• 전자통신동향분석
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• 제8권2호
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• pp.69-91
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• 1993

In the conventional speech processing, the technique of FFT(Fast Fourier Transform) is usually applied to the finite number of samples within the window of specified length using the fixed sampling rate. In this case, the temporal resolution is dependent upon the length of window while the spectral resolution is dependent upon the number of samples within the window. Thus, once the temporal resolution is determined the spectral resolution is also determined or vice versa. To resolve this type of dilemma, a new type of bank-filter similar to the characteristics of cochlear model needs to be considered. Furthermore, wide dynamic range of cochlea certainly helps the stable extraction of speech features. In the paper, the human auditory system will be briefly introduced and previous works on auditory preprocessors based on cochlear model will be reviewed. As a conclusion, the design considerations of auditory preprocessors based on cochlear model will be addressed.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권12호
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• pp.1209-1213
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• 2010

최근 모바일 장치의 기능이 발전하면서, 스마트폰에 대한 관심이 증가하고 있다. 스마트폰은 휴대성이라는 장점을 가지고 있음에도 불구하고, 그 기기의 크기가 작아 사용자 인터페이스 관점에서 불편함이 많이 있었다. 본 논문에서는 이 문제점올 해결하기 위해 안드로이드 모바일 플랫폼에서의 프레임버퍼 구조를 수정하여, 동적으로 해상 전환시켜 크기가 큰 외부 디스플레이 장치로 디스플레이를 전환하고, 기존의 휴대폰은 리모콘으로 활용할 수 있는 사용자 인터페이스 전환 기술을 개발하였다.

• Architectural research
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• 제14권1호
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• pp.3-9
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• 2012

Owing to the advent of ubiquitous computing technologies, the concept of Intelligent Environments has emerged, as an alternative approach to overcome the limitation of the built environment. Intelligent Environments can be more responsive to user-and context-specific human activities by automatically and dynamically modifying their settings without explicit human intervention. However, the conventional approach to the development of Intelligent Environments has mainly focused on the technical issues without paying much attention to the dynamic interrelationship between the user and the built environment. Therefore, differing or conflicting needs of multiple simultaneous users remain unresolved. The objective of this study is to present types of environmental conflicts and their resolution through agent collaboration and negotiation. For the demonstration and validation of the conflict resolution process, a set of hypothetical test cases is simulated in a 3D test environment. The result of the case simulations shows that the proposed approach is computationally feasible and applicable to the development of Intelligent Environments, and, furthermore, it can overcome the drawback of the conventional approach.

• 제어로봇시스템학회논문지
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• 제14권6호
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• pp.587-594
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• 2008

In this paper, an efficient integer ambiguity resolution method for GNSS attitude determination system is described. The proposed method solves the integer least-squares with quadratic equality constraints(ILSQE) problem and shows an expansion of the LAMBDA method can be used to solve it. The solution of ILSQE is shown and an efficient implementation with a LAMBDA based method is given. The method is compared with some other methods. The results of static and dynamic tests show the dramatic improvement of the success rates of integer ambiguity resolution.

• 한국언어정보학회지:언어와정보
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• 제12권1호
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• pp.1-26
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• 2008

This paper proposes a dynamic approach to anaphoric resolution in conjunction phrases, in terms of Discourse Representation Theory. Unlike Kamp, van Genabith, and Reyle (forthcomming)'s analysis, it proposes two different types of discourse representation structures for conjunction phrases; one for coordinate phrases such as and conjunction phrases and the other one for subordination conjunction phrases such as when subordination phrases. Following Chung (1992), Chung (2004), every element is processed in the order of occurrence and conjunction operators in a non-sentence-initial position cause the ongoing DR to split in two with the same index. DRS conditions and accessibility are accordingly modified so that DRs for conjunction clauses can be accessible from DRs for main clauses.

• 대한의용생체공학회:의공학회지
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• 제22권4호
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• pp.321-330
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• 2001

In this paper, we propose a new synthetic aperture focusing scheme for improving the lateral resolution which is one of the most important factors determining the quality of ultrasound imaging. The proposed scheme enables full round-trip dynamic focusing with approximately limited property. This properties are obtained through transmitting plane waves of which the traveling angle varies with the receive subaperture position, as opposed to stepping the spherical wave source across an array in other synthetic aperture focusing schemes, and employing dynamic focusing in receive. In this paper, the properties of the proposed scheme is analyzed in which a hypothetical infinite line source is used to transmit the plane waves and verified through computer simulation results. Also, we show that the proposed scheme is realizable with an array transducer with a finite aperture size. In summary, it is shown through comparison between the field contours of the proposed scheme and the conventional scheme that the proposed scheme can improve greatly the lateral resolution of ultrasound imaging.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권5호
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• pp.358-363
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• 2000

