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Articles 1 - 14 of 14
Full-Text Articles in Engineering
Enabling Mobile Agents Communication, Mohammad Samarah, Philip K. Chan
Enabling Mobile Agents Communication, Mohammad Samarah, Philip K. Chan
Electrical Engineering and Computer Science Faculty Publications
In this paper, we investigate the need for well-suited remote communication architectures to address communication issues in mobile agent environments. We study the implication of mobility for agent architectures – specifically, ways in which the architecture may facilitate agent communication. We present an architecture for inter-agent communication suitable for remote messaging, agent monitoring, agent tracing, and agent debugging for mobile agent environments. The architecture allows for the dynamic adaptation of communication components. It provides for a seamless and continuous active communication during the agent migration process. We have implemented an agent framework simulator that conforms to all these requirements. The …
A Protocol Language Approach To Generating Client-Server Software, Philip K. Chan, Melvin A.L. Douglas
A Protocol Language Approach To Generating Client-Server Software, Philip K. Chan, Melvin A.L. Douglas
Electrical Engineering and Computer Science Faculty Publications
Client-server software is becoming more common as the Internet grows. To ease the burden of repeatedly writing low-level communication and protocol code, we seek to design a protocol language, My Simple Protocol Language (MSPL), that produces the corresponding communication functions. The programmer then supplies the rest of the application-specific code but never modifies the generated code. Besides saving development time, this approach also reduces programming errors. The potential to develop more efficient code also exists once the technique of generating code is mastered. The main contribution, however, is that unlike RPC, Corba or RMI, we provide the user with not …
Multiresolution Gradient-Based Edge Detection In Noisy Images Using Wavelet Domain Filters, Yunwoo Lee, Samuel Peter Kozaitis
Multiresolution Gradient-Based Edge Detection In Noisy Images Using Wavelet Domain Filters, Yunwoo Lee, Samuel Peter Kozaitis
Electrical Engineering and Computer Science Faculty Publications
We detected edges in noisy images using multiresolution analysis with the wavelet transform. Products of wavelet coefficients at several scales were used to identify and locate edges. We found that it was important to consider the changes in edge position at different scales to detect edges in noisy imagery. We analyzed one-dimensional edges and compared the results of our approach with the first derivative of the signal. In addition, we compared the results of noisy images with another wavelet-based edge detection method. Our results led to improved edge detection in noisy images.
Real-Time Performance Analysis Of Wireless Multimedia Networks Based On Partially Observed Multivariate Point Processes, William S. Hortos
Real-Time Performance Analysis Of Wireless Multimedia Networks Based On Partially Observed Multivariate Point Processes, William S. Hortos
Electrical Engineering and Computer Science Faculty Publications
Third-generation (3G) wireless networks will support integrated multimedia services based on a cellular extension of a packet-switched architecture using variants of the Internet protocol (IP). Services can be categorized as real-time and delaysensitive, or non-real-time and delay-insensitive. Each call, arriving to or active within the network, carries demand for one or more services in parallel; each service type with a guaranteed quality of service (QoS). Admission of new calls to the wireless IP network (WIN) from the gateway of a wired network or from a mobile subscriber (MS) is allowed by call admission control (CAC) procedures. Roaming of the MSs …
Pattern Classification Approach To Underwater Acoustic Communications Based On The Wigner-Ville Distribution, Frank M. Caimi, Gamal A. Hassan
Pattern Classification Approach To Underwater Acoustic Communications Based On The Wigner-Ville Distribution, Frank M. Caimi, Gamal A. Hassan
Electrical Engineering and Computer Science Faculty Publications
This paper describes an approach and preliminary results associated with the use of pattern recognition techniques to identify transmitted information (symbols) in a temporally variant acoustic channel. The method allows the observation of the transmitted signal simultaneously in both time and frequency space and does not necessarily rely on the application of adaptive algorithms for reception. The observation of the symbol energy from the Wigner-Ville Distribution as two-dimensional pattern can allow the determination of channel characteristics over short symbol sequences and can provide a means for symbol detection. For the QPSK modulation used, wavelet filtering provides a basis for noise …
2deg Channel-Dependent Model For Hg1-Xcdxte Based Pseudomorphic Hemts, Hang-Ming Dai, Thomas J. Sanders
2deg Channel-Dependent Model For Hg1-Xcdxte Based Pseudomorphic Hemts, Hang-Ming Dai, Thomas J. Sanders
Electrical Engineering and Computer Science Faculty Publications
HgCdTe has emerged as an important electronic material because of its IRFPA applications. Technologies for growing the material are advanced and current sources for the material are more readily available than in the past. This brings an advantage to the manufacturing other types of HgCdTe devices. PHEMTs are attractive as applications of high-speed devices. In this paper, a model for PHEMT devices by using Hg1 Cd1Te as device materials is presented. High digital performance of the device is expected because electron mobility ofthe material is very high at low temperatures.
