• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.263-264
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• 2006

City Train Technology that is large and complex system and consists of mechanical, electronic, electric, materials, computer, communication, civil/track etc. is very important area of railway industry, national fundamental industry. The standardization of city train system as a public transportation method and foundation of national economy is very important in order to do effective operation and to get fundamental technology, and the information system of the standards is required to operate the city train system effectively. By building data base of city train system design knowledge using computer-aided system engineering tool-Cradle, the system development issues and the design solutions are used by all engaged persons, and are managed by modeling and documentation. And this system will support architecture design consistently and effectively by applying this system to formalize early development process, to system requirements and configuration management, to system interface analysis and management and to system behavior analysis etc.. This study is for construction of data base of system design knowledge through making data base of many kinds of standards using CASE tool based on System Engineering Process, and introduces a model to support concurrent engineering for all engineers involved in system development allowing access to standard DB through Web from anywhere and at anytime.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.261-262
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• 2006

City Train Technology that is large and complex system and consists of mechanical, electronic, electric, materials, computer, communication, civil/track etc. is very important area of railway industry, national fundamental industry. The standardization of city train system as a public transportation method and foundation of national economy is very important in order to do effective operation and to get fundamental technology, and the information system of the standards is required to operate the city train system effectively. By building data base of city train system design knowledge using computer-aided system engineering tool-Cradle, the system development issues and the design solutions are used by all engaged persons, and are managed by modeling and documentation. And this system will support architecture design consistently and effectively by applying this system to formalize early development process, to system requirements and configuration management, to system interface analysis and management and to system behavior analysis etc.. This study is for construction of data base of system design knowledge through making data base of many kinds of standards using CASE tool based on System Engineering Process, and introduces a model to support concurrent engineering for all engineers involved in system development allowing access to standard DB through Web from anywhere and at anytime.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.259-260
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• 2006

City Train Technology that is large and complex system and consists of mechanical, electronic, electric, materials, computer, communication, civil/track etc. is very important area of railway industry, national fundamental industry. The standardization of city train system as a public transportation method and foundation of national economy is very important in order to do effective operation and to get fundamental technology, and the information system of the standards is required to operate the city train system effectively. By building data base of city train system design knowledge using computer-aided system engineering tool-Cradle, the system development issues and the design solutions are used by all engaged persons, and are managed by modeling and documentation. And this system will support architecture design consistently and effectively by applying this system to formalize early development process, to system requirements and configuration management, to system interface analysis and management and to system behavior analysis etc.. This study is for construction of data base of system design knowledge through making data base of many kinds of standards using CASE tool based on System Engineering Process, and introduces a model to support concurrent engineering for all engineers involved in system development allowing access to standard DB through Web from anywhere and at anytime.

• 한국정보처리학회논문지
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• 제5권9호
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• pp.2435-2446
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• 1998

본 논문에서는 함수 논리 언어를 수행할 수 있는 데이터 플로우 표현 방법을 제시하고 함수 논리 언어의 각 결과 함수를 데이터플로우 그래프로 변환하는 방법에 대해 설명한다. 실행의 효율성을 높이기 위해 AND-병렬성을 위한 종속성 분석을 서브고울과 병행 수행하여 지연시간을 줄였으며, 함수 부분의 수행을 위해 병렬 감축을 사용하였다. RAP을 도입함으로써 발생하는 지연시간을 줄이기 위해 종속성 분석과 서브 고울을 병렬로 처리함으로써 CGE+ 표현 방식에 비해 효율적임을 보였다. 지능형 퇴각 검색을 도입하여 병렬 컴퓨터에서 효율적인 수행을 할 수 있도록 하였다.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2004년도 추계 종합학술대회 논문집
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• pp.395-401
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• 2004

In the current high network-centralized computing and enterprising environment, it is getting essential to transmit data reliably at very high rates. Until now previous client/server model based NFS(Network File System) or AFS(Andrew's Files System) have met the various demands but from now couldn't satisfy those of the today's scalable high-performance computing environment. Not only performance but data sharing service redundancy have risen as a serious problem. In case of NFS, the locking issue and cache cause file system to reboot and make problem when it is used simply as ip-take over for H/A service. In case of AFS, it provides file sharing redundancy but it is not possible until the storage supporting redundancy and equipments are prepared. Lustre is an open source based cluster file system developed to meet both demands. Lustre consists of three types of subsystems : MDS(Meta-Data Server) which offers the meta-data services, OST(Objec Storage Targets) which provide file I/O, and Lustre Clients which interact with OST and MDS. These subsystems with message exchanging and pursuing scalable high-performance file system service. In this paper, we compare the transmission speed of gigabytes file between Lustre and NFS on the basis of concurrent users and also present the high availability of the file system by removing more than one OST in operation.

