• Proceedings of the Korean Information Science Society Conference
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• 2005.07b
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• pp.121-123
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• 2005

최근 LBS(Location Based Service) 밑 텔레매틱스 응용의 효과적인 지원을 위해, 도로, 철도와 같은 공간 네트워크 데이터베이스에 관한 연구가 활발히 수행 중에 있다. 한편 공간 네트워크 데이터베이스에 대한 효율적인 접근을 위해, 공간 네트워크 자체의 데이터, POI 데이터, 이동 객체 데이터를 효율적으로 저장 및 색인하는 구조가 설계되었다[1]. 따라서 본 논문에서는 설계된 공간 네트워크 데이터베이스를 위한 저장/색인 구조를 구현하고 이를 공간 네트워크 자체의 데이터 검색, POI 데이터 검색, 이동 객체 궤적 검색 관점에서 성능평가를 수행한다. 아울러 기존에 연구되었던 접근 기법과 검색 성능을 비교한다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.256-258
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• 2005

최근 유비쿼터스 컴퓨팅 기술이 활발하게 연구되고 있는 실점에서 상황인지 (Context Aware)에 의한 위치 기반 서비스 (LBS : Location Based Service)와 POI(Point of Interest) 서비스가 활발히 연구되고 있다. 그러나 실외 위치 측위를 위한 GPS의 이용이 불가능한 실내 이동 환경에서는 사용자의 위치 변화 인지가 불가능하므로. 실내에서의 위치 기반 서비스를 위해서는 실내 환경에 적합한 위치측위 방식을 고려하여야 한다. 최근 물류 관리나 사용자 인증 등에 주로 사용되고 있는 RFID (Radio frequency IDentification)는 비접촉 인식 기술로서 위치 ID를 이용하여 실시간으로 실내의 위치 변화에 반응하도록 함으로써 실내 측위 시스템으로의 응용이 가능하다. 본 연구에서는 RFID를 이용해 실시간으로 위치 ID를 인지해 실내 위치 정보를 획득하고, XML 웹서비스와 벡터기반의 SVG를 이용하여 이동 클라이언트인 PDA에 사용자 위치정보를 적용한 실내 공간 정보 서비스 및 POI 서비스가 가능하도록 실내 위치 측위 시스템을 설계하고 구현하였다.

• Spatial Information Research
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• v.18 no.3
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• pp.53-62
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• 2010

Recent development in wireless communication technology, like GPS, and mobile equipments, like PDA and cellular phone, make location-based services (LBSs) popular. However, because, users continuously request a query to a server in the LBSs by using their exact locations, privacy information could be in danger. Therefore, a mechanism for users' privacy protection is required for the safe and comfortable use of LBSs by mobile users. For this, we, in this paper, propose a grid-based cloaking area creation scheme supporting continuous LBSs in peer-to-peer environment. The proposed scheme creates a cloaking area by using Chord protocol, so as to support the continuous LBSs in peer-to-peer environment. Finally, we show from a performance analysis that our cloaking scheme outperforms the existing cloaking schemes, in terms of service time.

• Journal of Digital Contents Society
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• v.18 no.5
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• pp.803-810
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• 2017

Currently, every person possesses a smart phone due to the development of the IT industry. There is an improper situation in which a smart phone is not set in silent mode, such as a lecture room, a library, and a theatre hall. The proposed system automatically automates the function of smart phones where they are designated as a public place or etiquette area and automatically return the function of the smartphone if they deviate from the location of the site. It is also equipped with a combination of autonomous devices and services, based on Bluetooth communications, which are applied to ultra-light low-power IoT(Internet of Things) devices, and has features that allow diverse types of features and services to be added without requiring deformation of the hardware.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.8
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• pp.663-673
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• 2013

The drastic growth of mobile communication and spreading of smart phone make the significant attention on Location Based Service. The one of most important things for vitalization of LBS is the accurate estimating position for mobile object. Focusing on IMU deployed in smart phone, we develop a hybrid positioning estimation framework with a combination of WPS. The developed approaches can strengthen the advantages of independent indoor applicability of IMU. The estimation of IMU is efficiently compensated by radio fingerprint based Wi-Fi Positioning System. We put a focus especially on the hybrid algorithmic framework. Compared on the existing approaches of WPS or IMU, we achieve the comparable higher performance on both of average error of estimation and deviation of errors. Furthermore test-bed based on smart phone platform is practically developed and all data have been harvested from the actual measurement of test indoor area. This can approve the practical usefulness of proposed framework.

