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Estimation of Corner Diffracted Currents Using Matrix Pencil Method

Estimation of Corner Diffracted Currents Using Matrix Pencil...

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2008 IEEE Antennas and Propagation Society International Symposium (APSURSI 2008), vol.5

作者： Alper K. Ozturk Robert Paknys Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

ISBN: (纸本)9781424420414

We consider the current density induced on a perfectly conducting rectangular plate illuminated by a plane wave to investigate the behavior of corner diffracted currents. The exact solution for the problem of scattering from a perfectly conducting plane angular sector was first derived by Satterwhite [1]. This solution is in the form of a slowly convergent eigenfunction expansion and not well-suited for asymptotic evaluation. In high frequency modeling of structures for which diffraction coefficients are not available, a customary approach is to formulate numerical diffraction coefficients. In this paper, numerical diffraction coefficients for currents due to a right angled corner are derived. The total current density near the tip of a plane angular sector is expressed as the sum of Physical Optics (PO) current, the edge diffracted currents and the corner current. The current caused by the corner can be estimated by subtracting the physical optics current and the edge diffracted currents from the total current. The total current density is computed using the Moment Method (MM). This approach was previously used by Hansen [2] to derive diffraction coefficients for the edge waves excited at the tip of a quarter plane. These diffraction coefficients are valid for a limited angular region of forward scattering directions for which higher order edge diffractions are negligible. The current near the corner is dominated by higher order edge to edge interactions for a wide range of scattering directions. To circumvent this problem, we use the second order edge diffracted currents [3] in addition to the first order fringe currents and the PO current to calculate the difference current. In order to obtain an accurate representation of the current due to one corner, it is also necessary to eliminate the contributions from the three extraneous corners. To accomplish this, the difference current is expressed as the sum of complex exponential functions and the Matrix Pencil Meth

关键词： currents corners ocean currents water currents Edge waves Current density electric current Edge of a figure or solid total current diffraction terminal interface processor pencil

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A 1μm Diameter Tip Fiber-based Surface Plasmon Resonance System for Single Unit Optical Neural Recording

A 1μm Diameter Tip Fiber-based Surface Plasmon Resonance Sy...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： Hyowon Moon Shin Ae Kim Sang Beom Jun Jesun Lee Uhtaek Oh Sung June Kim School of Electrical Engineering and Computer Science Seoul National University Division of Electronics Engineering Ewha Womans University Collage of Pharmacy Seoul National University

ISBN: (纸本)9781424441211

A gold-deposited optical fiber sensor system based on surface plasmon resonance (SPR) was developed for optical measurement of neuronal activity. To enhance the sensitivity of localized SPR and to make a precise and safe contact with the cellular membrane, we designed a tapered optical probe of 1μm diameter at the tip of the fiber. By wet etching and gold evaporating processes, pencil-shaped optical probes were successfully fabricated. The SPR system with the sharp optical probe was integrated with a conventional patch clamping system to realize a simultaneous optical and electrical recording on a single neuron. Although the shape of optical signal is not clear due to tiny change of intrinsic optical properties on the neuron, optical and electrical signals were simultaneously changed by capsaicin stimulation. Furthermore, our designed fiber probe can be applicable to localized optical stimulation as well as in vivo optical neuroprosthetic devices.

关键词： fiber-optic probe terminal interface processor Optical variables measurement Cell Membrane Wet etching Surface Plasmon Resonance optical signals Optical properties Strategic petroleum reserve optical single unit Sensor systems electrical signal

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Force control on antagonistic Twist-drive Actuator robot

Force control on antagonistic Twist-drive Actuator robot

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Takahiro Inoue Ryuichi Miyata Shinichi Hirai Faculty of Dept. Computer Science and System Engineering Okayama Prefectural Univ. Japan Graduate School of Computer Science and System Engineering Okayama Prefectural Univ. Japan Faculty of Dept. Robotics Ritsumeikan Univ. Japan