In this paper, a voltage equations, a thrust force equations and kinetic equation are derived from the basic structure of a 2-phase hybrid type linear stepping motor(HLSM). And a micro-stepping method in order to eliminate effectively the resonant phenomena and to increase the positional resolution of the HLSM was proposed. The proposed micro-stepping method can divide one step into the maximum 128 micro-steps under simple control system. The dynamic characteristics of proposed micro-stepping method were analyzed by the ACSL(Advanced Continuous Simulation Language) with the voltage equations, the thrust force equations and the kinetic equation, and were measured by laser experimental system. As the result, the justice of theory was confirmed, and the resonant phenomena, the positional resolution and dynamic thrust were improved by the proposed micro-stepping method.

• 한국해안·해양공학회논문집
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• 제35권5호
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• pp.95-101
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• 2023

최근 지속적인 연안개발로 여가활동 장소 확대 및 접근성 증가를 가져왔으나, 그에 따른 안전사고도 증가 하였다. 이러한 사고 요인은 인위적인 유형과 자연적인 유형으로 분류되며, 후자는 파도, 조석, 해무 및 바람 등 동적 요소로 구성된다. 기상청, 국립해양조사원 등 기관들은 이미 동적 요소 정보를 제공하고 있지만, 그 해상도가 낮아 국지적 위험도를 정밀하게 평가하기 어려운 한계를 가지고 있다. 본 연구에서는 이러한 한계를 극복하기 위해 기존 오픈시스템의 동적 정보를 활용하여 높은 해상도의 수치 시뮬레이션을 구축하였고, 이를 통해 국지적인 연안활동 장소의 동적요소를 예측하는 자동화 모듈을 개발하였으며, 특히 모듈 구축 중 핵심인 수치예측 파랑 결과값과 파고 관측값을 비교검토 하였다.

• 한국컴퓨터정보학회논문지
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• 제28권12호
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• pp.89-96
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• 2023

본 논문에서는 GPU기반으로 옷감을 찢는 데 필요한 동적 재메싱를 실시간으로 처리할 수 있는 방법을 제안한다. 얇은 쉘 재질은 물리 기반 시뮬레이션/애니메이션, 게임, 가상현실 등 다양한 분야에서 활용되고 있다. 옷감을 찢는 것은 기하학과 연결 구조를 동적으로 갱신해야 되기 때문에 그 처리 과정이 복잡하고 계산양이 크다. 특히 인터랙티브 콘텐츠를 다루는 분야에서는 이 과정이 빠르게 수행되어야 한다. 대부분의 방법에서는 실시간을 유지하기 위해 저해상도 시뮬레이션을 통해 재메싱을 수행하거나 이미 분할된 패턴을 그대로 이용하기 때문에 동적 재메싱이라고 보기 어려우며, 찢어진 패턴의 품질이 낮다. 본 논문에서는 GPU에 최적화된 동적 재메싱 알고리즘을 새롭게 제안함으로써 고해상도 옷감 찢어짐을 실시간으로 처리할 수 있게 한다. 본 논문에서 제안하는 방법은 사전에 쪼개진 메쉬 형태가 아닌 동적 재메싱이 가능하기 때문에 가상 수술시뮬레이션이나, 실시간을 요구하는 게임 및 가상환경에서 물리 기반 모델링울 할 때 활용될 수 있다.

• 한국환경과학회지
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• 제13권10호
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• pp.891-902
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• 2004

In order to predict air pollution and Yellow-sand dispersion precisely, it is necessary to clarify the sensitivity of meteorological field input interval. Therefore numerical experiment by atmospheric dynamic model(RAMS) and atmospheric dispersion model(PDAS) was performed for evaluating the effect of temporal and spatial resolution of meteorological data on particle dispersion. The results are as follows: 1) Base on the result of RAMS simulation, surface wind direction and speed can either synchronize upper wind or not. If surface wind and upper wind do not synchronize, precise prediction of Yellow-sand dispersion is strongly associated with upwelling process of sand of particle. 2) There is no significant discrepance in distribution of particle under usage of difference temporal resolution of meteorological information at early time of simulation, but the difference of distribution of particles become large as time goes by. 3) There is little difference between calculated particles distributions in dispersion experiments with high temporal resolution of meteorological data. On the other hand, low resolution of meteorological data occur the quantitative difference of particle density and there is strong tendency to the quantitative difference.