• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.261-263
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• 1999

공간 DBMS는 공간 데이터와 비공간 데이터를 서로 다른 물리적인 페이지에 저장한다. 공간 질의의 효율적인 처리를 위해 공간 데이터에 대한 공간 색인을 생성하며, 성능 향상을 위하여 이를 클러스터링 색인으로 사용한다. 그러나, 공간 데이터에 대한 클러스터링 성질이 비공간 데이터 페이지에는 반영되지 않아 공간 데이터와 비공간 데이터는 서로 다른 물리적 순서를 갖는다. 이로 인해 공간 조건(Spatial Predicate)에 의해 선택된 공간 데이터는 물리적 인접성을 가지는 반면, 비공간 데이터는 물리적 인접성을 갖지 않는다. 즉, 공간 질의 처리 과정에서 비공간 데이터 페이지의 잦은 디스크 I/O를 유발한다. 본 논문에서는 효율적 공간 검색을 위한 색인 키 중복 기법을 제안한다. 제안한 기법은 공간 데이터의 색인 기값을 비공간 데이터 내에 중복시키고 공간, 비공간 데이터에 대해 각각의 공간 클러스터링 색인을 생성한다. 두 클러스터링 색인에 의해 공간 데이터와 마찬가지로 비공간 데이터도 공간 조건에 대한 클러스터링 성질을 유지할 수 있다. 질의 처리 과정에서 공간 조건에 의해 선택된 공간 객체들은 공간, 비공간 데이터들 모두 물리적 인접성을 가지게 되며, 비공간 데이터 페이지에 대한 디스크 액세스 횟수를 줄여 공간 검색의 성능을 향상시킬수 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.5
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• pp.2383-2389
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• 2011

Ubiquitous applications require hybrid continuous query processing which processes both on-line data stream and spatial data in the disk. In the hybrid continuous spatial query processing, disk access costs for the high-volume spatial data should be minimized. However, previous indexing methods cannot reduce the disk seek time, because it is difficult that the data are stored in contiguity with others. Also, existing methods for the space-filling curve considering data cluster have the problem which does not cluster available data for queries. Therefore, we propose the region storage structure for efficient data access in hybrid continues spatial query processing. This paper shows that there is an obvious improvement of query processing costs through the contiguous data storing method and the group processing for user queries based on the region storage structure.

• The Journal of the Korea Contents Association
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• v.19 no.9
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• pp.476-484
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• 2019

RFID yoking proof proves that a pair of tags is scanned at the same time. Since the tags scanned simultaneously by a single reader are adjacent to each other, the yoking proof is used in applications that need to check the physical proximity of tagged objects. Most of the yoking proof schemes require pre-knowledge on adjacent tags. If an error occurs in the process of collecting information about adjacent tags, all subsequent proofs will fail verification. However, there is no research that suggests specific methods for obtaining information about adjacent tags. In this study, I propose a tag proximity information acquisition scheme for a yoking proof. The proposed method consists of two steps: scanning area determination and scanning area verification. In the first step, the size and position of the area to scan tags is determined in consideration of position and transmission range of the tags. In the next step, whether tag scanning is performed within the scanning area or not is verified through reference tags of the fixed position. In analysis, I show that the determined scanning area assures acquisition of adjacent tag information and the scanning area verification detects deformation and deviation of the scanning area.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.47 no.2
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• pp.1-10
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• 2010

Mapping virtual process topology to physical processor topology is one of the most important design issues in parallel programming. However, the mapping problem is complicated due to the topology irregularity and routing complexity. This paper proposes a new process mapping scheme called adjacency-based mapping (AM) for irregular cluster systems assuming that the two-dimensional mesh process topology is specified as an interprocess communication pattern. The cluster systems have been studied and developed for many years since they provide high interconnection flexibility, scalability, and expandability which are not attainable in traditional regular networks. The proposed AM tries to map neighboring processes in virtual process topology to adjacent processors in physical processor topology. Simulation study shows that the proposed AM results in better mapping quality and shorter interprocess latency compared to the conventional approaches.

• Journal of the Korean Geographical Society
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• v.49 no.1
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• pp.57-76
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• 2014

Conventional treatments of war diffusion focus extensively on dyadic relationships, whose impact is thought to be immutable over the course of the conf lict. This study indicates that such conceptions are at best incomplete, and more likely misleading to explain the spatial diffusion of wars. Using social network analysis, we examine war joining behavior during World War I. By employing social network analysis, we attempted to overcome the dichotomous understanding of geography as space and network in the discipline of conflict studies. Empirically, networked structural elements of state relationships (e.g., rivalry, alliances) have explanatory and predictive value that must be included alongside dyadic considerations in analyzing war joining behavior. In addition, our analysis demonstrates that the diffusion of conflict involves different driving forces over time.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2002.09a
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• pp.144-147
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• 2002

효과적인 국내 충적층 지하수의 이용을 위해서는, 충적 대수층의 내부 구조를 정밀하게 평가하여야 한다. 특히, 강변여과, 인공 침투지 등의 적극적인 충적 대수층의 활용을 위해서는 충적 대수층의 퇴적 환경에 대한 이해가 요구된다. 국내 충적층의 대부분은 하천 둔치 주변에서 하도의 수평 이동에 의해 형성된 경사 지층으로, 니질 박층이 협재하므로 내부의 분균일성에 의해 인접한 취수 공간에도 지하수체의 이동 특성 및 화학적 특성이 달라질 수 있다. 본 연구는 이러한 불균질성을 박히기 위해 지하투과레이다(GPR)를 이용하여 부여 군수리 지역의 천부 충적층에 대한 퇴적학적 분석을 시도하였다. 군수리 지역은 크게 상하 두 개의 충적층으로 구분되며, 상부 수평층은 범람에 의해 형성된 것으로 수직 불균질성이 크고 수평 불균질성은 낮다. 하부 경사층은 수평, 수직 불균질성이 모두 크다. 특히 하부 경사층내에 발달한 하도곡은 인접한 충적층과 분리되어 이 층내의 지하수체 이동은 제한적일 것이고 수질 특성 또한 크게 다를 것으로 판단된다. 본 연구는 충적 대수층에 대한 물리 화학적 특성의 정확한 해석을 위해서 퇴적학적 해석이 선행되어야 함을 시사한다.

