체인형 합성고무탄성재의 탄성력 감쇄

허창혁,성재현,권오원,경희문 대한치과교정학회 2003 대한치과교정학회지 Vol.33 No.5

본 연구는 체인형 합성고무탄성재의 시간에 따른 탄성력 감쇄의 양상을 평가하여, 이들 재료의 임상적용시 적절한 교정력의 적용을 위해 참고가 될 만한 기준을 구해보려는 목적으로 시행되었다. 공간폐쇄시 사용되는 체인형 합성고무탄성재의 탄성감쇄정도를 알아보기 위하여, 임상에 널리 사용되는 두가지의 체인형 합성고무탄성재를 구강내 상태와 유사한 조건하에서 4주간 신장시켜 관찰한 결과 다음과 같이 요약할 수 있었다. 1. 시간에 따른 탄성력 감쇄양상은 전형적인 log함수의 형태를 보이며, 4주후 잔존탄성력은 원래의 41.2~64.6 %이며 제품에 따라 차이가 있었다. 2. 신장후 초기 10분동안 탄성력의 급격한 감소를 보여서, 초기힘의 20~25 %를 상실하였으며, 이후 감소량이 줄어들어 1주이후부터 4주까지의 평균감소량은 1.5 %정도로 거의 일정한 힘의 크기를 보여주었다. 3. 동일한 재료를 사용하더라도, 탄성재의 신장량이 증가할수록 잔존탄성력이 감소하여 탄성감쇄율이 증가하였다. The purpose of this study was to evaluate the force degradation rate of synthetic elastomeric chains during space closing phase of orthodontic treatment. Two kinds of synthetic elastomeric chains(RMO, 3M) were selected which were commonly used in clinics. All of the samples were extended and tested for 4 weeks under the simulated intraoral condition. The results can be summarized as follows : 1. Time related residual force showed typical logarithm function. Residual force after 4 weeks was 41.2~64.6 % of original force, and difference between two kinds of elastomeric chain existed. 2. Elastic force decreased greatly during first 10 minutes, so 20-25 % of original force disappeared After that, this decreasing tendency was diminished significantly, average rate of elastic force after 1 week to 4 weeks were 1.5 % demonstrating rather constant force. 3. Even though the same brand of elastomeric chiain was used, as extension rate of elastomeric chain increased, force degradation rate increased by decreasing of residual force.

과증식 동공막잔류 눈성인의 치료 : 3예

허준,양성원,양필중,고재웅 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.2

Purpose: Persistent pupillary membrane(PPM) can be classified as four types by means of its morphology. Type 2, which is attached to the lens, is very rare and can cause visual disability. We report 3 cases of type 2 PPM that shows a good visual acuity and cosmetic improvement after removal. Methods: We chose 3 female who showed a poor visual outcome and abnormal shaped pupil since a child. All of 3 case could be examined a hyperplastic persistent pupillary membrane by slit lamp biomicroscopy. Treatment was a surgical removal of PPM, and a surgical removal of PPM and cataract operation in one case of PPM with cataract. Results: All of 3 patient showed a good visual acuity and cosmetic improvement, Conclusion: Surgical management should be also considered to good visual acuity and cosmetic improvement to PPM observed in adult eye.

Aspergillus fumigatus에 의한 요추 척추염 1예

허상택,정숙인,김연숙,오원석,조황래,김성민,백경란,송재훈,이남용 대한감염학회 2001 감염 Vol.33 No.2

Aspergillus fumigatus is the most common pathogen causing invasive aspergillosis. Although invasive aspergillosis mainly involves lung, brain, and sinus, Aspergillus fumigatus osteomyelitis of the spine has been reported very rarely. We experienced a case of vertebral Aspergillus osteomyelitis and report it with a review. A 70-year-old women was admitted due to progressive lower back pain, which had begun 1 month before admission. Although she had diabetes and hypertension, no other underlying disease or immune dysfunction was fecund. MRI of spine showed severely destroyeded lumbar spines. Debridement and bone graft was done for correction of unstable spine, and Aspergillus fumigatus wsa grown from surgical specimen. Amphotericin B was given up to total 2 g, and was switched to oral itraconazole maintenance therapy. She is well until now, 120 days after operation. On the other hand, anthracofibrosis due to Mycobac-Terium tuberculosis was found through bronchoscopic study, which was done because of atelectasis in left lower lobe of lung. Therefore she was treated with anti-tuberculous agents also. (Korean J Infect Dis 33: 153∼156, 2001)

