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이창순 慶山大學校 1997 論文集 Vol.15 No.1
In implementation of authentication systems, the following factors should be considered : computation complexity, number of communication, amount of transferring data, amount of required memory, security, and flexibility, In our previous project, we discuss authentication systems using public key algorithm. Also we compared and analyzed previous presented protocols, then presented a Authentication System. In this paper, we implemented the above Authentication System which had been presented in our project. This work operates under the Windows 95 and introduces procedure of implementation using VC++5.0
이창순,홍성준 慶山大學校 1994 論文集 Vol.12 No.1
In this paper, we presentication and key distribution protocol which based on kryptoknight method. The presented protocol is practical in the case that handover occurs in mobile telecommunication systems. We focus on two kinds : exchanging informations with home domain and without contacting home domain.
인장 과하중이 Weldalite 049의 피로균열 전파거동에 미치는 영향
이창순 선문대학교·중소기업기술지원연구소 1998 선문공대 연구/기술 논문집 Vol.3 No.1
Weldalite 049에 인장 과하중을 가했을 때 피로균열 성장거동에 미치는 영향에 대해 조사하였다 그 결과 과하중비가 클수록, 또 정상상태에서의 피로균열 성장속도가 느릴수록 과하중에 대한 균열지체 거리 및 균열성장속도의 감소가 크게 나타났다. Weldalite 049에서는 과하중을 가함과 동시에 균열성장속도가 감소하였다가 서서히 증가하였으며, 균열지체 거리는 과하중으로 인해 균열침단에 발생한 소성역의 크기와 비슷하였으며, 과하중 전후에 균열닫힘은 거의 변하지 않았다 Weldalite 049에서는 과하중으로 균열침단에 생긴 압축 잔류응력에 의한 균열성장의 구동력의 감소가 과하중으로 인한 균열지체 현상을 지배하는 것으로 여겨진다. Effect of tensile overload on the fatigue crack propagation behavior of Weldalite 049 was investigated The results showed larger decrease in crack retardation distance and crack propagation rate as overload ratio was increased and fatigue crack propagation rate at normal state was lower In Weldalite 049 crack growth rate decreased as tensile overload was applied and increased slowly, and crack retardation distance by overload was similar to plastic zone size in front of crack tip. and crack closure did not show any significant change before/after applying overload. It is thought that the decrease in driving force for crack extension due to compressive residual stress at the crack tip resulted from overload affects the crack retardation behavior in Weldalite 049.