• Journal of Korea Multimedia Society
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• v.4 no.6
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• pp.570-578
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• 2001

Boundary scan architecture test methodology was introduced to facilitate the testing of complex printed circuit board. The boundary scan architecture has a tremendous potential for real time monitoring of the operational status of a system without interference of normal system operation. In this paper, a new type of embedded controller for real time monitoring of the operational status of a system is proposed and designed by using boundary scan architecture. The proposed real time monitoring embedded controller consists of test access port controller and an embedded controller proposed real time monitoring embedded controller using boundary scan architecture can save the hard-wire resource and can easily interface with boundary scan architecture chip. Experimental results show that the real time monitoring using proposed embedded controller is more effective then the real time monitoring using host computer.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.83-86
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• 2002

최근 지리 정보 시스템이나 공간 데이터 베이스 시스템이 발전하면서 실세계를 효율적으로 모델링하려는 맡은 연구가 수행되고 있다. 기존의 단순한 point, line, polygon으로 모델링했던 방법들을 multipoint, multiline, multipolygon과 같은 복잡한 객체를 표현하기 위한 연구로 확장되었다. 또한 이러한 공간 객체의 이력을 효율적으로 관리하기 위해 공간 객체를 시간으로 확장하는 연구가 수행되고 있다. 이러한 모델들은 명확한 경계를 가진 시공간 객체를 대상으로 한다. 자연, 사회 문화 현상, 생태 같은 경계가 명확하지 않은 객체를 단순한 경계를 가진 공간 객체로 모델링하기에는 그 표현력이 부족하다. 따라서 이 논문에서는 이런 문제점을 해결하기 위해서 불확실한 경계를 가진 시공간 데이터 모델을 제시한다. 이 논문에서 제시한 불확실한 경제를 가진 시공간 모델의 설계는 상호 운용을 증진하기 위하여 OGC(OpenGIS Consortium)에서 제시한 2차원 기하 객체 모델을 기반으로 불확실한 경계를 가지는 공간 데이터 모델로 확장한다. 또한, 이 불확실한 경계를 가지는 단순한 공간 모델을 시간 영역으로 확장하여 유효시간을 갖는 불확실한 시공간 데이터 모델을 설계한다. 또한, 이 논문에서 제시한 불확실한 경계를 가진 시공간 객체 모델을 바탕으로 실세계의 다양하고 복잡한 객체에 대한 효율적인 질의가 가능한 시공간 연산자를 제시한다.

• Journal of Digital Convergence
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• v.11 no.1
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• pp.191-198
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• 2013

The interests in alternative office systems and solutions (called smart work in Korea) are growing. With the lens of boundary theory, this paper tries to understand the nature of work/nonwork boundaries which smart work will be expected to blur. Boundary theory provides permeability, boundary strength, and interference as its key concepts and an empirical study is performed about the individual perception on those concepts. The result of the survey from telecommuters and/or smart work center users at the Company K shows that they perceive work/nonwork permeability, boundary strength, and interference are asymmetric. The result suggests that asymmetric nature of the work/nonwork boundaries should be taken into account when alternative office systems are brought into use.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.8A
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• pp.829-835
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• 2002

When finite length image signal is decomposed into M-band synthesized using M-band orthogonal wavelet transform, the boundary signal of image are not reconstructed perfectly. for boundary signals to be reconstructed perfectly, different type filter bank or technique is applied to them when the dimension of analysed is proposed. It can be designed using the singular value decomposition of boundary perfect reconstruction matrix which is obtained from paraunitary matrix which is obtained from paraunitary matrix. And it is also discussed to design the boundary filter bank for improving the coding performance when it is applied to subband coder. The proposed boundary filter bank shows 7% gains in PSNR compared with reflected method.

• Journal of the Korean GEO-environmental Society
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• v.17 no.2
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• pp.41-49
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• 2016

This paper evaluates the interface shear strength of HDPE textured geomembrane. The interface shear strength between textured geomembrane and marl, and textured geomembrane and woven geotextile were measured; and the smooth geomembrane was used to evaluate the effect of "texture" on the interface shear strength. The interface shear strength was measured using a large direct shear testing device under several conditions including the presence of water, and the normal stresses that were 12, 24, 45, 100, 500, and 1,000 kPa. From testing results, it was found that there was meaningful reduction in the interface shear strength in the presence of water, but the effect of normal stress was not clear. The interface shear strength was measured to be significantly different for smooth geomembrane, whose strength was measured to be as small as half that of the textured geomembrane.

