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Hands-On Learning: Teaching Parallel and Distributed Computing through Unplugged Activities in Undergraduate CS Courses 24

Hands-On Learning: Teaching Parallel and Distributed Computi...

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Proceedings of the SC '24 Workshops of the International Conference on High Performance Computing, Network, Storage, and Analysis

作者： Anurag Dasgupta Venkat Margapuri Simon Shamoun Shubbhi Taneja Matthew Toups Computer Science and Engineering Technology Valdosta State University Valdosta GA Department of Computing Sciences Villanova University Villanova PA Department of Computer Science Hofstra University Hempstead NY Department of Computer Science Worcester Polytechnic Institute Worcester Massachusetts Computer Science Department Tulane University New Orleans LA

ISBN: (纸本)9798350355543

The authors present and evaluate an unplugged activity to introduce parallel computing concepts to undergraduate students. Students in five CS classrooms used a deck of playing cards in small groups to consider how parallelization can improve performance and how improvement decreases with increased parallelization. Before and after the activity, students took a short survey about their solution and their ideas about parallelism. The authors carried out this activity in seven courses at five institutions in the 2023-2024 academic year. The results showed that students had an increased appreciation for parallelization and this type of activity.

关键词： CS

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Gravity Compensation of the dVRK-Si Patient Side Manipulator based on Dynamic Model Identification

arXiv

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arXiv 2025年

作者： Zhou, Haoying Yang, Hao Deguet, Anton Fichera, Loris Wu, Jie Ying Kazanzides, Peter Department of Robotics Engineering Worcester Polytechnic Institute MA United States Laboratory for Computational Sensing and Robotics JHU MD United States Department of Computer Science Vanderbilt University TN United States Department of Computer Science Johns Hopkins University MD United States

The da Vinci Research Kit (dVRK, also known as dVRK Classic) is anopen-source teleoperated surgical robotic system whose hardware is obtainedfrom the first generation da Vinci Surgical System (Intuitive, Sunnyvale, CA,USA). The dVRK has greatly facilitated research in robot-assisted surgery overthe past decade and helped researchers address multiple major challenges inthis domain. Recently, the dVRK-Si system, a new version of the dVRK which usesmechanical components from the da Vinci Si Surgical System, became available tothe community. The major difference between the first generation da Vinci andthe da Vinci Si is in the structural upgrade of the Patient Side Manipulator(PSM). Because of this upgrade, the gravity of the dVRK-Si PSM can no longer beignored as in the dVRK Classic. The high gravity offset may lead to relativelylow control accuracy and longer response time. In addition, althoughsubstantial progress has been made in addressing the dynamic modelidentification problem for the dVRK Classic, further research is required onmodel-based control for the dVRK-Si, due to differences in mechanicalcomponents and the demand for enhanced control performance. To address theseproblems, in this work, we present (1) a novel full kinematic model of thedVRK-Si PSM, and (2) a gravity compensation approach based on the dynamic modelidentification. © 2025, CC BY.

关键词： Surgical equipment

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Nonlinear hybrid vector finite element method for modeling wave propagation in nonlinear media

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RADIO SCIENCE 1996年第4期31卷 913-922页

作者： Polstyanko, SV Lee, JF Department of Electrical and Computer Engineering Worcester Polytechnic Institute

In this paper a unified computer-aided approach based on the vector finite element method is proposed to study the propagation of optical waves in dielectric nonlinear waveguides. Most of the existing methods are based on the scalar Helmholtz wave equation and cannot adequately describe the vectorial properties of fields in nonlinear optical structures. To take into account vectorial field properties and properties of the medium without limitations, a new nonlinear hybrid vector finite element method based on the vectorial wave equation is developed. Several numerical examples are given to demonstrate the applicability of this method.

