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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 20, Number 4, February 2004, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

An eight page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

Acuta Enews February 2004, Vol. 33, No. 2

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From the President................................... Walter L' Czerniak

Coverage for Wireless Phone Services ............................. Howie Frisch, UT Starcom

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Tech Talk....................... Kevin Tanzillo, Dux Public Relations

DC Update............................ Whitney Johnson, Retired, Northern Michigan Univ.

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WLNP Part 2................................. Ed Quinn, The Ohio State University

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Sensitivity Analysis Of Hill Muscle Parameters, Janet Brelin-Fornari, Paras Shah, Mohamed El-Sayed

Crash Safety Center Publications

A computational, rigid body model of a 50^th percentile male head and neck utilizing 15 Hill Muscle pairs is used to study the sensitivity of Hill Muscle Model parameters. A 15g linear acceleration is applied within the transverse plane at the lowest vertebral level of the neck (T1). The resultant linear acceleration of the head is analyzed. In response is minimally affected. The peak accelerations did change, and in the case of varying muscle activation, the peak acceleration changed significantly, 36%. Each of the other parameter variations affected the peak acceleration of the head by less than 5%. Overall, …

On The Use Of Intervals In Scientific Computing: What Is The Best Transition From Linear To Quadratic Approximation?, Martine Ceberio, Vladik Kreinovich, Lev Ginzburg

Departmental Technical Reports (CS)

In many problems from science and engineering, the measurements are reasonably accurate, so we can use linearization (= sensitivity analysis) to describe the effect of measurement errors on the result of data processing. In many practical cases, the measurement accuracy is not so good, so, to get a good estimate of the resulting error, we need to take quadratic terms into consideration - i.e., in effect, approximate the original algorithm by a quadratic function. The problem of estimating the range of a quadratic function is NP-hard, so, in the general case, we can only hope for a good heuristic. Traditional …

Ultra-Wide (Uwb) Communications: New Paradigms And Opportunities., Robert H. Morelos-Zaragoza

Faculty Publications

In this talk, the unique characteristics of ultra wideband (UWB) communications systems are introduced. Receiver design considerations are presented. Focus is on the relation between the symbol duration and the delay spread of the channel. This determines whether the receiver should use a Rake receiver (Spread-spectrum system) or an equalizer (multiple carrier or OFDM system).

Evaluation Of Modal And Fema Pushover Analyses: Sac Buildings, Rakesh K. Goel, Anil K. Chopra

Civil and Environmental Engineering

This paper comprehensively evaluates the Modal Pushover Analysis (MPA) procedure against the ‘‘exact’’ nonlinear response history analysis (RHA) and investigates the accuracy of seismic demands determined by pushover analysis using FEMA-356 force distributions; the MPA procedure in this paper contains several improvements over the original version presented in Chopra and Goel (2002). Seismic demands are computed for six buildings, each analyzed for 20 ground motions. It is demonstrated that with increasing number of ‘‘modes’’ included, the height-wise distribution of story drifts and plastic rotations estimated by MPA becomes generally similar to trends noted from nonlinear RHA. The additional bias and …

A "Divide And Conquer" Technique For Implementing Wide Dynamic Range Continuous-Time Filters, Yorgos Palaskas, Yannis Tsividis, Vladimir I. Prodanov, Vito Boccuzzi

Electrical Engineering

This paper presents a technique for implementing analog filters with wide dynamic range and low power dissipation and chip area. The desired dynamic range of the filter is divided into subranges, each covered by a different filtering path optimized specifically for this subrange. This results in small admittance levels for the individual filtering paths and correspondingly small power dissipation and chip area. The system provides undisturbed output during range switching, contrary to conventional automatic gain control (AGC)/filter arrangements that generate disturbances every time the gain of the AGC changes. We also report on a low-noise highly linear CMOS transconductor useful …

Design And Development Of A Respiratory Monitoring Device To Be Used In Conjuction With Mri Scanners, Aidan Mcnally

Masters

The aim of this project was to design and manufacture a respiratory monitoring device that operates in conjunction with MRI scanners to produce higher quality images. The resultant quality of many MRI images depends on how well the patient can control their breathing activity. This research has been successful in designing and manufacturing a device that can be used to teach patients how to hold their breath correctly prior to scanning and also provide them with feedback about their breathing activity during the scan The project involved research into MRI technology and the materials that can still be used in …

Geometric Approach To Detecting And Locating Cracks In Thin Plates By Lamb Wave Reflection: Case Of Moving Transducer, Jose R. Mares, Roberto A. Osegueda, Nagaswaroopa Kaukuri, Vladik Kreinovich

