• Journal of the Korean Regional Science Association
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• v.37 no.4
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• pp.3-19
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• 2021

This study examines changes in commercial space in Seoul from 1999 to 2016 by investigating operating periods of commercial businesses. This study finds that the characteristics of spatial changes in commercial districts are classified by the following two major points. First, the traditional CBD and Yeongdeung-po commercial districts show that both ages (survival duration) of operating commercial businesses and operating periods of market-exit businesses have changed to become longer than the average values of the two business types in Seoul. In contrast, the Gangnam and the Mapo commercial districts show that the operating periods of survived and closed commercial businesses have changed to become shorter over time. The difference suggests that survival-exit relations of businesses are closely related to the characteristics of each commercial district. In addition, this study shows that each commercial district has experienced dynamic changes in the intensity of commercial activities and the hierarchy of commercial space. Finally, this study indicates that public policies for commercial space should consider survival-exit dynamics of commercial activities in commercial districts.

• The Korean Journal of Applied Statistics
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• v.34 no.3
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• pp.507-521
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• 2021

Detecting outliers among high-dimensional data encounters a challenging problem of screening the variables since relevant information is often contained in only a few of the variables. Otherwise, when a number of irrelevant variables are included in the data, the distances between all observations tend to become similar which leads to making the degree of outlierness of all observations alike. The subspace outlier detection method overcomes the problem by measuring the degree of outlierness of the observation based on the relevant subsets of the entire variables. In this paper, we survey recent subspace outlier detection techniques, classifying them into three major types according to the subspace selection method. And we summarize the techniques of each type based on how to select the relevant subspaces and how to measure the degree of outlierness. In addition, we introduce some computing tools for implementing the subspace outlier detection techniques and present results from the simulation study and real data analysis.

• Journal of Digital Convergence
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• v.16 no.11
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• pp.45-55
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• 2018

The purpose of this study was to provide the necessary data to explore the development plans of consumer organizations by looking at the spatial distribution of consumer organizations. This is because community-based consumer organizations can propose concrete measures to solve consumer problems more effectively. In this study, data of 11 consumer organizations and 815 branches were collected and analyzed using local indicators of spatial distribution and spatial lag model. First, it was difficult to find patterns according to the geographical characteristics of the spatial distribution of consumer organizations. Second, consumer organizations were more distributed in areas with large populations and businesses and large areas. Third, there is a discrepancy between the demand and supply of consumer organizations when compared with the number of consumer counseling. Based on this, it is necessary to constantly seek concrete development plans by supplementing the qualitative data on the activities of consumer organizations.

• Korean Journal of Culture and Social Issue
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• v.11 no.4
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• pp.83-95
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• 2005

The purpose of the present study was to investigate the relationship between spatial-erceptual ability and several aspects of driving-related situation awareness(in particular, recognition and prediction). Video clips of real driving were used in both recognition and prediction tasks, and the digit calculation task during driving the simulator was required as the integration task of recognition and prediction. The results showed that the subjects of higher spatial-perceptual ability performed better in recognition task, especially in terms of sensitivity measured in d'(as signal detection theory), prediction task, and digits calculation performance than those of lower spatial-perceptual ability.

• The Journal of the Korea Contents Association
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• v.12 no.10
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• pp.63-71
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• 2012

Depth understanding is important for stereoscopic and various methods including space design and cognitive science should be taken account in contents production. Among them, human scientific engineering such as human factor needs to be touched. More specifically, when the stereoscopic designer determines a binocular disparity, the viewpoint of the camera has to be matched with that of the audience. In this process, the structural problem by the distortion due to the dichoptic error is happened, Therefore, 3D sweetening process based on geometric re-analysis and human scientific engineering to minimize the visual fatigue is significant. This paper analyzes the inconsistency problems of the viewpoint in stereoscopic images, and we produce the stereoscopic image contents based on human factors.

