출력을 고려한 모듈 간 최적화 간격

최대원(Dae-Won Choi),최홍규(Hong-Kyoo Choi),이근무(Guen-Moo Lee),심용식(Yong-Sik Shim),최영준(Young-Jun Choi),장민기(Min-Kee Chang),김태훈(Tae-Hoon Kim) 한국조명·전기설비학회 2009 한국조명·전기설비학회 학술대회논문집 Vol.2009 No.5월

Solar photovoltaic power generation system is judging that by the most suitable new refreshing energy in real condition of our country forward continuously interest for solar photovoltaic power generation system and diffusion are enlarged. Output decline problem is item to consider necessarily and should be verified in continuous interest for solar photovoltaic power generation system and diffusion. Present plan that minimize output decline calculating module liver optimum interval that consider recitation of a poem to reduce output decline by nodule liver shade by incidence angle consideration and this that occupy most parts among factor because do output of solar photovoltaic power generation system well.

선형 선부호기를 이용한 새로운 폐루프 공간 다중화 시스템 설계

최대원 ( Dae Won Choi ),채창현 ( Chang Hyun Chae ),정태진 ( Tae Jin Jeong ) 전남대학교 전자통신기술연구소 2008 전자통신기술논문지 Vol.11 No.1

최근 2개의 송신 안테나를 사용할 경우 수신측에서 궤환되는 위상 정보로 간단한 ML (maximum likelihood) 복호를 할 수 있는 OSM (orthogonal spatial multiplexing)이 제안되었다. 그러나 이 기법은 궤환 정보를 사용하지 않는 기존의 SM (spatial multiplexing)보다 성능 측면에서 떨어지는 단점이 있다. 따라서 본 논문에서는 2개의 송수신 안테나에 대해 기존의 OSM 구조와 선부호기를 직렬 연접하여 구성된 새로운 CSM (closed-loop SM)을 제안한다. 전산 실험 결과 제안된 기법은 기존의 SM과 OSM에 비해 4-QAM에 대해서는 각각 5dB와 3dB, 그리고 16-QAM에 대해서는 각각 1dB와 3dB의 성능 향상을 보여준다. 그리고 제안된 기법에 대하여 ML 복호 성능과 거의 동일한 성능을 가지면서 더불어 수신단 복호 복잡도를 크게 줄일 수 있는 새로운 복호 알고리즘도 추가로 제안한다. Recently, a so called orthogonal spatial multiplexing (OSM) scheme was presented which allows simple maximum likelihood decoding at the receiver with single phase feedback. In this paper, by serially concatenating this scheme by a linear precoder, a new closed-loop SM scheme is proposed for two transmit and two receive antennas. By computer simulation results, we show that the proposed scheme outperforms the conventional SM and OSM. For the proposed code, we also propose a new simple decoding algorithm which leads to a greatly reduced decoding complexity compared with the ML receiver without any loss of error performance.

당산 고수부지를 활용한 도시의 성지 조성 계획

최대원(Choi, Dae-won),구영민(Koo, Young-Min) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.2

복합 스트레칭 운동이 아마추어 골프 동호인의 드라이버 비거리 및 정확성에 미치는 영향

최대원(Dae Won Choi),정성환(Sung Hoan Jung) 한국사회체육학회 2010 한국사회체육학회지 Vol.0 No.42

In this study, an amateur golf club 28(experiment group 15 and control group 13) were involved with 12 weeks of regular static and PNF stretching exercise program during the golf driver swing and evaluated head speed, deflection deviation and deflection distance. The results were followed as First, on the static and PNF stretching exercise program, there was statistically significant difference. The experimental group were getting better driver distance than the control group. Second, on the head speed, the experimental group than the control group showed a statistically significant increase. Third, on variation and deviation of the direction of the ball away than the distance and ball speed were too slow improved, but after 12 weeks the experimental group than the control group decreased significantly. As the above results, the regular static and PNF stretching exercise program during the golf driver swing would improve accuracy and distance as well as performance. More research is needed on the accuracy of the impact.

