• Proceedings of the Korean Magnestics Society Conference
• /
• 2009.12a
• /
• pp.132-133
• /
• 2009

• Proceedings of the Korean Ceranic Society Conference
• /
• 2003.04a
• /
• pp.195.2-195
• /
• 2003

• Journal of Korean Association for Spatial Structures
• /
• v.14 no.4
• /
• pp.14-18
• /
• 2014

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2013.04a
• /
• pp.630-631
• /
• 2013

• Proceedings of the Korean Powder Metallurgy Institute Conference
• /
• 1996.11a
• /
• pp.29-29
• /
• 1996

• Proceedings of the Korean Magnestics Society Conference
• /
• 1992.10a
• /
• pp.48-49
• /
• 1992

• Proceedings of the Korean Society for Technology of Plasticity Conference
• /
• 2007.10a
• /
• pp.142-142
• /
• 2007

• The Transactions of the Korea Information Processing Society
• /
• v.4 no.12
• /
• pp.3150-3158
• /
• 1997

In the ATM networks, there are two method in traffic control as schemes to improve the quality of service; one is the reactive control after congestion and the other is the preventive control before congestion. The preventive control include the CAC(Connection Admission Control), the UPC(Usage Parameter Control), the NPC(Network Parameter Control) and the PC(Priority co ntrol). In this paper, we propose an efficient UPC algorithm that has a complex structure using the Jumping window algorithm within the Leaky Bucket algorithm. The proposed algorithm controls peak hit rate by the Leaky Bucket algorithm, then it does the traffic control to evaluate by the Jumping Window whether violates mean bit rate or not. As we assume On/Off traffic source model, our simulation results showed cell loss rate less than the pre-existential Leaky Bucket algorithm method, and it could decrease the demanded Bucket size.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.17 no.3
• /
• pp.403-413
• /
• 2015

This paper presents the cutter bit damage due to the rotation speed of shield TBM cutter head in the mixed ground. The efficient of cutter bits and disk cutter are very important for tunnelling in mixed ground. In particular, this research is focused on the performance of cutter bits during excavation in mixed ground which is consist of the weathered soil and rock formation. In order to carry out this research, the experimental works are prepared performed by using the scaled shield TBM cutter bits evaluation machine developed. The mixed ground is prepared considering with a scale effect of tunnel size. Three different rotation speeds of shield TBM cutter head (i.e. 2, 3, 4 rpm) are applied in the experimental work. The drag forces acting on the cutter bits are measured at each cutter bit during rotation of cutter head. It is also analysed the variation of drag forces due to the rotation speed of shield TBM cutter head. The results of this research are clearly shown that the drag forces acting on the cutter bits are jumped up at the boundary between weathered soil and rock. It is also indicated that the jamping drag forces are increased with increasing the rotation speed of the cutter head. It is found from the research that the higher rotation speed of shield TBM cutter head will be high risk in the mixed ground. It is, therefore, suggested that the use of lower rotation speed of shield TBM cutter head is recommended for reducing the cutter bit damage in practice.

• Proceedings of the Korean Institute of Industrial Safety Conference
• /
• 2003.10a
• /
• pp.351-354
• /
• 2003

최근 안전 분야에서 기능성 고분자 재료의 응용분야로서 첨단 전기전도성 고분자복합재료를 이용한 섬유상, 구형, flake 등 각종 형상의 금속, 흑연, carbon black, whisker 등의 전도성 filler를 고분자 matrix에 혼입하여 전도성 고분자를 성형가공하여 복합성형체를 제조하고 electrical hazard를 감소시키기 위한 정전기방지효과, 자기발열체, 전자기파 차폐효과 등의 특성을 나타내는 고분자 성형체상으로 가공된 소재로 화학공장, 산업설비, 각종 제조설비의 제조 공정용 제어, 과전류차단 및 외부 전자기파에 의해 발생되는 이상작동 등을 방지하는 안전시스템 소재용으로서 다양하게 사용되고 있다.(중략)