측방제트가 유도탄 공력특성에 미치는 영향 수치 연구

고범용(B.Y. GO),백연식(Y.S. Baik),이은석(E.S. Lee),이재은(J.E. Lee),허기훈(K.H. Hur) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5

A control fin is necessary for the flying object in order to satisfy its stability and maneuverability. In general, a tail is selected as a control fin and the control effectiveness of the tail is very important. Therefore, it is required to study the variables which have influence on tail performance. When side jets are located ahead of tails, the flow field around tails has interferences with side jets. So the aerodynamic characteristics of a missile with side jet is different from that of a missile without side jet. In this study, the influences of side jet on the missile aerodynamics are investigated by use of the computational fluid dynamics. The aerodynamic characteristics are found be affected by not only the free stream conditions, e.g. free stream velocity, angle of attack and bank angle but also the jet conditions, e.g. the temperature and gas property of jet.

꾸지뽕(Cudrania tricuspidata) 민간요법에 의한 약물유해반응 2예: 전격성 간염 및 급성 전신성 발진성 농포증

고범석 ( Beom Seok Koh ),박혜정 ( Hye Jung Park ),김성렬 ( Sung Ryeol Kim ),문일주 ( Il Joo Moon ),임동우 ( Dong Woo Leem ),박경희 ( Kyung Hee Park ),이재현 ( Jae Hyun Lee ),박중원 ( Jung Won Park ) 대한천식알레르기학회 2014 Allergy Asthma & Respiratory Disease Vol.2 No.5

Cudrania tricuspidata is a deciduous tree belonging to the Moraceae plant, which has been widely used as a folk remedy or health supplements in the Asian countries including Korea. As far as we know, side effects from taking the extract of C. tricuspidata has not yet been reported. We reviewed the electronic medical records of 2 patients who had adverse drug reactions to C. tricuspidata. The first case was a 30-year-old woman without a specific medical history. She was admitted with a 2-week history of jaundice and dyspepsia after taking extract of C. tricuspidata for 3 days. Initial laboratory findings were as follows: aspartate aminotransferase, 364 IU/L; alanine aminotransferase, 574 IU/L; total bilirubin, 36.3 mg/dL; and direct bilirubin, 18.3 mg/dL. She was conservatively treated for liver and renal failure while awaiting liver transplantation. However, she was expired due to combined pneumonia and progressed hepatic and renal failure. The second case was a 42-year-old woman who has chronic urticaria without other medical history. She was admitted with a 3-month history of whole body rash with small pustular vesicle after taking extract of C. tricuspidata. She was treated with intravenous steroids and antihistamines. Skin lesions were improved after 1 week. Here, we report 2 cases of adverse drug reaction to C. tricuspidata. It should be considered that C. tricuspidata ingestion could cause severe adverse drug reactions such as liver failure and acute generalized exanthematous pustulosis.(Allergy Asthma Respir Dis 2014;2:387-390)

커피전문점 서비스스케이프가 고객만족, 재방문의도, 추천의도에 미치는 영향

고범석(Ko, Beom-Seok),이수진(Lee, Su-Jin) 한국외식산업학회 2012 한국외식산업학회지 Vol.8 No.2

드론을 활용한 혼합현실 시설물 관리 시스템

고범석(Beom-Seok Go),김사웅(Sa-Ung Kim),강호산(Ho-San Kang),이종원(Jong-Won Lee),최수미(Soo-Mi Choi) 한국정보과학회 2021 한국정보과학회 학술발표논문집 Vol.2021 No.12

네트워크 기반 정보 액세스를 위한 멀티미디어 브라우저의 설계

고범석(Bum-Suk Ko),이성근(Sung-Geun Lee),황대훈(Dae-Hoon Hwang) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.2B

오늘날 정보의 중요성이 인식되면서 컴퓨터에 의한 정보처리 기술이 비약적으로 발전하고 있고, 과거의 텍스트 위주로 표현되던 정보에서 음성이나 영상 등과 같은 다양한 표현 매체를 이용한 멀티미디어 정보의 형태로 빠르게 변화하고 있다. 또한 초고속 정보통신의 발달과 함께 분산 환경의 멀티미디어 정보에 대한 사회적 요구로 인하여, 네트워크 상의 멀티미디어 정보에 대한 인지도와 이의 효율적인 검색을 지원하는 브라우저의 중요성이 증대되고 있다. 본 논문에서는 WWW 상의 정보를 검색하는 브라우저의 기능 및 구성요소를 토대로 WWW와 아울러 소규모 네트워크 환경에서도 운용이 가능한 형태의 멀티미디어 브라우저를 설계 및 검증하였다. 본 브라우저 시스템은 하이퍼텍스트를 기반으로 구축된 텍스트, 이미지, 동영상, 사운드 등과 같은 멀티미디어 혼합정보를 소규모 네트워크 환경에서의 상호 검색을 지원하도록 하므로서, 그룹웨어(groupware)의 지원이 가능한 형태로 개발되었다.

