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송두상(Doo-Sang Song),홍준희(Jun-Hee Hong),류상현(Sang-Hyun Ryu) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.4
This study investigates the detection system of oil pollution level using single optical fiber sensor. This study focus on sensing of oil pollution by moisture and iron powder which are representatives of oil pollution factor. In addition, It is placed that the water and iron powder as an oil pollution factor in the oil tank which is the oil circulation in. The oil pollution detection system was measured by the changing of intensity of light and sensing gap. The result of this experimentation not only confirmed the contamination by moisture volume in the oil tank from the section 190ppm to 540ppm, but also monitored the contamination by iron volume from the section 1200ppm to 3500ppm. This study confirmed effectiveness of this detection system using optical fiber sensor. There is expectations of measuring another section by various optical fiber sensor.
송두상(Doo Sang Song),홍준희(Jun Hee Hong),정황영(Hwang Young Jeong),강대화(Dae Hwa Kang),김병인(Byung In Kim) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.4
In this paper, we studied of measurement the vibration of natural frequency using optical fiber sensor. The boring bar for measurement of vibration in use optical fiber sensor has the advantage of direct measure for the frequency than accelerometer. Because it deal with output value on electrical signal of optical fiber in physical disturbance when it measures the frequency of vibration. The optical fiber sensor measured the vibration of boring bar by the gap in sensing jig while optical fiber just kept contact with boring bar. A prototype system was composed of jig part with gap and optical system part. In this paper, we found out the possibility to measurement of vibration by the gap in use optical fiber.
송두상(Doo Sang Song),홍준희(Jun Hee Hong),곽양양(Yang Yang Guo) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.6
Chattering in cutting operations are usually a cumbersome part of the manufacturing process in mechanical. Particular, machining performance such as that of the boring process is limited by cutting condition at the movable components. Among various sources of chatter vibration, detrimental point in cutting condition is found a mechanical condition on overhang. It limits cutting speed, depth, surface roughness and tool wear failure as result because the all properties are varying with the metal removal process. In this case, we have to observe the resonance frequencies of a boring bar for continuous cutting. In the established research, boring bar vibration of cutting system has been measured with the aid of accelerometer. However, the inherent parameters of internal turning operations are severely limit for the real time monitoring on accelerometers. At this point, this paper is proposed other method for real time monitoring during continuous cutting with optical fiber at the inside of boring bar. This method has been used a plastic fiber in the special jig on boring bar by based on experimental modal analysis. In this study, improvement of monitoring system on continuous internal cutting was attempted using optical fiber sensor of inside type because usually chattering is investigated experimentally measuring the variation in chip thickness. It is demonstrated that the optical fiber sensor is possibility to measure of chattering with real time in boring process.
정황영(Hwang-Young Jeong),송두상(Doo-Sang Song),홍준희(Jun-Hee Hong) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.2
The purpose of this study is to develop special tools used to extend the tool life for the boom of heavy equipment. The boom of heavy equipment is manufactured by cutting the inner and outer surface with respect to the assembly site essential. In particular, when cutting the inner surface, entry of the tool is difficult owing to the limited size of the inner diameter and non circular cutting. In addition, the productivity is poor because the use of the cutting tool made of the SKH material. Therefore, it is necessary to develop a special tool for machining heavy equipment boom to extend tool life and to improve productivity. The special tool developed this study has the form of a holder and tip. The tip was created by applying a commercially available tungsten carbide insert.
