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检索条件"主题词=Software Algorithms"

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Preventing Frequency Instability Using Large-Scale Photovoltaic Resources

Preventing Frequency Instability Using Large-Scale Photovolt...

引用

Technology and Energy Management (ICTEM), International Conference on

作者： Siavash Yari Hamid Khoshkhoo Kumars Rouzbehi S. M. Ale Emran Faculty of Electrical Engineering Sahand University of Technology Sahand Iran Department of System Engineering and Automatic Control University of Seville Seville Spain Faculty of Engineering University of Quebec at Chicoutimi (UQAC)

Various control methods have been presented to prevent the occurrence of instability in power systems, among which, it seems that methods based on the special protection system (SPS) are more effective and efficient than other ones. In this article, a SPS using the capabilities of large-scale photovoltaic power plants (LSPVPPs) is presented to prevent frequency increase and instability in power systems. According to the presented algorithm, when frequency increases, the proposed SPS uses the ability of photovoltaic power plants to quickly change their generation powers based on the operating point and frequency changes to prevent frequency instability. To confirm the proposal, LSPVPPs along with their controllers are modeled in the DSL environment of DIgSILENT PowerFactory software. The proposed SPS is implemented and tested on the IEEE 39-bus test system and the results of dynamic simulations show that this SPS prevents frequency instability in different conditions by taking timely measures.

关键词： Photovoltaic systems Time-frequency analysis Power system dynamics software algorithms Power system stability Stability analysis software

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Investigating Context Adaptation Bugs in Code Clones

Investigating Context Adaptation Bugs in Code Clones

引用

International Conference on software Maintenance (ICSM)

作者： Manishankar Mondal Banani Roy Chanchal K. Roy Kevin A. Schneider University of Saskatchewan Saskatoon SK Canada

The identical or nearly similar code fragments in a code-base are called code clones. There is a common belief that code cloning (copy/pasting code fragments) can introduce bugs in a software system if the copied code fragments are not properly adapted to their contexts (i.e., surrounding code). However, none of the existing studies have investigated whether such bugs are really present in code clones. We denote these bugs as Context Adaptation Bugs, or simply Context-Bugs, in our paper and investigate the extent to which they can be present in code clones. We define and automatically analyze two clone evolutionary patterns that indicate fixing of Context-Bugs. According to our analysis on thousands of revisions of six open-source subject systems written in Java, C, and C#, code cloning often introduces Context-Bugs in software systems. Around 50% of the clone related bug-fixes can occur for fixing Context-Bugs. Cloning (copy/pasting) a newly created code fragment (i.e., a code fragment that was not added in a former revision) is more likely to introduce Context-Bugs compared to cloning a preexisting fragment (i.e., a code fragment that was added in a former revision). Moreover, cloning across different files appears to have a significantly higher tendency of introducing Context-Bugs compared to cloning within the same file. Finally, Type 3 clones (gapped clones) have the highest tendency of containing Context-Bugs among the three major clone-types. Our findings can be important for early detection as well as removal of Context-Bugs in code clones.

关键词： Cloning Computer bugs software systems software maintenance Tools software algorithms

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A New Frame Size Adjusting Method for Framed Slotted Aloha Algorithm

A New Frame Size Adjusting Method for Framed Slotted Aloha A...

引用

IEEE International Conference on e-Business Engineering (ICEBE)

作者： Cuicui Yu Feng Zhou Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing China

In this paper, a new frame size adjusting method is proposed for framed slotted ALOHA algorithm in RFID system. This method does not predict the number of tags. The reader just use the current frame size and the total number of successful slots, idle slots and collision slots in current frame to select a more appropriate frame size to continue the inventory of tags in a new frame. The proposed adjusting method can be easily carried out, and simulation results show that the proposed algorithm consumes fewer time slots as compared to previous work.

关键词： Radiofrequency identification Counting circuits software algorithms Computer science Laboratories Multimedia systems Computational modeling Electronic mail Design methodology Sleep

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ANFIS MPPT Assisted PV Fed DC-DC Switched Z Source Converter For Microgrid Applications

ANFIS MPPT Assisted PV Fed DC-DC Switched Z Source Converter...

