Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Louisiana State University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 10351 - 10380 of 11944

Full-Text Articles in Entire DC Network

Micellar Electrokinetic Remediation Of Tnt From Soil., Mohd Raihan Taha Jan 1996

Micellar Electrokinetic Remediation Of Tnt From Soil., Mohd Raihan Taha

LSU Historical Dissertations and Theses

An assessment of the feasibility of micellar electrokinetic (EK) remediation of TNT from soils is presented. Batch solubilization tests and bench scale EK tests were conducted to select the best candidate surfactant and to evaluate the efficiency of removal of TNT from a real world soil. From batch tests, it was found that SDS gave the best desorption results among a group of candidate surfactants, which includes DOWFAX 8390 (anionic), Tween 80 and Brij 35 (nonionic) and CTAB and CTAC (cationic). Unenhanced and surfactant enhanced EK tests was unable to move substantial amounts of TNT across the specimen to the …

Go to article

Modeling Physical And Chemical Nonequilibrium Transport Of Herbicide In Soils From Different Tillage Systems., Shikui Xue Jan 1996

Modeling Physical And Chemical Nonequilibrium Transport Of Herbicide In Soils From Different Tillage Systems., Shikui Xue

LSU Historical Dissertations and Theses

The physical and chemical nonequilibrium transport of alachlor were studied in a surface Gigger soil from different tillages through tracer studies, and batch and miscible displacement experiments. Batch experiments indicated initially fast reaction followed by slow adsorption. Adsorption and desorption results indicated time dependent hysteretic behavior and was best described by a multireaction model incorporating nonlinear equilibrium reaction, a reversible kinetic mechanism, and a consecutive irreversible mechanism. The model predicted alachlor hysteresis and adsorption-desorption kinetics satisfactorily based on parameters obtained from adsorption experiments. Tracer (Eosin Y and Blue FCF dyes) studies showed non-uniformly stained areas in undisturbed soil cores (6.4 …

Go to article

Pilot-Scale Solvent Sublation For The Removal Of Hydrophobic Compounds From Wastewaters., Jeffrey Scott Smith Jan 1996

Pilot-Scale Solvent Sublation For The Removal Of Hydrophobic Compounds From Wastewaters., Jeffrey Scott Smith

LSU Historical Dissertations and Theses

Solvent sublation is a nonfoaming adsorptive bubble process which exploits the surface active nature of organic compounds in their removal from aqueous systems. Gas bubbles are introduced into an aqueous media and are buoyed upward to an immiscible organic solvent. As the bubbles rise, organic materials are selectively adsorbed from the aqueous phase and transported to the overlying, quiescent solvent layer. This dissertation studied three-phase, continuous solvent sublation of pyrene and pentachlorophenol from simulated wastewater at the pilot-scale. Steady-state removal efficiencies as high as 96% for pyrene and 94% for pentachlorophenol were demonstrated and were significantly greater than the corresponding …

Go to article

Robust Sensor Fusion Algorithms: Calibration And Cost Minimization., Richard Ree Brooks Jan 1996

Robust Sensor Fusion Algorithms: Calibration And Cost Minimization., Richard Ree Brooks

LSU Historical Dissertations and Theses

A system reacting to its environment requires sensor input to model the environment. Unfortunately, sensors are electromechanical devices subject to physical limitations. It is challenging for a system to robustly evaluate sensor data which is of questionable accuracy and dependability. Sensor fusion addresses this problem by taking inputs from several sensors and merging the individual sensor readings into a single logical reading. The use of heterogeneous physical sensors allows a logical sensor to be less sensitive to the limitations of any single sensor technology, and the use of multiple identical sensors allows the system to tolerate failures of some of …

Go to article

Fluorescence Polarization Studies: A Global View Of Molecular Photoionization Dynamics Over An Extended Energy Range., Romith Ranjan Das Jan 1996

Fluorescence Polarization Studies: A Global View Of Molecular Photoionization Dynamics Over An Extended Energy Range., Romith Ranjan Das

LSU Historical Dissertations and Theses

The experimental technique of measuring the degree of polarization of the fluorescence from electronically excited molecular ions is used to determine the alignment of N$\sb2$, CO and N$\sb2$O photoions over an extended range of excitation energy. The polarization of $\rm CO\sp+(B\sp2\Sigma\sp+\to\ X\sp2\Sigma\sp+),\ N\sb2\sp+(B\sp2\Sigma\sb{u}\sp+\ \to \ X\sp2\Sigma\sb{g}\sp+)$, and $\rm N\sb2O\sp+\ (A\sp2\Sigma\sp+\ \to\ X\sp2\Pi)$ fluorescence over a 200 eV photon energy range is used to interpret the oscillator strength distributions for normally unresolved degenerate ionization channels. The results show the influence of a CO $4\sigma\to k\sigma$ shape resonance clearly, and agreement between theory and experiment is excellent. The N$\sb2$O experimental results indicate …

