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도시의 열섬현상의 개선을 위한 환경 친화조성에 관한 연구
정광호 ( Kwang Ho Chung ) 글로벌기독교세계관학회 2011 학문과기독교세계관 Vol.2 No.-
Today, with the advancement of science, a variety of attempts are being made to reduce the destructive exploitation of resources and the overconsumption of energy as well as the problems of environmental pollution. In this context, the present study explored eco-villages as ecologically-friendly communities, environment-friendly high-quality residential houses, and both domestic and foreign "build-a-village" campaigns. The results from the study are as follows: 1) Amish villages in the United States are ecological communities which seek coexistence with the natural environment by blocking the inflow of energy resources from the outside, but they are considered inferior in terms of environment-friendly technology, compared to Australia`s Crystal Waters eco-village built by a systematic and organizational plan based on the principles of eco-design. 2) Environment-friendly residential houses of high quality are desirable to live in because they are designed to least affect the environment, create a nature-friendly space, and ensure the health and comfortableness of dwellers. However, it is required to introduce technologies of ecological architecture into those houses. 3) Domestic and foreign build-a-village campaigns are mostly focused on promoting environment-friendliness through the voluntary participation of residents in eco-learning programs fit for regional characteristics and other activities such as tending kitchen gardens, creating green zones, and growing flowers. These programs need to combine more active efforts for environmental improvement with the creation of aquatic biotopes, the construction of porous pavements, the use of natural energy, and the application of ecological technologies, as well as the participation of residents in energy-resource saving and waste reduction activities. Finally, the above-mentioned efforts are considered as positive attempts to reduce urban heat island effects and make residential environments better. This study conducted as a preliminary investigation into them proposes desirable approaches to building ecological communities, and the study results suggest the need of continuous development and research activities for ecological technologies.
연구보문 : 바이오에너지 생산을 위한 헤어리베치 피복 옥수수 무경운재배 시 재식밀도와 시비량에 따른 생육 및 수량
김충국 ( Chung Guk Kim ),조현숙 ( Hyeoun Suk Cho ),전원태 ( Weon Tai Jeon ),성기영 ( Ki Yeung Seong ),정광호 ( Kwang Ho Jeong ),최봉수 ( Bong Su Choi ),조영손 ( Young Son Cho ) 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.1
This study was conducted to develop no-till cultivation system and to reduce agro-chemicals input by cut mulching of hairy vetch on corn cultivation for bio-energy production. Corn was sown with 2 planting density (71,430 and 125,000 plants ha-1) on 20 May in 2009 under no-till cultivation with cut mulching of hairy vetch. In no-till corn cultivation with cut mulching of hairy vetch, the plant height, diameter of main stem and SPAD value decreased with increasing the planting density. Ear position of corn was high and silking date of corn cultivated in cut mulching of hairy vetch was also delayed average 3 days as compared with the conventional practice, and it was associated with increasing the plant density and reducing the fertilizer application level. Moreover, dominant weeds in corn cultivation field were Persicaria blumei, Digitaria ciliaris (Retz.) Koel. and Echinochloa crusgalli, and the dry weight of weed decreased with increasing the soil cover rate of hairy vetch. Amount of the bio-ethanol production in cut mulching of hairy vetch decreased by 10.2 to 41.1% and it seemed to be associated with increasing the plant density and reducing the fertilizer application level. At no-till corn cultivation with cut mulching of hairy vetch for bio-energy production, the biomass production of combined system of reducing fertilizer application level of 50% and the planting density of 125,000 plants ha-1 would be similar to the conventional one and it could be suitable for eco-friendly bio-energy corn production.
양원호 ( Won Ho Yang ),김치년 ( Chi Nyon Kim ),김태형 ( Tae Hyeung Kim ),노영만 ( Young Man Roh ),심상효 ( Sang Hyo Sim ),원정일 ( Jung Il Won ),이채관 ( Chae Kwan Lee ),정광호 ( Kwang Ho Chung ),정지연 ( Jee Yeon Jeong ),조기홍 ( 한국산업위생학회 2013 한국산업보건학회지 Vol.23 No.2
Objectives: This study was performed in order to investigate by questionnaire the factors affecting the occupational satisfaction of work-environment measurement workers, as well as to suggest fundamental materials for systematic, administrative and economic improvements which are necessary to create a vision for the future. Material and Methods: A structured questionnaire was used at a total of 152 institutions and 1,254 work-environment measurement workers throughout the country from February to September 2012. Responses came from 97 institutions (64%) and 941 work-environment measurement workers (75.1%). The factors affecting the job satisfaction of work-environment measurement workers were statistically evaluated through χ 2 -test and ordinal logistic regression analysis. Results: Major factors affecting the job satisfaction of workers in relation to work-environment measurement were working, financial, and psychological conditions (p<0.05). Conclusions: Considering the results of this study, the improvement of labor conditions should be undertaken because workers engaged in work-environment measurement are fundamental to occupational health.