Opportunistic Beamforming 을 이용한 Spatial Multiplexing 전송 기법 및 성능 분석

고범일(Beom Il Ko),강충구(Chung Gu Kang),차용주(Yongjoo Tcha),이성춘(Seong Choon Lee) 한국통신학회 2004 한국통신학회 학술대회논문집 Vol.2004 No.11

혈관모사 마이크로채널이 장착된 3D 종양 세포 배양 시스템의 제작 및 검증 연구

박정연,고범석,김기영,이동목,윤길상,Park, Jeong-Yeon,Koh, Byum-seok,Kim, Ki-Young,Lee, Dong-Mok,Yoon, Gil-Sang 한국금형공학회 2021 한국금형공학회지 Vol.15 No.2

Recently, three-dimensional (3D) cell culture systems, which are superior to conventional two-dimensional (2D) vascular systems that mimic the in vivo environment, are being actively studied to reproduce drug responses and cell differentiation in organisms. Conventional two-dimensional cell culture methods (scaffold-based and non-scaffold-based) have a limited cell growth rate because the culture cannot supply the culture medium as consistently as microvessels. To solve this problem, we would like to propose a 3D culture system with an environment similar to living cells by continuously supplying the culture medium to the bottom of the 3D cell support. The 3D culture system is a structure in which microvascular structures are combined under a scaffold (agar, collagen, etc.) where cells can settle and grow. First, we have manufactured molds for the formation of four types of microvessel-mimicking chips: width / height ①100 ㎛ / 100 ㎛, ②100 ㎛ / 50 ㎛, ③ 150 ㎛ / 100 ㎛, and ④ 200 ㎛ / 100 ㎛. By injection molding, four types of microfluidic chips were made with GPPS (general purpose polystyrene), and a 100㎛-thick PDMS (polydimethylsiloxane) film was attached to the top of each microfluidic chip. As a result of observing the flow of the culture medium in the microchannel, it was confirmed that when the aspect ratio (height/width) of the microchannel is 1.5 or more, the fluid flows from the inlet to the outlet without a backflow phenomenon. In addition, the culture efficiency experiments of colorectal cancer cells (SW490) were performed in a 3D culture system in which PDMS films with different pore diameters (1/25/45 ㎛) were combined on a microfluidic chip. As a result, it was found that the cell growth rate increased up to 1.3 times and the cell death rate decreased by 71% as a result of the 3D culture system having a hole membrane with a diameter of 10 ㎛ or more compared to the conventional commercial. Based on the results of this study, it is possible to expand and build various 3D cell culture systems that can maximize cell culture efficiency by cell type by adjusting the shape of the microchannel, the size of the film hole, and the flow rate of the inlet.

TPE를 적용한 자동차 윈도우 모터커버의 개발

조영태,고범용,이충호,Cho, Young-Tae,Ko, Boum-Yong,Lee, Choong-Ho 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.1

It was attempted to develop an auto part by over molding injection mold that produces precision products in high productivity with use of an eco-friendly TPE substitute material for NBR. NBR is currently used in motor gear cover, one of the key parts in motor module for auto doors. Gear cover is composed of plastics and rubber mostly today, which requires a two (2) step process for production using two presses of different types. A hot press is used at this time for forming the rubber, which has drawback of requiring a rather long forming time of 400 seconds for one forming process. Even though this difficulty is overcome by reducing production time through employment of multi-cavity molds, time for forming process must be shortened for improvement of the productivity eventually, and the existing method of insert injection for products that have been formed with plastic material must be outgrown. In this point of view, over molding injection using TPE has a big advantage. Forming time is shortened to 54 seconds, and working the two (2) processes in series by one (1) press could solve the durability problem caused by deflection of the plastics, not to mention shortening the process time. Enhancement of productivity by almost 80% and improvement in the accuracy of the product could thus be achieved.

