Dissertations / Theses on the topic 'SYSTEM FRAMEWORK'
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1
Ahmed, Nova. "Reliable middleware framework for RFID system." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/39516.
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The reliability of RFID systems depends on a number of factors including: RF interference, deployment environment, configuration of the readers, and placement of readers and tags. While RFID technology is improving rapidly, a reliable deployment of this technology is still a significant challenge impeding wide-spread adoption. This research investigates system software solutions for achieving a highly reliable deployment that mitigates inherent unreliability in RFID technology.
We have considered two different problem domains for large scale RFID deployment. One is item tracking and the other is guidance-monitoring. Item tracking considers applications that have statically placed RFID readers to observe the RFID tagged objects in motion. An airport scenario to observe the tagged baggage or warehouse scenarios to track the tagged goods are examples of item tracking applications. A self guided tour, search and rescue scenario or a visually impaired person looking for direction and guidance in a tagged environment are examples of item location applications. It is observed that there is a notion of path that follows the direction and flow of the mobile items in the item tracking applications and a path gets created along the direction and flow of the mobile object in item location applications. A system level knowledge of the data flow can benefit the system in different aspects such as improved reliability, resource management and real time response. We have designed and implemented an RFID middleware for item tracking: RF²ID (Reliable Framework for Radio Frequency Identification) to organize and support queries over data streams in an efficient manner. We have developed (1) a virtual reader abstraction to improve the potentially error-prone nature of reader generated data (2) a novel path abstraction to capture the logical flow of information among virtual readers. Prototype implementation using both RFID readers and simulated readers using an empirical model of RFID readers show that RF²ID is able to provide high reliability, support path-based object detection and use efficient resource management techniques. We propose a middleware solution that takes into account the data flow information for item location application that requires real time response.
The guidance-monitoring scenario considers mobile RFID readers that traverse in a tagged environment. We consider the scenario of an Assisted Living Center for elderly residents as a motivating guidance-monitoring application. The solution for guidance-monitoring system is called GuardianAngel. The application scenario considers a tagged indoor environment with residents having their own RFID readers to provide them with adequate information about the surroundings. The guidance and monitoring requirement can be conflicting. The guidance information requires very fine grain information about the environment to make proper decisions. On the other hand, the monitoring system must not have a fine grain knowledge which can introduce concerns such as privacy concerns. We consider this aspect during the design and implementation. The system is a two layered infrastructure that has the upper layer which is the monitoring layer. This layer is in charge of monitoring of the actors in the environment. The monitoring layer is physically a set of distributed virtual stations that have the knowledge about the environment. The environment itself is equipped with RFID tags. The residents of the environment have the mobile object that has a sensing element and a computing element (e.g., handhold device with a portable RFID reader) - the guidance server runs on this mobile object. The guidance server is in charge of making local decisions to the users. It is resource limited and asks for new information from the virtual stations as needed. The guidance server also provides the monitoring server with the information regarding the status of the mobile object. But the status information is not fine grain information - the guidance server wraps up the information over a period of time and over a larger region to hide the detailed information of the users.The system uses the logical path based abstraction to guide the users. We have implemented the real testbed using grid structured RFID devices along with scalability study using emulated RFID readers.
The basic contribution of our work is based on providing novel middleware solution that is able to serve the application taking into account the inherent unreliability of RFID technology. Our path abstraction that uses the physical flow of data as an ally to generate a logical system level flow enhances the performance in many ways.
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Liljenberg, Lars. "System Testing of Distributed Systems Using Node-Based Framework." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-260691.
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Existing methods for testing distributed systems are discussed and compared. A prototype of a new tool with support for executing distributed tests is developed and discussed. The new tool supports writing tests consisting of multiple nodes which can be coordinated from a master node through the use of remote procedure calls. A detailed description of the design and functionality of the tool is given, as well as an overview of how the tool itself was tested. In addition, a use case is presented where the tool is used for testing a conceptual distributed system, and the tool is found to work well for its intended purpose.
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Caffall, Dale Scott. "Conceptual framework approach for system-of-systems software developments." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Mar%5FCaffall.pdf.
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Thesis (M.S. in Software Engineering)--Naval Postgraduate School, March 2003.Thesis advisor(s): James Bret Michael, Man-Tak Shing. Includes bibliographical references (p. 83-84). Also available online.
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Churbanau, Dzmitry. "A Conceptual Framework for Specification of Network-Centric System Architectures." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32663.
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Software-based system architecture has been recognized as a foundation laying out the underpinnings that are critically important for successful engineering of large-scale complex systems. In recent years, architecting has played a more crucial role in engineering network-centric system of systems. The software paradigm has been shifting from treating software as a product (SaaP) to treating software as a service (SaaS). SaaS is also referred to as the Cloud Computing, where the term "cloud" is used as a metaphor for "network".
As the complexity of the architecture of network-centric software-based system of systems has increased, the description of such architecture has posed significant technical challenges. The U.S. Department of Defense (DoD) has developed the DoD Architecture Framework [DoDAF 2009a, DoDAF 2009b] for describing system architectures. IEEE proposes a Recommended Practice for Architectural Description of Software-Intensive Systems [IEEE 2000]. SEI provides high-level guidelines for Documenting Software Architectures [Clements et al 2003]. However, all of the diagrams proposed by DoD, IEEE, and SEI are two-dimensional static graphical and textual representations that do not reveal the dynamic characteristics of a system architecture.
This thesis presents a conceptual framework (CF) for specifying the architecture of a network-centric software-based system of systems. The developed CF provides the beginning part of a larger research effort. The main goal of the overall research is to employ the automation-based software paradigm and to automatically generate a visual simulation model of a system architecture, with which experiments can be conducted to assess the dynamic characteristics of that architecture. The CF, developed in the research described herein, enables the automatic generation of a visual simulation model representing a system architecture. The proposed CF is evaluated in half a dozen case studies to demonstrate that it provides the necessary elements for automatic generation of a simulation model as the description of a complex system of systems architecture.Master of Science
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Radhakrishnan, Sakthi Vignesh. "A framework for system fingerprinting." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47609.
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The primary objective of the proposed research is to develop a framework for smart and robust fingerprinting of networked systems. Many fingerprinting techniques have been proposed in the past, however most of these techniques are designed for a specific purpose, such as Operating System (OS) fingerprinting, Access Point (AP) fingerprinting, etc. Such standalone techniques often have limitations which render them dysfunctional in certain scenarios or against certain counter measures. In order to overcome such limitations, we propose a fingerprinting framework that can combine multiple fingerprinting techniques in a smart manner, using a centralized decision making engine. We believe that any given scenario or a counter measure is less likely to circumvent a group of diverse fingerprinting techniques, which serves as the primary motivation behind the aforementioned method of attack. Another major portion of the thesis concentrates on the design and development of a device and device type fingerprinting sub-module (GTID) that has been integrated into the proposed framework. This sub-module used statistical analysis of packet inter arrival times (IATs) to identify the type of device that is generating the traffic. This work also analyzes the performance of the identification technique on a real campus network and propose modifications that use pattern recognition neural networks to improve the overall performance. Additionally, we impart capabilities to the fingerprinting technique to enable the identification of 'Unknown' devices (i.e., devices for which no signature is stored), and also show that it can be extended to perform both device and device type identification.
