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ECAP 강가공에 의한 5083 Al 합금의 초소성 변형
이정국,서창우,김병철,신동혁 漢陽大學校 工學技術硏究所 2000 工學技術論文集 Vol.9 No.1
초기 결정립 크기가 200 μm인 상업용 5083 Al 합금에서 equal channel anglar pressing(ECAP) 강가공에 의하여 결정립을 초미세화 시킬 수 있었다. ECAP는 200℃에서 수행되었고, 반복 passes시 180˚ 회전을 주면서 같은 시편에 8 passes까지 강가공을 가하였다. 미세조직 특징은 1 pass후 평균 0.2 μm의 폭과 0.8 μm의 길이를 갖는 연신된 평행한 bands가 균일하게 형성 되었고, 4 passes후 결정립 크기가 약 0.3 μm인 등축의 초미세 결정립이 얻어졌다. 이러한 초미세 결정립을 갖는 5083 Al 합금에서 저온 초소성 성질이 얻어졌는데, 약 0.5 μm의 결정립 크기를 갖을 때 250℃이하의 온도에서 연신율이 200 %이상인 초소성 거동을 나타내었다. An ultrafine grained structure was introduced into a commercial 5083 Al alloy with the initial grain size of ∼200 μm using the equal channel angular pressing technique. Equal channel angular pressing was successfully conducted at 200℃ and the results showed that the microstructure was reasonably homogeneous after single passage and consisted of parallel bands of elongated substructure having the average width of 0.2 μm and the average length of 0.8 μm. Repetitive passes were conducted on the same sample up to total 8 passes through the die so that the sample was rotated 180˚ around its longitudanal axis between passes. An equiaxed ultrafine grained structure of ∼0.3 μm was obtained in the present alloy after 8 passes. It was found that a 5083 Al alloy with the grain size of ∼ 0.3 μm exhibited a superplastic-like behavior with elongation to failure in excess of 200% below.
운동 프로그램이 중년남성의 건강관련체력 및 혈중지질에 미치는 영향
김도희,주동엽,김수근,정동혁,서정훈 圓光大學校 附設 體力科學硏究所 2007 體力科學硏究 Vol.29 No.-
The purpose of this study, the blood lipid level, body composition and health-related fitness of middle-aged man. who have not participated in regular exercise programs were analyzed by making them carry out of swim and weight exercise program for twelve weeks. Analysis of health-related fitness of After the swim & resistance exercise program was carried out, body composition were significant differences in body weight, % fat, LBM and BMI. There were significant differences in factor was muscular of back strength, flexibility of sit and reach. But there no significant difference in endurance of sit-up and cardiovascular of VC, VO_(2). Analysis of blood lipid that After the combined exercise program was carried out, blood lipid were significant differences in TC, LDL-C and TG. But there was no significant differences in HDL-C.
A Case of Cephalic Tetanus with Unilateral Ptosis and Facial Palsy
Dong Hyuk Seo,김태욱,Dae Kyung Cho,Hee Chung Kwon 대한재활의학회 2012 Annals of Rehabilitation Medicine Vol.36 No.1
Cephalic tetanus is defi ned as a combination of trismus and paralysis of one or more cranial nerves. Cranial nerves III, IV, VI, VII, and XII may be aff ected, but the facial nerve is most frequently implicated. A 64-year-old female visited hospital for left ptosis followed by facial palsy after a left forehead abrasion in a car accident. At nine days post injury, left ptosis developed, left facial palsy developed twelve days post injury, and at fi fteen days post injury,trismus and dysphagia developed. Th e following day, there was progression of symptoms to generalized tetanus,such as dyspnea and generalized rigidity. Videofl uoroscopic swallow study showed penetration and aspiration. We report a case of cephalic tetanus with ptosis, facial palsy, and dysphagia, which progressed to generalized tetanus.
Dong Hyuk Seo,김태욱,이성재,현정근 대한재활의학회 2012 Annals of Rehabilitation Medicine Vol.36 No.5
In herpes zoster infection, neurological complications may be overlooked because pain is a more prominent symptom and because peripheral polyneuropathy associated with weakness is rare. A 57-year-old male visited our hospital, complaining of pain and skin eruptions on the right flank. He was diagnosed as having herpes zoster and the symptoms were alleviated by administration of acyclovir for a week. After three weeks, the herpes zoster relapsed. He was re-admitted and diagnosed with chronic myeloid leukemia (CML), and imatinib mesylate was prescribed for five weeks. Ten weeks after the onset of herpes zoster, bilateral foot drops and numbness of the right foot dorsum developed. Through an electrodiagnostic study, he was diagnosed as having peripheral polyneuropathy that was suspected to be caused by neural invasion by varicella zoster virus. After administration of famciclovir, not only the pain but also the neurologic symptoms improved. We herein report a case of peripheral polyneuropathy that was supposed to be related to herpes zoster.