un arbre hybride de scénarios. Nous proposons un modèle de programmation stochastique multi-étapes qui utilise un recours complet pour les scénarios de la demande et un recours simple pour les scénarios du rendement. Ce modèle est également appliqué au cas industriel d'une scierie et les résultats numériques obtenus montrent la supériorité du modèle stochastique multi- étapes, en comparaison avec le modèle équivalent déterministe et le modèle stochastique à deux étapes.
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Zhang, Xiaodong. "Multi-Cloud simulation environment for WebRTC streams." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-219919.
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Real-time streaming is becoming popular nowadays on the internet. WebRTC is a promising web technology that enables media stream transmission between two browsers without other third-party plugins. However, traditional WebRTC applications can only establish peer-to-peer (P2P) communications, which cannot be directly used in one-to-more streaming scenarios such as a multi-party video conference. This thesis project presents a development of a multi-cloud simulation framework to implement software multicast of WebRTC streams to enable oneto-more real-time streaming. The framework can generate a cloud network topology with a simple script, and provides flexible ways to model the network links with parameters such as bandwidth, packet loss, and link latency. By using selective forwarding units (SFUs), a stream publisher only needs to send a single copy of the data to the cloud, the data packets are duplicated and forwarded to multiple subscribers. In addition, three resource allocation algorithms are included in the framework to determine the data center for a task. To evaluate the performance, this framework enables people to monitor the throughputs and running streams on the data centers during the experiments. We develop benchmark applications as substitutes for real WebRTC traffic. These applications can generate UDP stream packets with the same dimension of WebRTC packets and provide the customization of stream parameters. In this report, we present a comparison of the stream performances under different allocation algorithms. Finally, as an outcome of this project, we design an integrated functional test to simulate a real-world scenario. The result shows that the framework is able to work well on complex real cases and simulate most of the multi-cloud networks.
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Foltman, Mary Ann. "AMUSED : a multi-user software environment diagnostic /." Online version of thesis, 1989. http://hdl.handle.net/1850/10495.
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Gogel, Beverley J. "Spatial analysis of multi-environment variety trials /." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phg613.pdf.
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Kaddouri, F. "Multi-view editing environment for CSG modelling." Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305791.
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Özgü, Tokgöz 1973. "A simulation environment for multi-user telerobotics." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50441.
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Bathe, Shivraj Gajanan. "Secure Communication in a Multi-OS-Environment." Master's thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-196760.
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Current trend in automotive industry is moving towards adopting the multicore microcontrollers in Electronic Control Units (ECUs). Multicore microcontrollers give an opportunity to run a number of separated and dedicated operating systems on a single ECU. When two heterogeneous operating systems run in parallel on a multicore environment, the inter OS communication between these operating systems become the key factor in the overall performance. The inter OS communication based on shared memory is studied in this thesis work. In a setup where two operating systems namely EB Autocore OS which is based on AUTomotive Open System Architecture standard and Android are considered. Android being the gateway to the internet and due to its open nature and the increased connectivity features of a connected car, many attack surfaces are introduced to the system. As safety and security go hand in hand, the security aspects of the communication channel are taken into account. A portable prototype for multi OS communication based on shared memory communication with security considerations is developed as a plugin for EB tresos Studio.
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Truedsson, Max, and Erik Westergren. "Adversarial learning in a multi-agent environment." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280323.
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Reinforcement learning is one of the main paradigms of machine learning. In this paradigm learners (agents) are not explicitly told what to do, instead they must on their own explore their environment and determine which actions to take, in order to maximize some numerical signal. Reinforcement learning has several challenges, one of which is the training time. The agents can re- quire millions of training sessions to become proficient at their task, which is troublesome since for most systems it is costly to produce the data. This thesis investigates whether it is beneficial for agents learning to play tag, regarding their proficiency as well as their training speed, to train against other learning agents over non-learning agents. This was done by training the agents in tag with different opponents and performing benchmarks throughout the training. The benchmarks measured how many times the predators managed to tag the prey (runner) in several games. The results from the benchmarks showed that it was more beneficial for both proficiency as well as training speed to train the agents against other learning agents. The non-learning training at best did not affect the performance of the agents and at worst hampered both the learning speed as well as the agents’ proficiency.Förstärkningsinlärning (reinforcement learning) är ett paradigm inom maskininlärning. I detta paradigm får inte agenter (de som ska lära sig) instruktioner på vad de ska göra, istället måste de självständigt utforska och pröva sig fram för att lära sig ett beteende som maximerar någon numerisk signal. Förstärksningsinlärning har dock flera utmaningar och problem, en av dessa är tränings- tid. Det kan krävas miljontals träningspass för att agenterna ska bli duktiga på deras uppgift, något som är problematiskt då det är dyrt för många system att producera datan. Denna avhandling undersöker om det är fördelaktigt för agenter som lär sig leka kull, vad det gäller deras spelfärdighet och träningshastighet, om de tränas mot andra lärande agenter istället för icke-lärande agenter. För att undersöka detta så har agenter tränats att leka kull mot olika typer av motståndare och under träningen så har flera benchmarks utförts. Benchmarksen räknade hur många gånger jagarna fångat bytet under flera spelomgångar. Resultaten från benchmarksen visade att det är fördelaktigt både för spel- färdighet men också träningshastighet att agenter tränas mot andra lärande agenter. Träningen mot icke-lärande agenter påverkade som bäst inte resultatet och i värsta fall så försämrades både träningshastigheten samt spelfärdigheten.
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Larsson, Jonas. "Network Automation in a Multi-vendor Environment." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80810.
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Automation is something that effects every occupation, and everyone wants more of. Networking is not any different were the systematic tasks that can be prone to human errors and the long time-wasting configuration surely could be automated. But a problem in networking is that when there aren’t any standards to follow vendors do their own solutions that only works on their own devices. This is not a problem if you're only using one vendor in your network, but what if you don't then how do you automate your network? This is the question this report is trying to answer. First by trying to develop a new solution in Python to automate networking tasks and then see if there is any existing product that works in a multi-vendor network that can be tested. Then test the programs, see what functions exist and demonstrate how they work and see advantages and disadvantages with the solutions. The new program in Python is planned, the different functions that the program is going to have is explained, the development is done and then tested. Then a program called UNIMUS is installed and tested. The development resulted in a program that’s called Kraft Prime. The testing on Kraft Prime shows a program that offers automation on different tasks like configuration and upgrading. The results from testing UNMIUS also shows a program that offer automation functions like mass configuration and configuration backups. The results from the development and testing shows that it is possible to develop your own network automation program in Python that offers different kinds of automation in a multi-vendor environment. But also, that there are existing programs like UNIMUS that also offers automation. But both solutions come with their ups and downs that must be considered before implementing any of the solutions.
