제1장 농업기계화의 동향 ; 1-2 . 농업기계화의 현황과 전망

최규홍 한국농업기계학회 1990 농업기계연감 Vol.- No.-

Study on Factors Degrading the Accuracy of Real Beam Modal Decomposition

최규홍,김영찬,윤영선,노영철,전창수 한국광학회 2021 Current Optics and Photonics Vol.5 No.2

Three factors that degrade the accuracy of modal decomposition are extensively studied using simulated and measured beams. These include a beam size mismatch, beam center mismatch, and signal-tonoise ratio of the images. The beam size and beam center are scanned using simulated noisy beams, and the result of the modal decomposition is compared with that of real beams. Based on the suggested procedure, error functions of approximately 1–4 × 10 –3 can be acquired for real beams. This study provides important information regarding the impact of the three factors on the practical modal decomposition and tolerances of a mismatch, helping estimate the achievable values of the error function in a real beam modal decomposition.

정지 위성 궤도의 평균 궤도 요소 1 : 궤도의 장반경, 이심률, 근지점 경도

최규홍,이정숙,박종옥,문인상 한국우주과학회 1989 Journal of Astronomy and Space Sciences Vol.6 No.2

農業機械 主要 部品의 化學成分 分析硏究

崔圭洪 건국대학교 1998 學術誌 Vol.32 No.2

Chemical ingredients were analyzed in accordance with the major parts compared with Korean industrial standard to obtain data for bring up to material industry and not happen to fact of quality drop in Korean farm machinery. The results obtained are summarized as follows; 1.In several major parts of farm machinery, the materials were exchanged to low grade from high grade. I think that the reason is cut down for production cost. 2.In the major pants used to rolled carbon steels and special purpose steels, there was used compatible as well as be unsuitable materials for Korean industrial standard in chemical ingredient. 3.In the major parts used to aluminium alloy die casting, steel tubes and casted steel for gings, almost chemical ingredient was suited to Korean industrial standard. 4.Chemical ingredients were almostly un-suitable to Korean industrial standard in the major parts used to alloy castings. 5.The kind of attachment working machinery, power sprayer, thresher, straw cutter used to unsuitable materials to Korean industrial standard in the major parts from manufactured to small maker. I think that urgent problem is quality rice of materials and upbring of material industry in order to stability supply of good quality material in Korean farm machinery.

우리 나라의 揚水機 및 水車 利用에 관한 史的 小考

崔圭洪 건국대학교 농과대학 연합학회 1967 건농 Vol.- No.1

무공화 위성 1호의 발사와 비행궤도

최규홍 한국우주과학회 1996 한국우주과학회보 Vol.5 No.1

로우터리 경운의 부하특성 및 소요동력에 관한 연구

최규홍,류관희 ( Kyu Hong Choi,Kwan Hee Ryu ) 한국농업기계학회 1984 바이오시스템공학 Vol.9 No.2

晋州 南江 流砂量 計算에 關한 硏究

崔圭洪 진주농과대학 1963 진주농과대학 연구논문집 Vol.- No.2

There are various damages caused by transported sediments carried by flowing water in the river. For example, the deposition of sediment on the river bed decreases the river cross-sectional area, and lead to inundation due to the retardation of flow during the flood period, and the deposition of sediment on the reservoir bottom decreases the storage capacity of the reservoir. Therefore, the rate of sediment transport should be considered in designing effective structures in rivers. Since sediment transport is mainly supplied by soils eroded in the drainage area, the amount of sediment transport mainly affects the rate of soil erosion in this area. The measurement of the rate of sediment transpors is necessary to determine the rate of soil erosion for its conservation. No direct method is known at the present time to determine the rate of sediment transport. The several formulas and methods, however, were established theoretically and empirically by some hydraulicians in this subject. Among some methods, theoretical or empirical, Einstein's method which is considered to be one of the most easily applicable methods and possible of acquiring comparatively accurate results was applied in this study. The sediment samples were taken from the bed of the Nam River in the vicinity of chinju city, Kyung Sang Namdo, Korea. The results obtained are as follows; (1) In order to estimate the average annual rate of sediment transport, experiments were carried out at the Nam River, a main tributary of the Nakdong River. (2) The sediment samples consist of 5.52 per cent of gravels larger than 2 millimeters in diameter and 94.48 per cent of sands ranging from 0.05 to 2 millimeters in diameter by the gradation analysis of grain size of sediment samples. Therefore, the value of d65 is equal to 1.03. (3) The geological structures of the drainage area were very simple. Most of them seemed to consist of layerers belonging to the Mesozoic Era. Rocks were sand stone, slate, gravel stone and shale etc. Forests located in the dranage area were devastated. (4) The annual average amount of soil eroded in the drainage asea was estimated to be about 12, 6327 cuqic meters, and that of per unit area was estimated at more than 50 cubic meters per square kilometer. (5) If reservoirs were constructed at the downstream of this river, an average of about 82,113 cubic meters of sediment would be deposited in the reservoir each year. (6) Thus, since the elevation of the river bed rises higher and the cross-sectional area of the river decreases, flood damages would be unavoidable. (7) Soil conservation projects are the only effective way to maintain the protective drainage area against the water flow in this Nam River area. (8) The investigations and studies of sediment transport in the various rivers in this country are very important problems, and the designs and construction works of hydraulic structures should take into account the rate of sediments based an scientifically obtained results.

