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고정밀 레이저 거리 계측기용 디지털 복조 회로 개발에 관한 연구
배영철,박종배,조의주,강기웅,강건일,김현우,김은주,Bae, Young-Chul,Park, Jong-Bae,Cho, Eui-Joo,Kang, Ki-Woong,Kang, Keon-Il,Kim, Hyeon-Woo,Kim, Eun-Ju 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.4
기존의 크리스탈 주파수 발진기는 주파수를 자유롭게 변경하지 못할 뿐만 아니라 이들 사이의 동기화에 대한 어려움이 존재한다. 이를 극복하는 새로운 디지털 복조 회로(DDC; Digital Demodulation Circuit) 시스템을 제안하고 이를 구현하였다. 구현한 디지털 복조 회로는 소수점 두 자리까지 자유롭게 주파수를 생성할 수 있다. 또한 레이저 거리 계측기에서 사용하는 많은 소자들이 요구하는 주파수 클록 생성과 오차 저감이 가능하여 고정밀 거리 측정이 가능한 시스템에 적용할 수 있다. We proposed and implemented new DDC system which overcomes the difficulties including lack of flexibility of modifications of frequency which is the problem of previous frequence oscillator and synchronization. New DDC system can create frequence in two decimal points. Moreover, due to its usage in adjusting to frequence clock which is required by many consumers, laser distance instrument can reduce its error; thus, implementation of system is capable of high precision distance measurement can be performed.
Synchronization of Dynamical Happiness Model
배영철 한국지능시스템학회 2014 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.14 No.2
Chaotic dynamics is an active research area in fields such as biology, physics, sociology,psychology, physiology, and engineering. Interest in chaos is also expanding to the socialsciences, such as politics, economics, and societal events prediction. Most people pursuehappiness, both spiritual and physical in many cases. However, happiness is not easy to define,because people differ in how they perceive it. Happiness can exist in mind and body. Therefore,we need to be happy in both simultaneously to achieve optimal happiness. To do this, we needto synchronize mind and body. In this paper, we propose a chaotic synchronization method ina mathematical model of happiness organized by a second-order ordinary differential equationwith external force. This proposed mathematical happiness equation is similar to Duffing’sequation, because it is derived from that equation. We introduce synchronization methodfrom our mathematical happiness model by using the derived Duffing equation. To achievechaotic synchronization between the human mind and body, we apply an idea of mind/bodyunity originating in Oriental philosophy. Of many chaotic synchronization methods, we useonly coupled synchronization, because this method is closest to representing mind/body unity. Typically, coupled synchronization can be applied only to non-autonomous systems, such as amodified Duffing system. We represent the result of synchronization using a differential timeseries mind/body model.
리아프노프 함수를 이용한 Chua 오실레이터 회로에서의 카오스 제어
배영철,고재호,유창환,홍대승,임화영 한국정보통신학회 1999 한국정보통신학회논문지 Vol.3 No.1
Chua 발진기의 카오스 신호를 선형 상태 피드백 제어 이론을 적용하여 평형점, 1주기, 2주기의 신호로 제어하는 방법을 제안하였다. 제안한 선형 상태 피드백 이득 값을 리아프노프 함수를 이용하여 Chua 오실레이터가 나타내는 모든 카오스 현상을 제어할 수 있도록 파라미터 부호의 조합에 의해 4가지로 분류하였다. 본 논문의 상태 피드백 제어 기법은 시스템의 카오스 상태에서 얻고자 하는 상태(평형점, 주기 신호등)로 효율적으로 제어 가능하고, 매우 간단한 구조로 파라미터의 변화 없이 최소의 입력으로 가능케 하였다. In this paper, chaotic signals of a Chua's oscillator are effectively controlled to low periodic signal(1-periodic signal, 2-periodic signal, etc) or equilibrium point using the linear state feedback technique. The proposed linear state feedback technique has characteristics, that any solution of the Chua's oscillator can be a goal of the control(fixed point, periodic orbit, etc). The controller has a very simple structure, which does not require adjusting system parameters.
배영철,임동진,허선집,곽봉근,조보형 한국화재감식학회 2018 한국화재감식학회 학회지 Vol.9 No.1
In this paper, a fire occurred during the charging process of a device using a series of lithium secondary batteries, such as a solar cell car, at OOOOOOOO University (Nam Inchon Campus) located in Juan-dong, Nam-gu, Incheon, on May 07, The cause of the fire was analyzed and inferred through a real fire experiment. Although the fire and explosion accidents of lithium secondary batteries occur every year and safety standards for them are gradually upgraded, objective and rational accident analyzing methods of lithium secondary batteries and sharing of accident cases are systematically carried out after ignition and explosion And when a lithium secondary battery is ignited or exploded, the appearance and deformation of the external appearance are so severe that it is difficult to analyze the cause of the clear reason. In this study, the rechargeable lithium secondary battery sold in the market was selected, and the situation where the battery was charged during the charging situation was pointed out and the possibility of the ignition was reproduced and analyzed by changing the condition of the charging condition. I would like to use it as a reference for analysis.