• 융합신호처리학회논문지
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• 제15권2호
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• pp.48-54
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• 2014

원소 ${\in}F(p)$에 대하여 두 종류의 기저함수가 알려져 있다. 통상적인 다항식 기저(polynomial bases)는 $\{1,{\alpha},{\alpha}^2,{\cdots},{\alpha}^{n-1}\}$로 이루어지고 이와 다르게 정규 기저(normal bases)는 $\{{\alpha},{\alpha}^p,{\alpha}^{p^2},{\cdots},{\alpha}^{p^{n-1}}\}$의 형태를 갖는다. 본 논문에서는 소수 p의 원소로 이루어지는 유한장 GF(p)상에서 n차원 벡터공간인 확대장 $GF(p^n)$을 이룰 수 있는 정규기저의 발생과 생성에 대하여 검토하고 정규기저를 기반으로 부호계열 발생알고리즘을 분석하여 발생기구성함수를 도출하였다. 차수 n=5와 n=7인 두 종류의 정규기저를 생성할 수 있는 정규다항식을 발견하고 부호계열 발생기를 설계 구성하였다. 마지막으로 Simulink를 이용하여 두 종류(n=5, n=7)의 부호계열 그룹을 발생시키고 발생된 부호계열간의 자기상관함수, $R_{i,i}(\tau)$와 상호상관함수, $R_{i,j}(\tau)$, $i{\neq}j$ 특성을 분석하였다. 이 결과로부터 정규기저를 이용한 부호계열 발생알고리즘의 분석, 그리고 부호계열 발생기 설계와 구성이 타당함을 확인하였다.

• International Journal of Reliability and Applications
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• 제17권1호
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• pp.65-84
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• 2016

Motivated by the recent work of Cordeiro and Castro (2011), we study the Kumaraswamy exponentiated Frechet distribution (KEF). We derive some mathematical properties of the (KEF) including moment generating function, moments, quantile function and incomplete moment. We provide explicit expressions for the density function of the order statistics and their moments. In addition, the method of maximum likelihood and least squares and weighted least squares estimators are discuss for estimating the model parameters. A real data set is used to illustrate the importance and flexibility of the new distribution.

• 대한전자공학회논문지TC
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• 제49권4호
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• pp.1-8
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• 2012

본 논문에서는 레일리 페이딩 환경에서 OAF (opportunistic amplify-and-forward) 릴레이 전송 기법의 정확한 성능을 제시하는 새로운 분석 기법에 대해서 알아본다. 이를 위해 집합 연산 기반의 선택될 확률을 활용한다. 이를 기반으로 OAF 릴레이 전송기법의 수정된 MGF(modified moment generating function)를 제안한다. 제안된 MGF 를 바탕으로 OAF 릴레이 전송 기법의 특성을 정확하게 표현해주는 M-ary Phase Shift Keying (MPSK) 심볼 오류 확률을 제안한다. 모의 실험 결과를 통해서 제안된 심볼 오류 확률의 정확함을 확인한다.

• 동력기계공학회지
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• 제3권2호
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• pp.64-69
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• 1999

The paper shows a result for development of BLDC motor drive by using a resolver as position detection sensor. The developed drive use a method detecting rotor position based on HSI interrupt function of microprocessor without a specialized counting circuit. The algorithm generating three-phase PWM wave to change switching voltage and current is realized based on single chip microprocessor. The PWM generating part and position counting circuit are realized by software technique without usage of conventional analogue circuit or object-oriented chips. So the drive system become compact. The effectiveness of the developed drive is verified by experimented results of speed response for step reference input.

• 대한전기학회논문지:전력기술부문A
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• 제55권9호
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• pp.392-398
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• 2006

Maintenance scheduling of generating units (MSU) has strategic dimension in an oligopolistic market. Strategic MSU of gencos can affect a market power through capacity withdrawal which is related to bidding strategy in an generation wholesale market. This paper presents a combined framework that models the interrelation between competitive bidding and strategic MSU. The combined game model is represented as some sub-optimization problems of a market operator (MO) and gencos, that should be solved through bi-level optimization scheme. The gradient method with dual variables is also adopted to calculate a Nash Equilibrium (NE) by an iterative update technique in this paper. Illustrative numerical example shows that NE of a supply function equilibrium is obtained properly by using proposed solution technique. The MSU made by MO is compared with that by each genco and that under perfect competition market.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1998년도 봄 학술발표회 논문집
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• pp.60-67
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• 1998