各種 刈取機의 性能 比較 試驗 硏究

崔圭洪,李哲周 건국대학교 1968 學術誌 Vol.9 No.1

① The aim of this study is on the supply of harvester which has selected as the most suitable one to farm condition after reformation and also on the comparative experiments of efficiency of man power and engine power harvester. ② The results of this study shows that the man power harvester ha94 times of sickle and that of engine power harvester has 7 times, and it also shows the man power harvester is not suitable for wheat cutting. ③ The man power pulling harvester is the most effective one for rice harvesting farm condition for substituting with sickle. ④ It is the urgent problem in the future that a study of harvester with binder which also might be used for wheat harvesting and the study of the new harvester as a attachment of power tiller.

트랙터의 로터리 驅動을 위한 PTO 시스템과 油壓驅動 시스템의 性能 試驗에 關한 硏究

成始興,崔圭洪 建國大學校 附設 自然科學硏究所 1993 建國自然科學硏究誌 Vol.4 No.-

엔진 회전속도 변동에 따른 PTO 회전수, PTO 토크, PTO 출력 및 연료 소비율을 측정하여 기계식과 유압식의 동력 특성을 비교, 분석한 결과는 다음과 같다. 1) 기계식, 유압식 모두 엔진의 회전 속도가 증가할수록 PTO 회전수는 증가하는 경향으로 나타났으며, 기계식이 변속단수 변동에 따른 엔진의 회전속도 폭이 안정적으로 나타난 대 반하여 유압식은 다소 크게 나타났다. 2) 엔진의 회전속도가 증가할수록 기계식, 유압식의 토크는 반비례 관계로 나타났다. 3) 최대 출력은 기계식의 경우 PTO 1, 2, 3단 순으로 나타난 데 비하여 유압식은 PTO 3, 2, 1단 순으로 나타나 PTO 변속 단수가 증가될수록 출력도 증가하는 것으로 나타났다. 4) 연료 소비율은 기계식, 유압식 모두 엔진의 회전수가 증가됨에 따라 연료 소비율은 어느 일정한 회전수 부근에서 최소가 된 후 다시 증가하는 경향으로 나타났다. 5) 유압구동 로터리의 효과적인 이용을 위해서는 유압펌프가 항상 고속으로 회전할 수 있도록 로터리는 어느 일정 회전속도를 유지시켜 작업하는 것이 필요할 것으로 판단되었다. 6) 유압식의 경우 유압펌프의 회전속도가 증가함에 따라 출력 및 연료 소비율이 향상되는 성으로 나타나 기계식에 비하여 효율이 크게 뒤떨어지지 않아 실용화의 가능성이 큰 것으로 생각되었다. The speed of revolution, the PTO torque, the PTO output power, and the specific fuel consumption caused by the variation in the revolution of an engine speed were measured. Therefore, the overall dynamic performance of the hydraulic PTO system was compared and analyzed with that of mechanical PTO system. The results are summarized as follows : 1) Both RPM of the hydraulic PTO and that of the mechanical one increased linearly as the engine speed increased. The engine speed from the variation of a mechanical type was saftly and small changed, but that of a hydraulic type was high changed. 2) Both torques of the hydraulic PTO system and those of the mechanical one decreased linearly as the engine speed increased. 3) The maximum power of the mechanical PTO system was the highest at the first gear of the mechanical one followed by the second one and the third one. However, that of the hydraulic PTO system was at the third gear followed by the second one and the first one. It means that the output power of a hydraulic PTO system increased as the variable PTO gear was increased. 4) After the specific fuel consumption decreased gradually to the specific point, which was required the lowest fuel consumption, then it increased as the engine speed increased. 5) To utilize effectively the hydraulic drive system, this system needs always to be kept revoluting constantly at an engine speed for hydraulic pump to rotate at the high speed. 6) The output power and the specific fuel consumption were improved by using the hydraulic system as the revolution of the engine speed was increased. The performance of hydraulic system was not significant of that of mechanical system. Therefore a hydraulic PTO system, which is convenient for a machine attached it to control automatically, would be utilized in future.