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정성훈,Sahito, Iftikhar Ali,Arbab, Alvira Ayoub,Jeong, Sung Hoon 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.1
Producing yarn from natural fibers without creating irregularities in structure or having fibers protruding from the surface, remains the goal of spinners. This is a problem, as structural irregularities such as hairiness affect subsequent fabric manufacturing processes and the aesthetics of the final fabric. This work therefore focused on investigating the effects of varying the spindle speed of a ring spinning frame on the structure of yarn (i.e., its surface regularity and hairiness), its strength and the surface pilling of fabric made from such yarn with a view to optimizing the spindle speed. For this, yarns with counts of 20, 25, and 30 tex were produced at six different spindle speeds ranging from 11,000 to 21,000 rpm with an interval of 2,000 rpm. All other parameters were kept constant, including the draft for a particular count, the type and weight of the traveler, and the diameter of the ring. The results obtained revealed that as the spindle speed was increased to 17,000 rpm, the yarn structure became more regular and less hairy, thereby becoming stronger. Beyond 17,000 rpm, however, both the regularity and strength decreased, with the hairiness continuing to increase with increasing spindle speed. Consequently, the surface pilling of the fabric was found to be optimized when made from yarns produced at a spindle speed of 17,000 rpm.
Poly(trimethylene terephthalate)/Cellulose 교편물의 전처리 및 염색에 관한 연구
정성훈,차용호,이권선,오태환,Jeong, Sung-Hoon,Cha, Yong-Ho,Lee, Kwon-Sun,Oh, Tae-Hwan 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.5
The effect of mercerizing, presetting and dyeing of single jersey poly(trimethylene terephthalate) (PTT)/cellulose knitted fabrics were carried out. Pre-treating, dyeing, and finishing conditions were optimized to make uniform PTT/Cellulose knitted fabrics. The optimum conditions of the PTT/Cellulose knitted fabrics for mercerization were 22.5 wt% NaOH, $20^{\circ}C$ and 23 m/min of tenter speed. A cold-pad-batch (CPB) dyeing method could minimize process problems of high tension and rubbing in comparison with an ordinary exhaust dyeing method. Fastness was the best when the fabric was dyed at temperature of $105^{\circ}C$ and for 40 min. We resolved a tailing problem of the CPB process by controlling tenter speed and temperature.
정성훈,홍철재,김시환,송석규,Jeong, Sung Hoon,Hong, Cheol Jae,Kim, Si Hwan,Song, Suk Kyu 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.10
Image analysis method was applied to evaluate the evenness of various nonwoven fabrics. Binder-bonded nonwoven fabrics were used for this research. Images of nonwoven fabrics were scanned and stored into 256 gray scale system. At first, the effects of scanning condition on evaluating the evenness of areal density ($g/m^2$) of nonwoven fabrics were investigated. A coefficient of variation of gray values was used as an evaluation factor. In previous evaluation, the variation means the variance of weight in unit area. In this study, however, it means the variances of gray values obtained from the pixels on the fabric images. This research verified that the coefficient of variation of gray values was proper factor to evaluate the evenness of areal density of nonwoven fabrics.
동측 반맹을 호소하는 후두엽-두정엽 뇌출혈 환자에 대한 복합 한의치험 1례
정성훈,배인후,김근영,조기호,문상관,권승원,이한결,정우상,Seong Hoon, Jeong,In Hu, Bae,Geun Young, Kim,Ki-Ho, Cho,Sang-Kwan, Moon,Seungwon, Kwon,Han-Kyul, Lee,Woo-Sang, Jung 대한중풍순환신경학회 2022 대한중풍.순환신경학회지 Vol.23 No.1
■Background Overall prevalence of visual field loss after stroke was estimated at 31%, ranged from 5.5- 57%. Among them, homonymous hemianopia is the most common symptom of post-stroke visual field loss and leads to a decrease in the quality of life and therapeutic effect. However, standard treatment has not been established. ■Case report A 48-year-old male with right side homonymous hemianopia by a left occipital-parietal lobe hemorrhage was treated with Qu-Ji-Du-Huang-Wan, acupuncture and electroacupuncture for 20 days. We used confrontation visual field exam, automated perimetry and visual analog scale for evaluating symptoms. Following treatment, confrontation visual field exam and the subjective discomfort was improved. ■Conclusions The present case report suggests that combined Korean medicine treatment might be an effective treatment of post-stroke homonymous hemianopia. A number of follow up studies should be conducted to clarify the effectiveness of treatment.
