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칼슘길항제와 혐수성 산소 라디칼 제거물질이 백서 피부판 생존에 미치는 영향
양정열,임홍철,이명주,서재홍 조선대학교 1994 The Medical Journal of Chosun University Vol.19 No.2
Regulation of Ca^++ channels across cell menbranes can be dramatically altered by ischemic states, and such agents relates to cytotoxic effect. The genration of free radicals in ischemic tssue is detrimental to survive of that tissue. If intracellular calcium increasement and free radical production can be blocked or scavenged, tissue damage should be minimized. In the concept of above theory, the author studied the effect of nifedipine. α-tocopherol known as a calcium channel blocker and hydrohobic scavenger on the random pattern skin flap survical of white rats . Sprague-Dawley rats(N-60) were divided into four groups of control(no medication) , nifedipine(10㎎/ ㎏ /day, I.M.), α-tocopherol(20㎎/㎏/day, I.M.). nifedipine plus α-tocopherol. All of medications were given for 11days from 4days before flap elevation and contnued for 7days after flap elevation. When flap survival rates were measured. Flap tissue was obsered by gross, light microscooc and electron microscopic levels. The results were obtained as follows. 1. Groups treated with nifedipine. α-tocopherol. nifedipine +α-tocopherol showed significant increase of the area of flap survival compared with that of the control group.(P<0.001 in nifedipine group and α-tocopherol, and P<0.01 in nifedipine plus α-tocopherol group.) 2. The flap survival was best improved in the α-tocopherol group. (P>0.05). 3. Skin including dermis after 3 days of Nifedipine plus α-tocopherol group disclosed marked proliferation and dilatations of vessels in the deeper part. 4. Electron micrograph of endothelial cells after 3 and 5 days of Nifedipine and α-tocopherol groups disclosed intact basement membrane, swelling of endoplasmic reticulum and mitochondria. Following the above results. It is suggested that calcium channel blocker and α-tocopherol seem to play a important role which incerase survival of the skin flap.
양정열,황택성,곽노석,임정훈,최용재 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.9
Hafnium oxide (HfO₂) was very advantageous for substitute material of gate on existing transistor. HfO₂has been widely studied due to high contact with polysilicon and thermal stability and also, it is easily etched by using HF solution. In this study, HfO₂and thermal oxide films were etched by wet etch method using chemical etchant. Etch rate of HfO2 and thermal oxide was linearly increased with increasing concentration of HF and temperature but etch rate of HfO₂was higher than thermal oxide due to H^+, F^-, and HF₂- ions at below 0.5% concentration of HF. And also, etch selectivity was improved by adding Hydrazine as additive. HfO₂는 기존의 트랜지스터에 사용되고 있는 게이트 유전막을 대체할 수 있는 물질이다. HfO₂는 폴리실리콘과 접촉성이 높고 열적 특성이 우수하기 때문에 많은 연구가 진행되고 있으며, 또한 HF 용액으로 쉽게 식각되는 특성이 있다. 본 연구에서는 HfO₂및 thermal oxide 박막을 chemical 식각액을 사용하여 식각하였다. HfO₂및 thermal oxide 박막은 HF 농도 및 온도가 증가함에 따라 선형적으로 증가하는 경향을 나타내었지만, HF의 농도가 0.5% 이하일 때는 H^+, F^-, HF₂- 이온들로 인하여 thermal oxide 박막 대비 HfO₂박막의 식각율은 더 높게 나타내었다. 또한 식각 선택비는 첨가제로써 사용한 하이드라진을 첨가함에 따라 향상되는 특성을 나타내었다.
대전자부 압박궤양을 가지고 있는 하지마비 환자에서 대퇴골 골절부위에 발생한 비정상적 골증식의 치험례
양정열,천지선 대한성형외과학회 2008 Archives of Plastic Surgery Vol.35 No.1
Purpose: Heterotopic ossification in pressure sore patients is reported to rarely develop, but once it occurs, it frequently causes joint stiffness and mobilization restriction. The aim of this article is to report our experience of atypical bone growing at femur neck fracture site with chronic, extensive pressure sore in patient with paraplegia secondary to spinal injury. Methods: A 28-year-old male patient presented with atypical bone growth at femur neck fracture site with pressure sore. He had undergone atypical growth bone removal and separation of united iliac bone and femur, and then pressure sore was covered by advanced rotation flap.Results: The patient mobilized hip joint and rode in a wheelchair. Complications such as dehiscence, infection, hematoma and flap necrosis did not occur.Conclusion: We experienced successful correction of atypical bone growth removal and recovery of pressure sore. We report our experience of atypical bone growth of fracture site and the related literature was reviewed.
이창근,양정열 大韓成形外科學會 1990 Archives of Plastic Surgery Vol.17 No.4
Midline cervical cleft is rare congenital anomaly of the ventral neck. This anomaly is part of a spectrum of midline branchiogenic syndromes resulting from abnormal migration of cells derived from the branchial arches. The lesion may be present at any level in the midline of the neck. The congenital midline cleft is frequently associated with a cord-like thickening that in severe cases caused contracture. We report a case of congenital midline cervical cleft in a 33 year-old-female. There was promounced contracture of the neck. We treated by complete excision of fibrous band in the midline, including the attenuated skin and the closure of skin by large double Z plasty. The cleft was completely corrected, and there was no restricion of full extension of the neck.
류봉수,이명주,양정열 大韓成形外科學會 1997 Archives of Plastic Surgery Vol.24 No.2
Aging process of the forehead in human reflects imbalance of the forehead muscles, forehead ptosis including eyebrow, and winkles of the forehead and glabella. Forehead lifting through bicoronal incision was adopted as an universal method to correct these problems of the aging process. In a view of the aesthetic surgery, however, there are several problems such as large scar. alopecia, and numbers beyond the incision line in the scalp for the correction of the forehead aging stigma. During the part few decades, minimally invasive technology forced many surgical specialities to undergo dramatic changes. In plastic & reconstructive surgery also minimally invasive technology using endoscope gave many advantages. Therefore it has reduced morbidity rates and got greater patient acceptances for the forehead lifting. When we perform endoscopic brow-forehead lift to get a good results in oriental people, 1. it needs a extended periorbital dissection. 2. We have to concern lift in the lateral part of forehead rather than in medial forehead. 3. it needs more aggressive tissue modifications (e. g. myotomies, neurotomy) 4. int needs more strong fixation such as permanent microscrew fixation or cortical bone drill hole technique. We performed 13 cases of the eyebrow-forehead lifting by using endoscope from August 95 to September 96, followed up them from 3 to 12 months and obtained satisfactory result. We would like to report our experience with literature review.