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Sharma, Dhirendra S. M. Massachusetts Institute of Technology. "Enterprise Information Security Management Framework [EISMF]." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67568.
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Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 124-130).
There are several technological solutions available in the market to help organizations with information security breach detection and prevention such as intrusion detection and prevention systems, antivirus software, firewalls, and spam filters. There is no doubt in the fact that significant progress has been made in the technological side of information security. However, when we study causes of information security breaches, we find that a significant number are caused by non-technical reasons such as social engineering, theft of computing device or portable hard drive, human behavior, and human error. This leads us to conclude that information security should not be viewed through technology perspective only. Instead, a more holistic approach is required. This thesis provides a systems approach towards information security management and include technological, management and social aspects. This thesis starts with introduction especially background and motivation of the author, followed by literature research. Next, Enterprise Information Security Management Framework is presented leading to estimation of an organization's information security management maturity-level. Finally, conclusion and potential future work are presented.
by Dhirendra Sharma.
S.M.in Engineering and Management
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Jayanty, Suresh. "A Rule Based Expert System Framework for Small Water Systems." TopSCHOLAR®, 2005. http://digitalcommons.wku.edu/theses/502.
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Using an expert system to make decision making more reliable has been well studied and implemented over the years. For effective use, both data-driven questions (forward chaining) and goal-driven questions (backward chaining) need to be supported. Similarly, an avenue to update rules in the system as and when they change without major recompilation should be available. In this thesis we present an expert system framework that can help small water system operators make informed decisions regarding compliance with various EPA rules that may apply to them. To support both types of questions mentioned earlier, the system incorporates two expert system shells: JESS for answering data-driven questions such as "This is my reading for sample X. What needs to happen next?" and MANDARAX for goal-driven questions such as "We want to be compliant with the Total Coliform Rule. What do we need to do?" To make sure that rules are consistent and to support a straightforward rule-updating process, we use a native xml database to store the rules. All the rules are in XML format which ensures better symbiosis with other tools that support XML and allows one set of rules to be used for both JESS and MANDARAX.
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Kraft, Justin (Justin A. ). "A flexible design framework for autonomous mowing." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/70803.
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Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 93-95).
This work outlines the creation of a flexible design framework for autonomous mowing to meet changing customer needs and functionality across a spectrum of applications from residential areas to sport complexes. The thesis has the objective of creating an optimized architecture to meet a range of functionality that delivers value in diverse customer mission segments. Additionally, autonomous mowing is supported by fast moving technology domains that create the need for technology selection strategies that anticipate future trends in critical metrics. Currently an early dominant design has been produced, but increasing competition is actively advancing the current state of the art for autonomous mowing. An analysis to determine where the value lies in the system, much like the evolution of the PC, determines when to shift between modular and integrated designs. As designs become modular and flexible the importance of knowing which areas of the system capture value and lead to revenue is critical for a company's continued success in the domain. Using this framework Pareto frontiers were developed using genetic algorithms that clearly show the sensitivity between manufacturing costs and total life cycle cost to the consumer using 970 generations. A platform architecture analysis provided a 9% increase in a portfolio Net Present Value by determining an optimum commonality and differentiation plan over that of individually optimized customer segment offerings. This analysis also determines if an open source approach to innovation is viable for increased customer satisfaction while supporting increased manufacturer revenues (Hippel, 2005).
by Justin Kraft.
S.M.in Engineering and Management
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Apel, Marcus. "A 3d geoscience information system framework." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2009. http://nbn-resolving.de/urn:nbn:de:swb:105-3300478.
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Two-dimensional geographical information systems are extensively used in the geosciences to create and analyse maps. However, these systems are unable to represent the Earth's subsurface in three spatial dimensions. The objective of this thesis is to overcome this deficiency, to provide a general framework for a 3d geoscience information system (GIS), and to contribute to the public discussion about the development of an infrastructure for geological observation data, geomodels, and geoservices. Following the objective, the requirements for a 3d GIS are analysed. According to the requirements, new geologically sensible query functionality for geometrical, topological and geological properties has been developed and the integration of 3d geological modeling and data management system components in a generic framework has been accomplished. The 3d geoscience information system framework presented here is characterized by the following features: - Storage of geological observation data and geomodels in a XML-database server. According to a new data model, geological observation data can be referenced by a set of geomodels. - Functionality for querying observation data and 3d geomodels based on their 3d geometrical, topological, material, and geological properties were developed and implemented as plug-in for a 3d geomodeling user application. - For database queries, the standard XML query language has been extended with 3d spatial operators. The spatial database query operations are computed using a XML application server which has been developed for this specific purpose. This technology allows sophisticated 3d spatial and geological database queries. Using the developed methods, queries can be answered like: "Select all sandstone horizons which are intersected by the set of faults F". This request contains a topological and a geological material parameter. The combination of queries with other GIS methods, like visual and statistical analysis, allows geoscience investigations in a novel 3d GIS environment. More generally, a 3d GIS enables geologists to read and understand a 3d digital geomodel analogously as they read a conventional 2d geological map.
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Sharma, Naveen, and n/a. "A multi agent system framework for.NET." University of Canberra. Information Sciences & Engineering, 2005. http://erl.canberra.edu.au./public/adt-AUC20060726.153250.
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This thesis presents an approach to modeling Multi Agent Systems (MAS). A framework and its implementation are presented as an extension to .NET. A number of definitions of agents are evaluated for the purpose of a broad understanding of the term software agent. Software agent has been defined in MAS context and its characteristics are identified and implemented. Motivation factors for building framework for MAS have been discussed. A number of existing technologies are discussed and evaluated. A number of agent systems previously developed are also being discussed in the middle part of the thesis. A model software agent has been defined and its characteristics are divided in two basic categories essential and optional. Its implementation has been distributed into different components throughout the MAS framework. Some of these characteristics are jointly implemented by a number of components and others responsibility rest on the individual components. Detail working of the MAS framework (i.e. what to do, when to do) is explained as guide to develop MAS using MAS framework. The protocols followed by the framework components to make communication possible between them are discussed at components level. The required information for developing MAS using MAS framework are also discussed. It answers the why, when and how questions in regards to using MAS framework A case study on Dynamic Truck Scheduling (DTS) system is discussed, designed and implemented using the MAS framework. DTS System has been used as a prototype application to test and evaluate the framework. DTS also represents a model problem that can be answered by using MAS; complete in-depth details about the problem statement are discussed. It also discusses the design and implementation of the solution along with the test results of the framework. Possible future expansion is presented in light of a number of limitations known of the MAS framework. The code working behind the different components of the MAS framework is given in appendices. Some important standards of XML that are used to pass information between agents and MAS framework components are also given in the format of tables.
