Статті в журналах з теми "Operating system dependability"
Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Operating system dependability.
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 статей у журналах для дослідження на тему "Operating system dependability".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте статті в журналах для різних дисциплін та оформлюйте правильно вашу бібліографію.
1
Rotshtein, A. Р. "Fuzzy cognitive maps in the dependability analysis of systems." Dependability 19, no. 4 (December 17, 2019): 24–31. http://dx.doi.org/10.21683/1729-2646-2019-19-4-24-31.
Повний текст джерелаАнотація:
Aim. Dependability simulation of a complex system starts with its structuring, i.e. partitioning into components (blocks, units, elements), for which probabilities of failure are known. The classical dependability theory uses the concept of structural function that allows ranking elements by their importance, which is required for optimal distribution of the resources allocated to ensuring system dependability. Man-machine systems are structured using an algorithmic description of discrete processes of operation, where the presence of clear boundaries between individual operations allows collecting statistical data on the probabilities of error that is required for modeling. Algorithmization is complicated in case of man-machine systems with continuous human activity, where the absence of clear boundaries between operations prevents the correct assessment of the probability of their correct performance. For that reason, the process of operation has to be considered as a single operation, whose correct performance depends on heterogeneous and interconnected human-machine system-related, technical, software-specific, managerial and other factors. The simulated system becomes a “black box” with unknown structure (output is dependability, inputs are contributing factors), while the problem of element ranking typical to the dependability theory comes down to the problem of factor ranking. Regression analysis is one of the most popular means of multifactor dependability simulation of man-machine systems. It requires a large quantity of experimental data and is not compatible with qualitative factors that are measured by expert methods. The “if – then” fuzzy rule is a convenient tool for expert information processing. However, regression analysis and fuzzy rules have a common limitation: they require independent input variables, i.e. contributing factors. Fuzzy cognitive maps do not have this restriction. They are a new simulation tool that is not yet widely used in the dependability theory. The Aim of the paper is to raise awareness of dependability simulation with fuzzy cognitive maps.Method. It is proposed – based on the theory of fuzzy cognitive maps – to rank factors that affect system dependability. The method is based on the formalization of causal relationships between the contributing factors and the dependability in the form of a fuzzy cognitive map, i.e. directed graph, whose node correspond to the system’s dependability and contributing factors, while the weighted edges indicate the magnitude of the factors’ effect on each other and the system’s dependability. The rank of a factor is defined as an equivalent of the element’s importance index per Birnbaum, which, in the probabilistic dependability theory is calculated based on the structure function.Results. Models and algorithms are proposed for calculation of the importance indexes of single factors and respective effects that affect system dependability represented with a fuzzy cognitive map. The method is exemplified by the dependability and safety of an automobile in the “driver-automobile-road” system subject to the driver’s qualification, traffic situation, unit costs of operation, operating conditions, maintenance scheduling, quality of maintenance and repair, quality of automobile design, quality of operational materials and spare parts, as well as storage conditions.Conclusions. The advantages of the method include: a) use of available expert information with no collection and processing statistical data; b) capability to take into account any quantitative and qualitative factors associated with people, technology, software, quality of service, operating conditions, etc.; c) ease of expansion of the number of considered factors through the introduction of additional nodes and edges of the cognitive map graph. The method can be applied to complex systems with fuzzy structures, whose dependability strongly depends on interrelated factors that are measured by means of expert methods.
2
Egorov, I. V. "Simulation model of dependability of redundant computer systems with recurrent information recovery." Dependability 18, no. 3 (September 5, 2018): 10–17. http://dx.doi.org/10.21683/1729-2646-2018-18-3-10-17.
Повний текст джерелаАнотація:
Today’s digital nanotechnology-based information management systems are especially sensitive to highly-energized particles during operation in irradiated areas. This sensitivity is most often manifested in the form of intermittent soft errors, i.e. distortion of information bits in the system’s memory elements with no hardware failure. The cause is in the afterpulses at the output of the logical elements that occur as the result of ionization of the gate area of the transistor’s semiconductor after it is exposed to a highly-energized particle. In order to counter soft errors the system is equipped with self-repair mechanisms that ensure regular replacement of distorted data with correct data. If this approach to design is employed, the significance of dependability analysis of the system under development increases significantly. Since regular occurrence of soft errors is essentially normal operating mode of a system in conditions of increased radiation, dependability analysis must be repeatedly conducted at the design stage, as that is the only way to duly evaluate the quality of the taken design decisions. The distinctive feature of fault-tolerant hardware and software systems that consists in the presence of nonprobabilistic recovery process limits the applicability of the known methods of dependability analysis. It is difficult to formalize the behaviour of such systems in the form of a dependability model in the context of the classic dependability theory that is geared towards the evaluation of hardware structure. As it has been found out, the application of conventional methods of dependability analysis (such as the Markovian model or probabilistic logic) requires making a number of assumptions that result in unacceptable errors in the evaluation results or its inapplicability.Aim. Development of the model and methods of dependability analysis that would allow evaluating the dependability of hardware and software systems with periodic recovery.Results. A simulation model was developed that is intended for dependability evaluation of complex recoverable information management systems. The model is a network of oriented state graphs that allows describing the behaviour of a recoverable system subject to the presence of computation processes and recovery processes that operate according to non-stochastic algorithms. Based on the simulation model, a software tool for dependability analysis was developed that enables probabilistic estimation of dependability characteristics of individual system units and its overall structure by means of computer simulation of failures and recoveries. This tool can be used for comprehensive dependability evaluation of hardware and software systems that involves the analysis of recoverable units with complex behaviour using the developed simulation model, and their operation along with simple hardware components, such as power supplies and fuses, using conventional analytical methods of dependability analysis. Such approach to dependability evaluation is implemented in the Digitek Reliability Analyzer dependability analysis software environment.Practical significance.The application of the developed simulation model and dependability analysis tool at the design stage enables due evaluation of the quality of the produced fault tolerant recoverable system in terms of dependability and choose the best architectural solution, which has a high practical significance.
3
Wang, Chao, and Zhongchuan Fu. "Quantitative evaluation of fault propagation in a commercial cloud system." International Journal of Distributed Sensor Networks 16, no. 3 (March 2020): 155014772090361. http://dx.doi.org/10.1177/1550147720903613.
Повний текст джерелаАнотація:
As semiconductor technology scales into the nano regime, hardware faults have been threats against computational devices. Cloud systems are incorporating more and more computing density and energy into themselves; thus, fundamental research on topics such as dependability validation is needed, in order to verify the robustness of clouds for sensor networks. However, dependability evaluation studies have often been carried out beyond isolated physical systems, such as processors, sensors, and single boards with or without operating system hosts. These studies have been performed using inaccurate simulations instead of validating complete cloud software stacks (firmware, hypervisor, operating system hosts and workloads) as a whole. In this article, we describe the implementation of a fault injection tool, which validates the dependability of a commercial cloud software stack. Hardware faults induced by high energy density environments can be injected; the fault propagation through the cloud software stack is traced, and quantitatively evaluated. Experimental results show that the integrated fault detection mechanism of the cloud system, such as fatal trap detectors, has left a detection margin of 20% silent data corruption to narrow down. We additionally propose two detection mechanisms, which proved good performance in fault detection of cloud systems.
4
Ben Hamouda, Marwa, Mohamed Najeh Lakhoua, and Lilia El Amraoui. "Dependability Evaluation and Supervision in Thermal Power Plants." International Journal of Electrical and Computer Engineering (IJECE) 5, no. 5 (October 1, 2015): 905. http://dx.doi.org/10.11591/ijece.v5i5.pp905-917.
Повний текст джерелаАнотація:
In order to improve the productivity and the consistency of its maintenance strategies, the industrial world is based on different techniques and tools developed to ensure safe operation and the supervision of production systems. In fact, dependability evaluation is crucial to controlling the risks associated with system failure, and for this reason, it is one of the fundamental steps in automated system design. In this paper, we present firstly the basic concepts for the study of dependability as well as functional systems analysis. Thus, we present the method SADT (Structured Analysis Design technique). Given the ineffectiveness of methods that are currently exploited are not appropriate because the level of complexity of such industrial systems, we propose in the first the Safe-SADT method which allows the explicit formalization of functional interaction, the identification of the characteristic values affecting complex system dependability, the quantification of RAMS parameters (Reliability, Availability, Maintainability, and Safety) for the system’s operational architecture. Secondly, a methodology for designing supervisory production systems has been presented and has been applied on an example of a SCADA (supervisory control and data acquisition) system of a thermal power plant. Finally, a model of operating safety and supervision of a production system is proposed<strong><em>.</em></strong>
5
Kulba, V. V., S. K. Somov, and A. B. Shelkov. "Analysing the effect of information redundancy on the dependability indicators of distributed information systems." Dependability 22, no. 1 (March 25, 2022): 4–12. http://dx.doi.org/10.21683/1729-2646-2022-22-1-4-12.
Повний текст джерелаАнотація:
Aim. The paper analyses the effect of information redundancy on the functional dependability indicators of distributed automated information systems. Information redundancy in the form of hot standby and HDD archives located in the system nodes is examined. Methods. The concepts of the probability theory and Markov processes are employed. Results. Indicators of operational dependability of distributed information systems and the effect of operational and recovery redundancy of data sets on these indicators are analysed. The paper analyses the efficiency of three backup strategies in distributed systems. Conclusions. Using information redundancy significantly improves the dependability and operational efficiency of distributed systems. At the same time, this type of redundancy requires a certain increase in operating costs.
