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전술 Ad-hoc 네트워크에서의 효율적인 키 관리 기법
김은호,이수진,Kim, Eun-Ho,Lee, Soo-Jin 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.3
Tactical Information Communication Network(TICN) uses both a wireless and wired network. To support mobility in battlefield environments, the application of Ad-hoc networking technology to its wireless communication has been examined. However, Ad-hoc network is faced to many security threats due to its intrinsic characteristics. Therefore, to apply the Ad-hoc networking technology to battlefield environments and TICN, an intensive study on security countermeasure must go side by side with the development of enabling technology. In this paper, we suggest an efficient key management scheme for TICN of which the Ad-hoc networking technology is applied.
고강도 콘크리트의 초기강도 발현에 따른 거푸집 탈형시기의 결정
김은호 ( En Hao Jin ),김영진 ( Young Jin Kim ),한민철 ( Min Cheol Han ),신병철 ( Byoung Chul Shin ),한천구 ( Cheon Goo Han ) 한국건축시공학회 2003 한국건축시공학회 학술발표대회 논문집 Vol.3 No.1
This study discusses the determination of removal time of forms with early strength development in high strength concrete. According to the results, as W/B increases by 10%, the setting time is shortened by about 2 hours. The time when compressive strength of 8 MPa is gained is about 20 hours. Bond strength between form and concrete is highest around final setting time, but decreases drastically after that. Amount of concrete sticking on the form is large before setting, but after that, it is little. The rebound value of P type schmidt hammer is measured faster by 2~3 hours than compressive strength. It is also confirmed that the removal of forms is possible when the rebound value of P type schmidt hammer is more than 34
메탈라스로 횡구속된 고성능 콘크리트의 성능향상에 관한 기초적 연구
김은호 ( Jin¸ En-hao ),정덕우 ( Jung¸ Duk-woo ),전충근 ( Jeon¸ Chung-keun ),홍상희 ( Hong¸ Sang-hee ),한천구 ( Han¸ Cheon-goo ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
This paper is a fundamental study on the mechanical properties of the high performance concrete confined with metal lath laterally. According to the results, the compressive strength and flexural strength increases with increase of metal lath thickness due to enhancing confined force. The brittle failure is caused at maximum load in plain concrete. But, in case of concrete confined with metal lath laterally, strain stress increases a little. In flexural load curve, energy absorbtion increases with increase of metal lath thickness, so it resists continuous load, deflection and crack is retained. Length change ratio decreases with increase of metal lath thickness due to confined force.