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共 8688 条记录，以下是4911-4920 订阅

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Design and Application of a Centralized Monitoring System for VRLA Based on Electric Power Telecommunication Network

Design and Application of a Centralized Monitoring System fo...

引用

IEEE PES asia-pacific Power and Energy engineering conference (APPEEC)

作者： Hui Bao Yanyan Qi Shaoqin Han College of Electrical and Electronic Engineering North China Electric Power University Baoding Hebei China

In this paper, a centralized and networked monitoring system for Valve-Regulated Lead-Acid Batteries (VRLA) based on electric power telecommunication network is introduced, detailed structure and software design are presented as well. The system transfers data and commands via the electric power telecommunication network, it is able to perform many critical functions for VRLA such as real-time monitoring, intellectual diagnosis, capacity evaluation, automatic SMS alerts on faults, remote maintenance operations and so on. The system has been installed in some power supply corporations in the country and works fine.

关键词： Substations Batteries Communication system control Computerized monitoring Remote monitoring Optical fibers Databases Power generation Telecommunication control Joining processes

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Strategies for Improving MDA-Based Development Processes

Strategies for Improving MDA-Based Development Processes

引用

UKSim/AMSS 1st International conference on Intelligent Systems, Modelling and Simulation

作者： Gholami, Mehdi Fahmideh Ramsin, Raman Islamic Azad Univ Dept Comp Engn Sci & Res Branch Tehran Iran Sharif Univ Technol Dept Comp Engn Tehran Iran

ISBN: (纸本)9781424459841

The Model Driven Architecture (MDA) is meant to facilitate system development by using models for representing both the "problem" and its "solution". In its ideal form, software development based on MDA would follow a development process that begins by producing models of the problem domain at a high level of abstraction, and then proceeds by gradually and automatically transforming them into executable code with the help of tools. However, MDA-based development has encountered several setbacks, the mitigation of which requires detailed scrutiny and analysis. In this research, MDA-based development is analyzed through applying SWOT (Strengths, Weaknesses, Opportunities, and Threats) analysis in order to identify the problems afflicting MDA. The analysis also offers strategies for addressing these problems by utilizing MDA's own strengths, and also by using the potential solutions offered by other approaches and technologies. This knowledge will allow developers and method engineers to address the shortcomings of MDA-based development tools and techniques.

关键词： Model-Driven Architecture (MDA) Model-Driven engineering (MDE) SWOT Analysis

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An Interaction-Pattern-Based Approach to Prevent Performance Degradation of Fault Detection in Service Robot software

An Interaction-Pattern-Based Approach to Prevent Performance...

引用

asia-pacific conference on software engineering

作者： Seung-Yeol Seo Hyung-Min Koo In-Young Ko Korea Advanced Institute of Science and Technology Daejeon South Korea

In component-based robot software, it is crucial to monitor software faults and deal with them on time before they lead to critical failures. The main causes of software failures include limited resources, component-interoperation mismatches, and internal errors of components. Message-sniffing is one of the popular methods to monitor black-box components and handle these types of faults during runtime. However, this method normally causes some performance problems of the target software system because the fault monitoring and detection process consumes a significant amount of resources of the target system. There are three types of overheads that cause the performance degradation problems: frequent monitoring, transmission of a large amount of monitoring-data, and the processing time for fault analysis. In this paper, we propose an interaction-pattern-based approach to reduce the performance degradation caused by fault monitoring and detection in component-based service robot software. The core idea of this approach is to minimize the number of messages to monitor and analyze in detecting faults. Message exchanges are formalized as interaction patterns which are commonly observed in robot software. In addition, important messages that need to be monitored are identified in each of the interaction patterns. An automatic interaction pattern-identification method is also developed. To prove the effectiveness of our approach, we have conducted a performance simulation. We are also currently applying our approach to silver-care robot systems.

关键词： Monitoring Fault detection software Degradation Robots Runtime Speech recognition

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Simulation Based Multi-experts Evaluation Method for Human-machine Interface Design of Main Control Room

Simulation Based Multi-experts Evaluation Method for Human-m...