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Godfrey, Michael Wallace. "A framework for visual system configuration." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0017/NQ27654.pdf.
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Lindenmeyer, Daniel. "A framework for power system restoration." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0017/NQ56580.pdf.
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Khan, Ahmad Salman. "A Framework for Software System Handover." Doctoral thesis, KTH, Programvaruteknik och Datorsystem, SCS, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-122270.
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A transfer of a software system from a party responsible for its development to a party responsible for its maintenance is referred to as software system handover or transition. It does not only include a transfer of a software system or system part, but also a transfer of all the knowledge, experience and responsibilities that are required for managing the system during a software system lifecycle. It is a complex process overarching many different processes such as development, testing, version and configuration management, deployment, and maintenance, just to mention a few. Handover is a critical process in the software lifecycle and it is important that it is performed as smoothly as possible. It can become very expensive and protracted if the organizations are not well prepared for performing it. The productivity of the groups taking over the system and the quality of their outputs may be strongly dependent on how handover is performed. Overall, failing to transfer software systems may lead to loss of productivity, loss of maintainer credibility, loss of system and maintenance process quality, and sometimes, even loss of business. Therefore, a good handover process model is imperative and critical for planning for and managing transition and for alleviating many transition problems. Regrettably, the issue of the software handover is still a strongly under-researched and neglected domain. There still do not exist any up-to date handover process models that designate important features of a handover process. So far, the research community has not paid much attention to this particular process domain. The published handover process models are either too old or they deal with handover on a very general level. In this thesis, we suggest a framework for software system handover that provides a basis for creating handover process models. The framework is called EM3: Handover Framework and it is part of Evolution and Maintenance Management Model (EM3). The framework comprises six major parts: taxonomy of handover activities, handover contexts, handover types, handover roles, handover lifecycle roadmap, and handover guidelines. These parts may be combined in different ways for creating handover process models for specific handover contexts. The research method used was of qualitative character including explorative case studies and participatory studies. It is based on data collected within 61 companies during which the theory about the handover process domain was explored, evolved and evaluated. The primary research tools used were semi-structured interviews and observation. EM3: Handover Framework guides organizations in implementing their handover processes and in identifying problems and challenges they may face before, during and after the handover. Organizations can use it to conduct their own handover processes and researchers can further evaluate it in other industrial contexts, extend it, and/or use it for suggesting their own handover process models.QC 20130516
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Coffman, Thayne R. (Thayne Richard). "A framework for automated system testing." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/40188.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.Includes bibliographical references (leaves 70-73).
by Thayne R. Coffman.
M.Eng.
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Apel, Marcus. "A 3d geoscience information system framework." Doctoral thesis, Vandoeuvre-les-Nancy, INPL, 2004. https://tubaf.qucosa.de/id/qucosa%3A22479.
Full textAbstract:
Two-dimensional geographical information systems are extensively used in the geosciences to create and analyse maps. However, these systems are unable to represent the Earth's subsurface in three spatial dimensions. The objective of this thesis is to overcome this deficiency, to provide a general framework for a 3d geoscience information system (GIS), and to contribute to the public discussion about the development of an infrastructure for geological observation data, geomodels, and geoservices. Following the objective, the requirements for a 3d GIS are analysed. According to the requirements, new geologically sensible query functionality for geometrical, topological and geological properties has been developed and the integration of 3d geological modeling and data management system components in a generic framework has been accomplished. The 3d geoscience information system framework presented here is characterized by the following features: - Storage of geological observation data and geomodels in a XML-database server. According to a new data model, geological observation data can be referenced by a set of geomodels. - Functionality for querying observation data and 3d geomodels based on their 3d geometrical, topological, material, and geological properties were developed and implemented as plug-in for a 3d geomodeling user application. - For database queries, the standard XML query language has been extended with 3d spatial operators. The spatial database query operations are computed using a XML application server which has been developed for this specific purpose. This technology allows sophisticated 3d spatial and geological database queries. Using the developed methods, queries can be answered like: "Select all sandstone horizons which are intersected by the set of faults F". This request contains a topological and a geological material parameter. The combination of queries with other GIS methods, like visual and statistical analysis, allows geoscience investigations in a novel 3d GIS environment. More generally, a 3d GIS enables geologists to read and understand a 3d digital geomodel analogously as they read a conventional 2d geological map.
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Cernik, Jacob A. "Framework for an expert system generator." Akron, OH : University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1240579896.
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Thesis (M.S.)--University of Akron, Dept. of Computer Science, 2009."May, 2009." Title from electronic thesis title page (viewed 11/18/2009) Advisor, Chien-Chung Chan; Committee members, Kathy J. Liszka, Zhong-Hui Duan; Department Chair, Wolfgang Pelz; Dean of the College, Chand Midha; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
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Gooch, Joanna. "The global intelligent file system framework." Thesis, Swansea University, 2006. https://cronfa.swan.ac.uk/Record/cronfa42337.
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Since its inception, the Internet has grown rapidly in both size and importance in our everyday lives. The Internet today is the preliminary model of what is commonly called the global information infrastructure. However, at the moment this "infrastructure" is considered to be an addition to our computer, and is not an integrated part of a file system which is essentially a "local information infrastructure" of a computer. Advancements in the sizes of disks in computers, network bandwidth and the types of media available mean users now keep large amounts of files in their personal data storage spaces, with little or no additional support for the organisation, searching or sharing of this data. The hierarchical model of file system storage is no longer the most effective way of organising and categorising files and information. Relying largely on the user, rather than the computer, being efficient and organised its inflexible nature renders it unsuitable for the meaningful coordination of an increasing bulk of divergent file types that users deal with on a daily basis. The work presented in this thesis describes a new paradigm for file storage, management and retrieval. Providing globally integrated document emplacement and administration, the GIFS (Global Intelligent File System) framework offers the necessary architecture for transparently directing the storage, access, sharing, manipulation, and security of files across interconnected computers. To address the discrepancy between user actions and computer actions, GIFS provides each user with a "Virtual Secretary" to reduce the cognitive workload and remove the time-consuming task of information organisation from the user. The Secretary is supported by a knowledge base and a collection of intelligent agents, which are programs that manage and process the data collected, and work behind the scenes aiding gradual proliferation of knowledge. The Virtual Secretary is responsible for providing fast and accurate assistance to aid users who wish to create, store, retrieve, share, secure and collaborate on their files. Through both system prototyping and performance simulation it is demonstrated that it is desirable as well as feasible to deploy a knowledge base in supporting an intelligent user interface that acts like a human assistant who handles paperwork, looks after filing, security and so on. This work provides the contribution of a new framework and architecture to the field of files systems and document management as well as focusing on reducing the burden placed upon users through everyday usage of computer systems. Such a framework has the potential to be evolved into a highly intelligent assistant to a user over a period of service and the introduction of additional agents, and provides the basis for advancements in file system and organisational technologies.