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Chen, Weiya. "Collaboration in Multi-user Immersive Virtual Environment." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS248/document.
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Les Environnements Virtuels Immersifs (EVI) peuvent être utilisés pour amener des utilisateurs, répartis géographiquement ou co-localisés, à partager un même monde virtuel pour collaborer. Si l’on compare aux situations distantes, les utilisateurs d’une immersion co-localisée collaborent aussi dans le monde virtuel, mais a contrario, partagent physiquement un même espace de travail. Cette co-localisation facilite le travail collaboratif en permettant des communications directes et des interactions sans médiation informatique entre les utilisateurs.Avec le développement de l'affichage multi-utilisateur et de la technologie de tracking, les dispositifs immersifs classiques basés sur la rétroprojection (ex. CAVE) peuvent offrir maintenant l'immersion pour plusieurs utilisateurs co-localisés en affichant différentes vues stéréoscopiques sans distorsion visuelle pour chacun d’eux. Dans ce contexte, la coexistence de l'information du monde virtuel et réel, en particulier lorsque les utilisateurs ne partagent pas un référentiel spatial commun, offre aux utilisateurs une nouvelle expérience perceptive et cognitive. Dans cette thèse nous nous sommes intéressés à la façon dont les utilisateurs se perçoivent et communiquent entre eux pour atteindre un contexte commun pour la collaboration, et aux moyens permettant d’élargir des scénarios collaboratifs déjà pris en charge dans ce type de dispositifs, basés sur des techniques de contrôle plus flexible des points de vue des utilisateurs. Cette thèse de doctorat traite donc principalement des problèmes perceptifs et de cohabitation que nous avons identifiés dans l’objectif d’assurer la sécurité et l’efficacité des collaborations co-localisées dans les environnements virtuels immersifs. Tout d'abord, nous avons mené une étude de cas pour examiner comment les conflits perceptifs modifieraient la communication entre les utilisateurs et leur performance. Deuxièmement, nous avons conçu et évalué des paradigmes de navigation appropriés pour permettre la navigation virtuelle individuelle tout en résolvant les problèmes de la cohabitation dans un espace de travail partagé physiquement limité. Enfin, sur la base des résultats de ces travaux, nous avons proposé un modèle dynamique générique qui intègre des contraintes de l'espace de travail physique et aussi ceux du monde virtuel pour gérer la collaboration co-localisée dans les systèmes immersifs multi-utilisateursImmersive virtual environment can be used to bring both geographically distributed and co-located users to the same virtual place for collaboration. Compared to remote situations, co-located users collaborate in the same virtual world on top of a shared physical workspace. This collocation allows direct user communication and interaction without computer mediation which facilitates collaborative work. With the development of multi-user display and tracking technology, classical projection-based immersive setups (e.g. CAVE) can now support group immersion for co-located users by offering individual stereoscopic views without visual distortion. In this context, the coexistence of information from the virtual and real world, especially when users do not share a common spatial reference frame, provides users with a new kind of perceptual and cognitive experience. We are interested in how users perceive and communicate with each other to achieve a shared context for collaboration, and how we can broaden supported collaborative scenarios with more flexible viewpoint control.This PhD thesis mainly addresses perceptual and cohabitation issues that we identified in the aim of supporting safe and efficient co-located collaboration in immersive virtual environment. First, we conducted a case study to examine how perceptual conflicts would alter user communication and task performance. Second, we concentrated on the design and evaluation of appropriate navigation paradigms to allow individual virtual navigation while solving cohabitation problems in a shared limited physical workspace. At last, based on the results of previous studies, we designed a generic dynamic navigation model which integrates constrains from the physical workspace and also the virtual world to enable co-located collaboration in multi-user immersive systems
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Barrus, Joseph D. "Intrusion detection in real-time in a multi-node, multi-host environment." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA341406.
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Thesis (M.S. in Software Engineering) Naval Postgraduate School, September 1997."September 1997." Thesis advisor(s): Neil C. Rowe, Ronald Broersma. Includes bibliography references (p. 77). Also available online.
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Wittering, Kate. "Multi-component crystallisation in the continuous flow environment." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687312.
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The research described in this thesis was carried out as part of the EPSRC National Centre in Continuous Manufacturing and Crystallisation (CMAC), whose vision is to accelerate the adoption of continuous manufacturing processes for the production of high-value chemical products. Results focus upon the crystallisation of multi-component molecular complexes (MMCs), in particular co-crystals, an important class of potential functional molecular materials. MMCs are commonly discovered through small scale batch solvent evaporation, a method that provides little control over the crystallisation process, often yields only small quantities of crystalline material which may not be phase pure and is not generally scalable. Methods have been developed to help translate traditional small scale batch co-crystallisation of MMCs to selective continuous co-crystallisation processes. The co-crystal system urea-barbituric acid (UBA) has three polymorphs, previously identified in the literature and was selected as a candidate for transfer to continuous crystallisation as its polymorphism offers a development challenge in being able to achieve selectivity of solid products through by various crystallisation processes. Chapter 4 describes small scale crystallisation studies of UBA using evaporation, cooling and mechano-crystallisation techniques, demonstrating that UBAI is the more prevalent polymorph. Solid state and solubility analysis of the isolated UBA polymorphs are detailed; these data provide information on the energetic relationship between the polymorphs highlighting the similarity in energy of UBAI and UBAIII, and the metastable nature of elusive UBAII. In addition the polymorphic nature of the barbituric acid starting material has been investigated with samples from different suppliers proving to consist of different polymorphs. As well as being important in designing subsequent crystallisation processes, results from these studies corroborate work previously reported in the literature Chapter 5 describes how these results have been used in development of continuous crystallisation experiments using Mixed-Suspension Mixed-Product Removal (MSMPR) with a cascade of three stirred tank reactors, while Chapter 6 investigates flow crystallisation of UBA using the Continuous Oscillatory Baffled Crystalliser (COBC) and the Kinetically Regulated Automated Input tubular flow Crystalliser (KRAIC). The KRAIC was designed and constructed as part of this research. The continuous crystallisation experiments presented in Chapters 5 and 6 demonstrate the selective continuous co-crystallisation of UBAI across all three continuous crystallisation platforms. In Chapter 7 a range of novel co-crystalline MMCs is presented, with structural determinations, using single crystal X-ray diffraction, coupled with characterisation of properties and crystallisation characteristics; these studies emphasise the physical property advantages of MMCs and in some cases their potential for future translation to continuous crystallisation.
