• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.10
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• pp.1994-2000
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• 2016

Technology that can determine the location of individuals is required in a variety of applications such as location based control, a personalized advertising. Missing-child prevention and support for field trips, and applications such as push events based on the user's location is endless. In particular, the technology that can determine the location without interruption in the indoor and outdoor spaces have been studied a lot recently. Because emphasizing on accuracy of the positioning, many conventional research have constraints such as using of additional sensing devices or special mounting devices. The algorithm proposed in this paper has the purpose of performing the positioning only with standard equipment of the smart phone that has the most users. In this paper, sensor Fusion with GPS, WiFi Radio Map, Accelerometer sensor and Particle Filter algorithm is designed and implemented. Experimental results of this algorithm shows superior performance than the other compared algorithm. This could confirm the possibility of using proposed algorithm on actual environment.

• Journal of the Korean Institute of Intelligent Systems
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• v.14 no.7
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• pp.865-870
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• 2004

Development of new information and traffic technology causes fast-growing in the field of information-based system. At recent, development of LBS(Location Based Service) makes a remarkable growth of industry as GPS(Global Positioning System) becomes wide-spread and location information becomes more important. However, there is a problem like infringement of privacy when location information is used improperly［1］. In this paper, LBS platform is proposed in order to prevent infringement of privacy. To implement, we classify user path as pattern in a zone of user life. Thereupon, location information is provided according to user' specific situation.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.528-530
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• 2012

본 논문에서는 개인의 감성정보를 분석하여 음식을 추천해주는 어플리케이션을 설계한다. 제안하는 방법은 현재 위치로부터의 거리나 인터넷 블로그 등에 소개되었던 맛집과 같은 정보를 이용하여 음식을 추천하는 방식과 다르게, 음식 선택에 있어 개인의 기분, 체중, 현재의 날씨와 위치 같은 개인적 정보와 함께 음식에 관한 선호도 조사와 요인분석을 통해 만들어진 감성지도를 바탕으로 여러 상황에 맞는 음식을 추천한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.7
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• pp.786-792
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• 2019

Currently, various kinds of contents using smart phone's location information are developed and provided to users. The market size of the location-based service industry utilizing location information is also increasing every year and the majority of smart phone users occupy university students and most of the university students are using their owns smart phones, and they are the biggest users of location-based services and the main target of location information collection. In this paper, we conduct to a survey how university students understand about location information. Based on the results of the survey, we will deeply examine which one is needed to improve understanding of university students' location information collection and usage and what should be considered for the development of the location-based service industry and education of location information and then we propose some helpful suggestion.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10b
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• pp.71-76
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• 2006

핸드폰, 스마트폰, PDA와 같은 모바일 디바이스는 위치, 전화기록, SMS, 사진, 동영상 등 사용자에 관한 다양한 정보를 지속적으로 수집하는데 유용하다. 최근, 모바일 디바이스로부터 수집된 정보를 토대로 개인의 일상을 요약하거나 상위 수준의 행동을 추론하는 등의 서비스를 제공하려는 연구가 진행되고 있다. 본 논문에서는 모바일 디바이스에서 수집된 정보를 검색, 요약, 시각화하기 위한 플랫폼인 라이프 브라우저를 제안한다. 라이프 브라우저는 디바이스에 저장된 개인 정보를 효과적으로 검색할 수 있도록 해주고, 개념 네트워크를 활용하여 개념 검색을 지원하며, 키그래프 기반 정보 요약 기능을 제공한다. 위치 정보의 레이블링을 위해 블록 기반의 Location Positioning Server가 구축되었다. 실제 3명의 사용자를 대상으로 수집한 정보를 라이프 브라우저를 통해 회상해 보는 과정을 분석해 보았고 저수준의 로그 정보를 직접 다루는 것보다 개념 네트워크 기반 라이프 브라우저를 사용하는 것이 유용함을 확인할 수 있었다.