근권제한 및 단근 처리가 ‘서촌조생’ 감나무의 수체생육, 수량 및 과실 품질에 미치는 영향
최성태(Seong-Tae Choi),박두상(Doo-Sang Park),윤영황(Young-Hwang Yoon),송원두(Won-Doo Song),손길만(Gil-Man Shon),노치웅(Chi-Woong Rho),강성모(Seong-Mo Kang) 한국원예학회 2005 원예과학기술지 Vol.23 No.2
근권제한과 단근 처리가 ‘서촌조생’ 감나무의 수체생장, 수량, 과실 품질에 미치는 영향을 구명하기 위하여 1997년부터 2004년까지 본 시험을 수행하였다. 1997년 3월에 근권을 제한하기 위하여 폭 50㎝, 깊이 45㎝의 도랑식 구덩이를 파고 비닐(비닐 근권제한구) 또는 부직포(부직포 근권제한구)를 구덩이 옆과 아래에 펴고 열간거리 2m, 주간거리 1m로 나무를 심은 근권제한 처리구와 근권제한 조치 없이 재식 이듬해부터 매년 발아 전에 주간 양쪽 50㎝ 거리에서, 45㎝ 깊이로 토양을 파 뿌리를 절단한 단근구, 그리고 무처리의 대조구를 두었다. 근권제한 또는 단근 처리로 수고, 수폭, 주간단면적, 엽면적, 도장지 발생, 지상부 생체중이 재식 4년차부터 뚜렷하게 감소되었는데 부직포 근권제한구에서 그 효과가 가장 컸다. 2003년까지 6년간 총전정량도 부직포 근권제한구가 가장 적었으며, 다음으로 비닐 근권제한, 단근구 순이었다. 재식 8년차 3월에 뿌리를 굴취 해 본 결과, 비닐 및 부직포 근권제한구에서 근권제한 부위 바깥에 세근 및 중근이 부분적으로 뚫고 나간 것이 관찰되었다. 비닐 근권제한구는 근권제한 부위 내에 뿌리 밀도가 가장 높고, 단근구는 단근 부근에서 세근과 중근이 많은 것이 특징이었다. 주당 누적수량은 재식 5년차부터 대조구에서 많았으나 통계적 유의성이 인정될 정도는 아니었으며, 수량효율은 재식 6년차부터 부직포 근권제한구에서 높은 경향이었다. 재식 3년차부터 5년간 평균과중은 대조구 146g에 비해 부직포 근권제한구 142g, 비닐 근권제한구 141g, 단근구 138g 순으로 작았던 반면, 수확일은 대조구보다 각각 3, 4, 2일이 빨랐다. This experiment was conducted to determine the effects of root restriction and root pruning on tree growth, yield, and fruit quality of ‘Nishimurawase’ persimmon from 1997 to 2004. The trees were planted in 50 ㎝-wide, 45 ㎝-deep trenches lined with either polyethylene (PE) film or non-woven fabric. The rows were 2 m apart and the in-row tree spacing was 1 m. A block of trees were root-pruned annually from 1998. The root pruning was done before bud-break by digging and replacing the soil on two sides of the trunk at 50 ㎝ to a depth of 45 ㎝. Root zone of control trees was left untouched until 2004. Root restriction or root pruning significantly decreased tree height, tree spread, trunk cross-sectional area (TCSA), leaf area, number of water sprouts, and fresh weight of above-ground parts. Reductions in tree growth were apparent from the fourth year after planting. The most reduction was found in the trees with non-woven fabric. Cumulative pruning weight was also reduced most in the trees lined with non-woven fabric, followed by the trees with PE film and root-pruned. When excavated in March of the eighth year after planting, it was noted that a few roots were grown through the PE film and the non-woven fabric. Root weight within the restricted zone was the greatest in the trees with PE film, whereas much of fine and medium roots were found near to the cut surface in root-pruned trees. Although not significant, cumulative yield per tree tended to be high in control trees from the fifth year after planting while yield efficiency in the trees with non-woven fabric from the sixth. Average fruit weights during the 5 years from the third year were 146 g in the control, 142 g in non-woven fabric, 141 g in PE film, and 138 g in root-pruned trees, exhibiting some negative effects of root restriction and root pruning on fruit size. However, the fruits matured 3, 4, and 2 days earlier, respectively, than those of the control.