• Journal of Korea Water Resources Association
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• v.32 no.5
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• pp.515-524
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• 1999

A methodology to resolve a TOPMODEL problem has been suggested, which is associated with the spatial distribution of soil moisture behaviour in a runoff mechanism. A procedure to integrate the spatial information of saturation deficit in the TOPMODEL reflects the connectivity of saturated area in a watershed. The developed algorithm includes an improved basis in tracing the runoff path without increasing the number of parameters. The performance of the developed algorithm has been tested to an upland subwatershed, namely Dongok, which is the IHP watershed located at Wichon, Korea. Comparing with the original statistical version of the TOPMODEL, it has been found that the suggested algorithm can relax an overestimation of peak rate in the runoff simulation.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.188-192
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• 2009

2002년의 태풍 루사와 2003년의 태풍 매미 이후 수공구조물의 설계기준에 대한 관심이 커지고 있는 가운데, 댐 설계기준인 가능최대강수량 및 가능최대홍수량 산정의 일관성에 대한 문제가 제기된 바 있다. 그러나 이러한 문제들은 우리나라의 전반적인 기후, 강수형태, 지형 등을 종합적으로 고려하고, 장기간에 걸쳐 진행되어야 할 연구로 단기간 내의 분석을 통한 해결책 제시는 어렵다고 할 수 있다. 본 연구에서는 가능최대강수량의 공간분포 시 등우선 배치에 따른 가능최대강수량의 면적별 감소율을 분석하여 제시하고자 한다. 이를 위해 우리나라의 대표 유역인 한강 유역, 낙동강 유역, 금강 유역의 수자원단위유역을 기준으로 유역면적과 배치된 등우선 면적간의 차에 대한 가능최대강수량의 감소율을 분석하였다. 이때 대상유역별 가능최대강수량은 국토해양부에서 제공하는 가능최대강수량도에서 값을 읽었고, 가능최대강수량의 포락방법에 따라 기존 방법 및 Horton 경험식과 spline식을 이용하는 경우로 구분하여 공간분포 방법을 적용하였다. 그 결과 기존에 사용하고 있는 포락방법을 적용하여 가능최대강수량을 산정한 경우에는 한강, 낙동강, 금강 유역의 지속기간별 면적차에 대한 감소율을 회귀식의 형태로 도출할 수 있었으나, Horton 경험식과 spline 방법을 이용하여 포락을 수행한 경우에는 PMP의 감소량 및 감소율은 지속기간, 면적차 또는 면적차비율에 대해 뚜렷한 경향성을 나타내지는 못하는 것으로 분석되었다.

• Journal of Korean Society for Geospatial Information Science
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• v.18 no.3
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• pp.91-96
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• 2010

Depending on the transportation, information and communication technology development, urban such as the superficial spreading and the changing structure of internal space of the organism has various shape and speed of the changes. In particular, the main cause of these changes is the development of the traffic and this transport system is having a close connection with land use. This study presents the results about characteristics and changes of noise on each land use zoning. Therefore the result shows that the measured data could be used to evaluate noise distributions on urban land use and then make up the basis process for producing noise maps of land use zoning.

• Journal of KIISE:Computing Practices and Letters
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• v.16 no.4
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• pp.487-491
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• 2010

In this paper we propose a new single-query path planning algorithm for working well in high-dimensional configuration space. With the notice of the similarity between single-query algorithms with exploration algorithms, we propose a new path planning algorithm, which applies the Remembering Exploration method, which is one of exploration algorithms, to a path-planning problem by selecting a node from a roadmap, finding out the neighbor nodes from the node, and then inserting the neighbor nodes into the roadmap, recursively. For the performance comparison, we had experiments in 2D and 3D environments and compared the time to find out the path. In the results our algorithm shows the superior performance than other path planning algorithms.

• Journal of Digital Contents Society
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• v.10 no.3
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• pp.395-400
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• 2009

The wide spread of the Internet service has brought in web GIS development. But, there are problems of the user access latencies, the network traffic, and the server overload in Internet Geographic Information System because spatial data are transferred in large volumes. In this paper, I propose a cache algorithm on client side to solve the above problems. The proposed algorithm demonstrates the performance improvement over known studies by utilizing unit time and spatial proximity. In addition, this paper conducts a performance evaluation to measure the improvement in algorithm efficiency and analyzes the results of the performance evaluation. When spatial data queries are conducted, according to our performance evaluation, hit rate has been improved over the existing algorithms.