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이건일 國防大學校 2003 敎授論叢 Vol.30 No.-
오랜 역사와 문화적 전통을 가진 국가일수록 전통적 정치문화로 인해 현대화 과정에서 겪게되는 제약성은 상대적으로 강하게 나타난다. 중국의 경우, 적어도 2천여 년 동안 지속되어 온 소농경제의 하부구조와 관료제도 및 종법윤리는 전통중국의 정치문화를 생성시킨 기본요인으로서 뿐만 아니라 현대적 정치문화의 출현을 제약하는 장애요인으로 작용하고 있다. 사회주의 중국의 정치문화는 봉건주의의 전통적 요소, 계획경제시기의 마르크스주의적 요소, 그리고 개혁개방 이후 시장경제가 심화되면서 나타나고 있는 자본주의적 요소로 구성되어 있다. 이와 같이 이질적 요소로 구성된 정치문화의 복합성은 선진적 정치문화의 형성을 제약하는 구조적 요인으로 작용하고 있으며, 중국의 정치문화를 이해하는데 있어서 전통적 정치문화의 유산이 지니게 되는 중요성을 소홀히 취급할 수 없도록 만들고 있다.
이건일,진연화,Lee Keon-Il,Jin Yeun-Hwa 대한영상치의학회 1997 Imaging Science in Dentistry Vol.27 No.2
This study was performed to demonstrate the effect of linear or nonlinear contrast enhancement on subtraction images. Three different textures were radiograped on dental film. The first radiograph was taken without the presence of an object. the second, which showed trabucular bone, was taken of the molar area of a human. the third radiograph was taken of the coronal part of molars. Each film was digitized into a 1312 x 1024 pixel x 8 bit depth matrix by means of a Nikon 35 mm film scanner(LS-3510AF, Japan) with fixed gain and internal dark current correction to maintain constant illumination. The scanner was interfaced to a Macintosh Le ill computer(Apple Computer, Charlotte, N.C) This resulted in three pairs of images, including different textures-plain, bone and enamel. Digital regular, linearly and nonlinearly enhanced subtraction was performed. Computer software was ,used to simulate lesions in the shape of a 2D-Gaussian curve on each of a pair of images. The each subtraction images were presented in a random sequence to two groups of 10 observers(students and dentists). ROC analysis was used to compare observer performance. The following results were obtained ; 1. All of LCE subtraction, equalized subtraction and regular subtraction images of plain texture were diagnosed the best by far. 2. The data revealed a siginificant LCE effect in both the student group and the expert group. 3. Clinical expertise was a helphul factor for the observers in this study.
인간 시각 체계를 이용한 BTC-ADRC 복합 적응 영상 압축
이건일,이봉락,신용달 경북대학교 전자기술연구소 1993 電子技術硏究誌 Vol.14 No.1
A BTC-ADRC hybrid coding method to remove the problems of conventional adaptive BTC and adaptive dynamic range coding is proposed. A determination of the quantization level was reference to deviation. of the blocks and the human visual system characteristic. A low activity areas aid medium activity areas ate 1-level and 2-level quantizer respectively, A high activity areas are, 4 level quantizer using adaptive dynamic range coding. So it can remove the local minimum problem of the conventional BTC and improve degradation of the adaptive dynamic range coding, and reduce a computation load of the hybrid adaptive dynamic range coding. By results of simulation with CCIR standard images, the PSNR and subjected quality of reconstructed images of the proposed method was superior to those of the conventional adaptive BTC.