ISBN: (纸本)9781509037636

In recent researches relating to robotic fingers, a novel power transmission mechanism had been designed, and developed as Twist-drive Actuators or Twisted String Actuator systems (TSA). These actuation structures, state of the art, include compact designs, light-weight mechanical structures, inherent compliance, and variable gearing, resulting in the fabrication of anthropomorphic robotic hands. However, those studies mentioned position control of the joint, and focused on the control performance of the pulling forces of a twisted string. This paper, therefore, introduces a novel joint mechanism composed of an Antagonistically-twisted Round-belt Actuator (ARA), which is able to make rotating motion by means of contraction forces induced by twisting small-diameter elastic round-belts. A noteworthy point in this paper is that the ARA robot is extremely well-suited for contact force control, which is exerted on the tip of the single joint robot. First, we demonstrate the existence of hysteresis characteristics of static contraction forces induced by the round-belt twisting, in which three belts are simultaneously twisted at constant low-speed. In addition, there exists a stress relaxation phenomenon when strongly twisting the elastic round-belts. We reveal that such sorts of discontinuous and nonlinear properties do not influence control performance in either the contraction force on the belts or contact force on the tip of the robot. Finally, this paper clearly shows stable and accurate tracking performance of the contact force of the ARA robot. In these experiments, we newly develop a twin/triple-twisted round-belt structure for the agonist side actuator, thus enhancing the contact forces effectively.

关键词： CONTACT FORCE control performance Force control actuators Robot belts rotating motion terminal interface processor FOXC1 gene relaxation phenomenon Twisting visual tracking torsion Force Position control

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Two-dimensional simulation of the negative streamer in N₂ between parallel-plate electrodes

Two-dimensional simulation of the negative streamer in N<sub...

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Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

作者： Zheng Dian-chun Zhu Shi-hua Zhang Zhong-lin Lv Shu-ming Harbin Univ Sci & Technol Key Lab Engn Dielect & Its Applicat Minist Educ Harbin 150040 Peoples R China

ISBN: (纸本)9781457709869

With the purpose of deeply understanding behavior of streamer discharge in nitrogen-dielectric, the two-dimensional and self-consistent fluid model of the gas discharge was established based on the electron and ion continuity equations coupled to Poisson's equation. The plasma channel of the negative streamer discharge is studied in this paper by numerical simulation. A program based on the finite element method in its full two-dimension form is developed and employed for the solution of continuity equations of charged particles under the effect of space-charge electric field. Results of two-dimensional simulation of cylindrically symmetric streamer in pure N-2 between parallel-plate electrodes are presented. The formation and propagation of negative streamer in numerically was observed. The space electric field distribution, space ions distribution and drift velocity were predicted by the model. The influence of initial conditions and applied voltages on the streamer characteristic was also investigated. The results show that the space electric field and electrons and ions density at the tip of the streamer increase with the propagation of negative streamer. The space electrons density and electric field at the tip of streamer increase, when the ionization density in the initial increase. The propagation velocity and other characteristics of the streamer are influenced by the diameter of the initial charge distribution. For negative streamer, the ionization density and electron density gradient and electric field at the tip increase with increasing applied field.

关键词： negative electrodes deeply STREAMERS PLATE ELECTRODES Streamer discharge Electric fields Negative gas discharges Ions propagation velocity terminal interface processor Electrons

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Feature referenced tip localization enhanced by probability motion model for AFM based nanomanipulations

Feature referenced tip localization enhanced by probability ...

