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Subdivision Mesh의 품질 향상을 위한 MDVC 알고리즘
이영건(Young-Gun Lee),김창헌(Chang-Hun Kim) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.1A
본 논문은 분할 메쉬의 품질을 향상시키기 위해 초기 메쉬의 위상을 최적화 시키는 MDVC(Modified Dynamic Vertex Connectivity) 알고리즘을 제안한다. 분할 메쉬는 초기 메쉬에 연속적인 분할 규칙이 적용된 메쉬로, 초기 메쉬의 위상에 따라 분할 메쉬의 모양과 부드러움이 좌우된다. 본 논문에서 제안하는 MDVC 알고리즘은 초기 메쉬의 위상과 aspect ratio를 개선시키므로, 기존의 분할 메쉬에서 발생하던 뒤틀림 현상을 방지할 수 있고, 초기 메쉬의 규칙점의 개수가 증가되도록 위상정보를 변경시켜 메쉬분할시 부드러움을 개선시킬 수 있다.
한(寒), 열(熱), 구속(拘束) 스트레스에 대한 사군자탕(四君子湯), 사물탕(四物湯), 육미지황탕(六味地黃湯)의 효능(效能)
강영건,이태희,Kang Young-Gun,Lee Tae-Hee 대한한의학방제학회 2002 大韓韓醫學方劑學會誌 Vol.10 No.2
In order to investigate the effect of Sagoonja-Tang, Samool-Tang and Yookmijihwang-Tang against the cold, heat and immobilization stress, each formula was injected intragastically to mice exposed to forced cold water swimming($4^{\circ}C$), forced hot water swimming($42^{\circ}C$) and immobilization stress before measuring the change of plasma corticosterone level of mice. The results were as follows: 1. One hour after each Sagoonja-Tang, Samool-Tang, Yookmijihwang-Tang with the dose of 1g/kg, 3g/kg each were administered to mice, we put cold stress($4^{\circ}C$) on mice for 3min. Then those prescriptions didn't show any significant effect on plasma corticosterone level. however, Yookmijihwang-Tang(1g/kg) showed a significant increase(p〈0.05), and Samool-Tang(3g/kg) showed a small increase. 2. One hour after Samool-Tang, Sagoonja-Tang and Yookmijihwang-Tang with the dose of 1g/kg, 3g/kg each were administerd, mice exposed to heat stress($42^{\circ}C$) for 3 min. Samool-Tang(1g/kg) and Yookmijihwang-Tang(lg/kg) showed significant decrease of corticosterone level(p〈0.01, p〈0.05) but Sagoonja-Tang didn't change it. In the case of the dose of 3g/kg, only Samool-Tang decreased corticosterone level(P〈0.01), but Sagoonja-Tang, Yookmijihwang-Tang didn't make significant effect on plasma corticosterone level of the mice exposed to heat stress($42^{\circ}C$ ). 3. Those mice which exposed to immobilization stress one hour after Sagoonja-Tang, Samool-Tang, Yookmijihwang-Tang with the dose of 1g/kg and 3g/kg didn't show effective decrease of corticosterone level. However, Sagoonja-Tang(3g/kg), Samool-Tang(lg/kg, 3g/kg) showed the effect of mild increase of corticosterone level rather than decrease. These data revealed that the effect-variation of prescriptions depended on the kinds of stress and the dose of prescriptions had a different effect on therapy.
고영건 ( Young Gun Ko ),김우겸 ( Woo Gyeom Kim ),박경태 ( Kyung Tae Park ),이종수 ( Chong Soo Lee ),신동혁 ( Dong Hyuk Shin ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.5
Strain hardening behavior of ultrafine grained (UFG) dual-phase (DP) steels via equal-channel angular pressing and subsequent intercritical annealing followed by water quenching was investigated at ambient temperature. The formation of UFG martensite islands of ~1㎛ was not confined to the prior pearlite colonies, but uniformly distributed throughout UFG ferrite matrix. Their room temperature tensile properties were examined and compared to those of coarse grained DP steels. Although uniform and total elongations were not degraded, the strengths of UFG-DP steels were much higher than that of coarse grained DP steels. In contrast to conventional UFG steels fabricated by equal-channel angular pressings, UFG-DP steels exhibited significant strain hardening rate, which was attributed to uniform distribution of island-typed martensite as well as grain refinement of each constituent phase throughout the microstructure. Such strain hardening behavior was discussed in relation to modified C-J analysis based on Swift relationship.
