• Journal of Broadcast Engineering
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• v.16 no.2
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• pp.350-359
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• 2011

Fast developments of broadcasting technologies since 1990s enabled not only High Definition Television service providing high quality audiovisual contents at home but also mobile broadcasting service providing audiovisual contents to high speed moving vehicle. Terrestrial Digital Multimedia Broadcasting (T-DMB) is one of the technologies developed for mobile broadcasting service, which has been successfully commercialized. One of the major technical breakthroughs achieved by T-DMB in addition to robust vehicular reception is an adoption of framework based on MPEG-4 System. It naturally enables integrated interactive data services by using Binary Format for Scene (BIFS) technology for scene description and representation of graphics object and Object Descriptor Framework representing multimedia service components as objects. T-DMB interactive data service has two fundamental limitations. Firstly, graphic data for interactive service should be always overlaid on top of a video not to be rendered out of it. Secondly, data for interactive service is only received by broadcasting channel. These limitations were considered as general in broadcasting systems. However, they are being considered as hard limitations for personalized data services using location information and user characteristics which are becoming widely used for data services of smart devices in these days. In this paper, the architecture of T-DMB hybrid data service is proposed which is utilizing broadcasting network, wireless internet and local storage for delivering BIFS data to overcome these limitations. This paper also presents hybrid BIFS technology to implement T-DMB hybrid data service while maintaining backward compatibility with legacy T-DMB players.

• Journal of Korean Society for Quality Management
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• v.25 no.4
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• pp.168-184
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• 1997

The primary objective of this paper is to develop an interactive computer graphic aided decision su, pp.rt system for the design of inspection plans for complex production systems. This research first develops a computer simulator, called Simulator for Inspection Systems(SIS), in order to represent the production system as a network model. The simulator elicits fundamental information about the system from the decision maker(DM) in an interactive manner. A decision su, pp.rt system is then proposed by combining SIS and Compromise Programming. The system simulates a set of possible inspection strategies implicitly, observes all the important measurements about the inspection system, and employs the compromise programming a, pp.oach to help the DM determine the best compromising allocation of inspection effort considering his/her preferences. Finally, the performance of the proposed system is evaluated using two test cases. The pros and cons of the system are also discussed.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.12 no.1
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• pp.131-140
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• 1992

For a real-time flood forecasting and reservoir control problem of a multipurpose dam, the online acquisition of hydro-meteorological data and computerized analysis of the acquired data are absolutely necessary for the prompt decision of reservoir discharges which can minimize the possible damages and simultaneously maximize the utilization of the runoff. By introducing a man-machine interface such as condensed color graphics of the analyzed results, it is much easier and faster to transform the information to the decision maker who can decide the reservoir discharge. The newly developed PC-REFCON, which represents the PC based real-time flood forecasting and reservoir control, can easily handle the above problems by adopting a innovative decision support system. The system has three principal components of, a data base subsystem which acquires and manages real-time data, a model subsystem which forecasts the flood runoff and simulates the reservoir operation, and a dialogue subsystem which helps decision maker and system engineers using various graphics and tables with renovative methodologies. The developed PC-REFCON will be utilized from the coming Summer of 1992 for the flood control of all the nine multipurpose reservoirs in Korea.

• Journal of the Korean Society of Safety
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• v.12 no.1
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• pp.140-145
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• 1997

안전측면에서 볼 때 각종 유해위험물질 정보분석은 산업현장의 교육자료 및 기초자료로 활용할 수 있고 이러한 사전 교육을 통해 예비지식을 습득함으로써 유해위험물질로 인해 발생 가능한 사고를 미연에 방지할 수 있어 유용하다. 이로 인해 각종 유해위험물질 정보를 제공하고자 1994년 말에 한국산업안전공단에서 제시한 "화학물질의 위험특성 조사 및 MSDS의 제도화 연구 보고서"에서 물질안전보건자료(MSDS)를 검색하는 도스용 프로그램이 개발되었고 국내에서는 통신을 이용한 서비스로는 KISCO-NET의 물질안전보건자료를 검색하는 대화형 방식의 서비스가 있다. 최근 들어 국외에서는 하이퍼텍스트 포맷을 사용한 그래픽환경의 클라이언트 프로그램인 웹 브라우저(Web Browser)로 World Wide Web 서버에 구축되어진 물질안전보건자료를 검색하는 사이트(site)가 늘어나고 있다. 이는 웹 서버가 단순히 문서만 전송하는 것이 아닌 멀티미디어 서비스를 지원하고 있을 뿐만 아니라 그래픽 환경의 클라이언트 프로그램으로 자료의 검색이 손쉽다는 점에서 웹상의 데이터 베이스화는 늘어가고 있는 추세이다. 하지만 현재까지 국내에는 물질안전보건자료를 웹상에서 검색할 수 있도록 한 웹 서버 구축사례는 없다. 따라서 1995년 초부터 작업을 시작하여 물질안전 보건자료를 검색하는 웹 서버를 국내에서 처음으로 구축하였으며 현재 거의 완성단계에 이르러 시범운전을 하고 있다.운전을 하고 있다.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.33-36
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• 2001

