• Proceedings of the Korean Information Science Society Conference
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• 2006.10b
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• pp.586-589
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• 2006

순수 함수형 언어에서 예외처리를 구현하는 것은 매우 까다로운 문제이다. 지연계산, 참조투명성과 같은 주요 특징은 예외 처리와 상반된 성질을 가지는 때문이다. 예외의 처리순서는 계산순서와 관계가 있고, 예외의 발생순서는 참조투명성과 밀접한 관계가 있다. 본 논문은 현재 하스켈(Haskell)에서 구현된 예외처리 방법의 분석을 통해, 프로그램 수행 시 효율적인 예외처리 방법에 대해서 제시한다. 합성된 프로그램에서 예외 발생할 때 예외가 전달되는 것을 사전에 차단하는 방법을 이용한다. 실제 예외가 발생한 프로그램을 작성하고, 프로파일링을 통하여 이 방법의 효율성을 점검한다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.835-837
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• 2005

최근 얼굴 인식은 사용자의 편의성을 포함한 다양한 장점으로 인하여 생체 인식 시장에서 주요 기술로 대두되고 있다. 그러나 조명 변화에 기인한 얼굴 인식 성능의 저하는 실용화에 걸림돌이 되고 있는 실정이다. 따라서 조명 변화에 따른 얼굴의 외형 변화를 분석하는 연구들이 세계적으로 활발히 진행되고 있다. 그러나 기존 방법들은 다수의 등록 영상이나 조명에 대한 사전 정보가 필요하거나 실시간으로 구현되기 어렵기 때문에 실용 시스템에 적용하기는 어려운 실정이다. 따라서, 본 논문에서는, 여러 조명 영상들로 구성된 학습 데이터를 이용하여, 조명에 대한 정보가 없는 한 장의 입력 영상을 분석하는 방법을 제안한다. 제안된 방법은 SVDD를 이용하여 학습 데이터의 여러 조면 영상들로부터 입력 영상의 조명과 같은 대표영상을 합성하고 이 대표영상들의 선형 조합을 이용하여 입력 영상을 표현한다. 제안 방법의 효율성을 검증하기 위하여 공인 얼굴 데이터베이스들을 이용하여, 기존 방법들과 비교 실험을 수행하였으며, 조명 변화가 큰 영상에서도 안정된 조명 변화의 분석이 가능하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.12 no.8
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• pp.3842-3855
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• 2018

A novel image completion method is proposed that uses the advantage of planar structural information to fill corrupted portions of an image. First, in estimating parameters of the projection plane, the image is divided into several planes, and their planar structural information is analyzed. Second, in calculating the a priori probability of patch and patch offset regularity, this information is converted into a constraint condition to guide the process of filling the hole. Experimental results show that the proposed algorithm is fast and effective, and ensures the structure continuity of the damaged region and smoothness of the texture.

• Proceedings of the KIEE Conference
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• 2002.07d
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• pp.2454-2456
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• 2002

Since articuratory synthesis models the human vocal organs as precise as possible, it is potentially the most desirable method to produce various words and languages. This paper proposes a new type of an articulatory synthesizer using Mermelstein vocal tract model and Kelly-Lochbaum digital filter. Previous researches have assumed that the length of the vocal tract or the number of its cross sections dose not vary while uttering. However, the continuous utterance can not be easily implemented under this assumption. The limitation is overcomed by "Buffer Rearrangement" for dynamic vocal tract in this paper.

• Annual Conference on Human and Language Technology
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• 2007.10a
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• pp.254-260
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• 2007

음성은 컴퓨터로 대변되는 기계와 사람 그리고 기계를 매개로 한 사람과 사람의 상호작용에서 가장 쉽고 직관적인 인터페이스로 널리 활용되고 있다. 인간에게 음성정보를 제공하는 음성합성 분야에서는 합성결과의 자연스러움과 인식성이 시스템의 주요 평가요소로 활용되고 있는데 이러한 자연스러움과 인식성은 합성결과의 정확성뿐만 아니라 발화환경이나 발화자의 발화특징 혹은 감정상태 등에 의해 많은 영향을 받게 된다. 담화표지는 문장의 명제 내용에는 직접 관여하지 않으면서 화자의 발화 의도나 심리적 태도를 전달하는 구성 요소를 말하는데 본 논문에서는 담화표지가 포함된 대화 음성 데이터를 수집하여 담화표지의 음성언어적인 특징을 분석하고 분석된 결과를 음성합성 시스템에 활용하는 표현방식에 대해 논의한다.

