콩 단백질/펙틴/몬모릴로나이트 나노복합 필름의 특성 및 산소 투과도 연구

정세환,김성철,조규순,신용섭,장상희,홍기헌,이태진,신부영 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.2

In this study, Mechanical property, thermal property, watervapor, and oxygen permeability of biodegradable Soy protein/Pectin-montmorillonite nanocomposite, prepared with Na^(+)-MMT, have been studied. X-ray diffraction and TEM experiments an polymer/silicate composite samples demonstrated that the intercalation of polymer chains leads to increase in the spacing between silicate layers. In addition, it were found that the intercalated Soy protein/Pectin/montmorillonite nanocomposite were prepared. It was found that the addition of only a small of clay was enough to improve the thermal stability and mechanical property of Soy protein/Pectin/montmorillonite nanocomposite. watervapor of Soy protein/Pectin/montmorillonite nanocomposite was generally lower than that of Soy protein/Pectin. oxygen permeability of Soy protein/Pectin/montmorillonite nanocomposite was generally lower than that of Soy protein/Pectin.

탄피 각인문자 검색시스템 개발 및 Data Base 구축에 관한 연구

김동환,이정필,임세혁 內務部 國立科學搜査硏究所 2001 國立 科學 搜査 硏究所 年報 Vol.33 No.-

忠南一部 地域 靑少年의 肥滿 罹患 實態 調査 硏究

金正洙,裵世煥 公州大學校 스포츠科學硏究所 1994 스포츠科學硏究所論文集 Vol.- No.8

The purpose of this study was to analyze the prevalence rate of adolescents obesity. The number of adolescents comprised of 1000(500 boys and 500 girls) in small and medium cities in Chungnam area. The results of this survey, using Rohrer numenical index, of prevalence rate of obesity, the distribution of obesity by sexes and ages, the distribution of obesity degree, the continuum of prevalence rats of obesity, and the correlation coefficient of obesity by ages were as follows ; 1. The prevalence rate of obesity was 13.2% 2. The distribution of obesity by sexes showed that there were 60 boys(12%) and 72 girls (14.4%), so the girls were much higher than the boys. 3. The distribution of obesity by ages showed that boys of 6 years of age were 14.8%,16 years of age(13.00%), 7(12.60%), 12(12.40%), and in the case of girls, 11(15.20%), 13(14.60%), 12(14.4%) and 17(14.4%) respectively. 4. The distribution of obesity degree showed that low-overweight was 11.8%, mid-overweight 9.7%, and high-overweight, 11.8%, In the difference of obesity degree between boys and girls, the girls were much higher than the boys in mid-overweight, but was similar in low-overweight and high-overweight. 5. The continuum of prevalence rate of obesity appeared mainly at early ages, The difference between boys and girls was not large. 6. The correlation coefficient of obesity by ages was very high for the boys on 13∼14 ages and on 15∼16 ages. As for girls, it was very high on 13∼14 ages and 14∼15 ages. The results above suggested that school athletics and appropriate exercise could be useful means to prevent gradually increasing obesity from adolesecnts and we must concern about the prevalence of obesity.

가중치 특징 기반의 영상 검색 기법 연구

안세정,정성환 창원대학교 정보통신연구소 2001 精報通信論文集 Vol.5 No.-

In this paper, we proposed a weighted-feature extraction method for content-based image retrieval. At first, we extract color features using Meanvalue Color h xM-grams. For using this Meanvalue Color h xM-grams, we can give the solution of storage space and the reduction of the precessing time. Next, in addition to maintaining this space and time merit, we can extract texture features using GLCM(Gray Level Co-occurrence Matrix). By combining the color feature and the texture feature, and moreover weighting, our proposed method is more efficient than the conventional Color N×M-grams. We have compared the proposed method with Color N×M-grams using 1000 images from Corel draw Photo Album site and other universities. In the experimental results, The proposed method has some merits which are about 1/2 of processing time and 1/10 storage space respectively. Retrieval rate and Extrate rate are also improved by 6%, 19%, compared with the conventional method.

