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김헌태,권상호,지영근,강맹규 한국경영과학회 2003 한국경영과학회지 Vol.28 No.2
The traveling salesman problem (TSP) is an NP-hard problem. As the number of nodes increases, it takes a lot of time find an optimal solution. Instead of considering all arcs, if we select and consider only some arcs more likely to be included in an optimal solution, we can find efficiently an optimal solution. Arc candidate set is a group of some good arcs. For the Lack of study in the asymmetric TSP, it needs to research arc candidate set for the asymmetric TSP systematically. In this paper, we suggest a regression function determining arc candidate set for the asymmetric TSP. We established the function based on 2100 experiments, and we proved the goodness of fit for the model through various 787 problems. The result showed that the optimal solutions obtained from our arc candidate set are equal to the ones of original problems. We expect that this function would be useful to reduce the complexity of TSP.
생쥐 위장관의 Interstitial cells of Cajal(ICC)에 대한 면역조직화학적 연구
김영철,차경훈,신무경,임건한,김주영,안병수,김장만,양경철,박도영,오재욱,장인엽 조선대학교 2003 The Medical Journal of Chosun University Vol.28 No.1
Background and Objectives : Interstitial cells of Cajal(ICC) are the pacemakers in gastrointestinal tract that modulates gastrointestinal motiliey and these cells also transmit neural input from enteric nerves to smooth muscles. Recent work on tissues from patients with motility disorders that suggest that loss or defect in ICC could be related to pathophysiology in human and animal models. Immunolabelling of ICC in intestinal wall is recently developed by using specific marker, anti-c-kit antibody. Immunohistochemistry was done for ICC network in attempt to provide a morphological basis for the mechanism regulating gastrointestinal motility Methods : Cryosection was done, and whole-mount preparations of mouse stomach, gastrointestinal tract were immunolabelled using the anti-c-Kit. Immunolabelled ICC networks were observed under a confocal laser scanning microscopy. Results : According to three dimensional reconstruction study, we found that the c-Kit-positive celluar networks were widely distributed in the gastrointestinal muscle (1) circular muscle layer(IC-IM), (2) myenteric plexus(IC-MY), (3) deep muscular plexus(IC-DMP) in ileum, (4) submucosal plexus(IC-SMP) and longitudinal muscle layer(IC-LM) in colon. Conclusion : The characteristic profiles of ICC celluar networks provide a morphological basis upon the mechanism regulating gastrointestinal motility. Additional studies for the enteric nerves-ICC interaction are need to evaluate the detailed roles of Icc in gastrointestinal tract.
산소의 첨가가 박막 백금측온저항체의 온도저항계수에 미치는 영향
설철규,김영진,장경훈,이건환,이정희 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
A thin film Pt-RTD(resistance temperature device) was fabricated by using DC magnetron sputtering and laser patterning. A study was fulfilled to adjust the TCR(temperature coefficient of resistance) to 3850 ppm/℃ which is IEC751 standard and the influence of oxygen addition(0 ~ 20 %) on TCR was measured. The resistance of Pt-RTD was set to 1000 Q at 0 ℃ using laser patterning and trimming. The analyses of XRD and AES were used to characterise the platinum thin film. The TCR of Pt-RTD was measured by a high precision oil bath. When the addition of oxygen flow rate was 1 %, TCR was 3850 ppm/℃.
곽이구,한재호,김홍건,김재열,김훈조 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
This paper wishes to develop system that measure an external diameter of optical-ferrule and roundness that is optical connection parts that is necessary in optical communication net construction that increase rapidly present automatically and plan productivity elevation and personnel expense curtailment. There is LC, PC, MU, and so on various form in the case of optical-ferrule and Recently, ferrule that have special form is appearing. Hereupon, can bring cost reduction by productivity elevation, measurement quality elevation, number of persons attrition and parts loss amount decrease etc. by computerizing measurement work of examination process that depended on existing manual processing by developing exterior diameter of LC ferrule and roundness' measurement system. Also, use of LD and PD ferrule by country and universal FTTH business is increasing, and LC optical ferrule that is necessary to laser packaging of inside depends on income. Therefore, productivity improvement of LC ferrule can contribute in could do to maximize income substitution effect country industry development. But, manual processing dependence of examination process that it selects LC ferrule manufacturing process defective goods that productivity does not increase because is high productivity elevation decrease bring. Therefore, productivity elevation of LC ferrule wishes to solve productivity decrease by existent manual processing computerizing external diameter and roundness measurement examination process.
工業敎育大學의 實驗實習施設 共同活用 및 運營에 關한 硏究
尹錫天,牟相榮,權五憲,千炳善,周赫鍾,李永臣,金健中,羅聲雄,洪錫雨,吳德成,盧泰天 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(A)
The College of Engineering was specialized to have a sole function for supplying technical high school teachers in 1977 and referred to as the College of Industrial Education according to the Government's policy. The economic impact mainly due to the oil-crises caused a severe problem to this college, namely discrepancy of supply to demand scale. Accordingly the number of student enrollment was to be fluctuated from 479 in 1979 through 800 in 1979 and 900 in 1980 to 430 in 1981. And the engineering departments have been attached to this Engineering Education College since 1981. These circumstanses met singnificant inefficiency in facility operation. This program aims at providing an overall relocation of the college facilities and preparing the practical system to make the joint-operation possible taking into account circulation, academic stream, budget, maintenance, etc. However this study could not get optimal spacing but some trade-off, considering the current situation.