• Proceedings of the Korea Contents Association Conference
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• 2010.05a
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• pp.19-21
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• 2010

모바일 산업이 발달하면서 사람들은 개인간의 보다 섬세한 정보교환과 이로 인한 끈끈한 유대관계를 추구하게 되었다. 이러한 요구에 소셜 네트워킹 서비스 들이 단문 메시지 중심으로 활성화 되어 왔고, 스마트폰과 결합하면서 위치 정보를 추가하고자 하는 요구와 필요성이 문제시되고 있다. 그러나, 이러한 위치 정보는 민감한 정보이기 때문에 보안 및 프라이버시 문제가 대두되고 있다. 가족 구성원의 위치 정보를 공용 서버에 저장하는 것은 서비스 사용 활성화를 저해하는 요인이 될 수 있기 때문에, 본 논문에서는 가정내 홈 서버에서 사용할 수 있는 가정용 위치 정보 기반의 SNS 서비스를 제안하며, 사회의 가장 작은 구성 단위인 가정에서 가족 구성원들간의 친목과 유대관계를 증진시킬 수 있는 보다 공익적인 서비스를 제안하고자 한다.

• Journal of Korea Spatial Information System Society
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• v.7 no.3 s.15
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• pp.13-24
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• 2005

This paper proposes a model for the location information grading policy. Location information grading policy is that government would give a public notice of criterion for location information quality, and location information operators should elucidate the grade of provided location information. As the quality grade of services is provided in the 'terms of use' with the detailed quality specification and quality range, the user can understand the quality of location information, and can select more suitable service for their purposes. Additionally, the qualiy grading policy can enforce the location information operators and location service providers to support more stable and reliable service quality. In this paper, we propose the model of location information grades, the typical classification of quality, and the realitic policy applying model. Recent enacted 'Location Information Law' are expected to activate korean information market. In this situation, proposed location information grading policy take a role in protecting location privacy and improving the reliability of location information services.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.3
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• pp.702-709
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• 2008

In this paper, Developed u-Marketing system prototype based on location base service could offer because this treatise combines personalized and mobility. It is u-Marketing system takes advantage of u-LBS base skill to support marketing that is old Mobile more efficiently u-marketing call center. If it was marketing in spam way that marketing to be Mobile passes public information contents one-sidely to unspecificness many customers so far, u-Marketing system takes advantage of u-LBS base skill-marketing system is u-marketing system of location base that can take advantage of subscriber's location information through portable phone or GPS with transfer telegraph operator adulterating member's distinction of sex, age, residential district, profession and support satisfied article ordered style Target marketing.

• The KIPS Transactions:PartA
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• v.10A no.4
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• pp.381-388
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• 2003

Location tracking is used to keep track of the location information of a mobile terminal in an idle state for a cail setup between mobile terminals. In this paper, we introduce a location update algorithm based on the call arrival history, which is appropriate for a variable call arrival rate over time. The location tracking strategy which uses the proposed algorithm can find changes in the call arrival rate by maintaining a call arrival history of a mobile terminal, from which a mobile terminal can calculate an appropriate timeout interval for a variable call arrival rate. We show that the proposed scheme is appropriate for a variable call arrival rate by presenting a simple analytical model and analytical results to investigate its performance for both a fixed and a variable call arrival rate.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.84-89
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• 2009

Personal mobile devices such as mobile phone, PMP and MP3 player have advanced incredibly. Such advance in mobile technology ignites the research related to the life-log to understand the daily life of an user. Since life-log collected by mobile sensors can aid memory of the user, many researches have been conducted. This paper suggests a methodology for user-context recognition and visualization based on the outdoor location by GPS as well as indoor location by wireless-lan. When the GPS sensor does not work well in an indoor location, wireless-lan plays a major role in recognizing the location of an user so that the recognition of user-context become more accurate. In this paper, we have also developed the method for visualization of the life-log based on map and blog interfaces. In the experiments, subjects have collected real data with mobile devices and we have evaluated the performance of the proposed visualization and context recognition method based on the data.