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2012

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Articles 61 - 90 of 1374

Full-Text Articles in Electrical and Computer Engineering

Method Of Moments Analysis Of An Aperture In A Thick Ground Plane, Ahmet Burak Olcen Dec 2012

Method Of Moments Analysis Of An Aperture In A Thick Ground Plane, Ahmet Burak Olcen

Electrical Engineering and Computer Science - Dissertations

The problem of electromagnetic scattering from and transmission through an arbitrarily shaped aperture is considered. The aperture is in a thick infinite perfectly conducting ground plane. The conducting walls of the cavity inside the ground plane are of arbitrary shape. The apertures at both ends of the cavity are also of arbitrary shape. The structure is illuminated by an incident plane electromagnetic wave. The Green's function for this complicated problem is almost impossible to determine. Therefore the surface equivalence principle is used to reduce this complex problem into three simpler ones. Each such problem consists of equivalent surface currents radiating …

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Energy Harvesting Of Human Kinetic Movement, David Marusiak, Julia Carrillo Dec 2012

Energy Harvesting Of Human Kinetic Movement, David Marusiak, Julia Carrillo

Electrical Engineering

Development of kinetic energy scavenging applications from the human body necessitates additional research to assist in designating a mounting position for a potential device. A data acquisition system adequately provides a parametric average power comparison among four locations on the body (waist, upper arm, hand, and calf) for both a male and female subject. Experimentally, the hand-held device provided the highest average power. Thus, subsequent investigation at set speeds provides further analysis of the output’s characteristically linear behavior. The physical energy-harvesting device features a plastic tube casing wrapped with the stationary coiled wire through which a neodymium magnet oscillates. While …

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Single-Phase High Efficiency Motor Testing, Marc Henry Perez Dec 2012

Single-Phase High Efficiency Motor Testing, Marc Henry Perez

Electrical Engineering

A three-phase induction motor has higher efficiency than the single-phase motor counterpart. It is possible to run a three-phase motor with a single-phase source to develop a single-phase high efficiency system. The single-phase high efficiency motor, or SHE-motor, uses capacitor banks to operate at a balanced three phase induction motor using a single phase source. Unfortunately, this design has been limited, as it can only be balanced for one load configuration at a time. This provides the system to have maximum system performance. Due to this limitation in operations, it has proven to be non-ideal in commercial applications. It is …

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Efficiency Optimization Of A Sensorless V/F Control Method For Pmsm, Seyed Hesam Jafari, Keith Corzine, Jing Huang Dec 2012

Efficiency Optimization Of A Sensorless V/F Control Method For Pmsm, Seyed Hesam Jafari, Keith Corzine, Jing Huang

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a V/f control for permanent magnet synchronous machines which focuses on optimization by minimizing the d-axis current in order to reduce the motor losses and supplied input power. the proposed sensor less method only needs machine terminal signals and does not require any additional motor parameter measurements. Minimization of the d-axis current is accomplished through computed reactive power. © 2012 IEEE.

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On Linear Precoding Of Non-Regenerative Mimo Relays For Qam Inputs, Xiao Liang, Zhi Ding, Chengshan Xiao Dec 2012

On Linear Precoding Of Non-Regenerative Mimo Relays For Qam Inputs, Xiao Liang, Zhi Ding, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

Recent works have established that MIMO systems optimized for Gaussian source signals may suffer unexpected performance loss when practical inputs are in fact discrete QAM sources. There is a practical need in the optimization of MIMO related systems of various networking scenarios to specifically target source signals of finite QAM alphabet. in this work, we investigate the precoding optimization of wireless two-hop non-regenerative three-node MIMO relay networks driven by finite-alphabet inputs. Exploiting a known optimal structure for the precoder at relay and a special convexity property, we propose an iterative two-step numerical optimization algorithm. This algorithm is a general solution, …

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Wide Area Monitoring Of Rotor Angle Based On Synchrophasor Measurements, P. K. Olulope, Ganesh K. Venayagamoorthy, K. A. Folly Dec 2012

Wide Area Monitoring Of Rotor Angle Based On Synchrophasor Measurements, P. K. Olulope, Ganesh K. Venayagamoorthy, K. A. Folly

Electrical and Computer Engineering Faculty Research & Creative Works

The concept of phasor is designed for steady state and phasor measurement unit (PMU) is based on this concept. Measuring rotor angle therefore during transient has become a challenging task. This paper investigates the possibility of using data from PMU to estimate the internal variables of synchronous generator such as rotor angle of large power system during transient disturbance. the rotor angle is estimated from synchro phasor such as phasor voltage and current as well as their angles. the proposed method is implemented on IEEE 68 bus system. © 2012 IEEE.

