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제직 시스템에서 Step Input과 Ramp Input이 경사장력 변동에 미치는 영향에 관한 연구
윤성후,장승호,허유,Yoon, Seong-Hoo,Jang, Sung-Ho,Huh, You 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.8
The tension variation of warp yarns in the weaving process is one of the most important factors determining the irregularity of weft density in woven fabrics. Particularly, when the loom starts up, the tension of warp yarns varies greatly. So it is necessary to control this tension variation. In this research, to reduce the tension variation of warp yarns during start up, we adopted the active negative control of the let-off speed. First, the weaving mechanism was modeled, and the model was linearized to establish the system that controls the tension of warp yarns with let-off speed. Then, the tension of warp yarns was predicted by simulation. In simulation, the take-up speed regarded as mechanical disturbance was modified by the input of step and ramp types. The results of simulation were confirmed by experiments. In experiments, an individual servomotor drove the let-off system and the tension of warp yarns was measured by the backrest movement. A load-cell was connected to the spring to measure the tension of warp yarns. As a result, it was found that the ramp type in the take-up speed was better than step type in controlling the warp tension when the loom started up in both simulation and experiment.
제직 시스템에 있어서 Ramp Type의 Take-up Speed가 경사장력의 변동에 미치는 영향에 관한 연구
윤성후,장승호,허유,Yoon, Seong-Hoo,Jang, Sung-Ho,Huh, You 한국섬유공학회 2001 한국섬유공학회지 Vol.38 No.2
As high-speed weaving technologies are developed, the control of the warp tension during weaving process becomes one of the most important issues in weaving industry. In innovatory looms, many types of warp tension control methods were introduced. An active negative type of let-off mechanism is one of the most advanced methods. In this study, the active negative type of let-off mechanism was used to control the warp tension and the take-up speed of the weaving system was regarded as a mechanical disturbance of the system because this could cause an excessive variation of warp tension when the loom started up. Usually, the take-up speed goes to the final value after some transient state when used an on/off switch that can be regard as a step type of the input of the system. Thus an excessive take-up speed causes a variation of warp tension. To reduce this variation, take-up speed was changed in "ramp type" that had a slope until it reached the final warp tension value, which can be comparable with the on/off switch. Then the slopes of ramp type of take-up speed were optimized. The optimum slope was found by simulation and confirmed by experiments. From the results of this study, it can be concluded that 1) it is valuable to change the behavior of the main motor speed by "ramp type" and 2) although this new type of take-up speed behavior could not reduce all of the variation of the warp tension, it could control this variation well enough to reduce the stop marks.top marks.
이정환(Jung-Hwan Lee),박혜리(Herie Park),최은혁(Eun-Hyeok Choi),장승호(Seong-Ho Jang),이광식(Kwang-Sik Lee) 한국조명·전기설비학회 2009 조명·전기설비학회논문지 Vol.23 No.10
본 논문은 Knife 전극을 사용했을 때 친환경 절연가스인 N₂:O₂(100[%]:0[%]) 및 N₂:O₂(80[%]:20[%], I-Air), N₂:O₂(60[%]:40[%])의 혼합가스 및 SF6 중 Teflon 수지에서의 연면절연특성을 구명하여 절연설계 시에 응용 가능한 기초자료를 제공하고자 한다. 사용한 전극은 Knife형 전극으로써, 거리 및 압력을 조정하며 절연가스의 종류에 따른 연면절연파괴전압, 연면방전 전계강도를 비교분석하였다. 혼합가스 중에 평균 연면절연파괴전압은 I-Air가 가장 높게 나타났다. 또한 SF?의 연면방전전계강도는 I-Air의 약 2배 정도로 나타났다. This paper reviews a basic data of the surface discharge characteristics for teflon resin in not only pure N₂, N₂:O₂(80[%]:20[%], I-Air) and N₂:O₂(60[%]:40[%]) mixture gas as environment-friendly insulation Gas also SF?. Used electrodes are Knife to Knife. With the changing distance of electrodes and pressure, we can find it, surface discharge voltages and surface dielectric strengths, respectively. Surface discharge Voltages of I-Air are more higher than the other N₂/O₂ mixture gases. Moreover, we can obtain that the surface dielectric strengths of SF? are two times about I-Air, approximately.
XO/HX에 의해 손상된 배양 심근세포에 대한 枳實해백桂枝湯 과 구성약물 추출물의 방어효과
장승호,권강범,김인수,강길성,김인규,김인섭,류도곤 대한동의생리학회,대한동의병리학회 2003 동의생리병리학회지 Vol.17 No.4
To certify the protective effect of herbal medicine against oxygen free radical-induced myocardiotoxicity, cytotoxicity was measured using LDH activity and TBARS assay in the presence of Jisilhaebaekgyejitang(JHGT) extracts or single constituents of this prescription. In the present study, xanthine oxidase/hypoxanthine (XO/HX) resulted in a cell damage such as increases in LDH activity in culture medium and lipid peroxidation in cultured myocardial cells. In the effect of JHGT extract and its singe constituents, which are Fructus Ponciri Seu Aurantii lmmaturus (FPSAl), Cortex Magnoliae Officinalis (CMO), Bulbus Allii Macrostemi (BAM), Ramulus Cinnamomi (RC) and Fructus Trichosanthis (FT), they showed the prevention from the XO/HX-induced cardiotoxicity by the decrease of LDH activity and lipid peroxidation. From these results, they show that XO/HX is cardiotoxic in cultured myocardial cells derived from neonatal rat, and it suggests that JHGT, FPSAl, PT, CMO, BAM, RC and FT extracts are positively effective in the blocking in XO/HX-induced cardiotoxicity.
석유화학 플랜트 배관계의 응력 및 진동 평가와 적용에 관한 연구
민선규,최명진,장승호 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.3
Here are shown on stress and vibration evaluations and applications of piping system in petrochemical plant with an actual example. While stress evaluation by thermal growth has no argument on the calculated results, vibrational evaluations have some different results in accordance with the evaluation methods. In case of the static stress evaluation, the ASME B31.3 code defines 7000 cycles of fatigue life in operating the piping system with a design condition. However, the method of vibrational evaluation on piping systems in petrochemical plants has now been established clearly, yet, In this study, it is purposed to present the requirement of a vibrational evaluation method for petrochemical plant piping systems, with an actual application.