http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
소현규,조태현,이용한,구본찬,이도형 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.2
The HRSG extensively affects all performance of CCPPs. The inlet duct geometry of an HRSG is the most essential part for determining heat exchange in the main body, in terms of flow uniformity. In the present study, numerical analysis of the HRSG flow characteristics and design optimization of inlet duct geometry for improving flow uniformity at the front section of the main body were performed to meet the trend requirements. A new inlet duct geometry, which has maximum flow uniformity, was proposed through design optimization procedures using a genetic algorithm. Specifically, the actual operating condition of the D-top model HRSG was applied and the pressure recovery coefficient and diffuser efficiency were considered. In the optimized design, a recirculation area was formed at the top internal wall of the second expansion stage. Results indicate that the forming of the recirculation area improves flow uniformity by rotating movement and spreading the high-speed flow.
소현규,김용기,홍성준,한은정,박종호,심창기,김민정,김석철 한국유기농업학회 2017 韓國有機農業學會誌 Vol.25 No.2
본 연구는 황토유황을 활용하여 벼 키다리병 발병을 최소화할 수 있는 최적 종자소독조 건을 선발하기 위해 수행되었다. 키다리병에 이병된 ‘신동진’ 품종 벼 종자를 공시하였고 황토유황 농도, 침지온도, 시간, 온탕여부를 구분하여 실내 및 온실검정을 통해 침지시간은 48시간, 침지농도는 1%로 최적 소독조건을 선발하였다. 그리고 모판과 포장시험을 수행하 여 온탕처리 후 20℃, 1% 황토유황에 48시간 침지 처리구와 30℃, 1% 황토유황에 48시간 단독 침지할 때 가장 효과가 높았다는 것을 확인하였고 위 처리조건으로 소독한 종자가 육 묘, 이앙, 출수기를 거치면서도 100%의 높은 방제효과가 유지되는 것을 확인할 수 있었다. 그러나 20℃에서 1% 황토유황으로 침지한 처리구에서는 포장에서 78.2%의 낮은 방제가를 보였다. 또한, 온탕소독만 수행한 처리구에서도 60℃, 10분간 충실히 수행될 경우 효과적인 벼 키다리병 방제가 가능함을 보여주었지만 온탕처리 후 황토유황으로 추가 침지함으로서 많은 양의 종자를 소독할 때 좀 더 나은 키다리병 방제 효과를 가져다 줄 수 있을 것으로 판단된다. 이상의 결과를 종합하여 볼 때 농가에서 온탕소독기와 종자소독기 둘 중 한가지 만 구비하더라도 황토유황을 이용하여 충분한 소독효과를 낼 수 있기 때문에 현장에서 보 다 쉽게 활용될 수 있을 것으로 판단되며 제조방법이 쉽고 비용이 적게 드는 황토유황의 특성상 농가의 경영비 절감효과도 클 것으로 기대된다. This study was conducted to evaluate rice seed disinfection efficacy of loess-sulfur for the suppression of Bakanae disease caused by Fusarium fujikuroi. Rice seeds were treated at different concentrations of loess-sulfur, soaking time and temperature, and combination of hot-water treatment. Rice cultivar, Shindongjin harvested from Bakanae disease-infested area in 2015, was used. Loess-sulfur was treated as follows; concentration of undiluted solution, 2%, 1% and 0.5%; soaking time of 24 and 48 hours; treatment temperature of 20℃ and 30℃; hot water treatment or not. Optimal conditions of rice seed disinfection were selected soaking time of 48 hours and the suspension of 0.5% and 1% loess-sulfur by investigating seed germination and isolation frequency of Fusarium spp. on Komada agar medium in vitro, and were established 3 disinfection conditions as hot water (60℃, 10 min.) + 1% loess-sulfur (20℃, 48 hours), 1% loess-sulfur only (30℃, 48 hours) and 1% loess-sulfur only (20℃, 48 hours) through additional test in greenhouse. Above 3 conditions were verified by rice seedling box and paddy field test in the way of investigating Bakanae diseased plants (%) and healthy plants (%). Consequently, most effective rice seed disinfection conditions on Bakanae disease were combination of hot water and 1% loess-sulfur and loess-sulfur only at 30℃. Furthermore, treatments with these conditions showed control value of 100% were maintained from seedling to the heading stage in the field. However, treatment of 1% loess-sulfur only at 20℃ showed low control value of 78.2% in paddy field. Hot water only treatment turned out to be an effective disinfection method when conducted thoroughly with 60℃, 10 min. However, it was thought additional soaking process with loess-sulfur after hot water treatment served more high control effect against Bakanae disease when rice seeds were disinfected on a large scale. This results expected rice seed disinfection with loess-sulfur were effectively and easily usable method if farmers had only one of either hot water-disinfector or seed-disinfector. In addition, loess-sulfur is well-known to farmers, simple to manufacture method and cheap.
