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양종훈,이동원,김양훈,현명택,김신 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.1
The natural convection driven by a thermal buoyancy force was investigated in a square cavity. The top and bottom walls are cold and hot. respectively. while the vertical boundaries are adiabatic. A control volume approach with a power-law scheme was used to formulate the finite difference equations. The results are presented isotherms. velocity vectors, Nusselt numbers and critical Rayleigh numbers for the ranges of Ra = 1750~20000 and Pr = 0.05~10.0. The critical Rayleigh number increases as Prandtl number decreases. There exists a clockwise unicell flow near critical Rayleigh number, while two cells appear for large Rayleigh number.
양광영,임경택,이동하,김택현,김인권 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.1
The purpose of this work is to investigate fatigue damage of quasi-isotropic laminates under tensile loading in different directions. Low cycle fatigue tests of [O/-60/+60]s laminates and [+30/-30/90]s laminates were carried out. Materials systems used are AS4/Epoxy and AS4/PEEK. The fatigue damage of [+30/-30/90]s is very different from that of [O/-60/+60]s. The position of delamination generated at AS4/Epoxy and AS4/PEEK laminates were differentiated by the matrix difference that is, we suppose, the value of both G (critical energy release rate of mode-I) and G (critical energy release rate of mode-Ⅲ) difference. The experimental results are compared with the result obtained from the method of determining strain energy release rate components proposed by the authors.
공공건설공사의 사업단계별 관리업무 순위 결정 : 책임감리와 건설사업관리를 중심으로
김양현,구교진,현창택 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
As the construction projects have become more complicated and larger in scale, management have been more important in construction. But owner in public sector usually commits construction supervision to the private management firms. So there is a big problem that Supervision doesn't control cost, time, contract and so on. The purpose of this study is to select the priority decision of construction management tasks according to project phases, especially in public sector. This study may help owner when owner contracts management service with private management firms.
김택헌,양성봉 연세대학교 산업기술연구소 2000 논문집 Vol.32 No.1
Until very recently shopping agents in electronic commerce have been made to compare only the prices of goods. They do not consider the preferences of customers. So the customers have hardly any satisfaction on their purchases because they do have different personalities toward purchasing goods. In this paper we develop an intelligent shopping agent that supports multi-dimensional comparison shopping. It tries to match the customers' needs by considering various aspects of the preferences of the customers. In order to estimate the preferences a shopping agent should be able to analyze both the feedbacks from each customer and the transaction information of the customer. It then recalculates the customer's preference for the future. An intelligent shopping agent should also adapt dynamically to the changes in the preferences of customers. The shopping agent presented in this paper has shown quite acceptable results for each customer who is assumed to have a distinctive preference. And we could confirm noticeable improvements on the customers' satisfaction through our various experimentation.
Rifampicin에 의한 Clostridium difficile-associated disease 1예
김양기,이영목,어수택 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2
Clostridium difficile-associated disease (CDAD) is a common cause of antibiotics-associated diarrhea. Rifampicin is one of the first line agents in treatment of tuberculosis and a large number of patients are exposed to its potential adverse effects. We report a case that diarrhea due to CDAD after receiving antituberculous medication, and which was probably caused by rifampicin. A 76-year-old female was admitted with general weakness and fever of 6 days duration. The patient was diagnosed as active pulmonary tuberculosis following sputum AFB smear. She was started on isoniazid, rifampicin, ethambutol and pyrazinamide as antituberculous medication. She complained watery diarrhea at sixth days after antituberculous medication, and was positive result for C.difficile toxin. She was diagnosed as CDAD, and treated with oral metronidazole and continuous antituberculous medication without rifampicin. Diarrhea did not recur after antituberculous medication without refampicin continued. In patients with persistent diarrhea receiving anti-tuberculosis treatment, rifampicin associated CDAD should always be kept in mind.
양종훈,이동원,김양훈,현명택,김신 濟州大學校 工科大學 産業技術硏究所 1998 尖端技術硏究所論文集 Vol.9 No.1
The natural convection driven by a thermal buoyancy force was investigated in a square cavity. The top and bottom walls are cold and hot, respectively, while the vertical boundaries are adiabatic. A control volume approach with a power-law scheme was used to formulate the finite difference equations. The results are presented isotherms, velocity vectors, Nusselt numbers and critical Rayleigh numbers for the ranges of Ra = 1750 ∼ 20000 and Pr = 0.05 ∼ 10.0. The critical Rayleigh number increases as Prandtl number decreases. There exists a clockwise unicell flow near critical Rayleigh number, while two cells appear for large Rayleigh number.
어수택,김양기,이영목 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2
A bronchial carcinoid tumor is identified in the patients with cough and normal chest PA or during routine examination of chest PA. Sometimes it is very difficult to diagnose the bronchial carcinoid tumor with normal chest PA, especially if the patient complains the typical symptoms of bronchial asthma. We experienced a 30 year-old female, who had been suffered from coughing and dyspnea in spite of asthma medications for 1 year, with bronchial carcinoid tumor. We describe here a case of bronchial carcinoid tumor mimicking refractory bronchial asthma.
김대석,김양택,현창택 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.1
Maintenance is an important phase in Life Cycle of facility because it is the longest and costly phase. However, in Korea, there are many cases that the increasing of operating cost and the rising of remodeling effort are resulted from ignoring the importance of maintenance after facility completion. Recently, Maintainability has been studied by CII(Construction Industry Institute) in United States. The purpose of Maintainability is to increase project performance effectiveness through considering for maintenance about the facility elements at the design phase. This paper uses benchmarking for CII's Maintainability model and proposes that the combining Maintainability into Value Engineering at the design phase so that Maintainability can be applied to the domestic industry.
난소암 환자 복수내의 면역복합체로부터 새로운 암관련항원 존재 확인
노만택,박장환,정용훈,김정목,김경태,조양자 한양대학교 의과대학 1993 한양의대 학술지 Vol.13 No.2
Immune complexes were isolated from ascitic fluid of patients with ovarian carcinoma by using protein-A Sepharose CL-4B affinity chromatography, and antigen-antibody complexes then dissociated by ion exchange chromatography in the presence of 8M urea. Only one antigen fraction was obtained by the ion exchange chromatography, but three antigenic bands were demonstrated by SDS-PAGE. The molecular weights of the three protein bands were 70, 41, and 38 kDa, respectively. Of the three proteins the 38 kDa band has already been known, but 70 and 41 kDa bands seems to represent new ovarian tumorassociated antigens. This study may suggest the involvement of multiple antigens in ovarial tumor which can be included in producing tumor-directed monoclonal antibodies