장애인올림픽대회 관련 신문의 보도경향 분석: 1988년-2012년 중심으로

최대원 ( Dae Won Choi ),윤석민 ( Seck Min Yun ) 한국특수체육학회 2012 한국특수체육학회지 Vol.20 No.4

본 연구는 1988년 제8회 서울 장애인올림픽대회부터 2012년 제14회 런던 장애인올림픽대회까지 국내 신문의 장애인올림픽과 관련된 보도 경향을 분석 하는데 그 목적이 있다. 자료 수집은 연구자를 포함한 특수체육 전공 자 4인과 신문의 보도자료 분석 경험이 있는 스포츠 마케팅 전공자 3인이 하였다. 자료수집 방법은 주저자가 조선·중앙·동아일보를 대상으로 각 신문사별로 2인씩 배분하여 총 6인이 지난 일곱 차례의 올림픽 기간 동안 발행된 전체 보도 자료를 정독한 후 개별적으로 기사내용 및 사진자료를 스크랩 하였다. 이와 같이 1차적으로 수집된 보도 자료를 토대로 동일한 7인이 참석한 전문가 회의 후 최종적으로 자료 분석에 사용할 보도 자료를 결정하였다. 수집된 자료를 토대로 보도 형태별, 성별, 장애내용별로 분석변인을 선정 후 SPSS Version 20.0을 이용하여 각 변인별 빈도수와 백분율을 산출한 결과는 다음과 같다. 첫째, 장애인올림픽 관련 총 530건의 보도 내용 중 사진 자료는 273건이고 기사 자료는 257건으로써 시진이 기사의 양보다 16건 많았다. 둘째, 남자 선수 와 관련된 보도 자료는 총 258건으로 99건의 여자 선수와 관련된 보도내용에 비해 3배 가까이 높았다. 셋째, 성 별에 따른 사진의 장애 내용 분류 결과 163건의 남자 선수 사진 중 휠체어를 사용하는 운동선수의 사진이 70건 으로 가장 많았고 절단장애선수의 사진자료는 38건으로 조사 되었다. 또한 총 60건의 여자 선수 사진 자료를 장애 구분별로 분류시 장애의 판별이 불가능한 상체 혹은 얼굴 중심의 사진자료가 33건으로 전체 여자 선수 사 진의 절반 이상으로 조사 되었으며 휠체어를 사용하는 여자 운동선수의 사진이 16건으로 조사 되었다. The purpose of this study was to analyses the newspaper coverage from the 1988 Seoul Paralympic Games to 2012 London Paralympic Games by three korean newspapers(Chosun, Joongang, and Dong-A Ilbo). All data were collected by four adapted physical education specialists and three sport management specialists. After data collection, three variables which were the form of newspaper, gender, and category of disability were selected. Collected date were analyzed using SPSS 20.0 Version to measure a frequency analysis and computing percentage. The results were as follow: First, among the 530 data, newspaper pictures(n=273) were 16 more than newspaper article(n=257). Second, the data from male athletes with disabilities were almost three times more than female athletes with disabilities. Third, among the 163 pictures from male athletes with disabilities, 70 pictures were wheelchair users and 38 pictures from amputations disorders, and among the 60 pictures from female athletes with disabilities, 33 pictures were focused on the face or upper body, which was hided their physical disabilities, and 16 pictures were wheelchair users.

Crise Financeira Global e Política Macroprudencial no Brasil

최대원 ( Choi Dae-won ) 한국포르투갈-브라질학회 2011 포르투갈-브라질 연구 Vol.8 No.1

In the aftermath of the global financial crisis of 2008-09, international financial institutions and regional multilateral banks have reviewed their approach to financial stability from microprudential to macroprudential to address systemic risks inherent in the global monetary, exchange and reserve system. Basel III has strengthened liquidity and leverage provisions with revision of microprudential framework of Basel II. Similarly, IMF and FSB have embarked on a new debate of financial regulatory framework centered on macroprudential policy. While its merits have been well documented, real effective policy tools and harmonized regulatory framewok have yet to be further elaborated. The present paper have reviewed theoretical aspects of financial regulation and attempted to make contribution to the current debate by undertaking a preliminary review of the case of Brazil on IOF- imposto sobre operações financeiras and related macroprudential measures which attracted much attention of policymakers on financial stability. Rrecurrent quantitative easing and its effect on capital inflows, carry trade and macroeconomic instability have recently led the Brazilian authority to implement enhanced macroprudential measures with capital control. While these macroprudential measures were considered endogenous to external capital flows, a close examination in this paper has revealed that the macroprudential framwork has long been embedded in the national financial system of Brazil since its late industrialization via desenvolvimentismo and integration into the international financial system to tap the foreign savings. The paper contends that the current financial crisis has induced a more systematic macroprudential measures which may suggest an exogenous macroprudential policy facing recurrent external shock. This argument has been corroborated by the latest conrtributions of BIS, IMF and FSB on countercyclical and cross-sectional policies for regulation and supervision of banking sector, capital market, shadow banking system and derivatives market for financial stability. Through a preliminary review of macroprudential policy in Brazil which became the world’s fifth or sixth largest economy, the paper contends that efforts need to be further strengthened on macrosystemic framework for global financial regulations, should the normatory parameters of financial reform be finely calibrated without giving detriment to capital account convertibility and financial innovation for capital flows and efficient resources allocation in emerging market economies.