18세기 풍경식 정원과 픽쳐레스크의 화두 : WWW을 통한 경과탐색을 중심으로 Focusing on Landscape Search through WWW

조세환,정성태 경주대학교 건설환경연구소 2002 建設環境論叢 Vol.- No.4

This study was performed to understand the context of completing an outlook on picturesque nature through the subject, 'the 18th century landscape garden and the picturesque', to grasp the idea of 'Picturesque', and to develop its topic of criticizing and inheriting what epistemology has left behind The method of this study is by searching landscape architecture works of each age and understanding the landscape architects' ideas, through www, on the basic of the birth of an idea of Picturesque and its development. The study has found that the 18th century landscape garden and the picturesque is a significant topic that shows how formal view and thinking distorted experiences of nature and reconstructed it. The future study should be on the position of the picturesque theory in today's landscape design, and it's reasons.

세계화 시대에 한국농업의 경쟁력 제고방안

이정환,오세익,김수석 경상대학교 농업생명과학연구원 2002 농업생명과학연구 Vol.36 No.3

○ 우리나라의 농업, 농촌은 앞으로 DDA협상 여하에 따라 상당히 어려운 국면에 처할 것이 예상됨. 어떠한 형태로이던지 농산물 시장의 확대개방은 불가피할 것이고 이에 다라 경쟁력이 취약한 품목은 위축될 수밖에 없을 것임. 그러나 DDA협상은 기회일 수도 있음. 품질의 우수성을 앞세어 가격차별화 전략으로 일본시장을 공략할 수 있기 때문임. 이 연구는 우리 농산물의 품목별 경쟁력을 분석하고 이를 토대로 경쟁력 제고방안을 제시하기 위하여 시행되었음. ○ 분석 결과 쌀, 고추, 마늘, 감귤, 사과, 복숭아, 참깨, 쇠고기, 돼지고기 등은 내수시장에서의 경쟁력이 취약한 것으로 나타났음. 특히 마늘, 사과, 참깨, 복숭아, 쇠고기, 돼지고기 등은 관세를 부과한 후에도 국내가격보다 저렴하였음. ○ 반면에, 일본시장에서 수출경쟁력을 발휘하는 품목도 있음. 신선과채류(풋고추, 토마토, 오이, 가지), 과실류(사과, 배, 감귤), 절화류(국화, 장미, 백합), 인삼, 밤, 돼지고기 등은 품질면에서는 중국보다 우수하고 가격 면에서는 선진국보다 유리하기 때문에 우리의 전략여하에 따라 앞으로 수출량을 확대할 수도 있을것임. ○ DDA협상 후의 내수시장 경쟁력을 전망해 본 결과 쌀은 어느 정도 가능성이 있는 것으로 나타났음. 즉, 초기 관세율을 400% 내외, 감축율을 20% 이내로 축소하고, 국내산 가격을 매년 3~5%씩 절감할 수 있다면 중국쌀과 충분히 경쟁할 수 있을 것임. 앞으로 중국의 쌀값은 10% 내외, 국제미가는 30% 정도 상승할 것이 예상되어 우리 쌀의 생산비 절감, 품질제고를 통한 가격차별화, 유통의 효율화 등을 꾸준히 추진한다면 내수시장에서의 경쟁력을 확보할 수 있을 것임. ○ 그러나 쇠고기, 사과, 감귤은 가격 면에서 수입산과의 경쟁력이 취약한 것으로 분석되었음. 쇠고기는 미국산보다 60~70% 비싸고, 사과와 감귤은 중국산 및 칠레산보다 30~40% 정도 가격이 높음. 식물검역 문제로 당분간 중국으로부터의 과실수입은 금지되겠지만 2005년 이후를 대비하여 품질제고, 생산비 절감 등 경쟁력 제고대책을 신속히 마련해야 할 것임. ○ DDA협상 추진일정을 감안해 볼 때 수입개방이 본격화되는 시기는 2006년부터일 것으로 판단됨. 따라서 앞으로 남은 3년 동안 수입산 농산물과 경쟁할 대비책을 수립하여 추진해야 할 것임. 이러한 대책으로는 가격경쟁력, 품질경쟁력, 마케팅경쟁력 및 수출지원 강화 정책이 있고, DDA협상력을 제고하여 우리나라 농산물시장의 개방폭을 최대한 축소하는 것도 매우 중요함. ○ 생산비절감을 통한 가격경쟁력 제고는 한계가 있기 때문에 앞으로 가장 많은 노력과 투자가 필요한 부문은 품질경쟁력일 것임. 품질제고를 통한 브랜드화와 이를 토대로 한 가격차별화 전략은 수입 농산물과 경쟁할 수 있는 가장 효과적인 방법일 것임. 신토불이를 앞세워 우리 농산물의 우수성과 안전성을 적극 홍보하고 수입 농산물의 농약잔류, 검역문제를 철저히 감시할 것이며 원산지표시제 강력 시행 및 부정유통 단속을 강화해야 할 것임. ○ 이와 동시에 마케팅 경쟁력도 제고해야 함. 최근에는 대형소매업체가 생산자와 소비자를 직접 연결하는 신유통체계가 발전하고 있으며 이들이 차지하는 비중도 점차 증가하여 2005년에는 전체 유통량의 약 절반을 차지할 전망임. 이러한 유통업체는 대량의 농산물을 안정적으로 공급해 주기를 원하고 품질의 고급화와 신뢰성을 요구하고 있음. 따라서 생산농가, 작목반, 영농회 등 생산주체를 계열화, 조직화하여 지역별 산지유통 전문조직을 육성하며 이를 토대로 품질제고와 브랜드화에 주력해야 함. ○ 또한 틈새시장 공략전술도 유효함. 유기농축산물과 소량 생산물은 품질의 우수성과 안전성을 내세워 부유층 공략, 수출시장 개발 전략을 개발해야 함. 참깨->부유층 및 고급식당 공급, 씨감자->중국 수출, 칡분말->일본 수출 등은 좋은 예임. ○ 마지막으로, 수출지원체계를 강화하여야 함. 고품질 농산물의 수출기반을 구축하고 수출에 필요한 각종 인프라 설치 및 금융지원을 강화해야 함. 해외시장 개척, 해외시장 정보의 수집, 공급, 수출지원시스템 간의 상호연계를 통한 시너지 효과를 유도하는 것도 매우 중요함.