6
S, Santhosh M., and Nagaraja G. S. "A Survey on Different Real Time Operating Systems." International Journal of Engineering and Advanced Technology 10, no. 5 (June 30, 2021): 221–23. http://dx.doi.org/10.35940/ijeat.e2762.0610521.
Повний текст джерелаАнотація:
To minimise development costs and enhance dependability, modern embedded system development is increasingly emphasising on software modularity and reuse. Microcontrollers are extensively employed in embedded applications that have a very specific and specialised job to complete. The embedded applications are always resource constraint which requires efficient utilization of available resources. A Real Time Operating System (RTOS) is frequently used in this context to plan task execution as well as enable intertask communication and synchronisation. This paper provides the survey of different RTOS available in market and their applications. Several open source RTOS such as Free RTOS, VxWorks, SmallRTOS and TinyOS are compared with respect to the scheduling algorithms used.
7
Di Giandomenico, Felicita, Antonia Bertolino, Antonello Calabrò, and Nicola Nostro. "An Approach to Adaptive Dependability Assessment in Dynamic and Evolving Connected Systems." International Journal of Adaptive, Resilient and Autonomic Systems 4, no. 1 (January 2013): 1–25. http://dx.doi.org/10.4018/jaras.2013010101.
Повний текст джерелаАнотація:
Complexity, heterogeneity, interdependency and, especially, evolution of system/services specifications, related operating environments and user needs, are more and more highly relevant characteristics of modern and future software applications. Taking advantage of the experience gained in the context of the European project Connect, which addresses the challenging and ambitious topic of eternally functioning distributed and heterogeneous systems, this paper presents a framework to analyse and assess dependability and performance properties in dynamic and evolving contexts. The goal is to develop an adaptive approach by coupling stochastic model-based analysis, performed at design time to support the definition and implementation of software products complying with their stated dependability and performance requirements, with run-time monitoring to re-calibrate and enhance the dependability and performance prediction along evolution. The proposed framework for adaptive assessment is described and illustrated through a case study. To simplify the description while making more concrete the approach under study, the authors adopted the setting and terminology of the Connect project.
8
Yu, Li Ming, Shou Qiang Wei, Tian Tian Xing, and Hong Liang Liu. "Reliability Analysis of Hybrid Actuation Based on GSPN." Advanced Materials Research 430-432 (January 2012): 1914–17. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1914.
Повний текст джерелаАнотація:
Generalized stochastic Petri nets is adopted to develop the reliability models of two operating modes of the hybrid actuation system, which is composed of a SHA (Servo valve controlled Hydraulic Actuator), an EHA (Electro-Hydrostatic Actuator) and an EBHA (Electrical Back-up Hydrostatic Actuator).The dependability of hybrid actuation is got through the Markov chain which the Petri nets sate is isomorphic to and the Monte-Carlo simulation. Simulations are conducted to analyze influences of the operating mode and the fault coverage on system reliability of hybrid actuation system.
9
Kimura, Shinichi, Yuki Asakura, Hiroaki Doi, and Masahiro Nakamura. "Document-Based Programming System for Seamless Linking of Satellite Onboard Software and Ground Operating System." Journal of Robotics and Mechatronics 29, no. 5 (October 20, 2017): 801–7. http://dx.doi.org/10.20965/jrm.2017.p0801.
Повний текст джерелаАнотація:
In satellites, onboard software is required to perform complicated mission sequences and autonomous scheduling, conduct preliminary data processing, and manage various onboard devices. The dependability of onboard software strongly affects the reliability of a satellite itself. Therefore, the onboard software must be both complex and reliable to perform complicated small satellite missions. We propose an automatic software generator to meet these requirements. This generates onboard software and a database for the ground operating system using satellite development documents, such as command and telemetry definition documents and fault detection, isolation, and recovery (FDIR) definition documents. By using this software generator, the software development load can be reduced and human error can be avoided, even if the definitions are modified in an ad hoc manner during the development process. The generator additionally enables the easy accommodation of user preferences and software depth variation during a mission.
10
Enders, Shelly J., Jason M. Enders, and Sheldon G. Holstad. "Drug-Information Software for Palm Operating System Personal Digital Assistants: Breadth, Clinical Dependability, and Ease of Use." Pharmacotherapy 22, no. 8 (August 2002): 1036–40. http://dx.doi.org/10.1592/phco.22.12.1036.33601.
Повний текст джерела
11
Antonov, A. V., V. A. Chepurko, and A. N. Cherniaev. "Study of the beta-factor model application for common cause failure modeling." Dependability 19, no. 2 (June 16, 2019): 9–17. http://dx.doi.org/10.21683/1729-2646-2019-19-2-9-17.
Повний текст джерелаАнотація:
Aim. Common cause failures (CCFs) are dependent failures of groups of certain elements that occur simultaneously or within a short period of time (i.e. almost simultaneously) due to a single common cause (e.g. a sudden change of climatic operating conditions, flooding of premises, etc.). A dependent failure is a multiple failure of several elements of a system, whose probability cannot be expressed as a simple product of the probabilities of unconditional failures of individual elements. ССА probabilities calculation uses a number of common models, i.e. the Greek letter model, alpha, beta factor and their variants. The beta-factor model is the most simple in terms of simulation of dependent failures and further dependability calculations. Other models, when used in simulation, involve combinatorial enumeration of dependent events in a group of n events that becomes labour-intensive if the number n is high. For the selected structure diagrams of dependability, the paper analyzes the calculation method of system failure probability with CCF taken into account for the beta-factor model. The Aim of the paper is to thoroughly analyze the beta-factor method for three structure diagrams of dependability, research the effects of the model parameters on the final result, find the limitations of beta-factor model applicability. Methods. The calculations were performed using numerical methods of solution of equations, analytical methods of function studies. Conclusions. The paper features an in-depth study of the method of undependability calculation for three structure diagrams that accounts for CCF and uses the beta-factor model. In the first example, for the selected structure diagram out of n parallel elements with identical dependability, it is analytically shown that accounting for CCF does not necessarily cause increased undependability. In the second example of primary junction of n elements with identical dependability, it is shown that accounting for CCF subject to parameter values causes both increased and decreased undependability. A number of beta factor model parameter values was identified that cause unacceptable values of system failure probability. These sets of values correspond to relatively high model parameter values and are hardly practically attainable as part of engineering of real systems with highly dependable components. In the third example, the conventional bridge diagram with two groups of CCFs is considered. The complex ambivalent effect of beta factor model parameters on the probability of failure is shown. As in the second example, limitations of the applicability of the beta-factor model are identified.
12
Korobeynikov, I. S., D. A. Vyrykhanov, and M. V. Mityaev. "Improving the dependability of the servo drives of unmanned aerial vehicles through optimized operating modes." Dependability 22, no. 4 (November 22, 2022): 16–22. http://dx.doi.org/10.21683/1729-2646-2022-22-4-16-22.
Повний текст джерелаАнотація:
Aim. Improving the reliability of servo drives through partial redundancy of structural components. Methods. The paper uses methods of harmonic analysis, technical system dependability theory. Results. The mean times to failure of servo drives that differ in terms of the level of redundancy of structural elements (external connectors, feedback sensors, control boards, electric motors and load gears) were compared. It was shown that structural element redundancy along with the capability to switch to still-operable elements in the course of servo drive operation enable a triple increase of the failure tolerance. The authors suggested criteria for identifying the moment of time for decision-making regarding an electric servo’s structure modification before the moment of failure of the redundant element of such servo. Conclusion. The method suggested in the paper allows formalizing the process of electric servo structure modification for the purpose of ensuring the required level of failure tolerance.
13
Hichri, Amal, Mansour Hajji, Majdi Mansouri, Kamaleldin Abodayeh, Kais Bouzrara, Hazem Nounou, and Mohamed Nounou. "Genetic-Algorithm-Based Neural Network for Fault Detection and Diagnosis: Application to Grid-Connected Photovoltaic Systems." Sustainability 14, no. 17 (August 24, 2022): 10518. http://dx.doi.org/10.3390/su141710518.
Повний текст джерелаАнотація:
Modern photovoltaic (PV) systems have received significant attention regarding fault detection and diagnosis (FDD) for enhancing their operation by boosting their dependability, availability, and necessary safety. As a result, the problem of FDD in grid-connected PV (GCPV) systems is discussed in this work. Tools for feature extraction and selection and fault classification are applied in the developed FDD approach to monitor the GCPV system under various operating conditions. This is addressed such that the genetic algorithm (GA) technique is used for selecting the best features and the artificial neural network (ANN) classifier is applied for fault diagnosis. Only the most important features are selected to be supplied to the ANN classifier. The classification performance is determined via different metrics for various GA-based ANN classifiers using data extracted from the healthy and faulty data of the GCPV system. A thorough analysis of 16 faults applied on the module is performed. In general terms, the faults observed in the system are classified under three categories: simple, multiple, and mixed. The obtained results confirm the feasibility and effectiveness with a low computation time of the proposed approach for fault diagnosis.
