• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.309-312
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• 2005

The need for LBS (Loc,ation Based Services) is increasing due to the wnespread of mobile computing devices and positioning technologies~ In LBS, there are many applications that need to manage moving objects (e.g. taxies, persons). The moving object join operation is to make pairs with spatio-temporal attribute for two sets in the moving object database system. It is import and complicated operation. And processing time increases by geometric progression with numbers of moving objects. Therefore efficient methods of spatio-temporal join is essential to moving object database system. In this paper, we apply spatial join methods to moving objects join. We propose two kind of join methods with TB- Tree that preserves trajectories of moving objects. One is depth first traversal spatio-temporaljoin and another is breadth-first traversal spatio-temporal join. We show results of performance test with sample data sets which are created by moving object ,generator tool.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.256-259
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• 2004

Recently, Location-based services(LBS) allow consumers to receive services based on their geographic location data. Users want to take services based location information with portable devices. And Point of Interest(POI) information's usage is increasing with mobile device's development and user's interest. And this paper shows that we connect the multimedia POI database(DB), provide the multimedia services through the portable devices and search POI using location and direction information. The multimedia POI is consisted of sound, image, moving image and animation with location information. When we search POI, we find POI in DB using the area zone and direction information.[l]

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2005년도 춘계학술발표대회
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• pp.373-376
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• 2005

유비퀴토스 환경에서 차세대 LBS(Location-Based Service) 서비스를 위한 콘텐츠를 제공하기 위해 각 단말기와 환경 및 사용자의 취향에 맞게 콘텐츠를 리퍼포징(Repurposing)해야 한다. 콘텐츠 리퍼포징이란 유비퀴토스 환경 구축에 필수적인 핵심 기술로서, 하나의 원본 콘텐츠를 사용자의 선호도, 단말기 특성, 네트워크 특성 등에 따라 최적의 상태로 적응/변환하여 제공함을 말한다. 본 논문에서는 다양한 사용자에게 차세대 LBS 서비스를 위해 콘텐츠의 사용자 정보와 콘텐츠 관련 환경 정보 등을 분석, 전달하기 위한 방법론을 제안하고, 또한 리퍼포징된 콘텐츠의 다양한 정보 분석 방법을 제공하기 위한 미들웨어 아키텍처를 설계한다. 이는 학문적으로 새로운 최첨단의 이론과 기술을 창출하고 이를 기반으로 차세대 LBS 서비스 분야에 혁신적인 역할을 할 것으로 기대된다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.555-557
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• 2003

Location-based services allow consumers to receive services based on their geographic location data. For example, businesses can provide information to find traffic facility, public restaurant, a hospital, and a station based on the consumer’s location at a particular moment. Also, they wish to grasp a accurate location based service in mobile device or PDA. So, this paper shows that presentation service offers a base-map to be overlaid OpenLS (Open Location Services)’s directory service, route determination service, geocode and reverse-geocode service. The presentation service is the portrayal of a map and portrayal of feature as map overlays.

• 한국콘텐츠학회논문지
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• 제16권9호
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• pp.1-11
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• 2016

본 연구의 목적은 위치기반서비스(Location-Based Service: LBS)에서 관계 품질과 L-로열티에 미치는영향에 대해 검증하는 것이다. LBS, 관계 품질, L-로열티에 관한 이론적 배경을 바탕으로 연구모형 및 가설을 설정하였다. 본 연구에서는 위치기반서비스 이용자들을 대상으로 설문지를 배포하였다. 연구결과, 첫째, 개인화, 지각된 가치는 몰입에 정(+)의 영향을 미치는 것으로 나타났고, 지각된 위험은 몰입에 부(-)의 영향을 미치는 것으로 나타났다. 둘째, 개인화, 편재성, 지각된 가치는 만족에 정(+)의 영향을 미치는 것으로 나타났고, 지각된 위험은 만족에 부(-)의 영향을 미치는 것으로 나타났다. 마지막으로, 몰입과 만족은 L-로열티에 정(+)의 영향을 미치는 것으로 나타났다. 본 연구는 위치기반서비스에서 관계 품질과 로열티를 향상시키고 충성도 높은 고객을 확보할 수 있는 다양한 시사점을 제공할 수 있을 것이다.

• Journal of Information Technology Applications and Management
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• 제12권1호
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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.

