• 한국컴퓨터정보학회논문지
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• 제27권12호
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• pp.161-169
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• 2022

최근 들어 모바일 디바이스와 GPS(Global Positioning System)의 발전으로 다양한 위치 기반 서비스(Location-Based Servises, LBS)를 활용할 수 있게 되었다. LBS 사용자는 서비스를 이용하기 위해 자신의 위치 정보를 서비스 제공자에게 노출한다. 이 과정에서 개인의 민감한 정보를 침해할 가능성이 있으므로 사용자의 위치 데이터를 변조하여 프라이버시를 보존할 수 있는 Geo-indistinguishability(Geo-Ind) 기법이 많이 활용되고 있다. 그러나 Geo-Ind 기법으로 인하여 사용자로부터 변조된 데이터를 수집하는 경우, LBS 제공자는 사용자 분포에 대한 정확한 정보를 얻을 수 없다. 그러므로 본 논문에서는 Geo-Ind 기법을 이용하여 사용자로부터 수집한 변조된 위치 데이터로부터 사용자 분포에 대한 정보를 정확하게 계산하기 위한 방법을 제안한다. 특히, Expectation-Maximization(EM) 기법을 이용하여 변조된 데이터로부터 사용자의 위치 분포를 정확하게 예측하기 위한 기법을 제안한다. 또한 실제 데이터를 이용해 제안 기법의 우수성을 입증한다.

• International Journal of Contents
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• 제13권1호
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• pp.22-30
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• 2017

The diffusion of advanced mobile technology has introduced new types of personal information or 'location data'. These new data mean new opportunities for businesses, such as location-based services (LBS), but have resulted in new consumer anxieties regarding disclosure of personal information. This study examines the effects of the consumers' perceived control over "time-andplace" information in location-aware services on their perceived privacy risk. A total of 270 respondents participated in this study. Conditions of perceived privacy control were operationalized over time-and-place information, in a $2{\times}2$ factorial design. Results indicate that the perceived control over time-and-place personal information is a significant predictor of perceived risk, and control assurances over time-and-place information enhances the perception of control, thus alleviating the perceived risk. In addition, the effect is much more significant when time and place were combined.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.2
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• pp.71-76
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• 2006

With the rapid development of spatial infrastructure in US, Europe, Japan, China and India, there is no doubt that the next generation Global Navigation Satellite System (GNSS) will improve the integrity, accuracy, reliability and availability of the position solution. GNSS is becoming an essential element of personal, commercial and public infrastructure and consequently part of our daily lives. However, the applicability of GPS in supporting a range of location-sensitive applications such as location based services in an urban environment is severely curtailed by the interference of the 3D urban settings. To characterize and gain in-depth understanding of such interferences and to be able to provide location-based optimization alternatives, a high-fidelity 3D urban model of Melbourne CBD built with ArcGIS and large scale high-resolution spatial data sets is used in this study to support a comprehensive simulation of current and future GNSS signal performance, in terms of signal continuity, availability, strength, geometry, positioning accuracy and reliability based on a number of scenarios. The design, structure and major components of the simulator are outlined. Useful time-stamped spatial patterns of the signal performance over the experimental urban area have been revealed which are valuable for supporting location based services applications, such as emergency responses, the optimization of wireless communication infrastructures and vehicle navigation services.

• Journal of information and communication convergence engineering
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• 제3권2호
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• pp.80-83
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• 2005

At present, GML becomes the global standard for the XML encoding of geographic information and is the foundation for the Geo-Web. GML is being applied to a wide range of geographic applications including GIS and location-based services, telematics and intelligent transportation systems. In this paper, we propose the tourism information system for supporting the location based service application. We made an effort to design and implement a GIS computing environment by thin client for mobile web mapping service. We are interested in the GML applications that include traditional GIS system for navigation service and location finder for points of interest (POI) services. This paper summarizes the Tourism information system for location based service of a small area (Han-Ok Village with the Korean traditional houses in Jeonju-city), in which moving travelers can obtain proper information services at the current location associated with traditional monuments, cultural products, food, and conveniences. In the paper, we report on the design of the thin client/server system for a mobile environment. This paper is divided into three parts. First, we give a general overview of the organization of the system and of the important concerns of our design. Second we focus on our system supports for location and POI determination, and design concerns. Finally, we show the graphic user interface of PDA, the procedures involved in the service, and the executed results.

• 한국통신학회논문지
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• 제31권9B호
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• pp.848-856
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• 2006

가입자의 위치정보를 기반으로 다양한 서비스를 제공하는 위치기반서비스(Location Based Service, LBS)는 구난신호 등의 공익적인 활용을 포함한 이용 활성화와 위치정보라는 개인정보에 대한 보호 강화의 측면에서 많은 관심을 받아왔다. 본 연구에서는 LBS 서비스의 비즈니스 모델을 위치정보흐름을 중심으로 구분하여 제시하고자 한다. 또한 비즈니스 모델 세부 유형별로 위치정보의 보호에 관련된 관점에서 검토를 한다. 마지막으로 LBS 서비스 비즈니스 모델의 성공을 위하여 필요한 LBS 서비스별 정보보호 문제 해결을 위한 고려사항에 대해 정리한다.