다이아몬드휠을 사용한 WC-Co재의 고능률적 평면 연삭 가공에 관한 연구

김원일,허성중,강재훈,이재경 慶南大學校 附設 工業技術硏究所 1992 硏究論文集 Vol.10 No.-

WC-Co재는 금형 제작용으로 근래 그 사용이 급증하고 있다. 본 논문은 WC-Co재의 고능률 최적 연삭조건을 정립하기 위하여 연삭저항과 연삭비를 중심으로 실험적 연구를 행한 결과 다음과 같은 결론을 얻을 수 있었다. 1)WC-Co재의 가공에 대한 연삭저항은 연삭 깊이가 증가하고 다이야 몬드 연삭 숫돌의 주속도가 느릴수록, 공작물 연삭 속도가 감소할 수록 증가하였다. 2)WC-Co재의 경우, 연삭비는 테이블 이송 속도등의 증가와 더불어 감소함을 나타내었다. Recently, the making of WC-Co materials which are used for metallic mould is growing very rapidly. This investigation examines the grinding force and grinding ratio caused by experimental machining of WC-Co for research high efficiently optimal grinding condition. From the result of experiments obtained hear are summarized as follows and so forth. 1) For working WC-Co materials, the grinding force increases according to increase of depth of cut, decrease of surface velocity of diamond abrasive wheel and increase of surface velocity of work. 2) In case of WC-Co materials, grinding ratio is decrease according to increase of table feed rate et, al.

한국체육대학교 학생의 대학생활 의식조사

이재원,장경원,허재홍 한국체육대학교 학생생활연구소 2000 學生生活硏究 Vol.- No.6

고품위 연삭 가공기법을 이용한 알루미나 세라믹스 부품의 강도향상에 관한 연구

김원일,강재훈,이재경,허성중 경남대학교 신소재연구소 1992 論文集 Vol.2 No.-

초지립 연삭 공구인 다이아몬드 휠을 사용하여 엔지니어링 세라믹스를 제거가공함에 있어 공구의 마멸 및 가공면 상의 가공 결함 등에 의한 강도 저하 현상 등이 야기되어지고 있다. 한편, 최적 절인 형성을 위한 가공 공정상의 빈번한 재드레싱 시간 등의 소요는 생산성 향상의 측면에 있어 장애가 되고 있다. 연삭 가공중의 연속 드레싱 기구를 고려해 봄으로써 계속적인 다이아몬드 지립의 양호한 절인 상태를 유지하며 고능률적으로 제거 가공을 추진하고, 절인 마멸에 의한 가공 결함 들을 극소화시키는 효과를 얻고자 실험적으로 본 연구를 수행하였다. 굽힘 강도 시편을 가공 제작하여 기계적 특성치의 변화를 구해봄으로써 이에 대한 재고찰을 해보았으며, 고품위 연삭 기법에 의한 우수한 결과치들을 얻을 수 있었다. Engineering ceramics have some excellent properies as the material for the mechanical components. It is, however, very difficult to grind ceramics with high efficiency because of their high strength, hardness and brittleness. In this paper experiments are carried out to obtain the effect of In-process dressing to grind the engineering ceramies with high efficency. To save running time for dressing process and obtain restraint effect of diamond grain wear, In-process dressing system using WA stick type honing stone is proposed. Representative engineering ceramics, A1₂O₃, are ground with diamond wheel. Also bending strength test is carried out to check upward tendency of mecahnical properties as the result of machining defact restraint through the grinding machining method using "In- process dressing" process. Some results obtained in this study provide useful information to attain the high efficiency grinding and the high mechanical properties of engineering ceramics.

자가 면역성 간염에서 자가항체의 발현 양상과 스테로이드 치료의 효과

박기오,채경훈,허원석,강윤세,정재훈,김연수,문희석,이엄석,김선문,이병석,김남재,이헌영 충남대학교 의과대학 의학연구소 2003 충남의대잡지 Vol.30 No.1

