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Eis, Pavel. "Datová sada pro klasifikaci síťových zařízení pomocí strojového učení." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2021. http://www.nusl.cz/ntk/nusl-445543.
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Automatic classification of devices in computer network can be used for detection of anomalies in a network and also it enables application of security policies per device type. The key to creating a device classifier is a quality data set, the public availability of which is low and the creation of a new data set is difficult. The aim of this work is to create a tool, that will enable automated annotation of the data set of network devices and to create a classifier of network devices that uses only basic data from network flows. The result of this work is a modular tool providing automated annotation of network devices using system ADiCT of Cesnet's association, search engines Shodan and Censys, information from PassiveDNS, TOR, WhoIs, geolocation database and information from blacklists. Based on the annotated data set are created several classifiers that classify network devices according to the services they use. The results of the work not only significantly simplify the process of creating new data sets of network devices, but also show a non-invasive approach to the classification of network devices.
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Kavianpour, Isfahani Zahra. "Statistical Analysis of Stormwater Device Testing Protocols in Portland, Oregon." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/676.
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Stormwater treatment is commonly performed with a combination of approaches including the utilization of natural systems and engineered devices. Before using a proprietary treatment instrument it is required to verify its performance and efficiency in reducing different pollution components including the TSS. Different states have developed strategies and regulations for accepting new instruments. In this thesis the stormwater management plan of the City of Portland, Oregon(2008), is analyzed in order to improve the current regulations. These rules apply to new technologies which are proposed by vendors to be used in Portland's stormwater treatment plans. Each requirement which should be met by the applying vendors is thoroughly analyzed followed by a comparison with the Stormwater management plan(2008)regulations of the state of Washington the so called Technology Assessment Plan-Ecology TAPE (Howie, 2011). Because of the similarities in the climate and land use between these two testing frameworks in order to evaluate the potential applicability of data submitted by vendors who had devices approved by Washington, to be utilized by Portland. The treatment of total suspended solids (TSS) is the focus of this thesis since it is central to the testing process and since most of the other pollutions are attached to TSS and will get treated if TSS is treated. The overall analysis shows that Portland adopts more restrictive requirements on the characterization of stormwater event samples to be treated by a technological instrument while Washington's restriction are more stringent on the efficiency of total suspended solid removal, in which it demands higher standards on the treatment of TSS compared to Portland's efficiency requirements. In order to study practical context in which regulations are administrated by Portland, rainfall data from 66 gauges covering the period of 1980-2011 was studied and the impacts of seasonality, land use, land form, periods of no rain before and after an event and Portland's Modified Performance line on the number of accepted rain events were analyzed. The results which were accepted by state of Washington were also compared with the results accepted by the city of Portland on Portland's Standard Performance line. Our seasonality study suggests that Portland's requirements are unnecessarily restrictive which results in the disqualification of many otherwise useful stormwater events, sometimes allowing no natural events to be available for testing in dry years. The analysis of land use showed that land use has no statistically significant impact on the concentration levels of TSS, thereby indicating that land use restrictions in the testing rules could be usefully relaxed. Decreasing the interevent no-rain period significantly increases the total number of events providing sufficient data to assess the performance of treatment facilities. We also showed that many more events become suitable for performance testing if events separated by one hours or less are considered a single, longer event. Finally we identified a statistical relationship between number of forecasted accepted stormwater events and the total average daily precipitation in a given year.
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Oltmans, Michael (Michael David) 1975. "Understanding naturally conveyed explanations of device behavior." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86620.
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Boyle, Linda T. Ng. "Statistical analyses of traffic advisory systems on driving behavior /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/10174.
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Chow, Fung-kiu, and 鄒鳳嬌. "Modeling the minority-seeking behavior in complex adaptive systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B29367487.
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Uan-Zo-li, Julie Tammy. "Morphology, Crystallization and Melting Behavior of Propylene-Ethylene Statistical Copolymers." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29143.
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In this work the morphology, crystallization and melting behavior of novel Dow Chemical propylene-ethylene copolymers were investigated.
The incorporation of ethylene units into a polypropylene chain resulted in the decrease in crystallization, melting and glass transition temperatures and overall crystallinity. Based on the shape of heat capacity curves and the dependence of the melting temperature offset on ethylene content, it was concluded that copolymers prepared using different catalyst systems exhibited different ethylene sequence length distributions.
The behavior of Dow Chemical propylene-ethylene copolymers was compared to that of copolymers prepared using traditional metallocene and Ziegler-Natta catalysts. The catalyst system used in the preparation of these new copolymers is similar to a metallocene catalyst system.
It was demonstrated that ethylene defects are partially included in the polypropylene crystal. The thermodynamic heat of fusion at the equilibrium melting temperature decreased by 44% with an increase in ethylene concentration from 0 mol% to 21.2 mol%. On the basis of calorimetric and density data, the inclusion model based on the Sanchez-Eby crystallization theory was shown to be applicable for the evaluation of the degree of crystallinity. At the same time, inadequacies were found in application of the rigid amorphous fraction model to these copolymers.
The formation of gamma-phase crystals was shown to be favored by both an increase in the ethylene content and a decrease in the crystallization rate. Increase in the ethylene content was shown to lead to a decrease in the density, length and thickness of alpha-phase crystals. It was also demonstrated that the cross-hatching morphology is present in all propylene-ethylene copolymers.Ph. D.
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Maitani, Masato Allara David L. "Observation of molecular level behavior in molecular electronic junction device." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-4517/index.html.
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Negahban, Arash. "Does Device Matter? Understanding How User, Device, and Usage Characteristics Influence Risky IT Behaviors of Individuals." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804895/.
