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RAS(RFID Authtication for Serverless) 프로토콜 검증
정장영(Jang Young Chung),홍영식(Young Sik Hong) 한국정보과학회 2009 한국정보과학회 학술발표논문집 Vol.36 No.1D
Serverless 환경에서 RFID인증프로토콜의 연구가 활발히 진행되고 있다. 하지만 기존 기법들은 2단계의 프로토콜이 있어 많은 단계가 있었다. 또한 프로토콜의 절차가 단편화 되어있는 프로토콜이라도 보안성의 문제가 남아있었다. 이에 본 논문에서는 해쉬 체인을 이용한 프로토콜을 제안하고자 하며 기존 XOR기법을 이용하여 해쉬 값을 변화시키는 대신에 해쉬체인 기법을 이용하여 전방향 보안성을 높이고자 한다. 또한 리더와 태그만의 구성으로 비용을 절감하고자 하며, AVISPA를 이용하여 제안한 프로토콜의 안전성을 검증 한다.
신재영(Jae-Young Shin),박창우(Chang-Woo Park),권순홍(Sun-Hong Kwon),이상범(Sang-Beom Lee),정장영(Jang-Young Chung) 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
This study presents an experimental result of hydro-elasticity effect on slamming, Three different plates have been tested with three different deadrise angles. Hie pressure and strains were measured and analyzed for each tests. It was shown that the measured pressures and strains were affected by the thickness of the plates. Therefore the effect of hydro-elasticity must be considered when slamming analysis is carried out.
신재영(Jae-Young Shin),박창우(Chang-Woo Park),권순홍(Sun-Hong Kwon),이상범(Sang-Beom Lee),정장영(Jang-Young Chung) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
This study presents an experimental result of hydro-elasticity effect on slamming, Three different plates have been tested with three different deadrise angles. The pressure and strains were measured and analyzed for each tests. It was shown that the measured pressures and strains were affected by the thickness of the plates. Therefore the effect of hydro-elasticity must be considered when slamming analysis is carried out.
Evaluation of Critical Crack Length of Tension Bar for Continuous Ship Uploader
박건태(Keontae Park),정장영(Jang Young Chung),석창성(Chang-Sung Seok),송정일(Jung-Il Song) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.12
The CSU (continuous ship uploader) is one of the most advanced and high-tech machines among the logistics facilities. It is giant heavy equipment and has a number of driving systems compared to a general crane. In general, CSU is designed to have a life of 20 years, but recently it has been increased up to 30-50 years or is being used as a semi-permanent facility. In this study, based on the structural analysis and the elasto-plastic fracture mechanics, fracture toughness test was performed on the front tension bar, which is the main load bar of the CSU machine. The J-integral analysis was performed on the front tension bar. Based on the results of the J-integral analysis and fracture resistance test, the critical crack length without instantaneous fracture was calculated and analyzed for each operating load.
An Evaluation of Wear in High Load Long Pitch Roller Chain
김창욱(Chang Uk Kim),정장영(Jang-Young Chung),송정일(Jung Il Song) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.9
The present research investigates the wear analysis on SCM440 and SUS410 alloys for a high- load roller chain. In this wear analysis test, we concentrate on two wear factors: wear loss and coefficient of friction. For the wear test, reciprocating and block on ling analyses were used to assess the variation of wear characteristics. The applied normal loads were fixed at 10, 30, and 50 N in all tests. The test results showed that the Rockwell hardness average value of the SCM440 alloy is near 29.6 HRC, and the coefficient of friction and the wear loss are 0.62 and 3.8 mg, respectively. In addition, wear behavior was evaluated using lubricating oil.
김정숙(Jung-Sook Kim),유송헌(Song-Heon Yoo),정장영(Jang-Young Chung),정준호(June-Ho Jung),송치원(Chee-Won Song) 한국지능시스템학회 2010 한국지능시스템학회 학술발표 논문집 Vol.20 No.2
현재 국내의 소방법 의무 강화로 건설물에 방송시스템이 의무화 되었으며, 최적의 근무 환경과 편의성을 제공하기 위한 지능형 빌딩 시스템의 한 분야로 전관 방송 시스템 개발이 확대되고 있다. 본 논문에서는 기존 전관 방송 시스템에서 기능에 따라 개별적으로 분리 설치되어 운영 되던 멀티미디어 기능인 CD, MP3, 외부 입력 및 마이크 등의 오디오 방송을 일체의 장비로 통합하고 이를 소형화하여, 기존 전관 방송 시스템에 손쉽게 추가 장착할 수 있으며, 새로운 전관 방송 시스템에도 적용할 수 있는 통합 디지털 메시지 전관 방송 시스템을 설계하였다.