• Asian-Australasian Journal of Animal Sciences
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• 제12권7호
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• pp.1025-1030
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• 1999

Fifth one Nili-Ravi dairy buffaloes in their last two months of gestation, were selected in NWFP Pakistan. Rectal palpation was carried out fortnightly, until the occurrence of first estrus. Ovulation was confirmed per rectum and milk progesterone levels (MPL). Body condition score (BCS)was recorded weekly. Milk samples were collected weekly for MPL and blood samples fortnightly for metabolites analysis. Milk yield was recorded and samples were collected for milk fat. The buffaloes calving during the normal breeding season (NBS, August to January)had short (p<0.01) postpartum estrus interval of $55.95{\pm}4.90$ days versus $91.15{\pm}11.61 $ days in the buffaloes calving during the low breeding season (LBS, February to July). MPL in the LBS calvers remained lower than NBS calves (p<0.01). The incidence of silent ovulation was higher during LBS as compared to NBS (70.6% versus 29.4%). MPL showed a pattern opposite to atmospheric temperature. In NBS calvers serum glucose levels were higher (p<0.01) and magnesium levels were lower (p<0.01) than LBS calvers. Higher serum urea was found in summer and spring than that autumn and winter (p<0.05). The reproductive performance in buffaloes calving in the LBS coincided with a low BCS (p<0.01). Fat corrected milk production (FCM) was higher in NBS than LBS (p<0.01) calvers.

• 한국위성정보통신학회논문지
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• 제8권2호
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• pp.22-28
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• 2013

In this paper, new LBS (location based service) are proposed using conventional DMB (digital multimedia/mobile broadcasting) system. LBS applications are proposed that can be suitable for the subway and ground transportation based on S-DMB (satellite-DMB) and T-DMB (terrestrial-DMB) respectively. In the shaded area such as subway, the broadcasting signal transmitted from the satellite of S-DMB system should be retransmitted by the earth repeater called the gap filler and each gap filler has its own identification value called the gap filler ID which introduces the area in which the gap filler was installed. Therefore, the LBS can be implemented by using the gap filler ID of S-DMB on the subway in which the GPS (global positioning system) can't be received. Unlike the LBS on the subway, the combination of T-DMB and DGPS (differential GPS) will be introduced as a way for ground transportation. Generally, DGPS has been designed to compensate the position value calculated from the GPS signal so that positioning error of about 1 meter can be obtained by using DGPS information. T-DMB system transmitting DGPS signal will be expected to be commercial in Korea and, if using DGPS information transmitted through T-DMB network, LBS with more precise positioning than GPS alone can be implemented in the ground vehicles.

• Journal of Information Processing Systems
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• 제10권4호
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• pp.618-627
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• 2014

Nowadays mobile users are using a popular service called Location-Based Services (LBS). LBS is very helpful for a mobile user in finding various Point of Interests (POIs) in their vicinity. To get these services, users must provide their personal information, such as user identity or current location, which severely risks the location privacy of the user. Many researchers are developing schemes that enable a user to use these LBS services anonymously, but these approaches have some limitations (i.e., either the privacy prevention mechanism is weak or the cost of the solution is too much). As such, we are presenting a robust scheme for mobile users that allows them to use LBS anonymously. Our scheme involves a client side application that interacts with an untrusted LBS server to find the nearest POI for a service required by a user. The scheme is not only efficient in its approach, but is also very practical with respect to the computations that are done on a client's resource constrained device. With our scheme, not only can a client anonymously use LBS without any use of a trusted third party, but also a server's database is completely secure from the client. We performed experiments by developing and testing an Android-based client side smartphone application to support our argument.

• 한국전자거래학회지
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• 제22권1호
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• pp.89-106
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• 2017

스마트폰과 태블릿 PC 등의 모바일 기기의 확산으로 세계 모바일 애플리케이션(Application, 이하 앱) 시장 규모가 확대되면서, 위치기반서비스(Location-Based Service: LBS)가 새로운 서비스로 주목 받고 있다. 하지만 LBS 앱 관련 제도와 법규가 이루어지지 못한 상태에서 LBS 앱이 빠르게 확산되면서 개인 사생활 침해 가능성 및 개인 정보유출과 같은 프라이버시 염려가 증가하고 있다. 본 연구는 중국과 한국 사용자가 사용하는 맛집 앱을 대상으로 LBS 앱 사용자의 인지된 가치를 살펴보고자 한다. 본 연구의 목적은 맛집 어플리케이션을 사용할 때 개인 정보를 제공함으로써 얻게 되는 인지된 가치와 그에 영향을 주는 변수들을 규명하고자 한다. 본 연구의 분석 결과는 다음과 같다. 소비자가 정보의 유용성을 인지하며 정보에 대한 통제능력이 높을수록 정보에 대한 인지된 가치가 증가하는 것을 증명하였다. 또한 위치기반서비스 앱 활용능력이 프라이버시 이익에 긍정적인 영향을 미치고 정보에 지각된 취약성이 프라이버시 위험에 부정적인 영향을 미치는 것을 증명하였다. 그리고 선행연구와 달리 위치기반서비스에 대한 인지된 가치는 프라이버시 계산에 구성되는 프라이버시 이익과 위험에 긍정적인 영향을 주었다.