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공업계 고등학교 전자과 현장 실습 실태에 관한 조사 연구
박상춘(Sang Choon Park),이상혁(Sang Hyuk Lee) 대한공업교육학회 2002 대한공업교육학회지 Vol.27 No.1
The purpose of this study is to discover problems about service training of industrial in the electronic department of technical high school by investigating and analyzing the current status, to suggest an improvement plan, and to provide basic materials for efficient performance of service training of industrial. For the questionnaire survey of the research, we selected 66 teachers and 153 third year students who were in service training of industrial from the electronic department of 9 technical high schools that had the electronic department and were located in Jeollanam-do, and 75 company staffs who supervised the trainees at 21 companies that offered the training and were located in Gwangju, Seoul, and Gyeonggi-do. The results of the investigation and analysis are as follows. (1) The students, teachers, and company staffs agreed on the necessity in service training of industrial. However, it is required for them to recognize correctly that the end of service training in industrial is to practice the majoring area rather than simply to experience life in the industrial. (2) With regard to the proper period in service training of industrial, the teachers disagreed with the company staffs, but a largely accepted period was the 5˘6 months from the after midterm examination of the first semester to just before the graduation. (3) Remedy for accidents appeared still inadequate and working environments and safety education unsatisfactory. It is required to provide sufficient education for safety. (4) The students of 63.4% complained of excessive overtime work and impersonal treatment, and the company staffs of 53.3% pointed out insincere attitude of trainees such as absence and negligence as their complaint against students in service training of industrial. (5) It was found that both of the teachers and the company staffs wanted to set up sisterhood relationship with each other for service training of industrial.
김상춘(Sang Choon Kim),이용주(Yong Ju Yi),이상호(Sang Ho Lee) 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.2
In this paper, we propose an electronic election protocol based on VIOT protocol which utilizes public key cryptographic system and blind signature method to meet the security requirement in election systems. Our proposed electronic election protocol provide voter''s privacy and non-repudiation functionality which detect any misdemeanors of voters or relevant personnels.
김상춘,이용주,이상호,Kim, Sang-Choon,Yi, Yong-Ju,Lee, Sang-Ho 한국정보처리학회 2000 정보처리논문지 Vol.7 No.2
이 논문에서는 전자선거 프로토콜 중에서 무기명 비밀투표 방식에서 요구되는 안전요구사항을 만족시킬수 있도록 RSA 공개키 암호 시스템과 내용 은닉서명 기법을 이용한 VIOT 프로토콜을 이용하여 투표자의 프라이버시를 제공하고 투표자나 선거위원의 부정행위를 탐지할 수 있는 송수신 부인봉쇄 기능을 갖는 새로운 전자선거 프로토콜을 제안하였다. In this paper, we propose an electronic election protocol based on VIOT protocol which utilizes public key cryptographic system and blind signature method to meet the seccurity requirement in election systems. Our proposed electronic election protocol provide voter's privacy and non-repudiation functionality which detect any misdemeanors of voters or relevant personnels.
전체 운동가능구간에 걸쳐 함수가 정의된 6절 함수발생장치의 최적설계
이상춘,신재균,Lee, Sang-Choon,Shin, Jae-Gyun 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.12
An efficient method is proposed for the design of six-bar function generators with complex design tasks. Especially, the desired functions are defined for the entire motion ranges of the input variables. The design problem is defined as a nonlinear optimization problem. A concept of a weighted structural error is introduced for the definition of the objective function. Also simple branch identifiers are incorporated to eliminate the branch problems commonly encountered in a typical linkage synthesis problem. Two example problems of designing a Watt-II type double dwell mechanism and a Stephenson-III type double beat-up mechanism are demonstrated with numerical results. Constraints such as on the Grashof conditions and on the transmission angles are included for practical solutions.
김상춘(Sang Choon Kim),오영실(Yeong Sil Oh),이상호(Sang Ho Lee) 한국정보과학회 1999 정보과학회논문지 : 시스템 및 이론 Vol.26 No.3
이 논문에서는 송수신 부인봉쇄와 내용은닉 서명의 기본 개념과 공평한 비밀정보 교환을 위한 프로토콜인 불확정 전송 프로토콜에 대하여 소개하였다. Lein등이 제안한 검증 가능한 불확정 전송 프로토콜은 대화형 전송 방식을 사용하기 때문에 통신량이 많이 발생한다. 이러한 문제를 해결하기 위하여 M. Bellare & S. Micali가 제안한 비대화형 불확정 전송을 확장하여 믿을 수 없는 두 통신 주체간에 안전하게 비밀 정보를 전송할 수 있고, 송수신자간의 단 한번의 통신으로 이루어지는 검증 가능한 비대화형 불확정 전송 프로토콜을 제안하고, 추후 송수신 사실의 부인에 대한 문제가 발생할 경우 이를 중재할 수 있는 새로운 송수신 부인봉쇄 기능을 갖는 검증 가능한 비대화형 불확정 전송 프로토콜을 제안하고, 제안한 프로토콜에 대하여 안전성을 분석하였다. In this paper, we introduce the basic concepts of Non-repudiation of transfers and blind signatures. We also introduce oblivious transfer for the fair exchange of secret information. The verifiable oblivious transfer protocol suggested by Lein produce large amount of traffic since it is a interactive protocol. The Non-interactive oblivious transfer protocol suggested by M. Bellare & S. Micali. In this paper, we propose a new protocol which requires only one-time communication; hence, reduces the amount of traffic significantly. We also propose a non-interactive oblivious transfer protocol which can transfer secret information between two mutually non-trusted parties. This proposed protocol maybe used to verify the transferred secret information if there is a conflict between the parties involved. Finally, we analyze our proposed protocols.
Spark Plasma Sintering법에 의해 예비 성형된 Al-10Si-5Fe-1Zr 분말합금의 고온 압축변형 거동
박상춘 ( Sang Choon Park ),김목순 ( Mok Soon Kim ),김경택 ( Kyung Taek Kim ),신승용 ( Seung Young Shin ),이정근 ( Jeong Keun Lee ),류관호 ( Kwan Ho Ryu ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.11
Compressive deformation behavior of Al-10Si-5Fe-1Zr (wt%) alloy preform fabricated by SPS(spark plasma sintering) of gas atomized powder was investigated in the temperature range from 380 to 480℃ and at strain rates from 1.0×10?3 to 1.0×100 s?1. Stress-strain curves showed a peak stress (σp) during initial stage of deformation, followed by a steady state flow at all temperatures and strain rates tested. The σp decreased with both increase in temperature and decrease in strain rate. Nearly full densification was found to occur in the compressively deformed specimens irrespective of test condition. TEM observation revealed a restricted grain growth during steady state flow.