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서영석(Young-Suk Seo),유창식(Chang-Sik Yoo) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
Using 1/8-rate linear phase detector, 8-Gb/s Clock and data recover circuit is implemented in this paper. The proposed CDR(Clock and Data Recovery) phase detector uses 1/8-rate clock, and expands UP & DOWN pulse width than conventional linear-type CDR phase detector. Thereby the proposed phase detector speeds up CDR. Also the proposed CDR has the function of 1:8 de-multiplexing.
사무공간 적용 BIPV시스템의 자연채광 및 성능평가에 관한 연구
서영석(Seo Young-Seok),오민석(Oh Min-Suk),김회서(Kim Hway-Suh) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.2009 No.11월
By the skyscraper building, increase of skin area and expansion of curtain wall system will be the important factors of acceleration in extending supply of BIPV system. In the future interior environmental evaluation is not a necessary to the residents but an essential term which will bring enormous influence. In the interior environmental evaluation, natural light will let the residents with direct contact with outside circumstances and make them feel opened. also only the daylight has radiant energy and color rendering that will have a great influence to residents' mental, operation efficiency and advancing productivity. This research compares and analyzes BIPC system in office spaces with two general sunlight's module. In addition to natural light's efficiency for BIPC system's comfort and confirmed economical efficiency will be applied to basic research data. Hence forth, ensuring indoor intensity of illumination and controlling light system to reducing energy research data will be demanded to increase the amount of supplying BIPC system. Also continuance research in the possibility of applying BIPC system in various buildings, room temperature affected by location of windows and its condensation, and economical evaluation will be required.
한영춘(Young-choon Han),서영석(Young-suk Seo) 한국인터넷전자상거래학회 2009 인터넷전자상거래연구 Vol.9 No.3
Applying Web2.0 concepts and technologies in e-commerce(i.e., internet shopping malls) is one of the top issues recently. The purpose of this paper is to propose a new approach to implement the Web2.0-based internet shopping malls that make more sellers and buyers to participate in e-commerce. This internet shopping mall is implemented using P2P and blogs which are the major Web2.0 technologies. Based on the literature on Web2.0, the difference between Web1.0 and Web2.0 is discussed, and eight Web2.0 technologies, such as social networking, collective intelligence, mash-up, web service, podcast, P2P, blog, and RSS, are explained. The internet shopping mall proposed in this paper is composed of two parts. One is the P2P messenger, and the other is the sellers' blogs. The P2P messenger is used to create product catalogs which are stored in XML files. These catalogs are automatically registered in the sellers' blogs. In the sellers' blogs, buyers can search, select, buy products, and make payments. The P2P messenger is implemented as a C/S application using Microsoft C# based on .NET FrameWork 2.0 while the blog is implemented as a web site using ASP.NET 2.0 and MS-SQL 2005 Server.
불임인 자궁내막증 환자의 수술적 복강경 수술 후 임신율
최영민(Young Min Choi),서영석(Young Suk Seo),구승엽(Seung Yup Ku),서창석(Chang Suk Suh),김석현(Seok Hyun Kim),김정구(Jung Gu Kim),문신용(Shin Yong Moon),이진용(Jin Yong Lee) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.11
