• Journal of Communications and Networks
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• 제15권2호
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• pp.179-190
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• 2013

Given the bandwidth assignment for dedicated short range communications for use in vehicular ad-hoc network (VANET) and the expected introduction of equipment in the next few years, we elaborate on how VANET can support infotainment services. We define an architectural model for the integration of VANETs and cellular networks, according to a push mode paradigm where VANETs are used primarily to disseminate service announcements and general interest messages. Cooperation with cellular network is addressed by comparing architecture alternatives. A set of information dissemination protocols for VANETs is compared via simulations on a real urban map. Some results from a lab testbed based on IEEE 802.11p boards are presented along with an application developed for Android operating system to demonstrate the concept of the paper.

• Human Ecology Research
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• 제51권5호
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• pp.483-495
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• 2013

This study aimed to identify the dimensions of benefits and costs that consumers perceive in utilizing locationbased applications (LBAs) on smartphones, and to distinguish consumer groups according to their perceptions of those benefits and costs. A web-based consumer survey was conducted-among consumers who had experience using LBAs. Four hundred participants were 20's to 40's, with 200 women and 200 men. Descriptive statistics, frequency analysis, t -tests, one-way analysis of variance, and cluster analysis were used for data analysis. The findings of this study are as follows: first, LBAs accounted for about 20% of the smartphone apps used by consumers. Second, factor analysis identified the underlying dimensions of the benefits and costs of smartphone LBAs. The underlying dimensions of benefits perceived by consumers were information/economic/convenience, entertainment and personalization. Privacy concerns, lack of trust and lack of behavioral control were the underlying dimensions of the perceived costs of LBAs. Third, ANOVA showed that the perceived benefits and costs of smartphone LBA services differed according to the characteristics of the consumer. Cluster analysis identified three distinctive consumer groups according to the levels of perceive costs and benefits of smartphone LBAs. The three groups were labeled the 'benefit-cost balanced group,' 'cost centered group,' and 'benefit centered group.'

• 정보과학회 논문지
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• 제42권2호
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• pp.272-279
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• 2015

현재 스마트 디바이스의 활용도가 높아짐에 따라 사용자의 요구는 점점 복잡하게 되어가고 있다. 대부분의 IT 전문가들은 이러한 요구사항을 만족시키기 위해서 추가적인 기능들이 추가되어야 할 것으로 주장한다. 모바일 서비스 형태의 대부분이 위치 기반 서비스(LBS: Location-based Service)를 고려하기 때문에 이는 특히 중요한 연구로서 집중되고 있다. 일반적으로 Wi-Fi 기술은 위치 즉, 네트워크 존(Network Zone)이 변경됨에 따라 새로운 연결을 요구하기 때문에 위치 파악이 제한적일 수밖에 없다. 또한, GPS는 부정확한 실내 데이터를 가지기 때문에 실내 환경에서 LBS 서비스를 제공하는 것은 여전한 시스템적인 문제가 있다. 따라서 이러한 한계를 극복하기 위해 iBeacon 기술이 설계되고 Wi-Fi 혹은 GPS 대신에 LBS 서비스를 위해 사용되고 있다. Bluetooth 4.0 LE 기술 기반 iBeacon을 사용하여 우리는 현재의 사용자 위치와 지하철 도착 시간을 활용할 수 있는 다양한 mLBS(micro LBS) 서비스를 정확하고 알맞게 제공하기 위한 M-SAS(Mobile-Subway Alarm Service System)을 제안한다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.843-845
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• 2003

Shortest Path Problems are among the most studied network flow optimization problems, with interesting applications in various fields. One such field is the route determination service, where various kinds of shortest path problems need to be solved in location-based service. Our research aim is to propose a route technique in real-time locationbased service (LBS) environments according to user’s route preferences such as shortest, fastest, easiest and so on. Turn costs modeling and computation are important procedures in route planning. There are major two kinds of cost parameters in route planning. One is static cost parameter which can be pre-computed such as distance and number of traffic-lane. The other is dynamic cost parameter which can be computed in run-time such as number of turns and risk of congestion. In this paper, we propose a new cost modeling method for turn costs which are traditionally attached to edges in a graph. Our proposed route determination technique also has an advantage that can provide service interoperability by implementing XML web service for the OpenLS route determination service specification. In addition to, describing the details of our shortest path algorithms, we present a location-based service system by using proposed routing algorithms.