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이유형,김도형,류주현,김인성,송재성,홍재일,Lee, Yu-Hyung,Kim, Do-Hyung,Yoo, Ju-Hyun,Kim, In-Sung,Song, Jae-Sung,Hong, Jae-Il 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.6
In this study, In order to improve dielectric and piezoelectric properties of Lead-free piezoelectric ceramics, $0.95(K_{0.5}Na_{0.5})NbO_3-0.05Li(Sb_{0.8}Nb_{0.2})O_3+0.2\;wt%Ag_2O+0.4\;wt%MnO_2+Xwt%CuO$ were investigated as a function of the amount of CuO addition. With increasing the amount of CuO addition, density was increased up to 0.4 wt.% CuO and then decreased above. And also, electro mechanical coupling factor ($k_p$) was decreased. At the 0.4 wt% CuO added specimen sintered at $1020^{\circ}C$, $k_p$, Qm, density, dielectric constant (${\varepsilon}_r$) and $d_{33}$[pC/N] showed the optimal value of $4.37\;g/cm^3$, 0.354, 305, 645, and 144 pC/N respectively.
노인들의 자아존중감과 신체매력인지에 따른 외모관리 행동에 관한 연구
이유종 ( Yoo Jong Lee ),서부일 ( Bu Il Seo ) 한국보건복지융합학회 2010 노인의료복지연구 Vol.2 No.2
This research analyzed the factors causing the aged to care their appearances based according to their self esteem and perception of physical attraction in order to help the old with their appearances caring since they need better supports for the caring and perception of physical attraction in this quickest aging society. 3 colleges for the aged located in Daegu were randomly chosen and 600 male/female students attending the colleges who are older than 65 were surveyed from 1st June, 2009 to 1st Sep for 3 months. The researcher explained the object and goal of the research and had the students fill out the questionnaires. Then 595 copies out of 600 were answered properly and the results are summed as followings. 1) Married female students who live alone as a housewife having a religion with poor educational background had the highest interest in managing their appearances. The students also caring their hair, weights, dresses tell us that they are mentally and economically unstable so that they try harder to show better images of them to others than the other old women who live with their husband. 2) Overall appearance management takes up 24.4 % and the value F has a statistical significance as its value being 27.129. Sex(b=0.417) and having/ not having a religion(b=0.173) were the factors affecting them to care their appearances. Females with a religion turned out to care more about their appearances. 3) They cared about their face the most then their hair style, dresses, shape, social physical attraction, personal physical attraction, and self esteem when I looked at the correlation between variables for caring their appearances. The factors that made them to care their face and shape were social and personal physical attraction, self esteem whereas social physical attraction, self esteem, then personal physical attraction were the factors made them to care their hair style and dresses in order.
이유원(Yoo-Won LEE),신형일(Hyeong-Il SHIN),서두옥(Du-Ok SEO),김병엽(Byung-Yob KIM) 한국수산해양교육학회 2008 水産海洋敎育硏究 Vol.20 No.1
This study presents the results of basic sighting surveys conducted for dolphin watching from 2004 to 2006 in the northeastern waters of Jeju. The sighting probability of dolphins (bottlenose dolphin, Tursiops truncatus) was 71.9% (82 sightings out of 114 surveys). The dolphin's attractive behaviors observed included leaping, tail or peduncle slapping andsurfing. The findings of this study provide useful baseline data for dolphin watching in the northeastern waters of Jeju.