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1
Amaro, da Cruz Mauro. "An enhanced multi-protocol middleware solution for Internet of things." Thesis, Mulhouse, 2021. https://www.learning-center.uha.fr/.
Full textAbstract:
Dans l'Internet des objets (IoT), les données sont gérées et stockées par un logiciel appelé middleware (situé sur un serveur). L'évolution du concept IoT a conduit à la construction de nombreux intergiciels IoT, des logiciels qui jouent un rôle clé car ils prennent en charge la communication entre les appareils, les utilisateurs et les applications. Plusieurs aspects peuvent impacter les performances d'un middleware. Basée sur une revue approfondie de la littérature associée et sur la proposition d'un modèle de référence pour le middleware IoT, cette thèse propose un nouveau middleware IoT, appelé In.IoT, une solution middleware évolutive, sécurisée et innovante basée sur une revue approfondie du état de l'art et suivant l'architecture middleware de référence proposée dans le cadre de ce travail de recherche. In.IoT répond aux préoccupations middleware des solutions les plus populaires (sécurité, convivialité et performances) qui ont été évaluées, démontrées et validées tout au long de cette étude, et il est prêt et disponible à l'utilisation. Les recommandations et les exigences architecturales d'In.IoT sont détaillées et peuvent être reproduites par des solutions nouvelles et disponibles. Il prend en charge les protocoles de couche application les plus populaires (MQTT, CoAP et HTTP). Ses performances sont évaluées en comparaison avec les solutions les plus prometteuses disponibles dans la littérature et les résultats obtenus par la solution proposée sont extrêmement prometteurs. De plus, cette thèse étudie l'impact du langage de programmation sous-jacent sur les performances globales de la solution grâce à une étude d'évaluation des performances incluant Java, Python et Javascript, identifiant que globalement, Java s'avère être le choix le plus robuste pour le middleware IoT. Les appareils IoT communiquent avec le middleware via un protocole de couche application qui peut différer de ceux pris en charge par le middleware, en particulier lorsque l'on considère que les ménages auront divers appareils de différentes marques. La thèse offre une alternative pour de tels cas, en proposant une passerelle de couche application, appelée MiddleBridge. MiddleBridge traduit les messages CoAP, MQTT, DDS et Websockets en HTTP (HTTP est pris en charge par la plupart des intergiciels IoT). Avec MiddleBridge, les appareils peuvent envoyer un message plus petit à un intermédiaire (MiddleBridge), qui le restructure et le transmet à un middleware, réduisant ainsi le temps qu'un appareil passe à transmettre. Les solutions proposées ont été évaluées par rapport à d'autres solutions similaires disponibles dans la littérature, en tenant compte des métriques liées à la taille des paquets, aux temps de réponse, aux requêtes par seconde et au pourcentage d'erreur, démontrant leurs meilleurs résultats et leur énorme potentiel. En outre, l'étude a utilisé XGBoost (une technique d'apprentissage automatique) pour détecter l'occurrence d'attaques de réplication lorsqu'un attaquant obtient les informations d'identification de l'appareil, en l'utilisant pour générer de fausses données et perturber l'environnement IoT. Les résultats obtenus sont extrêmement prometteurs. Ainsi, il est conclu que l'approche proposée contribue à l'état de l'art des solutions middleware IoTIn Internet of Things (IoT), data is handled and stored by software known as middleware (located on a server). The evolution of the IoT concept led to the construction of many IoT middleware, software that plays a key role since it supports the communication among devices, users, and applications. Several aspects can impact the performance of a middleware. Based in a deep review of the related literature and in the proposal of a Reference Model for IoT middleware, this thesis proposes a new IoT middleware, called In.IoT, a scalable, secure, and innovative middleware solution based on a deep review of the state of the art and following the reference middleware architecture that was proposed along with this research work. In.IoT addresses the middleware concerns of the most popular solutions (security, usability, and performance) that were evaluated, demonstrated, and validated along this study, and it is ready and available for use. In.IoT architectural recommendations and requirements are detailed and can be replicated by new and available solutions. It supports the most popular application-layer protocols (MQTT, CoAP, and HTTP). Its performance is evaluated in comparison with the most promising solutions available in the literature and the results obtained by the proposed solution are extremely promising. Furthermore, this thesis studies the impact of the underlying programming language in the solution's overall performance through a performance evaluation study that included Java, Python, and Javascript, identifying that globally, Java demonstrates to be the most robust choice for IoT middleware. IoT devices communicate with the middleware through an application layer protocol that may differ from those supported by the middleware, especially when it is considered that households will have various devices from different brands. The thesis offers an alternative for such cases, proposing an application layer gateway, called MiddleBridge. MiddleBridge translates CoAP, MQTT, DDS, and Websockets messages into HTTP (HTTP is supported by most IoT middleware). With MiddleBridge, devices can send a smaller message to an intermediary (MiddleBridge), which restructures it and forwards it to a middleware, reducing the time that a device spends transmitting. The proposed solutions were evaluated in comparison with other similar solutions available in the literature, considering the metrics related to packet size, response times, requests per second, and error percentage, demonstrating their better results and tremendous potential. Furthermore, the study used XGBoost (a machine learning technique) to detect the occurrence of replication attacks where an attacker obtains device credentials, using it to generate false data and disturb the IoT environment. The obtained results are extremely promising. Thus, it is concluded that the proposed approach contributes towards the state of the art of IoT middleware solutions
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Gunji, Akira. "Inferring Design Environment (IDE) : "(re) shaping a design pattern as a learning process"." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33035.
Full textAbstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2005.Includes bibliographical references (leaves 14-16).
This proposal examines the Design process through developing a dialog or game-like graphic software environment. Inferring Design Environment (IDE) is a concept sketch that assimilates a dialog or turn-taking game onto a two dimensional digital canvas, which in turn helps designers learn about their learning processes. This turn-taking process eventually gives rise to meaningful expression through the use of a rule the Designer has made previously. Henceforth, learning is not something that has a goal and purpose such as teaching does, but is rather the emergence and discovery of an interaction of finite elements and the "self"' in an Environment.
by Akira Gunji.
S.M.
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Kim, Taekyu. "Ontology/Data Engineering Based Distributed Simulation Over Service Oriented Architecture For Network Behavior Analysis." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/193678.
Full textAbstract:
As network uses increase rapidly and high quality-of-service (QoS) is required, efficient network managing methods become important. Many previous studies and commercial tools of network management systems such as tcpdump, Ethereal, and other applications have weaknesses: limited size of files, command line execution, and large memory and huge computational power requirement. Researchers struggle to find fast and effective analyzing methods to save maintenance budgets and recover from systematic problems caused by the rapid increment of network traffic or intrusions. The main objective of this study is to propose an approach to deal with a large amount of network behaviors being quickly and efficiently analyzed. We study an ontology/data engineering methodology based network analysis system. We design a behavior, which represents network traffic activity and network packet information such as IP addresses, protocols, and packet length, based on the System Entity Structure (SES) methodology. A significant characteristic of SES, a hierarchical tree structure, enables systems to access network packet information quickly and efficiently. Also, presenting an automated system design is the secondary purpose of this study. Our approach shows adaptive awareness of pragmatic frames (contexts) and makes a network traffic analysis system with high throughput and a fast response time that is ready to respond to user applications. We build models and run simulations to evaluate specific purposes, i.e., analyzing network protocols use, evaluating network throughput, and examining intrusion detection algorithms, based on Discrete Event System Specification (DEVS) formalism. To study speed up, we apply a web-based distributed simulation methodology. DEVS/Service Oriented Architecture (DEVS/SOA) facilitates deploying workloads into multi-servers and consequently increasing overall system performance. In addition to the scalability limitations, both tcpdump and Ethereal have a security issue. As well as basic network traffic information, captured files by these tools contain secure information: user identification numbers and passwords. Therefore, captured files should not allow to be leaked out. However, network analyses need to be performed outside target networks in some cases. The distributed simulation--allocating distributing models inside networks and assigning analyzing models outside networks--also allows analysis of network behaviors out of networks while keeping important information secured.
