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The Study of Particle Filter Localization Algorithm Based on Magnetic Field Data
Chang, Kun,Huang, He,Jing, Changfeng,Deng, Nanshan 대한공간정보학회 2016 대한공간정보학회지 Vol.24 No.2
Most of the indoor positioning algorithms based on magnetic data mainly focus on reducing the accumulated error of the odometry data, such as signals produced by the inertial sensors. However, in most cases such as positioning by using smartphones in the indoor environment, those approaches seem unfeasible due to the absence of the inertial sensors. Thus, in this paper, we try to study a positioning algorithm exclusively based on the magnetic data. We refer to some thinking from the steps of Particle Filter and conduct an experiment to verify the application of the new algorithm. Besides, we use the variance of the result of the previous step to decrease the area to be matched in the next step, intending to improve the accuracy of the results. The result of the experiment shows that the new algorithm has a high probability to match with accuracy less than 2 meters in a 24 meters by 2.6 meters corridor.
Tournament-Shaped Magnetically Coupled Power-Combiner Architecture for RF CMOS Power Amplifier
Changkun Park,Dong Ho Lee,Jeonghu Han,Songcheol Hong Professional Technical Group on Microwace Theory a 2007 IEEE transactions on microwave theory and techniqu Vol.55 No.10
<P>A tournament-shaped magnetically coupled power-combiner architecture for a fully integrated RF CMOS power amplifier is proposed. Various 1 : 1 transmission line transformers are used to design the power combiner. To demonstrate the new architecture, a 1.81-GHz CMOS power amplifier using the tournament-shaped power combiner was implemented with a 0.18-mum RF CMOS process. All of the matching components, including the input and output transformer, were fully integrated. The amplifier achieved a drain efficiency of 38% at the maximum output power of 31.7 dBm.</P>
Changkun Choi,정영삼,권용재 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.3
We investigate sensitivity and limit of detection (LOD) of trace copper (Cu) metal using pristine carbon nanotube (CNT) and acidified CNT (ACNT) electrodes. Squarewave based anodic stripping voltammetry (SWASV) is used to determine the stripped Cu concentration. Prior to performing the SWASV measurements, its optimal conditions are determined and with that, effects of potential scan rate and Cu2+ concentration on stripping current are evaluated. The measurements indicate that (1) ACNT electrode shows better results than CNT electrode and (2) stripping is controlled by surface reaction. In the given Cu2+ concentration range of 25- 150 ppb, peak stripping current has linearity with Cu2+ concentration. Quantitatively, sensitivity and LOD of Cu in ACNT electrode are 9.36 μA μM−1 and 3 ppb, while their values are 3.99 μA μM−1 and 3 ppb with CNT electrode. We evaluate the effect of three different water solutions (deionized water, tap water and river water) on stripping current and the confirm types of water don’t affect the sensitivity of Cu. It turns out by optical inspection and cyclic voltammetry that superiority of ACNT electrode to CNT electrode is attributed to exfoliation of CNT bundles and improved interfacial adhesion occurring during oxidation of CNTs.