Digital Commons Network^™

Studying The Use Of Hidden Markov Models In The Detection And Classification Of Eeg Epileptiform Transients Using Lpc Features, Kartikeya Shrikant Bagalore

All Theses

The process of identifying the presence of an AEP (Abnormal Epileptiform Paroxysmal) in a subject's EEG, normally done by neurologist experts, is a particularly long one and involves considerable financial expenses. This research aims to pave an automatic method of detecting and classifying streams of EEGs as to whether or not it has any AEPs present in it. This is a two step process, where step 1 is the classification problem and step 2 is the detection problem. There are many different activities on the EEGs, and the classification task helps to identify which of these activities are AEPs. So, …

Dec2016, Robert Kelly

Robert Kelly Manuscripts

From December 2016 Robert Kelly archive.

Understanding And Tackling Societal Grand Challenges Through Management Research, Gerard George, Jennifer Howard-Grenville, Aparna Joshi, Laszlo Tihanyi

Research Collection Lee Kong Chian School Of Business

“Grand challenges” are formulations of global problems that can be plausibly addressed through coordinated and collaborative effort. In this Special Research Forum, we showcase management research that examines societal problems that individuals, organizations, communities, and nations face around the world. We develop a framework to guide future research to provide systematic empirical evidence on the formulation, articulation, and implementation of grand challenges. We highlight several factors that likely enhance or suppress the attainment of collective goals, and identify representative research questions for future empirical work. In so doing, we aspire to encourage management scholars to engage in tackling broader societal …

Appointment Systems Under Service Level Constraints, David Chen, Rowan Wang, Zhenzhen Yan, Saif Benjaafar, Oualid Jouini

Research Collection Lee Kong Chian School Of Business

We consider a new model of appointment scheduling where customers are given the earliest possible appointment times under the service level constraint that the expected waiting time of each individual customer cannot exceed a given threshold. We apply the theory of majorization to analytically characterize the structure of the optimal appointment schedule. We show that, the optimal inter-appointment times increase with the order of arrivals. That is, the optimal inter-arrival time between two customers later in the arrival process is longer than that between two customers earlier in the arrival process. We study the limiting behavior of our system, and …

The Cultural Construction Of Subject Discipline Knowledge: Comparing ‘Abstraction’ In Two International Contexts, Nick Pratt, Peter Kelly

Plymouth Institute of Education

No abstract provided.

A Decision Support System For Strategic Maintenance Planning In Offshore Wind Farms, X Li, D Ouelhadj, X Song, D Jones, Et Al

Plymouth Business School

This paper presents a Decision Support System (DSS) for maintenance cost optimisation at an Offshore Wind Farm (OWF). The DSS is designed for use by multiple stakeholders in the OWF sector with the overall goal of informing maintenance strategy and hence reducing overall lifecycle maintenance costs at the OWF. Two optimisation models underpin the DSS. The first is a deterministic model that is intended for use by stakeholders with access to accurate failure rate data. The second is a stochastic model that is intended for use by stakeholders who have less certainty about failure rates. Solutions of both models are …

The Candidate Cluster And Protocluster Catalog (Ccpc). Ii. Spectroscopically Identified Structures Spanning 2 < Z < 6.6, J. R. Franck, Stacy S. Mcgaugh

Faculty Scholarship

The Candidate Cluster and Protocluster Catalog (CCPC) is a list of objects at redshifts z > 2 composed of galaxies with spectroscopically confirmed redshifts that are coincident on the sky and in redshift. These protoclusters are identified by searching for groups in volumes corresponding to the expected size of the most massive protoclusters at these redshifts. In CCPC1 we identified 43 candidate protoclusters among 14,000 galaxies between 2.74 < z < 3.71. Here we expand our search to more than 40,000 galaxies with spectroscopic redshifts z > 2.00, resulting in an additional 173 candidate structures. The most significant of these are 36 protoclusters with overdensities δ gal > 7. We also identify three large proto-supercluster candidates containing multiple protoclusters at z …

Appointment Sequencing: Why The Smallest-Variance-First Rule May Not Be Optimal, Qingxia Kong, Chung-Yee Lee, Chung-Piaw Teo, Zhichao Zheng

