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Seonghun Kang,Chang Won Jung IET 2015 Electronics letters Vol.51 No.17
<P>A wearable fabric antenna on the upper arm is presented for on-body applications in the MedRadio band. The antenna was manufactured on a fabric substrate and operated at the Medical Device Radio Communications Service band (MedRadio band: 401-406 MHz). The antenna was designed to steer the beam directions. The use of two artificial switches enables a beam-steering capability. The dimensions of the proposed antenna are 50 × 20.5 × 0.66 mm<SUP>3</SUP> (676.5 mm<SUP>3</SUP>), and it utilises a fabric substrate (<I>ε</I><SUB>r</SUB> = 1.92, tan <I>δ</I> = 0.023). A one-layer skin model (<I>ε</I><SUB>r</SUB> = 46.74, <I>σ</I> = 0.69 S/m) is adopted for antenna simulation and measurement.</P>
Deep learning-assisted active noise control in a time-varying environment
Seonghun Im,Si Won Kim,Sunghwa Woo,Inman Jang,한태우,Uiwon Hwang,엄원석,이명한 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.3
The success of active noise control (ANC) is largely determined by the fidelity of the estimated secondary path, which encapsulates the "room acoustics" between the secondary sound source and the error sensor. In a time-invariant system the secondary path is usually measured and hard-coded in the controller prior to the ANC operation. When ANC is to be performed in a time-varying environment, however, the estimated secondary path should be updated accordingly, a task that poses many challenges in terms of efficacy, cost, and user comfort. In this paper we present a deep learning-assisted secondary path update technique, in which deep neural networks are trained to estimate the secondary path in real time according to changing boundary conditions. The feasibility of the technique is tested in an airborne duct, where the error sensor is allowed to move along the duct to simulate changes in boundary conditions. Results have shown that even in the face of a dramatic change in boundary conditions, the ANC system equipped with the present update scheme is capable of reducing broadband noise by up to 10 dB.
홍승만(Seonghun Kang),정창원(Chang Won Jung) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
본 논문에서는 다층전극구조의 투명전극 산화물을 이용하여 안경알 위에 올려진 투명한 안테나를 제안하였다. 제안된 안테나는 C58 안경렌즈 위에 제작되었고, 두부 인체의 패턴을 포함하여 성능을 측정하였다. 안테나의 동작번위는 2.4-2.5GHz로 블루투스 및 와이파이 대역을 포함한다. 안테나의 디자인은 안경알 상부형, 안경알 측부형, 안경테형의 세가지로 분류되며, 측정된 안테나의 최대이득은 2.89-3.56dBi로 제시되었다. 안테나의 효율 결과는 투명전극의 전도성이 안테나로서 사용되기에 충분하다는 것을 보여준다. 추가적으로 제안된 안테나의 SAR값은 기존 웨어러블 안경에 장착된 값보다 현저하게 떨어져 인체에 전자기파의 영향을 크게 줄여주는 장점이 있다.