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ORDBMS를 이용한 데이터 웨어하우스 구축에서 질의어 처리의 성능 향상을 위한 인덱싱 기법
조완섭,이정남,이충세 충북대학교 컴퓨터 정보통신 연구소 1999 컴퓨터정보통신연구 Vol.7 No.2
차세대 DBMS로 각광을 받고있는 객체-관계 DBMS를 사용하여 데이터웨어하우스(data warehouse)를 구축하는 방안과 성능향상을 위한 인덱싱 기법을 제안한다. 지금까지 관계 DBMS와 다차원 분석 도구를 사용하여 데이터 웨어하우스를 구축하는 방안이 주로 제시되었으나, 객체-관계 DBMS를 사용한 데이터 웨어하우스의 구축에 관한 연구는 거의 이루어지지 않고 있다. 데이터 웨어하우스는 기존의 데이터베이스와는 비교할 수 없을 만큼의 대용량 데이터를 가정하므로 객체-관계 DBMS를 이용하여 데이터 웨어하우스를 구축하는 경우 적절한 성능의 보장이 중요한 과제이다. 이 논문에서는 ORDBMS 엔진의 성능향상을 위한 인덱싱 기법을 제안하고, 이를 이용한 질의처리 성능을 분석한다. 제안된 인덱싱 기법을 사용함으로써 질의에 포함된 비용이 큰 조인과 그루핑 연산은 비용이 저렴한 인덱스 액세스 연산으로 대치되며, 데이터의 양과 거의 무관하게 질의 처리비용이 고정되는 효과를 얻을 수 있다. We propose a data warehouse construction scheme based on ORDBMSs and an indexing technique to enhance the performance of the dta warehouse systems. In spite of active research on the construction of relational data warehouses, few research has been done for the usage of ORDBMSs in the data warehouse environments. Since the data warehouse assumes huge amount of data, performance of the systems is a critical issue. In this paper, we propose an indexing technique for the data warehouse systems, and analyze the performance of the query evaluation by using the indexes. Proposed indexing technique replaces costly join and group-by operations by the index access operations having lower cost and fixes the query evaluation cost almost irrelevant to the size of the data warehouses.
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보건관리 대행사업 평가도구의 타당성, 신뢰도 및 인과관계 검증에 관한 연구
박정일,조병희,구정완,김광종,김현욱,원종욱,이명숙,정문희 가톨릭대학교 산업의학센터 2001 韓國의 産業醫學 Vol.40 No.1
In order to verify the validity, reliability and relativeness of preliminary evaluation tool for the group occupational health services(GOHS), a questionnaire survey for doctors, nurses and hygienists of 18 GOSH institutions, and employers, health managers and employees of 340 enterprises was conducted. A factor analysis and correlation test for the statistical validity of the variables in the evaluation tool, a Chronbach's Alpha value for the reliability in the evaluation indices and a regression analysis for the relations of the evaluation model were performed. The results were as follows: 1.In factor analysis, thirty-three variables among 43 variables were selected as significant variables, ie 9 out of 11 for input index, 11 out of 14 for throughout index and 13 out of 18 for out put index. 2.Three evaluation(outcome) scales(evaluation by employer, health manager and employee) which composed of 16 identical items were used. 3.The Chronbach's Alpha values of input, throughout, out put and outcome indices were 0.5221, 0.5473, 0.7122 and 0.8546 respectively. 4.Regression equations of independent variables on the evaluation scales of employer, health manager and employee were all statistically significant.
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박정일,조병희,구정완,김광종,김현욱,원종욱,이명숙,이원철,정문희 가톨릭대학교 산업의학센터 2000 韓國의 産業醫學 Vol.39 No.3
This study was carried out to develop the index and the scales for the evaluation of the group occupational health services(GOHS). The possible variables of each step, firstly, based on an evaluation model composed of four steps, input, throughout, output and outcome, were selected through several meetings of professional committee. And five types of questionnaire(for doctor, nurse, industrial hygienist, employer, and employee) were developed based on the selected variables. A pilot survey for four GOHS institutions and 12 enterprises was conducted using the questionnaires and correlation analysis for extracting variables was done. The results were as follows: 1.The evaluation scale was composed of three areas(evaluation on workers' health and work environment, evaluation by institution and employer, and evaluation by employee)which were devided into ten subscales. 2.Among firstly selected ninety-six variables, forty-three variables (11 for input, 14 for throughout, and 18 for output indices) were extracted by correlation analysis. 3.Based on the extracted variables, the questionnaires were simplified as five items for doctor, thirty-six items for nurse, nine items for industrial hygienist, and twenty-six items for employer and employee. 4.The total score of evaluation model was defined on the basis of four-hundred points as sum of four indices (input, throughout, output and outcome) given one-hundred points each.
