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Search Results: 1 - 10 of 11715 matches for " Simulation "
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Simulation on Single Server & Distributed Environment (It’s Comparison & Issues)  [PDF]
A. Jawwad Memon, Wasi Ur Rehman
World Journal of Engineering and Technology (WJET) , 2013, DOI: 10.4236/wjet.2013.12004

Simulation has become the evaluation method of choice for many areas of distributing computing research. Simulation has been applied successfully for modeling small and large complex systems and understanding their behavior, especially in the area of distributed systems or parallel environment. The aim of my research is to study and qualitative analysis of simulation on a single server & on distributed environment and finding the related issues & its comparison.

Introducing Simulation Based Learning Activities to Physiotherapy Course Curricula  [PDF]
Diane M. Dennis, David A. Sainsbury, Tracy M. Redwood, Leo Ng, Anne Furness
Creative Education (CE) , 2016, DOI: 10.4236/ce.2016.76092
Abstract: Background: Whilst relatively new in physiotherapy, simulation has been used in various medical and nursing programs to develop manual and communication skills and clinical reasoning. The primary aim of this study was to develop and introduce simulation activities into the physiotherapy curricula at an Australian University and evaluate students’ motivation to learn. The secondary aim was to evaluate differences in perceived value between first and second year students. Methods: During 2014, first and second year physiotherapy students at Curtin University, Western Australia enrolled in three units had the opportunity to participate in newly developed simulated scenarios as part of their program. On completion of these novel learning activities, students were invited to undertake the Instructional Materials Motivation Scale (IMMS) questionnaire. Results: Total IMMS scores for the three units (147, 137 and 156) indicated that overall, students found the simulation based learning activities motivating. First year students found that simulation gained their attention and was more enjoyable than second year students. Conclusions: As motivation entices people to learn and to complete activities, there may be great potential for improved learning outcomes using this modality in physiotherapy curricula, especially in the first year of the program.
A Guide to Population Modelling for Simulation  [PDF]
Leif Gustafsson, Mikael Sternad
Open Journal of Modelling and Simulation (OJMSi) , 2016, DOI: 10.4236/ojmsi.2016.42007
Abstract: This paper outlines the fundamentals of a consistent theory of numerical modelling of a population system under study. The focus is on the systematic work to construct an executable simulation model. There are six fundamental choices of model category and model constituents to make. These choices have a profound impact on how the model is structured, what can be studied, possible introduction of bias, lucidity and comprehensibility, size, expandability, performance of the model, required information about the system studied and its range of validity. The first choice concerns a discrete versus a continuous description of the population system under study—a choice that leads to different model categories. The second choice is the model representation (based on agents, entities, compartments or situations) used to describe the properties and behaviours of the objects in the studied population. Third, incomplete information about structure, transitions, signals, initial conditions or parameter values in the system under study must be addressed by alternative structures and statistical means. Fourth, the purpose of the study must be explicitly formulated in terms of the quantities used in the model. Fifth, irrespective of the choice of representation, there are three possible types of time handling: Event Scheduling, Time Slicing or Micro Time Slicing. Sixth, start and termination criteria for the simulation must be stated. The termination can be at a fixed end time or determined by a logical condition. Population models can thereby be classified within a unified framework, and population models of one type can be translated into another type in a consistent way. Understanding the pros and cons for different choices of model category, representation, time handling etc. will help the modeller to select the most appropriate type of model for a given purpose and population system under study. By understanding the rules for consistent population modelling, an appropriate model can be created in a systematic way and a number of pitfalls can be avoided.
