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International Conference on Networked Sensing systems

作者： Hayek, Ali Schreiber, Michael Borcsok, Josef Computer Architecture and System Programming University of Kassel 34121 Kassel Germany

ISBN: (纸本)9781424479108

The development of embedded sensing applications based on integrated circuits leads to ever-growing complexity of VHDL-code and requires sophisticated testability to achieve high diagnostic coverage. The norm IEC 61508 provides a set of requirements for the implementation of safety-related software. This paper deals with the testing of VHDL modules according to IEC 61508. Since VHDL is a hardware description language and differs from traditional software languages, new testing aspects and common coverage criteria are examined with respect to basic needs resulting from those differences. Therefore, a development process according to the V-Model is introduced and a classification of VHDL modules is proposed, providing a basis on which several testing methods and exit-criteria can be evaluated with respect to specific design attributes common for each class. © 2010 IEEE.

关键词： computer hardware description languages

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Influences of attacks on safety related systems

Influences of attacks on safety related systems

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23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010

作者： Börcsök, J. Ugljesa, E. Dept. of Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9784883254194

Several standards and guidelines give advice on the development of qualitative and quantitative criteria to evaluate safety related systems, in order to apply these in safety critical applications. These standards don't take into account the possibility of an external attack on the safety related system. In this paper, we will describe the current situation and explore methods and models for security and safety related systems with the help of Markov-models.

关键词： Markov processes

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A filtered tuning method for a GPC controller

A filtered tuning method for a GPC controller

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IET Irish Signals and systems Conference, ISSC 2010

作者： Schwarz, M.H. Cox, C.S. Börcsök, J. Department of Computer Architecture and System Programming Safety Computer Technology University of Kassel Kassel Germany Control Systems Centre University of Sunderland Sunderland United Kingdom Department of Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9781849192521

This paper presents a new tuning method based on model parameters identified in closed-loop. For classical controllers such as PI(D) controllers a large number of simple tuning methods for various application areas exist. However, when it comes to designing a generalised predictive controller (GPC) four parameters have to be specified. To choose those parameters is not a trivial task since they are not directly related to control or regulation performance. The presented tuning method exploits model-parameters to select suitable controller parameters. Additionally, a Rhinehart filter is incorporated in the design to decrease the impact of noise, therefore, a fifth parameter has to be optimised. The proposed method has been tested in simulation and on a real system.

关键词： Controllers

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Different aspects to be considered for safety related development

Different aspects to be considered for safety related develo...

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23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010

作者： Schwarz, M.H. Börcsök, J. Dept. Computer Architecture and System Programming University of Kassel Germany Safety Computer Technology University of Kassel Germany

ISBN: (纸本)9784883254194

This paper presents the recent design and development aspects considered within a current project running at the department of computer architecture and system programming. The project "Safety WLAN architectures for safety critical applications related to diagnostic and predictive maintenance possibilities" includes the aspects of diagnostic and predictive maintenance strategies as well as safety related hardware, reliable software design and reliable wireless communication. This paper considers design strategies for the development of reliable, safe sensor systems for process control.

关键词： Software design

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A lock-free cache-friendly software queue buffer for decoupled software pipelining

A lock-free cache-friendly software queue buffer for decoupl...

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2010 International computer Symposium, ICS 2010

作者： Chen, Wen Ren Yang, Wuu Hsu, Wei Chung Programming Language and System Lab Institute of Computer Science and Engineering National Chiao Tung University Hsinchu 30013 Taiwan System Lab. Institute of Computer Science and Engineering National Chiao Tung University Hsinchu 30013 Taiwan

ISBN: (纸本)9781424476404

Multicore has become a trend on server and client computers in recent years. Parallelization is one way to fully utilize the computing power provided by multicore architectures. Most applications of interest have complex data and control dependency, which make traditional parallelization techniques, such as DOALL and DOACROSS, inapplicable. Decoupled Software Pipelining (DSWP), a new parallelization technique, shows its potential on parallelizing general applications. However, its success relies on fast inter-core synchronization and communication. On commodity multicore platforms, the performance of current DSWP disappoints us since the overhead involving lock-based, cache dishonored software approach offsets the benefit from DSWP. We present a lock-free, cache-friendly software queue designed for DSWP. A lock-free, cache-friendly solution need take two different aspects of memory system, memory coherence and memory consistency, into *** show how inattention to these two aspects leads to incorrect or inefficient solutions. We also present our approach to providing a correct and efficient solution with detailed explanation. Due to the nondeterministic nature of parallel programs, traditional testing techniques cannot be used to fully verify the correctness of the implementation. We also discuss the correctness of our implementation both in informal and formal ways. ©2010 IEEE.

