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李丁柱,金仁湖,姜光鏞,張敏守 慶尙大學校 기초과학연구소 1988 基礎科學硏究所報 Vol.4 No.-
Bi_2(M_0O_4)_3 single crystal was grown by Czochralski technique. From the UV-VIS spectrum and the IR spectra Bi_2(M_0O_4)_3crystal was turned out having a indirect absorption process with energy gap, 2.8eV and having complicate absorption edge with maximum value in vicinity of 1860cm^-1. According to the crystallographic point group(2/m) and monoclinic system,Bi_2(M_0O_4)_3 crystal has two Raman active modes(Ag, Bg mode). Thus, the evolution of Raman spectra with temperature corresponding to selected experimental configuration-x(zz)y (Ag-mode), x(yx)y(Bg-mode)-was observed. From photoluminescence experiment, a violet-fluorescent light was observed. But we had a difficulty in analyzing the broad -spectra detected actually.
李貞株 광주대학교 1985 광주개방대학 논문집 Vol.2 No.-
In this paper, I investigate the art of Miro, who is a great modern painter, and his influence on the 20c painting. Miro once had participated in Surrealism. His art contributed to the abstract painting as well as the concrete painting. By distorting, simplifying and transforming forms he tried to find innocence, which most of the paintings lacked in those days. His works give us fantastic and symbolic mood by forms and symbols. The free colors, pictures and automatic lines composes the works which win the sympathy of people. In addition, his investigation on unconsciousness, subconsciousness and psychoanalysis had an important influence on the world of painting.
정밀도가 높은 위치 측정 시스템의 환경 데이터베이스를 이용한 위치 보정 알고리즘
이정주,강동조,박현주,Lee, Jeong-Joo,Kang, Dong-Jo,Park, Hyun-Ju 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.8
최근 유비쿼터스라는 시대적 흐름에 따라 실내환경을 고려한 응용서비스들에 대한 요구가 증가 하고 있다. 실내 위치기반 서비스의 경우 가장 많이 사용 되고 있는 방법은 WLAN을 이용한 방법이다. 그러나 WLAN는 환경변화에 많은 영향을 받는다. 이러한 문제점을 해결하기 위해서 UWB를 이용한 연구가 많이 진행 되고 있다. UWB에 관한 연구가 많이 진행 되는 이유는 UWB전파 특성으로 환경변화에 적은 영향을 받기 때문이다. 그래서 본 논문은 UWB기술을 이용한 시스템인 Ubisense 시스템을 이용하여 환경변화에 영향이 적고 정밀도가 높은 값을 추출한 후 위치정보를 더 정확한 값으로 보정하는 위치 보정 알고리즘을 제안한다. 제안하는 위치 보정 알고리즘은 정밀도가 높은 위치 측정 시스템에서 더욱 정확한 위치를 추정하기 위해 환경 데이터베이스를 구축한 후 이를 이용한 알고리즘이다. Recently, demands of application services in consideration of interior environment according to the stream of times, Ubiquitous. In case of interior location-based service, WLAN is now mostly used. But it is largely affected by environmental changes. To solve this problem, lots of studies on UWB are underway. The reason why studies on UWB are much made lies in that it is not much affected by environment changes owing to radio wave characteristics. So this study suggests the location correction algorithm which derives values with less influence of environment and high accuracy and corrects with more accurate location information using Ubisense system based on UWB technologies. The location correction algorithm suggested is one made after constructing environment database and use it to estimate more accurate location from the location measuring system in a high position.
고주파 방전을 이용한 세라믹 연면방전체 개발의 기초연구
이정주 龍仁大學校 1997 용인대학교 논문집 Vol.14 No.-
This study was performed to evalute electric and environmental characteristics of surface discharge induced plasma chemical process(SPCP) element. The effects of initial and restricted discharge voltage could be analyzed through the investigation of discharge charateristics of SPCP by the observation of the reaction concentration or ozone reaction temperature. The characteristics arising from environmental change could be observed and it should be noticed that temperature, humidity, pressure and residence time have effects on the reaction products which were created in plasma processing. In this experiment, it was observed that ozone concentration increased while the temperature and humidity decreased, but the reaction product of NOx decreased for lower temperature and humidity. Keeping residence time longer caused ozone to be concentrated more densly and reaction temperature to decrease which is same on the surface of SPCP element.