• 대한원격탐사학회지
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• 제33권4호
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• pp.351-358
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• 2017

A new method to decompose the footprints of marine atmosphere boundary layer (MABL) on Synthetic Aperture Radar (SAR) imagery into characteristic spatial scales is proposed. Using two-dimensional Empirical Mode Decomposition (EMD) we obtain three Intrinsic Mode Functions (IMFs), which mainly present longitudinal rolls, three-dimensional cells and atmospheric gravity waves (AGW). The rolls and cells have spatial scales between 3.0 km and 3.8 km and between 5.3 km and 7.1 km, respectively. Based on previous observations and mixed-layer similarity theory, we estimated MABL's depths that vary from 0.95 km to 1.2 km over the rolls and from 3.0 km to 3.8 km over the cells. The AGW has maximum spectrum at 14.3 km wavelength. The method developed in this work can be used to decompose other satellite imageries into individual features through characteristic spatial scales.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제8권2호
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• pp.127-140
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• 2002

공간 데이타베이스 시스템에서 데이타베이스의 일관성 유지를 위해 의미적 무결성을 지원해야 한다. 실세계의 경계(boundary) 레이어에서 경계는 주위의 공간 객체들과 항상 접해 있어야만 하는 상접(meet)한 성질과 두개 이상의 다른 공간 객체가 동일한 이름을 가질 수 없는 성질을 가진다. 이 성질은 실세계에서 묵시적으로 인지되는 개념이다. 따라서 공간 객체의 갱신으로 인해 레이어에 대한 묵시적인 개념이 위배될 경우 무결성 유지가 필요하다. 따라서 본 논문에서는 이 레이어에 대한 공간 객체의 무결성을 유지하기 위한 공간 연산 트리거를 제안한다. 제안한 기법은 SQL-3를 기반으로 공간 연산 트리거 정의어를 정의하고, 레이어에 대한 무결성 제약조건이 위배될 때 수행되며, 공간 연산 트리거 수행 전략으로 동일 레이어에 대한 공간과 비공간 데이타 트리거로 나누어 수행되고, 다른 레이어에 대한 비공간 데이타 트리거를 수행하는 기법이다. 공간 연산 트리거 관리기는 사용자에게 의해 정의된 공간 연산 트리거 정의어는 공간 연산 트리거 처리기를 통해 파스트리를 생성하여 카탈로그 관리기를 통하여 데이타베이스에 저장되며, 갱신 질의시 공간 연산 트리거 수행 처리기를 통해 공간 데이타베이스의 일관성을 유지시켜주는 구조를 가지고 있다. 공간 연산 트리거는 상접성을 유지해야 하는 공간 객체들의 의미적 무결성을 위해 공간과 비공간 데이타에 대하여 3 단계 수행으로 공간 객체에 대한 의미적 무결성 유지와 자동 보정으로 사용자 편의성을 제공한다.

• 한국실내디자인학회논문집
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• 제23권3호
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• pp.56-63
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• 2014

Furniture has been developed in pursuit of human convenience and comfort, but nowadays it does not consider human users and gradually loses the essence of furniture. Especially furniture design that disregards the relation with space loses both the meaning and purpose of furniture. In this regards, it is necessary to understand the essence of furniture design and establish a design direction for future progress. Based on the relation between furniture and space, this paper intended to study on John Pawson's works that pursued the essence of design focusing on users, and propose a direction in a sense of real meaning for modern furniture design after exploring the characteristic of the furniture design of John Pawson. The study method of this paper was to investigate the design language of John Pawson and analyze his furniture in the morphological structural, functional, and material aspects. Based on such analysis, this study investigated the characteristics of the furniture design and found out what the core of the design that he pursued was. The scope of the study included the Independent Furniture that was restricted furniture collections of Driade and Spatial Furniture designed and installed at the stage of space construction. The study result showed that the design of John Pawson considered 'the suitability to a specific place' as important factor and furniture was planned at the stage of planning space. Each independent furniture defines all spaces in the morphological, lay-out and functional aspects of furniture and emphasizes their own property. As Spatial Furniture shares the function of spatial composition element, Pawson's furniture can be all called Spatial Furniture.

• East Asian mathematical journal
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• 제33권5호
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• pp.511-525
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• 2017

We introduce an extrapolated higher order characteristic finite element method to construct approximate solutions of a Sobolev equation with a convection term. The higher order of convergence in both the temporal direction and the spatial direction in $L^2$ normed space is established and some computational results to support our theoretical results are presented.

• East Asian mathematical journal
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• 제34권5호
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• pp.601-614
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• 2018

In this paper, we introduce an extrapolated higher order characteristic finite element method to approximate solutions of nonlinear Sobolev equations with a convection term and we establish the higher order of convergence in the temporal and the spatial directions with respect to $L^2$ norm.

• Journal of applied mathematics & informatics
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• 제36권3_4호
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• pp.257-270
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• 2018

An extrapolated Crank-Nicolson characteristic finite element method is introduced for approximate solutions of nonlinear Sobolev equations with a convection term. And we obtain the higher order of convergence for approximate solutions in the temporal and the spatial directions with respect to $L^2$ norm.

