Página 1 dos resultados de 2419 itens digitais encontrados em 0.014 segundos

‣ Acoustic Simulation of a Special Switched Reluctance Drive by Means of Field-Circuit Coupling and Multiphysics Simulation

GIET, M. van der; LANGE, E.; CORREA, D. A. P.; Chabu, Ivan Eduardo; Nabeta, Silvio Ikuyo; HAMEYER, K.
Fonte: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC Publicador: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
47.48521%
The approach presented in this paper consists of an energy-based field-circuit coupling in combination with multi-physics simulation of the acoustic radiation of electrical machines. The proposed method is applied to a special switched reluctance motor with asymmetric pole geometry to improve the start-up torque. The pole shape has been optimized, subject to low torque ripple, in a previous study. The proposed approach here is used to analyze the impact of the optimization on the overall acoustic behavior. The field-circuit coupling is based on a temporary lumped-parameter model of the magnetic part incorporated into a circuit simulation based on the modified nodal analysis. The harmonic force excitation is calculated by means of stress tensor computation, and it is transformed to a mechanical mesh by mapping techniques. The structural dynamic problem is solved in the frequency domain using a finite-element modal analysis and superposition. The radiation characteristic is obtained from boundary element acoustic simulation. Simulation results of both rotor types are compared, and measurements of the drive are presented.

‣ Modelagem e projeto de módulos amplificadores e comparadores em tecnologia CMOS 0,35um; Analysis and design of amplifiers and comparators modules in cmos 0.35um technology

Cortes, Fernando da Rocha Paixao
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Dissertação Formato: application/pdf
Português
Relevância na Pesquisa
47.34089%
Diferente do projeto de sistemas digitais, no qual as técnicas de projeto e ferramentas CAD vêm apresentando uma crescente evolução acompanhada da redução de seus preços, o projeto de sistemas analógicos CMOS ainda apresenta uma forte correlação com a experiência do projetista. Dentro deste contexto, importantes fatores como caracterização de tecnologia, modelamento de dispositivos e metodologia de projeto devem ser considerados. Este trabalho apresenta um estudo destes importantes fatores necessários para se realizar o projeto de um sistema analógico com menor custo, bom desempenho e reduzido tempo de projeto. Primeiramente, é necessária uma extensa caracterização da tecnologia CMOS a ser usada, onde os parâmetros que descrevem as caracteristicas elétricas dos dispositivos são obtidos. A partir desta caracterização e das especificações requeridas para o circuito, é feita uma modelagem e sintese a fim de se obter as dimensões dos transistores. Ferramentas para a análise do desempenho elétrico são utilizadas a seguir, antes de se realizar a descrição geométrica (layout) do circuito. Com o layout pronto, uma nova simulação elétrica é feita incluindo os efeitos geométricos, incluindo-se os parasitas R...

‣ Simulation of composite I/O automata; Simulation of composite IOA

Solovey, Edward, 1979-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 108 p.; 5346486 bytes; 5359410 bytes; application/pdf; application/pdf
Português
Relevância na Pesquisa
47.327856%
The IOA simulator is a tool that has been developed in the Theory of Distributed Systems group at MIT. This tool simulates the execution of automata described by the IOA language. It generates logs of execution traces and provides other pertinent information regarding the execution, such as the validity of specified invariants. Although the simulator supports paired simulation of two automata for the purpose of checking simulation relations, one of its limitations is its lack of support for the simulation of composite automata. A composite automaton represents a complex system and is made up of other automata, each representing a system component. This thesis concerns the addition of a capability to simulate composite automata in a manner that allows observing and debugging the individual system component automata. While there is work in progress on creating a tool that will translate a composite definition into a single automaton, the added ability to simulate composite automata directly will add modularity and simplicity, as well as ease of observing the behavior of individual components for the purpose of distributed debugging.; by Edward Solovey.; Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science...

