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Dissertations / Theses on the topic 'Critical distributed real-time systems'

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Published: 4 June 2021

Last updated: 17 February 2022

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1

Ehret, Jürgen. "Validation of safety critical distributed real-time systems." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969424884.

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2

Pop, Traian. "Scheduling and Optimisation of Heterogeneous Time/Event-Triggered Distributed Embedded Systems." Licentiate thesis, Linköping : Univ, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5691.

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3

Kanchanaharuthai, Adirak. "Small-Signal Stability, Transient Stability and Voltage Regulation Enhancement of Power Systems with Distributed Renewable Energy Resources." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1321988036.

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4

Wing, Leung Cheuk. "Archtecture of distributed real-time systems." Thesis, KTH, Programvaruteknik och Datorsystem, SCS, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-140209.

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CRAFTERS (Constraint and Application Driven Framework for Tailoring Embedded Real-time System) project aims to address the problem of uncertainty and heterogeneity in a distributed system by providing seamless, portable connectivity and middleware. This thesis contributes to the project by investigating the techniques that can be used in a distributed real-time embedded system. The conclusion is that, there is a list of specifications to be meet in order to provide a transparent and real-time distributed system. This thesis has implemented a basic system that provides support of scalability, a

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5

Huh, Eui-Nam. "Certification of real-time performance for dynamic, distributed real-time systems." Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1178732244.

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6

Brohede, Marcus. "Real-Time Database Support for Distributed Real-Time Simulations." Thesis, University of Skövde, Department of Computer Science, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-620.

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<p>Simulation is a good way to gain insight into a system, for example during development, without having to run or build the actual system. This is especially true for real-time systems, which often operate in hazardous environments or control critical entities in the 'real' world, making testing of these systems in their real environment unsafe during development.</p><p>When building simulations, one simulator is not likely to fit every type of simulation project. Therefore, different simulators, which focus on different aspects of simulation, are built. The High Level Architecture (HLA) fro

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7

Leifsson, Egir örn. "Recovery in Distributed Real-Time Database Systems." Thesis, University of Skövde, Department of Computer Science, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-395.

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<p>Recovery is a fundamental service in database systems. In this work, we present a new mechanism for diskless real-time recovery in fully replicated distributed real-time database systems. Traditionally, recovery has relied on disk-resident redundant data. Unfortunately, disks cannot always be used in real-time systems since these systems are sometimes used in environments which do not allow the use of disks. Also, minimizing the amount of hardware can save money, especially in mass-produced products. Instead of loading the database from disk, our recovery mechanism enables a restarted node

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8

Brohede, Marcus. "Component Decomposition of Distributed Real-Time Systems." Thesis, University of Skövde, Department of Computer Science, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-407.

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<p>Development of distributed real-time applications, in contrast to best effort applications, traditionally have been a slow process due to the lack of available standards, and the fact that no commercial off the shelf (COTS) distributed object computing (DOC) middleware supporting real-time requirements have been available to use, in order to speed up the development process without sacrificing any quality.</p><p>Standards and DOC middlewares are now emerging that are addressing key requirements of real-time systems, predictability and efficiency, and therefore, new possibilities such as com

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9

Hui, S. C. "Software development of real-time distributed systems." Thesis, University of Sussex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375841.

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10

Dellabani, Mahieddine. "Formal methods for distributed real-time systems." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAM090/document.

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Nowadays, real-time systems are ubiquitous in several application domains.Such an emergence led to an increasing need of performance (resources,availability, concurrency, etc.) and initiated a shift from theuse of single processor based hardware platforms, to large setsof interconnected and distributed computing nodes. This trend introduced the birthof a new family of systems that are intrinsically distributed, namelyemph{Networked Embedded Systems}.Such an evolution stems from the growing complexity of real-time softwareembedded on such platforms (e.g. electronic control in avionicsand automo

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11

Crellin, Kenneth Thomas. "Network time : synchronisation in real time distributed computing systems." Master's thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/17933.

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In the past, network clock synchronization has been sufficient for the needs of traditional distributed systems, for such purposes as maintaining Network File Systems, enabling Internet mail services and supporting other applications that require a degree of clock synchronization. Increasingly real time systems arc requiring high degrees of time synchronization. Where this is required, the common approach up until now has been to distribute the clock to each processor by means of hardware (e.g. GPS and cesium clocks) or to distribute time by means of an additional dedicated timing network. Whi

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12

Oztas, Gokhan. "Testing Distributed Real-time Systems With A Distributed Test Approach." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609492/index.pdf.