Departmental Technical Reports (CS)

This paper portrays work for the development of a Lamb wave scanning method for the detection of defects in thin plates. The approach requires the generation of an ultrasonic A0 and S0-mode Lamb wave using an incident transmitter excited with a tone burst centered at a near non-dispersive frequency. With a fixed relative separation both transmitter and receiving transducer remotely scan a specific line section of the plate. The arrival time information coming from incident and reflected waves contain information associated with the location of reflection surfaces or potential flaws. The Hilbert-Huang transform is applied to the intrinsic mode functions …

From Intervals To? Towards A General Description Of Validated Uncertainty, Vladik Kreinovich, Gracaliz P. Dimuro, Antonio C. Da Rocha Costa

Departmental Technical Reports (CS)

In many real-life situations, we are interested in the physical quantities that are difficult or even impossible to measure directly. To estimate the value of such quantity y, we measure the values of auxiliary quantities x1,...,xn that are related to y by a known functional relation y=f(x1,...,xn), and we then use the results Xi of measuring xi to find the desired estimate Y=f(X1,..,Xn). Due to measurement errors, the measured values Xi are slightly different from the actual (unknown) values xi; as a result, our estimate Y is different from the actual value y=f(x1,...,xn) of the desired quantity.

When xi and …

2003 Motor Carrier Survey, Ronald E. Langley, Ted Grossardt

Kentucky Transportation Center Research Report

The goal of this study was to conduct a survey to evaluate usage and satisfaction with the KYTC’s new program allowing motor carriers to credential vehicles and pay taxes via the Internet. Specifically, the study was to examine how many Kentucky motor carriers took advantage of this capability, why they did or did not, what improvements could be made to the system, and what incentives could be offered or obstacles removed to entice more motor carriers to use it.

Effect Of Supplementary Cementitious Materials On The Compressive Strength And Durability Of Short-Term Cured Concrete, H. Toutanji, Norbert Delatte, S. Aggoun, R. Duval, A. Danson

Civil and Environmental Engineering Faculty Publications

This research focuses on studying the effect different supplementary cementitious materials (silica fume, fly ash, slag, and their combinations) on strength and durability of concrete cured for a short period of time—14 days. This work primarily deals with the characteristics of these materials, including strength, durability, and resistance to wet and dry and freeze and thaw environments. Over 16 mixes were made and compared to the control mix. Each of these mixes was either differing in the percentages of the additives or was combinations of two or more additives. All specimens were moist cured for 14 days before testing or …

Text Categorization Based On Phrase Indexing, Hany Seif Habib

Archived Theses and Dissertations

This thesis investigates Information Retrieval (IR) field of research with focus on Text Categorization (TC) area. We study the available techniques and models used for classification of text documents to a predefined set of categories. We use a subset of Reuters - 21578 test collection for our research. We use the first 150 documents for training and the following 100 for testing. We use pre-processing steps such as parsmg, stop-word removal, and stemming using porter stemmer. We identify all possible phrases in a document during the pre-processing stage. We use only adjacent phrases of size two. We learn frequency information …

Ccfss News Spring 2004, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Newsletters (1999 - 2008)

No abstract provided.

Collapse Of 2000 Commonwealth Avenue: Punching Shear Case Study, Suzanne King, Norbert Delatte

Civil and Environmental Engineering Faculty Publications

On January 25, 1971, two thirds of a 16-story apartment building collapsed while under construction at 2000 Commonwealth Avenue, Boston, Massachusetts. Four workers died after a failure on the roof instigated a progressive collapse all the way to the basement, where the men were found. Fortunately, the collapse occurred slowly enough for most of the other workers to run to safety. An investigation, conducted by a commission assembled by the Mayor of Boston, painted a picture of a troubled project, with considerable confusion about responsibility for structural safety. The surviving workers’ descriptions of the failure provide a textbook definition of …

Using Covers To Minimize Odor And Gas Emissions From Manure Storages, José R. Bicudo, David R. Schmidt, Larry D. Jacobson

Agricultural Engineering Extension Publications

Odor emissions from animal production sites are typically the leading cause of nuisance complaints. Locating facilities far from neighbors is often a solution to the odor problem, but this is not always an option for producers. Most often, reducing odor emissions from the farm is the only option available.

