• Title/Summary/Keyword: Tag

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Pseudorandom Tag Arrangement for RFID Based Mobile Robot Localization (RFID 기반 이동로봇 위치 추정을 위한 의사 랜덤 태그 배치)

  • Kim, Sung-Bok;Lee, Sang-Hyup
    • Proceedings of the IEEK Conference
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    • pp.103-105
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    • 2009
  • This paper presents a pseudorandom tag arrangement for improved RFID based mobile robot localization. First, four repetitive tag arrangements, including square, parallelogram, tilted square, and equilateral triangle, are examined. For each tag arrangement, the difficulty in tag installation and the problem of tag invisibility are discussed. Then, taking into account both tag invisibility and tag installation, a pseudorandom tag arrangement is proposed, which is inspired from a Sudoku puzzle. It is shown that the proposed tag arrangement exhibits spatial randomness quite successively without increased difficulty in installation.

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A RFID Tag Indexing Scheme Using Spatial Index (공간색인을 이용한 RFID 태그관리 기법)

  • Joo, Heon-Sik
    • Journal of the Korea Society of Computer and Information
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    • v.14 no.7
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    • pp.89-95
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    • 2009
  • This paper proposes a tag indexing scheme for RFID tag using spatial index. The tag being used for the inventory management and the tag's location is determined by the position of readers. Therefore, the reader recognizes the tag, which is attached products and thereby their positions can be traced down. In this paper, we propose hTag-tree( Hybrid Tag index) which manages RFID tag attached products. hTag-tree is a new index, which is based on tag's attributes with fast searching, and this tag index manages RFID tags using reader's location. This tag index accesses rapidly to tags for insertion, deletion and updating in dynamic environment. This can minimize the number of node accesses in tag searching comparing to previous techniques. Also, by the extension of MER in present tag index, it is helpful to stop the lowering of capacity which can be caused by parent node approach. The proposed index experiment deals with the comparison of tag index. Fixed Interval R-tree, and present spatial index, R-tree comparison. As a result, the amount of searching time is significantly shortened through hTag-tree node access in data search. This shows that the use of proposed index improves the capacity of effective management of a large amount of RFID tag.

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Improved Tag Selection for Tag-cloud using the Dynamic Characteristics of Tag Co-occurrence (태그 동시 출현의 동적인 특징을 이용한 개선된 태그 클라우드의 태그 선택 방법)

  • Kim, Du-Nam;Lee, Kang-Pyo;Kim, Hyoung-Joo
    • Journal of KIISE:Computing Practices and Letters
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    • v.15 no.6
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    • pp.405-413
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    • 2009
  • Tagging system is the system that allows internet users to assign new meta-data which is called tag to article, photo, video and etc. for facilitating searching and browsing of web contents. Tag cloud, a visual interface is widely used for browsing tag space. Tag cloud selects the tags with the highest frequency and presents them alphabetically with font size reflecting their popularity. However the conventional tag selection method includes known weaknesses. So, we propose a novel tag selection method Freshness, which helps to find fresh web contents. Freshness is the mean value of Kullback-Leibler divergences between each consecutive change of tag co-occurrence probability distribution. We collected tag data from three web sites, Allblog, Eolin and Technorati and constructed the system, 'Fresh Tag Cloud' which collects tag data and creates our tag cloud. Comparing the experimental results between Fresh Tag Cloud and the conventional one with data from Allblog, our one shows 87.5% less overlapping average, which means Fresh Tag Cloud outperforms the conventional tag cloud.

UHF & HF RFID Credit Card Size Tag Antenna Designs Using Silver-Ink and Jumper Structure (실버잉크와 점퍼구조를 사용한 신용카드 크기의 UHF & HF RFID 태그 안테나)

  • Nam, Sehyun;Chung, Youchung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.11
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    • pp.972-977
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    • 2016
  • This paper introduces development process and results of HF & UHF band(13.56 MHz, 920 MHz) tag antennas using a single-side printing method on a PE film. The size of tag antenna is designed in the area of $80mm{\times}50mm$, little bit smaller than a credit card. The UHF tag antenna, $76mm{\times}44mm$, is located at the outside of the card size tag antenna, and the HF tag antenna, $40 mm{\times}42 mm$, is located at the center of the UHF tag antenna. The UHF and HF tag antennas are designed with consideration of coupling effects. The single-side printing method with a jumper structure without using a via is used to make a loop antenna of HF tag antenna. The reading range of UHF tag antenna is about 6m, and the reading of HF tag antenna is about 5 cm. The designed tag antennas have long enough reading ranges for both bands. The tag is applicable to logistics and authentification.

Design of Accident Situation ID Recording System using JPMP-SID Security Tag (보안 JPMP-SID Tag를 활용한 사고 상황 ID 기록 시스템 설계)

  • Choi, Jang-Sik;Choi, Sung-Yeol;Kim, Sang-Choon
    • Convergence Security Journal
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    • v.11 no.3
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    • pp.85-90
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    • 2011
  • JPMP SID Tag is the security senor tag to provides physical information protective function using sensor module, has impossible feature to copy and fake the data which is stored in the tag. So data which is stored in the JPMP SID Tag has authenticity, integrity, originality. Therefore JPMP SID Tag could be applied in the place where the security of data is demanded. This paper propose the system using the JPMP SID Tag to acquire and protect digital evidence where cause investigation of accident is necessary. Also, proposed systems is complement of software security with composition secondary control logic for JPMP SID tag access control.

