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천공지 유리 피판술을 이용한 소아 사지 연부조직 결손의 재건
김학수,김경철,김성언,Kim, Hak-Soo,Kim, Kyung-Chul,Kim, Seong-Eon 대한미세수술학회 2007 Archives of reconstructive microsurgery Vol.16 No.1
Perforator free flap (PFF) is currently a major reconstructive option for soft tissue reconstruction in adults. Although PFFs have been used commonly, most reconstructive surgeons still hesitate to perform PFFs in children. The main cause of concern is the perceived high failure rate related to the small diameter of children's perforator vessels. We present 8 consecutive cases of successful transfer of thoracodorsal artery (TDA) & anterolateral thigh (ALT) perforator flap in children. Between 2003 and 2005, 8 children(4 to 13 years old) with soft tissue defects of the extremities were reconstructed with TDA & ALT PFFs. All flaps completely survived. There were no problems relating to vascular spasm or occlusion. Range of motion of reconstructed extremities were fully recovered. Among 8 patients, only 1 patient was performed an additional flap thinning procedure. 8 cases of TDA & ALT perforator flaps were successfully transferred in children. PFF is an excellent option in reconstruction of children as well as in adults because of its thinness, long pedicle length, least donor site morbidity and acceptable donor site scar.
김학수,김초롱,Kim, Hak Soo,Kim, Cho-Rong Korean Radioactive Waste Society 2018 방사성폐기물학회지 Vol.16 No.3
The Kori-1 Nuclear Power Plant (NPP), WH 2-Loop Pressurized Water Reactor (PWR) operated for approximately 40 years in Korea, was permanently ceased on June 18, 2017. To reduce worker exposure to radiation by reducing the dose rate in the system before starting main decommissioning activities, the permanently ceased Kori-1 NPP will be subjected to full system decontamination. Generally, the range of system decontamination includes Reactor Pressure Vessels (RPV), Pressurizer (PZR), Steam Generators (SG), Chemical & Volume Control System (CVCS), Residual Heat Removal System (RHRS), and Reactor Coolant System (RCS) piping. In order to decontaminate these systems and equipment in an effective manner, it is necessary to evaluate the influence of the flow characteristics in the RCS during the decontamination period. There are various methods of providing circulating flow rate to the system decontamination. In this paper, the flow characteristics in Kori-1 NPP reactor coolant according to RHR pump operation were evaluated. The evaluation results showed that system decontamination using an RHR pump was not effective at decontamination due first to impurities deposited in piping and equipment, and second to the extreme flow unbalance in the RCS caused deposition of impurities.
황화 CoMo / γ- Al2O3 촉매상에서 수첨탈질반응과 수첨탈산소 반응에 상호작용
김학수,박해경,김경림 ( Hak Soo Kim,Hea Kyung Park,Kyung Lim Kim ) 한국공업화학회 1991 공업화학 Vol.2 No.2
