• 제목/요약/키워드: Mobile Transactions

검색결과 1,614건 처리시간 0.033초

이동 에이전트 기반 저자사걸 시스템에서의 안전한 이동 에이전트 전송 프로토콜 (A Secure Mobile Agent Transfer Protocol in Mobile Agents Based E-Commerce System)

  • 한승완;임형석
    • 한국정보처리학회논문지
    • /
    • 제7권5S호
    • /
    • pp.1657-1665
    • /
    • 2000
  • Mobile agents based e-commerce system has many advantage than traditional e-commerce-information gathering on goods, price settlement and payment, delivery of the goods purchased, and so on. However, due to the security vulnerability that stems from mobile agent's mobility, mobile agents based e-commerce system has additional security problems. Therefore, in order to do e-commerce securely in th system, first of al the security issues on mobile agents must be addressed. It this paper, we propose a mobile agent transfer protocol that provides confidentiality and integrity of mobile agent in transit and mutual authentication for communicating hosts. We further show the security of the protocol against many possible attacks. Also, we suggest the location management mechanism of mobile agents based on the trust center. This mechanism is capable of finding their locations transparently and detecting mobile agent clones.

  • PDF

이동물체 추적을 위한 이동로봇의 대형제어 (Formation Control of Mobile Robot for Moving Object Tracking)

  • 오영석;이충호;박종훈;김진환;허욱열
    • 전기학회논문지
    • /
    • 제60권4호
    • /
    • pp.856-861
    • /
    • 2011
  • The mobile robot controller is designed to track the target and to maintain the formation at the same time. Formation control is included in mobile robot controller by extending the trajectory tracking algorithm. The dynamic model of mobile robot is used with kinematic model considering the practical physical parameters of mobile robot. The dynamic model of mobile robot transforms velocity control input of kinematic model into torque control input which is the practical control input of mobile robot. Formation controller of mobile robot is designed to satisfy Lyapunov stability by backstepping method. The designed formation controller is applied to the mobile robot for various target movements and simulated to confirm the Lyapunov stability.

모바일 에드혹 네트워크의 OLSR(Optimized Link State Routing Protocol) 구현에 관한 연구 (The Study on the OLSR(Optimized Link State Routing Protocol) Implementation in the Mobile Ad-hoc Network)

  • 조태경;이재희
    • 전기학회논문지P
    • /
    • 제60권4호
    • /
    • pp.257-261
    • /
    • 2011
  • In this paper, we research the OLSR(Optimized Link State Routing Protocol) of the mobile ad-hoc network protocols, and design the system implementation based on the Embedded Linux for the Ubiquitous Space construction. We prove the performance of proposed system in the various experiment environments through several scenarios which is about transmitting the image data on the mobile ad-hoc network environment.

곡률 주행 기법을 이용한 무인 이동 개체의 장애물 회피 알고리즘 (Obstacle Avoidance of Autonomous Mobile Agent using Circular Navigation Method)

  • 이진섭;좌동경;홍석교
    • 전기학회논문지
    • /
    • 제58권4호
    • /
    • pp.824-831
    • /
    • 2009
  • This paper proposes an obstacle avoidance algorithm for an autonomous mobile robot. The proposed method based on the circular navigation with probability distribution finds local-paths to avoid collisions. Futhermore, it makes mobile robots to achieve obstacle avoidance and optimal path planning due to the accurate decision of the final goal. Simulation results are included to show the feasibility of the proposed method.

A Posture Control for Two Wheeled Mobile Robots

  • Shim, Hyun-Sik;Sung, Yoon-Gyeoung
    • Transactions on Control, Automation and Systems Engineering
    • /
    • 제2권3호
    • /
    • pp.201-206
    • /
    • 2000
  • In this paper, a posture control for nonholonomic mobile robots is proposed with an empirical basis. In order to obtain fast and consecutive motions in realistic applications, the motion requirements of a mobile robot are defined. Under the assumption of a velocity controller designed with the selection guidance of control parameters, the algorithm of posture control is presented and experimentally demonstrated for practicality and effectiveness.

  • PDF

사각장치에 의해 감지된 가이드 마크를 이용한 이동 로보트의 효과적인 항법 (Effective Navigation of a Mobile Robot Using Guide-Marks Sensed through Vision)

  • 조동권;권호열;서일홍
    • 대한전기학회논문지
    • /
    • 제38권12호
    • /
    • pp.963-970
    • /
    • 1989
  • The navigation problem for a mobile robot is investigated. Specifically, it is proposed that simple guide-marks be introduced and the navigation scheme be generated in conjunction with the guide-marks sensed through camera vision. For autonomous navigation, it was shown that a triple guide-mark system is more effective than a single guide-mark in estimating the position and orientation of mobile robot itself. The navigation system is tested via a mobile robot HERO-I equipped with a single camera in laboratory environment.

