• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 C
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• pp.1137-1139
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• 1998

Effective database is the key to manage automatic distribution system. Currently, automatic distribution system database has been studied with a relational concept. But, it is hard to describe the characteristic of automatic distribution system data which require real time management and composite type. This paper present the way how to design conceptual schema for EMS database using object-oriented concept which is free to decribe composite data type and support inheritance concept.

• 한국항공우주학회지
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• 제31권5호
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• pp.124-133
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• 2003

본 논문은 항공기 무장의 목록관리, 무장의 활성화, 그리고 무장의 발사 및 투하를 제어하고 관리하는 무장관리컴퓨터 탑재소프트웨어 개발 시 객체지향 설계기법을 적용하는 방법을 제안한다. 무장관리컴퓨터 개발을 위해 중앙처리장치 보드는 상용화된 PowerPC 603e의 군용모델을 사용하였으며 실시간 운용체계인 VxWorks와 Tornado개발환경을 이용하여 소프트웨어를 개발하였다. 소프트웨어 개발 시 객체지향 언어인 Ada95를 사용하였으며 소프트웨어 모듈간의 독립성을 위해 세 개의 층(Layer)으로 분리하여 설계하였다. 항송전자시스템컴퓨터 시뮬레이터와 테스트 벤치를 개발하여 무장관리시스템 하드웨어/소프트웨어 통합검증테스트를 수행하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 D
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• pp.1187-1189
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• 1997

Currently, EMS(Energy Management System) database is implemented by relational concept but, It is hard to describe the characteristic of power system data which require real time management and composite type. This paper present the way how to design conceptual schema for EMS database using object-oriented concept which is free to describe composite data type and support inheritance concept.

• Journal of Computing Science and Engineering
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• 제2권4호
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• pp.375-393
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• 2008

The dynamic cast operation allows flexibility in the design and use of data management facilities in object-oriented programs. Dynamic cast has an important role in the implementation of the Data Management Services (DMS) of the Mission Data System Project (MDS), the Jet Propulsion Laboratory's experimental work for providing a state-based and goal-oriented unified architecture for testing and development of mission software. DMS is responsible for the storage and transport of control and scientific data in a remote autonomous spacecraft. Like similar operators in other languages, the C++ dynamic cast operator does not provide the timing guarantees needed for hard real-time embedded systems. In a recent study, Gibbs and Stroustrup (G&S) devised a dynamic cast implementation strategy that guarantees fast constant-time performance. This paper presents the definition and application of a cosimulation framework to formally verify and evaluate the G&S fast dynamic casting scheme and its applicability in the Mission Data System DMS application. We describe the systematic process of model-based simulation and analysis that has led to performance improvement of the G&S algorithm's heuristics by about a factor of 2. In this work we introduce and apply a library for extracting semantic information from C++ source code that helps us deliver a practical and verifiable implementation of the fast dynamic casting algorithm.

• 대한의용생체공학회:의공학회지
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• 제18권4호
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• pp.381-388
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• 1997

본 논문은 환자 모니터링 시스템에서 환자 모니터, 중앙 환자 모니터, DB서버 그리고 임상 의사용 워커스테이션을 연결하기 위한 인터베드 통신망의 통신방식의 설계와 구현에 대해 기술하였다. 실시간 생체신호 모니터링을 위해 필요한 조건들을 바탕으로 각종 메시지 형식과 교환방식을 결정하였으며, 객체지향 설계기법을 적용하여 구현하였다. 현재, 인터베드 통신방식을 사용하여 구현된 서비스는 모니터링 중인 환자들에 대한 정보를 제공하기 위한 환자 위치 결정 서비스와 실시간으로 환자의 생체 신호 정보를 전달하기 위한 원격 환자 모니터링 서비스이다. 임상 현장에서 실험한 결과 이들 서비스들이 실시간 생체신호 모니터링에 필요한 조건들을 모두 만족하고 있음을 확인하였다.

