Dissertations / Theses on the topic 'Hybrid model'
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Weingarten, Leopold. "Physical Hybrid Model : Measurement - Experiment - Simulation." Thesis, Uppsala universitet, Fasta tillståndets fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176412.
Full textWall, Wolfe. "A hybrid model of proton scattering /." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59833.
Full textMonaghan, Anne. "Beyond transformative mediation : a hybrid model." Thesis, Ulster University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581970.
Full textMei, Zhu. "Structural hybrid simulation with model updating of material constitutive model." Doctoral thesis, Università degli studi di Trento, 2018. https://hdl.handle.net/11572/368550.
Full textMei, Zhu. "Structural hybrid simulation with model updating of material constitutive model." Doctoral thesis, University of Trento, 2018. http://eprints-phd.biblio.unitn.it/2959/1/TESI_ZHU_MEI.pdf.
Full textSitanggang, Khairil Irfan. "Boussinesq-equation and rans hybrid wave model." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2795.
Full textMurphy, Hunter A. "Hybrid image/model based gaze-contingent rendering." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1202498841/.
Full textBlais, Bruno. "Model-based visual inspection of hybrid circuits." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63928.
Full textMerlin, J. H. "Hybrid mesons in the flux-tube model." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375288.
Full textHenry, Melvin Michael 1968. "Model-based estimation of probabilistic hybrid automata." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/82249.
Full textBin, Hasnan Khalid. "Methodology to develop hybrid simulation/emulation model." Thesis, Sheffield Hallam University, 2005. http://shura.shu.ac.uk/19768/.
Full textŠandera, Čeněk. "Hybridní model metaheuristických algoritmů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-234259.
Full textNatter, Martin, and Markus Feurstein. "Correcting for CBC model bias. A hybrid scanner data - conjoint model." SFB Adaptive Information Systems and Modelling in Economics and Management Science, WU Vienna University of Economics and Business, 2001. http://epub.wu.ac.at/880/1/document.pdf.
Full textSeries: Report Series SFB "Adaptive Information Systems and Modelling in Economics and Management Science"
Werner, Quentin. "Model-based optimization of electrical system in the early development stage of hybrid drivetrains." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0109.
Full textThis work analyses the challenges faced by the electric components for traction purpose in hybrid drivetrains. It investigates the components and their interactions as an independent entity in order to refine the scope of investigation and to find the best combinations of components instead of the best components combinations. Hybrid vehicle is currently a topic of high interest because it stands for a suitable short-term solution towards zero emission vehicle. Despite its advantages, it is a challenging topic because the components need to be integrated in a conventional drivetrain architecture. Therefore, the focus of this work is set on the determination of the right methods to investigate only the electric components for traction purpose. The aim and the contributions of this work lies thereby in the resolution of the following statement: Determine the sufficient level of details in modeling electric components at the system level and develop models and tools to perform dynamic simulations of these components and their interactions in a global system analysis to identify ideal designs of various drivetrain electric components during the design process. To address these challenges, this work is divided in four main parts within six chapters. First the current status of the hybrid vehicle, the electric components and the associated optimization methods and simulation are presented (first chapter). Then for each component, the right modeling approach is defined in order to investigate the electrical, mechanical and thermal behavior of the components as well as methods to evaluate their integration in the drivetrain (second to fourth chapter). After this, a suitable method is defined to evaluate the global system and to investigate the interactions between the components based on the review of relevant previous works (chapter five). Finally, the last chapter presents the optimization approach considered in this work and the results by analyzing different system and cases (chapter six). Thanks to the analysis of the current status, previous works and the development of the simulations tools, this work investigates the relationships between the voltage, the current and the power in different cases. The results enable, under the considered assumptions of the work, to determine the influence of these parameters on the components and of the industrial environment on the optimization results. Considering the current legislative frame, all the results converge toward the same observation referred to the reference systems: a reduction of the voltage and an increase of the current leads to an improvement of the integration and the performance of the system. These observations are linked with the considered architecture, driving cycle and development environment but the developed methods and approaches have set the basis to extend the knowledge for the optimization of the electric system for traction purpose. Beside the main optimization, special cases are investigated to show the influence of additional parameters (increase of the power, 48V-system, machine technology, boost-converter…) In order to conclude, this work have set the basis for further investigations about the electric components for traction purpose in more electrified vehicle. Due to the constantly changing environment, the new technologies and the various legislative frame, this topic remains of high interest and the following challenges still need to be deeper investigated: * Application of the methods for other drivetrain architecture (series hybrid, power-split hybrid, fuel-cell vehicle, full electric vehicle), * Investigation of new technologies such as silicon-carbide for the power electronics, lithium–sulfur battery or switch reluctance machine, * Investigation of other driving cycle, legislative frame, * Integration of additional power electronics structure, * Further validation of the modeling approaches with additional components
Gate, James Simon. "Applications of finite model theory : optimisation problems, hybrid modal logics and games." Thesis, Durham University, 2013. http://etheses.dur.ac.uk/7015/.
