• Title, Summary, Keyword: Preprocessor

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Development of a Preprocessor Program for Articulated Total Body (ATB의 전처리 프로그램 개발)

  • Lee, Dong-Jae;Son, Kwon;Choi, Kyung-Hyun;Jeon, Kyu-Nam
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.5
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    • pp.214-222
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    • 2002
  • Computer simulations are widely used to analyze passenger safety in simulated traffic accidents. ATB, Articulated Total Body, is a computer simulation model developed to predict gross human body response to such dynamic environments as vehicle crashes and pilot ejections. ATB, whose code is open, has high flexibility and application capability that users can easily insert defined modules and functions. ATB is, however, inconvenient as it was coded in FORTRAN and it needs a formated input file. Moreover, it takes much time to make input files and to modify coding errors. This study aims to increase user friendliness by adding a preprocessor program, WINATB(WINdows ATB), to the conventional ATB. WINATB, programmed in Visual C++ and OpenGL, uses ATB IV as a dynamic solver. The preprocessor helps users prepare input files through graphic interface and dialog box. An additional postprocessor makes the graphical presentation of simulated results. In these case of the frontal crash, the rear impact and the side impact, the simulation results obtained by WINATB and MADYMO(MAthematical Dynamic Model) are compared to validate the effectiveness of WINAIB.

Development of Integrated Environment for Optimum Design Using Motif (모티프를 이용한 최적설계 통합환경 개발)

  • Lim, O-Kang;Cho, Heon;Kim,Young-Hyun;Lee, Byung-Woo
    • Computational Structural Engineering
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    • v.9 no.3
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    • pp.97-105
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    • 1996
  • An integrated environment for optimum design has been developed using Motif. The integrated environment is composed of the preprocessor, the postprocessor and the optimization part. The preprocessor is part of making a finite element model for optimum structural design and the postprocessor displays results of optimum design and the optimization part is the part which execute optimization. It is designed to reduce user's difficulties in structural optimum design. It used Graphic User Interface for the concurrent representation of various inputs and outputs through the dialog box, mouse and keyboard. Structural optimum design can be done easily through dialog box, menu, concurrent representation of modeling process and results of structural optimum design can be understood easily through stress contour, deformed model and graph of cost function.

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Development of Automatic Data Generation Program for Finite Element Structural Analysis of Oil Tankers (유조선 구조해석을 위한 유한요소 입력자동화 프로그램의 개발)

  • S.W. Park;J.G. Shin
    • Journal of the Society of Naval Architects of Korea
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    • v.29 no.3
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    • pp.149-156
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    • 1992
  • An efficient preprocessor is developed for the finite element structural analysis of a ship's hull module. A hull module structure is divided into three groups for easy data handling : longitudinal members, transverse members, and transverse bulkheads. Based on the classification rules and design practices at shipyards, the preprocessor can create finite element nodes, elements, boundary conditions, and loadings automatically. By connecting the preprocessor with the ANSYS program, we can obtain the results of ship structureal analysis more efficiently. Applied to a typical double-hull oil tanker, the present preprocessor shows various advantages over conventional general-purpose preprocessors.

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Development of Real-time Multibody Vehicle Dynamics Software Part II: Preprocessor and Postprocessor Using MATLAB GUI and VR Toolbox (실시간 다물체 차량동역학 소프트웨어 개발 Part II: Matlab GUI와 VR Toolbox를 이용한 전후처리 프로그램)

  • Ha, Kyoung-Nam;Jeong, Wan-Hee;Kim, Sung-Soo;Jung, Do-Hyun;Tak, Tae-Oh
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.1
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    • pp.169-175
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    • 2009
  • Real-time multibody vehicle dynamics software has been developed for virtual handling tests. The software can be utilized for HILS(Hardware In the Loop Simulations) and consists of three modules such as a graphical vehicle modeling preprocessor, a real time dynamics solver, and a virtual reality graphic postprocessor for virtual handling tests. In the graphical vehicle modeling preprocessor, vehicle hard point data for a suspension model are automatically converted into multibody vehicle model. In the real time dynamics solver, the efficient subsystem synthesis method is used to create multibody equations of motion for a subsystem by a subsystem. In the virtual reality graphic postprocessor, an animator has been also developed by using Matlab Virtual Reality Toolbox for virtual handling tests.

A Development of Synthetic Map Preprocessor for Mobile GIS Visualization based on GML (GML 기반 모바일 GIS 가시화를 위한 Synthetic Map Preprocessor 구축)

  • Song Eun-Ha;Park Yong-Jin;Han Sung-Kook;Jeong Young-Sik
    • The KIPS Transactions:PartC
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    • v.13C no.3
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    • pp.383-388
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    • 2006
  • Most of GIS services have been operated in single applications, and as data processing and computer and mobile technologies have developed rapidly, users request for efficient sharing between each GIS's own data and various different GIS's. However, since many GIS applications maintain their own data formats, they are incapable of processing data formats different with each other, and do not have a filtering function for mobile GIS. This paper designs an integrated preprocessor, SMP to accept features of various current formats of geographic information such as DXF(Drawing eXchange Format), DWG(DraWinG), SHP(SHaPefile), etc., and to extract core information for describing maps. The geographic information extracted by SMP(Synthetic Map Preprocessor) shows consistency in various formats by visualizing through the integrated view. By generating the extracted core data in GML, it supports rapid access to mobile devices and extensibility of file formats overcoming heterogeneity.

