Electrical and Computer Engineering Commons^™

Emp Protection Validation Testing Approaches, George H. Baker

George H Baker

Integrated, operational system-level testing is required for confidence in any system's EMP hardness. Validation is not possible by analysis or inspection. Test capabilities exist to validate the EMP protection of properly designed systems. High-level free field simulators are the means of choice for testing aircraft and ground mobile systems. A combination of low level continuous wave and pulsed current injection testing are preferred for testing fixed facilities and systems connected to long line networks.

A Method Of Validating Mw Mvar Values, Venkateswar P. Oruganti Fiete Fie Pmp

Venkateswar P Oruganti FIETE FIE PMP

A way of quickly validating MW MVAR values. This method helps in reducing number of combinations while trying to ascertain the right connections at the transducers in SCADA systems.

Parallel Machines: Parallel Machine Languages, Robert Iannucci

Robert A Iannucci

No abstract provided.

Image Segmentation Using Human Visual System Properties With Applications In Image Compression, Heidi A. Peterson, Sarah A. Rajala, Edward J. Delp

Sarah A. Rajala

Many image compression techniques involve segmentation of a gray level image. With such techniques, information is extracted that describes the regions in the segmented image, and this information is then used to form a coded version of the image. In this paper we present a region-growing-based segmentation technique that incorporates human visual system properties, and describe the use of this technique in image compression. We also discuss the effect of requantizing a segmented image. Requantization of a segmented image is useful because it can lead to a reduction in the number of bits required to code the description of the …

Progress In The Development Of Hemp Protection Standards For C3i Facilities, George H. Baker, Clinton R. Gordon

George H Baker

DoD is involved in EMP standards development efforts which culminate 25 years of research. This paper previews an EMP protection standard for fixed, ground-based communication facilities. The standard uses a low-risk hardening approach which depends on an electromagnetic barrier comprised of a conducting shield to prevent harmful transients from reaching communication electronics. The standard is the first of its kind and is being instituted as MIL-STD-188-125.

Segmentation-Based Image Coding In A Packet-Switched Network Environment, Sarah A. Rajala, Wonrae M. Lee

Sarah A. Rajala

In this paper, a segmentation-based image coding technique incorporating properties of the human visual system is presented. The approach taken in this research is to first segment an image into regions with spatial similarity and then to define an efficient method for encoding the segmented image data. Furthermore, specific attention is given in this paper to defining the requirements for using a segmentation-based image coder for video transmission over a packet-switched network.

"Power System Frequency Deviation Measurement Using An Electronic Bridge, Mukhtar Ahmad

Mukhtar Ahmad

No abstract provided.

Method And Apparatus For Division Pct:Ep0075745, Robert Iannucci, James Kleinsteiber

Robert A Iannucci

No abstract provided.

High Performance Memory System Utilizing Pipelining Techniques Us:4685088, Robert Iannucci

Robert A Iannucci

No abstract provided.

Second Generation Hybrid Image-Coding Techniques, M. Reha Civanlar, Sarah A. Rajala, Wonrae M. Lee

Sarah A. Rajala

Recently, ways to obtain a new generation of image-coding techniques have been proposed. The incorpordtion of the human visual system (IIVS) models and tools of the image analysis, such as segmentation, are two defining features of these techniques. In this paper, an application of the new approach to the classical linear predictive coding (LPC) of images and an HVS based segmentation technique for the second genera-tion coders will be discussed. In the case of LPC, the error image is encoded using an image decomposition approach and binary image coding. This improves the compression ratio keeping the quality nearly the same. …

Implementation Of A Projection Onto Convex Sets Iteration Based Image Coder, M. Reha Civanlar, Sarah A. Rajala, Thomas K. Miller

Sarah A. Rajala

Projection onto convex sets iteration based image coding, where efficiently encodable sets are used to describe an image, is a recent approach to image compression. The technique allows the use of a variety of sets to encode an image. The focus of this paper, however, will be on two particular sets: the set of images whose cosine transform is known for certain frequencies and the set of images which are nonzero over a specified region. These sets can be used to encode interframe difference pictures of video teleconferencing images. A drawback of this new type of codec is its computational …

New Solution For Frequency And Pixel Domain Coding Using Convex Sets, Pete Santago, Sarah A. Rajala

Sarah A. Rajala

This paper describes a new algorithm for combining spatial and frequency domain information about an image in order to improve coding. The algorithm utilizes successive projections onto two non-intersecting sets in order to determine the optimal frequency domain coefficients to transmit given some known spatial information. This technique is best suited to fixed block size transform coders and builds on the techniques used in previous work.

