전자상거래에 데이터마이닝 기술 적용

김종완,진승훈,김병익,김태균,김영순 대구대학교 과학기술연구소 2001 科學技術硏究 Vol.8 No.1

The definition of data mining is the non-trivial extraction of implicit, previously unknown and potentially useful knowledge from data. Also, data mining has been worked on various fields such as database, machine learning, statistics, expert systems, and data visualization, and is a process consisting of these techniques. In many E-Commerce applications, it is important to build personalized profiles of individual users from their transaction histories. These profile constitute models of individual user behavior and can be specified with sets of rules learned from user transactional histories using various data mining techniques. In this paper, we present a MAS (multi-agent system) for customer management which maintains personal user information automatically, commands retrieval of products according to user preference, and builds personalized profiles of user.

하악골에 발생한 골막 골육종

김태우,김승범,권혁찬,문선재,윤정훈,김형준,차인호,육종인,김진 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.1

Periosteal osteosarcoma is a distinct entity of malignant bone tumor with characteristic clinical, morphological, and histological features within the group of juxtacortical osteosarcoma. Periosteal osteosarcoma is predominantly located in the tubular long bones, and extremely rarely involving the jaws. A case of periosteal osteosarcoma of the right mandible is presented. A 27-year-old woman complained of the gingival swelling and bleeding tendency of the right posterior mandible. Clinical examination revealed a reddish brown strawberry-like swelling on the affected mucosa, which measured 1.5㎝×1.5㎝. The tumor was located on the lingual cortex of the mandible and extended into the surrounding soft tissues. Microscopically, the tumor consisted exclusively of atypical chondroblastic cells with a small osteoblastic area. A minimal bone marrow involvement was noted and the adjacent cortex was free of tumor. These findings suggested that the tumor originated from the periosteal cambium layer, which lies between the periosteal fibrous layer and the cortex of mandible.

대학생의 생활체육 참여와 여가만족의 관계

김흥태(Kim Hung-Tae),박종민(Park Jong-Min),최경호(Choi Kyung-Ho),전민주(Jeon Min-Ju),김보균(Kim Bo-Kyun),김성철(Kim Sug-Cheol) 한국체육과학회 2003 한국체육과학회지 Vol.12 No.2

The objective of this research is to closely examine the relationship between university students' participation in domestic sports and satisfaction levels of leisure. In order to achieve such an objective, the following factors will be closely examined. Firstly, the difference between the participation in domestic sports and the satisfaction levels of leisure is to be discussed according to the demographic characteristics. Secondly, the difference between the satisfaction levels of leisure is to be discussed according to the participation level of university students in domestic sports. Thirdly, the relationship between the participation level of university students in domestic sports and the levels of leisure is to be clearly discussed. According to that, this research focuses mainly on teams formed by male and female undergraduates from the four-year universities located in Chuncheon-city, Kangwon-do. Using a method of simple random sampling, a total of 150 students have been selected as sample groups for those who participate in sports-related clubs and domestic physical programs. Also, a total of 150 students, with the same method of selection as before, have been selected as sample groups for those who do not participate in domestic sports. As a result, a total of 300 students have been selected as sample groups. The instruments of gathering information for this research include the leisure satisfaction scale(LSS) developed by Beard and Ragheb(1980) and adapted by Lee, Jong-kil(1992). The levels of confidence and propriety for this research have been verified by questionnaires prepared by the instruments. The level of confidence for the questionnaires has shown a result of Cronbach α = .689~.894, regarded as being extremely high. Methods of correlation, one-way ANOVA and t-test have been used with SPSS Windows 10.0 Version, in order to investigate the relationship between university students' participation in domestic sports and satisfaction levels of leisure. For the post-examination, a method of Scheffe' test has been used at a significant level of 5%. The following results have been obtained from the analysis of gathered information according to the objective of this research. Firstly, among the special demographic factors of university students who participate in domestic sports, there are significant differences for the satisfaction levels among grades, household profits, health levels and credits. However, there is no significant difference between genders. Secondly, the university students who participate in domestic sports show high levels of leisure satisfaction, compared to those who do not. Thirdly, the participation level of university students in domestic sports contributes to the level of leisure satisfaction.

심혈관계 질환으로 관상질환 집중치료실에 입원한 환자들의 혜후 측정을 위한 APACHEⅢ점수 체계의 임상적 유용성

이공섭,이창선,최현주,홍종서,강지향,김도형,이민영,오인균,김병엽,김상억,김학찬,한승혜,이재용,지영우,안경주 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.8

GMM을 이용한 환경선호도 추정

김홍균,임종수,고윤희 한국환경경제학회 한국자원경제학회 2003 자원·환경경제연구 Vol.12 No.1

The main purpose of this paper is to estimate environmental preference of advanced countries for water and air pollution. In doing so, we introduce home production. That is, we assume that pollution has not only negative effect on utility but also positive effect on production, Thus if the former is greater that the latter effect, the total effect of pollution is negative. In this paper, we investigated this effect of advanced countries by using GMM estimator. The main finding is that in case of air pollution. This effect is negative. This implies that in case of air pollution, the disutility effect is greater that productivity effect.

