제주 차귀도 연안해역 미생물 분포 및 이화학적 특성

문영건,김만철,이준백,송춘복,여인규,김종만,박근태,손홍주,최우봉,허문수 한국환경과학회 2006 한국환경과학회지 Vol.15 No.3

情報시스템 Outsourcing의 發展 戰略에 관한 硏究

문태수,한경수 경주대학교 1996 論文集 Vol.8 No.-

This study presents the growth strategy of outsourcing service by finding out the differences of perception between user firms and system integration (SI) firms in the Korean outsourcing business. The result of data analysis reveals that there are significant differences between user firms and SI firms in some components of information systems(IS) outsourcing service. User firms selected integation of data center, as the most special changing issue, of IS environment changes. Meanwhile, SI forms choosed management of IS and VAN center, office automation(OA), management of global network, as the more important issues, in the application area of outsourcing. Also, both of them selected cost reduction and IS flexibility, as the most important issues, in the advantage of outsourcing. But they choosed the difficulty of control and the lack of operation knowledge in the disadvantage. And, they selected commonly overall IS consulting in the growth prospects of outsourcing. However, use firms choosed the introduction of client/server architecture, as the next important issues. SI firms selected the application of multimedia. These results show that there are some differences of perception between user firms and SI firms. SI firms are required to establish deep consideration and insight enough to diminish the differences in the strategic plan of outsourcing.

Lyapunov 직접법에 의한 전력계통 전압 안정도 해석

文永鉉,盧台勳,朴能洙 연세대학교 산업기술연구소 1992 논문집 Vol.24 No.1

This paper presents an approach to voltage stability analysis in power systems by using the Lyapunov direct method. Recently it has been attempted to apply the direct method to voltage stability analysis by introducing an energy function. However, the energy function approach seems to be alienated since it could not produce even the voltage collapse conditions which agrees with the results from conventional linearization approaches or sensitivity analysis approaches. In this paper, a new approach of the direct method is proposed with a Lyapunov function, which is established by including the kinetic energy and the voltage dependency of real power loads. The proposed Lyapunov function is not suitable to calculate stability region or stability to calculate stability region or stability margin. However, it is very useful to calculate the voltage collapse conditions. This paper gives rigorous derivations of voltage collapse conditions by using the Lyapunov function, which yields the exactly same results as the conventional linearization approach and sensitivity analysis. On the other hand, the voltage collapse phenomenon is interpreted in the physical sense, and the causes of voltage collapse are analyzed with the use of the proposed Lyapunov function. It is also noted that a new method is developed to calculate the power capacity limit of transmission lines in the view point of voltage stability.

主要成功要因分析과 그 活用方案에 관한 硏究 : 韓國 鐵鋼産業에의 適用事例 An Aplication Study to the Steel Industry in Korea

문태수,신영종 한국경영과학회 1991 經營 科學 Vol.8 No.1

Over the past few years, there has been a growing interest in using information technology for competitive advantage. A sustainable advantage is the key to the survival and growth of a firm. The successful implementation of information technology is dependent on efficient information systems planning. But the correct and complete information requirements for effective information systems planning are frequently very difficult to obtain. In this paper the Critical Success Factors(CSF) method was employed as a means of managerial information requirements analysis for information systems planning in Korea's steel industry. CSFs are one of the few areas of activity that must go well to ensure the success of an organization. This paper addresses the concept and hierarchy of CSF analysis as a methodology in identifying corporate information needs and concludes with the use and benefit of results of CSF analysis.

