Littérature scientifique sur le sujet « Theoretical matching model »
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Articles de revues sur le sujet "Theoretical matching model"
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Miller, Norman, William C. Pedersen, Mitchell Earleywine et Vicki E. Pollock. « A Theoretical Model of Triggered Displaced Aggression ». Personality and Social Psychology Review 7, no 1 (février 2003) : 75–97. http://dx.doi.org/10.1207/s15327957pspr0701_5.
Texte intégralRésumé :
A tit-for-tat matching rule (Axelrod, 1984) describes much interpersonal behavior. Yet, in daily lift a retaliatory aggressive response to a trivially mild provocation often inappropriately exceeds that expected from the matching rule. The concept of triggered displaced aggression can explain these exceptions to the matching principle. Building from the Cognitive Neoassociationistic model of aggressive behavior (Berkowitz, 1989, 1990, 1993), we developed a theoretical framework of social and personality factors that moderate and mediate the disjunctively escalated retaliation that can result from triggered displaced aggression. Major explanatory factors in our analysis of such effcts are as follows: (a) aspects of the Time 1 provocation and the immediate situation in which it occurred; (b) characteristics of initial provocations and personality factors of the actor that produce the ruminative thought that will temporally extend the effects of a Time 1 provocation, allowing them to interact with a delayed Time 2 minor triggering event; and (c) actions and attributes of the target of displaced aggression that augment these effects.
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REITSMA-STREET, MARGE, et ALAN W. LESCHIED. « The Conceptual-Level Matching Model in Corrections ». Criminal Justice and Behavior 15, no 1 (mars 1988) : 92–108. http://dx.doi.org/10.1177/0093854888015001008.
Texte intégralRésumé :
The Conceptual-Level Matching Model (CLMM) is reviewed with a focus to its application in the development of treatment/rehabilitation programs with offender groups. The CLMM is a theoretical model describing outcomes from hypothesized interactions between a person variable, conceptual level, in interaction with differing types of environments described in terms of structure. Reliability and validity of both CL and the matching model are presented with emphasis given to a review of studies involved with CL and offender groups. On both theoretical and empirical grounds, the CLMM holds considerable promise as a means of organizing offender programs to elicit optimum effectiveness from existing resources.
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Huang, Hao, Yide Liu et Dong Lu. « Proposing a model for evaluating market efficiency of OTAs : Theoretical approach ». Tourism Economics 26, no 6 (21 juin 2019) : 958–75. http://dx.doi.org/10.1177/1354816619853114.
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As one of the most popular exchange intermediary for travel products, the online travel agencies (OTAs) compete fiercely. Previous studies on the OTA market efficiency focus on the travel product prices and distribution channels competition, but contradictions and paradoxes can be found between the theoretical explanations and empirical results. This article proposed a theoretical model by identifying two determinants of the OTA market efficiency: the matching ability and market size. The study shows that (1) the matching ability improves the market efficiency by enlarging the market size and increasing the effective range of competition; (2) the comparative advantage in matching ability of one OTA will lead to the efficiency occupation of other OTAs; and that (3) new OTAs or long tail travel products may reduce market efficiency, but it provides the opportunity to reconstruct the traditional industrial chain. This study enriches the economic theory of OTA and provides commercial guides for practice.
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McGloin, Rory, Joe A. Wasserman et Andy Boyan. « Model Matching Theory : A Framework for Examining the Alignment between Game Mechanics and Mental Models ». Media and Communication 6, no 2 (7 juin 2018) : 126–36. http://dx.doi.org/10.17645/mac.v6i2.1326.
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The primary aim of this article is to provide a comprehensive review and elaboration of model matching and its theoretical propositions. Model matching explains and predicts individuals’ outcomes related to gameplay by focusing on the interrelationships among games’ systems of mechanics, relevant situations external to the game, and players’ mental models. Formalizing model matching theory in this way provides researchers a unified explanation for game-based learning, game performance, and related gameplay outcomes while also providing a theory-based direction for advancing the study of games more broadly. The propositions explicated in this article are intended to serve as the primary tenets of model matching theory. Considerations for how these propositions may be tested in future games studies research are discussed.
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Chao, Zhong, Wang Likun, Qin Lei, Sun Shaoping et Li Xing. « The theoretical model of 1–3 piezocomposite transducer with matching layer ». Ferroelectrics 554, no 1 (2 janvier 2020) : 97–103. http://dx.doi.org/10.1080/00150193.2020.1717273.
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Lisi, Gaetano, et Mauro Iacobini. « Estimating the housing price with a search-and-matching model ». Journal of European Real Estate Research 8, no 2 (3 août 2015) : 196–216. http://dx.doi.org/10.1108/jerer-09-2014-0035.
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Purpose – This paper aims to pose an important starting point for the application of the search-and-matching models to real estate appraisals, thus reducing the “gap” between practitioners and academicians. Due to relevant trading frictions, the search-and-matching framework has become the benchmark theoretical model of the housing market. Starting from the large related literature, this paper develops a simplified approach to modelling the frictions that focuses on the direct relationship between house price and market tightness (a common feature only for the labour market matching models). The characterization of the equilibrium through two main variables simplifies the analysis and allows using the theoretical model for empirical purposes, namely, the real estate appraisals. Design/methodology/approach – This work is both theoretical and empirical. Theoretically, a long-run equilibrium model with a positive share of vacant houses and home seekers is determined along with price and market tightness. Also, the conditions of existence and uniqueness of the steady-state equilibrium are determined. Unlike most of the search-and-matching models in the housing literature, the out-of-the steady-state dynamics are also analyzed to show the stability of the equilibrium. Empirically, to show the usefulness of the theoretical model, a numerical simulation is performed. By using two readily available housing market data – the expected time on the market and the average number of trades – it is possible to determine the key variables of the model: price, market tightness and matching opportunities for both buyers and sellers. Although the numerical simulation concerns the Italian housing market, the proposed model is generally valid, being empirically applicable to all real estate markets characterized by non-negligible trading frictions. Indeed, the proposed model can be used to compare housing markets with different features (concerning the search and matching process), as well as analyse the same housing market in different time periods (because the efficiency of the search and matching process can change). Findings – Several important results are obtained. First, the price adjustment – i.e. the difference between the actual selling price and the price obtained in an ideal situation of frictionless housing market – is remarkable. This means that the sign and the size of the price adjustment depend on the extent of trading frictions in the housing market. Precisely, the higher the trading frictions on the demand side (more buyers and less sellers), the higher the actual selling price (the price adjustment is positive), whereas the higher the trading frictions on the supply side (less buyers and more sellers), the lower the actual selling price (the price adjustment is negative). Accordingly, the real estate appraisers should assess the trading frictions in the housing market before determining the price adjustment. Second, an increase in the number of trades affects the house price only if the time on the market varies. Also, the higher the variation in the time on the market, the larger the house price adjustment. Indeed, the expected time on the market reflects the opportunities to matching for both parties and thus the trading frictions. If the time on the market increases (decreases), the seller will receive less (more) opportunities to match; thus, the actual selling price will be driven downwards (upwards). Originality/value – As far as the authors are aware, none of the existing works in the search and matching literature has considered how to take advantage of this theoretical approach to estimate the house price in the presence of trading frictions in the housing market. Indeed, the proposed theoretical model may be a useful tool for real estate appraisers, as it is able to derive the trading frictions from the time on the market and the number of trades, thus estimating properly the house price.
