Digital Commons Network^™

Parametric Modeling Of Tooling: Workpiece Interaction With Engineered Abrasives, Hitesh Kataria

Theses

Abrasive processes are some of the most important operations employed in manufacturing to remove unwanted material and introduce desired geometry and surface finish. However, some of the difficulties encountered when trying to model abrasive process are related to a multi-point of contact tooling composed of extremely hard and brittle particles which geometry, shape and distribution are unknown. With the introduction of engineered abrasives to the market over the past few years, the opportunity to drastically improve the quality and consistency of abrasive machining now exists. One of the main benefits of engineered abrasives is the ability to control the abrasive …

Techno-Whimsy, Liz Dodds

Theses

None provided.

Continuing A Study Of Place, Brian Emery

Theses

None provided.

An Automated Procedure For Simulating Complex Arrival Processes: A Web-Based Approach, Sachin Sumant

Theses

In industry, simulation is one of the most widely used probabilistic modeling tools for modeling highly complex systems. Major sources of complexity include the inputs that drive the logic of the model. Effective simulation input modeling requires the use of accurate and efficient input modeling procedures. This research focuses on nonstationary arrival processes. The fundamental stochastic model on which this study is conducted is the nonhomogeneous Poisson process (NHPP) which has successfully been used to characterize arrival processes where the arrival rate changes over time. Although a number of methods exist for modeling the rate and mean value functions that …

Twixt, Karen Schlesinger

Theses

This thesis discusses photographs exhibited at the School of Photographic Arts and Sciences Gallery at Rochester Institute of Technology from April 28 - May 10, 2003. In these photographs of desecrated landscapes at liminal times of day, the eerie light and vibrant colors of dusk and dawn enable me to create views of my personal world, a foreign and perilous place for some audiences, an intoxicating and disquieting environment for others. As the light gives way to darkness, the deepening shadows of the vegetation come alive as monstrous figures. Fears lurk in the darkness and become threatening creatures of the …

Neutron Radiography Study Of Water Transport In An Operating Fuel Cell: Effects Of Diffusion Media And Cathode Channel Properties, Jon Owejan

Theses

In a polymer electrolyte membrane fuel cell, effective water management is required for optimal cell performance. While membrane hydration is needed for effective proton conduction, an excess of water, particularly on the cathode side, hinders transport of oxygen to the catalyst sites and lowers cell voltage. This study utilized neutron radiography to reveal the presence of liquid water while operating the PEMFC. These insitu experiments investigated both rectangular and triangular flow field geometries, various flow field surface energies, and several gas diffusion media samples. Correlations were drawn between accumulated water mass and performance data collected during the imaging process. The …

Students' Self-Reported Preferences For Print And Online Newspapers, Kristin Williams

Theses

The present study investigated the self-reported print and online newspaper reading habits of students at Rochester Institute of Technology (RIT). . A survey was distributed to a convenience sampling of 87 students in August 2003. Respondents were asked to self-report their ideas, attitudes and opinions about and towards online and printed news. . The results support previous research, including a 1999 study at RIT as well as those conducted at Pennsylvania State University and by the Pew Research Center, which revealed that college students were not reading newspapers with any regularity, but still thought that keeping up with news was …

Nativity, So Young Park

Theses

None provided.

Identification And Prediction Of Nonlinear Dynamics, Andrew Dick

Theses

Chaos theory and associated analyses are being applied to a growing number of disciplines. Studies of biological and ecological systems have shown the widest application of chaotic analyses thus far. When studying these systems, it is often only possible to measure a subset of the system's many variables. To effectively perform a number of the analyses required to study a chaotic system, it is necessary to identify a complete strange attractor for the system. Consequently, it is necessary to reconstruct the system's strange attractor from the available data. Many different methods exist for reconstructing strange attractors, but the effectiveness of …

Integrating Diverse Digital Elements And Dvd Authoring To Design A Promotional Interactive Dvd Media, Kai-Yi Chen

