임도정공장 (賃搗精工場) 미곡 도정실태

김용환,서상룡,김성태,나우정,강화석,민영봉 ( Yong Hwan Kim,Sang Ryong Suh,Sung Tae Kim,Woo Jung La,Whoa Seug Kang,Young Bong Min ) 한국농업기계학회 1979 바이오시스템공학 Vol.4 No.2

연구보문 : 참깨 파종작업 개선을 위한 종자과립화의 최적기술

김석현 ( Seok Hyeon Kim ),나우정 ( Woo Jung La ),민태기 ( Tai Gi Min ) 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.2

참깨 재배 시 적량파종에 의한 솎음노력 절감을 위하여 종자를 과립처리 하였다. 과립시 사용된 고형물질과 폴리머의 최적처리조건을 규명하고자 하였다. 또한 운반성이나 기계파종을 고려한 경도, 점성과 함수능력, 제조의 편리성, 파종 후 파 쇄력 등의 단독과립에서의 약점을 보완하기 위하여 앞 단계에서 사용한 수용성 접착제와 고형물질 중 최적물질을 몇 가지 도출하여 이것을 다시 고형물질 2~3가지를 순차적으로 과립하는 중복과립(double pelleting)을 실시하였다. 실내에서 발아 시험을 실시하여 실용성을 검토하였다. 1. 과립 시 사용된 고형물질 중에서 질석, 활석, 피트모스, 펄라이트가 외형형성정도와 균일도 및 경도 면에서 우수했으며 이들 고형물질의 입자크기가 작을수록, 무게가 가벼울수록 과립이 잘 되었다. 폴리머 중에서 PVA가 가장 좋았으며 1.0%보다는 2.0%에서 경도가 높았다. 2. 과립기 회전 드럼의 각도와 회전속도의 적절한 조절은 성공적인 과립을 위해 매우 중요하다. 코팅단계에는 과립제조기 드럼의 회전수를 37 rpm로, 경사각은 25°, 과립성형단계에는 과립제조기 드럼의 회전수를 65rpm로, 경사각은 25°, 경화단 계에는 과립제조기 드럼의 회전수를 73 rpm로, 경사각은 30°로 하는 것이 바람직하다. 3. 질석(1)+펄라이트(4)+활석(1)의 비율로 중복 과립 시 발아속도가 빠르고, 12일째 발아율도 90%로 대조구 91%와 동일하게 높으므로 과립의 형성도와 발아율을 함께 고려해 보면 이들 비율로 복합 처리함이 최적조합으로 판단 된다. Seed pelleting was performed for labor-saving in sowing and thinning of seedlings in sesame fields. Efficiency of the solid materials and polymers used for pelleting and the processes and methods applied were compared. Hardness, viscosity and hydration capacity, convenience in pelleting process, dehiscence after sowing that was known as disadvantages of the seed coated with single material were analyzed after pelleting with different solids and polymers. To overcome the disadvantages, selected soluble stickers and solid materials were applied to double pelleting procedure in which the stickers and solids were used sequentially. The germination performance of pellet seeds was influenced by solid materials. As the particle size and weight of vermiculite, talcum, peatmoss and perlite those showed good results in shaping capacity, uniformity and hardness were reduced, seed pelleting were performed well. PVA selected from tested polymers showed higher hardness when applied at the rate of 1.0% as compared to the rate of 2.0%. Pelleting was highly dependent on the angle of rotating drum and rotating speed, the optimal speed and angle were 37 rpm and 25°, respectively, for coating stage, 65 rpm and 25° for pellet formation stage and 73 rpm and 30° for solidification stage, respectively. The double pelleting with the combination of vermiculite (1) + perlite (4) + talcum (1) was the most effective treatment in terms of germination and shaping. The treatment resulted in a relatively higher germination rate of 90% that was not decreased significantly as compared to the value of control (91%) at 12 days after treatment.

농가의 미곡저장실태

김용환,서상룡,김성태,나우정,민영봉 ( Yong Hwan Kim,Sang Ryong Suh,Sung Tae Kim,Woo Jung La,Young Bong Min ) 한국농업기계학회 1980 바이오시스템공학 Vol.5 No.1

농공이용연구실편 : 임도정공장 미곡 도정실태

김용환(Yong Hwan Kim),서상용(Sang Ryong Suh),김성태(Sung Tae Kim),나우정(Woo Jung La),강화석(Whoa Seug Kang),민영봉(Young Bong Min) 강원대학교 농업과학연구소 1989 강원 농업생명환경연구 Vol.3 No.-

온실지붕 차광과 수막 수준에 따른 냉방효과 분석

김영복(Young-Bok Kim),박중춘(Joong-Chun Park),이승규(Seung-Kyu Lee),김성태(Sung-Tae Kim),나우정(Woo-Jung La),허무룡(Moo-Ryong Huh),정성우(Sung-Woo Jeong) (사)한국생물환경조절학회 2006 생물환경조절학회지 Vol.15 No.4