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Over the past few years, there has been a skyrocketing growth in the use of mobile devices. Mobile devices are ushering in a new era of multi-platform media and a new paradigm of “being-always-connected”. The proliferation of mobile devices, the dramatic growth of cloud computing services, the availability of high-speed mobile internet, and the increase in the functionalities and network connectivity of mobile devices, have led to creation of a phenomenon called BYOD (Bring Your Own Device), which allows employees to connect their personal devices to corporate networks. BYOD is identified as one of the top ten technology trends in 2014 that can multiply the size of mobile workforce in organizations. However, it can also serve as a vehicle that transfers cyber security threats associated with personal mobile devices to the organizations. As BYOD opens the floodgates of various device types and platforms into organizations, identifying different sources of cyber security threats becomes indispensable. So far, there are no studies that investigated how user, device and usage characteristics affect individuals’ protective and risky IT behaviors. The goal of this dissertation is to expand the current literature in IS security by accounting for the roles of user, device, and usage characteristics in protective and risky IT behaviors of individuals. In this study, we extend the protection motivation theory by conceptualizing and measuring the risky IT behaviors of individuals and investigating how user, device, and usage characteristics along with the traditional protection motivation factors, influence individuals’ protective and risky IT behaviors. We collected data using an online survey. The results of our study show that individuals tend to engage in different levels of protective and risky IT behaviors on different types of devices. We also found that certain individual characteristics as well as the variety of applications that individuals use on their computing devices, influence their protective and risky IT behaviors.
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Kaplan, David Louis. "Characterizing chaos in a hybrid optically bistable device." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184440.
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Turbulence and periodic oscillations are easily seen with an optically bistable device with a delay in the feedback. The device is a hybrid, having both optical and electronic components. The details of the time-dependent output are investigated. In particular, as the input intensity is increased, the device output goes through a series of second-order nonequilibrium phase transitions or bifurcations. A truncated period-doubling sequence is observed prior to the onset of turbulence or chaos. The truncation is shown to be due to a noise-induced bifurcation gap. Within the chaotic regime, the device largely follows the reverse bifurcation scheme of Lorenz. In addition, there is a small domain of frequency-locked behavior that exists within the chaotic domain. These frequency-locked waveforms represent an alternate path to chaos. With the route to choas well understood, it remained to characterize the erratic motion itself. Dimension and correlation entropy are measured for various settings of our hybrid device. The measured dimension is found to be significantly less than dimensions consistent with a conjecture due to Kaplan and Yorke. The standard method of determining correlation entropy is shown to yield more than one value.
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Amer, Ahmed. "Statistical and Behavioral Modeling of Driver Behavior on Signalized Intersection Approaches." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77995.
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The onset of a yellow indication is typically associated with the risk of vehicle crashes resulting from dilemma-zone and red-light-running problems. Such risk of vehicle crashes is greater for high-speed signalized intersection approaches. The research presented in this dissertation develops statistical as well as behavioral frameworks for modeling driver behavior while approaching high-speed signalized intersection approaches at the onset of a yellow indication. The analysis in this dissertation utilizes two sources of data. The main source is a new dataset that was collected as part of this research effort during the summer of 2008. This experiment includes two instructed speeds; 72.4 km/h (45 mph) with 1727 approaching trials (687 running and 1040 stopping), and 88.5 km/h (55 mph) with 1727 approaching trials (625 running and 1102 stopping). The complementary source is an existing dataset that was collected earlier in the spring of 2005 on the Virginia Smart Road facility. This dataset includes a total of 1186 yellow approaching trials (441 running and 745 stopping).
The adopted analysis approach comprises four major parts that fulfill the objectives of this dissertation. The first part is concerned with the characterization of different driver behavioral attributes, including driver yellow/red light running behavior, driver stop-run decisions, driver perception-reaction times (PRT), and driver deceleration levels. The characterization of these attributes involves analysis of variance (ANOVA) and frequency distribution analyses, as well as the calibration of statistical models. The second part of the dissertation introduces a novel approach for computing the clearance interval duration that explicitly accounts for the reliability of the design (probability that drivers do not encounter a dilemma zone). Lookup tables are developed to assist practitioners in the design of yellow timings that reflects the stochastic nature of driver PRT and deceleration levels. An extension of the proposed approach is presented that can be integrated with the IntelliDriveSM initiative.
Furthermore, the third part of the dissertation develops an agent-based Bayesian statistics approach to capture the stochastic nature of the driver stop-run decision. The Bayesian model parameters are calibrated using the Markov Chain Monte Carlo (MCMC) slice procedure implemented within the MATLAB® software. In addition, two procedures for the Bayesian model application are illustrated; namely Cascaded regression and Cholesky decomposition. Both procedures are demonstrated to produce replications that are consistent with the Bayesian model realizations, and capture the parameter correlations without the need to store the set of parameter realizations. The proposed Bayesian approach is ideal for modeling multi-agent systems in which each agent has its own unique set of parameters. Finally, the fourth part of the dissertation introduces and validates a state-of-the-art behavioral modeling framework that can be used as a tool to simulate driver behavior after the onset of a yellow indication until he/she reaches the intersection stop line. The behavioral model is able to track dilemma zone drivers and update the information available to them every time step until they reach a final decision. It is anticipated that this behavioral model will be implemented in microscopic traffic simulation software to enhance the modeling of driver behavior as they approach signalized intersections.Ph. D.
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Mikutta, Lukas [Verfasser]. "Thermal behavior and aging mechanisms of power device packages / Lukas Mikutta." München : Verlag Dr. Hut, 2018. http://d-nb.info/1174426705/34.
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Zahner, Robert Marne. "Experimental investigation of energy dissipation behavior of the modified friction device." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66849.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 50).
As building materials become stronger, dynamic design and structural control are effective means of improving serviceability in the future's ever lighter structures. The recently proposed modified friction device (MFD) addresses many of the concerns that have prevented the building industry from fully embracing non-passive control: the device is based on the drum brake, a reliable technology that is inexpensive, already mass manufactured, capable of producing very large damping forces, and has such low power inputs that it can be run from a battery in the event of a power outage. Preliminary studies have shown that an MFD-based control scheme is at least as effective as an existing system that uses dampers capable of the same maximum force. The goal of this thesis was to better understand the MFD's energy dissipation behavior. Previous investigations have studied the behavior of friction devices subject to the types of low frequency excitations but not under loads with low frequencies and small displacements. This research sought to provide insight into the behavior of the MFD under real-world conditions by building and testing the variable friction element used in the MFD. To that end, a testing apparatus for a variable friction element was built from an automotive drum brake; the design, building process, and testing are described in detail. While data indicate that an adjustment may need to be made to previous friction models used for the MFD, the physical limitations of the device created for the study prevent this research from reaching conclusive results regarding friction behavior of the MFD. However, experienced gained allows for conclusions about the design of the MFD. Effectively converting linear motion into rotation in the drum is crucial to the MFD's operation: without this, the brake cannot dissipate energy. The design used for this study used friction between the drum and the face of a column to rotate the brake; this friction was not sufficient to prevent slippage. Instead of relying on friction, future MFD designs should utilize a gear or other more mechanically robust system to generate rotation in the drum.
by Robert Marne Zahner.