• Journal of Chest Surgery
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• 제42권4호
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• pp.528-531
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• 2009

경식도 초음파는 심장수술에서 비교적 안전하게 수술 중 심장의 기능 및 수술 결과를 평가할 수 있어 그 이용이 일반화되고 있으며, 경식도 초음파 관련 합병증은 드물지만 하인두 손상이나 식도 천공 등 위험한 합병증이 생길 수 있다. 폐부종을 동반한 심근경색으로 진단받은 77세 남자환자에서 심폐 바이패스를 사용하 않는 관상동맥우회술 시행 후, 수술 중 경식도 초음파 시술과 관련되어 발생한 것으로 추정되는 pyriform sinus 천공 및 이에 동반된 경부 심부감염을 경험하여 보고하는 바이다.

• 대한전자공학회논문지SP
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• 제48권5호
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• pp.123-128
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• 2011

본 논문에서는 레이더의 탐지 알고리즘에 적용되는 CA-CFAR 알고리즘을 설계하였다. CFAR 알고리즘의 제곱평균 연산을 위해 근사화 기법을 사용하였으며, 고정 소수점을 이용하여 관련 연산을 처리하였다. 이러한 구조는 하드웨어 복잡도를 줄일 뿐 아니라 계산량을 감소시킬 수 있다. CFAR 연산은 슬라이딩 윈도우 기법을 기반으로 하는데, 이를 고속으로 처리하기 위해 동시 병렬 처리 가능한 다중 윈도우 방식도 제안하였다. 제안된 CA-CFAR 프로세서는 실제 FPGA를 통해 합성되어지고 구현되었다. 또한 FPGA 내에서 제공한 라이버러리를 이용한 제곱평균 연산 방법과 성능 비교를 하였다. 검증 결과 제안된 하드웨어 구조는 399MHz까지 동작가능하며, 전체 계산 시간은 약 70% 향상됨을 확인 할 수 있다.

• 융합보안논문지
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• 제17권3호
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• pp.31-40
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• 2017

UAV(Unmanned Aerial Vehicle, 드론)는 재난재해, 유통, 물류 등 다양한 분야로의 활용가치가 증대되고 있으나, 관련 법규의 미비, 사생활 침해 등이 산업성장의 저해요소로 지적되고 있다. 이에 앞으로 전개될 UAV의 융합서비스에 대해 규제 프레임워크를 기반으로 규제방향성을 제시하였다. 기술관점에서는 아키텍쳐 설계에 대한 규제, 시장관점에서는 제한된 영역에서의 서비스 병행운영, 법적으로는 입법 예고된 영상정보보호법 하의 사전규제보다는 사후평가 중심, 사회규범 관점에서는 사회적 공감대 형성을 위한 노력을 통해 UAV기반 융합서비스 조기 정착에 기여할 것으로 생각한다.

• 한국지능시스템학회논문지
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• 제23권1호
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• pp.87-92
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• 2013

In this paper, we developed a digital and integrated PA(Public Address) system with speech recognition and sensor connection based on IP with an ID using agent. It has facilities such as an external input, a microphone and a radio for a PA system and has speech recognition. If "fire" is spoken to the PA system then it can recognize the emergency situation and will broadcast information to the appropriate agency immediately. In addition to that, many sensors, such as temperature, humidity, and infrared, etc., can be connected to the PA system and can be integrated with the context awareness which contains many types of information about internal statuses using inference agent. Also, developed the digital integrated PA system will make it possible to broadcast the message to adaptable places using network IP based on IDs. Finally, the digital PA system is designed for operation from a PC, which makes installation and setting of operating parameters very simple and user-friendly. For implementation details, we implemented thread based concurrent processing for the events which occur concurrently from many sensors or users.

• The Journal of Korean Physical Therapy
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• 제27권1호
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• pp.30-37
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• 2015

Purpose: The purpose of this study was to develop a computer access assessment tool for persons with physical disabilities and to evaluate reliability and validity. Methods: We developed a computerized Computer access Assessment Program (CAP) through many kinds of literature review and tools analysis for evaluation of computer access, task analysis of fundamental input devices operation and expert review. The CAP data were obtained from 105 normal university students and 16 students with physical disabilities. The test items of CAP are composed of four timed mouse tasks, four timed keyboard tasks, and a timed scanning task. Thus, the software measures user performance in skills needed for computer interaction, such as keyboard and pointer use, navigating through menus, and scanning. To determine the validity of these measurements, we compared data on CAP reports to a Compass report. Compass software allows an evaluator for assessment of an individual's computer input skills. Results: Results of this study showed that the CAP had high internal consistency, reliability of test-retest, concurrent validity, and convergent validity. Conclusion: Therefore, the CAP is appropriate for evaluation and determination of computer access skill of persons with physical disabilities. It is possible to get clear quantitative data on performance when providing computer access services if you can use the CAP data. Using this quantitative evidence, insights can be gained into the specific nature of any difficulties experienced by persons with physical disabilities and find wise solutions.