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Software testing is an important phase the of software development cycle which reveals faults and ensures correctness of the developed software. Distributed real-time systems are mostly safety critical systems for which the correctness and quality of the software is much more significant. However, majority of the current testing techniques have been developed for sequential (non real-time) software and there is a limited amount of research on testing distributed real-time systems. In this thesis, a proposed approach in the academic literature testing distributed real-time systems using a distr

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13

Lundin, Mats. "Building Distributed Control Systems Using Distributed Active Real-Time Databases." Thesis, University of Skövde, Department of Computer Science, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-234.

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<p>From the field of control theory, we can see that varying communication delays in a control system may be hard or even impossible to handle. From this point of view it is preferable to have these delays bounded and as small and as possible in order to adapt the control process to them. On the other hand, in some cases delays are inevitable and must be handled by the control system.</p><p>A control system may for different reasons be distributed, e.g., because of a distributed environment or severe environment demands such as heat or dust at some locations. Information in such a system will

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14

Balaguer, Sandie. "Study of concurrency in real-time distributed systems." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00821978.

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This thesis is concerned with the modeling and the analysis of distributedreal-time systems. In distributed systems, components evolve partlyindependently: concurrent actions may be performed in any order, withoutinfluencing each other and the state reached after these actions does notdepends on the order of execution. The time constraints in distributed real-timesystems create complex dependencies between the components and the events thatoccur. So far, distributed real-time systems have not been deeply studied, andin particular the distributed aspect of these systems is often left aside. Thi

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15

Almeida, Jose Carlos Alves de. "Software architecture for distributed real-time embedded systems." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA355809.

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Thesis (M.S. in Computer Science) Naval Postgraduate School, September 1998.<br>"September 1998." Thesis advisor(s): Man-Tak Shing, Michael Holden. Includes bibliographical references (p. 121-123). Also available online.

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16

Leuhusen, Joakim, and Andreas Karlsson. "Simulation and synchronization of distributed real-time systems." Thesis, Linköping University, Vehicular Systems, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-52784.

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<p>Today we are very much dependent on diﬀerent kinds of real time systems. Usually,a real time system is a system which is interacting with a physical environmentwith sensors or activators. There are many advantages by replacing mechanicalcomponents with electrical ones. For instance, it is usually cheaper and possibleto add new functions to the device without replacing the electronic part, whichwould have been necessary with a mechanical one.The possibility of simulating a distributed system is used throughout the vehi-cle industry. With the simulation of connected sub systems, using modeled

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17

Baba, Mohd Dani. "Fault tolerance in distributed real-time computer systems." Thesis, University of Sussex, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307238.

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A distributed real-time computer system consists of several processing nodes interconnected by communication channels. In a safety critical application, the real-time system should maintain timely and dependable services despite component failures or transient overloads due to changes in application environment. When a component fails or an overload occurs, the hard real-time tasks may miss their timing constraints, and it is desired that the system to degrade in a graceful, predictable manner. The approach adopted to the problem in this thesis is by integrating the resource scheduling with fa

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18

Bass, Julian M. "Voting in real-time distributed computer control systems." Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364312.

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19

Khan, Luqman F. "Real-Time Communication with TDMA on Distributed Systems." Thesis, California State University, Long Beach, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10978912.

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<p> A CrazyRadio is a 2.4GHZ usb bluetooth dongle and a Crazyflie is a programmable quadrotor used by researchers in the field of distributed computing. A Crazyflie is controlled remotely from a computer or a smartphone through a Crazyradio. However the communication protocol on the CrazyRadio can communicate only with one Crazyflie after pairing, therefore implementing a swarm requires many changes which are prone to failures. This thesis proposes a communication protocol for distributed and highly dynamic systems. The proposed protocol is a combination of two communication protocols: Slotted

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20

Pedreiras, Paulo Bacelar Reis. "Supporting flexible real-time communication on distributed systems." Doctoral thesis, Universidade de Aveiro, 2003. http://hdl.handle.net/10773/12977.

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Doutoramento em Engenharia Electrónica<br>Distributed computer-control systems (DCCS) are widely disseminated, appearing in applications ranging from automated process and manufacturing control to automotive, avionics and robotics. Many of these applications comprise real-time activities, that is, activities that must be performed within strict time bounds. Due to its distributed nature, these systems comprise multiple autonomous processing units that, despite being autonomous, need to exchange data in order to achieve control over the environment. For this reason the data exchange among diffe

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21

Gu, Dazhang. "Resource Management for Dynamic, Distributed Real-time Systems." Ohio University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1129251017.

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22

Ogle, David Mark. "Real-time monitoring of parallel and distributed systems /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487594970653034.