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Brancovici, George-Sava. "Architecture and framework for trustworthy autonomous systems /." München : Verl. Dr. Hut, 2009. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=017311064&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Brancovici, George-Sava. "Architecture and framework for trustworthy autonomous systems." München Verl. Dr. Hut, 2008. http://d-nb.info/993259138/04.
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Larson, Bradley Jared. "Mathematical Framework for Early System Design Validation Using Multidisciplinary System Models." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3000.
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A significant challenge in the design of multidisciplinary systems (e.g., airplanes, robots, cell phones) is to predict the effects of design decisions at the time these decisions are being made early in the design process. These predictions are used to choose among design options and to validate design decisions. System behavioral models, which predict a system's response to stimulus, provide an analytical method for evaluating a system's behavior. Because multidisciplinary systems contain many different types of components that have diverse interactions, system behavioral models are difficult to develop early in system design and are challenging to maintain as designs are refined. This research develops methods to create, verify, and maintain multidisciplinary system models developed from models that are already part of system design. First, this research introduces a system model formulation that enables virtually any existing engineering model to become part of a large, trusted population of component models from which system behavioral models can be developed. Second, it creates a new algorithm to efficiently quantify the feasible domain over which the system model can be used. Finally, it quantifies system model accuracy early in system design before system measurements are available so that system models can be used to validate system design decisions. The results of this research are enabling system designers to evaluate the effects of design decisions early in system design, improving the predictability of the system design process, and enabling exploration of system designs that differ greatly from existing solutions.
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Wong, Wing-ki Vicky. "An immunity-based distributed multiagent control framework." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37314348.
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Boronas, Andreas. "Ein Framework für verteilte Ereignisbeobachtung." [S.l. : s.n.], 2003. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10519012.
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Srinivasan, K. "Design and development of an enterprise modeling framework." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/8285.
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Harper, Matthew A. M. (Matthew Albert MacLennan). "Valuing flexibility in product platforms : an analytical framework." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67556.
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Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 81-83).
"The intuitive mind is a sacred gift and the rational mind is a faithful servant. We have created a society that honours the servant and has forgotten the gift." - Einstein. "Whatever you can do, or dream you can, begin it. Boldness has genius, power, and magic in it." - Goethe. It is only with considerable help that I have traversed the steps that culminated in my signature on the cover of this document. I'd like to thank my advisor, Richard de Neufville, for his insightful guidance in completing this work. This document is more compelling, more cohesive, and more comprehensive than it could ever have been without his help. To the many wonderful professors, instructors and lecturers who I have learned from during my time at MIT, I thank you for sharing your wisdom with me. In particular, to Michael Davies and Tom Steenburgh - thank you for leading me to discover that it is neither the courses, the research, nor the degree that make this journey worthwhile; rather, that the greatest gift of my time here will be a lifetime of intellectual curiosity and the boldness to take on incredible projects. To Jim Utterback - thank you for leading me to appreciate that intellectual, technological and managerial practice are, at their core, humanistic pursuits. Finally, thank you to Pat Hale and the SDM staff for the incredible job you do in pulling together the phenomenal System Design and Management Fellows program. To the friends that I've made at MIT, thanks for continuously pushing me to learn more, work harder, and be smarter; I look forward to hearing about, and sharing in, the incredible exploits that await you in years to come. To my friends in Vancouver and scattered around the world, know that I draw strength from your existence, and that I look forward to seeing you again soon. Finally and most importantly: To my family. Thank you for your unwavering support as I have pursued my studies at MIT. In many ways, I embarked on this journey on your behalf; I hope that my experience here will, in the end, enrich all of our lives together.
by Matthew A. M. Harper.
S.M.in Engineering and Management
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Goel, Gautam. "Dynamic flux estimation a novel framework for metabolic pathway analysis /." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31769.
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Thesis (Ph.D)--Biomedical Engineering, Georgia Institute of Technology, 2010.Committee Chair: Voit, Eberhard O.; Committee Member: Butera, Robert; Committee Member: Chen, Rachel; Committee Member: Kemp, Melissa; Committee Member: Neves, Ana Rute. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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de, Groot Martin Computer Science & Engineering Faculty of Engineering UNSW. "Reasoning about designs: a framework for coupling formal developments and system management." Awarded by:University of New South Wales. School of Computer Science and Engineering, 2006. http://handle.unsw.edu.au/1959.4/28347.
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This thesis presents a framework for formal system development. The framework is called `RD' which is short for `Reasoning about Designs'. RD integrates proof, development and diagnostic modes of reasoning. Many commonly studied formalisms are shown to be consistent with this framework. A large example based on an industrial problem is given to demonstrate RD. The integration of system design and management is achieved by unifying formal software engineering methods and model-based reasoning. RD formally specifies a complete toolkit for performing system development and then re-using the development as the system description for diagnostic reasoning. RD does not restrict the contributing system analysis methods, rather it maps out and defines the entities and relations common to both. The framework is, in principle, extensible to support other forms of reasoning. The ground technical mechanism of the framework is a novel view of formal system development based on a general implementation relation. Implementation relations are widely studied in formal methods in software engineering where they are often referred to as `refinement'. RD allows refinement relations to be defined in a way that makes expected behaviours and faults of system implementations explicit. Furthermore, a case is made that all well known forms of refinement implicitly support diagnostic reasoning as they can be restated within the framework. RD is an integrated and completely rigorous approach to the core system building tasks of design and management. Despite the large amount of technical detail, the following discussion can be seen as raising many issues that relate to engineering in general. In particular, a formal engineering process should have benefits beyond just the delivery of systems that satisfy their specifications.
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Warren, Bradley R. "A framework for software reuse in safety-critical system of systems." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Mar%5FWarren.pdf.
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Thesis (M.S. in Software Engineering)--Naval Postgraduate School, March 2008.Thesis Advisor(s): Michael, James B. ; Shing, Mantak. "March 2008." Description based on title screen as viewed on May 16, 2008. Includes bibliographical references (p. 77-79). Also available in print.
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Hsieh, Sheau-Ling 1952. "Distributed multimedia collaborative system framework for tele-healthcare remote consultation systems." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/284034.