14
Madhapure, Ayush, Prajwal Deshmukh, Sumit Taywade, Ankush Nikalje, Swaraj Dhote, Rishikesh Deshmukh, and S. Yeole. "Design and Analysis of Multipurpose Relief Vehicle." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (May 31, 2022): 2233–43. http://dx.doi.org/10.22214/ijraset.2022.42804.
Повний текст джерелаАнотація:
Abstract: The rocker bogie suspension system has all the tough capabilities so that it can work in rough terrain because of its weight distributing property on all its 12 wheels. The only disadvantage of the mechanism is that its speed is slow. In this project during research we have deeply focused on the 12 wheels mechanism & its design which has certain advantages of linear bogie motion in defending the whole system or assembly from getting disengaged and rollover during working in high speed operations. This has magnificently increased the chances of dependability of structure on uneven surface & also its high speed examination with hurdle height capacity as double the diameter of the wheels .The requirement to develop a highly steady suspension system capable of operating in multi terrain surfaces while keeping all the wheels in contact with the ground. To design a machine that can navigate terrains where the left and right rockers independently climb different obstacles. Keyword: Rocker bogie mechanism, Rover, Multipurpose
15
Chiacchio, Ferdinando, Ludovica Oliveri, Soheyl Moheb Khodayee, and Diego D’Urso. "Performance Analysis of a Repairable Production Line Using a Hybrid Dependability Queueing Model Based on Monte Carlo Simulation." Applied Sciences 13, no. 1 (December 26, 2022): 271. http://dx.doi.org/10.3390/app13010271.
Повний текст джерелаАнотація:
Due to the augmented complexity of the factory on the one hand and the increased availability of information on the other hand, nowadays it is possible to design models of production lines able to consider the state of the health of the production system. Such models must combine both the deterministic and the stochastic behaviours of a system, with the former accounting for the mechanics and physics of the industrial process and the latter for randomness, including reliability of the production systems and the unpredictability of the maintenance and of the manufacturing lines. This study proposes the application of a Hybrid Dependability Modelling based on Monte Carlo simulation to estimate the performances of a repairable production line modelled with a queueing G/G/1 system. The model proposed is characterized by random interarrival and service times and by the wearing and dynamic aging phenomena of the machine tools that depend on the working and operating conditions.
16
Rajagopalan, Arul, Dhivya Swaminathan, Meshal Alharbi, Sudhakar Sengan, Oscar Danilo Montoya, Walid El-Shafai, Mostafa M. Fouda, and Moustafa H. Aly. "Modernized Planning of Smart Grid Based on Distributed Power Generations and Energy Storage Systems Using Soft Computing Methods." Energies 15, no. 23 (November 24, 2022): 8889. http://dx.doi.org/10.3390/en15238889.
Повний текст джерелаАнотація:
The modest objective is to check the integrated effect of energy storage systems (ESSs) and distributed generations (DGs) and compare the optimization of the size and location of ESS and DG to explore its challenges for smart grids (SGs) modernization. The research enlisted different algorithms for cost-effectiveness, security, voltage control, and less power losses. From this perspective, optimization of the distribution network’s energy storage and capacity are being performed using a variety of methods, including the particle swarm, ant-lion optimization, genetic, and flower pollination algorithms. The experimental outcomes demonstrate the effectiveness of these techniques in lowering distribution network operating costs and controlling system load fluctuations. The efficiency and dependability of the distribution network (DN) are both maximized by these strategies.
17
Zamyshliaev, A. М. "Premises of the creation of a digital traffic safety management system." Dependability 19, no. 4 (December 17, 2019): 45–52. http://dx.doi.org/10.21683/1729-2646-2019-19-4-45-52.
Повний текст джерелаАнотація:
Aim.The digital transformation of the traffic safety management system in JSC RZD involves top-level integration with the operating processes of all business units in terms of integral assessment of the risk of possible events and achievement of specified indicators. The result will be the merger of the traffic safety management system with the processes of all levels of the company’s management enabled by an integrated intelligent system for managing processes and services whose functionality includes real-time traffic safety management.Methods. The paper uses system analysis of existing approaches and methods of processing of large quantities of structured and unstructered data.Results. The paper examines the development stages of train traffic safety management, as well as automated information and control systems that enable traffic safety management. General trends in the creation of systems for collection and processing of information are analyzed. The applicability of such technologies as Big Data, Data Mining, Data Science as part of advanced control systems is shown. The paper examines the performance of the above technologies by analyzing the effect of various factors on the average daily performance of a locomotive, where, at the first level, such factors as average daily run of a locomotive, average trainload are taken into consideration; at the second level, the focus is on the service speed, locomotive turnover at station, etc.; at the sixth level, the focus is on the type of locomotive, its technical state, etc. It is shown that statistical methods of factor analysis and link analysis combined with such other methods of Data Mining as methods of simulation and prediction, the average daily performance of a locomotive can be planned proactively. The author proposes a procedure of migration towards a digital traffic safety management system that would be based on models of interaction of safety and dependability factors of all railway facilities at all railway levels of hierarchy, as well as in association with other factors that have no direct relation to dependability, yet affect the safety of the transportation process.Conclusions. The primary benefit of migration towards Big Data consists in the development of a dynamic model of traffic safety, the elimination of human factor in control systems. Most importantly, it enables the creation within the Russian Railways company (JSC RZD) of an integrated intelligent process and service management system that enables real-time traffic safety management. An extensive process of development and deployment within the company of the URRAN Single Corporate Platform (SCP) enabled executive decision support as regards risk-based functional dependability and safety of transportation facilities. Thus, the URRAN SCP sets the stage for the digital transformation of the traffic safety management system in JSC RZD.
18
Tork, Hamed, Saman Javadi, Seyed Mehdy Hashemy Shahdany, Ronny Berndtsson, and Sami Ghordoyee Milan. "Groundwater Extraction Reduction within an Irrigation District by Enhancing the Surface Water Distribution." Water 14, no. 10 (May 17, 2022): 1610. http://dx.doi.org/10.3390/w14101610.
Повний текст джерелаАнотація:
Today, in developing countries, the low surface water distribution efficiency and the lack of supplying water needs of farmers by surface water resources are compensated by excessive aquifer water withdrawal. This mismanagement has caused a sharp drop in the groundwater level in many countries. On the other hand, climate change and drought have intensified the pressure on water resources. This study aims to evaluate novel strategies for developing surface water distribution systems for stress reduction of the Najafabad aquifer in Isfahan, central plateau of Iran. The performance of several strategies for agricultural water distribution and delivery, such as hydro-mechanical operating system, manual-based operating system, and centralized automatic operating system, was evaluated in this study. In the first step, two indices, i.e., water distribution adequacy and dependability, were obtained using a flow hydraulic simulation model. Then, the water distribution adequacy map and amount of reduction in the water withdrawal of existing wells were determined for each strategy. Finally, using the MODFLOW groundwater simulation model, the changes in groundwater levels due to the normal and drought scenarios (15 and 30%) were extracted during five years for each strategy. The findings for the normal scenario showed that the centralized automatic operating system strategy had the most significant impact on agricultural water management in the surface water distribution system with a 30% increase in agricultural water distribution adequacy index compared to the current situation. This strategy increased the groundwater level by 11.6 m and closed 35% of the groundwater wells. In this scenario, the hydro-mechanical operating system strategy had the weakest performance by increasing the aquifer level by only 1.31 m. In the 15% and 30% drought scenarios, the centralized automatic operating system strategy exerted the best performance among other strategies by increasing the aquifer water level by 10.18 and 9.4 m, respectively, compared to the current situation. Finally, the results showed that the spatial segmentation of the aquifer exerted better efficiency and better monitoring in the more susceptible regions.
19
Стрєлкіна, Анастасія Андріївна. "ІНФОРМАЦІЙНА ТЕХНОЛОГІЯ ОЦІНЮВАННЯ І ЗАБЕЗПЕЧЕННЯ ГАРАНТОЗДАТНОСТІ МЕДИЧНИХ ІоТ СИСТЕМ". RADIOELECTRONIC AND COMPUTER SYSTEMS, № 3 (30 вересня 2019): 48–54. http://dx.doi.org/10.32620/reks.2019.3.05.
Повний текст джерелаАнотація:
Healthcare systems operating in the Internet of things are becoming more widespread and their impact is predicted to only increase. However, new concepts and applications of the latest technologies carry some risks, including the failure of end-user devices, infrastructure, which in turn can lead to the worst outcome. In this regard, the problems of evaluation and assurance when using this technology are increasing. The object of research and analysis in this work is a medical system that operates on the Internet of Things. The purpose of this study is to describe and develop the structure and functional scheme of information technology (IT) dependability assessment and providing of healthcare systems based on the Internet of Things, which is based on models, methods and procedures for evaluation and assurance and formalized design methods that contain such stages of synthesis design decisions: model selection, method selection, problem solving and decision making. The process of the information technology creating consists of such steps as determining: the basic processes that occur when evaluating and ensuring the security of medical IoT systems; input data; source data; elements of mechanisms; controls. The developed structure of information technology consists of the following processes: formation of requirements for the warranty of medical IoT systems; identifying components of medical IoT systems that are susceptible to failure and cyberattack; determination of indicators of availability of medical IoT systems; definition of indicators of functionality of healthcare devices; selection of countermeasures to protect the healthcare IoT system against cyberattacks; case-oriented assessment of cybersecurity of healthcare IoT systems. As a result, this paper provides an IDEF0 diagram of the information technology of dependability assessment and providing healthcare systems based on the Internet of Things. The basic stages of the implementation of the developed information technology are also presented.