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Colorimetric Oxygen Imaging And Quantification With Easily Accessible Optical Devices, Satya Achanta, Sanghan Park, Chang-Soo Kim Dec 2012

Colorimetric Oxygen Imaging And Quantification With Easily Accessible Optical Devices, Satya Achanta, Sanghan Park, Chang-Soo Kim

Electrical and Computer Engineering Faculty Research & Creative Works

Optical oxygen imaging is essential in monitoring two-dimensional analysis of oxygen distribution. Two easily accessible optical devices were used for oxygen analysis to demonstrate the feasibility of an innovatively simple method. a light panel screen with light-emitting diode (LED) backlight was used as a light source to excite a luminophore film responsive to oxygen. Meso-scale fluidic sensor platform was prepared using porphyrin complex (PtOEP) as the luminophore embedded within ethyl cellulose (EC) polymer matrix. Green LED light uniformly displayed from the light panel excited the luminophore film to exhibit two-dimensional luminescence distribution corresponding to wet gaseous oxygen. a color camera …

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On Interference-Aware Precoding For Multi-Antenna Channels With Finite-Alphabet Inputs, Weiliang Zeng, Chengshan Xiao, Jianhua Lu Dec 2012

On Interference-Aware Precoding For Multi-Antenna Channels With Finite-Alphabet Inputs, Weiliang Zeng, Chengshan Xiao, Jianhua Lu

Electrical and Computer Engineering Faculty Research & Creative Works

This paper investigates the interference-aware linear precoder design with finite-alphabet inputs. It maximizes the mutual information between the transmitter and intended receiver while controlling the interference power caused to unintended receivers. for this nonconcave problem, this work proposes a global optimization approach, which is based on two key observations: 1) the interference-aware precoding problem can be reformulated to the problem minimizing a function with bilinear terms over the intersection of multiple co-centered ellipsoids; 2) these bilinear terms can be relaxed by their convex and concave envelopes. in this way, the global optimal solution is obtained by solving a sequence of …

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Single-Carrier Frequency-Domain Turbo Equalization Without Cyclic Prefix Or Zero Padding For Underwater Acoustic Communications, Longbao Wang, Jun Tao, Yahong Rosa Zheng Dec 2012

Single-Carrier Frequency-Domain Turbo Equalization Without Cyclic Prefix Or Zero Padding For Underwater Acoustic Communications, Longbao Wang, Jun Tao, Yahong Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

A frequency-domain turbo equalization (FDTE) scheme without cyclic prefix (CP) or zero padding is proposed for single-carrier, multiple-input-multiple- output underwater acoustic communication. in the first iteration of the FDTE, the received continuous data stream is divided into consecutive blocks and a combined inter-block-interference (IBI) cancellation and overlapped windowing scheme is used to diagonalize each data block for low-complexity detection in the frequency domain. Since the second iteration, IBI cancellation and CP reconstruction are applied on each block to enable effective symbol detection. This work extends the authors previous work on frequency-domain hard-decision equalization to soft-decision turbo equalization so that it …

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Fundamental Components Of The Ic Packaging Electromagnetic Interference (Emi) Analysis, Nick K.H. Huang, Li (Lijun) Jun Jiang, Huichun Yu, Gang Li, Shuai Xu, Huasheng Ren Dec 2012

Fundamental Components Of The Ic Packaging Electromagnetic Interference (Emi) Analysis, Nick K.H. Huang, Li (Lijun) Jun Jiang, Huichun Yu, Gang Li, Shuai Xu, Huasheng Ren

Electrical and Computer Engineering Faculty Research & Creative Works

The IC packaging EMC/SI/PI problems have been broadly attested. But IC packaging EMI was seldom addressed. Because the EMI emission by IC packagings is increasingly significant, in this paper, EMI behaviors are systematically studied. To fundamentally understand the radiation mechanism, radiated contributions from ground lids, vias, and traces of the packaging are investigated and modeled separately. It is seen that the packaging EMI has clearly low frequency and high frequency behaviors. The low frequency behavior is due to the Hertzian dipole effects of vias. The high frequency behavior is due to the radiation of excited cavity modes. Both theoretical analysis …