창의적 문제해결력 신장을 위한 초등학교 사회과 수업에서 학습효과에 영향을 미치는 학생변인 분석

이종연 ( Jong Yeon Lee ),구양미 ( Yang Mi Koo ),남민우 ( M. Nam ),박상훈 ( S. Park ),김병수 ( B. Kim ),박도인 ( D. Park ),서정희 ( J. Seo ),고범석 ( B. Go ),진석언 ( Suk Un Jin ) 한국교육정보미디어학회(구 한국교육정보방송학회) 2007 교육정보미디어연구 Vol.13 No.1

본 연구의 목적은 초등학생들의 사전 창의적 문제해결력, 사회과 영역지식, 메타인지, 학습동기, ICT활용능력 수준이 사회과 창의적 문제해결력 신장을 위한 교육 프로그램을 경험한 후 최종적인 창의적 문제해결력 및 사회과 학업성취도에 어떠한 영향을 미치는지 분석하여, 프로그램의 개선 및 효과적인 운영의 시사점을 도출하는 것이다. 연구대상은 서울 마포구 소재 S초등학교 5학년 5개 학급이었다. 5학년 3개 반에는 창의적 문제해결력 증진을 위한 프로그램 온·오프 연계 버전이 적용되었고, 2개 반에는 오프라인 버전이 적용되었다. 학기 시작 전, 본 연구에 참여한 학생들 모두 사전 창의적 문제해결력 검사와 사회과 영역지식 검사를 받았다. 온·오프 연계 그룹 학생들은 메타인지, 학습동기, ICT활용능력 수준을 조사하는 설문지에 응답했고, 오프라인 그룹 학생들은 메타인지, 학습동기 수준을 조사하는 설문지에 응답했다. 조사가 끝난 후, 창의적 문제해결력 증진을 위한 프로그램을 포함한 5학년 2학기 사회과 수업을 진행하였고 모든 수업을 완료한 후, 사후 창의적 문제해결력 검사와 학업성취도 검사를 받았다. 처치그룹별로 단계적 회귀분석을 실시한 결과, 온·오프 연계 버전을 운영하였을 경우, 학습자들의 사전 창의적 문제해결력과 영역지식이 사후 창의적 문제해결력과 학업성취도에 공통적으로 영향력이 있는 것으로 나타났다. 즉 사전 창의적 문제해결력 수준이 높을수록 사회과 기초지식이 많을수록 사후 창의적 문제해결력이 높았고 학업성취도도 높았다. 오프라인 버전을 운영하였을 경우, 학습자들의 영역지식 수준은 사후 창의적 문제해결력과 학업성취도에 공통적으로 영향력을 미치는 것으로 나타났고, 메타인지 수준은 사후 창의적 문제해결력 수준에 영향력이 있는 것으로 나타났다. 본 연구의 결과는 우선 사회과 창의적 문제해결력 증진을 위한 프로그램의 수업효과를 증진시키기 위해서는 버전에 관계없이 학습자의 영역지식 수준을 증진시키는 방안에 주력해야 함을 시사하고 있다. 또한 온·오프 연계 버전 적용 시 학습자의 사전 창의적 문제해결력과 영역지식 수준을 고려하는 운영방안 또는 교과과정 차별화 방안과, 오프라인 버전 적용 시 학습자의 영역지식과 메타인지 수준을 고려하는 운영방안 또는 교과과정 차별화 방안을 마련하는 것이 필요하다는 것을 알 수 있도록 한다. The purpose of this study was to analyze the effects of learners variables such as entry-level creative problem solving skills, domain-knowledge, meta-cognition, motivation, and the level of ICT use on learners` final creative problem solving skills and learning achievement in social studies after running Creative Thinker Program. Creative Thinker Program was composed of 9 units reorganized by Creative Problem Solving Model. A unique online support system was developed to assist teacher`s and students` six step activities in each unit. Five 5th grade classes from an elementary schools located in Seoul were participated in this study and they were divided into two treatment groups, on- & off-line blended treatment group and off-line treatment group. On- & off-line blended treatment meant that the online support system was fully utilized. Off-line treatment meant that most options of the system were substituted by printed materials. Stepwise multiple regression analysis showed that both students` entry-level creative problem solving skills and domain knowledge were significant predictors of final creative problem solving skills and achievement in social studies when running on- & off-line blended version of Creative Thinker Program. In case of off-line version, students` domain knowledge was a significant predictor of their final creative problem solving skills and achievement in social studies. Also students` level of meta-cognition was found to be a significant predictor of their final creative problem solving skills.

저속에서 비행하는 발사체의 Power-on 기저항력 수치적 분석

이영준(Y.J. Lee),고범용(B.Y. Go) 한국전산유체공학회 2019 한국전산유체공학회 학술대회논문집 Vol.2019 No.10