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재구성영상 형성방법에 따른 디지털영상공제술의 정확성 비교연구
허영준,전인성,허민석,이삼선,최순철,박태원,김종대,Huh Young-June,Jeon In-Seong,Heo Min-Suk,Lee Sam-Sun,Choi Soon-Chul,Park Tae-Won,Kim Jong-Dae 대한영상치의학회 2002 Imaging Science in Dentistry Vol.32 No.2
Purpose : To compare the accuracy of digital subtraction images acquired by two different methods different in positioning four reference points for geometrical standardization. Materials and Methods : A total of 36 digital radiographic images of 6 volunteers were taken at the areas of the incisor, premolar, and molar of both the maxilla and mandible using the Digora system. Each image was moved 4 mm vertically and horizontally. Four oral and maxillofacial radiologists performed digital subtraction radiography between the paired images before and after movement using Emago (Oral Diagnostic Systems, Amsterdam, The Netherlands) and Sunny (Biomedisys Co., Seoul, Korea). The standard deviation of the internal gray value in Region of Interest (ROI) was statistically analyzed between the two programs using the paired t-test. Results : The standard deviation of pixel gray values from the digital subtraction images using the Sunny program were lower than that of the Emago program (p<0.05). All observers showed significant differences between each other when the Sunny program was used (p<0.05), but one observer showed a significantly higher score than other observers when they used Emago (p<0.05). The standard deviations of premolar area from both Sunny and Emago programs were significantly higher than those of anterior and molar regions (p<0.05). Conclusion: The subtracted images using the Sunny program were more accurate and sensitive than those taken using the Emago program.
모듈러 곱셈을 위한 선형 시스톨릭 어레이 설계 및 분석
허영준(Young-Jun Heo),김현철(Hyun-Chui Kim),이건직(Keon-Jik Lee),유기영(Kee-Young Yoo) 한국정보과학회 1997 정보과학회논문지 : 시스템 및 이론 Vol.24 No.11
RSA와 같은 공개키 암호시스템(public-key cryptography system)에서는 512 비트 또는 그 이상의 큰 수의 모듈러 곱셈 연산을 수행하여야 한다. 본 논문에서는 Montgomery 알고리즘을 이용하여 모듈러 곱셈을 수행하는 최적의 문제-크기 선형 시스톨릭 어레이를 설계한다. LPGS(locally parallel globally sequential) 분할방법을 이용하여 문제-크기 선형 시스톨릭 어레이와 동일한 연산을 수행하는 임의의 고정-크기 선형 시스톨릭 어레이를 설계하고 분석한다. 설계된 시스톨릭 어레이는 VLSI칩과 같은 하드웨어로 구현함으로써 IC 카드나 smart 카드 등에 이용될 수 있을 것이다. The public-key cryptographic system, such as RSA, requires fast modular multiplication of numbers containing 512 or more bits. In this paper, we derive the optimal problem-size linear systolic array for performing modular multiplication using Montgomery's algorithm. And, we analyze and design fixed-size systolic arrays of the arbitrary size for performing operations equivalent to problem-size systolic array by using LPGS(locally parallel globally sequential) partition method. The systolic array presented in this paper could be designed on VLSI hardware and used in IC and smart card.