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Accurate And Efficient Computation Of Power Plane Pair Inductance, Liang Li, Albert E. Ruehli, Jun Fan Dec 2012

Accurate And Efficient Computation Of Power Plane Pair Inductance, Liang Li, Albert E. Ruehli, Jun Fan

Electrical and Computer Engineering Faculty Research & Creative Works

The computation of the power-plane inductance for multiple ports is an important part of the PDN design. in this paper, we present an efficient approach for the inductance computation. Since this PEEC approach is based on partial inductance computations, vias and other discontinuities can accurately be taken into account. Speed-up techniques are employed like the faster decay of the coupling due to the symmetry, sparsification and simplification of the partial mutual inductance evaluation. Also, an approximate rectangular mesh reduction method is introduced which allows a local increase in mesh density. © 2012 IEEE.

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Dual Pn Padding Tds-Ofdm For Underwater Acoustic Communication, Jinxing Hao, Yahong Rosa Zheng, Jintao Wang, Jian Song Dec 2012

Dual Pn Padding Tds-Ofdm For Underwater Acoustic Communication, Jinxing Hao, Yahong Rosa Zheng, Jintao Wang, Jian Song

Electrical and Computer Engineering Faculty Research & Creative Works

A time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) scheme with dual Pseudo noise (PN) sequence is proposed for underwater acoustic (UWA) communication. Instead of using cyclic prefix (CP) or zero padding (ZP) as the guard interval, the proposed TDS-OFDM scheme uses two identical PN sequences as guard interval and utilizes them for frame synchronization and channel estimation. the proposed TDS-OFDM increases the spectrum efficiency over the conventional CP or ZP OFDM systems where additional pilots have to be inserted for channel estimation. with the dual PN at each frame header, compressed sensing channel estimation is adopted, and a rather …

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Active Diesel Soot Measurement By Laser Opacity, Jonathan Audish, Brian Ko, Edward Ma, Travis Mcdaniel Dec 2012

Active Diesel Soot Measurement By Laser Opacity, Jonathan Audish, Brian Ko, Edward Ma, Travis Mcdaniel

Electrical Engineering

This project looks into understanding the concentration of soot being omitted by a diesel engine through the creation of an innovative opacity sensor. The system contains a receiver circuit implementing a photodiode, laser with wavelength of 405±10nm, and a microcontroller with analog-to-digital (A/D) converter. As the laser pulsates, the microcontroller collects and processes the data to calculate the amount of soot within the exhaust system. The opacity sensor in our tests will be used on an Isuzu 1.9 liter diesel engine. The elegant design of the system can be integrated into conventional manufacturing molding or casting processes for new exhaust …

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Application Of Wireless Power For Charging The Battery Of A Wireless Mouse, Jacob Keast, Vincent Jison Dec 2012

Application Of Wireless Power For Charging The Battery Of A Wireless Mouse, Jacob Keast, Vincent Jison

Electrical Engineering

Electronic devices are a part of all modern homes, but restricted by available outlets and the hassle of wires. With the modern wireless mouse, this is also the case. When the battery is low the consumer has several options: it is replaced with a new battery, it can be recharged using a USB wire, or the mouse is placed on a charging dock. This project provides an alternative to these options and allows the mouse’s battery to be charged via wireless inductive coupling. The wireless power charging system that was implemented in this project was successful in its ability to …

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Radio Link Analysis And Characterization Of Past And Future Cal Poly Cubesats, Brian Gilbert Tubb Dec 2012

Radio Link Analysis And Characterization Of Past And Future Cal Poly Cubesats, Brian Gilbert Tubb

Electrical Engineering

Cal Poly's satellites design team, PolySat, has three satellites in Low Earth Orbit (LEO) and four more planned to launch within the next two years. Radio communication of past and current orbiting satellites has been an exercise in frustration, prompting significant research into the satellite-side of the radio link by several other Senior Projects and Thesis papers. However, minimal effort has been spent on evaluating why these problems were discovered only once the satellites reached orbit. This paper details the downfalls of relying heavily on link budgets and improper long range test setups, then experimentally determines the sensitivity of PolySat's …

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Rssi-Based Localization In Cellular Networks, Lei Wang, Maciej Zawodniok Dec 2012

