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A Generic Object Detection Using a Single Query Image Without Training

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Tsinghua Science and Technology 2012年第2期17卷 194-201页

作者： bin xiong Xiaoqing Ding State Key Laboratory of Intelligent Technology and Systems Tsinghua National Laboratory for Information Science and TechnologyDepartment of Electronic EngineeringTsinghua UniversityBeijing 100084China

A method was developed to detect generic objects using a single query image. The query image could be a typical real image, a virtual image, or even a hand-drawn sketch of the object. Without a training process, the key problem is how to describe the object class from only one query image with no pre-segmentation or other pre-processing procedures. The method introduces densely computed Scale-lnvariant Feature Transform （SIFT） as the descriptor to extract ＂gradient distribution＂ features of the image. The descriptor emphasizes the edge parts and their distribution structures, which are very representative of the object class, so it is very robust and can deal with virtual images or hand-drawn sketches. Tests on car detection, face detection, and generic object detection demonstrate that the method is effective, robust, and widely applicable. The results using queries of real images compare well with other training-free methods and state-of-the-art training-based methods.

关键词： object detection densely computed SIFT training free single query image

Status and prospect of 3D inversions in EM geophysics

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Science China Earth Sciences 2020年第3期63卷 452-455页

作者： Changchun YIN Yunhe LIU bin xiong College of Geo-Exploration Science and Technology Jilin UniversityChangchun 130026China College ofEarth Sciences Guilin University of TechnologyGuilin 541004China

*** status Three-dimensional(3D)inversion of geophysical EM data is generally underdetermined,non-linear,and of large-scale that is very difficult to solve by *** the past two decades,with the advancement of computational equipment and numerical algorithms,3D geophysical EM inversion has made great *** inversion codes and platforms based on the regularizations have been successfully developed and are being widely used in the industry and scientific *** development of 3D EM inversions mainly involve the following aspects.

关键词： geophysical optimization. inversion

Inverse Spline Interpolation for All-time Resistivity of Central-Loop TEM

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Journal of China University of Mining and Technology 2005年第3期15卷 172-176页

作者： xiong bin MAO Ya-dan School of lnfo-Physics ＆ Geomatics Engineering Central South University Changsha Hunan 410083 China Institute of Geophysics ＆ Geomatics China University of Geosciences Wuhan Hubei 430074 China

A convenient numerical calculation method (inverse spline interpolation) for all-time apparent resistivity intransient electromagnetic method (TEM) is proposed in this paper. Characteristic of early and late normalized inductiveelectromotive force was investigated. According to the turning point, the transient process is divided into the earlyphase, the turning point, and the late phase. Afterwards, apparent resistivity is obtained through inverse spline interpo-lation in the early and the late phases, respectively. Finally, the resistivities of the early-time and the late-time wereconnected together by the turning point. The result shows that the inverse spline method is feasible and the method alsolays a foundation for initial model construction in the TEM automatic inversion.

关键词： transient electromagnetic method all-time apparent resistivity inverse spline interpolation

MEMS-based thermoelectric infrared sensors： A review

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Frontiers of Mechanical Engineering 2017年第4期12卷 557-566页

作者： Dehui XU Yuelin WANG bin xiong Tie LI Science and Technology on Microsystem Laboratory Shanghai Instituteof Microsystem and Information Technology CAS Shanghai 200050China

In the past decade, micro-electromechanical systems （MEMS）-based thermoelectric infrared （IR） sensors have received considerable attention because of the advances in micromachining technology. This paper presents a review of MEMS-based thermoelectric IR sensors. The first part describes the physics of the device and discusses the figures of merit. The second part discusses the sensing materials, thermal isolation micro- structures, absorber designs, and packaging methods for these sensors and provides examples. Moreover, the status of sensor implementation technology is examined from a historical perspective by presenting findings from the early years to the most recent findings.

关键词： thermoelectric infrared sensor CMOS-MEMS thermopile micromachining wafer-level package

Real-time observation of dynamic heterogeneity of gold nanorods on plasma membrane with darkfield microscopy

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Science China Chemistry 2019年第8期62卷 1072-1081页

作者： Feng Ge Jianfeng Xue Zonghua Wang bin xiong Yan He Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China Department of Chemistry Tsinghua UniversityBeijing 100084China State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringCollege of Biology Hunan UniversityChangsha 410082China

The plasma membrane possesses a complicated structure, on which the protein clusters are randomly but orderly distributed to maintain the regular morphology and function of cells. Investigating the detailed dynamic behaviors of nanoparticles(NPs) on cytomembrane is of great importance to understand cellular mechanisms and advance the bio-nano technologies for drug delivery, photothermal therapy, immunotherapy, etc. In this work, to study the dynamic heterogeneous interactions between NPs and cell membrane with high resolution, we established a simple method to efficiently track the translational and rotational diffusion of individual gold nanorods(AuNRs) on cell membranes. This method is based on that an anisotropic AuNR appears as a colored spot under a darkfield microscope(DFM) equipped with a color camera. While obtaining its lateral position, the polar angle of the AuNR can be calculated simultaneously from intensity difference between the R and G channels. Careful analysis shows that the lateral motion of single AuNRs do not follow normal Brownian diffusion, which could be attributed to their hop diffusion in the dynamically varying picket-fence structure of the live cell membrane. Furthermore, 4 different rotationtranslation patterns of the AuNR are observed due to spatiotemporal heterogeneity of the cytomembrane. This simple but robust method for simultaneously obtaining the location and orientation of anisotropic plasmonic nanoparticles could be further applied to the analysis of complicated biological and biomedical processes.

