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Voice activity detection based on deep belief networks using likelihood ratio

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Journal of Central South University 2016年第1期23卷 145-149页

作者： KIM Sang-Kyun PARK Young-Jin lee sangmin Department of Electronic Engineering Inha University Incheon 402-751 Korea Korea Electrotechnology Research Institute (KERI) 111 Hanggaul ro Sangrok Gu An-San shi Kyunggi Do 426-170 Korea Institute for Information and Electronics Research Inha University Incheon 402-751 Korea

A novel technique is proposed to improve the performance of voice activity detection(VAD) by using deep belief networks(DBN) with a likelihood ratio(LR). The likelihood ratio is derived from the speech and noise spectral components that are assumed to follow the Gaussian probability density function(PDF). The proposed algorithm employs DBN learning in order to classify voice activity by using the input signal to calculate the likelihood ratio. Experiments show that the proposed algorithm yields improved results in various noise environments, compared to the conventional VAD algorithms. Furthermore, the DBN based algorithm decreases the detection probability of error with [0.7, 2.6] compared to the support vector machine based algorithm.

关键词：网络语音检测概率似然比 VAD算法支持向量机算法概率密度函数 DBN 信念网络

Room temperature hydrogen sensing performances of multiple networked Ga N nanowire sensors codecorated with Au and Pt nanoparticles

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Journal of Central South University 2015年第5期22卷 1614-1618页

作者： PARK Sunghoon KIM Soohyun PARK Suyoung lee sangmin lee Chongmu Department of Materials Science and Engineering Inha University 253 Yonghyun-dong Nam-gu Incheon 402-751 Korea Department of Electronic Engineering Inha University 253 Yonghyun-dong Nam-gu Incheon 402-751 Korea

The sensing performances of multiple networked Ga N nanowire(NW) sensor codecorated with Au and Pt nanoparticles were examined. The pristine Ga N nanowires show responses of approximately 108%-173% to 0.05%-0.25% H2 at room temperature. On the other hand, the Ga N nanowires decorated with Au and those decorated with Pt lead to 1.1-1.3 and 1.2-1.6 times,respectively, stronger responses to 0.05%-0.25% H2. In contrast, the Au Pt-codecorated Ga N nanowires show 1.3-2.0 times stronger responses to 0.05%-0.25% H2. In other words, the Ga N nanorods codecorated with Au and Pt nanoparticles show much stronger response to H2 gas than the Au or Pt monometal-decorated counterpart. The underlying mechanism for the enhanced response of the Au Pt-codecorated Ga N nanowire was discussed.

关键词： Ga N nanowires metal catalyst bimetallic system gas sensor codecoration

HOS1 Facilitates the Phytochrome B-Mediated Inhibition of PIF4 Function during Hypocotyl Growth in Arabidopsis

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Molecular Plant 2017年第2期10卷 274-284页

作者： Ju-Heon Kim Hyo-Jun lee Jae-Hoon Jung sangmin lee Chung-Mo Park Department of Chemistry Seoul National University Seoul 08826 Korea Sainsbury Laboratory University of Cambridge Cambridge CB2 1LR UK Plant Genomics and Breeding Institute Seoul National University Seoul 08826 Korea These authors contributed equally to this article Present address: SK Innovation Daejeon 34124 Korea

Upon exposure to light, developing seedlings undergo photomorphogenesis, as illustrated by inhibition of hypocotyl elongation, cotyledon opening, and leaf greening. During hypocotyl photomorphogenesis, light signals are sensed by multiple photoreceptors, among which the red/far-red light-sensing phytochromes have been extensively studied. However, it is not fully understood how the phytochromes modulate hypo- cotyl growth. Here, we demonstrated that HIGH EXPRESSION OF OSMOTICALLY RESPONSIVE GENES 1 （HOS1）, which is known to either act as E3 ubiquitin ligase or affect chromatin organization, inhibits the transcriptional activation activity of PHYTOCHROME INTERACTING FACTOR 4 （PIF4）, a key transcrip- tion factor that promotes hypocotyl growth. Consistent with the negative regulatory role of HOSl in hypo- cotyl growth, HOSl-defective mutants exhibited elongated hypocotyls in the light. Notably, phyB induces HOS1 activity in inhibiting PIF4 function. Taken together, these observations provide a molecular basis for the phyB-mediated suppression of hypocotyl growth in Arabidopsis.

