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Park, Kyungsoon,Kim, Eunsung,Park, Jun Hui,Hwang, Seongpil Elsevier Inc. 2017 Electrochemistry Communications Vol.82 No.-
<P><B>Abstract</B></P> <P>The influence of an active vibration isolator (AVI) and electrochemical cell design on natural convection was investigated. The natural convection of an electrolyte caused by external vibrations and acoustic sounds is reduced by both an AVI and an acoustic enclosure. Slow scan voltammetry with an AVI shows a reproducible and predictable diffusion-controlled current down to 0.4mV/s. Reducing the distance between the working electrode and the glass wall also has a considerable effect on the voltammetric signal.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Vibration affects voltammetry at slow scan rates. </LI> <LI> Use of an active vibration isolator with an acoustic enclosure reduced natural convection. </LI> <LI> Reducing the gap between the electrode and the cell wall also reduced natural convection. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Park, Eunsung,Lee, Sangyun,Ronning, Filip,Thompson, Joe D,Zhang, Qiu,Balicas, Luis,Lu, Xin,Park, Tuson IOP 2018 Journal of Physics, Condensed Matter Vol.30 No.16
<P>Low-dimensional electronic systems with confined electronic wave functions have attracted interest due to their propensity toward novel quantum phases and their use in wide range of nanotechnologies. The newly discovered chalcogenide Nb<SUB>2</SUB>PdS<SUB>5</SUB> possesses a quasi-one-dimensional electronic structure and becomes superconducting. Here, we report spectroscopic evidence for two-band superconductivity, where soft point-contact spectroscopic measurements in the superconducting (SC) state reveal Andreev reflection in the differential conductance <I>G</I>. Multiple peaks in <I>G</I> are observed at 1.8 K and explained by the two-band Blonder–Tinkham–Klapwijk model with two gaps Δ<SUB>1</SUB> = 0.61 meV and Δ<SUB>2</SUB> = 1.20 meV. The progressive evolution of <I>G</I> with temperature and magnetic field corroborates the multiple nature of the SC gaps.</P>
A Novel Bt-Plus Development to Control the Brassica Leaf beetle, Phaedon brassicae
Eunsung Kim,Youngjin Park,Yonggyun Kim 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04
Cabbage is one of the major vegetable crops especially in Korea. Various insect pests intimidate the cabbage production. Moreover, an excessive spray of chemical insecticides leads to development of insecticide resistance as well adverse effects on environment and humans. The brassica leaf beetle, Phaedon brassicae, is a coleopteran pest. Both larval and adult stages feed cabbage. This study aimed to develop an effective microbial biopesticide against P. brassicae by adding immunosuppressive agent to Bacillus thurigiensis (Bt). To determine an optimal immunosuppressive agent, two bacterial species of Photorhabdus temperata subsp. temperata (Ptt) and Xenorhabdus nematophila were compared in their insecticidal activity against P. brassicae, and Ptt was selected. Among four subspecies of Bt, B. thuringiensis subsp. tenebrionis (Btt) was selected. Ptt bacterial culture broth possessed immunosuppressive agent(s) because the bacterial culture broth significantly increased other bacterial growth in P. brassicae hemolymph. When the Ptt broth was added to Btt, it significantly increased the insecticidal activity of Btt. Bt-Plus was prepared by mixing Btt and Ptt bacterial culture and sprayed the cabbage infested by P. brassicae. The Bt-Plus was much more effective than Btt treatment. This study reports a novel Bt insecticide to control P. brassicae.
