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소프트웨어 공동 개발 환경을 위한 웹 버전 관리 시스템
김수용 ( Soo-young Kim ),최동운 ( Dong-oun Choi ) 한국인터넷정보학회 2003 인터넷정보학회논문지 Vol.4 No.2
본 논문에서는 UML 편집기에서 생성된 mdl 형태의 파일을 웹 상에서 공유하기 적합한 XML 형태로 변환하여 관계형 데이터베이스에 저장하고, 각종 설계 정보들을 웹 환경에서 팀들간 공동 작업을 위해서 웹 브라우저를 통해 참조하고, 파악되도록 하기 위한 방안을 기술한다. 또한 웹 기반의 소프트웨어 공동 개발 환경에서 얻어진 많은 소스코드와 실행파일 그리고 오브젝트파일들을 프로젝트 팀들간에 공유할 수 있는 환경을 지원하는 웹 기반의 시소러스를 이용한 검색 시스템을 지원하며, 이들 설계정보들 간의 관계를 웹 상에서 유기적으로 항해할 수 있는 항해 도구 시스템에 관한 연구이다. This paper is to describe how to refer to software objects and reuse them through the web browser so that all the members of the software development team can collaborate with each other on the development procedure. In addition, we describe how to convert the *.mdl design information generated from the UML editor into their corresponding XML data, which is arranged to be saved in the relational database system. Furthermore, we provide a facet retrieval system based on which makes use of a object-oriented thesaurus, which supports an integrated environment through which all the project team members can share a lot of source codes and execution files as well as object files produced from the web-based collaborative development environment. Finally, we have designed and implemented a web version management system that facilitates software developers to manage in their web-based search for the relationship of design informations.
다중 컨텍스트 RFID 상호 인증 프로토콜의 보안 취약점 분석
김영백(Young-Back Kim),김성수(Sung-Soo Kim),정경호(Kyung-Ho Chung),김수용(Soo-Yong Kim),윤태진(Tae-Jin Yun),안광선(Kwang-Seon Ahn) 한국컴퓨터정보학회 2013 韓國컴퓨터情報學會論文誌 Vol.18 No.10
본 논문에서는 Ahn 등이 제안한 다중 컨텍스트 RFID 상호 인증 프로토콜(MCR-MAP)의 보안 취약점을 공격 시나리오를 통해 분석하고 이를 개선한 MCR-MAP을 제안한다. 제안된 프로토콜은 태그가 인증을 시도할 때 정당한 태그 ID와 서버에서 생성한 타임스탬프를 동시에 요구하도록 개선하였다. 그리고 태그가 신임장(Credential)을 생성할 때 서버와 태그가 공유하는 비밀키와 서버에서 생성한 타임스탬프를 XOR 연산한 값을 비밀키로 사용하도록 개선하였다. 이에 따라 제안된 프로토콜은 안전한 상호 인증을 제공하므로 위장 공격에 안전하며, 전방향 안전성을 제공하므로 오프라인 전수 공격에도 안전하다. 본 논문에서는 안전성 분석을 통해서 기존 프로토콜과 제안된 프로토콜의 보안 안전성을 비교 검증하였다. In this paper, we analyze the security vulnerability through the several attack scenarios for the MCR-MAP(Multi-Context RFID Mutual Authentication Protocol) proposed by Ahn et al. And we propose the secure mutual authentication protocol that improved a prior MCR-MAP. The suggested protocol uses the ID of the legal tag and the timestamp generated by the server, when the tag tries to authenticate. And when the tag creates the credential, we create the new secret key computing the XOR operation between the secret key shared with the server and the tag timestamp generated by the server. As a result, the proposed protocol provides the secure mutual authentication and then is safe to spoofing attack. Also it provides forward-secrecy and then is safe to offline brute-burst attack. In this paper, we compare and verify the security vulnerability of the prior and the proposed protocol through the security analysis.
공기포일베어링에 지지된 마이크로가스터빈의 회전체동역학적 설계
김영철(Young-Cheol Kim),한정완(Jung-Wan Han),김경웅(Kyung-Woong Kim),김수용(Soo-Yong Kim) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper presents a performance analysis of the 1st generation bump foil journal bearings. for the micro gas turbine TG75. Static performances such as load capacity and attitude angle are estimated by using soft elasto-hydrodynamic analysis technique, and dynamic performances such as stiffness and damping coefficients are estimated by perturbation method. Rotordynamic analysis for TG75 is performed by using the bearing analysis results. TG75 rotor has 2 horizontal and vertical directional natural modes due to the bearing stiffness characteristics. TG75 rotor will be stably operated between the 1st bending mode at 33000cpm and the 2nd bending mode at 85500cpm. Unbalance response analysis results satisfy the API vibration criteria.
강성준(Seong Joon Kang),김대성(Dae Sung Kim),김수용(soo Yong Kim),유수영(Soon Young Yoo),오진환(Jin Whan Oh),김기영(Kim Young Kim) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.1
Six neonates of gastric perforation between January 1986 and December 1989 were surgically treated. All perforations occurred within the first week of life. The most common symptom of the gastric perforation was sudden abdominal distention. Plain abdominal roentgenogram was most helpful to diagnose the gastric perforation. One of six patients had a round perforation thought to be stress ulcer in the pylorus and five had linear perforations, measuring 0.5~5 cm in length, in the greater curvature of the upper body. One of them had duodenal obstruction due to midgut volvulus and the other four had no definite etiology of the perforation. These five neonates except one with stress ulcer perforation showed similar histologic findings of muscular deletion in the surrounding gastric wall. Debridement and simple suture of the perforation was done in 5 patients and one had partial gastrectomy. The mortality occurred in two of six. Prematurity and low birth weight were significant factors of the mortality.