M.Eng.
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Chen, K. Z., F. Wang, X. Y. Feng, and X. A. Feng. "Behavior modeling for the spraying device in the layered manufacturing process." Journal for New Generation Sciences, Vol 4, Issue 1: Central University of Technology, Free State, Bloemfontein, 2006. http://hdl.handle.net/11462/485.
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Published ArticleA component, which has a perfect combination of different materials (probably including homogeneous materials and three different types of heterogeneous materials) in its different portions for a specific application, is considered as the component made of a multiphase perfect material. To fabricate such components, a hybrid layered manufacturing process has been developed. In order to accurately spray different materials with their required volume fractions for every pixel during fabrication, it is important to investigate its spraying operation. This paper establishes the behavior model of the spraying device and proves its validity using digital simulations.
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Xing, Yang. "Asymptotic behavior of Bayesian nonparametric procedures /." Umeå : Dept. of Forest Economics, Swedish University of Agricultural Sciences, 2009. http://epsilon.slu.se/200935.pdf.
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Sessions, Sharon Lynn. "Quantum critical behavior of disordered itinerant ferromagnets /." view abstract or download file of text, 2002. http://wwwlib.umi.com/cr/uoregon/fullcit?p3055712.
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Thesis (Ph. D.)--University of Oregon, 2002.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 223-225). Also available for download via the World Wide Web; free to University of Oregon users.
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Nieto, Barthaburu Augusto. "Essays on microeconomics and statistical decision making." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3196546.
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Thesis (Ph. D.)--University of California, San Diego, 2006.Title from first page of PDF file (viewed February 28, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.
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Husowitz, Barry Charles. "Effect of Confinement and Heterogeneity on Phase Behavior: A Density Functional Approach." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/196124.
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Density functional theory of statistical mechanics in a square gradient approximation was used to study nucleation in confined systems such as a cylindrical pore and in-between two cylindrical disks. This approximation was further applied to study the evaporation and condensation in nanopores with finite lengths. Confinement effects induced nucleation phenomena that are not observed in more open systems. Density functional theory was also used to explore the solvation properties of a spherical solute immersed in a supercritical diatomic fluid. The solute was modeled as a hard core Yukawa particle surrounded by a diatomic Lennard-Jones fluid represented by two fused tangent spheres using an interaction site approximation. The results of this study indicate that local density augmentation and the solvation free energies are particularly sensitive to changes in solute and solvent particle geometry and solute/solvent anisotropic interactions. Density functional theory allowed us to systematically study the effect of a variety of geometric and interaction parameters on the properties and behavior of all the systems. Although more sophisticated, but computationally more demanding, theoretical approaches can be used, our results provide fundamental physical insights into the behavior of real systems and create a solid basis for the development of more realistic models.
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Bynum, Lucius. "Modeling Subset Behavior: Prescriptive Analytics for Professional Basketball Data." Scholarship @ Claremont, 2018. https://scholarship.claremont.edu/hmc_theses/117.
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Sports analytics problems have become increasingly prominent in the past decade. Modern image processing capabilities allow coaching staff to easily capture detailed game-time statistics on their players, opponents, team configurations, and plays. The challenge is to turn that data into meaningful insights for team managers and coaches. This project uses descriptive and predictive techniques on publicly available NBA basketball data to identify powerful combinations of players and predict how they will perform against other teams.
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DERSTINE, MATTHEW WILLIAM. "OBSERVATION OF CHAOS IN A HYBRID OPTICAL BISTABLE DEVICE (PERIOD-DOUBLING)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187930.
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An analog of an optically bistable device made constructed from both optical and electronic components is used to study chaos. This hybrid optically bistable system has a delay in the feedback so that the response time of the electronics is much faster than the feedback time. Such a system is unstable and shows pulsations and chaos. The character of the pulsations change as the gain of the amplifier or the input laser power is increased. These changes make up the period doubling route to chaos. Not all of the waveforms of an ideal period doubling sequence are observed. This truncation of the period-doubling sequence in the device is investigated as a function of the noise present in the system. Increasing the noise level decreases the number of period doublings observed. In the chaotic regime waveforms other than those predicted are observed. These waveforms are the frequency-locked waveforms seen in an earlier experiment which we find to be modified versions of the typical period-doubled waveforms. The transitions between these waveforms are discontinuous, and show hysteresis loops. By the introduction of an external locking signal, we are able to stabilize waveforms in the neighborhood of the discontinuous transitions. By so doing we show that the transitions among the branches are due to their lack of stability. The transitions are thus not strictly first-order nonequilibrium phase transitions, since in that case the branches cease to exist at the transition point. Since the path to chaos is nonunique, the types of chaos that are observable are also nonunique. To suggest a way to distinguish between different types of chaos and also to provide a tool for the study of chaos in other systems, we propose an operational test for chaos which leads to a straightforward experimental distinction between chaos and noise. We examine this test using the hybrid device to show that the method works. The test involves repeated measurement of the initial transient of a system whose initial condition is fixed. This method could be used to determine the existence of chaos in faster optical systems.
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Tan, Leong Hin 1957. "Two-dimensional device simulation of junction termination structures for determination of breakdown behavior." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277067.
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In this work, we have investigated numerical techniques to determine the breakdown behavior of complex semiconductor devices using two-dimensional simulation. In particular, we have augmented the device simulator SEPSIP with a capability for handling single and multiple floating field rings, and for handling devices with slanted edges. We have furthermore improved the grid width selection algorithm in SEPSIP. A capability for plotting equi-field contours was added to the code. Finally, all system dependencies were removed from the SEPSIP code, and a new version of SEPSIP (Version 2.0) was generated which can be executed on any PC/XT, PC/AT, or PC/386 compatible computer. This eliminates the need for transfering files back and forth between the PC, which had formerly been used as an I/O processor, and the VAX, which was used for numerically intensive computations. It also makes the code more accessible to scientists and engineers who are working in this important research area.
