• 한국컴퓨터산업학회논문지
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• 제6권2호
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• pp.365-372
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• 2005

일반적으로 응용프로그램에서 병렬성 추출에 대한 핵심 부분은 루프이고 루프내의 첨자변수들 사이에는 자료종속성이 존재한다. 특히 문장들 사이에 가변 및 불변종속거리를 갖는 종속관계는 매우 복잡하다. 따라서 이 경우 컴파일 시 병렬성 추출은 매우 어렵다. 따라서 본 논문에서는 기존에 제시되어있는 병렬성 추출 방법들 중에서 unimodular방법과 non-unimodular방법에 대하여 분석하고 이들의 장단점을 파악하여 향후 효율적인 종속성 제거방법을 제안하는데 도움이 되고자한다.

• 응용통계연구
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• 제11권1호
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• pp.177-184
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• 1998

일반적인 판별분류분석은 자료점들간의 독립성 가정을 기본 전제로 한다. 본 연구에서는 자료점 간의 종속구조를 반영하는 판별분류기준을 제안하였으며 이를 위하여 조건부 자기 로지스틱(conditional autologistic) 모형을 이용하였다. 또한 모의실험을 통해 제시된 기준을 기존의 방법과 비교하였다.

• 한국안전학회지
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• 제25권4호
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• pp.30-35
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• 2010

For the safe handling of acetone, the flash point, the explosion limit at $25^{\circ}C$ and the temperature dependence of the explosion limits were investigated. And the AIT for acetone were experimented. By using the literatures data, the lower and upper explosion limits of acetone recommended 2.5 vol% and 13.0 vol%, respectively. In this study, the lower flash points of acetone recommended $-20^{\circ}C$. This study was determined relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for acetone, and the experimental AIT of acetone was $565^{\circ}C$. The new equations for predicting the temperature dependence of the explosion limits of acetone is proposed. The values calculated by the proposed equations were a good agreement with the literature data.

• 한국산림과학회지
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• 제94권2호통권159호
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• pp.90-95
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• 2005

Place bonding, defined as the extent to which a person values or identifies with a particular environment, has focused as a research topic recently. This paper investigates the dimensions of place bonding for Worak-san National Park campers to enhance managers' ability to address deeper landscape meanings. Worak-san National Park campers (n=416) were surveyed during summer and fall of 2004 to collect the data. Confirmatory factor analysis of the data demonstrated that place bonding was composed of four dimensions such as place identity, familiarity, place dependence and place belongingness. The results of this study can provide valuation information for developing management actions to enhance park visitors' quality of recreational experiences.

• 한국결정학회지
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• 제12권3호
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• pp.157-161
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• 2001

Pb계 완화형 강유전체인 Pb(Mg/sub ⅓/Nb/sub ⅔/O₃계에서 relaxation 현상과 freezing 거동을 살펴보기위해 낮은 전계에서 측정된 물성들과 강전계 하에서 측정된 물성들을 다양한 주파수 범위에서 비교분석하였다. -40∼90℃의 상전이 온도범위에 걸쳐 1 V/mm의 낮은전계에서 측정된 유전특성의 온도의존성을 구하고 유전이력곡선의 기울기로부터 계산된 유전상수의 온도의존성을 관찰하였다. 이상의 결과와 함께 초전 전류의 온도의존성을 검토한 결과 Vogel-Fulcher 관계식에 비교적 잘 일치되었다. 본 연구를 통하여 일정한 경향을 나타내는 freezing 온도를 산출할 수 있었다.

• 한국안전학회지
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• 제26권2호
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• pp.36-41
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• 2011

For the safe handling of n-hexane, the explosion limit at $25^{\circ}C$, the temperature dependence of the explosion limits and the lower flash point were investigated. And AITs(auto-ignition temperatures) by ignition delay time for n-hexane were experimented. By using the literatures data, the lower and upper explosion limits of n-hexane recommended 1.0 Vol% and 8.0 Vol%, respectively. In this study, the lower flash points of n-hexane recommended $-23^{\circ}C$. This study measured relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for n-hexane, and the experimental AIT of n-hexane was $240^{\circ}C$. The new equations for predicting the temperature dependence of the explosion limits of n-hexane is proposed. The values calculated by the proposed equations were a good agreement with the literature data.

• 한국자기공명학회논문지
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• 제2권1호
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• pp.66-83
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• 1998

Study on spin-rotation relaxation of nuclear spins located on a methyl group can reveal valuable dynamic information related to the internal rotation of methyl group itself. Toward this end we have measured methyl carbon-13 spin-rotation of methyl group itself. Toward this end we have measured methyl carbon-13 spin-rotational relaxation rate in toluene and 2-chloro-p-xylene over the temperature range of 179-363K. To interpret the temperature dependence of measured spin-rotational relaxation rate we have revised the temperature dependence of measured spin-rotational relaxation rate we have revised the expression derived thus far by other authors and reproduced experimental data on the basis of the newly derived expression. The results confirmed that our expression leads to better agreement with experimental data than the previous one over observed temperature range, especially at high temperature.

• 한국측량학회지
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• 제30권6_2호
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• pp.653-663
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• 2012

Using soft classification, it is possible to obtain the land cover proportions from the remotely sensed image. These land cover proportions are then used as input data for a procedure called "super-resolution mapping" to produce the predicted hard land cover layers at higher resolution than the original remotely sensed image. Superresolution mapping can be implemented using a number of algorithms in which the Hopfield Neural Network (HNN) has showed some advantages. The HNN has improved the land cover classification through superresolution mapping greatly with the high resolution data. However, the super-resolution mapping is based on the spatial dependence assumption, therefore it is predicted that the accuracy of resulted land cover classes depends on the relative size of spatial features and the spatial resolution of the remotely sensed image. This research is to evaluate the capability of HNN to implement the super-resolution mapping for SPOT image to create higher resolution land cover classes with different zoom factor.

• Journal of Information Display
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• 제11권2호
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• pp.39-44
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• 2010

The time dependences of the luminance properties of 55-inch CCFL and LED backlights and 32-inch FFL backlights with LCD panels were investigated during the warm-up time from the cold start. The long-term luminance maintenance curve of a standard CCFL was examined in a time window up to 5000 hours. These two time dependences are important characteristics from the viewpoint of initial picture quality and lifetime reliability, respectively. Empirical equations were suggested for the analysis of the time dependence of these luminance data. These approaches are expected to be helpful in predicting the luminance properties of backlights based on the luminance data obtained in a limited time window.

• Journal of the Korean Data and Information Science Society
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• 제23권3호
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• pp.595-604
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• 2012

In this article, we consider chaotic behavior happened in nonsmooth dynamical systems. To quantify such a behavior, a computation of Lyapunov exponents for chaotic orbits of a given nonsmooth dynamical system is focused. The Lyapunov exponent is a very important concept in chaotic theory, because this quantity measures the sensitive dependence on initial conditions in dynamical systems. Therefore, Lyapunov exponents can decide whether an orbit is chaos or not. To measure the sensitive dependence on initial conditions for nonsmooth dynamical systems, the calculation of Lyapunov exponent plays a key role, but in a theoretical point of view or based on the definition of Lyapunov exponents, Lyapunov exponents of nonsmooth orbit could not be calculated easily, because the Jacobian derivative at some point in the orbit may not exists. We use an algorithmic calculation method for computing Lyapunov exponents using time series for a two dimensional piecewise smooth dynamic system.