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A Study on the Auto Fuel Feeding Control System using Hall Sensor
김규성,조명현,Kim, Gyu-Sung,Cho, Myung-Hyun The Institute of Electronics and Information Engin 2006 電子工學會論文誌. Journal of the institute of electronics Vol.43 No.3
일반적으로 유체나 연료 공급 장치는 모터를 제어하기 위한 특별한 센서가 필요하고, 센서를 부착하기 위한 보조 장치와 부착하기 위한 공간이 필요하다. 또한 신호선 및 기타 배선 등이 필요하여 어려운 점이 따르게 된다. 본 논문에서는, 불편함과 문제점을 해결하기 위하여 홀센서를 이용한 제어시스템을 제안하였고, 시스템의 제어원리는 모터 동작 단계에 따라 전류흐름에 차이가 발생한다는 것을 이용하였다. 또한 제어 시스템이 우수할 뿐만 아니라 센서 설치에 따른 고장을 줄일 수 있었고, 재료비 및 인건비를 절감할 수 있다. Auto-Pumping 시스템은 Soft-Ware적응용을 통해 모든 유체 공급 시스템에 적용할 수 있으며, 차후에 시스템을 이용한 여러 종류의 장치를 개발할 수 있으리라 본다. Usually, fluid or fuel supply device need space to need special sensor to control motor, attaches with ancillary equipment to attach sensor. Also, difficult point follows need signal line and other circuit etc. In this paper, used that proposed control system that use hall sensor to solve discomfort and problem and difference control principle of system happens in current flow according to motor action step. Also, could reduce breakdown by sensor establishment, reduce material costs and personnel expenses as well as control system superior. Auto-pumping system sees that will can apply, develop several kind of device that use system hereafter to all fluid supply systems through soft-ware adaptation.
김규성(Gyu-Sung Kim),정준모(Joon-Mo Choung),장영식(Young-Sik Jang),최익홍(Ick-Hung Choe),이준희(Joon-Hee Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This paper presents static and dynamic measurement of the stress and motion characteristics for crawler<br/> type excavators. Eight scenarios were prepared for static measurement based on two extreme digging<br/> positions, maximum digging reach position and maximum digging force position. The measured items for<br/> static motion included stress, cylinder pressure, cylinder stroke and digging force. The measured static<br/> stresses showed that asymmetric digging force acting on a bucket induced higher stress level than symmetric<br/> one. The measured static pressures and digging forces also agreed with design pressures and design digging<br/> forces, respectively. The dynamic measurement was performed for two types of motion, that is, simple<br/> reciprocation of each cylinder and actual digging motion. The measured items for dynamic motion were<br/> stroke and pressure of each cylinder, stresses on the working device and acceleration on the upper plate of an<br/> arm. The measured data showed that the natural frequency of the excavator highly depended on the hydraulic<br/> stiffness of cylinders. Digging motion tests revealed that digging motion was closer to static motion rather<br/> than dynamic one.
5 ㎝ 이하의 간세포암에 대한 제한적 간절제술과 대량간절제술후 결과 및 장기 생존율 비교
김혜진(Hye Jin Kim),황윤진(Yoon Jin Hwang),김종렬(Jong Yeol Kim),권형준(Hyung Jun Kwon),김규성(Gyu Sung Kim),천재민(Jae Min Chun),김상걸(Sang Geol Kim),윤영국(Young Kook Yun) 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.78 No.1
Purpose: Though major hepatic resections including hemihepatectomy, trisectionectomy, and central bisectionectomy are most commonly employed for small (<5 ㎝) hepatocellular carcinoma (HCC), limited hepatic resection is indicated in some HCC patients with impaired liver function, poor physical condition, or tumors peripherally located. We compared the clinicopathological features and long-term survival between the patients who underwent major resection and limited resection. Methods: From January 1998 to May 2007, 223 patients who underwent hepatic resection for small HCC were enrolled. 123 patients underwent limited resection and 100 patients underwent major resection. Clinocopathologic features, overall, and disease-free survival were compared between both groups. Results: The limited resection group had lower mean serum albumin levels (3.86±0.41 vs. 4.11±3.61, P<0.0001) and higher mean ICG R15 (12.66±0.87 vs. 7.51±4.33, P<0.0001). Patients with esophageal varix and liver cirrhosis were more common in the limited resection group (34.1% and 73.1% versus 9% and 45% respectively). Morbidity and mortality were not different in both groups. Overall 1-, 3-, 5-year survivals in both limited resection and major resection groups were 89.4%, 77.3%, 43.8% and 87.8%, 76.5%, 62.1% respectively (P=0.161) and 1-, 3-, 5-year disease free survivals were 80.2%, 50.2%, 38.6% and 79.9%, 63.2%, 50.4% respectively (P=0.10). Conclusion: Despite indifference of overall and disease-free 5-year survival rates between limited and major resection groups, careful follow up is essential to detect late recurrence in the limited resection group, since limited resection tends to have more frequent recurrence, especially 2 years after surgery.
A Study on the Semi-conductor Package Process Epoxy Moulding Compound Gun
조명현,김규성,Cho, Myung-Hyun,Kim, Gyu-Sung The Institute of Electronics and Information Engin 2006 電子工學會論文誌. Journal of the institute of electronics Vol.43 No.4
EMC를 정량 Moulding 후 잔량 처리와 작동 시 역 차단 방식의 설계하여 기계적 동작에 의해 흡입이 일어나도록 하여 Needle Tip의 잔량과 사인 현상을 해결하였다. 본 논문에서는 Gun과 세척제 Tank를 직결하도록 설계하여 세척이 용이하며, 원하는 량을 미리 계량하여 정밀 정량을 고속으로 EMC를 Molding 할 수 있도록 개발하기 때문에 반도체 Packaging 공정에 필수적인 장비라고 사료된다. EMC(epoxy moulding compound) when operate with residual quantity processing after fixed quantity moulding inverse close way of designing by mechanical action inhalation so that may occur, solved of needle tip residual quantity and cause of thread extend phenomenon. In this paper, design to connect directly gun, washer tank and measuring beforehand amount that washing is easy and want minuteness fixed quantity that essential equipment in semi-conductor packaging process because develop EMC so that can molding with high speed consider.
수중 폭발 충격을 받는 잠수함 액화 산소 탱크의 구조-유체 연성 해석
신형철(Hyung-Cheol Shin),김규성(Jae-Hyun Kim),김재현(Gyu-Sung Kim),전재황(Jae-Hwang Jeon) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
We performed the underwater explosion analysis for the liquefied oxygen tank - a kind of fuel tank of a mid-size submarine. and tried to verify the structural safety for this structure. First. we reviewed the theory and application of underwater explosion analysis using Structure-Fluid Interaction technique and its finite element modeling scheme. Next. we modeled the explosive and sea water as fluid clements. the LOX tank as structural elements and the interface between two regions as ALE scheme. The effect on shock pressure and impulse of fluid mesh size and shape are also investigated. As the analysis result. the shock pressure due to explosion propagated into the water region and hit the structure region. The plastic deformation and the equivalent stress highly appeared at the web frame und the shock mount of LOX structure hut these values were acceptable for design criteria.