• Journal of the Korean association of regional geographers
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• v.8 no.4
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• pp.492-512
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• 2002

The daily life activities of primary school children have been increasingly diversified. This research examined the spatio-temporal characteristics of primary school children's daily life activities. The time allocation of primary school children's daily activities was monotonous. They tended to spend most of their time in school activities, private lessons after school, and studying at home. The daily trip to school has been diversified as the result the of increase in the number of double-income families, car owners, facilities for pastime, and educational facilities for private lessons after school. The selection of educational facilities for private lessons was strongly influenced by accessibility to the residence because of the limited time budget of primary school children and the controlled trip behavior by parents. The leisure activities were considered as a minor function and took place in the interval of performances of study-related activities. The high proportion of leisure activities was found in the indoor play. The amount of the time for leisure activity was very insufficient. The spatial range and time budget were strongly influenced by the institutional conditions of parents.

• Journal of the Korean Association of Geographic Information Studies
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• v.15 no.1
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• pp.133-143
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• 2012

The purpose of this study is to investigate the characteristics of urban heat island considering urban space at nighttime. We used to analyze landuse and landcover data of 1:1,000 scale, DTM, and surface temperature extracted ASTER image satellite of nighttime. According to the analytical results, heat intensity in single-family residential is higher than that in industrial area, public facility area, and commercial area because the anthropogenic heat by energy consumption is released. Likewise, the temperature difference were big in the buildings of industrial area depending on operating hours. Meanwhile, green and river area had cooling impacts mitigating the urban heat island. Therefore, we have to mitigate heat intensity through constructing green space and waterfront area. As mentioned above, we think that the results of this study will be used as base data for effective spatial planning when formulating development planning to mitigate urban heat island at nighttime.

• Journal of Korean Ophthalmic Optics Society
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• v.3 no.1
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• pp.269-277
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• 1998

The TSDC(Thermally Stimulated Depolarization Current) measurement were carried out in the temperature range $30{\sim}500^{\circ}C$. We observed the anomalous two peaks that have a thousand times longer relaxation time than that of the space charge. It seems that the origin of the two peak are due to the electron trapping effect and to the adsorption of the vacancies at silver electrode.

• Proceedings of the Korean Society for Cognitive Science Conference
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• 2002.05a
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• pp.119-124
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• 2002

공간적 관계정보(spatial relation)가 언어적 표상시스템과 비언어적 표상시스템에서 어떻게달라지는가를 범주화 모델의 원형이론 모델을 적용하여 알아보고자 하였다. 이전의 연구들에 따르면 공간적 관계정보에 대한 프로토타입이 언어적 범주와 비언어적 범주에서 다르다는 연구 결과(Crawford 등 2000, Huttenlocher 등 1991)와 동일하다. (Hayward & Tarr 1995)는 상반된 연구 결과가 제기되고 있다. 하지만 이전 연구들에서의 문제점은 언어/비언어 표상체계 간의 편향을 통제하지 못했기 때문에 과제에 따라 서로 다른 결과가 나온 것이라고 볼 수 있다 본 연구에서는 두 대상간의 관계정보를 문장으로 제시한 조건, 그림으로 제시한 조건, 그리고 두 조건을 혼합한 조건을 사용하여 편향에 의한 효과를 제거하고자 하였다. 실험은 각 조건에 따라 짝으로 구성된 자극을 학습한 후 검사자극을 공간적 관계정보를 다양하게 하여 학습자극과 동일한지 아닌지를 판단하게 하였다. 실험결과 관계정보를 언어적으로 제시한 조건과 비언어적으로 제시한 조건간에 대상의 위치에 따른 반응시간의 경향성에서 차이가 없었으며, 대상이 단어인지 그림인지에 따라서 반응시간에서 통계적으로 차이가 나타났다. 그리고 두 표상체계에서 공간적 관계에 대한 프로토타입을 분석한 결과 수직축을 중심으로 전형성 효과가 나타나는 것을 알 수 있었다.

• Spatial Information Research
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• v.20 no.6
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• pp.139-144
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• 2012

The R*-tree manages hierarchical nodes for efficient access of spatial data. We propose a method that maintains partial nodes of R*-tree in the GPU memory to improve efficiency using parallel processing. The proposed method attempts to load as many nodes as possible to the GPU memory. The new nodes are inserted to manage the rest of R*-tree nodes in the main memory. The experimental result shows that the proposed method is more efficient than the main memory based R*-tree.