• Archives of design research
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• v.20 no.3 s.71
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• pp.151-162
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• 2007

How can new media devices and networks provide an effective response to the world's growing sector of cultural and historically-minded travelers? This study emerged from the question of how mobile handsets can change the nature of cultural and historical tourism in ubiquitous city environments. As wireless network and mobile IT have rapidly developed, it becomes possible to deliver cultural and historical information on the site through mobile handset as a tour guidance system. The paper describes the development of a new type of mobile tourism platform for site-specific cultural and historical information. The central objective of the project was to organize this cultural and historical walking tour around the mobile handset and its unique advantages (i.e. portability, multi-media capacity, access to wireless internet, and location-awareness potential) and then integrate the tour with a historical story and role-playing game that would deepen the mobile user's interest in the sites being visited, and enhance his or her overall experience of the area. The project was based on twelve locations that were culturally and historically significant to Korean War era in Busan. After the mobile tour game prototype was developed for this route, it was evaluated at the 10th PIFF (Pusan International Film Festival). After use test, some new strategies for developing mobile "edutainment content" to deliver cultural historical contents of the location were discussed. Combining 'edutainment' with a cultural and historical mobile walking tour brings a new dimension to existing approaches of the tourism and mobile content industry.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.884-887
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• 2009

Social Network Service has been extremely popular these days and providing diverse features and functions to users. Social networking and interest sharing in between users are key factors of SNS and this circles back to draw more users to the service. Web is the first media to provide SNS and mobile is the next. The service based on mobile environmental uniqueness such as Location-based-service(LBS) is the key success factors to convert users to web SNS to mobile SNS. TV has also been a possible SSN market to draw users to share interests and participation. However TV has been always community electronics in family members and personalization to provide SNS has been barrier to overcome. In this study, we explorer ideas of key factors of personalization in TV environment and conducted a field study to define characteristics of TV personalization in terms of depth, method, style and structure. Research finds out that there are significant differences in these categories.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.270-273
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• 2011

스마트폰의 확산으로 스마트폰에 내장된 다양한 센서를 활용한 상황인지 서비스가 고도화 되어가고 있다. 이와 관련하여 GPS 센서, WiFi AP, Cell Tower 등의 정보를 이용하여 사용자의 위치를 파악하는 연구와 LBS(Location Based Service)에 대한 연구들이 이루어지고 있다. 하지만, 기존의 GPS 등과 같은 위치 센싱 정보를 통한 위치 파악 방법은 인프라를 구축하는 비용이 소요되고, 상대적으로 부정확한 장소 정보를 반환하는 문제점이 있다. 본 연구에서는 스마트폰으로부터 수집된 사용자의 시간, 요일, 장소, 주변 동시 출현 사용자 정보 등과 같은 사용자 상황 로그를 학습하여 사용자의 장소를 추론 하는 연구와 사용자의 프로파일을 이용하여 사용자를 그룹화한 장소 추론 모델을 통해 사용자의 장소 추론 정확도를 개선하는 방법을 제안한다. 제안 방법의 성능 평가를 위해 Reality Mining Project 그룹에서 수집된 데이터셋을 사용하여 전체 사용자를 대상으로 주변 동시 출현 사용자 속성을 이용한 방법과 사용자 주변에서 동시 출현하는 사용자의 빈도가 유사한 사용자별로 그룹화한 장소를 추론하는 방법을 비교 실험하였다. 실험 결과, 전체 사용자를 대상으로 장소를 추론하는 방법에 비해 유사 사용자 군집별로 장소를 추론하는 방법의 분류 정확도가 향상되었음을 확인하였다.

• Journal of Institute of Control, Robotics and Systems
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• v.20 no.7
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• pp.774-781
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• 2014

This paper presents a fingerprint database construction method for WLAN RSSI (Received Signal Strength Indicator)-based indoor positioning. When RSSI is used for indoor positioning, the fingerprint method can achieve more accurate positioning than trilateration and centroid methods. However, a FD (Fingerprint Database) must be constructed before positioning. This step is a very laborious process. To reduce the drawbacks of the fingerprint method, a radio propagation model-based FD construction method is presented. In this method, an FD can be constructed by a simulator. Experimental results show that the constructed FD-based positioning has a 3.17m (CEP) error. In this paper, a spatial correlation method is presented to estimate the NLOS(Non-Line of Sight) error included in the FD constructed by a simulator. As a result, the NLOS error of the FD is reduced and the performance of the error compensated FD-based positioning is improved. The experimental results show that the enhanced FD-based positioning has a 2.58m (CEP) error that is a reasonable performance for indoor LBS (Location Based Service).

• Journal of Information Processing Systems
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• v.16 no.4
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• pp.750-759
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• 2020

The wide application of various integrated location-based services (LBS social) and tourism application (app) has generated a large amount of trajectory space data. The trajectory data are used to identify popular tourist attractions with high density of tourists, and they are of great significance to smart service and emergency management of scenic spots. A hot spot analysis method is proposed, based on spatial clustering of trajectory stop points. The DBSCAN algorithm is studied with fast clustering speed, noise processing and clustering of arbitrary shapes in space. The shortage of parameters is manually selected, and an improved method is proposed to adaptively determine parameters based on statistical distribution characteristics of data. DBSCAN clustering analysis and contrast experiments are carried out for three different datasets of artificial synthetic two-dimensional dataset, four-dimensional Iris real dataset and scenic track retention point. The experiment results show that the method can automatically generate reasonable clustering division, and it is superior to traditional algorithms such as DBSCAN and k-means. Finally, based on the spatial clustering results of the trajectory stay points, the Getis-Ord Gi* hotspot analysis and mapping are conducted in ArcGIS software. The hot spots of different tourist attractions are classified according to the analysis results, and the distribution of popular scenic spots is determined with the actual heat of the scenic spots.