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Lisi, Gaetano. « The Mortensen-Pissarides model and the empirical facts of housing markets ». Journal of European Real Estate Research 14, no 2 (7 mai 2021) : 259–71. http://dx.doi.org/10.1108/jerer-07-2020-0044.
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Purpose This paper aims to explain the main empirical facts of housing markets, notably the trade-off between housing price and time-on-the-market, the positive correlation between housing price and the number of contracts traded during a given period (i.e. the trading volume) and the existence of price dispersion. Design/methodology/approach This theoretical paper makes use of a search and matching model. Search and matching, indeed, are two fundamental characteristics of the trading process in the housing market, and, thus, the search-and-matching models have become the new economic approach to the analysis of real estate markets. Findings This paper shows that a slightly modified version of the baseline search and matching model à la Mortensen-Pissarides can explain the main empirical facts of housing markets. There are two key mechanisms that allow to achieve this notable goal: a simple formalisation of the (reasonable) assumption that buyers today are potential sellers tomorrow (and vice versa); and the direct relationship between market tightness and house price, derived by the standard matching model and underestimated by the related literature. Research limitations/implications The developed theoretical model only studies the equilibrium conditions. Indeed, it would be interesting to also study the disequilibrium in housing markets. Practical implications The explanation of the main empirical facts of housing markets is embodied in the same and relatively simple theoretical model. Originality/value In addition to the explanation of the main empirical facts of housing markets, the developed theoretical model can generate an upward sloping Beveridge curve in the housing market (the positive relation between home-seekers and vacant houses). Instead, according to a recent criticism in the related literature, a model à la Mortensen-Pissarides inherently generates a (empirically unrealistic) downward sloping Beveridge curve.
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Zhang, Liu Yang, Yu Jiang Liu et Jin Zhe Huang. « The Optical Design of Achromatic Phase Matching System Based on ZEMAX ». Advanced Materials Research 981 (juillet 2014) : 774–77. http://dx.doi.org/10.4028/www.scientific.net/amr.981.774.
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The system of achromatic phase matching (APM) based on grating pairs is designed by the commercial optical design software ZEMAX. Firstly, we theoretically calculate the theoretical incident angular where each frequency components exactly reaches the phase-matching in nonlinear crystals. Subsequently, the model of APM system is built and optimized in ZEMAX. The results are well in accordance with the theoretical ones. In addition, the effects of grating frequency and aberration produced by the focus lens on APM scheme are analyzed.
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Garcia Iglesias, Daniel. « Propensity Score Matching Underestimates Real Treatment Effect, in a Simulated Theoretical Multivariate Model ». Mathematics 10, no 9 (5 mai 2022) : 1547. http://dx.doi.org/10.3390/math10091547.
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Propensity Score Matching (PSM) is a useful method to reduce the impact of Treatment-Selection Bias in the estimation of causal effects in observational studies. After matching, the PSM significantly reduces the sample under investigation, which may lead to other possible biases (due to overfitting, excess of covariation or a reduced number of observations). In this sense, we wanted to analyze the behavior of this PSM compared with other widely used methods to deal with non-comparable groups, such as the Multivariate Regression Model (MRM). Monte Carlo Simulations are made to construct groups with different effects in order to compare the behavior of PSM and MRM estimating these effects. In addition, the Treatment Selection Bias reduction for the PSM is calculated. With the PSM a reduction in the Treatment Selection Bias is achieved (0.983 [0.982, 0.984]), with a reduction in the Relative Real Treatment Effect Estimation Error (0.216 [0.2, 0.232]), but despite this bias reduction and estimation error reduction, the MRM reduces this estimation error significantly more than the PSM (0.539 [0.522, 0.556], p < 0.001). In addition, the PSM leads to a 30% reduction in the sample. This loss of information derived from the matching process may lead to another not known bias and thus to the inaccuracy of the effect estimation compared with the MRM.
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Fregly, Benjamin J., Haseeb A. Rahman et Scott A. Banks. « Theoretical Accuracy of Model-Based Shape Matching for Measuring Natural Knee Kinematics with Single-Plane Fluoroscopy ». Journal of Biomechanical Engineering 127, no 4 (27 janvier 2005) : 692–99. http://dx.doi.org/10.1115/1.1933949.
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Quantification of knee motion under dynamic, in vivo loaded conditions is necessary to understand how knee kinematics influence joint injury, disease, and rehabilitation. Though recent studies have measured three-dimensional knee kinematics by matching geometric bone models to single-plane fluoroscopic images, factors limiting the accuracy of this approach have not been thoroughly investigated. This study used a three-step computational approach to evaluate theoretical accuracy limitations due to the shape matching process alone. First, cortical bone models of the femur, tibia/fibula, and patella were created from CT data. Next, synthetic (i.e., computer generated) fluoroscopic images were created by ray tracing the bone models in known poses. Finally, an automated matching algorithm utilizing edge detection methods was developed to align flat-shaded bone models to the synthetic images. Accuracy of the recovered pose parameters was assessed in terms of measurement bias and precision. Under these ideal conditions where other sources of error were eliminated, tibiofemoral poses were within 2mm for sagittal plane translations and 1.5deg for all rotations while patellofemoral poses were within 2mm and 3deg. However, statistically significant bias was found in most relative pose parameters. Bias disappeared and precision improved by a factor of two when the synthetic images were regenerated using flat shading (i.e., sharp bone edges) instead of ray tracing (i.e., attenuated bone edges). Analysis of absolute pose parameter errors revealed that the automated matching algorithm systematically pushed the flat-shaded bone models too far into the image plane to match the attenuated edges of the synthetic ray-traced images. These results suggest that biased edge detection is the primary factor limiting the theoretical accuracy of this single-plane shape matching procedure.
Thèses sur le sujet "Theoretical matching model"
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Dong, Yingying. « Microeconometric Models with Endogeneity -- Theoretical and Empirical Studies ». Thesis, Boston College, 2009. http://hdl.handle.net/2345/753.
