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고도각 주사 위상 배열 레이다에서 정확한 최적 기움각 매김
이민준,박정순,송익호,이주식,김석찬,Lee, Min-Joon,Park, Jeong-Soon,Song, Iick-Ho,Lee, Joo-Shik,Kim, Suk-Chan 한국통신학회 1998 韓國通信學會論文誌 Vol.23 No.6
고도각 주사 위상배열안테나에서 감지기 수는 안테나의 가격과 무게를 낮추는 중요한 요소 가운데 하나이다. 따라서, 배열요소 사이 거리와 관계가 있는 안테나 기움각은 매우 중요한 설계 매개변수이다. 이 논문에서는 몇몇 균일 배열안테나와 비균일 배열안테나에 대한 정확한 최적 기움각을 이론적으로 얻어 본다. 네 가지 균일 선형 배열안테나를 생각하고 비균일 여기 배열안테나로는 체비셰프 배열요소를 생각한다. In phased array antennas that scan elevation, the number of radiator rows is one of the important factors to minimizing both cost and weitht. Therefore, the antenna tilt angles having relation with element spacing are among the improtant design parameters. The exact optimum tilt angles for several types of uniformly and nonuniformly excited arrays are obtained theoretically. Four types of uniform linear arrays and Chebyshev array factors as a nonuniformly excited arrav are considered.
여성의 커피와 다류의 섭취에 영향을 주는 요인에 관한 연구
이민준,손경희,민성희,이현주 한국식생활문화학회 2000 韓國食生活文化學會誌 Vol.15 No.5
The purposes of this study are : (a) to investigate the attitude to various coffee and tea of women, (b) to analyze the characteristics of each classified group according to eating frequency, and (c) to abstract the factors which can influence the consumption of coffee and tea. Questionnaires were hand delivered to 1,200 women residing in Seoul. A total of 1012 was usable: resulting in 84% response rate. Statistical data analysis was completed using SAS Package program for the one way-analysis of variance(ANOVA), Duncan's multiple comparison test, factor analysis and analysis of covariance (ANOCOVA). (a) Instant coffee was most consumed(22.1 times a month), green tea in tea bag(8.7), Donggulre tea(8.3), Coffee (7.2) in order of frequency. Among Korean traditional tea Donggulre tea(8.3) and Yuja tea (2.0) were most prefered but still a minute quantity of Korean traditional tea was enjoyed. (b) Coffee and Black tea was regarded unhealthful but habitual, delicious and familiar beverage. Green tea was regarded good for health but not so habitual, practical and familiar. The consumer awareness can be grouped into 3 clases : Healthy factor, Habitual·Practical factor, Familiar factor. (c) The sociodemographic characteristics of women influenced the beverage consumption. Women in their 30s and 40s consumed much of instant coffee and coffee. 10s and 20s consumed much of canned coffee. Working women drank much of instant coffee and green tea in tea bag. Women in highest income group(≥4,000,000 won/month) consumed much of coffee. (d) The factors which influenced the eating frequency of those beverages were various. The eating frequency of instant coffee was influenced by the age, familiar factor and habitual·practical factor. And coffee were influenced by income level, habitual·practical factor. The frequency of green tea in tea bag was influenced by habitual·practical factor and familiar factor, green tea was influenced by healthy factor and habitual·practical factor, Donggulre tea was influenced by habitual·practical factor.
이민준,김승각 대한전자공학회 2004 電子工學會論文誌-TC (Telecommunications) Vol.41 No.2
The beam direction of the 3-D phase array ship-borne radar is changed according to ship motion such as a pitch and roll variation. To align beam direction, under this circumstance, mechanical or electronic stabilization should be adopted. Considering weight and volume of radar, method of electronic stabilization is recommended. In this paper, method of electronic stabilization is proposed and the results are shown by computer simulation. 함정의 피치 및 롤의 변화에 따라 탑재된 3차원 위상배열 레이다의 빔조향 방향이 변화하게 된다. 이와 같은 환경에서 빔을 원하는 방향으로 조향하기 위해서 기계적인 안정화 장치나 전자빔 보상 방법을 사용할 수 있다. 레이다의 무게나 부피등의 측면을 고려하면 전자빔 보상 방법이 장점이 있다. 이 논문에서는 전자빔 보상방법을 제안하고 시뮬레이션을 통해 결과를 제시하였다.
식이 섬유소가 체내 영양소의 소화, 흡수에 미치는 영향
이민준 연세대학교 생활과학대학 1985 婦學 Vol.18 No.-
During the past few years there has been a revival of interest in the fiber content of foods and the effects of its intake on man. The studies concerning the physiologic effects on dietary fibers and their clinical applicants are summarized as follows: The number of defecations and fecal weight increased with fiber. Mean bowel transit time was not always affected by the inclusion of fiber in the diet. Nitrogen and fat fecal excretions increased and apparent digestibilities decreased as fiber intake increased. The property of fiber to act as a cation exchange resin could also result in some undesirable effects, that is, mineral absorption appears to be decreased by increased fiber intake. Decreased absorption of the nutrients may not be problem when the intakes of dietary protein, fat, minerals are sufficiently high, or excess, but may be of concern in underdeveloped countries where the consumption of these nutrients is relatively low. On the other hand, a low fiber intake has been reported to be associated with ischemic heart disease, diabetes, diverticular disease of the colon, cancer of the colon. So, in the western countries where the fiber intake is relatively low, those disease incidence is much higher than in the underdeveloped countries where the fiber intake is relatively high. More research is needed to test the validity of the mechanisms about the effects of dietary fiber on the nutrients digestion absorption and many disease. And intensive investigation is needed to establish a sound basis for recommendation.