• Title/Summary/Keyword: 유비쿼터스 컴퓨팅 기술

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Design and Implementation of Network Self-Configuration Based on Bluetooth (Bluetooth 기반 네트워크 자동형성 설계 및 구현)

  • Kang, Seong-Ho;Choo, Young-Yeol
    • Journal of Korea Multimedia Society
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    • v.11 no.10
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    • pp.1376-1384
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    • 2008
  • Numerous researches on network self-configuration have been conducted on Wireless Sensor Network (WSN) and Ad Hoc network but the results have not been applied yet for factory automation. This paper presents development of intelligent process management systems conducting process monitoring and control irrelevant to physical position of a plant operator. The systems are indispensable for diagnosis of rotating machines which cannot exploit wired network. The system was implemented in a Personal Digital Assistant (PDA) using Bluetooth communication protocol. When a mobile terminal reaches to communication range of the process management server, the server detects the mobile terminal to reconfigure plant network automatically. The server authenticates a user of the terminal to download and installs monitoring and control program considering authorized level of the user. If the terminal leaves communication range of the server, it deletes the node from the network and removes the program automatically to save resources and prevent security problems such as missing terminal. Operation of developed functions was verified in a testbed emulating steel-making plant.

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An Energy-Efficient Routing Protocol based on Static Grid in Wireless Sensor Networks (무선 센서 네트워크에서 정적 그리드 기반의 에너지 효율적 라우팅 프로토콜)

  • Choi, Jae-Min;Mun, Hyung-Jin;Jeong, Yoon-Su;Lee, Sang-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.8A
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    • pp.791-800
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    • 2010
  • Recently wireless sensor networks as a field of ubiquitous computing technology was in the limelight. To use and collect the necessary information, Sink node mobility is essential. TTDD(Two-Tier Data Dissemination) proposed most common technique associated with Mobile sink node in wireless sensor networks, but issues exist that the use of many control packet falls into the energy efficiency. The technique for solving problems is Cluster-Based Energy-efficient Routing protocol (CBPER). But CBPER does not transmit the data correctly to sink node or source node. In this paper, we propose An Energy-Efficient Routing Protocol based on Static Grid using mobile sink nodes in order to solve the data transmission failure and reduce the energy consumption in Wireless Sensor Networks. We have evaluated it with the NS-2 simulator. Our results show that the proposed protocol saves the energy consumption up to 34% in comparison with CBPER. We also prove that the proposed protocol can transmit more accurate data to the sink de than CBPER.

Small-Scale Warehouse Management System by Log-Based Context Awareness (로그기반 상황인식에 의한 소규모 창고관리시스템)

  • Kim, Young-Ho;Choi, Byoung-Yong;Jun, Byung-Hwan
    • The KIPS Transactions:PartB
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    • v.13B no.5 s.108
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    • pp.507-514
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    • 2006
  • Various application systems are developed using RFID as a part of ubiquitous computing, and it is expected that RFID chip will become wide-spread for the distribution industry especially. Efficient and efact intelligent-type of warehouse management system is essential for small-to-medium-sized enterprises in the situation having a trouble in the viewpoint of expense and manpower. In this paper, we implement small-scale warehouse management system using log-based context awareness technology. This system is implemented to be controlled on web, configuring clients to control RFID readers and building up DBMS system in a server. Especially, it grasps user's intention of storing or delivering based on toE data for the history of user's access to the system and it reports user's irregular pattern of warehouse use and serves predictive information of the control of goods in stock. As a result, the proposed system can contribute to enhance efficiency and correctness of small-scale warehouse management.

Comparison of NTP and Master-Slave Network Synchronization Methods in in-door Environment (실내 망 동기화를 위한 NTP와 Master-Slave 방식의 비교)

  • Lee Hyojung;Kwon Youngmi
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.42 no.1
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    • pp.61-66
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    • 2005
  • Location Positioning is a major technology for ubiquitous computing. Recently the research on Location Positioning using UWB is on going. In order to construct an in-door location network, synchronization of base stations is very important. NTP is Popularly used as clock synchronization protocol ranging from LAN to WAN. Also Master-Slave scheme is the simplest method to synchronize in-door network. We compare and analyze NTP and Master-Slave schemes according to the statistical channel model for indoor multipath propagation environment. In this paper, error ranges are calculated at various circumstances that in-door network expands from one primary base station into several base stations. We compared the correctness of NTP and Master-Slave synchronization methods. NTP is more reasonable synchronization protocol in in-door environment.

Multi Spatial Interaction Interface in Large-scale Interactive Display Environment (대규모 인터랙티브 디스플레이 환경에서의 멀티 공간 인터랙션 인터페이스)

  • Yun, Chang-Ok;Park, Jung-Pil;Yun, Tae-Soo;Lee, Dong-Hoon
    • The Journal of the Korea Contents Association
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    • v.10 no.2
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    • pp.43-53
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    • 2010
  • The interactive display is providing various interaction modes to users through various ubiquitous computing technologies. These methods were studied for their interactions, but the limits that it is provided to only single user and the device usability were generated. In this paper, we propose a new type of spatial multi interaction interface that provide the various spatial touch interactive to multi users in the ambient display environment. Therefore, we generate the interaction surface so that a user can interact through the IR-LEDs Array Bar installed in the ceiling of the ambient display environment. At this time, a user can experience the various interactions through the spatial touch in an interaction surface. Consequently, this system offers the interactive display and interface method that the users can interact through natural hand movement without the portable devices.

