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2005

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Articles 2881 - 2910 of 3074

Full-Text Articles in Engineering

Design Concepts And Process Analysis For Transmuter Fuel Manufacturing, Georg F. Mauer Jan 2005

Design Concepts And Process Analysis For Transmuter Fuel Manufacturing, Georg F. Mauer

Fuels Campaign (TRP)

The safe and effective manufacturing of actinide-bearing fuels for any transmutation strategy requires that the entire manufacturing process be contained within a shielded hot cell environment. To ensure that the fabrication process is feasible, the entire process must be designed for remote operation. The equipment must be reliable enough to perform over several decades, and also easy to maintain or repair remotely. The facility must also be designed to facilitate its own decontamination and decommissioning. In addition to these design factors, the potential viability of any fuel fabrication process will also be impacted by a number of variables, such as …

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Concepts Learning Using Technology For Rapid Feedback And Student Engagement, John Chen, Jennifer A. Kadlowec, Dexter C. Whittinghill Jan 2005

Concepts Learning Using Technology For Rapid Feedback And Student Engagement, John Chen, Jennifer A. Kadlowec, Dexter C. Whittinghill

Mechanical Engineering

In this project our goal is to improve student learning in the foundation mechanics course Statics. In this case improved learning is defined as knowledge retention (durability) and knowledge application in a different environment (transferability). We aim to do this by providing rapid feedback to students of their understanding of key concepts and skills being presented. The feedback system acts as the focal point and catalyst to encourage students to assist each other in correcting misconceptions or deepening each other’s understanding of the topic or skill at hand. Furthermore, the system allows the professor to assess the students’ level of …

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Using Technology For Concepts Learning And Rapid Feedback In Statics, John Chen, Jennifer A. Kadlowec, Dexter C. Whittinghill Jan 2005

Using Technology For Concepts Learning And Rapid Feedback In Statics, John Chen, Jennifer A. Kadlowec, Dexter C. Whittinghill

Mechanical Engineering

In this project our goal is to improve student learning in the foundation mechanics course Statics as well as improve knowledge retention (durability) and knowledge application in a different environment (transferability). We aim to do this by providing rapid feedback to students of their understanding of key concepts and skills being presented. The feedback system acts as the focal point and catalyst to encourage students to assist each other in correcting misconceptions or deepening each other’s understanding of the topic or skill at hand. Furthermore, the system allows the professor to assess the students’ level of comprehension (or misconception) in …

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Emerging From Engineering Education – Building A Remotely Operated Submarine, Hong Zhang, Bernard Pietrucha, John Chen Jan 2005

Emerging From Engineering Education – Building A Remotely Operated Submarine, Hong Zhang, Bernard Pietrucha, John Chen

Mechanical Engineering

In spring 2004, the Department of Mechanical Engineering of Rowan University offered a new course called “Emerging Topic – Designing and Building a Remotely Operated Vehicle (ROV)”. It is a project-based course where students are required to design, build and operate a submersible with provided materials. This course integrated many engineering aspects into one project and also exposed mechanical engineering students to Mechatronics. The course was welcomed by students and the response from them was quite positive.

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Development Of A Flying Eye: A Project-Based Learning Experience, Sema E. Alptekin, Dianne Deturris, Daniel J. Macy, Jon E. Ervin Jan 2005

Development Of A Flying Eye: A Project-Based Learning Experience, Sema E. Alptekin, Dianne Deturris, Daniel J. Macy, Jon E. Ervin

Industrial and Manufacturing Engineering

The paper describes the design for manufacturability of a prototype product as part of a manufacturing engineering capstone course. The product chosen was a vertically launched unmanned aerial vehicle (UAV)—the “Flying Eye.” The Flying Eye is an autonomous parafoil surveillance platform quipped with sensors, controllers, mechanical components, and software. Once the autonomous UAV is deployed, it is designed to follow a predetermined flight path down to the ground. The design effort of the prototype device took place over a three-year period as a collaborative effort between the Aerospace Engineering and Industrial and Manufacturing Engineering departments at California Polytechnic State University. …