引用

IEEE PES asia-pacific Power and Energy engineering conference (APPEEC)

作者： Shengyuan Yan Kun Yu Zhijian Zhang Minjun Peng College of Mechanical and Electrical Engineering Harbin Engineering of Technology Harbin China College of Mechanical and Electrical Engineering Harbin Engineering University Harbin China College of Nuclear Science and Technology Harbin Engineering of Technology Harbin China College of Nuclear Science and Technology Harbin Engineering University Harbin China

Human-machine interface (HMI) design of the main control room (MCR) can obviously affect efficiency, safety operation and control of modern power plants system. A simulation based multi-experts evaluation method for HMI design of MCR was proposed. The functional simulation models of MCR HMI have been developed based on GL Studio. Modularization thinking was used to enhance the modeling efficiency. The evaluation indexes system of MCR HMI was determined, and the bottom evaluation indexes were extracted from the related ergonomic standards. Fuzzy theory was applied to integrate of evaluation comments of multi-experts in the multiexperts evaluation method. Finally, the evaluation software for MCR HMI was developed. The evaluation indexes system, evaluation method, and functional simulation models have been integrated into the software. The mentioned method is expected to enhance the HMI design quality of MCR of power plants.

关键词： Man machine systems Power generation Instruments Power system modeling Educational institutions Design engineering Power engineering and energy Nuclear power generation Electrical safety Design methodology

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Detecting Duplicate Bug Report Using Character N-Gram-Based Features

Detecting Duplicate Bug Report Using Character N-Gram-Based ...

引用

asia-pacific conference on software engineering

作者： Ashish Sureka Pankaj Jalote Indraprastha Institute of Information Technology New Delhi India

We present an approach to identify duplicate bug reports expressed in free-form text. Duplicate reports needs to be identified to avoid a situation where duplicate reports get assigned to multiple developers. Also, duplicate reports can contain complementary information which can be useful for bug fixing. Automatic identification of duplicate reports (from thousands of existing reports in a bug repository) can increase the productivity of a Triager by reducing the amount of time a Triager spends in searching for duplicate bug reports of any incoming report. The proposed method uses character N-gram-based model for the task of duplicate bug report detection. Previous approaches are word-based whereas this study investigates the usefulness of low-level features based on characters which have certain inherent advantages (such as natural-language independence, robustness towards noisy data and effective handling of domain specific term variations) over word-based features for the problem of duplicate bug report detection. The proposed solution is evaluated on a publicly-available dataset consisting of more than 200 thousand bug reports from the open-source Eclipse project. The dataset consists of ground-truth (pre-annotated dataset having bug reports tagged as duplicate by the Triager). Empirical results and evaluation metrics quantifying retrieval performance indicate that the approach is effective.

关键词： Feature extraction Semantics software Java Computer bugs software engineering Data mining

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Forming Mechanical Model of the Finite Strip in Cold-Formed Steel Based on Multi-Intelligence Agents

Forming Mechanical Model of the Finite Strip in Cold-Formed ...

引用

IEEE PES asia-pacific Power and Energy engineering conference (APPEEC)

作者： Jun-cai Zhang Qing-guo Chen College of Mechanical and Electronic Engineering Heibei University of Science and Technology Shijiazhuang Hebei China

To achieve the complex forming in open cross-section steel, this thesis established a mechanical model with spline finite strip method based on deformation characteristics of non-uniform division of spline finite strip. It determined the spline area and tie line rationally, simplifies boundary condition in designing pass structure. Aiming at the the impact of qualitative factors shaping which are difficult to quantify, according to specialist experience, theory system of Multi-Agent was established by amending the Agent of knowledge containers and social relationships. This work can provide theoretical guidance for complex design of steel in pass section.

