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      • KCI등재

        바이오가스 생산시설의 비용 편익 사례 분석

        윤영만,박현태,김연중,한혜성 한국농촌경제연구원 2012 농촌경제 Vol.35 No.4

        This study conducted a case study analyzing the cost and benefits of biogas plants that use livestock manure to produce biogas. The purpose was to review the possibility of expanding the facilities across the country. According to the analysis results, it was found that in most cases economic viability would be very low if the revenue is earned through the selling of surplus electricity only. If we consider the sales revenue from surplus power as the direct benefit (Scenario 1), the compensation rate would be 24.8% of total facility cost. However, in Scenario 2 where we consider private investment as the only cost, the compensation rate would be 34.0% of the total cost. It was found that if indirect benefit is taken into account, only the biogas facility in Jeju Island would generate an economic benefit of 381 won/㎥. In the cost analysis of private investment, it was estimated that the economic benefit of the biogas plants would be 2,565~4,809 won/㎥, that is, excluding two plants in Suncheon and Changnyeong that are built with private investment only and another two plants in Anseong that are built for experimental purpose only. Therefore, in order to improve the economic viability of manure biogas plants, government support is needed more than anything else to share the initial facility cost.

      • KCI등재

        교량에 설치된 도시가스배관의 안전관리에 관한 연구

        윤영만,손상근,최도균,이수경 한국가스학회 2018 한국가스학회지 Vol.22 No.1

        이 논문에서는 도시가스 배관 중 교량에 설치된 배관 398개소에 대해 현황을 조사하고, 배관을 설치연도별, 길이별, 원격차단장치 설치여부 등 특성별로 분류하여 분석하였다. 분석결과 20년 이상 장기사용배관이 43.0% 를 차지하고 있었고, 원격차단장치 미설치 교량배관은 89.4%에 달하는 등 드러난 현상에 대한 안전관리 방안을제시하였다. 또한 조사된 교량설치 배관 중 76개소를 선정한 후 응력해석 전용프로그램인 CAESAR-Ⅱ를 이용하여 응력특성을 연구하고, 교량배관 중 루프관을 설치할 경우 루프관의 위치 및 크기가 배관의 합성응력에 미치는 영향을 분석하였다. 본 연구의 결과를 통해 교량 배관의 설치, 검사 및 진단 기준 개선 등에 활용하여 교량설치 배관에 대한 안전성 향상에 도움이 될 수 있을 것으로 판단한다. In this study, 398 city gas pipe systems installed on the bridges were surveyed and analyzed classified characteristics about the ages, length, and remote isolation devices installed or not. As a result of analysis, 43.0% pipes have been used more than 20 years and 89.4% do not have remote cut-off devices, so this study suggest safety management ways for the issues. Chosen 76 pipes were researched stress strain characteristics by CAESAR-Ⅱ which is a specialized program for stress analysis. And, when a loop is installed on the bridge pipe, effect on code stress by the location and size of the loop was performed. This study can help to improve safety level by revising criteria of new installation, inspection and diagnostic.

      • KCI등재

        역해석을 이용한 가시설공사 현장관리 시스템 개발

        윤영만 한국재난정보학회 2019 한국재난정보학회 논문집 Vol.15 No.4

        연구목적: 본 연구에서는 안전한 가시설 공사를 위해서 현장에서 수행하고 있는 계측관리 결과를 현장 관리자와 구조검토자가 공유하여 실시간 의사결정을 이용한 빠른 현장대처가 가능한 시스템을 개발하 고자 한다. 연구방법: 계측시스템과 가시설 구조검토시 반영하는 역해석 기법을 동시에 이용하여 계측 결과로부터 시공상태의 안전성을 파악하고 공사중 발생할 수 있는 위험요인을 판단하여 시공중 선제 적 대응할 수 있는 가시설 공사중 지반물성치 및 기후변화의 이변성에 대응하는 시스템을 도입하였다. 연구결과: 현장여건과 설계 물성치의 불일치 및 예상치 못한 하중 및 외기환경으로 설계에서 예측한 설 계결과와 계측결과의 차이 발생에 대처할 수 있는 SUNEX 프로그램의 역해석 알고리즘을 개발하고 계 측결과와 해석결과가 일치하는 과정을 확인하는 안전관리시스템을 개발하였다. 결론: 실시간 계측결 과 값을 수집하여 외부서버 및 안전관리 시스템 프로그램과 통신할 수 있는 게이트웨이를 제작하여 개 발한 안전관리 시스템에서 실시간으로 해석결과 값과 비교가 가능하도록 하여 현장에서 발생할 수 있 는 위험요인에 대한 선제적 대응이 가능하도록 하였다. Purpose: The purpose of this study is to develop a system that enables quick on-site response using real-time decision-making by sharing the results of measurement and management performed in the field for safe temporary construction. Method: It is possible to take preemptive responses during construction by identifying the safety factors of construction conditions from measurement results and determining the risk factors such as soil properties and variability of climate change that can occur during construction by simultaneously using the back analysis method reflected in the measurement system and structural review. Result: we developed a back analysis algorithm of the SUNEX program to cope with the discrepancies between the design results and measured results due to inconsistency between site conditions and design properties, unexpected loads, and outdoor environment. The process of matching the measurement result with the analysis result can be confirmed in the safety management system. Conclusion: Gateway was used to communicate with real-time measurement results and safety management system program. It was made possible to preemptively respond to risk factors that may occur in the field.

