• Journal of Advanced Navigation Technology
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• v.20 no.6
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• pp.631-637
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• 2016

Quantum cellular automata (QCA) are one of the alternative technologies that can overcome the limits of complementary metal-oxide-semiconductor (CMOS) scaling. It consists of nano-scale cells and demands very low power consumption. Various circuits on QCA have been researched until these days, and in the middle of the researches, exclusive-OR (XOR) gates are used as error detection and recover. Typical XOR logic gates have a lack of scalable, many clock zones and crossover designs so that they are difficult to implement. In order to overcome these disadvantages, this paper proposes XOR design using majority gate reduced clock zone. The proposed design is compared and analysed to previous designs and is verified the performance.

• Proceedings of the KIEE Conference
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• 1993.07b
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• pp.923-928
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• 1993

Genetic algorithms are powerful optimization methods based on the mechanism of natural genetics and natural selection. Genetic algorithms reduce chance of searching local optima unlike most conventional search algorithms and especially show good performances in complex nonlinear optimization problems because they do not require any information except objective function value. This paper presents a new model based on sexual reproduction in nature. In the proposed Sexual Reproduction model(SR model), individuals consist of the diploid of chromosomes, which are artificially coded as binary string in computer program. The meiosis is modeled to produce the sexual cell(gamete). In the artificial meiosis, crossover between homologous chromosomes plays an essential role for exchanging genetic informations. We apply proposed SR model to optimization of the design parameters of Single-sided Linear Induction Motor(SLIM). Sequential Unconstrained Minimization Technique(SUMT) is used to transform the nonlinear optimization problem with many constraints of SLIM to a simple unconstrained problem, We perform optimal design of SLIM available to FA conveyer systems and discuss its results.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.20 no.4
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• pp.31-38
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• 2021

In this paper, we proposed an optimal design for determining the shape of a lifting lug freely by applying a multivariate function to the D-type lug, which is commonly used in shipyards. We derived the optimal aspect ratio of the lug through structural analysis and analyzed the safety and behavior of the lug aspect ratio. As a result, two types of final candidates, both lighter than the existing lug weight, were suitable for the ratio. They were found to have the greatest force at an angle of 45 degrees when a load of 100 tons was imposed. When the horizontal and vertical feature ratio of the lug was 1:3, it showed excellent results in terms of safety rates while maintaining weight reduction and functional aspects.

• Journal of Mechanical Science and Technology
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• v.19 no.5
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• pp.1072-1079
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• 2005

Conceptual design is the first step in the overall process of product design. Its intrinsic uncertainty, imprecision, and lack of information lead to the fact that current conceptual design activities in engineering have not been computerized and very few CAD systems are available to support conceptual design. In most of the current intelligent design systems, approach of principle synthesis, such as morphology matrix, bond graphic, or design catalogues, is usually adopted to deal with the concept generation, in which optional concepts are generally combined and enumerated through function analysis. However, as a large number of concepts are generated, it is difficult to evaluate and optimize these design candidates using regular algorithm. It is necessary to develop a new approach or a tool to solve the concept generation. Generally speaking, concept generation is a problem of concept synthesis. In substance, this process of developing design candidate is a combinatorial optimization process, viz., the process of concept generation can be regarded as a solution for a state-place composed of multi-concepts. In this paper, genetic algorithm is utilized as a feasible tool to solve the problem of combinatorial optimization in concept generation, in which the encoding method of morphology matrix based on function analysis is applied, and a sequence of optimal concepts are generated through the search and iterative process which is controlled by genetic operators, including selection, crossover, mutation, and reproduction in GA. Several crucial problems on GA are discussed in this paper, such as the calculation of fitness value and the criteria for heredity termination, which have a heavy effect on selection of better concepts. The feasibility and intellectualization of the proposed approach are demonstrated with an engineering case. In this work concept generation is implemented using GA, which can facilitate not only generating several better concepts, but also selecting the best concept. Thus optimal concepts can be conveniently developed and design efficiency can be greatly improved.

