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바이오매스 합성가스를 이용한 엔진 발전 시스템의 경제성 평가
문지홍(Ji Hong Moon),이정우(Jeung Woo Lee),방병열(Byung Ryeul Bang),김세원(Se Won Kim),이은도(Uen Do Lee) 한국열환경공학회 2010 한국열환경공학회 학술대회지 Vol.2010 No.추계
Biomass, a carbon neutral fuel, is one of the fastest growing renewable energy sources. In this study, economic feasibility of small scale power generation system using syngas from biomass has been investigated. Effects of important variables such as capital investment, cost of waste wood, renewable energy certificate(REC), system marginal price(SMP) on the benefit of business have been analyzed. Internal rate of return(IRR) was predicted as 16.90%, which implicates the business is promising based on the assumptions such as SMP of 137 Won/kWh, capital cost of 4.7 billion won, and waste wood price of 30 thousand won. Major factors affecting the benefit of business are as follows; system marginal price, operational rate, capital investment, expenditure of waste wood, certified emission reduction.
철 환원법에 의한 엣칭용 염화철폐액 처리에서 볼밀에 의한 철의 재생
朴贊友,鄭又元,李萬浩,李尙昱 경북대학교 산업기술연구소 1996 産業技術硏究誌 Vol.24 No.-
We compared the regeneration effects of iron powders with ball-mill treatment at various conditions in the treatment of the waste FeCl_3 solution. And sludges formed during the reaction of Ni^2+ removal were analyzed with X - ray diffractometer and particle size analyzer.
최정우,엄원택 嶺南大學校 工業技術硏究所 1983 연구보고 Vol.11 No.1
This study is aimed at experimentally determine the process through which the digestion tank reaches normal state and its efficiency thereafter at variable detention and lapse times in treating night soil by the aerobic digestion method. Experiments are run indoor. Samples are loaded in batches and digested for 5,10,15,20 and 25 days in the tank which is continuously aerated at constant temperature, air flow and return sludge rate. The following results are noted: 1. Digestion tank reaches normal state after 9, 8.6, 5.5, 2.4 and 1.9 cycles of operation for the detention time of 5,10,15,20 and 25 days, respectively, the longer the detention time the smaller the number of cycles. 2. Protozoa which primarily occur in the aerobic digestion process somewhat differ from those observed in the activated sludge process, Oikomonas being the prevalent species in the former. 3. Waste sludge stands at 6,5 and 7% when the sample is digested for 15,20 and 25 days, respectively, which indicates reduced cost of sludge treatment. 4. Treatment efficiency of better than 99% is attained in the removal of BOD regardless of the length of digestion time when BOD is loaded at the rate of 1.7Kg/m³.day and 0.7kg/SSkgㆍday 5. Treatment efficiency of better than 95% is attained in the removal of COD(cr) regardless of the length of digestion time when COD(cr) is loaded at the rate 4.0kg/m³.day and 0.4kg/SSkgㆍday 6. Over 94% of NH₄-N is removed by the aerobic digestion process when the sample is digested for 10 to 25 days, and as much of PO₄-³ removed when digested for 10 and 15 days. 7. The optimum digestion time is 15 days, which may be reduced to 10 days.
