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무리수 키를 사용하는 혼돈 맵의 2진 순서 발생기 구현
박광현 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-
In this work, a sort of generation algorithm for chaotic binary sequence is presented, and it has been also shown that chaotic binary sequence generated by piecewise linear one-dimensional chaotic map(tent map) with the inputs of irrational nembers is more longer than random binary sequence obtained from mLFSR(maximum-length Linear Feedback Shift Register). The tent map of 8-bit finite precision representation used in this brief is implemened with the digital device, 256×8 ROM(Read Only Memory).
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박광현 忠州大學校 2010 한국교통대학교 논문집 Vol.45 No.-
The iterative process can be viewed as a feedback loop in the system and the repeated composition of the same functions. The digital circuit design for the iterative process of two chaotic functions-the saw tooth function and tent function-are built on the concept of the composition of functions, and is presented in this paper.
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다운증아 어머니의 기대성향이 비계화 교수와 문제해결학습에 미치는 효과
여광응,윤숙경,박현옥 한국특수교육문제연구소 2003 특수교육저널 : 이론과 실천 Vol.4 No.1
이 연구는 어머니-다운증아의 상호작용을 통한 문제해결과정에서 어머니의 기대성향이 어머니 교수중재의 양과 수준에 미치는 영향과 다운증아의 적목피라미드 문제해결과제에 미치는 효과를 밝히는데 두고 다운증아 어머니의 기대성향에 따른 어머니의 비계화 교수와 아동의 문제해결학습간의 관계를 탐색하고자 하는 것으로,만 6세인 다운증아 남아 3 명과 여아 3명인 전체 6 명 그리고 그 어머니들을 대상으로 하였다. 어머니-아동의 문제해결상호작용과정을 비디오로 촬영하여,어머니의 교수중재는 중재 수준,중재 양,유관 및 비유관 여부를 중심으로 그리고 아동의 문제해결은 성패를 중삼으로 양적 · 질적 분석을 병행 하였다. 연구결과 어머니의 기대성향이 긍정적일수록 아동의 문제해결 성패에 기반하여 중재 양과 중재 수준을 조절하는 유관 중재를 많이 사용하고 문제해결학습에서 부정적 기대성향의 다운증 자녀보다 더 긍정적 학습결과를 보인다. 또한 어머니의 비계화 교수 변인과 자녀의 문제해갤학습 변인사이에는 상호 관련작 양방향성 효과가 있다. The purpose of this study was to examine the relationships between maternal expectancy and maternal use of scaffolded instruction and problem-solving skills of children with Down syndrome. For this purpose, three boys and three girls with Down syndrome whose age were six years old and their mothers participated in this study. The mother-child interaction regarding problem-solving tasks was videotaped and analyzed. The qualitative and quantitative analyses were conducted to find out the condition and quantity of scaffolded instruction used by mothers, and degree of their contingency of the tasks. In addition, it was analyzed whether these children resolved given problems successfully or not. As a result, it was found that the mothers who had more positive expectancy relied more on contingent intervention that regulated the quality and quantity of instructions based on the success or failure of their child' s problem solving tasks, and that their children produced better learning outcome than the children of the mothers who had more negative expectancy. In addition, two-way interrelationships between the scaffolded instruction variable of the mothers and their children ’ s problem-solving learning variable were found.
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박광현 한국교통대학교 2014 한국교통대학교 논문집 Vol.49 No.-
New mathematical model of the tent function is defined and chaotic binary generation circuit using above model is designed at the this work. The discretized truth of the tent function as a one-dimensional chaotic is presented, and design procedure of chaotic binary generation circuit is presented also, as a result, overall chaotic key-stream generator is showed in this paper
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박광현 忠州大學校 2012 한국교통대학교 논문집 Vol.47 No.-
The design for digital circuits of chaotic composition function which is used for the key-stream generator is studied in this work. The overall design concept due to the mathematical model of chaotic key-stream generator is to be the explained in detail, and also the discretized truth table of chaotic composition function is presented in this paper.
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박광현 韓國交通大學校 2013 한국교통대학교 논문집 Vol.48 No.-
In order to design of the chaotic key-stream generator possessing the chaotic dynamics and more long period(or cycle), a linear-feedback shift register(LFSR) is connected to the circuit of chaotic composition map in this work. As a result, the digital circuits and discretized truth table for the chaotic key-stream generator is presented also.
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박광현 忠州大學校 2009 한국교통대학교 논문집 Vol.44 No.-
Design method of a logistic map which is one of chaotic map is proposed. In order to achieve the discritization of logistic function, the truth table of discretized tent function is used as the progress of inguiries. The proposed design method not only includes the very simple processes, but also has easy hardware implemention. In this work, the overall concept of logistic map design is to be explained in detail while the truth tables of discretized chaotic maps is given partially.
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모기 살충성 내독소를 생산하는 Bacillus thuringiensis subsp. guiyangiensis 21-2균주(H serotype 43)의 특성
김광현,김위종 동의대학교 기초과학연구소 2000 基礎科學硏究論文集 Vol.10 No.1
To prevent appearance of resistant mosquitoes against δ-endotoxin of Bacillus thuringiensis subsp. israelensis (Bu) in field, a mosquitocidal Bacillus thuringiensis strain 21-2(Bt 21-2) producing a new type of δ-endotoxin was isolated. The strain Bt 21-2 belongs to H serotype43. B. thuringiensis subsp. guiyangiensis(Btg). The δ-endotoxins from the strain Bt 21-2 and the strain Bti were a cuboid shape morphologically, but the δ-endotoxin from the type strain Btg was a bipyramidal shape on phase contrast microscope. The δ-endotoxin of the strain Bt 21-2 was composed of 150.90 and 70 KDa proteins on SDS-PAGE, and the antigenicity of δ-endotoxin of the strain Bt 21-2 was different from that of the strain Bti on immunoblot. The δ-endotoxin gene of the strain Bt 21-2 was not amplified with specific primers of δ-endotoxin gene (cry4A and cry4B) of the strain Bti on PCR.
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朴廣炫 忠州大學校 1999 한국교통대학교 논문집 Vol.34 No.2
Many applications in the digital engineering and computer field require random numbers or random binary sequenes. Although there are a number ways in which one can generate pseudorandom binary sequences for various coded waveforms, all sequenes of interest can be practically generated by a particular technique involving shift-register implementation. In this paper, to increase the randomizing effect, it was necessary to introduce a new technique. This was achieved through the multiplication of chaotic function. The analysis and comparison of conservative transformation which is known as a pseudorandom digital transformation. New technique presented in this paper produces a deterministic chaos sequences, and must be simple, so that one can realize it with a small investment in hardware or in software.
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박광현,김승연 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.1
We propose the state machine of digital sequential system using the deterministic chaotic function for a practical application of the chaotic dynamics. Chaotic state machine is designed by the shift register as a view of hardware, and is designed to have chaotic characteristic by performing the saw-tooth function.
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