Experimental Analysis of UWB Signal Performance in a Constrained Environment for Railway Application  [PDF]
Ouafae Cohin, Sara Ibenjellal, Fouzia Boukour, Sylvie Baranowski
Wireless Engineering and Technology (WET) , 2015, DOI: 10.4236/wet.2015.64008
Abstract: In the railway application, in order to establish the communication between wagons, some technologies are proposed such as the ZigBee and HTN (Hybrid Networking Technology). However, these techniques have some limitations such as: the low data rate, non-secured transmission and interferences. The Ultra Wide Band (UWB) technology presents a good alternative and a good candidate for this application. In recent years, UWB communication systems have received significant attention from both the industry and the academia. In February 2002, the Federal Communications Commission (FCC) allocated 7500 MHz of spectrum (from 3.1 GHz to 10.6 GHz) for use by UWB devices. This ruling has helped to create new standardization efforts, like IEEE 802.15.3a, which focus on developing high speed wireless communication systems. The application of the UWB radio technique in the transport is a more recent topic that is thoroughly researched considering several factors including the nature of the transport propagation environment; the use of adequate transmitting/receiving duty cycle (LDC); the number of devices using UWB technology, the types and levels of interferences. Regulation bodies have considered these railway applications. Impulse Radio Ultra Wideband (IR-UWB) systems have been studied for their inherent advantages of coexistence with narrowband systems with high data rate over short distances with sufficiently small amount of transmitted power. The UWB systems are highly susceptible to interference between the coexisting narrowband systems because of very low transmission power. This paper considers the use of the UWB radio technology for railway application. In this paper, we evaluate the communication performance in constrained environment for the railway application.
Grounded and Floating Inductance Simulation Circuits Using VDTAs  [PDF]
Dinesh Prasad, D. R. Bhaskar
Circuits and Systems (CS) , 2012, DOI: 10.4236/cs.2012.34048
Abstract: New electronically-controllable lossless grounded and floating inductance simulation circuits have been proposed employing Voltage Differencing Transconductance Amplifiers (VDTA). The proposed grounded inductance (GI) circuit employs a single VDTA and one grounded capacitor whereas the floating inductance (FI) circuit employs two VDTAs and one grounded capacitor. The workability of the new circuits has been verified using SPICE simulation with TSMC CMOS 0.18 μm process parameters.
Research and Design of UUV Navigation and Control Integrative Simulation System Based on Component  [PDF]
Shengjie Wang, Fengju Kang
Intelligent Information Management (IIM) , 2012, DOI: 10.4236/iim.2012.45027
Abstract: This paper uses the component-based technology and the object oriented simulation technology to analyze the UUV navigation and control integration simulation system. We divide the system into components based on its structure, and describe every component using active diagram. By using the component-based technology, the system described here is easier to extended and be reused. At last, it realizes the whole UUV integrated navigation simulation course using the system to validate the availability.
Investigation of Effects of Large Dielectric Constants on Triaxial Induction Logs  [PDF]
Zhijuan Zhang, Boyuan Yu, Ce Liu
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.331246
Abstract: The dielectric effect is receiving increasing interest in the study of resistivity logging. Several recent findings have proven that the dielectric effect can cause negative imaginary signals on the array induction logging. However, very few researches discuss the dielectric effect on the triaxial induction logging which is a novel technology in solving anisotropy problem. In this paper, we investigate the effect of large dielectric constants on a basic triaxial induction tool in a 1-D homogenous earth formation. The simulation model is derived from Maxwell equation and calculated by wave number integration. Sufficient simulations have been done. We performed an asymptotic analysis of the dielectric effect within the low-freq limit, yielding interesting observations on the dielectric effect with respect to frequency, spacing, and anisotropy. Those findings provide important and useful guidance for researchers to study on the dielectric effect on the triaxial induction logging.
