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클러스터드 주문형 비디오 서버에서 검색의 효율을 높이는 배치 정책
崔榮俊,元裕憲,安柔貞 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1
One of the most important purposes in VOD (Video On Demands) sever is to suppose high quality of retrieving service to more clients in restricted times. The process that VOD server retrieves and transfers the video data on storage devices which clients request is real-time tasking, but the process that the video data is placed and saved on storage devices in non real-time tasking. So, Through considering characteristics of video data and performance of storage devices that the data is saved, we can maximize to service the real-time requests to more clients that VOD server retrieves and transfers video data. In this paper, we propose a new placement policy of disk system based on large disk system composed a many disks with varying performances, as RAID. First, we partition disks by their performance into quite a few groups. Then, we select the best disks group to save encoded video data, evaluating variable bit rate of the encoded video data.
유희중,추헌곤 호남대학교산업기술연구소 2007 산업기술연구논문집 Vol.13 No.-
일반교량의 경우,교량의 주요부재가 선형 거동한다는 가정 하에 교량을 지배하는 단일 힘 또는 응력을 결정할 수 있으므로 정량적인 내하율 산정의 지표가 되는 내하율산정이 가능하다. 그러나 압축력과 휨을 동시에 지지하는 사장교의 경우,거더와 주탑과 같은 주요부재가 두 가지 이상 힘의 복합작용에 의하여 비선형 거동을 보이므로 일반교량의 내하율 산정방법과 같은 개념을 이용하여 압축과 휨의 두 가지 힘을 고려하는 정량적인 내하율의 산정방법은 제시되지 않고 있다. 현재,강사장교 주요부재는 도로교설계기준(2005)에서 제시된 안정식을 이용하여 부재의 안정성을 검토하고 있다. 일반교량의 경우 미국이나 일본 등 해외에서도 행하여지는 내하율의 산정방법과 마찬가지로 국내에서도 경우에 따라 허용응력법과 강도설계법에 의하여 내하율 평가를 실시하고 있다. 그러나 일반교량의 내하율 평가는 공용하중을 정량적으로 평가할 수 있는 장점이 있지만 한가지의 힘계나 응력계에서 내하율을 평가하므로 사장교와 같이 휨과 축력을 동시에 받는 복잡한 구조물에서는 일반 교량의 내하율 평가방법이 사용될 수 없다. 본 논문에서는 사장교의 내하율 산정에 관하여 축력과 휨을 동시에 고려하는 방법을 제안하였으며 각 부재의 가장 위험한 하중을 재하하기 위해 SAP 2000을 사용하여 영향선 해석을 수행하여 사장교 보강형과 주탑에 대해 제안식을 적용하였다. 연구결과 휨만을 고려하는 일반교량의 방법과 휨과 축력을 동시에 고려하는 제안된 방법 및 안정식과 응력식에 의한 내하율 산정방법에 의하여 사장교의 보강형과 주탑의 내하율을 산정하여 타당성을 검증하였다. Evaluation of Rating Factor in Main Members of Steel Cable-Stayed Bridges are performed by stress and stability check which is based on K-code. The same Evaluation of Rating Factor as Rating Factor calculating method which is performed in other country is performed by ASD and LRFD in domestic. Evaluation of Rating Factor of some bridges can evaluate actual live load in fixed quantity, but Evaluation of Rating Factor of some bridges cannot be used in complicated structure subjected to bending and axial force like cable-stayed bridges. In This paper stability equation specified in K-code is applied to estimate Evaluation of Rating Factor of Steel Cable-Stayed Bridges. In This paper Rating Factor of member stability subjected to bending and axial force and wind force was calculates try to verify validity by comparing with three-Span Continuous Steel Cable-Stayed Bridges.