关键词： Optical waveguides Finite element analysis Nonlinear optics Optical beams Electric fields Mathematical model

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AN EXPLICIT NUMERICAL TIME-DOMAIN FORMULATION TO SIMULATE PULSED PRESSURE WAVES IN VISCOUS FLUIDS EXHIBITING ARBITRARY FREQUENCY POWER-LAW ATTENUATION

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IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL 1995年第6期42卷 1040-1049页

作者： WISMER, MG LUDWIG, R Electrical and Computer Engineering Department Worcester Polytechnic Institute Worcester MA USA

An explicit time domain algorithm is developed which is capable of numerically simulating pulsed pressure waves propagating through media whose attenuation increases with frequency according to a power law dependency. Because of possible noninteger exponents in the power law formulation, standard temporal differential operators cannot be defined and traditional finite difference approximations are therefore inappropriate, We derive a method that is consistent with the fact that the complex wavenumber often must include a nonlinear phase if system causality is to be ensured. This phase is derived from the power law attenuation and, due to their interdependency, the two terms in the wave equation corresponding to attenuation and phase can be combined into a single factor, This so-called dispersion wave equation is mapped into complex discrete-time frequency, In this domain, noninteger exponents can be eliminated via a power series expansion, and the resulting equations transform naturally to discrete time operators, The algorithm is tested by comparing numerically evaluated attenuation with the exact power law form, and the issues of stability in relation to the convergence of the power series and the accuracy of the mapping are investigated.

关键词： Series expansions Pulse Pressure Power series Wave equation TIME-DOMAIN viscous fluids Pressure waves Power law

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ON THE STRUCTURE OF A MULTIPURPOSE INTRODUCTORY COURSE IN computer ARCHITECTURE AT THE worcester-polytechnic-institute

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IEEE TRANSACTIONS ON EDUCATION 1995年第3期38卷 230-236页

作者： ROTITHOR, HG Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA USA

In this paper, we describe the structure and contents of an introductory course in computer architecture that is designed to meet multiple objectives and offered to the first year graduate students and senior undergraduate students at the worcester polytechnic institute. The objectives include providing a solid background in computer architecture to senior undergraduate students, providing prerequisite preparation for advanced computer engineering courses to the graduate students, and offering a self sufficient study of the computer architecture field to those students who do not pursue further courses in the field. Appropriate projects integrated into the course and public domain tools that were used to facilitate the project assignments are described, The paper describes important issues that were addressed in designing the course structure and its contents, The effectiveness of the approach presented in this paper is supported from our experience that has resulted after multiple offerings of the course over a period of three years.

关键词： computer architecture Hardware Software tools Solids Computational modeling computer simulation Assembly Laboratories

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ULTRASONIC-ATTENUATION BASED ON THE RONEY GENERALIZED THEORY AND MULTIPLE POWER-LAW GRAIN-SIZE DISTRIBUTIONS

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IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL 1994年第1期41卷 144-149页

作者： NICOLETTI, D KASPER, D Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA USA

We investigate ultrasonic attenuation as a nondestructive determination of grain-size distributions. Previous work showed power-law relationships between the wavelength dependence of ultrasonic attenuation and a single power-law grain-size distribution, along with experimental verification. The work presented here further validates the previously reported relationship for single power-law grain-size distributions, and generalizes the relationships to cases where the grain-size distribution follows multiple power-laws. Roney's generalized approach to ultrasonic attenuation is used. Numerical results are presented for the single power-law and multiple power-law cases. The attenuation exponents computed from the numerical calculations correspond well with theoretical expectations. For wavelengths greater than all the grain sizes, Rayleigh scattering dominates and the attenuation exponent approaches 4. For single power-laws and wavelengths between the smallest and largest grain size, the attenuation exponent equals the grain-size distribution exponent. When multiple power-laws are used to describe the grain-size distribution, the attenuation exponent is a combination of the grain-size distribution exponent, and therefore cannot be directly measured from the attenuation curve.

关键词： Power law Ultrasonic attenuation Exponent Frequency dependence Particle size distribution size distribution attenuation curve wavelengths

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A NEW INTRODUCTORY ELECTRICAL-engineering CURRICULUM FOR THE 1ST-YEAR STUDENT

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IEEE TRANSACTIONS ON EDUCATION 1994年第2期37卷 171-177页

作者： CYGANSKI, D NICOLETTI, D ORR, JA Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA USA

This paper reports on our experience with respect to a major revision of the introductory Electrical engineering curriculum at worcester polytechnic institute. The new curriculum incorporates classroom and laboratory experience in electrical engineering for first-year students. The new courses are based on the ''spiral'' approach to education in which concepts are introduced at an applications-oriented level, and then repeatedly revisited with successively greater levels of detail and theoretical sophistication. The plan that has been adopted was the result of extensive study within the department in which current students and alumni participated through surveys. An assessment plan and preliminary assessment results are discussed.

