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김재열(Jae-Yeol Kim),한재호(Jae-Ho Han),송결석(Kyung-Seok Song),김유홍(You-Hong Kim),김훈조(Hoon-Jo Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In process for production of Rubber Scheme Product that have the most inferior Working Environment is Medicine mixture and Scheme processing. Applying automation and Environment Treatment technology to the hazardous chemical and mixture processing, Through developed 'Mixture Automatic Machine for hazardous chemical Interruption type that is occurred at mixing rubber medicines', we try to decline worker's intensity of labour. Also, overcomes solution of work evasion phenomenon and manpower supply and demand's difficulty by forming agreeable working environment and through the automatic scheme and mixture processing by preventing that hazardous chemical had known as disease causes of various importance disease is exposed to worker during the work. and we plan to do so that production of high added value product may be available.
적외선 카메라를 이용한 용접부 안전성 평가에 관한 연구
김재열(Jae-Yeal Kim),송경석(Kyung-Seok Song),최철준(Choul-Jun Choi),김훈조(Hoon-Jo Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
RT and UT are largely used as a non-destructive assessment of welding defects. RT shows difficulty in radioactive exposure and real-time detection. UT shows difficulty in quantitative detection of defects, and examination of a wide area in a short time. In order to settle the aforementioned disadvantages, many researchers try to find solution. In this paper, we apply a new examination method to verify the effectiveness in order to supplement the disadvantages of UT and RT, the existing non-destructive methods. The new method proposed in this paper is to use a difference in heat conductivity. If there is a discontinuous part, that is an internal defect, there is a difference in heat conductivity. Using this fact, it is possible to check the existence of an internal defect due to a temperature difference on the part with a defect and the part without a defect when the welded part is heated. The temperature difference on the surface indicated by the difference in heat conductivity can be checked for a wide area within a short time, by means of a thermal image camera thereby to settle the disadvantage of the conventional non-destructive inspection methods. The thermal image method, however, has a disadvantage in that thermal load must be given to the tested sample and it is difficult to quantify measured data. In order to overcome this disadvantage, we will describe preliminary test and the like for applying thermal load on the tested sample including a welding defect, photographing images by means of a thermal image camera, analyzing thermal images, and analyzing welding defects.
클러스터 기반 센서 네트워크 수명 극대화를 위한 효율적인 에너지 공급 기법
최윤범(Yunbum Choi),김용호(Yongho Kim),조명주(Myungju Jo),김훈(Hoon Kim) 大韓電子工學會 2011 電子工學會論文誌-CI (Computer and Information) Vol.48 No.4
센서 네트워크는 향후 유비쿼터스 환경 서비스 구현을 위한 기본 인프라와 서비스 영역 정보수집 및 기기제어 등에 중요한 역할을 담당할 것으로 예상되며, 최근 센서 네트워크 기반 시스템에서의 에너지의 효율적 공급 방안에 대한 관심이 높아지고 있다. 본 논문에서는 계층적 구조 클러스터 기반 센서 네트워크에서 네트워크 생명주기를 최대로 유지하면서 클러스터 헤드에 공급되는 에너지를 최소화하는 센서 네트워크 에너지 공급 문제를 구성한다. 이 문제에 대한 해를 수학적으로 구하고 이를 기반으로 각 클러스터 헤드에 공급하는 에너지양을 결정하는 기법을 제안한다. 또한 모의실험을 통해 제안된 방식이 단순히 클러스터 헤드마다 최대 공급가능 에너지를 제공하는 것에 비해 주어진 실험 조건에서 최소 33% 이상의 에너지 절감 효과가 있음을 보였다. Sensor networks are expected to play key roles in establishment of fundamental infrastructures, information collection, and devices control to provide services for ubiquitous society in the near future, where recent issues include energy efficient energy supply scheme in the sensor network based systems has been getting more attention. This paper formulates an energy supply problem that minimizes the total energy supplied to clustered sensor networks while maintaining the network lifetime. An energy supply scheme is suggested that determines the the amount of energy supply to each cluster head based on the solution of the problem. Simulation results show that the proposed scheme achieves better energy efficiency compared with a simple scheme of maximum possible energy supply to each cluster head.
몰리브덴 팁 전계 방출 소자의 제조 및 다이아몬드 상 카본의 코팅효과
주병권,정재훈,김훈,이상조,이윤희,차균현,오명환,Ju, Byeong-Kwon,Jung, Jae-Hoon,Kim, Hoon,Lee, San-Jo,Lee, Yun-Hi,Tchah, Kyun-Hyon,Oh, Myung-Hwan 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.7
Mo-tip field emitter arrays(FEAs) were fabricated by conventional Spindt process and their life time characteristics and failure mode were evaluated. The fabricated Mo-tip FEA could generate at least $0.35\{mu} A/tip$ emission current for about 320 persistently under a constant gate bias of 140 V and was finally destroyed through self-healing mode. Thin diamond-like carbon films were coated on the M-tip by plasma-enhanced CVD and the dependence of emission properties upon the DLC thickness was investigated. By DLC coating, the turn-on voltage and emission current were appeared to be improved whereas the current fluctuation was increased in the DLC thickness range of $0~1,000\{AA}$.