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Arkaresvimun, Rintiya. "Inventory optimization in a retail multi-echelon environment." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45251.
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Thesis (M. Eng. in Logistics)--Massachusetts Institute of Technology, Engineering Systems Division, 2008.Includes bibliographical references (leaf 66).
The objective of the study is to find an optimal inventory distribution in a retail three-echelon environment, consisting of a supplier, a DC, and stores. An inventory model is built by replicating the echelons' periodic, order-up-to-level policies with all echelons' transactions integrated. Network carrying cost is set as an objective function, while the store target service level and the store's minimum order-up-to-levels are set as constraints. A heuristic approach, that combines the optimization and simulation methods, is used to find the optimal inventory distribution. The results show that the optimal network carrying cost can be achieved by having low inventory and low service level at the DC. In addition, the impact of the echelons' deviations from the optimal policies as well as the impact of the upstream echelon's service disruptions on the other echelons confirms the interrelation between the echelons in the network. The analyses also illustrate that high target service level can be accomplished by keeping high inventory at the stores and the DC.
by Rintiya Arkaresvimun.
M.Eng.in Logistics
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Halliday, Mark David. "Digital cinema--an environment for multi-threaded stories." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/29071.
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Mutiso, Herman M. "Multi-node mirrored NVRAM in a virtualized environment." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66449.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 33).
The demand for increased data availability and reliability of storage systems has contributed to the design and deployment of multi-node data storage clusters. This paper presents a simulator of one such multi-node, multi-machine cluster. The simulator is architected by extending the NetApp, Inc. 2-node cluster architecture to an N-node design. Data availability is provided by mirroring client requests to a subset of peers in the multi-node cluster. Using this simulator, this thesis explores the relationship between the number of peers that each node mirrors to and the overall mirroring latency. This thesis also explores the performance cost incurred when, in response to a mirroring request from a peer node, a node stores the mirrored data in nonvolatile storage before acknowledgment. Using a workload consisting of multiple write requests to different nodes in the simulator, this thesis finds that there exists a linear relationship between the number of mirroring peers in a cluster and the resulting mirroring latency. Experiments using this workload also reveal a 40% increase in mirroring latency when the mirroring requests are stored on peer nodes persistent storage as opposed to volatile memory.
by Herman M. Mutiso.
M.Eng.
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Mengistu, Dawit. "Multi-Agent Based Simulations in the Grid Environment." Licentiate thesis, Karlskrona : Blekinge Institute of Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00371.
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The computational Grid has become an important infrastructure as an execution environment for scientific applications that require large amount of computing resources. Applications which would otherwise be unmanageable or take a prohibitively longer execution time under previous computing paradigms can now be executed efficiently on the Grid within a reasonable time. Multi-agent based simulation (MABS) is a methodology used to study and understand the dynamics of real world phenomena in domains involving interaction and/or cooperative problem solving where the participants are characterized by entities having autonomous and social behaviour. For certain domains the size of the simulation is extremely large, intractable without employing adequate computing resources such as the Grid. Although the Grid has come with immense opportunities to resource demanding applications such as MABS, it has also brought with it a number of challenges related to performance. Performance problems may have their origins either on the side of the computing infrastructure or the application itself, or both. This thesis aims at improving the performance of MABS applications by overcoming problems inherent to the behaviour of MABS applications. It also studies the extent to which the MABS technologies have been exploited in the field of simulation and find ways to adapt existing technologies for the Grid. It investigates performance monitoring and prediction systems in the Grid environment and their implementation for MABS application with the purpose of identifying application related performance problems and their solutions. Our research shows that large-scale MABS applications have not been implemented despite the fact that many problem domains that cannot be studied properly with only partial simulation. We assume that this is due to the lack of appropriate tools such as MABS platforms for the Grid. Another important finding of this work is the improvement of application performance through the use of MABS specific middleware.
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O'Brien, Jennifer Rose. "Developing a Multi-vehicle Aerospace Simulation Environment (MASE)." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1453553.
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Cooper, Robert C. "Remote application support in a multi level environment /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FCooper.pdf.
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Almeida, Caio Sacramento de Britto. "A multi-view environment for markerless augmented reality." Instituto de Matemática. Departamento de ciência da Computação, 2014. http://repositorio.ufba.br/ri/handle/ri/19287.
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Realidade aumentada e uma tecnologia que permite que gr a cos computacionais 2D e 3D sejam alinhados ou registrados com cenas do mundo real em tempo real. Esta proje ção de imagens virtuais requer uma referência na imagem real capturada, o que geralmente e obtido atrav es da utiliza c~ao de um ou mais marcadores. Mas existem situa c~oes em que a utiliza c~ao de marcadores pode não ser adequada, como por exemplo em aplica cões m edicas. Neste trabalho, e apresentado um ambiente multi-câmera, composto por oculos de realidade aumentada e dois dispositivos Kinect, o qual n~ao utiliza marcadores duciais para executar aplica cões de realidade aumentada. Todos os equipamentos s~ao calibrados de acordo com um sistema de referência comum, e então os modelos virtuais são transformados de acordo, tamb em. Para isso, duas abordagens foram especi cadas e implementadas: a primeira, baseada em um Kinect e dados de uxo otico e acelerômetro dos oculos de realidade aumentada, e outra baseada somente em dois dispositivos Kinect. Os resultados relacionados a qualidade e a performance obtidas por estas duas abordagens s~ao apresentados e discutidos, bem como uma compara c~ao entre eles, al em de todas as questões relacionadas que foram encontradas e tratadas neste trabalho.
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Guerreiro, Pedro Miguel Rito. "Visual programming in a heterogeneous multi-core environment." Master's thesis, Universidade de Évora, 2009. http://hdl.handle.net/10174/18505.
