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조규철(G. C. Jo),강인철(I. C. Kang),남정길(J. C. Nam),최재성(J. S. Choi) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
In this paper, the effects of intake manifold systems for volumetric efficiency were investigated in the 4 -cy Linder 4 -cycle diesel engines. The effects were analyzed with resonant speed and volumetric efficiency. Resonant speed was calculated by acoustic theory and volumetric efficiency by method of characteristics. The calculation results were good agree with test results. It was confirned that between the resonant speed and the volumetric efficiency had good relationship, in multi-cylinder engine. As the results, the prediction of resonant speed was useful to design the optimum intake system. It was understood that the intake manifold systems for BOX -type and RAM -type have different characteristics on the trend of volumetric efficiency. Also the procedure to design the desirable intake manifold system was proposed.<br/> <br/>
김동억,이운용,강동현,강인철,홍순중,우영회,Kim, D.E.,Lee, W.Y.,Kang, D.H.,Kang, I.C.,Hong, S.J.,Woo, Y.H. 국립한국농수산대학교 교육개발센터 2016 현장농업연구지 = Journal of practical agricultural resear Vol.18 No.1
Monitoring and control of the greenhouse environment play a decisive role in greenhouse crop production processes. The network system for greenhouse control was developed by using recent technologies of networking and wireless communications. In this paper, a remote monitoring and control system for greenhouse using a smartphone and a computer with internet has been developed. The system provides real-time remote greenhouse integrated management service which collects greenhouse environment information and controls greenhouse facilities based on sensors and equipments network. Graphical user interface for an integrated management system was designed with bases on the HMI and the experimental results showed that a sensor data and device status were collected by integrated management in real-time. Because the sensor data and device status can be displayed on a web page, transmitted using the server program to remote computer and mobile smartphone at the same time. The monitored-data can be downloaded, analyzed and saved from server program in real-time via mobile phone or internet at a remote place. Performance test results of the greenhouse control system has confirmed that all work successfully in accordance with the operating conditions. And data collections and display conditions, event actions, crops and equipments monitoring showed reliable results.
여름철 시설재배에서 일사량에 따른 수시차광이 오이 생육에 미치는 영향
우영회,조일환,이관호,홍규현,오대근,강인철,Woo, Y.H.,Cho, I.H.,Lee, K.H.,Hong, K.H.,Oh, D.G.,Kang, I.C. 국립한국농수산대학교 교육개발센터 2014 현장농업연구지 = Journal of practical agricultural resear Vol.16 No.1
Use of mobile shading helps ameliorate heat stress of cucumber in greenhouse during summer. The mobile shading according to solar radiation may be optimal to produce high-quality cucumber in greenhouse during summer. Simultaneous comparison was made among greenhouse sections that were either not shaded or covered with reflective aluminized shadecloth that shaded 40%, or 90% of direct sunlight. Solar radiation amount, soil temperature, difference in leaf temperature and air temperature, and air temperature were lower, and relative humidity was higher as shade level increased. With increased shade level, photosynthesis rate, leaf area, fresh weight, dry weight, and number of marketable fruits increased. The mobile shading of 90% when the outer sunlight was above 650W·m<sup>-2</sup> yielded favorable growth environment in greenhouse of cucumber during summer.
김동억,이공인,김현환,우영회,이운용,강인철,Kim, D.E.,Lee, G.I.,Kim, H.H.,Woo, Y.H.,Lee, W.Y.,Kang, I.C. 국립한국농수산대학교 교육개발센터 2015 현장농업연구지 = Journal of practical agricultural resear Vol.17 No.1
This study was conducted to develop the fertigation system with a peristaltic hose pump and brushless DC motor. The fertigation system was consisted of sensor, main controller, motor control unit, peristaltic pump, water supply pump, control panel, and filter. The peristaltic pump discharges liquid by squeezing the tube with rollers. Rollers attached to the external circumference of the rotor compresses the flexible tube. The fluid is contained within a flexible tube fitted inside a circular pump casing. The developed fertigation system has no mixing tank but instead injects directly a concentrated nutrient solution into a water supply pipe. The revolution speed of the peristaltic pump is controlled by PWM (Pulse width modulation) method. When the revolution speed of the peristaltic pump was 300rpm, the flow rate of the 3.2, 4.8, 6.3mm diameter tube was 202, 530, 857mL/min, respectively. As increasing revolution speed, the flow rate of the peristaltic pump linearly increased. As the inner diameter of a tube larger, a slope of graph is more steep. Flow rate of three roller was more than that of four roller. Flow rate of a norprene tube with good restoring force was more than that of a pharmed tube. As EC sensor probe was installed in direct piping in comparison with bypass piping showed good performance. After starting the system, it took 16~17 seconds to stabilize EC. The maximum value of EC was 1.44~1.7dS/m at a setting value of 1.4dS/m. The developed fertigation system showed ±0.06dS/m deviation from the setting value of EC. In field test, Cucumber plants generally showed good growth. From these findings, this fertigation system can be appropriately suitable for fertigation culture for crops.
장창환,강인철 국민대학교 2002 北岳論叢 Vol.19 No.-
The effect of wave breaking and current on eddy viscosity was described by using a 1DV numerical model with one-equation turbulence closure. The turbulent kinetic energy generated from the wave breaking was supplied at the water surface, and was diffused down into the whole water column. While the breaking-induced turbulence are diffused in the water column, the vertical diffusion coefficient was modified by the additional turbulent kinetic energy. The model was applied to six wave flow cases and two wave and current flow cases to assess the effect of the wave breaking and the current. The eddy viscosity or vertical diffusion coefficient was obtained from a simple relationship between the eddy viscosity and the mixing length and the turbulent kinetic energy. The model results on the horizontal velocity profile, the turbulent kinetic energy profile, and the diffusion coefficient profile were compared with laboratory measurements, and showed reasonable agreement. The diffusion coefficient was significantly enhanced by about 40000 % at the middle of wave boundary layer due to wave-breaking for CASE 1, while it was enhanced by about 200 % due to a current for CASE 1-2.