Digital Commons Network^™

Measurements Of Seismic Road Vibrations, L. T. Long

International Conference on Case Histories in Geotechnical Engineering

Vibrations from vehicles on adjacent roads can impact sensitive instruments or structures with historic significance. The amplitudes of vibrations (A) from steady traffic in Atlanta, Georgia, were found to decay with distance (r) according to the relation Log[A(mm/s) ]=0.9-1.25Log(r(m)]. Intervening topographic relief reduces the level of vibration. Using this relation, the impact of a proposed highway was estimated to cause an 8 percent degradation in photographic images with telescope. A topographic barrier could reduce, but would not eliminate the impact of highway vibration. In a second application, a freeway access ramp was originally planned close enough for the vibrations from …

General Report Session No. 4: Case Histories Man-Made Vibrations, Vijay K. Puri, James P. Lee

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Discussions And Replies Session 4, M. R. Svinkin, G. M. S. Manyando, M. R. Lewis, J. R. Davie, X. J. Yang, G. Y. Gao

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

The Missouri Miner, May 05, 1993

The Missouri Miner Newspaper

No abstract provided.

Diagnosis Of Malignant Melanoma Using A Neural Network, Anurag Chawla, Fikret ErçAl

Computer Science Technical Reports

Malignant melanoma is the deadliest form of all skin cancers. Approximately 32,000 new cases of malignant melanoma were diagnosed in 1991, with approximately 80 percent of patients expected to survive five years [1], Fortunately, if detected early, even malignant melanoma may be treated successfully. Thus, in recent years, there has been a rising interest in the automated detection and diagnosis of skin cancer, particularly malignant melanoma [2]. In this thesis, a novel neural network approach for the automated distinction of melanoma from three benign categories of tumors which exhibit melanoma-like characteristics is presented. The approach is based on devising new …

An Analysis Of Modern Cryptosystems, Thomas Gerald Sauder, Chung You Ho

Computer Science Technical Reports

Since the ancient Egyptian empire, man has searched for ways to protect information from getting into the wrong hands. Julius Caesar used a simple substitution cipher to protect secrets. During World War II, the Allies and the Axis had codes that they used to protect information. Now that we have computers at our disposal, the methods used to protect data in the past are ineffective. More recently, computer scientists and mathematicians have been working diligently to develop cryptosystems which will provide absolute security in a computing environment.

The three major cryptosystems in use today are DES, RSA, and the Knapsack …

Parallel Genetic Algorithms For The Dag Vertex Splitting Problem, Matthias Mayer, Fikret ErçAl

Computer Science Technical Reports

Directed Acyclic Graphs are often used to model circuits and networks. The path length in such Directed Acyclic Graphs represents circuit or network delays. In the vertex splitting problem, the objective is to determine a minimum number of vertices from the graph to split such that the resulting graph has no path of length greater than a given δ. The problem has been proven to be NP-hard.

A Sequential Genetic Algorithm has been developed to solve the DAG Vertex Splitting Problem. Unlike a standard Genetic Algorithm, this approach uses a variable chromosome length to represent the vertices that split the …

The Interpolating Random Spline Cryptosystem And The Chaotic-Map Public-Key Cryptosystem, Fengi Hwu, Chung You Ho

Computer Science Technical Reports

The feasibility of implementing the interpolating cubic spline function as encryption and decryption transformations is presented. The encryption method can be viewed as computing a transposed polynomial. The main characteristic of the spline cryptosystem is that the domain and range of encryption are defined over real numbers, instead of the traditional integer numbers. Moreover, the spline cryptosystem can be implemented in terms of inexpensive multiplications and additions.

Using spline functions, a series of discontiguous spline segments can execute the modular arithmetic of the RSA system. The similarity of the RSA and spline functions within the integer domain is demonstrated. Furthermore, …

The Design, Analysis, And Implementation Of Parallel Simulated Annealing And Parallel Genetic Algorithms For The Composite Graph Coloring Problem, Brent S. Elmer, Billy E. Gillett

Computer Science Technical Reports

The composite graph coloring problem (CGCP) is similar to the standard graph coloring problem (SGCP). Associated with each vertex of a composite graph is a positive integer which represents the chromaticity of that vertex. This number is the number of consecutive integers (colors) which must be assigned to the vertex. The goal of the CGCP is to color the graph with as few colors as possible. The largest integer used in the coloring is called the chromatic number of the graph. The CGCP is proven to be NP-complete.

