豫備考査의 入試反映에 對한 調査硏究

朴載昊,張赫杓,金鶴守 釜山大學校 師範大學 1976 교사교육연구 Vol.3 No.1

This study attempts to seek a way of adequate application of the national preliminary examination to the entrane examination of university. Data of examinations during four years(1973-1976)was collected and corelation between two was analysed. The results of this analysis are as follows; a)the corelation between two examinations is very high. and, thus, the following is strongly recommendable; 1.7 multiples of capacity of student entollments may be primarily selected by means of preliminary examinations and the necesary or instrumental subject for the higher education may be imposed on these chosen applicants. b)dropping precedure in each curriculum is desireble because without this applicants are liable to devote themselves only to their interesting curricula disregarding others not well achieved.

최소분산 프로세서를 사용한 정합장 처리에서 신호단편 수에 따른 바이어스의 영향

박재은,신기철,김재수 韓國海洋大學校 附設 海洋科學技術硏究所 2001 硏究論文集 Vol.10 No.2

적응 정합장처리에서 어레이의 센서 수보다 부족한 신호단편 수로 표본 공분산 행렬을 구성할 경우 행렬 계수의 부족으로 행렬의 역변환에 문제가 발생된다. 이를 해결하기 위해 표본 공분산행렬의 대각성분에 일정한 값을 더하거나 고유분해와 같은 기법을 사용하나, 그 결과로 프로세서 출력에서는 바이어스가 발생된다. 본 논문은 고정음원에서 신호단편의 수에 따른 적응 프로세서 출력의 바이어스와 음원 위치 추정결과를 고찰하기 위해 표본 공분산행렬의 대각성분에 일정한 값을 첨가하는 방법으로 최소분산 기법을 사용하여 수치실험과 실측 자료를 분석하였다. 그 결과 센서 수보다 많은 신호단편을 사용하는 것이 바이어스가 적으며, 음원 위치 추정에서도 좋은 성능을 보였다. When using a sample covariance matrix data in paucity of snapshots, adaptive matched field processing will have problem in inverting covariance matrix due to the rank deficiency. The general solutions are diagonal loading and eigenanalysis methods, but there is a significant bias in the power output. This paper presents a quantitative study of bias of power output and the performance of source localization through the simulation and the measured data analysis in fixed source case using the diagonal loading method for the minimum variance processor. Results show that the bias in power output is reduced and the performance of source localization is improved when the number of snapshots is greater than the number of array sensors.

Ball Mill 분쇄에 對한 硏究

박동기,성일용,엄제현,김익수,김승혁 三陟大學校 1998 論文集 Vol.31 No.1

In the field of study on 'comminution' there appear some kinds of polarizition, i.e. macro-micro, software-hardware and practice-theory and so on. For instance, numerous papers are available on mathematical modelling or simulation of practical ball mill grinding circuits. Few discussion, however, has been made in those papers from the viewpoint of energy consumption on the basis of its quantitative measurement. On the other hand so-called 'fracture of a single particle' phenomena have been investigated exclusively from this point of view in other papers concerned. The authors, therefore, are trying to fill the gap of this type nad conducted so far some experimental work on a laboratory scale ball mill system facilitating precise measurements of torgue.

남·북한 초등학교과정 과학교과서 비교분석 연구 : 물리영역중심으로

박재호,김학수,배옥경 부산대학교 사범대학 과학교육연구소 1996 科學敎育硏究報 Vol.23 No.-

Science textbook in South Korea(5th revised) and North Korea(current) are compared and analysed. The present study shows differences between both science textbooks which may be utilized in future after unification of the two countries. In primary education the south has more than the north in the page number of the textbook. In North Korean educational systems, the idolization of Kim Il-Sung and Kim Jung-Il is apparent. The textbooks of South Korea are made of better materials than those of North Korea. Covers, and illustrations are also of higher quality. Compositions are common in both country's textbooks as they deal with common everyday subjects. South Korean learns science uniformly. However, North Korean takes the unconnected, undeveloped, and ideological pass and also promotes the cramming as a system of education. In scientific terms, North Korea's textbooks show the differences in name, presentation.

정보화사회와 미래의 과학 교육에 대한 고찰

박재호,김학수,이두희 부산대학교 사범대학 과학교육연구소 1996 科學敎育硏究報 Vol.23 No.-

We discuss the concept of imformation society and the middle school science education for the future information society. The discussions can be summarized as the followings ; 1. The information society can be realized by the renovation of informational techniques such as computer and electric communication. And the society will be heavily dependent on the various services, informations, and knowledges. 2. The educational curricula, educational method, and educational contents in the information society will be drastically different from today's and developed into the information-oriented ones.

안동지방 서리현상의 예보가능성에 관한 고찰

정민수,이재균,박광오,이채욱 대구대학교 정보통신연구소 2004 情報通信硏究 Vol.3 No.2

본 연구에서는 서리 발생에 직접적인 영향을 미치는 여러 가지 기후학적인 요소들을 10년 동안 안동지방을 대상 지역으로 선정하고 분석하여 안동지역 서리 발생의 예보 가보 가능성에 관하여 연구하였다. In this paper we analyzed various meteorologicals in Andong during 10 years, so the objective forecast possibility of frost in Andong are examined and analyzed.