목적 : 자궁내막증 외에는 다른 불임의 원인이 없는 환자군에서 보존적 복강경 수술에 의한 자궁내막증의 치료가 임신에 미치는 영향을 알아보고자 연구를 시행하였다. 연구방법 : 본 연구는 후향적 연구로서 서울대학교병원 산부인과에 불임을 주소로 내원하여 보존적 복강경 수술을 시행받은 환자들의 의무 기록을 검토하여 조직 생검 및 수술 소견상 자궁내막증이 확진되고, 자궁내막증 이외에 다른 불임의 원인이 없으며, 수술 후 1년간 자연 임신을 시도한 환자 중 임신된 환자군의 비율을 구하고 미국 불임학회 분류 (Revised American Fertility Society classification: rAFS classification)에 의한 자궁내막증 병기 및 다양한 자궁내막증 병변에 따른 임신율을 비교하였다. 결과 : 1991년 1월부터 1998년 2월까지 보존적 복강경 수술 후 1년간 자연 임신을 시도한 환자 중에서 임신 여부를 알 수 있었던 경우는 33명이었다. 이 중에서 16명이 임신되어 48.5%의 임신율을 보였다. 3개월 이내에 임신된 환자는 12명으로 임신군의 75%를 차지하였다. 자궁내막증 병기가 I 또는 II기인 환자군 중에서의 임신율은 50%였고, III 또는 IV기에서의 임신율은 47.4%였다. 자궁내막증 병기나 각각의 자궁내막증 병변에 따른 임신율에는 통계적으로 유의한 차이가 없었다. 결론 : 이상과 같은 연구 결과로 자궁내막증이 동반된 불임 환자를 처치하는데 있어 복강경 수술의 유용성을 알 수 있었으며 특히 대부분의 임신이 보존적 복강경 수술 후 3개월 이내에 성립되었다. Objective: To investigate the influence of laparoscopic surgery on the pregnancy rate of infertile women with endometriosis. Materials & Methods: Retrospective analysis was performed in 33 infertile patients with endometriosis and infertility who had operative laparoscopy at Seoul National University Hospital from January 1991 to February 1998. We investigated the pregnancy rate during the 12 months following conservative laparoscopic surgery. Results: The overall rate of spontaneous intrauterine pregnancy rate (IUP) during the 12 months was 48.5% (16/33). Most of spontaneous pregnancy occurred during the 3 months after surgery (12/16). There was no correlation between spontaneous pregnancy rate and the revised American Fertility Society (rAFS) classification or laparoscopic findings. The rate of IUP was 50% (7/14) for patients with stage I or II endometriosis and 47.4% (9/19) for the patients presenting stage III or IV endometriosis. Conclusion: Conservative laparoscopic surgery may be an effective treatment for infertile patients with endometriosis and most of spontaneous pregnancy occurred during the 3 months after surgery .
판매자의 인터넷마켓플레이스 사용자만족도 및 재이용의도에 영향을 미치는 요인
한영춘(Young-Choon Han),서영석(Young-Suk Seo) 한국인터넷전자상거래학회 2009 인터넷전자상거래연구 Vol.9 No.1
Most of research on e-commerce has focused on buyers' behavior, i.e., use of internet shopping malls. In case of internet marketplaces, however, sellers' behavior is also important since the number of retailers participating in the internet marketplace would be one of the key factors affecting customers' buying behavior. Therefore, the purpose of this study is to analyze the factors affecting sellers' user satisfaction and reuse intention of internet marketplaces. Based on the literature on information success models, three independent variables(i.e., systems quality, information quality, and service quality) measured based on expectation-disconfirmation were introduced in the research model. The questionnaire survey was conducted and data were collected from 218 retailers selling products at the major internet marketplaces in Korea. The results of regression analysis provide the following findings. First, systems quality, information quality, and service quality were found to be significantly related to user satisfaction while none of them were related to reuse intention. Second, user satisfaction was significantly related to reuse intention.
십전대보탕가미방(十全大補湯加味方)이 Hydrogen Peroxide에 의해 손상(損傷)된 배양(培養) 척수감각신경세포(脊髓感覺神經細胞)에 미치는 영향(影響)
한동원 ( Dong Won Han ),서영석 ( Young Suk Seo ),신병철 ( Byoung Chul Shin ),권영달 ( Young Dal Kwon ),이수경 ( Soo Kyoung Lee ),송용선 ( Yung Sun Sung ) 한방재활의학과학회 2002 한방재활의학과학회지 Vol.12 No.3
Objectives:This study was carried out to evaluate the effect of Sibjeondaebo-tanggami(SJDBTGM) water extract on cultured mouse spinal sensory neurons which was damaged by hydrogen peroxide.Methods:The cultured mouse spinal sensory neurons was damaged by hydrogen peroxide-induced oxygen radicals.MTT<3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide> assay, NR(neutral red) assay, Neurofilament EIA(enzyme immuno assay) and TBARS assay were carried out after the cultured mouse spinal sensory neurons were preincubated with various concentrations of SJDBTGM water extract for 3 hours prior to exposure of hydrogen peroxide.Results:1.Hydrogen peroxide decreased the survival rate of the cultured mouse spinal sensory neuron cells on NR assay and MTT assay.2.SJDBTGM have efficacy of increasing the amount of neurofilament decreased by hydrogen peroxide.3.SJDBTGM have efficacy of decreasing the amount of lipid peroxidation increased by hydrogen peroxide.Conclusions:From the above results, It is concluded that SJDBTGM has marked an efficacy as a treatment for the damages caused by hydrogen peroxide.