‣ Charles River City : an educational augmented reality simulation pocket PC game; Educational augmented reality simulation pocket PC game

Cheung, Priscilla, 1980-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 86 p.; 3648536 bytes; 3657916 bytes; application/pdf; application/pdf
Português
Relevância na Pesquisa
47.327856%
This thesis has designed and implemented Charles River City, an educational, location-based augmented reality simulation game that uses Pocket PC devices and GPS technology. As mobile devices and processing power become more common and affordable, high school teachers can take advantage of these technological advances to explore new channels for teaching and motivating students. The Charles River City game seeks to engage middle to high school students in learning science in a fun and innovative way. The story and background in the game is loosely based on a previous work called River City, a desktop multi-player virtual simulation game. In Charles River City, students work in teams to investigate the cause of several illnesses in a virtual town. Through interviewing virtual characters, gathering water samples, and analyzing collected data, students learn to think and solve problems as a scientist would. A test run of the game shows that the simulation game is an effective teaching tool that gives students a hands on experience in solving a real world problem that is fun and challenging.; by Priscilla Cheung.; Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2004.; Includes bibliographical references (p. 79).

‣ BioJADE : a design and simulation tool for synthetic biological systems; Design and simulation tool for synthetic biological systems

Goler, Jonathan Ari, 1980-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 85 p.; 3341552 bytes; 3350832 bytes; application/pdf; application/pdf
Português
Relevância na Pesquisa
47.192896%
The next generations of both biological engineering and computer engineering demand that control be exerted at the molecular level. Creating, characterizing and controlling synthetic biological systems may provide us with the ability to build cells that are capable of a plethora of activities, from computation to synthesizing nanostructures. To develop these systems, we must have a set of tools not only for synthesizing systems, but also designing and simulating them. The BioJADE project provides a comprehensive, extensible design and simulation platform for synthetic biology. BioJADE is a graphical design tool built in Java, utilizing a database back end, and supports a range of simulations using an XML communication protocol. BioJADE currently supports a library of over 100 parts with which it can compile designs into actual DNA, and then generate synthesis instructions to build the physical parts. The BioJADE project contributes several tools to Synthetic Biology. BioJADE in itself is a powerful tool for synthetic biology designers. Additionally, we developed and now make use of a centralized BioBricks repository, which enables the sharing of BioBrick components between researchers, and vastly reduces the barriers to entry for aspiring Synthetic Biologists.; by Jonathan Ari Goler.; Thesis (M. Eng. and S.B.)--Massachusetts Institute of Technology...

‣ FastStokes : a fast 3-D fluid simulation program for micro-electro-mechanical systems; Fast Stokes : a fast three-dimensional fluid simulation program for MEMS

Wang, Xin, 1972 Jan. 8-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 153 p.; 6057849 bytes; 6057656 bytes; application/pdf; application/pdf
Português
Relevância na Pesquisa
47.454385%
We have developed boundary integral equation formulas and a corresponding fast 3-D Stokes flow simulation program named FastStokes to accurately simulate viscous drag forces on geometrically complicated MEMS (micro- electro- mechanical systems) devices. Unlike the 3-D finite element or finite difference solvers which often take days to run to completion or fail when geometry gets complicated, the FastStokes 3.0 simulation program is capable of simulating complicated devices such as resonators, accelerometers, and micro-mirrors on PC computers in minutes. The FastStokes 3.0 simulation program is a fast 3-D boundary-element simulation program that uses only surface discretizations. The implementation of the Precorrected-FFT algorithm in combination with the GMRES algorithm substantially improves the speed of this simulation program. An efficient two-step approach that successfully handles the null space of the singular incompressible Stokes BEM operators is developed to avoid numerical errors and solution discontinuities. An analytical flat-panel kernel integration algorithm is implemented in FastStokes and an accurate curved-panel integration algorithm is also developed. Both an incompressible FastStokes solver and a compressible FastStokes solver have been developed and tested. They are not only fast...