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The Remote Consultation and Diagnosis (RCD) in Global Picture Archiving and Communication System (Global PACS) is a unique suite of multimedia telemedicine applications developed at the University of Arizona. The applications support real-time patients' data, image files, audio and video consultation and diagnosis annotation exchanges. The RCD enables joint collaboration between pathologists, radiologists, or physicians while they are at distant geographical locations. This project provides four RCD scenarios, i.e., Case Review, Case Acquire, Store and Forward Analysis, as well as Interactive Diagnosis and Consultation. The RCD Global PACS environment consists of heterogeneous, autonomous, and legacy resources. The Common Object Request Broker Architecture (CORBA), Java Database Connectivity (JDBC), and Java language provide the capability to combine the RCD Global PACS resources into an integrated, interoperable, and scalable system. The underneath technology, including IDL, ORB, Event Service, IIOP, JDBC/ODBC, legacy system wrapping and Java implementation are explored. This distributed collaborative CORBA/JDBC based framework will challenge the advanced, medical information management requirements. It also makes the RCD Global PACS both hardware and software technologically independent. As our research and development extend, we will continue to incorporate the latest advances in computer technology. RCD Global PACS is not another new tool in telemedicine, but rather a new paradigm for the delivery of health services that requires process reengineering, cultural changes, as well as organizational changes. It is a whole new way of practicing in telemedicine. We ensure that the RCD Global PACS project has long-term, comprehensive solutions for today and tomorrow's healthcare needs.
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London, Brian (Brian N. ). "A model-based systems engineering framework for concept development." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/70822.
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Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 148-151).
The development of increasingly complex, innovative systems under greater constraints has been the trend over the past several decades. In order to be successful, organizations must develop products that meet customer needs more effectively than the competitors' alternatives. The development of these concepts is based on a broad set of stakeholder objectives, from which alternative designs are developed and compared. When properly performed, this process helps those involved understand the benefits and drawbacks of each option. This is crucial as firms need to effectively and quickly explore many concepts, and easily determine those most likely to succeed. It is generally accepted that a methodical design approach leads to the reduction in design flaws and cost over a product's life cycle. Several techniques have been developed to facilitate these efforts. However, the traditional tools and work products are isolated, and require diligent manual inspection. It is expected that the effectiveness of the high-level product design and development will improve dramatically through the adoption of computer based modeling and simulation. This emerging capability can mitigate the challenges and risks imposed by complex systems by enforcing rigor and precision. Model-based systems engineering (MBSE) is a methodology for designing systems using interconnected computer models. The recent proliferation of MBSE is evidence of its ability to improve the design fidelity and enhance communication among development teams. Existing descriptions of leveraging MBSE for deriving requirements and system design are prevalent. However, very few descriptions of model-based concept development have been presented. This may be due to the lack of MBSE methodologies for performing concept development. Teams that attempt a model-based approach without well defined, structured strategy are often unsuccessful. However, when MBSE is combined with a clear methodology, designs can be more efficiently generated and evaluated. While it may not be feasible to provide a "standard" methodology for concept development, a framework is envisioned that incorporates a variety of methods and techniques. This thesis proposes such a framework and presents an example based on a simulated concept development effort.
by Brian London.
S.M.in Engineering and Management
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Lee, Bin Hong Alex. "Empty container logistics optimization : an implementation framework and methods." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90715.
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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2014.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 68-70).
Empty container logistics is a huge cost component in an ocean carrier's operations. Managing this cost is important to ensure profitability of the business. This thesis proposes a 3-stage framework to handle empty container logistics with cost management as the objective. The first stage studies the forecasting of laden shipment demand, which provides the empty container supply requirement. Based on the supply needs, the problem of optimizing the fleet size was then addressed by using an inventory model to establish the optimal safety stock level. Simulations were used to understand the sensitivity of safety stock to desired service level. The final stage involves using mathematical programming to optimize repositioning costs incurred by carriers to ship empty containers to places which need them due to trade imbalance. At the same time, costs that are incurred due to leasing and storage are considered. A comparison between just-in-time and pre-emptive replenishment was performed and impact due to uncertainties is investigated. The framework is then implemented in a Decision Support System for an actual ocean carrier and is used to assist the empty container logistics team to take the best course of action in daily operations. The results from the optimizations show that there are opportunities for the carrier to reduce its fleet size and cut empty container logistics related costs.
by Bin Hong Alex Lee.
S.M. in Engineering and Management
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Lee, Hyun Seop. "Requirement analysis framework of naval military system for expeditionary warfare." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50403.
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Military systems are getting more complex due to the demands of various types of missions, rapidly evolving technologies, and budgetary constraints. In order to support complex military systems, there is a need to develop a new naval logistic asset that can respond to global missions effectively. This development is based on the requirement which must be satisfice-able within the budgetary constraints, address pressing real world needs, and allow designers to innovate. This research is conducted to produce feasible and viable requirements for naval logistic assets in complex military systems. The process to find these requirements has diverse uncertainties about logistics, environment and missions. To understand and address these uncertainties, this research includes instability analysis, operational analysis, sea state analysis and disembarkation analysis. By the adaptive Monte-Carlo simulation with maximum entropy, uncertainties are considered with corresponding probabilistic distribution. From Monte-Carlo simulation, the concept of Probabilistic Logistic Utility (PLU) was created as a measure of logistic ability. To demonstrate the usability of this research, this procedure is applied to a Medium Exploratory Connector (MEC) which is an Office of Naval Research (ONR) innovative naval prototype. Finally, the preliminary design and multi-criteria decision-making method become capable of including requirements considering uncertainties.
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da, Silva Dilma Menezes. "A framework for building complex systems." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/9229.
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Wong, Wing-ki Vicky, and 黃穎琪. "An immunity-based distributed multiagent control framework." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37314348.
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McDonald, Christopher Ernest. "Framework for a visual energy use system." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1892.
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Fabbri, Michele. "A framework for cyber-physical system simulation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
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In these last years, systems engineering has became one of the major research domains. The complexity of systems has increased constantly and nowadays Cyber-Physical Systems (CPS) are a category of particular interest: these, are systems composed by a cyber part (computer-based algorithms) that monitor and control some physical processes. Their development and simulation are both complex due to the importance of the interaction between the cyber and the physical entities: there are a lot of models written in different languages that need to exchange information among each other. Normally people use an orchestrator that takes care of the simulation of the models and the exchange of informations. This orchestrator is developed manually and this is a tedious and long work. Our proposition is to achieve to generate the orchestrator automatically through the use of Co-Modeling, i.e. by modeling the coordination. Before achieving this ultimate goal, it is important to understand the mechanisms and de facto standards that could be used in a co-modeling framework. So, I studied the use of a technology employed for co-simulation in the industry: FMI. In order to better understand the FMI standard, I realized an automatic export, in the FMI format, of the models realized in an existing software for discrete modeling: TimeSquare. I also developed a simple physical model in the existing open source openmodelica tool. Later, I started to understand how works an orchestrator, developing a simple one: this will be useful in future to generate an orchestrator automatically.
