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UML을 이용한 3-Tier 환경에서의 p2p 시스템 설계
이승아,권영직 한국의사결정학회 2002 경영과학연구 Vol.11 No.-
인터넷의 발전은 사용자들의 정보에 대한 요구를 급속히 증가시키고 있으며, 고급 정보 획득을 위한 사용료에 대한 부담도 함께 증가하고 있다. 따라서 사용자 각자가 보유한 정보들을 다른 사용자들에게 오픈 시켜 공유할 수 있도록 하는 시스템의 개발에 대한 요구가 발생하게 되었다. 이러한 요구에 맞추어 본 논문에서는 네티즌들이 서로의 컴퓨터에 접속하여 상대방이 가진 정보들을 검색하고 공유할 수 있는 p2p(peer to peer) 시스템인 「p2p-3」을 제안하게 되었다. 「p2p-3」시스템은 객체지향설계 기법인 UML을 이용하여 개발함으로써 시스템 구현의 효율성을 추구하였다. 또한 일반적인 p2p 시스템의 문제점으로 대두된 보안문제를 해결하기 위하여 3-tier 분산시스템을 이용하였다.
李相稷,崔承熙 嶺南大學校府設 基礎科學硏究所 1983 基礎科學硏究 Vol.3 No.-
Serum iron concentrations of rats which took sirupy diets dissolving substantial amount of ferrous ion and chelating agents including ascorbic acid were determined. Ascorbic acid-fed rats showed elevated level of serum iron, i.e. elevated absorption of iron as reported previously in many papers, but not all the chelating agents improved the absorption of iron. Whether or not chelating capacity of ascorbic acid for the ferrous ion contribute to the absorption of the ion remains to be answered.
서승직,이충국,최원기 대한건축학회 2003 대한건축학회논문집 Vol.19 No.10
Modern cities are confronted with a serious environmental damages such as destruction of ecosystem and climate change resulting from rapid urbanization. It has been reported that the rooftop planting system (or tree planting around a building) could solve the problems relating to greenhouse effect, energy-resource depletion, air pollution, urban inundations and underground water as well as restoration of environmentally-friendly cities. Therefore, we attempted to apply a new roof planting system, which is a geometrical shape on the rooftop system. In this paper, experimental study has been performed during the summer and the winter through the five different types of roof planting models. As a result, this experiment shows that the geometrical shape is better than existing rooftop plane of system performance. Especially, we verified that new roof planting system with furrow shape have the advantage to previous predicted problems, namely, soil weight, surface, thermal performance, drainage, isolation and evaporation of soil. Finally, additional studies are required to the considerable factors for practical use.
오영상,이은우,정종혁,문승원,김수현,김동한,양혁승,박정환,박경옥,강성수,이영직 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2
Tracheobronchopathia osteoplastica is a rare disorder of unknown cause characterized by the projection of numerous bony or cartilaginous submucosal nodules into the tracheobronchial lumen with sparing of the posterior membranous portion of tracheobronchial tree. In the past, most of the cases were diagnosed as secondary finding at autopsy. Nowaday, the key component of the evaluation is flexible fiberoptic laryngoscopy and bronchoscopy, which typically demonstrates irregular spicules of subrnucosal bone and cartilage projecting into the tracheobronchial lumen and causing various degrees of airway obstruction. A 45 years old man was visited Sunchon St. Carollo hospital due to discomfort on throat. We saw several nodules just below vocal cord via laryngoscope. The computed tomography revealed multiple small calcified nqdules on trachea and both main bronchi. Pathologic finding of bronchoscopic biopsy showed abnormal proliferation of bony and cartilagious nodules in the tracheal submucosa. These fingdings were consistent with tracheobronchopathia osteoplastica. We report here on a case of tracheobronchopathia osteoplastica with review of literature.
Rifampicin에 의한 것으로 추정되는 위막성 대장염1예
김수현,이은우,정종혁,문승현,김동한,양혁승,오영상,김호동,김도현,박혁,박정환,박경옥,이영직 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2
Pseudomembranous colitis, caused by altering the normal colonic flora and allowing the multiplication of Clostridium difficile, is an deleterious adverse effect of antibiotics. But it is rarely reported by rifampicin. Rifampicin is one of the first line drug in the treatment of tuberculosis and many patients are exposed to its potential adverse effects. We experienced a patient that had abdominal discomfort and hematochezia due to pseudomembranous colitis after receiving antituberculous medication, and which was probably caused by rifampicin. A 82 years old man was admitted with abdominal discomfort and hematochezia for one week. On the past history he had been diagnosed as endobronchial tuberculosis about 4 months ago. Colonoscopy revealed multiple discrete whitish mucosal lesion on rectosigmoid colon, and histologic findings were consistent with pseudomembranous colitis. The antituberculous agents were discontinued and vancomycin was administered. The patient's symptoms were resolved within several days. There was no recurrence after reinstitution of the antituberculous agents excluding rifampicin. We report here on a case of pseudomembranous colitis probably due to rifampicin.
김동희,이달해,성현직,오승훈,이봉섭,배상준 嶺南大學校 工業技術硏究所 1997 工業技術硏究所論文集 Vol.25 No.1
The power semiconductor switching devices(PSSD) continuously developed, Power Electronic Technology using PSSD is gradually extended. The high frequency inverter to generate the large power high frequency subject to power electronic technology pursuit various application. Also, in emboss with environmental destruction problem cause the atmosphere and the water pollution to growth of the commercial society, the research in favor of cleansing environmental a pollutant actively proceed. Cause of having a strong oxygenization in the physical world, the ozone has sterillization effect predominantly against virus, bacteria, etc and has application in decolorization, deodorization, food storage and air cleansing and has a merit that does not cause the secondary pollution by being restored to oxygen lastly. Therefore, This project describe study on the ozone generation power supply using the high frequency electric field method and the lamp type ozone generator using photochemistry, one of method of generate ozone.
장용성,이현수,서승직,박효순 대한건축학회 2005 대한건축학회논문집 Vol.21 No.2
This study intends to deriving the equation of non-airconditioned room temperature(hereafter referred to as NART) prediction from the correlation analysis of the influence of environmental design factors on the building. The relation between the NART and environmental design factors was analysed by using correlation coefficients. The equation of NART prediction was derived from the regression analysis by experimentation and simulation. In this study, the main results are summarized as follows: The average NART of experiment and simulation were evaluated to 22.0℃ and 22.6℃, respectively. An error of simulation was the 2.7%. The results from correlation analysis was con-elated with the daily average outdoor temperature, soil temperature, solar intensity, relative humidity, and air velocity in order. Con-elation coefficients of the daily average outdoor temperature, NART, and peak air conditioning load were over the 0.75. According to the sensitivity analysis of environmental design factors and air conditioning load in reference model, the influence of air infiltration and window surface ratio were more than outside insultion.
최원기,이동권,안명환,서승직 대한건축학회 2004 대한건축학회논문집 Vol.20 No.6
This paper is focused on evaluation of daylight reflecting performance from the adjacent building for improvement of poor environment conditions in a metropolitan area. The numerical model developed can be used for evaluation of daylight reflecting performance. As a result comparison of our simulation programs and commercial softwares, it was verified that there was no difference between two results. In this study, the sensitivity analysis of environmental performance factors of daylight reflecting from the adjacent building were examined, analysed and presented as a solution method for improvement of building environments. The results were proved to be an effective control methods for improvement of building environment, especially in a metropolitan area.