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Modular simulators match cost and performance criteria

IEEE COMPUTER APPLICATIONS IN POWER 1996年第2期9卷 36-41页

作者： Kezunovic, M Texas A and M University Test Laboratories International Inc. USA

Digital power system simulators for protective relay testing were introduced as a concept in the late 1970s with the first designs made available in the early 1980s. Since that time, a variety of digital simulator solutions have been implemented and used by utilities, universities, and relay vendors. It is interesting to note that all of the designs had quite different implementation approaches and performance characteristics. This article features a new concept for a modular digital simulator design in which a variety of hardware and software modules have been developed and used to configure different simulator solutions. The author describes how modular digital simulator configurations range from low-cost single-user, to multiuser environments for open-loop testing and real-time application.

关键词： digital simulator loop test simulator real-time application program relay test Modularity Computer hardware software module Relay protection single user performance characteristics

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OPTIMAL ALLOCATION AND CONTROL-PROBLEMS FOR software-TESTING RESOURCES

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IEEE TRANSACTIONS ON RELIABILITY 1990年第2期39卷 171-176页

作者： OHTERA, H YAMADA, S HIROSHIMA UNIV FAC ENGNDEPT IND & SYST ENGNHIROSHIMA 724JAPAN

Two kinds of software-testing management problems are considered: testing-resource allocation to best use specified testing resources during module testing, and a testing-resource control problem concerning how to spend the allocated amount of testing-resource expenditures during it. A software reliability growth model based on a nonhomogeneous Poisson process is introduced. The model describes the time-dependent behavior of software errors detected and testing-resource expenditures spent during the testing. The optimal allocation and control of testing resources among software modules can improve reliability and shorten the testing stage. Based on the model, numerical examples of these two software testing management problems are presented.

关键词： optimal allocation software module Standing Orders Poisson process

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Concurrent Composition Using Loci

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COMPUTING IN SCIENCE & ENGINEERING 2009年第3期11卷 27-35页

作者： Zhang, Yang Luke, Edward Mississippi State Univ Computat Simulat & Design Ctr Mississippi State MS 39762 USA Mississippi State Univ Dept Comp Sci & Engn Mississippi State MS USA

A new software framework called Loci provides an automatic system for generating the communication and synchronization required to correctly compose software modules. This results in a much cleaner software architectu... 详细信息

关键词： software Frameworks software architecture Cleaners automation system software module

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Measuring the evolutionary stability of software systems: case studies of Linux and FreeBSD

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IET software 2009年第1期3卷 26-36页

作者： Yu, L. Ramaswamy, S. Indiana Univ S Bend Dept Comp & Informat Sci South Bend IN 46634 USA Univ Arkansas Dept Comp Sci Little Rock AR 72204 USA

In software evolution, stability is defined as the ability of a module to remain largely unchanged when faced with newer requirements and/or changes in the environment. Although stability is an important long-term design characteristic for hardware systems, it has not been studied deeply for software systems. Stability is directly related to software evolvability and maintainability;and it affects the software evolution process. A model based on software version differences is presented to measure the evolutionary stability of software modules. This model represents and normalises two distances: the source code and the structure distances, between two versions of an evolving software module. As a case study based on this model, the evolutionary stability of Linux and FreeBSD modules is compared. The results of the study shows that the evolutionary stability of a software module in Linux and FreeBSD depends more on its function type and less on the system environment.

关键词： Linux Hardware system Evolutionary Maintainability software systems Unix operating system software module software evolution Source code

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Linear diffraction grating interferometer with high alignment tolerance and high accuracy

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APPLIED OPTICS 2011年第22期50卷 4550-4556页

作者： Cheng, Fang Fan, Kuang-Chao Hefei Univ Technol Sch Instrument Sci & Optoelect Engn Hefei 230009 Anhui Peoples R China Nanyang Technol Univ Sch Mech & Aerosp Engn Singapore 639798 Singapore Natl Taiwan Univ Dept Mech Engn Taipei 10617 Taiwan

We present an innovative structure of a linear diffraction grating interferometer as a long stroke and nanometer resolution displacement sensor for any linear stage. The principle of this diffractive interferometer is based on the phase information encoded by the +/- 1st order beams diffracted by a holographic grating. Properly interfering these two beams leads to modulation similar to a Doppler frequency shift that can be translated to displacement measurements via phase decoding. A self-compensation structure is developed to improve the alignment tolerance. LightTool analysis shows that this new structure is completely immune to alignment errors of offset, standoff, yaw, and roll. The tolerance of the pitch is also acceptable for most installation conditions. In order to compact the structure and improve the signal quality, a new optical bonding technology by mechanical fixture is presented so that the miniature optics can be permanently bonded together without an air gap in between. For the output waveform signals, a software module is developed for fast real-time pulse counting and phase subdivision. A laser interferometer HP5529A is employed to test the repeatability of the whole system. Experimental data show that within 15 mm travel length, the repeatability is within 15 nm. (c) 2011 Optical Society of America

关键词： interferometers Diffraction gratings Doppler frequency Signal quality software module Repeatability alignment error Linear AIR GAP Phase DISPLACEMENT MEASUREMENT

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Implementation of draft-angle, mould-machining capabilities in an automated CAD/CAM pipeline

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INTERNATIONAL JOURNAL OF COMPUTER INTEGRATED MANUFACTURING 2005年第1期18卷 1-14页

作者： Kumaresan, P Wright, PK Univ Calif Berkeley Dept Mech Engn Berkeley Mfg Inst Berkeley CA 94720 USA

This research presents algorithms and software modules that have been developed for automating the machining of mould halves in a computer numerically controlled (CNC) milling machine. The new contribution of this paper is the software that recognizes 'drafted features' and automatically selects appropriate tools from a tool database to generate tool paths and respective G&M codes for machining these features. Another specific new aspect presented in this paper is that the software enables mould designers to provide multiple angle drafts in their designs. The various modules have been successfully integrated within an existing 2.5D CAD/CAM pipeline. Finally, test parts were designed and successfully machined using the NC codes thus generated.