트레드밀 운동이 노화 흰쥐 대뇌조직의 MAO-B 활성 Acetylcholine 지질과산화물 함량 및 기억력에 미치는 영향

최대원(Dae-won Choi),김유미(You-mi Kim),윤진환(Jin-hwan Yoon) 한국생활환경학회 2011 한국생활환경학회지 Vol.18 No.5

The aim of the present study was to investigate the effects of treadmill exercise on MOA-B enzyme activities Acetylcholine Lipid peroxide content and memory ability in aging rat's cerebrum. male F344 male rats (weighing 565-585 g) were used in this study. The rats were divided into three groups (n=8 in each group): the sedentary groups (Con; n=8) low intensity exercise groups (LIEG; n=8) and high intensity exercise groups (HIEG; n=8). The rats in the LIEG was force to run on a motorized treadmill at a speed of 5-8 m/min 30 min/day 4 days a week for 12 weeks. HIEG was forced to ran on motorized treadmill at a speed of 22-25 m/min 30 min/day 4 days a weeks for 12 weeks. After 12 weeks of treadmill exercise rats were tested on a step-throught passive avoidance task in order to evaluate the memory ability and than MOA-B enzyme activities acetylcholine lipid peroxide content in aging rat's cerebrum were measured. After 12 weeks treadmill exercise The MOA-B activities and MDA levels of cerebrum were significantly (p<0.05) lower in LIEG when compared to HIEG. The acetylcholin levels of cerebrum was significantly (p<0.05) higher in both LIEG and HIEG when compared to CON. Memory ability was significantly (p<0.05) increased in both LIEG and HIEG when compared to CON. Based on the present results it is suggested that long-term treadmill exercise do not cause oxidant stress in aging rat's cerebrum. These results indicate that long-term low intensity exercise play a beneficial antioxidant role and memory in reducing the lipid peroxidant enhanced by improvement of MOA-B and acetylcholin activities in the aging rat's cerebrum.

선형 선부호기를 이용한 새로운 폐루프 공간 다중화 시스템 설계

채창현(Chang-Hyeon Chae),최대원(Dae-Won Choi),정태진(Tae-Jin Jung) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.1A

일반휴가형 M<SUP>Χ</SUP>/G/I 대기행렬의 분해속성에 대한 소고

채경철(Kyung-Chul Chae),최대원(Dae-Won Choi),이호우(Ho-Woo Lee) 대한산업공학회 2002 대한산업공학회지 Vol.28 No.3

여름철 기후변화에 따른 태양광 모듈별 특성에 관한 연구

최홍규(Hong-Kyoo Choi),최신권(Shin-Gwon Choi),최대원(Dae-Won Choi),이근무(Guen-Moo Lee) 한국조명·전기설비학회 2009 조명·전기설비학회논문지 Vol.23 No.12

본 논문에서는 우리나라에서 동일한 환경에 설치되어 있는 247.5[㎾] bulk형 모듈과 a-Si형 모듈의 6월 발전량을 조사?분석하여 기상조건(일조량, 평균기온, 강수량, 운량, 풍속 등)과의 관계를 분석하고 최근 지구온난화 등으로 인한 기후변화에 따라 보다 고효율적인 모듈 산정방안을 제시하였다. In this thesis, presented module choice plan that analyze relation with weather condition (work trillion amounts, mean air temperature, precipitation, cloudiness, wind speed etc.) because diagnoses June output amount of 247.5[㎾] bulk type module and a-Si type module that is established in equal environment in our country and is the high effectiveness enemy more by climate fluctuation by latest global warming back.