• International Journal of Contents
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• 제1권1호
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• pp.50-58
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• 2005

Generally, multidimensional data such as image and spatial data require large amount of storage space. There is a limit to store and manage those large amounts of data in single workstation. If we manage the data on parallel computing environment which is being actively researched these days, we can get highly improved performance. In this paper, we propose a parallel multidimensional index structure that exploits the parallelism of the parallel computing environment. The proposed index structure is nP(processor)-nxmD(disk) architecture which is the hybrid type of nP-nD and 1P-nD. Its node structure in-creases fan-out and reduces the height of an index. Also, a range search algorithm that maximizes I/O parallelism is devised, and it is applied to k-nearest neighbor queries. Through various experiments, it is shown that the proposed method outperforms other parallel index structures.

• 한국농공학회논문집
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• 제53권6호
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• pp.165-170
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• 2011

Recently natural disasters such as the frequency and intensity of drought have been increasing as a result of climate change. This study suggests a drought index, WADI (Water Availability Drought Index), that considers water availability using 6 components (water intake, groundwater level, agricultural reservoir water level, dam inflow, streamflow, and precipitation) using the Z score and data monitoring on a nationwide level. SPI (Standardized Precipitation Index) was applied in coastal area. For the severe droughts of 2001 spring and 2008 autumn, the index was evaluated by comparison with reported damage areas. suggested to combine The spatial concordance rate of WADI in 2001 and 2008 for estimation of the degree of drought severity was 50 % and 24 % compared to the actual recorded data respectively.

• 농촌계획
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• 제9권1호
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• pp.47-53
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• 2003

The purpose of this research was to develop evaluation index of regional development for producing potential values of rural regions besides agriculture on a commercial scale. Rural regions have potential values such as preserved nature and spatial advantages and so on. For regional development, potential values should be synthetically evaluated by objective and standard index for supporting decision. For evaluation of plural functions of rural regions, evaluation index of rural regions was developed based on rural amenity. Applicability of evaluation index was studied using GIS and natural break method.

• 대한지리학회지
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• 제37권4호
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• pp.385-402
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• 2002

본 연구에서는 지난 26년간 (1973~1998) 기온과 상대습도에서 산출한 열지수(Heat Index)를 분석하여, 남한에서 발생한 생리기후적 체감 무더위의 시.공간적 분포 특징을 살펴보았다. 그 결과, 공간적으로, 중서부 내륙지방, 남서부 내륙지방, 남동부 내륙 지방을 중심으로 주요 생리기후 임계치 이상을 기록한 무더위가 빈번하게 발생하였다. 특히, 남동부 내륙의 밀양 지역은 타 지역에 비해 보다 빈번하게 장기간에 걸친 높은 열지수를 기록하여 남한에서 가장 무더운 생리기후적 극서지임이 밝혀졌다. 시간적으로, 1990년대에 접어들어 대부분의 연구지역에서 각 생리임계치 이상을 기록한 무더위의 발생빈도가 많이 증가하였다. 특히, 1994년은 연구기간 중 각 생리임계치 이상의 무더위 발생빈도가 남한 전 지역에 걸쳐 가장 높게 나타난 해였다. 보편적으로 일년 중 40.6$^{\circ}C$ 이상의 열지수를 나타내는 강한 무더위는 주로 여름장마가 끝나는 7월 말에서 1-2일간의 작은 강수가 시작되는 8월 초순 사이에 발생하였다. 이러한 남한의 무더위 발생의 시.공간적 분포 패턴은 대규모의 기단의 움직임뿐만 아니라 국지적인 지형, 위도, 해발고도, 수체 또는 도시화, 산업화. 조림사업 등의 자연적 인위적 기후 인자의 영향을 받아 지역마다 다양하게 나타났다.

• 한국지리정보학회지
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• 제25권3호
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• pp.29-58
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• 2022

최근 우리나라는 인구감소 문제를 겪으며 기존의 외연적 확산을 지향하는 개발방식은 주택, 기반시설의 공급과잉, 부동산 방치 등의 다양한 도시문제를 발생시키고 있다. 이를 최소화할 수 있는 해결책으로 도시기능을 주요 거점에 모으는 압축적이고 고밀의 공간구조로의 전환이 촉구되고 있다. 그러나 단순 물리적 압축이 아닌 오늘날의 인구구조 변화, 산업구조의 변화 등에 따른 기능적 연계성 및 연결성을 고려한 압축도시가 필요하다. 이러한 관점에서 본 연구는 저출산, 고령화, 인구감소 등으로 인하여 소멸위기를 겪고 있는 국내 소멸위험도시들의 압축성을 측정하고 공간구조적 특성을 살펴보았다. 기존 연구들에서 사용되었던 압축성 평가지표와 더불어 공간구문론을 활용한 연결성 지표를 포함하여 6개의 지표(인구, 토지이용, 생활서비스 접근성, 교통 접근성, 연결성, 집중성)의 압축성을 비교·분석하고, 종합적인 압축지수를 산정하였다. 분석결과, 종합 압축지수 기준 1등급 지역이 2.3%, 2등급 지역이 4.6%, 3등급 지역이 16.09%, 4등급 지역이 43.68%, 5등급 지역이 33.33%로 분류되어 전반적 압축도는 낮은 것으로 나타났다. 이때 압축지수에 영향을 미치는 도시특성이 지역에 따라 다르므로 각 지역의 압축지표별 영향력을 고려하여 소멸위험 대책과 공간정책을 수립할 필요가 있다. 본 연구는 공간구문론을 활용하여 연결성을 측정하였으며, 소멸위험도시들의 압축도를 정량적으로 비교·분석하였다는 점에서 의미가 크며, 소멸위험도시의 공간전략 수립에 중요한 자료로 활용되기를 기대한다.