• Journal of the korean veterinary medical association
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• v.36 no.6
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• pp.517-525
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• 2000

실험은 과학적 사실을 규명하기 위한 적극적인 수단이다. 실험이란 문자 그대로 검정 (test)을 의미하는데 좀 더 공식적으로 표현하자면 '연구자가 어떤 체계(system) 혹은 과정 (process)속으로 의도하는 변화를 투입 변수 (input variable)로 넣었을 때 그 결과로 얻게되는 반응에서 어떠한 변화가 초래되었는지 그 원인을 찾아내는 일련의 검정(series of tests)'이라고 정의할 수 있다. 넓은 의미에서 볼 때 실험의 형태는 발생조사(outbreak investigation)와 같이 현장 (fidld)에서 진행되는 관찰연구 (observational study)와 실험실 연구로 대별된다. 어떠한 연구형태이든 실험의 객관성을 달성하기 위해서는 연구의 목적에 합당한 실험계획을 작성하는 것이 필수적이다. 아무리 완벽하게 실험을 수행했다고 하더라도 실험계획에서 심각한 문제가 있다면 그 결과에 대해서는 신뢰성을 부여할 수 없기 때문이다. 본 논문에서는 실험을 계획할 때 적용되는 원리와 분산분석에서의 다중비교 및 의학연구에서 활용빈도가 높은 교차계획법 (crossover design)에 대하여 소개하고자 한다.

• Journal of the Korea Society of Computer and Information
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• v.22 no.2
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• pp.105-110
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• 2017

We propose a effectiveness of the assistant pad during cardiopulmonary resuscitation and provide basic data for high quality cardiopulmonary resuscitation. The subjects of the study were 28 students in the emergency department who completed the BLS Health Care-Provider under the experimental study by the randomized crossover design. Data were analyzed by using SPSS 20.0 Version. The results of this study showed that chest compressions using assistant pads decreased pain and fatigue than normal chest compressions, and the depth of chest compressions was deeper than normal depth. The results of this study shows that the use of assistant pads between the one hand and the other hand during cardiopulmonary resuscitation may increase accuracy and depth were improved. Therefore intensive indicator also improved. However, with regard to the use of assistant pads, further studies will be needed to identify the potential for clinical use.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.5
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• pp.230-237
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• 2003

Current mode control has been used for DC to DC converters for over twenty years. There are many different control schemes which use the inductor current signal in one way or another to control the DC to DC converter. In this paper, the state space averaging technique is applied for the analysis of flyback type current mode control circuit. We made real converter for the guarantee of stable output characteristic and proper design of feedback circuit. The validity of proposed method is verified from test result. The improvement of stability is confirmed by sinusoidal signal injection method with isolated transformer. It is known that phase margin is sufficient and gain crossover frequency fc is early 1/5 of switching frequency, fs, from the experimental result with frequency response analyzer.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2002.05a
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• pp.23-27
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• 2002

본 논문에서는 정보보호에서 지능형 침입탐지시스템(Intrusion Detection System :IDS) 의한 모델을 제안한다. 이 모델은 데이터 마이닝 분야와 정보보호 분야의 결합된 방법을 이용한다. 즉, 계산환경을 격상하거나 새로운 공격 방법들 때문에 내장된 IDS를 보완 할 필요가 종종 있다. 현재 사용하고 있는 많은 IDS들은 전문적인 지식을 손으로 작성했기 때문에 IDS들의 변환은 가격이 매우 비싸며, 속도가 느리다는 단점이 있다. 이에 본 모델은 침입탐지 모델을 적응 적으로 구축하는데 데이터 마이닝 구조를 활용한다. 데이터 마이닝(Data Mining : DM)의 기술인 연관 규칙, 순차 패턴, 분류, 군집화, 유전자 알고리즘 기법(GA)인 Selection, Crossover, Mutation, Evaluation, Fitness Function의 기능을 접목하여 단점을 보안하고 처리 성능을 최대로 하는 즉, 보다 안전한 지능형 침입 탐지 시스템(IDS) 모델을 제안한다.

• Journal of Korean Academy of Nursing
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• v.33 no.6
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• pp.839-846
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• 2003

Purpose: Objectives of the study is to examine the effectiveness of aromatherapy massage among middle aged women with abdominal obesity. Method: AB/BA crossover design of random blind assignment was applied. Aromatherapy and placebo massage were given to Group(A), Group(B), each groups applied each massages for 2weeks alternatively. Weight, abdominal circumference and appetite were compared for results check among the subjects. Result: The apparent effectiveness of Aromatherapy Massage in reducing weight, abdominal circumference and appetite was noted. Conclusion: On the basis of results, they strongly support the facts of reduction of abdominal obesity by applying aromatherapy massage for middle aged women.

• Journal of Korea Society of Industrial Information Systems
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• v.10 no.4
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• pp.16-25
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• 2005

In this paper, we proposed a novel algorithm combined simulated annealing and genetic algorithms for designing optimal binary phase computer generated hologram. In the process of genetic algorithm searching by block units, after the crossover and mutation operations, simulated annealing algorithm searching by pixel units is inserted. So, the performance of BPCGH was improved. Computer simulations show that the proposed combined iterative algorithm has better performance than the simulated annealing algorithm in terms of diffraction efficiency