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Lu, Ching-Huang. "Bilayer metal gate electrodes with tunable work function : behavior, mechanism, and device characteristics /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
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Kunz, Alexander [Verfasser]. "Controlling Charge Carrier Trapping in Polymeric Semiconductors : Connecting Morphology to Device Behavior / Alexander Kunz." Mainz : Universitätsbibliothek der Johannes Gutenberg-Universität Mainz, 2021. http://d-nb.info/1231433507/34.
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TEIXEIRA, PEDRO BARONI DA COSTA. "MECHANICAL BEHAVIOR AND STABILITY OF THE INTERNAL MEMBRANE OF THE INCOR VENTRICULAR ASSIT DEVICE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2001. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1984@1.
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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOO objetivo desta dissertação é caracterizar o comportamento mecânico da membrana interna do Dispositivo de Assistência Ventricular do Instituto do Coração, DAV - InCor, pela aplicação do arcabouço e das ferramentas da análise estrutural. Esta membrana tem um papel importante na operação do DAV-InCor, pois separa a câmara onde penetra o sangue daquela onde ocorre o acionamento pneumático, desta forma transmitindo a carga pneumática ao sangue presente na outra câmara. Este carregamento se repete ciclicamente. Conseqüentemente, o desempenho, confiabilidade e durabilidade da membrana são críticos para o bom funcionamento deste aparelho. O modelo matemático é fundamentado na Teoria das Grandes Deformações para cascas finas, e na análise por elementos finitos. O fenômeno de snap through, associado a instabilidade à flambagem, foi observado na membrana quando modelada matematicamente, assim como por via experimental. As tensões principais e as deformações da membrana foram obtidas para determinados níveis de carregamento ao longo dos caminhos de equilíbrio pré e pós flambagem.
The aim of this dissertation is to characterize and analyse the mechanical behavior of the internal membrane of the (Brazilian) Heart Institute's Ventricular Assist Device, VAD-InCor, through application of the knowledge and tools of structural engineeering analysis. This membrane plays an important role in the mechanical operation of the VAD-InCor, since it separates the blood chamber from the pneumatic chamber, transmitting a pneumatic load to the blood that has entered the blood chamber. The load repeats itself cyclicaly. Therefore the performance, reliability and durability of the membrane are critical for the full functioning of the VAD. The mathematical model is based on the large strain theory of thin shells and on the finite element method. The snap through instability phenomenon, which is responsible for transmission of the pneumatic load to the blood, was observed in the membrane when modeled mathematically and experimentally. Principal stresses and strain distributions were obtrained with this model, at certain load levels along the pre- and post-buckling paths.
EL objetivo de esta disertación es caracterizar el comportamiento mecánico de la membrana interna del Dispositivo de Asistencia Ventricular del Instituto del Corazón, DAV InCor, por la aplicación del arcabozo y de las herramientas de análisis extructural. Esta membrana tiene un papel importante en la operación del DAV InCor, ya que separa la cámara por donde penetra la sangre de la cámara donde ocurre el accionamiento neumático, transmitiendo la carga neumática a la sangre que se encuentra en la otra cámara. Esta carga se repite ciclicamente. Consecuentemente, el desempeño, confiabilidad y durabilidad de la membrana son críticos para el buen funcionamiento de este equipo. EL modelo matemático se fundamenta en la Teoría de las Grandes Deformaciones para cascas finas, y en el análisis por elementos finitos.
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Yilmazel, Canan. "Analysis Of High Frequency Behavior Of Plate And Beam Structures By Statistical Energy Analysis Method." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605133/index.pdf.
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Statistical Energy Analysis (SEA) is one of the methods in literature to estimate high frequency vibrations. The inputs required for the SEA power balance equations are damping and coupling loss factors, input powers to the subsystems. In this study, the coupling loss factors are derived for two and three plates joined with a stiffener system. Simple formulas given in the literature for coupling loss factors of basic junctions are not used and the factors are calculated from the expressions derived in this study. The stiffener is modelled as line mass, Euler beam, and open section channel having double and triple coupling. Plate is modelled as Kirchoff plate. In the classical SEA approach the joint beam is modelled as another subsystem. In this study, the beam is not a separate subsystem but is used as the characteristics of the joint and to calculate the coupling loss factor between coupled plates. Sensitivity of coupling loss factors to system parameters is studied for different beam approaches.
The derived coupling loss factors and input powers are used to calculate the subsystem energies by SEA. The last plate is joined to the first one to simulate the fuselage structure. A plate representing floor structure and acoustic volume are also added. The different modelling types are assessed by applying pressure wave excitation. It is shown that deriving the parameters as given in this study increases the efficiency of the SEA method.
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Howes, Karsten. "Lattice gases in statistical physics : a study of phase separation, critical behavior and other phenomena." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68184.
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The studies which are presented here are computer simulations of fluid phenomena based on 2D lattice gas models of the kind first described by Frisch et al. (1986). The primary advantage of using these models is that they are easily implemented on massively parallel computers and as a result are extremely fast.The first of these studies is of a model of phase separation in binary fluids. The growth laws of the fluid domains are examined and are shown to compare favourably to theoretical predictions of San Miguel et al. (1985). This appears to be a first verification of these results. The second study is of the critical behavior of a system of binary fluids. The model is shown to have a phase transition and the critical temperature is determined with an accuracy of 1%. Several critical exponents are also determined and evidence is provided that the model falls into the 2D Ising model universality class. A new model of fluid convection is also presented though no concrete results are yet available for this model.
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Blackwell, Keith. "Entropy Constrained Behavior in Financial Markets A Quantal Response Statistical Equilibrium Approach to Financial Modeling." Thesis, The New School, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10823347.