‣ Graphical real-time simulation tool for passive UHF RFID environments

Wolk, Jonathan E
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 117 p.; 6183391 bytes; 6188244 bytes; application/pdf; application/pdf
Português
Relevância na Pesquisa
47.36722%
In this thesis, I present the design and implementation of a real-time simulation tool, RFID Vis, that is used to simulate a UHF RFID environment. The simulation tool simulates environments containing to pallets of cases as is common in parts of the supply chain. The simulation tool consists of two parts, a graphical front end which interfaces with the user as well as displays the electromagnetic power present in a given volume of space in an intuitive manner and an electromagnetics simulation engine which takes care of all the electromagnetic calculations and approximations. The simulation tool is written in C++ using Microsoft DirectX 9.0 to interface with the graphics hardware. RFID Vis enables users to quickly simulate a real world operating scenario providing insights and building intuition.; by Jonathan E. Wolk.; Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.; Includes bibliographical references (p. 115-117).

‣ Investigating the role of simulation fidelity in laparascopic surgical training; Design of an experimental platform for measuring training effectiveness of virtual reality surgical simulations

Kim, Hyun K. (Hyun Kyu), 1977-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 55, [4] leaves; 6689687 bytes; 6692074 bytes; application/pdf; application/pdf
Português
Relevância na Pesquisa
47.36722%
Minimally invasive surgery (MIS), with its aptitude for quick recovery and minimal scarring, has revolutionized surgery over the past few years. As a result, the development of a VR-based surgical trainer for MIS has been a popular area of research. However, there still remains a fundamental question of how realistic the simulation has to be for effective training. On the one hand, learning surgical practices with an unrealistic model may lead to negative training transfer. However, because of the learning abilities and perceptual limitations of the sensory, motor, and cognitive system of the human user, perfect simulation is unnecessary. Furthermore, given the large variations in human anatomy and physiology, there is no single perfect model. The question is how simple a simulation can we get away with, while at the same time preserving a level of fidelity between the virtual and real organ behavior that leads to positive training transfer. A dual station experimental platform was set up for this study. The two stations consisted of a real environment testing station and a virtual environment training station. The fidelity of the simulation could easily be adjusted in the virtual training station so that subjects could be treated with different modes of training. With the dual station setup the real environment performance of a subject before and after VE training could be measured.; (cont.) First round of experiments on the setup were conducted to investigate the effect of haptic fidelity and the effect of part task training on surgical training. Haptic fidelity was adjusted by modeling a material of non-linear stiffness to different degrees of accuracy. Subjects were initially tested on the real station performing a bimanual pushing and cutting task. They were then trained on the virtual station...

‣ MIT integrated microelectronics device experimentation and simulation iLab; Massachusetts Institute of Technology integrated microelectronics device experimentation and simulation iLab

Cukalovic, Boris
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 58 p.
Português
Relevância na Pesquisa
47.273354%
We developed the MIT Integrated Microelectronics Device Experimentation and Simulation iLab, a new online laboratory that combines and significantly upgrades the capabilities of two existing online microelectronics labs: WebLab, a device characterization lab, and WebLabSim, a device simulation lab. The new integrated tool allows users to simultaneously run experiments on actual devices and simulations on the virtual ones, as well as to compare the results of the two. In order to achieve this, we considerably extended the capabilities of the original clients. We added the ability to graph the results of multiple experiments and simulations simultaneously, on top of each other, which allows for much easier comparison. We also added the ability to load, view and graph the results of experiments and simulations that were ran at any point in the past, even when the corresponding lab configurations are no longer available. Our hope is that this new integrated iLab will enrich microelectronics teaching and learning by allowing students to compare real life device behavior with theoretical expectations.; by Boris Cukalovic.; Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.; Includes bibliographical references (p. 57-58).

