http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
실시간 시스템에서 퍼지 검사점을 이용한 주기억 데이터베이스 프로토타입 시스템의설계
박용문 ( Yong Mun Park ),이찬섭 ( Chan Seob Lee ),최의인 ( Eul In Choi ) 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.6
As the areas of computer application are expanded, real-time application environments that must process as many transactions as possible within their deadlines, such as a stock transaction systems, ATM switching systems etc, have been increased recently. The reason why the conventional database systems can``t process soft real-time applications is the lack of prediction and poor performance on processing transaction``s deadline. If transactions want to access data stored at the secondary storage, they can not satisfy requirements of real-time applications because of the disk delay time. This paper designs a main-memory database prototype systems to be suitable to real-time applications and then this system can produce rapid results without disk i/o as all of the information are loaded in main memory database. In thesis proposed the improved techniques with respect to logging, checkpointing, and recovering in our environment. In order to improve the performance of the system, a) the frequency of log analysis and redo processing is reduced by the proposed redo technique at system failure, b) database consistency is maintained by improved fuzzy checkpointing. The performance model is proposed which consists of two parts. The first part evaluates log processing time for recovery and compares with other research activities. The second part examines checkpointing behavior.
비동기적 갱신 의도 선언에 의한 트랜잭션 처리의 회피 - 기반 캐쉬 일관성 유지 기법
박용문(Yong-Mun Park),이찬섭(Chan-Sub Lee),최의인(Eui-In Choi) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.2Ⅰ
고속 LAN과 같은 통신 장비의 발달로 클라이언트/서버 시스템 환경이 일반화됨에 따라 데이터베이스 시스템도 클라이언트/서버 환경을 지원하는 데이터 서버로서의 역할이 요구되었다. 또한, 다양하고 복잡한 형태의 제어 시스템들이 필요한 각 응용 분야에서 클라이언트/서버 시스템이 이용되고 있다. 이러한 상황에서 클라이언트들은 통신 비용 절감과 서버의 부하를 줄이기 위해 클라이언트의 버퍼에 데이터의 사본을 캐쉬(cache) 함으로써 클라이언트 시스템의 확장성 및 독립성을 추구한다. 하지만, 캐쉬한 데이터의 사본에 의해 갱신 연산이 수행되기 때문에 캐쉬 데이터의 일관성 유지를 위한 효율적인 방법들이 필요하다. 본 논문에서 제안한 기법은 클라이언트/서버 간의 데이터 전송이 페이지 단위로 행해지는 페이지-서버 환경에서 적용되는 회피-기반(avoidance-based) 기법으로써, 클라이언트가 데이터를 갱신할 때 갱신 의도를 비동기적으로 선언하는 캐쉬 일관성 유지 기법을 제안하였다. 그리고 제안한 기법과 최근에 제안된 기법들을 비교 분석하였다.
클라이언트 / 서버 환경에서 클라이언트 기반 로깅을 이용한 회복 기법
박용문(Yong Mun Park),이찬섭(Chan Seob Lee),김희수(Hee Soo Kim),최의인(Eui In Choi) 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.8
The existing recovery methods that use the logging technology in client/server systems manage all log only at the server. Potentially, it involves a transmission cost for log recording performed for certain transaction at each client and it increases network traffic. In this paper, we propose a redo-only log record method which can remove an overlap before-image and can support client base on logging method so as to get rid of the transmission cost required for log recording. This method also perform redo recovery process by using a backward client log analysis by itself when the client system is destroyed. When the server system is destroyed, each client send only after-image to server by using a backward client log analysis. After then, the server perform redo recovery process by using both the received after-image and backward log analysis.
실시간 시스템에서 퍼지 검사점을 이용한 주기억 데이터베이스 프로토타입 시스템의설계
박용문,이찬섭,최의인,Park, Yong-Mun,Lee, Chan-Seop,Choe, Ui-In 한국정보처리학회 2000 정보처리논문지 Vol.7 No.6
As the areas of computer application are expanded, real-time application environments that must process as many transactions as possible within their deadlines, such as a stock transaction systems, ATM switching systems etc, have been increased recently. The reason why the conventional database systems can't process soft real-time applications is the lack of prediction and poor performance on processing transaction's deadline. If transactions want to access data stored at the secondary storage, they can not satisfy requirements of real-time applications because of the disk delay time. This paper designs a main-memory database prototype systems to be suitable to real-time applications and then this system can produce rapid results without disk i/o as all of the information are loaded in main memory database. In thesis proposed the improved techniques with respect to logging, checkpointing, and recovering in our environment. In order to improve the performance of the system, a) the frequency of log analysis and redo processing is reduced by the proposed redo technique at system failure, b) database consistency is maintained by improved fuzzy checkpointing. The performance model is proposed which consists of two parts. The first part evaluates log processing time for recovery and compares with other research activities. The second part examines checkpointing behavior.
