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Search Results: 1 - 10 of 10929 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.

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.

Bronchoscopy Simulation in Anesthesia Resident Education  [PDF]
John McNeil,John Pawlowski
Open Journal of Anesthesiology (OJAnes) , 2013, DOI: 10.4236/ojanes.2013.33041
Abstract: Simulation in residency training is becoming more popular but there is limited evidence showing that it can improve a resident’s fund of knowledge, particularly in anesthesiology. We looked at whether a bronchoscopy simulation could improve performance on a thoracic anesthesia knowledge test administered both before and after using the simulator. Fourteen first-year anesthesiology residents completed the study with an average improvement on the test of 28% (p < 0.05). We conclude that bronchoscopy simulation is an effective method of educating anesthesiology residents.
Developments in Simulation Bronchoscopy Training  [PDF]
Jack A. Kastelik, Faiza Chowdhury, Sega Pathmanathan, Imran Aslam, Joseph Hogg, Jaymin B. Morjaria
Open Journal of Respiratory Diseases (OJRD) , 2013, DOI: 10.4236/ojrd.2013.34024
Abstract: Flexible bronchoscopy is a common procedure. Training in bronchoscopy is a complex process involving learning technical skills, understanding indications and contraindications, risks and benefits of the procedure, working within the team and communicating with patients. It is expected that a competent bronchoscopist is able to maneuver the scope through the anatomically complex bronchial tree, take samples, manage the sedated patient and communicate with nursing staff. Learning the complex procedural skills in the clinical setting can be stressful, therefore current bronchoscopic training methodology should blend a number of learning methods including didactic lectures, web-based material, high and low fidelity simulators as well as supervised apprenticeship training. Simulation-based bronchoscopy training therefore has been explored as a mode of training bronchoscopy skills. In this article, the role of simulation-based bronchoscopy training is reviewed. The low fidelity and high fidelity virtual reality bronchoscopy models are described together with the evidence available to support the use of simulation for bronchoscopy training.
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