Full textMosaffa, Payman. "Hybrid cell-centred/vertex model for multicellular systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461678.
Full textEsta tesis presenta un modelo híbrido para la simulación mecánica de monocapas celulares. Este modelo combina métodos de vértices y centrados en la célula, y está orientado al análisis de deformaciones con reorganización celular. Los núcleos vienen representados por nodos que forman una malla triangular, mientras que las contornos (membranas y córtex) forman una malla poligonal de vértices. Las dos mallas se acoplan a través de una restricción cinemática que puede ser relajada de forma controlada. El estudio hace especial hincapié en los cambios de conectividad, tanto debidos a la reorganización celular como el remodelado del citoesqueleto. Estas situaciones se abordan a través de una longitud de referencia variable y aplicando un Mapeo con Conservación de Equilibrio (EPM) que minimiza el error en el equilibrio nodal y en los vértices. La técnica resultante puede ser adaptada progresivamente a través de un parámetro, dando lugar a un modelo exclusivamente de vértices o a uno de centros. Sus propiedades se ilustran en simulaciones de monocapas sujetas a una extensión impuesta y durante el proceso de cicatrizado de heridas. La evolución de las fuerzas y los efectos del EPM durante el remodelado se analizan en estos ejemplos.
Vasilev, Viktor. "An interactive 3D interface for hybrid model specification." Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-35366.
Full textZakaria, Mohamed Ramzy. "The hybrid model, and adaptive educational hypermedia frameworks." Thesis, University of Nottingham, 2004. http://eprints.nottingham.ac.uk/14247/.
Full textSproston, Jeremy James. "Model checking of probabilistic timed and hybrid systems." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391021.
Full textBonilha, Murilo Weingarten. "A hybrid deterministic-probabilistic model for vibroacoustic studies." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242537.
Full textChitilian, Varouj A. (Varouj Armen) 1976. "A hybrid deformable model 3-D segmentation algorithm." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80526.
Full textIncludes bibliographical references (p. 151).
by Varouj A. Chitilian.
S.B.and M.Eng.
Young, Brady W. (Brady William). "Physical model of a hybrid electric drive train." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36821.
Full textIncludes bibliographical references (p. 36).
A motor and flywheel system was designed to simulate the dynamics of the electric drive train and inertial mass of a hybrid electric vehicle. The model will serve as a test bed for students in 2.672 to study the energy losses between the battery, motor, and kinetic energy of the car during acceleration and regenerative braking over a range of realistic driving profiles. The goal is to maintain fidelity to the dynamics of a road-worthy vehicle while making the model lab-safe and simple to operate. The model drive train will be designed on a one-to-one scale with the vehicle to be simulated. A motor and controller from an electric vehicle will be purchased to provide realistic electric drive for the system. The kinetic energy of the car will be simulated by a flywheel of equivalent mass. To keep the total energy in the system low enough to satisfy safety concerns, the system will be limited to simulating the motion of a light car moving up to ten miles per hour, representative of stop-and-go city traffic.
by Brady W. Young.