마이크로 아크 산화처리된 마그네슘 합금의 부식특성에 미치는 과망간산칼륨의 영향
고영건 ( Young Gun Ko ),이강민 ( Kang Min Lee ),신기룡 ( Ki Ryong Shin ),신동혁 ( Dong Hyuk Shin ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.8
The effect of potassium permanganate (KMnO4) in an electrolyte on the corrosion performance of magnesium alloy coated by micro-arc oxidation (MAO) has been investigated in this study. For this purpose, MAO coating was carried out on the present sample under AC condition in an alkaline silicate electrolyte with and without KMnO4. Irrespective of the addition of KMnO4, it was found from structural observation that the ceramic coating layers consisted of inner and outer layers. In the sample processed in the electrolyte with KMnO4, the outer layer became dense and even contained a number of Mn2O3 atoms, resulting in high corrosion resistance. Based on the results of a potentiodynamic polarization test, it was confirmed that the coating layer formed in the electrolyte with KMnO4 exhibited better corrosion resistance than that without KMnO4. The high corrosion resistance of the MAO-treated magnesium alloy was explained in relation to the equivalent circuit model.
넓은 출력 전압 범위를 갖는 위상동기루프를 위한 저전압 Charge Pump 회로 설계
부영건(Young Gun Pu),고동현(Dong Hyun Ko),김상우(Sang Woo Kim),박준성(Joon Sung Park),이강윤(Kang-Yoon Lee) 대한전자공학회 2008 電子工學會論文誌-SD (Semiconductor and devices) Vol.45 No.8
본 논문에서는 UWB PLL charge pump 의 충/방전 전류오차를 최소화하기 위한 회로를 제안하였다. Common-gate 와 Common-source 증폭기를 추가한 피드백 전압 조정기를 구성하여 높은 응답성을 가지는 charge pump를 설계하였다. 제안한 회로는 넓은 동작 영역을 갖으며, 낮은 전원 전압으로도 뛰어난 성능을 보인다. 본 회로는 1.2V 공급 전압과 IBM 0.13㎛ CMOS 공정으로 집적되었다. 설계의 효율성을 평가하기 위해 참고 논문의 다른 회로와 성능을 대조하였다. In this paper, a new circuit is proposed to minimize the charging and discharging current mismatch in charge pump for UWB PLL application. By adding a common-gate and a common-source amplifier and building the feedback voltage regulator, the high driving charge pump currents are accomplished. The proposed circuit has a wide operation voltage range, which ensures its good performance under the low power supply. The circuit has been implemented in an IBM 0.13㎛ CMOS technology with 1.2V power supply. To evaluate the design effectiveness, some comparisons have been conducted against other circuits in the literature.
고영건 ( Young Gun Ko ),이병욱 ( Byung Uk Lee ),신동혁 ( Dong Hyuk Shin ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.4
This work investigated the microstructure and mechanical properties of 6063 Al alloy fabricated by shear-drawing (SD) technique where shear and drawing strains were combined together within a predetermined die. To find the optimum condition for sound deformation, three different dies having different inner angle and diameter of the exit channel were prepared. After single deformation of the present sample, the sound deformation took place without an abrupt failure of the sample if the inner angle would be greater than 135˚ in this study, when the channel diameter of the SD die was reduced from 10 to 9 mm. Microstructural observation showed that the inner angle of 135˚ was found to be more effective than that of 150˚ in terms of the alignment of each grain to the shear direction imposed by SD method. In addition, the yield strength of the SD-deformed sample was twice higher than that of the initial counterpart while loosing ductility in tension.