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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.
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.
충돌 노즐 출구 직경에 따른 용해 탱크 내부의 유체 유동에 관한 연구
유성훈(Seong Hun Yu),박상희(Sang Hee Park),강우진(Woo Jin Kang),신호범(Ho Beom Shin) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.10
본 논문의 목적은 충돌 노즐이 부착된 용해 탱크 내부의 유체 유동을 수치해석 및 실험적으로 연구하는 것이다. 용해 탱크 내부의 압력 및 와도분포는 수치해석으로, 공기의 자가흡입 및 용해 탱크 내부의 압력 측정은 실험적으로 수행하였다. 본 연구에서는 물의 유량을 10, 15, 20LPM으로, 충돌 노즐의 출구 직경을 4, 4.5, 5, 5.5, 6mm로 변화시켰다. 용해 탱크 내부의 압력에 대한 수치해석 및 실험의 결과는 잘 일치하는 경향을 보였다. 용해 탱크 상단부의 와도는 노즐 직경이 작을수록, 유량이 증가할수록 더 강렬하게 나타남을 보였다. 또한, 용해 탱크 내부의 압력은 노즐 직경이 커질수록 감소하였고 유량이 증가할수록 증가하였다. The purpose of this paper is to study numerically and experimentally on the fluid flow in a dissolution tank with a collision nozzle attached. The pressure distribution and vorticity distribution in the dissolution tank were numerically analyzed, and the self-suction of air and the pressure in the dissolution tank were experimentally performed. The outlet diameter of the collision nozzle is changed in a range 4∼6mm, the water flow rate 10∼20LPM. Numerical analysis and experimental results for pressure in the dissolution tank showed good agreement. It was shown that the vorticity at the top of the dissolution tank became more intense as the nozzle diameter decreased and the flow rate increased. Also, the pressure in the tank decreased as the nozzle diameter increased, and increased as the flow rate increased.
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.