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- 저자 : 김성량 (검색결과 4 건)
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위상천이 디지털 홀로그래피를 이용한 이중 광 암호화 전송 및 복호화
We propose a new data and key encryption and transmission technique based on phase-shifting digital holography for a security system. In this thesis, a dual encryption method of a binary data and a security key is presented by using 4-step or 2-step phase-shifting digital holography. This technique complicates optical encryption and makes it harder to break the information due to more complicated cypher method. Phase-shifting digital holography is used for recording phase and amplitude information on CCD device. For example, 2-step phase-shifting digital holograms are acquired by moving the PZT mirror with phase step of 0 or π/2 in the reference beam path and are recorded on CCD camera. Digital hologram in this method is Fourier transform hologram and digitized with 256 gray-level. The information data and the key are expressed with random binary amplitude and random phase and are expressed by binary random code with 128×128 pixels. The information data and the key are converted to random phase patterns. In order to get good digital hologram on spatial frequency domain(CCD), random phase is used for both object and reference beams which enables to widen the dynamic range of spatial frequency and expands high frequency components. In the 2-step phase-shifting digital holography, DC-term removal is essential to reconstruct and decrypt original binary data information. 2-step technique reduces the number of interferograms in the phase-shifting digital holography and the technique using 2-step phase-shift digital holography is more efficient than 4-step phase-shift digital holographic system because 2-step phase-shift digital holographyic system uses less data than 4-step method for data transmission. K-ratio which is expressed in the ratio of the object wave to the reference wave intensity have to be controlled properly in order to get a good interference pattern. The decrypted data is affected by K-ratio. Computer simulations show that the 256 gray level data is optimally decrypted according to K-ratio in the proposed optical security system. The magnitude of signal bits is about 1, but the magnitude of the noise bits is below about 0.4 for the binary data in the security system only using public key and plane wave as reference beam. And the magnitude of signal bits is about 1, but the magnitude of the noise bits is below about 0.2 for the binary image in the same security system. In the meanwhile, the magnitude of signal bits is about 1, but the magnitude of the noise bits is below about 0.03 for the binary data in the security system using dual public key and private key. And the magnitude of signal bits is about 1, but the magnitude of the noise bits is below about 0.03 for the binary image in the same dual security system. The computer simulations show that the proposed method gives good results for cipher system and show that the proposed technique can be used for binary data encryption and decryption. The encrypted binary data/image in the form of digital hologram can be transmitted through communication network, and is reconstructed and decrypted digitally.
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본 연구는 태권도선수들의 전자호구 사용 만족도를 알아보는데 목적이 있다. 이와 같은 연구 목적을 달성하기 위하여 2009년 12월 12일부터 14일까지 전북 김제에서 K사의 전자호구가 사용된 전국남여우수선수선발태권도대회 겸 2010년도 국가대표선수선발예선대회에 출전한 360명의 태권도선수들을 대상자로 선정하여 사용만족도 검사를 실시하였다. 이렇게 수집된 설문지를 토대로 Window용 SPSS/PC+ 12.0 Version 통계프로그램을 이용하여 개인특성에 따른 빈도분석(Frequencies), t-검증(independent-samples t test), 일원변량분석(one-way ANOVA) 및 Duncan의 다중비교검증을 실시하여 분석하였다. 자료분석의 모든 통계치의 유의수준은 P<.05로 설정하였으며, 이상의 방법과 절차를 통하여 얻어진 결론은 다음과 같다. 태권도선수들의 개인적 특성에 따른 전자호구 사용 만족도 차이에서, 성별에 따라 디자인 만족도, 기능성 만족도, 편의성 만족도에는 유의한 차이가 없었다. 나이에 따른 만족도에서는 기능성 만족도에는 유의한 차이가 있었으며, 디자인 만족도, 편의성 만족도에서는 유의한 차이가 없었다. 체급에 따라 기능성 만족도는 유의한 차이가 있었고, 디자인 만족도, 편의성 만족도에서는 유의한 차이가 없었다. 선수경력에 따라 디자인 만족도는 유의한 차이가 있었고, 기능성 만족도, 편의성 만족도는 유의한 차이가 없었다. 입상경력에 따라 디자인 만족도는 유의한 차이가 있었지만, 기능성 만족도, 편의성 만족에서는 유의한 차이가 없었다. The purpose of this study is to investigate taekwondo players' satisfaction with use of electronic body protectors. For this purpose, a survey was conducted with 360 taekwondo players who took part in the 2010 preliminary national player selection match, or the national male and female good taekwondo player selection match using electronic body protectors manufactured by Company K in Gimje, North Jeolla Province from December 12 to 14, 2009. For the collected questionnaires, frequency analysis independent-sample t-test, one-way ANOA, and Duncan's multiple range test were carried out by using an SPSS/PC+ 12.0 Version statistical program for Window. The significance level for all statistics in data analyses was set at P<.05; from these methods and procedures, the following conclusions were drawn. As for differences in satisfaction with use of electronic body protectors by taekwondo players' personal characteristics, there was no significant difference in design, functionality, or convenience satisfaction by gender. There were significant differences in functionality satisfaction, but there was no significant difference in design or convenience satisfaction, by age. There were significant differences in functionality satisfaction, but there was no significant difference in design or convenience satisfaction, by physical grades. There were significant differences in design satisfaction, but there was no significant difference in functionality or convenience satisfaction, by career. There were significant differences in design satisfaction, but there was no significant difference in functionality or convenience satisfaction, by prize-winning career.
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김성량 광주대학교 언론홍보대학원 2000 국내석사
Internet home pages of univesity dental hospitals in Korea often tend to increase displeasure of the users owing to poor systematic network operation and management, and, in fact, they do not work as effective hospital pr media with little understanding as pr media. For this study, research was done on real states of internet home pages of 11 university dental hospitals in Korea as of the end of April 2001, and here some objective models are suggested for establishment and improvement of university dental hospital hompages in this study by analyzing the data and comparing them each other. This study also attempts to suggest some good measures for effective hospital PR. In conclusion, results of this study is summarized as the following: First, above all, it should be considered in establishment and improvement of home pages that the management of these pages is more important than establishment of them. Secondly, these home pages may well be utilized as media for hospital marketing. Thirdly, principles and directions of medical consultaion on internet home pages should be prepared.
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