• 한국정보통신학회논문지
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• 제4권1호
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• pp.241-250
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• 2000

Chua 회로는 어트렉터와 다양한 분기를 나타내는 간단한 전자 회로로 2개의 캐패시터, 인덕터, 선형 저항 그리고 비선형 저항으로 구성되어 있다. 본 논문에서는 두 개의 동일한 Chua 회로를 이용하여 송신부와 수신부를 구성하고 이 사이에 등가 손실 전송선로를 카오스 동기화 및 암호화 통신 방법에 대하여 연구하였다. 손실 등가 전송 시스템의 동기화는 결합 동기 이론을 적용하기 곤란하기 때문에 구동동기 이론과 결합 동기 이론을 결합한 구동-결합 동기 이론을 제안하였다. 두 개의 동일한 Chua 회로에 등가 손실 전송 선로를 두어 전송로를 구성한 후 송신부와 전송선로 사이는 구동-결합 동기 이론을, 전송선로와 수신부 사이는 결합 동기 이론을 적용한 동기화 방법을 제시하였다. 손실 등가 전송 선로를 가진 Chua 회로의 카오스 암호화 방법은 송신부에서 카오스 신호화 정보 신호를 가산기를 이용하여 합성한 후 수신부에서 이들 신호를 분리하는 복조 방법을 제안하였다.

• 가족자원경영과 정책
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• 제16권2호
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• pp.145-163
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• 2012

The purpose of this study is to understand the process of "standing alone" in divorced single fathers on the basis of qualitative data collected through in-depth interviews with 10 divorced single fathers. Data were analyzed on the basis of grounded theory analysis in open coding, and 154 concepts, 39 sub-categories, and 14 categories were derived. According to the results of this study, the process phenomenon of divorced single fathers' standing alone was "the restraint and chaos of pain". This study could identify the consecutive process of four identified stages: marriage life's rupture, pain and chaos, deliberation and decision, and role adaption. In selective coding, the core category was "to pass through the restraint of pain and embrace children and stand alone". There were three types of standing alone: maintaining barely, enduring hopefully, and living initiatively. This study showed the necessity of social support and the basic data by type analysis through the process of standing alone. This study provided substantive knowledge generated through the voices of the persons concerned.

• 한국재난정보학회 논문집
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• 제11권4호
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• pp.542-547
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• 2015

본 연구는 복잡다단한 환경변화에 효과적으로 대응하기 위하여 오늘날 여러 학문 분야에서 주로 이용되고 있는 복잡계 이론(Complex System Theory)의 사고와 방법론을 기반으로 테러대응을 위한 분야별 제 접근에 대하여 논하는데 그 목적이 있다. 그 결과 초기조건의 민감성, 프랙탈과 자기유사성, 자기 조직화, 창발, 공진화, 혼돈의 가장자리의 복잡계 이론을 통하여 테러대응 분야의 적용가능성을 은유적으로 탐색할 수 있을 것이다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2000년도 추계학술대회 학술발표 논문집
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• pp.227-230
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• 2000

Chuas circuit is a simple electronic network which exhibits a variety of bifurcation and attractors. The circuit consists of two capacitors, an inductor, a linear resistor, and a nonlinear resistor. In this paper, a transmitter and a receiver using two identical Chuas circuits are proposed and synchronizations of a equivalent wire and wireless power line are investigated. Since the synchronization of the equivalent wire and wireless system is impossible by coupled synchronization, theory having both the drive-response and the coupled synchronization is proposed. As a result, the chaos synchronization has delay characteristics in the equivalent wire and wireless transmission system caused by the line parameters L and C.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.161-164
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• 1995

Nonlinear analysis of various phenomena has been developed with improvement of computer. The characteristics form nonlinear analysis are available in monitoring and diagnosis state of system. There are many nonlinear property in cutting process, but nonlinear signals have been considered as noise. In this study, nonlinear analysis technique is applied and it will be verified that cutting force is chaos by calculating Lyapunov exponents,fractal dimension and embedding dimension. The relation between characteristic parameter calculated form sensor signal and various cutting condition is investigated.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2000년도 추계종합학술대회
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• pp.259-262
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• 2000

Chua's circuit is a simple electronic network which exhibits a variety of bihucation and attractors. The circuit consists of two capacitors, an inductor, a linear resistor, and a nonlinear resistor. In this paper, a transmitter and a receiver using two identical Chua's circuits are proposed anti synchronizations of a equivalent power line are investigated. Since the synchronization of the equivalent power line system is impossible by coupled synchronization, theory having both the drive-response and the coupled synchronization is proposed. Af a result, the chaos synchronization has delay characteristics in the equivalent power line transmission system caused by the line parameters L and C.

• 한국디지털건축인테리어학회논문집
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• 제9권3호
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• pp.15-23
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• 2009

Chaos theory, qualitative study of unstable aperiodic behavior in deterministic nonlinear dynamical systems, is dominant paradigm in the twenty first century. Fractal geometry, as an expressed form of chaos, now influences many areas such as architecture, art, music, economics, literature, etc. The purpose of this study is to analyze fractal geometry and fractal formative elements in architectural design. There are scaling, superimposition, distortion, deformation and repetition in the fractal form generator that can be applied to design concept and process in architecture. This study shows fractal geometry can be the architectural form creation method. Fractal geometry similar to nature's patterned order can be provided endless possibilities for design analysis and methodology in architecture. Therefore the further study of fractal geometry should progress synthetically through the basis of the study.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.817-821
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• 1997

Ever since the nonlinearity of machine tool dynamics was established, researchers attempted to make use of this fact to devise better monitoring, diagnostics and system, which were hitherto based on linear models. Theory of chaos, which explains many nonlinear phenomena comes handy for furthering the analysis using nonlinear model. In this study, measuring system will be constructed using multi-sensor (Tool Dynamometer, Acoustic Emission) in end millingprocess. Then, it will be verified that cutting force is low-dimensional deterministic chaos calculating Lyapunov exponents, Fractal dimension, Embedding dimension. Aen it will be investigated that the relations between characteristic parameter caculated form sensor signal and tool wear.

• 한국정밀공학회지
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• 제14권11호
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• pp.93-101
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• 1997

Ever since the nonlinearity of machine tool dynamics was established, researchers attempted to make use of this fact to devise better monitoring, diagnostics and control system, which were hitherto based on linear models. Theory of chaos which explains many nonlinear phenomena comes handy for furthering the analysis using nonlinear model. In this study, measuring system will be constructed using multi-sensor (Tool Dynamometer, Acoustic Emission) in end milling process. Then, it will be verified that cutting force is low-dimensional chaos by calculating Lyapunov exponents. Fractal dimension, embedding dimension. And it will be investigated that the relation between characteristic parameter calculated from sensor signal and tool wear.

• 음성과학
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• 제8권3호
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• pp.133-142
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• 2001

In the area of speech processing, raw signals used to be presented in 2D format and different kinds of algorithms use the format to solve their problems. However, such kinds of presentation methods have limitations to extract characteristics from the signal, even though the algorithms are quiet good. The basic reason is that not much information can be detected from the 2D signal. Strange attractor in the field of chaos theory provides the 3D presentation method. In the area of the recognition problem, signal construction method is very important because good features can be detected from a good shape of attractors. This paper discusses a new presentation method that can be used to construct strange attractor in a different way. Normal strange attractor uses time-delay idea while the new method uses time-delay and vector average. This method provides us good information to be applied to speaker recognition problem.