Encryption and decryption system using bio-information and phase wrapping method

In this paper, we propose an improved image encryption and fault-tolerance decryption method using bio-information and phase wrapping method in the frequency domain. An encrypted image in the encryption process is denoted the product of a phase-encoded arbitrary image and a random phase image. The encrypted image is zero-padded and Fourier transformed. Its real-valued data and bio-information image are phase-encoded. Both encrypted key and decrypting key are made of proposed phase wrapping method. The decryption is simply performed based on 2-f setup with spatial filter by Fourier transform for multiplication phase-encoded fingerprint image and the keys. The proposed method using arbitrary image, which does not contain any information from the original image, prevents the possibility of counterfeiting from unauthorized people and also can be used as a current spatial light modulator technology by phase encoding of the real-valued data. Computer simulations show the validity of the encryption scheme and the robustness to noise of the encrypted key or the decryption key in the proposed technique.제 1 장 서론 = 1 제 2 장 결합 변환 상관기와 이중 랜덤 위상 암호화 = 4 2.1 전통적인 결합 변환 상관기 = 4 2.2 결합 변환 상관기를 이용한 암호화 시스템 = 7 2.3 이중 랜덤 위상 암호화 = 11 제 3 장 제안한 암호화 및 복호화 방법 = 15 3.1 암호화 방법 = 16 3.2 복호화 방법 = 20 제 4 장 실험 및 고찰 = 26 4.1 실험 = 26 4.2 암호화된 영상의 손실에 대한 고찰 = 30 제 5 장 결론 = 3

Study of Implementation of Simulation for Subsea Production System

The purpose of this study is implementation of the simulation for subsea production system. Subsea production system is installed under the environment of high pressure and low temperature. Most of processes of production are proceeded in the subsea equipments. Therefore, the understanding and study of subsea production system is very difficult because people cannot observe the process directly. The simulation system can be a solution for this difficulty. In this research the information models and 3-D graphic model for the subsea equipments were built using the object-oriented technology and 3-D CAD. The entire system was implemented with help of simulation software, 3-DVIA Virtools. The simulation system of subsea production system was tested with several scenarios of production process. The test results showed that the simulation system is very useful for the understanding of subsea production system and can be a good education tool.제1장 서론 1 1.1 연구배경 1 1.2 연구 목표 2 제2장 심해 석유 생산 시스템 3 2.1 심해 석유 생산의 과정 3 2.2 심해 석유 생산 시스템의 주요 구성품과 역할 4 제3장 객체지향 정보 모델링 10 3.1 객체지향 모델링 기법 (OMT : Object Modeling Technique) 10 3.2 객체와 클래스 13 3.3 UML(Unified Modeling Language) 18 3.4 UML 다이어그램 18 제4장 석유 생산 시스템의 시뮬레이션 21 4.1 시뮬레이터의 의의 21 4.2 시뮬레이터 모델링 22 4.3 심해 석유 생산 시스템의 layout 25 4.4 시뮬레이션의 구현 방법 27 4.5 심해 석유 생산 시뮬레이션 29 제5장 결론 33 참고문헌 3

문제해결적 파국화와 침투적 파국화 : 걱정과 스트레스에 대한 대처에서의 차이점

학위논문(석사)--서울대학교 대학원 :심리학과 임상·상담심리학전공,2003.Maste

A Study on the Packche tombs of Hansong period

학위논문(박사)--서울大學校 大學院 :考古美術史學科 考古學專攻,1995.Docto

The Effects of spinal cord stimulation on spinal nociceptive process evaluated by cord dorsum potential in cats

학위논문(박사)--서울대학교 대학원 :의학과 마취과학전공,1998.Docto

(The) Influence of Character Strengths and a Strengths-Based Positive Psychotherapy on Happiness

학위논문(박사) --서울대학교 대학원 :심리학과(임상·상담심리학전공),2010.2.Docto

경막외 카테테르의 방향이 국소마취제의 분포에 미치는 영향

학위논문(석사)--서울대학교 대학원 :의학과 마취과학전공,1996.Maste