Optical Characterization Of Ceramic Thin Films: Applications In Low-Temperature Solid Oxide Fuel-Cell Materials Research, Vladimir Petrovsky, Tatiana Petrovsky, Harlan U. Anderson, Brian P. Gorman

Materials Science and Engineering Faculty Research & Creative Works

Characterization of thin film solid oxide fuel-cell materials can be difficult due to the range of porosities in electrodes and electrolytes as well as the nano-sized pores and particles. In this study, optical characterization techniques such as ultraviolet-visible transmission and reflection spectrophotometry are illustrated as methods for achieving information about the film density from the film refractive index as well as the film thickness. These techniques were used to investigate the sintering process of colloidal CeO2 on sapphire substrates and polymeric precursor-derived ZrO2:16%Y (YSZ) thin films on silicon over the temperature range 400-1000 °C, and the results were compared with …

An Efficient Multirate Simulation Technique For Power-Electronic-Based Systems, Steven D. Pekarek, Oleg Wasynczuk, Eric A. Walters, Juri V. Jatskevich, Charles E. Lucas, Ning Wu, Peter T. Lamm

Electrical and Computer Engineering Faculty Research & Creative Works

A novel multirate method of simulating power-electronic-Based systems containing a wide range of time scales is presented. in this method, any suitable integration algorithm, with fixed or variable time-step, can be applied to the fast and/or slow subsystems. the subsystems exchange coupling variables at a communication interval that can be fixed or varied dynamically depending upon the state of the system variables. the proposed multirate method is applied to two example power systems that include power-electronic subsystems. Increases in simulation speed of 183-281% over established single-rate integration algorithms are demonstrated.

Effect Of Pavement Resurfacing On Traffic Safety, Kenneth R. Agent, Jerry G. Pigman, Eric R. Green

Kentucky Transportation Center Research Report

The objectives of this study were to analyze the before and after crash history and speeds on routes which have been resurfaced , inspect resurfacing projects, make recommendations to improve the resurfacing process, and determine improvements which could be made in conjunction with the resurfacing project to improve the overall safety of the roadway.

An analysis of the before and after crash data did not show a reduction in total crashes after resurfacing. There was a reduction in crashes which occurred on a wet pavement. A comparison of speeds before and after resurfacing did not find a major change in …

Connectionist Approaches To Cost-Based Abduction, Emad Abdel-Thalooth Massry Andrews

Archived Theses and Dissertations

No abstract provided.

Outside Loop Control In Asymmetrical Trimmed Flight Conditions, Gary D. Miller

Theses and Dissertations

Traditionally flight control systems have used linearized equations of motion solved around a single trim point. This thesis proposes a nested-loop controller directly solved from the equations of motion. The control equations were developed as a solution to asymmetrically trimmed flight conditions. A two-loop design was proposed for the controller. The outer loop modeled the aircraft as a point mass and all forces were balanced to find the aircraft states. The equations input the control variables and output the aircraft states. The inner-loop utilizes the six-degree of freedom model of the aircraft to solve the moment equations. With the input …

Sensitivity Analysis Of Hill Muscle Parameters, Janet Brelin-Fornari, Paras Shah, Mohamed El-Sayed

Mechanical Engineering Presentations And Conference Materials

A computational, rigid body model of a 50^th percentile male head and neck utilizing 15 Hill Muscle pairs is used to study the sensitivity of Hill Muscle Model parameters. A 15g linear acceleration is applied within the transverse plane at the lowest vertebral level of the neck (T1). The resultant linear acceleration of the head is analyzed. In response is minimally affected. The peak accelerations did change, and in the case of varying muscle activation, the peak acceleration changed significantly, 36%. Each of the other parameter variations affected the peak acceleration of the head by less than 5%. Overall, …

Access Management For Kentucky, Nikiforos Stamatiadis, Barry House, Jeremy Brickey, Donald L. Hartman, Mei Chen, Jerry G. Pigman, Kavita Boddu, Emily Elwood

Kentucky Transportation Center Research Report

The Access Management Manual published by the Transportation Research Board in 2003 defines access management as the ?systematic control of the location, spacing, design, and operation of driveways, median openings, interchanges, and street connections to a roadway1.? The purpose of access management is to provide vehicular access to land development in a manner that preserves the safety and efficiency of the transportation system. Access management principles stress mobility for higher-class roadways and safety for lower-class roadways. An effective access management program can reduce crashes as much as 50 percent, increase roadway capacity by 23 to 45 percent, and reduce travel …

Analysis Of Inconsistencies Related To Design Speed, Operating Speed, And Speed Limits, Nikiforos Stamatiadis, Huafeng Gong

