• Title/Summary/Keyword: 모바일 검색

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A Node-disjoint Multipath Discovery Method by Local Route Discovery based on AODV (AODV기반의 지역경로탐색을 이용한 노드 비중첩 다중 경로 검색 기법)

  • Jin, Dong-Xue;Kim, Young-Rag;Kim, Chong-Gun
    • The KIPS Transactions:PartC
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    • v.14C no.1 s.111
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    • pp.87-94
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    • 2007
  • In mobile ad hoc networks the most popular on demand routing protocols are the Dynamic Source Routing (DSR) protocol and the Ad hoc On demand Distance Vector (AODV) routing protocol. These and other representative standard routing protocols are designed to find and maintain only a single path. Whenever there is a link break on the active route, source node has to invoke a route discovery process from the beginning and it causes a lot of overhead. Multipath routing protocols, which can alleviate these problems by establishing multiple alternative paths between a source and a destination, are widely studied. In this paper we propose a node disjoint multipath discovery technique based on AODV local route discovery. This technique can find and build completely separated node disjoint multi paths from a source to a destination as many as possible. It will make routing more robust and stable.

A Study on Network Hierarchy Model which uses a Dynamic Segmentation Technique (동적 분할 기법을 이용한 네트워크 계층 모델에 관한 연구)

  • Joo, Yong-Jin;Lee, Yong-Ik;Moon, Kyung-Ky;Park, Soo-Hong
    • Spatial Information Research
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    • v.14 no.2 s.37
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    • pp.245-260
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    • 2006
  • A practical use of the location information and user requirement are increased in a mobile environment which supports the portability. And Various service which GIS is related with a Spatial DB have been processed. Generally, logical relation of a traffic network which organizes the Road DB uses a basic node-link structure. In this way, Designed structure can not be flexible at various model apply and are not efficient with a database retrieval in a maintenance management side. In this research, We supplement with the problem of a existing network model and the limitation of the building through the design of a network model which uses dynamic segmentation. And we tried to implement efficient hierarchy model at the retrieval of the network and presentation. Designed model supports a stage presentation of various level and a hierarchy entity relation and We are expected to supplement a network spatial modelling function which the GIS has.

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Research on Efficient Live Evidence Analysis System Based on User Activity Using Android Logging System (안드로이드 로그 시스템을 이용한 효율적인 사용자 행위기반 라이브 증거수집 및 분석 시스템 연구)

  • Hong, Il-Young;Lee, Sang-Jin
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.22 no.1
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    • pp.67-80
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    • 2012
  • Recently as the number of smartphone user is growing rapidly, android is also getting more interest in digital forensic. However, there is not enough research on digital data acquisition and analysis based on android platform's unique characteristics so far. Android system stores all the related recent systemwide logs from the system components to applications in volatile memory, and therefore, the logs can potentially serve as important evidences. In this paper, we propose a digital data acquisition and analysis system for android which extracts meaningful information based on the correlation of android logs and user activities from a device at runtime. We also present an efficient search scheme to facilitate realtime analysis on site. Finally, we demonstrate how the proposed system can be used to reconstruct the sequence of user activities in a more intuitive manner, and show that the proposed search scheme can reduce overall search and analysis time approximately 10 times shorter than the normal regular search method.

An Optimal Path Search Method based on Traffic Information for Telematics Terminals (텔레매틱스 단말기를 위한 교통 정보를 활용한 최적 경로 탐색 기법)

  • Kim, Jin-Deog
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.12
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    • pp.2221-2229
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    • 2006
  • Optimal path search algorithm which is a killer application of mobile device to utilize location information should consider traffic flows of the roads as well as the distance between a departure and destination. The existing path search algorithms, however, are net able to cope efficiently with the change of the traffic flows. In this paper, we propose a new optimal path search algorithm. The algorithm takes the current flows into consideration in order to reduce the cost to get destination. It decomposes the road network into Fixed Grid to get variable heuristics. We also carry out the experiments with Dijkstra and Ar algorithm in terms of the execution time, the number of node accesses and the accuracy of path. The results obtained from the experimental tests show the proposed algorithm outperforms the others. The algorithm is highly expected to be useful in a advanced telematics systems.

Learning Predictive Models of Memory Landmarks based on Attributed Bayesian Networks Using Mobile Context Log (모바일 컨텍스트 로그를 사용한 속성별 베이지안 네트워크 기반의 랜드마크 예측 모델 학습)

  • Lee, Byung-Gil;Lim, Sung-Soo;Cho, Sung-Bae
    • Korean Journal of Cognitive Science
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    • v.20 no.4
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    • pp.535-554
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    • 2009
  • Information collected on mobile devices might be utilized to support user's memory, but it is difficult to effectively retrieve them because of the enormous amount of information. In order to organize information as an episodic approach that mimics human memory for the effective search, it is required to detect important event like landmarks. For providing new services with users, in this paper, we propose the prediction model to find landmarks automatically from various context log information based on attributed Bayesian networks. The data are divided into daily and weekly ones, and are categorized into attributes according to the source, to learn the Bayesian networks for the improvement of landmark prediction. The experiments on the Nokia log data showed that the Bayesian method outperforms SVMs, and the proposed attributed Bayesian networks are superior to the Bayesian networks modelled daily and weekly.