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É do conhecimento geral de que, hoje em dia, a tecnologia evolui rapidamente. São criadas novas arquitecturas para resolver determinadas limitações ou problemas. Por vezes, essa evolução é pacífica e não requer necessidade de adaptação e, por outras, essa evolução pode Implicar mudanças. As linguagens de programação são, desde sempre, o principal elo de comunicação entre o programador e o computador. Novas linguagens continuam a aparecer e outras estão sempre em desenvolvimento para se adaptarem a novos conceitos e paradigmas. Isto requer um esforço extra para o programador, que tem de estar sempre atento a estas mudanças. A Programação Visual pode ser uma solução para este problema. Exprimir funções como módulos que recebem determinado Input e retomam determinado output poderá ajudar os programadores espalhados pelo mundo, através da possibilidade de lhes dar uma margem para se abstraírem de pormenores de baixo nível relacionados com uma arquitectura específica. Esta tese não só mostra como combinar as capacidades do CeII/B.E. (que tem uma arquitectura multiprocessador heterogénea) com o OpenDX (que tem um ambiente de programação visual), como também demonstra que tal pode ser feito sem grande perda de performance. ABSTRACT; lt is known that nowadays technology develops really fast. New architectures are created ln order to provide new solutions for different technology limitations and problems. Sometimes, this evolution is pacific and there is no need to adapt to new technologies, but things also may require a change every once ln a while. Programming languages have always been the communication bridge between the programmer and the computer. New ones keep coming and other ones keep improving ln order to adapt to new concepts and paradigms. This requires an extra-effort for the programmer, who always needs to be aware of these changes. Visual Programming may be a solution to this problem. Expressing functions as module boxes which receive determined Input and return determined output may help programmers across the world by giving them the possibility to abstract from specific low-level hardware issues. This thesis not only shows how the CeII/B.E. (which has a heterogeneous multi-core architecture) capabilities can be combined with OpenDX (which has a visual programming environment), but also demonstrates that lt can be done without losing much performance.
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Argollo, de Oliveira Dias Júnior Eduardo. "Performance prediction and tuning in a multi-cluster environment." Doctoral thesis, Universitat Autònoma de Barcelona, 2006. http://hdl.handle.net/10803/5761.
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Los clusters de computadores son una alternativa actual usada para el cómputo de aplicaciones científicas. Sin embargo las aplicaciones crecen en complejidad y necesitan más recursos. Unir estos clusters distribuidos usando Internet en un multi-cluster puede permitir lograrlo. Un problema que se introduce con esta colaboración es un incremento en la heterogeneidad tanto de cómputo como de comunicación, aumentando la complejidad de dicho sistema lo que dificulta su uso.
El objetivo de esta tesis es lograr la reducción del tiempo de ejecución de aplicaciones, originalmente desarrolladas para un cluster, usando eficientemente un multi-cluster.
Proponemos una arquitectura del sistema para lograr una máquina virtual multi-cluster transparente a la aplicación que además la dota de escalabilidad y robustez tolerando los problemas de la comunicación por Internet. Esta arquitectura propone un master-worker jerárquico en el que se introducen elementos claves como los gestores de comunicación que dotan al sistema de robustez, seguridad y transparencia en las comunicaciones entre clusters a través de Internet.
Desarrollamos un modelo de prestaciones para poder hacer una estimación teórica del tiempo de ejecución y de la eficiencia de una aplicación ejecutándose en un multi-cluster. La precisión de las estimaciones es superior al 90%.
Proponemos una metodología que da un procedimiento que define los pasos para realizar la predicción del tiempo de ejecución, para garantizar un umbral de eficiencia seleccionando los recursos adecuados y para guiar a la sintonización de la aplicación encontrando los cuellos de botella de la ejecución.
Clusters of computers represent an alternative for speeding up scientific applications. Nevertheless applications grow in complexity and need more resources. The joint of distributed clusters, using Internet, in a multi-cluster can allow the resources obtainment.
A problem on reaching an effective collaboration from multiple clusters is the increase on the computation and communication heterogeneity. This factor increases the complexity of such a system bringing difficulties in its use.
The target of this thesis is to attain the reduction of the execution time of applications, originally written for a single cluster, efficiently using a multi-cluster. In order to reach this goal we propose a system architecture, an analytical model and a performance and tuning methodology.
The proposed system architecture aims to obtain a multi-cluster virtual machine, transparent to the application and that provides scalability and robustness, tolerating possible faults in the Internet communication between clusters. This architecture is organized around a hierarchical master-worker with communication managers. Communication managers are a key element responsible for the robustness, security and transparency in the communication between clusters using Internet.
The analytical performance model was developed to estimate the execution time and efficiency of an application executing in a multi-cluster. The precision on the estimations are over 90%.
The proposed performance prediction and application tuning methodology is a procedure that defines the steps to predict the execution time and efficiency, to guarantee an efficiency threshold and to guide on the application tuning, evaluating the execution bottlenecks.
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Riva, Christian. "A programming environment for real-time multi-threaded systems." Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/10199.
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In recent years, the rapid progress in the functionality, performance, and cost of VLSI technology has made multiprocessor computer platforms feasible and cost-effective. The key benefit of these platforms is their ability to offer true concurrency at the physical layer, through the replication of processor, memory and I/O facilities, and at the logical layer, through the support for multi-tasking and multi-threading. For many applications, such as those found in the real-time problem domain, the concurrent nature of these platforms bring numerous advantages. To this date however, because of the lack of real-time concurrent programming tools, delivering the potential benefits of multiprocessing directly to these applications has proven elusive. This thesis proposes the Multi-Activity Programming Environment (MAPE) which allows developers to exploit the concurrent capabilities of multiprocessor platforms while remaining consistent with the requirements of the real-time problem domain. MAPE provides a programming model and a set of supporting tools which facilitate the decomposition of an application into cooperating entities and allow for the specification of deadline-based time constraints. The MAPE components also support the allocation of the platform's resources and the modification of the application's functionality based on run-time urgency considerations.
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Beaudoin, Daniel. "Distributed wood procurement planning within a multi-firm environment." Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25120/25120.pdf.
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Kossman, Don. "A multi-microprocessor-based control environment for industrial robots /." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65335.