Theses

a. Project consideration The project will be an experimental design using DVD media. Below are few factors to be considered before beginning the project. Goal: Use features of DVD media to create an interactive DVD. Value: To help users understand that interactive DVDs promote products better than traditional media. Design solutions: To find the best solutions for the project. Timeline: Define the timetable of project process. Evolution: Understand problems and revise the final project. b. Product definition: The product being promoted almost decides the entire design style in the final DVD. I had chosen the CDJ-1000, a DJ turntable. Not …

0.18 Μm Cmos Low Power Standard Cell Library, Suryadi Gunawan

Theses

With the increasing number of transistors in a single integrated circuit, power is becoming one of the major issues in integrated circuit development. This issue requires additional effort from designers in order to produce lower power designs. The purpose of this thesis is to develop a standard cell library using Taiwan Semiconductor Manufacturing Company's 0.18-micron CMOS technology. The library cells consume less power compared to the vendor library provided by MOSIS. Although a reduction in power consumption is the main objective in this cell library, the timing delay and area are two aspects that cannot be ignored. However, a sacrifice …

Biomorphic Abstractions: Exploring The Relationship Between Two Dimensional And Three Dimensional Art Forms, Paula Crawford

Theses

None provided.

Seeing, Sensing, And Selection: Modeling Visual Perception In Complex Environments, Roxanne Canosa

Theses

The purpose of this thesis is to investigate human visual perception at the level of eye movements by describing the interaction between vision and action during natural, everyday tasks in a real-world environment. The results of the investigation provide motivation for the development of a biologically-based model of selective visual perception that relies on the relative perceptual conspicuity of certain regions within the field of view. Several experiments were designed and conducted that form the basis for the model. The experiments provide evidence that the visual system is not passive, nor is it general-purpose, but rather it is active and …

A Manufacturing Execution System Using Siemens' Pc Based Automation Technology, Prakash Gandhi

Theses

The focus of any manufacturing operation is to establish better yields, reduced cycle times, increase quality, and handle dynamic demand/resource fluctuations. Over the past few years many manufacturing companies have implemented Enterprise Resource Planning (ERP) systems and they have proved themselves to be successful in achieving these goals. However, real-time data is required in order to portray an accurate account of the day-to-day and/or hourly product manufacturing operations. Retrieval of this real-lime data is a challenging task. A Manufacturing Execution System (MES) is a real-time information system that improves the performance of the shop floor operations by linking business planning, …

A Simulation Study Of Dispatching Rules And Rework Strategies In Semiconductor Manufacturing, Gregory Laubisch

Theses

The semiconductor industry is fast paced and on the cutting edge of technology, resulting in very short life spans of semiconductor products. In order to stay competitive, manufacturers must be able to quickly adapt to produce new products, and they must achieve a high level of productivity. Two major operational components of semiconductor fabrication plants (fabs) that effect productivity are dispatching rules and rework strategies. Although prior research has been conducted independently on these two issues, the hypothesis is that the interrelationship between the dispatching rules and rework strategies has a significant effect on the productivity of the fab. Moreover, …

Kinetic And Analytical Studies On Catalytic And Noncatalytic Oxidative Degradation Of Some Hazardous Organic Dyes Using Hydrogen Peroxide, Salem Hmoud Salem Al-Ameri

Theses

Dyes have become a very important part to countless modem applications. As a result of this huge consumption of dyes in manufacturing processes, huge amounts of wastewater contaminated with dyes are released into different natural dumps like rivers and seas. These dyes contaminated wastes have dangerous impacts on the environment and toxic affects. Two problems are facing scientists concerned about this environmental task. First, dyes vary in their chemical and physical natures and different waste treatments are needed which sometime are not available. Second, getting rid of these pollutants from its sources is costly, that many manufactures can not afford. …

Effects Of Operator Training Method On Knowledge Retention On A Common Cnc Machine Interface, Phillip Rogerson

Theses

The continued growth of computer numerically controlled (CNC) machine tool use in industry combined with increased competition in the global market requires workers to quickly attain requisite skills and raise productivity levels to meet production demands. Retention of knowledge is a key factor in an operator's ability to transfer training into actual machine operation in a production setting. This study examines the difference in short term retention of knowledge necessary to perform basic interface operations in operators trained using a conventional training method compared to those trained using a train-to-criteria method.