• Journal of the Korean association of regional geographers
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• v.16 no.5
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• pp.549-558
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• 2010

This study is to investigate the relative impacts of urban growth boundaries(UGBs) on metropolitan growth patterns in the United States over a period of time. Through statistical analyses, we evaluate the extent to which UGBs affect the density of residential development in metropolitan areas with UGBs. We also attempt to understand the overall impact of UGBs and the importance of UGBs relative to other determinants of urban growth patterns. Our works found that urban growth patterns differ significantly between cities with UGBs and cities without. UGBs have significant causal effect on urban housing and population densities, but are relatively less important than other factors. This implies that there are factors affecting the variation for which the given data cannot account. Despite the limitations of the data, the findings of this analysis suggest that UGBs have some positive effects on curbing urban sprawl.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.12 no.4
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• pp.81-93
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• 1992

Numerical modeling of problems having infinite and semi-infinite boundaries is studied using a coupled method of distinct elements and boundary elements. The regions which are restricted on stress concentration area of loading points, excavation surface, and geometric discontinuity in the underground structures, are modeled using distinct elements, while the infinite and semi-infinite regions are modeled using linear boundary elements. Linear boundary elements for infinite and semi-infinite region are respectively composed using the Kelvin's and the Melan's solution, respectively. For the completeness, the boundary element method, the distinct element, and the coupled method of distinct elements and boundary elements are studied independently. The coupled method is verified and is applied to underground structures of infinite and semi-infinite regions. Through the comparison of the results, it is concluded that the coupled analysis may be used for discontinuous underground structures in the effective manner.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.39 no.3
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• pp.44-52
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• 2002

In this paper, we present an analytical method for decision boundary feature extraction for neural networks. It has been shown that all the features necessary to achieve the same classification accuracy xxxas in the original space can be obtained from the vectors normal to decision boundaries. However, the vector normal to the decision boundary of a neural network has been calculated numerically using a gradient approximation. This process is time-consuming and the normal vector may be inaccurately estimated. In this paper, we propose a method to improve the performance of the previous decision boundary feature extraction for neural networks by accurately calculating the normal vector When the normal vectors are computed analytically, it is possible to reduce the processing time significantly and improve the performance of the previous implementation that employs numerical approximation.

• Journal of the Korea Society of Computer and Information
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• v.12 no.3
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• pp.105-113
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• 2007

In this paper, an image segmentation method which is based on edge salience map and region merging is presented. The edge salience map is calculated by combining a texture edge map with a color edge map. The texture edge map is computed over multiple spatial orientations and frequencies by using Gabor filter. A color edge is computed over the H component of the HSI color model. Then the Watershed transformation technique is applied to the edge salience map to and homogeneous regions where the dissimilarity of color and texture distribution is relatively low. The Watershed transformation tends to over-segment images. To merge the over-segmented regions, first of all, morphological operation is applied to the edge salience map to enhance a contrast of it and also to find mark regions. Then the region characteristics, a Gabor texture vector and a mean color, in the segmented regions is defined and regions that have the similar characteristics, are merged. Experimental results have demonstrated the superiority in segmentation results for various images.

• Journal of the Korean GEO-environmental Society
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• v.13 no.8
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• pp.65-73
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• 2012

Soil-rock interface, mainly founded in Granite region of Korea, is known as one of the important factor of the slope failure at the rainfall due to smaller shear strength than soil itself. However, research of the effect on slope stability by soil-rock interfaces is insufficient. Therefore, a series of direct shear tests were performed in order to investigate the effect of soil-rock interface on slope stability. The method of tests is to get sand itself and sand-artificial rock interface shear strength from different grain size of sands and artificial rock samples. The results of tests show that the friction angle of interface depends primarily on particle size and surface roughness. Interface friction angle ratio ${\mu}(={\delta}/{\Phi})$ is in the range of 0.75 ~ 0.96, this results indicate that interface friction angle is smaller than sand itself.