Technique For Video Compression By Projection Onto Convex Sets, P. Santago, Sarah A. Rajala

Sarah A. Rajala

This paper describes a video compression technique which utilizes the alternating projection theorem for convex sets. The image to be transmitted is determined to be in certain convex sets and parameters defining these sets are sent. The receiver can then use the method of successive projections to locate an image which is in the intersection of the sets. If the intersection is small then the image determined should be close to the desired image. The coder can be made more robust by easily adding additional convex sets or using it in conjunction with other coding schemes such as motion compensation.

A Digital Tachometer For Measurement Of Low Speeds, Mukhtar Ahmad

Mukhtar Ahmad

No abstract provided.

An Evaluation Of The Directed Flow Graph Methodology, Wesley E. Snyder, Sarah A. Rajala

Sarah A. Rajala

The purpose of this project was to evaluate the applicability of the Directed Graph Methodology (DGM) to the design and analysis of special purpose image and signal processing hardware. To this end, a special purpose image processing system was designed and described using DGM. The design, suitable for VLSI, implements an innovative region labeling technique. The utility of DGM was evaluated using this design.

Method And Apparatus For Division Employing Associative Memory Us:4466077, Robert Iannucci, James Kleinsteiber

Robert A Iannucci

No abstract provided.

Turbine Blade Image Processing System, Neal S. Page, Wesley E. Snyder, Sarah A. Rajala

Sarah A. Rajala

A vision system has been developed at North Carolina State University to identify the orientation and three dimensional location of steam turbine blades that are stacked in an industrial A-frame cart. The system uses a controlled light source for structured illumination and a single camera to extract the information required by the image processing software to calculate the position and orientation of a turbine blade in real time.

Electro-Optics Applications For Alleviating Emi/Emc/Emp Problems, George H. Baker, Walter H. Hardwick

George H Baker

No abstract provided.

A Study Of Real-Time Computer Graphic Display Technology For Aeronautical Applications, Sarah A. Rajala

Sarah A. Rajala

The development, simulation, and testing of an algorithm for anti-aliasing vector drawings is discussed. The pseudo anti-aliasing line drawing algorithm is an extension to Bresenham's algorithm for computer control of a digital plotter. The algorithm produces a series of overlapping line segments where the display intensity shifts from one segment to the other in this overlap (transition region). In this algorithm the length of the overlap and the intensity shift are essentially constants because the transition region is an aid to the eye in integrating the segments into a single smooth line.

Adaptive Nonlinear Image Restoration By A Modified Kalman Filtering Approach, Sarah A. Rajala

Sarah A. Rajala

An adaptive nonlinear Kalman-type filter is presented in this dissertation for the restoration of two-dimensional images degraded by general image formation system degradations and additive white noise. A vector difference evaluation model is used to model the degradation process. The object plane distribution function is partitioned into disjoint regions based on the amount of spatial activity in the image, and difference evaluation models are used to characterize the object plane distribution function.

It is shown that each of the regions can be uniquely characterized by their second order statistics. The autocorrelation function for each region is then used to determine …

Emp Analysis Of An Fm Communications Radio With A Long Wire Antenna, George H. Baker Iii, Werner J. Stark

George H Baker

A Norton equivalent circuit is developed for a long-wire antenna used with a VHF man-pack FM radio exposed to an incident electromagnetic pulse (EMP). The required short-circuit current and antenna impedance are computed by use of a transmission-line model for the antenna, and the computations are compared with measurements of the short-circuit current and antenna impedance. The comparison shows that the transmission-line model for the antenna is adequate for performing a vulnerability analysis of the radio. A network model is developed for a portion of the radio and is used as the load in the Norton equivalent circuit. Load currents …