최우정,박성은,이원찬,구준호,서영상,김태현 한국지리정보학회 2004 한국지리정보학회지 Vol.7 No.3
해수유동모델 결과를 3차원적으로 가시화하기 위한 그래픽 유저 인터페이스를 구축하는 과정에서 지리정보시스템(GIS) 기술을 활용하였다. 연안역 관리에서 GIS 기법은 산재되어 있는 방대한 자료들을 저장하고 이를 3차원으로 가시화하는 기능을 제공하며 해석적, 통계적, 모델링 도구로써 주어진 상황에 적합한 데이터 변환이 가능하도록 해준다. 해수유동모델은 개방경계에서 조석, 바람, 수온, 염분, 강물 유입 및 태양복사 등과 같은 모델입력값을 부여함으로써 구동되며 대상해역은 진해만으로 하였다. 녈 연구에서는 국산 GIS 소프트웨어인 GeoMania (v2.5)를 사용하여 진해만을 대상으로 시뮬레이션된 해수유동모델 결과의 3차원 가시화 모듈을 구축하였다. This study presents an application of GIS technologies to construct the graphic user interface for 3-dimensional exhibition of the results obtained by ocean hydrodynamic model. In coastal management studies, GIS provide a receptacle for scattered data from diverse sources and an improvement of the 3D visualization of such data. Within the frame of a GIS a variety of analytical, statistical and modeling tools can be applied to transform data and make them suitable for a given application. A 3D hydrodynamic model was driven by time-dependent external forcing such as tide, wind velocity, temperature, salinity, river discharge, and solar radiation under the open boundary condition. The Jinhae bay was selected as a case study. Here, we have used GeoMania v2. 5 GIS software and its 3D Analyst extension module to visualize hydrodynamic model result that were simulated around the Jinhae bay.
박성은,최우정,이원찬,구준호,정래홍,박종수 한국지리정보학회 2004 한국지리정보학회지 Vol.7 No.3
연안 양식어장의 정보 관리에 실용적인 지리정보시스템(GIS)을 적용함으로써 어업종사자와 연안 관리자에게 실현 가능한 관리방안을 제시하고 수산업 발전을 위한 유연한 의사결정의 기반을 마련하고자 하였다. 연안 양식어장의 효과적 관리는 경제적 실행 가능성과 운영비용에 영향을 미치며 양식 대상생물의 생산 및 사망률과도 관계가 있으므로 매우 중요하다. GIS는 양식어장 정보의 효율적인 관리도구로서 개인 및 공공분야에서 폭넓게 사용되고 있으며 해양수산 관련분야에서도 활발히 적용되고 있다 본 연구에서는 진해만을 대상으로 연안 양식장 자료의 3차원 가시화 모듈을 구축하였다. This paper illustrates some practical geographic information system (GIS) applications for aiding fishery managers and coastal area planners in analysing the likely control scheme of coastal farming areas, and in providing a flexible framework for decision making on fishery development and zoning issues. The effective management of marine farming operation is vitally important since it can greatly influence economic availability by determining capital outlay and by affecting running costs, rates of productions and mortality factors. GIS has been widely adopted elsewhere as a potent management tool in both the private and public sectors. GIS is now being extensively adopted in marine-associated activities. Here, we have used GeoMania v2. 5 GIS software and its 3D Analyst extension module to visualize marine farming areas data that were collected around the Jinhae bay.
응급실 내원 환자의 만족도 평가 및 관련 요인에 대한 연구
서강석,감신,박정배,이정헌,김종근,윤영국,곽경숙,이원기,우석정 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.4
Background: To examine the influencing factors on patients' satisfaction in the emergency department(ED) for quality assurance. Methods: Patients who visited to the ED were prospectively investigated from November 1 to December 31, 1997. Authors developed questionnaire to investigate influencing factors on patients' satisfaction. A Chi-square test and LISREL 7.0 were applied for statistical analysis. Results: Patients' satisfaction was significantly related to physical environment variables, accessibility variables, kindness of hospital personnel variables, and patient's trust for doctors variables. In path analysis, willingness for revisit was influenced by patients' satisfation, accessibility, physical environment, patients' trust for doctors in order, and willingness for recommendation was influenced by accessibility, patients' satisfaction, and kindness of hospital personnel in order. Conclusions: The influencing factors on patients' satisfaction are physical environment, accessibility, kindness of hospital personnel, and patient's trust for doctors. Willingness for revisit and willingness for recommendation are influenced by patients' satisfation. In spite of some limitations, the results of this study can be used as a baseline information for exploring the influencing factors on patients' satisfaction. Further comprehensive research efforts should be made on the study of patients' satisfactoin in the ED.