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Kourtesis, Marios. "Creating a Secure Server Architecture and Policy for Linux-based Systems." Thesis, Linnéuniversitetet, Institutionen för datavetenskap (DV), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-41007.
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Creating and maintaining servers for hosting services in a secure and reliable way is an important but complex and time-consuming task. Misconfiguration and lack of server maintenance can potentially make the system vulnerable. Hackers can exploit these vulnerabilities in order to penetrate into the system internals and cause damage. Having a standard architecture/configuration supporting the needed services saves time and resources while it reduces security risks. A server architecture protected by a security policy can secure the integrity and quality of the overall services. This research demonstrates building a secure server architecture protected by a security policy. To achieve this a security policy and a checklist was designed and combined with a host based IDPS, a NMS and a WAF.
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Pollet, Damien. "Une architecture pour les transformations de modèles et la restructuration de modèles uml." Phd thesis, Université Rennes 1, 2005. http://tel.archives-ouvertes.fr/tel-00538536.
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Avec l'ingénierie des modèles on cherche à résoudre le problème de l'évolution des grands systèmes informatiques. En effet, ces systèmes doivent s'adapter à l'évolution des besoins et des technologies, et cette évolution est de plus en plus rapide par rapport à celle du domaine métier. On souhaite donc réutiliser l'expertise de ce domaine indépendamment des technologies sur lesquelles on s'appuie, grâce à des techniques de manipulation de modèles. La contribution présentée dans ce manuscrit est une architecture de manipulation de modèles indépendante d'un quelconque métamodèle. Cette architecture favorise la réutilisation des techniques reconnues de génie logiciel orienté objet pour le développement de transformations de modèles. La sémantique de l'interface d'accès aux modèles est spécifiée par une implémentation de référence en langage fonctionnel. Notre approche est fondée sur une interface de niveau mof (Meta-Object Facility) pour la manipulation de modèles. Le langage associé permet de manipuler des éléments de modèle directement, car la structure du métamodèle étend dynamiquement l'ensemble des types accessibles au programme de transformation. D'un point de vue méthodologique, on montre que les transformations de modèles synthétisent l'expertise d'implantation d'un domaine métier vers une technologie donnée ; il est donc utile de modéliser les transformations les plus complexes pour les développer en appliquant récursivement les techniques de génie logiciel et d'ingénierie des modèles. La mise en pratique illustre ce point et montre le fonctionnement de l'architecture de manipulation de modèles avec des transformations pour l'introduction de design patterns et la restructuration de modèles uml (Unified Modeling Language).
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Akhlaq, Monis. "Improved performance high speed network intrusion detection systems (NIDS) : a high speed NIDS architectures to address limitations of packet loss and low detection rate by adoption of dynamic cluster architecture and traffic anomaly filtration (IADF)." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5377.
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Intrusion Detection Systems (IDS) are considered as a vital component in network security architecture. The system allows the administrator to detect unauthorized use of, or attack upon a computer, network or telecommunication infrastructure. There is no second thought on the necessity of these systems however; their performance remains a critical question. This research has focussed on designing a high performance Network Intrusion Detection Systems (NIDS) model. The work begins with the evaluation of Snort, an open source NIDS considered as a de-facto IDS standard. The motive behind the evaluation strategy is to analyze the performance of Snort and ascertain the causes of limited performance. Design and implementation of high performance techniques are considered as the final objective of this research. Snort has been evaluated on highly sophisticated test bench by employing evasive and avoidance strategies to simulate real-life normal and attack-like traffic. The test-methodology is based on the concept of stressing the system and degrading its performance in terms of its packet handling capacity. This has been achieved by normal traffic generation; fussing; traffic saturation; parallel dissimilar attacks; manipulation of background traffic, e.g. fragmentation, packet sequence disturbance and illegal packet insertion. The evaluation phase has lead us to two high performance designs, first distributed hardware architecture using cluster-based adoption and second cascaded phenomena of anomaly-based filtration and signature-based detection. The first high performance mechanism is based on Dynamic Cluster adoption using refined policy routing and Comparator Logic. The design is a two tier mechanism where front end of the cluster is the load-balancer which distributes traffic on pre-defined policy routing ensuring maximum utilization of cluster resources. The traffic load sharing mechanism reduces the packet drop by exchanging state information between load-balancer and cluster nodes and implementing switchovers between nodes in case the traffic exceeds pre-defined threshold limit. Finally, the recovery evaluation concept using Comparator Logic also enhance the overall efficiency by recovering lost data in switchovers, the retrieved data is than analyzed by the recovery NIDS to identify any leftover threats. Intelligent Anomaly Detection Filtration (IADF) using cascaded architecture of anomaly-based filtration and signature-based detection process is the second high performance design. The IADF design is used to preserve resources of NIDS by eliminating large portion of the traffic on well defined logics. In addition, the filtration concept augment the detection process by eliminating the part of malicious traffic which otherwise can go undetected by most of signature-based mechanisms. We have evaluated the mechanism to detect Denial of Service (DoS) and Probe attempts based by analyzing its performance on Defence Advanced Research Projects Agency (DARPA) dataset. The concept has also been supported by time-based normalized sampling mechanisms to incorporate normal traffic variations to reduce false alarms. Finally, we have observed that the IADF has augmented the overall detection process by reducing false alarms, increasing detection rate and incurring lesser data loss.
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Martin, Kyle A. "Harmony oriented architecture." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4795.
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This thesis presents Harmony Oriented Architecture: a novel architectural paradigm that applies the principles of Harmony Oriented Programming to the architecture of scalable and evolvable distributed systems. It is motivated by research on Ultra Large Scale systems that has revealed inherent limitations in human ability to design large-scale software systems that can only be overcome through radical alternatives to traditional object-oriented software engineering practice that simplifies the construction of highly scalable and evolvable system. HOP eschews encapsulation and information hiding, the core principles of object-oriented design, in favor of exposure and information sharing through a spatial abstraction. This helps to avoid the brittle interface dependencies that impede the evolution of object-oriented software. HOA extends these concepts to distributed systems resulting in an architecture in which application components are represented by objects in a spatial database and executed in strict isolation using an embedded application server. Application components store their state entirely in the database and interact solely by diffusing data into a space for proximate components to observe. This architecture provides a high degree of decoupling, isolation, and state exposure allowing highly scalable and evolvable applications to be built. A proof-of-concept prototype of a non-distributed HOA middleware platform supporting JavaScript application components is implemented and evaluated. Results show remarkably good performance considering that little effort was made to optimize the implementation.ID: 031001554; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Title from PDF title page (viewed August 26, 2013).; Thesis (M.S.)--University of Central Florida, 2011.; Includes bibliographical references (p. 79-84).