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Thesis advisor: Arthur LewbelThis dissertation consists of three independent essays in applied microeconomics and econometrics. Essay 1 investigates the issue why individuals with health insurance use more health care. One obvious reason is that health care is cheaper for the insured. But additionally, having insurance can encourage unhealthy behavior via moral hazard. The effect of health insurance on medical utilization has been extensively studied; however, previous work has mostly ignored the effect of insurance on behavior and how that in turn affects medical utilization. This essay examines these distinct effects. The increased medical utilization due to reduced prices may help the insured maintain good health, while that due to increased unhealthy behavior does not, so distinguishing these two effects has important policy implications. A two-period dynamic forward-looking model is constructed to derive the structural causal relationships among the decision to buy insurance, health behaviors (drinking, smoking, and exercise), and medical utilization. The model shows how exogenous changes in insurance prices and past behaviors can identify the direct and indirect effects of insurance on medical utilization. An empirical analysis also distinguishes between intensive and extensive margins (e.g., changes in the number of drinkers vs. the amount of alcohol consumed) of the insurance effect, which turns out to be empirically important. Health insurance is found to encourage less healthy behavior, particularly heavy drinking, but this does not yield a short term perceptible increase in doctor or hospital visits. The effects of health insurance are primarily found at the intensive margin, e.g., health insurance may not cause a non-drinker to take up drinking, while it encourages a heavy drinker to drink even more. These results suggest that to counteract behavioral moral hazard, health insurance should be coupled with incentives that target individuals who currently engage in unhealthy behaviors, such as heavy drinkers. Essay 2 examines the effect of repeating kindergarten on the retained children's academic performance. Although most existing research concludes that grade retention generates no benefits for retainees' later academic performance, holding low achieving children back has been a popular practice for decades. Drawing on a recently collected nationally representative data set in the US, this paper estimates the causal effect of kindergarten retention on the retained children's later academic performance. Since children are observed being held back only when they enroll in schools that permit retention, this paper jointly models 1) the decision of entering a school allowing for kindergarten retention, 2) the decision of undergoing a retention treatment in kindergarten, and 3) children's academic performance in higher grades. The retention treatment is modeled as a binary choice with sample selection. The outcome equations are linear regressions including the kindergarten retention dummy as an endogenous regressor with a correlated random coefficient. A control function estimator is developed for estimating the resulting double-hurdle treatment model, which allows for unobserved heterogeneity in the retention effect. As a comparison, a nonparametric bias-corrected nearest neighbor matching estimator is also implemented. Holding children back in kindergarten is found to have positive but diminishing effects on their academic performance up to the third grade. Essay 3 proves the semiparametric identification of a binary choice model having an endogenous regressor without relying on outside instruments. A simple estimator and a test for endogeneity are provided based on this identification. These results are applied to analyze working age male's migration within the US, where labor income is potentially endogenous. Identification relies on the fact that the migration probability among workers is close to linear in age while labor income is nonlinear in age(when both are nonparametrically estimated). Using data from the PSID, this study finds that labor income is endogenous and that ignoring this endogeneity leads to downward bias in the estimated effect of labor income on the migration probability
Thesis (PhD) — Boston College, 2009
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Economics
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Addesa, Francesco Agostino Domenico. « Beveridge curve, job matching and labour market dynamics : a multi-level empirical analysis ». Doctoral thesis, Universita degli studi di Salerno, 2010. http://hdl.handle.net/10556/241.
Texte intégralRésumé :
2007 - 2008The aim of this thesis is to contribute to the debate on the Beveridge Curve: more specifically, after providing a theoretical introduction to the Curve in Chapter I, we focus on some empirical points, concerning globalisation and technological progress, which the international empirical literature has not dealt with closely (Chapter II), and on a level analysis which no previous study has dealt with in the Italian literature (Chapter III). Chapter I centres on the matching approach founding the studies on the Beveridge Curve since the late 1970's, it also mentions the recent production frontier approach and gives a look to the possible consequences of the Great Recession on the matching process and the Curve. The aim of Chapter II is to test the existence of a Beveridge Curve analysing the economies of nineteen OECD countries from 1980 to 2004, and to investigate whether and how technological progress and globalisation affect the unemployment-vacancies trade-off. Indeed, in the literature concerning the Beveridge Curve, only a few contributions (Pissarides, 1990; Aghion and Howitt, 1994) have examined the role of technological progress as a significant shift factor for labour market performance. However, there is no unanimity about the sign of its impact. Furthermore, few economists would deny that globalisation, that is the growing international interdependence in communications, trade, finance, labour markets (migration), social systems, is one of fundamental socio-economic phenomena of this turn of century. Consequently, globalisation is another factor which is expected to impact on the Beveridge Curve, but no full-fledged estimation has, to the best of our knowledge, ever been carried out of this nexus. We can sum up the main results as follows: a) we find largely favourable evidence for the existence of a OECD Beveridge Curve; b) lagged values of technological progress impact positively on unemployment and shift the Beveridge Curve outwards, producing evidence in support of the creative destruction effect; c) lagged values of the globalisation index have a positive impact on unemployment, also shifting the Beveridge Curve outwards; d) a critical econometric issue, extremely neglected by the previous literature, is represented by endogeneity, as shown by tests and other kind of evidence. Finally, Chapter III focuses on the Italian labour market. There are not many studies that have analyzed the Beveridge Curve in Italy, likely because of the lack of official data on vacancies. Moreover, no previous study has focused specifically on a regional level analysis of the Beveridge Curve. Chapter III aims at filling this gap of the literature using quarterly data for the 1992-2009 period. In particular, the ISAE labour scarcity indicator, which is available for all the regions, is used to build regional vacancy rates. Like in Destefanis and Fonseca (2007), we also investigate the impact on matching efficiency of the recent strong development in the number of so-called atypical jobs (both part-time and temporary)… [edited by author].
VII n.s.
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QUINTILII, ELIANA. « The Role of Information into Matching Markets - Form Theoretical Models to the Practical Application on the Hiring Procedure for Assistant Professors in Italy ». Doctoral thesis, Università degli studi di Pavia, 2017. http://hdl.handle.net/11571/1203272.