‣ Design and implementation of a sector-based airspace model for the MIT Extensible Air Network Simulation

Whittaker, Colin J
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 84 p.
Português
Relevância na Pesquisa
47.273354%
The MIT Extensible Air Network Simulation (MEANS) is a tool that has been designed to assist airline schedulers and air traffic managers in predicting flight delays for given air traffic scenarios. One aspect of the simulation, the determination of flight times, has received criticism from the MEANS users as being too simplistic for their needs. Currently, MEANS predicts flight times based on a historical distribution of observed flight times between city pairs. This system ignores the effects of flight level winds and airspace congestion, two major determiners of flight time. The replacement flight time model presented divides the airspace into discrete sectors based on existing divisions in air traffic control. Each sector has its own wind conditions and capacity limitations which affect passing flights. Results show that, after some calibration, the new flight time model produces accurate flight times when the airspace is divided into ARTCC domains and does not introduce additional errors into other parts of the simulation. Additionally, test scenarios show that the new system is capable of modeling airspace capacity events, such as a radar failure. Comparative results reveal that the old, distribution model produces surprisingly accurate flight times for typical wind conditions and airspace utilization.; by Colin J. Whittaker.; Thesis (M. Eng.)--Massachusetts Institute of Technology...

‣ Computer simulation of a novel technique for Radio-Frequency Ablation of ventricular arrhythmias

Rosbury, Tamara S
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 175 p.
Português
Relevância na Pesquisa
47.150376%
Ventricular Tachycardia (VT) is a rapid arrhythmia, most commonly due to reentrant electrical activity in the heart. A common treatment for VT is Radio-Frequency Ablation (RFA), which is minimally invasive, but requires maintenance of VT until the target site for ablation is determined. Most patients with VT cannot tolerate this maintenance phase due to hemodynamic instability and for those who are hemodynamically stable, the RFA procedure is successful in permanently terminating the VT in only approximately half of the cases. Therefore, the need for an RFA procedure that accurately localizes the site for ablation, or exit site of the reentry circuit, and is safe for unstable patients is evident. We believe utilization of the Single Equivalent Moving Dipole model and inverse problem in cardiology will prove to be efficient in localizing the exit site of the reentry circuit and guiding the ablation catheter to that localized site during the RFA procedure. In principle, our RFA technique only requires a single beat of VT to localize the exit site of the reentry circuit. The objective of this thesis is to determine in a simulation model if one can guide a catheter to the exit site of the reentry circuit using body surface potentials in order to ablate that site with radio-frequency energy.; (cont.) In our new approach to RFA...

‣ Design, modeling, and simulation of a Compact Optoelectronic Neural Coprocessor; CONCOP

Simpkins, Travis L. (Travis Lee), 1977-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 174 p.
Português
Relevância na Pesquisa
47.192896%
Microprocessors have substantially increased in speed and computational power over the past two decades. However, they still are unable to solve certain classes of problems efficiently, particularly those which involve the analysis of large noisy data sets such as the case of image processing, feature extraction, and pattern recognition. Substantial research has focused on using neural network algorithms to process this type of data with much success. Most of this effort, however, has resulted in sophisticated neural network-based software algorithms rather than physical neural network hardware. Consequently, most neural network-type processing systems today consist of neural algorithms running on traditional sequential (i.e. Intel-based) microprocessors rather than on actual neurocomputers, and thus achieve less than optimal performance. The objective of the Compact Optoelectronic Neural Coprocessor (CONCOP) project is to build a compact, pixilated, parallel optoelectronic processor capable of running neural network-type algorithms in native hardware.; (cont.) While much of the past research on the project has focused on designing and implementing the microphotonics and optoelectronics required for interlayer communication within the system...