Exact, heuristic, and stochastic methods are analyzed and compared. Exact methods are …

Considerations For Rapidly Converging Genetic Algorithms Designed For Application To Problems With Expensive Evaluation Functions, Richard Patrick Rankin, Ralph W. Wilkerson

Computer Science Technical Reports

A genetic algorithm is a technique designed to search large problem spaces using the Darwinian concepts of evolution. Solution representations are treated as living organisms. The procedure attempts to evolve increasingly superior solutions. As in natural genetics, however, there is no guarantee that the optimum organism will be produced.

One of the problems in producing optimal organisms in a genetic algorithm is the difficulty of premature convergence. Premature convergence occurs when the organisms converge in similarity to a pattern which is sub-optimal, but insufficient genetic material is present to continue the search beyond this sub-optimal level, called a local maximum. …

120kev Ar8+-Li Collisions Studied By Near Uv And Visible Photon Spectroscopy, E. Jacquet, P. Boduch, M. Chantepie, M. Druetta, D. Hennecart, X. Husson, D. Lecler, Ronald E. Olson, J. Pascale, N. Stolterfoht, M. Wilson

Physics Faculty Research & Creative Works

A spectroscopic analysis of light emitted in the 200-600 nm wavelength range by Ar⁷⁺, Ar⁶⁺ and Ar⁵⁺ ions after charge exchange in 120keV Ar⁸⁺-Li collisions is performed. Transitions with Δn = 1 and Δn = 2 for n = 8, 9, 10 and 11 states of Ar8 following single electron capture are identified and the production cross sections for n = 8 and n = 9 are deduced from emission cross sections and compared with those calculated by the three-body classical trajectory Monte-Carlo method. Lines due to double capture process were observed and identified …

Cartographic Pattern Recognition Using Template Matching, Angela G. Lammers, Ralph W. Wilkerson, Fikret ErçAl

Computer Science Technical Reports

In creating digital maps from paper maps, the paper map must first be scanned to produce a raster image, and then converted into vector format. Vector format allows non-graphical cartographic information to be stored along with the graphical objects. At the United States Geological Survey, the conversion from raster to vector format is performed by a commercial software package. The package also attempts to classify the graphical objects based on shape, line patterns, and other information gained from the raster file. Since the package frequently fails to classify a significant percentage of the elements in the map, manual map analysis …

Missouri S&T Magazine, May 1993, Miner Alumni Association

Missouri S&T Magazine

No abstract provided.

Third International Conference On Case Histories In Geotechnical Engineering, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Resonant Inhibition Of Multiphoton Ionization, J. Greg Story, D. I. Duncan, Thomas F. Gallagher

Physics Faculty Research & Creative Works

When exposed to intense light of ~580 nm, the ground state of K shifts up in energy, passing through two-photon resonances with Rydberg states and finally crossing the two-photon ionization limit. Using laser pulses of 0.5 to 13 ps duration, we have shown experimentally that ionization occurs for short pulses, but for long pulses the population is diverted into the Rydberg states where some population survives the peak intensity of the pulse, in excellent agreement with a dynamic Floquet model.

A Neutron Diffraction And Mössbauer Effect Study Of The Magnetic Structure Of Y₂(Fe₁₋ₓmnₓ)₁₄B, Gaya Kanishka Marasinghe, Oran Allan Pringle, Gary J. Long, William Joseph James, William B. Yelon, Fernande Grandjean

Physics Faculty Research & Creative Works

The magnetic structures of a series of Y₂(Fe _1-xMn_x)₁₄B samples, with x equal to 0.03, 0.10, 0.25, and 0.37, have been studied by powder neutron diffraction and Mössbauer spectroscopy. Y₂(Fe_0.97Mn _0.03)₁₄B and Y₂(Fe_0.9Mn _0.1)₁₄B are ferromagnetic at both 295 and 85 K, Y ₂(Fe_0.63Mn_0.37)₁₄B is paramagnetic at both 295 and 85 K, whereas Y₂(Fe_0.75Mn _0.25)₁₄B is paramagnetic at 295 K and is partially ordered at …

The Missouri Miner, April 28, 1993

The Missouri Miner Newspaper

No abstract provided.

The Missouri Miner, April 21, 1993

The Missouri Miner Newspaper

No abstract provided.

The Missouri Miner, April 14, 1993

The Missouri Miner Newspaper

No abstract provided.

The Missouri Miner, April 07, 1993

The Missouri Miner Newspaper

No abstract provided.

Derivatized Cyclodextrins Immobilized On Fused-Silica Capillaries For Enantiomeric Separations Via Capillary Electrophoresis, Gas Chromatography, Or Supercritical Fluid Chromatography, Daniel W. Armstrong, Yubing Tang, Timothy Ward, Molly Nichols

Chemistry Faculty Research & Creative Works

No abstract provided.