목적 : 최근 8년간 본원에서 경험한 자기면역성 간염의 혈액학적 특징과 스테로이드의 치료효과를 알아보고자 본 연구를 시행하였다. 방법 : 1996년 이후부터 2002년까지 충남대학교 병원에서 1999년 International Autoimmune Hepatitis Group(LAHG)에서 제시한 수정 진단 기준안에 의거하여 총 진단점수가 probable 이상에 해당하는 환자들을 대상으로 임상적 특징, 검사실 및 조직 소견과 스테로이드와 azathioprine의 치료 효과를 후향적으로 조사하였다. 결과 : 9예의 환자들은 여성이 78%, 40대가 많았고, 급성 발병이 33.3%, 피로감, 식욕부진 및 황달 등이 나타났으며, 항핵항체가 55.6%에서 그리고 항평활근 항체가 77.8%에서 양성이었고, 동반 질환은 류마치스 관절염이 2예, 특발성 혈소판 감소증 1예, Henoch-Sch nlein 자반증 및 그레브스병이 각각 1예 씩이었다. 7예에 대해서 스테로이드와 azathioprine으로 치료하여 생화학적 임상적 완해가 이루어져서 유효한 치료 결과를 얻었다. 결론 : 자가면역성 간염은 우리 나라에서 원인을 찾을 수 없는 만성 간질환의 경우, 특히 중년여성에서 다른 자가면역성 질환이 동반되었을 때 자가면역성 간염을 의심하여 자가항체 선별검사를 시행해 보아야 할 것으로 생각된다. 향후 다기관 연구를 통하여 좀 더 많은 증례를 모으고 전향적인 연구를 시행하여야 할 필요가 있다. Although autoimmune hepatitis(AIH) is common in western contries, some studties have been reported in Korea. The aim of the study was to analyze the clinical and histological features and expression pattern of the autoantibody and to examine clinical course of AIH in Korea. For 9 patients diagnosed as having AIH in our hospital since 1996, we reviewed medical records and analyzed clinical and laboratory findings retrospectively. They had a probable or definite AIH according to the revised criteria of International AIH group. The mean age was 42.7(21∼68)years and 7(77.8%) were female. Three of them(33.3%) showed acute hepatitis and five of them showed cirrhosis. Fatigue and anorexia were the most frequently complained symptoms(55.6%). Four patients(44.4%) were accompanied with other autoimmune diseases. Antinuclear antibody was detected in 5(55.6%) and anti-smooth muscle antibody was detected in 7(77.8%). Three patients showed focal picemeal necrosis and four showed periportal fibrosis. Among 7 patients who received immunosuppressive therapy, six patients(85.7%) showed initial response. and biochemical and serologic remission were achived in 5(71.4%) and 3(42.8%) patients, AIH seems to be partly responsible for chronic liver disease of unknown etiology in Korea. AIH should be suspected in female patients with unknown chronic liver disease of unknown etiolgy, especially accompanied with other autoimmune disease. The clinical characteristics of AIH may not be quite different from those of Western countries.

경골 분절 골절의 골수강내 금속정을 이용한 수술적 치료

하상호,유재원,이상홍,신동민,표영배,허민 조선대학교 1994 The Medical Journal of Chosun University Vol.19 No.2

The Fracture of the tibia is the most common on fracture of the long bone and has high complication rates due to it's anatomical property. Segmental fractures are characterized by two or more fractures on different levels of the shaft with an intermediate segment. In addition to general characteristics of tibial fracture, segmental fractures are commonly combined with extensive soft tissue injury comminution and displacement with poor blood supply in it's intermediate segment. Recently, closed intramedullary nailing under the image intensifier has been widely used and its good results have been reported. The purpose of this study is to compart the bony union, functional result and complication between Ender nail and interlocking nail which we treated with intramedullary nailing in 20 segmental tibial fractures of 19 patients from 1990 to 1991. Minimum follow up period was 12 months. The results were as follows : 1. The most common type of fractures was Melis type Ⅰ. 2. All fractures were united and average union time was 24.9 weeks. 3. The major complications were delayed union (6 cases) joint stiffness (6 cases), superficial infection (3 cases), and angular deformity (2 cases). The complication rate in Ender nail was higher than Interlocking nail. 4. According to the criteria of functional results by Klemm and Borner. we obtained a 87.5% of excellent and good resulted in Ender nailing group and 91.7% of excellent and good results in Interlocking nail group.

재학생 실태조사

홍순모,장경원,허재홍 한국체육대학교 학생생활연구소 1998 學生生活硏究 Vol.- No.4

우리 대학 특기자의 심리적 경기수행능력 : K 척도와 Pd 척도를 중심으로

박영희,장경원,허재홍 한국체육대학교 학생생활연구소 1999 學生生活硏究 Vol.- No.5