의사들의 암 조기검진 권고 실태 분석 - 위암, 자궁경부암, 유방암을 중심으로 -
박용문,염근상,구정완,임현우,이강숙,김훈교,이원철,Park, Yong-Mun,Yum, Keun-Sang,Koo, Jung-Wan,Yim, Hyeon-Woo,Lee, Kang-Sook,Kim, Hoon-Kyo,Lee, Won-Chul 대한예방의학회 2000 Journal of Preventive Medicine and Public Health Vol.33 No.1
Objectives : The purpose of this study was to examine the present status of cancer screening recommendations(beginning age, interval, recommended screening methods, etc.) by physicians and analyze the association between physician's characteristics and the content of their recommendations. Methods : Data were collected from March 1 to April 30 of 1997, and 373 physicians who were from different hospital settings all over Korea were interviewed by telephone about their screening recommendations for stomach, cervical and breast cancer for these who provided cancer screening services. Results : For stomach cancer screening, respondents recommended that cancer screening begin at 40 years of age(57.8%), with a 1 year interval(77.2%), and by gastrofibroscopy (86.2%). For cervical cancer screening, respondents recommended that cancer screening begin at 25 years of age(42.0%), with a 1 year interval(67.8%), and by using a Pap smear(100.0%). For breast cancer screening, respondents recommended that cancer screening begin at 35 years of age(38.7%), with a 1 year interval(57.3%), and by mammography (97.3%). Conclusions : To establish appropriate cancer screening recommendations for Korea, if may be useful to consider the above results concerning medical care providers.
클라이언트/서버 환경에서 클라이언트 기반 로깅을 이용한 회복 기법
박용문,이찬섭,김희수,최의인,Park, Yong-Mun,Lee, Chan-Seop,Kim, Hui-Su,Choe, Ui-In 한국정보처리학회 2000 정보처리논문지 Vol.7 No.s8
클라이언트/서버 데이터베이스 시스템에서 로깅 기법을 사용하는 기존 회복 기법은 서버에서만 전체 로그를 관리한다. 이는 잠재적으로 각 클라이언트에서 수행되는 트랜잭션에 대한 로그 레코드의 전송 비용을 내포하고 있고, 네트워크 트래픽을 증가시킨다. 본 논문에서는 로그 레코드의 전송 비용을 제거하기 위해서 클라이언트 기반 로깅(client-based logging)을 지원하고, 중복된 before-image를 제거하고 재수행 전용 로그(redo-only log)만을 로깅하는 방법을 제안한다. 그리고 클라이언트 파손 시 클라이언트에서 자치적으로 한번의 후방향 클라이언트 로그 분석을 이용한 재수행 회복을 하고, 서버 파손 시 각 클라이언트에서는 병행적으로 후방향 클라이언트 로그 분석을 이용하여 회복해야 하는 페이지의 after-image만을 서버에 전송하며, 서버에서는 수신된 after-image와 후방향 서버 로그 분석을 이용하여 재수행 회복을 수행한다.
의료보험자료 상병기호의 정확도 추정 및 관련 특성 분석 -법정전염병을 중심으로-
신의철,박용문,박용규,김병성,박기동,맹광호,Shin, Eui-Chul,Park, Yong-Mun,Park, Yong-Gyu,Kim, Byung-Sung,Park, Ki-Dong,Meng, Kwang-Ho 대한예방의학회 1998 Journal of Preventive Medicine and Public Health Vol.31 No.3
This study was undertaken in order to estimate the accuracy of disease code of the Korean National Medical Insurance Data and disease the characteristics related to the accuracy. To accomplish these objectives, 2,431 cases coded as notifiable acute communicable diseases (NACD) were randomly selected from 1994 National Medical Insurance data file and family medicine specialists reviewed the medical records to confirm the diagnostic accuracy and investigate the related factors. Major findings obtained from this study are as follows : 1. The accuracy rate of disease code of NACD in National Medical Insurance data was very low, 10.1% (95% C.I. : 8.8-11.4). 2. The reasons of inaccuracy in disease code were 1) claiming process related administrative error by physician and non-physician personnel in medical institutions (41.0%), 2) input error of claims data by key punchers of National Medical Insurer (31.3%) and 3) diagnostic error by physicians (21.7%). 3. Characteristics significantly related with lowering the accuracy of disease code were location and level of the medical institutions in multiple logistic regression analysis. Medical institutions in Seoul showed lower accuracy than those in Kyonngi, and so did general hospitals, hospitals and clinics than tertiary hospitals. Physician related characteristics significantly lowering disease code accuracy of insurance data were sex, age group and specialty. Male physicians showed significantly lower accuracy than female physicians; thirties and fortieg age group also showed significantly lower accuracy than twenties, and so did general physicians and other specialists than internal medicine/pediatric specialists. This study strongly suggests that a series of policies like 1) establishment of peer review organization of National Medical Insurance data, 2) prompt nation-wide expansion of computerized claiming network of National Medical Insurance and 3) establishment and distribution of objective diagnostic criteria to physicians are necessary to set up a national disease surveillance system utilizing National Medical Insurance claims data.