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김곤호,김건우,김영우,최영도,김종식,김상진,한승희,홍문표 漢陽大學校 工學技術硏究所 1998 工學技術論文集 Vol.7 No.1
Abstract- In a plasma source ion implantation, the target is successively biased by negative voltage pulses with an intrinsic finite rise time, resulting in the time-dependent sheath formation around the target. Measurement of time-dependent sheath during the pulse rise show the ion matrix sheath development which is in proportion to square root of time and pulse rise rate over plasma density but independent of the ion mass.
金洪奎,金鍾根 충주대 산업과학기술연구소 2000 産業科學論文集 Vol.8 No.-
QFT(Quantitative Feedback Theory) is a very practical design technique that emphasizes the use of feedback for achieving the desired system performance tolerances in despite of plant uncertainty and disturbance. In this paper, we present an improved loop shaping approach of QFT with model validation using GA(Genetic Algorithm) and apply to a controller design problem of the gas turbine system in Gunsan C/C.
마하피닝 처리에 의한 기계구조용 합금강의 피로균열전파 지연효과
김민건,임복규,박홍기,황중각 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A
Mach peening treatment is one of the various kinds of techniques to improve the fatigue properties. The mach peening process gives high-level work hardening and compressive residual stress near the surface layer, improving the fatigue strength. In addition, this treatment reduces slip bands that initiate the fatigue cracks near the surface. During impingement, a plastic indentation surrounded by a plastic zone is formed. Mach peening treatment characteristic is less energy consumption and is an environmental friendly processing methods that is not accompanied by pollution. It is machining process that can prevent fatigue fracture beforehand in structure using already as well as process of production. The test results showed that fatigue crack propagation delay appeared by drilling type 43%, mach peening type 110%.
A-Si:H/Cd 계면층을 이용한 a-Si:H의 결정화 연구
김도영,최유신,임동건,이준신,김홍우,이수홍 성균관대학교 1997 학술회의지원논문목록집 Vol.1997 No.-
We studied the crystallization of a-SiH thin film. Multi crystallized Si fillms are preferred in many applications such as FPD, solar cells, RAM, and integrated circuits. Because most of these applications require a low temperature process, we investigated a crystallization of a-SiH using a Cd layer. A metal Cd shows an eutectic point at a temperature of 321°C. THis paper present Cd layer assisted crystallization of a-SiH film for the various grain growth parameters such as anneal temperature. Cd layer thickness and anneal time.
김상수,임동건,이준신,심경석,김홍우,이만근 성균관대학교 1997 학술회의지원논문목록집 Vol.1997 No.-
We investigated grain boundary effect for terrestrial applications of solar cells with low cost, large area, and high efficiency. Grain boundaries are known as potential barriers and recombination centers for the photo generated charge carriers, which make it difficult to achieve a high efficiency cell. To reduce these effects of grain boundarues, we investigated various influencing factors such as thermal treatments various grid patterns selective wet etchings for grain boundarues, buried contact metallizations along grain boundaries, and use of metallic thin films. From the various grid patterns we learned that the series resistance of solar cell reduced open circuit voltage and consequently decreased the cell efficiency. This paper describes the effect of various grid patterns and the employment of metallic thin films for a top electrode.
마하피닝 처리에 의한 기계구조용 합금강의 피로균열전파 지연효과
김민건,임복규,박홍기,황중각 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
Mach peening treatment is one of the various kinds of techniques to improve the fatigue properties. The mach peening process gives high-level work hardening and compressive residual stress near the surface layer, improving the fatigue strength. In addition, this treatment reduces slip bands that initiate the fatigue cracks near the surface. During impingement, a plastic indentation surrounded by a plastic zone is formed. Mach peening treatment characteristic is less energy consumption and is an environmental friendly processing methods that is not accompanied by pollution. It is machining process that can prevent fatigue fracture beforehand in structure using already as well as process of production. The test results showed that fatigue crack propagation delay appeared by drilling type 43%, mach peening type 110%.
건조 및 가공처리에 따른 Allium속 채소류의 quercetin함량
홍은영,김건희 덕성여자대학교 자연과학연구소 2007 자연과학 논문집 Vol.13 No.-
Analysis of flavonoid in Allium cepa L., Allium sativum, Allium tuberosum, and Allium victorialis var. platyphyllum at various drying methods and processing method were investigated using HPLC. Many studies reported to have the high levels of flavonoids in onion and garlic but little information for Allium tuberosum and Allium victorialis var. platyphyllumexists on their containing flavonoids. As a result of this study, four species of Allium vegatables was identified quercetin at a RT of 25.52 min, commonly. Using various drying methods, the levels of quercetin were higher in skin part (0.89mg/ml) of Allium cepa L than different parts of other Allium vegetables at air dry. Highest quercetin content of Allium cepa L. was 50.0 mg/ml and 47.5 mg/ml at 100℃ for 5min and 60℃ for 10min, respectively. In addition, the content of quercetin in the different species and portions were higher heating treats than various drying treat.
김홍겸,이건복 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
Generally, main factors of tool damage are cutting speed, feed rate and depth of cut. The increase of those factors can cause tool breakage or worsen product quality such as machining accuracy deterioration. Those three factors are concerned with cutting force. Cutting force reaches at its maximum value when cutter blade cuts away the object directly, and it is the time when tool damages are at high probability. In this study, we detect the maximum cutting force affecting tool damage and control the maximum cutting force based on the measured peak force.
김효건,최홍석,손영호,최광규 동아대학교 건설기술연구소 1999 硏究報告 Vol.23 No.2
The site responses of seismic waves were considered when in-plane P and SV waves are incident to alluvial deposit of arbitrary shape. Parametric variables such as the incident angle and the dimensionless frequency and the sheat wave velocity ratio and the mass density ratio between the half-space and the allvial deposit were selected. For numerical analysis, the inhomogeneous alluvial deposit was modeled by using 8-node isoparametric finite elements and the surrounding homogeneous linear elastic soil half-space was modeled by using 3-node isoparametric boundary elements. The two elements at the interface were coupled together with the equilibrium condition of the tractions and the compatibility condition of the displacements.