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Convolutional Neural Network based Audio Event Classification
( Minkyu Lim ),( Donghyun Lee ),( Hosung Park ),( Yoseb Kang ),( Junseok Oh ),( Jeong-sik Park ),( Gil-jin Jang ),( Ji-hwan Kim ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.6
This paper proposes an audio event classification method based on convolutional neural networks (CNNs). CNN has great advantages of distinguishing complex shapes of image. Proposed system uses the features of audio sound as an input image of CNN. Mel scale filter bank features are extracted from each frame, then the features are concatenated over 40 consecutive frames and as a result, the concatenated frames are regarded as an input image. The output layer of CNN generates probabilities of audio event (e.g. dogs bark, siren, forest). The event probabilities for all images in an audio segment are accumulated, then the audio event having the highest accumulated probability is determined to be the classification result. This proposed method classified thirty audio events with the accuracy of 81.5% for the UrbanSound8K, BBC Sound FX, DCASE2016, and FREESOUND dataset.
JANG, Goo,HONG, SoGun,KANG, JungTaek,PARK, JungEun,OH, HyunJu,PARK, ChanKyu,HA, JiHong,KIM, DaeYong,KIM, MinKyu,LEE, ByeongChun Japanese Society of Veterinary Science 2009 The Journal of veterinary medical science Vol.71 No.9
<P>A recent emerging technology, somatic cell nuclear transfer (SCNT), has been considered for conserving threatened or endangered species. Sapsaree is a native breed in Korea and has been designated as a Natural Monument. The aim of this study was to produce a Sapsaree by SCNT for breed conservation. Donor fibroblasts from a 9-year-old male Sapsaree were placed into the perivitelline spaces of enucleated <I>in vivo</I> matured oocytes and fused electrically. A total of 309 cloned embryos were transferred into the oviducts of 15 naturally synchronized recipients. Two recipients were diagnosed as pregnant, and each delivered one cloned puppy, both of which weighed 530 g. Overall, this study demonstrated that an endangered canine breed can be conserved by SCNT.</P>
Single-axis Hardware in the Loop Experiment Verification of ADCS for Low Earth Orbit Cube-Satellite
Choi, Minkyu,Jang, Jooyoung,Yu, Sunkyoung,Kim, O-Jong,Shim, Hanjoon,Kee, Changdon The Institute of Positioning 2017 Journal of Positioning, Navigation, and Timing Vol.6 No.4
A 2U cube satellite called SNUGLITE has been developed by GNSS Research Laboratory in Seoul National University. Its main mission is to perform actual operation by mounting dual-frequency global positioning system (GPS) receivers. Its scientific mission aims to observe space environments and collect data. It is essential for a cube satellite to control an Earth-oriented attitude for reliable and successful data transmission and reception. To this end, an attitude estimation and control algorithm, Attitude Determination and Control System (ADCS), has been implemented in the on-board computer (OBC) processor in real time. In this paper, the Extended Kalman Filter (EKF) was employed as the attitude estimation algorithm. For the attitude control technique, the Linear Quadratic Gaussian (LQG) was utilized. The algorithm was verified through the processor in the loop simulation (PILS) procedure. To validate the ADCS algorithm in the ground, the experimental verification via a single axis Hardware-in-the-loop simulation (HILS) was used due to the simplicity and cost effectiveness, rather than using the 3-axis HILS verification (Schwartz et al. 2003) with complex air-bearing mechanism design and high cost.
