Java 서블릿을 이용한 웹 기반의 3-Tier 데이타베이스 시스템 설계 및 구현

최재원,Choe, Jae-Weon 한국통신학회 2003 韓國通信學會論文誌 Vol.28 No.1B

Conventional command-based communication services are rapidly substituted by multimedia web-based communication services at most recent times As the result, many valuable database and services that were developed by investing lots of human and material resources become to be useless Therefore in this paper we researched the methodologies and techniques for designing and implementing a multimedia web-based database system that made users easily access to database and services by updating the conventional command-based database services. 기존의 PC 통신 서비스가 최근 인터넷에 기반을 둔 멀티미디어 웹 서비스로 빠르게 대체됨으로 인해 과거 많은 인력과 자금을 투자하여 개발한 유용한 데이터베이스와 PC 통신 환경 상의 많은 서비스가 시장되는 사용자로부터 도외시되어 사장되는 문제가 발생하고 있다 이에 본 연구에서는 과거 PC 통신 환경 상에서 제공되었던 텍스트 위주의 명령에 기초한 데이터베이스 서비스를 사용자의 정보 접근이 용이한 멀티미디어 웹에 기초한 데이터베이스 서비스로 전환하기 위한 시스템의 설계 및 구현방법에 관해 연구하였다

디지탈 키콘 교환기의 실시간 운영체계 구현

최재원(Jae-Weon Choe),홍성한(Seong-Han Hong),김형수(Hyung-Soo Kim),김내진(Nae-Jin Kim),김형래(Hyung-Lae Kim),박인갑(In-Kap Park) 대한전자공학회 1993 대한전자공학회 학술대회 Vol.1993 No.11

ISDN 사설교환기의 결함내성 설계 및 구현

최재원(Jae Weon Choe),박인갑(In Kap Park),김형래(Hyung Lae Kim) 대한전자공학회 1995 대한전자공학회 학술대회 Vol.1995 No.12

무증상 한국인에서 대장 종양의 유병률 및 대장암 선별검사로서 대장내시경 검사의 역할

장혜숙 ( Hye Sook Chang ),최재원 ( Jae Won Choe ),양석균 ( Suk Kyun Yang ),명승재 ( Seung Jae Myung ),정훈용 ( Hwoon Yong Jung ),이진혁 ( Gin Hyug Lee ),홍원선 ( Weon Seon Hong ),김진호 ( Jin Ho Kim ),민영일 ( Young Il Min ) 대한장연구학회 2003 Intestinal Research Vol.1 No.2