  • PDF

모바일 상품권 거래 중개 시스템의 필요성에 관한 연구 (A Study on Necessity of System for mediating transactions of a mobile gift certificate)

  • 배유미;정성재;이광용;장래영;이재웅
    • 한국정보통신학회:학술대회논문집
    • /
    • 한국정보통신학회 2016년도 춘계학술대회
    • /
    • pp.185-188
    • /
    • 2016
  • 상품권 시장에서 모바일 상품권이 차지하는 비중은 해마다 큰 폭으로 증가하고 있다. 그러나 소비자 입장에서 보면 모바일 상품권은 여러 가지 문제점을 가지고 있다. 공정거래위원회에서 불공정약관을 지정하면서 조금씩 개선되고 있으나 상품권을 발행한 기관에 등가로 교환되지 않는 문제점은 해결할 수가 없다. 이 문제점을 해결하기 위한 가장 현실적인 방법을 사용자끼리 교환이 가능한 환경을 조성하는 것이다. 결론적으로 편리하고 신뢰할 수 있는 안전한 거래가 보장되는 P2P(Peer to Peer) 기반의 모바일 상품권 거래 중개소가 구축된다면 모바일 상품권 시장의 확대, 사회적 비용 감소 등 건전한 유통 환경 조성에 기여할 수 있을 것으로 사료된다.

  • PDF

A Data Gathering Approach for Wireless Sensor Network with Quadrotor-based Mobile Sink Node

  • Chen, Jianxin;Chen, Yuanyuan;Zhou, Liang;Du, Yuelin
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • 제6권10호
    • /
    • pp.2529-2547
    • /
    • 2012
  • In this paper, we use a quadrotor-based mobile sink to gather sensor data from the terrestrial deployed wireless sensor network. By analyzing the flight features of the mobile sink node, we theoretically study the flight constraints of height, velocity, and trajectory of the mobile sink node so as to communicate with the terrestrial wireless sensor network. Moreover, we analyze the data amount which the mobile sink can send when it satisfies these flight constraints. Based on these analysis results, we propose a data acquisition approach for the mobile sink node, which is discussed detailed in terms of network performance such as the transmission delay, packet loss rate, sojourning time and mobile trajectory when given the flying speed and height of the mobile sink node. Extensive simulation results validate the efficiency of the proposed scheme.

이동 컴퓨팅 서비스를 위한 부분 연결 관리자의 설계 및 프로토타입핑 (Design and Prototyping of Partial Connection Manager for Mobile Computing Service)

  • 김평중;윤석환;진성일
    • 한국정보처리학회논문지
    • /
    • 제7권6호
    • /
    • pp.1932-1940
    • /
    • 2000
  • We must solve problems caused by mobile computing environments for supporting efficient mobile computing services. The problem is the use of wireless medium having high error rates and low bandwidth, and the sudden network disconnection to reduce the power consumption of a mobile host and the cost of the network connection. For these problems, we proposed the architecture of the partial connection manager and designed and implemented that in this paper. In particular, The partial connection manager creates the limited number of mobile agents according to priority and sends them in parallel to server systems and combines results of them process rapidly the user request. By applying the proposed partial connection manager to the mobile computing services called cybermarket, we knew that the mobile agent technique could be suited to the mobile computing environment and overcome the partial connection problem caused by eh mobile computing environment.

  • PDF

An Automatic and Scalable Application Crawler for Large-Scale Mobile Internet Content Retrieval

  • Huang, Mingyi;Lyu, Yongqiang;Yin, Hao
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • 제12권10호
    • /
    • pp.4856-4872
    • /
    • 2018
  • The mobile internet has grown ubiquitous across the globe with the widespread use of smart devices. However, the designs of modern mobile operating systems and their applications limit content retrieval with mobile applications. The mobile internet is not as accessible as the traditional web, having more man-made restrictions and lacking a unified approach for crawling and content retrieval. In this study, we propose an automatic and scalable mobile application content crawler, which can recognize the interaction paths of mobile applications, representing them as interaction graphs and automatically collecting content according to the graphs in a parallel manner. The crawler was verified by retrieving content from 50 non-game applications from the Google Play Store using the Android platform. The experiment showed the efficiency and scalability potential of our crawler for large-scale mobile internet content retrieval.