• Journal of Information Processing Systems
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• 제16권1호
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• pp.96-112
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• 2020

Solving the disclosure problem of sensitive information with the k-nearest neighbor query, location dummy technique, or interfering data in location-based services (LBSs) is a new research topic. Although they reduced security threats, previous studies will be ineffective in the case of sparse users or K-successive privacy, and additional calculations will deteriorate the performance of LBS application systems. Therefore, a model is proposed herein, which is based on geohash-encoding technology instead of latitude and longitude, memcached server cluster, encryption and decryption, and authentication. Simulation results based on PHP and MySQL show that the model offers approximately 10× speedup over the conventional approach. Two problems are solved using the model: sensitive information in LBS application is not disclosed, and the relationship between an individual and a track is not leaked.

• 대한교통학회지
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• 제27권2호
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• pp.73-82
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• 2009

컨시어지 서비스(Concierge Service)는 유비쿼터스 도시에서 제공되는 위치 기반 경로 안내 서비스이다. 유비쿼터스 도시는 언제 어디서나 모든 정보를 이용할 수 있는 도시이므로, 사용자는 컨시어지 서비스를 통해 언제 어디서나 자신의 위치 정보를 기반으로 경로를 안내받을 수 있다. 그러나 현재 제공 중인 경로안내 서비스는 GPS기반으로 위치정보를 결정하므로, GPS 음영지역이나 실내에서는 위치 정보를 얻기가 불가능하다. 실내에서의 위치 정보를 얻기 위해 유비쿼터스 컴퓨팅 시스템에서 여러 기술들을 이용한 연구가 활발히 이루어지고 있으나 아직까지 모든 곳에서 위치 정보를 얻을 수 있는 하나의 기술은 개발된 것이 없다. 그러므로 이러한 다양한 기술을 통하여 얻어지는 위치정보를 경로안내에 적용하기 위해서는 어떤 상황에서 얻어진 정보인지를 정의해줄 필요가 있다. 본 연구에서는 다양한 기술들을 통해 위치 정보를 얻을 수 있다는 가정 하에 컨시어지 서비스가 이루어지기 위한 기본조건들을 정의하고 위치정보활용을 위한 데이터구조의 표준안을 제안하였다. 이러한 표준안을 적용하면 어떤 기술을 통해 위치정보를 얻더라도 사용자는 어디서나 컨시어지 서비스를 이용할 수 있게 된다.

• Journal of Positioning, Navigation, and Timing
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• 제9권3호
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• pp.169-173
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• 2020

Location-based services are used as core services in various fields. In particular, in the field of public services such as emergency rescue, accurate location estimation technology is very important. Recently, the technology of tracking the location of self-isolation subjects for COVID-19 has become a major issue. Therefore, location estimation technology using personal smart devices is being studied in various ways, and the most widely used method is to use GPS. Other representative methods are using Wi-Fi, Pedestrian Dead Reckoning (PDR), Bluetooth Low Energy (BLE) beacons, and LTE signals. In this paper, we introduced a positioning technology using deep learning based on LTE Channel State Information-Reference Signal (CSI-RS) data, and confirmed the possibility through an outdoor location estimation experiment using a commercial LTE signal.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년 학술대회 논문집 정보 및 제어부문
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• pp.163-165
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• 2006

The subway passengers are usually alert to the current location of the train in order not to miss the destination or transfer stations. The Global Positioning System (GPS), although expensive, can give an alarm if properly programmed, but cannot receive the satellite signals, underground. Therefore, a novel approach to context-aware location-based subway information system is motivated. The passengers, who are equipped with mobile devices such as laptop, PDA, and mobile phone as clients of the Personal Area Network (PAN), request the Bluetooth connection to the server which is installed in each car of the train. While the sorrel broadcasts the location-based information including the previous station, the current velocity of the train, the distance and time to the next station, the clients provide additional services based on the recognized context of the information, and what the passengers individually want. The services are spontaneous and autonomous rather than passive. The services include not only the information on the nearby stations, exit numbers, connection buses but also the location-based alarms which can be set specific to various personal requests, and sounded by the location of the train rather than time. Whereas the arrival time may not be accurate due to the delays of the train, the location can be accurately traced and broadcast by the server. Also, the clients do not need any expensive systems like GFS. Towards validating the proposed approach, we implemented a Bluetooth PAN including a PC server, two PDA clients and a laptop client. We modeled a train on the Incheon Subway Line #1 and a train on the Seoul-to-Incheon Line on the server, simulated the virtual trains together with the real clients. and verified that all the services were successfully provided.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.659-662
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• 2005

Recently, the need for LBS (Location Based Services) is increasing with the rapid growth of the location measurement units, mobile devices, and communication technologies. Especially, wireless carriers are concentrating on LBS since it is regarded as so-called 'killer application' among wireless data services. Although LBS give us convenience and useful information, its use also raises privacy issues. There are quite possibilities that the people's locations are tracked by location measurement units while people do not recognize the existence of the units. To protect a person's location information, lawful and technical aspects should be considered. In this paper, we explain issues, regulations, standards, and platforms related to the protection of the location information. Finally, we suggest the architecture of a platform complying with the regulations and standards. It considers various issues not covered in other studies.