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이성근,이광철,이승섭,Lee, Sung-Keun,Lee, Kwang-Cheol,Lee, Seung-S. 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.11
Microlenses and microlens arrays are fabricated using a novel fabrication technology based on the exposure of a resist (usually PMMA) to deep X-rays and subsequent thermal treatment. The fabrication technology is very simple and produces microlenses and microlens arrays with good surface roughness (less than 1 nm). The molecular weight and glass transition temperature of PMMA is reduced when it is irradiated with deep X-rays. The microlenses is produced through the effects of volume change, surface tension, and reflow during thermal treatment of irradiated PMMA. The geometry of the microlens is determined by parameters such as the X-ray dose applied to the PMMA, the diameter of the microlens, along with the heating temperature, heating time, and cooling rate in the thermal treatment. Microlenses are produced with diameters ranging from 30 to 1500 ${\mu}{\textrm}{m}$. The modified LIGA process is used not only to construct hemispherical microlenses but also structures that are rectangular-shaped, star-shaped, etc.
이홍찬(H. C. Lee),장지호(J. Chang),조영래(Y.R. Cho),이상태(S.T. Lee),오진석(J.S. Oh),이성근(S.G. Lee),김윤식(Y.S. Kim),K. Ando 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
In this paper, in order to utilize efficient green emission property (Te-cluster emission) in visible light emitting devices (LEDs and LDs), the characteristics of ternary compounds (ZnSSe:Te) have been stuided, focussing on the control of the lattice-matched condition. Efficient and long-lived green LEDs using Te-cluster emission band at room temperature were successfully fabricated. The lifetime characteristics of the ZnSSe:Te-based DH-LEDs shows above 1,500 ills operated at 3 A/㎠.
불완전한 이차원 다양체 모델에서의 공구경로 생성을 위한 효과적인 모서리와 꼭지점 옵셋
이성근(S.G. Lee),양민양(M.Y. Yang),이동윤(D.Y. Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
When geometric data is transferred from one system to another system and tessellated for tool-path generation, the transferred model is commonly represented as an incomplete 2-manifold model which does not have any topological data between surfaces. By the way, there are some problems in generating tool-path with an incomplete 2-manifold model. One of them is to find the relation between surfaces and to offset nonoverlapped edges and vertices of those surfaces. Therefore, this paper presents the efficient edge and vertex offset method using collision determination, relation of sets and surface mapping.
배구경기(排球競技) 내용(內容)에 관(關)한 비교(比較) 연구(硏究)(Ⅰ)
李成根(S.K.Lee),崔永根(Y.K.Choi) 한국체육학회 1974 한국체육학회지 Vol.9 No.-
1. The teams particpated for the 2nd Nationwide Professional Valley Ball in 19732. The Japanese team that was invited to Korea on October 27, 1973 and Korean National teampertaining to their Serve, Spike and Receive. in including the above mentioned varios teams.1) The successfull ratio of male teams of serve were :Male Pro. team. 1.64%Korean National Team-1.15%Japanese National Team-1.15%Female Pro. Team-1.60%*The ratio of failures were :Male Pro. Team-3.10%Korean National Team-1.01%Japanese National Team-5.74%Female Pro. Team-3.20%2) The successfull ratio of receiving of the serve, were :Male Pro.-98.50%Korean National Team-98.78%Japanese National Team-97.96%Female Pro. Team-97.80%3) The successful ratio of A QuickMale Pro. Team-50.47%Korean National Team-40.00%Japanese National Team-27.27%Female Pro. Team-55.69%*The Ratio of failures :Male Pro.-18.5%Japanese National Team-9.09%Female Pro. Team-13.91%Korean National Team-was exception, non-failure.4) The successful ratio of B Quick.Male Pro. Team-56.27%Korean National Team-75.00%Japanese National Team-47.03%Female Pro. Team-47.30%*The Ratio of failures were :Male Pro.-19.45%Korean National Team-8.33%Japanese National Team-25.00%Female Pro. Team-10.14%5) The successful Ratio of Time-interval spikes were :Male Pro. Team-47.28%Korean National Team-45.45%Japanese National Team-50.00%Female Pro. Team-41.25%*The Ratio of failures wereMale Pro. Team-18.30%Korean National Team-18.19%Japanese National Team-30.00%Female Pro. Team-13.28%6) The Ratio of Open Spikes wereMale Pro. Team-42.15%Korean National Team-34.21%Japanese National Team-37.96%Female Pro. Team-28.59%*The Ratio of failures was;Male Pro. Team-21.84%Korean National Team-23.68%Japanese National Team-27.77%Female Pro. Team-11.08%7) The second step Spikes were;Male Pro. Team-81.88% successful and failure 28.84%Korean National Team-62.5% successfulFamale Pro. Team-33.33 successful and 22.03% failureJapanese rational Team-had not attach at all8) The Ratio of success in receiving from the spikes of open and time-interval during the A Quick and B Quick were;Male Pro. Team-60.34%Korean National Team-100%Japanese National Team-55.55%Female Pro. Team-80.76%9) The Ratio of successful receiveing in the second step spikes were ;Male Pro. Team-60.34%Korean National Team-100%Japanese National Team-55.55%Female Pro. Team-80.76%10) The Ratio of successful receive from the Direct Spikes were ;Male Pro. Team-16.66%Korean National Team-66.67%Female Pro. Team-81.81%11) The Ratio of Successful Receive from the Faint Spikes were;Male Pro. Team-58.61%Korean National Team-83.33%Japanese National Team-50.00%Female Pro. Team-71.70%12) The Ratio of Success of Indivudual Breakings were;Male Pro. Team-15.38%Korean National Team-20%Female Pro. Team-11.27%13) Net Touch were;Male Pro. Team 23.33% in the Spike and 76.67% in the Receive.Female Pro. Team-43.55% in the spike and 56.34% in Receive.
이성근(S.G.Lee) 한국해양대학교 해사산업연구소 1998 海事産業硏究所論文集 Vol.8 No.-
In this thesis, a speed control algorithm using the observer is proposed for the high performance speed control of a 3-phase induction motor driven by a voltage source inverter. The proposed system becomes robust against disturbances by means of a feed-forward control of the load disturbance component estimated by the load disturbance observer. And also, for better estimation, we added phase compensator to the observer. Computer simulations and experimental works which compared proposed algorithm with the conventional PI control method showed that transient response for the variation of load torque becomes improved.