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23

Hoang, Hoai. "Enhancing the Performance of Distributed Real-time Systems." Doctoral thesis, Högskolan i Halmstad, Halmstad Embedded and Intelligent Systems Research (EIS), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1986.

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Advanced embedded systems can consist of many sensors, actuators and processors that are deployed on one or several boards, while having a demand of interacting with each other and sharing resources. Communication between different components usually has strict timing constraints. There is thus a strong need to provide solutions for time critical communication. This thesis focuses on both the support of real-time services over standard switched Ethernet networks and the improvement of systems' real-time characteristics, such as reducing delay and jitter in processors and on communication links

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24

Böke, Carsten. "Automatic configuration of real time operating systems and real time communication systems for distributed embedded applications." Paderborn : Heinz-Nixdorf-Inst, 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971712182.

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25

Thane, Henrik. "Monitoring, testing and debugging of distributed real-time systems." Doctoral thesis, KTH, Machine Design, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2984.

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26

Almohammad, Ali. "Rigorous code generation for distributed real-time embedded systems." Thesis, Northumbria University, 2013. http://nrl.northumbria.ac.uk/14825/.

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This thesis addresses the problem of generating executable code for distributed embedded systems in which computing nodes communicate using the Controller Area Network (CAN). CAN is the dominant network in automotive and factory control systems and is becoming increasingly popular in robotic, medical and avionics applications. The requirements for functional and temporal reliability in these domains are often stringent, and testing alone may not offer the required level of con dence that systems satisfy their specications. Consequently, there has been considerable research interest in addition

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27

Sandys, Sean David. "Requirement specifications for communication in distributed real-time systems /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/7002.

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28

Sánchez, César. "Deadlock avoidance for distributed real-time and embedded systems /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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29

Liu, Guangtian. "An event service architecture in distributed real-time systems /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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30

Segala, Roberto. "Modeling and verification of randomized distributed real-time systems." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36560.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.<br>Includes bibliographical references (p. 267-274) and index.<br>by Roberto Segala.<br>Ph.D.

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31

Marinucci, Toni. "Characterization and Development of Distributed, Adaptive Real-Time Systems." Ohio University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1113831763.

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32

Davies, Jim. "Specification and proof in real-time systems." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279830.

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33

Wilkinson, Richard Alexander. "Towards certifiable reconfigurable real-time mission critical software systems." Thesis, University of Newcastle Upon Tyne, 2009. http://hdl.handle.net/10443/1982.

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This thesis makes a contribution towards the certification of reconfigurable real-time mission critical software systems. In highly reconfigurable software systems it is possible for a situation to arise where the system expends most or all of its resources on reconfiguring, and thus cannot provide sufficient resources to conduct intended computing functions. This anomaly has been termed "configuration thrashing" by the author due to its loose analogy to memory thrashing. If configuration thrashing is not eliminated, or at least minimised, then it is possible for circumstance to occur where re

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34

Veloudis, Simeon. "A formal approach to modelling real-time critical systems." Thesis, University of Reading, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417354.

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35

Sigurðsson, Páll Axel. "Predictable Multiprocessor Platform for Safety- Critical Real- Time Systems." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302139.

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Multicore systems excel at providing concurrent execution of applications, giving true parallelism where all cores can execute sequences of machine instructions at the same time. However, multicore systems come with their own sets of problems, most notably when cores in a system (or core tiles) share hardware components such as memory modules or Input/Output (IO) peripherals. This increased level of complexity makes it especially difficult to design and verify safety- critical systems that require real- time operation, such as flight controllers in airplanes and airbag controllers in the autom

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36

Chen, Deji. "Real-time data management in the distributed environment /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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37

Grimm, Henrik. "Distributed database support for networked real-time multiplayer games." Thesis, University of Skövde, Department of Computer Science, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-734.

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<p>The focus of this dissertation is on large-scale and long-running networked real-time multiplayer games. In this type of games, each player controls one or many entities, which interact in a shared virtual environment. Three attributes - scalability, security, and fault tolerance - are considered essential for this type of games. The normal approaches for building this type of games, using a client/server or peer-to-peer architecture, fail in achieving all three attributes. We propose a server-network architecture that supports these attributes. In this architecture, a cluster of servers co

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38

Chatain, Thomas. "Concurrency in Real-Time Distributed Systems, from Unfoldings to Implementability." Habilitation à diriger des recherches, École normale supérieure de Cachan - ENS Cachan, 2013. http://tel.archives-ouvertes.fr/tel-00926306.