M.S.
Masters
Electrical Engineering and Computer Science
Engineering and Computer Science
Computer Science
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Stead, Sarah. "PLACE, SPACE, AND FORM CAPTURED THROUGH PHOTOGRAPHIC MEDITATION." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4193.
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Inspired by Buddhist philosophy, the photographic series Architectural Zen attempts to beautify banal and pragmatic architecture through limiting and preexisting artificial light conditions. The selective illumination of artificial light eliminates the non-essential details and enhances the pure forms and saturated color presented by the camera lens. This encourages the photographer and the viewer to enter a state of meditation. The resulting process is similar to a Zen approach to image making. The ancient Zen artist s compositions are strengthened by a meditation on form and subsequent elimination of the non-essential elements of the subject. Through embracing this Zen mentality and mindfulness,aspects of Eastern aesthetic and balance also appear through the work. The warm glow of artificial lights, long recessed shadows, and surreal colors contribute to the feeling of rest, contemplation, isolation, and solitude. Although the work in Architectural Zen is not directly about Buddhist doctrines, the process of creating the art parallels the ideas and practices of Zen Buddhism and meditation, finding the Buddha nature of typically unappealing architectural forms during a different time of day.M.F.A.
Department of Art
Arts and Humanities
Studio Art and the Computer MFA
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Joanne, Pascal. "L'espace sensible du monastère cistercien aux origines : essai de caractérisation des ambiances architecturales." Nantes, 2003. http://portaildocumentaire.citechaillot.fr/search.aspx?SC=theses&QUERY=cour+ouverte#/Detail/%28query:%28Id:%270_OFFSET_0%27,Index:1,NBResults:1,PageRange:3,SearchQuery:%28CloudTerms:!%28%29,ForceSearch:!t,Page:0,PageRange:3,QueryString:Joanne,ResultSize:10,ScenarioCode:theses,ScenarioDisplayMode:display-standard,SearchLabel:%27%27,SearchTerms:Joanne,SortField:!n,SortOrder:0,TemplateParams:%28Scenario:%27%27,Scope:%27%27,Size:!n,Source:%27%27,Support:%27%27%29%29%29%29.
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PALCZYNSKI, MATTHEW JOSEPH. "ROTHKO AND ARCHITECTURE." Diss., Temple University Libraries, 2011. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/213124.
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Art HistoryPh.D.
The overall goal of this dissertation is to identify and examine the neglected aspects of the literature on Mark Rothko's 1958-1959 project to make murals for the Four Seasons restaurant (see Figs. 1-12) in the then-newly opened Seagram Building in Manhattan. These include Rothko's attempts to merge the mediums of painting and architecture in order to create an antagonistic environment in the restaurant; how his visits to Italy before and during the project reinforced this goal; how a good deal of the figurative paintings from Rothko's earliest career anticipated his blend of aggression and architecturally-related themes; the connection between Rothko and Mies van der Rohe, the architect of the building, in regard to the theme of transcendence; and how his experiments with architectural subjects and motifs aligned Rothko with some of the most influential vanguard artists in New York in the late 1950s and early 1960s. Discussions of these topics will suggest that his career-long references to architecture functioned, for him, as something intended to produce discomfort in the viewer. I will show that his acceptance of a lucrative commission to make paintings for a lavish restaurant that might seem at first to suggest pandering to an élite audience had the paradoxical effect of condemning that audience. I intend also to demonstrate that Rothko understood that the project was not merely about making paintings. Instead, for him, it dealt more with the challenge of uniting architecture and painting.
Temple University--Theses
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Pagna, Disso Jules Ferdinand. "A novel intrusion detection system (IDS) architecture : attack detection based on snort for multistage attack scenarios in a multi-cores environment." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/5248.
Full textAbstract:
Recent research has indicated that although security systems are developing, illegal intrusion to computers is on the rise. The research conducted here illustrates that improving intrusion detection and prevention methods is fundamental for improving the overall security of systems. This research includes the design of a novel Intrusion Detection System (IDS) which identifies four levels of visibility of attacks. Two major areas of security concern were identified: speed and volume of attacks; and complexity of multistage attacks. Hence, the Multistage Intrusion Detection and Prevention System (MIDaPS) that is designed here is made of two fundamental elements: a multistage attack engine that heavily depends on attack trees and a Denial of Service Engine. MIDaPS were tested and found to improve current intrusion detection and processing performances. After an intensive literature review, over 25 GB of data was collected on honeynets. This was then used to analyse the complexity of attacks in a series of experiments. Statistical and analytic methods were used to design the novel MIDaPS. Key findings indicate that an attack needs to be protected at 4 different levels. Hence, MIDaPS is built with 4 levels of protection. As, recent attack vectors use legitimate actions, MIDaPS uses a novel approach of attack trees to trace the attacker's actions. MIDaPS was tested and results suggest an improvement to current system performance by 84% whilst detecting DDOS attacks within 10 minutes.
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Pagna, Disso Jules F. "A novel intrusion detection system (IDS) architecture. Attack detection based on snort for multistage attack scenarios in a multi-cores environment." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/5248.
Full textAbstract:
Recent research has indicated that although security systems are developing,
illegal intrusion to computers is on the rise. The research conducted here
illustrates that improving intrusion detection and prevention methods is
fundamental for improving the overall security of systems.
This research includes the design of a novel Intrusion Detection System (IDS)
which identifies four levels of visibility of attacks. Two major areas of security
concern were identified: speed and volume of attacks; and complexity of
multistage attacks. Hence, the Multistage Intrusion Detection and Prevention
System (MIDaPS) that is designed here is made of two fundamental elements:
a multistage attack engine that heavily depends on attack trees and a Denial of
Service Engine. MIDaPS were tested and found to improve current intrusion
detection and processing performances.
After an intensive literature review, over 25 GB of data was collected on
honeynets. This was then used to analyse the complexity of attacks in a series
of experiments. Statistical and analytic methods were used to design the novel
MIDaPS.
Key findings indicate that an attack needs to be protected at 4 different levels.
Hence, MIDaPS is built with 4 levels of protection. As, recent attack vectors use
legitimate actions, MIDaPS uses a novel approach of attack trees to trace the
attacker¿s actions. MIDaPS was tested and results suggest an improvement to
current system performance by 84% whilst detecting DDOS attacks within 10
minutes.
13
Al-Azzani, Sarah. "Architecture-centric testing for security." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5206/.
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This thesis presents a novel architecture-centric approach, which uses Implied Scenarios (IS) to detect design-vulnerabilities in the software architecture. It reviews security testing approaches, and draws on their limitations in addressing unpredictable behaviour in the face of evolution. The thesis introduces the concept of Security ISs as unanticipated (possibly malicious) behaviours that indicate potential insecurities in the architecture. The IS approach uses the architecture as the appropriate level of abstraction to tackle the complexity of testing. It provides potential for scalability to test large scale complex applications. It proposes a three-phased method for security testing: (1) Detecting design-level vulnerabilities in the architecture in an incremental manner by composing functionalities as they evolve. (2) Classifying the impact of detected ISs on the security of the architecture. (3) Using the detected ISs and their impact to guide the refinement of the architecture. The refinement is test-driven and incremental, where refinements are tested before they are committed. The thesis also presents SecArch, an extension to the IS approach to enhance its search-space to detect hidden race conditions. The thesis reports on the applications of the proposed approach and its extension to three case studies for testing the security of distributed and cloud architectures in the presence of uncertainty in the operating environment, unpredictability of interaction and possible security IS.