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Integrated Parking Control System based on RFID (RFID를 이용한 통합 주차 관제 시스템)

  • Lee, Hyoun-Sup;Kim, Jin-Deog
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2007.06a
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    • pp.331-335
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    • 2007
  • Among the various application to use FRID, the parking control system widely uses it recently. However, it is rare for the existing systems to integrate several parking lot in the clustered shopping center. This paper proposes the integrated parking control system based on RFID. The system searches optimal path to parking lot with due regard to the position of users who own a tag and the status of parking lots. Then, it transmits the path to mobile devices of the users. The system consists of main server, middle ware to filter and manage tag information, parking lot client to send and manage the status of each parking lot and application module of mobile devices based on WIPI for displaying the optimal path. The main server integrates these components by a database and a new method to filters and manage tag information is newly proposed for the sake of maintaining the position and the direction of the cars in the middle ware. The implemented system shows that it is highly expected to be useful in an advanced integrated parking control system.

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Design and Implementation of Mind map program using Open API (오픈 API를 이용한 마인드맵 프로그램의 설계 및 구현)

  • Lee, Seon-Ung;Lee, Hye-Rim;Kim, Yoo-Doo;Moon, Il-Young
    • Journal of Advanced Navigation Technology
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    • v.13 no.1
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    • pp.134-141
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    • 2009
  • In this paper, it is proposed a mind map program using open API to provide mashup function. Web paradigm is changing to Web 2.0. So mashup using open API is much applied. Mashup is good method for not only web service, but making new ideas or informations. It is mind map that was made systematical like this method. In this paper, a mind map application based on mobile that provides mashup function implemented for modern people that mostly process their business during movement.

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Object Information Service System Design and Development to Component in Mobile RFID Environment (모바일 RFID 환경에서 컴포넌트화를 통한 효율적인 객체정보서비스 시스템 설계 및 구현)

  • Chois, sung-min;Koh, hyung-dae;Choi, han-suk
    • Proceedings of the Korea Contents Association Conference
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    • 2009.05a
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    • pp.497-501
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    • 2009
  • The object information service of mobile RFID base leads integrated management of object information and the search of information and management service is provided. Respects an object information service and to make an object information server and an object directory server compose becomes. And to object information server constructs the DB server which will store information and DB leads and object information manages. Like this object information service is applied in the field which RFID bases is various and becomes. Therefore the administration tool for the object information service will be able to apply easily in the field which is various is necessary. So this paper e in object information management which the components out the functions which are necessary to the respectively field of RFID environments to do from the research which sees and apply. That according to the research result which see the object information service see is a possibility of becoming accomplished easily efficiently from RFID environments which are various comes to seem.

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Design and Implementation of e-Logistics System supporting Efficient Moving Objects Trajectory Management (효율적인 차량 궤적 관리를 지원하는 물류관리시스템의 설계 및 구현)

  • Lee, Eung-Jae;Nam, Kwang-Woo;Ryu, Keun-Ho
    • Journal of the Korean Association of Geographic Information Studies
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    • v.9 no.2
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    • pp.30-41
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    • 2006
  • This paper proposes an e-logistics system supporting efficient vehicle moving trajectory management. Recent advances in wireless communications have given rise to a number of location-based services including logistics vehicle tracking, cellular phone user's location finding, and location-based commerce. Logistics systems typically entail tracking vehicles for purposes of the logistics center knowing the whereabouts of the vehicles and/or consignments. Moreover, storing and managing location trajectory of continuously moving vehicles and consignments is necessary for supporting efficient logistics plan and consignment. The proposed system is able to manage spatial objects in GIS as well as logistic information in the mobile environment. And for the efficiently managing and retrieving of transporting trajectory of logistics, we extend previous moving object indexing method, TB-Tree, to use multi-version framework and evaluate data updating performance. It is able to apply the proposed method to develop mobile contents services based on continuously changing location of moving object in the mobile environment.

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Preference Element Changeable Recommender System based on Extended Collaborative Filtering (확장된 협업 필터링을 활용한 선호 요소 가변 추천 시스템)

  • Oh, Jung-Min;Moon, Nam-Mee
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.47 no.4
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    • pp.18-24
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    • 2010
  • Mobile devices wide spread among users after the release of Apple's iPhone, especially in Korea. Mobile device has their own advantages in terms of weight, size, mobility and so on. But, on the contrary, mobile device has to provide more accurate and personalized information because of a small screen and a limited function of information retrieval. This paper presents a user"s preference element changeable recommender system by employing extended collaborative filtering as a technique to provide useful information in a mobile environment. Proposed system reflects user's similar groups by simultaneously considering users' information with preferences and demographic characteristics. Then we construct list of recommenders by user's choice. Finally, we show the implementation of a prototype based on iPhone.