关键词： Locks (fasteners)

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A filtered tuning method for a GPC controller

A filtered tuning method for a GPC controller

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IET Irish Signals and systems Conference (ISSC 2010)

作者： M.H. Schwarz C.S. Cox J. Börcsök Department of Computer architecture and System programming Safety Computer Technology University of Kassel Germany Control Systems Centre University of Sunderland UK Department of Computer architecture and System programming University of Kassel Germany

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PARBLO:Page-Allocation-Based DRAM Row Buffer Locality Optimization

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Journal of computer Science & Technology 2009年第6期24卷 1086-1097页

作者：米伟冯晓兵贾耀仓陈莉薛京灵 Key Laboratory of Computer System and Architecture Institution of Computing Technology Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Programming Languages and Compilers Group School of Computer Science and Engineering University of New South Wales

DRAM row buffer conflicts can increase memory access latency significantly. This paper presents a new pageallocation-based optimization that works seamlessly together with some existing hardware and software optimizations to eliminate significantly more row buffer conflicts. Validation in simulation using a set of selected scientific and engineering benchmarks against a few representative memory controller optimizations shows that our method can reduce row buffer miss rates by up to 76% （with an average of 37.4%）. This reduction in row buffer miss rates will be translated into performance speedups by up to 15% （with an average of 5%）.

关键词： DRAM row buffer page allocation locality optimization

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Analysis of community structure in Wikipedia (poster) 09

Analysis of community structure in Wikipedia (poster)

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18th International World Wide Web Conference, WWW 2009

作者： Lizorkin, Dmitry Medelyan, Olena Grineva, Maria Inst. for System Programming Russian Academy of Sciences Russia Computer Science Dept. Univ. of Waikato New Zealand

ISBN: (纸本)9781605584874

We present the results of a community detection analysis of the Wikipedia graph. Distinct communities in Wikipedia contain semantically closely related articles. The central topic of a community can be identified using PageRank. Extracted communities can be organized hierarchically similar to manually created Wikipedia category structure. Copyright is held by the author/owner(s).

关键词： Population dynamics

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Advanced PFH calculations for safety integrity systems with high diagnostic

Advanced PFH calculations for safety integrity systems with ...

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XXII International Symposium on Information, Communication and Automation Technologies, ICAT

作者： P. Holub J. Börcsök Computer Architecture and System Programming University of Kassel Kassel Germany

The calculation of "Probability of Failure on Demand" (PFH) according to IEC 61508 shows for a 1oo1 and a 1oo2 system using the same initial values that - as expected - a 1oo2 system is a better safety integrity system than a 1oo1 system. This means, that a 1oo2 system has a lower probability of failure than a 1oo1 system. Comparing the same systems operating in a high demand or continuous mode of operation, there will be some cases, especially for systems with high diagnostics, where a 1oo1 system has a lower ¿Probability of Failure per Hour¿ (PFH) value than a 1oo2 system, using the PFH formulas according to IEC 61508. Using the equation according to IEC 61508, it is also possible that the PFH value is apparently better the longer the system runs either in the high mode or continuous mode of operation. Both results are irreproducible in industrial reality. Therefore, this paper will analyze first what conditions are necessary to get a hazard event when using a PFH system. Only those cases are considered in the modified PFH calculation, in which indeed a hazard event occurs. In a second step, it presents a new approach with the help of plausible arguments in order to calculate the PFH value of a PFH system considering a high diagnostic and a very low failure rate. The presented approach can also be correctly verified with mathematics using the advanced Markov model also described in this paper.

关键词： IEC standards Phase frequency detector Hazards Protection computer architecture Humans Safety devices Robotic assembly Risk analysis Probability

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Matlab / Simulink generated source code for safety related systems

Matlab / Simulink generated source code for safety related s...

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s6th IEEE/ACS International Conference on computer systems and Applications, AICCSA 2008

作者： Schwarz, M.H. Sheng, H. Sheleh, A. Boercsoek, J. University of Kassel Department of Computer Architecture and System Programming Kassel Germany HIMA Paul Hildebrandt GmbH+Co. KG Bruehl Germany

ISBN: (纸本)9781424419685

The authors present their latest research results and developments of a code generator for Matlab / Simulink block diagrams and to download the generated code onto safety related systems such as a safety PLC (Programmable Logic Controller). An example demonstrates the different stages for code generation, evaluation and conversion before such code can be used in process industries. systematic approaches are necessary when such source code is embedded in process units. To the best knowledge of the authors, Matlab/Simulink source code has not been transferred on safety PLC before. Matlab / Simulink is an advanced and matured programming environment, especially for simulations of engineering processes and systems. Hardly no hardware exists, when it comes to download the developed algorithms and to use it in real world applications and so far this approach is the only one for using developed and tested Matlab / Simulink software on an safety related system. © 2008 IEEE.

关键词： Simulink

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