• ALGAE
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• 제19권1호
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• pp.15-22
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• 2004

This study investigated the temporal and spatial dynamics of an epilithic algal community in the Hantan River in November 2001, February, May and August 2002. It was identified a total of an epiphlithic 301 taxa which were composed of 275 species, 16 varieties and 10 unidentified species. The standing crops ranged between 598,600-16,525,200 cells $\cdot$ $cm^2$ and showed the temporal and spatial variations, A higher value was found at the lower station than the upper station in winter, but a higher value was found at the upper station than the lower station in summer due to the effects of typhoons. Chlorophyll concentrations ranged between 13.4-304.2 ${\mu}g$ $\cdot$ $cm^2$. Standing crops and chlorophyll showed similar trends in autumn and winter, but temporal dynamics were not apparent in the overgrowth of Lyngbya, Schizothrix and so others in Cyanophyceae in spring and summer. They were composed of species in Chlorophyceae-Bascillariophyceae-Cyanophyceae and no seasonal effect was detected. Low diversity index values probably indicated the effects of environmental stresses (water temperature, flow and current velocity) other than organic pollution. An assessment of organic pollution using epilithic diatoms (DAIpo) showed $\alpha$-oligosaprobic states at the upper- and mid- stations, and $\alpha$-mesosaprobic states at the lower- stations.

• 한국정보처리학회논문지
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• 제3권4호
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• pp.720-732
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• 1996

아이콘 이미지를 위한 공간 매치 검색기법은 이미지를 몇개의 인식가능한 심볼로 인식하고, 이것을 도큐먼트를 대표하는 값으로 받아들여 인덱싱한다. 사용자가 이미지에 대한 내용-본위 검색을 요구하면, 질의에 있는 이미지를 심볼로 변환한 후 접근기법을 통해 원하는 이미지를 검색한다. 따라서 본 연구에서는 이미지의 내용-본위 검색을 효율적으로 지원하기 위하여, 시그니쳐를 이용한 아이콘 이미지의 공간 매치 검색 기법을 제안하다. 이를 위하여 2차원 아이코닉 이미지에 대한 새로운 색인 표현 방법을 제시하며, 구현한 전체 시스템 구성을 설명한다. 아울러 기존의 9-DLT 방법과 정확률과 검색율면에서 성능평가를 수행하여, 제안하는 기법이 이미지의 내용-본위 검색에 효율적임을 보인다.

• 농촌계획
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• 제14권4호
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• pp.109-119
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• 2008

The objectives of this study are to develop a green tourism potential evaluation method with rural amenity and demand of citizen. The new index which was named GPD(green tourism potential degree) is designed to propose the green tourism potential of rural areas using spatial analysis of geographic information system and spatial interaction of gravity model. And in order to evaluate the green tourism potential with supply side and demand side, two indices were defined; One is green tourism demand degree(GDD) which is developed to quantify a demand side potential by the analysis of urban population and urbanization index, and the other is green tourism attraction degree(GAD) which is developed to quantify a supply side potential by the analysis of rural amenity values using AHP algorithm, based on opinion of related experts. The developed method was applied to a part of Kyounggi province, Seoul and Incheon. All the study area's GAD, GDD and GPD were assessed and the proposed green tourism potential evaluation method could be used in developing rural development plans and green tourism policies considering spatial interaction with citizen and green tourism resources.

• Agricultural and Biosystems Engineering
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• 제5권1호
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• pp.10-20
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• 2004

Precision agriculture aims to minimize costs and environmental damage caused by agriculture and to maximize crop yield and profitability, based on information collected at within-field locations. In this process, quantification of soil physical properties, including soil strength, would be useful. To quantify and manage variability in soil strength, there is need for a strength sensor that can take measurements continuously while traveling across the field. In this paper, preliminary analyses were conducted using two datasets available with current technology, (1) cone penetrometer readings collected at different compaction levels and for different soil textures and (2) tillage draft (TD) collected from an entire field. The objective was to provide information useful for design of an on-the-go soil strength profile sensor and for interpretation of sensor test results. Analysis of cone index (CI) profiles led to the selection of a 0.5-m design sensing depth, 10-MPa maximum expected soil strength, and 0.1-MPa sensing resolution. Compaction level, depth, texture, and water content of the soil all affected CI. The effects of these interacting factors on data obtained with the soil strength sensor should be investigated through experiments. Spatial analyses of CI and TD indicated that the on-the-go soil strength sensor should acquire high spatial-resolution, high-frequency ($\ge$ 4 Hz) measurements to capture within-field spatial variability.

• The Journal of Asian Finance, Economics and Business
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• 제4권2호
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• pp.37-44
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• 2017

This research is devoted to the development of methods general and standard methodological approaches and approbation those for the evaluation of economic potential and level of concentration of the regions of Kazakhstan. This paper presents the results of development of the authors on the selection and justification of the methodological approaches for quantitative evaluation of the economic potential (the degree of territorial differentiation of the profile) and concentration of regions. In this study, we used scientific methods: method of analysis the main trends of economic development, and method of evaluation of concentration of the region. Based on the analysis of foreign techniques developed and tested methodical approaches to the assessment of the economic potential (index and coefficient methods). Proposed methodological approaches to the assessment profile of the territory and developed a system of indicators, which includes an aggregated index of spatial concentration, which accurately reflects the concentration of production in the region. This study shows the results of the analysis of the potential regional disparities and trends of economic development of Kazakhstan. By using, the proposed methodology shows the possibility of their use; we calculated the indicators of integrated assessment of the economic potential and indicators of spatial concentration.