Computation For Crosstalk Effects In P-On-N Hg1-Xcdxte Heterojunction Irfpa Radiated By Using Uniformly Parallel Light, Hang-Ming Dai, Thomas J. Sanders
Computation For Crosstalk Effects In P-On-N Hg1-Xcdxte Heterojunction Irfpa Radiated By Using Uniformly Parallel Light, Hang-Ming Dai, Thomas J. Sanders
Electrical Engineering and Computer Science Faculty Publications
in our work, a three-dimensional IRFPA model has been constructed to conduct device simulations for drift-diffusion based Hg1 CdTe devices. The model uses the finite element method and numerical errors are automatically eliminated during computation. Computational results can thus easily achieve accuracy. The computer model was constructed by using C++ language. We have successfully represented simulation results in three-dimensional graphics. In this paper, a model for analyzing infrared-illuminated p-on-n photodiodes is presented. The computational results were verified analytically and experimentally. Furthermore, an IRFPA device model was built for calculating crosstalk by using uniformly collimated infrared radiation. Devices used for the …
Bit Allocation Considering Mean Absolute Error For Image Compression, Hemen Goswami, Samuel Peter Kozaitis
Bit Allocation Considering Mean Absolute Error For Image Compression, Hemen Goswami, Samuel Peter Kozaitis
Electrical Engineering and Computer Science Faculty Publications
In lossy image compression schemes, often some distortion measure is minimized to arrive at a desired target bit rate. The distortion measure that has been most studied is the mean-squared-error (MSE). However, perceptual quality often does not agree with the notion of minimization of mean square error1 . Since MSE can not guarantee the optimality of perceptual quality, others error measures have been investigated. Others have found strong mathematical and practical perspective to choose a different error measure other than MSE, especially for image compression2. In Ref. 2 it is argued that the mean absolute error (MAE) measure is a …
Wavelet-Based Image Compression Using Randomized Quantization, Samuel Peter Kozaitis, Hemen Goswami
Wavelet-Based Image Compression Using Randomized Quantization, Samuel Peter Kozaitis, Hemen Goswami
Electrical Engineering and Computer Science Faculty Publications
We applied dithered quantization to image compression using a wavelet transform, scalar quantization method. The results indicate that dithered quantization could change the noise characteristics ofthe reconstructed image.
Circular Optimal Trade-Off And Distance-Classifier Correlation Filters, Samuel Peter Kozaitis, Sila Thangwaritorn
Circular Optimal Trade-Off And Distance-Classifier Correlation Filters, Samuel Peter Kozaitis, Sila Thangwaritorn
Electrical Engineering and Computer Science Faculty Publications
We use circular versions of advanced distortion-invariant filters such as optimal trade-off synthetic discriminant function and distance classifier correlation filters to obtain rotation invariance with an optical correlator. The filter noise performance is compared using a common measure of probability of error because the filters have different characteristics. The filters are real-valued so they can be implemented on a variety of SLMs. The circular symmetry of the filters significantly decreases their computational requirement.
Obtaining Objective Measurements Of Reaction Times To Auditory Alarms, Andrew George Neubauer
Obtaining Objective Measurements Of Reaction Times To Auditory Alarms, Andrew George Neubauer
Theses and Dissertations
Several pulse parameters that were believed to affect response time to auditory alarms were investigated in a factorial experiment. 18 subjects, (14 male, 4 female), participated in an experiment where the effects of inter-pulse interval (125, 250, and 500 milliseconds) and pulse format (sine, sawtooth, and square waves) on both selfreported ratings of workload and reaction time to alarms (auditory and visual) were explored. The results show that alarms with a shorter inter-pulse interval produced the fastest reaction times. Subjective preferences were rated as equal. Accuracy was equal across groups as measured by amount of errors in responding to auditory …
Adaptive Handoff Algorithms Based On Self-Organizing Neural Networks To Enhance The Quality Of Service Of Nonstationary Traffic In Hierarchical Cellular Networks, William S. Hortos
Adaptive Handoff Algorithms Based On Self-Organizing Neural Networks To Enhance The Quality Of Service Of Nonstationary Traffic In Hierarchical Cellular Networks, William S. Hortos
Electrical Engineering and Computer Science Faculty Publications
Third-generation (3G) wireless networks, based on a hierarchical cellular structure (HCS), support tiered levels of multimedia services. These services can be categorized as real-time and delay-sensitive, or non-real-time and delay-insensitive. Each call carries demand for one or more services in parallel; each with a guaranteed quality of service (QoS). Roaming is handled by handoff procedures between base stations (BSs) and the mobile subscribers (MSs) within the network. Metrics such as the probabilities of handoff failure, dropped calls and blocked calls; handoff transition time; and handoff rate are used to evaluate the handoff schemes, which also directly affect QoS. Previous researchers …
Separation Of Infrasound Signals Using Independent Component Analysis, Fredric M. Ham, Sungin Park, Joseph C. Wheeler
Separation Of Infrasound Signals Using Independent Component Analysis, Fredric M. Ham, Sungin Park, Joseph C. Wheeler
Electrical Engineering and Computer Science Faculty Publications
An important element of monitoring compliance of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) is an infrasound network. For reliable monitoring, it is important to distinguish between nuclear explosions and other sources of infrasound. This will require signal (event) classification after a detection is made. We have demonstrated the feasibility of using neural networks to classify various infrasonic events. However, classification of these events can be made more reliably with enhanced quality of the recorded infrasonic signals. One means of improving the quality of the infrasound signals is to remove background noise. This can be carried out by performing signal separation using …
Implementations Of Bidirectional Reordering Algorithms, Steven Atkin, Ryan Stansifer
Implementations Of Bidirectional Reordering Algorithms, Steven Atkin, Ryan Stansifer
Electrical Engineering and Computer Science Faculty Publications
The goal of this paper is to contribute to a deeper understanding of the Unicode Bidirectional Reference Algorithm. We have provided an alternative reference algorithm written in the functional language Haskell. The advantage of Haskell is it allows for a short, clear description of a complex problem. We have run our algorithm, the two Unicode reference implementations, and four others (ICU, PGBA, FriBidi, JDK 1.2) to test for compliance with the published standard. Conclusions are difficult to reach, but problems were found in the implementations and descriptions and above all with a character-stream to character-stream interpretation of the display of …