담석 환자에서 65세 이상과 미만 환자군의 비교

문언수,이태의 대한노인병학회 2000 Annals of geriatric medicine and research Vol.4 No.4

컴포넌트기반의 XML/EDI 시스템 설계 및 구현

문태수,김호진 한국정보시스템학회 2003 情報시스템硏究 Vol.12 No.1

One of the important applications for business-to-business electronic commerce is in procurement and inventory management using electronic data interchange(EDI). Using online catalogs and approved supplier lists, firms can easily create requisitions and purchasing documents. The emerging trend in EDI technology is changed from VAN(Value Added Network) based EDI to XML based EDI. This paper intends to suggest a component-based XML/EDI system using Unified Modeling Language(UML), as an application system for automobile part industry. Applying component based XML/EDI systems designed with UML methodology, we analyzed the workflow and the document on procurement process between trading partners and implemented a prototype of efficient XML/EDI system, as a surrogate of existing VAN/EDI. The result of applying object-oriented CBD(Component Based Development) technique is to minimize the risk of life cycle and facilitate the reuse of software as mentioned to limitation of information engineering methodology. It enables the interoperability with corporate legacy systems such as EFP(Enterprise Resource Planning), SCM(Supply Chain Management). This system proposes a solution to apply analysis phase and design phase in implementation of XML/EDI system The implementation of XML/EDI system using CBD shows the ease of use in software reuse and the interoperability with corporate internal information system The purchasing department with XML/EDI system can electronically communicate purchase orders, delivery schedules to external suppliers and interoperate with other application systems.

환경, 조직, 정보시스템 특성이 ERP시스템의 성공적 구축에 미치는 영향에 관한 실증연구

문태수,서기철 한국정보시스템학회 2006 情報시스템硏究 Vol.15 No.1

위암으로 오인된 악성 흑색종 수술 1 예 : A case report

이문수,김태윤,김성용,백무준,김창호,조무식 순천향의학연구소;Soonchunhyang Medical Research Institute 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

The malignant melanoma matastatic to the stomach is a rare tumor. Its treatment is controversial and median survival after diagnosis is usually <1year. Here a case of malignant melanoma metastatic to the stomach is reported in a 77 years old woman who presented with epigastric discomfort for three months, and was diagnosed as ademocarcinoma at preoperation. The patient was performed subtotal gastrectomy, gastroduodenostomy, omentectomy, and was discharged with no complication on the twenty-one posoperation day. We report a case of malignant melanoma metastatic to the stomach with a review of the literature.

제1형 당뇨병 환자에서 췌도세포 동종이식의 반복시행

양태영,정인경,서인아,오은영,조건영,오승훈,김성주,정재훈,민용기,이명식,이문규,김광원,도영수,주성욱 대한당뇨병학회 2002 Diabetes and Metabolism Journal Vol.24 No.4

