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고탄소강의 연속 건식 신선 공정에서 선재의 온도 예측 기법 개발
김영식,김동환,김병민,김민안,박용민,Kim, Yeong-Sik,Kim, Dong-Hwan,Kim, Byeong-Min,Kim, Min-An,Park, Yong-Min 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.2
Wire drawing process of the high carbon steel with a high speed is usually conducted at room temperature using a number of passes or reductions through consequently located dies. In multi-stage drawing process, temperature rise in each pass affects the mechanical properties of final product such as bend, twist and tensile strength. Also, this temperature rise during the deformation is the reason that the wire in drawing process is broken by the embrittlement due to rapid strain aging effect. This paper presents the estimation of the wire temperature for the multi-stage wire drawing process. Using the proposed calculation method of wire temperature, temperature rise at deformation zone as well as temperature drop in block considering the heat transfer between the block and wire were calculated. As these calculated wire temperatures were applied to the real industrial fields, it was known that the calculated results were in a good agreement with the measured wire temperature.
Indium Tin Oxide (ITO) 투광성 박막의 제조 및 전자파 차폐특성
김영식,전용수,김성수,Kim, Yeong-Sik,Jeon, Yong-Su,Kim, Seong-Su 한국재료학회 1999 한국재료학회지 Vol.9 No.11
투명차폐재를 목적으로 Indium Tin Oxide (ITO) 투광성 박막을 제조하고 전자파 차폐특성에 대해 조사하였다. 박막은 RF magnetron co-sputtering 증착장비를 사용하여 제작하였다. RF 인가전력, Ar 및 $O_2$분압, 기판온도를 변화시키며 전기전도도와 투광성을 겸비한 박막의 조성과 구조에 관한 실험을 진행하였다. 최적의 증착조건은 $300^{\circ}C$의 기판온도, 20sccm의 아르곤 유량, 10sccm의 산소유량, 그리고 In과 Sn의 인가전력이 각각 50W와 30W일 경우였으며, 이때 얻어진 박막은 육안으로 분명할 정도의 투광성을 보였고 5.6$\times10^4$mho/m의 높은 전기전도도를 나타내었다. 이렇게 제조된 ITO 박막의 전자파 차폐효과를 차폐이론에 의해 분석하였다. 박막의 전기전도도, 두께, skin depth로부터 차폐기구(흡수손실, 반사손실, 다중반사 보정항)에 대해 고찰하였다. 계산된 차폐효과는 26dB의 값을 보여 투광성 차폐재로 ITO 박막의 사용 가능성을 제시할 수 있었다. Indium Tin Oxide (ITO) films were fabricated by vacuum deposition technique and their microwave shielding properties were investigated for the application to the transparent shield material. The vacuum coating was conducted in a RF co-sputtering machine. The film composition and structure associated with the sputtering conditions (argon and oxygen pressure. substrate temperature. RF input power) were investigated for the attainment of high electrical conductivity and good transparency. The electrical conductivity of IT0 films fabricated under the optimum deposition conditions (substrate temperature : $300^{\circ}C$. Ar flow rate : 20 sccm, Oxygen flow rate : 10 sccm, In/Sn input power : 50/30 W) showed 5.6$\times10^4$mho/m. The optical transparency is also considerably good. The microwave shielding properties including the dominant shielding mechanism are investigated from the electrical conductivity, thickness and skin depth of the ITO films. The total shielding effectiveness is then estimated to be 26 dB, which provides a suggestion that the IT0 films can be effectively used as the transparent shield material.
