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Class 4 Active RFID Multi-hop Relay System based on IEEE 802.15.4a Low-Rate UWB in Sensor Network
( Hong Zhang ),( Sunghyun Hong ),( Kyunghi Chang ) 한국인터넷정보학회 2010 KSII Transactions on Internet and Information Syst Vol.4 No.3
The low-rate (LR) UWB is a promising technology for the ubiquitous sensor network (USN) due to its extremely low power consumption and simple transceiver implementation. However the limited communication range is a bottleneck for its widespread use. This paper deals with a new frame structure of class 4 active RFID multi-hop relay system based on ISO/IEC 18000-7 standard integrating with IEEE 802.15.4a LR-UWB PHY layer specification, which sets up a connection to USN. As a result of the vital importance of the coverage and throughput in the application of USN, further we analyze the performance of the proposed system considered both impulse radio UWB (IR-UWB) and chirp spread spectrum (CSS). Our simulation results show that the coverage and throughput are remarkably increased.
ISO/IEC 18000-7 433㎒ 능동형 RFID 시스템 기반의 인식거리 향상을 위한 멀티홉 릴레이 시스템
홍성현(SungHyun Hong),송인찬(InChan Song),장홍(Hong Zhang),장경희(KyungHi Chang),신동범(Dong-Beom Shin),이형섭(Heyung-Sub Lee) 한국통신학회 2009 韓國通信學會論文誌 Vol.34 No.5C
본 논문에서는 능동형 RFID 시스템인 ISO/IEC 18000-7 및 ISO/IEC 18000-4 시스템에 대하여 살펴보고, 능동형 RFID 태그로 구성된 센서 네트워크에서 인식거리 향상을 위해 능동형 RFID 릴레이 태그를 사용하는 RFID 멀티홉 릴레이 시스템을 제안한다. 기존 ISO/IEC 18000-7 시스템과 제안된 RFID 멀티홉 릴레이 시스템의 성능평가를 위하여 Sensitivity에 의한 인식거리 및 시스템 효율과 같은 항목을 새롭게 정의하며, MCL (Minimum Coupling Loss) 분석과 SLS (System Level Simulation) 분석을 통해 제안된 시스템의 성능을 비교 및 분석한다. In this paper, we analyze the active RFID systems ISO/IEC 18000-7 and ISO/IEC 18000-4. In order to improve the coverage in sensor networks, which consist active RFID tag, we propose RFID multi-hop relay system using active RFID relay tag. To compare the performance between the existing ISO/IEC 18000-7 system and the proposed RFID multi-hop relay system, we introduce new system efficiency measure and sensitivity-based measure of achieved coverage. Also, we analyze the performance of the proposed system and compare it with that of the existing system through MCL (Minimum Coupling Loss) analysis and SLS (System Level Simulation) analysis.
Development of indirect method for clothing pressure measurement using three-dimensional imaging
Lee, Yejin,Hong, Kyunghi SAGE Publications 2013 Textile Research Journal Vol.83 No.15
<P>A direct measurement method using an air-pack-type pressure sensor has been used widely to obtain clothing pressure, but this method still has many limitations. For instance, it gives only pointwise information and is inherently inconvenient and error-prone. Therefore, we suggest an indirect method for measuring the clothing pressure of various positions at once without touching the subject by using three-dimensional (3D) deformations of a reference shape (i.e., a circle grid) printed on clothing. The clothing pressure can be obtained with a simple analysis of tensile stress and the curvature data extracted from the 3D deformation of circle grids on the clothing surface. Specifically, the tensile stress of the fabric was obtained from a tensile tester and the direction of the principal stress and the radius of curvature in the principal direction were measured from 3D imaging data to obtain an accurate value. The clothing pressure from the indirect method was verified by comparing the results from direct pressure measurements using an air-pack-type pressure sensor. The indirect method was found to successfully estimate the clothing pressure.</P>