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Bobusky, Sergej. "BlueJ interactive mode enhancement." Master's thesis, Vysoká škola ekonomická v Praze, 2014. http://www.nusl.cz/ntk/nusl-193923.
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An indispensable tool of any meaningful application development endeavour is an inte-grated development environment (IDE), and the same naturally applies for coding in Java programming language. There are many IDEs that are readily available to be used, though not all of them are well suited for elementary programming courses. BlueJ stands for a prominent exception here and its usage at hundreds of universities world-wide can be taken as a sound proof of this. The BlueJ value offering and traits are undisputable. That being said, we have to acknowledge that it is not perfect. One can iden-tify enhancements that need to be implemented for the tool to better support teaching ob-ject-oriented programming. The goal of this thesis is to identify the most prominent shortcomings of the BlueJ interac-tive mode and to design an implement features that will address them.
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Feske, Norman, and Christian Helmuth. "Design of the Bastei OS Architecture." Technische Universität Dresden, 2006. https://tud.qucosa.de/id/qucosa%3A26246.
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In the software world, high complexity of a problem solution comes along with a high risk for bugs and vulnerabilities. This correlation is particular perturbing for todays commodity operating systems with their tremendous complexity. The numerous approaches to increase the user’s confidence in the correct functioning of software comprise exhaustive tests, code auditing, static code analysis, and formal verification. Such quality-assurance measures are either rather shallow or they scale badly with increasing complexity.
The operating-system design presented in this paper focuses on the root of the problem by providing means to minimize the underlying system complexity for each security-sensitive application individually. On the other hand, we want to enable multiple applications to execute on the system at the same time whereas each application may have different functional requirements from the operating system. Todays operating systems provide a functional superset of the requirements of all applications and thus, violate the principle of minimalism for each single application. We resolve the conflict between the principle of minimalism and the versatility of the operating system by decomposing the operating system into small components and by providing a way to execute those components isolated and independent from each other. Components can be device drivers, protocol stacks such as file systems and network stacks, native applications, and containers for executing legacy software. Each application depends only on the functionality of a bounded set of components that we call application-specific trusted computing base (TCB). If the TCBs of two applications are executed completely isolated and independent from each other, we consider both TCBs as minimal.
In practice however, we want to share physical resources between multiple applications without sacrificing their independence. Therefore, the operating-system design has to enable the assignment of physical resources to each application and its TCB to maintain independence from other applications. Furthermore, rather than living in complete isolation, components require to communicate with each other to cooperate. The operating-system design must enable components to create other components and get them to know each other while maintaining isolation from uninvolved parts of the system.
First, we narrow our goals and pose our mayor challenges in Section 1. Section 2 introduces our fundamental concepts and protocols that apply to each component in the system. In Section 3, we present the one component that is mandatory part of each TCB, enables the bootstrapping of the system, and provides abstractions for the lowest-level resources. We exercise the composition of the presented mechanisms by the means of process creation in Section 4.
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Ding, Ke. "Architectures of DNA block copolymers." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=98214217X.
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Motii, Anas. "Engineering secure software architectures : patterns, models and analysis." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30274/document.
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De nos jours la plupart des organisations pour ne pas dire toutes, dépendent des technologies de l'information et de la communication (TIC) pour supporter plusieurs tâches et processus (quelquefois critiques). Cependant, dans la plupart des cas, les organisations et en particulier les petites entreprises accordent une importance limitée à l'information et à sa sécurité. En outre, sécuriser de tels systèmes est une tâche difficile en raison de la complexité et de la connectivité croissante du matériel et du logiciel dans le développement des TICs. Cet aspect doit alors être pris en compte dès les premières phases de conception. Dans ce travail, nous proposons une approche basée sur les modèles permettant de sécuriser des architectures logicielles en utilisant des patrons. Les contributions de ce travail sont : (1) un cadre de conception intégré pour la spécification et l'analyse d'architectures logicielles sécurisées, (2) une nouvelle méthodologie à base de modèles et de patrons et (3) une suite d'outils. Le fondement de l'approche associe un environnement basé sur des langages de modélisation pour la spécification et l'analyse des modèles d'architectures sécurisées et un dépôt à base de modèles d'artéfacts dédiés à la sécurité (modèle de patrons de sécurité, menaces et propriétés de sécurités) permettant la réutilisation de savoir-faire et de connaissances capitalisées. Pour cela on utilise des langages de modélisation pour la spécification et l'analyse de l'architecture. Le processus associé est constitué des activités suivantes : (a) analyse de risques à base de modèle appliquée à l'architecture du système pour identifier des menaces, (b) sélection et importation de modèles de patrons de sécurité, afin d'arrêter ou de mitiger les menaces identifiées, vers l'environnement de modélisation cible, (c) intégration de modèles de patrons dans le modèle d'architecture, (d) analyse de l'architecture obtenue par rapports aux exigences non-fonctionnelles et aux menaces résiduelles. Dans ce cadre, on s'est focalisé sur la vérification du maintien du respect des contraintes temporelles après application des patrons. La recherche de menaces résiduelles est réalisée à l'aide de techniques de vérification exploitant une représentation formelle des scénarios de menaces issus du modèle STRIDE et basés sur des référentiels de menaces existants (ex., CAPEC). Dans le cadre de l'assistance pour le développement des architectures sécurisées, nous avons implémenté une suite structurée d'outils autour du framework SEMCO et de la plateforme Eclipse Papyrus pour supporter les différentes activités basées sur un ensemble de langages de modélisation conforme à des standards OMG (UML et ses profils). Les solutions proposées ont été évaluées à travers l'utilisation d'un cas d'étude autour des systèmes SCADA (systèmes de contrôle et d'acquisition de données)Nowadays most organizations depend on Information and Communication Technologies (ICT) to perform their daily tasks (sometimes highly critical). However, in most cases, organizations and particularly small ones place limited value on information and its security. In the same time, achieving security in such systems is a difficult task because of the increasing complexity and connectivity in ICT development. In addition, security has impacts on many attributes such as openness, safety and usability. Thus, security becomes a very important aspect that should be considered in early phases of development. In this work, we propose an approach in order to secure ICT software architectures during their development by considering the aforementioned issues. The contributions of this work are threefold: (1) an integrated design framework for the specification and analysis of secure software architectures, (2) a novel model- and pattern-based methodology and (3) a set of supporting tools. The approach associates a modeling environment based on a set of modeling languages for specifying and analyzing architecture models and a reuse model repository of modeling artifacts (security pattern, threat and security property models) which allows reuse of capitalized security related know-how. The approach consists of the following steps: (a) model-based risk assessment performed on the architecture to identify threats, (b) selection and instantiation of security pattern models towards the modeling environment for stopping or mitigating the identified threats, (c) integration of security pattern models into the architecture model, (d) analysis of the produced architecture model with regards to other non-functional requirements and residual threats. In this context, we focus on real-time constraints satisfaction preservation after application of security patterns. Enumerating the residual threats is done by checking techniques over the architecture against formalized threat scenarios from the STRIDE model and based on existing threat references (e.g., CAPEC). As part of the assistance for the development of secure architectures, we have implemented a tool chain based on SEMCO and Eclipse Papyrus to support the different activities based on a set of modeling languages compliant with OMG standards (UML and its profiles). The assessment of our work is presented via a SCADA system (Supervisory Control And Data Acquisition) case study
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Tejeira-Davis, Eduardo. "Roots of modern Latin American architecture the Hispano-Caribbean region from the late 19th century to the recent past /." Heidelberg : Deutscher Akademischer Austauschdienst, 1987. http://books.google.com/books?id=LNBPAAAAMAAJ.