목적: 최근 대장암의 선별검사로서 대장내시경 검사의 중요성이 강조되고 있으나, 이에 대한 국내 연구는 미비하다. 저자들은 무증상 한국인에서 대장 종양의 유병률을 알아보고, 대장암의 선별검사로서 대장내시경 검사의 역할에 대해 알아보고자 하였다. 대상 및 방법: 1998년 3월부터 2002년 7월까지 서울아산병원 건강증진센터에서 대장내시경 검사를 시행받은 3,325명의 검진자 중 직장 출혈, 최근 배변 습관의 변화, 대장암 또는 용종의 가족력이나 과거력, 염증성 장질환이나 대장 수술의 과거력 및 지난 10년 이내에 대장 내시경 검사나 대장조영술을 시행받은 적이 있는 환자 1,106명 및 대장내시경 검사가 불완전하게 시행된 11명을 제외한 2,208명을 대상으로 대장 종양의 빈도와 특성을 분석하였다. 결과: 대상군의 평균 나이는 49.2±10.1세였으며, 남자가 1,564명(70.8%)이었다. 대장 종양의 유병률은 선종 18.3%, 진행성 선종 2.0%, 대장암 0.3%이었으며, 50세 이상의 경우에는 각각 25.8%, 3.0%, 0.5%이었다. 남녀 모두 연령이 증가할수록 대장 선종, 진행성 선종 및 대장암의 빈도가 증가하였으며(p for trend<0.05), 여자보다 남자에서 대장 선종의 유병률이 유의하게 높았다(21.0% vs 12.0%, p<0.001). 한편 근위부 대장에서 종양이 발견될 확률은 원위부 대장에 종양이 있는 경우 26.0% (53/2004)로서 원위부 대장에 종양이 없는 경우의 10.3% (207/2004)보다 유의하게 높았다(p<0.001). 그러나 근위부 대장에서 관찰되는 진행성 종양의 69.2% (18/26)가 원위부 대장에 이상이 없이 고립성으로 존재한 경우였다. 결론: 무증상 한국인에서 대장 종양의 유병률은 서양에 비해 다소 낮은 경향이 있으며 또한 남녀 사이에 차이를 보인다. 따라서 한국에서의 대장암 선별검사의 지침을 마련하는데 있어 이러한 점들이 고려되어야 할 것이다. 한편 원위부 대장에 종양이 있는 경우에는 그렇지 않은 경우에 비해 근위부 대장에서 종양이 발견될 확률이 높아지지만, 원위부 대장에 종양이 있는 경우에만 대장내시경 검사를 할 경우 근위부 진행성 종양의 약 2/3를 놓치게 된다. 따라서 대장암 선별 검사로서 대장내시경 검사는 매우 유용한 것으로 생각된다. Background/Aims: Recent studies have reported the importance of screening colonoscopy for colorectal cancer. However, the prevalence of colorectal neoplasms in asymptomatic Korean population has not been determined until now. The purpose of this study was to evaluate the prevalence of colorectal neoplasms in asymptomatic Korean population and to assess the role of colonoscopy in colorectal cancer screening. Methods: We reviewed the endoscopic and pathologic reports of 3,325 patients who underwent colonoscopy at the Health Promotion Center, Asan Medical Center, from 1998 to 2002. Of them, 2,208 asymptomatic patients who underwent colonoscopy for the purpose of colorectal cancer screening were enrolled. Results: The mean age was 49.2 years and 70.8% were men. The overall prevalence of colorectal neoplasms was 18.6% and the prevalence among patients 50 years of age or older was 26.3%. The prevalence of neoplasms increased with age and was higher in the male. Patients with distal neoplasms were more likely to have proximal neoplasms than those without distal neoplasms. However, 69.2% of the patients with advanced proximal neolplasms had no synchronous distal neoplasms. Conclusions: The prevalence of colorectal neoplasms in asymptomatic average-risk Koreans seems to be lower than that in corresponding Westerns and shows a gender-difference. These results should be considered when establishing a guideline for colorectal cancer screening in Korea. Over half of the patients with advanced proximal neoplasms will not be detected if only those with distal neoplasms undergo colonoscopic screening. Therefore, colonoscopy may be useful as a screening test for colorectal cancer. (Intestinal Research 2003;2:179-185)

유전 의심성 비용종증 대장암의 빈도와 임상적 특성

양석균(Suk Kyun Yang),명승재(Seung Jae Myung),정훈용(Hwoon Yong Jung),홍원선(Weon Seon Hong),김진호(Jin Ho Kim),심기남(Ki Nam Shim),최재원(Jae Won Choe),김해경(Hae Kyung Kim),박무인,이미헌(Mi Hun Lee),김동일(Dong Il Kim),박의련(Eui Ryun 대한내과학회 2001 대한내과학회지 Vol.60 No.6

N/A Background: The current diagnosis of hereditary non-polyposis colorectal cancer (HNPCC) is dependent on a detailed family history based on the Amsterdam criteria proposed by the International Collaborative Group on HNPCC (ICG-HNPCC) in 1990. On recognizing the shortcomings of the ICG-HNPCC criteria, the Korean Hereditary Colorectal Cancer Registry (a subdivision of the Korean Hereditary Tumor Registry) designated the term uspected HNPCC for families who do not fullfill the criteria of the ICG-HNPCC but in whom a genetic basis for colon cancer is strongly suggested. The present study was designed to determine the frequency and define the clinical characteristics of suspected HNPCC. Methods: We analysed the clinical characteristics of 42 suspected HNPCC patients and their family members and compared these characteristics with that of 1,692 non-hereditary colorectal cancer patients. Results : The frequency of suspected HNPCC was 2.4% in our study. The mean age of suspected HNPCC patients at the time of diagnosis was 45.1±9.6 years and that of non-hereditary colorectal cancer patients was 57.4±11.9 years. The incidence of synchronous colorectal cancers in HNPCC was 7.1% and that of non-hereditary colorectal cancers was 0.9%. In suspected HNPCC families, 18 patients had extracolonic malignancies and the stomach cancer was the most common (55.5%). Conclusion : The frequency of suspected HNPCC among total colorectal cancer cases was 2.4% in our study. Tumors in suspected HNPCC differed from non-hereditary colorectal cancers in an early age of onset.(Korean J Med 60:507-513, 2001)