Kim, Minkyu,Cho, Sunghun,Song, Jooyoung,Son, Suim,Jang, Jyongsik American Chemical Society 2012 ACS APPLIED MATERIALS & INTERFACES Vol.4 No.9
<P>Highly conductive silica/polyaniline (PANi) core/shell nanoparticles (NPs) were synthesized in various diameters (from 18 to 130 nm) using self-stabilized dispersion polymerization. The polymerization was carried out in an aqueous/organic liquid system at −30 °C. In this system, the organic phase plays a key role in directing para-direction oriented polymerization of the PANi on the surface of silica NPs. Because of its para-direction polymerized structure, the synthesized silica/PANi core/shell NPs exhibited enhanced electrical conductivity (25.6 S cm<SUP>–1</SUP>) compared with NPs (1.4 S cm<SUP>–1</SUP>) prepared by homogeneous polymerization. The conductivities and BET surface areas were 25.6 S cm<SUP>–1</SUP>/170 m<SUP>2</SUP> g<SUP>–1</SUP> (18 nm in diameter), 22.5 S cm<SUP>–1</SUP>/111 m<SUP>2</SUP> g<SUP>–1</SUP> (35 nm in diameter), 18.3 S cm<SUP>–1</SUP>/78 m<SUP>2</SUP> g<SUP>–1</SUP> (63 nm in diameter), and 16.4 S cm<SUP>–1</SUP>/53 m<SUP>2</SUP> g<SUP>–1</SUP> (130 nm in diameter). In this series, increased para-coupling along the polymer backbone was elucidated using several characterization techniques, including Fourier transform infrared (FTIR), X-ray diffraction (XRD), and nuclear magnetic resonance (NMR) spectroscopy. As-prepared silica/PANi core/shell NPs exhibited capacitance as high as 305 F g<SUP>–1</SUP>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2012/aamick.2012.4.issue-9/am300979s/production/images/medium/am-2012-00979s_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am300979s'>ACS Electronic Supporting Info</A></P>
Fabrication of Various Conducting Polymers Using Graphene Oxide as a Chemical Oxidant
Kim, Minkyu,Lee, Choonghyeon,Seo, Young Deok,Cho, Sunghun,Kim, Jihoo,Lee, Gyeongseop,Kim, Yun Ki,Jang, Jyongsik American Chemical Society 2015 Chemistry of materials Vol.27 No.18
<P>Recently, using graphene oxide (GO) for “carbocatalysis” has been very attractive as a novel application of graphene-based nanomaterials and is expected to open a host of possibilities for chemical synthesis because of the abundance of natural carbon sources, as well as the low density, extensive chemical functionalization, hydrophilicity, low cost, and ease of preparation. Here, we demonstrate that the GO can play a role as a chemical oxidant for various CPs (polythiophene, polyaniline, and polypyrrole), and diverse graphene–CP composites (graphene–polythiophene, graphene–polyaniline, and graphene–polypyrrole) can simply and rapidly be synthesized by using the GO as both graphene precursor and chemical oxidant. The UV–vis analysis confirms that the GO has successfully polymerized the CPs and been transformed to reduced graphene oxide (RGO). The SEM and TEM analyses show that the CPs have successfully been coated on the few-layered graphene sheets. Raman analysis and series of FT-IR analyses have been conducted to survey what functional group in the GO polymerized the monomers, and they reveal that hydroxyl and epoxy groups in the GO polymerized the monomers. Finally, plausible polymerization mechanisms have specifically and deeply proposed based on the IR result, classical radical polymerization mechanisms of the CPs, and widely adopted thermal reduction mechanism of the GO.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2015/cmatex.2015.27.issue-18/acs.chemmater.5b01408/production/images/medium/cm-2015-01408r_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm5b01408'>ACS Electronic Supporting Info</A></P>
실차의 구동조건을 이용한 변속기 습식 클러치 시스템의 열기계적 해석
여민규(Minkyu Yeo),이병민(Byungmin Lee),장용훈(Yong Hoon Jang),김철진(Chouljin Kim),서각하(Gakha Seo) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A transient thermomechanical analysis for the wet clutch system of automotive transmission under the practical operation modes is performed by using a commercial finite element package. ABAQUS. A frictionally excited heat generation at the contact interfaces is updated by using the variation of pressure and sliding speed according to the specific operation mode. To this end, the appropriate user subroutine of ABAQUS is modified. The results of this analysis is validated by the comparison of experimental results. The temperature distribution of clutches at each operation mode and the maximum temperature at the friction plate and steel plate during the operation is also presented to explain the thermal deformation of the clutches which are recognized as an important factor in the design of clutch.