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De, Luca Andrea. "SOI smart multi-sensor platform for harsh environment applications." Thesis, University of Cambridge, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709510.
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Northrop, Robert B. (Robert Brian) 1963. "Platform-based product development in a multi-platform environment." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/88828.
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Xu, Zhi-Hui 1976. "Generic exception analysis in a dynamic multi-agent environment." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86568.
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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.Includes bibliographical references (leaves 45-46).
by Zhi-Hui (Winifred) Xu.
S.B.and M.Eng.
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Bassi, Lorenzo. "Orchestration of a MEC-based multi-protocol IoT environment." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24114/.
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Nowadays we are witnessing to a continuous increasing of the number of IoT devices that must be configured and supported by modern networks. Considering an industrial environment, there is a huge number of these devices that need to coexist at the same time. Each one of them is using its own communication/transport protocol, and a huge effort needs to be done during the setup of the system. In addition, there are also different kind of architectures that can be used. That’s why the network setup is not so easy in this kind of heterogeneous environment.
The answer to all these problems can be found in the emerging cloud and edge computing architectures, allowing new opportunities and challenges. They are capable of enable on-demand deployment of all the IoT services.
In this thesis is proposed a Multi-access Edge Computing (MEC) approach to face all the possible multi-protocol scenarios. All the services are transformed into MEC-based services, even if they are running over multiple technological domains.
As result, was proved that this kind of solution is effective and can simplify the deployment of IoT services by using some APIs defined by the MEC standard.
As above mentioned, one of the most important tasks of these new generation’s networks is to be self-configurable in very low amount of time and this will be the scope of my research.
The aim of this thesis is to try to reduce as much as possible the time that a certain network requires to be self-configured in an automatic way considering an Industrial IoT as a Service (IIoTaaS) scenario.
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Fainter, Robert Gaffney. "AdaTAD - a debugger for the Ada multi-task environment." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/54289.
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In a society that is increasingly dependent upon computing machinery, the issues associated with the correct functioning of that machinery are of crucial interest. The consequences of erroneous behavior of computers are dire with the worst case scenario being, conceivably, global thermonuclear war. Therefore, development of procedures and tools which can be used to increase the confidence of the correctness of the software that controls the world's computers is of vital importance.
The Department of Defense (DoD) is in the process of adopting a standard computer language for the development of software. This language is called Ada¹. One of the major features of Ada is that it supports concurrent programming via its "task" compilation unit. There are not, however, any automated tools to aid in locating errors in the tasks.
The design for such a tool is presented. The tool is named AdaTAD and is a debugger for programs written in Ada. The features of AdaTAD are specific to the problems of concurrent programming.
The requirements of AdaTAD are derived from the literature. AdaTAD is, however, a unique tool designed using Ada as a program description language. When AdaTAD is implemented in Ada it becomes portable among all environments which support the Ada language. This offers the advantage that a single debugger is portable to many different machine architectures. Therefore, separate debuggers are not necessary for each implementation of Ada.
Moreover, since AdaTAD is designed to allow debugging of tasks, AdaTAD will also support debugging in a distributed environment. That means that, if the tasks of a user's program are running on different computers in a distributed environment, the user is still able to use AdaTAD to debug the tasks as a single program. This feature is unique among automated debuggers.
After the design is presented, several examples are offered to explain the operation of AdaTAD and to show that AdaTAD is useful in revealing the location of errors specific to concurrent programming.Ph. D.
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Yin, Chunjiang. "Convergence techniques in a multi-standard mobile communication environment." Göttingen Cuvillier, 2008. http://d-nb.info/990658252/04.
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Shiel, Michael P. "Multi-level information fusion for environment aware robotic navigation." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/61955/1/Michael_Shiel_Thesis.pdf.
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This thesis develops the hardware and software framework for an integrated navigation system. Dynamic data fusion algorithms are used to develop a system with a high level of resistance to the typical problems that affect standard navigation systems.
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Harrison, Jackie L. "British television news in the 1990s : newsworthiness in a multi-organisational and multi-programme environment." Thesis, University of Sheffield, 1995. http://etheses.whiterose.ac.uk/3003/.
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This study is concerned with the constituent features of television news in Britain in the 1990s. It examines both the content of television news and production strategies employed by television journalists in the context of the changing structural and cultural relations of British television during the 1980s and 1990s. An underlying theme of this thesis is the important role that television news has to play in relation to citizenship rights and as an important institution of the public sphere in Britain. A process of fragmentation of the television news genre has in recent years, resulted in the evolution of a variety of different news programmes which exhibit different concepts of newsworthiness and public interest journalism. Such fragmentation is challenging long established notions of quality and public interest progranmiing and replacing them with a more populist approach emphasing entertainment. In addition the ability of televison news to play an important role in enabling the public to play an active part in a democracy is being further restricted and undermined in the mid- 1990s through the increasing commercialization of broadcasting institutions. To date analyses of news content and news production have tended to ignore the complexity of the news genre itself and have assumed that television journalism can be analysed as a unitary practice, neglecting the competitive diversity and dynamic technological change occurring in British broadcasting. However it is a theme of this thesis that the critical analysis and interpretation of television news remains incomplete without an in-depth study of the multiplicity of news programmes and news orgamsations which exist in Britain in the 1990s. This thesis shows, using content analysis and observational analysis, that television news in the 1990s has reached a critical juncture. Key vectors of change, politico-economic (including the new wave of commercialization of television news in the 1990s), technological and transnational influences have strongly affected the broadcasting environment in Britain over the last decade and increased the pressure on news providers. News values are becoming more tied to particular contractual specifications made upon news programmes. Newsworthiness itself is constructed within journalistic professional culture, by the journalist's zone and mode of operation, and is adapted to the designated style of an organisation or programme. The variety and diversity of "mid-ranking stories" and the differences in treatment of "big news stories" by different news programmes - processes which are revealed in the empirical studies in this thesis - illustrate clearly how newsworthiness can be adapted and changed to fit particular programme epistemologies.
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Camara, (Silvervarg) Karin. "A visual query language served by a multi-sensor environment." Licentiate thesis, Linköping University, Linköping University, GIS - Geographical Information Science Group, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10089.
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A problem in modern command and control situations is that much data is available from different sensors. Several sensor data sources also require that the user has knowledge about the specific sensor types to be able to interpret the data.
