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.

망각〔遺忘〕이라는 ‘파르마콘’에 관하여

윤영도(尹泳?) 새얼문화재단 2012 황해문화 Vol.76 No.-

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.

국내 바이오매스 이용 실태와 활성화 방안

윤영만 한국농촌경제연구원 2014 세계농업 Vol.162 No.-

유리섬유복합소재를 이용한 지중매설형 승하강식 홍수방지 벽체구조물

윤영만 한국재난정보학회 2013 한국재난정보학회 논문집 Vol.9 No.4

제방 월류방지 대체공법으로 전도식, 부력식 홍수방지벽을 국내ㆍ외에서 개발하는 실정이다. 그러나, 사전점검 불가 및 유지관리 문제점이 있어 본 연구에서는 국내ㆍ외 최초로 경량 재질이면서 강도가 우수한 유리섬유복합소재를 이용한 승하강식 홍수방지 벽체구조물을 연구ㆍ개발하였다. 개발된 홍수방지 벽체구조물은 수치해석을 통해 구조적 안정성과 함께 현장 적용성을 제시하여 공사비를 약 87%~95%로 감소시키고 벽체구조물 내부에 고무지수부재를 설치하여 차수성이 확보되는 것을 확인하였다.

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.

ICT 융합 지자체 교량 유지관리 시스템개발

윤영만 한국재난정보학회 2017 한국재난정보학회 논문집 Vol.13 No.4

For the bridges managed by the municipalities, there is a need for a maintenance management system for the municipal governments for the scientific and systematic maintenance standard and the scientificization of the budget acquisition and execution through the quantified data base. The purpose of this study is to develop a system for efficient management of small bridgies maintained by the municipality and use ICT convergence technology such as BIM / GIS technology. The details of the system development include the development of the small bridgies maintenance program for mobile devices, the development of the small bridgies maintenance database, the development of the small bridgies integration maintenance management, and the reliability of the program system developed by checking the construction and operation contents of the small bridgies test-bed. The developed program system is linked to the development of smart name plate and reader module of non - power system. 지자체에서 관리하는 교량에 대해서 과학적이고 체계적인 유지관리 표준안과 정량화된 데이터기반을 통한 예산확보 및 집행의 과학화를 위해 지자체관리용 교량 유지관리시스템이 필요한 실정이다. 본 연구는 지자체에서 유지관리하고 있는 소규모 교량의 효율적인 관리를 위한 시스템 개발을 목표로 하며 BIM/GIS기술 등의 ICT융합기술을 사용하였다. 시스템개발의 세부내용으로는 모바일 기기용 소규모 교량 유지관리 프로그램 개발, 소규모 교량 유지관리 데이터베이스 개발, 소규모 교량 통합유지관리 개발이며 지자체에서 관리하는 소규모 교량의 테스트베드 구축 및 운영내용을 확인하여 개발한 프로그램 시스템의 신뢰성을 얻었다. 개발된 프로그램 시스템을 무전원방식의 교량 스마트 명판제작 및 Reader모듈 개발로 연계하였다.

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.

The Performance of Anaerobic Co-digester of Swine Slurry and Food Waste

윤영만,김현철,유정숙,김승환,홍승길,김창현 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.1

In order to assess the performance of co-digester using pig slurry and food waste at the farm scale biogas production facility, the anaerobic facility that adopts the one-stage CSTR of 5 m^3 day^-1 input scale was designed and installed under the conditions of the OLR of 2.33 kg m^-3 day^-1 and HRT of 30 days in an pig farmhouse. Several operation parameters were monitored for assessment of the process performance. The anaerobic facility was operated in three stages to compare the performance of the anaerobic co-digester. In the Stage I, that was fed with a mix of pig slurry to food waste ratio of 7:3 in the input volume, where input TS content was 4.7 (± 0.8) %, and OLR was 0.837-1.668 kg-VS m-3 day-1. An average biogas yield observed was 252 Nm^3 day^-1 with methane content 67.9%. This facility was capable of producing an electricity of 626kWh day^-1 and a heat recovery of 689 Mcal day^-1. In Stage II, that was fed with a mixture of pig slurry and food waste at the ratio of 6:4 in the input volume, where input TS content was 6.9 (± 1.9) %, and OLR was 1.220-3.524 kg-VS m^-3 day^-1. The TS content of digestate was increased to 3.0 (± 0.3) %. In Stage III, that was fed with only pig slurry, input TS content was 3.6 (± 2.0) %, and OLR was 0.182-2.187 kg-VS m^-3 day^-1. In stage III, TS and volatile solid contents in the input pig slurry were highly variable, and input VFAs and alkalinity values that affect the performance of anaerobic digester were also more variable and sensitive to the variation of input organic loading during the digester operation. The biogas produced in the stage III, ranged from 11.3 to 170.0 m^3 day^-1, which was lower than 222.5-330.2 m^3 day^-1 produced in the stage II.