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Junyoung Park,Joonsoo Kwon,Jinwook Oh,Seungjin Lee,Joo-Young Kim,Hoi-Jun Yoo IEEE 2012 IEEE journal of solid-state circuits Vol.47 No.11
<P>A low-power real-time traffic sign recognition system that is robust under various illumination conditions is proposed. It is composed of a Retinex preprocessor and an SVM processor. The Retinex preprocessor performs the Multi-Scale Retinex (MSR) algorithm for robust light and dark adaptation under harsh illumination environments. In the Retinex preprocessor, the recursive Gaussian engine (RGE) and reflectance engine (RE) exploit parallelism of the MSR tasks with a two-stage pipeline, and a mixed-mode scale generator (SG) with adaptive neuro-fuzzy inference system (ANFIS) performs parameter optimizations for various scene conditions. The SVM processor performs the SVM algorithm for robust traffic sign classification. The proposed algorithm-optimized small-sized kernel cache and memory controller reduce power consumption and memory redundancy by 78% and 35%, respectively. The proposed system is implemented as two separated ICs in a 0.13-μm CMOS process, and the two chips are connected using network-on-chip off-chip gateway. The system achieves robust sign recognition operation with 90% sign recognition accuracy under harsh illumination conditions while consuming just 92 mW at 1.2 V.</P>
A Capacitively Coupled Multi-Stage LC Oscillator
Park, Cheonwi,Park, Junyoung,Lee, Byung-Geun The Institute of Electronics and Information Engin 2015 IEIE Transactions on Smart Processing & Computing Vol.4 No.3
Coupling with a ring of capacitors introduces in-phase coupling current in multi-stage LC oscillators, increasing coupling strength and phase spacing accuracy. Capacitive coupling is effective at high-frequency applications because it increases coupling strength with the operating frequency. However, capacitive loading from the ring lowers operating frequency and reduces the tuning range. Mathematical expressions of phase noise and phase spacing accuracy with capacitive coupling are examined here, and transistor-level simulations confirm the effectiveness of the capacitive coupling.