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김근배,김유,Kim, Keun-Bae,Kim, Yoo 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.2
Experimental studies of the cylindrical sintered-copper wick heat pipes were carried out to investigate the capillary heat transfer characteristics. Six models of the sintered-copper wick heat pipes were manufactured and tested to evaluate the heat transport limitations and the thermal characteristics. Also the performance of the heat pipes was analyzed theoretically and compared with the test results. The heat pipe models are divided into two sintered-wick groups and the nominal particle sizes are $180{\mu}m$(wick #1) and $200{\mu}m$(wick #2) respectively The experimental results showed that, the porosity of wick #1 was higher than that of wick #2, and also the wick #1 was generally superior than the wick #2 for the heat transport capability. The maximum heat transport rates were increased as the wick thicknesses and the vapor temperatures were increased.
김근배,김대선,이종화,박희진,위성승,Kim, Guen-Bae,Kim, Dae-Seon,Lee, Jong-Hwa,Park, Hee-Jin,Wee, Seong-Seung 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.5
Mercury contamination and its health effects have become major concern of environmental health study in Korea. Mercury exposure of some group were investigated to get the accurate data for policy making and study. About 2,000 children at 26 elementary schools participated in this survey to evaluate the exposure levels and to investigate main exposure source of mercury. Analysis of mercury levels in the whole blood and urine samples were conducted and questionnaire survey was done about the factors influencing exposures simultaneously. Mercury exposure levels of domestic children were N.D. to 17.26 ppb in blood, 0.17 to $21.67{\mu}g/g$-creatinine in urine. The mean(arithmetic) levels are 2.42 ppb in blood and $2.53{\mu}g/g$-creatinine in urine. Both of them were below the recommendation levels of US EPA and German CHBM I $5.8{\mu}g/l$ and $5{\mu}g/l$ in blood, $5{\mu}g/g$-creatinine of German CHBM I in urine. But 1%, 0.51% of levels in blood exceed the level of CHBM I and US EPA, 8%, 0.85% of children were over the level of CHBM I and CHBM II in urine. Multi-valuable regression analysis showed that the existence of road near the residence in addition to the preference for fish have significance with blood mercury exposure level of domestic children. The existence of factory near the house and the experience of dental amalgam treatment had statistical relations with urine mercury level.
루프 검출 및 예측 방법을 적용한 비용 효율적인 실시간 분기 흐름 검사 기법
김근배,안진호,강성호,Kim Gunbae,Ahn Jin-Ho,Kang Sungho 대한전자공학회 2005 電子工學會論文誌-SD (Semiconductor and devices) Vol.42 No.12
최근의 저 전력 컴퓨터 시스템은 내장 프로세서의 성능 향상과 공정 기술의 발전을 통한 디바이스 크기 감소로 인해 전압 변동, 커플링 효과 등으로 인한 SEU(single event upset)로 모델링 되는 천이고장으로 인한 예기치 못한 동작 중 에러 발생가능성이 매우 높아지고 있다. 제안하는 방식은 프로세서가 처리하는 프로그램 분기 흐름상에서 에러를 검출하는 효과적인 watchdog 프로세서 구조로서, 기존 방식이 가지는 오버헤드를 줄이면서 프로그램 내부에서 빈번히 발생되는 루프를 매번 검사할 때, 동일한 동작을 watchdog 프로세서가 반복함으로써 생기는 비효율적인 메모리 접근, 버스 점유 경쟁등과 같은 추가적인 시스템 수준의 오버헤드를 줄이는 새로운 방법을 제안하였다. 본 논문은 기존의 실시간 분기 및 제어 흐름 연구에서는 다루지 않았던 루프 검출 및 예측 기능을 추가함으로써 실제 시스템 적용에 보다 적합한 비용 효율적인 구조를 제안하고 있다. Recently, concurrent error detection for the processor becomes important. But it imposes too much overhead to adopt concurrent error detection capability on the system. In this paper, a new approach to resolve the problems of concurrent error detection is proposed. A loop detection scheme is introduced to reduce the repetitive loop iteration and memory access. To reduce the memory overheat an offset to calculate the target address of branching node is proposed. Performance evaluation shows that the new architecture has lower memory overhead and frequency of memory access than previous works. In addition, the new architecture provides the same error coverage and requires nearly constant memory size regardless of the size of the application program. Consequently, the proposed architecture can be used as an cost effective method to detect control flow errors in the commercial on the shelf products.