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Drum Source Separation Using Percussive Feature Detection And Spectral Modulation, Dan Barry, Derry Fitzgerald, Eugene Coyle, Robert Lawlor Jan 2005

Drum Source Separation Using Percussive Feature Detection And Spectral Modulation, Dan Barry, Derry Fitzgerald, Eugene Coyle, Robert Lawlor

Conference papers

This papers presents a method for the separation and resynthesis of drum sources from single channel polyphonic mixtures. The frequency domain technique involves identifying the presence of a drum using a novel percussive feature detection function, after which the short-time magniture spectrum is estimated and scaled according to an estimated time-amplitude function derived from the percussive measure. In addition to producing high quality separation results, the method described is also a useful pre-process for drum transcription techniques such as Prior Subspace Analysis in the presence of pitched instruments.

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Comparison Of Signal Reconstruction Methods For The Azimuth Discrimination And Resynthesis Algorithm, Dan Barry, Robert Lawlor, Eugene Coyle Jan 2005

Comparison Of Signal Reconstruction Methods For The Azimuth Discrimination And Resynthesis Algorithm, Dan Barry, Robert Lawlor, Eugene Coyle

Conference papers

The Azimuth Discrimination and Resynthesis algorithm (ADRess) has been shown to produce high quality sound source separation results for intensity panned stereo recordings. There are however, artifacts such as phasiness which become apparent in the separated signals under certain conditions. This is largely due to the fact that only the magnitude spectra for the separated sources are estimated. Each source is then resynthesised using the phase information obtained from the original mixture. This paper describes the nature and origin of the associated artifacts and proposes alternative techniques for resynthesising the separated signals. A comparison of each technque is then presented.

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Audio Time-Scale Modification Using A Hybrid Time-Frequency Domain Approach, David Dorran, Eugene Coyle, Robert Lawlor Jan 2005

Audio Time-Scale Modification Using A Hybrid Time-Frequency Domain Approach, David Dorran, Eugene Coyle, Robert Lawlor

Conference papers

Frequency-domain approaches to audio time-scale modification introduce a reverberant artefact into the time-scaled output due to a loss in phase coherence between subband components. Whilst techniques have been developed which reduce the presence of this artifact, it remains a source of difficulty. A method of time-scaling is presented that reduces the presence of the reverberation by taking advantage of some flexibility that exists in the choice of phase required so as to maintain horizontal phase coherence along frequency-domain subband components. The approach makes use of appealing aspects of existing time-domain and frequency-domain time-scaling techniques.

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Multi Pitch Estimation By Using Iir Comb Filters, Mikel Gainza, Robert Lawlor, Eugene Coyle Jan 2005

Multi Pitch Estimation By Using Iir Comb Filters, Mikel Gainza, Robert Lawlor, Eugene Coyle

Conference papers

A technique for detecting the pitches of a polyphonic signal is presented. The system utilises modified IIR comb filters, which are generated to ensure that a null (stop band notches) exists at multiples of note frequencies and that a very flat pass band is present in the remain of the spectrum. Thus, the signal spectrum is not distorted after applying the filters to the audio signal, which is the case when using FIR comb filters. the presented approach improves upon an existing multi pitch detection model based on a FIR comb filter framework.

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Multi-Channel Audio Time-Scale Modification, David Dorran, Robert Lawlor, Eugene Coyle Jan 2005

Multi-Channel Audio Time-Scale Modification, David Dorran, Robert Lawlor, Eugene Coyle

Conference papers

Phase vecoder based approaches to audio time-scale modification introduce a reverberant artefact into the time scaled output. Recent techniques have been developed to reduce the presence of this artefact; however, these techniques have the effect of introducing additional issues relating to their application to multi-channel recordings. This paper addresses these issues by collectively analysing all channels prior to time-scaling each individual channel.