20
Dratsas, Pantelis A., Georgios N. Psarros, and Stavros A. Papathanassiou. "Feasibility of Behind-the-Meter Battery Storage in Wind Farms Operating on Small Islands." Batteries 8, no. 12 (December 6, 2022): 275. http://dx.doi.org/10.3390/batteries8120275.
Повний текст джерелаАнотація:
This paper investigates the anticipated benefits from the introduction of a battery energy storage system (BESS) behind-the-meter (BtM) of a wind farm (WF) located in a small non-interconnected island (NII) system. Contrary to the standard storage deployment applications for NII, where storage is either installed in front of the meter as a system asset or integrated into a virtual power plant with renewable energy sources, the BESS of this paper is utilized to manage the power injection constraints imposed on the WF, aiming to minimize wind energy curtailments and improve WF’s yield. A mixed integer linear programming generation scheduling model is used to simulate the operation of the system and determine the permissible wind energy absorption margin. Then, a self-dispatch algorithm is employed for the operation of the WF–BESS facility, using the BESS to manage excess wind generation that cannot be directly delivered to the grid. Additionally, the contribution of BESS to the capacity adequacy of the NII system is investigated using a Monte Carlo-based probabilistic model, amended appropriately to incorporate storage. Finally, an economic feasibility analysis is carried out, considering the possible revenue streams. By examining several BESS configurations, it has been shown that BtM BESS reduces energy curtailments and contributes substantially to resource adequacy as its energy capacity increases. However, the investment feasibility is only ensured if the capacity value of the BtM storage is properly monetized or additional dependability of wind production is claimed on the ground that the inherent intermittency of the wind production is mitigated owing to storage.
21
Yang, Min J., and Paul W. Yang. "An IBM PC Based Computer Program for the Analysis of Infrared Spectra." Applied Spectroscopy 45, no. 10 (December 1991): 1739–45. http://dx.doi.org/10.1366/0003702914335337.
Повний текст джерелаАнотація:
A computerized infrared interpreter has been developed on an IBM personal computer (PC) running under the Microsoft disk operating system (DOS). Based on the original Merck Sharp & Dhome Research Laboratory Program for the Analysis of InfRared Spectra (PAIRS), this infrared interpreter, PC PAIRS+, is capable of analyzing infrared spectra measured from a wide variety of spectrophotometers. Modifications to PAIRS now allow the application of both artificial intelligence and library searching techniques in the program. A new algorithm has been devised to combine the results from the library searching and the PAIRS program to enhance the dependability of interpretational data. The increased capability of this infrared interpreter along with its applicability on a personal computer results in a powerful, general-purpose, and easy-to-use infrared interpretation system. Applications of PC PAIRS+ on petrochemical samples are described.
22
Stankovic, Tatjana, Mile Stojcev, and Goran Djordjevic. "On VHDL synthesis of self-checking two-level combinational circuits." Facta universitatis - series: Electronics and Energetics 17, no. 1 (2004): 69–79. http://dx.doi.org/10.2298/fuee0401069s.
Повний текст джерелаАнотація:
Concurrent error detection (CED) is an important technique in the design of system in which dependability and data integrity are important. Using the separable code for CED has the advantage that no decoding is needed to get the normal output bits. In this paper, we address the problem of synthesizing totally self-checking two level combinational circuits starting from a VHDL description. Three schemes for CED are proposed. The first scheme uses duplication of a combinational logic with the addition of a totally self-checking comparator. The second scheme for synthesizing combinational circuits with CED uses Bose-Lin code. The third scheme is based on parity codes on the outputs of a combinational circuit. The area overheads and operating speed decreases for seven combinational circuits of standard architecture are reported in this paper.
23
Merkin-Janson, Leonid Al'bertovich, Ruslan Maratovich Rezin, and Nikolay Konstantinovich Vasilyev. "Architecture of the Formally-Verified Distributed Ledger System InnoChain." Modeling and Analysis of Information Systems 27, no. 4 (December 20, 2020): 472–87. http://dx.doi.org/10.18255/1818-1015-2020-4-472-487.
Повний текст джерелаАнотація:
In this paper we consider the software architecture of InnoChain, a distributed ledger system (DLS) with 5 levels of formal verification, including a formally-verified underlying operating system (OS). The objective of this architecture is to achieve a higher level of DLS dependability compared to more traditional software architectures and quality assurance (QA) methods. The architecture of InnoChain includes (1) a programming language for smart contracts which is a domain-specific language with formal semantics embedded into CakeML, which is a functional language ofthe ML family; this allows us to carry out formal verification of smart contracts' correctness properties using higher-order logic systems, such as HOL4; (2) trusted compilation of smart contracts into the machine code using the verified compiler available for CakeML, rather than relying on a virtual machine for execution of smart contracts; (3) using CakeML for implementation of InnoChain node functionality which allows for formal verification of code correctness and trusted compilation into the machine code; (4) formal verification of the consensus protocol used InnoChain, namely HotStuff BFT; (5) using seL4, a formally-verified microkernel, as the underlying OS for InnoChain instead of more traditional general-purpose OSes such as Linux. The proposed verified architecture will allow InnoChain to be used in mission-critical applications, such as the decentralized Aircraft Fuelling Control System which is currently under development for JSC Aeroflot, the Russian national air carrier.
24
Wei, Chang, Peng Wang, Yiming Ma, and Ruoxi Li. "Innovative Design of a Healthy and Environmentally Friendly Intelligent Cleaning Robot in a Smart City Public Environment." Journal of Environmental and Public Health 2022 (August 21, 2022): 1–12. http://dx.doi.org/10.1155/2022/1602125.
Повний текст джерелаАнотація:
With the expansion of modern society, there has been a substantial increase in the number of structures with multiple stories. Skyscrapers are not only the dream of incredible architects that desire to command the sky, but they have also transformed and defined how we live in the modern day. Building walls, on the other hand, are constantly affected by acid rain, dust and mist, meteorites, and bird droppings since they are exposed for lengthy periods of time. Furthermore, the challenges of cleaning at great heights are becoming increasingly critical. Figuring out how to most efficiently maintain the outside surfaces of skyscrapers so as to extend their longevity, as well as their worth in urban contexts, is a major concern for the health and cleanliness of the public environment in modern cities. The creation of “smart cities” offers a huge opportunity to achieve this goal. A PLC control system for an intelligent cleaning robot was presented in this study, together with its wire design, control demands, hardware selection, and control system. Furthermore, it provided a design for a cleaning robot that would operate within the context of a smart city. A PLC system would be used in this design to detect the cleaning position and initiate automatic cleaning. The operation of the system revealed that the PLC-based intelligent cleaning robot control system has high dependability, strong operating efficiency features, and a high promotional value.
25
Chen, Ziyu, Dengyu Ba, and Kehui zhuang. "Solar Preheating in Power Plants: An Overview Of The Current State Of The Technology." International Journal of Advanced Science and Computer Applications 1, no. 1 (December 30, 2021): 10–15. http://dx.doi.org/10.47679/ijasca.v1i1.4.
Повний текст джерелаАнотація:
Utilizing preheating units is one of the most critical ways to improve the performance of thermal power plants. Increasing the overall efficiency of Brayton or Rankine cycles by preheating the air or stream may result in considerable increases in output power and efficiency. When it comes to renewable energy, solar energy is an appealing alternative for use as a source of preheating since it is readily accessible. The current article discusses the use of solar energy for preheating air and steam in thermal power plants, as well as other uses. The performance of the systems is being improved, according to evaluations, as a result of a variety of elements, including the configuration of the reference system, the operating environment, the applied technology, and so on. Aside from improving the overall efficiency of the power plant, the incorporation of a solar preheating system may significantly decrease fuel usage and, as a result, carbon dioxide emissions. Furthermore, owing to the unavailability of solar energy during the night and overcast hours, thermal storage units may improve the system's dependability while also increasing the contribution of solar energy to the system's output.
26
Li, Yi, Ping Xu, and Han Wan. "A Fault Injection System Based on QEMU Simulator and Designed for BIT Software Testing." Applied Mechanics and Materials 347-350 (August 2013): 580–87. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.580.
Повний текст джерелаАнотація:
An important step in the development of dependable systems is the validation of their fault tolerance properties. Fault injection has been widely used for this purpose. This paper presents a simulator implemented fault injection and monitoring environment based on the QEMU platform, called BitVaSim, which is targeted for the embedded development boards equipped with PowerPC or ARM processor together with Built-In Test software operating environment.BitVaSim takes advantage of simulation and do no harm or irruption to either the real hardware or the software, in addition, all the simulated parts are reachable so that more fault modes are available to achieve.BitVaSim uses abstract key-value pairs to describe the functional fault modes, and then simulates the hardware board as while as realistic faults incurred by hardware into the simulator, in order to monitor the activation of the faults and their impact on the target system especially the BIT system behavior in detail. Fault injection interfaces are configured to implement failure mode matching and fault conditions triggering to inject faults on demand in simulator runtime.Faults injected by BitVaSim can affect any process running on the target system (including the kernel), and it is possible to inject faults in applications for which the source code is not available.Experimental results are presented to demonstrate the accuracy and potential of BitVaSim in the evaluation of the dependability properties of the complex computer systems and the BIT system.