Texte intégralRésumé :
The thesis is made up by three independent papers, logically linked by their validity for the analysis and redesigning proposal of the hiring procedure for Assistant Professors in Italy. All of them refer to the literature on matching theories and market design. The papers focus on the role played by information into the setting analyzed and their results are generalizable to similar job markets. The dissertation illustrates a complete work of market design, presented from the analysis of the current procedure to the proposal of a new structure. The research work started from formally demonstrating if the real-world market is failing, and, in the affirmative case, what is causing its failure. Then, the first paper introduces a decentralized matching model that proceeds by rounds, that formalizes this hiring procedure. The model shows what kind of assumptions and constraints are necessary for achieving stable results in this particular matching mechanism. On the reverse, it highlights which are the structure features that create unstable outcomes and allows the market designer to formally identify the causes of inefficiencies. The model is formalized in a setting of complete information, such that it makes clearer and easier its analysis and explanation. However, due to the unreality of this setting, I stressed the model into more realistic context where information is not always available. The second paper starts by removing only part of the information (the preferences’ profiles of the other agents), and ends into an “uncertainty” scenario. I recalled the model of symmetric information (Roth and Rothblum 1999) and I demonstrated that the mechanism implements a Bayesian Nash Equilibrium strategy profile characterized by multiple stable equilibria. Then, I stressed the model by removing almost all the information, such that they do not know how many institutions will offer a job positions, which of them will open the vacancy and when. I also assumed that agents do not have lists of preferences but they follow their utility function. I set the assumption that any candidate beliefs that the round she is playing will be the last. I demonstrated that up to the real preference profile, for a shared common belief on the others’ preference list, and for a shared common belief over the state of the world, a truthfully revealing strategy profile is a Bayesian Nash Equilibrium.
Given the difficulty of managing a decentralized mechanism, I formalize the hiring procedure as a centralized market. I outline the advantages obtained by this redesigning policy, but I also show that there is still an aspect not addressed: the “meritocracy problem”. By the expression “meritocracy problem”, I refer to any contest whose winner is not actually better than all the others. The aim of the third paper is to transfer the meritocracy problem into the matching model. I recognize the so called “meritocracy problem” as a problem related to the decision rules and equivalent to an agency problem between the Institution and the committee. The focus is on the realization of the preference list. The meritocracy problem is given by a misalignment of interest – and preferences – between these two agents. It happens that the preferences’ lists submitted by the committees not always reflects the real preferences of the Institutions, i.e. commissioners misreport Institutions’ preferences. The results obtained after running the DA are stable up to the submitted preferences, but unstable up to what Institutions really desire. This instability is enough for stating the agency problem as a potential threat to the well-functioning of a matching market where at least one group of agents follow a semi-regulated decision process. I propose a solution focused on the control of commissioners’ actions.The thesis is made up by three independent papers, logically linked by their validity for the analysis and redesigning proposal of the hiring procedure for Assistant Professors in Italy. All of them refer to the literature on matching theories and market design. The papers focus on the role played by information into the setting analyzed and their results are generalizable to similar job markets. The dissertation illustrates a complete work of market design, presented from the analysis of the current procedure to the proposal of a new structure. The research work started from formally demonstrating if the real-world market is failing, and, in the affirmative case, what is causing its failure. Then, the first paper introduces a decentralized matching model that proceeds by rounds, that formalizes this hiring procedure. The model shows what kind of assumptions and constraints are necessary for achieving stable results in this particular matching mechanism. On the reverse, it highlights which are the structure features that create unstable outcomes and allows the market designer to formally identify the causes of inefficiencies. The model is formalized in a setting of complete information, such that it makes clearer and easier its analysis and explanation. However, due to the unreality of this setting, I stressed the model into more realistic context where information is not always available. The second paper starts by removing only part of the information (the preferences’ profiles of the other agents), and ends into an “uncertainty” scenario. I recalled the model of symmetric information (Roth and Rothblum 1999) and I demonstrated that the mechanism implements a Bayesian Nash Equilibrium strategy profile characterized by multiple stable equilibria. Then, I stressed the model by removing almost all the information, such that they do not know how many institutions will offer a job positions, which of them will open the vacancy and when. I also assumed that agents do not have lists of preferences but they follow their utility function. I set the assumption that any candidate beliefs that the round she is playing will be the last. I demonstrated that up to the real preference profile, for a shared common belief on the others’ preference list, and for a shared common belief over the state of the world, a truthfully revealing strategy profile is a Bayesian Nash Equilibrium. Given the difficulty of managing a decentralized mechanism, I formalize the hiring procedure as a centralized market. I outline the advantages obtained by this redesigning policy, but I also show that there is still an aspect not addressed: the “meritocracy problem”. By the expression “meritocracy problem”, I refer to any contest whose winner is not actually better than all the others. The aim of the third paper is to transfer the meritocracy problem into the matching model. I recognize the so called “meritocracy problem” as a problem related to the decision rules and equivalent to an agency problem between the Institution and the committee. The focus is on the realization of the preference list. The meritocracy problem is given by a misalignment of interest – and preferences – between these two agents. It happens that the preferences’ lists submitted by the committees not always reflects the real preferences of the Institutions, i.e. commissioners misreport Institutions’ preferences. The results obtained after running the DA are stable up to the submitted preferences, but unstable up to what Institutions really desire. This instability is enough for stating the agency problem as a potential threat to the well-functioning of a matching market where at least one group of agents follow a semi-regulated decision process. I propose a solution focused on the control of commissioners’ actions.
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Krishnamurthy, Vivek. « Theoretical investigation of photonic crystal and metal cladding for waveguides and ». Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28214.
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Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.Committee Chair: Klein, Benjamin; Committee Member: Alavi, Kambiz; Committee Member: Allen, Janet K.; Committee Member: Buck, John; Committee Member: Gaylord, Tom; Committee Member: Yoder, Douglas.
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Liu, Yang. « Structural Econometric Models of Unemployment, Immigration, and Job-Worker Matching in Urban China : from the Supply and Demand Approach to the Search-Theoretic Approach ». Kyoto University, 2012. http://hdl.handle.net/2433/157501.
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Latry, Olivier. « Théorie des modes locaux dans les guides perturbés application : couplage fibre optique - photodiode PIN ». Rouen, 1995. http://www.theses.fr/1995ROUE5001.
Texte intégralRésumé :
La réduction des dimensions des composants optoélectroniques constitue une contrainte importante pour un couplage optimal avec la fibre optique. Le but recherché étant de focaliser le maximum de lumière à l'intérieur de la couche intrinsèque de la photodiode, il faudrait donc envisager de réduire le diamètre de la fibre optique. Une étude du bout de la fibre est également menée et montre que pour une forme lentillée appropriée, il est possible d'adapter la distribution d'énergie entre fibre optique et photodiode. Le calcul du champ le long de ce guide de dimensions lentement décroissantes utilise la méthode des modes locaux. Cette méthode est employée car il n'y a pas de solutions exactes aux équations de Maxwell. En réalité, le champ total est la superposition des champs locaux et du champ radiatif. Les pertes d'énergie le long de ce guide sont analysées avec la théorie du couplage des modes locaux. On obtient alors un bilan le long de ce guide que l'on cherche à optimiser. La comparaison de ces résultats avec la simulation numérique quasi 3 D de la propagation optique guidée sur ALCOR est également réalisée. Ceci permet de définir la structure la mieux adaptée pour un couplage optimum entre la fibre et le composant
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Yusri, Rita. « A game theoretical model for a collaborative e-learning platform on privacy awareness ». Thesis, 2020. http://hdl.handle.net/1866/24338.
