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서상룡,에프 디 해리스 ( Sang Ryong Suh,F . D . Harris ) 한국농업기계학회 1984 바이오시스템공학 Vol.9 No.2
디이겔엔진의 代替燃料 로서 大豆油는 大豆油의 높은 粘性에 起因하는 문제점이 지적되고 있다. 이의 해결방법으로 大豆油와 디이제러油결 混合, 大豆油의 에스테르化 그리고 디이젤油 添加劑의 添加 등이 제시되고 있다. 本硏究는, 大豆油, 그의 에틸 에스테르 그리고 이러한 代替燃料의 디이젤油와 混合物 또는 그 混合物 의 添加劑와의 混合物의 粘性學的 性質과 그 크기를 實驗的 方法으로 구하였다. 그 결과 상기의 液休는 모두 뉴톤니안 液休이고, 添加劑는 상기 混合物의 粘性을 낮추는데 별로 효과가 없는 것으로 .판단되었다. N/A
포대단위(包袋單位) 곡물건조방법(穀物乾燥方法)의 개발(開發)에 관(關)한 연구(硏究)
서상룡 ( Sang Ryong Suh ),최재갑 ( Jae Kap Choi ) 한국농공학회 1975 韓國農工學會誌 : 전원과 자원 Vol.17 No.4
This study was carried out to develop a method of grain drying ststem that can be done by forcing the heated-air directly into the grains within the sack. The air duct was pushed into the central position of the grain-deposited sack and the heated-air was forced to flow in the radial direction. The system is referred here as the unit sack drying system. At a first step of this study, an air flow resistance tester was constructed to measure the resistance of air flow to grains in cooperated with some different sack materials, the sack materials, the tested were rice-straw bag, sack of polyethylene film, and jute sack In addition, unit sack drying system was constructed to investigate the drying characteristics of the dryer. on this dryer, two kind of terminal air ducts were attached and tested to examine its effects on uniform drying, and also, aseries of drying test was performed to trace the effect of increasing air flow rate on uniform drying. The results are as follows: 1) Resistance of air flow for each sack material was increased almost proportional to the increasing rate of air flow. Experimental data showed little significant differences of the air flow resistance among the materials. 2) From the comparison with air flow resistance of sack material and that of roughrice, it was indicated that airflow resistance of sack material was much higher than that of rice rough Therefore, in the unit sack drying sysle in which air flow is destined to face the sach material after leaving the grain, it was suggested that air flow would be inuniform to each part of grain within sack because of much higher air flow resistance of sack material than that of grain, and the fact would results inuniform grain drying. 3) Drying test on the unit sack drying system in cooperated with different type of terminal air ducts showed that high speed air is better for uniform drying than in high pressure. with the drying system which was assembled with the air ducts delivering higher speed air, there also involved a problem of significant inuniform drying. Therefore, any means to improve the inuniform drying should be undertaken for practical use. 4) A series of drying test with in creasing air flow rate resulted that increasing air flow rate in the unitsack drying system gave little effect on uniform drying, therefore, it is recommened to change its drying system for drying grain uniformly.
논문 : 정보처리 및 복합기술 ; 레이저 역산란 광 영상분석에 의한 배 경도 예측
이경환 ( Kyeong Hwan Lee ),서상룡 ( Sang Ryong Suh ),유승화 ( Seung Hwa Yu ),유수남 ( Soo Nan Yoo ),최영수 ( Young Soo Choi ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.5
The overall goal of this study was to examine the feasibility of predicting firmness of pear fruit by analyzing laser-induced light backscattering images. Thirty-five image analysis characteristics extracted from the laser-induced light backscattering images were used to build partial least squares regression (PLSR) models for predicting firmness of pear fruit. Experiments were conducted with three sets of pear samples which were in same "Shingo" cultivar, harvested in a same season, but produced in different counties. In every experiments with fruit samples produced in a same county, the correlation coefficients of prediction (rp) and root mean square errors of prediction (RMSEP) of the models were 0.550~0.761 and 4.039~6.154 N, respectively. In an experiment with mixed fruit samples produced in different counties, the rp and RMSEP of the model were 0.669 and 5.02 N, respectively. The experiment results indicate that the analysis of laser-induced light backscattering images could be a useful tool for predicting firmness of pear fruit nondestructively.
논문 : 노외기계시스템공학 ; 75 kW 이상 농용트랙터 작업실태 분석
한득희 ( Deuk Hee Han ),강성일 ( Sung Il Kang ),유수남 ( Soo Nan Yoo ),서상룡 ( Sang Ryong Suh ),최영수 ( Young Soo Choi ),강영선 ( Young Seon Kang ),박승제 ( Seung Je Park ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.6
In this study, surveys on operation status of the 73 tractors with rated power of over 75 kW from six provinces in Korea were performed to obtain basic data required for development and efficient use of the high-power and high-performance tractors. And types of tractors and implements, operation crops, types of operations, annual operation areas, annual operation days, annual operation hours, operation speeds and widths, and problems and improvements in use were investigated. Most (91.7%) of the tractor surveyed were operated for forage and silage crops such as rice straw, whole barley, rye grass, reed canary grass, sudan grass, and the remains were operated for upland crops such as ginseng, sweet potato, potato, chinese cabbage, radish. Main operations of the tractors were cutting, baling, and wrapping for forage crops, plow tillage, rotary tillage, and manure spreading. About half (47.9%) of the tractors were used exclusively for forage crop harvesting such as forage crop cutting, forage baling, and bale wrapping, 24.5% of the tractors were used exclusively for plow or rotary tillage, and 27.4% of the tractors were used for both forage crop harvesting, and plow or rotary tillage. For the tractors with power ranges of 75∼83, 89∼94, 98∼101, 113, 124 kW, average annual operation areas per tractor for plow tillage, rotary tillage, forage crop harvesting (cutting, baling, wrapping), and manure spreading operations were analyzed as 112.6. 144.8, 158.9. 390.0. 215.6 ha, respectively. and total average annual operation area per tractor was 171.3 ha. Average annual operation days per tractor for those operations were analyzed as 24.1, 28.9, 38.3, 55.4, 33.4, respectively, and total average annual operation days per tractor was 33.6. Average annual operation hours per tractor for them were analyzed as 260.0, 321.6, 408.1, 664.8, 413.8, respectively, and total average annual operation hours per tractor for the all tractors was 377.1. Ranges of operation widths of plow tillage, rotary tillage, forage crop cutting, forage baling, bale wrapping, and manure spreading operations were shown as 1.5∼2.6, 2.3∼3.0, 1.8∼3.2, 1.8∼2.0, 1.8∼2.3, 3.1∼6.6 m, respectively. Ranges of operation speed of plow tillage, rotary tillage, forage crop cutting, forage baling, bale wrapping, and manure spreading were shown as 6∼9, 4∼11, 9∼16, 8∼15, 8∼17, 12∼16 km/h, respectively.