27
Li, Xiaowu. "Design of Local Sharing Algorithm for Enterprise Financial Information Based on User-Defined Protocol." Mobile Information Systems 2022 (August 8, 2022): 1–10. http://dx.doi.org/10.1155/2022/1045286.
Повний текст джерелаАнотація:
The financial shared service model now has a technological base thanks to recent advancements in the information technology sector. Cloud computing, big data, and other technologies are included. To some extent, it has produced the current financial shared service model. This service model not only realizes the front-end information input but also ensures the specialization of financial data. The business data provided from the front end may be translated into the financial data required by finance using the enterprise resource planning (ERP) system. It overcomes the drawbacks of the existing financial system while also increasing its operating efficiency. The financial sharing service offers a high level of standardization of financial procedures while simultaneously lowering financial management costs. This allows the enterprise group to handle the financial systems of its subsidiaries in a uniform manner. It promotes the transparency of financial information, improves the overall competitive level of the enterprise group, and creates huge economic benefits for the enterprise group. Therefore, in the current operation stage of enterprises, the method of using the scientific service mode to maximize the economic benefits of enterprises has become an important problem. It is unlikely that understanding how to utilize it appropriately will have an impact on business operations. To ensure that enormous volumes of data are sent in an efficient and reliable manner, Gigabit Ethernet is used for the data transmission interface in this paper. On the one hand, an application layer user-defined protocol is meant to provide data transfer with high efficiency, speed, and reliability, while, on the other hand, on the basis of interface hardware program design, it is proposed to complete the modular design through the packaging of P core. It is the hardware foundation for interface data transfer. Finally, tests to validate its efficiency, speed, and dependability are devised.
28
Trezzy, Mickael, Ileana Ober, Iulian Ober, and Raquel Oliveira. "Applying MDE to ROS Systems: A Comparative Analysis." Scientific Annals of Computer Science 31, no. 1 (August 9, 2021): 111–44. http://dx.doi.org/10.7561/sacs.2021.1.111.
Повний текст джерелаАнотація:
The Robot Operating System (ROS) is one of the most used software framework to develop robot applications. Although it is possible to reuse packages and code from other ROS projects, ROS applications remain low level and reasoning at a higher level of abstraction is not possible. Using Model-Driven Engineering (MDE) in the context of ROS applications would allow to increase the accessibility of ROS, leverage the reusability of packages and supply validation of the software earlier in the design, using formal methods. For instance, formal verification methods would improve the overall dependability of robotic systems. Our view is that we should increase the abstraction of the systems through models using MDE methodology in order to enable the use of formal methods on ROS applications. In this paper we do a first step toward this and propose a comparative study of existing modeling alternatives aiming to help roboticists to smoothly adopt MDE. This study compares the use of modeling in ROS systems in three different ways: by means of direct UML modeling, a ROS UML profile and a ROS Domain-Specific Language. That allows us to pick the solution that better fits our needs.
29
Li, Yan, Peng Xiang, and Yandong Chen. "A Secondary Reconfigurable Inverter and Its Control Strategy." Applied Sciences 10, no. 20 (October 9, 2020): 7021. http://dx.doi.org/10.3390/app10207021.
Повний текст джерелаАнотація:
This article proposes a topology of the secondary reconfigurable inverter and the corresponding fault-tolerant control strategy. When the secondary reconfigurable inverter is operating normally, its topology structure is the TPSS circuit. When the power semiconductor devices in the inverter are faulty, the inverter circuit needs to be reconfigured. After removing the faulty power semiconductor devices, the remaining power semiconductor devices and the DC side powers are reconstructed as the TPFS structure to keep the system running normally. This article also proposes a switch-pulse-resetting algorithm. This paper adopts the control strategy connecting the constant-voltage, constant-frequency control method with the switch pulse resetting algorithm. It need not change the control algorithm when the proposed reconfigurable inverter is transformed from the normal running state into the faulty running state. The inverter dependability is greatly improved. Finally, the feasibility and effectiveness of the proposed second reconfigurable inverter topology and control strategy are verified by simulation and experiment.
30
Adablanu, Selorm. "Review on Automatic Smart Car Parking System." International Journal of Computer Science and Mobile Computing 11, no. 8 (August 30, 2022): 79–82. http://dx.doi.org/10.47760/ijcsmc.2022.v11i08.006.
Повний текст джерелаАнотація:
The purpose of this study is to provide an automated, user-friendly, and dependable parking system. Even if parking spots are known, many cars may chase them down, severely clogging the roads. In this study, we build and put into practice a smart parking system prototype. The suggested system has three operating modes: ON, OFF, and EMERGENCY. Through an IR sensor, the system was able to detect the presence of the automobiles blocking the main parking entrance. These IR sensors output data to the PLC (programmable logic controller). A worldwide trend is moving toward automatic automobile parking systems to determine precisely how much space is available for cars and to collect money as parking fees due to a scarcity of parking places and trained personnel. This new plan enhances the present auto parking system's dependability, and it can be readily put into place since it is highly cost-effective—using solar panels to provide all of its power—and the inexpensive IR sensor lowers the overall implementation cost. This type of equipment is important to address the issue of a lack of parking space in crowded cities since it is completely automated and assigns each user a unique ID that corresponds to the trolley that is assigned to them. The proportion of Indians who own cars and motorbikes has lately grown, boosting metropolitan traffic, as a result of changing economic behavior and an improvement in living standards. In order to facilitate the transportation network and guarantee the quality of urban life, parking difficulties will present a significant obstacle. In most major cities, it can be challenging for drivers to find a parking spot, especially during rush hour. The problem comes from not knowing where the open spots could be at that moment.
31
Fan, Xiaoxiang. "Multiobjective Optimal Dispatching Method of Generalized Power Active Distribution Network Based on Game Theory." Security and Communication Networks 2021 (October 29, 2021): 1–10. http://dx.doi.org/10.1155/2021/2559449.
Повний текст джерелаАнотація:
To improve the operating dependability of a generalized power active distribution network, a multiobjective optimal scheduling approach based on game theory is proposed. The active distribution network's multistakeholder coordinated and optimal dispatching mode is then established, and the game interaction between various stakeholders in the generalized power active distribution network is evaluated. Using the multistakeholder game coordinated and optimal dispatching strategy, manage and regulate the distribution firms, distributed generation operators, and users engaging in demand response in the active distribution network, to guarantee that the distribution system runs smoothly and fairly. The rate of renewable energy usage, network loss, and user satisfaction are all factored into the multiobjective optimum scheduling objective function of a generalized power active distribution network. Using the multistakeholder game coordinated and optimal dispatching strategy, manage and regulate the distribution firms, distributed generation operators, and demand response participants in the active distribution network, to make sure the distribution system runs smoothly and equitably. Taking into account the rate of renewable energy usage, network loss, and user satisfaction, a multiobjective optimum scheduling objective function for a generalized power active distribution network is thus created.
32
Alasali, Feras, Abdelaziz Salah Saidi, Naser El-Naily, Mahmoud A. Smadi, and William Holderbaum. "Hybrid Tripping Characteristic-Based Protection Coordination Scheme for Photovoltaic Power Systems." Sustainability 15, no. 2 (January 13, 2023): 1540. http://dx.doi.org/10.3390/su15021540.
Повний текст джерелаАнотація:
Due to the high penetration of renewable energy sources into the electrical power network, overcurrent relays coordination with highly sensitive and selective protection systems are now two of the most important power protection concerns. In this research, an optimal coordination strategy utilising a new hybrid tripping scheme based on current–voltage characteristics has been devised for overcurrent relays in a power network coupled to a photovoltaic system. This research develops and proves a new optimal coordination scheme based on two optimisation methods, the vibrating particles system and particle swarm optimisation algorithms, in consideration of the impact of renewable sources on fault characteristics. The new optimal coordination approach aims to improve the sensitivity and dependability of the protection system by reducing the tripping time of the overcurrent relays by employing a new hybrid tripping scheme. A specific case study, Conseil International des Grands Réseaux Electriques (CIGRE) distribution network connected to two photovoltaic systems is constructed and presented utilising Industrial software (namely ETAP), and the outcomes of the proposed optimal coordination scheme are compared with standard and recent characteristics from the literature. The hybrid tripping scheme and optimisation techniques are evaluated using different fault and power network model scenarios. The results show that the optimal hybrid tripping scheme provided successfully decreases the overall operating time of the overcurrent relays and increases the sensitivity of the relay during all fault scenarios. The reduction in overall time for the proposed hybrid tripping scheme was 35% compared to the literature for the scenario of a power grid with and without photovoltaic systems.
33
Лисенко, Сергій Миколайович, Вячеслав Сергійович Харченко, Кіра Юліївна Бобровнікова та Роман Володимирович Щука. "РЕЗИЛЬЄНТНІСТЬ КОМП’ЮТЕРНИХ СИСТЕМ В УМОВАХ КІБЕРЗАГРОЗ: ТАКСОНОМІЯ ТА ОНТОЛОГІЯ". RADIOELECTRONIC AND COMPUTER SYSTEMS, № 1 (28 січня 2020): 17–28. http://dx.doi.org/10.32620/reks.2020.1.02.