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Floc'h, Antoine. "Compilation optimisante pour processeurs extensibles." Phd thesis, Université Rennes 1, 2012. http://tel.archives-ouvertes.fr/tel-00726420.
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Les processeurs à jeu d'instructions spécifiques (ASIP) constituent un compromis entre les performances d'un circuit matériel dédié et la flexibilité d'un processeur programmable. Ces processeurs spécialisés peuvent être composés d'un processeur généraliste dont le jeu d'instructions est étendu par des instructions spécifiques à une ou plusieurs applications et qui sont exécutées sur une extension matérielle. On parle alors de processeurs extensibles. Si le coût de conception et de vérification de telles architectures est considérablement réduit en comparaison à une conception complète, la complexité est en partie reportée sur l'étape de compilation. En effet, le jeu d'instructions d'un processeur extensible est à la fois une entrée et une sortie du processus de compilation. Cette thèse propose plusieurs contributions pour guider le processus de conception de telles architectures à travers des techniques d'optimisations adaptées aux processeurs extensibles. La première de ces contributions consiste à sélectionner et à ordonnancer les instructions spécialisées VLIW en résolvant un unique problème d'optimisation de programmation par contraintes (CP). D'autre part, nous proposons une technique originale qui traite de l'interaction entre l'optimisation de code et l'extension de jeu d'instructions. Le principe est de transformer automatiquement le code original des nids de boucles d'un programme (à l'aide du modèle polyédrique) afin de sélectionner des instructions spécialisées vectorisables et dont les données temporaires, produites lors d'une itération de boucle, sont mémorisées sur l'extension matérielle du processeur.
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Bista, Sulabh. "Assessing the Physical Security of IDFs with PSATool: a Case Study." Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etd/2605.
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PSATool is a checklist-based, web-based application for assessing the physical security of Intermediate Distribution Frameworks. IDFs, or wiring closets, are an integral if often neglected component of information security. Earlier work by Timbs (2013) identified 52 IDF-related security requirements based on federal and international standards for physical security. PSATool refines Timbs’ prototype application for IDF assessment, extending it with support for mobile-device-based data entry.
PSATool was used to assess 25 IDFs at a regional university, a college and a manufacturing corporation, with an average of 9 minutes per assessment. Network managers and assessors involved in the assessments characterized PSATool as suitable for creating assessments, usable by IT department personnel, and accurate, in terms of its characterizations of IDF status.
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Hu, Ji. "A virtual machine architecture for IT-security laboratories." Phd thesis, [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980935652.
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Beckenkamp, Fábio Ghignatti. "A component architecture for artificial neural network systems." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964923580.
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Ericson, Fabian, and Sara Knutas. "Energieffektiva klimatskal i flerbostadshus: Tillämpning av nära-nollenergikrav." Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-66092.
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Hårdare energidirektiv från EU gällande energianvändning i byggnader har resulterat i Boverkets framtagande av Sveriges kommande nära-nollenergilagstiftning. Den kommande lagstiftningen kommer ur energisynpunkt innebära ett paradigmskifte för hur man projekterar och bygger nya byggnader i Sverige. I samarbete med WSP Sverige AB har detta arbete huvudsakligen undersökt potentialen att klara av denna omställning, genom att fokusera på minimering av energiförluster från transmission i en byggnads klimatskal. Arbetet innehåller en omprojektering av en specifik byggnads klimatskal. Vid framtagandet av detta klimatskal har olika konstruktionsalternativ simulerats och analyserats för att på ett kostnadseffektivt sätt avgöra den ambitionsnivå som krävs för att uppnå kraven i den kommande lagstiftningen. Utöver Boverkets kommande lagstiftning har även möjligheten att klara av viktade krav från miljöclassifieringssystemet Miljöbyggnad analyserats.
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Barnes, Andrew James. "A modular architecture for systematic text categorisation." Thesis, University of Huddersfield, 2013. http://eprints.hud.ac.uk/id/eprint/23292/.
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This work examines and attempts to overcome issues caused by the lack of formal standardisation when defining text categorisation techniques and detailing how they might be appropriately integrated with each other. Despite text categorisation’s long history the concept of automation is relatively new, coinciding with the evolution of computing technology and subsequent increase in quantity and availability of electronic textual data. Nevertheless insufficient descriptions of the diverse algorithms discovered have lead to an acknowledged ambiguity when trying to accurately replicate methods, which has made reliable comparative evaluations impossible. Existing interpretations of general data mining and text categorisation methodologies are analysed in the first half of the thesis and common elements are extracted to create a distinct set of significant stages. Their possible interactions are logically determined and a unique universal architecture is generated that encapsulates all complexities and highlights the critical components. A variety of text related algorithms are also comprehensively surveyed and grouped according to which stage they belong in order to demonstrate how they can be mapped. The second part reviews several open-source data mining applications, placing an emphasis on their ability to handle the proposed architecture, potential for expansion and text processing capabilities. Finding these inflexible and too elaborate to be readily adapted, designs for a novel framework are introduced that focus on rapid prototyping through lightweight customisations and reusable atomic components. Being a consequence of inadequacies with existing options, a rudimentary implementation is realised along with a selection of text categorisation modules. Finally a series of experiments are conducted that validate the feasibility of the outlined methodology and importance of its composition, whilst also establishing the practicality of the framework for research purposes. The simplicity of experiments and results gathered clearly indicate the potential benefits that can be gained when a formalised approach is utilised.
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Ball-Jones, Matthew Phillip. "Cascading cycloadditions for polycyclic sp³-rich architecture." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7986/.
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This thesis describes the formation of complex 3-dimensional polycyclic heterocycles via intramolecular Diels-Alder reactions of highly functionalised 4-aminooxazoles. The research presented discusses the advances made in the formation of alkene and alkyne tethered aminides alongside the synthesis of a range of 1,6- and 1,7- enynamides and the rapid transformation of such components into a densely functionalised core. The scope of this process, using both C-2 and C-5 dienophile-tethered oxazoles is discussed and the potential of 1,6-enynamides to undergo cycloisomerisation under gold-catalysis is unveiled. Mechanisms for both the cycloisomerisation and the oxazole formation are provided, with brief investigations into inner and outer sphere processes. The gold-catalysed formal (3+2)-dipolar cycloaddition of both aminides and dioxazoles with thioalkynes is also presented, with the production of a range of diversely functionalised 5-thiooxazoles. Preliminary investigations into the use of Bronsted acid catalysis for the synthesis of 4-thiooxazoles is discussed alongside mechanistic proposals.
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Götz, Sebastian, Claas Wilke, Sebastian Cech, and Uwe Aßmann. "Architecture and Mechanisms of Energy Auto-Tuning." Technische Universität Dresden, 2012. https://tud.qucosa.de/id/qucosa%3A26969.