연구논문 : 신용등급과 채권수익률 내재 등급의 특성 비교
오슬아 ( Seul Ah Oh ),정광호 ( Kwang Ho Chung ) 한국금융정보학회 2015 금융정보연구 Vol.4 No.1
신용평가사는 등급의 안정성과 정확성을 위해 경기순환주기 전체를 반영하는 등급 방식을 채택하고 있다. 그러나 글로벌 금융위기 이후 국제 신용평가사의 적시성에 대한 비판의 의견이 고조되어 국제 신용평가사는 적시성 보완을 목적으로 다양한 종류의 시장가격 내재등급 활용을 강화해왔다. 해외 학계에서는 국제 신용평가사의 신용등급과 시장가격 내재 등급 간의 상호보완적 특징에 대한 연구가 활발히 이뤄져 온 반면, 국내 신용평가사는 시장가격 내재 등급의 일종인 채권수익률 내재 등급(BIR)을 신용평가 의사 결정 시 참고하여 적시성을 높이기 위한 노력을 지속하고 있으나 두 등급의 특성에 대해 분석한 국내 연구는 미미한 실정이다. 이에 본 연구에서는 안정성과 정확성 면에서의 신용등급과 BIR의 차이점에 대한 정보를 제공하고 더불어 경기순환에 따른 신용등급과 BIR의 등급변동성을 분석하고자 한다. 특성 분석에는 신용평가 성과 분석에 일반적으로 쓰이는 전이행렬, 부도율 등을 사용하였다. 분석 결과 신용등급과 BIR은 기업 신용위험에 대한 각각의 고유의 가치 있는 정보를 제공하며 상호 보완적인 특성을 가지고 있음을 확인하였다. 따라서 투자자는 신용등급의 안정성과 BIR의 적시성을 이해하고 두 등급 간의 적절한 균형점을 찾아 활용하는 것이 중요하다. Rating agencies achieve stability and accuracy by employing through-thecycle methodology. After financial crisis, global rating agencies have been criticized by slow adjusting their ratings to changes in corporate creditworthiness. They utilized market implied rating to track credit risk in a more timely manner and the study exploring the complementary characteristics of both ratings has been widely continued. On the other hand, Korean rating agencies also apply BIR, a kind of market implied rating in their rating assignments but the research analyzing characteristics of them has not been accomplished. In this paper, we give an information about the difference of credit ratings and BIR in a view of stability and accuracy. Also, we investigate the variation in accordance with the business cycle. This is the first study to research the characteristic of two ratings in Korea bond market. We used transition matrices and default probabilities to compare the differences, which rating agencies have used as general indices to measure rating performance. The results of this study suggest that both credit rating and BIR provide genuine information of their own and investors should find an optimal balance between them.
표면 분석용 Coaxial Impact Collision Ion Scattering Spectroscopy (CAICISS) 장치의 제작과 특성
김기석(Ki-Seog Kim),김용욱(Yong-Wook Kim),박노길(No-Gill Park),정광호(Kwang-Ho Jeong),황정남(Chung-Nam Whang),김성수(Sung-Soo Kim),윤희중(Hee-Jung Yun),최대선(Dae-Sun Choi) 한국진공학회(ASCT) 1994 Applied Science and Convergence Technology Vol.3 No.1
표면 분석용 CAICISS 장치를 제작하고, He^+과 Li^+이온을 사용하여 장치의 특성을 조사하였다. 장치 분해능의 평가기준으로 이용할 수 있는 △T를 정의하고 Li^+ 이온을 사용했을 경우와 비교한 결과, He^+ 이온의 경우 △T/T=0.034, Li^+ 이온의 경우 △T/T=0.04로서, Li^+ 이온의 경우가 분해능이 약간 떨어짐을 알았다. 그리고 Ta, Al 표적시료에 대한 실험결과를 보정함수를 이용하여 계산값과 비교한 결과 잘 일치함을 확인하였고, 보정함수는 입사이온의 에너지와 표적원자의 질량에는 무관하고, 실험조건에만 의존함을 알았다. 또한 Si(100) 표면에 He^+ 이온을 입사하여 입사각에 따른 산란강도 분포 스펙트럼으로부터 CAICISS 장치로 표면 1~4 원자층의 Si 원자에 대한 기하학적인 배열을 확인하였다. CAICISS system for surface analysis is constructed, and characteristics of our system are investigated using He^+ ion and Li^+ ion. We defined the △T which can be used to estimate the resolution of this system, and compared the value for the case using He^+ and that using Li^+. As a result, the △T/T is 0.034 and 0.04 for He^+ and Li^+, respectively. We also confirmed that the results of experiment for Ta, Al target atom agree well with these calculated values using a correction function, and the correction function is found to be independent of the energy of incident ion and the mass of target atom, but dependent of the experimental conditions. And we investigated the geometric structure of Si atoms from the angular scan curve for the Si(100) surface.