• Journal of KIISE:Databases
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• v.31 no.3
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• pp.219-231
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• 2004

Recently, together with increasing use of multimedia data, many works on moving objects in video databases have been made. Moving objects change visual features and spatial positions with the lapse of time in video data. And they arc related to the other objects or events. In this paper, we propose a new modeling and various query types of moving objects for content based retrieval in video databases. The proposed modeling represents visual features, moving trajectories and semantic contents related to objects. Therefore, it allows to process various query types. And we propose various query operators for the retrieval types. To show the superiority of our modoling, we implement the retrieval systems and compare it with the existing methods in terms of the supporting query types. The proposed method supports various query types and improves the efficiency of the query processing over the existing methods.

• Journal of The Korean Association For Science Education
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• v.31 no.6
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• pp.986-997
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• 2011

In this study, we developed analogical experimental activities to foster scientific creativity in inquiry learning and applied them to 7th grade science-gifted students. The influences of inquiry learning-based analogical experiments were investigated with respect to the experimental design processes. We classified the patterns of experimental design processes by creative thinking processes and analyzed performance levels by the elements of experimental design processes. The students' experimental design processes were categorized into three kinds of patterns such as reinitiated motion, backward-divergent motion and stationary motion. Those belonging to the reinitiated motion performed precise experimental design from new perspectives by identifying the mapping in depth and considering the elements of experimental design processes. In the case of the backward-divergent motion, they shifted their positions to new directions, but the concreteness of experimental design was insufficient due to the lack of mapping or considering the elements. In the type of stationary motion, maintaining their previous positions, they showed less performance of experimental design without considering the elements sufficiently. Educational implication of these findings are discussed.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.1447-1449
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• 2007

본 논문은 이동 컴퓨팅 환경에서 시간 주기적인 인간의 행동 패턴에 따른 캐쉬 일관성 기법을 제안하고자 한다. 행동 유형 모델을 근거로 하여 시간 주기적인 행동의 패턴과 이동 기기의 사용 패턴이 동일 또는 흡사함을 가정한다. 이를 통해 패턴 예측 테이블을 구성하고, 시간대별로 구성된 테이블의 예측 데이터를 사용하여 서버와의 통신할 때 지연 현상을 방지 하는 기법을 제안한다.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.05c
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• pp.571-576
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• 1996

지하암반층에 처분한 방사성핵종들의 이동방식을 이해하기 위한 방법의 일환으로 다차원 불균일장에대한 모사기법에 대해 다루었다. 이차원 암반균열평면을 설정하고 균열틈 값이 공간적으로 다양한 형태를 가질 때 지하수가 흐르는 유형과 핵종들이 이동하는 특성을 이해하기 위해, 공간적으로 다양하게 변해 가는 균열틈을 가진 암반층을 모사한 다음, 여기서 지하수와 방사성핵종들의 흐름특성을 파악하고 물질이동에 영향을 미치는 중요한 수리학적 매개변수들에 대해 논의하였다. 암반 균열폭 값은 추계적 방식으로 설정한 확률밀도분포와 공간상호간섭길이를 함수로하여 통계적방식으로 계산하였다. 각 매개변수들의 값의 차이에 따라 달라지는 분포상태변화를 그림으로 표현하여 설명하였다.

• Journal of the Korean Regional Science Association
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• v.33 no.3
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• pp.101-113
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• 2017

This study examines the mobility of the disadvantaged population groups in terms of public transportation using the 2014 smart card data in Seoul, Korea. Particularly, we focus on the disadvantaged population such as senior group, junior group, and low-income population group. Based on the spatial distributions of public transportation mobility levels and the disadvantaged population groups, we identify specific areas where public transportation service should be improved for the disadvantaged population. As a result, we identify 15 administrative-dongs where the ratio of the disadvantaged population is high while the mobility index of public transit is low. The main contributions of this study are as follows. First, we use the smart card data which contains the information of actual trip made by individuals and develop the evaluation process of urban mobility for the disadvantaged population groups. Second, we identify the specific areas where public transportation service should be improved for the different group of the disadvantaged population. Lastly, we discuss policy implications to improve the urban mobility of the disadvantaged population.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.06a
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• pp.206-208
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• 2011