추력과 효율 향상을 위한 AUV Double Hydrofoil의 모션 최적설계
소현규(H.K. So),조태현(T.H. Jo),이용한(Y.H. Lee),김진산(J.S. Kim),한준희(J.H. Han),구본찬(B.C. Koo),이도형(D.H. Lee) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.1
While most AUV researches have concerned about single hydrofoil, practical AUV’s are generally operated with multiple hydrofoils. Double hydrofoil study attempts to evaluate thrust and efficiency with various flapping motions, and carries out design optimization using parametric analysis. Flow patterns such as vortex shedding and wake-body interaction are carefully investigated during design variable sensitivity analysis. The purpose of this design optimization is to find out the optimal motion that yields maximum thrust and efficiency. The design optimization employes several techniques such as table of orthogonal arrays, Kriging method, ANOVA analysis and MGA. Throughout this research, it is possible to find the optimal values of heaving ratio, heaving shift and pitch shift: Heaving ratio 0.950, heaving shift 23.120˚ and pitch shift 89.991˚ are found to be optimal values in double hydrofoil motions. Thrust and efficiency are 16.7% and 35.1% higher than existing AUV that did not consider nonlinear dependency of motion parameters. This results may offer an effective framework that is applicable to various AUV motion analyses and designs.
박종원,김용기,박소향,홍성준,심창기,김민정,박종호,한은정,소현규,김석철 한국유기농업학회 2016 韓國有機農業學會誌 Vol.24 No.4
This study investigated the effect of organic materials (Bordeaux, Loess-sulfur) and the removal of apical shoot against downy mildew disease on cucumber cultivated in greenhouse. Five kinds of Bordeaux were made by adjusting mixing ratio of lime and copper sulfate in order to elucidate the optimal combination. The 4-6type Bordeaux was selected as the most effective combination for controlling cucumber downy mildew. Loess-sulfur showed inhibitory activity against cucumber downey mildew, but it was less effective than Bordeaux. It was confirmed that apical shoot cutting could reduce the incidence of cucumber downy mildew disease by 56.3%. When apical shoots of susceptible cucumber variety were cut at different leaf stages, disease incidence by early apical shoot cutting treatment was lower than that of late apical shoot cutting treatment. However in a resistant variety, ‘Heukryungsamcheok’, disease incidences of all cucumber apical shoot cutting treatments were lower than that of non-cutting treatment, but there was no differences between apical shoot cutting treatments due to low disease incidences. In addition, when organic materials and apical shoot cutting treatment were carried out in parallel, the combined treatments of organic materials and apical shoot cutting showed low disease incidence of cucumber downy mildew compared to untreated control. The lowest disease incidence of cucumber downy mildew was recorded in the combined treatment of 4-6type Bordeaux and apical shoot cutting. This study confirmed that apical shoot cutting can reduce the disease incidence of cucumber downy mildew and the combined treatment of apical shoot cutting and organic materials showed higher suppressive effect against cucumber downy mildew
ENO interpolation 기반 분해과정을 활용한 다중해상도 유동해석 기법 연구
이용한(Y.H. Lee),조태현(T.H. Jo),구본찬(B.C. Koo),소현규(H.K. So),김도욱(D.W. Kim),이도형(D.H. Lee) 한국전산유체공학회 2018 한국전산유체공학회지 Vol.23 No.1
The improvement of decomposition process using Essentially Non-oscillation Decomposition (ENO) type subdivision scheme on multi-resolution analysis (MRA) based on wavelets basis is studied. The decomposition ability of conventional MRA has a numerical limitation in a flow that involves a shock. ENO interpolation is proposed to improve both decomposition ability and compression rate. The order of subdivision scheme in decomposition process is conserved by changing stencils in the same order. The proposed algorithm is applied to computational flow field around two-dimensional NACA0012 airfoil in subsonic, transonic and supersonic flow regime. Although all cases are improved in terms of compression rate, especially transonic and supersonic cases yield better result than subsonic case. Between transonic and supersonic cases, effects of ENO interpolation are appeared stronger in supersonic case due to the strength of shock. Therefore, it is confirmed that the MRA with ENO-based decomposition could improve the compression rate on flow which is involved a discontinuity.