흐름 計算의 數値 積分法에 관한 硏究

조원철,李元煥,송재우 연세대학교 산업기술연구소 1977 논문집 Vol.7 No.1

A simple rapidly converging iterative method of computing gradually varied steady flow profiles in open channels of any shape, prismatic or nonprismatic, is presented. The method is also applicable to spatially varied steady flow. It is not necessary to determine the shape of the expected profile or the type of flow in advance to proceed with the solution. Computations can proceed either upstream or downstream, regardless of the type of flow, once the channel, discharge, and the initial depth of flow are specified. The procedure for hand computation is illustrated by an example and a FORTRAN program is given.

프랙탈 수학을 이용한 소자 표면의 구조 및 전기적 특성

조재철 초당대학교 초고속정보화센터 2001 초고속정보화센터논문집 Vol.2 No.-

전자소자의 전자현미경 사진을 프랙탈 이론을 적용하여 소자의 전기적 특성을 분석하였다. 전자소자 표면의 전자현미경 사진을 이진코드로 변환하여 그린인 형태를 프랙탈 차원으로 처리하였으며 보이드는 프랙탈 프로그램으로 처리하였다. 그래인 밀도와 전기적 특성은 프랙탈 차원에 의존하였다. ZnO 바리스터의 그래인 크기는 Sb2O3의 첨가량에 따라 감소하였으며 Sb2O3 의 첨가에 따라 스피넬 구조가 형성되었고 ZnO 그래인 형성을 억제하였다. Sb2O3첨가께 따른 ZnO의 그래인 크기는 5∼10μm이었다. 프랙탈 차원이 증가할수록 그래인 밀도는 복잡해지며 전기적 특성이 양호해졌다. The structural properties that SEM pholograph of electronic devices surface studied by fractal mathematics program were investigated to verify the relations of electrical characteristics. The SEM photograph of electronic devices surface was changed by binary code and the grain shape was analyzed by fractal dimension. The void of electronic devices surface was found by fractal program. The relation between grain density and electrical properties depend on fractal dimension. The grain size in ZnO varistors surface was decreased by increasing of Sb2O3 addition. the spinel structure was formed by Sb2O3 addition and it was depressed the ZnO grain formation. The grain size of ZnO by Sb2O3 addition were from 5 to 10[μm]. When the fractal dimension was high, the grain shape of electronic devices was complex and the electrical properties was improved.

하악골에 발생된 Low grade 골육종:증례보고

조현이,정종철,김호성,최재욱,성대경,서지훈,김성범,이계혁 大韓顎顔面成形再建外科學會 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.1

Osteosarcoma is a primary malignant tumor arising most often in the long bone, but rare in jaw bone. Especially osteogenic sarcoma of the mandible is a rare tumor, comprising less than 0.5% of all head and neck tumors. Osteosarcoma occurs cheifly in young persons, and presenting very survival rates. Histopathologically this tumor can be classified three types, osteoblastic, fibroblastic, chondroblastic and classified from low grade to high grade by anaplasia or mitosis of the tumor cells. Sometimes, the exact diagnosis of osteosarcoma is difficult especially in low grade osteosarcoma, even if clinical or radiographical findings suggest to osteosarcoma. So suspcious to malignant bone tumor in clinical or radiological findings, biopsy should be taked from deep portion and multiple area, and sharing the patient history and radiographs with pathologist will assist in the development of the diagnosis. We report a case of low grade osteosarcoma on the mandible initially difficulty in accurate diagnosis. The patient visited our hospital for routine dental treatment but radiographic findings displayed ill-defined radiolucency with osteoid formation on the mandible. Final diagnosis was difficulty in initial biopsy but subsequent biopsy taked from deep portion presented infiltrative growth and mitosis of the tumor cell in some area with small osteoid bone formation, so we could reach final diagnosis as low grade sarcoma. We treated this patient with bloc resection of the mandible and immediate reconstruction with iliac corticocancellous block.

개에서 발생한 추간판 탈출증의 수술적 치료 1례

조재금,이재연,정성목,김명철 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2011 動物醫科學硏究誌 Vol.18 No.1

Seven-year old, castrated male pekingese was presented with sudden onset of pain and tetraparesis. He was diagnosed with multiple intervertebral disc disease (lesion: C6-7 [mild], T12-13 [mild], L2-3 [moderate] via MRI in 2006. After undergoing conservative therapy at local hospital, he had more severe symptom in December 2009 than before. In order to identify exact site, he had been taken second MRI and transferred to CNU VMTH. Definitive diagnosis is also multiple intervertebral disc disease (IVDD) with the same lesion except C3-4 (+++). The spinal cord between C3 and C4 is ventrally compressed by intervertebral disc and the compression is much more severe than other lesions. Since the symptoms were severe and took place rapidly and didn't respond to medical treatment, surgical treatment, ventral slot for new lesion(C3-4) was planned. After the ventral compression of spinal cord between C3 and C4 was achieved, he showed enhancement which is gradual return to normal neurologic response, sternal recumbency, and occasional standing. After postoperative treatment at local hospital, he fully recovered to the normal. It was considered that accurate diagnosis timely adequate treatment are essential for the cure of IVDD.

