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Solar cell wafer용 squaring & grinding machine의 진동 억제를 위한 설계 변경
신호범,노승훈,윤현진,길사근,김영조,김건형,한대성 한국반도체디스플레이기술학회 2017 반도체디스플레이기술학회지 Vol.16 No.3
Solar cell industry requires high technologies to stabilize apparatuses for the wafer manufacturing. Vibrations of squaring & grinding machines are one of the most critical factors for causing residual stresses of ingots, which are the main reasons of the breakage in the following processes such as wire sawing, cleaning, and modularity. In this study, the structure of a squaring & grinding machine has been analyzed through experiments and computer simulations to figure out the ways to suppress the vibrations effectively, and further to minimize the breakage of wafers. The result shows that simple design changes of applying a few ribs can improve the stability of the machine.
부정교합의 치료를 위해 동반되는 corticotomy : 문헌고찰 REWIEW ARTICLE
신호범,염창엽,노기성,조세열,김병옥,한경윤 朝鮮大學校 口腔生物學硏究所 1999 Oral Biology Research (Oral Biol Res) Vol.23 No.1
In order to overcome the limit of conventional orthodontic treatment and reduce orthodontic treatment time, corticotomy technique is used to orthodontic treatment. Corticotomy as osteotomy of the cortical bone is useful to obtain faster movement of teeth, since the main resistance to movement is encountered in the cortical layer. The advantage of the corticotomy are many, through leaving the spongiosa intact, prevents injury of the periodonteum, pocket formation, and devitalizing of a single tooth or of a group of teeth. The nutritional function of the bone to e displaced is maintained through the spongiosa, although the bone exposed. It the corticotomy is performed under adequate selection of indication, it can be selected for effective supplemently surgery under orthognathic surgery and conventional orthodontic treatment.
신호범,김병옥,한경윤 朝鮮大學校 口腔生物學硏究所 1999 Oral Biology Research (Oral Biol Res) Vol.23 No.2
In the maxillary anterior region, the labial level of gingival margin in an important parameter in the aspect for esthetics. Crown lengthening procedures generally used to obtain biologic width and applied to resolve esthetic problem. Such esthetic problems are gummy smile - excessive gingival display combined with short clinical crown, gingival asymmetry, and flat gingival contours. Clinical crown lengthening procedure can be performed by gingivectomy, flap operation, and forced eruption. We could obtain favorable esthetic results by chinical crown lengthening using spically positioned flap combined with osteotomy.
비외과적 치주처치의 선행 유무에 따른 치주 판막술 후 임상적 평가
신호범,염창엽,김상목,김병옥,한경윤,Sinn, Ho-Beom,Yun, Chang-Yup,Kim, Sang-Mok,Kim, Byung-Ock,Han, Kyung-Yoon 대한치주과학회 2001 Journal of Periodontal & Implant Science Vol.31 No.1
In the treatment of chronic adult periodontitis, scaling and root planing have been generally performed prior to periodontal flap surgery. The purpose of this study was to evaluate the clinical significance of nonsurgical periodontal therapy prior to periodontal flap surgery in patients with chronic adult periodontitis. Fifty six molars showing bilateral bony defects and 4-6mm periodontal pocket in twelve patients with chronic adult periodontitis were selected. By randomized split-mouth design, in one side, flap operation was performed 4 weeks after scaling and root planing, in the other group, flap operation was only performed without scaling and root planing. Probing pocket depth, gingival recession, clinical attachment level, gingival index, plaque index, and tooth mobility were measured at baseline, before flap operation and post-operation
PSCAD/EMTDC와 FEA를 이용한 케이블 배열 방법에 따른 전류 불균형률의 비교
신호전(Ho-Jeon Shin),김지호(Ji-Ho Kim),강갑석(Gab-Suk Kang),김재철(Jae-Chul Kim),이향범(Hyang-Beom Lee) 대한전기학회 2013 전기학회논문지 P Vol.62 No.2
In this study, samples from the site where there occurred unbalanced current when cable routing were analyzed, and the simulation program for electric power system analysis, PSCAD/EMTDC, was used to calculate the current unbalance on cable routing. Based on electromagnetic finite element analysis(FEA), electromagnetic parameters enabled the interlocking with COMSOL for the calculation of allowable current ampacity and magnetic filed distribution. This then led to modeling unbalanced current between common modes using the unbalanced current analysis program, thereby comparing and discussing the results from both. The analyzed model is a common mode 2 parallel circuit, which is a basic model for cable routing, and by arranging cables in various ways, the arrangement with the least current unbalance was suggested, which would, in the future, prevent earth faults and extend life for the whole cable.
가공정도 향상을 위한 Pipe Cutting Machine의 설계 개선
길사근,노승훈,신호범,김영조,김동욱,노호철 한국반도체디스플레이기술학회 2018 반도체디스플레이기술학회지 Vol.17 No.3
The modern industry requires the precision machining as well as the high productivity. The machine tool structure should be evaluated in aspects such as durability, static stability, precision rate and the dynamic stability which is one of the most critical characteristics in determining the magnitude of vibrations. In this study, the dynamic properties of a pipe cutting machine were investigated to analyze the structural vibrations of the machine, and further to improve the structural stability and precision machining. Frequency response test and computer simulation have been utilized for the analysis and the design alterations. And the result shows that proposed design alterations can reduce the vibrations of the machine substantially.
김영조(Young Jo Kim),노승훈(Seung Hoon Ro),신호범(Ho Beom Shin),신윤호(Yun Ho Shin),정근섭(Keun Sup Jung),남규동(Kyu Dong Nam) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.3
In modern industries, in whichwhere high productivity is one of the most important concerns, machine tools are facing difficulties to satisfy the high high-speed operation, while and at the same time achieve the precision machining. Generally, the vibrations of the structure increase proportionally to the square of the operating speed so that the precision machining is severely damaged with increased speed. which is a must for the high productivity. Therefore, the suppression of the structural vibrations of the machine tools is the a major concern in the machine tool industry in order to achieve the high productivity and the precision machining simultaneously. In this study, the dynamic properties of a machining center structure were analyzed through the experiment and the computer simulations, and furthermore the results from those were compared to confirm the validity of the simulation model. The design alterations were deduced from the analysis and applied to the simulation model to investigate the effects of those alterations to suppress the vibrations of the machine. The result shows that the relatively simple design alterations, without redesigning the main structure of the machine, can suppress the vibrations effectively.