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Energy efficiency of IT infrastructures has been a well-discussed research topic for several decades. The resulting approaches include hardware optimizations, resource management in operating systems, network protocols, and many more. The approach the authors present in this chapter is a self-optimization technique for IT infrastructures, which takes hard- and software components as well as users of software applications into account. It is able to ensure minimal energy consumption for a user request along with a set of non-functional requirements (e.g., the refresh rate of a data extraction tool). To optimize the ratio between utility of end users and the cost in terms of energy consumption, the system needs inherent variability leading to differentiated energy profiles and mechanisms to reconfigure the system at runtime. The authors present their approach called Energy Auto-Tuning (EAT) comprised of these mechanisms and an architecture which automatically tunes the energy efficiency of IT systems.
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Lievens, Halewijn, Freek Dendooven, and Marie Bemelmans. "A house, architecture for residents with dementia." TUDpress, 2019. https://tud.qucosa.de/id/qucosa%3A36605.
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As architects, we are involved in the conception of several ambitious projects for Huis Perrekes, an organization that initiated a place where people live with dementia. Our submission consists of a specific design approach for the refurbishment of an old villa and its garden into a house for residents with dementia. The core idea of the House is to reconnect the former villa and its new program to the social network of the village, and society in general. This is done by opening up the House and by creating a strong coherence between residents, family, people living nearby, artists and organizations. The concept allows several interior and exterior spaces to be shared in a significant way in a warm and secure environment. The principles of normalization of dementia, lived experience and focused care are the starting points of the project, which was developed and realized in close collaboration with Huis Perrekes, its director and many members of the staff.
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Dedenroth, Høj Louise. "Exploring the potentials of dementia village architecture." TUDpress, 2019. https://tud.qucosa.de/id/qucosa%3A36682.
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This paper is exploring dementia village architecture as a new architectural model, addressing the dementia care challenge, and linking it to the continuous process of deinstitutionalization, as a broader political, social, and cultural project. The paper will investigate the specific challenges and opportunities of the village model, through a case study of two exemplar cases of this model, asking, what are the properties of ‘villageness’, and to what degree are they each responding to an idea of ‘villageness’? This is explored through different scales of the village, going from ‘part’, to ‘relation between parts’ and ‘whole’, investigated through themes, related to the dementia care challenge; domestic interior, promenade, and community.
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Fatima, Arooj. "An integrated architecture for semantic search." Thesis, Anglia Ruskin University, 2016. https://arro.anglia.ac.uk/id/eprint/701475/1/Fatima_2016.pdf.
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meaningful manner such that software agents can search, reason with and manipulate this
data based on an understanding of its semantics. Accessing structured data from Linked
Open Datasets currently requires the use of formal query languages (such as SPARQL) which
poses significant difficulties for the end users.
One way to solve this problem is to provide a Natural Language Interface (NLI) to query
semantic data. The author undertook a comprehensive literature survey of existing semantic
search tools and performed a critical analysis to identify their strengths and weaknesses.
Although some of the existing tools support natural language, they are limited in their
techniques for query processing, result ranking, result readability and ease of integration
with other search tools. Based upon this analysis, this research proposes a new architecture
framework called SIRF (Semantic Information Retrieval Framework) for semantic search to
address these shortcomings.
This thesis provides a complete overview of the proposed framework, including: the
research challenges it addresses; its architecture; the techniques to map user queries to
SPARQL queries and to rank domains based on ontology concepts; and the evaluation of the
proposed system through a prototype. Evaluation of the prototype demonstrated the validity
of the approach. However the quality of resulting queries (and consequently retrieved
answers) depended upon the accuracy of the NLP parsers invoked by the prototype. Syntactically
well structured NL queries were correctly parsed, yielding better formed SPARQL
queries. Less structured NL queries performed poorly. As the framework is not tied to any
particular parser, result quality can be improved by utilising better parsers as they become
available.
The author believes that this work can be employed by a variety of end-user applications
that wish to utilise structured data.
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Khecharem, Amani. "MuVArch : une approche de méta-modélisation pour la représentation multi-vues des architectures hétérogènes embarqués." Thesis, Nice, 2016. http://www.theses.fr/2016NICE4019/document.
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Nous avons défini et réalisé avec l'approche MuVarch un environnement de (méta-)modélisation orientée vers la représentation multi-vues des architectures embarquées hétérogènes (de type "smartphone" par exemple). En plus de la vue architecturale de base, support de toutes les autres, on considère les vues "performance", "consommation", "température", ainsi que la vue fonctionnelle "applicative" pour fournir des scénarios comportementaux de fonctionnement de la plate-forme. Il était important de savoir décrire en MuVarch comment les vues se raccrochent à la vue de base architecturale, et comment elle se relient également entre elles (relation entre consommation énergétique et température par exemple). L'objectif ultime est d'utiliser ce framework multi-vues et les différentes informations apportées par chacune, pour savoir supporter des politiques alternatives de mapping/allocation des tâches applicatives sur les ressources de l'architecture (la définition de ces politiques restant extérieure à nos travaux de thèse). La représentation adéquate de cette relation d'allocation forme donc un des aspects importants de nos travauxWe introduced and realized with our MuVarch approach an heterogeneous (meta)modeling environment for multi-view representation of heterogeneous embedded architectures (of "smartphone" type for instance). In addition to the backbone architectural view supporting others, we considered performance, power, and thermal view. We introduced also the functional applicative view, to provide typical use cases for the architecture. It was important to describe in MuVarch our various views would connect to the basic one, and how they would mutually relate together as well (how temperature depends on power consumption for instance). The global objective was to let the framework consider alternative mapping/allocation strategies for applicative tasks on architectural resources (although the definition of such strategies themselves was out of the scope). The appropriate form of such an allocation relation, which may be quite involved, was thus an important aspect of this thesis
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Hao, Shilun. "IDS---Intelligent Dougong System: A Knowledge-based and Graphical Simulation of Construction Processes of China’s Song-style Dougong System." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1417702752.
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Sells, Chris. "Bridging object models : the faux-object idiom /." Full text open access at:, 1997. http://content.ohsu.edu/u?/etd,281.
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Staite, Christopher. "Identity management architecture and implementation : evaluation and improvement." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3388/.
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The definition of identity varies, and on the Internet it can be difficult to keep track of. Rather than trying to discuss the philosophical question of "who am I?", I like to define your digital identity as the information you place on the Internet (actively or passively). Managing this identity comes down to what information you give out and how to protect and modify that information. This thesis focuses on the latter half, the protection and modification of online identities and only skims the realms of protecting the information given to third parties. A distinct lack of drive in the development of technologies for managing authentication has dogged the Internet for some time. Numerous efforts have been made to simplify administration, but open protocols meant for simplifying the user experience have had little promotion and ended up forgotten or used to simplify administration. The question that needs to be answered, as usual in research, is why? Studies have shown that password fatigue is a very real issue and identity theft is increasing. Companies will always optimise their time and resources, but academics need to focus their work on optimising the user experience. In this thesis, a study of existing work produces a methodology to evaluate previous developments. This aids in determining where progress has been made in previous iterations and how, leading to a new development in identity management focussed on the needs of the end user. Finally, two implementations are created to realise this new form of identity management.
