• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1993년도 봄 학술발표회논문집
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• pp.117-124
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• 1993

The Neumann Expansion method has been used for evaluating the response variability of three dimensional truss structure resulting from the spatial variability of material properties with the aid of the finite element method, and in conjunction with the direct Monte Carlo simulation methods. The spatial variabilites are modeled as three-dimensional stochastic field. Yamazaki 〔1〕 has extended the Neumann Expansion method to the plane-strain problem to obtain the response variability of 2 dimensional stochastic systems. This paper presents the extension of the Neumann Expansion method to 3 dimensional stochastic systems. The results by the NEM are compared with those by the deterministic finite element analysis and by the direct Monte Carlo simulation method

• IEIE Transactions on Smart Processing and Computing
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• 제4권2호
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• pp.97-102
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• 2015

In this paper, an extension of the standard common spatial pattern (CSP) algorithm using the strong uncorrelated transform (SUT) is used in order to extract the features for an accurate classification of the left- and right-hand motor imagery tasks. The algorithm is designed to analyze the complex data, which can preserve the additional information of the relationship between the two electroencephalogram (EEG) data from distant channels. This is based on the fact that distant regions of the brain are spatially distributed spatially and related, as in a network. The real-world left- and right-hand motor imagery EEG data was acquired through the Physionet database and the support vector machine (SVM) was used as a classifier to test the proposed method. The results showed that extracting the features of the pair-wise channel data using the strong uncorrelated transform complex common spatial pattern (SUTCCSP) provides a higher classification rate compared to the standard CSP algorithm.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.741-743
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• 2003

This study focuses on monitoring the surface UHI in a tropical city of Bangkok in both spatial and temporal dimensions based on MODIS- and TM -derived land surface temperature (LST). The spatial extension and magnitude of the surface UHI are explored for days and nights as well as its variations through the dry (least-clouded) season. Surface UHI growth between 1993 and 2002 is mapped using highresolution LANDSAT TM thermal bands. UHI patterns are, then, analyzed in association with land/vegetation covers derived from high-resolution ETM+ and ASTER satellites and ancillary data.

• Spatial Information Research
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• 제19권2호
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• pp.47-56
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• 2011

대표적인 트리 기반 공간 인덱스 구조는 크게 R-Tree와 같은 데이타 분할 기반 인덱스 구조와 KD-Tree와 같은 공간 분할 기반 인덱스 구조로 구분되며, 최근에는 이들의 장점을 결합한 하이브리드 인덱스 구조에 대한 연구가 활발히 진행되고 있다. 그러나, 기존 연구에서는 공간 객체가 삽입되는 노드의 분할 경계 확장이 다른 이웃 노드에 연쇄적으로 전파되어 노드간 겹침이 증가하고 질의 처리 비용이 높아지는 문제가 있다. 본 논문에서는 이러한 문제를 해결하기 위하여 효율적인 질의 처리를 위한 하이브리드 인덱스 구조인 SQR-Tree를 제시한다. SQR-Tree는 크기를 갖는 공간 객체 처리에 적합하도록 Quad-Tree를 확장한 SQ-Tree(Spatial Quad-Tree)와 SQ-Tree의 리프 노드마다 연계되어 실제로 공간 객체를 저장하는 R-Tree가 결합된 인덱스 구조이다. SQR-Tree는 노드마다 하위 노드를 포함하는 MBR을 가지고 있기 때문에 노드의 분할 경계 확장이 독립적으로 이루어지도록 하여 노드간 겹침을 줄였다. 그리고 SQR-Tree에서 공간 객체는 분할된 데이타 공간마다 존재하는 여러 R-Tree에 분산 저장되며 SQ-Tree가 분할된 데이타 공간을 식별하는 기능을 수행한다. 따라서 공간 질의 처리시 질의 영역에 해당하는 R-Tree만 접근하면 되기 때문에 질의 처리 비용을 줄일 수 있다. 마지막으로 실험을 통해 SQR-Tree의 우수성을 입증하였다.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 2003년도 공동 춘계학술대회 논문집
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• pp.297-299
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• 2003

Altimeter(Topex/Poseidon) and AVHRR(NOAA) data were used to study the variations and correlations of Sea Level(SL) and Sea Surface Temperature (SST) in the North East Asian Seas from November 1993 to May 1998. This region is influenced simultaneously to continental and oceanic climate as the border of the East Sea(Japan Sea). SL and SST have increased gradually every year because the global warming, and presented usually a strong annual variations in Kuroshio extension region with the influence of bottom topography.