황화 CoMo/γ-Al_2O_3 촉매를 사용하여 473-723 K의 온도와 10∼l5×10^5 Pa의 압력 그리고 접촉시간 0.0125-0.03 g-cat hr/ml-feed 범위에서 pyridine 의 수첨탈질반응과 m-cresol의 수첨탈산소 반응의 상호작용 및 그 속도론에 관하여 연구하였다. Pyridine의 수첨탈질반응과 m-cresol의 수첨탈산소반응은 서로 상호반응을 저지 억제하였으며, pyridine에 의한 m-cresol의 수첨탈산소반응의 억제효과는 m-cresol에 의한 pyridine의 수첨탈질반응의 억제효과보다 더 컸으나 반응성은 m-cresol이 더 높았다. Pyridine의 수첨탈질반응 속도식 및 m-cresol의 수첨탈산소반응 속도식을 LHHW 모델을 이용하여 구한 결과 γ_(HDN) =k_(HDN)·K_PC_P/(1+K_CC_C+K_PC_P) , γ_(HDO) =k_(HDO)·K_CC_C/(1+K_CC_C+K_PC_P) 였다. 각 온도에서 반응속도 상수 및 흡착평형상수를 구하여 Arrhenius plot과 Van`t Hoff plot을 행하여 구한 활성화 에너지값은 pyridine과 m-cresol이 각각 16.21Kcal/mole,13.83Kcayl/mole이었고, 흡착열은 각각 -6.458Kcal/mole, -5.045Kcal/mole이었다. Interactions between pyridine hydrodenitrogenation (HDN) and m-cresol hydrodeoxygenation (HDO), and the kinetic analysis were studied over sulfided CoMo/γ-Al_2O_3 catalyst at the range of temperatures between 473 K and 723 K, the total pressures between lO×10^5 Pa and 50×10^5 Pa, and the contact times between 0.0125 g-cat. hr/ml-feed and 0.03g-cat. hr/ml-feed. HDN of pyridine and HDO of m-cresol were inhibited by each other and the inhibition effect of HDO by pyridine is higher than that of HDN by m-cresol. But reactivity of m-cresol is higher than that of pyridine. The rate equations of pyridine and m-cresol were given to be γ_(HDN) =k_(HDN)·K_PC_P/(1+K_CC_C+K_PC_P) and γ_(HDO) =k_(HDO)·K_CC_C/(1+K_CC_C+K_PC_P) in terms of Langmuir-Hinshellwood-Hougen-Watson model. At each temperature, reaction rate constants and adsorption equilibrium constants were determined and the activation energies of pyridine HDN and m-cresol HDO are 16.21 and 13.83 ㎉/mol, respectively and the heat of adsorptions are -6.458 and -5.045 ㎉/mole, respectively.
전자전달증대기를 이용한 고효율 태양전지 시스템에서 전자전달증대기 입력 교류 전압 변화에 따른 태양전지 효율 향상에 대한 연구
김학수,유영기,이혁,윤소영,Kim, Hak Soo,Ryu, Young Kee,Lee, Hyuk,Yun, So Young 한국진공학회 2013 Applied Science and Convergence Technology Vol.22 No.3
In this paper, we would like to introduce Electron Relay Enhancer (ERE), a supplementary device, which improves commercial solar cell efficiency minimizing electron-hole recombination of solar cell. The ERE in this study is mainly composed of two capacitors which are connected to AC power source and bridge diode system which controls electron flow direction. Two capacitors repeat collecting electrons from solar cell and pumping the collected electrons to load resistance or inverter through the bridge diode system. While one positively charged capacitor collect electrons, the other negatively charged one pumps electrons. A positively charged capacitor pulls the more exited electrons from the solar cell, before the exited electrons recombine the holes in solar cell. That is why the ERE system enhances solar cell efficiency. As a result, the measured power increase of the solar cell with the ERE is varied from 5.9 W to 25.6 W in each experimental condition. Maximal increase rate of the solar cell power with ERE is 30.8% of solar cell power without ERE. 본 연구에서는 기존의 상업용 태양전지에서 전자-정공 재결합을 최소화하여 태양전지의 효율을 향상시키는 부가장치인 전자전달증대기(Electron Relay Enhancer: ERE)를 소개한다. 전자전달증대기는 교류 전력 공급 장치와 연결된 두 개의 캐패시터와 전자의 흐름 방향을 제어하는 브릿지 다이오드 시스템으로 구성되어 있다. 두 개의 캐패시터는 브릿지 다이오드 시스템을 통하여 태양전지로부터 전자를 포집하고 포집된 전자를 로드저항이나 인버터쪽으로 펌핑하는 것을 반복한다. 양으로 대전된 한 개의 캐패시터가 전자를 포집하는 동안 음으로 대전된 다른 캐패시터는 전자를 펌핑한다. 태양전지에서 여기된 전자가 정공에 재결합되기 전에 양으로 대전된 캐패시터는 태양전지로부터 더 많은 여기된 전자를 끌어온다. 이러한 까닭에 ERE 시스템은 태양전지의 효율을 증대시킨다. 연구결과로 ERE 활성 시 태양전지의 증가된 전력은 각각의 실험조건에서 5.9 W에서 25.6 W사이였고, 가장 높은 태양전지전력증가율은 ERE 비활성 시 태양전지 전력의 30.8%였다.