Go to article

Applications Of Grobner Bases To Linear Codes., Jeanne Fitzgerald Jan 1996

Applications Of Grobner Bases To Linear Codes., Jeanne Fitzgerald

LSU Historical Dissertations and Theses

Put $A={\bf F}\sb{q}\lbrack x\sb1,\...,x\sb{s}\rbrack,$ and let I be an ideal of A. Let $P\sb1,\...,P\sb{n}$ be all the ${\bf F}\sb{q}$-rational points of $V(I)$. Define a map $\varphi:A/I\to{\bf F}\sbsp{q}{n}$ by $\varphi(\tilde f)=(f(P\sb1),\...,f(P\sb{n})),$ where f is any preimage of $\tilde f$ under the canonical map from A to $A/I.$ Let $\{\tilde f\sb{i}\vert i\in {\bf N}\}$ be a basis of $A/I$ as an ${\bf F}\sb{q}$-vector space. Define the affine variety code C and its dual $C\sp\perp$ by$$C=\varphi(\langle\tilde f\sb1,\...,\tilde f\sb{m}\rangle);$$C$\sp\perp$ is the orthogonal complement of C with respect to the usual inner product in ${\bf F}\sbsp{q}{n}$. We show that any linear code can be expressed …

Go to article

Longitudinal Dispersion And Interstitial Velocity Relationship In Subsurface Flow Constructed Wetlands., Gianna M. Cothren Jan 1996

Longitudinal Dispersion And Interstitial Velocity Relationship In Subsurface Flow Constructed Wetlands., Gianna M. Cothren

LSU Historical Dissertations and Theses

Treatment of municipal and rural wastewater using subsurface flow constructed wetlands (SFCW's) is growing in popularity. These systems often consist of an excavated cell containing 2-3 in. rock with the wastewater level maintained below the media surface. A SFCW is a natural form of wastewater treatment which removes organics and nutrients based on the attached growth of microorganisms on crushed rocks where biological reactions take place. The currently accepted design procedure is based on the first order plug flow model, although tracer studies have shown that flow conditions are not well represented by the plug flow condition. This design rationale …

Go to article

Faculty Characteristics That Are Associated With The Retention Of Doctoral Students., Bonnie Chaney Cooper Jan 1996

Faculty Characteristics That Are Associated With The Retention Of Doctoral Students., Bonnie Chaney Cooper

LSU Historical Dissertations and Theses

The primary purpose of this study was to elicit perceptions of doctoral-student advisors regarding issues and processes associated with graduate dissertation research experiences in the schools of vocational education. A mailed survey was sent to teacher educators from the 21 member institutions of the University Council for Vocational Education (UCVE) who had served as chair to at least one doctoral committee. A researcher-designed instrument which used selected scales from other research was sent to the survey population. Statistical analyses were conducted on 144 completed surveys which represented a usable response rate of 76%. The completion rate among faculty's doctoral-student advisees …

Go to article

The Role Of Environmental Attitudes In Incentive-Based Environmental Management: The Case Of The Wetland Reserve Program., Assane Diagne Jan 1996

The Role Of Environmental Attitudes In Incentive-Based Environmental Management: The Case Of The Wetland Reserve Program., Assane Diagne

LSU Historical Dissertations and Theses

Environmental policy in the United States is increasingly relying on incentive-based mechanisms (IBM). Incentive-based mechanisms, are voluntary environmental management instruments based on free market environmentalism, a framework that attempts to harness market forces. A multi-disciplinary approach was developed to evaluate participation decisions in IBM's such as the Wetland Reserve Program. This approach extended the traditional utility maximization approach to choice behavior by including alternative measures of environmental attitudes based on the theory of reasoned action or the New Environmental Paradigm. The addition of these psychological constructs conceptually improved the utility maximization by allowing the consideration of well established determinants of …

Go to article

"Only A Girl": Christine Frederick, Efficiency, Consumerism, And Women's Sphere., Janice Williams Rutherford Jan 1996

"Only A Girl": Christine Frederick, Efficiency, Consumerism, And Women's Sphere., Janice Williams Rutherford

