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다양한 블록 길이를 갖는 적응형 리드솔로몬 복호기의 설계
공민한,송문규 원광대학교 공업기술개발연구소 2003 工業技術開發硏究誌 Vol.23 No.-
In this paper, an adaptive RS decoder using modified Euclid's algorithm has been designed. The implemented decoder allows the values of block length n, message length k hence the error-correcting capability t to be changed in real time at every codeword block. This unique feature is favorable for a shortened Reed-Solomon(RS) codes. A new architecture for a MEA cell suitable for decoding RS codes with variable block length is proposed. The proposed MEA cell uses both the recursive technique and the overclocking technique. An adaptive RS decoder over GF(2^(8)) having the error correcting capability of up to 10 has been designed in VHDL, and successfully synthesized in an FPGA.
수정 유클리드 알고리즘을 이용한 가변형 리드솔로몬 복호기의 설계
공민한,송문규 원광대학교 2003 論文集 Vol.31 No.-
In this paper, a versatile RS decoder using modified Euclid's algorithm has been designed. The implemented versatile decoder allows the values of block length n, message length k hence the error-correcting capability t to be changed in real time at every codeword block. This unique feature is favorable for a shortened RS codes. A new architecture is proposed for a MEA cell and employed suitable for decoding RS codes with variable block length. The proposed MEA cell uses both the recursive technique and the overclocking technique. A versatile RS decoder over GF(2^(8)) having the error correcting capability of up to 10 has been designed in VHDL, and successfully synthesized in a FPGA.
광대역 무선 접속을 위한 전송 수렴 부계층 하드웨어 설계
공민한,송문규 원광대학교 공업기술개발연구소 2003 工業技術開發硏究誌 Vol.23 No.-
In this paper, hardware design of a transmission convergence(TC) sublayer for the broadband wireless access(BWA) system based on EEE standard 802.16 is described. The TC sublayer provides interfacing function between a BWA PHY modem and a MAC layer. The TC hardware performs (1) formatting TC PDUs to MAC PDUs, (2) RS encoding/decoding (3) providing various control signals to a PHY modem. The TC hardware controls data traffic according to the DL MAP and UL MAP provided by the base station. The TC hardware for a subscriber station includes back-off algorithm used for collision resolution for the bandwidth request message and the initial raging request message at contention slots. The TC hardwares for a base station and a subscriber station have been designed in VHDL, and successfully synthesized in an FPGA chip.
Moon Kyou Song,Sung Hoon Kim 한국자기학회 2017 Journal of Magnetics Vol.22 No.2
Wireless magnet pumps are used in medical applications and are particularly useful as artificial heart ventricular assist devices (VADs). To investigate wireless operation of magnetic pumps, we fabricated three types of magnetic impellers using bonded magnets by blending magnetic powders of SmFeN, NdFeB, and Sr-ferrite. We investigated the magnetic properties of the fabricated magnetic impellers, which are driven by the application of magnetic coupling with an external driving magnet or external coil system, without a driving motor, shaft, or mechanical bearings. The use of wireless magnetic pumps is therefore not complicated by critical issues of size, heat, and vibration, which are very important issues for blood pumps. The magnetic properties of the impellers, such as their rotational speed, driving torque and hydrodynamic performance, determine their wireless driving ranges. We conducted performance evaluations of the impeller’s magnetic wireless manipulation, heat, and vibration. In addition, we carried out an animal test to confirm the suitability of the wireless magnetic pumps for use as biventricular assist devices (BiVADs).