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Design Of A Satellite Cluster System In Distributed Simulation, Jong Sik Lee, Thong Luu, Vijaya K. Konangi Jan 2005

Design Of A Satellite Cluster System In Distributed Simulation, Jong Sik Lee, Thong Luu, Vijaya K. Konangi

Electrical and Computer Engineering Faculty Publications

This article presents the design and development of a satellite cluster system that supports an interfederation communication in High Level Architecture (HLA)-compliant distributed simulation. The interfederation communication enables the execution of a complex, large-scale cluster system of distributed satellites that share the dispersed data assets among satellite components collaboratively. After a brief review of the HLA bridge for interfederation communication, the authors discuss the design issues related to a satellite cluster system that provides cluster management, interfederation communication, and communication data management. They analyze system performance and scalability for centralized and decentralized configurations. The empirical results on the heterogeneous …

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Unification Of Transactions And Replication In Three-Tier Architectures Based On Corba, Wenbing Zhao, Louise E. Moser, P. Michael Melliar-Smith Jan 2005

Unification Of Transactions And Replication In Three-Tier Architectures Based On Corba, Wenbing Zhao, Louise E. Moser, P. Michael Melliar-Smith

Electrical and Computer Engineering Faculty Publications

In this paper, we describe a software infrastructure that unifies transactions and replication in three-tier architectures and provides data consistency and high availability for enterprise applications. The infrastructure uses transactions based on the CORBA object transaction service to protect the application data in databases on stable storage, using a roll-backward recovery strategy, and replication based on the fault tolerant CORBA standard to protect the middle-tier servers, using a roll-forward recovery strategy. The infrastructure replicates the middle-tier servers to protect the application business logic processing. In addition, it replicates the transaction coordinator, which renders the two-phase commit protocol nonblocking and, thus, …

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Power Analysis And Optimization Techniques For Energy Efficient Computer Systems, Wissam Chedid, Chansu Yu, Ben Lee Jan 2005

Power Analysis And Optimization Techniques For Energy Efficient Computer Systems, Wissam Chedid, Chansu Yu, Ben Lee

Electrical and Computer Engineering Faculty Publications

Reducing power consumption has become a major challenge in the design and operation of to-day’s computer systems. This chapter describes different techniques addressing this challenge at different levels of system hardware, such as CPU, memory, and internal interconnection network, as well as at different levels of software components, such as compiler, operating system and user applications. These techniques can be broadly categorized into two types: Design time power analysis versus run-time dynamic power management. Mechanisms in the first category use ana-lytical energy models that are integrated into existing simulators to measure the system’s power consumption and thus help engineers to …

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Design And Assessment Of Compact Optical Systems Towards Special Effects Imaging, Vesselin Chaoulov Jan 2005

Design And Assessment Of Compact Optical Systems Towards Special Effects Imaging, Vesselin Chaoulov

Electronic Theses and Dissertations

A main challenge in the field of special effects is to create special effects in real time in a way that the user can preview the effect before taking the actual picture or movie sequence. There are many techniques currently used to create computer-simulated special effects, however current techniques in computer graphics do not provide the option for the creation of real-time texture synthesis. Thus, while computer graphics is a powerful tool in the field of special effects, it is neither portable nor does it provide work in real-time capabilities. Real-time special effects may, however, be created optically. Such approach …

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Modeling And Simulation Of Long Term Degradation And Lifetime Of Deep-Submicron Mos Device And Circuit, Zhi Cui Jan 2005

Modeling And Simulation Of Long Term Degradation And Lifetime Of Deep-Submicron Mos Device And Circuit, Zhi Cui

Electronic Theses and Dissertations

Long-term hot-carrier induced degradation of MOS devices has become more severe as the device size continues to scale down to submicron range. In our work, a simple yet effective method has been developed to provide the degradation laws with a better predictability. The method can be easily augmented into any of the existing degradation laws without requiring additional algorithm. With more accurate extrapolation method, we present a direct and accurate approach to modeling empirically the 0.18-ìm MOS reliability, which can predict the MOS lifetime as a function of drain voltage and channel length. With the further study on physical mechanism …