Effects of substrate temperature on the performance of Cu₂ZnSnSe₄ thin film solar cells fabricated by co-evaporation technique

정성훈(Jung, Sung-Hun),안세진(Ahn, Se-Jin),윤재호(Yun, Jae-Ho),곽지혜(Gwak, Ji-Hye),조아라(Cho, A-Ra),윤경훈(Yoon, Kyung-Hoon),김동환(Kim, Dong-Hwan) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11

Despite the success of Cu(In,Ga)Se₂ (CIGS) based PV technology now emerging in several industrial initiatives, concerns about the cost of In and Ga are often expressed. It is believed that the cost of those elements will eventually limit the cost reduction of this technology. One candidate to replace CIGS is Cu₂ZnSnSe₄ (CZTSe), fabricated by co-evaporation technique. Co-evaporation technique will be one of the best methods to control film composition. This type of absorber derives from the CuInSe² chalcopyrite structure by substituting half of the indium atoms with zinc and other half with tin. Energy bandgap of this material has been reported to range from 0.8eV for selenide to 1.5eV for the sulfide and large coefficient in the order of 10^{14}cm^{-1}, which means large possibility of commercial production of the most suitable absorber by using the CZTSe film. In this work, Effects of substrate temperature of Cu₂ZnSnSe₄ absorber layer on the performance of thin films solar cells were investigated. We reported on some of the absorber properties and device results.