关键词： Electrical engineering Force measurement Circuit analysis Voltage Student members Laboratories Mathematics engineering education Circuit theory

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A quantitative analysis of the separation of aluminum cans out of a waste stream based on eddy current induced levitation

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IEEE TRANSACTIONS ON MAGNETICS 1997年第1期33卷 772-781页

作者： Woltereck, M Ludwig, R Michalson, W Electrical and Computer Engineering Department Worcester Polytechnic Institute Worcester MA USA

Eddy current induced levitation can be employed to separate conducting from nonconducting materials as in the recycling of aluminum products. To investigate magnetic fields, eddy currents, and forces, a multiple strategy involving analytical, numerical, and experimental analysis techniques is implemented. In particular, the configuration of an aluminum can over an arrangement of multiple coils is investigated with a two-dimensional parametric finite element model. The results from these simulations are compared to measurements of a practical levitation device. To establish the fidelity of the finite element model, we applied the method to two simplified geometries of a thick and a thin slab extended over a conducting wire. For the first case, an analytical inverse Laplace-transform model for the eddy current density is developed. For the second case, Lorentz forces exerted on the thin slab are analytically obtained by employing Maxwell's moving image method. In addition, an approximation to the moving image method is derived which can be described by an equivalent resonance circuit.

关键词： Aluminum Magnetic analysis Eddy currents Levitation Magnetic field measurement Finite element methods Slabs Conducting materials Magnetic materials Recycling

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Two- and three-dimensional numerical analysis of gradient and parasitic gradient fields of a three-channel surface gradient coil for magnetic resonance imaging

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IEEE TRANSACTIONS ON MAGNETICS 1996年第1期32卷 195-207页

作者： Shi, FA Ludwig, R Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA USA

For many organ-specific magnetic resonance imaging (MRI) applications, surface gradient coils (SGCs) offer an attractive alternative to the whole-body gradient coils presently employed in MR scanners. This investigation develops a 2D and 3D numerical analysis and design strategy based on the magnetic scalar and vector potentials to obtain the field strength and field linearity within a localized imaging area. It is demonstrated that for a predefined volume of interest, a given planar SGC configuration can achieve up to 80 Gauss/cm magnetic field gradient, which significantly exceeds the 1-3 Gauss/cm of whole-body coils based on the same current excitation of 100 A and inductance employed in typical whole-body instruments. In order to test the accuracy of our numerical design, a G(y) gradient coil was fabricated. It is found that the measured field distribution is in excellent agreement with our 3D theoretical predictions. Furthermore, this G,, gradient coil was installed in a GE CSI II 2 Tesla 15 cm bore MRI instrument which permits a direct comparison of the image quality with the computer predicted field linearity. Therefore, this numerical modeling approach proves very useful in analyzing and ultimately optimizing planar SGC coils for organ-specific MRI applications.

关键词： Numerical analysis Coils Magnetic resonance imaging Linearity Gaussian processes Instruments Magnetic fields Inductance Testing Magnetic field measurement

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FINITE-ELEMENT ANALYSIS OF LOSSY DIELECTRIC WAVE-GUIDES

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1994年第6期42卷 1025-1031页

作者： LEE, JF Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA USA

This paper presents a full-wave analysis of lossy dielectric waveguides using a hybrid vector finite element method. To avoid the occurrences of spurious modes in the formulation, edge elements and first-order nodal finite element basis functions are used to span the transverse and the z components of the electric field, respectively. Furthermore, the direct matrix solution technique with minimum degree of reordering has been combined with the modified Lanczos algorithm to solve for the resultant sparse generalized eigenmatrix equation efficiently.

关键词： Dielectric losses Finite element methods Integrated circuit modeling Integrated circuit interconnections Electromagnetic waveguides Transmission line matrix methods Frequency Maxwell equations Predictive models LAN interconnection

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