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이규완,이충휘,조상현,박정미 한국전문물리치료학회 2001 한국전문물리치료학회지 Vol.8 No.1
The purposes of this study were to investigate the therapeutic effects of an early exercise program after mastectomy and to provide the early exercise program protocol for patients who had undergone mastectomy. The subjects were seventy women who were diagnosed with breast cancer. They were randomly assigned either to a experimental group (n=35) that received early postoperative exercise program or to a control group (n=35) that received only education by nurses. Data were obtained for each patient from goniometric measurements of shoulder flexion, abduction, external rotation, 10 elements of functional performance, and subjective pain evaluation using visual analogue scale (VAS). All variables were measured preoperatively, three days postoperatively, and one month postoperatively. Data were compared by groups using independent t-test and Mann-Whitey U test for parametric or non-parametric data, respectively. There were no significant differences between the groups for all variables preoperatively and at three days postoperatively. But there were significant differences at one month postoperatively. The experimental group showed a statisti-cally significant increases in shoulder flexion, abduction, and external rotation and in the pain VAS at one month Postoperatively (p〈,05). Also, at one month prostoperatively, the experimental group had less difficulty with three elements of functional performance-doing up a 'back' zippered article of clothing, reaching the ipsilateral scaula, and contralateral scapula with the fingers on the operated side- than the control group (p〈.05). The results of this study suggest that after mastectomy, the early exercise program conducted by a well-trained physical therapist can make a significant contribution to the return of more normal shoulder function and activities of daily living and to an increased quality of life.
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김태완,조경욱,이충섭 忠北大學校 平生體育硏究所 1991 平生體育硏究所 論文集 Vol.5 No.-
The investigation of resarch on research on the actual condition about weight control of 137 high school or college boxing players in cheongju, Seoul, Incheon, Suwon, Yongin, and Daegu drew the following conclusions. 1) The methods of weight control were described that reducing weight was 78.15, increasing weight was 13.1% and reducing or increasing weight was 8.8%. The method of imcrease in quantity of exercise was most used as the method of reducing weight, and the methods of bathing and dieting were used a lot. 2) The best condition was in teducing 3-1Kilograms of weight and the players felt the most fatigue in reducing 5-6Kilograms of weight. The foodstuffs which they ate most in teducing weight were vegetable and fruit. Water and soft dinks weten secodly. 3) They described 6-10days before thore t heir games were the most appropriate periods of reducig weight. Many plauers were satified with methods of reducing weight, but 82.5% of them thought reducing weight was icjurious to their tealth. 4) 47.4% of them lost their games because of the failure of reducing weight. All the players described the success of reducing weight affected the victory and thd defeat of their games. Therefore we could understand weight control was another game. 5) 8% of players had experience in taking medicine in reducing weight. 30% of them had experience in reducing more 9Kilograms of weight. "Laxis" was described as the most medicine taken in reducing weight.
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Java/qmail을 활용한 인터넷 메시지 시스템 설계 및 구현
이호성,이충세,조완섭 충북대학교 컴퓨터정보통신 연구소 2001 컴퓨터정보통신연구 Vol.9 No.1
90년대 중반부터 국내에 인터넷 붐이 일어나고 사용이 보편화되면서 전자메일은 개인간의 메시지를 가능하게 해주는 기반기술 중 하나로 자리잡고 있다. 기존의 POP(Post Office Protocol) 프로토콜을 이용하던 전자메일 시스템은 별도의 환경설정 없이 지역, 언어, 시간에 제약이 없는 웹기반의 메시지 시스템으로 발전하고 있다. 현재 웹기반 메시지 시스템에 사용되어지는 MTA(Mail Transfer Agent)로는 sendmail이 사실상의 표준으로 받아 들여지고 있다. 그러나 sendmail은 단일 모듈로 작성되었으며, 사이즈가 매우 크고, 보안상의 문제점도 지적되고 있다. 이에 본 논문에서는 sendmail의 문제점을 효율적으로 해결할 수 있는 qmail의 활용방법을 제시하고, 웹과 qmail을 연계할 수 있도록 자바를 통한 웹기반 인터넷 메시지 시스템을 설계 및 구현한다. The rapid growth of the internet and World-Wide Web(WWW) has allowed more people access to global computer network and network applications. Internet Service Provider profit by offering many kinds of Internet services such as electronic mail, WWW, FTP, and others. Electronic mail service is one of the most popular and essential services in Internet. so, it called "killer application". Mail server is a computer system that sends and receives electronic message for a number of users in a certain management domain. Mail servers are connected to networks and should reliably process incoming and outgoing mail messages. Sending and receiving tasks are actually processed by a special software called mail transfer agent in the mail server(e.g., sendmail or qmail). In this paper, we present the design and implementation of Internet message system. The system integrates two different technologies - the qmail an Java servlet. Our system combines advantages from both technologies so users may remotely manage their mail system easily and effectively.
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