• 전자공학회논문지A
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• 제33A권10호
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• pp.186-194
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• 1996

The SliM (sliding memory plane) array processor has been proposed to alleviate disadvantages of existing mesh-connected SIMD(single instruction stream- multiple data streams) array processors, such as the inter-PE(processing element) communication overhead, the data I/O overhead and complicated interconnections. This paper presents the deisgn and implementation of SliM image processor ASIC (application specific integrated circuit) chip consisting of mesh connected 5 X 5 PE. The PE architecture implemented here is quite different from the originally proposed PE. We have performed the front-end design, such as VHDL (VHSIC hardware description language)modeling, logic synthesis and simulation, and have doen the back-end design procedure. The SliM ASIC chip used the VTI 0.8$\mu$m standard cell library (v8r4.4) has 55,255 gates and twenty-five 128 X 9 bit SRAM modules. The chip has the 326.71 X 313.24mil$^{2}$ die size and is packed using the 144 pin MQFP. The chip operates perfectly at 25 MHz and gives 625 MIPS. For performance evaluation, we developed parallel algorithms and the performance results showed improvement compared with existing image processors.

• 한국CDE학회논문집
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• 제4권2호
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• pp.87-99
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• 1999

We developed a Part Information Brokering System, namely PIBS, that can inter-link part suppliers and buyers using WWW(World Wide Web). The major contribution of this paper is that the system provides a 3D collaboration environment that enables multiple users to share the same workspace where they cooperatively manipulate part features in real time. PIBS carries out two major functions: one to maintain part data in a part library, and the other to provide the means for the clients to cooperate. An object-oriented database is used for the part library which stores apart information registered by part suppliers. VRML(Virtual Reality Modeling Language) the ISO standard for 3D visualization on WWW, is used to represent 3D part models. Several Java programs have been implemented to support synchronous and a synchronous communication of the 3D models. Once the users are interconnected through the system, a user's manipulation of part objects is transparently and instantaneously transmitted to the others. This means that all the participants can are the same view and movement of the 3D part models. Since the system is developed using a Java applet-server architecture, it requires no additional software other than standard web browser. The prototype system has been successfully implemented, and demonstrated its applicability to virtual 3D part information sharing.

• 한국CDE학회논문집
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• 제11권3호
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• pp.183-196
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• 2006

A new operation strategy. which can guarantee the data consistency of engineering information among the various intelligent information systems, is presented for engineering information of bridges, and construction methodology of integrated database is developed to support the strategy. The two core standard techniques are adopted to construct the integrated database. One is the Standard for the Exchange of Product Model Data (STEP) for CAD/CAE information and the other is the Extensible Markup Language(XML) for engineering document information. The former enabler structural engineers to handle the structural details with three-dimensional geometry-based information of bridges, and ACIS solid modeling kernel is employed to develop AutoCAD based application modules. The latter can make document files into data type for web-based application modules which assist end-users to search and retrieve engineering document data. In addition, relaying algorithm is developed to integrate the two different information, e.g. CAD/CAE information and engineering document information. The pilot application modules are also developed, and a case study subjected to the Han-Nam bridge is presented at the end of the paper to illustrate the use of the developed application modules.

• 가정과삶의질연구
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• 제28권2호
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• pp.111-121
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• 2010

This study examined the variables that influence career maturity in elementary school students and tested a hypothetical structural equation model relating the variables to career maturity. The subjects were 2,771 fourth-grade children(1,494 boys and 1,277 girls) who participated in a Korea Youth Panel Survey(KYPS) in 2004. Data were analyzed through frequency, percentages, Pearson's correlations using SPSS 15.0and structural equation modeling with AMOS7.0. The findings are as follows. The proposed model, as revised, demonstrated the effectiveness of an analysis of the structural equation model, and illustrated that the socio-economic status of parents has only an indirect influence on children's career maturity via relationship with parents, children's self-image or academic work. In addition, relationship with parents, children's self-image, and academic work independently affected children's career maturity both directly and indirectly. Based on the causal relationships among these related variables, the findings reveal that the best pathway towards children's career maturity is in the order of socio-economic status, relationship with parents, children's self-image, and children's academic work.

• Journal of Information Technology Applications and Management
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• 제12권1호
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• pp.157-172
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• 2005

Recently, location-based service (LBS) is a hot issue in the field of computer applications. So many papers introducing new techniques of implementing a LBS and new application fields of LBS have been published recently. However, to the best of our knowledge, none of them discusses feasibility test in the prior to the implementation. The importance of a feasibility test for a design prior to the implementation cannot be overemphasized. This paper presents a method of feasibility test for a LBS design. Our method performs three steps. At the first step, we build a Petri net model of the LBS system which is depicted in natural language. The second step is to analyse the Petri net to find errors and flaws in the design. We also improve the Petri net model by fixing the errors and flaws in this step. A feasibility test is the third and final step. In this step. we verify if the design satisfies the user's requirement in the senses of quality of service (QoS) and of minimizing the implementation cost. The third step is performed in the manner of mathematical analysis of the Petri net.

