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检索条件"机构=Computer Architecture and System Programming"

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FPGA-based wireless sensor network platform for safety systems

FPGA-based wireless sensor network platform for safety syste...

引用

2012 19th International Conference on Telecommunications, ICT 2012

作者： Hayek, Ali Machmur, Bashier Suna, Yusuf Börcsök, Josef Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9781467307475

Sensor communication applications not only require high performance processing but also flexible and reliable computing. Today, standard microprocessor systems are still application oriented and aren't suitable by implication for reliability-related and safety-related applications. In order to achieve a certain safety integrity level (SIL), several measures, methodologies and especially additional components should be considered, which leads to more and more complex systems. For this reason, new application devices should be targeted. In this context, reconfigurable devices such as SRAM-based Field Programmable Gates Arrays (FPGAs) provide a suitable solution due to their flexibility, and the necessary computing performance at affordable design cost and time. In fact, SRAM-Based FPGAs are nowadays frequently used in embedded communication systems due to their design flexibility and reconfigurability. This paper presents a prototyping platform for an FPGA-based safety-related communication system for a wireless sensor network. As a case study an acceleration sensor application is introduced. © 2012 IEEE.

关键词： Wireless sensor networks

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The probability distribution of failure rates and diagnostic coverage factors

The probability distribution of failure rates and diagnostic...

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

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

ISBN: (纸本)9784883254194

In chapter 2 the authors firstly give a short outline of Bayesian inference, Bayesian prior and posterior distributions and Bayesian estimators. In chapter 3 they investigate random variables following a Poisson distribution. They then handle the rate parameter as a random variable, and show that the associated posterior distribution is an Erlang distribution. They then calculate the density functions of two ratios related to rate parameters. In chapter 4 the authors are dealing with partial stroke tests, proof tests, failure rates, and diagnostic coverage factors, determine the respective probability density functions and calculate confidence intervals. Finally they discuss the question whether or not to take account of the last failure of a test interval.

关键词： Poisson distribution

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Approach to the development of an FPGA-based safety-related, complete communication computer system 10

Approach to the development of an FPGA-based safety-related,...

引用

10th International Symposium on Telecommunications, BIHTEL 2014

作者： Gracic, Emil Hayek, Ali Borcsok, Josef Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9781479941360

This paper describes the implementation and integration process of a complete communication computer system on the field programmable gate array (FPGA). After such a design is reached, safety measures are integrated to achieve a safety-related architecture. For this purpose a diagnostic unit will be implemented, consisting of hardware and software tests. Hardware tests are related to the control of the FPGA functionality. They are based on the integration of two existing methods to reach complete hardware test coverage. The software tests are used for a continuous testing of the whole system (this means testing the central processing unit, bus systems, peripherals and memory). Furthermore, a safety multiplexer is integrated with the task to turn off the current operating system (main system) and to turn on a redundant system when a failure is introduced via the diagnostic unit. The safety multiplexer has to give the permission to the redundant system to receive the outputs from the main system in a way that is free from faults. The microcontroller ColdFire is used as a basis, which provides numerous features for the control of various peripherals as well as the connection of various types of memory. © 2014 IEEE.

关键词： Program processors

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Safe wireless communication for safety related systems with bluetooth technology

Safe wireless communication for safety related systems with ...

引用

11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012, PSAM11 ESREL 2012

作者： Pendli, Pavan Kumar Schwarz, Michael Wacker, Hans-Dieter Boercsoek, Josef Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9781622764365

This paper deals with achieving safe wireless communication for safety related systems with Bluetooth technology. In industries at present safe communication between the field bus/devices, PLC/controllers, and system/applications (SCADA, DCS and MES systems) is achieved using safe wired industrial communication protocols such as safe field buses or safe Ethernet. To achieve safe communication, there are certain safety methods, these methods are discussed in the European standard document EN 50159-2. Wired industrial communication protocols implement these methods to achieve safe communication. To determine safety, mathematical equations are derived, which are suitable for wired communication, and which takes into account only the bit errors present in the transmission channel. As there are both bit errors and erasures (loss of information) present in the wireless channel, the mathematical equations derived for wired communication should also take into account erasure of information for wireless communication. This paper derives the mathematical equations for wireless communication to determine the safety and with the implemented safety methods for Bluetooth technology;safety integrity level SIL3 achieved is shown.

关键词： Bluetooth

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New algorithm to predict the residual number of critical software failure which based on imperfect debugging

New algorithm to predict the residual number of critical sof...