혈청이 마우스 간 세포주 BNL CL.2의 Nitric Oxide 생성에 미치는 영향
유지창,정헌택,김유현,진효상,김신무,배현옥 THE KOREAN SOCIETY FOR BIOMEDICAL LABORATORY SCIEN 1999 Journal of biomedical laboratory sciences Vol.5 No.1
마우스 간 세포주인 BNL CL.2의 시험관내 배양에서 혈청과 IFN-γ가 세포주의 nitric oxide(NO) 생성과 세포 손상에 미치는 영향을 알아보기 위한 실험을 하였다. 혈청이 공급된 배양에서 IFN-γ에 의한 세포 생존율은 거의 변동이 없었으나, 혈청을 제거한 배양에서는 약 65%의 생존율이 유지되었으며, NO 생성 억제제인 N -monomethy-L-arginine (NMA)의 첨가는 농도 의존적으로 세포의 생존율을 감소시켰다. 혈청이 제거된 BNL CL.2세포주는 IFN-γ단독 처리에서도 NO 를 생성할 수 있었으며, IFN-γ와 lipopolysaccharide (LPS)의 복합 처리는 세포주의 NO 생성을 상승적으로 증가시켰다. 또한 protein tyrosine kinase (PTK) inhibitor인 herbimycin A와 genistein에 의해서 NO 생성이 억제되어 PTK의 활성이 혈청이 고갈된 BNL CL.2 세포에서 NO의 생성에 중요한 역할을 담당하고 있기 때문으로 판단된다. IFN-γ의 독성은 혈청을 제거시킬 때 NO 생성 억제제에 상승적으로 간 세포를 손상시키며, 이때 NO가 IFN-γ에 의해 유도된 손상을 어느 정도 억제시키는 것을 알 수 있었다. Nitric oxide (NO) plays an important role in immunologic defense, and influences upon the functioning of secretory tissues and cells. It also exhibits cytotoxic/cytostatic activity as one of major operating effectors of the cellular immunity system. We investigated the effects of serum on the cell damages and NO production in the mouse liver cell line BNL CL.2 to establish the role of NO. We observed that, when BNL CL.2 cells were cultured in serum-free medium, they were induced to cell damage by the stimulation of IFN-γalone or IFN-γplus LPS. Serumstarved cells showed large amount of nitrite accumulation and NO synthase (NOS) expression in response to IFN-γalone in dose-and time-dependent manners, but serum-supplied cells did not. The production of NO was blocked by protein tyrosine kinase (PTK) inhibitors, genistein and herbimycin. These results suggest that the deprivation of serum in the BNL CL.2 cell culture medium might primed with the cells to produce NO when the cells are triggered by IFN-γ and the involvement of PTK signal transduction pathway in the expression of NOS gene in murine hepatocytes.
유희정,이성동,김헌수,민병근,박인호 울산대학교 의과대학 1994 울산의대학술지 Vol.3 No.1
The authors experienced a patient with insulinoma presented with neuropsychiatric symptoms. It was demonstrated that Whipple's triad is highly suggestive of the presence of an insulinoma. Therefore physicians and/or psychiatrists, who refer patients with insulinoma to third institution, always have a alertness to neuropsychiatric symptoms of insulinoma and Whipple's triad. This case also illustrated the persistence and cooperation between psychiatric and medical teams including the involvement of a neurologist, endocrinologist, and surgeon for diagnosis and treatment planning of patient with insulinoma.
IMF에 관련된 경제적 스트레스가 정신 건강에 미치는 영향
유희정,황성훈,홍진표,김헌수,이철,한오수 大韓神經精神醫學會 2000 신경정신의학 Vol.39 No.1
본 연구는 IMF에 관련된 경제적 스트레스가 정신 건강에 미치는 영향과 그 과정을 밝히기 위해 설계되었다. 스트레스 과정에 관여하는 요인으로 사회적 지지와 문제 해결 양식, 그리고 무망감을 도입했으며, 이들에 의해 스트레스의 영향이 매개되는지를 검증하였다. 경제적 스트레스의 수준에 따라 표집된 221명의 일반인들을 대상으로 우울, 불안, 신체화, 적대감, 사회적 지지, 그리고 문제 해결 양식 등을 측정하였다. 가정한 대로 실직으로 대표되는 경제적 스트레스는 정신 건강에 부정적 영향을 미치는 것으로 나타났다. 그 구체적인 양상을 살펴보면 다음과 같다. 먼저, 사회적 지지는, 높은 스트레스 조건에서 증상의 발현을 억제하는 완충 효과가 있음이 입증되었다. 두번째로, 남성이 여성에 비해 경제적 스트레스의 부정적 영향에 더 취약한 것으로 나타났다. 세번째, 경제적 스트레스는 문제 해결 양식의 다양한 구성요소중 문제 해결에 대한 무기력감에만 영향을 미치는 것으로 나타났다. 네번째, 무망감은 경제적 스트레스와 정신 건강간의 관계를 매개하는 변인임이 인과모형 검증을 통해 확인되었다. 끝으로, 이러한 결과가 스트레스 개입 프로그램 개발을 위한 이론적 기초를 제공한다는 의의가 있음을 논의 했고, 본 연구의 몇 가지 한계점을 지적하였다. This study was designed to investigate the influence of the so-called IMF-related economic stress upon the mental health and to analyze the process of the influence. As the possible variables moderating the stress process, social resource, problem solving style, and hopelessness were included. 221 male and female subjects were recruited according to the intensity of economic stress and classified into four groups(employees of solid companies, employees of the companies at risk, short-term unemployed and long-term unemployed). Relevant measures including economic stress scale, selected SCL-90R subscales(somatization, depression, hostility, anxiety), social support scale, problem-solving scale, and job hopelessness scale were administered. As assumed, it was proved that economic stress had adverse effects on the mental health. In addition to this basic causal relationship, moderating effects of several variables were found as follows: First, social support had the buffering effect upon the economic stress. That is, strong social support played the role suppressing the development of psychiatric symptoms under high stress. Second, men were more vulnerable to the adverse effects of economic stresses than women. Third, economic stresses had influence on the helplessness concerning the problem solving. However other problem solving strategies such as creative style, approach style, avoidance style, etc were proven to have no relationship with the economic stress. Fourth, in the analysis of unemployed group, it was found that hopelessness mediates the relationship between economic stress and mental health. In conclusion, the clinical implications of such findings in economic stress process were discussed and several limitations and the suggestions for future researches were also addressed.
