The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The requirement to verify the causality of electromagnetic model response and ensure validity of transient simulations results is gaining momentum for those skilled in the art. In order to capture causal models and verify causal behavior, the engineer must understand which parameters have an impact on model behavior as well as those parameters which inhibit lab verification of said model. Specifically,...
Band-to-band tunneling (BTBT) determines the on-current in tunnel FETs (TFETs). There is a need to review and recalibrate BTBT models used in TCAD tools, which were developed when BTBT was essentially a leakage phenomenon. Here, we consider the process of BTBT through staggered heterojunctions which find application in the design of TFETs having high on-currents. We use a simple 1-D system and compare...
The optimum operating temperature of a Polymer Electrolyte Membrane (PEM) fuel cell is approximately 80°C. The electrochemical reaction inside a PEM fuel cell stack produces approximately 50% of electrical and 50% of heat energy. The power output of the fuel cell stack is significantly influenced by the humidity and temperature inside the power stack. Therefore, an effective cooling system is necessary...
Este artigo busca averiguar o uso dos conceitos de Engenharia de Serviço na indústria naval brasileira, contextualizado no cenário de crescimento que este setor se encontra atualmente. Com uma abordagem utilizando Sistemas de Produto-Serviço, cada vez mais aplicados em outras áreas da indústria, o conceito de Internet das Coisas, que permite transparência e dados em tempo real, e o middleware H-Env,...
Learning guidance after class is an important activity in elementary school because it can help the students to improve their learning achievement. Traditional learning guidance is, however, tedious and unstructured due to its complexity and the burden on teachers. The purpose of this study is to propose a model of two-stage mobile learning guidance based on use of mobile computer devices and a cognition...
This paper describes the concepts of architecture of modern systems for e-learning based on semantic technologies with the aspects of adaptation, personalization and dynamic adaptability of learning material. The proposed architecture is able to generate the student's profile based on basic and historical data on the student which ensures the personalization of the system. The personalized student...
In this paper a method is presented for mapping the simulation state between models of different level of detail in dynamic multiresolution modeling of discrete event material flow systems. In dynamic multiresolution modeling it is possible to inactivate a model part of certain detail and activate a model of higher or lower detail representing the same part of the system during simulation. To allow...
High quality e-learning resources are expensive to produce. The “learning object” is an emerged instructional technology to promote the reusability of high quality learning resources. This paper presents an exploratory study of the learning objects designed to support computer science teaching and learning. The aim of the exploratory study is to get insight into the characteristics of computer science...
A simulation model is intended to capture a real-world system. Consequently, the modeling language used for making the simulation model should have a “real-world semantics” guaranteeing some kind of ontological faithfulness for the models made with it. In this paper, we propose to use ABDESO, a foundational ontology for agent-based discrete event simulation, for evaluating agent-based simulation languages.
Hysteresis is a phenomenon encountered in a lot of scientific domains. This paper presents a representation of hysteresis modeling using Preisach algorithm, starting from minimal measured data. Numerical results show a good agreement between theoretical and represented data. Measured data is done for a metro card in case of a transversal and in case of a longitudinal applied field. Presented results...
The design process falls into the problem-solving method in which it involves an intensive way of searching and matching that generates a large solution space. In that sense and inspired on the Kryssanov's design model, this paper introduces a novel design model based on genetic algorithms that aims to achieve an optimal solution taking into account the design objectives, the conceptual design, the...
A new complete software tool for modeling EDXRD, called SinFullScat and based on the existing simulator Sindbad has been developed in order to simulate diffracted spectra for any configurations. It enables to study the effects of all diffractometer's parameters on the output spectra. Depending on the application, inspected materials may have different structures, either amorphous (e.g. explosive liquids...
This paper explores the question that gasoline-final boiling point can not be real time measured online which is one of major indicators of gasoline quality in petroleum refining process. It gives the theory and the method setting up dynamically the models of gasoline-final boiling point online. Combine the optimizing technique of the parameter identification and the dynamic search. Realize computer...
This work presents a finite-difference time-domain (FDTD) propagator comprising a moving window algorithm and a material independent (MI) perfectly matched layer (PML) formulation. The FDTD provides a full-wave electromagnetic calculation and a large frequency range application. The FDTD mesh is constructed only in the virtual window, saving memory and computation effort. The MI-PML formulation can...
This paper considers the problem of n-player conflict modeling, arising due to competition over resources. Each player represents a distinct group of people and has some resource and power. A player may either attack other players(i.e., groups) to obtain their resources or do nothing. We present a game-theoretical model for interaction between the players, and show that key questions of interest to...
The popularity of modern information technology makes it urgent to construct a new English teaching model based on the integration of technology and teaching. Such integration targets at improving the traditional teaching mode, representing a trend in the curriculum reform home and abroad. This paper aims at information technology and college English teaching integration, analyzing the importance...
When one-dimensional single atom chain was placed at the center of single wall carbon nano-tube (SWCNT) along the axis, and using the molecular dynamics simulation, the mechanical strength of a single-walled could be obtained in terms of the stress-strain curve. At this temperature of 0K, the ultimate stress of a SWCNT with one-dimensional single atom chain was higher than that of a SWCNT without...
The constitutive parameters of a Teflon sample of arbitrary thickness are retrieved from scattering parameters experimentally measured with a vector network analyzer and a waveguide system into which the test sample is inserted by filling the transverse section of the X-band waveguide. Based on the Nicolson-Ross-Weir (NRW) method and modified to eliminate the phase ambiguity inherent to the NRW procedure,...
Cutting stock is concerned with how to saving material, optimize resources in product designing, manufacturing. It is very complicated and difficult in computing theory, but it has got the extensive application in the actual manufacture. In this paper, genetic algorithm optimization of two-dimensional sheet metal nesting design, genetic algorithm is a numerical method for global optimization. Compared...
Monte Carlo treatment planning techniques provide a very accurate dose calculation compared to ‘conventional’ deterministic treatment planning systems. In the present work, the irradiation of the RANDO phantom with an Elekta Precise MultiLeaf Collimated rhombus-shaped photon beam is validated throughout the comparison of dose maps calculated with PLanUNC (PLUNC), a set of software tools for radiotherapy...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.