• 한국멀티미디어학회논문지
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• 제7권12호
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• pp.1700-1707
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• 2004

Nowaday, market size of digital image in world around is looks to rapidly growth. For this, Texture mapping has traditionally been used to add realism to computer graphics images. Therefore to make our image realistic, we need to give the various kind of objects material parameter and environment lighting. To present the completed marble we use passing back algorithm and combination with channel of a material. In experimental result of this paper that application by passing back algorithm and varying the parameter such as scale, period, distortion, octaves of noise make showing the superiority of optimized rendering of spheres and perfect another marble effects.

• 산업경영시스템학회지
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• 제22권50호
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• pp.33-44
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• 1999

This paper describes the Autonomous Vehicles (AV) which are operated for their own tasks. There are chances of conflict resolution such as sharing the same path which can lead to the risk of a collision. This research represents some ways of negotiating the conflict resolution by generating cooperative actions. Negotiation while traveling the path is accomplished by using priority and by announcing the start time of the task. When there is a risk of collision, the AV tries to dissolve the situation of conflict resolution by concurrently adjusting mutual speed and by performing the algorithm of passing. If the speed of the AV cannot be adjusted, it measures the distance between the counterpart of the AV and an obstacle along the path. Then it judges either to proceed by passing the counterpart of the AV or to turn back after observing the current circumstances. The performance of the algorithm described above was proven by a simulator.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 추계학술대회 논문집
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• pp.683-686
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• 2002

It is fundamental to count and pack the pills in the medicine manufacture field but those tasks are time and labor consuming. Thus, the need fur automation of those tasks is necessarily getting increased in order to get effective mass production. It Is significant to perceive pills quickly and precisely. There were many trials for this processing but the performance of the existing counting machines varies about size, shape and dispersion tendency of pills. In this paper, the authors try to improve the counting performance of a pill counting machine that has optical sensors with the neural network. The passing signal of pill is acquired with optical sensor and the passage signal of the pill is extracted as input patterns. The gradient and integration of signal during passing time and the time keeping the pill interrupt the light from the LED are used as characteristic feature. The back propagation and perception algorithm are used for training. Experimental results with several pills show that the designed algorithm is a little bit effective to reduce the noise effect which is generated from interference among the machine components and unreliable environment.

• Journal of electromagnetic engineering and science
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• 제10권3호
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• pp.166-170
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• 2010

To numerically calculate electromagnetic scattering from the electrical-large three-dimensional(3D) objects, the high-frequency approaches have been usually applied, but the accuracy and feasibility of these geometrical and physical optics(GO-PO) approaches, to some extent, are remained to be improved. In this paper, a new framework is developed for calculation of the near-field scattering field of an electrical-large 3D target by using a multilevel fast multipole algorithm(MLFMA) and generation of radar images by using a fast back-projection(FBP) algorithm. The MPI(Message Passing Interface) parallel computing is carried out to multiply the calculation efficiency greatly. Finally, a simple example of perfectly electrical conducting(PEC) patch and a canonical case of Fighting Falcon F-16 are presented.

• 한국음향학회지
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• 제21권6호
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• pp.543-551
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• 2002

이 논문에서는 20,000 단어급의 대어휘를 대상으로 실시간 연속음성 인식을 수행할 수 있는 탐색 방법을 제안한다. 기본적인 탐색 방법은 토큰 전파 방식의 비터비 (Viterbi) 디코딩 알고리듬을 이용한 1 패스로 구성된다. 언어 모델 네트워크를 도입하여 다양한 언어 모델들을 일관된 탐색 공간으로 구성하도록 하였으며, 프루닝(pruning) 단계에서 살아남은 토큰들로부터 동적으로 탐색 공간을 재구성하였다. 용이한 후처리를 위해 워드그래프 및 N개의 최적 문장을 출력할 수 있도록 비터비 알고리듬을 수정하였다. 이렇게 구성된 디코더는 20,000 단어급 데이터 베이스에 대해 테스트하였으며 인식률 및 RTF측면에서 평가되었다.

• 한국컴퓨터정보학회논문지
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• 제16권8호
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• pp.137-146
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• 2011

에너지 소모에 대한 증가되는 소비자의 관심을 지원하기 위하여 가전기기의 에너지 모니터링과 예측 방식을 제안한다. 제안한 시스템은 0.5초마다 전류 센서를 지나가는 전류량을 측정하는 스마트 플러그라는 일반 전기 콘센트로 설계하고, 신경회로망의 훈련과 시험 데이터를 얻기 위해 평균기온, 최저기온, 초고기온, 습도, 일조시간의 날씨 정보를 입력 데이터로 사용하고, 스마트 플러그를 통한 전기 사용량을 목표값으로 사용하였다. 훈련을 위한 실험데이터를 사용하여 역전파 알고리즘을 기반으로 한 신경회로망을 구성하였다. 입력과 출력 데이터의 비선형 매핑을 위해 다층신경회로망을 사용하였다. 제안한 신경회로망 모델은 상관관계 계수가 0.9965로 우수하게 전기 사용량을 예측할 수 있는 것을 확인하였으며, 예측의 평균 제곱 오차는 0.02033이다.

• Journal of applied mathematics & informatics
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• 제11권1_2호
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• pp.305-316
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• 2003

Recently, an iterative algorithm for finding the interior eigenvalues of a definite matrix by CG-type method has been proposed. This method compares to the inverse power method. The given matrices A, and B are assumed to be large and sparse, and SPD( Symmetric Positive Definite) The CG scheme for the optimization of the Rayleigh quotient has been proven a very attractive and promising technique for large sparse eigenproblems for smallest eigenvalue. Also, it is very amenable to parallel computations, like the CG method for the linear systems. A proper choice of the preconditioner significantly improves the convergence of the CG scheme. But for parallel computations we need to find an efficient parallel preconditioner. Our candidates we ILU(0) in the wave-front order, ILU(0) in the multi-coloring order, Point-SSOR(Symmetric Successive Overrelaxation), and Multi-Color Block SSOR preconditioner. Wavefront order is a simple way to increase parallelism in the natural order, and Multi-coloring realizes a parallelism of order(N), where N is the order of the matrix. Another choice is the Multi-Color Block SSOR(Symmetric Successive OverRelaxation) preconditioning. Block SSOR is a symmetric preconditioner which is expected to minimize the interprocessor communication due to the blocking. We implemented the results on the CRAY-T3E with 128 nodes. The MPI (Message Passing Interface) library was adopted for the interprocessor communications. The test problem was drawn from the discretizations of partial differential equations by finite difference methods. The results show that for small number of processors Multi-Color ILU(0) has the best performance, while for large number of processors Multi-Color Block SSOR performs the best.