LSU Historical Dissertations and Theses

Christine Frederick was a home efficiency expert who worked out of her home experiment station, Applecroft, in Greenlawn, New York, from 1910 to 1939. She advocated the application of scientific management, technology, and consumer awareness to homemaking. Frederick came of age during a time when feminism was opening a window of opportunity for middle-class, educated, white women. By the time she graduated from Northwestern University, the nineteenth-century doctrine of separate spheres was being challenged. Charlotte Perkins Gilman's critique of the single-family home had been published, the woman suffrage campaign would gain new momentum within the next few years, and women …

Go to article

Communication Network Design And Evaluation Using Shadow Prices., Cesar Vargas-Rosales Jan 1996

Communication Network Design And Evaluation Using Shadow Prices., Cesar Vargas-Rosales

LSU Historical Dissertations and Theses

We use shadow prices to measure the rate of change of performance functions of a communications network with respect to incremental changes in one or more of the design parameters such as capacity, anticipated demand, reservation levels, routing proportions, etc. The ability to evaluate such shadow prices allows us to introduce designs that optimize network performance according to network-wide criteria. We present models for the evaluation of shadow prices for different cases of networks: single-rate circuit-switched networks, wireless networks, multi-rate circuit-switched networks. For these cases, we demonstrate the wide applicability of shadow price methods. We formulate the new and very …

Go to article

Low Temperature Silicon Oxide And Fluorinated Silicon Oxide Films Prepared By Plasma-Enhanced Chemical Vapor Deposition Using Disilane As Silicon Precursor., Juho Song Jan 1996

Low Temperature Silicon Oxide And Fluorinated Silicon Oxide Films Prepared By Plasma-Enhanced Chemical Vapor Deposition Using Disilane As Silicon Precursor., Juho Song

LSU Historical Dissertations and Theses

The deposition and characterization of the silicon oxide and fluorinated silicon oxide films, as interlevel dielectrics in microelectronics devices, prepared by plasma enhanced chemical vapor deposition at low substrate temperature using $\rm Si\sb2H\sb6$ as silicon precursor are studied. The film deposition is limited by the mass transport regime, resulting in nearly temperature independent deposition rate. The characteristics for the silicon oxide films deposited at 120$\sp\circ$C show that the film etch rate is comparable to that obtained by TEOS-based PECVD at 400$\sp\circ$C and the leakage current is comparable to that of the films deposited at 350$\sp\circ$C with conventional SiH$\sb4$ precursor. It …

Go to article

"Engineered Enjoyment": Technology, Capitalism, And The Female Body In Film., Catherine Williamson Jan 1996

"Engineered Enjoyment": Technology, Capitalism, And The Female Body In Film., Catherine Williamson

LSU Historical Dissertations and Theses

This dissertation explores the link between technology, capitalism, and the female body in 20th century cinema. It argues that commodified pleasure, or "engineered enjoyment," is always produced by establishing technological control over the female body. The scope of this dissertation is limited to films produced during the post-World War II era. In Chapter One I define "engineered enjoyment" and show how film is the prototypical example of such. In Chapter Two I examine how the cinematic apparatus works as a pleasure-producing system and explore what happens when that system breaks down, as in the 1947 film Lady in the Lake. …

Go to article

"All This World Is Full Of Mystery": The Fiction Of Ellen Douglas., Elizabeth Wilkinson Tardieu Jan 1996

"All This World Is Full Of Mystery": The Fiction Of Ellen Douglas., Elizabeth Wilkinson Tardieu

LSU Historical Dissertations and Theses

This dissertation, "'All This World Is Full of Mystery:' The Fiction of Ellen Douglas," provides an introduction to the life of Ellen Douglas (pen name for Josephine Haxton) and a study of the author's major fiction from A Family's Affairs through Can't Quit You, Baby (1962-1988). The first chapter gives an overview of Douglas's life preceding her first novel, A Family's Affairs, with a focus on those people and events contributing to the themes and structure of her writing. The subsequent chapters trace the development of her craft, discussing in chronological order A Family's Affairs, Black Cloud, White Cloud, Where …

Go to article

Boundary Layer Turbulence And Sediment Transport In An Inter-Tidal Mudflat Channel., Lun Xu Jan 1996

Boundary Layer Turbulence And Sediment Transport In An Inter-Tidal Mudflat Channel., Lun Xu