유영삼,우훈영,조경래,최정환 인제대학교 2008 仁濟醫學 Vol.29 No.-
Benign symmetric lipomatosis is a rare disease. Its main characteristic is the symmetric massive deposits of adipose tissue, in unencapsulated form, predominatly on the neck, shoulder, back and upper exterimities. We report a case of a sixty one years old man with benign symmetric lipomatosis. He had a history of alcoholic liver cirrhosis. Due to cosmetic defomity, he wanted surgical treatment. We did a cervical lipectomy. He was satisfied with the result, and there was no evidence of recurrence.
유영삼,우훈영,조경래,최정환 인제대학교 2008 仁濟醫學 Vol.29 No.-
Fibrous dysplasia is a rare fibroosseous lesion characterized by replacement of normal spongiosa and filling of the medullary cavity of affected bones by an abnormal fibrous tissue. the skeletal structure. Its appearance in infancy is extremely rare. The authors report a case of maxillary fibrous dysplasia observed in a 36 days old infant as a left maxillary swelling. Excisional biopsy was performed to confirm diagnosis. At 1 year follow up, no new growth has been observed without further treatment. This is the youngest case never reported at any references.
유영삼,우훈영,조경래,최정환 인제대학교 2008 仁濟醫學 Vol.29 No.-
An accessory ostium can be found in the posterior fontanelle of the maxillary sinus during endoscopic examination of the nasal cavity in approximately one quarter of patients. It is not uncommon to find an accessory ostium in a CT scan. Recently, we removed a polyp from inferior meatus of a thirteenyears old girl. After polypectomy, we found accessory ostium of maxillary sinus in the inferior meatus. As far as we know, this is the first case of ectopic accessory ostium of maxillary sinus.
元裕憲,朴勇,金鍾勳 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-
A server of client-server environments has to not only minimum delay time, but also realtime processing of job. Specially, multimedia systems are need to an efficient admission control algorithm, because of clients of big-size data need to maximum processing and realtime processing. In this paper, we propose an admission control algorithm that considers both realtime requests and non-realtime requests. The proposed algorithm minimizes delay time about requests of client and efficiently uses resources of system. Using comparisons between a previously proposed algorithm and the proposed algorithm we show that the proposed algorithm improves performance in the aspect of the delay time and consumed buffer size.
衛星通信에 관한 硏究 : Filter의 性能改善을 中心으로 Especially on the Improvement of Filter Performance
鄭憲相,宋鐵,劉炳守,朴暢均,白亨來,鄭鍾熙,李炅燮 조선대학교 동력자원연구소 1986 動力資源硏究所誌 Vol.8 No.2
There are two kinds of data transmission communication method, namely, Analog communication method and Digital communication method. The latter has many excellent characteristics as compared with the former. In order to design excellent Digital Filter, the window function is studied in this paper. The conventional time-domain windowing requires N/2 stored values of the data window and N multiplications. A class of windows, called binary windows, for the frequency-domain implementation of the Discrete Fourier Transform is proposed. They do not require multiplications or stored constants ; rather, they are replaced by shift and add operations. These windows offer excellent sidelobe behavior compared with the conventional windows.