• The Journal of the Korea Contents Association
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• v.6 no.12
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• pp.121-127
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• 2006

As information technologies are improving, geographical information system (GIS) technologies are also developing rapidly and demands for spatial analysis with GIS are increasing. Particularly, the spatial analyses with GIS researches have been noted rather than general GIS researches. However, most GIS researches focus on space dimension: a density-based clustering method (DBSCAN) or a DBSCAN algorithm using region expressed as Weight (DBSCAN-W) but the importance of rational decision making based on time dimension has been neglected. This study adopts system dynamics in order to put time dimension in GIS-based optimum allocation.

• Journal of Korean Society for Geospatial Information Science
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• v.25 no.2
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• pp.67-74
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• 2017

The D-InSAR is a technique for precisely measuring the subsidence of subsidence using difference of two SAR images. In order to calculate the subsidence using D-InSAR, a high coherence between master image and the slave image is essential. Since the existing D-InSAR method calculates the displacement based on the total coherence, the accuracy of the subsidence is lowered when the coherence map contains mountains or bare-land. In order to solve this problem, in this study, a point having a temporal coherence and spatial coherence of 0.7 or more was extracted to form TIN, and the subsidence was calculated based on this TIN. In addition, we compared the existing D-InSAR technique with the new D-InSAR technique considering spatial and temporal coherence. As a result, the new D-InSAR technique showed smaller standard deviation, relative variance, variation coefficient and quadrature deviation than the existing D-InSAR technique. It is also easy to grasp the trend of the subsidence.

• Journal of Korean Home Economics Education Association
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• v.15 no.4
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• pp.37-53
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• 2003

이 연구는 고등학교 $\ulcorner$기술ㆍ가정$\lrcorner$주거 공간 꾸미기 단원의 교수-학습을 위한 WBI 프로그램을 개발하고 평가하는 데 목적이 있다. 이 연구는 WBI 프로그램을 개발하여 주거 공간 꾸미기 단원의 교과 내용을 학습하고 HOME DESIGN 응용 프로그램을 이용하여 실습함으로써 제 7차 교육과정에서 강조하는 웹 기반 수업과 개별학습을 하는 데 활용될 수 있을 것이다. 프로그램은 ADDIE 모형을 중심으로 학습 내용 선정, WBI 프로그램 설계, WBI 프로그램 개발 수업 적용, 평가 과정을 거쳐 개발하였다. 우선 $\ulcorner$기술ㆍ가정$\lrcorner$6개 교과서의 주거 공간 꾸미기 내용을 정리하고 그 내용을 바탕으로 HTML과 PHP, MySQL로 데이터베이스를 구축하여 학습자와 컴퓨터와의 역동적인 상호 작용이 이루어지도록 설계하였다. 또한 온라인의 개별 학습이 가능하도록 주메뉴를 교과서 연구실, 3D 홈 디자인 실습실, 자료 공유실, 종합 평가실의 네 부분으로 구성하여 이론을 약 6시간 동안 학습하고 나서 3시간 동안 실습을 할 수 있도록 하였다. 개발된 프로그램을 수정 보완하고 프로그램의 질을 높이기 위한 목적으로 청주시 C고등학교 1학년 학생 35명과 가정과 교사 3명을 대상으로 시범 적용한 결과를 바탕으로 프로그램의 작동 여부를 화인하고 오류를 고쳐 프로그램의 문제점을 개선하였다. 본 프로그램을 이용한 회원은 4월 20일부터 6월 1일까지 2개 고등학교 학생 70명, 11개 고등학교 교사 11명이었다. 평가 결과 교사들은 본 프로그램에서 가장 유용하게 이용한 부분으로 ‘3D 홈 디자인 실습실(63.6%)’, ‘교과서 연구실(18.2%)’, ‘게시판. 자료실, 묻고 답하기 등(18.2%)’ 순으로 답한 반면 학생들은 ‘3D 홈 디자인 실습실(47.8%)’, ‘교과서 연구실(34.3%)’, ‘게시판, 자료실, 묻고 답하기 등(17.9%)’의 순으로 답하여 유용한 부분에 대한 순서는 일치하나 비율에 차이가 있어 교사들이 ‘3D 홈 디자인 실습실(63.6%)’을 더 유용하게 이용했음을 알 수 있었다. 또한 프로그램을 사용하는 데 있어 교사는 ‘쉬운 편이다’라는 응답이 63.6%로 학생의 24.2% 응답과 차이가 있었으며, 제시된 학습 내용의 양이 ‘적당하다’에 교사가 63.6%, 학생이 48.4%로 답하여 차이가 있었다. 그리고 교사들은 화면 구성이 ‘잘 구성된 편이다(72.7%)’,‘평상시 수업보다 이해에 도움이 되었다(81.2%)’로 답하여 교사들이 학생들보다 본 프로그램에 더 긍정적인 반응을 보였음을 알 수 있었다. 프로그램에 대한 장점과 개선할 점에 대한 개방형 평가는 교사들의 평가와 유사하여 ‘재미있어서 시간이 부족했다’, ‘잘하지는 않았지만, 직접 디자인해서 재미있었다’, ‘어른이 되면 주거 공간 활용을 잘 할 것 같다’, ‘새로운 경험이라 재미있었다’, ‘흥미롭고 재미있었다’, ‘쉽게 되어 있어 좋다’, ‘가구 배치가 잘 되었고. 흠 디자인한 색상이 잘 맞는다’라는 의견이었다. 그러나 주거 공간 꾸미기 WBI 프로그램을 이용한 수업이 컴퓨터에 대한 소양이 부족한 학생과 집중력이 떨어지는 학생에게는 다소 어려움이 있으므로 학생들의 개인차와 학교 실정에 따른 시간 배당 등을 고려하여 학생의 개별학습과 아울러 학교에서 교사의 설명과 함께 수업 시간에 활용할 것을 제안한다.