• 교육시설 논문지
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• 제19권2호
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• pp.41-50
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• 2012

This study aims to analyze chlidcare philosophy and the architectural characteristics of communal childcare cooperative nurseries(parent cooperative childcare facilities), and also to examine their mutual relationship. The communal childcare cooperative is an ideal childcare method to break away from employee-supported childcare system and cooperatively solve childcare problems in the family community system. The child-rearing philosophy of the communal childcare can bring spontaneous and creative development amidst 'daily life' and 'play' by switching from knowledge and skill-oriented education and puts an emphasis on physical environments in child's growth. The features of architecture related the childcare philosophy derived from this study are as follows: the way of participation and self-help, the extension of spatial scope and focuses on outside space, architecture of house-like residence rather than educational facility, spatial 'overlapping' focusing on transitional space and multi-purpose space rather than spatial partitions, the pursuit of creativity through play is realized in the incompletion and unspecification of space evolving over time.

• 한국가구학회지
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• 제20권4호
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• pp.374-387
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• 2009

Gerrit Rietveld who is Dutch architect and furniture designer had explored the plastic abstractness based on the universality of De Stijl principle. He had tried to expand the boundary of furniture design bound to traditional form and decorative aesthetics. Beginning of 20th century, he opened the new aesthetic realm of pure and abstract value for furniture design for the first time. Through this research, the results can be summarized as follows. The characteristics of his deign are abstractness, spatial consideration and tectonic construction. The abstractness is attained by simplifying constructional material into geometrical forms such as straight line, rectangle and square. And he adopted unconventional way of construction in order to increase this abstractness. The space included in his furniture can be expressed in the new technology of joint, the visual transparency using linear material, and the destruction of corners. All these aspects harmoniously helped the feeling of architectural space of flow. Through the exposed frame of furniture, Rietveld emphasized on the tectonic construction by methodological treatment such as piling-up or overlapping material. The characteristics of Gerrit Rietveld's design are abstract, spatial and tectonic. These aesthetical tendencies could be understood as a junction between De Stijl's principles and modern architecture's spatial preferences-flow and extension of space-.

• 한국통신학회논문지
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• 제35권2A호
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• pp.105-111
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• 2010

Random Unitary Beamforming (RUB) 은 다중사용자 다중안테나 broadcast 채널에서 매우 간단하면서도 실제적인 전송 기법이다. 본 논문에서는 일반적인 RUB의 형태를 확장시켜 공간다중화 이득을 얻을 수 있는 방법에 대해 고려하였다. 즉 수신기가 2개의 안테나를 가짐으로써 더 많은 데이터를 가지는 방법을 고려하였다. 이를 위해 송신기와 수신기의 새로운 코드북을 제안하고, 수신기에서 Minimum Mean Square Error Successive Interference Cancellation (MMSE-SIC) 기법을 사용함으로써 총 전송율이 증가함을 모의실험 결과를 통해 확인하였다.

• 한국주거학회논문집
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• 제22권2호
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• pp.91-99
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• 2011

The purpose of this study is to clarify the transitional process of spatial configuration of 'Topdong Yangdalmal'; One of the existing 22 old settlements in cheongju city. The results are as follows. 1) Side roads are derived from Inner road until 1970, so large-scale lots are subdivided small-scale lots. The houses are mostly in 1970s and 1980s. The existing old houses are 11, their orientation are East South, and the entrance gives on side road. The orientation, court yard, and entrance of the houses nearby side roads keep ongoing, in spite of alteration and extension. Especially, Entrance is changed by the new arterial roads and subdivided lots, but, the houses nearby side roads are continued as in the past. 2) The newly built houses in 1970's are 20, and it's arrangements are equal to existing old one. The orientation of houses after 1980's is the same in 1970's. But, the entrance is changed by subdivided lots, and the size of the court yard are reduced or disappeared. In other hand, the houses as the same size of the existing houses, and Storyincrease continue court yard as in the past. Therefore, the houses which are nearby inner road, and increase story, are continued, in spite of the newly built one.

• 대한원격탐사학회지
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• 제26권2호
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• pp.133-142
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• 2010

웹 기반 공간정보 서비스가 다양하게 발전하고 있으므로 이와 관련된 카탈로그 서비스 관련 기술이나 표준에 대한 중요성이 강조되고 있다. 본 연구에서는 카탈로그 서비스를 위한 OGC CSW 표준 인터페이스의 기본 요소를 지원하는 시험 모델을 오픈 소스 데이터베이스관리시스템인 PostgreSQL와 연계하여 설계, 구현하였다. 카탈로그 서비스 모델의 기본요소와 함께 메타데이터 서버 구성요소로서 PostgreSQL의 XML 질의 처리 함수를 적용하였다. XML 메타데이터 서버 구축에서는 ISO 메타데이터 표준사양을 이용하였다. 대상 공간정보와 콘텐츠 서비스를 위한 웹 어플리케이션을 구축하는 경우에 본 시험 모델은 직접 적용이 가능하며, 국제 표준 사양을 지원하므로 기존의 웹 기반 공간정보 서비스 시스템과도 연동이 가능하다.