This paper deals with the development of a variable-node element and its application to the adaptive h-version mesh refinement-recovery for the incompressible viscous flow analysis. The element which has variable mid-side nodes can be used in generating the transition zone between the refined and unrefined elements and efficiently used for construction of a refined mesh without generating distorted elements. A modified Gaussian quadrature is needed to evaluate the element matrices due to the discontinuity of derivatives of the shape functions used for the element. The penalty function method which can reduce the number of independent variables is adopted for the purpose of computational efficiency and the selective reduced integration is carried out for the convection and pressure terms to preserve the stability of solution. For the economical analysis of transient problems, not only the mesh refinement but also the mesh recovery is needed. The numerical examples show that the optimal mesh for the finite element analysis of a wind around the structures can be obtained automatically by the proposed scheme.

• Journal of the Korean Data and Information Science Society
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• 제23권4호
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• pp.797-805
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• 2012

Many circular distributions are known to be not only asymmetric but also bimodal. Hidden truncation method of generating asymmetric distribution is applied to a bivariate circular distribution to generate an asymmetric circular distribution. While many other existing asymmetric circular distributions can only model an asymmetric data, this new circular model has great flexibility in terms of asymmetry and bi-modality. Some properties of the new model, such as the trigonometric moment generating function, and asymptotic inference about the truncation parameter are presented. Simulation and real data examples are provided at the end to demonstrate the utility of the novel distribution.

• 전기학회논문지
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• 제67권5호
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• pp.680-687
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• 2018

Because of its predictability of the energy cycle and huge scale power output, the ocean energy from tidal power utilization has always received attention as a great energy source, even though its development cost, including the embankment construction, is so much higher than that of any other energy source. Nevertheless, nowadays many projects are being planned on account of institutional support from the government and the recent advance of construction technology. In Korea, the new industry field operating and managing the tidal power plant has already opened. But we are facing a number of problems for optimal operation of tidal power plant that are a lack of operation experience and a skill of professional management and others. This paper suggests a novel way to determine the starting head of power generation by generating power comparison method For this new method, the paper discusses many factors including changing the volume of the basin, the number of operating turbines and gates and forecasting the tidal amplitude and the characteristic curve of turbine and gate. Finally we verified that it can increase about 2% an annual power generation compared with the conventional method using the original operational function made in the plant design process.

• 한국정보통신학회논문지
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• 제7권4호
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• pp.767-778
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• 2003

이 논문은 유전자 알고리즘을 이용한 최적의 퍼지 규칙을 만드는 방법을 제시한다. 퍼지 규칙은 첫 번째 단계에서 학습 데이터를 이용해 생성된다. 이 단계에서 퍼지 c-Means 군집화 알고리즘과 군집 유효성을 사용해 구조를 결정하고 퍼지 규칙 수가 되는 군집 수를 결정한다. 첫 번째 단계에서 구조가 결정되면 퍼지규칙의 매개변수들은 유전자 알고리즘을 이용해서 조율된다. 또한, 비대칭 가우시안 소속 함수를 위해 분산 매개변수는 좌ㆍ우값을 따로 관리하여 조율한다. 이 방법은 가중치와 분산 공간에서 유전자 알고리즘을 사용함으로서 전역 최소 쪽으로 수렴하도록 한다.

• International Journal of Contents
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• 제12권4호
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• pp.31-44
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• 2016

Knowledge creation and management are regarded as critical success factors for an organization's survival in the knowledge era. As a process of knowledge acquisition and sharing, organizational learning mechanisms (OLMs) guide the learning function of organizations represented by its different learning activities. We examined a variety of learning processes that constitute OLMs. In this study, we aimed to capture the process and framework of OLMs and knowledge sharing and acquisition. Factors facilitating OLMs were investigated at three levels: individual, group, and organizational. The concept of an OLM has received some attention in the field of organizational learning, however, the relationship among the factors generating OLMs has not been empirically tested. As part of the ongoing discussion, we attempted a systemic approach for OLMs. OLMs can be represented by factors that are inherent to the organization's system; therefore, prior to empirically testing the OLM generating factor(s), evaluation of its organizational integration is required to determine effective treatment of each factor. Thus, we developed a framework to manage knowledge and proposed a method to numerically evaluate factors influencing the OLMs. Specifically, composite importance (CI) of the Decision-Making Trial and Evaluation Laboratory (DEMATEL) method was applied to explore the interaction effect of these factors based on systemic approach. The augmented matrix thus generated is expected to serve as a stochastic matrix of an absorbing Markov chain.