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대용량 분산 데이터 처리를 위한 Pipeline-MapReduce 모델
김선조 ( Sun Jo Kim ),김태형 ( Taehyoung Kim ),엄영익 ( Young Ik Eom ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.2
인터넷 상에서 정보량이 급격히 증가함에 따라 ISP들은 데이터를 효과적으로 처리하고 분석하기 위한 방법을 연구하고 있다. 대표적으로 Google에서는 대용량의 분산 데이터 처리 기법인 MapReduce 모델을 개발하였다. 본 논문에서는 기존 MapReduce 모델에 Pipeline 방식을 적용하여 성능을 개선한 Pipeline-MapReduce 기법을 제안한다. 그리고 실험을 통해 제안 기법이 기존 기법에 비해 빠른 처리 결과를 나타냄을 보여준다.
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광검출기 응용을 위하여 스퍼터된 미세결정 SiGe 박막성장 연구
김도영,김선조,김형준,한상윤,송준호,Kim, Do-Young,Kim, Sun-Jo,Kim, Hyung-Jun,Han, Sang-Youn,Song, Jun-Ho 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.6
For the application of photo-detector as active layer, we have studied how to deposit SiGe thin film using an independent Si target and Ge target, respectively. Both targets were synthesized by purity of 99.999%. Plasma generators were generated by radio frequency (rf, 13.56 MHz) and direct current (dc) power. When Ge and Si targets were sputtered by dc and rf power, respectively, we could observe the growth of highly crystalline Ge thin film at the temperature of $400^{\circ}C$ from the result of raman spectroscopy and X-ray diffraction method. However, SiGe thin film did not deposit above method. Inversely, we changed target position like that Ge and Si targets were sputtered by rf and dc power, respectively. Although Ge crystalline growth without Si target sputtering deteriorated considerably, the growth of SiGe thin film was observed with increase of Si dc power. SiGe thin film was evaluated as microcrystalline phase which included (111) and (220) plane by X-ray diffraction method.
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권용휘(Yong-Whee Kwon),김선조(Sun-Jo Kim),권용찬(Yong-Chan Kwon),김인환(In-Hwan Kim),임현준(HyunJune Yim) 대한기계학회 2019 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.7 No.3
우산 빗물 받이용 일회용 비닐봉투를 실질적으로 대체할 수 있도록 Air Jet를 이용한 우산의 빗물을 제거 장치를 설계하였다. 우산의 크기와 다양한 모양을 모두 사용 가능하도록 Open형 거치대에 우산의 지지대를 올려놓으면 작동되는 Touch형 스위치를 통해 작동이 용이하도록 설계하였다. 이를 위해 Water Droplet이나 Water Film에 작용하는 외력을 분석하였다. 유동장의 특성은 기본 CFD tool인 Discovery Live를 이용하여 공기 유동장 해석을 수행하였다. Air Jet Reflector는 사용자에게 물방울이 튀기지 않고 반사시키도록 설계하였으며, 그 밖에 배수구, 이동용 바퀴 등을 기본 설계안으로부터 수정하여 보완하였다. 이를 통해 친환경적 Air Jet 우산 빗물 제거기를 구현하였다. 공공 기관이 다수가 사용하는 상업 시설의 입구에 설치하면 1회용 우산 빗물 받이용 비닐의 사용을 획기적으로 감소시킬 수 있다. To practically replace disposable plastic bags for receiving rainwater from umbrellas, a rainwater removal system was designed by using an air jet blower. It was designed to be easy to operate through the touch type switch which was operated by placing the support of the umbrella on the open type holder so that the size and various shapes of the umbrella can be used. For this purpose, the external force acting on the water droplet or water film was analyzed. The flow field was analyzed using the Discovery Live, a basic CFD tool. Air Jet Reflector was designed to reflect water droplets to users, and drainage, wheels, etc. have been modified from the basic design. Through this, an eco-friendly air jet umbrella rain water removal system was developed. When installed at the entrance of commercial facilities used by many public institutions, the use of disposable umbrella rain gowns can be significantly reduced.
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기능성 식품의 활성성분 함량에 따른 기능성 보고 모델 구축
김석원(Suk Won Kim),김선조(Sun Jo Kim),Nguyen Hoang Anh,정철운(Cheol Woon Jung),권성원(Sung Won Kwon) 대한약학회 2021 약학회지 Vol.65 No.4
As the market of the functional foods is expanding to general foods, more efficient and accessible methods are required to provide quantitative and scientific evidences. In this study, we conceptualized and established a functional reporting model with logistic regression using the clinical data retrieved from the published literature. The model was validated with two active ingredients, vitamin E and lycopene. A search through PubMed using “tocopherol” or “tocotrienol” or “Vitamin E” as the keywords resulted in 45 data points corresponding to 35 studies in which the antiinflammatory efficacy of vitamin E was evaluated. The other search through PubMed using “lycopene” as a keyword resulted in 39 data points corresponding to 29 studies in which the antioxidant efficacy of lycopene was evaluated. We used C-reactive protein (CRP) or high sensitivity C-reactive protein (hs-CRP) as the inflammatory markers, and DNA damage, lipid, and protein oxidation for the measurement of antioxidant efficacy. According to our model, daily intake of at least 584.05 mg of vitamin E and 17.85 mg of lycopene is recommended to induce the functional effects. In conclusion, we anticipate that this approach to the functional report modeling would greatly expand the market of functional foods, especially for the native crops.
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