Thermo-Loop 를 이용한 난방장치의 해석

한상엽,김철주 成均館大學校 科學技術硏究所 1988 論文集 Vol.39 No.1

This study is experimental work to investigate characteristics of natural convection flow for a thermoloop room heating system. Focus was given to understand flow regimes and correlation between thermal loads and mass flow rates of working fluid. Followings are some results obtained i) When thermal load varies from one state to another, circulating flow demonstrates very stable transient phenomena, whithout any fluctuations shown in toroidal themo-loop. ii) Mass flow rate increases in accordance with thermal load, but its valve is so low that Reynolds number is less than 400. So, flow regime might be of mixed type of convection, and secondary flows develope all through the pipe. iii) Creveling's correlation of some nondimentional groupes, obtained for toroidal thermo-loop, is shown to be applicable for thermo-loop room heating system.

修正 增分法을 利用한 의팔보의 幾何學的 非線形解析

김한철,민경주 대구대학교 과학기술연구소 1998 科學技術硏究 Vol.5 No.1

In this study we discuss modified incremental methods for geometrically non-linear analysis for path-following algorithms. For purpose we drive, base on a parametrization of the solution path. A unifed presentation of some popular continuation procedures used an analysis of structural mechanics in introduced. Updated weighting factors are introduced in the constraint eguation in order to get better convergence characteristics in the case when localized deformations occur.

장기간 댄스스포츠가 호흡순환 기능 및 심폐지구력에 미치는 효과

조현철,김준희,한주희 龍仁大學校 體育科學硏究所 1998 體育科學硏究論叢 Vol.8 No.1

The purpose of this study was to evaluate the effects in respire-circulatory function and cadio-pulmonary endurance capacity. Twelve females(trained 6, untrained 6) participated in dancesport program that is 90min/day, 2day/week for 20weeks. The results were obtained as follow : 1. No significant difference was found in heart rate, ventilation and respiration rate among pretest, after 10 weeks and 20 weeks of dance program and between trained and untrained group. 2. Significant differenced was found in VCO₂between pretest and 20Weeks later in untrained group. 3. There was significantly increased VO₂max in 20 weeks dance program later compared with pretest and significant difference between groups. 4. There was no significant difference in ventilatory threshold and exercise time was not significant difference among trials and between groups. Conclusively, respiro-circulatory function and cardio-pulmonary endurance capacity were not changed at submaximal stage of excise test but those were significantly increased at maximal of exercise test during 20 weeks. Therefore, it is suggested that long term dancesport exercise program is expected more effective on the repiro-circulation function and cardio-pulmonary endurance capacity.

가막만 패류양식장의 수질 및 저질특성

최철웅,문성용,윤호섭,라성주,한종석,최상덕,이우범 國立 麗水大學校 環境問題硏究所 2002 環境硏究論文集 Vol.5 No.-

This study was performed to characterize the seasonal fluctuation of water quality and sediment environment from April, 2001 to November, 2001 in Gamak bay. Which was a productive area, but recently its fisheries conditional have been deteriorated because of increasing waste-water from municipal area, industry and autochthonous pollution by farm industry. In the survey of seawater quality, DO and COD concentrations were lowest in bottom layer at summer, but DIN and DIP contents were higher than those in surface layer. Eutrophication indices mean that eutrophication area move from south to north entrance via northern-west inner area with seasonal change from summer to autumn. In the survey of sediment environment, ignition loss(IL), chemical oxygen demand(COD), DIN and Dip were in the range of 3.8~15.7%, 10.3~60.6mg/g-dry, 5.053~1.810mg/ℓ and 0.065~0.324mg/ℓ , respectively. COD in sediment were highest at winter and spring. And, they were higher than sediment standard in the south inner area, which mean heavily polluted conditions with organic constituents.

분사법에 의한 탄산칼슘 제조

신보철,한상오,김주호,송지훈,송근호,이광래 강원대학교 석재복합신소재제품연구센터 2001 석재연 논문집 Vol.6 No.-

본 연구는 탄산가스화법에 의한 탄산칼슘 입자 제조 공정에 있어서, 탄산가스로 채워진 반응기에 수산화칼슘 슬러리를 분사하는 방법으로 탄산칼슘 입자를 제조하였다. 수산화 칼슘의 농도(0.25~1.0wt%), 분사압력(0.5kgf /㎠~1.5kgf /㎠) 및 반응기 온도(20℃, 28℃)의 변화에 따른 생성된 탄산칼슘을 관찰하였다. 수산화 칼슘의 농도가 비교적 높으면(0.75wt%, 1.0wt%), 생성물의 pH와 전도도는 높게 나타났다. 분사압력에 의한 탄산칼슘 제조의 변화는 분사압력이 높아질수록(1.5kgf /㎠), pH와 전도도는 높게 측정되었다. 그러나, 수산화 칼슘의 농도와 분사압력의 변화가 탄산칼슘의 입자크기, 형태, 결정구조에 영향을 미치지는 않았다. 반응기의 온도가 28℃에서 생성된 탄산칼슘은 1.0㎛이하의 칼사이트 상 입자가 제조되었으며, 20℃에서 생성된 탄산칼슘은 0.5㎛이하의 칼사이트 상 입자가 제조되었다. 반응기의 온도가 낮아질수록 탄산칼슘 입자의 크기가 작아짐을 알 수 있었다. For the preparation of calcium carbonate particles from aqueous Ca(OH)2 slurry, carbonation reaction of aqueous Ca(OH)2 slurry was carried out by spouting the aqueous slurry of Ca(OH)2 into reactor filled with CO2 gas. The concentration of Ca(OH)2 varies from 0.25wt% to 1.0wt%, nozzle pressure from 0.5kgf /㎠ to 1.5kgf /㎠, and reactor temperature were set at 20℃ and 28℃. With relatively high concentration of 0.75wt% and 1.0wt% of Ca(OH)2, pH and conductivity of product-stream were observed high value. High pH and conductivity were observed at high nozzle pressure of 1.5kgf /㎠. The concentration of Ca(OH)2 and nozzle pressure, however, did not change the particle size and shape of calcium carbonate synthesized by carbonation reaction. The reaction temperature affected particle size. At reactor temperatures of 28℃ and 20℃, the particle sizes were about 1.0㎛ and 0.5㎛, respectively. Crystal structure of calcium calcium carbonate was of calcite. When reactor temperature was lower, the size of calcium carbonate particle was smaller.