关键词： photomorphogenesis hypocotyl growth phytochrome signaling HOS1 PIF4

Variable step-size affine projection algorithm based on global speech absence probability for adaptive feedback cancellation

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Journal of Central South University 2014年第2期21卷 646-650页

作者： KIM Young-Sear SONG Ji-hyun KIM Sang-Kyun lee sangmin Department of Biomedical Engineering Eulji University Department of Electronic Engineering Inha University Institute for Information and Electronics Research Inha University

A novel approach is proposed for improving adaptive feedback cancellation using a variable step-size affine projection algorithm(VSS-APA) based on global speech absence probability(GSAP).The variable step-size of the proposed VSS-APA is adjusted according to the GSAP of the current *** weight vector of the adaptive filter is updated by the probability of the speech *** performance measure of acoustic feedback cancellation is evaluated using normalized *** results demonstrate that the proposed approach has better performance than the normalized least mean square(NLMS) and the constant step-size affine projection algorithms.

关键词：仿射投影算法自适应反馈可变步长概率球性自适应滤波器性能测量权重矢量

Triangulated Cylinder Origami-Based Piezoelectric/Triboelectric Hybrid Generator to Harvest Coupled Axial and Rotational Motion

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Research 2021年第1期2021卷 460-468页

作者： Jihoon Chung Myunghwan Song Seh-Hoon Chung Woojin Choi Sanghyun lee Zong-Hong Lin Jinkee Hong sangmin lee School of Mechanical Engineering Chung-Ang University84Heukseok-roDongjak-guSeoulRepublic of Korea Department of Chemical&Biomolecular Engineering College of EngineeringYonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Institute of Biomedical Engineering and Department of Power Mechanical Engineering National Tsing Hua University101Section 2Kuang-Fu RoadHsinchu 30013Taiwan

Piezoelectric nanogenerators(PENGs)and triboelectric nanogenerators(TENGs)are representative technologies that can harvest mechanical *** general,piezoelectric/triboelectric hybrid generators can harvest considerable energy with a limited input;however,PENGs and TENGs entail different requirements for harvesting ***,PENGs produce a large output when a large mechanical strain is applied,and TENGs require a large surface area to produce a high ***,it is necessary to develop an innovative strategy in terms of the structural design to satisfy the requirements of both PENGs and *** this study,we developed a triangulated cylinder origami-based piezoelectric/triboelectric hybrid generator(TCOHG)with an origami structure to enable effective energy *** proposed structure consists of a vertical contactseparation TENG on the surface of the triangulated cylinder,PENG on the inner hinge,and rotational TENG on the top substrate to harvest mechanical energy from each *** generator could produce a separate electrical output with a single *** TCO-HG could charge a 22μF commercial capacitor and power 60 LEDs when operated.

关键词： harvesting cylinder generator

Energy harvesting model of moving water inside a tubular system and its application of a stick-type compact triboelectric nanogenerator

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Nano Research 2015年第8期8卷 2481-2491页

作者： Dongwhi Choi sangmin lee Sang Min Park Handong Cho Woonbong Hwang Dong Sung Kim Department of Mechanical Engineering Pohang University of Science and Technology (POSTECH) 77 Cheongam-ro Pohang Gyeongbuk 790-784 Republic of Korea School of Mechanical Engineering Chung-Ang University 84 Heukseok-ro Dongjak-gu Seoul 156-756 Republic of Korea

作为第一发明联系充电高效地由使用从周围的机械精力收获电，因为它的划算和可持续性，摩擦电 nanogenerator 得到了世界范围的注意。这研究利用一个 superhydrophobic nanostructured 铝试管在一个管状的系统内为稳固水的接触充电估计... 详细信息

作为第一发明联系充电高效地由使用从周围的机械精力收获电，因为它的划算和可持续性，摩擦电 nanogenerator 得到了世界范围的注意。这研究利用一个 superhydrophobic nanostructured 铝试管在一个管状的系统内为稳固水的接触充电估计电的输出。到水的分开的速度的电线走火电流和开电路的电压的线性地比例的关系被使用收获模型和试验的一个理论精力决定。一种开创的棍子类型稳固水的交往摩擦电 nanogenerator，叫了一根秋千棍子，被开发通过当设备手工被摇时，产生的稳固水的接触充电收获机械精力。水的各种各样的类型从环境产生的电的产量也被测量作为紧缩的摩擦电 nanogenerator 表明 SWING 棍子的概念。几根秋千棍子被连接作为直接力量的便携式、紧缩的来源显示出设备的可行性。收获模型和 SWING 棍子的发达精力能提供一个指南让设计参数达到需要的电的产量；因此，这研究能显著地增加水驱动的摩擦电 nanogenerator 的适用性。

