• 한국음향학회지
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• 제29권4호
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• pp.243-250
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• 2010

본 논문에서는 해금 소리의 시간에 따른 변화를 사실적으로 묘사하기 위해 캡스트럼 분석을 이용한 전통 악기 해금의 스펙트럼 모델링을 제안한다. 정확한 캡스트럼 분석 결과를 얻기 위해 프레임 사이즈는 입력 신호의 3주기로 하였고 포만트 추출에 더 많은 캡스트럼 계수를 활용하였다. 정현파 성분 합성 과정에서 대역통과 필터의 차단주파수를 공명점 별로 유동적으로 조절하고 노이즈 성분에 남아있는 피크 성분들을 제거하는 과정을 추가하여 성능을 향상시켰다. 음 높이의 변화를 판단하기 위해 입력 프레임을 묵음구간, 어택구간, 지속구간으로 분류하였고 기본주파수에 따라 프레임 사이즈를 가변적으로 조절하였으며 지속구간에서의 기본주파수 검출 오류를 수정함으로써 정확도를 향상시켰다. 해금 연주 전문가의 청취테스트를 통해 원음과 합성음이 96~100 % 유사하다는 평가 결과를 얻었다.

• 산업공학
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• 제24권3호
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• pp.187-195
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• 2011

The automatic radiopharmaceutical module consists of several 2-way valves, couple of syringes, gas supply unit, heating(cooling) unit and sensors to control the chemical reagents as well as to help the chemical reaction. In order to control the actuators of radiopharmaceutical module, the process is tabulated using spread sheet as like excel. Unlike the common program, a trivial error is too critical to allowed in the process because the error can lead to leak the radioactive reagent and to cause the synthesis equipment failure during synthesizing. Hence, the synthesis process has been validated using graphic simulation while the operator checks the whole process visually and undergoes trial and error. The verification of the synthesis process takes a long time and has a difficulty in finding the error. This study presents a methodology to verify the process algebraically while the radiopharmaceutical module is converted to the network model. The proposed method is validated using actual synthesis process.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1987년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 16-17 Oct. 1987
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• pp.300-306
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• 1987

This paper deals with a modeling of manufacturing system and a model analysis by a SIMAN language. A flow of production process is analyzed, and a mathematical model on the basis of the analyzed data is simulated by a SIMAN language. An object of this study is to achieve an optimization of production a reduction of cost, and an improvement of quality by a applicable line-balancing technique and an optimization technique in a real factor induced an analysis and synthesis of the result of simulation.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1990년도 가을 학술발표회 논문집
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• pp.40-46
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• 1990

This paper introduces a geometric modelling system adopted in a newly developed preprocessor for finite element analysis of three dimensional structures. The formulation is characterized by hierarchical construction of structural model which consists of control points, curves, surfaces and solids. Various surface and solid modeling schemes based on blending functions and boundary representation are systematized for finite element mesh generation. The modeling system is integrated with model synthesis and operations which facilitate modelling of complex structures.

• 한국컴퓨터그래픽스학회논문지
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• 제15권1호
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• pp.25-34
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• 2009

사운드는 가상현실 및 컴퓨터 애니메이션에서 사용자의 현실감 및 집중도를 높이기 위한 중요한 요소이다. 최근에 컴퓨터 그래픽스 분야에서도 연구자들이 사운드 관련 연구들에 관심을 가지고 여러 컴퓨터 그래픽스 학술지와 학회에 주목할만한 연구결과들이 발표되고 있다. 본 논문에서는 컴퓨터 그래픽스 분야에서 소개된 논문들을 중심으로, 컴퓨터 그래픽스에서 관심을 가지는 사운드 연구의 주제에 대하여 알아보고 중요성을 가지는 논문들을 소개한다. 특히 본 논문에서는 다음 두 가지 분야의 논문들을 소개한다. 첫째, 사운드를 물리적으로 합성함으로써 그래픽스의 물리 법칙에 동기화되는 사운드를 생성하는 것이다. 둘째, 음원에서 나오는 사운드가 사람에게 들리는 음향적 환경을 모델링하는 것이다. 사운드에 대한 연구에서 주된 관심은 이러한 음향학적인 물리법칙을 더욱 효율적으로 모델링하여 적은 자원으로도 실제적인 사운드 효과를 발생할 수 있는지에 대한 것이다. 이러한 관점을 중점으로 다양한 사운드 관련 논문들을 살펴보고 컴퓨터 그래픽스와의 관계를 살펴보도록 한다.