하절기 온실재배가 늘어나고 적극적인 온실냉방에 필요해짐에 따라 저비용의 냉방법 개발이 매우 중요해졌다. 경제적인 냉방법을 개발하기 위하여 차광율 수준과 물흘림의 상태가 냉각효과에 미치는 영향을 분석하고자 하였다. 실험분석을 위해 온실모형 모듈을 제작하여 차광율수준과 물흘림수준을 조합 변화시켜가며 경시별 측정을 수행하고 변수의 수준별로 비교분석하였다. 1. 외기건구온도가 상승하면 모듈실내온도도 상승하는 경향이며, 차광막이 있고 물흘림이 있으면 대체적으로 외기온보다는 낮고 물온도보다는 높은 수준을 나타내고 있다. 한편, 물흘림이 없는 경우에는 치광율의 수준간 건구온도변화가 크지 않은 것으로 나타나고 있다. 물흘림이 없이 차광막만 있는 경우 차광율의 수준이 35%에서 75%로 높아질수록 평균내부온도는 낮아졌지만 외부보다는 1.7~4℃ 정도의 높은 온도를 나타내었다. 그러나 물흘림과 차광이 동시에 이루어지는 경우 전체적으로 외부온도보다 낮은 가운데 그 차이가 -0.2~-1.2℃ 정도로 외기평균보다 낮게 나타났다. 그러나 물흘림 수준에 따라서는 차이가 나타나지 않았으며, 물흘림은 골고루 분포되도록 분무해 줄 필요가 있는 것으로 판단되었다. 공급되는 물의 온도는 실내용도에 영향을 주지 않는 것으로 나타났다. 2. 차광율수준이 높을 수록 모듈내 흑구온도는 낮게 나타났다. 그러나 치광막만 설치하여서는 외부의 복사광 차단에 의한 냉각효과를 기대하기 어려우며 차광막과 함께 물흘림을 병행해야 복사광 차단과 함께 복사 냉각효과를 함께 얻을 수 있다는 것을 알 수 있었다. 3. 물흘림이 있는 경우 표면온도는 수온이하이거나 수온보다 높더라도 1.2℃ 이상을 넘지 않았으며, 차광수준이 높을수록 표면온도는 더 낮게 나타났다. 그 이유는 물의 증발냉각에 의해 표면이 냉각되기 때문으로 분석되었다. 필름표면온도의 평균은 차광막의 수준에 관계없이 비교적 일정한 값을 나타내었으나 물흘림이 없는 경우 차광율의 수준이 놓을 수록 평균온도는 높게 나타났던 바 이는 차광에 의해 외부 복사광이 차광막에 흡수되었기 때문으로 판단되었다. 4. 상대습도는 건구온도가 증가함에 따라 비교적 직선적으로 하강하였으며, 이는 수분의 공급이 따로 이루 어지지 않는 한 절대습도가 일정하기 때문에 건구온도가 상승하면 자연스럽게 하강하게 되는 것으로 판단되었다. 차광막에 있거나 물흘림이 있는 경우에는 외기건구온도의 영향에는 영향을 받지 않고 모듈내 건구온도에 따라 변하는 것으로 나타났다. In this study, the effect of the shade level, water flow rate applied to the shades and the temperature of water on the greenhouse cooling was investigated depending on the shade level of 0, 35, 55, 75%, and water flow rate and water temperature by the test on the small wooden frames to find out the low cost cooling method. With increasing of the dry bulb temperature of outside air, the dry bulb temperature in the wooden frames increased. For the frames with the shade and water, inside temperatures of the frames were lower of -0.2~-1.2℃ than the temperature of the outside air and higher than the water temperature. For the frames without water, inside temperatures of the frames were higher of 1.7~4℃ than the outside and not affected by the shade level very much. The water flow rate and the temperature of the water were not the important factors to decrease the inside temperatures in the frames. The black globe temperature became lower with increasing of shade level. The shade frames with water curtain showed the best cooling effect because of reducing thermal radiation and cooling the plastic film cover. The surface temperatures of the plastic film cover for the water supplied modules became lower with increasing of the shade level. The relative humidity was decreased with the dry bulb temperature in the frame increasing and not affected by the dry bulb temperature of the outside air for the frames with the shade and water.