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Tunable Liquid Crystal Photonic Devices, Yun-Hsing Fan Jan 2005

Tunable Liquid Crystal Photonic Devices, Yun-Hsing Fan

Electronic Theses and Dissertations

Liquid crystal (LC)-based adaptive optics are important for information processing, optical interconnections, photonics, integrated optics, and optical communications due to their tunable optical properties. In this dissertation, we describe novel liquid crystal photonic devices and their fabrication methods. The devices presented include inhomogeneous polymer-dispersed liquid crystal (PDLC), polymer network liquid crystals (PNLC) and phase-separated composite film (PSCOF). Liquid crystal/polymer composites could exist in different forms depending on the fabrication conditions. In Chap. 3, we demonstrate a novel nanoscale PDLC device that has inhomogeneous droplet size distribution. In such a PDLC, the inhomogeneous droplet size distribution is obtained by exposing the …

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An Automated Methodology For A Comprehensive Definition Of The Supply Chain Using Generic Ontological Components, Mohamed Fayez Jan 2005

An Automated Methodology For A Comprehensive Definition Of The Supply Chain Using Generic Ontological Components, Mohamed Fayez

Electronic Theses and Dissertations

Today, worldwide business communities are in the era of the Supply Chains. A Supply Chain is a collection of several independent enterprises that partner together to achieve specific goals. These enterprises may plan, source, produce, deliver, or transport materials to satisfy an immediate or projected market demand, and may provide the after sales support, warranty services, and returns. Each enterprise in the Supply Chain has roles and elements. The roles include supplier, customer, or carrier and the elements include functional units, processes, information, information resources, materials, objects, decisions, practices, and performance measures. Each enterprise, individually, manages these elements in addition …

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Formalization Of Input And Output In Modern Operating Systems: The Hadley Model, Matthew Gerber Jan 2005

Formalization Of Input And Output In Modern Operating Systems: The Hadley Model, Matthew Gerber

Electronic Theses and Dissertations

We present the Hadley model, a formal descriptive model of input and output for modern computer operating systems. Our model is intentionally inspired by the Open Systems Interconnection model of networking; I/O as a process is defined as a set of translations between a set of computer-sensible forms, or layers, of information. To illustrate an initial application domain, we discuss the utility of the Hadley model and a potential associated I/O system as a tool for digital forensic investigators. To illustrate practical uses of the Hadley model we present the Hadley Specification Language, an essentially functional language designed to allow …

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Spray Cooling For Land, Sea, Air And Space Based Applications, A Fluid Managment System For Multiple Nozzle Spray Cooling And A Guide To High Heat Flux Heater Design, Brian Glassman Jan 2005

Spray Cooling For Land, Sea, Air And Space Based Applications, A Fluid Managment System For Multiple Nozzle Spray Cooling And A Guide To High Heat Flux Heater Design, Brian Glassman

Electronic Theses and Dissertations

This thesis is divided into four distinct chapters all linked by the topic of spray cooling. Chapter one gives a detailed categorization of future and current spray cooling applications, and reviews the major advantages and disadvantages that spray cooling has over other high heat flux cooling techniques. Chapter two outlines the developmental goals of spray cooling, which are to increase the output of a current system and to enable new technologies to be technically feasible. Furthermore, this chapter outlines in detail the impact that land, air, sea, and space environments have on the cooling system and what technologies could be …

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Automatic Particle Counting Using An Acoustic Transducer, George Haddad Jan 2005

Automatic Particle Counting Using An Acoustic Transducer, George Haddad

Electronic Theses and Dissertations

Aerosol particle detection and determination finds important applications in the commercial, military and aerospace sectors. Monitoring of clean room environments, and spacecraft integration and check out facilities are some of the most important aplications. In the early days test filters were examined with a microscope to determine the number and size of particles that were being removed from air. Today, most of the commercially available clean room airborne particle counters work on a light scattering principle. They are referred to as Optical Particle Counter or OPC. Essentially, they utilize a very bright laser light source to illuminate the particles. The …