• 한국음향학회:학술대회논문집
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• 한국음향학회 1994년도 FIFTH WESTERN PACIFIC REGIONAL ACOUSTICS CONFERENCE SEOUL KOREA
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• pp.893-898
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• 1994

In this paper, the influence of voice source estimation and modeling on speech synthesis and coding is examined and then their new estimation and modeling techniques are proposed and verified by computer simulation. It is known that the existing speech synthesizer produced the speech which is dull and inanimated. These problems are arised from the fact that existing estimation and modeling techniques can not give more accurate voice parameters. Therefore, in this paper we propose a new voice source estimation algorithm and modeling techniques which can not give more accurate voice parameters. Therefore, in this paper we propose a new voice source estimation algorithm and modeling techniques which can represent a variety of source characteristics. First, we divide speech samples in one pitch region into four parts having different characteristics. Second, the vocal-tract parameters and voice source waveforms are estimated in each regions differently using sequential SVD. Third, we propose composite source model as a new voice source model which is represented by weighted sum of pre-defined basis functions. And finally, the weights and time-shift parameters of the proposed composite source model are estimeted uning EM(estimate maximize) algorithm. Experimental results indicate that the proposed estimation and modeling methods can estimate more accurate voice source waveforms and represent various source characteristics.

• 한국세라믹학회지
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• 제32권7호
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• pp.817-824
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• 1995

TiB2 was simultaneously synthesized and densified with concurrent self-propagating high-temperature synthesis and direct contact-heating by electrcial power input and pressure. Density of TiB2 synthesized by self-propagating high-temperature synthesis and consolidated simultaneously by direct contact-heating and pressure was maximum 80% of the theoretical density (4.52g/㎤). Temperature profile was analyzed by solving heat balance equation with numerical method (FTCS method). The temperature of the sample was sufficiently raised to that temperature sufficient to be densified. It was ascertained that the density of the SHS synthesized TiB2 is exponentially proportinal to the input thermal energy per mass.

• 한국군사과학기술학회지
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• 제16권2호
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• pp.207-213
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• 2013

An infrared image synthetic method is proposed for infrared system simulation. The synthesis image uses a background IR image captured from real scene and a target IR modeling image. The radiances related with maximum and minimum temperatures of the background and target images are calculated from the Planck's blackbody equation. Based on them, the background and target images are compensated and synthesized. The proposed method is simulated and the IR target images are generated by RadThermIR software.

• Journal of information and communication convergence engineering
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• 제6권4호
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• pp.383-390
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• 2008

Clock skew modeling is important in the performance evaluation and prediction of clock distribution network and it is one of the major constraints for high-speed operation of synchronous integrated circuits. In clock routing synthesis, it is necessary to reduce the clock skew under the specified skew bound, while minimizing the cost such as total wire length and delay. In this paper, a new efficient bounded clock skew routing method is described, which generalizes the well-known bounded skew tree method by allowing loops, i.e., link-edges can be inserted to a clock tree when they are beneficial to reduce the clock skew and/or the wire length. Furthermore, routing topology construction and wire sizing is used to reduce clock delay.

• Applied Science and Convergence Technology
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• 제27권1호
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• pp.14-18
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• 2018

In order to understand the mechanism of the synthesis of particles using a plasma torch, it is necessary to understand the reaction mechanisms using a computer simulation. In this study, we have developed a simulation method to combine the Lagrangian scheme to follow microparticles and a nodal method to treat nanoparticles categorized with different particle sizes. The Lagrangian scheme includes the Coulomb force which affects the dynamics of larger particles. In contrast, the nodal method is adequate for the nanoparticles because the charge effect is negligible for nanoparticles but the number of nanoparticles is much larger than that of microparticles. This method is helpful to understand the dynamics and growth mechanism of micro- and nano-powder mixture observed in the experiment.