Monte Carlo Simulations Of Water-Ice Layers On A Model Silver Iodide Substrate: A Comparison With Bulk Ice Systems, James H. Taylor, Barbara N. Hale

Physics Faculty Research & Creative Works

Two water layers adsorbed on a model silver iodide basal face are simulated at nine temperatures from 150 to 425 K using Monte Carlo methods. The periodic unit cell of 96 internally rigid water molecules (interacting via the revised central-force potentials) couples to the rigid-substrate atoms via effective pair potentials with Lennard-Jones short-range and Coulomb long-range terms. The distribution of molecules perpendicular to the substrate exhibits layering, and individual layer structure factors, dipole moments, and "pseudodiffusion" coefficients are calculated. A complex temperature dependence with the two layers taking on different solidlike, quasiliquid, or liquid properties at the same T is …

Residual-Ion Orientation After Autoionization, G. T. Xu, Xiao Wang, J. Greg Story, William E. Cooke

Physics Faculty Research & Creative Works

We have measured the relative population in the two m_j states of barium 6p_1/2 ions produced by the autoionization of (6p_3/2nd)_J=MJ=3 states by detecting the helicity of the emitted fluorescence. These populations can be related to the relative branching ratio into the 6p_1/2εd_5/2 and 6p_1/2εg_7/2 continuum channels. Rydberg states with n=16-23 have similar branching ratios, producing approximately six times as much 6p_1/2εd_5/2 population as 6p_1/2εg_7/2 population.

Evaluation Of Yba,Cu,O,_, Bulk Superconductors For High Field Magnet Applications, K. Y. Blohowiak, D. F. Garrigus, T. S. Luhman, K. E. Mccrary, M. Strasik, I. A. Aksay, Fatih Dogan, W. B. Hicks, J. Liu, M. Sarikaya

Materials Science and Engineering Faculty Research & Creative Works

Processing of YBCO single crystals was carried out by solidification of semi-liquid YBCO composition using a seeding technique. Microstructural characterization of the pinning centers was investigated by transmission electron microscopy. Characterization of single crystals was carried out, relating grain size and shape to the corresponding flux profiles. Current densities were calculated based on measured trapped fields. Once circulating currents were established, flux pumping and quenching experiments were conducted. These large single crystals will be incorporated into electromagnetic forming devices for use in the military and commercial aircraft manufacturing and service industries.

Evaluation Of Yba2cu3o7-X Bulk Superconductors For High Field Magnet Applications, K. Y. Blohowiak, D. F. Garrigus, T. S. Luhman, K. E. Mccrary, M. Strasik, Ilhan A. Aksay, Fatih Dogan, W. B. Hicks, J. Liu, M. Sarikaya

Materials Science and Engineering Faculty Research & Creative Works

Processing of YBCO single crystals was carried out by solidification of semi-liquid YBCO composition using a seeding technique. Microstructural characterization of the pinning centers was investigated by transmission electron microscopy. Characterization of single crystals was carried out, relating grain size and shape to the corresponding flux profiles. Current densities were calculated based on measured trapped fields. Once circulating currents were established, flux pumping and quenching experiments were conducted. These large single crystals will be incorporated into electromagnetic forming devices for use in the military and commercial aircraft manufacturing and service industries.

The Missouri Miner, March 24, 1993

The Missouri Miner Newspaper

No abstract provided.

The Missouri Miner, March 17, 1993

The Missouri Miner Newspaper

No abstract provided.

The Missouri Miner, March 10, 1993

The Missouri Miner Newspaper

No abstract provided.

The Missouri Miner, March 03, 1993

The Missouri Miner Newspaper

No abstract provided.

A Hybrid Genetic Algorithm For An Np-Complete Problem With An Expensive Evaluation Function, Richard Rankin, Ralph W. Wilkerson, Geoff Harris, Jo Spring

Computer Science Faculty Research & Creative Works

In This Paper, a Non-Standard Hybrid Genetic Algorithm is Presented. the Approach is Non-Standard in that It Violates Some of the Common Attributes Associated with Genetic Algorithms in the Literature. the Algorithm Presented Uses Local Maxima to Locate the Global Maximum Value, Uses Haploid Chromosomes with Dominance Mating Instead of Crossover, Generates One Offspring Per Set of Parents, Has No Specific Mutation Operator, and is Designed for Rapid Convergence. When Applied to an NP-Complete Problem, the Results of This Hybrid Algorithm Are Shown to Be Very Successful in Reducing the Complexity of the Problem.