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De nos jours, avec l'utilisation croissante des technologies numériques, l'éducation à la préservation de la vie privée joue un rôle important en particulier pour les adolescents. Bien que plusieurs plateformes d'apprentissage en ligne à la sensibilisation à la vie privée aient été mises en œuvre, elles sont généralement basées sur des techniques traditionnelles d'apprentissage. Plus particulièrement, ces plateformes ne permettent pas aux étudiants de coopérer et de partager leurs connaissances afin d’améliorer leur apprentissage ensemble. En d'autres termes, elles manquent d'interactions élève-élève.
Des recherches récentes sur les méthodes d'apprentissage montrent que la collaboration entre élèves peut entraîner de meilleurs résultats d'apprentissage par rapport à d'autres approches. De plus, le domaine de la vie privée étant fortement lié à la vie sociale des adolescents, il est préférable de fournir un environnement d'apprentissage collaboratif où l’on peut enseigner la préservation de la vie privée, et en même temps, permettre aux étudiants de partager leurs connaissances. Il serait souhaitable que ces derniers puissent interagir les uns avec les autres, résoudre des questionnaires en collaboration et discuter de problèmes et de situations de confidentialité.
À cet effet, ce travail propose « Teens-online », une plateforme d'apprentissage en ligne collaborative pour la sensibilisation à la vie privée. Le programme d'études fourni dans cette plateforme est basé sur le Référentiel de formation des élèves à la protection des données personnelles. De plus, la plateforme proposée est équipée d'un mécanisme d'appariement de partenaires basé sur la théorie des jeux. Ce mécanisme garantit un appariement élève-élève stable en fonction des besoins de l'élève (comportement et / ou connaissances). Ainsi, des avantages mutuels seront obtenus en minimisant les chances de coopérer avec des pairs incompatibles.
Les résultats expérimentaux montrent que l'utilité moyenne obtenue en appliquant l'algorithme proposé est beaucoup plus élevée que celle obtenue en utilisant d'autres mécanismes d'appariement. Les résultats suggèrent qu'en adoptant l'approche proposée, chaque élève peut être jumelé avec des partenaires optimaux, qui obtiennent également en retour des résultats d'apprentissage plus élevés.Nowadays, with the increasing use of digital technologies, especially for teenagers, privacy education plays an important role in their lives. While several e-learning platforms for privacy awareness training have been implemented, they are typically based on traditional learning techniques. In particular, these platforms do not allow students to cooperate and share knowledge with each other in order to achieve mutual benefits and improve learning outcomes. In other words, they lack student-student interaction. Recent research on learning methods shows that the collaboration among students can result in better learning outcomes compared to other learning approaches. Motivated by the above-mentioned facts, and since privacy domain is strongly linked to the social lives of teens, there is a pressing need for providing a collaborative learning platform for teaching privacy, and at the same time, allows students to share knowledge, interact with each other, solve quizzes collaboratively, and discuss privacy issues and situations. For this purpose, this work proposes “Teens-online”, a collaborative e-learning platform for privacy awareness. The curriculum provided in this platform is based on the Personal Data Protection Competency Framework for School Students. Moreover, the proposed platform is equipped with a partner-matching mechanism based on matching game theory. This mechanism guarantees a stable student-student matching according to a student's need (behavior and/or knowledge). Thus, mutual benefits will be attained by minimizing the chances of cooperating with incompatible students. Experimental results show that the average learning-related utility obtained by applying the proposed partner-matching algorithm is much higher than the average utility obtained using other matching mechanisms. The results also suggest that by adopting the proposed approach, each student can be paired with their optimal partners, which in turn helps them reach their highest learning outcomes.
Livres sur le sujet "Theoretical matching model"
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Roth, Alvin E. Two-sided matching : A study in game-theoretic modeling and analysis. Cambridge [England] : Cambridge University Press, 1990.
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Mammalian cardiovascular system simulation : A catastrophe theoretic approach with the matching simulation method. Winnipeg : Wuerz Publishing, 1993.
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Two-Sided Matching : A Study in Game-Theoretic Modeling and Analysis. Cambridge : Cambridge University Press, 2003.
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Roth, Alvin E. Two-Sided Matching : A Study in Game-Theoretic Modeling and Analysis. Cambridge University Press, 2013.
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Roth, Alvin E. Two-Sided Matching : A Study in Game-Theoretic Modeling and Analysis. Cambridge University Press, 1992.
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Rees, Carter, et L. Thomas Winfree. Social Learner Decision Making. Sous la direction de Wim Bernasco, Jean-Louis van Gelder et Henk Elffers. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199338801.013.13.
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Social learning theory is one of the leading theories in the field of criminology. This chapter provides an overview of the role of choice and human agency within the theoretical framework of social learning and their integrative importance for understanding delinquency and crime. Emphasis is placed on research stemming from Herrnstein’s matching law, choice allocation, and statistical models of social learning as applied to social networks. The chapter provides a unifying discussion of choice-based theories of behavior, elaborates on existing statistical models used to test these choice-based and social learning theories, and suggests topics for an innovative research agenda grounded in the relevant literature. In addition, the chapter articulates a research agenda that will help researchers further promote empirical and theoretical advancements in the social learning tradition of criminology.
Chapitres de livres sur le sujet "Theoretical matching model"
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Markutsya, Sergiy, Yana A. Kholod, Ajitha Devarajan, Theresa L. Windus, Mark S. Gordon et Monica H. Lamm. « A coarse-grained model for β-D-glucose based on force matching ». Dans Highlights in Theoretical Chemistry, 161–75. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34450-3_14.
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Ahmed, Pritom, A. S. M. Shohidull Islam et M. Sohel Rahman. « A Graph Theoretic Model to Solve the Approximate String Matching Problem Allowing for Translocations ». Dans Lecture Notes in Computer Science, 169–81. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-35926-2_20.
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Chiappori, Pierre-André. « Conclusion ». Dans Matching with Transfers. Princeton University Press, 2017. http://dx.doi.org/10.23943/princeton/9780691171739.003.0008.
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This concluding chapter discusses the progress that has been made with matching models on both the theoretical and the empirical front. Regarding theory, the power and the limits of the transferable utility (TU) model are now better understood. The TU framework can (admittedly under specific assumptions on preferences) encompass most aspects of family economics, including fertility, domestic production, risk sharing, and the consumption of public commodities. On the empirical side, the econometrics of matching models have seen several major advances, with the Choo-Siow model as a prime example. The chapter also considers what matching models teach us about reality, such as the asymmetry between male and female demand for higher education, and the relationship between assortative matching and inequality. Furthermore, a host of social issues can only be analyzed from a general equilibrium perspective; this is evident in the case of Roe v. Wade.