LSU Historical Dissertations and Theses

Mudflats along the west coast of South Korea are influenced by high tidal ranges and strong winter monsoonal storms, and are drained by a network of incised channels. In a selected inter-tidal mudflat channel of Namyang Bay, seven levels of 3-D turbulent velocity data, five levels of water temperature data, and two levels of sediment concentration data were collected to analyze turbulent boundary layer flow with stratification. Using time series analysis techniques, the basic turbulent parameters such as turbulent intensity (variance of u$\sp\prime$), vertical momentum flux, $\rm\langle w\sp\prime u\sp\prime\rangle $, and variance of w$\sp\prime$ were obtained. The Reynolds stress distribution …

Go to article

Modular Approaches For Designing Feedforward Neural Networks To Solve Classification Problems., Parvin Hashemian Jan 1996

Modular Approaches For Designing Feedforward Neural Networks To Solve Classification Problems., Parvin Hashemian

LSU Historical Dissertations and Theses

Perhaps the most popular approach for solving classification problems is the backpropagation method. In this approach, a feedforward network is initially built by an intelligent guess regarding the architecture and the number of hidden nodes and then trained using an iterative algorithm. The major problem with this approach is the slow rate of convergence of the training. To overcome this difficulty, two different modular approaches have been investigated. In the first approach, the classification task is reduced to sub-tasks, where each sub-task is solved by a sub-network. An algorithm is presented for building and training each sub-network using any of …

Go to article

A Case-Based Reasoning Approach To Bankruptcy Prediction Modeling., Stephanie Mattox Bryant Jan 1996

A Case-Based Reasoning Approach To Bankruptcy Prediction Modeling., Stephanie Mattox Bryant

LSU Historical Dissertations and Theses

This study examines the usefulness of an artificial intelligence method, case-based reasoning (CBR), in predicting corporate bankruptcy. Based on prior research, CBR is believed to be a viable method of predicting bankruptcy. Hypotheses are developed to test the usefulness of a CBR system and to compare the accuracy of such a system to the model considered to be the benchmark model in bankruptcy prediction, Ohlson's (1980) nine-factor logistic regression (logit) model. Sample data consisting of manufacturing and industrial firms is drawn from the Compustat database in a 20:1 ratio of nonbankrupt to bankrupt firms, consistent with Ohlson's (1980) proportions. Three …

Go to article

The Increase In Shaft Capacity With Time For Friction Piles Driven Into Saturated Clay., Hani Hasan Titi Jan 1996

The Increase In Shaft Capacity With Time For Friction Piles Driven Into Saturated Clay., Hani Hasan Titi

LSU Historical Dissertations and Theses

A general method for predicting pile setup, or the increase in the load carrying capacity of friction piles driven into saturated clay, was developed. The solution is based on the HiSS modeling approach, the strain path method, and the theory of nonlinear porous media. The ability of this method was demonstrated by predicting the field behavior of pile segment models during driving, subsequent consolidation, and load testing. Numerical simulations were performed on pile segment models because of the availability of field experimental tests necessary for verification and evaluation schemes. The method was also applied to investigate the behavior of full-scale …

Go to article

On-Line Steady-State Gain Identification For On-Line Optimization Of Multivariable Constrained Chemical Processes., Umesh Kishore Chitnis Jan 1996

On-Line Steady-State Gain Identification For On-Line Optimization Of Multivariable Constrained Chemical Processes., Umesh Kishore Chitnis

LSU Historical Dissertations and Theses

The Amoco Model IV Fluidized Catalytic Cracking Unit (FCCU) (McFarlane et al, 1993) was augmented with Lee & Groves Model (1985) to provide for a simple but realistic product distribution model. This enabled a better and realistic on-line optimization of the FCCU. A Supervisory Multivariable Constrained Optimization (SMCO) algorithm was applied to this augmented model. It was observed that the FCC unit is optimized successfully, without violating any constraints. The parabolic error-penalizing function, incorporated in the algorithm allowed the constraints to asymptotically approach the limits without violating them. The on-line optimization to FCC unit led to maximizing of the feeds, …

Go to article

Tertiary Recovery Of Oil By Up-Dip Gas Injection., Tammy Theresa Bourgoyne Jan 1996

Tertiary Recovery Of Oil By Up-Dip Gas Injection., Tammy Theresa Bourgoyne

LSU Historical Dissertations and Theses

A tertiary gas injection process denotes the mobilization of waterflood residual oil by gas invasion; whereas, secondary gas injection denotes the displacement of a continuous oil phase by gas. The term up-dip gas injection implies that the gas is injected in the crest of the structure in order to displace fluid down-dip where it can be recovered in a production well; whereas, an attic oil recovery process usually implies a cyclic injection/recovery process using a single well. The objective of this study is to develop a technique for modelling relative permeability in a tertiary gas injection process occurring in a …

