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separation of closely spaced modes by combining complex envelope displacement analysis with method of generating intrinsic mode functions through filtering algorithm based on wavelet packet decomposition

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Applied Mathematics and Mechanics(English Edition) 2013年第7期34卷 801-810页

作者： y.s.kim 陈立群 shanghai Institute of Applied Mathematics and Mechanics Department of Mechanics Kim Ⅱ Sung University Department of Mechanics College of Sciences Shanghai University shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University

One of the important issues in the system identification and the spectrum analysis is the frequency resolution, i.e., the capability of distinguishing between two or more closely spaced frequency components. In the modal identification by the empirical mode decomposition （EMD） method, because of the separating capability of the method, it is still a challenge to consistently and reliably identify the parameters of structures of which modes are not well separated. A new method is introduced to generate the intrin- sic mode functions （IMFs） through the filtering algorithm based on the wavelet packet decomposition （GIFWPD）. In this paper, it is demonstrated that the CIFWPD method alone has a good capability of separating close modes, even under the severe condition beyond the critical frequency ratio limit which makes it impossible to separate two closely spaced harmonics by the EMD method. However, the GIFWPD-only based method is impelled to use a very fine sampling frequency with consequent prohibitive computational costs. Therefore, in order to decrease the computational load by reducing the amount of samples and improve the effectiveness of separation by increasing the frequency ratio, the present paper uses a combination of the complex envelope displacement analysis （CEDA） and the GIFWPD method. For the validation, two examples from the previous works are taken to show the results obtained by the GIFWPD-only based method and by combining the CEDA with the GIFWPD method.

关键词： empirical mode decomposition (EMD) wavelet packet decomposition com- plex envelope displacement analysis (CEDA) closely spaced modes modal identification

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Effects of Weaving Laser on Weld Microstructure and Crack for Al 6k21-T4 Alloy

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Journal of Materials science & Technology 2011年第1期27卷 93-96页

作者： B.H.kim N.H.Kang W.T.Oh C.H.kim J.H.kim y.s.kim y.H.Park Department of Materials science and Engineering Pusan National UniversitySan30Jangjeon-dongGeumjeong-guBusan 609-735Korea Department of Materials and Components Engineering Dong-Eui UniversityBusan 614-714Korea Advanced Joining Technology Team KITECH7-47Songdo-dongYeonsu-guIncheon 406-840Korea Division for Dongnam Area Technology service KITECHJisa-dongGanseo-guBusan 618-230Korea

For Al 6k21-T4 overlap weld joint,the shear-tensile strength by using the weaving laser was improved as compared to the case of linear *** the specimen of low strength,the porosity was distributed continuously along the intersection between the plates and fusion ***,for the optimized welding condition,large oval-shaped porosities were located only in the advancing track of the concave ***,the continuity of cracks and porosities played a key role to determine the ***,the weaving width was also the important parameter to control the ***,the concave part had more significant hot and cold cracking in the weld and heat-affected zone（HAZ）,respectively,than the convex part.

关键词： Weaving laser Weld microstructure Void Al alloy

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P13 from group Ⅱ baculoviruses is a killing-associated gene

P13 from group Ⅱ baculoviruses is a killing-associated gene

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2006年度学术研讨会

作者： y.s.kim state Key Laboratory of Virology College of life science kim IL sUNG University DaesungPyongyangD.P.R.K

Baculovirus p13 gene was described several years ago, but its function still remained unknown to date. Luciferase assays indicated that p13 was regulated by early and late promoter, which activity was increased more t...

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Function and oligomerization study of a leucine zipper-like domain in Leucania separata multiple nuclear polyhederosis virus p13

Function and oligomerization study of a leucine zipper-like ...

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2006年度学术研讨会

作者： y.s.kim College of Life science kim IL sUNG University Daesung Pyong yang D.P.R.Korea

P13 are a kind of genes which specifically present in Group Ⅱ nucleopolyhedroviruses (NPVs) and in some granuloviruses, but not in Group Ⅰ NPVs. When p13 was inserted into Autographa californica nucleopolyhedrovirus (AcMNPV), one of Group I NPVs, the polyhedron product of AcMNPV has been inhibited. However, the inhibition effect was lost

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single-phase Active Power Filter based on Rotating Reference Frame Method

Single-phase Active Power Filter based on Rotating Reference...

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2005国际电机与系统学术会议

作者： y.J.kim J.s.kim y.s.kim Department of Computer Aided Control Yuhan CollegeBucheon 185-34Korea Deptment.of Electrical Engineering Inha UniversityInchon 402-751Korea Deptment.of Electrical Engineering Inha UniversityInchon 402-751Korea

＜正＞ This paper presents a new control method of the single-phase active power filter （APF） for the compensation of harmonic current components in nonlinear loads. In order to use a new transformation theory, the two-phase system by constructing a imaginary second-phase is formed. In the conventional method, an imaginary-phase lagged to the load current T/4（here T is the fundamental cycle） is made. But in this proposed method, the new signal as the second phase is the delayed through the filter. As this control method is applied to the system of single-phase, an instantaneous calculation was developed rather by using the rotating reference frames synchronized with source-frequency than by applying instantaneous reactive power theory that uses the conventional fixed reference *** control scheme of single-phase APF is analyzed with the experimental results in a laboratory prototype to verify the validities of the proposed control methods.