• Bulletin of the Korean Chemical Society
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• v.31 no.1
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• pp.87-91
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• 2010

For the discovery of new antivirals against Severe Acute Respiratory Syndrome-coronavirus (SARS-CoV), we prepared and evaluated several benzoquinoline compounds as its 3C-like protease (3CLpro) inhibitors. Based on the computer modeling study that each of the two rigid benzoquinolinone and N-phenoltetrazole moieties of the compound 1 is bound to the S1 and S2 sites, respectively, of the SARS protease by forming H-bonds and hydrophobic interactions, we designed and synthesized alkylated benzoquinolines at both the sites of the hydroxyl groups. We found that the compound 2a showed five times higher inhibiting activity against the 3CLpro compared to the compound 1.

• The Journal of the Acoustical Society of Korea
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• v.18 no.4E
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• pp.26-30
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• 1999

This paper introduces a prosodic phrasing method in Korean to improve the naturalness of speech synthesis, especially in text-to-speech conversion. In prosodic phrasing, it is necessary to understand the structure of a sentence through a language processing procedure, such as part-of-speech (POS) tagging and parsing, since syntactic structure correlates better with the prosodic structure of speech than with other factors. In this paper, the prosodic phrasing procedure is treated from two perspectives: dependency parsing and prosodic phrasing using dependency relations. This is appropriate for Ural-Altaic, since a prosodic boundary in speech usually concurs with a governor of dependency relation. From experimental results, using the proposed method achieved 12% improvement in prosody boundary prediction accuracy with a speech corpus consisting 300 sentences uttered by 3 speakers.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1994.03a
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• pp.7-34
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• 1994

;Recently the sheet forming simulation technology revealed great progress in the sense of practical application in the automotive, electric/electronics and aviation/space industries. The goal of sheet forming simulation is to embedded in the design engineering system which is consisted by the analysis and synthesis modules. This design simulation system predicts the slackness of sheet and estimate the formability, and search the optimum material/forming/structure conditions. This OVER-ALL OPTIMUM DESIGN can be classified as follow; 1. ANALYZING PROCEDURE: Numerical simulation based on nonlinear theories -geometry, material and friction nonlinearities- 2. OPTIMIZATION PROCEDURE: Optimum design based on mathematical programing and AI technologies, those are implemented in CAD/CAM/CAE System - Concurrent Engineering System-. In this paper, four subjects will be discussed; (1) State of arts of computer simulation technologies in Japan. (2)History of sheet forming simulation. (3) Benchmark problems. (4) Future technology in the sheet forming simulation.ation.

• Journal of the Korea Society of Computer and Information
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• v.23 no.10
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• pp.95-101
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• 2018

In this paper, we propose an image-based synthesis method that can effectively represent the spark effect in fire simulation. We use the real flame image or animated image as inputs and perform the following steps : 1) extract feature vectors from the image, 2) calculate artificial buoyancy, and 3) generate and advect spark textures. We detect the edge from images and then calculate the feature vectors to calculate the buoyancy. In the next step, we compute the high-quality buoyancy vector field by integrating the two-dimensional feature vector and the fluid equation. Finally, the spark texture is advect by buoyancy field. As a result, our method is performed much faster than the previous approach and high-quality results can be obtained easily and stably.

• Journal of the Korea Society of Computer and Information
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• v.3 no.4
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• pp.63-69
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• 1998

The area optimization of the power distribution network is an important problem in the layout design of VLSI systems. In this paper we propose noval methods to solve the problem of designing minimal area power distribution nets, while satisfying voltage drop and electromigration constraints. We propose two novel greedy heuristics for power net design-one based on bottom-up tree construction using greedy merging and the other based on top-down linearly separable partitioning.