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Jeon, Soo-kyung,Kwon, Man Jae,Yang, Jung-seok,Lee, Seunghak Elsevier 2017 The Science of the total environment Vol.601 No.-
<P><B>Abstract</B></P> <P>The contribution by anthropogenic sources to abnormally high Zn concentrations in soils with naturally abundant Zn was investigated at a contaminated site surrounding a Zn smelter in eastern Korea. Nineteen soil samples were collected within a 2km radius of the smelter, and analyzed for metal concentrations and Pb isotope ratios using an inductively coupled plasma-optical emission spectrometer and -mass spectrometer, respectively. Higher Zn concentrations in locations closer to the smelter implied that the smelter was the source of the Zn pollution. Lead isotope ratios (<SUP>206/207</SUP>Pb) from soil samples assumed to be unaffected by the smelter were higher than those found in the contaminated area, suggesting that the raw materials of Zn concentrates (ZnS, sphalerites) and smelting by-products from the smelter with low <SUP>206/207</SUP>Pb ratios were the anthropogenic Zn source impacting the area. To verify this finding, the mineralogical forms of Zn found in the different soil fractions were investigated by X-ray diffraction analysis, scanning-electron-microscope energy-dispersive spectrometer analysis, and sulfur element analysis. Since approximately 50% of Zn concentrates have particle sizes less than 0.044 mm, the observation of sphalerites and elevated sulfur concentrations in the finer soil fraction (<0.044mm) provide substantial support to the hypothesis that the deposition of airborne Zn-containing dust from the smelter is responsible for the high Zn concentration in the area.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Anthropogenic sources of Zn in soils with naturally abundant Zn were investigated. </LI> <LI> <SUP>206/207</SUP>Pb was helpful in studying the contribution of the smelter to Zn contamination. </LI> <LI> Mineralogical analysis can provide evidence regarding pollution sources. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Implementation of AIoT Edge Cluster System via Distributed Deep Learning Pipeline
Jeon, Sung-Ho,Lee, Cheol-Gyu,Lee, Jae-Deok,Kim, Bo-Seok,Kim, Joo-Man The Institute of Internet 2021 International journal of advanced smart convergenc Vol.10 No.4
Recently, IoT systems are cloud-based, so that continuous and large amounts of data collected from sensor nodes are processed in the data server through the cloud. However, in the centralized configuration of large-scale cloud computing, computational processing must be performed at a physical location where data collection and processing take place, and the need for edge computers to reduce the network load of the cloud system is gradually expanding. In this paper, a cluster system consisting of 6 inexpensive Raspberry Pi boards was constructed to perform fast data processing. And we propose "Kubernetes cluster system(KCS)" for processing large data collection and analysis by model distribution and data pipeline method. To compare the performance of this study, an ensemble model of deep learning was built, and the accuracy, processing performance, and processing time through the proposed KCS system and model distribution were compared and analyzed. As a result, the ensemble model was excellent in accuracy, but the KCS implemented as a data pipeline proved to be superior in processing speed..
Physics-Based SPICE Model of a-InGaZnO Thin-Film Transistor Using Verilog-A
Jeon, Yong-Woo,Hur, In-Seok,Kim, Yong-Sik,Bae, Min-Kyung,Jung, Hyun-Kwang,Kong, Dong-Sik,Kim, Woo-Joon,Kim, Jae-Hyeong,Jang, Jae-Man,Kim, Dong-Myong,Kim, Dae-Hwan The Institute of Electronics and Information Engin 2011 Journal of semiconductor technology and science Vol.11 No.3
In this work, we report the physics-based SPICE model of amorphous oxide semiconductor (AOS) thin-film transistors (TFTs) and demonstrate the SPICE simulation of amorphous InGaZnO (a-IGZO) TFT inverter by using Verilog-A. As key physical parameter, subgap density-of-states (DOS) is extracted and used for calculating the electric potential, carrier density, and mobility along the depth direction of active thin-film. It is confirmed that the proposed DOS-based SPICE model can successfully reproduce the voltage transfer characteristic of a-IGZO inverter as well as the measured I-V characteristics of a-IGZO TFTs within the average error of 6% at $V_{DD}$=20 V.
Development of a Femur Neck Bone Mineral Density Measuring Device for Accurate Examination
Man-Seok Han,Sun-youl Seo,Yong-Kyun Kim,Min-Cheol Jeon,Hyun-kuk Lee,Se-Jong Yoo 한국자기학회 2016 Journal of Magnetics Vol.21 No.2
In bone density examinations, a change in the measured BMD occurs owing to the differences between the measured areas. To address this problem, we aimed to develop a new auxiliary device that could be rotated by 15o by fixing the ankle to the distal femur neck. Dual energy X-ray absorptiometry (DXA) of BMD examinations were performed once a year, but 10 patients were examined over three sessions to analyze the area for measuring the femur neck BMD. The goal of this test was to determine the device’s reliability, and the results were expressed in terms of the standard deviation of measurements. After performing bone density measurements using the new auxiliary device on 10 normal patients, with three measurements for each patient, the obtained standard deviation was 0.03. The standard deviation of the measured BMD was 0.19 when using the currently existing auxiliary device, while the standard deviation of the measured BMD was 0.03 when using the new auxiliary device. By using the new auxiliary device, the standard deviation could be reduced by ~80%. Accurate rotation of the femur neck was possible in all examinations, and the standard deviation of BMD measurements could be reduced by up to 80% compared with the measurements performed using the currently existing auxiliary device. We hope that this advantageous new design can be used as a standard auxiliary device for measuring the femur neck BMD.