• Korean Journal of Geomatics
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• 제3권1호
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• pp.15-22
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• 2003

This study aims to construct a management system of road position information as part of the build-up to a maintenance and management system of highways. First, information on the positions of the roads were obtained by a real-time kinematic satellite surveying, and then the degree of accuracy was analyzed in comparison with the data of the existing design drawings. The linear coordinates of road center line obtained by using RTK GPS showed about 7.6-13.2cm errors in X and Y directions in the case of the national road No.2 section, and about 8.4-9.2cm errors in the case of local road No.1045 section. These errors were within the tolerance scope regulated by the TS survey, and could be practically used. In the case of vertical alignment, there were about 6.2cm errors in the Z direction in local road No.1045 section. Aerial photographs are normally used in producing numerical maps, and it can be practically used because the tolerance scope of the elevation control point is l0cm when the scale of aerial photographs is 1/1000. The management system of road position information, utilizing Object-Oriented Programming(OOP), was built having the data acquired in this way as the attribute data. The system developed in this way can enable us to spot the positions of road facilities, the target of management with ease, to easily update the data in case of changes in the positions of roads and road facilities, and to manage the positions of roads and road facilities more effectively.

• 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.

• Journal of Mechanical Science and Technology
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• 제15권4호
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• pp.448-458
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• 2001

The primary goal of virtual prototyping is to eliminate the need for fabricating physical prototypes, and to reduce cost and time for developing new products. A virtual prototyping seeks to create a virtual environment where the development of a new model can be flexible as well as rapid, and experiments can be carried out effectively concerning kinematics, dynamics, and control aspects of the model. This paper addresses the virtual environment used for virtual prototyping of a passenger vehicle. It has been developed using the dVISE environment that provides such useful features as actions, events, sounds, and light features. A vehicle model including features, and behaviors is constructed by employing an object-oriented paradigm and contains detailed information about a real-size vehicle. The human model is also implemented not only for visual and reach evaluations of the developed vehicle model, but also for behavioral visualization during a crash test. For the real time driving simulation, a neural network model is incorporated into the virtual environment. The cases of passing bumps with a vehicle are discussed in order to demonstrate the applicability of a set of developed models.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제5권4호
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• pp.440-448
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• 1999

본 논문은 객체지향형 분산처리 환경 하에서 오디오나 비디오 등과 같은 실시간(real-time) 스트림(stream) 데이타를 처리하는 데 필요한 소프트웨어 기반구조를 설계하고 구현한 내용을 기술한다. 본 논문에서 제시한 DAViS(Distributed Object Framework supporting Audio/Video Streaming)는, 오디오/비디오 데이타의 처리와 관련된 여러 소프트웨어 구성요소들을 분산객체로 추상화하고, 그 객체들간의 제어정보 교환경로와 오디오/비디오 데이타 전송경로를 서로 분리하여 처리한다. 분산응용프로그램 작성자는 DAViS에서 제공하는 서비스들을 이용하여, 기존의 분산프로그래밍 환경이 제공하는 것과 동일한 수준에서 오디오/비디오 데이타에 대한 처리를 표현할 수 있다. DAViS는, 새로운 형식의 오디오/비디오 데이타를 처리하는 부분을 손쉽게 통합하고, 하부 네트워크의 전송기술이나 컴퓨터시스템 관련 기술의 진보를 신속하고 자연스럽게 수용할 수 있도록 하는 유연한 구조를 가지고 있다. Abstract This paper describes the design and implementation of software framework which supports the processing of real-time stream data like audio and video in distributed object-oriented computing environment. DAViS(Distributed Object Framework supporting Audio/Video Streaming), proposed in this paper, abstracts software components concerning the processing of audio/video data as distributed objects and separates the transmission path of data between them from that of control information. Based on DAViS, distributed applications can be written in the same abstract level as is provided by the existing distributed environment in handling audio/video data. DAViS has a flexible internal structure enough to easily incorporate new types of audio/video data and to rapidly accommodate the progress of underlying network and computer system technology with very little modifications.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.1665-1670
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• 2007

The On-Board Computer System Used for rolling stocks is one of the core equipments in trains, which deals with collecting real-time data of a train to display and record the train's status, control the train, and assist the driver and maintenance function. To design control software for such complex control system, in this paper UML based modeling technique is applied. A behaviorally expressive set of diagrammatic languages for modeling object-oriented systems is presented. It constitutes the constructive subset of UML, and also it enables model execution and full code synthesis.