Повний текст джерелаАнотація:
The rapid development of information technology has expanded the capabilities of cyberthreads regarding computer systems. Cybercriminals are developing new ways to avoid attack detection, so existing approaches are not able to withstand the growing threat of attacks. Meanwhile, the consequences of cyberattacks are becoming more dangerous and destructive. One of the approaches to solve the problem is the construction of resilient systems that are able to quickly recover and continue to function under attack conditions. The subject of research is the construction process of the resilient computer systems in the face of cyber threats. The goal is to develop a taxonomy and ontology of resilient computer systems under cyberthreats. Results. The article presents the definitions of the resilience from the point of view of cybersecurity, presents the gap between the concepts of resilience and dependability. The paper presents the main elements of the taxonomic scheme of computer system resilience, which include threats (changes in the environment and requirements, network attacks, attacks on software, software and hardware vulnerabilities, errors, failures), information and technical conditions that computer system passes during its operating cycle, the principles on which resilience is based (proactivity, adaptability, resistance, diversity, elasticity, controlled degradation, defense in depth, ability to evolvability), as well as primary and secondary properties. Based on the above elements, a generalized taxonomic scheme of resilience related to information security has been developed. The work presents the operational cycle of a resilient CS as a set of information and technical states that the system goes through (preparation, system protection, threat detection, threat absorption, response to a threat, system recovery after a cyberattack, adaptation.) An ontology scheme of the resilience from the point of view of information security of computer systems in the presence of cyberthreats is developed. Conclusions A taxonomy and ontology of resilient computer systems in the presence of cyberthreats has been developed.
34
Kadam, Ms Mrunali. "Simulation based of DC-DC Converter for AVR System and PID Controller with Tree Seed Algorithm based AVR System for Synchronous Generator." International Journal for Research in Applied Science and Engineering Technology 9, no. VII (July 20, 2021): 1959–69. http://dx.doi.org/10.22214/ijraset.2021.36775.
Повний текст джерелаАнотація:
The voltage is supervised by AVR an automatic voltage regulator. It transforms the varying voltage into a constant voltage. The most prevalent cause of voltage fluctuation is changes in load on the supply system. An excitation system is a system that provides the necessary field current to the synchronous machine's rotor winding. The most important characteristics of an excitation system are dependability under all operating circumstances, ease of control, and ease of maintenance, stability, and quick transient response. In the literature, several control systems, such as in the literature, PID controllers, adaptive control methods, and intelligent control methods have all been suggested. On the one hand to get an accurate and quick generator terminal voltage control, the usage of a step down chopper in the exciter circuit is suggested in this study. DC-DC converters are also called as Choppers. The Step down chopper, It changes a given DC input voltage into a determined DC output voltage The input voltage source is tie up with governable solid state device that acts as a switch. Switches can be made using metal oxide semiconductor field effect transistors (MOSFETs) or insulated gate bipolar transistors (IGBT). The field circuit of the generator is associated to the chopper and a Praportional-Intigral controller deviates the converter duty cycle to vary the generator's terminal voltage. to regulate the generator field voltage. On the other hand, Tree-Seed Algorithm (TSA) algorithm based PID controller is put forward for automatic voltage regulator system. The suggested approach calculates PID coefficients to the best of its ability. The execution of this TSA-based optimum PID controller is compared to that of various PID controllers produced in the literature utilizing different meta-hermetic optimization techniques. Comparative research in for the suggested schemes has a superior transient response and is more resistant to fluctuations in Generator load and DC input voltage.
35
Abid, M., S. Laribi, M. Larbi, and T. Allaoui. "Diagnosis and localization of fault for a neutral point clamped inverter in wind energy conversion system using artificial neural network technique." Electrical Engineering & Electromechanics, no. 5 (September 6, 2022): 55–59. http://dx.doi.org/10.20998/2074-272x.2022.5.09.
Повний текст джерелаАнотація:
Introduction. To attain high efficiency and reliability in the field of clean energy conversion, power electronics play a significant role in a wide range of applications. More effort is being made to increase the dependability of power electronics systems. Purpose. In order to avoid any undesirable effects or disturbances that negatively affect the continuity of service in the field of energy production, this research provides a fault detection technique for insulated-gate bipolar transistor open-circuit faults in a three-level diode-clamped inverter of a wind energy conversion system predicated on a doubly-fed induction generator. The novelty of the suggested work ensures the regulation of power exchanged between the system and the grid without faults, advanced intelligence approaches based on a multilayer artificial neural network are used to discover and locate this type of defect; the database is based on the module and phase angle of three-phase stator currents of induction generators. The proposed methods are designed for the detection of one or two open-circuit faults in the power switches of the side converter of a doubly-fed induction generator in a wind energy conversion system. Methods. In the proposed detection method, only the three-phase stator current module and phase angle are used to identify the faulty switch. The primary goal of this fault diagnosis system is to effectively detect and locate failures in one or even more neutral point clamped inverter switches. Practical value. The performance of the controllers is evaluated under different operating conditions of the power system, and the reliability, feasibility, and effectiveness of the proposed fault detection have been verified under various open-switch fault conditions. The diagnostic approach is also robust to transient conditions posed by changes in load and speed. The proposed diagnostic technique's performance and effectiveness are both proven by simulation in the SimPower /Simulink® MATLAB environment.
36
Wang, Jialiang. "RF Circuit EMI Suppression and EMC Analysis." Highlights in Science, Engineering and Technology 27 (December 27, 2022): 820–25. http://dx.doi.org/10.54097/hset.v27i.3851.
Повний текст джерелаАнотація:
The radio frequency circuit will generate strong electromagnetic interference in the process of signal transmission, and its own resistance to electromagnetic interference is weak, and the radio frequency circuits operating in the same electromagnetic environment are prone to mutual interference. Therefore, it is necessary to analyze the electromagnetic interference effect of radio frequency circuits, and then find effective suppression measures, build a good public electromagnetic environment, realize electromagnetic compatibility, and ensure the reliability of signal transmission. This research first briefly introduces electromagnetic interference and electromagnetic compatibility and then analyzes the key points of electromagnetic interference suppression in radio frequency circuits. On this basis, the specific application of electromagnetic interference suppression and electromagnetic compatibility technology of radio frequency circuit is discussed. It can serve as a guide for the design of the radio frequency circuit by analyzing the characteristics and suppression mechanism of the electromagnetic interference of the radio frequency circuit. To ensure the suppression impact of electromagnetic interference, various suppression measures are broadly implemented in accordance with the three components of electromagnetic interference. The electromagnetic compatibility-based design of RF circuits can reduce the mutual interference of RF circuits in the system and guarantee the stability and dependability of signal transmission.
37
Gecha, V. Ya, R. N. Barbul, N. I. Sidniaev, and Yu I. Butenko. "Method of dependability assessment of spacecraft in design and engineering studies." Dependability 19, no. 2 (June 16, 2019): 3–8. http://dx.doi.org/10.21683/1729-2646-2019-19-2-3-8.
Повний текст джерелаАнотація:
The paper examines the matters of operational dependability of space systems (SS), efficiency of complex systems, use of redundancy in spacecraft (SC) design. It presents methods of predicting the dependability of designed devices, design of devices with desired dependability and comparison of dependability of various SS. For that purpose, the authors set forth the fundamentals of the dependability theory for SS design, methods of collection and processing of data of equipment dependability based on the results of operation and special dependability tests. Methods, mathematical models are developed, the equipment architecture at the stage of design and manufacture is analyzed. The paper also cites the design ratios for various tested types of redundancy, lifetime extension of SC units based on the residual operating life estimation method. The existing methods of dependability analysis are classified and examined. The authors outline the problems of ambiguity of information of the input data in case of classical computing. The effect of nominal deviations of the external effects, irregularity of the failure rate, non-linear nature of the effect of external factors on the dependability are examined. The paper also takes a look at the way the external factors affect the dependability and the degree to which such factors are taken into consideration in the existing methods. It is noted that the qualitative, technical and organizational (design and software) requirements for dependability in the technical specifications for each stage of elements and SS development, shall be observed and confirmed at the respective stage of activities. The paper presents the methods of estimation of technical item operating life with the focus on those based on the physical premises of operating life depletion. Attention is drawn to the importance of the economic aspect in the research dedicated to SS lifetime extension.
38
Abro, Junaid Hussain, Chunlin Li, Muhammad Shafiq, A. Vishnukumar, Shivlal Mewada, Kamlesh Malpani, and Jonathan Osei-Owusu. "Artificial Intelligence Enabled Effective Fault Prediction Techniques in Cloud Computing Environment for Improving Resource Optimization." Scientific Programming 2022 (September 22, 2022): 1–7. http://dx.doi.org/10.1155/2022/7432949.
Повний текст джерелаАнотація:
The bulk of the fault tolerance techniques that are in use today laid their primary emphasis, in the event that a virtual machine fails, on the production of clones to replace it, rather than on the early prediction of the failure itself in advance. Several of the currently used techniques give migration priority over recovery in the event that a virtual machine (VM) fails. This is due to resource constraints and concerns with server availability. Examples of algorithms with a single objective include fault tolerance, migration prediction, and simply expecting failure. Another example is fault tolerance. In this research, we are aiming to determine the most effective strategy to transition from a system that is not operating well to one that does. It is essential to be able to predict the failure of a virtual machine in a timely manner due of issues such as squandered resources, energy, and cost. Since the beginning of cloud computing, there has been an issue with the dependability of virtual computers, often known as VMs. As an integral component of a fault tolerance system, preemptive measures are an absolute need in order to guarantee the continuation of service. As a consequence of this, it is vital to work toward enhancing and emphasizing the proactive failure prediction of virtual machines. The key motivations for this are decreased periods of downtime and enhanced scalability. A technique was utilized to transfer the resources that were predicted to fail from one virtual machine (VM) to another VM in a safe manner. Using the compression strategy reduced the amount of time needed to complete the migration, and resource utilization increased. This article provides artificial intelligence that enables effective fault prediction techniques in cloud computing to improve resource optimization.
