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Al<sup>3+</sup>와 Y<sup>3+</sup> 동시치환 SnO<sub>2</sub> 투명전극 박막의 전기적 특성
김근우,서용준,성창훈,박근영,조호제,허시내,구본흔,Kim, Geun-Woo,Seo, Yong-Jun,Sung, Chang-Hoon,Park, Keun-Young,Cho, Ho-Je,Heo, Si-Nae,Koo, Bon-Heun 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.10
Transparent conducting oxides (TCOs) have wide range of application areas in transparent electrode for display devices, Transparent coating for solar energy heat mirrors, and electromagnetic wave shield. $SnO_2$ is intrinsically an n-type semiconductor due to oxygen deficiencies and has a high energy-band gap more than 3.5 eV. It is known as a transparent conducting oxide because of its low resistivity of $10^{-3}{\Omega}{\cdot}cm$ and high transmittance over 90% in visible region. In this study, co-doping effects of Al and Y on the properties of $SnO_2$ were investigated. The addition of Y in $SnO_2$ was tried to create oxygen vacancies that increase the diffusivity of oxygen ions for the densification of $SnO_2$. The addition of Al was expected to increase the electron concentration. Once, we observed solubility limit of $SnO_2$ single-doped with Al and Y. $\{(x/2)Al_2O_3+(x/2)Y_2O_3\}-SnO_2$ was used for the source of Al and Y to prevent the evaporation of $Al_2O_3$ and for the charge compensation. And we observed the valence changes of aluminium oxide because generally reported of valence changes of aluminium oxide in Tin - Aluminium binary system. The electrical properties, solubility limit, densification and microstructure of $SnO_2$ co-doped with Al and Y will be discussed.
전위된 관절 내 종골 골절의 Ollier 접근법을 이용한 치료
김근우,조상기,이동연,Kim, Keun-Woo,Cho, Sang-Gi,Lee, Dong-Yeon 대한족부족관절학회 2008 대한족부족관절학회지 Vol.12 No.2
Purpose: We evaluated the clinical results of the intraarticular calcaneal fractures treated using Ollier approach by inexperienced orthopaedic surgeon. Materials and Methods: Between August 2003 and May 2007, Of the total 46 cases, 12 cases (9 patients) of displaced intraarticular calcaneal fracture who underwent open reduction and internal fixation using Ollier approach were evaluated. The means of age was 50.5 years. According to the Sanders classification, there was no type I case and 8 cases of type II, 1 case of type III, and 3 cases of type IV. We evaluated the treatment result by assessing radiologic parameters ($B{\ddot{o}}hler$ angle, Gissane angle, and calcaneal height/width) and clinical outcomes (VAS and AOFAS score). Results: The means of follow-up period was 25.3 months. The means of B.hler angle was improved from $2.4^{\circ}$ to $26.1^{\circ}$. Radiologic and clinical union was achieved in all cases without additional procedures. Excellent result were noted in 2 cases, good in 5 cases, fair in 4 cases, and poor in 1 case. We experienced 2 cases of minor complications; 1 case of mild wound infection and 1 case of hypoesthesia on foot dorsum. Radiologic findings of subtalar arthritis were present in 2 cases. Conclusion: Ollier approach seems to be helpful to inexperienced orthopaedic surgeons for the treatment of intraarticular calcaneal fractures in that it enables them to achieve considerable clinical outcomes without serious complications.
김근우(Keun Woo Kim),구병수(Byung Su Ku) 대한한방신경정신과학회 1997 동의신경정신과학회지 Vol.8 No.1
This study was done in order to investigate Oriental Medicine`s meaning on stress, the stress is due to animal experiments. Methods: This research was done by animal experiments`s results based on 41 animal experiment treatises carried out by 24 prescriptions about stress control. Each experiments were compared with same conditions, minimizing the experiments differences. The results were analyzed by p-value and Increas e·Decrease percentage of experiments result`s numerical value. Results: 1. Inquire into frequency in use of each stress stimulus and measuring items, the restriction stimulus stress and measuring the content of catecholamines are numerous. 2. Significance of stress stimuluses based on experments`s results is good by restriction stimulus. 3. Oriental Medicine`s meaning for stress is pathological phenomenon of Seven Emotion(七情). Stagnant the Energy(氣鬱), the Fire(火), Dam(痰), Lack of the general Blood thing(血虛), and reaction of an individual body. 4. Inguire into the effects of frequency in use of experiments`s Herb drugs, Herb Drugs of Tonifing the general Blood thing depend on stabilized Mind(補血安神), Circulated the Energy and Digest(理氣消導), Tonifing the general Blood thing(補血), Clearing the Mind(淸心), Removing the Dam(거담) are numerous. 5. From a Sasang Medical point of view, experimental use of Herb Drugs are Soeum-in(少陰人) Herb Drugs are numerous. According to above results, it is considered that Herb Drugs of Tonifing the general Blood thing depend on stabilized Mind(補血安神), Circulated the Energy and Digest(理氣消導), Tonifing the general Blood thing(補血), Clearing the Mind(淸心), Removing the Dam(거담), and Soeum-in(少陰人) Herb Drugs are used to prevent stress and related diseases.
김근우 ( Keun Woo Kim ),남신우 ( Shin Woo Nam ),한계영 ( Kye Young Han ) 대한슬관절학회 2008 대한슬관절학회지 Vol.20 No.1
Purpose: To report the results of Oxford unicompartmental knee arthroplasty after short term follow up. Materials and Methods: Twenty nine knees from 26 patients who had undergone Oxford unicompartmental knee arthroplasty from March 2002 to February 2006 were reviewed. There were 25 females (28 knees) and 1 male (1 knee) and the average age was 65.9 years. The preoperative diagnosis was 22 cases of medial osteoarthritis and 7 cases of osteonecrosis of the medial femoral condyle. We evaluated the intraoperative complications. The clinical evaluation was accomplished by assessing the pre-and postoperative knee society pain and function scores, Lysholm score and HSS score. The radiologic evaluation was accomplished using the weight bearing AP view and lateral films. Results: The postoperative knee society pain and function score, Lysholm score and HSS score were improved compared with the preoperative scores. The tibiofemoral angle was improved from varus 2.8° preoperatively to valgus 6.6°. Three cases of medial tibial condyle fracture occurred and 1 case of overhang of the tibial component were observed. Three cases were revised due to component loosening. Conclusion: Even though a high incidence of complications and loosening were observed, the clinical results of Oxford unicompartmental knee arthroplasty were improved during the short term follow up. We thought that thorough preparations should be done prior to surgery and there is room to improve femoral component design for the stability against rotational torque such as two pegs on the femoral component.