교량에 설치된 도시가스배관의 안전관리에 관한 연구

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

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. 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.

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

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.

공동주택 등에 설치하는 도시가스 압력조정기의 안전성 향상에 관한 연구

윤영만,권용재,김경호,장지현 한국가스학회 2023 한국가스학회지 Vol.27 No.2

본 연구는 공동주택에 도시가스를 공급하기 위해 정압기 대신 설치하는 공용 압력조정기의 안전성 향상을위한 대안을 마련하기 위한 목적으로 진행되었다. 먼저, 국내 압력조정기의 안전기준 및 설치 실태를 조사하여 문제점을 도출하고 해결방안을 제시하였다. 또한 정량적 위험성평가 솔루션인 DNV Phast-Safeti 프로그램을 이용해 공동주택에 설치되는 압력조정기와 주변 가스설비에 내포된 가스누출 등의 위험성을 개인적 위험도와 사회적 위험도로 구분하여 평가하고, 압력조정기의 설치와 관리 측면에서 위험성 감소를 위한 방안을도출하였다.

바다가 보이는 응접실 : 벌과금은 싫다 - 초대손님 윤영 [ 전 ( 前 ) 인천항 도선사 ]

윤영 한국해사문제연구소 1996 해양한국 Vol.270 No.-

N/A

국내 바이오매스 이용 실태와 활성화 방안

윤영만 한국농촌경제연구원 2014 세계농업 Vol.162 No.-

망각〔遺忘〕이라는 ‘파르마콘’에 관하여

윤영도(尹泳?) 새얼문화재단 2012 황해문화 Vol.76 No.-

포스터발표논문초록 / 토양 비료 분야 ( SF : Siol & Fertilizers ) : SF06 - 토양수분함량과 자란의 초기 생육

윤영만,장미영,박천호,김정규 한국토양비료학회 1998 한국토양비료학회 학술발표회 초록집 Vol.- No.-

필러 배합에 따른 치면열구전색제의 법랑질 결합 및 강도특성

윤영만,이흥수 원광대학교 치의학연구소 1999 圓光齒醫學 Vol.9 No.1

One of the characteristics that can predict the cariostatic effect of dental pit and fissure sealants is wear resistance of the material, and those for the expectation of the retention rate is the bond strength to enamel. Although the Bis-GMA resin based sealants are widely used, their mechanical properties are lower than those of composite filling resins because of lower cross-linking of the material. After incorporation of filler to the resin sealant, almost all the mechanical properties are improved except tensile strength. Incorporation of filler also results in higher abrasion resistance, and easy discrimination of the sealant. However there are a few reports on the mechanical properties and bond strength of sealant after incorporation of various amount of filler to the same resin for sealant. The purpose of this study was to determine the bond characteristics to enamel and the biaxial fracture strength of dental pit and fissure sealants after incorporation of various amount of glass fillers to the same unfilled resin sealant. Light cured pit and fissure s&alants(CO and TM) were used as controls. Glass filler was incorporated in the chemically cures resin sealant(HP) with the ratio of 10, 30 and 50 wt.%, and was used as experimental groups. Two types of fillers, silane-coated and not coated, were used. For bonding test, flat enamel surface was made on sound premolar tooth by grinding with #600 silicone carbide paper. This surface was etched with 37% phosphoric acid for 30 second, and sealant filled gelatin capsule(3 mm diameter) was attached to this surface. After immersion in 37℃ distilled water for 24 hours, shear bond properties were measured with a universal testing machine(Zwick 020, Germany) with the cross-head speed of 1㎜/min. From the load-deflection curve obtained, shear bond strength, displacement at bond failure and elastic modulus ratio was calculated. For biaxial fracture strength test, diameter of 10㎜ and thickness of 2㎜ specimens were made with the same materials as in bonding test. After immersion in 37℃ distilled water for 24 hours, biaxial fracture properties were measured with a universal testing machine(Zwick 020, Germany) with the cross-head speed of 0.5㎜/min. From this experiment, the following results were obtained. 1. The shear bond strength of unfilled HP to enamel surface was 13.870㎫, and those after filler incorporation were 18.956-19.684㎫. 2. The shear bond strength to enamel surface increased significantly after incorporation of filler with the ratio of 10, 30 and 50 wt.%(p<0.05), and the incorporation ratio did not influence on the shear bond strength(p>0.05). Silane treatment of the filler did not influenced on the shear bond strength(p>0.05). 3. The biaxial fracture strength of TM was 170.69㎫, and this was significantly higher than that of unfilled HP(p<0.05). Incorporation of the filler with the ratio of 10, 30 and 50 wt.% resulted in significantly lower biaxial fracture strength compared with that of unfilled HP(p<0.05). 4. In HP with the incorporation of filler 10 or 30% group, the biaxial fracture strength of silane coated and not-coated filler group was significantly different(p<0.05).

일본 바이오매스 활용 정책 및 기술현황

윤영만,유호천,김창현,최은희,윤성이,Yoon, Young-Man,Yoo, Ho-Chun,Kim, Chang-Hyun,Choi, Eun-Hee,Yoon, Sung-Yee 한국유기농업학회 2012 한국유기농업학회지 Vol.20 No.4

Based on the general policy called "Green Growth", the Korean government planed to establish a biomass town in South Korea in order to recover energy from organic waste and to substitute for fossil fuel at rural region. Technical and financial support for the establishment of biomass town was insufficient so far. There are some policies to support biomass town establishment, however financial support from several Korean ministries seemed not to have been used efficiently. Some policies are planned excessively so that they cannot be realized on time. Therefore, there is a need to analyze the status of biomass utilization technology and policy in Japan from the point of view of an external biomass expert, since biomass utilization technology and policy of Japan take good achievement during the many developed countries. For the analyzing of technology and policy in Japan, literatures concerned biomass management policy and biomass town design were collected by visiting Japan Ministry of Agriculture, Forestry and Fisheries and interview of public officials in charge was carried out. There are several implications for the promotion of Korean policy concerned with biomass utilization and biomass town establishment.

친환경 농업기술로서의 규소의 잠재적 효용성

윤영만,장준영,김정규 고려대학교 자연자원연구소 2000 自然資源科學硏究 Vol.8 No.-