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Fast reconstruction of digital holograms for extended depths of field

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Chinese Optics Letters 2016年第7期14卷 34-37页

作者： P.W.M.Tsang T.-C.Poon T.kim y.s.kim Department of Electronic Engineering City University of Hong Kong Bradley Department of Electrical and Computer Engineering Virginia Tech Dept of Optical Engineering Sejong University

Past research has demonstrated that a static, three-dimensional （3D） object scene can be directly recorded as a complex digital hologram. However, numerical reconstruction of the object scene, which may comprise multiple sections located at unknown distances from the hologram, is a complicated and computation-intensive process. To the best of our knowledge, we propose, for the first time, a low complexity method that is capable of recon- structing a complex hologram, such that sections at different depths in the 3D object scene can be automatically reconstructed at the correct focal distances and merged into a single image for an extended depth of field. We demonstrate an order of magnitude increase of the depth of field for binary objects. With the use of a graphical processing unit, the reconstruction of a 512 × 512 complex hologram can be accomplished in about 100 ms, equivalent to around 10 frames per second.

关键词： Lithography

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寻的导弹的一种新制导律

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系统工程与电子技术 1986年第8期 49-52页

作者： y.s.kim 王永平白珊

本文提出了寻的导弹的一种新型制导律。这个设计概念基于使寻的时间最短。业已表明,为了实现这种制导概念必须有预测拦截路线的算法和使导弹航向转到所预测的拦截路线方向上的制导命令产生器。本文推导了预测拦截路线的算法并且证明整... 详细信息

本文提出了寻的导弹的一种新型制导律。这个设计概念基于使寻的时间最短。业已表明,为了实现这种制导概念必须有预测拦截路线的算法和使导弹航向转到所预测的拦截路线方向上的制导命令产生器。本文推导了预测拦截路线的算法并且证明整个制导律是容易实现的。仿真结果证明了最短的寻的时间性能和加宽的发射包迹。

关键词：制导律导弹系统仿真结果时间性能路线方向机动目标瞄准线导弹制导脱靶距离目标机动

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基于动态增强MRI评估偏头痛相关脑区的血管通透性改变

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国际医学放射学杂志 2019年第6期 731-732页

作者： y.s.kim M.kim s.H.Choi s.H.you R.E.yoo K.M.Kang 胡斌 Department of Radiology Seoul National University Hospital

摘要最近的研究表明慢性疼痛与炎症诱导的血脑屏障(BBB)结构变化所引起的渗透性增加之间可能存在关联。因此,对BBB损伤的检测将对偏头痛的诊断具有辅助价值。动

关键词：动态增强偏头痛 MRI

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生姜的抗氧化性能及其在肉制品中的应用

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食品工业科技 1987年第6期 52-54页

作者： y·B·Lee ,y.s.kim ,G·R·Ashmore ,侯晓莉

肉制品变质的多数原因是氧化酸败,而这项课题最近已被广泛地研究。肌肉的氧化变性是由于血红蛋白和非血红素铁催化使之不饱和脂肪酸氧化造成的。因此,通过使用合成的或天然的抗氧化剂来阻止食物的酸败产生。自从禁止在许多肉制品中使用... 详细信息

肉制品变质的多数原因是氧化酸败,而这项课题最近已被广泛地研究。肌肉的氧化变性是由于血红蛋白和非血红素铁催化使之不饱和脂肪酸氧化造成的。因此,通过使用合成的或天然的抗氧化剂来阻止食物的酸败产生。自从禁止在许多肉制品中使用合成的抗氧化剂以来,已对各种植物及调味香料中提取物的抗氧化作用进行了研究。生姜是东方国家烹

关键词：姜汁生姜抗氧化性能肉制品食品抗氧化能力抗氧化剂脂类氧化 TBA 试验样品

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联合应用钆对比剂增强扫描和MR扩散加权成像技术可增加对小肝癌的诊断敏感性

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国际医学放射学杂志 2012年第6期 578-579页

作者： M.J.Park y.K.kim M.W.Lee W.J.Lee y.s.kim s.H.kim 刘静郭琪译 Department of Radiology and Center for Imaging science Samsung Medical CenterSungkyunkwan University School of Medicine50 Irwon-dongGangnam-guSeoul 135-710Republic of Korea

摘要目的比较联合应用钆对比剂增强扫描与MR扩散加权成像(DWI)技术与单独应用两种扫描技术是否可增加小肝癌诊断的准确性与敏感性。材料与方法伦理委员会批准了该项回顾性研究并确定无需进行知情同意的确认

关键词：对比剂增强联合应用加权成像 MR DWI 小肝癌

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