Rssi-Based Localization In Cellular Networks, Lei Wang, Maciej Zawodniok

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a novel RSSI based localization scheme that employs an existing cellular network infrastructure to perform trilateration. Traditional localization schemes employ RSSI-Based radial distance estimation and trilateration algorithm. However, in a realistic scenario, the RSSI measurements are distorted due to multipath fading thus introducing error in radial distance estimation. Moreover, the selection of the best three anchor cell towers with the lowest localization error is not explored. the proposed scheme improves localization accuracy using two, novel correcting and evaluating metrics: The Radial Distance Error Indicator (RDEI) and the Localization Error Indicator (LEI). the proposed RDEI metric is derived …

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Computational Design Of The Electrical And Mechanical Performance Of Steerable Mems Antennas, Morgan Andrew Roddy Dec 2012

Computational Design Of The Electrical And Mechanical Performance Of Steerable Mems Antennas, Morgan Andrew Roddy

Graduate Theses and Dissertations

This thesis describes the origins, improvements, and variations of a broadband microwave antenna that can be beam-steered by a micro-electromechanical system (MEMS). The steerable MEMS antenna of this work was comprised of a planar antenna on top of a Silicon membrane. The membrane is etched to create a gimbal hinge structure and a platform which supported the antenna and gave it one or two degrees of freedom of rotation. The antennas presented were broadband and fed by a coplanar waveguide (CPW) transmission line which traversed the hinge structure. The antenna's orientation in space was designed to be changed through electrostatic …

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Skin-Effect Model For Round Wires In Peec, Albert E. Ruehli, Giulio Antonini, Lijun Jiang Dec 2012

Skin-Effect Model For Round Wires In Peec, Albert E. Ruehli, Giulio Antonini, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper we consider the skin-and radiation effects for a thin wire segment. Circuit models are being constructed which are suitable for the modeling of thin wires like the wire bonds. We use the internal-external inductance model for this purpose of including the skin-effect in the partial inductance. These models make it possible to include thin, round conductors in a PEEC model at a much lower cost in compute time. The ultimate goal is to construct a circuit model which can be applied both in the time and frequency domain to signal and power integrity problems. © 2012 IEEE.

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Electromagnetic Emissions From The Ic Packaging, Nick K.H. Huang, Li (Lijun) Jun Jiang, Huichun Yu, Gang Li, Shuai Xu, Tao Wang, Huasheng Ren Dec 2012

Electromagnetic Emissions From The Ic Packaging, Nick K.H. Huang, Li (Lijun) Jun Jiang, Huichun Yu, Gang Li, Shuai Xu, Tao Wang, Huasheng Ren

Electrical and Computer Engineering Faculty Research & Creative Works

The EMC and EMI of the IC packaging are becoming increasingly important to modern electronics. Its EMC, SI, and PI have been broadly attested. But electromagnetic radiations from IC packaging and the corresponding EMI were seldom studied. In this paper, the fundamental principles and properties of the electromagnetic radiations caused by vias and traces in IC packagings are carefully investigated. Various radiation mechanisms are analyzed for different representative scenarios. Numerical simulations are employed to support the analyzing results. © 2012 IEEE.

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Linear Precoding Of Finite Alphabet Signals In Multi-Antenna Broadcast Channels, Yongpeng Wu, Mingxi Wang, Chengshan Xiao, Zhi Ding, Xiqi Gao Dec 2012

Linear Precoding Of Finite Alphabet Signals In Multi-Antenna Broadcast Channels, Yongpeng Wu, Mingxi Wang, Chengshan Xiao, Zhi Ding, Xiqi Gao

Electrical and Computer Engineering Faculty Research & Creative Works

We investigate the design of linear transmit precoding for multiple-input multiple-output (MIMO) broadcast channels (BC) with finite alphabet input signals. We derive an explicit expression for the achievable rate region of the MIMO BC with discrete constellation inputs, which is generally applicable to cases involving arbitrary user number and arbitrary antenna configurations. for the case where all the users employ the same modulation scheme, we further present a weighted sum rate upper-bound of the MIMO BC with identical transmit precoding matrices. the resulting bound demonstrates a serious performance loss due to multi-user interference for MIMO BC with finite alphabet inputs …

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Linear Mimo Precoding In Multi-Antenna Wiretap Channels For Finite-Alphabet Data, Yongpeng Wu, Chengshan Xiao, Zhi Ding, Xiqi Gao, Shi Jin Dec 2012

Linear Mimo Precoding In Multi-Antenna Wiretap Channels For Finite-Alphabet Data, Yongpeng Wu, Chengshan Xiao, Zhi Ding, Xiqi Gao, Shi Jin