S.B.
Stöver, Hanna. "Metaphor and relevance theory : a new hybrid model." Thesis, University of Bedfordshire, 2010. http://hdl.handle.net/10547/145619.
Full textGoodell, Brandon Grae. "Bifurcation Portrait of a Hybrid Spiking Neuron Model." Thesis, North Dakota State University, 2012. https://hdl.handle.net/10365/26666.
Full textTantrum, Jeremy. "Model based and hybrid clustering of large datasets /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/8933.
Full textPratap, Kadam Poonam. "Radiometric Calibration of a Hybrid RCWT Imaging Model." Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/339045.
Full textJiang, Peng. "A Hybrid Risk Model for Hip Fracture Prediction." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/579112.
Full textAkermi, Imen. "A hybrid model for context-aware proactive recommendation." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30101/document.
Full textJust-In-Time recommender systems involve all systems able to provide recommendations tailored to the preferences and needs of users in order to help them access useful and interesting resources within a large data space. The user does not need to formulate a query, this latter is implicit and corresponds to the resources that match the user's interests at the right time. Our work falls within this framework and focuses on developing a proactive context-aware recommendation approach for mobile devices that covers many domains. It aims at recommending relevant items that match users' personal interests at the right time without waiting for the users to initiate any interaction. Indeed, the development of mobile devices equipped with persistent data connections, geolocation, cameras and wireless capabilities allows current context-aware recommender systems (CARS) to be highly contextualized and proactive. We also take into consideration to which degree the recommendation might disturb the user. It is about balancing the process of recommendation against intrusive interruptions. As a matter of fact, there are different factors and situations that make the user less open to recommendations. As we are working within the context of mobile devices, we consider that mobile applications functionalities such as the camera, the keyboard, the agenda, etc., are good representatives of the user's interaction with his device since they somehow stand for most of the activities that a user could use in a mobile device in a daily basis such as texting messages, chatting, tweeting, browsing or taking selfies and pictures
Kronberg, Craig. "Economics of Hybrid Long-Haul Trucks." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_theses/210.
Full textMaheo, Aurèle. "Improving the Hybrid model MPI+Threads through Applications, Runtimes and Performance tools." Thesis, Versailles-St Quentin en Yvelines, 2015. http://www.theses.fr/2015VERS039V/document.
Full textTo provide increasing computational power for numerical simulations, supercomputers evolved and arenow more and more complex to program. Indeed, after the appearance of shared memory systemsemerged architectures such as NUMA (Non Uniform Memory Access) systems, providing several levelsof parallelism. Another constraint, the decreasing amount of memory per compute core, has to bementioned. Therefore, parallel models such as Message Passing Interface (MPI) are no more sufficientto enable scalability of High Performance applications, and have to be coupled with another modeladapted to shared memory architectures. OpenMP, as a de facto standard, is a good candidate to bemixed with MPI. The principle is to use this model to augment legacy codes already parallelized withMPI. But hybridizing scientific codes is a complex task, bottlenecks exist and need to be identified. Thisthesis tackles these limitations and proposes different contributions following various aspects. Our firstcontribution reduces the overhead of the OpenMP layer by optimizing the creation and synchronizationof threads for MPI+OpenMP codes. On a second time, we target MPI collective operations. Our contributionconsists in proposing a technique to exploit idle cores in order to help the operation, with theexample of MPI Allreduce collective. We also introduce unified Collectives involving both MPI tasks andOpenMP threads. Finally, we focus on performance analysis of hybrid MPI+OpenMP codes, and ourlast contribution consists in the implementation of OpenMP Tools API (OMPT), an instrumentation tool,inside the OpenMP runtime of MPC framework. This tool allows us to instrument and profile OpenMPconstructs and allows the analysis of both runtime and application sides
Castellanos, Carrazana Abel. "Performance model for hybrid MPI+OpenMP master/worker applications." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/283403.
