• 한국산업정보학회:학술대회논문집
• /
• 한국산업정보학회 2008년도 추계 공동 국제학술대회
• /
• pp.463-467
• /
• 2008

Heuristic optimization using hybrid algorithms have provided a robust and efficient approach for solving many optimization problems. In this paper, a new hybrid algorithm using adaptive genetic algorithm (aGA) and particle swarm optimization (PSO) is proposed. The proposed hybrid algorithm is applied to solve numerical optimization functions. The results are compared with those of GA and other conventional PSOs. Finally, the proposed hybrid algorithm outperforms others.

• Journal of electromagnetic engineering and science
• /
• 제8권4호
• /
• pp.139-143
• /
• 2008

In this paper, a new scheme to calculate the weighting factor of the 2-D isotropic-dispersion finite difference time domain(ID-FDTD) is proposed. The weighting factor in [1] was formulated in free space, so that it may not be optimal in dielectric media. Therefore, the weighting factor was reformulated by considering the material properties and using the least mean square method. As a result, a minimum numerical dispersion error for any dielectric media is guaranteed.

• Journal of information and communication convergence engineering
• /
• 제8권4호
• /
• pp.457-460
• /
• 2010

we have analyzed tens of Giga pulse signal generation using sideband injection locking scheme. The numerical model for semiconductor lasers under the strong optical injection is based on the Lang's equation and has been extended in order to take into account the simultaneous injection of the multiple sidebands of the current-modulated laser. The numerical simulation results show that the unselected sidebands will affect the optical and RF-spectral characteristics even though the semiconductor laser is locked to the target sidebands.

• Journal of the Korean Data and Information Science Society
• /
• 제17권3호
• /
• pp.687-705
• /
• 2006

In this paper we consider GPH distribution that is defined as a distribution for sum of random number of random variables following exponential distribution. We establish approximation process of general distributions to GPH distributions and offer numerical results for various cases to show the accuracy of the approximation. We also propose analysis method of delay distribution of queueing systems using approximation to GPH distributions and offer numerical results for various queueing systems to show applicability of GPH approximation.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2005년도 춘계종합학술대회
• /
• pp.435-437
• /
• 2005

본 연구에서는 OCT 시스템에서 얻어지는 신호를 바탕으로 글루코스를 측정하는 방법을 제안하고 측정에 대한 정확도 등을 시뮬레이션을 통해서 검증하였다.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2005년도 춘계종합학술대회
• /
• pp.343-345
• /
• 2005

본 연구에서는 OCT 시스템에서 얻어지는 신호를 바탕으로 글루코스를 측정하는 방법을 제안하고 측정에 대한 정확도 등을 시뮬레이션을 통해서 검증하였다.

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• 제7권2호
• /
• pp.51-64
• /
• 2003

Analysis is given of construction and stability of complex symmetric analogues of Householder matrices, with applications to the eigenproblem for such matrices. We investigate numerical properties of the deflation of complex symmetric matrices by using complex symmetric Householder transformations. The proposed method is very similar to the well-known deflation technique for real symmetric matrices (Cf. [16], pp. 586-595). In this paper we present an error analysis of one step of the deflation of complex symmetric matrices.

• Current Optics and Photonics
• /
• 제5권6호
• /
• pp.597-605
• /
• 2021

An extended Fourier modal method (FMM) for optical dipole radiation in three-dimensional photonic structures is proposed. The core elements of the proposed FMM are the stable bidirectional scattering-matrix algorithm for modeling internal optical emission, and a novel optical-dipole-source model that prevents numerical errors induced by the Gibbs phenomenon. Through the proposed scheme, the FMM is extended to model a wide range of source-embedded photonic structures.

• 한국전자통신학회논문지
• /
• 제11권4호
• /
• pp.427-432
• /
• 2016

수치에 있어서 기억법은 숫자를 기억하는데 유용하다. 이러한 숫자와 관련된 기억법에서 점, 선, 막대 등과 같은 많은 방법들을 적용한 그래프나 이미지는 상당히 훌륭한 연상 기호의 역할을 한다. 수치와 관련된 기억법은 뇌가 원래의 형태보다 더 보유 할 수 있는 방법으로 정보를 변환하는 것과 관련된다. 이 연구의 이전 연구를 되짚어보면 수치 기억법과 관련하여 단순 그래프 알고리즘과 배열된 이미지 알고리즘을 제시했었다. 본 연구에서는 모바일 환경에서 이전 연구의 알고리즘을 적용하기 위해 기억법 기반 수치 정보 시스템을 구현하고 평가한다.

• 유통과학연구
• /
• 제17권7호
• /
• pp.87-98
• /
• 2019

Purpose - The goal of this research is to examine the influence of Quick Response on the supply chain performance. Furthermore, this study investigates the potential of Quick Response to be a more advanced form of supply chain collaboration program with extensive information sharing activities. Research design, data, and methodology - The mathematical model is developed to represent the two stage supply chain system with a single manufacturer and one retailer. In the numerical study with the proposed mathematical models, three supply chain systems including the traditional system, Quick Response, and the fully shared information system are compared in terms of their profits. Results - The numerical analysis shows both manufacturer and retailer obtain greater profits under Quick Response than in the traditional system. While the fully shared information outperforms Quick Response as well as the traditional system, it results in lower manufacturer's profit compared with Quick Response. Conclusions - According to the numerical examples, Quick Response is the effective supply chain collaboration program that is beneficial to every supply chain member. The fully shared information system, as a more advanced form of collaboration than Quick Response can bring more benefits to the whole supply chain system, but it is necessary to prepare the proper incentive program that enables every member to share its benefits equally.