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치과용(齒科用) 경석고(硬石膏) 의 표면경도(表面硬度) 강화(强化)에 관(關)한 실험적(實驗的) 연구(硏究)
김창회,Kim, Chang-Whe 대한치과보철학회 1969 대한치과보철학회지 Vol.9 No.1
The purpose of this studies is to determine the surface hardness of dental stone and to investigate the methods which increase the surface hardness of dental stone using the dissolved solution of various synthetic resin, the obtained results of hardness value calculated Rockwell Hardness Number by means of Rockwell Hardness Tester. 1) In this experiment, 10% polystyrene dissolved in 100cc amylacetate is excellent solution which provides the surface hardness of dental stone after setting of specimen, and there is no effective way that stone specimen is immersed into polystyrene in amylacetate, polystyrene in benzene and polystyrene in butylacetate above 1 hour. 2) When the stone specimen is immersed into acrylic resin in benzene and melamin resin in amylacetate at least 1 hour to 3 hours, the hardening effect of stone surface is valuable. 3) The stone specimen immersing into urea resin in butylacetate, the surface hardness of the stone specimen decreased within 1 hour, but increased after 3 houre. 4) For the separating medium, the easyfoil is superior to the olive oil in the aspect of improving the hardening effect of the immersed specimen.
김창회,김광택,김형묵,Kim, Chang-Hoe,Kim, Gwang-Taek,Kim, Hyeong-Muk 대한흉부심장혈관외과학회 1990 Journal of Chest Surgery (J Chest Surg) Vol.23 No.2
Adenoid cystic carcinoma is a rare primary tracheal tumor, and this tumor behave slow growth, low grade malignancy with local invasion. Although many patient die within 2 to 3 years of the onset of symptoms without appropriate treatment, adequate therapy should lead to survival of 10 years or more. We had a case of adenoid cystic carcinoma in 47 year old female patient who was treated with resection and end-to-end anastomosis of the invaded trachea. Postoperative course was uneventful and discharged without any complications. Radiotherapy of total 6,600 cGy is scheduled 4 weeks after the resective surgery to prevent recurrence.
김창회,오병주,김승호,Kim, Chang-Hoe,O, Byeong-Ju,Kim, Seung-Ho 대한인간공학회 1999 大韓人間工學會誌 Vol.18 No.3
In this paper, We performed the human body dynamic modelling for the realistic animation based on the dynamical behavior of human body, and designed controller for the effective control of complicate human dynamic model. The human body was simplified as a rigid body which consists of 18 actuated degrees of freedom for the real time computation. Complex human kinematic mechanism was regarded as a composition of 6 serial kinematic chains : left arm, right arm, support leg, free leg, body, and head. Based on the this kinematic analysis, dynamic model of human body was determined using Newton-Euler formulation recursively. The balance controller was designed in order to control the nonlinear dynamics model of human body. The effectiveness of designed controller was examined by the graphical simulation of human walking motion. The simulation results were compared with the model base control results. And it was demonstrated that, the balance controller showed better performance in mimicking the dynamic motion of human walking.
PLD 법으로 증착된 Mg<sub>0.5</sub>Zn<sub>0.5</sub>O 박막의 산소 분압 변화에 따른 구조적 특성
김창회,김홍승,이종훈,박미선,빈민욱,이원재,장낙원,Kim, Chang-Hoi,Kim, Hong-Seung,Lee, Jong-Hoon,Park, Mi-Seon,Pin, Min-Wook,Lee, Won-Jae,Jang, Nak-Won 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.9
In this work, we study on the effects of the oxygen pressure on the structural and crystalline of MgZnO thin films. MgZnO thin films were deposited on p-Si (111) substrates by using pulsed laser deposition. The X-ray diffraction analysis and energy-dispersive X-ray results revealed that as the oxygen pressure increased and Mg content in the MgZnO films decreased. Also Crystal structure was changed from cubic rock salt to hexagonal wurtzite. Alpha step and atomic force microscopy results showed that the thickness of the films are about 100 nm, and it has been found that the MgZnO (002) preferred orientation were deposited with increasing the oxygen pressure. Therefore, the effect of the preferred orientation, the crystallization grew in the form of the columnar; Grain size and RMS of the films were increased with increasing oxygen pressure.
오대산국립공원 6개 지역(광미장, 소금강, 질뫼늪, 상원사, 동피골, 월정사)의 조류상
김창회(Chang-Hoe Kim),강종현(Jong-Hyun Kang) 한국조류학회II 2008 한국조류학회지 Vol.15 No.2
본 조사는 2005년부터 2008년까지 강원도 평창군에 위치한 오대산국립공원 내의 6개 격자(광미장, 소금강, 질뫼늪, 상원사, 동피골, 월정사)를 대상으로 실시되었다. 4년간 이 지역에서 관찰된 조류의 종수는 총 94종이었다. 지역별로 볼 때 광미장 지역이 44종, 소금강 지역이 38종, 질뫼늪 지역이 62종, 상원사 지역이 40종, 동피골 지역이 36종이었다. 6개의 조사지역에서 조류 종수의 변동은 자연적·인위적인 요인에 의해 영향을 받는 것으로 판단된다. This study was conducted during 2005 - 2008 in six areas (Gwangmijang, Sogeumgang, Jilmeneup, Sangwonsa, Dongpigol and Woljeongsa) at Mt. Odae National Park, Pyeongchang-gun, Gangwon-do. The number of avian species of six areas is 94. The number of species in Gwangmijang, Sogeumgang, Jilmeneup, Sangwonsa, Dongpigol and Woljeongsa is 44, 38, 62, 40, 36 and 47, respectively. In six study areas, the fluctuation in the number of avian species probably is influenced by the natural and artificial factors.
김창회(Changhoi Kim),정승호(Seungho Jeong),정태원(Taewon Jeong) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
The Live-line work, which is the method of the power line maintenance without the power cut, is widely carried out in the domestic maintenance of distributed power line. The position of robot should be measured and modified the planed path in order to preform the preprogramed tasks for the live-line work. In this paper, we propose the robot position measurement method using a single image of camera which is attached at the base of robot.