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Quantal Response Statistical Equilibrium (QRSE) models the joint probability distribution of asset returns and entropy constrained buy/sell decisions of investors and in doing so offers a behavioral foundation for many of the stylized facts we commonly observe in the distributions of asset returns and economic data such as fat-tails, excess peakedness, and skew. In a QRSE market model, investors condition the distribution of probabilistic buy/sell decisions on the extent to which investments offer above or below average returns. By modeling both returns and actions as probabilistic, QRSE is able to explain the marginal distributions of asset returns as the result of two opposing forces: 1) informational shocks that act as an underlying “natural” source of dispersion; 2) the tendency of investors to buy low/sell high that causes a mean-reversion dynamic, which decreases the entropy of the returns distribution we actually observe.
In this thesis, I introduce three new QRSE distributions each derived using the Maximum Entropy Principle. The first is a simple three parameter symmetric QRSE distribution that can fit and, therefore, provide a behavioral foundation for many commonly observed distributions including the Laplace, Gaussian, Logistic, and Student's T distributions. I then introduce a generalized maxent QRSE framework for expanding the assumptions of the basic model. I use this framework to derive two additional QRSE models that allow for skew: one that assumes skew is an implicit characteristic of the underlying data generating process and one that assumes that skew is due to asymmetric buy/sell preferences of investors. I also include two empirical applications. First, I apply QRSE to cross-sectional US equity returns. Second, I apply QRSE to 10 year US Treasury yields in a multiple equilibrium setting using a QRSE hidden Markov model.
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Zhang, Zhe S. M. Sloan School of Management. "A statistical analysis of the potential impact of Boeing 737 MAX crashes on passenger behavior." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127001.
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Thesis: S.M. in Management Research, Massachusetts Institute of Technology, Sloan School of Management, May, 2020Cataloged from the official PDF of thesis.
Includes bibliographical references (page 47).
There were two fatal air crashes in 2018 and 2019, Lion Air Flight 610 and Ethiopian Airlines Flight 302; aircraft type of both crashes was Boeing 737 MAX 8. In the aftermath of the two crashes, the Boeing 737 MAX 8 was grounded globally. According to the latest announcement of the Federal Aviation Administration (FAA), the MAX will be grounded until the summer of 2020. After the grounding, the MAX will return to the fleets of airlines in North America, such as American Airlines and Air Canada. However, will travelers accept this aircraft type as before? Or, to what extent travelers will avoid flying the MAX? The purpose of this thesis is to use statistical methods to quantify travelers' avoidance of MAX. Based on the booking data of American Airlines (AA) and Air Canada (AC), I use three metrics to measure travelers' attitudes, including bookings of the targeted flights, total daily bookings, and the proportions of bookings. The findings of the current study on two routes of AA and AC didn't reveal any statistically significant evidence of MAX avoidance on any of three key metrics. Accordingly, I concluded that the specific customer segment in this thesis didn't show a clear avoidance of MAX.
by Zhe Zhang.
S.M. in Management Research
S.M.inManagementResearch Massachusetts Institute of Technology, Sloan School of Management
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Mann, Richard Philip. "A statistical survey of transitional device usage among writers of English as a second language and native writers of English /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu148726601122525.
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Elarabi, Asem S. Amar. "Polarization behavior of high-Tc superconducting terahertz emitters." Kyoto University, 2018. http://hdl.handle.net/2433/235090.
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Gude, Michael Thomas. "The critical properties and near-critical phase behavior of dilute mixtures." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/11206.
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Ho, Ki-hiu, and 何其曉. "Extracting real market behavior in complex adaptive systems through minority game." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30163705.
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Rasuba, Maanda. "Statistical relationship of customer behavioral characteristics in personal banking." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1165.
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This study investigates the relationship of bank customers’ behavioural patterns based on the customers past transactions, with respect to their profile characteristics. The main aim of this study is to illustrate that different categories of customers (based on demographical variables such as race, gender and age) have statistically significant differences in behaviour, with respect to how they operate their accounts. A theoretical overview on the literature of customer relationship management in the banking sector emphasises the importance of understanding customers to ensure that a business is successful. Four null-hypotheses where formulated based on a general research hypothesis. The data base provided a major South African bank is used to achieve the objectives. Extensive cleaning of the data set was necessary to ensure the validity of the results. The data set had 7860 customer keys. The large data base used contributed to the reliability of the results. The following behavioural variables were used in the study namely, transaction data, average debit and credit transaction amounts and average number of transactions per month. The main results of study indicate that different customer categories have statistically significant differences in behaviour, with respect to how customers operate their accounts. This implies that it is important for the banking sector to consider customer gender differences, age differences and race group differences in the relationship strategies which they employ in their multicultural environment. Further research in the area may be necessary before generalisation can be made on all banking customers.
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Tvedt, Valerie Maria. "Some factors that effect [sic] statistical power in ANCOVA: a population study." CSUSB ScholarWorks, 2000. https://scholarworks.lib.csusb.edu/etd-project/1764.
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A study into the factors that affect power in an analysis of covariance (ANCOVA) design were examined. Four factors - sample size, significance level, dependent variable-covariate correlations and homogeneity of regression - were varied in a population study. Results indicate that power increased when the dependent variable-covariate correlations increased and when sample size increased. Power also increased when a less stringent alpha level was used. Homogeneity of regression did not effect power. Implications and recommendations for the applied researcher are discussed.
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Giwah, Anthony Duke. "Empirical Assessment of Mobile Device Users’ Information Security Behavior towards Data Breach: Leveraging Protection Motivation Theory." Diss., NSUWorks, 2019. https://nsuworks.nova.edu/gscis_etd/1073.
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User information security behavior has been an area of growing demand in information systems (IS) research. Unfortunately, most of the previous research done in user information security behavior have been in broad contexts, therefore creating a gap in the literature of similar research that focuses on specific emerging technologies and trends. With the growing reliance on mobile devices to increase the flexibility, speed and efficiency in how we work, communicate, shop, seek information and entertain ourselves, it is obvious that these devices have become data warehouses and platform for data in transit.