일가족 4명 모두에서 발생한 가족성 궤양성 대장염

변정식 ( Jeong Sik Byeon ),양석균 ( Suk Kyun Yang ),이윤정 ( Yun Jung Lee ),최재원 ( Jae Won Choe ),이진혁 ( Gin Hyug Lee ),명승재 ( Seung Jae Myung ),정훈용 ( Hwoon Yong Jung ),홍원선 ( Weon Seon Hong ),김진호 ( Jin Ho Kim ),민 대한장연구학회 2003 Intestinal Research Vol.1 No.1

The pathogenesis of ulcerative colitis is complicated and both the genetic and environmental factors contribute to its development. Familial occurrence is an example indicating that both the genetic and environmental factors play some parts in the development of ulcerative colitis because family members have similar genetic characteristics and have been exposed to similar environment. Familial ulcerative colitis is observed in about 10% to 20% of patients. Most such families contain only 2 affected members and families containing more than 2 affected members are relatively rare. We experienced a case of familial ulcerative colitis in which all 4 members (both spouses and their 2 sons) were affected. They had lived together for 29 years before all 4 members were affected. The first patient was diagnosed after 14 years of cohabitation and the rest were affected 13, 14, and 15 years after the first diagnosis. We report this case with a review of literature. (Intestinal Research 2003;1:72-77)

중소기업지원 종합정보시스템 구축에 관한 연구

최재원 경성대학교 공학기술연구소 2001 공학기술연구지 Vol.8 No.-

In this paper we researched implementation technologies of the integrated information system for supporting enterprise research and development. This system makes it possible for enterprises to access and use effectively all the resources-human, materials, and knowledges etc - in a university. As the result the enterprises can make their productivity increased and make their technologies developed.

정보통신 기술의 발전 및 최근동향

최재원 경성대학교 2000 論文集 Vol.21 No.2

The developing speed of telecommunication fields is very surprising. So in spite of the engineers who have professional knowledge in these area, they are much embarrassed with the endlessly new-born technologies. In this paper we just introduced the technologies and technology trends of telecommunication areas, but we hid the detail technologies of telecommunication fields. And also we presented the developing process and the developing trends of telecommunication technologies in a systematic manner. Therefore thins paper will help non-experts in this areas preparing soon coming the multimedia times and the leading roles in there job areas.

차세대 이동통신망 IMT-2000의 이동통신서비스를 위한 지능망의 활용에 관한 연구

최재원 경성대학교 공학기술연구소 1998 공학기술연구지 Vol.5 No.-

The International Mobile Telecommunications-2000(IMT-2000), what is called the third generation mobile communication, makes communication possible at anytime, at anywhere, by anyone, and for any service regardless of the services providers that supply currently existing networks and terminals. In this paper we first presented the definition and functional model of IMT-2000, and then analyze the function of each functional entity and the various services supported by IMT-2000. Next we presented the definition and structure of the intelligent network, and then analyze the various services supported by intelligent networks. And finally we compared the functions of IMT-2000 and intelligent networks, and suggested how to apply the intelligent networks in the area of mobile communication services for the forthcoming IMT-2000 mobile communication network.

멀티미디어용 고속 무선 LAN 시스템의 구조설계에 관한 연구

김정현,최재원 慶星大學校 1998 論文集 Vol.19 No.2

The current wireless LAN speed is merely 2 Mbps that only satisfies that of ISDN. Therefore it insufficient to transfer the multimedia informations including motion pictures. This research involves the development of 20 Mbps high-speed wireless LAN card which can overcome the limitation of existing IEEE 802.11 wireless LAN that has 2 Mbps transfer speed to support multimedia services. The final goal of this research is to make it possible for notebook PC's to access the multimedia Internet services with the multimedia communication among portable notebook PC's and the existing Internet wired network. To achieve the goal of this research, we first do analysis on the standard for the 20 Mbps high-speed wireless LAN to identify the system requirements and to design the architecture of the system. And then we also analysis on the operating system then design and develop our own operating system. We develope S/W, H/W and protocol for LAN card and to prototyping the high speed LAN card.