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김장환 국민대학교 한국학연구소 2010 한국학논총 Vol.33 No.-
This study has reconfirmed the previous researches about Han-jae(寒齋) Yi Mock(李穆 (1471-1498) who wrote the first book of tea, 「Da-bu」. Humanistic historical research based on literature is necessary to succeed to and develop the culture. Thus, the establishment of humanism should precede his life and his book, 「Da-bu」. However, the previous researches have made errors by reckoning without the principles. Therefore, this study has reconfirmed the errors of previous researches and corrected the life of Han-jae Yi Mock newly examined and establish the righteous tea culture. 본 연구는 국내 최초 茶書라 할 수 있는 「茶賦」의 저자 寒齋(1471~1498)에 대한 선행연구 자료들을 재확인하였다, 한 문화가 繼承 발전하는 데는 文獻을 기조로 하는 人文學的 考證을 필요로 한다. 그러므로 한재 이목의 생애 또는 그의 작품 「茶賦」 역시 인문학의 정립이 우선되어야 할 것이다. 그러나 선행연구 자료들은 원론적 이론을 看過함으로서 오류를 낳고 말았다. 이에 본 연구는 선행연구 자료들의 오류를 재확인함으로서 그 동안 잘 못 알려진 한재 이목의 生涯을 다음과 같이 조명함으로서 올바른 차문화 정립에 기여하고자 하였다.
랜덤시퀀스와 Hadamard 행렬을 이용한 디지털 정보은폐 기술에 관한 연구
김장환,김규태,김은수 한국통신학회 1999 韓國通信學會論文誌 Vol.24 No.9
본 논문에서는 랜덤시퀀스와 Hadamard 행렬을 이용하여 다중 정보를 은폐시킬 수 있는 새로운 디지털 제안하였다. 기존의 디지털 정보은폐에 사용된 기법은 하나의 랜덤시퀀스를 정보신호에 직접 곱하여 정보신호에 에너지 레벨을 매우 낮춤으로서 불법 이용자로 하여금 은폐된 정보의 검출이나 교란을 어렵게 하였다. 그러나 여러 개의 정보를 동일한 디지털 영상에 은폐시킬 경우에는 직교성이 보장되는 은폐코드를 사용해야 하기 때문에 어느 정도 상관성을 갖는 랜덤시퀀스만으로는 정보은폐가 어렵다. 따라서, 본 논문에서는 랜덤시퀀스의 장점과 더불어 직교성을 갖을 수 있도록 같은 행렬을 곱할 때만 정확한 신호로 추출되는 Hadamard 행렬을 랜덤시퀀스와 함께 사용하여 다수의 은폐정보에 대해서도 정확하게 은폐된 신호를 추출할 수 있는 새로운 디지털 정보은폐 방법을 제안하였다. In this paper we propose the digital information hiding technique by which we use the combination of random sequence and Hadamard matrix to hide multiple information. The prior work used only one random sequence multiplied by information signal to lower the energy level of information signal and thus it is difficult for a third party to detect the information signal or jam it. But because we have to use the orthogonal code for hiding key in order to hide multiple information in the same digital image, only the use of random sequence that are not uncorrelated has some problems in the information hiding scheme. Thus we present a new information hiding scheme that can be used in hiding multiple information by the use of random sequence that spreads the energy level of the data to be hidden and Hadamard matrix that makes the random sequence uncorrelated.
김장환,홍준선,박진기 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.4
This study aims to determine the impact of the Leadership style of a golf instructor on the Effectiveness of gold instruction and to help instructors put productive instruction methods into practice. To accomplish the goals of the study, golfers who held membership in private golf ranges in Daegu were sampled, The Systematic Stratified Cluster Random Sampling was adopted to choose 300 members, 50 each from six golf ranges, A questionnaire was distributed to the sampled golfers at each golf range after they were given a brief explanation about the purpose and contents of the survey as well as about what they should keep in mind in answering the questions, The golfers were asked to answer those questions using the self-administration method, Of the 300 responses returned, 279 valid answers (93%) were used for the study after excluding some incomplete or inadequate ones. With the SPSS 11.0 package program, general characteristics of the golfers were analyzed using Frequency Analysis, Multiple Regression Analysis was employed to learn the impact of the leadership style of a golf instructor on the effectiveness of gold instruction, The results of the research conducted with the research methods and data analysis described above are as follows: Firstly, the leadership style of the golf instructors proved to have a significant impact on golfers' perceived satisfaction with the provided instruction, Specifically, among various instructional attitudes, Training & instructive Behavior had the most influence. instructor's Positive Feedback Behavior, Democratic Behavior, and Social Support Behavior also had some significant impact. Secondly, the leadership style of the golf instructors turned out to have a significant impact on golfers' perceived performance improvement, dice again, Training & instructive Behavior were the most important factors, while Positive Feedback Behavior and Social Support Behavior also had significant influence. Thirdly, the leadership style of the golf instructors had significant effect on the overall improvement of the golfers' average scores, Training & instructive Behavior contributed to enhancing golfers' performance most, while Social Support Behavior of an instructor also played a significant role. Keeping in mind the above research results, this study concludes that Training & instructive Behavior is the most effective and desirable leadership style of an instructor in terms of boosting golfers' perceived satisfaction, promoting their perceived performance improvement, and increasing their golf scores, in addition, this study suggests that the Autocratic Behavior of a golf instructor has no significant impact on enhancing the effectiveness of golf instruction thus instructors should refrain from behaving in an authoritarian way.