Go to article

Expression Of A Designed Cecropin Analog Gene Using A Baculovirus Vector., Kyusam Choi Jan 1996

Expression Of A Designed Cecropin Analog Gene Using A Baculovirus Vector., Kyusam Choi

LSU Historical Dissertations and Theses

Cecropins are basic, amphipathic peptides with antibacterial activity against many Gram-positive and Gram-negative bacteria. By retaining the positively charged, amphipathic characteristic of cecropin B, a cecropin analog S1, in which 54% of amino acid residues were substituted, was synthesized and shown to possess a broad spectrum of antimicrobial activity. To determine expression of the cecropin analog S1 in Sf9 cells, two gene constructs were designed, and inserted into Autographa californica nuclear polyhedrosis virus under the control of the polyhedrin promoter. One construct, pBS1, consisted of a gene encoding the analog peptide, so that the gene was intended for expression in …

Go to article

Thiamine, Riboflavin, And Sensory Stability Of Irradiated Brown Rice., Linda Chamberlain Douglas Jan 1996

Thiamine, Riboflavin, And Sensory Stability Of Irradiated Brown Rice., Linda Chamberlain Douglas

LSU Historical Dissertations and Theses

While brown rice is nutritionally superior to white rice, it is not shelf stable, becoming rancid in a matter of weeks. Preservation by refrigeration or freezing is expensive and not universally available. Therefore, other preservation methods, such as aqueous ethanol extraction of lipids, have been studied to overcome this problem, but these methods also have limitations. The effects of gamma-irradiation on the physicochemical properties and lipase activity in brown rice has been well documented. Gamma-irradiation has been shown to reduce lipase activity, presumably preserving sensory quality. A sensory study of 2 Louisiana grown varieties (Mars and Lemont) of irradiated brown …

Go to article

A Reverse Engineering Methodology For Extracting Parallelism From Design Abstractions., Ravi Chandra Erraguntla Jan 1996

A Reverse Engineering Methodology For Extracting Parallelism From Design Abstractions., Ravi Chandra Erraguntla

LSU Historical Dissertations and Theses

Migration of code from sequential environments to the parallel processing environments is often done in an ad hoc manner. The purpose of this research is to develop a reverse engineering methodology to facilitate systematic migration of code from sequential to the parallel processing environments. The research results include the development of a three-phase methodology and the design and development of a reverse engineering toolkit (abbreviated as RETK) which serves to establish a working model for the methodology. The methodology consists of three phases: Analysis, Synthesis, and Transformation. The Analysis phase uses concepts from reverse engineering research to recover the sequential …

Go to article

Delights Of The Night And Pleasures Of The Void: Vampirism And Entropy In Nineteenth-Century Literature., Michael James Dennison Jan 1996

Delights Of The Night And Pleasures Of The Void: Vampirism And Entropy In Nineteenth-Century Literature., Michael James Dennison

LSU Historical Dissertations and Theses

This dissertation explores the figure of the vampire in the nineteenth century as a metaphor of disorder, especially as interpreted through the root metaphor of the second law of thermodynamics, also known as entropy. The theoretical approach used in the reading of several vampire texts is an entropy theory of literature, a mostly aesthetic approach of relevance to a comparatist study on vampirism and entropy. Chapter One considers the female vampire in one of her earliest nineteenth-century incarnations, the seductive Clarimonde of Theophile Gautier's La Morte amoureuse. Chapter Two is a study of the vampire women in Edgar Allan Poe's …

Go to article

Extraction And Analysis Of Triazines In Fish Tissues Following A Toxic Exposure: Environmental Factors Affecting Atrazine Toxicity In Fish., Patricia Simmons Gaunt Jan 1996

Extraction And Analysis Of Triazines In Fish Tissues Following A Toxic Exposure: Environmental Factors Affecting Atrazine Toxicity In Fish., Patricia Simmons Gaunt