关键词： CAD/CAM computer software machining software module Automation pipeline Numerical controls Machining lines

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Implementation of an ESA delta-DOR capability

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ACTA ASTRONAUTICA 2009年第11-12期64卷 1041-1049页

作者： James, Nick Abello, Ricard Lanucara, Marco Mercolino, Mattia Madde, Roberto European Space Agcy ESOC Darmstadt Germany

This paper describes the implementation of delta-DOR (delta-differential one-way ranging) receivers within the ESA Deep Space ground station network. Delta-DOR provides very accurate plane-of-sky measurements of spacecraft position which complement existing line-of-sight ranging and Doppler measurements. We discuss how this technique has been adapted and implemented at the two ESA deep-space ground stations using existing equipment and infrastructure. These new capabilities were added by writing new software modules for the standard ESA digital receiver (the intermediate frequency modem system-IFMS). With these upgrades the receiver has the ability to record accurately timetagged signals from up to eight IF sub-channels. These sub-channels can have bandwidths of 50kHz-2MHz with a sample quantization of 1-16 bits per component. The IF samples are stored locally for subsequent retrieval over a WAN by the correlator facility at ESOC. (C) 2009 Elsevier Ltd. All rights reserved.

关键词： EUROPEAN SPACE AGENCY software module Receivers Wide area networks EAEC Supply Agency existing equipment Intermediate frequencies Laser-Doppler Velocimetry

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On the application of intelligent speech aids in English teaching under multimedia environment

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JOURNAL OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2021年第6期21卷 1999-2008页

作者： Zheng, Jin Yellow River Conservancy Tech Inst Conservancy Tech Inst Int Educ Dept Yellow River Kaifeng 475000 Henan Peoples R China

In order to improve the effect of English Teaching in multimedia environment, this paper proposes an English teaching method based on intelligent language AIDS in multimedia environment. Firstly, an intelligent speech teaching assistant system is designed in the multimedia environment. The software mainly includes four modules: new words and sentences, Chinese and English reading, voice evaluation, tools and settings. Learners can learn independently through the software, and teachers can also use the software to make various audio teaching resources in the classroom. In addition, the system can promote vocabulary teaching and support sentence pattern teaching and situational teaching in English teaching. The experimental results show that the average score of class 3A is increased from 86.35 to 86.79, with an increase of 0.64, which proves that the application of this method can effectively mobilize the enthusiasm of students in learning English and achieve good teaching effect.

关键词： Multimedia environment intelligent speech teaching aids english language teaching software module

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MEDIATORS IN THE ARCHITECTURE OF FUTURE INFORMATION-SYSTEMS

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COMPUTER 1992年第3期25卷 38-49页

作者： WIEDERHOLD, G STANFORD UNIV DEPT COMP SCISTANFORDCA 94305 USA

For single databases, primary hindrances for end-user access are the volume of data that is becoming available, the lack of abstraction, and the need to understand the representation of the data. When information is combined from multiple databases, the major concern is the mismatch encountered in information representation and structure. Intelligent and active use of information requires a class of software modules that mediate between the workstation applications and the databases. It is shown that mediation simplifies, abstracts, reduces, merges, and explains data. A mediator is a software module that exploits encoded knowledge about certain sets or subsets of data to create information for a higher layer of applications. A model of information processing and information system components is described. The mediator architecture, including mediator interfaces, sharing of mediator modules, distribution of mediators, and triggers for knowledge maintenance, are discussed

关键词： database management systems encoded knowledge end-user access future information systems information processing information representation information system components knowledge based systems knowledge maintenance knowledge representation mediator architecture mediator interfaces mediator modules multiple databases software module software modules user interfaces workstation applications

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Hardware-software co-implementation of a H.263 video codec

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IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 2000年第1期46卷 191-200页

作者： Jang, SK Kim, SD Lee, J Choi, GY Ra, JB Korea Adv Inst Sci & Technol Dept Elect Engn Yusong Gu Taejon 305701 South Korea Samsung Elect Co Ltd Suwon South Korea

In this paper, an H.263 video codec is implemented by adopting the concept of hardware and software co-design. Each module of the codec is investigated to find which approach between hardware and software is better to achieve real-time processing speed as well as flexibility. The hardware portion includes motion-related engines, such as motion estimation and compensation, and a memory control part. The remaining portion of the H.263 video codec is implemented in software using a RISC processor. This paper also introduces efficient design methods for hardware and software modules. In hardware, an area-efficient architecture for the motion estimator of a multi-resolution block matching algorithm using multiple candidates and spatial correlation in motion vector fields (MRMCS), is suggested to reduce the chip size. software optimization techniques are also explored by using the statistics of transformed coefficients and the minimum sum of absolute difference (SAD) obtained fi-om the motion estimator.

关键词： computer software RISC processors Computer hardware software module video codecs computer programs codecs motion estimation

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