달리기 운동 프로그램이 시각장애인의 건강관련 체력에 미치는 영향

이명수,양점홍,홍순미,최재현,박원익,이창준 釜山大學校 附設 體育科學硏究所 2004 體育科學硏究所 論文集 Vol.20 No.-

The purpose of this study was to find out the effect of jogging(LSD ; Long Slow Distance) and walking training on health-related fitness of the blind.....

기하광학영역에서의 능동소나 표적신호합성

신기철,박재은,김재수,최상문,김우식 한국해양대학교 해양과학기술연구소 2001 硏究論文集 Vol.10 No.1

능동소나 시스템에서 표적신호의 근거리 정보가 중요해짐에 따라, 표적 음향산란 신호의 고유한특성을 분석하기 위해 실험적인 방법과 시뮬레이션 기법이 사용된다. 본 논문에서는 표적신호 합성을 위해 축소표적 반향실험을 수행하였고, 자료의 분석 결과 축소표적의 음향산란은 거울면 반사의 영향이 큰 것으로 분석되어, 표적신호 합성에서 기하광학이론을 응용하였다. 복잡한 형태의 표적을 여러 표본형상으로 분리하고, 각 표본형상의 기여도를 신호의 위상과 강도를 줌으로써 계산하였으며. 표적신호 합성모델의 검증을 위해 실제 축소표적 실험 결과와 비교하였다. 혁심용어: 기하광학이론. 음향산란, 거울면반사. 축소표적, 능동소나 투고분야: 수중음향 분야 (5.2) Since the near field iformation of target signal is important in the development and verification of active sonar system experimental method and simulation technique are widely used in order to analyze the detail characteristics of target scattered echoes. Therefore, in this paper, the scale target experiment is performed to develope and improve the target signal simulation model. Since the experimental results show that the specular reflection is the major component among scattering mechanisms, the target signal simulation model based on the Geometric Optics Theory (GOT) is developed. Complex target is separated into simple shapes, known as canonical shape. The contribution from individual canonical shapes are summed with proper phase and amplitude to produse the target strength of the whole complex body. Simulated target signal is compared with the experimental results fed discussed.

일관성 광대역 정합장처리에 의한 수중 이동음원의 위치추적

신기철,박재은,김재수 韓國海洋大學校 附設 海洋科學技術硏究所 2002 硏究論文集 Vol.11 No.2

최근 수중음향에 대한 관심은 천해와 같은 복잡한 음파의 상호작용과 경계조건이 부정확한 해양환경으로 이동하고 있다. 천해 음향전파에 의해서 발생하는 어려움을 극복하기 위한 방법으로 음원의 광대역 스펙트럼에서 얻어지는 정보를 사용하여 견고성과 신뢰성을 증가시키는 광대역 정합장처리 기법이 사용된다. 본 논문에서는 협대역에서의 음장의 공간 일관성을 확장하여 다중 주파수를 사용한 주파수-공간 일관성 광대역 프로세서를 제안하였고, 이 프로세서를 실제 광대역 이동음원에 적용하여 음원위치추적을 수행하였다. 제안된 일관성 프로세서는 음원의 정위치 추정확률이 높았으며, 특히 정합장출력의 부엽준위에서 비일관성 프로세서와 비교해 일관성 프로세서가 상당히 낮은 준위를 나타내었다. The shallow-water environment presents additional challenges arising from the complex interaction patterns of the sound with the sea bed. In order to overcome the difficulties generated by shallow-water propagation, broad-band matched field processing has been employed in an effort to increase robustness by utilizing multiple frequency information. In this paper, a coherent broad-band matched field processor is introduced that incorporates the spatial coherence of the acoustic field not only over one frequency but across frequencies. The incoherent and coherent processors are applied to the experimental data where it is shown that both processors give a high probability of correct localization. Also it is found that a coherent processor has better performance in the sidelobe pattern of ambiguity surfaces.

남성소비자들의 상표충성도와 쾌락적ㆍ효용적 의복가치

서문숙;김건수;박재옥;이규혜 한양대학교 2007 韓國 生活 科學 硏究 Vol.27 No.1

Many recent research reported that men, different from the past, want to represent their individualities through clothing and become important shoppers. The market for men is gradually extended. In this study, a well known relationship between clothing values and brand orientation were tested for male consumers. Data from 334 adult male consumers living in a metropolitan area were collected and analyzed. Results indicated that male consumers with various demographic characteristics such as age, marital status, income, and clothing expense showed different level of clothing values. Regression analysis results indicated that among hedonic clothing value factors, confidence in clothing and fashion orientation had significant influence on brand loyalty. Among utilitarian factors symbolic values expressed through clothing had a strong influence on brand loyalty of male consumers.