• 한국정보시스템학회:학술대회논문집
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• 한국정보시스템학회 2001년도 추계학술대회 발표논문집:차세대 전상거래 시대의 비즈니스전략
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• pp.181-193
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• 2001

최근 대학도서관들은 정보화 환경에 대한 능동적 대처를 위하여 많은 노력을 기울이고 있다. 교수나 학생의 연구, 교육, 학습에 필요한 각종 전자 정보원을 한 장소에서 검색, 열람이 가능하고 대학의 구성원들에게 새로운 정보기술과 정보의 활용 능력을 교육시키기 위한 다양한 기능을 가진 하나의 복합 공간으로서 전자 정보실 또는 멀티미디어실(이하 멀 티미디어실) 등을 설치, 운영하고 있다 그러나 아직도 대학도서관 내의 멀티미디어실의 역할과 개념이 모호하다는 지적이 나오고 있다. 이러한 가운데 운영면에서도 표준 솔루션의 부재로 관리 전산화가 이루어져 있는 곳이 부족하여 인력 및 시간의 낭비가 초래되고 이용자 관리에 있어서 어려움을 겪고 있는 실정이다. 체계적인 운영이 이루어지지 않고서는 양질의 서비스 제공은 기대하기 어려울 것이다. 따라서 전국 대학 도서관에 적용할 수 있는 표준적인 멀티미디어실 관리 시스템의 개발이 필요하다. 본 연구에서는 UML(Unified Modeling Language) 기반의 정보시스템 구축 방법론을 제시하고, 제시된 방법론의 유효성(effectiveness)을 검증하기 위하여, 본 방법론에 입각하여 동국대학교 경주캠퍼스의 멀티미디어실 업무 프로세스를 분석 설계하였다. 시스템 구현을 위해서, 데이터 베이스로는 Oracle RDBMS를, 개발도구로는 Visual Basic 6.0을 사용하였다 본 논문에서 구현된 시스템을 통하여 멀티미디어실의 효과적인 운영관리에 대한 기반정립에 기여하고, 향후 장기적인 발전계획 수립에 하나의 도구로서 사용될 수 있다고 판단된다.

• 대한전자공학회논문지
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• 제26권5호
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• pp.71-78
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• 1989

다단성을 접속망의 성능평가를 위해 접속망을 모델링하는 방법과, 시뮬레이션 알고리듬을 제안하였으며, 이를 프로그램으로 구현하였다. 특히 여러개의 입력단에서 접속 요구가 동시에 발생한 경우를 처리하기 위해 상태변수를 설정하였으며, 각 단의 처리과정을 추적하기 위해 접속망 전체에 대한 정보를 갖는 자료 구조를 제안함으로써 순차적 처리를 하는 기존의 컴퓨터에 적용할 수 있었다. 이 방법에 의하면 다단상호 접속망에 대한 성능평가는 복잡한 수학적 해석에 의존하지 않고서 시뮬레이션으로 결과를 산출하게 되었다.

• 대한토목학회논문집
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• 제14권5호
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• pp.999-1011
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• 1994

운전자의 주행거동(走行擧動)은 도로구조, 교통상황 뿐만 아니라 운전자의 인지(認知)와도 관련된 것이다. 그래서 본 연구에서는 운전자에 대한 차간거리(車間距離) 인지실험(認知實驗) 및 그 특성의 분석을 실시하였다. 주행거동(走行擧動) 실험에서는 차량에 장착한 비데오카메라를 사용하여 운전자의 대한 차간거리(車間距離) 인지(認知)에 대한 언어적(言語的) 수준(水準) 등을 녹화하였다. 연구결과 운전자의 차간거리인지(車間距離認知)는 Weber-Fechner법칙에 따름을 알수 있었다. 본 연구는 도로주행시 얻어지는 시각정보(視覺情報)에 대한 인지(認知) 모델화방법(方法)을 제시한 것이다.

• 한국인터넷방송통신학회논문지
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• 제13권2호
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• pp.149-155
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• 2013

오늘날 대표적인 데이터베이스 설계 도구로 개체 관계 모델을 사용하고 있으며, 데이터를 표현하고 교환하는 표준 언어로 XML을 사용하고 있다. 그러나 많은 개체 관계 모델 제품들은 각각 서로 다른 표현형식을 사용하기 때문에 이들 제품들 사이에 호환성에 어려운 점이 있으며, XML은 언어가 갖는 복잡성으로 인해 XML을 이용하여 현실세계를 직접 설계하기에는 어려운 점이 있다. 본 논문은 이질적인 제품들 사이의 호환성을 제공하기 위해 개체 관계 모델을 XML 스키마로 변환하는 도구인 ERX(Entity-Relationship model to Xml)를 제안한다. ERX는 입력으로 개체 관계 다이어그램을 받아 이를 변환 규칙을 통해 XML 스키마를 출력한다. 변환 규칙에는 개체집합, 관계집합, 매핑 대응수(mapping cardinality), 일반화(generalization) 개념 등을 포함한다.

• 대한안전경영과학회지
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• 제16권1호
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• pp.79-88
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• 2014

The rapid growth of complexity and scale can be witnessed in the design and development of modern systems. As such, the severity of damages in the occasional accidents has attracted great deal of attention lately. Although a variety of methods have so far been studied to overcome or reduce the disastrous results of hazards, the issues seem still persistent and even complicated due to the situation mentioned above. The concept of functional safety has been regarded as one approach to handling the matters by shifting up to the functions level from the consideration of each physical component itself. The outcomes of those efforts would be the international standards on functional safety such as IEC 61508 and its relatives including IEC 62278, EN 50128, ISO26262, and so on. In this paper, a method of how hazards can be analyzed to be coped with those standards has been studied. In the method proposed, the systems modeling language (SysML) is playing a key role to model and analyze the hazards from the viewpoint of functional safety. The approach taken has been applied in the analysis of the hazards in railroad systems. In spite of focusing on the individual components hazards, the method based on functional safety has analyzed them collectively with the added effect of identifying the cause originated from the interface between the functions.