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检索条件"机构=Institute of Computer Architecture and System Programming University of Kassel"

共 153 条记录，以下是11-20 订阅

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

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

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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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FPGA-based wireless sensor network platform for safety systems

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

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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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Safe wireless communication for safety related systems with bluetooth technology

Safe wireless communication for safety related systems with ...

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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： 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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Approach to predict the software reliability with different methods

Approach to predict the software reliability with different ...

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7th International Conference on Electrical and Electronics Engineering, ELECO 2011

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

ISBN: (纸本)9786050102048

This particular essay expounds upon how one can foresee and predict software reliability. There are two major components that exist within a computer system: hardware and software. The reliabilities between the two are comparable because both are stochastic processes, which can be described by probability distributions. With this said, software reliability is the probability that will function without failure in a given software and in a given environment during a specified period of time. Thus, this is why software reliability is a major and key factor in software developmental processes and quality. However, one can spot the difference between software reliability and hardware reliability where it concerns the quality duration and the fact that software reliability does not decrease its reliability over time. © 2011 Chamber of Turkish Electric.

关键词： Software reliability

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Software development for safety-related systems

Software development for safety-related systems

引用

2nd International Conference on systems, ICONS 2007

作者： Börcsök, Josef Schaefer, Sebastian Department of Computer Architecture and System Programming University of Kassel

ISBN: (纸本)0769528074

Safety-related systems mostly comprise hardware and software solutions. Due to the increasing application of complex hardware and software systems, the software systems have to be considered regarding safety as well as hardware systems. The development of a safety-related software system is similar to the development of a safety-related hardware systems. But there are still no generally accepted methods for developing safety-critical software. One has to use the methods, which fit best to the actual requirements. However, the calculation of reliability and availability for safety-related software systems is far more complex. © 2007 IEEE.

关键词： Safety engineering

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Estimation of optimal safety parameters for a communication channel with required SIL 3 at runtime 29

Estimation of optimal safety parameters for a communication ...

引用

29th European Safety and Reliability Conference, ESREL 2019

作者： Gaus, Larissa Schwarz, Michael Börcsök, Josef Computer Architecture and System Programming University of Kassel Germany

ISBN: (纸本)9789811127243

In this paper, the optimization of safety parameters for a communication channel with the required safety integrity level (SIL) 3 at runtime is investigated. In order to guarantee the safe communication additional measures are needed. One of them is the black channel principle. It allows the transfer of safety related packets over the safety layer parallel to safety irrelevant data. Another method is the protection by a linear code, typically by cyclic redundancy check (CRC). In terms of the safety level, the information channel can be assumed as a generalized erasure channel (GEC) with the set of output symbols (0, e, 1). For this channel a formula for probability of failure per hour (PFH) can be derived using the parameters: bit error ratio, bit loss rate, message rate, code block length and weight spectrum. Within the safety layer, the communication occurs in the send-/receive-response principle (cyclic mode) and the messages can have a length defined by bounds on nmin and nmax. Accordingly, the optimization problem is formulated to minimize the PFH value by optimizing the message length for changing parameter values. © 2019 European Safety and Reliability Association. Published by Research Publishing, Singapore.

关键词： Bit error rate

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SILCaS - A new approach to calculate safety loops

SILCaS - A new approach to calculate safety loops

引用

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...

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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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