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능동형 RFID시스템에서 태그 인식 속도 향상을 위한 고속 태그 충돌 방지 알고리즘
이한영,Lee, Han-Young 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.2
In RFID System, one of the problem that we must slove is to devise a good anti-collision algorithms to improve the efficiency of tag identification which is usually low because of tag collision. Among of the existing RFID anti-collision algorithm, BS (Binary Search) algorithm, though simple, has a disadvantage that the stage of times used to identify the tags increase exponentially as the number of tags does. In this paper, I propose a new anti-collision algorithm called Multi-collision reflected frame which restricts the number of stages and decided bit. Since the proposal algorithm keep the length size of UID and density of total tag when have 100%. The simulation results showed that the proposed algorithm improves the efficiency by 30~50% compared to the existing algorithm.
광대역 이중편파 무선 중계기용 패치안테나 설계 및 제작
이한영,Lee, Han-Young 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.6
In this paper, a dual polarization patch antenna operates at the wide bandwidth of 1.525GHz~1.665GHz was designed and fabricated. To obtain the wide bandwidth and high gain, increased height of air floor from GND was applied, and to get wide band axial ratio and high gain, parasitic patch was applied. The simulation and measurement showed good agreements, the VSWR was less than 1.9 at the frequency bandwidth, the return loss was less than -10dB, and the LHCP(Left Hand Circular Polarization) and RHCP(Right Hand Circular Polarization) isolation was less than -13dB at the frequency bandwidth.
Application of Ball-Milled Powder Mixture to Intermetallics Coating Through Reaction Synthesis
이한영,Tae-Jun Kim,Yong-Jae Cho 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.6
The application of ball-milling for reactant powders to improve the intermetallic coating reaction was examined. Ni-50 at.% Al powder compacts milled at three different ball-to-powder weight ratios in a planetary mill were analyzed by differential scanning calorimetry (DSC) and coated onto mild steel through the reaction synthesis in a hot press. The effects of ball-milling on the coating reaction in the hot press were compared with those in the reaction synthesis in DSC. The experimental results show that the particle size of the elemental powders was decreased by ball-milling, and that the coating reaction in the hot press was enhanced by ball-milling for the reactant powders, unlike the reaction synthesis in DSC. This improvement was attributed to the increase in the density of the reactant compact by the load applied during the reaction.
이한영,배지훈,장승환 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.16 No.8
The aim of this study was to determine the appropriate driving strain history of a dynamic cell culture device for inducing accelerated cell differentiation. Silicone rubber film is an electroactive polymer and was used as a flexible cell stimulator to transfer mechanical strains to developing cells. Mechano-regulation theory with a deviatoric strain was used to estimate tissue differentiation under strain conditions during iterative calculations by means of finite element analysis. Various driving strain histories comprising 4%, 5%, and 6% strains were introduced to determine the correlation between the strain history and the development of cell phenotypes. The simulation results revealed that driving strain conditions mainly comprising low levels of strain (4%) provided appropriate conditions for differentiating mesenchymal cells into osteoblasts.