Full textIn the current environment, various branches of science are in need of auxiliary high-performance computing to obtain relatively short-term results. This is mainly due to the high volume of information that needs to be processed and the computational cost demanded by these calculations. The benefit to performing this processing using distributed and parallel programming mechanisms is that it achieves shorter waiting times in obtaining the results. To support this, there are basically two widespread programming models: the model of message passing based on the standard libraries MPI and the shared memory model with the use of OpenMP. Hybrid applications are those that combine both models in order to take the specific potential of parallelism of each one in each case. Unfortunately, experience has shown that using this combination of models does not necessarily guarantee an improvement in the behavior of applications. There are several parameters that must be considered to determine the configuration of the application that provides the best execution time. The number of process that must be used,the number of threads on each node, the data distribution among processes and threads, and so on, are parameters that seriously affect the performance of the application. On the one hand, the appropriate value of such parameters depends on the architectural features of the system (communication latency, communication bandwidth, cache memory size and architecture, computing capabilities, etc.), and, on the other hand, on the features of the application. The main contribution of this thesis is a novel technique for predicting the performance and efficiency of parallel hybrid Master/Worker applications. This technique is known as model-based regression trees into the field of machine learning. The experimental results obtained allow us to be optimistic about the use of this algorithm for predicting both metrics and to select the best application execution parameters.
Sachs, Julia [Verfasser]. "Model-Based Optimization of Hybrid Energy Systems / Julia Sachs." Aachen : Shaker, 2016. http://d-nb.info/1101185112/34.
Full textLee, Hyun Seung. "A HYBRID MODEL FOR DTM GENERATION FROM LIDAR DATA." MSSTATE, 2004. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11022004-053808/.
Full textSundström, Christofer. "Model Based Vehicle Level Diagnosis for Hybrid Electric Vehicles." Doctoral thesis, Linköpings universitet, Fordonssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-105487.
Full textSaad, Sameh M. I. "Design and analysis of a flexible hybrid assembly model." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240491.
Full textGerlach, Jorg C. "Culture model for hepatocytes in hybrid liver support bioreactors." Thesis, University of Strathclyde, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248963.
Full textLiu, Enjie. "A hybrid queueing model for fast broadband networking simulation." Thesis, Queen Mary, University of London, 2002. http://qmro.qmul.ac.uk/xmlui/handle/123456789/3815.
Full textHulcher, Zachary R. "Resolution effects in the hybrid strong/weak coupling model." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/111887.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 33-34).
Within the context of a hybrid strong/weak coupling model of jet quenching, we study the consequences of the fact that the plasma produced in a heavy ion collision cannot resolve the substructure of a collimated parton shower within it to arbitrary resolution. We introduce a screening length parameter, LRes, proportional to the inverse of the local temperature in the plasma, estimating the value of the proportionality constant from both weakly coupled QCD calculations and holographic calculations appropriate in strongly coupled plasma. We then modify the hybrid model so that when a parton in a jet shower splits, its two offspring are initially treated as unresolved, and are only treated as two separate partons losing energy independently after they are separated by a distance LRes. This modification delays the quenching of partons with intermediate energy, resulting in the survival of more hadrons in the final state with PT in the several GeV range. We demonstrate that this effect modifies the jet shapes and jet fragmentations functions, as it makes it more probable for particles carrying a small fraction of the jet energy at larger angles from the jet axis to survive their passage through the quark-gluon plasma. We analyze the consequences of different choices for the value of the resolution length LRes on both partonic and hadronic jet shapes and fragmentation functions, as well as on missing-PT observables. More generally, we discuss the qualitative consequences, and importance, of including the effects of finite resolution.
by Zachary R. Hulcher.