关键词： single particle tracking gold nanorods nanoparticle cell interaction darkfield microscopy

Some issues on 2.5-D transient electromagnetic forward

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Journal of Central South University of Technology 2005年第z1期12卷 177-182页

作者： xiong bin MAO Ya-dan School of Info-Physics and Geomatics Engineering Central South University Changsha 410083 China Institute of Geophysics and Geomatics China University of Geosciences Wuhan 430074 China

Numerical calculation for two integral transforms in 2.5-D transient electromagnetic forward is a difficult and key task, namely, the inverse Fourier transform and the inverse Laplace transform. Some effective algorithms for them were described. Based on the known algorithms in DC resistivity on wave-number distribution and selection, we proposed a principle on how to choose the least wave-number concerning the central-loop transient electromagnetic method. First, observe the behavior of transformation function curve with regard to wave-number in Fourier domain. In the light of its asymptote, ascertain the coverage scope of wave-number. Compared with analytic solution, the least wave-number in Fourier domain can be derived. Furthermore, the Laplace numerical inversion algorithm which needs only a few Laplace variables in pure real domain was also introduced here. The procedure was applied to forward modeling on transient electromagnetic field of a vertical magnetic dipole over uniform half-space to demonstrate them effectiveness and general applicability.

关键词： transient electromagnetic method 2.5-D forward modeling inverse fourier transform inverse laplace transform wave-number

Design and simulation of a tuning fork micromachined gyroscope with slide film damping

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光学精密工程 2005年第5期13卷 519-524页

作者： CHE Lu-feng xiong bin JIAO Ji-wei WANG Yue-lin State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

A novel tuning fork micromachined gyroscope, based on slide-film damping, is presented. The electrostatic driving gyroscope consists of two driving masses each of which supports one sensitive mass. The angular rate is sensed by the differential capacitances consisted of movable bar electrodes and fixed bar electrodes located on the glass wafer. The gyroscope can operate at atmospheric pressure with slide film damping in the driving and sensing directions, eliminate vacuum packaging and restrain cross-axis acceleration signal. The results of design and simulation show that the driving and sensing mode frequencies are 3 106 Hz and 3 175 Hz,respectively, and the Q-values in driving and sensitive modes are 1 721 and 1 450 respectively. The design resolution is 0.025°/s.

关键词：等效电路模拟角度传感器微电子力学系统电路等效方程

Study of Local Structural Changes on Air Cooling at the End of Rotor Windings for Variable Speed Pumped Storage Generator-Motor

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Energy Engineering 2022年第6期119卷 2243-2254页

作者： Yanliang Qiu bin xiong Zhe Hou Lin Luo University of Chinese Academy of Sciences Beijing100049China Institute of Electrical Engineering of Chinese Academy of Sciences Beijing100049China Dongfang Electric Machinery Co. Ltd.Deyang618000China

The shrink fit retaining ring is currently the easiest to install and the most widely used end fixed for structure AC excitation variable speed generator-motor rotor end ***,the current research on the effect of high strength sealing on the ventilation and heat dissipation performance of the end is not *** this paper,based on the actual structural parameters and periodic symmetry simplification,the three-dimensional coupled calculation model of fluid field and temperature field is *** solving the fluid and thermal equations,the influence of the length of rotor support block,the height of rotor support block,and the number of rotor support block on the fluid flow and temperature distribution in the rotor end region of generator-motor is studied using the finite volume *** rheological characteristics of the air in the rotor domain,such as velocity and inter-winding flow,are *** law of temperature variation with local structure in the computational domain is *** variation law of cooling medium performance inside the large variable speed power generator motor is revealed.

关键词： Pumped storage plants generator-motor local structural changes rotor windings end

Background-free three-dimensional selective imaging of anisotropic plasmonic nanoparticles

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Nano Research 2017年第4期10卷 1423-1433页

作者： Xiaodong Cheng Xuan Cao bin xiong Yan He Edward S. Yeung State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering College of Biology Hunan University Changsha 410082 China Department of Chemistry Tsinghua University Beijing 100084 China School of Medical Lab Science and Life Science Wenzhou Medical University Wenzhou 325035 China

There is an increasing demand for advanced optical imaging techniques that can detect and resolve nanosize objects at a spatial resolution below the optical diffraction limit, especially in three-dimensional （3D） cellular environments. In this study, using a polarization-activated localization scheme based on the orientation-dependent properties of anisotropic plasmonic metal nanoparticles （MNPs）, ＂photoswitchable＂ imaging of single gold nanorods （AuNRs） was accomplished not only in two dimensions but also in three dimensions. Moreover, the Rayleigh scattering background arising from the congested subcellular structures was efficiently suppressed. Thus, we obtained the 3D distributions of both the position and the orientation of the AuNRs inside the cells and investigated their intemalization kinetics. To our knowledge, this is the first demonstration of the confocal-like 3D imaging of non-fluorescence nanoparticles with a high resolution and almost zero background. This technique is easy to implement and should greatly facilitate MNP studies and applications in biomedicine and biology.

关键词： anisotropic nanopartide localized surface plasmon resonance (LSPR) scattering imaging polarization microscopy orientation-dependent localization microscopy three-dimensional (3D) imaging