다목적 쌍발 헬리콥터용 터보축 엔진의 성능해석 및 기본설계

윤건식,서정원 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.1

공기과잉율의 변화가 에탄올 혼합연료 기관의 배기 특성에 미치는 영향

윤건식,박대곤 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-

Ethanol is an attractive alternative fuel for automotive engine to overcome the limit of petroleum resources and pollution problems. Ethanol contains oxygen in itself and has ability to improve thermal efficiency owing to higher octane number than gasoline. Also it can be used as clean fuel for low emissions. The effect of gasoline-ethanol blends on the performance characteristics including exhaust emission of the MPI gasoline engine were examined. The experiments were carried out over the various air-fuel ratio. The blending rates of ethanol were selected as 10 to 30 percent according to the analysis of the properties of blended fuels. The emission characteristics of ethanol-blended fuels showed the similar trend with those of gasoline fuel, in general. Any observable quantitative differences in concentration of nitric oxides and carbon monoxide were not seen when the blended fuels were used, while the concentration of hydrocarbon is slightly reduced by the use of ethanol blended fuels compared with gasoline fuels.

중부지역의 콩 주요 품종별 생육특성 및 아이소플라본 함량 비교

윤건식,황세구,홍성택,홍의연,윤홍태,김홍식 한국국제농업개발학회 2016 韓國國際農業開發學會誌 Vol.28 No.4

This study was performed to select the high-yield soybean cultivar suitable for the mid part of Korea and to provide as a basic data for improving productivity of the farmhouse. To this, Daewon as a control and four soybean cultivars such as Uram, Taeseon, Saegeum and Seonpung soybean seeds known that high-yield varieties developed after 2010 were selected. Growth characteristics and functional isoflavone contents of five soybeans were field tested at the field in Goesan, Chungbuk during 2014 and 2015. In comparison with Daewon, maturity date was recorded the earliest at Taesun with 15th Oct. Height of the first pod for the mechanical harvesting have a benefit to Uram (16.8 cm) and Taeseon (14.6 cm), however; shattering percentage of Taeseon were showed the high value of 11.2%. Productivity of Uram, Seonpung and Taesun were increased with 20, 9, and 5 %, respectively, compare to that of Daewon. Total isoflavones contents (μg/g) of five soybeans were ordered as Saegeum (1222.2) > Uram (1111.9) > Seonpung (897.2) > Daewon (885.8) > Taesun (829.5). Total isoflavones contents when soil mulching compare to the non-mulching were increased 206.6 μg/g at Daewon and 460.8 μg/g at Uram soybean.

내연기관 흡기 계통의 Plenum Chamber의 유동 해석 모델에 관한 연구

윤건식,윤영환,우석근 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

In this paper, the simulation models were examined to represent the flow through the plenum chamber in the intake system of MPI spark ignition engine. The constant-pressure perfect-mixing model or branch model which had been devised originally to represent the flow through the manifold branch system was tested. The constant-volume model or tank model also applied and the results were compared with those of the branch model. The prediction accuracies showed no remarkable differences between two models. Therefore, both models would be applicable successfully to represent the flows at the plenum chamber.

다중 연료 분사식 SI 기관의 흡ㆍ배기 계통의 해석

윤건식,신흥한,우석근 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-

In this study, the calculation of the behavior of gas in the intake and exhaust system of the multi-point injection SI engine has been accomplished under various operating conditions. The generalized method of characteristics including friction, heat transfer, area change and entropy gradients was used to analyze the pipe flow. The simulation models were selected not to depend much on the empirical constants. The constant-pressure model and the constant-volume model were compared to analyze the gas behavior in the plenum chamber in intake system. Through the comparison of predicted results with experiments, the simulation program was verified by showing good prediction of the behavior of IC engine qualitatively and quantitatively over the wide range of operating conditions.

내연기관 배기 계통의 유동 해석 모델에 관한 연구

윤건식,윤영환,서문진 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-

This paper presents the examination of the various simulation models to represent the flow through the exhaust system in the internal combustion engines. Three models - adiabatic pressure loss model, sudden enlargement and sudden contraction model and the constant volume model - have been examined theoretically and experimentally to represent the flow through the catalytic converter and the muffler. This study shows that the combination of the sudden enlargement-sudden contraction model for the catalytic converter and the constant volume model for the muffler gives the best results.

개체명 인식을 위한 MixUp 기반 교차 일관성 학습

윤건식,고다희,이종태 대한산업공학회 2022 대한산업공학회 춘계학술대회논문집 Vol.2022 No.6

에탄올 / 가솔린 혼합연료가 분사식 스파크 점화기관의 성능에 미치는 영향

윤건식,양창석 산업기술연구소 1999 産技硏論文集 Vol.13 No.-

충북지역 토마토 시설재배지의 풋마름병균(Ralstonia solanacearum) 오염도 및 분리균주의 특성

윤건식,차재순,박상용,강효중,이기열 한국식물병리학회 2004 식물병연구 Vol.10 No.1

Contamination level and characteristics of Ralstonia solanacearum in soil of greenhouses cultivating tomato plants in Chungbuk province was determined. R. solanacearum was isolated with the semiselective media in 27 greenhouse soil samples out of 133 greenhouses soil investigated, which indicates 20.3% of tomato cultivating greenhouses in Chungbuk contaminated with the bacterial wilt pathogen. Density of R. solanacearum was estimated to 102~4 cfu/g in the contaminated soil. All 71 isolates of R. solanacearum which containing 12 isolates from the diseased tomato plants were race 1, and 35 isolates of them were biovar 3 and 36 isolates were biovar 4. More than 88% of 71 isolates were inhibited growth on nutrient agar containing oxolinic acid 0.5 mg/ ml, streptomycin 25 mg/ml, tetracycline 5 mg/ml and cupric sulfate 375 mg/ml (1.5 mM). The 11.3%, 4.2% and 5.6% of the isolates can grow on nutrient agar containing 10 times more oxolinic acid, streptomycin, tetracycline than minimal inhibitory concentration of the sensitive strains. Five isolates were resistant to 2 bactericides and one isolates was resistant to all 3 bactericides.