• Wind and Structures
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• 제22권5호
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• pp.555-571
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• 2016

A hanging-type sand-retaining wall is a very common sand-blocking fence structure used to prevent sand movement. This type of wall is widely used along the Qinghai-Tibet and Gobi desert railways in Xinjiang, Western China. To analyze the characteristics of wind-sand flow fields under the effect of such a sand fence structure, a wind tunnel test and a field test were carried out. The wind tunnel test showed the zoning characteristics of the flow fields under the effect of the hanging-type sand-retaining wall, and the field test provided the sediment transport data for effective wind-proof interval and the sand resistance data in the front and behind the sand-retaining wall. The consistency of the wind-sand flow fields with the spatial distribution characteristic of wind-carried sand motion was verified by the correspondences of the acceleration zone in the flow field and the negative elevation points of the percentage variations of the sand collection rate. The spatial distribution characteristic of the field sand collection data further showed the spatial structural characteristic of the sandy air currents under the action of the hanging-type sand-retaining wall and the sand resistance characteristic of the sand-retaining wall. This systematic study on the wind-sand flow fields under the control of the hanging-type sand-retaining wall provides a theoretical basis for the rational layout of sand control engineering systems and the efficient utilization of a hanging-type sand-retaining wall.

• 한국실내디자인학회논문집
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• 제17권5호
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• pp.40-50
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• 2008

This article examined the applicability of spatial configuration to Escher's works through configurative logics and rules and studied the contrasting relations among the unit elements in Escher's works and their characteristics and the creative process of the characteristics. As the results of the study on the bases to maintain and create the partial elements revealed as the characteristics, it was shown that Escher's sequential transformative works demonstrated diverse expressive characteristics as a creative process of Inter-complementary contrasting relations based on the independence of the unit elements. It was also shown that the creative process of the unit elements was actualized through the maintenance base of the fixed and absolute characteristic as the logic for the creation and the creation base of the dynamic and relative characteristic. Therefore, it was interpreted that by applying the logics for creation to Escher's unit elements through the spatial interpretation of the maintenance base and the creation base as well as by configuring the units created in such a way according to the characteristics of Escher's works, spatial possibility canbe derived out from Escher's contrasting tessellation works. The process of spatial configuration is the process to make a balance between various conditions, artists own understanding of the space and his/her intention of the space. From this viewpoint, the logics for maintenance base and for creation base seem to have the potentiality as a spatial configuration to consistently meet the given conditions as well as to derive out novelty through the transformation to maintain the fixed and absolute condition(base) and the characteristics of the independent(additional) transformation arising together with the implicit relations among the transformative units.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제24권3호
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• pp.17-27
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• 2018

Purpose: This study aims to examine spatial characteristics of emergency department Chronologically through case studies; and to consider the social implication of these spatial changes. Methods: In this study, a total of eight emergency departments, one for each period, were selected in order to analyze the spatial characteristics. The spatial maps of Space Syntax were employed for analyzing case studies. Results: The spatial configuration of emergency department has been changed from five or more emergency department specialties to four or less specialties such as psychiatric, pediatrics, emergency, and trauma. In the case of care initiation area, the concentrated arrangement mode was switched from the distributed arrangement mode. The spatial maps indicate that it can be seen that the tree structure changes to an annular structure emphasizing the connection between the spaces in the emergency department. This shows that the space efficiency, safe, visual control and flexibility in the planning of the emergency department are important factors affecting the spatial structure of the emergency department. Implications: In the future, it is expected that Korean emergency department will be more focused on efficiency, safe, visual control, and flexibility in the planning as in the case studies of the United States.

• 한국측량학회지
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• 제18권1호
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• pp.67-73
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• 2000

공업화, 도시화가 지속되어 내륙 수계의 수질은 날로 오염되고 있으며, 이와 함께 호수의 수질 또한 악화되어 호수 수질오염 문제는 새로운 수질관리 방안을 필요로 하게 되었다. 본 연구는 GSIS(Geo-Spatial Information System)을 이용한 호수의 수질 관리를 위한 방안의 초기단계로서 GSIS 환경에서 호수의 각종 수리학적 특성 정보를 자동 추출할 수 있는 방안에 대하여 연구하였으며 또한, 추출된 호수의 수리학적 특성정보의 활용의 일례로서 유한차분법을 이용한 호수 수체 흐름의 특성분석을 수행하였다. 수체 흐름의 특성분석에 필요한 각종 수리학적 특성 정보 추출을 GSIS를 이용하여 자동화하므로서 분석작업을 효율적으로 수행할 수 있었으며, 특히 호수단면 정보의 추출을 출력물의 형태가 아닌 다른 정보와 결합하여 분석 가능한 형태로 추출하므로서 호수의 성층현상분석과 같은 호수의 단면정보가 필수적인 각종 분석을 GSIS 환경에서 가능하도록 하였다.