• Journal of the Korean Geographical Society
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• v.43 no.3
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• pp.358-374
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• 2008

This study examines whether and how ages of child affect accessibility experiences of women and men differently. Space-time accessibility measures based on Time-geographic framework with activity-travel diary datasets in Portland Metro, US were calculated using GIS-based geocomputation, and spatial-temporal patterns of accessibility of dual-earner couples by ages of their youngest child were compared. The results are as follows. (1) Although more women than men work part-time, which would render women more spatial-temporal autonomy, accessibility levels of women are not higher than men's. It implies that there exists another constraint placed on women which largely stems from gender inequality. (2) It is distinctively women with child under age 6 of which accessibility spaces are found to be restricted doser to home compared to men. Women with no child or with child aged over 6, however, show more or less similar spatial-temporal patterns of accessibility with men's which are quite unvarying regardless of parental status and their child age. Women's accessibility experiences characterized by spatial-temporal entrapment, thus, can be seen as problems associated with gender rather than sex. (3) Intensified spatial-temporal entrapment of women with young child are associated with the significant spatial pegs shaping their accessibility spaces, which are located much closer to home compared to men's: workplaces and child's daycare centers.

• Journal of the HCI Society of Korea
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• v.13 no.2
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• pp.5-20
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• 2018

The fully autonomous vehicle, which has been actively studied in a worldwide before commercialization, is expected to become a living space by securing time and space compared to existing automobile. For this reason, interior design of fully autonomous vehicle has become very important. To enhance passenger's experience and satisfaction in fully autonomous vehicle, it is necessary to design an optimized space that can support in-vehicle activities. For this purpose, efforts to analyze the passenger's in-vehicle activities should be preceded. However, there were limited studies that define space and in-Vehicle activities of fully autonomous vehicle in Korea. The purpose of this study is to suggest the guideline of the interior design of fully autonomous vehicle by analyzing and classifying the scope of activities that the passenger can perform within the vehicle. As a method of the study, literature studies on future concept cars, human lifetime behavior and consumer needs had been conducted. As a result in-vehicle activities could be applied in a fully autonomous vehicle. Four in-vehicle activities 'work', 'home life and personal care', 'relaxation' and 'conversation and hobby' had been derived through the analysis of in-vehicle activities. Based on the results, the interior design of fully autonomous vehicle guideline has been suggested. The study is significant because the result of the study can act as a basic study which considers the activities in the fully autonomous vehicle environment.