S.B.
Selles, Anthony. "Hybrid model : investigating bilingual language production through code-switching." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31373.
Full textHulcher, Zachary R. "Resolution effects in the hybrid strong/weak coupling model." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111887.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 33-34).
Within the context of a hybrid strong/weak coupling model of jet quenching, we study the consequences of the fact that the plasma produced in a heavy ion collision cannot resolve the substructure of a collimated parton shower within it to arbitrary resolution. We introduce a screening length parameter, LRes, proportional to the inverse of the local temperature in the plasma, estimating the value of the proportionality constant from both weakly coupled QCD calculations and holographic calculations appropriate in strongly coupled plasma. We then modify the hybrid model so that when a parton in a jet shower splits, its two offspring are initially treated as unresolved, and are only treated as two separate partons losing energy independently after they are separated by a distance LRes. This modification delays the quenching of partons with intermediate energy, resulting in the survival of more hadrons in the final state with PT in the several GeV range. We demonstrate that this effect modifies the jet shapes and jet fragmentations functions, as it makes it more probable for particles carrying a small fraction of the jet energy at larger angles from the jet axis to survive their passage through the quark-gluon plasma. We analyze the consequences of different choices for the value of the resolution length LRes on both partonic and hadronic jet shapes and fragmentation functions, as well as on missing-PT observables. More generally, we discuss the qualitative consequences, and importance, of including the effects of finite resolution.
by Zachary R. Hulcher.
S.B.
Modi, Rishit Bipinkumar. "Control-Oriented Thermal Model for a Hybrid Vehicle Battery." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/98661.
Full textMaster of Science
In a bid to reduce vehicular emissions, automobile manufacturers are moving towards electric and hybrid vehicles. Most hybrid vehicles have an energy storage system in addition to the conventional Internal Combustion (I.C.) engine. Lithium-ion batteries are used as energy storage systems in most hybrid vehicles due to their high energy density, long life and low self discharge rate. Lithium-ion batteries can be operated efficiently only in a narrow range of temperature. Operating these batteries outside of this temperature range results in their faster degradation which results in lower performance of hybrid vehicle. Due to this limi- tation, prevention of overheating in Lithium-ion batteries is extremely important. To keep the operation of Lithium-ion batteries within specified temperature limits, most batteries in hybrid vehicles are equipped with battery management systems (BMS). The BMS monitors cell voltage, cell temperature and applied current and keeps the temperature of cells within allowable limits. BMS of the battery pack used in this work has fan system for air-cooling the individual cells, and can lower the temperature rise of the cells by varying the fan speed. This BMS has limited temperature sensors that can predict surface temperature of few cells of the battery pack. Additional temperature information can be used to improve thermal control of the battery pack. This work presents a simplified thermal model that can be used in controller of a BMS to improve thermal control of cells and keep the temperature of cells within specified limits.
Sterley, Christopher. "Characteristic function pricing with the Heston-LIBOR hybrid model." Master's thesis, Faculty of Commerce, 2019. http://hdl.handle.net/11427/31273.
Full textWright, James Frederick Carleton University Dissertation Geography. "A hybrid model for predicting permafrost occurrence and thickness." Ottawa, 1995.
Find full textTakahashi, Ribeka. "A Hybrid Bishop-Hill Model for Microstructure Sensitive Design." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3528.
Full textLi, Yuntao. "Federated Learning for Time Series Forecasting Using Hybrid Model." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254677.
