• TTA Journal
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• s.80
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• pp.105-110
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• 2002

• Journal of Korea Multimedia Society
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• v.9 no.9
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• pp.1222-1230
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• 2006

Location-Based Service (LBS) is a service provided to the user based on the user's current geographic location. Since LBS provides a higher value-added service, LBS has been applied on various businesses, industries and even on personal lives. Positioning users is the essential technology in building an LBS system. Thanks to GPS (Global Positioning System), Positioning outdoor is successfully used in practice. However, there is not a general solution for indoor positioning yet, even though many strategies for indoor positioning have been introduced. One of the reasons for the lack of successful indoor positioning is that most of the existing indoor positioning strategies require special equipments dedicated for positioning. This paper introduces an indoor positioning strategy that does not require any additional equipments. Integrating our indoor positioning strategy with GPS-based outdoor positioning, we have implemented an indoor-outdoor positioning system. Experimental results of the system is also introduced.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.580-581
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• 2021

There are various Location-Based Services(LBS) that apply GPS technology in mobile devices such as smart-phone and tablet. In this paper, we designed non-face-to-face oriented LBS software in the reality that non-face-to-face services are increasing due to COVID-19. The proposed model searches location information for trading goods or services and utilizes information identified in real time. The proposed scheduling and priority control algorithm provides efficient service allocations and simulation was performed based on web/app to verify this. While commercialized LBS platforms focus on used goods transactions, the designed method is different in that it provides non-face-to-face services and not-direct transactions between individuals. It provides a wide range of transactions and services to users such as small business owners and franchises.

• Journal of Information Technology Applications and Management
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• v.12 no.1
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• pp.157-172
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• 2005

Recently, location-based service (LBS) is a hot issue in the field of computer applications. So many papers introducing new techniques of implementing a LBS and new application fields of LBS have been published recently. However, to the best of our knowledge, none of them discusses feasibility test in the prior to the implementation. The importance of a feasibility test for a design prior to the implementation cannot be overemphasized. This paper presents a method of feasibility test for a LBS design. Our method performs three steps. At the first step, we build a Petri net model of the LBS system which is depicted in natural language. The second step is to analyse the Petri net to find errors and flaws in the design. We also improve the Petri net model by fixing the errors and flaws in this step. A feasibility test is the third and final step. In this step. we verify if the design satisfies the user's requirement in the senses of quality of service (QoS) and of minimizing the implementation cost. The third step is performed in the manner of mathematical analysis of the Petri net.

• Information and Communications Magazine
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• v.28 no.11
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• pp.3-8
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• 2011

본 논문에서는 스마트 폰 시대를 맞이하여 급성장하고 있는 LBS 기술에 대해 고찰하였다. 특히 이동통신에서 주로 이용하는 위치측위 기술표준화 현황과 GPS 핵심부품을 분석하였으며 측위 정확도를 개선할 수 있는 대안도 제시하였다.

• Journal of the Korea Society of Computer and Information
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• v.27 no.12
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• pp.161-169
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• 2022

With the development of mobile devices and global positioning systems, various location-based services can be utilized, which collects user's location information and provides services based on it. In this process, there is a risk of personal sensitive information being exposed to the outside, and thus Geo-indistinguishability (Geo-Ind), which protect location privacy of LBS users by perturbing their true location, is widely used. However, owing to the data perturbation mechanism of Geo-Ind, it is hard to accurately obtain the density distribution of LBS users from the collection of perturbed location data. Thus, in this paper, we aim to develop a novel method which enables to effectively compute the user density distribution from perturbed location dataset collected under Geo-Ind. In particular, the proposed method leverages Expectation-Maximization(EM) algorithm to precisely estimate the density disribution of LBS users from perturbed location dataset. Experimental results on real world datasets show that our proposed method achieves significantly better performance than a baseline approach.

• Information and Communications Magazine
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• v.28 no.7
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• pp.15-24
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• 2011

본 고에는 스마트 폰의 이용활성화 및 WiFi기반 측위기술에 의하여 실내에서의 위치결정이 가능해짐에 따라 전성기를 맞고 있는 위치기반서비스(LBS)에 대한 표준화 동향 및 주요사항에 대한 표준화 방향에 대하여 기술되어 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.336-338
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• 2013

본 논문에서는 도착예정지를 지나치고, 버스노선 안내 시스템과 지하철 노선 안내 시스템이 서로 분리되어 있어 지하철에서 버스로 환승하거나 그 반대의 경우에 시스템 사용에 있어 번거로운 문제점을 개선하기 위해 LBS 기반 도착예정지 알람 서비스 시스템을 설계하였다. 이를 위하여 Open API와 LBS를 분석하고, 도착예정지를 지나치지 않도록 하기 위해 LBS를 이용하여 도착예정지 알람 서비스 시스템을 설계하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.665-668
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• 2007

The location based service means the service using the location information and the service used based on the location information comes into the spotlight as the critical information of the future mode townsman ubiquitous-City construction. LBS settles down as the core element of ITS or the telematics as the cutting edge technology appearing according to the power generation of the mobile communication technology and recently gradually broadens a range to the public safety service including the distribution management, the asset management, a children and old and the weak protection means, the disaster preparation rescue service like the E-911 of U.S. In the national, the technical regulations about the ground wave LBS was established at November 2005 for the first time in the country. but it actually operated and problems were deduced. Therefore, in this paper, domestic and foreign LBS usage trend and technical standards case try to be analyzed for the revision of the technical regulations of the ground wave LBS serviced in the national and the national technical standards bill for the revision tries to be prepared based on this.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2006.05a
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• pp.291-305
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• 2006

본 연구는 국내 모바일 컨텐츠 비즈니스에서 향후 킬러 애플리케이션으로 예상되고 있는 위치기반서비스(이하 LBS)의 적용 가능성 분석을 통한 발전 방향에 관한 연구이다. 국내 모바일 컨텐츠 산업은 그 성장성, 국내 타 산업 환경과의 적합성, 향후 다양한 분야로의 응용을 통한 수익 창출의 측면에서 매우 중요한 의미를 가지고 있다. 그러나 지난 수년간 이미 내수 가입자의 시장이 포화되었고 또한 사업방향이 단순히 게임 컨텐츠에 집중됨으로써 발전가능성에 적합하지 않는 취약한 구조적 문제를 갖고 있다. 향후 모바일 컨텐츠 비즈니스가 미래 성장 동력으로 변모하기 위해서는 사용자와 모바일 기기 관점에서 현재 성장을 억제하고 있는 시장의 환경적 요인 분석과 공급주체 측면에서의 연구를 통해 새로운 발전 모델을 구축하는 것이 시급하다. 따라서 본 연구는 국내 모바일 컨텐츠 비즈니스가 가진 현재의 한계점을 주목하여 그 한계를 뛰어넘기 위한 방법으로 LBS를 제안하고자 한다. 우선 본 연구제안의 근거로서 기존 모바일 관련 연구들을 바탕으로 1차 검증을 거친 후, LBS 컨텐츠와 관련한 연구 모델을 설정하고 설문조사를 수행하여 실증적으로 분석하였다. 본 연구에서 얻어진 데이터 분석을 통해 향후 비즈니스 모델의 핵심인 기능 컨버젼스 휴대폰과 LBS 활용 서비스를 중심으로 한 컨텐츠 컨버젼스를 효과적으로 융합한 모바일 컨텐츠 비즈니스의 향후 성장가능성에 대해 제시하였다.