Global ETD Search

1	Extraction of Broadband Equivalent Models of Hybrid Interconnect Structures Chen, Sheng-Yu 23 July 2008 (has links) The thesis proposes a hybrid broadband equivalent model extraction method, and our goal is to combine via structure and irregular transmission line in print circuit board for extraction of broadband SPICE-compatible model by using the time domain algorithm and full wave simulation in frequency domain, respectively. We can construct broadband SPICE-compatible macro-model scalable library with two kind of different extraction methods, tow kind of extraction of equivalent model can construct the circuit structure for designer demand. Every modules of the broadband macro model of the two extraction models are represented by the optimum pole-residue forms. Using a systematic lumped-model extraction technique, all the optimum pole-residue rational functions can be transfered into a corresponding lumped circuit model. The accuracy of Extraction of Broadband Equivalent Models is demonstrated in frequency -domain responses compared with the 3D-FDTD or HFSS simulation. In addition, the extraction model can simulate in commercial tools effectively, ex: Hspice¡BADS. Even the model can simulate signal integrality and power integrality in Hspice or ADS. Vector Fitting Method Equivalent Model Extraction Pencil Matrix Method
2	Convexity-Preserving Scattered Data Interpolation Leung, Nim Keung 12 1900 (has links) Surface fitting methods play an important role in many scientific fields as well as in computer aided geometric design. The problem treated here is that of constructing a smooth surface that interpolates data values associated with scattered nodes in the plane. The data is said to be convex if there exists a convex interpolant. The problem of convexity-preserving interpolation is to determine if the data is convex, and construct a convex interpolant if it exists. Computer-aided design. Convex surfaces. surface fitting method computer aided geometric design
3	A Study of Post-Weld-Shift Measurement Technology in Cylindrical-Type Laser Diode Module Packages He, Yue-Lin 12 July 2004 (has links) The objective of this study is to investigate the technique of the PWS (Post-Weld-Shift) measurement in cylindrical-type laser diode module packaging processes. Including measure the shift in focus plane and the run-out between the axis of laser diode and optical fiber. The objective of this technique is to quantify the PWS in packaging processes. This technique can improve the efficient of the laser hammering technique. The measurement technique developed in this study employs a laser displacement meter (Keyence LC-2430) to measure the profile and position the upper housing of laser diode module. Using the concepts of ellipse and symmetric figure, the Ellipse Fitting Method (EFM) and the Symmetric Center Method (SCM) are developed. A simulation program is coded for discussing the relationship between the measurement error and the roundness of the optical fiber housing. Finally, these measuring technique are applied on the laser diode module packaging system (Newport-LW4000) to measure the PWS. The experimental measuring data of PWS is 3.5£gm, which is reasonable in compare to the estimate alignment offset (2.9£gm to 5.9£gm) by the coupling efficiency method. Therefore it is believed that the technique developed in this study is feasible and practical. SCM (Symmetric Center Method) PWS (Post-Weld-Shift) measurement TO-Can EFM (Ellipse Fitting Method)
4	力法を用いた有限要素モデルのモーフィング笹岡, 竜, Sasaoka, Ryu, 足達, 一真, Adachi, Kazuma, 畔上, 秀幸, Azegami, Hideyuki 11 1900 (has links) No description available. Shape Optimization Finite-Element Method Traction Method Morphing Method Fitting Method
5	脊柱有限要素モデルの個体別モデリング笹岡, 竜, Sasaoka, Ryu, 畔上, 秀幸, AZEGAMI, Hideyuki 01 1900 (has links) No description available. Shape Optimization Finite-Element Method Traction Method Morphing Method Fitting Method
6	THEORETICAL STUDY OF THERMAL ANALYSIS KINETICS Han, Yunqing 01 January 2014 (has links) In the past decades, a great variety of model fitting and model free (isoconversional) methods have been developed for extracting kinetic parameters for solid state reactions from thermally stimulated experimental data (TGA, DSC, DTA etc.). However, these methods have met with significant controversies about their methodologies. Firstly, model-fitting methods have been strongly criticized because almost any reaction mechanism can be used to fit the experimental data satisfactorily with drastic variations of the kinetic parameters, and no good criterion exists to tell which mechanism is the best choice. Secondly, previous model free methods originated from the isoconversional principle, which is often called the basic assumption; previous studies comparing the accuracy of model free methods have not paid attention to the influence of the principle on model free methods and, therefore, their conclusions are problematic. This work gives, firstly, a critical study of previous methods for evaluating kinetic parameters of solid state reactions and a critical analysis of the isoconversional principle of model free methods. Then an analysis is given of the invariant kinetic parameters method and recommends an incremental version of it. Based on the incremental method and model free method, a comprehensive method is proposed that predicts the degree of the dependences of activation energy on heating programs, and obtains reliable kinetic parameters. In addition, this work also compares the accuracy of previous methods and gives recommendations to apply them to kinetic studies. Thermal Analysis Kinetics Model Fitting method Model Free Method Comprehensive Method Activation Energy Heat Transfer, Combustion