Research Collection Lee Kong Chian School Of Business

We study the design of a healthcare appointment system with a single physician and a group of patients whose service durations are stochastic. The challenge is to find the optimal arrival sequence for a group of mixed patients such that the expected total cost of patient waiting time and physician overtime is minimized. While numerous simulation studies report that sequencing patients by increasing order of variance of service duration (Smallest-Variance-First or SVF rule) performs extremely well in many environments, analytical results on optimal sequencing are known only for two patients. In this paper, we shed light on why it is …

Integrated Design Of Downwind Land-Based Wind Turbines Using Analytic Gradients, Andrew Ning, Derek Petch

Faculty Publications

Wind turbines are complex systems where component-level changes can have significant system-level effects. Effective wind turbine optimization generally requires an integrated analysis approach with a large number of design variables. Optimizing across large variable sets is orders of magnitude more efficient with gradient-based methods as compared to gradient-free method, particularly when using exact gradients. We have developed a wind turbine analysis set of over 100 components where 90% of the models provide numerically exact gradients through symbolic differentiation, automatic differentiation, and adjoint methods. This framework is applied to a specific design study focused on downwind land-based wind turbines.

Downwind machines …

Implementation And Testing Of A Book Lookup System For The Robert E. Kennedy Library, Casey C. Sheehan

Computer Science and Software Engineering

The goal of this senior project centered around improving the quality of student and teacher experiences when visiting the library. The task of finding a book amongst the shelves is an arduous one, which I felt could be improved upon through implementation and testing of a Book Lookup system for the Cal Poly Robert E. Kennedy Library. Development for this project was done using a Python framework. Testing and earlier designs were also created using JavaScript and PHP. Repeated tests were conducted on the accuracy of the software and its ability to decrease user search-time when compared to conventional methods.

Review Classification, Balraj Aujla

Computer Science and Software Engineering

The goal of this project is to find a way to analyze reviews and determine the sentiment of a review. It uses various machine learning techniques in order to achieve its goals such as SVMs and Naive Bayes. Overall the purpose is to learn many different machine learning techniques, determine which ones would be useful for the project, then compare the results. Research is the foremost goal of the project, and it is able to determine the better algorithm for review classification, naive bayes or an SVM. In addition, an SVM which actually gave review’s scores rather than just classifying …

Elasticity Of Cylindrical Black Holes, Conrad Pearson

Physics

Black holes are regions of strong gravity, and are often regarded as behaving like drops of fluid. When this line of thought is applied to cylindrical black holes (black cylinders), a mapping can be made between known instabilities for black cylinders and ordinary fluid cylinders. However, this known correlation is increasingly less accurate for lower spatial dimensions, and I seek to correct this discrepancy in this thesis. By considering soft solids instead of pure fluids, elastic energy can be included, which brings us closer to a direct comparison. In improving this mapping, it becomes possible to better understand the behavior …

Like A Duck On Water: Chinese Academic Migrants In The U.S. And Their Suburban Weekend Chinese School, Jianping Xu

Dissertations - ALL

Current literature is scarce on the diverse experiences of hundreds of thousands of mainland Chinese who, since 1979, have come to the U.S. primarily for graduate study and mostly settled here afterwards in dispersed university or corporate jobs and suburban residences. After the Immigration Act of 1990, many of them have become visible experts in science and engineering. Yet their struggles as Chinese academic migrants simultaneously privileged by their educational backgrounds and disadvantaged by their outsider status in the U.S. often remain invisible. Possibly due to the myth of “model minority,” mainstream America has seen them as doing-well and well-behaving, …

Strengths And Limitations Of Forensic Science: What Dna Exonerations Have Taught Us And Where To Go From Here, Vanessa Meterko

West Virginia Law Review

No abstract provided.

An Uncivil Action: Criminalizating Daubert In Procedure And Practice To Avoid Wrongful Convictions, Jessica G. Cino

West Virginia Law Review

No abstract provided.