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Formal methods offer a way to deal with the complexity of information systems. They are adapted to a variety of domains like design, verification, model-checking, test and supervision. But information systems are also more and more often distributed, first because of the generalization of information networks, but also because inside a single device, like a computer, the numerous components run concurrently. The problem is that concurrency is known to be a major difficulty for the use of formal methods because it causes a combinatorial explosion of the state space of the systems. This difficul

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39

Gubba, Ravikumar Krishnanjan. "Distributed simulation of power systems using real time digital simulator." Master's thesis, Mississippi State : Mississippi State University, 2009. http://library.msstate.edu/etd/show.asp?etd=etd-06152009-222641.

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40

Al-Rashoud, B. S. A. "A truly distributed database architecture for hard real-time systems." Thesis, Swansea University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.635710.

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In any system, good management depends on access to good information. In real-time systems, however, it is not enough to have access to correct data; that data should also be referenced to time. In distributed systems the validity of data is affected by many factors. Besides the errors that can occur because of hardware or software failures, inconsistency can occur through other factors such as uncontrolled access to distributed data, or because of uncompleted access to duplicated data. Many factors contribute to the incorrectness of data in the domains of value and time. This thesis sets out

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41

Zhao, G. F. "A real-time messaging system for distributed computer control systems." Thesis, Swansea University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636733.

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The OSI-based data communication standards, and particularly the MAP-selected profile, have provided a genuine, vendor-independent communication environment, crucial to multiple computer-based control applications. One of the vital components in the Application Layer of these standards, aimed directly at supporting communications between programmable devices in manufacturing environments, is the 'Manufacturing Message Specification' (MMS). Although MMS has been acknowledged as vitally important in standardizing communications between shop-floor devices, and despite having been developed specif

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42

Liu, Meng. "On Improving Resource Utilization in Distributed Real-Time Embedded Systems." Licentiate thesis, Mälardalens högskola, Inbyggda system, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-26519.

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In our modern life, embedded systems are playing an essential role. An embedded system is a computer system embedded into a certain device, in order to achieve computing functions. Beyond all doubt, as a validated system, the functional correctness must be guaranteed. However, for many embedded systems, timeliness also plays an important role in addition to the correctness of the functionalities. For example, in an automotive braking system, the braking function needs to be processed within a limited time duration in order to avoid accidents. Such systems are known as real-time embedded system

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43

Lima, George Marconi de ArauÌjo. "Fault tolerance in fixed-priority hard real-time distributed systems." Thesis, University of York, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400278.

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44

Pedro, Paulo Sergio Martins. "Schedulability of mode changes in flexible real-time distributed systems." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310982.

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45

Chou, Pai Hsiang. "Control composition and synthesis of distributed real-time embedded systems /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/6895.

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46

Han, Kai. "Scheduling Distributed Real-Time Tasks in Unreliable and Untrustworthy Systems." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/26917.

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In this dissertation, we consider scheduling distributed soft real-time tasks in unreliable (e.g., those with arbitrary node and network failures) and untrustworthy systems (e.g., those with Byzantine node behaviors). We present a distributed real-time scheduling algorithm called Gamma. Gamma considers a distributed (i.e., multi-node) task model where tasks are subject to Time/Utility Function (or TUF) end-to-end time constraints, and the scheduling optimality criterion of maximizing the total accrued utility. The algorithm makes three novel contributions. First, Gamma uses gossip for reliably

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47

Liang, Ming. "Monitoring and Analyzing Communication Latency in Distributed Real-time Systems." Ohio University / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1061240294.

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48

Hill, Martin R. "The design of robust protocols for distributed real-time systems." Thesis, Aston University, 1990. http://publications.aston.ac.uk/8077/.

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Modern distributed control systems comprise of a set of processors which are interconnected using a suitable communication network. For use in real-time control environments, such systems must be deterministic and generate specified responses within critical timing constraints. Also, they should be sufficiently robust to survive predictable events such as communication or processor faults. This thesis considers the problem of coordinating and synchronizing a distributed real-time control system under normal and abnormal conditions. Distributed control systems need to periodically coordinate th

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49

Mathiason, Gunnar. "Segmentation in a Distributed Real-Time Main-Memory Database." Thesis, University of Skövde, Department of Computer Science, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-737.

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<p>To achieve better scalability, a fully replicated, distributed, main-memory database is divided into subparts, called segments. Segments may have individual degrees of redundancy and other properties that can be used for replication control. Segmentation is examined for the opportunity of decreasing replication effort, lower memory requirements and decrease node recovery times. Typical usage scenarios are distributed databases with many nodes where only a small number of the nodes share information. We present a framework for virtual full replication that implements segments with scheduled

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Nicholson, Mark. "Selecting a topology for safety-critical real-time control systems." Thesis, University of York, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263664.

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