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Navigation Aids In Route Training: Increase Navigation Speed, Decrease Route Retention?, John Holmquist Jan 2005

Navigation Aids In Route Training: Increase Navigation Speed, Decrease Route Retention?, John Holmquist

Electronic Theses and Dissertations

In the case of one car following another to a destination, it is very effective at getting the second vehicle to the destination quickly; however, the driver of the second car may not learn the route. Yet, for individuals, such as firefighters, law enforcement, and military personnel, it is imperative that a route be learned quickly and accurately and that an awareness of the situation is maintained while they traverse the given route. This leads to three questions, (a) will navigation aids affect initial route navigation; (b) will navigation aids affect retention; and (c) will navigation aids affect situation awareness …

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Development Of A Motor Speed Control System Using Matlab And Simulink, Implemented With A Digital Signal Processor, Andrew Klee Jan 2005

Development Of A Motor Speed Control System Using Matlab And Simulink, Implemented With A Digital Signal Processor, Andrew Klee

Electronic Theses and Dissertations

This thesis describes an improved methodology for embedded software development. MATLAB and Simulink allow engineers to simplify algorithm development and avoid duplication of effort in deploying these algorithms to the end hardware. Special new hardware targeting capabilities of MATLAB and Simulink are described in detail. A motor control system design served to demonstrate the efficacy of this new method. Initial data was collected to help model the motor in Simulink. This allowed for the design of the open and closed loop control systems. The designed system was very effective, with good response and no steady state error. The entire design …

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Effects Of Bedding Void On Internal Moment Increase In Concrete Pipes, Jad Kazma Jan 2005

Effects Of Bedding Void On Internal Moment Increase In Concrete Pipes, Jad Kazma

Electronic Theses and Dissertations

Large diameter concrete pipes have been used in many areas of central Florida to carry pressured sewage flow. These pipes have been typically located at six feet below finished roadway elevation, and ranges in diameter from thirty six to sixty inches. The water table is typically located at shallow depth below finished roadway elevation, and generally fluctuates between five to ten feet depending on the relative roadway elevation to mean sea level. These pipes are under pressure when carrying the sewage flow, but return to normal atmospheric pressures when the flow stops. Since the water table encases most of the …

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Cryogenic Shape Memory Alloy Actuators For Spaceport Technologies: Materials Characterization And Prototype Testing, Jennifer Lemanski Jan 2005

Cryogenic Shape Memory Alloy Actuators For Spaceport Technologies: Materials Characterization And Prototype Testing, Jennifer Lemanski

Electronic Theses and Dissertations

Shape memory alloys (SMAs) possess the unique ability to change their shape by undergoing a solid-state phase transformation at a particular temperature. The shape change is associated with a large strain recovery as the material returns to its "remembered" shape. Their ability to act as both sensor and actuator has made them an attractive subject of study for numerous applications. SMAs have many characteristics which are advantageous in space-related applications, including generation of large forces associated with the strain recovery, smooth and controlled movements, large movement to weight ratio, high reliability, and spark-free operation. The objective of this work is …

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Self-Assembled Supramolecular Structures Of Chiral Phospholipids: Structure, Mechanical Properties And Patterning, Nidhi Mahajan Jan 2005

Self-Assembled Supramolecular Structures Of Chiral Phospholipids: Structure, Mechanical Properties And Patterning, Nidhi Mahajan

Electronic Theses and Dissertations

Lipid molecule is well known natural building block to form different supramolecular structures with specific shape, size and functionality. In my thesis work, I have used DC8,9PC 1,2-bis(tricosa-10,12-dinoyl)-sn-glycero-3-phosphocholine), a type of chiral lipid to form the vesicles, tubules and ribbons . By using Atomic Force Microscope, I have studied the morphological features of these particular structures. Also, the mechanical properties of lipid tubules have been studied using AFM. Softlithography has been used to pattern the lipid vesicles and tubules into 2-dimensional and 3-dimensional ordered arrays. The structure of self-assembled hollow spherical vesicles was studied using AFM. The applications of soft …

