• Title, Summary, Keyword: Gen2

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Performance Analysis of Q-Algorithm According to Weight in Gen-2 RFID System (Gen-2 RFID 시스템에서 가중치에 따른 Q-알고리즘의 성능 분석)

  • Lim, In-Taek
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.529-531
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    • 2011
  • In Gen-2 Q-algorithm, the values of weight C, which is the parameter for incrementing or decrementing the slot-count size, are not defined in the standard. In this case, if the reader selects an inappropriate weight, there are a lot of empty or collided slots. As a result, the performance will be degraded because the frame size does not converge to the optimal point quickly during the query round. In this paper, we analyze how the performances of Gen-2 Q-algorithm will be affected by the weight value.

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Read Rate Analysis of RFID Gen 2 Tag in Frozen Seafood Traceability Systems (냉동수산물 이력제 식별수단으로써의 RFID Gen 2 태그의 인식률 분석)

  • Kim, Jin-Baek;Lee, Dong-Ho
    • The Journal of Fisheries Business Administration
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    • v.38 no.1
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    • pp.115-132
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    • 2007
  • Implementing the automatic identification in supply chain management is essential for effective and efficient process control. Though the GTIN based bar code system is generally used as an automatic identification method in most industries, it can not identify individual item, and is not appropriated for products' reliability and safety management. So the RFID system with EPC is considered as a better solution for resolving those problems. This study reviewed automatic identification code systems and the attributes and characteristics of RFID Gen 2 which became a global standard recently for supply chain management. Particularly, this study analyzed RFID Gen 2 systems' read rates on various conditions including distances between tags and readers and between antennas, condensation, and several packing materials in practical supply chain environment. The results of this study showed that the RFID Gen 2 had high read ratio in practical application and would be adopted as a new automatic identification means for traceability systems.

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The Design of Multi-Reader Management Module In Gen2 Protocol Based RFID Systems (Gen2 프로토콜 기반 RFID시스템에서의 다중 리더 관리 모듈 설계)

  • Han, Soo;Shin, Seung-Ho
    • Proceedings of the Korean Information Science Society Conference
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    • pp.172-176
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    • 2007
  • 유통분야에서 물품관리를 위해 사용되었던 바코드를 대체할 차세대 인식기술로 꼽히는 RFID 기술은 IT기술의 주요 시장으로 부상하면서 다양한 연구가 이루어지고 있는 분야이다. 유통 및 물류분야에서는 다량의 물품을 실시간으로 식별해야 하는 경우가 필요한데 이를 위해 여러 개의 리더가 동시에 사용 된다. RFID 시스템을 구축하는데 있어서 다중 리더 운영 기법은 전체 RFID 시스템의 성능을 좌우한다. EPCglobal에서 제안 된 Gen2 프로토콜은 900MHz 대역의 단일 통합 표준으로서 ISO/IEC 18000-6 C타입으로 채택되었다. 하지만 Gen2 프로토콜에서 다중 리더 운영 정책에 대해서 Session 기능을 간단히 내놓았을 뿐 자세한 소프트웨어 응용법을 제시하지 않았으며, 이에 관한 미들웨어 연구도 이루어지고 있지 않다. 본 논문에서는 현재 Gen2 프로토콜에서의 태그 인식 기술과 EPCglobal에서 제안하는 RFID 프로토콜, Sesssion 개념을 소개하고 Gen2 프로토콜을 이용하는 RFID 시스템에 다중 리더 관리 모듈을 설계를 통해 다중 리더를 운영하는 기법을 제안한다.

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Interference Analysis of RFID Gen-2 System Considering Both PHY and MAC Layers (PHY/MAC 계층을 모두 고려한 RFID Gen-2 시스템의 간섭 분석)

  • Yoon, Hyun-Goo;Choi, Sun-Woong;Jang, Byung-Jun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.7
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    • pp.752-760
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    • 2010
  • This paper investigates the performance of EPCglobal Generation-2(Gen-2) radio frequency identification(RFID) protocol under reader-to-reader interfering environments. We establish a modified discrete-time Markov chain(DTMC) model for the Gen-2 and accordingly obtain quantitative results of query success rate(QSR) and tag identification speed (TIS). Extensive simulations validate our theoretical analysis and demonstrate that the number of tags over 100 has little impact on the performance. TIS linearly decreases by 10 tags/sec/reader as the number of interfering readers increases. Our model for Gen-2 protocol is also useful to study the performance of other RFID protocols.

Performance Enhancement of Slot-Count Selection Algorithm with Weight Differentiation in Gen-2 RFID Systems (Gen-2 RFID 시스템에서 가중치 차별화를 통한 슬롯 카운트 선택 알고리즘의 성능 향상)

  • Lim, In-Taek
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.3
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    • pp.561-566
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    • 2011
  • In EPCglobal Class-1 Gen-2 RFID system, a slot-count selection algorithm has been proposed to determine the slot-count size depending on the status of reply slot. In the slot-count selection algorithm of Gen-2, the slot-count value is increased or decreased by the weight C, which is identical and independent of the slot status. It has an advantage that the algorithm is simple, but it is difficult to maintain an optimal slot-count size. Therefore, in this paper, we propose an adaptive slot-count selection algorithm, which applies the parameter C differently based on the result of tag replies. Through simulations, it is demonstrated that the collision rate for the proposed scheme is about 42% and 65% lower than the schemes proposed by Wang and Gen-2. Therefore, the adaptive slot-count selection algorithm achieves faster tag identification time compared with the existing algorithms due to the low collision rate.

