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김정인 ( Jeong In Kim ),최남현 ( Nam Hyun Choi ) 한국환경경제학회 한국자원경제학회 2005 자원·환경경제연구 Vol.14 No.2
경제적 측면에서 보았을 때 `환경산업`이라는 개념과 분류 기준은 환경재화와 서비스에 대한 규정의 어려움과 견해 차이 등으로 인해서 국가별 혹은 기관별로 상이한 모습을 보이고 있으며 기초적인 경제적 효과 분석이 제대로 되지 못하고 있다. 본 논문에서는 환경산업에 대한 경제 효과를 분석해 보기 위해서 통계청의 특수 산업 분류를 근간으로 하여 투입·산출표 내에서 환경산업을 분리해 이를 부문 통합하고, 한국은행에서 발표하고 있는 1995년과 1998년의 투입·산출표률 재구성하였다. 다음으로 투입·산출표에서 얻을 수 있는 계수와 정보를 통해서 국내 환경산업의 특성을 파악해 보고 이를 통해 환경산업의 경제적 파급 효과를 분석하여 보았다. 연구 결과 우리나라 환경산업은 전체 경제 규모에 있어서 비중 면에서는 작은 수준에 있지만 전·후방 연쇄 효과가 전체 산업에 대비해 중·상위권에 위치하고 있고 중간재적인 성격을 지닌 재화를 생산한다는 것을 알 수 있었다. 또한 가격파급 효과 부문에 있어서도 산업 대비 중·상위권의 모습을 보인다는 것을 미루어 볼 때 환경산업이 국민경제 전체에 있어서 산업간 파급 효과의 매개체 역할을 수행해 내고 있음을 알 수 있었다. From the respect of economics, environmental industry has not defined clearly since environmental services and goods are so broad to focus. Therefore many countries are using their own version of environmental industry. Hence analysis of environmental industry is very limited. In this thesis, based on the definition of Bureau Statistical Office in Korea, economic analysis for the industrial spill effect, production effect, value-added effect has been done by using 1995, 1998 I-O tables published from the Bank of Korea. Even if portion of production from environmental industry in Korea is quite low so far, forward and backward effect has quite impact on the whole industry and show strong intermediate goods. With respect to price effect.
연료전지 분리판의 형상 변화에 관한 전산해석 및 수치적 연구
남기훈(Ki-Hoon Nam),변재기(Jae-Ki Byun),최남현(Nam-Hyun Choi),최영돈(Young-Don Choi) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Fuel cells have been of great interest to mobile power industries because of their high conversion efficiency and long-period storage on charge. Among various types of fuel cells, most of technical progresses toward commercialization have been achieved on polymer-electrolyte membrane fuel cells (PEMFCs). PEMFCs, however, have been used in limited number of applications because of their high manufacturing cost, especially cost of membrane materials including precious metal catalysts (Pt or Ru). To minimize energy loss in fuel cell operation, there have been various efforts to improve cathode performance since the largest portion of the energy loss is accounted for by the cathodic polarization. In this study, we propose a wave-like design on surface of the cathode channels to improve oxidant delivery to the gas diffusion layers (GDLs).We introduced two factors AD and ER to analyze the result of improving mass transfer after changing the form of separator. This result linearized by interpolation method.
소셜 빅데이터 내용 분석 기반 사용자 그룹별 선호지역 및 이동패턴 시각화
오효정(Hyo-Jung Oh),윤보현(Bo-Hyun Yun),최남현(Nam-Hyun Choi),유철중(Cheol-Jung Yoo),김용(Yong Kim) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.12
Recently may researches using social network service for toward intelligent location-based services have been announced. This paper proposes a novel method of visualization for preferred location and moving patterns according to user groups based on contents analysis in social bigdata. Especially we collected tweet media, as known as a representative of social media, during one year and conducted preliminary investigation. We also distinguished user groups according to gender, ages, local area, and time and analyzed their preferred locations and moving pattern. Based on empirical case studies, we finally showed the effects and usages of our proposed method.
파단 열림시간과 면적에 따른 동하중 변화에 대한 민감도연구
강경호(Kyoung-Ho Kang),박현식(Hyun-Sik Park),조석(Seok Cho),최남현(Nam-Hyun Choi),배성원(Sung-Won Bae),이승욱(Seung-Wook Lee),김연식(Yeon-Sik Kim),최기용(Ki-Yong Choi),백원필(Won-Pil Baek) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Integral effect tests using the ATLAS facility were performed to investigate the blowdown load behavior during a feedwater line break accident of a steam generator. As a sensitivity study, the break opening time and the break area were varied in the tests. After the break of the feedwater line, propagation of the pressure wave along the distance from the break location inside the steam generator was clearly and pertinently observed in all the tests. As the break opening time became shorter and the broken area became larger, the dynamic pressures were measured to be significant values in the tests. Based on the present experimental data, an analysis was performed using the best-estimate thermal-hydraulic system code, MARS 3.1 with an aim of qualitatively validating the test results and also evaluating the blowdown load prediction capability of the best-estimate system code in the simulation of steam generator feedwater line break. Calculation results on overall trends of the dynamic pressure behavior were comparable with the test results which indicated a feasibility of dynamic load prediction using the MARS code.
Bubble Sizing of Two-Phase Flow using A-B-Polar Scan Mode by Ultrasonic Reflection Coefficients
Kil-Mo KOO(구길모),In-Cheol Chu(주인철),Nam-Hyun Choi(최남현),Chul-Hwa SONG(송철화),Won-Pil BAEK(백원필) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this paper, a preliminary examination for a bubble sizing technique shows that a bubble of a two-phase flow can be measured by a quantitative method using patterns of an ultrasonic reflection coefficient on a single channel mode between parameters of an ultrasonic transducer and reflection coefficients of a bubble shape. In that experiment, we also have established a PC-based UT special mode system through analysis of ultrasonic measurement principles and a basic reflection theory for a bubble sizing which can be shown A-BPolar scan mode. This system will be used to study the applications of ultrasonic semi-tomographic techniques having 8 channels as a robust non-invasive tool for direct analysis of the characteristics of multiphase flows.
오효정(Hyo-Jung Oh),배용진(Yong-Jin Bae),김현기(Hyunki Kim),최남현(Nam-Hyun Choi),윤보현(Bo-Hyun Yun) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.9
As social network service(SNS) and smart devices have propagated rapidly, many researches to analyze user preferred location information have been actively studied. Especially, there are various applications to recommend popular restaurant or tourist destination using location-based service(LBS), whereas, most of them can not reflect the users’ characteristics such as age or gender. To overcome the lack that previous works only depend on the users’ current position, this paper proposes the novel method to analyze the correlation of POI based on the user profile constructed by using the content and metadata in SNS data. Finally, several experimental results on tweets prove the usefulness of our method.