This study was an empirical and quantitative study that gathered data leveraging a web-survey. Prior to conducting the survey for the main data collection, a Delphi study and pilot study were conducted. Convenience sampling was the category of nonprobability sampling design used to gather data. The 7-Point Likert Scale was used on all survey items. Pre-analysis data screening was conducted prior to data analysis. The Partial Least Square Structural Equation Modeling (PLS-SEM) was used to analyze the data gathered from a total of 390 responses received.
The results of this study showed that perceived threat severity has a negative effect on protection motivation, while perceived threat susceptibility has a positive effect on protection motivation. Contrarily, the results from this study did not show that perceived response cost influences protection motivation. Response efficacy and mobile self-efficacy had a significant positive influence on protection motivation. Mobile device security usage showed to be significantly influenced positively by protection motivation. This study brings additional insight and theoretical implications to the existing literature. The findings reveal the PMT’s capacity to predict user behavior based on threat and coping appraisals within the context of mobile device security usage. Additionally, the extension of the PMT for the research model of this study implies that mobile devices users also can take recommended responses to protect their devices from security threats.
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Jones, A.-Andrew D. III (Akhenaton-Andrew Dhafir). "Design of a microfluidic device for the analysis of biofilm behavior in a microbial fuel cell." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/88279.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 83-90).
This thesis presents design, manufacturing, testing, and modeling of a laminar-flow microbial fuel cell. Novel means were developed to use graphite and other bulk-scale materials in a microscale device without loosing any properties of the bulk material. Micro-milling techniques were optimized for use on acrylic to achieve surface roughness averages as low as Ra = 100nm for a 55 [mu]m deep cut. Power densities as high as 0.4mW · m⁻², (28mV at open circuit) in the first ever polarization curve for a laminar-flow microbial fuel cell. A model was developed for biofilm behavior incorporating shear and pore pressure as mechanisms for biofilm loss. The model agrees with experimental observations on fluid flow through biofilms, biofilm structure, and other biofilm loss events.
by A-Andrew D. Jones, III.
S.M.
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Watt, Grace R. "Impact of Device Parametric Tolerances on Current Sharing Behavior of a SiC Half-Bridge Power Module." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/96559.
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This paper describes the design, fabrication, and testing of a 1.2 kV, 6.5 mΩ, half-bridge, SiC MOSFET power module to evaluate the impact of parametric device tolerances on electrical and thermal performance. Paralleling power devices increases current handling capability for the same bus voltage. However, inherent parametric differences among dies leads to unbalanced current sharing causing overstress and overheating. In this design, a symmetrical DBC layout is utilized to balance parasitic inductances in the current pathways of paralleled dies to isolate the impact of parametric tolerances. In addition, the paper investigates the benefits of flexible PCB in place of wire bonds for the gate loop interconnection to reduce and minimize the gate loop inductance. The balanced modules have dies with similar threshold voltages while the unbalanced modules have dies with unbalanced threshold voltages to force unbalanced current sharing. The modules were placed into a clamped inductive DPT and a continuous, boost converter. Rogowski coils looped under the wire bonds of the bottom switch dies to observe current behavior. Four modules performed continuously for least 10 minutes at 200 V, 37.6 A input, at 30 kHz with 50% duty cycle. The modules could not perform for multiple minutes at 250 V with 47.7 A (23 A/die). The energy loss differential for a ~17% difference in threshold voltage ranged from 4.52% (~10 µJ) to -30.9% (~30 µJ). The energy loss differential for a ~0.5% difference in V_th ranged from -2.26% (~8 µJ) to 5.66% (~10 µJ). The loss differential was dependent on whether current unbalance due to on-state resistance compensated current unbalance due to threshold voltage. While device parametric tolerances are inherent, if the higher threshold voltage devices can be paired with devices that have higher on-state resistance, the overall loss differential may perform similarly to well-matched dies. Lastly, the most consistently performing unbalanced module with 17.7% difference in V_th had 119.9 µJ more energy loss and was 22.2°C hotter during continuous testing than the most consistently performing balanced module with 0.6% difference inV_th.Master of Science
This paper describes the design, construction, and testing of advanced power devices for use in electric vehicles. Power devices are necessary to supply electricity to different parts of the vehicle; for example, energy is stored in a battery as direct current (DC) power, but the motor requires alternating current (AC) power. Therefore, power electronics can alter the energy to be delivered as DC or AC. In order to carry more power, multiple devices can be used together just as 10 people can carry more weight than 1 person. However, because the devices are not perfect, there can be slight differences in the performance of one device to another. One device may have to carry more current than another device which could cause failure earlier than intended. In this research project, multiple power devices were placed into a package, or "module." In a control module, the devices were selected with similar properties to one another. In an experimental module, the devices were selected with properties very different from one another. It was determined that the when the devices were 17.7% difference, there was 119.9 µJ more energy loss and it was 22.2°C hotter than when the difference was only 0.6%. However, the severity of the difference was dependent on how multiple device characteristics interacted with one another. It may be possible to compensate some of the impact of device differences in one characteristic with opposing differences in another device characteristic.
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Russo, Lori A. "The Effects of a Tactile Prompting Device on the Requesting Behavior of a Child with Autism." Thesis, University of North Texas, 1999. https://digital.library.unt.edu/ark:/67531/metadc2433/.
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In the present experiment, a remote control tactile prompting device (RCT) was utilized to prompt a child with autism to recruit teacher models and play suggestions. A multiple baseline and reversal was used to assess the effects of the RCT across three play contexts. The results showed increases in the number of requests for models and suggestions as well as increases in the duration of interactive play between the child and therapist, the number of contextual statements emitted by the child, and the topography and contexts of the play behaviors emitted by the child. Findings are discussed in terms of the effectiveness and generality of the RCT and the issue of teaching a child to recruit versus teaching a child activity-specific behaviors.
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Scuderi, Marco Giovanni. "Bayesian approaches to learning from data how to untangle the travel behavior and land use relationships." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/3201.
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Thesis (Ph. D.)--University of Maryland, College Park, 2005."Bayesian scoring is used to evaluate and compare results from actual data collected for the Baltimore Metropolitan Area with the set of predominant conceptual frameworks linking travel behavior and land use obtained from the literature"--Abstract. Includes bibliographical references (p. 167-176) and abstract.
