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화상회의시스템 구축을 위한 실시간 멀티미디어 통신시스템 설계
이상준,서영건,오해석 崇實大學校 生産技術硏究所 1995 論文集 Vol.25 No.1
We can save the moving time for taking part in meeting through the remote conferencing system. We can quickly make a decision by using video conferencing system in real-time. In this paper, we designed an prototype model of multimedia conferencing system that contained the CSCW concept. The designed system is composed of audio server, video server, and document server, and they formulate audio subsystem, video subsystem, and document subsystem respectively. The result of this paper can provide base technology of implementing conferencing system, which may be enough to develop multimedia conferencing system for using voices, still images, full motion images in communication protocol.
Jun-Yung Oh,Dong-Seok Yang,Byeongwon Kang 한국초전도저온학회 2022 한국초전도저온공학회논문지 Vol.24 No.2
We studied the effect of substrate-induced strain state on the superconducting transition in GdBa2Cu3O7-x(GdBCO)/La0.7Sr0.3MnO3 (LSMO) bilayers deposited on a LaAlO3 (LAO) substrate. The stain state of LSMO is controlled byincreasing the thickness from 20 nm to 80 nm. Analyses on the extended X-ray absorption fine structure (EXAFS) measurementsreveal difference in the direction of MnO6 octahedral distortion depending on the LSMO thickness, which leads to a difference inanisotropy of magnetization of LSMO layer. The superconducting transitions of our system are strongly correlated with themagnetic anisotropy accompanied by the MnO6 octahedron distortion in a specific direction. This result suggests the possibility ofimproving the superconducting transition in the GdBCO/LSMO bilayer system by controlling the degree of competition betweensuperconductivity and ferromagnetism via adjusting strain state in the LSMO layer
요추 추간판 탈출증의 수술 요법과 효소 요법과의 비교 연구
오석전,김광명,김남규,정환영,이경석 한양대학교 의과대학 1987 한양의대 학술지 Vol.7 No.2
A comparative study was presented on three different therapeutic methods for herniated lumbar discs, i.e., standard discectomy, microsurgical discectomy and chemonucleolysis. For seven year period from 1980 to 1987. 3000 patients with herniated lumbar disc were selected for comparison. Each thousand patients received one of the above three methods. Not only the overall success rate but also various clinical characteristics were compared and analysed with chi-square tests. Microsurgical discectomy ccording to Chung's modified method brought the best results in not only success rate but also in failure and complication rates. The efficacy of chemonucleolysis was relatively low in this comparision, but in selected cases, it was as effctive as microspurgical discectomy. Along with its strong advantages in hospital stay, time to return to work and operating time, chemonucleolysis was the least invasive one. Thus chemonucleolysis could be perfomed with better expected success rate and the following situations. 1) The age of patient was less than 50, 2) radiating pain was a dominant symptom, 3) the symptom lasted shorter than 1 year, 4) lesions were not in L5-S1 level, 5) the patient had more than 3 abnormal findings in 5 physical and neurological signs, i.e., motor weakness, detmatomal sensory loss, reflex change, positive straight leg raising test and crossed straight leg raising test, and 6) no severe compression in myelogams. In the other two situations, chemonucleolysis could be indicated as an initial treatment. There are 7) patients of over 70-year-old and 8) lesions in more than 3 levels. No serious complications were not found in chemonucleolysis. Meanwhile in the following cases, microsugical discectomy should be considered as the first therapeutic method. 1) patient in the 6th and 7th decades, 2) low back pain as a dominant symptom, 3) duration of symptoms more than 1 year, 4) lesions in L5-S1, 5) only 2 abnormal findings in 5 signs decribed above, and 6) severe compression in myelograms. Standard discectomy did not show any significant advantages over the two methods in this comparative analysis. Any single therapeutic method could not be the best way in the treatment of patients with the herniated lumbar disc. It is desirable to choose the most suitable method for each patient according to not only the success rate of an individual method but also his clinical characteristics, radiological features, surgeon's experience and preference, and the choice of the patient himself.
오석전,고용,유영락,김남규,정환영 한양대학교 의과대학 1987 한양의대 학술지 Vol.7 No.1
Cervical computerized tomographic myelography (CTM) has been performed in 99 patients who were suspected as having various diseases in the cervical portion. After making a comparison between the results of CTM with those of water-soluble myelography and neurologic examination, the author could have the conclusion as follows; 1. Because bones and soft tissues of both shoulders make artifacts oncervical plain CT, the clearance of image is low and the diagnostic value is very poor, especially in the lower cervical portion. 2. Metrizamide, iopamidol and iohexol were used as water-soluble contrast media, but the side effects such as headache and nausea were less in iopamidol and iohexol. 3. C1C2 puncture showed clear image with less amount of contrast media than lumbar route as the route of administration of contrast media for cervical myelograpzy and CTM. 4. The author experienced that no or inadequate amount of cerebrospinal fluid was observed although C1C2 puncture was correctly performed. In such a case, cervical myelography should be done via lumbar route in stead of C1C2 puncture in the conviction that tumor mass or adhesive arachnoiditis was placed near C1C2 portion. 5. Recently, CTM is recognized as the best mthod to diagnose the cervical cord diseases except nuclear magnetic imaging. And the diagnostic accuracy is more increased if cervical myelography and CTM are complementally used. 6. C1C2 puncture can be easily performed if flouroscopic image intensifier is used. In spite of upper cervical portion th C1C2 puncture was safe and there were no complications in all 65 cases.
오찬석,박현정,이준영,조백기 대한피부과학회 2004 大韓皮膚科學會誌 Vol.42 No.1
Lichen striatus is a fairly common, linear, self-limited eruption that is seen primarily in children. The average age is 3 years, but it can occur at any age. In adults, lichen striatus often presents a quit different clinical feature rather than in childhood. It is characterized by papulovesicles, multilinearity, relapse, and histological spongiotic change. We report two cases of lichen striatus occured in a 45-year-old and 32-year-old man. (Korean J Dermatol 2004;42(1):128~130)
요추추간판 조영상의 재평가 : 요수 조영상 및 요추전산화 단층촬영과의 비교연구
오석전,유영락,김남규,김덕용,정환영 한양대학교 의과대학 1987 한양의대 학술지 Vol.7 No.1
Since 1984, lateral lumbar discography has been performed in 1100 cases which were preliminarily evaluated by myelography, CT scan, CT myelography etc. The discorgraphic findings were compared with those of the above-described various adjuncts. Technique: The patient is positioned right up on the radioluscent filming table under the aid of the fluoroscopic image intensifier. The 4-inch, 18-guage spinal puncture meedle and 6-inch, 22-guage spinal needles are directed with a two-needle method from a point 8-12 cm lateral to the spinous process of the disc to be injected, with the needle maintained at an angle of 60 degree toward the disc. Injection of the L5-S1 disc requires a 30 degree caudal angulation. If the tip of the needle is located middle 1/3 of the dics both anteriorly and laterally, 2 ml of the Urografin-60 is injected. Myelographic indentation and bulging patterns of the CT and CT myelography were closely related with discographic findings. But these findings were not uniquely linked to each other. As a primary diagnostic procedure, the discography has definite limitation and disadvantages. But unique advantage of the discography was found from these experiences. Discography offered definite information on 1) Ready communication between the disc space and the systemic venous system 2) Ruptured or extruded disc 3) Direction of extradural leakage 4) Remaining amount of intradiscally injected substance