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A Dynamic Model Of The Human/Cooling System/Clothing/Environment System, Zhengxiang Pu Jan 2005

A Dynamic Model Of The Human/Cooling System/Clothing/Environment System, Zhengxiang Pu

Electronic Theses and Dissertations

The human body compensates well for moderate climatic heat stress, but artificial environments often block or overwhelm physiological defense mechanism. Personal protective equipment (PPE) is one of sources of heat stress. It protects individual from chemical, physical, or biological hazards, but the high thermal insulation and low vapor permeability of PPE may also lead to substantial heat stress. Personal cooling is widely used to alleviate heat stress, especially for those situations where ambient environmental cooling is not economically viable or feasible. It is important to predict the physiological responses of a person wearing PPE with personal cooling to make sure …

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Differential Radio Link Protocol: An Improvement To Tcp Over Wireless Networks, Jaideep Sarkar Jan 2005

Differential Radio Link Protocol: An Improvement To Tcp Over Wireless Networks, Jaideep Sarkar

Electronic Theses and Dissertations

New generations of wireless cellular networks, including 3G and 4G technologies, are envisaged to support more mobile users and a variety of wireless multimedia services. With an increasing demand for wireless multimedia services, the performance of TCP becomes a bottleneck as it cannot differentiate between the losses due to the nature of air as a medium and high data load on the network that leads to congestion. This misinterpretation by TCP leads to a reduction in the congestion window size thereby resulting in reduced throughput of the system. To overcome this scenario Radio Link Protocols are used at a lower …

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Famtile: An Algorithm For Learning High-Level Tactical Behavior From Observation, Brian Stensrud Jan 2005

Famtile: An Algorithm For Learning High-Level Tactical Behavior From Observation, Brian Stensrud

Electronic Theses and Dissertations

This research focuses on the learning of a class of behaviors defined as high-level behaviors. High-level behaviors are defined here as behaviors that can be executed using a sequence of identifiable behaviors. Represented by low-level contexts, these behaviors are known a priori to learning and can be modeled separately by a knowledge engineer. The learning task, which is achieved by observing an expert within simulation, then becomes the identification and representation of the low-level context sequence executed by the expert. To learn this sequence, this research proposes FAMTILE - the Fuzzy ARTMAP / Template-Based Interpretation Learning Engine. This algorithm attempts …

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Integration Of Real-Time Experiments With Internet Access, Pavan Talakala Jan 2005

Integration Of Real-Time Experiments With Internet Access, Pavan Talakala

Electronic Theses and Dissertations

The revolution of Internet – enabled instrumentation is emerging as a revolution in Measurement and Automation. New standards are being developed for transmitting data and connecting instruments to the Internet. The main purpose of this thesis is to design and develop a system to Integrate various Real – time experiments and be able to monitor and control them over Internet using LabVIEW. LabVIEW is a graphical programming package capable of data acquisition, data analysis, data presentation and real time remote control. In this thesis a Real – time system is developed which integrates several real time experiments and remote control …

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Developing An Object-Oriented Approach For Operations Simulation In Speedes, Amit Wasadikar Jan 2005

Developing An Object-Oriented Approach For Operations Simulation In Speedes, Amit Wasadikar

Electronic Theses and Dissertations

Using simulation techniques, performance of any proposed system can be tested for different scenarios with a generated model. However, it is difficult to rapidly create simulation models that will accurately represent the complexity of the system. In recent years, Object-Oriented Discrete-Event Simulation has emerged as the potential technology to implement rapid simulation schemes. A number of software based on programming languages like C++ and Java are available for carrying out Object Oriented Discrete-Event Simulation. These software packages establish a general framework for simulation in computer programs, but need to be further customized for desired end-use applications. In this thesis, a …

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