Simulation and Experimental Study on the Atomization Character of the Pressure-Swirl Nozzle  [PDF]
Jianbo Zhao, Lijun Yang
Open Journal of Fluid Dynamics (OJFD) , 2012, DOI: 10.4236/ojfd.2012.24A032
Abstract: In this paper the atomization character of the pressure-swirl injector was measured by using the Phase Doppler Particle Analyzer (PDPA) in the section of 150 mm below the outlet of the orifice. The orifice diameter of the pressure-swirl injector is 0.62 mm. The atomization character includes the spray angle, the water flow rate, the Sauter mean diameter (SMD), the velocity of the particles and their distribution in the radial and the axial directions under the pressure from 1 MPa to 4.5 MPa. After that the atomization character of the pressure-swirl injector was simulated in the DPM panel. The same atomization character of the injector was calculated and compared with the experimental data. The simulation was corrected by using the experimental data which can make it accurately and the model can be used to predict and calculate the atomization character of different injectors.
Evaluation of participants' feedback after a simulation-based training in neonatal resuscitation using a realistic delivery room  [PDF]
Alejandro Avila-Alvarez, Iria Gonzalez-Rivera, Jose L. Fernandez-Trisac, Maria I. Taboada-Perianes, Bruno Rodriguez-Gonzalez, Alberto Centeno-Cortes, Maria Diaz-Gomez, Teresa Rei-Serra, Rita Jacome-Feijoo
Open Journal of Pediatrics (OJPed) , 2012, DOI: 10.4236/ojped.2012.24047
Abstract: BACKGROUND: Low-frequency and high-risk situations, such as neonatal resuscitation, are the ideal targets for simulation-based learning. The aim of this paper is to present the structure of our internal neonatal resuscitation training program, using a realistic, simulated delivery room, and to present the participants' opinions about teamwork, emotional stress, and their subjective ability to face a resuscitation. METHODS: We administered a training course to 24 doctors and midwives. One of the simulation classrooms was modified to appear similar to a real delivery room. Four scenarios were conducted using a previously designed checklist of primary and secondary goals. Upon completion, all students participated in a debriefing session with the help of a video review. RESULTS: Students rated the achievement of their previously defined goals on a scale of 1 to 5. Grouping together the percentages of the highest ratings (Categories 4 and 5), 83.4% (20/24) of the students considered the course useful for acquiring clinical skills. For 87.5% (21/24) of the students, the scenarios simulated real clinical situations, the room properly simulated a real delivery room, and the course improved the students' ability to work in a team. For 66.6% (16/24) of the students, the course improved their stress in confronting neonatal resuscitation. Initially, only 33.3% (8/24) of the students considered themselves very capable or fully able to cope with a resuscitation. After the course, that percentage rose to 62.5% (15/24). CONCLUSIONS: The incorporation of simulation-based learning into neonatal resuscitation teaching programs, using realistic scenarios, is useful and offers the possibility of acquiring technical skills, but it also allows for the improvement of teamwork and the adoption of different roles and positive attitudes towards emotional stress.
The hemodynamic study for growth factor evaluation of rupture cerebral aneurysm followed up for five years  [PDF]
Masahiro Kojima, Keiko Irie, Seiichi Ikeda, Toshio Fukuda, Fumihito Arai, Yuichi Hirose, Makoto Negoro
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.512A112

Computer-based simulations are essential for clarifying the hemodynamics of brain aneurysms. Since cerebrovascular disease is often fatal, it is strongly desirable to predict its progression. While previous studies have clarified the initiation mechanism of aneurysms, their growth mechanism remains unclear. Consequently, it is difficult to develop a diagnostic system for predicting aneurysm rupture. This study seeks to clarify the mechanism of aneurysm growth by identifying significant hydrodynamic factors. We focus on a single ruptured aneurysm that was followed up for five years. Computer simulations and fluid dynamic experiments with silicone vessel models were performed. To confirm the reliability of data in the computer simulations, we conducted particle image velocimetry measurements in steady flow. We then performed computer simulations for pulsatile conditions to determine an effective index for aneurysm growth. We obtained good agreement between the trends in the obtained computer simulation and experimental data. Numerical simulations for pulsatile flow in three models revealed that aneurysms grew in regions having a low wall shear stress, a low aneurysm formation indicator, and a high oscillatory shear index.

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