Leveraging A Teacher Mentorship Program In A Complex System, Jami L. Holbein Swanson

Department of Teaching, Learning, and Teacher Education: Theses and Other Student Research

The support a beginning teacher receives varies from school to school, and from district to district. When beginning teachers are not supported, their learning as teachers is not maximized. New teacher induction is the strategy most school districts employ to support new-hires. Current scholarship suggests the terms induction and mentor program are often used interchangeably, but actually have very different definitions. Mentors programs are one component of a comprehensive induction program; where as, an induction program is a series of events or activities in the beginning years of a teacher’s career. Effectively leveraging the mentorship program in a complex system …

Dilation Behavior Of Thermal Spray Coatings, Miryan Lorena Bejarano

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Thermal Spray (TS) is a very versatile manufacturing process to deposit thick coatings on a variety of substrates. Coatings are used in protective (i.e. wear, chemical attack, high temperature, etc.) and functional (i.e. sensors) applications. TS coatings have a unique lamellar microstructure as a result of the overlapping of millions of molten and partially-molten particles. During processing, high deformation by impact, high temperature, and rapid solidification lead to a complex hierarchical material system that contains a high amount of microstructural defects. The presence of defects in the microstructure contribute to differences in property values in comparison to bulk materials. Thermal …

The Role Of Nanofillers In Polymer Nanocomposites, Di Xu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Polymer nanocomposites have been widely used in many fields. By introducing nanoparticles as fillers, researchers are able to get reinforced materials and new materials with novel properties, such as stronger mechanics, enhanced optical properties and improved conductivity. Though experimental techniques have rapidly advanced to enable better control of materials at atomic level, there is still a lack of a fundamental understanding of the dynamics and structure-properties relations in polymer nanocomposites. In this thesis, we use computer simulations to study the molecular structure and connections between microstate to macro properties of a variety of nanocomposites. Our goal is to understand the …

Characterization Of Structural Defects In Wide Band-Gap Compound Materials For Semiconductor And Opto-Electronic Applications, Ouloide Yannick Goue

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Single crystals of binary and ternary compounds are touted to replace silicon for specialized applications in the semiconductor industry. However, the relative high density of structural defects in those crystals has hampered the performance of devices built on them. In order to enhance the performance of those devices, structurally perfect single crystals must be grown. The aim of this thesis is to investigate the interplay between crystal growth process and crystal quality as well as structural defect types and transport property. To this end, the thesis is divided into two parts. The first part provides a general review of the …

Estimation Of Stable Distribution And Its Application To Credit Risk, Hua Mo

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

To capture the heavy tails and the volatility clustering of asset returns is always an important topic in nancial market. We studies two projects related to the Alpha Stable distribution and Classical Tempered Stable(CTS) distribution respectively which both have desired properties to accommodate heavy-tails and capture skewness in nancial series. (1) In the major part of the rst project, we introduce the algorithm of indirect inference method. By using the skewed-t distribution as an auxiliary model which is easier to handle, we can estimate the parameters of the Alpha Stable distribution since these two models have the same numbers of …

An Investigation Into The Effects Of Process Parameters On The Quality Of Laminates, Haomin Liu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

In this work curing process for glass fiber reinforced polymer composite laminates is studied. Curing temperature, time and pressure were selected as the cure parameters for optimization. Central composite design (CCD) of design of experiment (DOE) approach was adopted for conducting the experiments. Flexural strength and flexural modulus of the composite laminate were the response measures to select the final cure parameters. Analysis of variance (ANOVA), surface plots and contour plots clearly demonstrate that temperature, time and pressure contribute greatly to the response functions. This establishes two models that can be used to predict the mechanical properties of composite laminated …

The Role Of Nanofillers In Polymer Nanocomposites, Di Xu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Polymer nanocomposites have been widely used in many fields. By introducing nanoparticles as fillers, researchers are able to get reinforced materials and new materials with novel properties, such as stronger mechanics, enhanced optical properties and improved conductivity. Though experimental techniques have rapidly advanced to enable better control of materials at atomic level, there is still a lack of a fundamental understanding of the dynamics and structure-properties relations in polymer nanocomposites. In this thesis, we use computer simulations to study the molecular structure and connections between microstate to macro properties of a variety of nanocomposites. Our goal is to understand the …

Characterization Of Structural Defects In Wide Band-Gap Compound Materials For Semiconductor And Opto-Electronic Applications, Ouloide Yannick Goue

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Single crystals of binary and ternary compounds are touted to replace silicon for specialized applications in the semiconductor industry. However, the relative high density of structural defects in those crystals has hampered the performance of devices built on them. In order to enhance the performance of those devices, structurally perfect single crystals must be grown. The aim of this thesis is to investigate the interplay between crystal growth process and crystal quality as well as structural defect types and transport property. To this end, the thesis is divided into two parts. The first part provides a general review of the …

An Investigation Into The Effects Of Process Parameters On The Quality Of Laminates, Haomin Liu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