引用

International Conference on Circuit, Power and Computing Technologies (ICCPCT)

作者： V. P. Karthika Preethy R. Tharwin Kumar P. Radhika Ananthan Nagarajan A. A. Mohamed Faizal M. Sasikumar Department of Electrical and Electronics Engineering Amrita College of Engineering and Technology Nagercoil Tamil Nadu India Department of Electrical and Electronics Engineering Puducherry Technological University Puducherry India Department of Electrical and Electronics Engineering Mallareddy Engineering College for Women Hyderabad India Department of Electrical and Electronics Engineering Vel Tech Multi Tech Dr Rangarajan Dr Sakunthala Engineering College Chennai India Department of Electrical and Electronics Engineering Engineering Faculty V V College of Engineering Tamil Nadu India Department of Electrical and Electronics Engineering C. Abdul Hakeem College of Engineering & Technology India

ISBN: (数字)9798350372816

ISBN: (纸本)9798350372823

Photovoltaic (PV) modules are crucial components of contemporary distribution networks, but they have historically been employed primarily to provide profitable, clean, and green energy. An Adaptive Neuro Fuzzy Inference System (ANFIS) is described in this study as a technique for MPP prediction using information on solar interaction and ambient temperature. The proposed technique has the benefits of a quick reaction, overall harmonic distortion discount, more effective utilization of PV units, and straightforward ANFIS algorithm training. An innovative type of large step up DC to DC converter is produced by combining the switched-capacitor cells by a conventional Z-source impedance network. The recommended converter delivers a great voltage gain lacking the limited accountability sequence and does not necessitate an enormous quantity of modules while decreasing a voltage heaviness on the diodes and the control switch to fewer than partial the productivity power. The performance and application of the recommended converter are established by the simulation and experimental findings. The comparison of the controllers shows the superior MPPT effectiveness of ANFIS as 92.3%.

关键词： Training Productivity Photovoltaic systems software algorithms Switches Microgrids Prediction algorithms

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Indoor localization using received signal strength

Indoor localization using received signal strength

引用

International Design and Test Workshop

作者： H A Obeidat R A Abd-Alhameed J M Noras S. Zhu T Ghazaany N. T. Ali E. Elkhazmi Design and Technology University of Bradford UK Khalifa University Sharjah UAE The higher institute of electronics bani walid Libya

A comparison between two indoor localization algorithms using received signal strength is carried out. The first algorithm is the vector algorithm; the second is the matrix algorithm. The comparison considered the effects of the reference points, the access point, and the frequency on the accuracy of the localization process. The experiments were carried out using ray tracing software and MATLAB. This paper justifies the use of adopting the matrix algorithm.

关键词： Vectors Databases Accuracy Radio transmitters Euclidean distance Matrix converters software algorithms

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Towards a universal client for grid monitoring systems: design and implementation of the Ovid browser 06

Towards a universal client for grid monitoring systems: desi...

引用

International Symposium on Parallel and Distributed Processing (IPDPS)

作者： M.D. Dikaiakos A. Artemiou G. Tsouloupas Department of Computer Science University of Cyprus Nicosia Cyprus

ISBN: (纸本)9781424400546

In this paper, we present the design and implementation of Ovid, a browser for grid-related information. The key goal of Ovid is to support the seamless navigation of users in the grid information space. Key aspects of Ovid are: (i) a set of navigational primitives, which are designed to cope with problems such as network disorientation and information overloading; (ii) a small set of Ovid views, which present the end-user with high-level, visual abstractions of grid information; these abstractions correspond to simple models that capture essential aspects of a grid infrastructure; (iii) support for embedding and implementing hyperlinks that connect related entities represented within different information views; (iv) a plug-in mechanism, which enables the seamless integration with Ovid of third-party software that retrieves and displays data from various grid information sources; and (v) a modular software design, which allows the easy integration of different visualization algorithms that support the graphical representation of large amounts of grid-related information in the context of Ovid's views

关键词： Monitoring Navigation Algorithm design and analysis Context modeling Embedded software Information retrieval Displays software design Data visualization software algorithms

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Tamper-proof Election Result Verification System in Resource Constrained Environments

Tamper-proof Election Result Verification System in Resource...