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IEEE International Conference on Robotics and Biomimetics

作者： Shuai Yuan Lianqing Liu Zhidong Wang Ning Xi Yuechao Wang Zaili Dong Zhiyu Wang Zhibo Wang College of Information & Control Engineering of Shenyang Jianzhu University State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Department of Advanced Robotics Chiba Institute of Technology Department of Electrical and Computer Engineering Michigan State University

ISBN: (纸本)9781457721366

The spatial uncertainties of tip positioning due to the nonlinearity of the PZT scanner and thermal drift hinder the further application of the AFM based nanomanipulation. This paper brings forward feature referenced tip localization enhanced by probability motion model to reduce the spatial uncertainties. An improved motion model is probabilistically built by incorporating the PI model, the creep model and the thermal drift model. For calibrating the accurate model parameters, the statistical experiments are designed and performed. Then the tip position is optimally estimated by combining with a local scan based feature sensing method. The simulation and corresponding experiments are performed to illustrate the validity and feasibility of the calibrated parameters and the algorithm.

关键词： Atomic Force Microscopy terminal interface processor nonlinearity based model parameters Drift models

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Stiffness Ellipse Control of Tendon Mechanisms with Nonlinear Spring

Stiffness Ellipse Control of Tendon Mechanisms with Nonlinea...

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IEEE International Conference on Robotics and Biomimetics

作者： Hiroyasu Kashiwagi Fumihiro Okumura Satoshi Komada Junji Hirai Faculty of Electric Electronic Engineering Mie University

ISBN: (纸本)9781457721366

Versatility and safety are required for manipulators used in human environments. Tendon mechanisms with nonlinear springs that can mechanically adjust joint stiffness is one candidate for the requirement. This paper proposes a stiffness ellipse control method of both mechanical and control stiffness at tip of the manipulator called hybrid stiffness control. A conventional controller for the manipulator can adjust mechanical joint stiffness. This paper shows a transformation from stiffness ellipse at the tip to joint stiffness. The transformation is applied to both mechanical joint stiffness and controller gain of joint angle controller. Simulation results shown validity of the proposed method.

关键词： Manipulators Joint Stiffness stiffness Ellipse terminal interface processor controller gain COUPLING(MECHANICAL) Tendon springs Device Spring

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Development of Multifunctional Robot Hand for Visual Inspection Equipped with 3D Force Sensing

Development of Multifunctional Robot Hand for Visual Inspect...

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International Symposium on Micro-NanoMechatronics and Human Science

作者： Ryo Akiyama Kazuto Kamiyama Masaru Kojima Mitsuhiro Horade Yasushi Mae Tatsuo Arai Graduate School of Engineering Science Osaka University

ISBN: (纸本)9781467382182

In this paper, we design a robot hand for visual inspection equipped with 3D force sensing. The designed hand is attached to the tip of legs of multi-legged robot ASTERISK. The reason for the robot hand to be equipped to the tip of ASTERISK is that it could meet following four requirements. Firstly, the hand system can catch a 1cm size object such as bolts and wires. Secondly, a small camera is attached inside the hand for visual inspection. Thirdly, when moving, the hand will close and become regular tip of leg. Lastly, the hand can equip 3D force sensing ability.

关键词： Visual inspection Hand robotic hand terminal interface processor Robot Leg Bolt Force

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Advancing the State-of-the-Art in Hardware Trojans Design

Advancing the State-of-the-Art in Hardware Trojans Design

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IEEE Pulsed Power Conference

作者： Syed Kamran Haider Chenglu Jin Marten van Dijk Department of Electrical and Computer Engineering University of Connecticut

ISBN: (纸本)9781509063901

Electronic Design Automation (EDA) industry heavily reuses third party IP cores which are vulnerable to insertion of Hardware Trojans (HTs) at design time by third party IP core providers. State of the art research has shown that existing HT detection techniques, which claim to detect all publicly available HT benchmarks, can still be defeated by carefully designing new sophisticated HTs. The reason being that these techniques consider the HT landscape to be limited only to the publicly known HT benchmarks. However the adversary is not limited to these HTs and may devise new HT design principles to bypass these countermeasures. In this paper, we discover certain crucial properties of trigger activated HTs which lead to the definition of an exponentially large class of Deterministic Hardware Trojans H_D that an adversary can (but is not limited to) design. The discovered properties serve as HT design principles which help us understand the tremendous ways available to an adversary to design a HT, and show that the existing publicly known HT benchmarks are just the tip of the iceberg on this huge landscape.