关键词：收获模型系统输出能量收集发电机摩擦电固体水紧凑型纳米

Capillary grip-induced stick-slip motion

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Nano Research 2022年第8期15卷 7384-7391页

作者： sangmin An Manhee lee Bongsu Kim Wonho Jhe Department of Physics&Astronomy Seoul National UniversitySeoul 08826Republic of Korea Department of Physics Institute of Photonics and Information TechnologyJeonbuk National UniversityJeonju 54896Republic of Korea Department of Physics Chungbuk National UniversityCheongjuChungbuk 28644Republic of Korea Samsung Advanced Institute of Technology(SAIT) Samsung ElectronicsSuwon 16678Republic of Korea

We present capillary grip-induced stick-slip motion,a nanoscale tribological effect,where the role of a nanoscale confined water meniscus formed between a buckled sharp tip and a glass or mica surface is addressed by shear dynamic force *** obtained the effective elasticity,viscosity,conservative(elastic)and non-conservative(viscous)forces,energy dissipation,and lateral force using small oscillation,amplitude-modulation,and shear-mode quartz tuning fork-atomic force microscopy(QTFAFM).We distinguished the conservative and non-conservative forces by investigating the dependence of normal load and relative humidity,slip length,and stick-slip *** found that the confined nanoscale water enhances the lateral forces via capillary grip-induced stick-slip on a rough surface,resulting in an increase of static lateral force(3-fold for both substrates)and kinetic lateral force(6-fold for glass,3-fold for mica).This work provides quantitative and systematic understanding of nanoscale tribology properties in humid ambient conditions and is thus useful for control of friction as well as characterization of tribology in nanomaterials and nanodevices.

关键词： dynamic force measurement nanoscale water meniscus relative humidity lateral force stick-slip motion

遗迹化石Rosselia的分类学和古环境学意义:以南悉尼盆地二叠纪遗迹为例（英文）

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遗迹化石Rosselia的分类学和古环境学意义:以南悉尼盆地二叠纪遗...

Design and Guideline Rules for the Performance Improvement of Vertically Integrated Nanogenerator

中国古生物学会第十二次全国会员代表大会暨第29届学术年...

作者：罗茂石光荣 sangmin lee 杨波 Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences School of Life and Environmental Sciences Deakin UniversityGeelongBurwood Campus

Rosselia is a funnel to spindle-shaped trace fossil oriented vertical to bedding *** to its distinctive morphology and long stratigraphical range in the geological past,this ichnogenus has aroused many interests among ichnologists for studying its palaeoecology and palaeoenvironmental significance,with the main focus of research on the type ichnospecies Rosselia socialis Dahmer,*** recently established species such as *** McCarthy 1979,*** Howard and Frey,1984,and *** Bann 1998 have also been studied in terms of their morphology and palaeoenvironmental ***,little attention has been paid to the systematic ichnology regarding the relationship between those ichnospecies among Rosselia,in order to better understand the taxonomic and palaeoecologic aspect of *** aim of this study is to revise the systematic taxonomy of Rosselia based on new trace fossils from the Permian Sydney Basin,where abundant well-preserved Rosselia occur in shallow marine siliciclastic *** palaeoecology and paleoenvironmental significance of each valid ichnospecies were also discussed.

关键词： Rosselia trace fossil taxonomy palaeoecology Permian Southern Sydney Basin

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Journal of Energy and Power Engineering 2013年第9期7卷 1816-1820页

作者： Ronan Hinchet sangmin lee Gustavo Ardila Laurent Montes Mireille Mouis Zhong Lin Wang Institut de Microelectronique Electromagnetisme et Photonique-Laboratoire d'Hyperfrdquences et de CaractOrisation(IMEP-LAHC) MINATEC Grenoble38016 France School of Materials Science and Engineering Georgia lnstitute of Technology Atlanta 30332-0245 Georgia United States

Piezoelectric nanowires have attracted much scientific interest in the last few years because of their enhanced piezoelectric coefficients at nanometer scale, with promises of efficient mechanical energy harvesters for autonomous integrated systems. This paper presents the design and, for the first time, guideline rules, based on simple analytical expressions, to improve the performance of a mechanical energy harvester integrating vertical ZnO piezoelectric nanowires. Additional simulations were carried out to account more realistically for device geometry. The authors discuss the prospects of such an approach, based on design and material improvement.

关键词：改进设计集成系统纳米线性能垂直发电机压电系数解析表达式