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Göbel, Steffen, Christoph Pohl, Ronald Aigner, Martin Pohlack, Simone Röttger, and Steffen Zschaler. "The COMQUAD Component Container Architecture and Contract Negotiation." Technische Universität Dresden, 2004. https://tud.qucosa.de/id/qucosa%3A26291.
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Component-based applications require runtime support to be able to guarantee non-functional properties. This report proposes an architecture for a real-time-capable, component-based runtime environment, which allows to separate non-functional and functional concerns in component-based software development. The architecture is presented with particular focus on three key issues: the conceptual architecture, an approach including implementation issues for splitting the runtime environment into a real-time-capable and a real-time-incapable part, and details of contract negotiation. The latter includes selecting component implementations for instantiantion based on their non-functional properties.
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Krstić, Miloš. "Request-driven GALS technique for datapath architectures." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=978773063.
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Schäfer, Olga [Verfasser]. "Poly(S-Alkylsulfonyl-L-Cysteine) in Modular Nanoparticle Synthesis : exploring key factors from disulfide stabilization, polypept(o)ide architectures to secondary structures / Olga Schäfer." Mainz : Universitätsbibliothek Mainz, 2019. http://d-nb.info/1194435742/34.
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Williams, Denver Robert Edward. "An adaptive integration architecture for software reuse." Doctoral diss., University of Central Florida, 2001. http://digital.library.ucf.edu/cdm/ref/collection/RTD/id/4167.
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University of Central Florida College of Engineering ThesisThe problem of building large, reliable software systems in a controlled, cost effective way, the so-called software crisis problem, is one of computer science's great challenges. From the very outset of computing as science, software reuse has been touted as a means to overcome the software crisis issue
Ph.D.
Doctorate;
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering and Computer Science
221 p.
xix, 221 leaves, bound : ill. ; 28 cm.
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Fernández-Busnadiego, Rubén. "Structural analysis of presynaptic architecture by cryoelectron tomography." kostenfrei, 2010. https://mediatum2.ub.tum.de/node?id=976427.
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Benamira, Messaoud. "Conducteurs mixtes nanostructurés pour les piles à combustible à oxyde solide (SOFC) : élaboration et performances de nouvelles architectures." Phd thesis, Paris 6, 2008. http://pastel.archives-ouvertes.fr/pastel-00004896.
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La réduction de la température de fonctionnement des piles à combustible à oxyde solide, de 1000°C à moins de 700°C, est la meilleure solution pour en diminuer les coûts de fabrication et augmenter la durée de vie. Néanmoins, l'abaissement de la température de fonctionnement s'accompagne d'une chute ohmique au sein de l'électrolyte et une augmentation des surtensions aux électrodes entraînant une diminution des performances de la pile. Dans cette optique, notre étude est centrée sur la recherche de nouveaux matériaux et de nouvelles architectures pour les piles SOFC. Des demi-cellules cathode/électrolyte avec des couches minces interfaciales de YSZ, LSM et La2NiO4 ont été élaborées sur des substrats denses de YSZ par différentes techniques (ALD, PVD et sol-gel). Ces demi-cellules ont été caractérisées par plusieurs techniques physico-chimiques (microscopie électronique à balayage, diffraction des rayons X) ; leurs propriétés électriques ont été étudiées par spectroscopie d'impédance. Une deuxième étude a été menée sur l'élaboration par ALD et les caractérisations physico-chimiques et électriques de couche minces d'oxyde zirconium dopé à l'oxyde d'indium (IDZ) présentant un gradient de composition, permettant de passer d'une conduction ionique à une conduction électronique. La dernière partie de ce travail a été dédiée à un nouveau matériau composite d'électrolyte, GDC-carbonates, dont l'étude des propriétés électriques et de vieillissement a montré des résultats encourageants.
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Schultz, Jörg. "SMART, a simple modular architecture research tool development and applications /." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=961722851.
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Buchty, Rainer. "Cryptonite a programmable crypto processor architecture for high bandwidth applications /." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966328108.
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Kolaric, Branko. "Foam films containig polyelectrolytes of different molecular architectures." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=96798131X.
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Zheng, Huanyang. "SOCIAL NETWORK ARCHITECTURES AND APPLICATIONS." Diss., Temple University Libraries, 2017. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/470889.
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Computer and Information SciencePh.D.
Rather than being randomly wired together, the components of complex network systems are recently reported to represent a scale-free architecture, in which the node degree distribution follows power-law. While social networks are scale-free, it is natural to utilize their structural properties in some social network applications. As a result, this dissertation explores social network architectures, and in turn, leverages these architectures to facilitate some influence and information propagation applications. Social network architectures are analyzed in two different aspects. The first aspect focuses on the node degree snowballing effects (i.e., degree growth effects) in social networks, which is based on an age-sensitive preferential attachment model. The impact of the initial links is explored, in terms of accelerating the node degree snowballing effects. The second aspect focuses on Nested Scale-Free Architectures (NSFAs) for social networks. The scale-free architecture is a classic concept, which means that the node degree distribution follows the power-law distribution. `Nested' indicates that the scale-free architecture is preserved when low-degree nodes and their associated connections are iteratively removed. NSFA has a bounded hierarchy. Based on the social network structure, this dissertation explores two influence propagation applications for the Social Influence Maximization Problem (SIMP). The first application is a friend recommendation strategy with the perspective of social influence maximization. For the system provider, the objective is to recommend a fixed number of new friends to a given user, such that the given user can maximize his/her social influence through making new friends. This problem is proved to be NP-hard by reduction from the SIMP. A greedy friend recommendation algorithm with an approximation ratio of $1-e^{-1}$ is proposed. The second application studies the SIMP with the crowd influence, which is NP-hard, monotone, non-submodular, and inapproximable in general graphs. However, since user connections in Online Social Networks (OSNs) are not random, approximations can be obtained by leveraging the structural properties of OSNs. The modularity, denoted by $\Delta$, is proposed to measure to what degree this problem violates the submodularity. Two approximation algorithms are proposed with ratios of $\frac{1}{\Delta+2}$ and $1-e^{-1/(\Delta+1)}$, respectively. Beside the influence propagation applications, this dissertation further explores three different information propagation applications. The first application is a social network quarantine strategy, which can eliminate epidemic outbreaks with minimal isolation costs. This problem is NP-hard. An approximation algorithm with a ratio of 2 is proposed through utilizing the problem properties of feasibility and minimality. The second application is a rating prediction scheme, called DynFluid, based on the fluid dynamics. DynFluid analogizes the rating reference among the users in OSNs to the fluid flow among containers. The third application is an information cascade prediction framework: given the social current cascade and social topology, the number of propagated users at a future time slot is predicted. To reduce prediction time complexities, the spatiotemporal cascade information (a larger size of data) is decomposed to user characteristics (a smaller size of data) for subsequent predictions. All these three applications are based on the social network structure.
Temple University--Theses
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Kayikci, Duygu y. "The Behavior of Moment Resisting Steel Frames Under Seismic Excitation with Variation of Geometric Dimensions of Architectural Setbacks." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_dissertations/583.
