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정면밀링 가공 중 절삭력과 순간 절삭력 성분비를 이용한 반경방향 절입비의 실시간 추정
김명곤,권원태,Kim, Myeong-Gon,Gwon, Won-Tae 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.8
Radial immersion ratio is an important factor to determine the threshold in face milling and should be estimated in process for automatic force regulation. In this paper, presented is a method of on-line estimation of the radial immersion ratio using cutting force. When a tooth finishes sweeping, sudden drop of cutting forces occurs. This force drop is equal to the cutting force that acts on a single tooth at the swept angle of cut and can be obtained from cutting force signal in feed and cross-feed direction. The ratio of cutting forces in feed and cross-feed directions acting on the single tooth at the swept angle of cut is a function of the swept angle of cut and the ratio of radial to tangential cutting force. In the research, it is found that the ratio of radial to tangential cutting force is not affected by cutting conditions and axial rake angle. Therefore, the ratio of radial to tangential cutting force determined by just one preliminary experiment can be used regardless of the cutting conditions. Using the measured cutting force and predetermined ratio, the radial immersion ratio is estimated. Various experiments show that the radial immersion ratio and instantaneous ratio of the radial to tangential direction cutting force can be estimated very well by the proposed method.
유량 단속식 워터펌프의 연비 향상 및 배기가스 저감에 대한 실험적 연구
김명곤(Myeong Gon Gim),정정훈(Jung Hun Jung),신윤혁(Yoon Hyuk Shin),김성철(Sung Chul Kim),김현철(Hyun Chul Kim),오창복(Chang Boke Oh) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The use of the electromagnetic clutch water pump for internal combustion engine saves fuel and leads to a reduction in emissions. The clutch water pump allows the engine cooling system to select the optimum operation condition. This study investigated the effects of the diesel engine cooling system using the clutch water pump on chassis dynamometer. The electromagnetic clutch operation reduced by 49% engine warm up period at idle condition and controlled the optimum coolant temperature at driving condition. Therefore, emissions such as HC, CO and CO₂ were reduced to a certain degree and fuel consumption was also enhanced by 5.3%, compared to those of the conventional water pump with NEDC mode which represents the real driving pattern.
서광휘(Kwang Hee Seo),정혜경(Hye Kyeong Chung),김명곤(Myeong Gon Kim),정덕수(Duck Soo Chung),성낙관(Nak Kwan Sung),김옥동(Ok Dong Kim) 대한핵의학회 1993 핵의학 분자영상 Vol.27 No.1
N/A Retrospective analysis of cholescintigraphy and ultrasonography was done in 76 patients with clinically suspected acute cholecystitis to assess the relative value of the two modalities. Excluding the patients with obstructive jaundice, the overall results of cholescintigraphy(sensitivity 100%, spectificity 95%, false positive rate 5%, false negative rate 0%, accuracy 97%) are nearly identical with or rather superior to those of the ultrasonography(sensitivity 94%, specificity 100%, false positive rate 0%, false negative rate 5%, accuracy 97%). We recommend the cholescintigraphy as the initial modality in patients with clincally suspected acute cholecystitis, and ultrasonography can be used in jaundiced patients to exclude the possibility of the false positive of cholescintigraphy.