HRTF를 이용한 2채널 스테레오 음원을 수정 및 편집 할 수 있는 입체음향 저작도구 개발
김영식 ( Young-sik Kim ),김용일 ( Yong-il Kim ),배명수 ( Myeong-soo Bae ),전수민 ( Su-min Jeon ),이대호 ( Dae-ho Lee ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2
컴퓨터를 이용한 가상훈련체계를 구현하는데 있어, 청각적인 요소는 시각적인 요소 다음으로 인간의 중요한 인지 능력을 담당한다. 특히 청각 능력의 향상은 훈련 시의 성과와 밀접한 관련을 가지고 있으며, 훈련 효과 향상에 기여하는 바가 높다. 본 논문에서는 이와 같은 가상훈련체계를 구축하는데 있어 반드시 필요한 음향시스템을 기존에 단순한 재생이 아닌 사용자 혹은 개발자가 필요로 하는 음원을 직접 저작할 수 있는가에 초점을 두었으며, 머리 전달함수(HRTF: Head Related Transfer Function)를 이용한 음원을 수정 및 편집하고 사용할 수 있는 시험체계를 개발하였다. 체계 성능 평가를 위하여 기능 및 청감 테스트를 실시 하였다. In implementing a computerized virtual training system, the auditory element is responsible for the human cognitive ability following visual elements. Especially, the improvement of hearing ability is closely related to the performance of the training, and it contributes to improvement of the training effect. In this paper, we propose a sound system that is necessary for constructing such a virtual training system as a test system that can use a sound source using a head related transfer function (HRTF). Functional and auditory tests were performed to evaluate system performance.
알코올 및 사염화탄소에 의해 유발된 급만성 간손상에 대한 지구자 열수추출물의 보호효과
김영식 ( Young Sik Kim ),박주연 ( Ju Yeon Park ),권용범 ( Yong Beom Kwon ),임동욱 ( Dong Wook Lim ),송미경 ( Mi Kyung Song ),최호영 ( Ho Young Choi ),김호철 ( Ho Cheol Kim ) 대한본초학회 2013 大韓本草學會誌 Vol.28 No.4
Objectives : The purpose of this study was to evaluate the hepatoprotective effect of Hovenia dulcis extract on acute and chronic liver injuries induced by alcohol and CCl4 in mice and rats. Methods : In acute alcohol-induced liver injury, mice were administered Hovenia dulcis extracts (60 and 200 mg/kg) orally before and after alcohol administration. In chronic alcohol-induced liver injury, mice were administered alcohol containing liquid diet for 4 weeks. The mice were administered H. dulcis extracts (60 and 200 mg/kg) mixed with the liquid diet. In acute CCl4-induced liver injury, rats received a single dose of CCl4 (2 mL/kg in olive oil, intraperitoneally). Rats were administered H. dulcis extracts (30, 100 and 300 mg/kg) before and after CCl4 administrations. After the ends of the administrations, the serum levels of AST and ALT were measured using chemical analyzer, and γ-GTP levels were measured using spectrophotometer. Results : In acute alcohol-induced liver injury, H. dulcis extracts treated group showed significant reduction in ALT levels compared to those of control group. In chronic alcohol-induced liver injury, it inhibited weight-loss compared to normal group and showed significant reduction in AST, ALT and γ-GTP levels compared to control group. In acute CCl4-induced liver injury, it also showed significant reduction in AST, ALT levels compared to control group. Conclusions : The results show that H. dulcis extract has hepatoprotective effect in acute and chronic alcohol-induced liver injury and acute CCl4-induced liver injury. These findings suggest that H. dulcis could be a potent hepatoprotective agent.
Wavelet 분석을 통한 시뮬레이션 음향 효과 개선에 관한 연구
김영식 ( Young-sik Kim ),김용일 ( Yong-il Kim ),배명수 ( Myeong-soo Bae ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.1
본 논문에서는 군사 훈련 및 교육에 사용될 수 있는 시뮬레이션에 사용될 수 있는 음원 파일들을 주파수 별로 분리하고 각 대역 별로 필터링해 사용하는 방법을 제안한다. 주파수 별 분리를 위해 Wavelet 분석을 통하여 주파수를 단계별로 분리하고 변환하여 각 분리된 주파수별 잡음제거를 한다. 이와 같은 작업이 이루어 질 수 있는 관련 저작도구를 구현 한다. This thesis suggests method that How sound sources used to simulation that can be used to military training and education divide each frequency and each bandwidth filtering method. method for frequency dividing and denoising are suggested into Wavelet analysis. And We materialize authoring tool about filtering that design for wavelet job