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하이브리드 유전자 알고리즘을 이용한 다목적 신뢰성 설계
김종률,박월선,이재욱 東西大學校 2001 동서논문집 Vol.7 No.-
A bicriteria reliability apportionment problem for a system consisting n subsystems with time-dependent reliability is manipulated in this paper. This reliability design problem with two objectives determines the optimum level of component reliability and the number of redundant components at each subsystem. The problem is formulated as a bicriteria nonlinear mixed integer programming problem, subject to several design constraints. Also, a hybrid genetic algorithm is used in this paper to find an optimal or near optimal solution and we propose the method which search the Pareto solutions of bicriteria reliability apportionment problems. Furthermore, numerical experiments are illustrated to demonstrate the efficiency of the proposed method.
신뢰성을 고려한 광통신 네트워크 설계를 위한 유전자 알고리즘
이재욱,김종률,박월선 東西大學校 2001 동서논문집 Vol.7 No.-
Increasing attention is being recently devoted to various problems inherent in the topological design of destributed telecommunication networks. In the distributed telecommunication networking, the topological structure of these networks is based on a single central office (exchanger), a number of multiplexing centers, and a lot of users. Especially, considering the high cost of the fiber optic cable that is used to connect the between centers and the between center and users, the network architecture is composed of a spanning tree. The optimization problem is reduced to choose the number and locations of the multiplexing centers, with network reliability constraints. Recenlly, genetic algorithms (GAs) have got a great advancement in related research fields, such as network optimization problem, combinatorial optimization, multiobjective optimization, and so on, and have received a great deal of attention about its ability as optimization techniques for many real-world problems. In this paper, a GA approach is presented for network topology design of wide-band multiplexed networks, considering the network reliability related to the probability of failures. We also employ the Pru˝fer number and clustering string in order to represent chromosomes. Finally, we get some experiments in order to certify the Quality of the network designs obtained by using proposed GA.
핵의학검사의 환자 유효선량 계산 프로그램 제작에 관한 연구
선종률(Jong-Ryul Seon),길종원(Jong-Won Gil) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.3
본 연구의 목적은 핵의학검사를 하는 수검자(환자)의 유효선량(mSv)을 손쉽게 산출할 수 있는 전용 프로그램을 제작·보급하여 핵의학검사의 피폭선량 연구와 선량정보 공개를 위해 조력하고자 한다. 프로그램은 ICRP 80, 106 Report와 추록4에 수록되어 있는 방사성의약품의 방사능당 유효선량(mSv/MBq)을 Database로 만든 다음 5가지(Area, Clark, Solomon(Fried), Webster, Young) 소아주입량 산출법과 7가지 체표면적 산출법이 적용되도록 Microsoft의 Visual Basic(In Excel)으로 제작하였다. 프로그램은 수검자의 연령, 방사성핵종, 표지화합물, 그리고 인체주입량을 입력하면 유효선량(mSv)이 산출된다. 소아의 경우 연령 입력 시 소아산출법이 활성화 되며 적용할 소아산출법을 선택하면 된다. 그리고 소아산출법 중 Area법을 선택하는 경우 체표면적산출법을 고르는 선택창이 활성화 된다. 그런 다음 성인의 주입량을 입력하면 소아의 주입량과 유효선량(mSv)이 자동으로 산출된다. 본 연구에서 제작한 핵의학검사의 환자 유효선량 계산 프로그램은 실제 계측선량이 아니지만 핵의학 검사 시 받게 되는 인체의 내부피폭선량을 가장 근접하게 산출할 수 있는 도구로서 의미가 있다. 향후 프로그램의 활용도를 높이기 위해 모바일기기에서 사용할 수 있는 애플리케이션으로 제작하여 일반인도 쉽게 접근할 수 있도록 할 것이다. The aim of this study was to develop and distribute a dedicated program that can easily calculate the effective dose of a patient undergoing nuclear medicine examinations, and assist in the study of dose of nuclear medicine examinations and information disclosure. The program produced a database of the effective dose per unit activity administered (mSv/MBq) of the radiopharmaceuticals listed in ICRP 80, 106 Report and the fourth addendum, was designed through Microsoft Visual Basic (In Excel) to take the effect of 5 different (Area, Clark, Solomon(=Fried), Webster, Young) of pediatric dose calculation methods and 7 different body surface area calculation methods. The program calculates the effective dose (mSv) when the age, radionuclide, substance, and amount injected in the human body is inputted. In pediatric cases, when the age is entered, the pediatric method is activated and the pediatric method to be applied can be selected. When the BSA (Body Surface Area) formula is selected in the pediatric calculation method, a selection window for selecting the body surface area calculation method is activated. When the adult dose is input, the infant dose and the effective dose (mSv) are calculated automatically. The patient effective dose calculation program of the nuclear medicine examinations produced in this study is meaningful as a tool for calculating the internal exposure dose of the human body that is most likely to be obtained in nuclear medicine examinations, even though it is not the actual measurement dose. In the future, to increase the utilization of the program, it will be produced as an application that can be used in mobile devices, so that the public can access it easily.
Faujasite 제올라이트의 CO 흡착에 대한 양자화학적 연구
김종택,이종렬,박두선 한국화학공학회 1989 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.27 No.5
여러 가지 양이온이 교환된 faujasite type 제올라이트와 CO 분자간의 상호작용과 제올라이트의 전자구조를 교환된 양이온의 종류, 제올라이트 골격 내의 Si/Al의 비에 따라 양자화학적 방법의 하나인 CNDO/2 법을 사용하여 계산하였다. 제올라이트 골격 내의 전자밀도는 Si/Al의 비가 감소할수록 증가하였으며, T-O간의 결합차수는 Si/Al의 비가 감소함에 따라 전반적으로 감소하였다. 제올라이트에 교환되어 있는 양이온과 CO간의 상호작용은 양이온의 정전기적 장의 세기와 밀접한 관계가 있었으며, Be^(2+)>Mg^(2+)>Li^+>Ca^(2+)>Na^+>H^+의 순서이었다. 제올나이드에 CO가 흡착되면 CO의 C-O간 결합차수는 증가하였으며, 이것은 IR 결과와 좋은 상관관계를 나타내었다. The CNDO/2 method was used to investigate the electronic structure and the interaction of CO molecules with the exchanged cations in the zeolites which have various Si/Al ratios. The electron densities of zeolites increased and the bond orders of T-O generally decreased with decreasing the Si/Al ratio. The strength of bond between CO molecules and the exchanged cations in the zeolites increased in the following order:H^+<Na^+<Ca^(2+)<Li^+<Mg^(2+)<Be^(2+). The interaction strength increased obviously with the electrostatic field of cations. The C-O bond orders of CO molecules interacting with the exchanged cations in the zeolites increased compared to those of free CO molecule. This was in a good agreement with IR results.