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Bolechala, Arica J. "Evaluating the Effectiveness of the Travel Assistance Device on the Bus Riding Behavior of Individuals with Disabilities." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1576.
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Independence for individuals with disabilities can be facilitated through the use of devices that have been created and adapted for these individuals. Research regarding the use of technology to afford independence to those with disabilities is growing as new devices are being created. One such device is the Travel Assistance Device (TAD) which has undergone conceptual tests to assess if the individual components of the device work as intended. The purpose of this research study was to determine whether the prompts given by the TAD would exhibit stimulus control over the participant's behavior of pulling the cord to stop the bus at the appropriate time and exiting the bus at the appropriate stop. Results show favorable outcomes for the 3 participants who were able to pull the bus cord at the appropriate stops and exit the bus only when the TAD delivered prompts. Future implications in parent training are discussed.
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Mun, Byoung-Jae. "Unsaturated soil behavior under monotonic and cyclic stress states." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1361.
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The objectives of this dissertation are to measure and calculate surface free energies of soil particles, to understand the mechanical behavior of unsaturated silty sand through first studying the stress-strain relationship, the effects of matric suction and pore water chemistry and second to interpret the behavior by the critical state frame work, to develop a method to predict cone tip resistance in unsaturated soils, and to present the concept of pseudo strain and dissipated pseudo strain energy.
Universal Sorption Device (USD) is developed to measure surface free energies of soil particles. The test results on a soil sample shows that specific surface area increased with decreasing particle size. The components of surface free energies and the work of adhesion increased with decreasing particle size.
A servo controlled triaxial testing device is developed to test 15.24 cm in height and 7.62 cm in diameter, recompacted specimens of unsaturated soil under varying matric suction and different pore chemistry. During the test, the matric suction is maintained constant. Results from the triaxial drained tests are used for validation of the constitutive models proposed by Alonso et al. (1990). Predictions from the model are in good agreement with experimental results.
The critical state model for unsaturated soil is used to calculate cone tip resistance in unsaturated silty sand. The calculated cone tip resistance is used to evaluate the liquefaction potential of unsaturated soils. The results from the stress based liquefaction potential analysis reveal that even in an unsaturated condition soil is susceptible to liquefaction.
By applying the pseudo strain concept, it is possible to account for the viscous resistance of water during cyclic loading. The results of undrained cyclic triaxial tests are used to calculate pseudo-strain and dissipated pseudo strain energy. The results of calculated dissipated pseudo strain energy suggest that the effect of initial matric suction is evident. On the other hand, the effect of surface tension increase or decrease due to existence of chemical on the pore water is negligible.
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Theurkauff, Isaac. "Collective Behavior of active colloids." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10251/document.
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Nous étudions le comportement collectif d'une assemblée de colloïdes Janus, des sphères d'or de 1µm dont une moitié est recouverte de platine. Lorsqu'ils sont immergés dans une solution d'eau oxygénée, ils se déplacent à des vitesses de l'ordre de 5µm/s, contrôlable par la concentration en peroxyde. Individuellement, ces colloïdes suivent une marche aléatoire persistante ; Ils interagissent par effets phorétiques, formant des clusters dynamiques de quelques dizaines de colloïdes. Ces clusters, mobiles, échangent continuellement des colloïdes, se divisent et se fusionnent, formant une phase stationnaire. Nous avons développés ces colloïdes, ainsi qu'un système d'acquisition pour détecter et reconstituer les trajectoires des colloïdes. La taille moyenne des clusters augmente linéairement avec l'activité, définie comme la vitesse moyenne des colloïdes en dehors des clusters. La fonction densité de probabilité de la taille des clusters est une loi de puissance d'exposant -2. Nous quantifions les vitesses de translation et de rotation des clusters. Pour réaliser une étude thermodynamique, nous réalisons des expériences de sédimentation. Une transition est observée, entre une phase peu dense, un gaz parfait, dans lequel on mesure une température effective, et une phase dense à la dynamique hétérogène. L'équation d'état du système est mesurée, et une forme analytique heuristique est proposéeWe study the collective behavior of an assembly of Janus Colloids. These are 1µm gold colloids with one half coated in platinum. When immersed in a peroxide bath, they self-propel, owing to diffusiophoresis and electrophoresis, moving at velocities of order 5µm/s. The velocity can be tune by adjusting the amount of peroxide in the bath. At the single particle level, the colloids undergo a persistent random walk. When in denser groups, the colloids interact through chemical and steric effects. The combination of these interactions, with the colloids activity, leads to collective effects. A dynamic cluster phase is observed, the formation of motile clusters of colloids, formed of up to 100 colloids. The clusters are in a stationary state, constantly moving, and exchanging colloids, they are also colliding, merging and breaking apart. We developed both the colloids, whose synthesis is described, and a high-throughput acquisition and analysis system. We measure the positions, and reconstruct the trajectories of thousands of colloids for a few minutes. From the trajectories, we extract statistical observables. We show that the sizes of clusters increases linearly as a function of the activity of the colloids. The probability distribution functions of sizes are power laws. As the density increases, a jamming transition is observed. The dense phase heterogeneous dynamics is characterized. We study the transition from the dense phase to a low density assembly with sedimentation experiments. The low density phase behaves as an ideal gas, allowing the definition of an effective temperature. We measure an equation of state for the system, and propose a heuristic collapse
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Lim, Tzi-shing Jesse. "Behavior of a Ni-Ti shape memory alloy under cyclic proportional and nonproportional loading." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/15910.
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White, Mel. "Information Seeking Behaviors in a Population of Assistive Mobility Device Users." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc799517/.
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The author explores the current state of information exchange and access in the procurement process for mobility assistive equipment. While the idealized model is of a linear process starting with a need and ending with the purchase, in practice the procedures for acquiring a device such as a wheelchair or electric scooter can be a time consuming task that involves client, family, medical care specialists, vendors, manufacturers, insurance companies and possibly alternate sources of funding. This study utilized Participatory Action Research (PAR) to collect both qualitative and quantitative data about information sources such as the Internet, the medical community, and vendors. The findings of this study suggest that in spite of the presence of the Internet, overall primary sources are similar to the traditional model and that for most there is no one source that could be easily accessed for information. A brief examination is made of the “Information landscape” utilized in the process and a brief discussion of two relatively unmentioned information sources: expos and the wheelchair sports community.