동시진공 증발법을 이용한 Cu₂ZnSnSe₄ 박막 태양전지의 제조와 기판온도가 광전압 특성에 미치는 영향

정성훈(Jung, Sung-Hun),안세진(Ahn, Se-Jin),윤재호(Yun, Jae-Ho),곽지혜(Gwak, Ji-Hye),김동환(Kim, Dong-Hwan),윤경훈(Yoon, Kyung-Hoon) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06

Despite the success of Cu(In,Ga)Se₂ (CIGS) based PV technology now emerging in several industrial initiatives, concerns about the cost of In and Ga are often expressed. It is believed that the cost of those elements will eventually limit the cost reduction of this technology. one candidate to replace CIGS is Cu₂ZnSnSe₄ (CZTSe), fabricated by co-evaporation technique. Effects of substrate temperature of Cu₂ZnSnSe₄ absorber layer on the performance of thin films solar cells were investigated. As substrate temperature increased, the grain size of Cu₂ZnSnSe₄ films increased presumably. At a optimal condition of substrate temperature is 320?C, the solar cell shows a conversion efficiency of 1.79% with V_{OC} of 0.213V, JSC of 16.91mA/cm² and FF of 49.7%.

구강병 예방진료 일부항목의 건강보험급여를 위한 재정추계 연구

이영수,정세환,이규식 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.4

Objectives: This study aims (1) to determine the actuarial budget of national insurance payment for some items of preventive dental service and (2) to obtain basic data to develop dental policy which is for including preventive dental service within insurance payment. Methods: Pit and Fissure Sealing (PFS), Self-plaque Control Instruction (S-PCI), and Fluoride Topical Application (FTA) were selected for some items of preventive dental service. The actuarial budget of insurance payment was calculated through multiplying followings; 1) Applicable population or number of teeth (based on population data and Korean National Oral Health Survey 2000) 2) The usual and customary fee of 2001 from three dental colleges which have preventive dental clinic or RBRVS (Resource-based relative value scale) fee which was multiplied the RBRVS developed through the research of Yonsei University and conversion factor Korean Ministry of Health and Welfare had announced at 2001 as 55.4 won 3) 70% of insurer share rate 4) The utilization rate of the items of preventive dental service presumed to be at least 5% and at the most 36% Results: Actuarial budgets of 1) PFS are 18.8 billion (usual and customary fee) and 5.7 billion (RBRVS fee) for 5% utilization rate and 135.1 billion (usual and customary fee) and 41 billion (RBRVS fee) for 36% utilization rate when limited to first molar and second molar which are firstly facing teeth of 6-14 age group; 2) FTA are 2.5 billion (usual and customary fee) and 1.5 billion (RBRVS fee) for 5% utilization rate and 18.3 billion (usual and customary fee) and 10.6 billion (RBRVS fee) for 36% utilization rate when applied only to 6-14 age group annually once; 3) S-PCI are 9.1 billion usual and customary fee) and 5.5 billion (RBRVS fee) for 5% utilization rate and 65.7 billion (usual and customary fee) and 39.8 billion (RBRVS fee) for 36% utilization rate when limited over 12 age group who could have periodontal pocket. Conclusions: The actuarial budgets of PFS, FTA, and S-PCI if they were included within insurance payment system are minimum 13 billion and maximum 219 billion. It is presumed, however, that over 1,000 billion for dental treatment and the pain and time consuming from oral &ease could be decreased when dental caries and periodontal disease were prevented effectively. As a conclusion, preventive dental service should be included to the insurance payment system to decrease budget.

영상분석장치를 이용한 미세흔적의 형태비교 및 특성분석에 관한 연구(Ⅲ) : 총기 발사흔 중 강선흔의 형태 비교

박성우,이정필,김동환,임세혁,김영만 內務部 國立科學搜査硏究所 2001 國立 科學 搜査 硏究所 年報 Vol.33 No.-