To alleviate the working situation for a commander, we have designed and constructed a system that will take input from several different sensors and subsequently present the relevant combined information to the user. The users specify what kind of information is of interest at the moment by means of a query language. The main issues when designing this query language have been that (a) the users should not have to have any knowledge about sensors or sensor data analysis, and (b) that the query language should be powerful and flexible, yet easy to use. The solution has been to (a) use sensor data independence and (b) have a visual query language.
A visual query language was developed with a two-step interface. First, the users pose a “rough”, simple query that is evaluated by the underlying knowledge system. The system returns the relevant information that can be found in the sensor data. Then, the users have the possibility to refine the result by setting conditions for this. These conditions are formulated by specifying attributes of objects or relations between objects.
The problem of uncertainty in spatial data; (i.e. location, area) has been considered. The question of how to represent potential uncertainties is dealt with. An investigation has been carried out to find which relations are practically useful when dealing with uncertain spatial data.
The query language has been evaluated by means of a scenario. The scenario was inspired by real events and was developed in cooperation with a military officer to assure that it was fairly realistic. The scenario was simulated using several tools where the query language was one of the more central ones. It proved that the query language can be of use in realistic situations.
Report code: LiU-Tek-Lic-2007:42.
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Robinson, David Iain. "Multi-scale modelling of effluent dispersion in the marine environment." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/34690.
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This research aimed to investigate whether the unique numerical methods available within CFD model software Fluidity could progress the state-of-the-art in various aspects of modelling effluent dispersion within the marine environment. Fluidity contains a large library of models and numerical methods that enable modelling of flow processes at a wide range of scales. It has been proven to perform well when used for massively-parallel simulations (i.e. it scales well), and it has the uncommon facility of unstructured mesh adaptivity, which has the prospect of significantly increasing the efficiency of CFD simulations when guided skillfully. This research also forms part of a longer-term project to create a coupled (or even single) model of effluent dispersion that represents influencing factors from a wide range of scales (from tidal currents down to turbulent eddies) entirely using CFD techniques. As such, one aspect of the research was to validate the numerical methods available within Fluidity for use in modelling effluent dispersion. To facilitate this validation, some of the model studies investigate aspects of effluent dispersion modelling from a hypothetical outfall site off the North-East coast of the United Kingdom. Studies were performed in a series of stages in which key aspects of effluent dispersion modelling were addressed. CFD models were created of near-field jet dispersion, tidal motion, and far-field plume dispersion. Idealised test cases were also performed to investigate the performance of advection-diffusion solver methods. At each stage the aim was to investigate the benefit of novel numerical modelling techniques and compare their accuracy and efficiency to existing methods. A set of near-field buoyant jet dispersion CFD models were created, one representing conditions associated with power, and combined power and desalination plants, and one representing conditions typically associated with desalination discharge. These CFD models utilised a mesh adaptivity algorithm to optimise mesh resolution during the course of the simulation. Model predictions were compared with published laboratory data and the predictions from validated integral models. An assessment was made of when CFD offers a benefit over other modelling options, and when it might be sufficient to use cheaper tools. There was also a discussion of the effectiveness of mesh adaptivity in increasing model efficiency, together with advice for how and when it is best to use mesh adaptivity when modelling buoyant jet dispersion. Model results showed that with modest parallel computing resources and expertise, high-resolution simulations of jet dynamics can be achieved with reasonable accuracy using CFD modelling. A model was created of tidal flow within the European continental shelf and results were compared to a large database of tide gauge measurements. This model took advantage of recently published methods for ocean model meshing and coastline resolution reduction. The purpose of this study was to confirm that these methods offered a benefit to model accuracy and efficient, and also that Fluidity could be used to accurately generate the tidal forcing boundary conditions for a far-field model of effluent dispersion at a hypothetical outfall site. The predictions of M2 tide amplitude in the vicinity of the outfall site had an average error of 10.1% compared with tide gauge measurements. The predictions of S2 tide amplitude in the vicinity of the outfall site were even closer to tide gauge measurements, with an average error of 3.7%. The speed of the model solve showed a vast improvement over a previous comparison model study, with 37 days of tidal motion being simulated in 15.2 hours (58.4 seconds of simulation for each second of solving), compared to the comparison simulation with a similar level of accuracy, which simulated 2 seconds of tidal motion for every second of solver time. A series of simplified test cases were run to assess a commonly-used advection-diffusion solution method from the library of those available within Fluidity. This work was intended to give general confidence that the numerical methods available within Fluidity are suitable for modelling coastal processes and so give confidence in later multi-scale results. The test cases chosen were relevant to coastal dispersion, including those testing tracer advection, diffusion, point sources and stratification. The method compared well with results published using world-leading free surface modelling software, Open TELEMAC. A model was created of the dispersion of neutrally-buoyant dissolved pollutant from a hypothetical outfall. The assumed effluent is typical of that released from a manufacturing plant. The aim of this modelling was to validate the use of Fluidity for modelling effluent dispersion within the coastal zone, and also investigate the benefit of using 2-d horizontal mesh adaptivity to optimise model mesh resolution during the course of the simulation. It was shown that the use of mesh adaptivity improved model efficiency, significantly lowering the effect of numerical diffusion. Finally, a short outline was given of a prospective strategy for producing a coupled-model of effluent dispersion, using as a basis the techniques developed within this thesis. The proposed coupled model of effluent dispersion would include a near-field jet model two-way (i.e. 'fully-coupled') to a far-field plume model. Tidal forcing would be provided by a one-way coupled tidal model. Fluidity is capable of modelling all of these processes and so third party coupling software would be unnecessary.
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Eraslan, Mejdi. "VESIR-6: Virtual environment supporting multi-user interaction over IPv6." Thesis, University of Ottawa (Canada), 2000. http://hdl.handle.net/10393/8779.
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Virtual environments (VEs) are interactive computer simulations that immerse users in an alternate reality. Multi-user VE applications simulate the experience of real-time interaction among multiple users in a shared three-dimensional (3D) virtual world. The Internet has a growing importance as a communication medium for presenting multi-user VEs and interaction among distributed VEs. In this thesis, we identify the requirements for highly interactive multi-user VEs and limitations of collaboration over the Internet. We focus on the design, implementation, and evaluation of network communication infrastructures for multi-user virtual environments, also exploiting the multicast and quality of service (QoS) support introduced with IPv6, the next generation Internet protocol. We propose an architecture, VESIR-6, that combines the 3-D navigational and interactive capabilities of virtual worlds with the communication capability of the next generation IPv6 protocol to bring people together in one virtual world, regardless of their physical locations, in a platform-independent manner. The goal of the project is to get all the parties together in one virtual world, allowing them to see each other, to interact with each other, and to affect that common world in a secure and high-quality network infrastructure over the Internet.
