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A Practical Approach to Robust Design of a RFID Triple-Band PIFA Structure
Jae-Hyeong Ko,Koon-Tae Kim,Dong-Hun Kim,Hyang-Beom Lee,Hyeong-Seok Kim IEEE 2010 IEEE transactions on magnetics Vol.46 No.8
<P>This paper presents a practical methodology of obtaining a robust optimal solution for a multi U-slot PIFA (Planar Inverted F-Antenna) structure with triple bands of 433 MHz, 912 MHz and 2.45 GHz. Using evolutionary strategy, a global optimum is first sought out in terms of the dimensions of the slots and shorting strip. Then, starting with the optimized values, Taguchi quality method is carried out in order to obtain a robust design of the antenna against the changes of uncontrollable factors such as material property and feed position. To prove the validity of the proposed method, the performance of the antenna is predicted by general-purpose electromagnetic software and also compared to experimental results.</P>
Parameter Extraction and Optimal Design of Spiral Inductor Using Evolution Strategy and Sensitivity
Jae-Hyeong Ko,Koon-Tae Kim,Jin-Kyu Byun,Hyeong-Seok Kim IEEE 2010 IEEE transactions on magnetics Vol.46 No.8
<P>For precise electromagnetic (EM) field simulation of the spiral inductor, electric conductivity of the inductor substrate is determined by evolution strategy to match the Taiwan Semiconductor Manufacturing Company (TSMC) process. Based on this parameter, patterned ground shield (PGS) of an on-chip spiral inductor is designed using deterministic optimization method. The design parameters are lengths and widths of ground strips and widths of slots. For sensitivity analysis, approximate adjoint variable method is used. Significant increase in <I>Q</I>-factor is observed in final design while reduction of inductance is minimal. Spiral inductor with optimized PGS is used in input matching circuit of 2.45-GHz low noise amplifier (LNA), which shows improved noise figure characteristics compared to non-PGS case.</P>
Park, Jae-Hyeong,Yoon, Jung-Yeon,Ko, Seon-Mi,Jin, Seon-Ah,Kim, Jun-Hyung,Cho, Chung-Hyun,Kim, Jin-Man,Lee, Jae-Hwan,Choi, Si-Wan,Seong, In-Whan,Jeong, Jin-Ok Korean Society for Biochemistry and Molecular Bion 2011 Experimental and molecular medicine Vol.43 No.8
Cardiac lymphatic system in the remodeling after acute myocardial infarction (AMI) has been overlooked. We wanted to investigate the role of bone marrow-derived endothelial progenitor cells (EPCs) and their contribution to lymphatic distribution in myocardial remodeling after AMI. Mouse (C57bl/6J) MI models were created by ligation of the left anterior descending coronary artery and were treated with phosphate buffered saline (PBS) or EPCs. Real-time RT-PCR with 2- to 4-week myocardial tissue samples revealed that lymphangiogenetic factors such as vascular endothelial growth factor (VEGF)-C (8.5 fold, $P$ < 0.05), VEGF-D (6.1 fold, $P$ < 0.05), Lyve-1 (15 fold, $P$ < 0.05), and Prox-1 (11 fold, $P$ < 0.05) were expressed at significantly higher levels in the PBS group than the EPC group. The PBS group also showed a significantly higher density of lymphatic vessels in the peri-infarction area. Echocardiography showed that from 2 weeks after the treatment, left ventricle (LV) dimensions at both systole and diastole were significantly smaller in the EPC group than in the PBS group ($P$ < 0.01) and LV fractional shortening was higher in the EPC group accordingly ($P$ < 0.01). Lymphangiogenic markers increased in a mouse MI model. EPC transplantation decreased lymphangiogenesis and adverse ventricular remodeling after AMI. These novel findings suggest that new lymphatic vessels may be formed in severely damaged myocardium, and may be involved in adverse myocardial remodeling after AMI.
진화전략기법을 이용한 무선 전력 전송용 이중대역 패치 안테나 최적 설계
고재형(Jae-Hyeong Ko),김군태(Koon-Tae Kim),권소현(So-Hyun Kwon),최혁재(Hyuk-Jae Choi),이제광(Je-Kwang Lee),김형석(Hyeong-Seok Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10
In this paper, we study on an optimal design of dual-band antenna using evolution strategy. The propsed antenna has multiple resonances of 2.4㎓ and 3.1㎓ to enhance the performance of the wireless power scavenging and obtaining. We design antenna structure that uses T-slotted aperture coupling between patch and feed line of ground plane. The resonant frequencies are 2.4㎓ and 3.05㎓ of simulation result using evolution strategy. Measured resonant frequencies are 2.44㎓ and 3.07㎓. which show a good agreement with the simulation results.