Design of Tag in-Tag out for ATP/ATO in the Light Rail and Monorail (경전철/모노레일의 ATP/ATO를 위한 Tag in-Tag out 설계)

  • Ryu, Deung-Ryeol;Lee, Key-Seo;Oh, Sang-Min
    • Proceedings of the KSR Conference
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    • pp.1264-1269
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    • 2008
  • We designed a track circuit of Tag in-tag out type that can be used for light rails and monorails. This method is called RFID-Tag and it literally uses RFID-Tag and replaces a fixed track circuit and implements a moving block. The distance between RFID-Tags is set to the length of a train and thus a train is always in contact with one of the tags. A train runs in RFID-Tag in -RFID-Tag out type at all times and the distance between trains can be precisely controlled through the application of a moving block combined with the basic principle of a fixed block, which enables the continuous speed control and enhances the satisfaction of passengers. When constructing a track circuit using RFID-Tag the Tag in-tag out brings us the cost reduction and is more economical than the existing fixed track circuit in that sense and easy for installation and maintenance. The wireless communication between onboard and wayside makes the continuous control possible and can improve the control capacity of ATP/ATO by the implementation of a moving block on top of a fixed one.

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A Low-Cost RFID Tag Search Protocol Preventing the Reuse of Mobile Reader's Tag-List (모바일 리더의 태그 리스트 재사용을 방지하는 저비용 RFID 태그 검색 프로토콜)

  • Yeo, Don-Gu;Lee, Sang-Rae;Choi, Hyun-Woo;Jang, Jae-Hoon;Youm, Heung-Youl
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.21 no.1
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    • pp.143-151
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    • 2011
  • When a real-time data transfer is not possible between a reader and a back-end server in the mobile environment, the reader should support a capability to search a certain tag without communicating with a back-end server. Some recent papers related to the mobile reader-based tag search protocol have addressed privacy concerns for the reader and the tags. However, to our best knowledge, there are no papers addressing the problem arising from reusing tag lists existed in the mobile reader. In other words, there arise a problem that a mobile reader which has lost an right to access to a specific tag is able to search that tag by reusing a tag list for searching a particular tag. If mobile reader having an unauthorized tag list, the mobile reader can reuse a particular tag list. Our protocol provides the enhanced secure tag lists preventing the reuse of the tag lists and an efficient tag search protocol based on dynamic identity in the mobile reader-based RFID environments.

OFSA: Optimum Frame-Slotted Aloha for RFID Tag Collision Arbitration

  • Lee, Dong-Hwan;Choi, Ji-Hoon;Lee, Won-Jun
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.5 no.11
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    • pp.1929-1945
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    • 2011
  • RFID technologies have attracted a lot of attention in recent years because of their cost/time-effectiveness in large-scale logistics, supply chain management (SCM) and other various potential applications. One of the most important issues of the RFID-based systems is how quickly tags can be identified. Tag collision arbitration plays a more critical role in determining the system performance especially for passive tag-based ones where tag collisions are dealt with rather than prevented. We present a novel tag collision arbitration protocol called Optimum Frame-Slotted Aloha (OFSA). The protocol has been designed to achieve time-optimal efficiency in tag identification through an analytic study of tag identification delay and tag number estimation. Results from our analysis and extensive simulations demonstrate that OFSA outperforms other collision arbitration protocols. Also, unlike most prior anti-collision protocols, it does not require any modification to the current standards and architectures facilitating the rollout of RFID systems.

RFID Tag Detection on a Water Content Using a Back-propagation Learning Machine

  • Jo, Min-Ho;Lim, Chang-Gyoon;Zimmers, Emory W.
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.1 no.1
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    • pp.19-31
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    • 2007
  • RFID tag is detected by an RFID antenna and information is read from the tag detected, by an RFID reader. RFID tag detection by an RFID reader is very important at the deployment stage. Tag detection is influenced by factors such as tag direction on a target object, speed of a conveyer moving the object, and the contents of an object. The water content of the object absorbs radio waves at high frequencies, typically approximately 900 MHz, resulting in unstable tag signal power. Currently, finding the best conditions for factors influencing the tag detection requires very time consuming work at deployment. Thus, a quick and simple RFID tag detection scheme is needed to improve the current time consuming trial-and-error experimental method. This paper proposes a back-propagation learning-based RFID tag detection prediction scheme, which is intelligent and has the advantages of ease of use and time/cost savings. The results of simulation with the proposed scheme demonstrate a high prediction accuracy for tag detection on a water content, which is comparable with the current method in terms of time/cost savings.

TagPlus: A Retrieval System using Synonym Tag in Folksonomy (TagPlus: 폭소노미에서 동의어 태그를 이용한 검색 시스템)

  • Lee, Sun-Sook;Yong, Hwan-Seung
    • Journal of Digital Contents Society
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    • v.8 no.3
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    • pp.255-262
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    • 2007
  • Collaborative tagging describes the process by which many users add metadata in the form of keywords to shared content. Recently, collaborative tagging has grown in popularity on the web, on sites that allow users to tag bookmarks, photographs, videos and other content. In this paper, we analyze the structure and basic knowledge of collaborative tagging systems as well as their dynamical aspects. We also present a retrieval system, TagPlus, using synonym tag that is derived from WordNet database. Specifically, TagPlus, a synonym tag based system has users retrieve images from Flickr system. The proposed system show the images tagged by not only the tag that users input but also the synonyms that are synonyms with the tag.

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