Full textTidseriedata har blivit allmänt förekommande tack vare överkomliga kantenheter och sensorer. Mycket av denna data är värdefull för beslutsfattande. För att kunna använda datan för prognosuppgifter har den konventionella centraliserade metoden visat brister avseende storskalig datakommunikation och integritetsfrågor. Vidare har neurala nätverksmodeller inte klarat av att utnyttja den extra informationen från tidsserierna, vilket leder till misslyckanden med att ge specifikt tidsserierelaterade resultat. Båda frågorna exponerar en utmaning för storskalig tidsserieprognostisering med neurala nätverksmodeller. Alla dessa begränsningar leder till vår forskningsfråga:Kan vi realisera decentraliserad tidsserieprognostisering med en federerad lärningsmekanism som presterar jämförbart med konventionella centrala lösningar i prognostisering?I det här arbetet föreslår vi ett ramverk för federerad tidsserieprognos som löser utmaningen genom att låta användaren behålla data lokalt och lära sig en delad modell genom att aggregera lokalt beräknade uppdateringar. Dessutom utformar vi en hybrid modell för att möjliggöra neurala nätverksmodeller som kan utnyttja den extra informationen från tidsserierna för att uppnå inlärning av specifika tidsserier. Den föreslagna hybrida modellen presterar bättre än state-of-art centraliserade grundläggande modeller med NN5och Ericsson KPIdata. Samtidigt ger den federerade ansatsen jämförbara resultat med de datacentrala ansatserna för både NN5och Ericsson KPI-data. Dessa resultat svarar tillsammans på forskningsfrågan av denna avhandling.
Sundbrandt, Markus. "Control of a Ground Source Heat Pump using Hybrid Model Predictive Control." Thesis, Linköpings universitet, Reglerteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-71369.
Full textHuda, Shamsul. "Hybrid training approaches to Hidden Markov Model-based acoustic models for automatic speech recognition." Thesis, University of Ballarat, 2008. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/39435.
Full textYu, Hsiang-Pai, and 游翔百. "Constructing Hybrid Credit Scoring Model." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/71398712783685563702.
Full text國立交通大學
工業工程與管理系所
92
Credit scoring is an essential task for banks and loan companies in the last few decades. The demand of developing a credit scoring model with reliable accuracy has become an urgent issue. Among many studies of credit scoring, artificial neural network (ANN) is a promising technique to achieve high accuracy of classification compared to existing conventional techniques. However, the poor explanation power makes ANN difficult to produce interpretable result. This drawback also decreases the power of ANN applied in practical problems. The objective of this study is to propose a hybrid credit scoring model which is combined with CART and other algorithms to enhance the accuracy of credit scoring model, and increase the interpretable capability as well. Financial loan companies can employ this study when establishing their credit scoring models.
Ashrafullina, Ksenia. "Hybrid Model for Regulating Carbon." Master's thesis, 2010. http://www.nusl.cz/ntk/nusl-278886.
Full textYang, Chih-Wei, and 楊智為. "A Hybrid Model of HO-IRT and HO-DINA Models." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/13533650739777251686.
Full text國立臺中教育大學
教育測驗統計研究所
102
In recent years, some higher-order item response theory (HO-IRT) models and higher-order DINA (HO-DINA) models were proposed. HO-IRT models can provide the overall ability and domain abilities estimators simultaneously. HO-DINA can provide the overall ability and cognitive diagnosis information in the same model. The purpose of this study is to develop a hybrid model of HO-IRT and HO-DINA models which is called multilevel DINA (ML-DINA). The first level is overall ability and the second level is domain abilities. The third level is cognitive attributes based on DINA model. The feasibility of the proposed model is investigated by a simulation study with variables (regression coefficients, number of subscales, sample sizes, item parameters). The major findings of this study are summarized as follows: 1. The overall ability, domain abilities, cognitive attributes, regression coefficients and item parameters, are estimated simultaneously in this model. 2. The accuracy of the estimates was relatively unaffected by the sample size. 3.The more accurate estimates of ML-DINA, when the regression coefficients were larger than 0.7. 4. Better estimates in both abilities scales can be obtained when more subscales were tested. 5.The higher quality of guessing and slip parameters brought about better item parameter estimation and classification accuracy. 6. The prior distribution associated with hierarchical structure were useful to increase the pattern correct classification rate.