      • KCI등재

        저선량 ${\gamma}$ 선 조사가 배추와 무 종자의 발아와 양분흡수에 미치는 영향

        윤영만,김남범,김재성,김정규,Yoon, Young-Man,Kim, Nam-Bum,Kim, Jae-Sung,Kim, Jeong-Gyu 한국환경농학회 1999 한국환경농학회지 Vol.18 No.4

        배추와 무의 영양생리에 대한 저선량${\gamma}$선에 의한 자극작용의 영향을 파악하고자 1998년산 흑진주배추, 1995년산 서림엇갈이배추, 1998년산 청운무 종자에 1에서 10Gy의 저선량 ${\gamma}$선을 조사하고 생육시기에 따른 생장량과 무기양분의 변화를 분석하였다. 공시된 배추품종들은 조사선량의 증가에 따라서 발아율과 건물생산량이 증가하는 경향을 보였다. 건물생산의 증가는 흑진주배추에서 가장 현저하여 10Gy 처리구에서 143%로 증가되었고, 서림엇갈이배추는 10Gy에서 138%로 증가하였다. 청운무는 ${\gamma}$선 조사에 따른 발아율과 건물생산량의 일관된 경향성을 보이지 않았다. 무기영양소들의 함량변화는 선량-반응 곡선의 ${\gamma}$ 또는 ${\delta}$형을 나타내 ${\gamma}$선에 의한 자극효과가 일부처리구에서 나타나기는 하였지만 일반적 현상이라고 인정하기 어려웠다. 따라서 저선량 ${\gamma}$조사가 배추와 무의 영양생리에 미치는 영향을 정확하게 파악하기 위한 연구결과의 집적이 필요할 것으로 판단된다. To investigate hormetic effect of low dose ${\gamma}$-ray on the uptake of mineral nutrients in Chinese cabbage (Brassica campestris var. Hekjinju var. Surim and) and radish (Raphanus sativas var. Chung-un), seeds of these plants were irradiated with the dose of 1 to 10 Gy. Germination rate and dry weight were examined at pot experiment in greenhouse. Samples for analysis of mineral nutrient were harvested at 17 days and at 59 days after seedling and were analyzed by ICP. Brassica campestris varieties showed higher germination rate and dry weight production with increasing ${\gamma}$ ray dose. Dry weight of Hekjinju Surim and were 143% and 138% at 10Gy dose. respectively. There was no tendency in germination rate and dry weight production for Raphanus sativas var. Chung-un with ${\gamma}$-ray irradiation. The pattern of mineral nutrient content of these plants showed ${\gamma}$ or ${\delta}$ type of dose-reaction curve with no siginificant. This investigation suggests that the more results can be required to understand the hormetic effect of low dose ${\gamma}$ ray on the uptake of mineral nutrient for these plants.

      • 구강병으로 인한 학업손실실태와 그 연관요인에 관한 연구

        윤영만,이흥수 원광대학교 치의학연구소 2002 圓光齒醫學 Vol.11 No.2

        To prepare basic data for oral health promotion of elementary and middle school students through the survey of the status of school loss on account of oral diseases and the examination of the related factors, a questionnaire survey was conducted for 3,080 students. School loss was investigated based on the experiences of absences and leaving school early, which had happened from oral diseases. Also the restricted activities related with schoolwork such as dining and sleeping were surveyed. The independent variables were oral health behaviors and socioeconmic factors such as sex, age of their parents, education level of their fathers, family income. Factors related with school loss and the restricted activities were analyzed by the multiple logistic regression method. The results of this study were as follows. 1. The 2.37% of students were absent on account of oral disease at elementary and midlde school. Also, the annual average days of absence and early leaving school for elementary school students were 0.05, while the average days for middle school students were 0.07. 2. The rate of students' restricted activity were 39.1% at elementary school and 55.7% at middle school. 3. The elementary students whose mothers are employed showed higher probability of absence due to oral diseases than the students whose mothers are unemployed. 4. The elementary students who live in rural regions showed higher probability of absence and restricted activities on account of oral diseases than the students who live in urban regions. 5. School loss of middle school students was correlated to a load of schoolwork and score of schoolwork. 6. Middle school students who do not trust oral treatment showed higher probability to experience the restricted activities due to oral diseases than the students who trust in it.

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