39
Shubinsky, I. B., H. Schäbe, and E. N. Rozenberg. "On the safety assessment of an automatic train operation system." Dependability 21, no. 4 (December 28, 2021): 31–37. http://dx.doi.org/10.21683/1729-2646-2021-21-4-31-37.
Повний текст джерелаАнотація:
The paper examines the automatic train operation system as part of the locomotive control and protection system, the remote supervision centre’s means for control of onboard and trackside machine vision facilities. The focus is on the dependence of the system’s safety and dependability on the dependability characteristics of its components and adverse weather effects. The criteria of a system’s wrong-side and right-side failures were defined, the graph models were constructed of the safety and dependability states of an automatic train operation system. The Markovian graph method of calculating the safety and dependability of complex systems was substantiated. That allowed defining such key safety indicators of an automatic train operation system as the mean time to wrong-side failure, probability of wrong-side failure, wrong-side failure rate. The study established that the safety of an automatic train operation system primarily depends on the dependability of machine vision facilities. The growth of the system’s wrong-side failure rate is limited to half the failure rate of machine vision facilities. It was also established that the dependability of an automatic train operation system is defined by the failure rate of a locomotive control and protection system and the failure rate of machine vision facilities. The conducted analysis allows concluding that in order to achieve an acceptable level of safety of an automatic train operation system, efforts should focus on machine vision redundancy, ensuring the SIL4 functional safety of on-board and trackside machine vision facilities, as well as regular comparison of the outputs of on-board and trackside machine vision facilities, redundant output comparison, integration of the outputs in motion. Additionally, adverse weather effects are to be countered by improving the efficiency of machine learning of the machine vision software.
40
Augustyn, Sławomir. "Crew – Spacecraft – Environment Anthropotechnical System in View of Engineering Systems." Research Works of Air Force Institute of Technology 41, no. 1 (June 1, 2018): 93–117. http://dx.doi.org/10.2478/afit-2018-0004.
Повний текст джерелаАнотація:
Abstract The publication describes an example of the anthropotechnical system (crew-spacecraft-environment) in view of engineering systems, which enables to shape their dependability by simultaneously ensuring the safety of space flight operations and more economical operations. Further research on developing the anthropotechnical system should involve the implementation of the elements of artificial intelligence based on expert systems or artificial neural networks.
41
Belkacem, Imad, Safia Nait Bahloul, and Oum-El-Kheir Aktouf. "Data Analysis of an RFID System for Its Dependability." International Journal of Embedded and Real-Time Communication Systems 5, no. 3 (July 2014): 1–22. http://dx.doi.org/10.4018/ijertcs.2014070101.
Повний текст джерелаАнотація:
Dependability issues become more and more significant in RFID (Radio Frequency Identification) development and especially in critical domains. However, Operations of reading, detection of readers, and measurements of sensors in a RFID system are inevitably subjected to errors. These factors degrade the overall dependability of RFID systems. The authors study the Fault Tolerance in RFID systems as a means to ensure the dependability. The authors propose to perform a statistical analysis on the RFID tags data, using a confidence interval, at the level of the middleware enabling the detection of erroneous readers and sensors.
42
Nowakowski, Waldemar, Zbigniew Łukasik, and Krzysztof Łukomski. "Dependability of computer railway automation systems." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 12 (December 31, 2018): 163–67. http://dx.doi.org/10.24136/atest.2018.376.
Повний текст джерелаАнотація:
IT development contributes to the fact that this technology is used in many fields concerning the economic and social life. It also contributes to a fast technological development of railway automations systems that are computer systems nowadays. Progress that undoubtedly must be noted, has to be followed by maintaining by these systems high quality standards, resulting mainly from ensuring safety. Such condition can be achieved, among others, through integrating works connected with reliability and security, by aiming at achieving dependability of the systems. This article presents the problem of the dependability of railway automation systems understood as their operating reliability, which allows to trust tasks accomplished by these systems.
43
Dolganov, A. I. "On the consideration of progressive failure at the stage of design." Dependability 20, no. 1 (March 30, 2020): 20–24. http://dx.doi.org/10.21683/1729-2646-2020-20-1-20-24.
Повний текст джерелаАнотація:
The stress that affects structures and their mechanical and geometrical parameters are random values. For that reason, the dependability of a construction facility (technical system) is generally evaluated in terms of the probability of no-failure over the estimated period of operation. The paper shows the feasibility of dependability analysis of building systems in the course of their design using logical and probabilistic methods, presents algorithms for regulating their dependability. It examines the feasibility of assuring the dependability of a construction project using the example of a double-span whole hinged beam. The paper also establishes the requirement of accounting for all possible destruction models of a building system. The dependability of a double-span whole hinged beam is estimated based on the probability of non-occurrence of all possible destruction models or one of a set of possible kinematic mechanisms. A kinematic mechanism forms a chain of plastic hinges or a chain of progressive failures of effective sections. In other words, the task of preventing progressive collapse comes down to ensuring the required dependability of both the building as a whole, and its individual members (effective sections) by adjusting qualitative and quantitative indicators of the dependability structure. The dependability of a member is understood as its ability to maintain internal force within the effective section at least as high as the external force. It is shown that correct design solutions, rational choice of materials and load non-exceedance probabilities enables specified dependability of a building system. In some cases that allows saving materials, in others enables lower probabilities of failure. Constructing the dependability structure of a technical system enables a quantitative estimation of the most hazardous design models of destruction, rational management of the choice of safety factors of load bearing members, redistribution of such safety factors, thus preventing progressive collapse. The introduced differential characteristics of the members’ “weight”, “significance”, “contribution” and “specific contribution” allows demonstrating the distribution of the roles of each member within the specified structure in terms of specific problems, including accounting for the possibility of progressive collapse. The study has shown that the removal of undependable vertical load bearing structures does not solve the problem of dependability of a construction project, including protection against progressive collapse. It has been established that the design of structures, including in terms of considerations of progressive failure, must involve constructing a system dependability structure using kinematic analysis, identifying the most important and significant members of such structure and – using special adjustment techniques – obtaining the required structure dependability. That will enable significant resource saving and reduction of costs associated with the development of construction operations.
44
Zacharaki, Angeliki, and Ioannis Kostavelis. "Dependability Levels on Autonomous Systems." International Journal of Information Systems for Crisis Response and Management 9, no. 3 (July 2017): 1–12. http://dx.doi.org/10.4018/ijiscram.2017070101.
Повний текст джерелаАнотація:
Professional robots should be endorsed with great autonomy capabilities when designed for release into the market. The need for autonomy is further reinforced when robots are meant to be used for crisis management situations, where close collaboration with humans and trustworthy operation in hazardous environments is necessary. To this end, this article quantifies the system's autonomy by measuring its dependability. This is achieved by defining a qualitative metric system regarding the different levels of dependability that autonomous systems should retain in order to operate in various crisis situations. It provides a detailed analysis of each level of dependability and proposes the minimum requirements that should be fulfilled in each level, thus realizing a ranking system that outlines the overall system's ability to operate autonomously. The proposed analysis is applied on a real robotic prototype developed for crisis situations and evaluates the system's autonomy capabilities by qualitative assessing the levels of dependability it retains.
45
Denisov, I. V., and A. A. Smirnov. "RESEARCH OF THE OPERATIONAL DEPENDABILITY OF THE LADA KALINA VEHICLE SYSTEMS AFFECTING TRAFFIC SAFETY." Dependability 17, no. 4 (November 22, 2017): 31–35. http://dx.doi.org/10.21683/1729-2646-2017-17-4-31-35.
Повний текст джерелаАнотація:
The growing number of cars in the Russian Federation means that a large number of vehicles with different performance indicators get involved in the transportation process. One of those indicators is dependability that is a key characteristic of quality. A vehicle’s operation is the primary test of its dependability, of which the indicators depend on the used design solutions and the manufacturing process. Defects occurring at various stages of vehicle manufacture significantly affect the dependability indicators. It must be noted that a vehicle is a source of increased hazard. A failure of a vehicle in operation due to a manufacturing defect or nonobservance of operation conditions may cause an accident. Therefore it is extremely important to have at one’s disposal information on the implemented systems reliability indicators that affect active safety. In this context, the research of automotive vehicles dependability in operation is a relevant scientific task, solving which will enable managing the technical condition of vehicles and ensure traffic safety.The aim of this research was to evaluate the operational dependability of the systems that directly affect the road safety of Lada Kalina with subsequent use of the obtained information in the development of automated systems for management of automotive vehicle technical condition in operation.The methods of research are based on the theoretical foundations of vehicle maintenance, the probability theory and mathematical statistics, experimental design theory. Standard methods of processing of statistical information on the operational dependability of vehicles were used. The data was obtained from official OAO AvtoVAZ dealerships in the Vladimir Oblast. As the result of research of the operational dependability of the systems that directly affect the road safety of Lada Kalina a list of defective components in the steering, braking, chassis, lighting and signalling systems was identified. Times to failure of parts, units and assemblies that limit the vehicle dependability, as well as the primary numerical characteristics of random distribution were determined. The defects identified at early stages of operation indicate design and manufacturing flaws of Lada Kalina.Conclusions: In this paper the authors present the findings regarding the defects of the Lada Kalina systems that directly affect traffic safety. This information was obtained by means of analyzing vehicle failures within the warranty period that were recorded based on the owners’ applications to the OAO AvtoVAZ dealerships an maintenance facilities in the Vladimir Oblast. Maintenance facilities, when performing diagnostic operations as part of routine maintenance, should take into consideration the list of the least dependable vehicle components given in this paper and directly affecting the traffic safety. The manufacturing factory should take note of the indicated defects and develop a plan of their elimination, as well as timely inform the consumers of the identified warranty-specific defects and recall the products.