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Lindholm, Jonas. "Graphical Interface Framework for Control System Environments." Thesis, Uppsala University, Department of Information Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-108398.
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Industry machines and vehicles are becoming more and more complex and are today often operated through a control system. Such control system must be able to operate in rough environments. It is also becoming more and more common that these systems make use of a display to present and control the system. In such case a graphical user interface (GUI) will be built. Controller Development System (CoDeSys) is a development environment platform for control systems. It handles development of automation as well as GUIs.
Today CoDeSys exists in two versions, CoDeSys V2 and CoDeSys V3. This thesis conducts a qualitative evaluation and comparison of these to platforms. The evaluation covers the basic functionality of the two platforms, the development environments, how custom elements can be built and integrated, and a performance test. The focus of the evaluation is put on how custom element development is done and the performance test. The comparison shows that both platforms support development of custom elements, but also that the newer version of CoDeSys taken the process one step further. As for performance the result shows that unless GUIs are built in certain ways the working load for the control system will be too high.
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Pradhan, Anu Raj. "INFRASTRUCTURE MANAGEMENT INFORMATION SYSTEM FRAMEWORK FOR DISASTERS." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-08122003-172045/.
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Three-tiered enterprise GIS architecture offers a robust, efficient, and secure mechanism as a potential revolution to disaster management systems. This paper addresses the severe limitations of existing disaster management systems and proposes an integrated management information system as an alternative. The value of such a 3-tiered enterprise GIS is its ability to function as reliable and efficient system during a disaster. Issues related to data storage, handling, timely distribution of processing power, efficient retrieval and dissemination of information, and data security against unauthorized access have to addressed using the state-of-the-art technology. Recent advancements in (1) standardized data specification, (2) middleware services, and (3) web-enabled distributed computing provide key resources to design and implement a tool of unprecedented flexibility and capacity for disaster management. This paper presents the critical details of such a system.
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Knahl, Martin Hans. "A generic network and system management framework." Thesis, University of Plymouth, 2002. http://hdl.handle.net/10026.1/1824.
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Networks and distributed systems have formed the basis of an ongoing communications revolution that has led to the genesis of a wide variety of services. The constantly increasing size and complexity of these systems does not come without problems. In some organisations, the deployment of Information Technology has reached a state where the benefits from downsizing and rightsizing by adding new services are undermined by the effort required to keep the system running. Management of networks and distributed systems in general has a straightforward goal: to provide a productive environment in which work can be performed effectively. The work required for management should be a small fraction of the total effort. Most IT systems are still managed in an ad hoc style without any carefully elaborated plan. In such an environment the success of management decisions depends totally on the qualification and knowledge of the administrator. The thesis provides an analysis of the state of the art in the area of Network and System Management and identifies the key requirements that must be addressed for the provisioning of Integrated Management Services. These include the integration of the different management related aspects (i.e. integration of heterogeneous Network, System and Service Management). The thesis then proposes a new framework, INSMware, for the provision of Management Services. It provides a fundamental basis for the realisation of a new approach to Network and System Management. It is argued that Management Systems can be derived from a set of pre-fabricated and reusable Building Blocks that break up the required functionality into a number of separate entities rather than being developed from scratch. It proposes a high-level logical model in order to accommodate the range of requirements and environments applicable to Integrated Network and System Management that can be used as a reference model. A development methodology is introduced that reflects principles of the proposed approach, and provides guidelines to structure the analysis, design and implementation phases of a management system. The INSMware approach can further be combined with the componentware paradigm for the implementation of the management system. Based on these principles, a prototype for the management of SNMP systems has been implemented using industry standard middleware technologies. It is argued that development of a management system based on Componentware principles can offer a number of benefits. INSMware Components may be re-used and system solutions will become more modular and thereby easier to construct and maintain.
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Patel, Amit R. (Amit Rajinikant). "A framework for the global computing system." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43486.
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Wang, Ding Ph D. Massachusetts Institute of Technology. "Adaptive rapid environmental assessment system simulation framework." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33592.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.Includes bibliographical references (leaves 170-171).
Adaptive Rapid Environmental Assessment (AREA) is a new concept for minimizing the non model-based sonar performance prediction uncertainty and improving the model-based sonar performance by adaptive and rapid in situ measurement in the ocean environment. In this thesis, a possible structure of the AREA system has been developed; an AREA System Simulation Framework has been constructed using C++, which can simulate how AREA system will work and be utilized to determine the optimal or sub-optimal sampling strategies. A user's manual for the simulation framework, and specifications of all important C++ classes are included.
by Ding Wang.
S.M.
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Iacobucci, Joseph Vincent. "Rapid Architecture Alternative Modeling (RAAM): a framework for capability-based analysis of system of systems architectures." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43697.
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The current national security environment and fiscal tightening make
it necessary for the Department of Defense to transition away from a
threat based acquisition mindset towards a capability based approach
to acquire portfolios of systems. This requires that groups of
interdependent systems must regularly interact and work together as
systems of systems to deliver desired capabilities. Technological
advances, especially in the areas of electronics, computing, and
communications also means that these systems of systems are tightly
integrated and more complex to acquire, operate, and manage. In
response to this, the Department of Defense has turned to system
architecting principles along with capability based analysis. However,
because of the diversity of the systems, technologies, and
organizations involved in creating a system of systems, the design
space of architecture alternatives is discrete and highly
non-linear. The design space is also very large due to the hundreds of
systems that can be used, the numerous variations in the way systems
can be employed and operated, and also the thousands of tasks that are
often required to fulfill a capability. This makes it very difficult
to fully explore the design space. As a result, capability based
analysis of system of systems architectures often only considers a
small number of alternatives. This places a severe limitation on the
development of capabilities that are necessary to address the needs of
the war fighter.
The research objective for this manuscript is to develop a Rapid
Architecture Alternative Modeling (RAAM) methodology to enable
traceable Pre-Milestone A decision making during the conceptual phase
of design of a system of systems. Rather than following current trends
that place an emphasis on adding more analysis which tends to increase
the complexity of the decision making problem, RAAM improves on
current methods by reducing both runtime and model creation
complexity. RAAM draws upon principles from computer science, system
architecting, and domain specific languages to enable the automatic
generation and evaluation of architecture alternatives. For example,
both mission dependent and mission independent metrics are
considered. Mission dependent metrics are determined by the
performance of systems accomplishing a task, such as Probability of
Success. In contrast, mission independent metrics, such as
acquisition cost, are solely determined and influenced by the other
systems in the portfolio. RAAM also leverages advances in parallel
computing to significantly reduce runtime by defining executable
models that are readily amendable to parallelization. This allows the
use of cloud computing infrastructures such as Amazon's Elastic
Compute Cloud and the PASTEC cluster operated by the Georgia Institute
of Technology Research Institute (GTRI). Also, the amount of data that
can be generated when fully exploring the design space can quickly
exceed the typical capacity of computational resources at the
analyst's disposal. To counter this, specific algorithms and
techniques are employed. Streaming algorithms and recursive
architecture alternative evaluation algorithms are used that reduce
computer memory requirements. Lastly, a domain specific language is
created to provide a reduction in the computational time of executing
the system of systems models. A domain specific language is a small,
usually declarative language that offers expressive power focused on a
particular problem domain by establishing an effective means to
communicate the semantics from the RAAM framework. These techniques
make it possible to include diverse multi-metric models within the
RAAM framework in addition to system and operational level trades.