Kentucky Transportation Center Research Report

The objective of this research was to examine the relationship among design speeds, operating speeds and speed limits and address safety and operational concerns regarding the presence of disparities among these speed metrics. Roadway sections were selected throughout Kentucky based on the relationship between design speed and posted speed limit (greater or lower) and on the number of lanes (2 or 4). Speed data and roadway geometry data were collected along these sites to allow for the development of the appropriate models. The general conclusion for 2-lane highways is that the operating speed is different than the design speed indicating …

Evaluation Of Fire Resistance Of Plastering Applied To Reinforced Concrete, Engy M Samy Serag

Archived Theses and Dissertations

Concrete is one of the most resistant construction materials to heat and fire. It is known to retain heat for a relatively long time, thus limiting crack propagation from penetrating deeply. Furthermore, it can be repaired if exposed to fire for a limited time. However it loses its strength dramatically when exposed to elevated temperatures for long duration. With the increase in the use of concrete in structures, a demand arises to assess the fire resistance of concrete structural members and to develop means of improving the fire characteristics of these elements. One of the methods to increase the fire …

Construction Of Shopping Malls In Egypt, Ramez Wageih Shafik

Archived Theses and Dissertations

This thesis entitled "Construction of Shopping Malls in Egypt: Reasons For Delay and Estimated Duration" was prepared by Ramez W ageih Shafik under the supervision and guidance of Dr. Samer Ezz El Din at the American University in Cairo The construction industry is one of the most important and essential industries in the economy of any country. Time delay is one of the major problems facing the construction projects in Egypt. Facing the fact that the construction of shopping malls has picked up in Egypt during the last ten years, research is needed to identify the different factors that affect …

Fatty Acid Composition And Oxidation Of Lipids In Korean Catfish, K. T. Hwang, J. E. Kim, S. G. Kang, S. T. Jung, H. J. Park, Curtis L. Weller

Department of Agricultural and Biological Systems Engineering: Faculty Publications

This study determined the lipid content and FA composition of muscle and a mixture of muscle and viscera from Korean catfish as well as lipid oxidation and hydrolysis. Lipid content and FA compositions in Korean catfish, which were purchased every month or two during September 1999–July 2000, were analyzed. Lipid oxidation and hydrolysis were determined as PV, thiobarbituric acid value, and FFA in the muscle and the mixture during storage at 2°C for 12 d and –14°C for 9 wk. Lipid contents of the muscle and the mixture were 3.2 (w/w) and 5.4%, respectively. Oleic acid was the most abundant …

A Reconfigurable Facts System For University Laboratories, Liangying Dong, Zhiping Yang, Shen Chen, Lin Zhang, Stan Atcitty, Mariesa Crow

Electrical and Computer Engineering Faculty Research & Creative Works

To fully understand the dynamic performance of the multiple flexible ac transmission systems (FACTS) devices, a hardware setup is needed to complement software simulation for university research laboratories. This paper presents the schematic and basic controls of a reconfigurable FACTS system that can be used to realize the major voltage-sourced-converter FACTS topologies: the StatCom, the static synchronous series compensator (SSSC), and the unified power-flow controller (UPFC). Furthermore, the state models and control algorithms for the FACTS devices are proposed. The digital signal processor (DSP)-based control system enables new control methods to be rapidly implemented. The comparison of the experimental and …

Pulse Regulation Control Technique For Flyback Converter, Mehdi Ferdowsi, Ali Emadi

Electrical and Computer Engineering Faculty Research & Creative Works

Pulse regulation, a fixed frequency control technique, is introduced and applied to flyback converter operating in discontinuous conduction mode (DCM). The control parameters are designed in a way that the converter operates as close as possible to the critical conduction mode. In contrast to the conventional pulse width modulation (PWM) control scheme, the principal idea of pulse regulation is to achieve output voltage regulation using high and low-power pulses. Pulse regulation is simple, cost effective, and enjoys a fast dynamic response. The proposed technique is applicable to any converter operating in DCM. However, this work mainly focuses on flyback topology. …

Ip Traceback Of Denial Of Service Attacks Using Mobile Agents Technology, Ghada Magdi Hashem El-Keissi

Archived Theses and Dissertations

Denial of Service (DoS) attack is considered a critical threat to networks. A DoS is a destructive attack aiming at denying services to legitimate users. An attacker could create an attack that floods a network, disrupts a connection between two computers, or even crashes a computer. Accordingly, legitimate users will not be able to have access to services needed. DoS attacks could originate from a single attacker or it could originate from multiple attackers creating Distributed Denial of Service (DDoS) attacks towards a target victim. One of the main problems ofDoS attacks is the ability of an attacker to forge …