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Uchida, Seiichi. « Elastic Matching Techniques for Handwritten Character Recognition ». Dans Pattern Recognition Technologies and Applications, 17–38. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-807-9.ch002.
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This chapter reviews various elastic matching techniques for handwritten character recognition. Elastic matching is formulated as an optimization problem of planar matching, or pixel-to-pixel correspondence, between two character images under a certain matching model, such as affine and nonlinear. Use of elastic matching instead of rigid matching improves the robustness of recognition systems against geometric deformations in handwritten character images. In addition, the optimized matching represents the deformation of handwritten characters and thus is useful for statistical analysis of the deformation. This chapter argues the general property of elastic matching techniques and their classification by matching models and optimization strategies. It also argues various topics and future work related to elastic matching for emphasizing theoretical and practical importance of elastic matching.
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Caladine, Richard. « The Learning Technologies Model ». Dans Enhancing E-Learning with Media-Rich Content and Interactions, 101–33. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-732-4.ch007.
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The learning activities model (LAM) developed in the previous chapter provides a theoretical framework for the analysis of the process of learning through the categorization of activities. During the design of learning events, different techniques, methods, and technologies can be applied to activities within each category or to complete categories of the LAM. This matching process is, in essence, the basis of the technology selection method (TSM), presented in Chapter VIII. However, before technologies that are appropriate to learners and learning events can be selected it is essential to have a clear understanding of the nature and capabilities of the technologies. To assist in the understanding and analysis of learning technologies, a theoretical framework of them, called the learning technologies model (LTM), is presented.
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Kukkonen, Karin. « The Curse of Realism ». Dans 4E Cognition and Eighteenth-Century Fiction, 8–24. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190913045.003.0002.
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This chapter challenges the assumption that throughout history the novel gets progressively better at realism and at matching its language in cognitive processes. It characterises this assumption as “the curse of realism,” which retroactively imposes standards from the nineteenth-century novel onto texts from earlier periods and evaluates them as lacking stylistic and narrative achievements that they never aimed for. A counter-model, based on embodied cognition and predictive, probabilistic cognition, is proposed. This allows cognitive approaches to literature to move away from a teleological perspective (where the novel improves its match with cognition) and towards a dialectic perspective (where literary texts can relate to cognition in ways that are not inherently more accurate than others). This chapter lays the overall theoretical foundations for the case studies in the following chapters.
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Dang, Tran Khanh. « Ensuring Correctness, Completeness, and Freshness for Outsourced Tree-Indexed Data ». Dans IT Outsourcing, 2130–47. IGI Global, 2010. http://dx.doi.org/10.4018/978-1-60566-770-6.ch135.
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In an outsourced database service model, query assurance takes an important role among wellknown security issues. To the best of our knowledge, however, none of the existing research work has dealt with ensuring the query assurance for outsourced tree-indexed data. To address this issue, the system must prove authenticity and data integrity, completeness, and freshness guarantees for the result set. These objectives imply that data in the result set is originated from the actual data owner and has not been tampered with; the server did not omit any tuples matching the query conditions; and the result set was generated with respect to the most recent snapshot of the database. In this paper, we propose a vanguard solution to provide query assurance for outsourced tree-indexed data on untrusted servers with high query assurance and at reasonable costs. Experimental results with real datasets con?rm the effciency of our approach and theoretical analyses.
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Dang, Tran Khanh. « Ensuring Correctness, Completeness, and Freshness for Outsourced Tree-Indexed Data ». Dans Database Technologies, 2204–22. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-058-5.ch134.
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In an outsourced database service model, query assurance takes an important role among wellknown security issues. To the best of our knowledge, however, none of the existing research work has dealt with ensuring the query assurance for outsourced tree-indexed data. To address this issue, the system must prove authenticity and data integrity, completeness, and freshness guarantees for the result set. These objectives imply that data in the result set is originated from the actual data owner and has not been tampered with; the server did not omit any tuples matching the query conditions; and the result set was generated with respect to the most recent snapshot of the database. In this paper, we propose a vanguard solution to provide query assurance for outsourced tree-indexed data on untrusted servers with high query assurance and at reasonable costs. Experimental results with real datasets con?rm the effciency of our approach and theoretical analyses.
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Kumar, Naresh, et Vittore Casarosa. « Expressing Needs of Digital Audio-Visual Applications in Different Communities of Practice for Long-Term Preservation ». Dans Advances in Library and Information Science, 54–78. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1653-8.ch004.
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Lack of awareness on preservation tools and applications is a big issue today. To solve it European Commission has initiated research project, Presto4U that aimed to enable semi-automatic matching of preservation tools with audio-visual needs. To express the audio-visual needs formally it has mapped a knowledge schema. The knowledge schema was first cut and needed evaluation in terms of its ability to represent the Needs of different communities of practice, classes, their association and ability to represent requirements of Audio-visual community through properties of its classes. This evaluative study is conducted through Qualitative research approach using Interview and Questionnaire. Open Archival Information System reference model is used as theoretical framework. Fourteen members from Europe of three communities of practice have provided their needs for analysis. Data was analysed through six stages. The study found that knowledge schema is useful to express the needs of communities of practice but collected data should easily fit into the structure of knowledge schema.
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Ukwueze, Ezebuilo R., Henry T. Asogwa, Onyinye M. David-Wayas, Chisom Emecheta et Johnson E. Nchege. « How Does Microfinance Empower Women in Nigeria ? » Dans Advances in Finance, Accounting, and Economics, 1–22. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5240-6.ch001.
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That microfinance institutions empower women has become a heated debate at both theoretical and empirical economics. A large proportion of women in developing countries are characterized by segregation, relegation, poverty, vulnerability; majority of them engaged in agriculture and related economic activities, while a few others have menial jobs. The objective of this chapter is to determine how microfinance has empowered women in Nigeria. It employed propensity score matching and logit model to estimate the effect of microfinance on women empowerment and welfare. The results show that age of women, education, belonging to saving association, and operating an account are the determinants of women empowerment and welfare as they access finance from the microfinance banks. It was also observed that there is disparity among women who have access to liquidity. It is recommended that more microfinance banks be cited in the rural sector where the majority of the poor reside, policies like low interest rates, national awareness, and incentives for more women to access micro-credits.
Actes de conférences sur le sujet "Theoretical matching model"
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Bryant, Carol E., et James L. Rutledge. « Theoretical Considerations for Scaling Convection in Overall Effectiveness Experiments ». Dans ASME Turbo Expo 2022 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-81508.