‣ Investigation of propagation in foliage using simulation techniques

Chan, Chung Wei
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Formato: xxii, 91 p. : ill. (chiefly col.) ; 28 cm.
Português
Relevância na Pesquisa
47.27691%
In a foliage environment, radio wave propagation is subjected to fading on both large-scales and small-scales that impair the quality and reliability of data link transmission. This has implications in many military applications. An example is the performance of communications links and unmanned aerial vehicle radio links when the ground forces are operating in foliage environments. The purpose of this research is to evaluate some simple models for propagation of radio waves in foliage using an electromagnetic field simulation application. The three dimensional (3D) electromagnetic field simulation application, CST Studio Suite, was used in the modeling and simulation process. Specifically, the CST Microwave Studio module was used to model the forest using dielectric blocks. Various combinations of forest dimensions, material dielectric parameters and antenna placements were simulated to obtain propagation models of radio waves in foliage environment. The simulation models are compared to three empirical models presented in the literature for propagation in foliage environment. Using the simulation model, we examined the coverage diagram for a transmitter antenna immersed in foliage. The results show that the proposed simulation models provide a rough approximation to radiowave propagation in an actual rainforest environment. Based on the simulated results...

‣ Developing attribute acquisition strategies in spoken dialogue systems via user simulation

Filisko, Edward A. (Edward Anthony), 1977-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 169 p.
Português
Relevância na Pesquisa
47.327856%
A spoken dialogue system (SDS) is an application that supports conversational interaction with a human to perform some task. SDSs are emerging as an intuitive and efficient means for accessing information. A critical barrier to their widespread deployment remains in the form of communication breakdown at strategic points in the dialogue, often when the user tries to supply a named entity from a large or open vocabulary set. For example, a weather system might know several thousand cities, but there is no easy way to inform the user about what those cities are. The system will likely misrecognize any unknown city as some known city. The inability of a system to acquire an unknown value can lead to unpredictable behavior by the system, as well as by the user. This thesis presents a framework for developing attribute acquisition strategies with a simulated user. We specifically focus on the acquisition of unknown city names in a flight domain, through a spell-mode subdialogue. Collecting data from real users is costly in both time and resources. In addition, our goal is to focus on situations that tend to occur sporadically in real dialogues, depending on the domain and the user's experience in that domain.; (cont.) Therefore, we chose to employ user simulation...

‣ MIT Device Simulation WebLab : an online simulator for microelectronic devices; WeblabSim

Solis, Adrian (Adrian Orbita)
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 157 p.; 7134632 bytes; 7141207 bytes; application/pdf; application/pdf
Português
Relevância na Pesquisa
47.273354%
In the field of microelectronics, a device simulator is an important engineering tool with tremendous educational value. With a device simulator, a student can examine the characteristics of a microelectronic device described by a particular model. This makes it easier to develop an intuition for the general behavior of that device and examine the impact of particular device parameters on device characteristics. In this thesis, we designed and implemented the MIT Device Simulation WebLab ("WeblabSim"), an online simulator for exploring the behavior of microelectronic devices. WeblabSim makes a device simulator readily available to users on the web anywhere, and at any time. Through a Java applet interface, a user connected to the Internet specifies and submits a simulation to the system. A program performs the simulation on a computer that can be located anywhere else on the Internet. The results are then sent back to the user's applet for graphing and further analysis. The WeblabSim system uses a three-tier design based on the iLab Batched Experiment Architecture. It consists of a client applet that lets users configure simulations, a laboratory server that runs them, and a generic service broker that mediates between the two through SOAP-based web services. We have implemented a graphical client applet...

‣ Adaptive rapid environmental assessment system simulation framework

Wang, Ding, Ph. D. Massachusetts Institute of Technology
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 171 leaves; 5545846 bytes; 5553076 bytes; application/pdf; application/pdf
Português
Relevância na Pesquisa
47.192896%
Adaptive Rapid Environmental Assessment (AREA) is a new concept for minimizing the non model-based sonar performance prediction uncertainty and improving the model-based sonar performance by adaptive and rapid in situ measurement in the ocean environment. In this thesis, a possible structure of the AREA system has been developed; an AREA System Simulation Framework has been constructed using C++, which can simulate how AREA system will work and be utilized to determine the optimal or sub-optimal sampling strategies. A user's manual for the simulation framework, and specifications of all important C++ classes are included.; by Ding Wang.; Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.; Includes bibliographical references (leaves 170-171).