멀티 미디어 기술의 총아라고 불리는 차세대 디지털 방송의 핵심적인 기술인 MPEG-2 표준은 주로 방송용에 적합한 고화질 부호화가 목표였다. 1.5Mbps 이하의 저비트율, 즉 보다 고압축률의 부호화 방식에는 대응하고 있지 않았다. MPEG-4 표준 기술은 방송, 통신, 및 컴퓨터 분야에서 앞으로 차기 허용 대역폭이 증가는 하겠지만, 현재의 네트워크 대역폭이 비디오 데이터를 전송하기에는 저대역폭인 상황에서 전송을 위해 새롭게 사용될 멀티미디어 부호화 기술로서 자연 영상뿐만 아니라 그래픽 합성 영상 등 다양한 멀티미디어 정보를 사용자가 대화형으로 쉽게 접근, 편집 처리할 수 있는 기능을 제공한다. 이에 본 논문에서는 향후 다양한 응용 분야에 적용될 MPEG-4 비디오 부호화기를 직접 설계 및 구현함으로써 응용의 가능성을 검증할 수 있는 시스템을 제안한다. 실험결과는 제안한 부호화기의 구조가 국제표준에 근거하여 다양한 응용 제품의 개발에 적합함을 보여 준다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1994.10a
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• pp.707-712
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• 1994

An Enhanced Shopfloor Oriented Programming(AESOP) system is developed as a programming utillity of the CNC turning machine. The developed system is specially designed to give a beginner the convenience for CNC part programming with graphical interaction between a machine operator and the AESOP system. The combination of process-oriented cycles and various contour programming as well as an immediate tool path verification support the easiness and swiftness of a part program generation in the shopfloor. Since the AESOP system has been designed to operate on the basis of MS-Windows in the PC-embedded CNC system, it is also useful for the training of the part programming by utilizing provailing personal computers in the educational department.

• Journal of Broadcast Engineering
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• v.7 no.1
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• pp.21-27
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• 2002

This paper presents a mews event reenactment system (NERS), which generates virtual character animations in a quick and convenient manner. Thus, NERS can be used to produce computer graphics(CG) scenes of news events that are hard to photograph, such as fire, traffic accident, cases of murder, and so on. By using plenty of captured motion data and CG model data this system produces an appropriate animation of virtual characters straightforwardly without any motion capturing device and actors in the authoring stage. NERS is designed to be capable of making virtual characters move along user-defined paths, stitching motions smoothly and modifyingthe positions and of the articulations of a virtual character in a specific frame. Therefore a virtual character can be controlled precisely so as to interact with the virtual environments and other characters. NERS provides both an interactive and script-based (MEL: Maya Embedded Language) interface so that user can this system in a convenient way. This system has been implemented as a plug-in of commercial CG tool, Maya (Alias/wavefront), in order to make use of its advanced functions

• Journal of the Korea Computer Graphics Society
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• v.12 no.2
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• pp.19-25
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• 2006

정보생물학 분야에 있어서 분자 구조를 3차원으로 렌더링하여 보여주는 것은 매우 중요한 작업이다. 특히 분자의 표면 렌더링은 분자의 3차원 구조 분석 등에 중요하게 사용된다. 그러나 분자 표면 렌더링을 수행하기 위해서는 많은 양의 폴리곤이 필요하게 된다. 대장균 바이러스와 같은 분자량이 많은 거대 분자를 자연스럽게 렌더링 하기 위해서는 고성능이며 고가의 그래픽 전용 워크스테이션을 사용해야 한다. 본 논문에서는 PC급 시스템에서도 거대 분자를 무리 없이 렌더링 할 수 있는 효율적인 알고리즘을 제안 하였다. 제안하는 알고리즘은 사용자의 시점에서 최적의 성능 및 시각적인 기여를 할 수 있는 적응형 상세 단계 렌더링을 수행한다. 제안된 알고리즘을 사용하여 거대 분자 모델의 렌더링시 대화식 프레임 수준이상의 성능향상을 보이며, 또한 시각적으로도 분자 모델이 가진 중요한 기하학적인 특성을 유지 할 수 있다.

• The Transactions of the Korea Information Processing Society
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• v.3 no.5
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• pp.1082-1092
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• 1996

The design of distrbuted systems is difficult to achieve as the execution patterns of distrbuted systems are typically more complex than those of non- distributed systems. Thus, research toward the development of design methods for distributed systems is quitely needed. As object-oriented systems and distrbuted systems share similar properties, the combination of these two is somehow natural. In this work, a design of distributed systems is introduced. The goal of the method in this paper is to provide assistance to the process of specifying a formal object- oriented specification from graphical representation specification inputs such as data flow diagrams, state transition diagrams and Petri nets. It addresses the extraction of objects, operations and reationshipsfrom the problem domain with emphasis on the specification of the characteristics of distributed systems. This object identification method is supported by a knowledge base that provides for the automated analysis and reasoning about objects and their relationsships. The final object model is represented in a format which provides a formal mechanism for reprsenting the object information.

• Journal of Broadcast Engineering
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• v.6 no.1
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• pp.82-97
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• 2001

In this paper, we describe a software implementation of a digital TV stream analyzer that can be used for analyzing and verifying digital TV bitstreams on personal computes. It accepts as input MPEG-2 transport streams (TS's) already stored on hard disks and doesn't require any special hardware. After classifying TS packets into program specific information(PSI) TS section auido, video, program clock reference (PCR) private data and null packets, it displays their contents through a graphic user interface along with the syntax elements of the TS header. Also it displays the decoded I frame nearest in time axis the TS packet currently shown This feature helps pin pointing the specific location of problematic parts in bitstreams. The bitsteam analyzer provides the compliance test of MPEG-2 Systems standard and the data injection functionality with which one can easily insert additional data to existing MPEG-2 bitstreams. Using the resulting system one can produce at low test streams for interactive broadcasting and data broadcasting for laboratory use.