Experimental Study Of Heat Transfer, Pressure Drop, And Critical Heat Flux In An Oil Heated Minichannel, Levi Campbell

Theses

Heat transfer, pressure drop, and critical heat flux are experimentally recorded for flowing water in a single 706 pm circular copper channel 158.75 mm long. Heat is supplied by heat transfer oil at specified temperatures to a helical channel in the test section. In contrast to other current experimental techniques for flow boiling in small diameter tubes, a uniform temperature boundary condition is employed rather than a constant heat flux condition. The principal results of these experiments are two-phase flow boiling heat transfer rates, a comparison of two data acquisition methods and their effect on the value of CHF, and …

At The Dark End Of Eros: The Dark Side Of Love And Desire, Chia-Wen Hsieh

Theses

Exploration of the dark side of human intimacy and sexuality in the author's paintings and cinematography.

Transport Properties Of Nc-Si / A-Sio2 Superlattices And Their Applications In Non-Volatile Memory, Lakshmi Susmitha Koneru

Theses

The dc current-voltage characteristics, ac conductivity, equivalent capacitance, photocurrent transients of the n-Si/nanocrystalline-Si/amorphous-SiO₂/Al heterostructure were measured in a wide range of illumination intensities for temperatures from 4.2 K to 300 K. Electrical transport properties of the nanocrystalline-Si/amorphous-SiO₂ superlattices were discussed. The observed domination of the electron component at negative bias and of the hole component at positive bias above 0.7 V in a dc current allows to separate transport features of electrons and holes in a nc-Si/a-SiO₂ superlattices. Transport of electrons is thermally activated if potential barrier at c-Si/SL interface of 70 meV is suppressed and …

Elastic Brain Image Registration Using Mutual Information, Srisheela Devabhaktuni

Theses

Image Registration is the determination of a geometrical transformation that aligns points in one image of an object with corresponding points in another image. The source image is geometrically transformed to match the target image. The geometric transformation can be rigid or non-rigid. Rigid transformations preserve straight lines and angles between straight lines. The basic rigid transformations are rotation, scaling and translation.

In this thesis non-rigid registration using B-splines is the method being used to take into account the elastic change in the brain structure. The B-spline equation is a type of curved transformation that does not preserve the straightness …

A Combined Channel-Modified Adaptive Array Mmse Canceller And Viterbi Equalizer, Richard M. Friedman

Theses

In this thesis, a very simple scheme is proposed which couples a maximum-likelihood sequence estimator (MLSE) with a X-element canceller. The method makes use of the MLSE's channel estimator to modify the locally generated training sequence used to calculate the antenna array weights. This method will increase the array's degree of freedom for interference cancellation by allowing the dispersive, desired signal to pass through the array undisturbed. Temporal equalization of the desired signal is then accomplished using maximum-likelihood sequence estimation. The T-spaced channel estimator coefficients and the array weights are obtained simultaneously using the minimum mean square error criteria. The …

An Experimental Study On Network Intrusion Detection Systems, Peng Fu

Theses

A signature database is the key component of an elaborate intrusion detection system. The efficiency of signature generation for an intrusion detection system is a crucial requirement because of the rapid appearance of new attacks on the World Wide Web. However, in the commercial applications, signature generation is still a manual process, which requires professional skills and heavy human effort. Knowledge Discovery and Data Mining methods may be a solution to this problem. Data Mining and Machine Learning algorithms can be applied to the network traffic databases, in order to automatically generate signatures.