개의 심낭내 투여한 Quinidine이 삼장 유효불응기에 미치는 영향

한명철,김재형,노태호,김희열,김종진,조은주,진승원,유기동,이만영,채장성,홍순조,최규보 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.4

개에서 결직장 연접부의 림프종 1례

이재일,이수진,김영석,김명진,조성환,신상태,이영원,김명철 충남대학교 수의과대학 동물의과학연구소 2003 動物醫科學硏究誌 Vol.11 No.-

A five years old female Shih-tzu was referred to the veterinary medical teaching hospital at Chungnam national university with soft bloody diarrhea and tenesmus. On rectal palpation, solid mass was palpated in colorectal region. In radiographs, small intestine was deviated cranially, descending colon and rectal junction were deviated caudoventrally in lateral projection of the abdomen. In ultrasonographs, hypoechoic nodulation of mesenteric lymph node in colorectal junction, mixed echoic thickening of colorectal wall and irregular margination were observed. Rectal endoscopy revealed that colorectal men was partially obstructed due to compression of the mass. Also, severe ulceration, inflammation and hemorrhage were also observed in descending colon. The mass was resected through the laparotomy. In histopathology, it was diagnosis of lymphoma in the colorectal junction.

관동맥연축의 진단을 위한 Ergonovine Echocardiography의 안전성 및 임상적 유용성

송재관,박성욱,강덕현,조구영,나득영,이내희,이철환,홍명기,김재중,박승정 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.8

동물원에서 사육중인 Japanese Macaque (Macaca fuscata)에서 Zoletil 마취에 관한 연구

이재일,이수진,홍성혁,신남식,김덕환,박창식,전무형,조종민,김영석,김명철 충남대학교 형질전환복제돼지연구센터 2004 논문집 Vol. No.8

To evaluate the effects of Zoletil (tiletamine-zolazepam) that have been widely used for the chemical restraint and anesthesia of primates, on physiologic alteration, blood gas analysis and anesthetic duration in the Japanese macaque(Macaca fuscata), this study was carried out. Zoleril was administered by intramuscular injection, Evaluation of temperature, heart rate, respiration rate and blood gas analysis were performed before administration ancl at 1,10, 20, 30, 40, 50 and 60 min after administration, and induction and maintenance time was recorded. There was no significant difference in heart rate, PCO₂PO₂after Zolcril administration and temperature, respration rate, pH were significant difference compared with those of before administration, The induction time was 2.5±l.Omin and maintenance time was 86±23.2min. It was considered that Zoletil could he usefully used for the sedation and immobilization of Japanese macaque reared in zoological garden.

24주간 추적하는 임상 연구에서 한국인 남자 알코올 의존 환자의 비재발률

강철중,김성곤,남궁기,조동환,이병욱,최인근,최용성,박성봉,제영묘,김현경,김성연 大韓神經精神醫學會 2006 신경정신의학 Vol.45 No.1

Objetives : In order to provide useful data tbr the further clinical studies with Korean alcohol-dependent patients, enrollment and non-relapse rates were investigated while alcohol-dependent patients wcre followed up for 24 weeks. Methods : The subjects of this study were alcohol-dependent male patients who, for the first time, visited a hospital among 3 groups of hospitals, University Hospital, General Hospital or Mental Hospital, or those who needed to be followed up after discharge from those hospitals. After assigning 12 subjects to each hospital, we investigated enrollment and non-relapse rates while cognitive-behavioral therapy and pharmacotherapy were provided. Results : 1) Forty-eight patients were enrolled and the rate of enrollment was 36.4%. The enrollment rate in the University Hospital group was 52.1%, in the General Hospital group 50.0%. and in the Mental Hospital group 10.4%. 2) In 48 patients, non-relapse rate was 27.1% at 12 week and 18.8% at 24 weeks after starting follow-up. It was 24.4% and 20.0% at 12 and 24 weeks, repectively, in the University Hospital group while the General Hospital group showed 33.3% and 16.7%, respectively, and the Mental Hospital Group showed 20.0% at both 12 and 24 weeks. Conclusion : These results provide important data for further clinical studies of Korean alcohol-dependent patients.

레이저 재료 가공을 위한 광폭빔 광학 장치

전병철,조응산,김재도 한국레이저가공학회 1998 한국레이저가공학회지 Vol.1 No.1

A new wide laser beam optical system for the laser materials processing has been developed with a polygonal mirror. It consists of polygonal mirror and cooling part that prevents the surface of rotating polygonal mirror from damage by heat. The polygonal mirrors have been designed and made as 24 and 30 facets in pyramid type. This system provides a uniform linear laser heat source with the surface scanning width from 15 to 50mm according to the scanning height. To examine the wide laser beam, He-Ne laser is used. Also, Acryl is used to confirm the laser beam pattern by bum-pattern print. to analyze the energy distribution of the wide laser beam, empirical values and theoretical values are compared and discussed. To improve the efficiency of the wide laser beam optical system, methods are suggested by the optical theories. For larger area processing like turbine blade, drawing roller, cold roller and guide plate, optimal overlapping locations have been calculated and analyzed by geometric and optical theories.