Performance Analysis of Gen-2 Q-Algorithm According to Initial Slot-Count Size (초기 슬롯-카운트 크기에 따른 Gen-2 Q-알고리즘의 성능 분석)

  • Lim, In-Taek
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.445-446
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    • 2010
  • In Gen-2 Q-algorithm, the initial value of $Q_{fp}$, which is the slot-count parameter, is not defined in the standard. In this case, if we let the initial $Q_{fp}$ be large, the number of empty slot will be large during the initial query round. On the other hand, if the initial $Q_{fp}$ is small, almost all the slots will be collided. As a result, it is anticipated that the performance will be declined because the frame size does not converge to the optimal point quickly during the query round. In this paper, we analyze how the performances of Gen-2 Q-algorithm will be affected by the initial slot-count size.

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Three New Genera and Species of Siphonostomatoid Copepods (Crustacea) Associated with Sponges from Samar Island in the Philippines, with a Proposal of a New Family

  • Lee, Jimin;Kim, Il-Hoi
    • Animal Systematics, Evolution and Diversity
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    • v.34 no.2
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    • pp.79-91
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    • 2018
  • Three new genera and species of siphonostomatoid copepods are described as associates of sponges from shallow water of Samar Island in the Philippines: Samarus filipes n. gen., n. sp., Paurocheres dentatus n. gen., n. sp., and Platymyzon umbonatum n. gen., n. sp. A new family Samarusidae is proposed to accommodate Samarus n. gen. which has rudimentary legs 1-5 represented only by filiform setae. Paurocheres n. gen. is characterized by 2-segmented endopod of leg 4 and reduced setation of legs, and Platymyzon n. gen. by missing of mandibular gnathobase.

EPCglobal Gen 2 Tag Identification Performance Analysis Modifying the C model in the Q Algorithm (EPCglobal Gen 2 Q 알고리즘에서 C 모델에 따른 태그 인식 성능 평가)

  • Park, Jong-Myung;Cho, Sung-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.12B
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    • pp.1444-1451
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    • 2009
  • This paper first proposes diverse C determining models in the Q algorithm which is proposed in the EPCglobal C1 Gen 2 standard and then compares and analyzes its performance. EPCglobal C1 Gen 2 standard proposes the slot-count (Q) selection algorithm for multiple tag identification environment, but there is no such definition for the C value which modifies the Q value depending on collision or no reply. During the tag anti-collision process, the Q algorithm adds C to the Q when there is a collision and reduces the Q by C when there is no reply. The modified Q value updates new slot-counts for tags which determines the tag identification speed, so the C value is an important factor. However, many researches only intend to increase the tag identification speed by proposing a new method or modifying the Q algorithm without any research about the C value. This paper suggests diverse C models which satisfies the EPCglobal C1 Gen 2 and analyzes their performance in the multi tag identification environment. The result of this paper can be used as an index for future researches on EPCglobal C1 Gen 2 C models and multiple tag identification performance.

Implementation & Verification of RFID Gen2 Protocol on FPGA Prototyping board (FPGA를 이용한 RFID Gen2 protocol의 구현 및 검증)

  • Je, Young-Dai;Kim, Jae-Lim;Jang, Il-Su;Yang, Hoon-Gee
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.869-872
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    • 2008
  • This paper presents the VHDL implementation procedure of the passive RFID tag in Ultra High Frequency RFID system. The operation of the tag compatible with the EPCglobal Class1 Generation2(GEN2) protocol is verified by timing simulation after synthesis and implementation on prototyping board. Due to the reading range with relatively large distance, a passive tag needs digital processor which facilitates faster decoding, encoding and state transition for enhancement of the interrogation rate. Also with UART communication, verify a inventory Round in Gen2 Protocol. The verification results with the fastest data rate, 640kbps, and multi tags environment scenario show that the implemented tag spend 1.4ms transmitting the 96bits EPC to reader.

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Adaptive Q-Algorithm for Multiple Tag Identification in EPCglobal Gen-2 RFID System

  • Lim, In-Taek
    • Journal of information and communication convergence engineering
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    • v.8 no.3
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    • pp.307-311
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    • 2010
  • EPCglobal Class-1 Gen-2 protocol has been proposed for UHF-band RFID systems. In Gen-2 standard, Q-algorithm was proposed to select a frame size for the next query round without estimating the number of tags. Therefore, the Q-algorithm has advantage that the reader's algorithm is simpler than other algorithms. However, it is impossible to allocate the optimized frame size. Also, the original Q-algorithm did not define an optimized parameter C for adjusting the frame size. In this paper, we propose an adaptive Q-algorithm with the different parameter $C_c$ and $C_i$ in accordance with the status of reply slot. Simulation results show that the proposed adaptive Q-algorithm outperforms the original Gen-2 Q-algorithm.