In this work curing process for glass fiber reinforced polymer composite laminates is studied. Curing temperature, time and pressure were selected as the cure parameters for optimization. Central composite design (CCD) of design of experiment (DOE) approach was adopted for conducting the experiments. Flexural strength and flexural modulus of the composite laminate were the response measures to select the final cure parameters. Analysis of variance (ANOVA), surface plots and contour plots clearly demonstrate that temperature, time and pressure contribute greatly to the response functions. This establishes two models that can be used to predict the mechanical properties of composite laminated …

Infinitely Primitively Renormalizable Polynomials With Bounded Combinatorics, Joseph Adams

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Infinitely renormalizable quadratic polynomials have been heavily studied. In the context of quadratic-like renormalization, one may try to prove the existence of a priori bounds, a definite thickness for the annuli corresponding to the renormalizations. In 1997, M. Lyubich showed that a priori bounds imply local connectivity of the Julia set and combinatorial rigidity for the corresponding quadratic polynomial. In a paper from 2006, J. Kahn showed that infinitely renormalizable quadratic polynomials of bounded primitive type admit a priori bounds. In 2002, H. Inou generalized some of the polynomial-like renormalization theory to polynomials of higher degree with several critical points. …

Algebraic Structures With Structure Constants And Homotopical Algebra, Cameron Crowe

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

We consider algebraic structures on vector spaces (or chain complexes) V with operations having any number, m, inputs, and any number, n, outputs, including m or n equal to 0. An operation with 0 inputs and n outputs means a choice of an element in the n-fold tensor product of V (for example, the unit of a commutative algebra), an operation with m inputs and 0 outputs means a linear map from the n-fold tensor product of V to the ground field (for example, a linear functional or a pairing), and an operation with 0 inputs and 0 outputs means …

Refined Convergence For Genus-Two Pseudo-Holomorphic Maps, Jingchen Niu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

The moduli spaces of pseudo-holomorphic maps into an almost Kahler manifold are fundamental to Gromov-Witten theory. It has been speculated since the early days of Gromov-Witten theory that these moduli spaces contain natural closed subspaces, whenever the genus is positive, that also give rise to curve-counting invariants. This speculation was confirmed in genus 1 over a decade ago. In this dissertation, we describe a natural subspace of every moduli space of genus 2 pseudo-holomorphic maps that has strata of the correct virtual dimension to give rise to curve-counting invariants. We establish most of the convergence statements for sequences of such …

Deformations Of Twisted Csck Metrics, Yu Zeng

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

In this dissertation, we describe a new continuity path introduced by X. Chen aiming to attack the existence problem of constant scalar curvature problem via a direct PDE approach. The path connects the solution of J-equation to the constant scalar curvature Kaehler metric. We will present various openness results about the continuity path. The openness at $t = 0$ is in fact a perturbation result from a solution of second order partial differential equation to a solution of a fourth order partial differential equation. | 44 pages

Multiplicativity Of Perverse Filtration For Hilbert Schemes Of Fibered Surfaces, Zili Zhang

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Let $S\to C$ be a smooth projective surface with numerically trivial canonical bundle fibered onto a curve. We prove the multiplicativity of the perverse filtration with respect to the cup product on $H^*(S^{[n]},\mathbb{Q})$ for the natural morphism $S^{[n]}\to C^{(n)}$. We also prove the multiplicativity for five families of Hitchin systems obtained in a similar way and compute the perverse numbers of the Hitchin moduli spaces. We show that for small values of $n$ the perverse numbers match the predictions of the numerical version of the de Cataldo-Hausel-Migliorini $P=W$ conjecture and of the conjecture by Hausel-Letellier-Villegas. | 48 pages

Engineering Interface And Analysis In Orthopedic Surgery: Resection Of Bone Tumors And Reconstruction Using Biomimetic Implants, Carlos Gabriel Helguero Alcivar

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

As healthcare grows more advanced, the next step is an individualized approach to patient care. Skeletal tumor resection provides complex challenges for surgeons. The goal of providing an accurate wide resection in sarcomas from preoperative plans while trying to preserve as much functionality remains a difficult task. We propose to leverage new devel- opments in 3-D printing, computer aided design (CAD), and finite element analysis (FEA) to design and manufacture personalized cutting guides in order to increase the accuracy of childhood bone cancer resections, minimize post-resection fracture risk, and maximize al- lograft osteointegration. On the other side, after proper resection, …