적응 등화기에서 데이터-재사용 LMS 알고리즘을 이용한 신호 간섭 제어

김원균,김동국,곽종서,나상동 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2

적응 등화기에서 LMS 알고리즘의 수렴 속도를 개선하기 위한 데이터 재순환 버퍼 구조를 제안한다. 폐기된 수신 데이터를 재활용함으로서 심볼 시간 주기에 적응 등화기의 에러를 이용한 가중치 갱신을 통해 제안된 알고리즘의 수렴특성을 분석하여 수렴 속도가 향상됨을 보인다. 컴퓨터 시뮬레이션 결과를 통해 스텝-크기 매개변수 μ가 증가됨에 따라 알고리즘의 수렴 속도가 상응하게 감소하고 또한, 스텝 크기 매개변수 μ의 증가는 실험적으로 계산된 학습 곡선에서 평균 자승 에러를 감소시키는 효과를 갖는다. 고유치 확산을 감소시킴에 따라 적응 등화기의 수렴속도를 천천히 감소시키고 평균 자승 에러의 안정-상태 값을 증가시키는 효과를 나타낸다. 따라서, 제안된 데이터 재순환 버퍼를 이용한 LMS 알고리즘의 수렴 특성을 개선시키고 계산의 복잡도를 증가시키지 않으면서 수렴속도를 (B+1)배만큼 증가시킨다는 것을 보인다. 컴퓨터 시뮬레이션 결과는 최악의 스텝 크기 매개변수와 고유치 확산 영역에 따른 평균 자승 에러를 분석하고 필터 알고리즘에서 신호간섭제어가 우수함을 입증한다. Data-recycling buffer structure to improve the convergence speed of LMS algorithm in adaptive equalizer is proposed. The improvement of convergence speed is shown by analyzing convergence characteristics of the proposed algorithm through updating weight using the error of adaptive equalizer when coefficients are multiply adapted in a symbol time period. As the step-size parameter μ is increased, the rate of convergence of the algorithm is correspondingly decreased through computer simulation result. Also, increasing the step-size parameter μ has the effect of reducing the variation in the experimentally computed learning curve. Reducing the eigenvalue spread has the effect of slowing down the rate of convergence of the adaptive equalizer and also increasing the steady-state value of the average squared error. Accordingly, the analysis shows that convergence speed can increase by (B+1) times, where B is the number of recycled data, as improving of convergence characteristics using the data-recycling buffer and not increasing complex of computation. The results of the computer simulation demonstrate analyzing mean squared error in accordance with the worst step-size parameter and eigenvalue spread and the superiority of signal interference control in the filter algorithm.

골프선수와 일반인의 등속성 근력에 관한 비교 연구

김종민,박영균,최현희 경희대학교 체육과학연구소 1999 體育學論文集 Vol.27 No.-

The purpose of this study was to compare the isokinetic differences between general people and golfers. The subject of this study were two groups composed each one by 11 young(age 20 to 22) and healthy men (G1) and 11 experienced(5 years) golfers(G2). After the study we conclude as follow. 1.Peak torque and peak torque% of concentric concentration 1)The increment of the maximum flexor power of right velocity difference of 60°/sec was more significant in G1 than in G2 (p〈.01) and the peak torque% difference was more significant in G1 than in G2 (p〈.05). 2)There was not a significant difference in the maximum extensor power and the maximum extensor power per weight. 2.Angle of peak torque 1)The increment of the maximum flexor power of left velocity difference at 60°/sec was more significant in G1 than in G2 (p〈.05). 2)The angle of maximum extensor power did not show an significant difference 3.Peak torque ratio at antagonists between flexor and extensor There was not a significant difference in the peak torque ratio at antagonists between flexor and extensor. 4.Average power and average power% of concentric contraction 1)The Average flexor Power of right and left velocity at 60°/sec showed more significant difference in G1 than in G2 (p〈.01). 2)The average extensor power, the average power of flexor and extensor per weight did not show significant difference. 5.Endurance ratio of concentric contraction The endurance ratio of flexor of right velocity at 240° msec showed more significant difference G1 than in G2(p〈.01) and the endurance ratio of extensor did not show significant difference. 6.Set total work of concentric contraction The set total work of flexor and extensor did not show significant difference.

보육시설장의 리더십 역할이 조직성과에 미치는 영향

김종후,임태균 인제대학교 2009 仁濟論叢 Vol.24 No.1

This research aims to analyze the relationship between the nursery facility principal’s leadership style and the organizational performance. By collecting data from nursery facilities and analyzing them, the followings are found. First, the nursery facility teachers perceived most frequently the facility principals’ leadership styles as pathfinding style, following by empowering, aligning and modeling. Second, although the teachers' perception of the facility principal’s leadership styles did not differ according to the teachers' ages, the teachers’ perception demonstrated significant difference according to the period of employment at the current nursery facility. Third, while the teachers' degree of job satisfaction did not differ among teachers of different age groups, the degree of job satisfaction showed big disparity in accordance with the teachers' period of employment. Fourth, although the teachers' organizational involvement did not differ according to the teachers' ages, the teachers who had been employed for a longer time at the current nursery facilities demonstrated higher levels of organizational involvement. Fifth, the facility principals' leadership styles, the teachers' degree of job satisfaction, and the teacher’s organizational involvement showed a positive correlation(O.68). Sixth, among the different leadership styles of the facility principals, only modeling style was found to affect the teachers' job satisfaction. Seventh, among the leadership styles of the facility principals, modeling style and pathfinding style affected the teachers' organizational involvement.

GPS 측위법을 이용한 차량추종자료 측위방법간 정확성 비교

김도균,이종달,김성훈,정광수,박관 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.2

The purpose of this study is to examine GPS data accuracy on traffic behavior analysis and to investigate GPS measurement in the real road condition. This measurement uses GPS hardware and software for collecting speed and position of two model cars at the same time. Data of Disto meter and GPS data which are bases of GPS data value are compared for judging through t-testing and correlation analysis. GPS data is used for calculating car moving distance and speed change. It is useful to traffic control in a city by analyzing basic traffic behavior appeared on leading car and following car.

Glycyrrhizinic acid에 의해 유발된 Mineralocorticoid Excess Syndrome1례

김태석,양동경,오수용,박동균,김득조,장호열,이종호 대한신장학회 1996 대한신장학회잡지 Vol.15 No.4