Stereo Acoustic Echo Canceller Using Difference Components of Channel Signals (채널 신호의 차성분을 이용한 스테레오 음향 반향 제거기)

  • Kim Hyun Tae;Park Jang Sik;Son Kyung Sik
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.119-122
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    • 1999
  • In stereo acoustic echo canceller scheme, adaptive filters coefficients converge very slowly or misconverge to real acoustic echo path in receiving room. This is due to cross-correlation between channel signals. In this paper, new preprocessor using absolute difference factor between stereo signals is proposed to reduce cross-correlation between signals. Computer simulations demonstrate that this preprocessor perform well to the half wave rectifier which has simple and good performance of the several preprocessors in recent papers. When the paths in transmitting room change, performance does not degrade in proposed preprocessor.

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A Design of the Real-Time Preprocessor for CMOS image sensor (CMOS 이미지 센서를 위한 실시간 전처리 프로세서의 설계)

  • 정윤호;이준환;김재석
    • Proceedings of the IEEK Conference
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    • pp.224-227
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    • 1999
  • This paper presents a design of the real-time preprocessor for CMOS image sensor suitable to the digital camera applications. CMOS image sensor offers some advantages in on-chip integration, system power reduction, and low cost. However, it has a lower-quality image than CCDs. We describe an image enhancement algorithm, which includes color interpolation, color correction, gamma correction, sharpening, and automatic exposure control, to compensate for this disadvantage, and present its efficient hardware architecture to implement on the real-time processor. The presented real-time preprocessor was designed using VHDL, and it contains about 19.2K logic gates. We also implement our system on FPGA chips in order to provide the real-time adjustment and it was successfully tested.

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Enhanced Differential Power Analysis based on the Generalized Signal Companding Methods (일반화된 신호 압신법에 기반한 향상된 차분전력분석 방법)

  • Choi, Ji-Sun;Ryoo, Jeong-Choon;Han, Dong-Guk;Park, Tae-Hoon
    • The KIPS Transactions:PartC
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    • v.18C no.4
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    • pp.213-216
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    • 2011
  • Differential Power Analysis is fully affected by various noises including temporal misalignment. Recently, Ryoo et al have introduced an efficient preprocessor method leading to improvements in DPA by removing the noise signals. This paper experimentally proves that the existing preprocessor method is not applied to all processor. To overcome this defect, we propose a Differential Trace Model(DTM). Also, we theoretically prove and experimentally confirm that the proposed DTM suites DPA.

An Intelligent Search Modeling using Avatar Agent

  • Kim, Dae Su
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.4 no.3
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    • pp.288-291
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    • 2004
  • This paper proposes an intelligent search modeling using avatar agent. This system consists of some modules such as agent interface, agent management, preprocessor, interface machine. Core-Symbol Database and Spell Checker are related to the preprocessor module and Interface Machine is connected with Best Aggregate Designer. Our avatar agent system does the indexing work that converts user's natural language type sentence to the proper words that is suitable for the specific branch information retrieval. Indexing is one of the preprocessing steps that make it possible to guarantee the specialty of user's input and increases the reliability of the result. It references a database that consists of synonym and specific branch dictionary. The resulting symbol after indexing is used for draft search by the internet search engine. The retrieval page position and link information are stored in the database. We experimented our system with the stock market keyword SAMSUNG_SDI, IBM, and SONY and compared the result with that of Altavista and Google search engine. It showed quite excellent results.

A Development of Integrated Map Preprocessor for Mobile GIS Visualization (Mobile GIS 가시화를 위한 Integrated Map Preprocessor 개발)

  • Jeon, Chang-Young;Park, Jun;Song, Eun-Ha;Jeong, Young-Sik
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.707-710
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    • 2005
  • 과거 지리정보시스템 서비스들은 단일 어플리케이션에서 동작되어 왔다. 데이터 처리 기술의 급속한 발전과 컴퓨터 및 Mobile 사양이 높아지면서 사용자들은 각각의 지리정보시스템 자체 데이터는 물론, 이질적인 다른 여러 지리정보시스템의 통합 가시화와 효율적인 공유를 요구하고 있다. 그러나, 많은 지리정보시스템 어플리케이션들은 자체 데이터 포맷과 상이한 데이터 포맷에 대해서 처리하지 못하는 단점을 가지고 있다. 본 논문에서는 지리정보시스템의 대표적인 형식이고 국립지리원에서 제공하고 있는 DXF(Drawing eXchange Format)파일 포맷과 현재 사용되고 있는 지리 정보인 DWG(DraWinG), SHP(SHaPefile)등의 포맷을 통합된 하나의 뷰어를 통해 가시화하기 위한 IMP(Integrated Map Preprocessor)를 설계한다. 또한 Mobile 지리정보시스템 환경에서의 데이터 활용을 효과적으로 하기 위해 추출된 정보를 공통된 기준의 의미부여로 인덱싱화하여 DB에 저장한다.

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