A canonical example was used to explore the uses of the
methodology. The canonical example contains all of the features of a
full system of systems architecture analysis study but uses fewer
tasks and systems. Using RAAM with the canonical example it was
possible to consider both system and operational level trades in the
same analysis. Once the methodology had been tested with the canonical
example, a Suppression of Enemy Air Defenses (SEAD) capability model
was developed. Due to the sensitive nature of analyses on that
subject, notional data was developed. The notional data has similar
trends and properties to realistic Suppression of Enemy Air Defenses
data. RAAM was shown to be traceable and provided a mechanism for a
unified treatment of a variety of metrics. The SEAD capability model
demonstrated lower computer runtimes and reduced model creation
complexity as compared to methods currently in use. To determine the
usefulness of the implementation of the methodology on current
computing hardware, RAAM was tested with system of system architecture
studies of different sizes. This was necessary since system of systems
may be called upon to accomplish thousands of tasks. It has been
clearly demonstrated that RAAM is able to enumerate and evaluate the
types of large, complex design spaces usually encountered in
capability based design, oftentimes providing the ability to
efficiently search the entire decision space. The core algorithms for
generation and evaluation of alternatives scale linearly with expected
problem sizes. The SEAD capability model outputs prompted the
discovery a new issue, the data storage and manipulation requirements
for an analysis. Two strategies were developed to counter large data
sizes, the use of portfolio views and top `n' analysis. This proved
the usefulness of the RAAM framework and methodology during
Pre-Milestone A capability based analysis.
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Türke, Ralf-Eckhard. "eGovernance : foundation and framework /." Bamberg, 2007. http://aleph.unisg.ch/hsgscan/hm00200998.pdf.
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KUO, FENG-YANG. "AN ARCHITECTURE FOR DIALOGUE MANAGEMENT SUPPORT IN INFORMATION SYSTEMS (FRAMEWORK, MODELING DYNAMIC, METHODOLOGY)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187932.
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The management of man-computer dialogues involves policies, procedures, and methodologies that enable users and designers to control, monitor, and enhance the user-computer interface. Effective dialogue management can be facilitated by a computer-aided work-bench of dialogue management tools that integrate pertinent environmental attributes into executable dialogue forms. Consequently, a methodology for generating dialogue designs is required. This research presents a framework for modeling user-computer interactions, or dialogues. The approach taken herein focuses on analysis of task, user, and information technology attributes. This analytical framework isolates dialogue entities and entity groupings. Together, these entities and their groupings suggest a language for information presentation and elicitation in the user-computer dialogue process. As a result, alternative dialogue models can be specified independent of hardware and software technologies. Furthermore, these models can be evaluated to ensure completeness, consistency, and integrity. Under this framework, various dialogue management functions can be integrated into a generalized dialogue management environment. Such an environment facilitates the transformation of task, user, and information technology attributes into executable dialogue definitions. The architecture of this environment is characterized by functionally layered and modularized software tools for dialogue management. The implementation of the proposed methodologies and the dialogue management architecture results in a set of dialogue management design facilities. These facilities foster effective management of dialogues within organizations and lead to a better understanding of the dialogue process.
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Gallatin, Douglas S. "Twill: A Hybrid Microcontroller-FPGA Framework for Parallelizing Single- Threaded C Programs." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1161.
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Increasingly System-On-A-Chip platforms which incorporate both micropro- cessors and re-programmable logic are being utilized across several fields ranging from the automotive industry to network infrastructure. Unfortunately, the de- velopment tools accompanying these products leave much to be desired, requiring knowledge of both traditional embedded systems languages like C and hardware description languages like Verilog. We propose to bridge this gap with Twill, a truly automatic hybrid compiler that can take advantage of the parallelism inherent in these platforms. Twill can extract long-running threads from single threaded C code and distribute these threads across the hardware and software domains to more fully utilize the asymmetric characteristics between processors and the embedded reconfigurable logic fabric. We show that Twill provides a sig- nificant performance increase on the CHStone benchmarks with an average 1.63 times increase over the pure hardware approach and an increase of 22.2 times on average over the pure software approach while reducing the area required by the reconfigurable logic by on average 1.73 times compared to the pure hardware approach.
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Smaling, Rudolf M. "System architecture selection in a multi-disciplinary system design optimization framework." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/91788.
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Kosaraju, Sai Sri. "StreamER: Evaluation Framework For Streaming Recommender Systems." Thesis, Malmö universitet, Fakulteten för teknik och samhälle (TS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20279.
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Recommender systems have gained a lot of popularity in recent times dueto their application in the wide range of fields. Recommender systems areintended to support users in finding the relevant items based on their interestsand preferences. Recommender algorithms proposed by researchersevolved over time from simple matching recommendations to machine learningalgorithms. One such class of algorithms with increasing focus is oncalled streaming recommender systems, these algorithms treat input data asa stream of events and make recommendations. To evaluate the algorithmsthat work with continuous data streams, stream-based evaluation techniquesare needed. So far, less interest is shown in the research so far on the evaluationof recommender systems in streaming environments.In this thesis, a simple evaluation framework named StreamER that evaluatesrecommender algorithms that work on streaming data is proposed.StreamER is intended for the rapid prototyping and evaluation of incrementalalgorithms. StreamER is designed and implemented using object-orientedarchitecture to make it more flexible and expandable. StreamER can beconfigured via a configuration file, which can configure algorithms, metricsand other properties individually. StreamER has inbuilt support for calculatingaccuracy metrics, namely click-through rate, precision, and recall.The popular-seller and random recommender are two algorithms supportedout of the box with StreamER. Evaluation of StreamER is performed via acombination of hypothesis and manual evaluation. Results have matched theproposed hypothesis, thereby successfully evaluating the proposed frameworkStreamER.
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Abdymomunov, Azamat. "Application of system safety framework in hybrid socio-technical environment of Eurasia." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/70794.
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Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 91-93).