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, we investigate the secrecy rate of finite alphabet communications over multiple-input, multiple-output, multiple-antenna eavesdropper (MIMOME) systems. Traditional precoder designs at the transmitter for achieving secrecy capacity (maximum secrecy rate) for MIMOME systems are developed according to the assumption of Gaussian input signals. Such designs may risk substantial secrecy rate loss when Gaussian inputs are replaced by practical finite alphabet inputs. to address this issue, we propose a linear precoding design to directly maximize the secrecy rate for MIMOME systems under the constraint of finite alphabet input. Exploiting convex optimization and matrix calculus, we present necessary conditions required …

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On The Diversity Gain Region Of The Z-Interference Channels, Mohamed S. Nafea, Karim G. Seddik, Mohammed Nafie, Hesham El Gamal Dec 2012

On The Diversity Gain Region Of The Z-Interference Channels, Mohamed S. Nafea, Karim G. Seddik, Mohammed Nafie, Hesham El Gamal

Electrical and Computer Engineering Faculty Research & Creative Works

In this work, we analyze the diversity gain region (DGR) of the single-antenna Rayleigh fading Z-Interference channel (ZIC). More specifically, we characterize the achievable DGR of the fixed-power split Han-Kobayashi (HK) approach under these assumptions. Our characterization comes in a closed form and demonstrates that the HK scheme with only a common message is a singular case, which achieves the best DGR among all HK schemes for certain multiplexing gains. Finally, we show that generalized time sharing, with variable rate and power assignments for the common and private messages, does not improve the achievable DGR. © 2012 IEEE.

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Online Optimal Control Of Affine Nonlinear Discrete-Time Systems With Unknown Internal Dynamics By Using Time-Based Policy Update, Travis Dierks, Sarangapani Jagannathan Dec 2012

Online Optimal Control Of Affine Nonlinear Discrete-Time Systems With Unknown Internal Dynamics By Using Time-Based Policy Update, Travis Dierks, Sarangapani Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, the Hamilton-Jacobi-Bellman equation is solved forward-in-time for the optimal control of a class of general affine nonlinear discrete-time systems without using value and policy iterations. the proposed approach, referred to as adaptive dynamic programming, uses two neural networks (NNs), to solve the infinite horizon optimal regulation control of affine nonlinear discrete-time systems in the presence of unknown internal dynamics and a known control coefficient matrix. One NN approximates the cost function and is referred to as the critic NN, while the second NN generates the control input and is referred to as the action NN. the cost …

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A Cross Layer Approach To The Novel Distributed Scheduling Protocol And Event-Triggered Controller Design For Cyber Physical Systems, Hao Xu, Sarangapani Jagannathan Dec 2012

A Cross Layer Approach To The Novel Distributed Scheduling Protocol And Event-Triggered Controller Design For Cyber Physical Systems, Hao Xu, Sarangapani Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

In Cyber Physical Systems (CPS), multiple real-time dynamic systems are connected to their corresponding controllers through a shared communication network in contrast with a dedicated line. for such CPS, the existing scheduling schemes for instance Centralized or Distributed Scheduling schemes are unsuitable since the behavior of real-time dynamic systems is ignored during the network protocol design. Therefore, in this paper, a novel distributed scheduling protocol design via cross-layer approach is proposed to optimize the performance of CPS by maximizing the utility function which is generated by using the information collected from both the application and network layers. Subsequently, a novel …

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Video Compressive Sensing With 3-D Wavelet And 3-D Noiselet, Dao Lam, Donald C. Wunsch Dec 2012

Video Compressive Sensing With 3-D Wavelet And 3-D Noiselet, Dao Lam, Donald C. Wunsch

Electrical and Computer Engineering Faculty Research & Creative Works

A new compressive video sampling method is investigated. as opposed to other video sampling methods for which processing is conducted on a single-frame basis, this method is applied on multiple frames of the video stream. by exploiting the extension of Wavelet to 3-D with the support of Noiselet 3-D and combining it with fast reconstruction algorithms, this framework produces successful results quickly while maintaining the quality of the video stream. Despite its simplicity, this new approach outperforms other sophisticated methods. © 2012 IEEE.