A Study on the Selection Process of RFID Middleware and Quality Factor Evaluation in Ubiquitous Computing (유비쿼터스 컴퓨팅 환경에서 RFID 미들웨어 선정 프로세스 및 품질 요소 평가에 대한 연구)

  • Oh, Gi-Oug;Park, Jung-Oh
    • Journal of the Korea Society of Computer and Information
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    • v.16 no.12
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    • pp.257-263
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    • 2011
  • Conventional middleware is software providing services between clients and servers efficiently, but it is not applicable to RFID systems because of low consistency due to the absence of context awareness function, and problems in the management of meaning, security system, etc. Accordingly, we need a quality selection process and a quality evaluation method for selecting RFID middleware based on new criteria. This Paper proposed a new selection process based on international standard ISO/IEC 14598, and extracted and selected optimal quality factors through the proposed process. The selected quality factors were mapped to the quality characteristics of standard quality model ISO/IEC 9126, and to quality factors of RFID middleware of SUN, Microsoft, EPCglobal, IBM, etc. The results of these works showed that the quality factors extracted and selected through the proposed process were fair and adequate for evaluating the quality of RFID middleware.

Secure Knowledge Management for Prevent illegal data leakage by Internal users (내부 사용자에 의한 불법 데이터 유출 방지를 위한 안전한 지식관리 시스템)

  • Seo, Dae-Hee;Baek, Jang-Mi;Lee, Min-Kyung;Yoon, Mi-Yeon;Cho, Dong-Sub
    • Journal of Internet Computing and Services
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    • v.11 no.2
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    • pp.73-84
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    • 2010
  • Rapid development of Internet has increased users' desire for more information, and as a result, it created 'deluge of information', generating so much information. Especially, profit-pursuing corporations have done a lot of research to secure its own technological power. However, damages caused by illegal copy of information by illegal outside users or insiders are coming to the fore as social problem. Therefore, this paper is to propose secure knowledge management system to prevent illegal copy of data by insiders. The proposed scheme is a secure knowledge management system that carries out explicit authentication for internal users using 2MAC and provides data based on the authentication, thereby preventing illegal copy of data by insiders.

Development of a Spatio-Temporal DSMS for the Real-time Management of Moving Objects Data Stream (이동체 데이터 스트림의 실시간 관리를 위한 시공간 DSMS의 개발)

  • Shin, In-Su;Kim, Jang-Woo;Kim, Joung-Joon;Han, Ki-Joon
    • Journal of Korean Society for Geospatial Information Science
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    • v.20 no.1
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    • pp.21-31
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    • 2012
  • Recently, according to the development of ubiquitous computing technology, the efficient management of locations of moving objects is increasing rapidly in various fields. However, MODBMS and DSMS can not support the efficient real-time management of spatio-temporal stream data of moving objects. Therefore, this paper designed and implemented a spatio-temporal DSMS which can support the efficient real-time management of spatio-temporal stream data of moving objects. Especially, to develop the spatio-temporal DSMS, we extended STREAM of Stanford University and used GEOS that supports spatial data types and spatial operators of OGC. Finally, this paper proved the efficiency of the spatio-temporal DSMS by applying it to the real-time monitoring field which requires the real-time management of spatio-temporal stream data of moving objects.

Privacy Model based on RBAC for U-Healthcare Service Environment (u-헬스케어 환경에서 환자의 무결성을 보장하는 RFID 보안 프로토콜)

  • Rhee, Bong-Keun;Jeong, Yoon-Su;Lee, Sang-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.3
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    • pp.605-614
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    • 2012
  • Nowadays u-healthcare which is very sensitive to the character of user's information among other ubiquitous computing field is popular in medical field. u-healthcare deals extremely personal information including personal health/medical information so it is exposed to various weaknees and threats in the part of security and privacy. In this paper, RFID based patient's information protecting protocol that prevents to damage the information using his or her mobile unit illegally by others is proposed. The protocol separates the authority of hospital(doctor, nurse, pharmacy) to access to patient's information by level of access authority of hospital which is registered to management server and makes the hospital do the minimum task. Specially, the management server which plays the role of gateway makes access permission key periodically not to be accessed by others about unauthorized information except authorized information and improves patient's certification and management.

The Design and Implementation of Sensor Data Processing Module Based on TinyOS Utilizing TinyDB and LineTracer (TinyDB와 라인트레이서를 활용한 TinyOS기반의 센서 데이터 처리 모듈 설계 및 구현)

  • Lee, Sang-Hoon;Moon, Seung-Jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.10B
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    • pp.883-890
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    • 2006
  • The study of sensor network database is beginning to liven up as we are interested in Ubiquitous Computing technology in hardware, communication, database and so on. Especially, as new smart sensors have capabilities of real-time information gathering and analysis of each sensor node, data processing becomes an important issue in Ubiquitous Computing. In thesis, we have applied TinyDB(query processing system) to carry sensor node with line tracer which can follow the fixed path. After we gathered data around path, we have processed data in TinyDB GUI, gathered data, displayed data on a web server. Also we have a web browser on an embedded board for convenient user interface and implemented touch screen such that users can operate with a finger.