46
Pokhabov, Yu P. "Design engineering approach to ensuring specified dependability. Case study of unique, highly critical systems with short operation life." Dependability 22, no. 1 (March 25, 2022): 20–29. http://dx.doi.org/10.21683/1729-2646-2022-22-1-20-29.
Повний текст джерелаАнотація:
Aim. To examine the design engineering approach to ensuring specified dependability on the basis of engineering disciplines and design engineering methods of quality and dependability assurance using the case of unique, highly critical products with short operation life. Such approach, unlike the statistical procedures of modern dependability, allows associating the dependability indicator calculations with the calculated operability parameters and established design criteria that are to be met in order to confirm the specified dependability indicators for products with an indefinite number of critical elements, each of which operates according to a functional principle that is different in its nature. Methods. The paper examined the prerequisites for the implementation of the design engineering approach to dependability, such as the distinctive features of ensuring the dependability of unique, highly critical products with short operation life, the applicability of design engineering approach to dependability, the effect of the genesis on the assurance of design engineering dependability, behavioural models of technical products in terms of dependability and specifics of highly critical product calculation. It was identified that, for items with high specified probability of no failure exceeding three-sigma random value variation interval, dependability is to be calculated not by identifying the dependability function, but rather by proving that undependability function is below the acceptable value, which ultimately ensures the specified dependability. Such approach enables the development of methods of early failure prevention using procedures of design engineering analysis of dependability for the purpose of achieving the required parameters of functionality, operability and dependability of products on the basis of a generalised parametric functional model. Results. The design engineering analysis of dependability allows substantiating the criteria for error-free design (selection of sound principles of operability and validation of engineering solutions for achieving the required dependability indicators). The effect of the error-free engineering criteria combined with the criteria for defect-free engineering (observance of the generally accepted principles, rules, requirements, norms and standards of drawing generation) and defect-free manufacture (strict adherence to the requirements of drawings with no deviation permits) enables a designer to achieve the specified dependability values without using the statistical methods of the modern dependability theory. Conclusion. Dependability as a comprehensive property is characterised by a probability that, on the one hand, determines the rate of possible failures, and, on the other hand, indicates the number of errors that were made by engineers during the design, manufacture and operation of products and can lead to failures. Additionally, the failure rate is determined by the engineers’ efforts to eliminate or mitigate the consequences of possible failures at each life cycle stage. The greater and earlier are such efforts adopted, the higher the product’s dependability will be. Ultimately, dependability is determined by consistent and rigorous implementation of error-free design, defect-free design and defect-free manufacture procedures whose efficiency is in no way associated with the number of manufactured products. Their efficiency and effectiveness are determined by specific decisions and actions by the engineers who make sure that the product performs the required functions with the specified dependability in the established modes and conditions of operation. Ensuring that only takes using engineering disciplines, as well as design engineering methods for quality and dependability assurance.
47
Shubinsky, I. S., A. M. Zamyshliaev, and L. P. Papi. "Adaptive dependability of information management systems." Dependability 18, no. 4 (December 5, 2018): 3–9. http://dx.doi.org/10.21683/1729-2646-2018-18-4-3-9.
Повний текст джерелаАнотація:
The paper examines the reliability of an information management system as its ability to provide the required services that can be justifiably trusted. It is assumed that the system functions without an operator. The aim is to ensure the dependability of a multimodule control system, when the problem-solving results are affected by failures, faults and errors of problem-solution by the system’s computation modules (CMs). Conventional fault tolerance methods do not provide the desired effect, as even under infinite structural redundancy yet real capabilities of on-line detection of CM failures or faults the system’s dependability is significantly lower than expected. The paper proposes and evaluates the methods of adaptive dependability. They are to ensure the observability of control systems under limited capabilities of component CM operability supervision, as well as achieving the required levels of dependability of information management systems in cases of insignificant float time and structural redundancy. These goals are achieved through active (and automatic) reassignment of the available computational resources for on-line information processing. The methods of adaptive dependability enable – with no interruption of computational processes and while solving real-world problems – timely automatic detection and elimination of failures, faults of CMs and errors in the solution of specified problems through on-line localization of faulty modules and subsequent automatic reconfiguration of the system with the elimination of such modules from operation.
48
ANCEAUME, EMMANUELLE, FRANCISCO BRASILEIRO, ROMARIC LUDINARD, BRUNO SERICOLA, and FRÉDÉRIC TRONEL. "DEPENDABILITY EVALUATION OF CLUSTER-BASED DISTRIBUTED SYSTEMS." International Journal of Foundations of Computer Science 22, no. 05 (August 2011): 1123–42. http://dx.doi.org/10.1142/s0129054111008593.
Повний текст джерелаАнотація:
Awerbuch and Scheideler have shown that peer-to-peer overlay networks can survive Byzantine attacks only if malicious nodes are not able to predict what will be the topology of the network for a given sequence of join and leave operations. In this paper we investigate adversarial strategies by following specific protocols. Our analysis demonstrates first that an adversary can very quickly subvert overlays based on distributed hash tables by simply never triggering leave operations. We then show that when all nodes (honest and malicious ones) are imposed on a limited lifetime, the system eventually reaches a stationary regime where the ratio of polluted clusters is bounded, independently from the initial amount of corruption in the system.
49
Belousova, M. V., V. V. Bulatov, and N. V. Smirnov. "Estimation of the failure flow of a set of passenger car doors." Dependability 21, no. 3 (September 21, 2021): 20–26. http://dx.doi.org/10.21683/1729-2646-2021-21-3-20-26.
Повний текст джерелаАнотація:
An estimation of the failure flows is a prerequisite for the operation of industrial products. It is based on statistical data about failures that occur within technical items in the process of their operation. In the technical product documentation, this indicator shall be featured in the “Dependability parameter estimation” section. The dependability analysis of rolling stock is still affected by the difficulty of defining the methodology for evaluating this parameter at various system levels. For the purpose of analysing a multicomponent system, a reliability block diagram should be developed, and the possible replacement (redundant) elements should be taken into consideration. Multicomponent systems are often represented through various block diagrams, where, among others, the “m-out-of-n” structure may be used referring to a system with a parallel arrangement of elements that is operable when at least m elements operate. An example of such system is a set of passenger car doors. The manufacturers and customers may have different approaches to calculating technical system dependability. First, the required dependability indicator for the entire train is defined that, in turn, defines the dependability requirements for a car. At the same time, the dependability indicator for a car is determined by the respective values of its components (subsystems, units and parts). However, the nature of the relationship between a car and its components is not always taken into account. At the same time, car manufacturers can and should define in the regulatory documentation (and later supervise in operation) the dependability indicators for a set of doors (components of a car in our case) as a single system. However, the failure criteria of a set of doors are not always defined. This paper examines the method of calculating the failure flow for a set of passenger car doors based on operational data and the failure flow of a single door. Aim. To propose a method for calculating the failure flow of a set of 6 car doors by analysing the possible reliability block diagrams with subsequent transition to transition and state graphs.Conclusions. A number of block diagrams were developed for the purpose of dependability calculation of sets of passenger car doors based on the system failure criterion. The failure flow of a set of car doors was calculated according to the developed block diagrams. It is concluded that the Markovian method of calculating the failure flow is of higher priority than the logic-and-probability approach, since it takes into account the recovery factor. A Markovian method was proposed for calculating the failure flow and recovery time of a set of car doors for the “3-out-of-4” reliability block diagram.
50
Klöpper, Benjamin, Christoph Sondermann-Wölke, and Christoph Romaus. "Probabilistic Planning for Predictive Condition Monitoring and Adaptation Within the Self-Optimizing Energy Management of an Autonomous Railway Vehicle." Journal of Robotics and Mechatronics 24, no. 1 (February 20, 2012): 5–15. http://dx.doi.org/10.20965/jrm.2012.p0005.
Повний текст джерелаАнотація:
Self-optimizing mechatronic systems are a new class of technical systems. On the one hand, new challenges regarding dependability arise from their additional complexity and adaptivity. On the other hand, their abilities enable new concepts and methods to improve the dependability of mechatronic systems. This paper introduces a multi-level dependability concept for selfoptimizing mechatronic systems and shows how probabilistic planning can be used to improve the availability and reliability of systems in the operating phase. The general idea to improve the availability of autonomous systems by applying probabilistic planning methods to avoid energy shortages is exemplified on the example of an innovative railway vehicle.