• Journal of the Economic Geographical Society of Korea
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• v.6 no.1
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• pp.119-144
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• 2003

This study attempts to figure out the impact of Information and communication technologies (ICTs) on spatial structure and to speculate on spatial strategies in the electronic economy from a geographical perspective. The unprecedented development of ICTs based on the explosive use of the Internet was enough to lead to the expectation that physical distance would not be a significant barrier in business activities. In fact, however, at least at a current stage, the development of ICTs has not automatically removed the inequality in spatial structure. The accessibility to electronic space is different by economic and social status within a country as well as between countries. The importance of place, locality, and place-specific assets has been strengthened in the global economy. Physical proximity is still of great importance because it helps to minimize transaction costs, to exploit place-specific social networks, and to accumulate credibility for successful businesses. Likewise, the development of electronic commerce such as B2B and B2C EC also does not necessarily result in the ignorance of place and locality. Rather, the recognition of the importance of spatial strategies is extremely important for the success in online businesses. As a conclusion, the spatial dimension becomes more important in the digital era for successful businesses and balanced regional developments than ever before. The need for the improvement of ICT infrastructures, the development of human resources, and the establishment of regional innovation systems in peripheral areas cannot be overemphasized even in the digital era.

• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.1191-1195
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• 2010

도달시간 또는 집중시간이란 어떤 유역에 강우가 발생하였을 때 유역의 최상류부에서 내린 강우가 유역의 최하류부 출구점까지 도달하는 데 소요되는 시간으로 정의된다. 일반적으로 유역출구점에서의 첨두홍수량은 도달시간만큼 지체되어 발생하고, 하천의 치수 시설물을 설계하는데 있어 기준이 되므로 정확한 홍수도달시간의 산정은 매우 중요한 과업 중 하나이다. 현재 국내에서는 Kirpich 공식, Rziha 공식, Kraven 공식, SCS(NRCS; Natural Resources Conservation Service) 공식 등을 이용하여 도달시간을 산정한 후 그 유역에 적절한 것을 채택하는 방식으로 홍수도달시간을 산정하고 있다. 이러한 경험식들은 모두 유역의 지배적인 유로의 연장과 하도경사에 의해 결정되어 홍수의 이동특성을 물리적으로 반영할 수 없으며, 유역면적이나 하도 경사에 따라 적용성이 한정되어 있다. 또한 각 경험식들에 따라 산정된 도달시간은 경우에 따라 수십 배의 차이가 나타날 수도 있다, 따라서 본 연구에서는 보다 정확한 유역의 홍수도달시간을 산정하기 위하여 상세 지형정보를 이용하며, 임의의 격자점에 내린 강우의 흐름방향을 결정하고 인접 격자점에서 유입되는 홍수의 이동경로를 보다 물리적이고 현실적으로 모의하고자 하였다.

• Journal of the Korean Association of Geographic Information Studies
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• v.25 no.1
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• pp.28-43
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• 2022

This study classified UAV image-based physical spatial types for parks in urban areas of Changwon City and analyzed thermal comfort characteristics according to physical spatial types by comparing them with ENVI-met thermal comfort results. Physical spatial types were classified into four types according to UAV-based NDVI and SVF characteristics. As a result of ENVI-met thermal comfort, the T_MRT difference between the tree-dense area and other areas was up to 30℃ or more, and it was 19. 6℃ at 16:00, which was the largest during the afternoon. As a result of analyzing UAV-based physical spatial types and thermal comfort characteristics by time period, it was confirmed that the physical spatial types with high NDVI and high SVF showed a similar to thermal comfort change patterns by time when using UAV, and the physical spatial types with dense trees and artificial structures showed a low correlation to thermal comfort change patterns by time when using UAV. In conclusion, the possibility of identifying the distribution of thermal comfort based on UAV images was confirmed for the spatial type consisting of open and vegetation, and the area adjacent to the trees was found to be more thermally pleasant than the open area. Therefore, in the urban planning stage, it is necessary to create an open space in consideration of natural covering materials such as grass and trees, and when using artificial covering materials, it is judged that spatial planning should be done considering the proximity to trees and buildings. In the future, it is judged that it will be possible to quickly and accurately identify urban climate phenomena and establish urban planning considering thermal comfort through ground LIDAR and In-situ measurement-based UAV image correction.

• The Journal of Korean Physical Therapy
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• v.9 no.1
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• pp.177-184
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• 1997

1. The human body is the unification related to the powerful fascial network, I think. 2. Myofascial not only prevent and support the human body structure curdling but also keep the physical balance by dispersing traumatization properly. 3. Myofascial restriction will be developed into muscle deficiency and cause pains without releasing the muscle tension and the spasm. 4. Myofascial restriction affect and change the physical posture by losing the muscle elasticity and flexibility and by losing muscle supporting ability from gravitation. 5. The partial myofascial restriction affect the muscle and the adjoining joint supporting gravitation and cause the unbalance of the entire body.