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Ho, Ghee Wee. "The concept of captaincy in a military multi-aircrew environment." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0002/NQ43426.pdf.
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Eraslan, Mejdi. "VESIR-6, virtual environment supporting multi-user interaction over IPv6." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0021/MQ57115.pdf.
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Camara, Karin. "A visual query language served by a multi-sensor environment /." Linköping : Linköpings universitet, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10089.
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Lobb, William Boyd. "Patients' decision making in a multi-tier co-payment environment /." Full text available from ProQuest UM Digital Dissertations, 2007. http://0-proquest.umi.com.umiss.lib.olemiss.edu/pqdweb?index=0&did=1414127491&SrchMode=1&sid=1&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1219951761&clientId=22256.
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Taylor, Grant S. "Comparing Types of Adaptive Automation within a Multi-Tasking Environment." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5527.
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Throughout the many years of research examining the various effects of automation on operator performance, stress, workload, etc., the focus has traditionally been on the level of automation, and the invocation methods used to alter it. The goal of the current study is to instead examine the utilization of various types of automation with the goal of better meeting the operator's cognitive needs, thus improving their performance, workload, and stress. The task, control of a simulated unmanned robotic system, is designed to specifically stress the operator's visual perception capabilities to a greater degree. Two types of automation are implemented to support the operator's performance of the task: an auditory beep aid intended to support visual perception resources, and a driving aid automating control of the vehicle's navigation, offloading physical action execution resources. Therefore, a comparison can be made between types of automation intended to specifically support the mental dimension that is under the greatest demand (the auditory beep) against those that do not (the driving automation). An additional evaluation is made to determine the benefit of adaptively adjusting the level of each type of automation based on the current level of task demand, as well as the influence of individual differences in personality. Results indicate that the use of the auditory beep aid does improve performance, but also increases Temporal Demand and Effort. Use of driving automation appears to disengage the operator from the task, eliciting a vigilance response. Adaptively altering the level of automation to meet task demands has a mixed effect on performance and workload (reducing both) when the auditory beep automation is used. However, adaptive driving automation is clearly detrimental, causing an increase in workload while decreasing performance. Higher levels of Neuroticism are related to poorer threat detection performance, but personality differences show no indication of moderating the effects of either of the experimental manipulations. The results of this study show that the type of automation implemented within an environment has a considerable impact on the operator, in terms of performance as well as cognitive/emotional state.ID: 031001412; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Adviser: James L. Szalma.; Title from PDF title page (viewed June 13, 2013).; Thesis (Ph.D.)--University of Central Florida, 2012.; Includes bibliographical references (p. 93-104).
Ph.D.
Doctorate
Psychology
Sciences
Psychology; Human Factors Psychology
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Petersen, Ariel Teresa Leigh. "Modification and dispersal of bones in a multi-scavenger environment." Thesis, Boston University, 2013. https://hdl.handle.net/2144/12185.
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Thesis (M.S.)--Boston UniversityIndividuals left to decompose in outdoor environments may be subjected to all manner of carnivore scavenging before they are recovered. This study documents scavenging patterns to determine the effect of multiple species on human-sized pig (Sus scrofa) remains in an outdoor setting. It is hypothesized that that identification of the species involved in scavenging and postmortem damage to bone will correlate with patterns in the way skeletal elements are dispersed from the original point of deposition. Furthermore, the interactions of multiple species of scavengers modifying the same remains will impact the dispersal of skeletal elements differently than in studies documenting single scavenger taxa. The research was conducted on private land in the Yosemite Valley, CA, USA. Six pigs of comparable mass to adult humans were left exposed for five weeks beginning May 22, 2012, and observed daily for the first two weeks. After skeletonization, the bones were mapped, collected, and examined for carnivore modification. Two additional pigs were placed separately and left undisturbed for approximately six weeks, after which a thorough search of the area was undertaken to locate and map skeletal elements. Eighteen defleshed cow (Bos taurus) femora were also secured in the same outdoor environment to document scavenger gnaw marks and behavior. Six additional femora were given to domestic dogs (Canis familiaris) to document gnaw marks and behavior. Results of this study suggest that regular human interaction has an impact on carnivore behavior. During observational period of the study, carnivore activity was nonexistent. Once daily observations had ceased, within two days coyotes (Canis latrans) and wild pigs (Sus scrofa) began scavenging the remains. Coyotes and turkey vultures (Cathartes aura) scavenged the undisturbed pigs as early as two days after deposition, and complete disarticulation had occurred by the end of the six-week study. The cow femora were scavenged by turkey vultures and ravens (Corvus corax) daily regardless of human presence but were only scavenged by coyotes after daily observations had ceased. Analysis of dispersal patterns revealed that a majority of skeletal elements were found either adjacent to the original deposition site or along nearby game trails. This suggests following game trails is an effective technique for law enforcement attempting to locate remains. However, entire carcasses can be removed with minimal skeletal elements or soft tissue left behind, stressing the importance of detailed searches for small bones to establish the original site of deposition.
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Saha, Sumanta. "OBSAI Interoperability in Multi-Vendor WiMAX Base Station Architecture Environment." Thesis, KTH, Kommunikationssystem, CoS, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91500.
