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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.
Two-Stage Peroral Endoscopic Myotomy for Sigmoid-Type Achalasia
김학수,Hee Kyung Kim,고원진 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.2
Peroral endoscopic myotomy (POEM) has been recently considered as the first treatment option for achalasia. The standard POEMprocedures are often successful in most patients, but sometimes technical challenges are encountered. We report a new technique thatis divided between two tunneling sites in the esophagus for sigmoid-type achalasia. A 40-year-old male patient with dysphagia for 10years was diagnosed with a sigmoid-shaped esophagus at our hospital. We devised a two-stage myotomy technique to treat sigmoidtypeachalasia. The myotomy was first performed in the upper part of the greater flexion area and then in the lower part of the flexion. We termed this method “two-stage POEM”, which was successfully performed without any complications. This new POEM methodcan also be used to improve symptoms in patients with achalasia who have a structural deformity that may result in a high change oftreatment failure.
김학수,김욱중,조문상,이종엽,Kim, Hak-Su,Kim, Uk-Jung,Jo, Mun-Sang,Lee, Jong-Yeop 대한심미치과학회 2002 Journal of the Korean Academy of Esthetic Dentistr Vol.11 No.2
As patients have concerned the esthetics of dental restorations, the porcelain fused to metal restorations have gain their popularity due to their strength and esthetic appearance for many years. However, metal collar in subgingival level of porcelain fused to metal restoration often causes black shadows. Inadequately positioned metal collar causes plaque depositions, gingival inflammations, black shadows, and discolorations of margin area. Those problems can be avoided by a clear finishing line, well-fabricated provisional restorations with precise margin and fine polishing, collarless porcelain fused to metal restoration, and all ceramic restoration. In this case report, collarless porcelain fused to metal restoration was used to treat cervical discoloration from old restorations.
김학수,Kim, Hak-Su 한국과학기술단체총연합회 1995 과학과 기술 Vol.28 No.5
갈등이 많은 나라, 인삼과 태권도 중심의 나라로 외국인의 눈에 비쳐지고 있는 한국, 중국이 상권을 ,일본이 자본과 기술을 지배하고 있는 동남아에서 한국이 설자리는 어디인가? 스위스가 정밀공학분야로 살아남앗듯이 우리한국은 온 국민을 과학기술에 매진케 하여 모든 국사가 그 기조위에서 이루어지도록 해애 할 것이다.
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.