LSU Historical Dissertations and Theses

Rapid, generic, and environmentally friendly methods for extraction and detection of the pesticides atrazine, cyanazine, metribuzin, and simazine were developed for use in monitoring the cause of pesticide related or suspect fish kills. Further, environmental hypoxia and elevated temperature were studied as possible contributors to the toxicity of atrazine in channel catfish (Ictalurus punctatus) and as synergistic factors to be considered in investigating fish kill events. Incurred residues from the exposure of catfish to atrazine alone or hypoxia or elevated temperature and atrazine were also analyzed. A commercial enzyme-linked immunoassay (ELISA) was utilized as a screening method for the presence …

Go to article

Adaptive Harmonic Blocking Compensators., Shih-Min Hsu Jan 1996

Adaptive Harmonic Blocking Compensators., Shih-Min Hsu

LSU Historical Dissertations and Theses

This dissertation explores a new method of adaptive compensation and harmonic suppression in distribution systems. The compensator under development and investigation integrates a harmonic blocking compensator (HBC) with an adaptive balancing compensator (ABC) resulting in an adaptive harmonic blocking compensator (AHBC). Such a compensator can be used for compensating reactive power, for symmetrizing supply currents, for protecting the distribution system against load generated current harmonics and, consequently, the voltage harmonic distortion caused by non-linear loads. Harmonic blocking compensators are designed for compensating fixed loads, and they are not adaptive devices, while the adaptive capability of compensators is becoming more and …

Go to article

Design And Analysis Of Reduced-Connection Multiple Bus Systems: A Probabilistic Approach., Najmul Karim Jan 1996

Design And Analysis Of Reduced-Connection Multiple Bus Systems: A Probabilistic Approach., Najmul Karim

LSU Historical Dissertations and Theses

In the dissertation we have proposed the first systematic and formal approach to reduce connectivity of general purpose multiple bus systems. The approach is based on a probabilistic technique. The hypothesis on which this dissertation is based stipulates that bus connectivity in multiple bus systems can be much reduced by removing connections which are only needed for highly improbable request patterns. With this approach, performance comparable to that of the original multiple bus system could be achieved while significantly reducing memory bus connectivity. The new architecture thus obtained (Probabilistically load reduced connection multiple bus system, or PRMB in short) might …

Go to article

Dinitropyrenes: Nitroreduction Processes And Evaluation Of Indices Of Exposure., Matthew Jerome Krautmann Jan 1996

Dinitropyrenes: Nitroreduction Processes And Evaluation Of Indices Of Exposure., Matthew Jerome Krautmann

LSU Historical Dissertations and Theses

Investigations were conducted to identify biomarkers of exposure to dinitropyrenes (DNPs), which are mutagenic and carcinogenic residues of incomplete combustion. One possible biomarker, a DNP-protoporphyrin IX adduct, was not found in analytically useful quantities in liver tissue or in bile. Clastogenicity, a biomarker of effect, also was found to be absent in marrow cells following subchronic exposure of rats to DNPs by gavage. Solubility studies, used as a basis for dosing guidelines, revealed that DNPs are relatively insoluble in both aqueous and lipid tissue compartments. Calculated log P values indicated that the reduced metabolites of DNPs probably are more soluble …

Go to article

Allocation Of Two Dimensional Parts Using A Shape Reasoning Heuristic., Henry Joseph Lamousin Iii Jan 1996

Allocation Of Two Dimensional Parts Using A Shape Reasoning Heuristic., Henry Joseph Lamousin Iii

LSU Historical Dissertations and Theses

A technique is outlined for the allocation of irregular parts onto arbitrarily shaped resources. Placements are generated by matching complementary shapes between the unplaced parts and the remaining areas of the stock material. The part and resource profiles are characterized to varying levels of detail using geometric "features". Information contained in the features is used at each stage of processing to intelligently select and place parts on the resource. Techniques for the efficient handling of complex profiles and other practical implementation issues are described. The utility of the proposed approach is verified using diverse problems from a marine fabrication facility. …

Go to article

The Effect Of Demand Forecasting On Production Policies And Coordination In Periodic Review Production Systems., Chih-Ming Lee Jan 1996

The Effect Of Demand Forecasting On Production Policies And Coordination In Periodic Review Production Systems., Chih-Ming Lee

LSU Historical Dissertations and Theses

We consider a sequential decision process in a periodic review production system. At the beginning of each period, marketing decides how much money to be invested in demand forecasting. After its decision, marketing obtains the forecast and passes the forecast to production, which then determines production quantity. Centralized and decentralized models are formulated. In the centralized model, the two divisions make their decisions by considering the total profit of the company. In the decentralized model, marketing pays production a unit transfer price for every product sold. Three types of policies about the unit transfer price are considered. In the company …

Go to article

First Prev Next Last