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Tdma For Wireless Passive Backscatter Networks: An Information Theoretic Approach, Aditya V. Padaki, Maciej Zawodniok Dec 2012

Tdma For Wireless Passive Backscatter Networks: An Information Theoretic Approach, Aditya V. Padaki, Maciej Zawodniok

Electrical and Computer Engineering Faculty Research & Creative Works

The passive backscatter technology is increasingly employed in wireless sensor network (WSN) applications. in contrast to existing technologies, it offers several advantages including a battery-less operation, extremely small-form factor, and low costs. Our previous works demonstrated that theoretically such backscatter-Based network outperforms existing solutions. in contrast, this paper presents a new time division multiple access (TDMA) based approach that considers a practical realization of the multi-hop framework. the capacity limits for the proposed scheme are evaluated for two frameworks - (a) single hop with direct backscatter signal and (b) a multi-hop transmission. an analytical comparison shows that the multi-hop transmission …

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Optimum Multi-Hop Transmission Strategies For Energy Constrained Wireless Sensor Networks, Jingxian Wu, Yahong Rosa Zheng Dec 2012

Optimum Multi-Hop Transmission Strategies For Energy Constrained Wireless Sensor Networks, Jingxian Wu, Yahong Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents optimum multi-hop transmission strategies (MHTS) for energy constrained wireless sensor networks (WSNs). Nodes in a multi-hop WSN need to transmit their own information and to relay each other's information to a base station (BS), and there are usually multiple available paths between a node and the BS. the optimum MHTS derived in this paper answers three questions: 1) how should a node divide its limited energy between the transmission of the self-information and the relay-information? 2) whether a single path or a combination of multiple paths should be used to route the information from a node to …

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A Low Complexity Algorithm For Linear Precoder Design With Finite Alphabet Inputs, Mingxi Wang, Yahong Rosa Zheng, Chengshan Xiao, Weiliang Zeng Dec 2012

A Low Complexity Algorithm For Linear Precoder Design With Finite Alphabet Inputs, Mingxi Wang, Yahong Rosa Zheng, Chengshan Xiao, Weiliang Zeng

Electrical and Computer Engineering Faculty Research & Creative Works

A low complexity precoding method is proposed for practical multiple-input multiple-output (MIMO) systems. based on the two-step optimal precoder design algorithm that maximizes the lower bound of the mutual information with finite-alphabet inputs, the proposed method simplifies the precoder design by fixing the right singular vectors of the precoder matrix to be the modulation diversity matrix, eliminating the iterative optimization between the two steps, and discretizing the search space of the power allocation vector. the modulation diversity matrices are designed for different modulations, which outperform the existing maximum diversity for BPSK and 8PSK inputs. for a 4x4 channel, the computational …

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Zheng Classification In Traditional Chinese Medicine Based On Modified Specular-Free Tongue Images, Ratchadaporn Kanawong, Tayo Obafemi-Ajayi, Jun Yu, Dong Xu, Shao Li, Ye Duan Dec 2012

Zheng Classification In Traditional Chinese Medicine Based On Modified Specular-Free Tongue Images, Ratchadaporn Kanawong, Tayo Obafemi-Ajayi, Jun Yu, Dong Xu, Shao Li, Ye Duan

Electrical and Computer Engineering Faculty Research & Creative Works

Traditional Chinese Medicine practitioners usually observe the color and coating of a patient's tongue to determine ZHENG (such as Cold or Hot ZHENG) and to diagnose different stomach disorders including gastritis. In our previous work, we explored new modalities for clinical characterization of ZHENG in gastritis patients via tongue image analysis using various supervised machine-learning algorithms. We proposed a system that learns from the clinical practitioner's subjective data how to classify a patients health status by extracting meaningful features from tongue images based on color-space models. In this paper, we propose an enhancement to the ZHENG classification system: a coating …

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Features For Automated Tongue Image Shape Classification, Tayo Obafemi-Ajayi, Ratchadaporn Kanawong, Dong Xu, Shao Li, Ye Duan Dec 2012

Features For Automated Tongue Image Shape Classification, Tayo Obafemi-Ajayi, Ratchadaporn Kanawong, Dong Xu, Shao Li, Ye Duan

Electrical and Computer Engineering Faculty Research & Creative Works

Inspection of the tongue is a key component in Traditional Chinese Medicine. Chinese medical practitioners diagnose the health status of a patient based on observation of the color, shape, and texture characteristics of the tongue. The condition of the tongue can objectively reflect the presence of certain diseases and aid in the differentiation of syndromes, prognosis of disease and establishment of treatment methods. Tongue shape is a very important feature in tongue diagnosis. A different tongue shape other than ellipse could indicate presence of certain pathologies. In this paper, we propose a novel set of features, based on shape geometry …

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