7	SIMULTANEOUS DIMENSIONAL AND TOLERANCE SYNTHESIS IN PROCESS PLANNING SRINIVASAN, SREERAM January 2003 (has links) No description available. Engineering, Industrial tolerance synthesis design centering process planning genetic algorithms sphere fitting method
8	Trådriktningens inverkan på plagget : Visuell skillnad mellan virtuellt och fysiskt plagg Fogelberg, Alice, Möllerström, Agnes January 2020 (has links) Detta är en kandidatuppsats i designteknik som innehåller en studie om hur flera kjolmodeller med olika trådriktningar skiljer sig virtuellt mot verkligt. På dagens modeföretag är de två främsta metoderna för avprovning verklig och virtuell som används i produktutvecklingsprocessen. Dessvärre har inte alla företag tillgång till virtuell-avprovning då detta är en kostsam investering för företagen och flera menar på att det inte blir likadant virtuellt som i verkligheten. För att bemöta dessa tankar har tre olika kjolmodeller konstruerats, blivit uppsydda och provats av verkligt respektive virtuellt. En enkät har därefter utformats och skickas ut till 30st konstruktörer i branschen. Resultatet av undersökningen visar på att det finns både likheter och skillnader mellan kjolarna med samma trådriktning. 3D simuleringsprogrammet CLO kan framhäva tygets mekaniska egenskaper och ge ett så likt resultat som möjligt. Baserat på denna studie är förhoppningen att fler företag ska våga investera och börja arbeta i 3D för att således minimera antal provplagg och värna mer om miljön. / This is a Final Bachelor Degree Thesis in design technology that investigate how several skirts with different grainlines differ in reality to virtually. The two most common methods for today's product development are garment fitting in 3D and physical fittings. Unfortunately, 3D fitting is a very expensive investment for a company and some argue that it does not become the same result virtual as in reality. To respond to these thoughts, three skirts has been constructed, sewn, and fitted virtual as physical. Thereafter, a questionnaire have been created and sent to 30 pattern makers. The results of the survey show that there are similarities between the skirts with the same grainlines. The 3D simulations program CLO has the opportunity to emphasize the mechanical properties of the fabric to give the same result as possible. Through this study, the hope is to encourage companies to invest and start working in 3D in order to minimize the number of sample garments and protect the environment. 3D fitting method virtual fitting grainline CLO 3D avprovningsmetod virtuell avprovning trådrak CLO Engineering and Technology Teknik och teknologier
9	NaV1.5 Modulation: From Ionic Channels to Cardiac Conduction and Substrate Heterogeneity Raad, Nour 16 January 2014 (has links) No description available. 571.4 Antiarrhythmic drugs Optical Mapping Action potential duration Spatial dispersion of repolarization Cardiac depolarization Conduction velocity Anisotropy Duchenne muscular dystrophy mdx - mouse model Dystrophin ΔKPQ mouse model Long QT Syndrome 3 Cardiac Sodium Channel (NaV1.5) Flecainide Maximum upstroke velocity Least Squares Ellipsis Fitting Method Area Fitting Method Plane Fitting Method Conduction abnormalities Voltage sensitive dyes Cardiac arrhythmia Functional heterogeneity Spatial-temporal heterogeneity Proarrhythmia Activation maps Symmetry breaking Intrinsic cardiac heterogeneity Biologie (PPN619462639)
10	Applications of the Wavelet Transform to B Mixing Analysis Cadien, Adam Samuel 06 1900 (has links) Abstract The neutral B mesons B0 and B0s can under go flavor changing oscillations due to interactions by the weak force. Experiments which measure the frequency of these state transitions produce extremely noisy results that are difficult to analyse. A method for extracting the frequency of B mesons oscillations using the continuous wavelet transform is developed here. In this paper the physics of B meson mixing is related, leading to the derivation of a function describing the expected amount of mixing present in B0 and B0s meson decays. This result is then used to develop a new method for analysing the underlying frequency of oscillation in B mixing. An introduction to wavelet theory is provided in addition to details on interpreting daughter wavelet coefficient diagrams. Finally, the effectiveness of the analysis technique produced, referred to as the Template Fitting Method, is investigated through an application to data generated using Monte Carlo methods. wavelet transform B mesons Template Fitting Method Monte Carlo mass difference extraction MatLab Curve Fitting Template data analysis B meson decay CP Violation error

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