关键词： Strips Steel Spline Deformable models Boundary conditions Road transportation Compressive stress Tensile stress Educational institutions Containers

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6.8–10 GHz frequency synthesizer for software-defined-radio

6.8–10 GHz frequency synthesizer for software-defined-radio

引用

asia-pacific conference on Microwave

作者： Hsiao-Chin Chen Shey-Shi Lu Department of Electrical Engineering National Taiwan University of Science and Technology Taipei Taiwan Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)9784902339222

A 6.8-10 GHz fractional-N frequency synthesizer for the software-defined-radio is presented in 90-nm CMOS technology. Differentially tuned varactors are employed to achieve a VCO with a wide tuning range and low phase noise. The charge pump current is varied to optimize the loop bandwidth over the entire VCO tuning range from 6.8 GHz to 10 GHz. The power dissipation of the synthesizer chip is 59 mW. The synthesizer achieves the close-in phase noise of -91 dBc/Hz and the reference spur of -68 dBc at the integer-N mode. The synthesizer can settle to the desired frequency within 10~11 us in each application band while offering a frequency resolution of 3 Hz.

关键词： Frequency synthesizers Voltage-controlled oscillators Synthesizers Phase noise Tuning CMOS integrated circuits Charge pumps

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Research on MATLAB Simulation of Three Level Power Amplifier for Magnetic Bearing

Research on MATLAB Simulation of Three Level Power Amplifier...

引用

IEEE PES asia-pacific Power and Energy engineering conference (APPEEC)

作者： Wentao Yu Youpeng Fan Shuqin Liu Deguang Li Magnetic Suspension Technology Laboratory Shandong University Jinan China

For FPGA-based three level switching power amplifier, this paper completed full-bridge circuit model and the current sampling circuit model was created by using Power System Blockset (PSB) library in the MATALB/Simulink. Through embedded MATLAB function file, we simulated the internal FPGA data processing. Simulation and experimental results verified the correctness of this method of modeling. And this provided a new accurate method of simulation for digital power amplifier.

关键词： MATLAB Power amplifiers Magnetic levitation Power system simulation Circuit simulation Power system modeling Mathematical model Switching circuits Sampling methods software libraries

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Numerical Investigation on the Interaction between the Volume and Diffuser with Different Outlet Angles in Nuclear Main Pump

Numerical Investigation on the Interaction between the Volum...

引用

IEEE PES asia-pacific Power and Energy engineering conference (APPEEC)

作者： Liang Li Xiao-fang Wang Shuo Yin Rong Xie Yu-jiao Shan School of Energy & Power Engineering Dalian University of Technology Dalian China

In this study, the numerical investigation on the interaction between the volume and the diffuser with different outlet angles in the nuclear main pump was conducted by using the commercial software NUMECA. It was found that the static pressure increases gradually from the diffuser outlet to the volume wall with the maximum value presenting near the volume wall. The back flow at the volume outlet results in a significant flow loss, which is the main reason for the low efficiency of the nuclear main pump. Moreover, the pump head and efficiency increases with decreasing the outlet installation angle of the diffuser. However, it is important to be noticed that the growth rate become increasingly small with a little decrease of the pump head when increasing the outlet angle to 20° , which means 20° should be the optimal angle for installing the diffuser outlet.

关键词： Mesh generation Inductors Impellers Coolants Temperature Blades Water heating Nuclear power generation Power engineering Numerical simulation

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Voltage Regulation of Grid Connected Wind Farm Using STATCOM

Voltage Regulation of Grid Connected Wind Farm Using STATCOM

引用

IEEE PES asia-pacific Power and Energy engineering conference (APPEEC)

作者： Mohammad Ali Tofigh Nasrudin Abd Rahim R. Vigna Kumaran Department of Electrical Engineering University of Malaya Kuala Lumpur Malaysia Department of Electrical Engineering University Tenaga Nasional Serdang Malaysia

This paper presents analysis of voltage regulation by using STATCOM to reduce voltage fluctuation in the grid connected wind farms. A STATCOM is installed at the main bus of power system network, point of common coupling, (PCC), which wind turbine generator systems (WTGS) or wind farm is connected to the power system. STATCOM technology is shown to mitigate voltage fluctuation and to improve power quality in the power system. This research concludes with the discussion of voltage regulation analysis and wind farm problem in power system network. In this research, PSCAD/EMTDC software is used to model and simulate the network.

关键词： Voltage control Wind farms Automatic voltage control PSCAD Power system analysis computing Power system modeling Power system simulation Voltage fluctuations Wind turbines Power generation

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