콩 주요 세균병의 충북지역 발생현황

윤건식,문혜림,김태일,김익제,김영호,김홍식,차재순 한국작물학회 2021 한국작물학회지 Vol.66 No.4

In recent years, the occurrence of bacterial diseases of soybean has been increasing due to the continuous rise in spring temperature and the humid weather as a result of rain concentrated at the middle and late stages of crop growth. The resulting severe economic damage is also a concern. Unfortunately, there are no precise data on the occurrence and damage to lay the foundation for bacterial disease control in soybean in the Chungbuk Province. Therefore, the present study investigated the occurrence of major bacterial diseases, namely bacterial pustules, bacterial blight, and wildfire, in different soybean varieties in 410 fields in the Chungbuk Province in 2017. The incidence rate of bacterial pustules in the affected fields was 76.6%, and the incidence rate of infected plants was 29.3%. The incidence rate of bacterial blight in the affected fields was 13.9%, and the incidence rate of infected plants was 4.6%. The incidence rate of wildfire in the affected fields was 23.2%, and the incidence rate of infected plants was 10.1%. The overall incidence rate of bacterial diseases in the soybean fields where the diseases originated was 37.9% for bacterial pustules, 21.0% for bacterial blight, and 25.0% for wildfire, indicating that the disease incidence rate in fields where the disease originated was generally high. Among different varieties, the incidence rate of bacterial pustules was the highest in sprout soybean (88.9%), followed by Seoritae (84.0%) and Daewon (81.2%). The incidence rate of bacterial blight was the highest in the Daewon (19.6%), followed by Seoritae (15.2%) and sprout soybean (12.5%). The incidence rate of wildfire was the highest in sprout soybean (25.0%), followed by Daewon (24.7%) and Seoritae (5.4%). Meanwhile, in Uram, the incidence rate of bacterial pustules (7.1%) was the lowest, and this variety was not affected by bacterial blight or wildfire. 최근 봄 기온의 지속적인 상승과 콩 생육 중・후반기 집중된 비로 인한 다습한 날씨로 콩 세균병이 증가함에 따라, 경제적인 피해도 우려되고 있는 상황이다. 이에 따라 지금까지조사되지 않았던 충청북도 내 콩 주요세균병인 불마름병, 세균점무늬병, 들불병의 지역별 발생양상을 파악하여 세균병의 방제접근에 활용하고자 조사한 연구결과는 다음과 같다. 1. 불마름병 발병 포장률은 76.6%로, 보은 93.3%, 제천83.9%, 옥천 83.3%, 괴산 81.7%, 청주 80.0% 순으로 높은 경향이었으며, 포장 내 발병주율은 29.3%를 나타냈다. 병 발생이 시작되는 7월과 8월 평균기온이 평년에비해 높고, 그 시기에 집중된 강우는 초기 병의 발생과확산에 영향을 주었을 것으로 판단된다. 2. 들불병 발병 포장율은 23.2%로, 단양 60.5%, 옥천 30.2%, 제천 26.8%, 괴산 26.7%로 순으로 발병 포장율이 높은경향이었으며, 포장 내 발병주율은 10.1%를 나타냈다. 단양, 괴산, 음성, 제천지역이 도내 북부권이면서, 상대적으로 지대가 높고, 초가을 9월 평균기온이 다른 지역에 비하여 낮은 것이 들불병 발생에 영향을 미친 것으로판단된다. 3. 세균점무늬병 발병 포장율은 13.9%로, 괴산과 옥천지역이 30.0%, 보은 20.0%, 청주 15.0% 순으로 발병 포장율이 높은 경향이었으며, 포장 내 발병주율은 4.6%를 나타냈다. 세균점무늬병은 불마름병이나 들불병에 비해 상대적으로 낮은 온도인 24~26°C의 시원하고 다습한 환경에서 발생되는 것으로 볼 때 7월의 잦은 비로 인한 시원한 날씨가 다발생에 영향을 준 것으로 판단된다. 4. 세균병이 발생한 포장에서 실제 병 발생의 심각성 알아보고자 발병주율을 조사한 결과, 불마름병은 37.9%, 세균점무늬병은 21.0%, 들불병은 25.0%순으로 높은 경향이었으며, 전체 필지를 대상으로 조사한 결과보다 각각8.6%p, 16.4%p, 14.9%p 높았다. 5. 콩 품종에 따른 불마름병 발병 포장률은 콩나물콩 88.9%, 서리태 84.0%, 대원콩 81.2% 순으로 높은 경향이었고, 세균점무늬병은 대원콩 19.6%, 서리태 15.2%, 콩나물콩12.5%, 들불병은 콩나물콩 25%, 대원콩 24.7%, 서리태5.4% 순으로 발생이 많은 경향이었다. 하지만, 우람콩은불마름병 7.1%, 세균점무늬병과 들불병은 발병되지 않아 콩 세균병에 저항성을 나타내었다.