关键词： Computer hardware Arts BENCHMARKS design year electronic design automation design theory icebergs Third party high-temperature superconductors EIS IMPLEMENTATION PLANS state of the art Vulnerable terminal interface processor

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A NOVEL WAY TO CHARACTERIZE METAL-INSULATOR-METAL DEVICES VIA NANOINDENTATION

A NOVEL WAY TO CHARACTERIZE METAL-INSULATOR-METAL DEVICES VI...

引用

IEEE Photovoltaic Specialists Conference

作者： Prakash Periasamy Ryan P. O'Hayre Joseph J. Berry Philip A. Parilla David S. Ginley Corinne E. Packard Department of Metallurgical and Materials Engineering Colorado School of Mines National Renewable Energy Laboratory

ISBN: (纸本)9781424499663

Metal-Insulator-Metal (MIM) devices are crucial components for applications ranging from optical rectennas for harvesting sunlight to infrared detectors. To date, the relationship between materials properties and device performance in MIM devices is not fully understood, partly due to the difficulty in making and reproducing reliable devices. One configuration that is popular due to its simplicity and ease of fabrication is the point-contact diode where a metal tip serves as one of the metals in the MIM device. The intrinsic advantage of the point-contact configuration is that it is possible to achieve very small contact areas for the device thereby allowing very high-frequency operation. In this study, precise control over the contact area and penetration depth of an electrically conductive tip into a metal/insulator combination is achieved using a nanoindenter with in-situ electrical contact resistance measurement capabilities. A diamond probe tip, doped (degeneratively) with boron for conductivity, serves as the point contact and second 'metal' (b-Diamond) of the MIM diode. The base layer consists of Nb/Nb_2O_5 thin films on Si substrates and serves as the first metal/insulator combination of the MIM structure. The current-voltage response of the diodes is measured under a range of conditions to assess the validity and repeatability of the technique. Additionally, we compare the results of this technique to those acquired using a bent-wire approach and find that Nb/Nb_2O_5/b-Diamond MIM devices show an excellent asymmetry (60-300) and nonlinearity values (～6-9. This technique shows great promise for screening metal-insulator combinations for performance without the uncertainty that stems from a typical bent-wire point-contact.

关键词： metal-insulator-metal devices CONTACT AREA Nanoindentation point-contact diode Point contacts BASE COURSE INFRARED DETECTORS Metals Crucial components Material properties terminal interface processor Electrically conductive

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Reducing Atomic Force Microscope Tip Deflection using Command Shaping

Reducing Atomic Force Microscope Tip Deflection using Comman...

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40th Southeastern Symposium on System Theory (SSST 2008)

作者： Allan H. Elsberry Michael J. Robertson Weapons & systems Engineering Department United states Naval Academy Annapolis MD USA

ISBN: (纸本)9781424418060

Dynamic atomic force microscopy (AFM) is a popular scanning method that utilizes an oscillating cantilever tip to interact with and develop high resolution images of surfaces. Though this method is one of the most versatile in AFM, it is dependent upon maintaining constant oscillation amplitude. Constant oscillation amplitude can be difficult to achieve when probe movement is necessary to maintain an appropriate tip to sample distance. This paper documents the effectiveness of command shaping techniques in reducing the probe's tip deflection during the scanning process. Command shapers are used to modify the movements of the scanning probe base in response to changes in the sample's surface. Reducing tip deflection and tip tracking error improve the quality of the scanned image while reducing the likelihood of damage to the sample or the probe.

关键词： Atomic Force Microscopy Deflection terminal interface processor scanned imagery commands Probes Amplitude High resolution imaging Surfaces image resolution

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