引用

International Conference on Computing and Network Communications (CoCoNet)

作者： Achmad Rully Hidenori Nakazato Graduate School of Global Information and Telecommunication Studies Waseda University Tokyo Japan Dept. of Communications and Computer Engineering Waseda University Tokyo Japan

As an indispensable tool in democracy, election need to be secure and verifiable even in a resource constrain environment, to overcome demography, multicultural and others social challenges. This paper proposes a new election verification system by verifying tally result from each poll station, even in a resource constrain environment, that can conclude a faster and accountable final election result. Through multiple analysis we conclude the proposed system usefulness.

关键词： Voting Servers Robustness Manuals Encryption software algorithms

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Validation & Verification of Intelligent and Adaptive Control Systems

Validation & Verification of Intelligent and Adaptive Contro...

引用

IEEE Conference on Aerospace

作者： G.S. Tallant P. Bose J.M. Buffington V.W. Crum R.A. Hull T. Johnson B. Krogh R. Prasanth Lockheed Martin Aeronautics Company Fort Worth TX USA Lockheed Martin Missiles and Fire Control Orlando FL USA Lockheed Martin Missiles and Space Sunnyvale CA USA Carnegie Mellon University Pittsburgh PA USA Air Force Research Laboratory OH USA Scientific Systems Company Inc. Woburn MA USA

Emerging military aerospace system operational goals, such as autonomy, will require advanced safety-critical control systems consisting of unconventional requirements, system architectures, software algorithms, and hardware implementations. These emerging control systems will significantly challenge current verification and validation (V&V) processes, tools, and methods for flight certification. Ultimately, transition of advanced control systems that enable transformational military operations will be decided by affordable V&V strategies that reduce costs and compress schedules for flight certification. This paper describes a comprehensive plan and preliminary results for a study of V&V needs for emerging safety-critical control systems in the context of military aerospace vehicle flight certification

关键词： Intelligent control Adaptive control Control systems Certification Aerospace control Aerospace safety Computer architecture software safety software systems software algorithms

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Security Authentication Scheme for Low Earth Orbit Satellites Based on Spatial Channel Characteristics

Security Authentication Scheme for Low Earth Orbit Satellite...

引用

International Conference on Computer and Communications (ICCC)

作者： Li Rui Jun Liu Miaoxia Lu College of Information Science and Engineering Nanjing Audit University Jinshen College Nanjing China

Security authentication can effectively solve the problem of access to Low Earth Orbit (LEO) satellites. However, the existing solutions still harbor some problems in the computational complexity of satellite authentication, flexible networking, resistance to brute force attacks and other aspects. So, a security authentication scheme for LEO satellites that integrates spatial channel characteristics is designed within the software defined network architecture. In this scheme, the spatial channel characteristics are introduced to the subsequent lightweight encryption algorithm to achieve effective defense against brute force attacks. According to security analysis and simulation results, the scheme can effectively reduce the computational overhead while protecting against replay attacks, brute force attacks, DOS attacks, and other known attacks.

关键词： Resistance Satellites Simulation Force software algorithms Low earth orbit satellites Authentication

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Identifying the split personality of the malicious host in the mobile agent environment

Identifying the split personality of the malicious host in t...

引用

International IEEE Conference on Intelligent Systems, IS

作者： S. Venkatesan C. Chellappan Department of CSE Anna University Chennai India

Mobile agents are software programs capable of working autonomously and automatically. Mobile agents in the network will be the problem for the remote host if it is a malicious agent and also problem to the agent while it visits the malicious host. In this paper, we propose a model for identifying the split personality of the malicious hosts (machine attacks the agent) using the hash function comparison. Identifying the attack is better than the protection because it will identify the attacker is to remove from the environment.

关键词： Mobile agents Protection Intelligent agent Costs Intelligent systems Intelligent networks software algorithms Cryptography Delay Electronic mail

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