The political transformation and transition of post-Soviet societies have led to hybrid structures in political, economic and technological domains. In such hybrid structures the roles of government, state enterprise, private business and civil society are not clearly defined. These roles shift depending on formal and informal interests, availability and competition for limited resources, direct and indirect financial benefits, internal and external agendas. In an abstract sense, a hybrid is "anything derived from heterogeneous sources, or composed of elements of different or incongruous kinds" (Hybrid). If transition is a process from one state to another, hybrid is a state unto itself. In the context of this thesis Hybrid Socio-Technical Environment means the co-existence of different institutions and policies, state and private business entities, old and new technologies, managerial models and practices of planning and market economies, collectivist and individualist value systems. Rapid technological progress, coupled with shifts in political and economic structures, may produce long-lasting disturbances in a society. Such disturbances are result of the hybrid society's contradictory nature. Some of these disturbances appear in the form of large-scale systemic accidents, such as the Sayano-Shushenskaya Hydroelectric Power Station accident. The rigid and outdated Soviet socio-technical system was broken down into multiple independent systems and subsystems to increase operational flexibility, with very limited capital investment. A twenty-year transition period (1990-2010), proved the survivability of the Soviet system, which was able to perform its primary functions even with partial capacity. However, recent large-scale accidents are clear signs that the system is stretching beyond its limits. Changes in the socio-technical landscape (multiple stakeholders and variety of interests) suggest that the traditional approaches of Reliability Theory, with its inward focus, may not be an effective tool in identifying emerging challenges. The outward-focused System theory approach takes into consideration key characteristics of the changing hybrid socio-technical landscape, as well as motivations of multiple stakeholders. The research concludes that insufficient capital investment and backlog in maintenance shifts are key systemic factors that allow migration of organizational behavior from a safe to an unsafe state. Additional analysis has to be conducted to prove this conclusion.
by Azamat Abdymomunov.
S.M.in Engineering and Management
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Lee, Jong Chul. "System-Level Observation Framework for Non-Intrusive Runtime Monitoring of Embedded Systems." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/338687.
Full textAbstract:
As system complexity continues to increase, the integration of software and hardware subsystems within system-on-a-chip (SOC) presents significant challenges in post-silicon validation, testing, and in-situ debugging across hardware and software layers. The deep integration of software and hardware components within SOCs often prevents the use of traditional analysis methods to observe and monitor the internal state of these components. This situation is further exacerbated for in-situ debugging and testing in which physical access to traditional debug and trace interfaces is unavailable, infeasible, or cost prohibitive. In this dissertation, we present a system-level observation framework (SOF) that provides minimally intrusive methods for dynamically monitoring and analyzing deeply integrated hardware and software components within embedded systems. The SOF monitors hardware and software events by inserting additional logic within hardware cores and by listening to processor trace ports. The SOF provides visibility for monitoring complex execution behavior of software applications without affecting the system execution. The SOF utilizes a dedicated event-streaming interface that allows efficient observation and analysis of rapidly occurring events at runtime. The event-streaming interface supports three alternatives: (1) an in-order priority-based event stream controller, (2) a round-robin priority-based event stream controller, and (3) a priority-level based event stream controller. The in-order priority-based event stream controller, which uses efficient pipelined hardware architecture, ensures that events are reported in-order based on the time of the event occurrence. While the in-order priority-based event stream controller provides high throughput for reporting events, significant area requirement can be incurred. The round-robin priority-based event stream controller is an area-efficient event stream ordering technique with acceptable tradeoffs in event stream throughput. To further reduce area requirement, the SOF supports a priority-level based event stream controller that provides an in-ordering method with smaller area requirements than the round-robin priority-based event stream controller. Comprehensive experimental results using a complete prototype system implementation are presented to quantify the tradeoffs in area, throughput, and latency for the various event streaming interfaces considering several execution scenarios.
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Pham, Quan. "Delegation framework for federated systems." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/48880/1/Quan_Pham_Thesis.pdf.
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It is not uncommon for enterprises today to be faced with the demand to integrate and incor- porate many different and possibly heterogeneous systems which are generally independently designed and developed, to allow seamless access. In effect, the integration of these systems results in one large whole system that must be able, at the same time, to maintain the local autonomy and to continue working as an independent entity. This problem has introduced a new distributed architecture called federated systems. The most challenging issue in federated systems is to find answers for the question of how to efficiently cooperate while preserving their autonomous characteristic, especially the security autonomy. This thesis intends to address this issue. The thesis reviews the evolution of the concept of federated systems and discusses the organisational characteristics as well as remaining security issues with the existing approaches. The thesis examines how delegation can be used as means to achieve better security, especially authorisation while maintaining autonomy for the participating member of the federation. A delegation taxonomy is proposed as one of the main contributions. The major contribution of this thesis is to study and design a mechanism to support dele- gation within and between multiple security domains with constraint management capability. A novel delegation framework is proposed including two modules: Delegation Constraint Man- agement module and Policy Management module. The first module is designed to effectively create, track and manage delegation constraints, especially for delegation processes which require re-delegation (indirect delegation). The first module employs two algorithms to trace the root authority of a delegation constraint chain and to prevent the potential conflict when creating a delegation constraint chain if necessary. The first module is designed for conflict prevention not conflict resolution. The second module is designed to support the first module via the policy comparison capability. The major function of this module is to provide the delegation framework the capability to compare policies and constraints (written under the format of a policy). The module is an extension of Lin et al.'s work on policy filtering and policy analysis. Throughout the thesis, some case studies are used as examples to illustrate the discussed concepts. These two modules are designed to capture one of the most important aspects of the delegation process: the relationships between the delegation transactions and the involved constraints, which are not very well addressed by the existing approaches. This contribution is significant because the relationships provide information to keep track and en- force the involved delegation constraints and, therefore, play a vital role in maintaining and enforcing security for transactions across multiple security domains.
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Butterworth, Richard J. "A formal framework for the specification of interactive systems." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/14163.
Full textAbstract:
We are primarily concerned with interactive systems whose behaviour is highly reliant on end user activity. A framework for describing and synthesising such systems is developed. This consists of a functional description of the capabilities of a system together with a means of expressing its desired 'usability'. Previous work in this area has concentrated on capturing 'usability properties' in discrete mathematical models. We propose notations for describing systems in a 'requirements' style and a 'specification' style. The requirements style is based on a simple temporal logic and the specification style is based on Lamport's Temporal Logic of Actions (TLA) [74]. System functionality is specified as a collection of 'reactions', the temporal composition of which define the behaviour of the system. By observing and analysing interactions it is possible to determine how 'well' a user performs a given task. We argue that a 'usable' system is one that encourages users to perform their tasks efficiently (i.e. to consistently perform their tasks well) hence a system in which users perform their tasks well in a consistent manner is likely to be a usable system. The use of a given functionality linked with different user interfaces then gives a means by which interfaces (and other aspects) can be compared and suggests how they might be harnessed to bias system use so as to encourage the desired user behaviour. Normalising across different users anq different tasks moves us away from the discrete nature of reactions and hence to comfortably describe the use of a system we employ probabilistic rather than discrete mathematics. We illustrate that framework with worked examples and propose an agenda for further work.