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This study investigates seismic response of the Moment-Resisting-Steel Frames (MRSF) with the architectural setbacks. The main objective of the study is to understand the variation of the elastic and inelastic, static and dynamic behavior with changes in the geometric dimensions of the tower portion. A second objective of the study is to determine the adequacy of the analysis procedures of various rigors, specified in current seismic design provision, in predicting those behaviors for MRSF with various size of setback. The analytical study is conducted using a regular and 16 irregular models to capture all possible combinations of configuration of setback in five-story, five-bay MRSFs. An irregular model is developed by gradually changing the horizontal and vertical dimensions of the tower portion of the regular base 2D frame-model. All models were designed for (a) equal global displacement and uniform distribution of inter-story drift under First-Mode (FM) lateral force distribution pattern at first significant yield, and (b) equal period of vibration at the first mode, using Nonlinear Static Seismic analysis procedure. Among the conclusions derived from the research is that the variation of (a) the elastic and inelastic inter-story drift, the ductility demand for the top three stories, and (b) the elastic and inelastic global displacement exhibited a pattern similar to the variation of the FM participation factor at the roof, PF1Φr,1. The square-root-of-sum-of-square (SRSS) distribution provided accurate estimates of elastic story shear and inter-story drift demand as well as the story yield strength and drift.
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Fröning, Holger. "Architectural improvements of interconnection network interfaces." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=985127449.
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Shaer, May. "The decorative architectural surfaces of Petra." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974415952.
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Zheng, Zhaoshi. "A FPGA-based architecture for LED backlight driving." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4514.
Full textAbstract:
In recent years, Light-emitting Diodes (LEDs) have become a promising candidate for backlighting Liquid Crystal Displays (LCDs). Compared with traditional Cold Cathode Fluorescent Lamps (CCFLs) technology, LEDs offer not only better visual quality, but also improved power efficiency. However, to fully utilized LEDs' capability requires dynamic independent control of individual LEDs, which remains as a challenging topic. A FPGA-based hardware system for LED backlight control is proposed in this work. We successfully achieve dynamic adjustment of any individual LED' intensity in each of the three color channels (Red, Green and Blue), in response to a real time incoming video stream. In computing LED intensity, four video content processing algorithms have been implemented and tested, including averaging, histogram equalization, LED zone pattern change detection and non-linear mapping. We also construct two versions of the system. The first employs an embedded processor which performs the above-mentioned algorithms on pre-processed video data; the second embodies the same functionality as the first on fixed hardware logic for better performance and power efficiency. The system servers as the backbone of a consolidated display, which yields better visual quality than common commercial displays, we build in collaboration with a group of researchers from CREOL at UCF.ID: 029094272; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (M.S.)--University of Central Florida, 2010.; Includes bibliographical references (p. 60-61).
M.S.
Masters
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Computer Science
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Hung, Victor C. "Robust dialog management through a context-centric architecture." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4639.
Full textAbstract:
This dissertation presents and evaluates a method of managing spoken dialog interactions with a robust attention to fulfilling the human user's goals in the presence of speech recognition limitations. Assistive speech-based embodied conversation agents are computer-based entities that interact with humans to help accomplish a certain task or communicate information via spoken input and output. A challenging aspect of this task involves open dialog, where the user is free to converse in an unstructured manner. With this style of input, the machine's ability to communicate may be hindered by poor reception of utterances, caused by a user's inadequate command of a language and/or faults in the speech recognition facilities. Since a speech-based input is emphasized, this endeavor involves the fundamental issues associated with natural language processing, automatic speech recognition and dialog system design. Driven by Context-Based Reasoning, the presented dialog manager features a discourse model that implements mixed-initiative conversation with a focus on the user's assistive needs. The discourse behavior must maintain a sense of generality, where the assistive nature of the system remains constant regardless of its knowledge corpus. The dialog manager was encapsulated into a speech-based embodied conversation agent platform for prototyping and testing purposes. A battery of user trials was performed on this agent to evaluate its performance as a robust, domain-independent, speech-based interaction entity capable of satisfying the needs of its users.ID: 029094516; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (Ph.D.)--University of Central Florida, 2010.; Includes bibliographical references (p. 280-301).
Ph.D.
Doctorate
Department of Electrical Engineering and Computer Science
Engineering and Computer Science
49
Rabadi, Yousef. "Building a secured XML real-time interactive data exchange architecture." Thesis, University of Huddersfield, 2011. http://eprints.hud.ac.uk/id/eprint/17824/.
Full textAbstract:
Nowadays, TCP and UDP communication protocols are the most widely used transport methods for carrying out XML data messages between different services. XML data security is always a big concern especially when using internet cloud. Common XML encryption techniques encrypt part of private sections of the XML file as an entire block of text and apply these techniques directly on them. Man-in-the-Middle and Cryptanalysts can generate statistical information, tap, sniff, hack, inject and abuse XML data messages. The purpose of this study is to introduce architecture of new approach of exchanging XML data files between different Services in order to minimize the risk of any alteration, data loss, data abuse, data misuse of XML critical business data information during transmission by implementing a vertical partitioning on XML files. Another aim is to create a virtual environment within internet cloud prior to data transmission in order to utilise the communication method and rise up the transmission performance along with resources utilisation and spreads the partitioned XML file (shredded) through several paths within multi agents that form a multipath virtual network. Virtualisation in cloud network infrastructure to take advantage of its scalability, operational efficiency, and control of data flow are considered in this architecture. A customized UDP Protocol in addition to a pack of modules in RIDX adds a reliable (Lossless) and Multicast data transmission to all nodes in a virtual cloud network. A comparative study has been made to measure the performance of the Real-time Interactive Data Exchange system (RIDX) using RIDX UDP protocol against standard TCP protocol. Starting from 4 nodes up to 10 nodes in the domain, the results showed an enhanced performance using RIDX architecture over the standard TCP protocol
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Essien, Joe. "Model driven validation approach for enterprise architecture and motivation extensions." Thesis, University of West London, 2015. https://repository.uwl.ac.uk/id/eprint/1269/.
Full textAbstract:
As the endorsement of Enterprise Architecture (EA) modelling continues to grow in diversity and complexity, management of its schema, artefacts, semantics and relationships has become an important business concern. To maintain agility and flexibility within competitive markets, organizations have also been compelled to explore ways of adjusting proactively to innovations, changes and complex events also by use of EA concepts to model business processes and strategies. Thus the need to ensure appropriate validation of EA taxonomies has been considered severally as an essential requirement for these processes in order to exert business motivation; relate information systems to technological infrastructure. However, since many taxonomies deployed today use widespread and disparate modelling methodologies, the possibility to adopt a generic validation approach remains a challenge. The proliferation of EA methodologies and perspectives has also led to intricacies in the formalization and validation of EA constructs as models often times have variant schematic interpretations. Thus, disparate implementations and inconsistent simulation of alignment between business architectures and heterogeneous application systems is common within the EA domain (Jonkers et al., 2003). In this research, the Model Driven Validation Approach (MDVA) is introduced. MDVA allows modelling of EA with validation attributes, formalization of the validation concepts and transformation of model artefacts to ontologies. The transformation simplifies querying based on motivation and constraints. As the extended methodology is grounded on the semiotics of existing tools, validation is executed using ubiquitous query language. The major contributions of this work are the extension of a metamodel of Business Layer of an EAF with Validation Element and the development of EAF model to ontology transformation Approach. With this innovation, domain-driven design and object-oriented analysis concepts are applied to achieve EAF model’s validation using ontology querying methodology. Additionally, the MDVA facilitates the traceability of EA artefacts using ontology graph patterns.