Antenna Placement Optimization for Distributed Antenna Systems
Eunsung Park,Sang-Rim Lee,Inkyu Lee IEEE 2012 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.11 No.7
<P>In this paper, we propose new algorithms to determine the antenna location for downlink distributed antenna systems (DASs) in single-cell and two-cell environments. We consider the composite fading channel which includes small and large scale fadings. First, for the single-cell DAS, we formulate the optimization problem of distributed antenna (DA) port locations by maximizing the lower bound of the expected signal to noise ratio (SNR). In comparison to the conventional algorithm based on the squared distance criterion which requires an iterative method, our problem generates a closed form solution. Next, for the two-cell DAS, we propose a gradient ascent algorithm which determines the optimum DA locations by maximizing the lower bound of the expected signal to leakage ratio (SLR). In our work, we consider selection transmission, maximal ratio transmission and zero-forcing beamforming (ZFBF) under sum power constraint and study equal gain transmission and scaled ZFBF under per-antenna power constraint. Simulation results show that our proposed algorithms based on both the SNR and the SLR criteria offer a capacity gain over the conventional centralized antenna systems.</P>
Feedback Bit Allocation Schemes for Multi-User Distributed Antenna Systems
Eunsung Park,Heejin Kim,Haewook Park,Inkyu Lee IEEE 2013 IEEE COMMUNICATIONS LETTERS Vol.17 No.1
<P>In this paper, we propose a feedback bit allocation algorithm for multi-user downlink distributed antenna systems with limited feedback. We consider a composite fading channel with small scale fadings and path loss, and assume the case where each user is served by only one distributed antenna (DA) port while each DA port can support any number of users. In order to efficiently determine bit allocation, we propose an iterative algorithm which minimizes an upper bound of a mean rate loss. Compared to conventional bit allocation methods, the proposed algorithm can be applied to more general system configurations. Simulation results show that our proposed algorithm offers a performance gain of 20% over an equal bit allocation scheme.</P>
3D Sensing System for Laser-Induced Breakdown Spectroscopy-Based Metal Scrap Identification
Seongyun Park,Jaepil Lee,Eunsung Kwon,Daewon Kim,Sungho Shin,Sungho Jeong,Kyi-Hwan Park 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.3
Laser-induced breakdown spectroscopy (LIBS) is an analysis technique that determines the elemental composition of a target material. Metal scraps have a range of shapes and are contaminated with other substances such as paint or dirt. This makes it difficult to recognize each piece of metal scrap accurately and to obtain clear LIBS emission spectra of the target metals. In this study, two image processing algorithms are proposed to measure the three-dimensional shapes of metal scraps and to calculate the optimized (i.e., relatively clean and flat) surface areas of metal scraps. It was confirmed that 25% higher maximum classification accuracy was achieved when LIBS spectra were acquired from optimized rather than non-optimized (i.e., contaminated) surfaces.
스마트 케어 감시 시스템에서 한 대의 CCTV를 이용한 GPS 위치정보의 보정 방법
박은성(Park, Eunsung),김기용(Kim, Kiyong) 한국전기전자학회 2016 전기전자학회논문지 Vol.20 No.2
스마트 케어 감시 시스템은 스마트 디바이스에 내장된 GPS 수신 기능을 사용하여 이용자의 위치 정보를 획득하고 주변의 CCTV를 제어하여 이용자를 추적하는 시스템이다. 그러나 일반적인 스마트 디바이스의 GPS 위치 정보는 상당한 오차를 포함하고 있기 때문에 추적을 원활히 하기 위하여 GPS 위치 정보의 보정을 필요로 한다. 기존의 스마트 케어 시스템에서는 두 대 이상의 CCTV를 이용하여 이러한 GPS 위치 정보 오차를 보정하였다. 그러나 이러한 방법은 반드시 두 대 이상이 동일한 지점을 촬영해야 하는 단점이 있다. 본 논문에서는 위치 정보의 오차를 보정하기 위하여 단지 하나의 CCTV만을 이용하는 새로운 방법을 제안한다. 실험 결과, 하나의 CCTV만을 이용하더라도 두 대의 CCTV를 이용한 위치 정보 보정방법 만큼 정확도가 향상되었음을 확인할 수 있다. Smart care surveillance system can take the position information of the user and monitor by controlling neighbor CCTVs using GPS receiver built into smart device. But because the position information contains a significant error, in general smart device, it is necessary to be corrected for precise monitoring. In previous smart care system, this error is corrected by using a plurality of CCTV. But it has disadvantage that two or more CCTVs pointed toward the same point at the same time. In this paper, we propose the method to correct error of the GPS location information by using only one CCTV. With experiment result, we find that the accuracy of GPS location information corrected with only one CCTV is as improved as two CCTVs.