프레팅 조건하에 있는 증기 발생기 세관재의 스틱-슬립 영역별 마멸 메커니즘 규명
정성훈(Sung-Hoon Jeong),박치용(Chi-Yong Park),이영제(Young-Ze Lee) 한국트라이볼로지학회 2005 한국윤활학회지(윤활학회지) Vol.21 No.1
Fretting is the oscillatory motion with very small amplitudes, which usually occurs between two solid surfaces in contact. Fretting wear is the removal of material from contacting surfaces through fretting action. Fretting wear of steam generator tubes in nuclear power plant becomes a serious problem in recent years. The materials for the tubes usually are Inconel 690 (I-690) and Inconel 600 (I-600). In this paper, fretting wear tests for I-690 and I-600 were performed under various applied loads in water at room temperature. Results showed that the fretting wear loss of I-690 and I-600 tubes was largely influenced by stick-slip. The fretting wear mechanisms were the abrasive wear in slip regime and the delamination wear in stick regime. Also, I-690 had somewhat better wear resistance than I-600.
정성훈(Sung Hoon Jeong),김광희(Kwang-Hee Kim),육성민(Sung Min Yook),이희범(Heui Bom Lee),도성섭(Sung Sup Do) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this paper, a press-fit machine using a robot with servo press is proposed to change an existing press-fit machine for flexible manufacturing line. The existing machine carries out a process at a station but the new developed machine can conduct two processes and is more flexible by using a Robot because positions where parts are pressed can be freely changed. To develop this machine, centering device is used for correcting centers of the parts. The centering device has a function of locking to prevent the oscillation of the parts during moving. The locking function can prevent the extension of cycle time. Also, frame for supporting tons of repulsive force during pressing-fit is used. The frame is a plate made of steel and contact with the bracket of servo press and transfer the repulsive force to base plate fixed at floor. As a test result, the quality of press fit with bearing race and dowel pin is very good. The flexible press fit machine can be applied to parts such as plug, steel ball in engine assembly line..
인코넬 690과 600의 스틱-슬립에 따른 마멸 메커니즘 규명
정성훈(Sung-Hoon Jeong),이병종(Byoung-Jong Lee),박용창(Yong-Chang Park),이영제(Young-Ze Lee) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.38 No.-
Fretting is the small-amplitude oscillatory motion between two solid surfaces in contact. Fretting wear is the removal of material from contacting surfaces through fretting action. Fretting wear of steam generator tube in nuclear power plant is a serious topic in recent years. In this paper fretting wear tests were performed in water at room temperature. Fretting tests were done using Inconel 690 and 600 tubes under various applied loads. From the results of fretting wear tests, we get the fretting wear mechanism for Inconel 690 and 600 tubes due to stick-slip. The wear of tube material can be predicted by obtaining wear coefficient using the work rate model. This paper is useful to evaluate the wear characteristics of Inconel 690 and 600 for nuclear steam generator tubes.
프레팅 조건 하에서 스틱-슬립 현상이 마찰력에 미치는 영향
정성훈(Sung-Hoon Jeong),용석주(Suk-Ju Yong),이영제(Young-Ze Lee) 한국트라이볼로지학회 2005 한국윤활학회지(윤활학회지) Vol.21 No.1
Friction and wear characteristics between two steel surfaces under fretting condition are investigated experimentally. The fretting damage caused by low-amplitude oscillatory sliding can be classified into three regimes of gross-slip, mixed-slip and partial-slip due to stick-slip phenomenon. One of the most important characteristics of fretting wear is the transition from gross-slip to mixed-slip. This study was focused on getting the degree of stick-slip out of the friction transition under fretting condition. Fretting wear is divided into three conditions of gross-slip/mixed-slip/partial-slip. The criteria for the division are friction and displacement amplitude, wear scar morphology and dissipated energy. In this test, friction force and displacement were measured for detecting the transition from mixed-slip to gross-slip and qualitatively predicting the degree of the wear.