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RISS 인기검색어
- 검색키워드
- 저자 : Soonki Yoo (검색결과 3 건)
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- 유료
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Comparison of Planar Type Coils for Efficient Power Supply to Implantable Devices
김소희,Soonki Yoo 대한의용생체공학회 2012 Biomedical Engineering Letters (BMEL) Vol.2 No.3
Purpose Inductively coupled coils are widely used in wireless power supply to implanted medical devices. Planar coils fabricated on flexible substrates are advantageous over conventional wire-wound coils, in terms of its mechanical flexibility to fit surfaces conformally, low volume occupancy,and repeatable and reliable manufacturing. However, it suffers relatively lower quality factor and thus lower power transfer efficiency. To overcome these shortcomings, the quality factor of planar coils needs to be maximized. Methods One way to achieve this is to make planar coils in multiple layers. Double-layered planar coils connected either in series or in parallel were fabricated, and their electrical properties and performance in inductive power transfer were compared. Results When the secondary load was relatively small, the double-layered planar coil connected in parallel showed better performance in voltage and power reception. However,when the secondary load was relatively large, i.e. larger than the characteristic impedance of the receiver LC circuit, the double-layered coil connected in series achieved better power transmission. Conclusions Depending on the load of the secondary circuit,more efficienct power transmission can be achieved by connecting a double-layer planar coil either in parallel or in series.
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A Largely Deformable Surface Type Neural Electrode Array Based on PDMS
Namsun Chou,Soonki Yoo,Sohee Kim IEEE 2013 IEEE transactions on neural systems and rehabilita Vol.21 No.4
<P>This paper describes a largely deformable surface type neural electrode array based on polydimethylsiloxane (PDMS) for cortical use. Noncracked and reliable metal patterns were fabricated successfully on PDMS substrate by employing an intermediate parylene layer. The mechanical and electrical stability of the fabricated electrode arrays was demonstrated by repeatable bending test using a custom-designed bending test module. Also the adhesion of the electrode structure consisting of PDMS, parylene and metal layers was proven by ASTM tape test. The electrode impedance was measured in phosphate buffered saline (PBS) solution at 37°C over three months and analyzed using equivalent circuit models. Based on these results, it is concluded that the suggested electrode array provides a largely deformable structure with mechanical integrity and electrical stability, which can withstand mechanical stresses when inserted through a small trephination hole in the skull and expanded in the small room between the cortex and the skull without damage to the electrode array.</P>
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