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Wireless networks have become a necessity with the increased mobility in human life. From cellular telephony to the Internet, all types of communication are now provided over wireless networks. However, to offer wireless network coverage over an area requires a potentially expensive infrastructure deployment. Such deployment requires base stations which until now have been completely proprietary to the equipment vendors. Moreover, proprietary equipment is almost always costly and offer less flexibility than standardized modular solutions. This situation results in a high cost for network upgradation and hinders network development. A remedy is available via modularization, hence the Open Base Station Architecture Initiative (OBSAI) is trying to modularize and standardize one of the most expensive elements of the wireless infrastructure, the base station. OBSAI standards aim to modularize the base station architecture and enable true interoperability among the various modules. However, the goal has not yet been achieved due to some features of the standard. This thesis project has studied the standards and pointed out some areas that must be concentrated upon when performing interoperability tests. It also proposes several standards amendments to foster greater interoperability among the modules of a base station. This study focuses on the RP3 interface of the OBSAI specification with the goal of making truly inter-operable baseband and RF modules, thus commoditizing the modules. The result is expected to be lower cost, greater interoperability, faster time-to-market, and more cooperative research.Langattomat laajakaistaverkot ovat tulleet välttämättömäksi osaksi liikkuvien ihmisten elämää. Lähes kaikki kommunikaatiotarpeet äänipuheluista internettiin pystytään toteuttamaan langattomien verkkojen avulla. Kuitenkin jotta langattomilla verkoilla pystytään tarjoamaan täysi peittävyys yli maan, se vaatii varsin kalliita investointeja verkkoinfrastruktuuriin. Langattomien verkkojen investoinnit koostuvat suurelta osin tukiasemista, jotka tähän asti ovat olleet kullakin verkkotoimittajalla täysin omanlaisensa toteutus. Kun jokainen verkkotoimittaja toteuttaa kaikki tukiaseman osat erilailla, se tarkoittaa että kutakin tukiaseman osia valmistetaan suhteellisesti pienempiä määriä ja sitä myötä niistä tulee mahdollisesti kalliimpia verrattuna standardoituhin modulaarisiin tukiasemaratkaisuihin. Nykyinen tilanne siis osaltaan johtaa siihen että verkkojen rakentaminen ja päivittäminen on kallista. Eräs ratkaisu tähän ongelmaan on tarjolla modulaarisessa tukiasemaratkaisussa ja siksi OBSAI, Open Base Station Initiative, pyrkii modulaarisoimaan ja standardoimaan yhden kalliimmista verkkoinfrastruktuurin osista, tukiaseman. OBSAI standardi pyrkii modularisoimaan tukiasema-arkkitehtuurin ja mahdollistamaan todellisen yhteensopivuuden tukiaseman eri osien välillä. Tätä todellista yhteensopivuutta ei ole vielä täysin pystytty toteuttamaan, johtuen tietyistä standardin epätarkkuuksista. Tässä lopputyössä on analysoitu OBSAI standardia ja identifioitu alueet, joihin pitää keskittyä, kun modulien välistä yhteensopivuutta testataan. Työn lopputulemana myös ehdotetaan useita parannuksia ja muutoksia standardiin, jotta todellinen yhteensopivuus modulien välillä saavutetaan. Painopiste lopputyössä on OBSAI standardin RP3 rajapinta, joka määrittelee kantataajuusosan (BB) ja radiotaajuusosan (RF) välisen rajapinnan. Kun OBSAI standardia saadaan parannettua työssä ehdotetuin toimenpitein, lopputuloksena on oletettavasti alhaisempi tukiaseman kokonaiskustannus, mahdollisuus käyttää yhteensopivia moduleita eri valmistajilta, nopeampi tuotteiden markkinoille vienti sekä parantunut tutkimusyhteistyö eri yritysten välillä.
Trådlösa nät har blivit en nödvändighet i vår allt mer mobila livsstil. Från mobiltelefoni till Internet, trådlösa nät erbjuder många typer av kommunikation. Men att erbjuda trådlös täckning i ett område kan kräva installation av en mängd dyrbar telekomutrustning. En sådan utbyggnad kräver basstationer som fram till nu har varit patentskyddade av respektive leverantör. Och patentskyddad utrustning är oftast både dyrare och mindre flexibel jämfört med standardiserade modulära lösningar. Resultatet är höga kostnader för att uppgradera näten och att utvecklingen försvåras. Ett botemedel är användningen av standardiserade moduler. Därfär försöker Open Base Station Architecture Initiative (OBSAI) att standardisera moduler i ett av de dyraste nätelementen i trådlösa nät, basstationen. OBSAI har som mål att dela upp basstationen i definierade moduler och möjliggöra fullständig interaktion mellan olika moduler. Men på grund av vissa egenskaper hos standarden har detta inte lyckats. Denna studie har undersökt standarden och pekar på områden som man måste fokusera på när man utför tester mellan moduler. Dessutom föreslås flera tillägg till standarden för att möjliggöra bättre interaktion mellan basstationens moduler. Studien fokuserar på RP3- gränssnittet med målet att möjliggöra standardiserad interaktion mellan basbands- och radio-moduler, så att dessa moduler kan kommerisialiseras. Det förväntade resultatet är lägre kostnader, bättre interaktion mellan moduler, snabbare marknadsintroduktion och mer samarbete inom forskning och utveckling.
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Chang, Chin-Lung, and 張欽隆. "Open Environment For Multi-threaded Programming." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/09738011275974314217.
Full textAbstract:
碩士淡江大學
資訊管理學系
89
An integrated development environment (IDE) can reduce the effort of software development in the repeated edit-compile-link-test cycle. An open integrated development environment (OIDE) enables a programmer to access variables and invoke functions directly, and provides a more effective way to test and develop software. However, the user interface of an OIDE may be frozen when some functions are invoked. In order to resolve the freezing problem and to support the development of multi-threaded program, an open environment for multi-threaded programming (MOIDE) is proposed in this paper. An MOIDE manages two kinds of components: static components and dynamic components. We analyze the working of dynamic components and propose the management model of dynamic components. According to the model, a prototype of MOIDE has been implemented.
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HUNG, CHOU-YU, and 周昱宏. "Multi-function Based Environment Detection Vehicle." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/mn9s67.
Full textAbstract:
碩士國立雲林科技大學
電機工程系
107
The purpose of this thesis uses Makeblock materials to design and create a multi-function based environment detection vehicle. The controller of the vehicle is Makeblock Orion. The vehicle is equipped with the fire sensor and the gas sensor. The drive device uses DC motors to implement the motion trajectories. The video device uses the DroidCamApp with the phone lens to transmit image signals to the computer. The multi-function based environment detection vehicle is completed by the Makeblock. The vehicle uses the front-end sensor to detect the gas density. In the disaster area. The sensors measure the high value of the gas density or detect the flame. It will transmit the data and the image to the computer immediately in order to control the vehicle and understand the indoor situation clearly.