The purpose of this thesis and the …

Synthesis Of Nano/Micro Particles Using Supercritical Method And Particle Characterization, Abhijit Aniruddha Gokhale

Theses

The thesis work consists of the two parts, jet behavior of solvents (ethanol and acetone) and the particle formation using SAS method. In the first part, the study of the effects of process parameters like temperature, pressure, injection velocity and internal diameter of nozzle on liquid jets are studied. The critical pressure for which liquid jet of solvents changes to gas - like jet, is investigated.

In the second part, the experiments are done to study the process of the particle formation using SAS method. Effects of process parameters like pressure, injection velocity of solution, the inner diameter of nozzle …

The Influence Of Exercise On Oxygen Uptake In Mild Hypertension, Matthew Joseph Herban

Theses

The amount of oxygen used by muscle cells increase with exercise. The two body systems that influence the amount of oxygen delivered are the cardiovascular system and the pulmonary system. Two groups of patients were studied, those that were mildly hypertensive (but are not taking prescription medication for hypertension) and the control or normal group. The two groups exercised on a bicycle ergometer. Work rate was increased in steps (multiples of thirty watts) until anaerobic threshold (as measured by an ear oximeter) was reached. Heart rate, blood pressure, oxygen uptake and carbon dioxide production were measured during exercise. Their data …

Tree Based Reliable Topology For Distributing Link State Information, Ram Narayan Krishnan

Theses

Finding paths that satisfy the performance requirements of applications according to link state information in a network is known as the Quality-of- Service (QoS) routing problem and has been extensively studied. However, distributing link state information may introduce a significant protocol overhead on network resources. In this thesis, the issue on how to update link state information efficiently and effectively is investigated. A theoretical framework is presented, and a high performance link state policy that is capable of minimizing the false blocking probability of connections under a given update rate constraint is proposed. Through theoretical analysis, it is shown that …

Face Recognition Using Principal Component Analysis, Timothy Kevin Larkin

Theses

Current methods of face recognition use linear methods to extract features. This causes potentially valuable nonlinear features to be lost. Using a kernel to extract nonlinear features should lead to better feature extraction and, therefore, lower error rates. Kernel Principal Component Analysis (KPCA) will be used as the method for nonlinear feature extraction. KPCA will be compared with well known linear methods such as correlation, Eigenfaces, and Fisherfaces.

Internet Traffic Over Wide Area Network - Statistical Modeling And Analysis, Yan Yi Lee

Theses

This thesis provides results on trace data collecting and modeling of the Internet traffic over a Wide Area Network. The study is based on extensive data, gathered by tracing the actual packet exchange at the interfaces of devices on the WAN of BCCLS (Bergen County Cooperative Library System). A powerful network monitoring system WhatsUp Gold was employed to monitor the WAN, and logged the byte rates and packet rates sent and received at the interfaces. Different statistical distributions were employed to model the data traces. In comparison with some other statistical models - normal, lognormal, Weibull, and Pareto, which are …

Deposition And Characterization Of Laser-Ablated Silicon, Wenwen Luo

Theses

Laser ablation is a powerful thin film deposition and material processing technology. In the Nonlinear Nanostructure Lab at NJIT, silicon films deposited by laser ablation have been studied for the potential applications in nonlinear optoelectronic devices. The previous studies have suggested that the deposited silicon has a hexagonal symmetry, being a polymorph of silicon that previously has been obtained only at very high pressure. This thesis is part of the continuous study and characterization of this new structure. The objective of the research was to gain better understanding of the hexagonal silicon properties as well as the mechanism that lead …

Service Differentiation In Multihop Wireless Packet Networks, Ilker Onat

Theses

This work explores the potential of link layer scheduling combined with MAC layer prioritization for providing service differentiation in multihop wireless packet networks. As a result of limited power, multihop characteristic and mobility, packet loss ratio in wireless ad hoc networks tends to be high compared to wireline and one-hop mobile data networks. Therefore, for wireless ad hoc networks, DiffServ-like distributed service differentiation schemes are more viable than hard QoS solutions, which are mainly designed for wireline networks. The choice and implementation of proper queuing and scheduling methods, which determine how packets will use the channel when bandwidth becomes available, …