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Sproat, Brittany Anne. "Music Listening Behavior, Health, Hearing, Otoacoustic Emission Levels." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1399303027.
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Lazo, Fuentes César Reinaldo. "A first-principles statistical mechanics study of the ordering behavior of hydrogen on Pd(111) at low temperatures /." [S.l. : s.n.], 2007. http://www.gbv.de/dms/ilmenau/toc/524537550.PDF.
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Suberman, Rachel. "Teaching Caregivers to Implement Speech-Generating Device-Based Mand Training: Evaluating the Efficacy of Behavioral Skills Training." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/7094.
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Many individuals with developmental disabilities do not develop vocal repertoires. Thus, teaching the use of an augmentative and alternative communication (AAC) device is imperative. A speech-generating device (SGD) is an example of an AAC that is universally understood. Individuals with developmental disabilities have been taught to communicate using such device. Teaching caregivers to conduct communication training with their children may be one to way to foster communication in an individual’s natural environment. Thus, the purpose of this study was to extend previous research by using behavioral skills training (BST) to teach caregivers to implement SGD-based mand training using an adapted training sequence. Additionally, we evaluated whether training caregivers to implement mand training with their children resulted in an increase of independent mands in their children. This study found that BST was effective in teaching caregivers to implement SGD-based mand training with their children. Additionally, independent mands increased from pre-training to post-training observations for two children.
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Hall, Jonathan A. "Geographic Factors of Residential Burglaries - A Case Study in Nashville, Tennessee." TopSCHOLAR®, 2010. http://digitalcommons.wku.edu/theses/229.
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This study examines geographic patterns and geographic factors of residential burglary at the Nashville, TN area for a twenty year period at five year interval starting in 1988. The purpose of this study is to identify what geographic factors have impacted on residential burglary rates, and if there were changes in the geographic patterns of residential burglary over the study period. Several criminological theories guide this study, with the most prominent being Social Disorganization Theory and Routine Activities Theory. Both of these theories focus on the relationships of place and crime. A number of spatial analysis methods are hence adopted to analyze residential burglary rates at block group level for each of the study year. Spatial autocorrelation approaches, particularly Global and Local Moran's I statistics, are utilized to detect the hotspots of residential burglary. To understand the underlying geographic factors of residential burglary, both OLS and GWR regression analyses are conducted to examine the relationships between residential burglary rates and various geographic factors, such as Percentages of Minorities, Singles, Vacant Housing Units, Renter Occupied Housing Units, and Persons below Poverty Line.
The findings indicate that residential burglaries exhibit clustered patterns by forming various hotspots around the study area, especially in the central city and over time these hotspots tended to move in a northeasterly direction during the study period of 1988-2008. Overall, four of the five geographic factors under examination show positive correlations with the rate of residential burglary at block group level. Percentages of Vacant Housing Units and Persons below Poverty Line (both are indicators of neighbor economic well-being) are the strong indicators of crime, while Percentages of Minorities (ethnic heterogeneity indictor) and Renter Occupied Housing Units (residential turnover indictor) only show modest correlation in a less degree. Counter-intuitively, Percentage of Singles (another indicator of residential turnover) is in fact a deterrent of residential burglary; however, the reason for this deterrence is not entirely clear.
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Johnson, Elizabeth. "The Effects of a Self-Monitoring Package Using a Tactile Cueing Device on Student On-Task Behavior in Special Education and General Education Settings." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/75.
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Research has shown that self-monitoring can be effective in different settings and with a range of students as well as problem behaviors. However, teachers who use self-monitoring techniques have difficulties in using an effective cueing system as well as generalizing the newly acquired skill into the general education classroom. This study extends the literature by utilizing a tactile cueing device to increase the percentage of intervals of on-task behavior as well as increasing the intervals of on-task behavior in an inclusive general education classroom setting.
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Kumar, Amit. "Morphology, Crystallization and Melting Behavior of Statistical Copolymers of Propylene with Ethylene, 1-Butene, 1-Hexene and 1-Octene." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/33563.
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In this thesis, the morphology, crystallization and melting behavior of polypropylene copolymers (propylene/ethylene, propylene/1-butene, propylene/1-hexene and propylene/1-octene) has been examined. The multiple melting behavior has been correlated with the presence of alpha and gamma phases and with the occurrence of cross-hatching morphology. The Crystallization and melting behavior of propylene/ethylene and propylne/1-butene are qualitatively similar and compatible with the expectations that the ethylene and butene comonomers are partly included in the propylene lattice. Propylene/1-hexene and propylene/1-octene copolymers exhibit remarkably similar behavior and morphologies consistent with the expectations that the hexene and the octene comonomers are rigorously excluded from the crystal lattice.
The origin and the crystallization time dependence of the multiple melting behavior is very different for these two pairs of copolymers. For PE and PB it is consistent with the melting of parent a-phase lamellae and alpha or gamma-phase daughter lamellae. For PH and PO copolymers it is very similar to that observed for ethylene-octene(EO) and ethylene-styrene(ES) copolymers and compatible with the melting of primary lamellae and secondary mosaic or fringed micellar structures.Master of Science
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Lin, Jia-chun, and 林家醇. "Statistical Optimization Modeling in Fabricating MOSFET Device." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/28283107277902556659.
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碩士國立臺南大學
電機工程研究所
99
In this thesis, a statistical optimization modeling is proposed to investigate the effect of the critical factors in the process of the 90nm and 65nm MOSFET devices. The electrical properties and correlation of the principal factors, are simulated based on exploratory factor analysis (EFA). From those results, optimization parameters are extracted to meet the requirements. TCAD SILVACO simulator was used to simulate electrical properties in the process of the 90nm and 65nm n-channel MOSFET structure. Research results are concluded as follows. (1)A systematic method describing the statistical optimization of the electrical parameters for MOSFET device is demonstrated. (2) It is very hard to find the suitable parameters when the threshold voltage goes smaller as the device size decreases. Different models are required to verify the validness of the extracted data. (3) EFA history score has been established for future reference.