연구배경:췌도세포 이식은 시술이 간편하고 안전하기 때문에 반복이식이 가능하여 그 동안 여러 센터에서 반복이식의 성공을 보고한 바 있다. 국내에서도 본 병원을 비롯하여 몇몇 센터에서 췌도세포 이식이 활발히 시도되고 있으나 사람에서의 동종이식 및 동종 이식의 반복시행은 보고된 바 없는 실정이다. 저자 등은 국내 최초로 췌도세포 동종이식을 시행하여, 혈청 C­펩타이드가 증가하고 인슐린 요구량이 감소하였으며, 혈당농도와 당화혈색소의 안정을 보였다. 그러나 이식 70일 후 다시 인슐린 요구량이 증가하고 C­펩타이드가 감소하여 췌도세포 이식을 다시 시행한 바 있다. 2차 이식 후 70여일이 지난 현재 다시 혈청 C­펩타이드가 증가하고, 인슐린 요구량이 더 감소되어 췌도세포 이식에서 반복 시행의 유용성을 보고하는 바이다. 방법:환자는 32세 남자로 17년전 당뇨병 진단 후 인슐린 치료 중이었으며, 3년전 부터는 만성신부전증으로 혈액툭석을 하고있었다. 1999년 12월 25일 신장이식을 하였고 3일 후 췌도이식을 하였으며, 두번째 이식은 70일 후 시행하였다. 췌도분리는 변형된 Recordi방법과 비연속성 자당 농도차(discontinuous density gradient)를 이용하였으며 분리한 췌도는 배양 후 환자의 신장기능이 정상화되고 미생물학 검사에서 음성을 확인한 후 경피경간으로 간문맥을 접근하여 16G 폴리 에틸렌 카테터를 이용하여 간실질에 이식하였다. 결과:1차 췌도이식시 순수분리전 췌도수는 210,000개, 순수분리후 획득한 췌도수는 90,000개, 순도 95%, 세포양 1.0mL 이었고, 2차 췌도이식시 순수분리전 췌도수는 420,000개, 순수분리후 획득한 췌도수는 370,000개, 순도 95%, 세포양 1.5mL 이었다. 1,2차 모두 간문맥을 통해 약 20분에 걸쳐 간실질에 주입하였다. 췌도이식전 인슐린요구량은 75∼75U/일, HbA1e 8∼10%, C­펩타이드 0.6ng/mL 였으며, 1차 췌도이식수 7일째 인슐린 요구량은 40U/일, C­펩타이드 1.5ng/mL, FPS 109mg/mL 였고, 40일 추적관찰 후 인슐린 요구량이 36U/일, C­펩타이드 1.8ng/mL, HbA1e 6.5∼7.0%로 안정되었다. 그러나 이식 50일째부터 인슐린 요구량이 50∼56U/일, C­펩타이드 0.6ng/mL, FPS 130∼200mg/dL로 혈당 조절이 불안정하여 다시 췌도이식을 시행하였다. 2차 이식후 50일이 경과한 현재, 인슐린 요구량은 26U/일, C­펩타이드 1.8ng/mL, FPS 90∼120mg/dL로 다시 안정되었다. 결론:췌도이식은 반복이식이 가능하며, 본 환자의 경우 인슐린요구량 감소, 혈당의 안정화 및 C­펩타이드가 상승하여 이식한 췌도의 기능을 확인할 수 있었고, 향후 스테로이드 등 면역억제가 유지 용량으로 감량되면 인슐린 요구량은 더 감소될 것으로 기대된다. Over the past 20 years, significant advances have been made in human islet transplantation. However, cases of prolonged insulin independence after islet allotransplantation have rarely been reported and over time, a slight, gradual decrease in insulin secretion appears to occur, as suggested by the lower C-peptide. Although preliminary clinical success achieved over the past few years has been considerably higher with whole pancreatic transplant than with isolated islet grafts, both approaches remain experimental. Islet grafts might gain, over time, increasing credibility and might eventually provide an easier alternative in terms of grafting procedures and patient management, as compared with the more "traumatizing" whole-pancreas transplantation. Also, using islet, re-transplantation is possible. But it is not known whether re-transplantation of islet could be suitable for those patients who lost grafted islet function. The aim of the present study was to investigate the benefits of re-transplantation of islet in previously simultaneous islets-kidney transplant (SIK) patient who have lost graft function. Methods : The recipient was a 32 year old male. First islet transplantation was underwent at December 25, 1999. However, the grafted islets lost function after 70 days. So we performed re-transplantation of islets. The isolation of islet was conducted sterilely on a laminarflow hood and isolated by a modified Recordimethod. The islet was injected slowly into the liver via a cannular placed in the potalvein for 20 minutes. Results : Transplanted islets were 90,000 IEq at first islet transplantation, 370,000 IEq at second islet transplantation. The insulin requirement was reduced from 75-85 to 35-40 U/day, the basal C-peptide level was 1.5 ng/mL at 7 days posttransplant Unfortunately, the grafted islets lost function after 70 days. After second transplantation, the insulin requirement was reduced to 26 U/day. Conclusions : Despite the continuous need for exogenous insulin therapy, islet transplantation can prevent wide glucose fluctuations, thus resulting in normalization of glycemic control and improvement in HbAlc, and also, show that islets can be successfully and safely re-transplanted intraportally in patients who have lost previously grafted islet function (J Kor Diabetes Asso 457~466, 2000).

PMSM의 강건한 속도 제어

김문수,원태연,이동희,이용길 동의공업대학 2001 論文集 Vol.27 No.1

In this paper, a robust speed control is proposed for Permanent Magnet Synchronous Motor system. PMSM without reduction gear has been widely used in high performance application such as robots and machine tools. It is well known that the control performance of the PMSM is very sensitive to load disturbance and system parameter variation. The idea of the proposed speed controller based on combination of sliding mode control. The sliding mode controller leads to fast system dynamics of slight sensitivity to the load disturbance and system parameter variations. The simulation results have proved that the proposed control scheme provides a robust control performance under load disturbance and system parameter variation.