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Abstract An increasingly common experimental technique allows measurement of overall effectiveness by matching the Biot number between experimental and engine conditions. The measured overall effectiveness distribution correlates to the expected turbine component temperature distribution. While a good deal of work has been devoted to determining the appropriate flow conditions necessary to scale adiabatic effectiveness, very little attention has been paid to the subtleties beyond matching the Biot number that arise when performing experiments on a conducting model to determine overall effectiveness. Notably, the ratio of the internal and external heat transfer coefficient must be matched. The density ratio and more recently, the specific heat ratio, have been shown to play important roles in scaling adiabatic effectiveness; however, in the present work, we demonstrate the requirements for the coolant and freestream flow conditions required to conduct an appropriately scaled overall effectiveness experiment. Since the viscosity and thermal conductivity of the fluids (in addition to density and specific heat) play significant roles that influence heat transfer coefficient behavior, this gives rise to an additional nondimensional parameter that should, in theory, be matched to properly execute an overall effectiveness experiment. In this paper, we demonstrate that this new nondimensional parameter will be matched provided that Pr∞, Prc, and Rec are matched in addition to the freestream Reynolds number and the advective capacity ratio. We demonstrate the validity of this requirement through computational fluid dynamics simulations, which are well-suited for this since the over-constrained requirements can be overcome by altering gas properties from the real values. Simulations of an internally cooled wall exposed to a hot freestream were performed with various gases to show the sensitivity of the overall effectiveness to these previously ignored requirements. An additional set of simulations on a film cooled plate reveals additional complexities when coolant mixes with the freestream gas.
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Shah, Parthiv N., Tricia Waniewski Sur, R. Scott Miskovish et Albert Robinson. « Theoretical and Computational Analysis of an Auxiliary Power Unit (APU) Installation Cooling System ». Dans ASME Turbo Expo 2012 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68643.
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This paper presents a theoretical one-dimensional model and computational fluid dynamics (CFD) simulations of a tailcone-installed APU cooling system. The work is motivated by the need to deliver sufficient cooling airflow to critical components within an aircraft tailcone compartment. The cooling system considered herein utilizes (1) an eductor system at the APU exhaust and (2) a ram air scoop near an upstream inlet to the compartment to induce the necessary cooling flow during ground and in-flight APU operation. A one-dimensional flow network model provides a framework for the quantification and matching of eductor pumping and system pressure drop characteristics. Detailed CFD models that simulate internal tailcone compartment flows driven by ambient conditions external to the aircraft in ground or flight operation support the one-dimensional model and are used to characterize component performance and assess different scoop and eductor designs. The one-dimensional flow network model is calibrated to the CFD results to predict system cooling performance under known APU loads at points on the ground and in the flight envelope. The agreement between the models is encouraging and suggests the modeling framework and CFD techniques discussed will be applicable to future designs and improvements of eductor-driven aircraft compartment cooling systems.
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Hajiarab, Mohammad, J. Michael R. Graham et Martin Downie. « Prediction of Roll Damping in the Frequency Domain Using the Discrete Vortex Method ». Dans ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-21000.
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This paper describes a theoretical approach to predict roll damping for a three-dimensional barge shaped vessel in the frequency domain by matching a simple discrete vortex method (DVM), describing local separated flow, to an inviscid 3-D seakeeping code. The results are compared with model test experiments to demonstrate validity of the method. A good agreement between the model test RAO and the damped RAO is achieved.
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Olympio, Raul B., John Donahue et Adam M. Wickenheiser. « Theoretical and Experimental Analysis of Frequency Up-Conversion Energy Harvesters Under Human-Generated Vibrations ». Dans ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7674.
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Piezoelectric energy harvesters are devices capable of converting the kinetic energy present in vibration-based motion into electrical energy using piezoelectric transducers. This kind of device has its maximum efficiency when the exciting frequency matches its natural frequency. In the past years, some authors have explored the use of human motion as a vibration source, and harvesting energy in this situation is not trivial because the low-frequency characteristics of the motion are not compatible with small, light-weight transducers, which have relatively high natural frequencies. To overcome this problem, a method known as frequency up-conversion is used; it consists of a nonlinear vibration-based, magnetically excited harvester that exhibits frequency-independent performance, allowing the device to be efficient in a wide band of frequencies. In this work, the power output of a piezoelectric energy harvesting with frequency up-conversion submitted to walking and running vibrations is analyzed. Data are collected using an accelerometer located on the front pocket of each subject and then used in simulations. The model used consists of a cantilever beam with a permanent magnetic tip at the free end; this tip interacts with a magnetized structure that adds a nonlinear interaction to the model. A pure resistance matching the device’s impedance at its fundamental frequency is used to account for the output power. To verify the advantages of using the frequency up-conversion method for vibration-based energy harvesters regarding the power output and frequency band, a comparison with the linear cantilever model is analyzed. Also, in order to confirm the simulation results, a prototype of the device is built and submitted to vibration tests using a horizontally oriented motor-driven cart that recreates the motions recorded by the accelerometer; it is tested with and without the magnetic force in order to experimentally determine the nonlinearity’s effects on the power harvesting performance.
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Lamarque, Nicolas, Quentin Lamiel, Jérome Hélie et Dominique Legendre. « Spreading model for wall films generated by high-pressure sprays ». Dans ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia : Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4999.
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This paper presents a new model developed to predict the area of wall films that may develop in gasoline direct injection engines (GDI). In a always more restrictive legislation on gas emissions the injection process in internal combustion (IC) engines has been highlighted as a domain of great concern in order to satisfy these requirements. Many spray wall interactions models exist in literature and are included in different CFD tools. Most often they are based on the sum of single drop-wall impacts. The specificity of the present model lies in its simplicity and the way the film is treated globally. Here its propagation is predicted using a balance between the momentum given by the spray and the viscous shear stress. Jointly with the theoretical model, an experimental set-up has been built up, an optical measurement technique called Refractive Index Matching method is used to follow the development of the wall film.It has been found that the area of the wall film is proportional to the duration of injection, while the distance betweenthe injector and the wall has not shown many influence on the evolution of area. The influence of the injection pressure has also been identified, when the pressure is doubled the radius of the film is multiplied by 3√2. Eventuallyedicts that film thickness decreases as fuel pressure rises.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4999
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Xie, Gang, Cun-liang Liu, Lin Ye et Rui Wang. « Numerical Study on Analogy Principle of Overall Cooling Effectiveness in Engine and Laboratory Condition ». Dans ASME Turbo Expo 2018 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76162.