‣ Simulation of timed input/output automata; Simulation of TIOA

Mavrommatis, Panayiotis P
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 74 p.
Português
Relevância na Pesquisa
47.396987%
This Master of Engineering Thesis describes the design, implementation, and usage of the TIOA Simulator. The TIOA Simulator, along with the other components of the TIOA Toolset aims to provide a framework for developing dependable distributed systems. The project is based on the Timed Input/Output Automaton framework, and supports TIOA, a formal language for specifying timed I/O automata. Simulation of TIOA programs is useful in the process of testing the proposed system over a specific set of executions. During the execution the Simulator is able to test proposed invariants and validate a proposed simulation relation between the system's implementation and its specification. A step correspondence between the steps of the implementation and the specification drives the validation of the simulation relation. The identification and validation of the invariants and the simulation relation constitutes the first step towards a formal verification of the system's correctness. The proposed step correspondence can be used in a formal proof to show that the proposed relation is indeed a simulation relation.; by Panayiotis P. Mavrommatis.; Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science...

‣ Simulation of optical remote-sensing systems for earth resource analysis

Kerekes, John; Landgrebe, David
Fonte: Institute of Electrical and Electronics Engineers (IEEE) Publicador: Institute of Electrical and Electronics Engineers (IEEE)
Tipo: Proceedings Formato: 265238 bytes; application/pdf
Português
Relevância na Pesquisa
47.18449%
A system model for the simulation of remote sensing systems is presented. The system is seen to be divided into three parts: the scene, the sensor, and the processing algorithms. Models are presented for these various component systems. Results of the simulation for various scene and sensor configurations are included.; "Simulation of optical remote-sensing systems for earth resource analysis," Proceedings of the IEEE International Geoscience and Remote Sensing Symposium. Institute of Electrical and Electronics Engineers (IEEE). Held in Edinburgh, Scotland: 13-16 September 1988. ©1988 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.; The work reported in this paper was funded in part by NSF Grant ECS 8507405.

‣ Analysis of the Performance of the Pressurized-Water Nuclear Reactor by Electrical Simulation - Analog Computer

Bartells, Philip
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
Português
Relevância na Pesquisa
57.18449%
This thesis demonstrates a method of analog simulation of a Pressurized-Water Reactor (PWR) using simplified techniques. The simulation is for the reactor vessel and is patterned after the "Yankee," the PWR owned and operated by the Yankee Atomic Electric Company of Rowe, Massachusetts, and built by the Westinghouse Corporation of Pittsburgh, Pennsylvania. The entire analysis is based on the one group model (postulated that neutrons in the reactor are of one energy). The areas analyzed are: 1. Reactor kinetics - one delay group 2. Temperature effects on reactivity A. Fuel temperature coefficient B. Moderator and coolant temperature coefficient. 3. Control rod servo system The results of the program demonstrate that an effective simulation is possible using greatly simplified equations.

‣ A methodology for simulation of hybrid Single-electron/MOS transistor circuits

Sarmiento-Reyes,A.; Castro González,F. J.; Hernández-Martínez,L.
Fonte: Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. Publicador: Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C.
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2013 Português
Relevância na Pesquisa
47.18449%
On one side, the steady downscaling that CMOS technology has experienced in the last four decades has brought it near its fundamental limits due to the appearance of quantum effects which were not previously taken into account. On the other side, - and even though the current problems involved in their fabrication, nanoelectronic devices such as the Single- Electron Transistors (SET) are devised as future basic cell in the development of electronic systems. It clearly results that in forthcoming years, mature nanometric CMOS devices will share scenario with single-electron devices and other nano-devices in a wide number of applications, yielding hybrid electronic systems. Therefore, it becomes imperative to develop design verification methods and tools specially suited for these hybrid systems. In this paper, we present a simulation methodology for the electrical simulation of hybrid SET/MOS IC designs. The methodology results in a piecewise linear representation of the static SET characteristic that can be easily combined with existing MOS models in a standard industry package for electrical simulation such a SPICE.