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11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012, PSAM11 ESREL 2012

作者： Krini, Ossmane Börcsök, Josef Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9781622764365

This scientific work presents a new method allowing to make a realistic prediction about software-reliability of critical systems. The main feature of this method enables the prediction of an estimate of the remaining critical number of faults in the software. The algorithm uses already known methods such as Imperfect Debugging. This method can provide an even more reliable prognosis than the conventional methods. Furthermore, the new method describes two processes for critical failures (detection and correction process). The new algorithm considers a time, which is called repair-time. This time is important for the reliably prognosis and it is mathematically described as a time-function and used in the prediction model. The software reliability models (SRM's) are used since the 70's, these software reliability models are based on stochastic and aiming to predict the reliability for the software and also for the hardware. SRM's are based on model assumptions, some of which cannot be applied anymore. Thus, for the reliability engineering today, these models are insufficient.

关键词： Software reliability

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New approach to determine the critical number of failure in software systems

New approach to determine the critical number of failure in ...

引用

2011 23rd International Symposium on Information, Communication and Automation Technologies, ICAT 2011

作者： Krini, Ossmane Börcsök, Josef Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9781457707469

Software-Engineering is very important today. In industry (specifically by software critical system) it is important to produce high reliable software, i.e. software with low proportion of faults. To produce such reliable software, a long handling process is required, and because this process consumes a large amount of time and resources to achieve the desired reliability goals it is useful to use Software Reliability Stochastic Models to predict the required software testing time. In this paper a new approach to reflecting the residual number of critical failures in software-systems is introduced. There are currently very few processes enabling us to predict the reliability of the critical failures or the critical failure rate for critical systems. Furthermore, we will focus on distinguishing the critical failures in the software. We will thus distinguish both critical as well as non-critical failures in the Software. Therefore it is important to divide the process into two classes, detection- and correction class. To develop an approach it is necessary to determine corresponding distribution functions and model assumptions. © 2011 IEEE.

关键词： Software reliability

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Calculation of safety parameters

Calculation of safety parameters

引用

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

作者： Börcsök, J. Department of Computer Architecture and System Programming University of Kassel Germany

ISBN: (纸本)9784883254194

The standard IEC/EN 61508 defines the requirements for safety systems to be applied to industrial plant safety independently of the application. It is not only intended as a basis for the development of future application orientated standards, but also as a basis of all safety related electrical, electronic and programmable electronic systems, in order to apply it to safety critical applications. The purpose of this paper is to describe the SILCas tool which enables the user to determine the Safety Integrity Level (SIL) and the probability of failure on demand (PFD) for entire SIFs (consisting of sensor, signal processing, actuator) and for different system architectures.

关键词： Accident prevention

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SILCaS - A new approach to calculate safety loops

SILCaS - A new approach to calculate safety loops

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11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012, PSAM11 ESREL 2012

作者： Boercsoek, J. Computer Architecture and System Programming University of Kassel 34121 Kassel Germany

ISBN: (纸本)9781622764365

In Functional Safety it is necessary to calculate safety parameters in order to determine the safety integrity level as well as to determine PFD and MTTF values. Nowadays, several international valid safety standards exist for different user and application areas. In every standard different methods and procedures occur to calculate relevant safety parameters and to determine the failure rates of the components. Those are often only partially comparable. Today, different tools exist to calculate safety loops. However, the models to calculate the parameters are often unknown to the user and therefore it is difficult to state the quality of the solution. This paper discusses these problems and presents a tool, which calculates according the IEC 61508 Ed. 2 standard. This tool is developed in cooperation with a database established by TUV Rheinland, and will give users an advantage in calculating appropriate and reliable parameters.

关键词： Failure rate

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A partially automated HiL test environment for model-based development using Simulink® and OPC technology

A partially automated HiL test environment for model-based d...

引用

2011 23rd International Symposium on Information, Communication and Automation Technologies, ICAT 2011

作者： Chaaban, W. Schwarz, M. Batchuluun, B. Sheng, H. Börcsök, J. Department of Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9781457707469

This paper is concerned with the design procedures of an automated testing tool, developed in Matlab®/Simulink® environment, that performs software verification during runtime on a PLC (Programmable Logic Controller) or so called HiL test (Hardware-in-the-Loop) for model-based development of control applications. In addition to checking the "semantic" or "functional" correctness of the automatically generated C++ - Code with RTW (Real Time Workshop®) for algorithms designed and developed in Simulink® on hardware targets, the tool compares results obtained from the HiL test with the results of the MiL test (Model-in-the-Loop) performed in early stage of development for the same developed application. The main purpose behind this work is to develop reliable software that fulfil system requirements and to test its behaviour during realtime hardware simulation, in order to achieve the validation step which represents the terminating - step of almost all projects. © 2011 IEEE.

关键词： Simulink

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Basic VHDL tests conforming to IEC 61508

Basic VHDL tests conforming to IEC 61508

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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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