졸겔법에 의한 티탄산납 제조 및 유기산 흡착특성

김주호,송지훈,신보철,한상오,송근호,이광래 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B

Generally PbTiO3 if manufactured in a form of thin films which is useful for the application infrared sensors and non-volatile memory devices. Moreover PbTiO3 has a characteristic of adsorption for organic acid as well as electronic property. Organic acid adsorption properties of PbTiO3 powder prepared by sol-gel method was compared with the powder purchased from Aldrich Co. Crystallization and particle size of PbTiO3 are influenced by process variable, such as dilution of sol solution, catalysis, calcination temperature, calcination time, etc. As the size of PbTiO3 power decreased until several nanometers, adsorption of acetic acid and formic acid was increased 1.5-fold and 1.2-fold respectively

의식하 진정법에 관한 보호자의 인식도 및 만족도 조사

최한주,박재홍,김광철,최성철 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.4

본 연구는,보호자가 바라보는 진정법의 모습과 이를 통해 보호자들이 얻고자 하는 것과 원하는 것이 무엇인지를 알고 보호자들의 높은 만족도와 능동적인 협조를 이끌어 내기 위한 목적으로 시도되었다. 2006년 7월부터 9월까지 경희대학교 병원 소아치과에 내원한 신환 보호자 168명과 의식하진정법을 경험한 환자의 보호자 50명을 대상으로 설문조사를 실시하였다. 설문지는 신환 보호자용과 진정법 경험 보호자용으로 제작하여 설문을 실시하였다. 조사결과 다음을 알 수 있었다. 1. 일반적인 의식하진정법에 대한 정보의 제공이 주로 주변 사람들에 의해 제한적이고 수동적으로 이루어 졌으며,비전문 적인 성향임을 알 수 있었고,또한 소아치과 진료영역에서의 의식하진정법에 대한 정보의 제공이 부족함을 알 수 있었다. 2. 신환 보호자와 진정법을 경험한 환자 보호자 모두에서 환아의 공포감 감소에 가장 큰 관심을 가지고 있었다. 3. 행동 개선보다는 환아의 심리적 개선에 있어 보호자가 느끼는 만족감이 크며,따라서 진정법 시 행동 개선의 목적 보다는 환아의 공포감및 불안감감소에 초점을 두어야겠다. 4. 신환 보호자의 경우 진정법의 안정성에 대한 인식이 정립되어 있지 않았고,진정법을 경험한 보호자의 경우 모르겠다는 것과 불안하다는 대답이 대부분을 차지하여 경험을 하였음에도 올바른 안전성에 대한 인식을 하지 못하고 있었다. The aim of this study was to recognize guardians' desire and awareness on sedation. and to guide guardians' satisfaction and cooperation. Followings are the conclusion : 1. Information supply about conscious sedation were restrictive and insufficient. 2. Both first-visit guardians and guardians of sedated patients were interested in decrease of dental fear. 3. Doth first-visit guardians and guardians of sedated patients were satisfied with psychological improvement better than behavior improvement. Therefore. decrease of patients' fear and anxiety was essential. 4. Both first-visit guardians and guardians of sedated patients didn' t recognize accurate safety of conscious sedation.

修正 增分法환을 利用한 Deep Arch의 幾何的 非線形解析

김한철,민경주 대구대학교 과학기술연구소 2000 科學技術硏究 Vol.7 No.1

In this study we discuss modified incremental methods for geometrically non-linear analysis for path-following algorithms. For purpose we drive, base on a parametrization of the solution path. A unifed presentation of some popular continuation procedures used an analysis of structural mechanics in introduced. Updated weighting factors are introduced in the constraint eguation in order to get better convergence characteristics in the case when localized deformations occur.

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.

회분식 반응기에서의 공정변수 변화에 의한 침강성 탄산칼슘 제조

신보철,한상오,김주호,송지훈,송근호,이광래 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B

For the preparation of calcium carbonate particles from aqueous Ca(OH)2 slurry, carbonation reaction of aqueous Ca(OH)2 slurry was carried out by batch method the CO2 into reactor filled with aqueous slurry of Ca(OH)2. The concentration of Ca(OH)2 varies from 1.00 to 7.00wt%, reactor temperature at 20 and 40℃, and reactor pressure from atmospheric pressure to 6.0kgf/cm2. Crystal structure of calcium carbonate was of calcite, the particle size were about 0.05 ∼2.0㎛, and the particle shape was cubic and spindle. When reactor temperature was higher, particle size of calcium carbonate was bigger and particle share was varied, but reaction rate was increased. When reactor pressure was higher, particle size of calcium carbonate was smaller, particle shape was cubic, and reaction ramie was increased.