플로팅건축물은 최근 지구온난화에 따른 해수면의 상승, 소득 증대 및 관광행태 변화에 따라 급증한 해양 레포츠 수요에 대응하는 효과적인 건축물이다. 플로팅건축은 프로그램, 형태, 건축규모, 층수, 위치, 접근방법, 이동성, 에너지 자립도 등 8가지 기준에 따라 유형 구분이 가능하다. 또한 시공된 주거시설을 대상으로 분석한 결과 플로팅건축의 디자인 특성은 (1) 2층 규모, (2) 면적 비율이 높은 데크, (3) 장방형의 균형감 있는 매스, (4) 조망 극대화, (5) 친수공간 확보, (6) 공간의 통합적 사용 및 합리적 면적 배분의 평면계획, (7) 수면 반사를 고려한 단면계획, (8) 모듈화 및 유닛화 등으로 정리할 수 있다.

• The Journal of the Korea Contents Association
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• v.9 no.11
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• pp.335-347
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• 2009

This research analyzes the use intention of the ubiquitous service based on the technology acceptance model (TAM). This study investigates the characteristics of the ubiquitous service like the ubiquity, personality, connectivity, and location. The major results of this study are as follows. The ubiquity, connectivity, and location had positive influences on the perceived usefulness and perceived ease of use. And, the personality had the positive influence of the perceived ease of use. The perceived usefulness and perceived ease of use had the positive effect to an attitude, and the attitude had the positive effect to an use intention. When it consider the market share or the growth potential of the wireless internet service industry, this research results will be able to tilize as the basic information of an industry.

• Management & Information Systems Review
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• v.30 no.3
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• pp.133-151
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• 2011

This study investigates the moderating effect of customer type(deal prone/promotion insensitives) on the relationship between perceived values on the reward program of tele-communication firms and customer satisfaction. To test moderating effect, Difference test for distinct parameters in Amos 18.0 program was used. Results show that there is no the moderating effect of customer variable. But both kind of perceived values(utilitarian value and hedonic value) have a significant effect on customer satisfaction. For all customer, utilitarian reward has influenced on the customer satisfaction more than hedonic reward. And for utilitarian reward, promotion insensitives customer has influenced on the customer satisfaction more than deal prone customer.

• Korean Journal of Construction Engineering and Management
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• v.18 no.6
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• pp.57-64
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• 2017

Recently, the disaster situation has been diversified and compounded worldwide as well as in Korea. And the damage scale of each disasters have increased, and following economic loss is also increasing immensely. In Korea, especially the out break frequency of large-scale disasters has increased. Disasters caused by earthquakes are also very likely to occur. When a major accident such as Mauna resort collapse accident, Ferry sewol sinking accident occurred, systematic emergency medical care at the site at the time of disaster occurred in order to operate an emergency medical facility corresponding to the site, which is not systematic. The need for this service is urgent. If highly reliable emergency medical system function at appropriate times in the disaster site, secondary damage can be reduced and the whole situation would be back to normal shortly. Therefore, it is necessary to provide an emergency medical system capable of quickly and safely responding to disaster sites in relation to various damage scale. For the purpose, thorough analysis on mobile medical units of inside and outside the country was accomplished. As a result, Mobile Medical Unit of outside the country are trailer type, tent type, container type etc. At home, these types have been studied and will be proposed early next year as a temporary solution. Here we introduce suitable types for our country.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.6
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• pp.652-662
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• 2016

This paper proposes a user mobility management scheme which supports seamless service even if a user changes his accessing terminal in service in IP-based convergence network. Most of ongoing researches concerning mobility management as well as the existing mobility schemes have been focused to support terminal mobility. It is limited to support a variety of mobility types such as user mobility. The proposed scheme uses the mapping relationship between UID(User Identifier), user specific identifier and TID(Terminal Identifier), specific terminal identifier and forms packet address with user specific permanent 3 layer address for session continuity in case of user mobility. We numerically analyze and compare handover signaling cost between the existing user mobility scheme and the proposed scheme. The result shows that the proposed scheme has lower handover signaling cost than the existing one, [1].