4 행정 사이클 스파크 점화기관의 시뮬레이션에 관한 연구 (제1보)

윤건식,우석근,서문진,신승한 한국마린엔지니어링학회 2001 한국마린엔지니어링학회지 Vol.25 No.6

The simulation program which predicts the gas behavior in a spark ignition engine has been developed and verified by the comparison with the experimental results foy the MPI engine, naturally aspirated and turbochared engines with a carburettor. First paper describes the calculations of the behavior of gas in the intake and exhaust system. The generalized method of characteristics including friction, heat transfer, area change and entropy gradients was used to analyse the pipe flow The constant-Pressure model was applied for the analysis of the flow through engine valved, and the constant-pressure perfect-mixing model was applied for the flow at manifold junction. The concept of the sudden area change was used for the muffler and catalytic convertor. Fer the plenum chamber in an MPI engine, constant-pressure model and constant-volume model were both examined. 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 under wide range of operating conditions.

다수성 중생 찰기장 ‘청풍찰’

윤건식,이재웅,황세구,김익제,홍성택,고지연,최규환,김용순,김홍식 한국육종학회 2019 한국육종학회지 Vol.51 No.1

To satisfy the health needs of consumers and enhance the yields of producers, a grain crop ‘Cheongpungchal’ (Panicum miliaceum L.) with many common names, including proso millet, was collected from a landrace in Danyang, Chungbuk province and developed using a pure-line selection method. ‘Cheongpungchal’, which has a brown seed coat, has characteristics of a medium-maturing variety, requiring 102 days from sowing to harvesting. The variable growth characteristics included a stem length of 155 cm on average and length of ears 38.4 cm on average. As for the yield-related characteristics, the average number of spikes per plant was 3.8, the ear weight per plant was 11.8 g, and the rough millet thousand-grain weight averaged 5.17 g. The results of a regional adaptation test in 5 regions of Korea for three years revealed the yield of ‘Cheongpungcha’l to be 38% higher than that of the ‘Hwanggeumgijang’ variety, representing the best yield from among existing varieties. The total polyphenolic content of ‘Cheongpungchal’ was 32% higher than that of the ‘Hwanggeumgijang’ variety, and the antioxidant activity was 63% greater than that of ‘Hwanggeumgijang’. As a result of this research, ‘Cheongpungchal’ has been registered as a variety (grant number No. 6964) with the Korea Seed and Varieties Service in 2018 following filing for breed protection in 2016.

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.

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.

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.

무측지 넓은 타원형계 수박 ‘순제로’

윤건식,노솔지,전유민,윤철구,박성원,김은정,김주형,김태일 한국육종학회 2023 한국육종학회지 Vol.55 No.4

As the rural farming population decreases and ages, there is a gradual decrease in watermelon cultivation. Although the productionof small- and medium-sized watermelons is increasing, typical large-sized watermelons are still, which culminates in their cultivation beinga burdensome task for elderly farmers. To address this issue, we developed a watermelon variety, namely, ‘Soonzero,’ that does not requirepruning, as its secondary lateral branches do not occur in primary lateral branches after the growing point it cut. ‘Soonzero’ is a diploidand broad, elliptical watermelon; its uniqueness lies in its green skin and pinkish-red flesh. The conspicuousness of veining on the skin isweak, and the width of the fruit's stripes is similar to that of ‘Sambokggul.’ In terms of variable characteristics, in this study, this varietyproduced 452 seeds, a yield similar to that of ‘Sambokggul,’ with the length and width of the resultant fruit being 25.5 and 24.2 cm, respectively. Additionally, the pericarp of ‘Soonzero’ had a thickness of 1.0 cm and a total soluble solid content of 11.8 °Bx. The yield of ‘Soonzero’was found to be 6,150 kg per 10 acres, similar to that of ‘Sambokggul.’ However, ‘Soonzero’ differs from the control in terms of the followingtraits: fruit stripe width, flower spot shape, and the conspicuousness of veining on the fruit. In conclusion, the secondary lateral branchlessvarieties developed at the Watermelon Research Institute are expected to be quickly distributed to farmers with excellent quality by makingup for their shortcomings by transferring technology to breeding companies and giving consumers the opportunity to choose according totheir purchasing preferences. Above all, since it can reduce the labor required to remove lateral branches, it will help farmers grow watermelonsmore easily by solving aging and labor issues, which are chronic problems in rural areas (Grant number 8807).

무측지 타원형계 이배체 수박 ‘순리스’

윤건식,노솔지,전유민,윤철구,김은정,김인재,김태일 한국육종학회 2023 한국육종학회지 Vol.55 No.3

Removing secondary branch to produce commodity watermelons is labor-costing and time-consuming work in traditional watermeloncultivation. Moreover, because elderly farmers work for a long time with their backs bent, musculoskeletal disorders reduce the quality oflife of farmers. To improve this working condition, we developed the watermelon 'Soonless' variety that does not need to be pruned becausethere is no secondary branch. For diploid oval watermelons, the stripe width of the fruit is wide, the color of it's skin is green, and theflesh is pinkish-red. It contains 480 seeds of ‘Soonless’, and the fruit weight is 8.6 kg, which is heavier compared to ‘Sambokggul’. Thethickness of the pericarp is 1.3 cm, and the total soluble solids content is 12.0 °Bx, which is similar to ‘Sambokggul’. The characteristicswhich distinguish it from the control variety include the leaf blade length and width, the ovary size, the width of the fruit stripes, and thethickness of the pericarp. The yield was 6 ,450 kg/10a, an increase of 5.3% compared to ‘Sambokggul’. As a result of this research, ‘Soonless’has been registered as a variety with the Korea Seed and Varieties Service in 2022 as it was filed for breed protection in 2019 (RegistrationNo. 8808).

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

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.