3個의 耕耘날을 利用한 平衡振動式 耕耘裝置(Ⅲ) : 垂直加振時의 振動特性 Characteristics of Vibration Induced by Vertical Oscillation

金容煥,金成泰,羅又禎 慶尙大學校 1984 論文集 Vol.23 No.2

This is the third of series of reports on the study on a balanced type oscillating tillage implement using triple blades system. Previous reports of this study, the characteristics of vibration and power requirement induced by horizontal oscillation were presented. In this paper, the vertical and horizontal vibration tendency due to the various oscillating frequencies, amplitudes, lift angles and travel speeds appeared by vertical oscillation were investigated. Obtained results are as follows: 1. Oscillating accelerations on the vertical and horizontal direction were decreased by increased travel speed, and were increased by increased oscillating frequency and amplitude. 2. The lowest oscillating acceleration in each direction was shown at the condition of travel speed 0.2m/s, oscillating frequency 7.5Hz, amplitude 2mm and lift angle was 30℃. But there must be considered at the same time the side of view for total power requirement, tillage effect, and reduction effect of oscillating acceleration to determine the optimum condition of the instrument. 3. Triple blades tillage implement, using these studies, was shown a great potential capacity for the side of reduction effect of oscillating acceleration, compare with many other non-balanced oscillating tillage systems.

??형 超音波 噴霧器에 依한 세탄液滴의 微粒化 特性

李智弘,鄭鎭度,羅又禎 慶尙大學校 1991 論文集 Vol.30 No.2

This study was performed to figure out the atomization characteristics of free-falling oetane droplets from a π-type ultrasonic vibrator dircted downwards. Droplets were collected by the magnesium oxide immersion method. The diameter and distribution of droplets were measured and analyzed. The results are summarized as following : 1. The shape of free-falling oetane droplets in space from the π-type ultrasonic vibrator was fully developed promixed spray column, showing almost the same diameter as the outer diameter of the horn through its whold length. 2. The mean of the Sauter mean diameter of the collected cetane droplets was 52.8㎛, and, its maximum and minimum droplet diameters were approximately 95 ㎛ and 15 ㎛, respectively. 3. The distribution types of droplet size were right-skewed Gaussian distribution curve in all cases with small variace. The Sauter mean diameters ranged from 48 ㎛ to 59 ㎛.

굴절률이 Dual-Beam LDV의 信號特性에 미치는 影響

朱恩選,羅又禎 慶尙大學校 1986 論文集 Vol.25 No.2

The effects of refractive indices on the visibility which is an important characteristic in a Dual-Beam LDV are investigated. There are two methods for experiment; One is in the case of the variety of refractive indices of scatterers, and the other in the case of the variety of refractive indices of media. In this study, the above second method was selected in order to find that the refractive index is an important parameter on the visibility. A resistance wire with 30㎛ width and a Pt wire with 50㎛ width were applied as scatterers. Five media, ie., H2O(n=1.332), Chloroform (n=1.444), DMSO (n=1.476), Benzyl alcohol (n=1.538) and Carbondisulfide (n=1.628), were used as surrounding media. In the result, it is found that the refractive index of scatter is a parameter of the visibility.

貫入을 받는 表土의 리올러지 特性 : 貫入抵抗應力弛綬 Penetration Stresss Relaxation

羅又禎 慶尙大學校 1991 論文集 Vol.30 No.2

This study was carried out to figure out the effect of the moisture content and the penetration rate on the penetratin stress relaxation behavior of the surface soil of a loamy sand under laboratory conditions. The following results were obtained from the study. 1. The penetration stress relaxation characteristics of the surface of a loamy sand can be described by a generalized Maxwell model consisting of the Maxwell elements. 2. At the moisture content of 20% and penetration speed of 50 mm/min, for all the probes, residual stresses were the greatest, being about 65∼68% of initial stress. And relaxation intensity of the second element was the greatest at the same condition. 3. With the increase of penetration speed, the rate of the decrease of residual stress was increased and relaxation intensity was increased, too.

고점성 바이오유의 미립화를 위한 초음파의 적용

주은선,나우정,김종천 慶尙大學校生産技術硏究所 1996 生産技術硏究所論文集 Vol.12 No.-

An experiment was conducted to figure out the atomization characteristics of rice-bran oil which is a highly viscous liquid by applying ultrasonic energy to improve the atomization of spray droplets. A spray simulator, an ultrasonic system, and six different nozzles(three kinds of single hole-type nozzles and three kinds of pintle-type nozzles) were made. To investigate the effects of ultrasonic energy on the atomization of a highly viscous liquid, a phase doppler particle analyzer was used for measurement and calculation of spray droplets data. Nozzle opening pressures chosen were of 5 levels, i. e., 10 MPa, 13 MPa, 16 MPa, 20 MPa, and 24 MPa. It was observed that the application of ultrasonic energy into the highly viscous rice-bran oil was effective for the atomization improvement of the liquid fuel. With the increase of nozzle opening pressures and pin-edge angles, and with the decrease of the hole diameters, the atomization of spray droplets was improved, which conforms to general theoretical characteristics.