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The overall cooling effectiveness, which represents the distribution of dimensionless temperature on gas turbines surface, is an important parameter for conjugate heat transfer analysis of gas turbines. Generally, it is difficult to measure the overall cooling effectiveness in engine condition. However, the overall cooling effectiveness can be measured in the laboratory by matching the appropriate parameters to those of the actual turbine blade. Thus, it is important to evaluate the key parameters of matching methods. In this paper, the effects of adiabatic film effectiveness and Biot number on the overall cooling effectiveness were investigated with an impingement/effusion model by numerical simulation, in which 3-D steady RANS approach with the k–ω SST turbulence model were used. The tested plate had 8 cylinder hole rows of 30 degree inclined angle, and the internal cooling employed staggered array jet impingements. The matching performance was evaluated by comparing the results in both typical engine condition and laboratory condition. The analogy principles were discussed in detail, the results showed that the overall cooling effectiveness can be matched by using different matching principles in different lab condition. The theoretical analysis was verified by numerical results. The distribution and values of overall cooling effectiveness can be matched well between engine condition and lab condition by matching both temperature ratio, mainstream side Biot number and blowing ratio. If the temperature ratio is mismatched, the momentum flux ratio will be an important parameter for overall cooling effectiveness. Matching momentum flux ratio will reduce the difference of the adiabatic cooling effectiveness and heat transfer ratio between engine condition and laboratory condition.
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Wiese, Connor J., Carol E. Bryant et James L. Rutledge. « Flow Scaling Considerations for Internal Coolant Warming ». Dans ASME Turbo Expo 2022 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-81510.
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Abstract An increasingly common experimental technique allows measurement of overall effectiveness by matching the Biot number between experimental and engine conditions. The measured overall effectiveness distribution correlates to the actual turbine component temperature distribution. In addition to matching the Biot number, the theory also suggests that the coolant warming factor χ, must be matched. While it is clear from prior work what conditions must be met to match the Biot number of an experimental campaign to that of the engine conditions, it is often taken for granted that the coolant warming factor will also be matched. In this paper we develop the theoretical requirements necessary to match χ and test their validity through experiments performed on a conducting model of a leading edge using a variety of coolant gases to test the scaling theory with a wide range of coolant fluid properties.
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Ruzziconi, Laura, Ahmad M. Bataineh, Mohammad I. Younis et Stefano Lenci. « An Imperfect Microbeam Electrically Actuated : Experimental Investigation and Parameter Identification ». Dans ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70505.
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In this study we present a theoretical and experimental investigation of a microelectromechanical system (MEMS). The device is constituted of a clamped-clamped polysilicon microbeam electrostatically and electrodynamically actuated. The microbeam has imperfections in the geometry, which are related to the microfabrication process. Using a laser Doppler vibrometer, experimental testing based on forward and backward sweeps is conducted in a neighborhood of the first symmetric natural frequency. Our aim is that of introducing a simple mechanical model, which, despite the inevitable approximations, is able to catch and predict the most relevant aspects of the device response. Many parameters of the microbeam are unknown. Their values are identified by developing a parametric analysis, which is based on matching the experimental natural frequencies and the experimental frequency response diagrams. Extensive simulations are performed. Theoretical and experimental frequency responses are analyzed in detail at increasing values of electrodynamic excitation. A satisfactory concurrence of results is achieved, not only at low electrodynamic loads, but also at higher ones, when the escape (dynamic pull-in) becomes impending. This confirms that, despite the apparent simplicity, the proposed theoretical model is able to simulate the complex dynamics of the device accurately and properly.
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Al-Safran, Eissa, Batoul Al-Ali et Hessah Alrashidi. « Evaluation and Modeling of Asphaltene Deposition in Oil Wells ». Dans SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206366-ms.
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Abstract Asphaltene deposition in oil wells is a challenging flow-assurance phenomenon that affects the well production, project economics, and operational safety. While asphaltene precipitation is governed by the hydrocarbon mixture thermodynamics, Asphaltene deposition is governed by the complexity of flow hydrodynamic behavior and characteristics. This study aims to evaluate and compare the performance of the existing asphaltene deposition models and improve the current theoretical understanding of the deposition phenomenon by developing better predictive asphaltene deposition model. A large experimental database is collected, including aerosol and asphaltene particles deposition in air and crude oil systems, respectively, to carry on the evaluation. The results of this study revealed that Kor and Kharrat (2017) model of transport coefficient, which accounts for both diffusional and inertial deposition mechanisms outperformed other models in matching the transport coefficient from aerosol/air data. In addition, an improved sticking probability model is proposed in this study, and curve fitted using corrected deposition flux data to obtain the model constant. The improved model is not only physically sound, i.e. SP≥1, but also it requires less input data than other models. A validation study of the improved model shows a slight over prediction of experimental data with an absolute average error of 6.8% and standard deviation of 11.4%. The significance of this work is to provide theoretical predictive tool for asphaltene deposition in pipes to enable prevention, mitigation, and management of oil field asphaltene deposition strategies.
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Weir, William C. S., Richard D. Sisson et Sudhangshu Bose. « Specifying EB-PVD Process Parameters for Coating of a Second Stage Turbine Blade Using an Experimentally Verified CAD Model of the Process ». Dans ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42258.
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A model was developed to predict the thickness of the thermal barrier coating (TBC) applied to specific points on a rotating PW4000 second stage turbine blade using electron beam physical vapor deposition (EB-PVD). The theoretical model of coating deposition rates as a function of position in the PVD vapor cloud (Knudsen cosine law) was experimentally verified. The experimental work consisted of a series of four turbine blades coated under various coating conditions. Based on the verified model, a UniGraphics (UG) CAD model of the process was built. A UG User Function (UFunc) was programmed to predict coating thickness for a wide variety of EB-PVD process parameters to populate a database of contoured coating profiles. A software tool was then developed to specify the manufacturing process parameters to fabricate a contoured EB-PVD TBC of partially stabilized zirconia. A coating profile matching routine was included in the software to identify the process parameters closest to the desired coating profile. The focus of this paper is on the experimental methods, the CAD model and the software tool.
Rapports d'organisations sur le sujet "Theoretical matching model"
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Mintii, Iryna S., Svitlana V. Shokaliuk, Tetiana A. Vakaliuk, Mykhailo M. Mintii et Vladimir N. Soloviev. Import test questions into Moodle LMS. [б. в.], septembre 2019. http://dx.doi.org/10.31812/123456789/3271.
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The purpose of the study is to highlight the theoretical and methodological aspects of preparing the test questions of the most common types in the form of text files for further import into learning management system (LMS) Moodle. The subject of the research is the automated filling of the Moodle LMS test database. The objectives of the study: to analyze the import files of test questions, their advantages and disadvantages; to develop guidelines for the preparation of test questions of common types in the form of text files for further import into Moodle LMS. The action algorithms for importing questions and instructions for submitting question files in such formats as Aiken, GIFT, Moodle XML, “True/False” questions, “Multiple Choice” (one of many and many of many), “Matching”, with an open answer – “Numerical” or “Short answer” and “Essay” are offered in this article. The formats for submitting questions, examples of its designing and developed questions were demonstrated in view mode in Moodle LMS.