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COMPUTER EMULATORS AND SIMULATORS OFMEASURING INSTRUMENTS ON THE PHYSICS LESSONS КОМП’ЮТЕРН ЕМУЛЯТОРИ ТА СИМУЛЯТОРИ ВИМ РЮВАЛЬНИХ ПРИЛАД В НА ЗАНЯТТЯХ З Ф ЗИКИ  [cached]
Я.Ю. Дима
Information Technologies and Learning Tools , 2010,
Abstract: Prominent feature of educational physical experiment at the present stage is applications of computer equipment and special software – virtual measuring instruments. The purpose of this article – to explain, when by means of virtual instruments it is possible to lead real experience (they are emulators), and when – virtual (they are simulators). For the best understanding implementation of one laboratory experimentation with usage of the software of both types is given. As at learning physics advantage should be given to carrying out of natural experiment with learning the real phenomena and measuring of real physical quantities the most perspective examination of programs-emulators of measuring instruments for their further implantation in educational process sees. Характерною рисою навчального ф зичного експерименту на сучасному етап застосування комп’ютерно техн ки та спец альних програмних засоб в — в ртуальних вим рювальних прилад в. Мета статт — роз’яснити, коли за допомогою в ртуальних прилад в можна провести реальний досл д (вони емуляторами), а коли — в ртуальний (вони симуляторами). Для кращого розум ння наводиться реал зац я одн лабораторно роботи з використанням програмного забезпечення обох тип в. Оск льки п д час вивчення ф зики перевага ма надаватися проведенню натурного експерименту з вивченням реальних явищ та вим рюванням реальних ф зичних величин, то найб льш перспективним вбача ться досл дження програм-емулятор в вим рювальних прилад в для х подальшого впровадження у навчальний процес.
Calibration of Complex Computer Simulators using Likelihood Emulation  [PDF]
Jeremy E. Oakley,Benjamin D. Youngman
Statistics , 2014,
Abstract: We calibrate a Natural History Model, which is a class of computer simulator used in the health industry, and here has been used to characterise bowel cancer incidence for the UK. The simulator tracks the development of bowel cancer in a sample of people, and its output mostly stratifies bowel cancer occurrence by patient age and bowel cancer type. Its output relies on 25 unknown inputs, which we are required to calibrate. In order to do this we must address that not only is the output count data, but it is also stochastic, due to the simulation procedure. We cannot feasibly achieve calibration of the simulator using Monte Carlo methods alone, as it is of `moderate' computational expense. To achieve a reliable calibration, we must also specify its discrepancy: how, when calibrated, it differs from reality. We propose a method for calibration that combines a statistical emulator for the likelihood function with importance sampling. The emulator provides an interim sample of inputs at which the simulator is run, from which the likelihood is calculated. Importance sampling is then used to re-weight the inputs and provide a final sample of calibrated inputs. Re-calculating the importance weights incurs little computational cost, and so we can easily investigate how different discrepancy specifications affect calibration.
SECURITY ISSUES IN COMPUTER NETWORK ARCHITECTURE
Dr. M. Lilly Florence
Journal of Global Research in Computer Science , 2011,
Abstract: The architecture of a computer network has evolved with advances in technology. The design of secure computer network architecture to protect the integrity of information exchange is pursued by the commercial and financial sectors and at all levels of government agencies. Active networks represent a new approach to network architecture. It provides a much more flexible network infrastructure. The network security is mainly based on the network architecture. The purpose of this paper is to provide a broad survey on security in network system architecture. The first goal is to discuss various network architecture. The second goal is to highlight security issues in network architecture. Thus an inclusive presentation of network architecture, security issues is given. Keywords: Peer – to – Peer Network, Client – Server Model, Network Security, authentication, NCSC.
SECURITY ISSUES IN COMPUTER NETWORK ARCHITECTURE
Dr. M. Lilly Florence
Journal of Global Research in Computer Science , 2011,
Abstract: The architecture of a computer network has evolved with advances in technology. The design of secure computer network architecture to protect the integrity of information exchange is pursued by the commercial and financial sectors and at all levels of government agencies. Active networks represent a new approach to network architecture. It provides a much more flexible network infrastructure. The network security is mainly based on the network architecture. The purpose of this paper is to provide a broad survey on security in network system architecture. The first goal is to discuss various network architecture. The second goal is to highlight security issues in network architecture. Thus an inclusive presentation of network architecture, security issues is given. Keywords- Peer – to – Peer Network, Client – Server Model, Network Security, authentication, NCSC.
LSE: A Development Tool for Computer Architecture Simulator
LSE:一种处理器体系结构软件仿真器开发工具

YU Zhi-Bin,Jin-Hai,
喻之斌
,金海

计算机科学 , 2008,
Abstract: Software simulation is one of the most important aspects in modern processor architecture design,which is used to verify design results.However,it is very difficult to develop a processor architecture simulator.Three factors contribute to this difficulty.Firstly,the programming languages such as C or C used for developing processor architecture simulators are sequential while the components of a processor can run concurrently.The procedure mapping the sequential program to concurrently running components is time-consuming,difficult and error prone.Secondly,the simulation speed of simulators which are developed by sequential programming languages is very low and this is the bottle neck in processor architecture simulation field.Lastly,the high error ratio of the results of a simulator is also a key issue.In this paper,we firstly introduced a new development tool for computer architecture simulators.Then,the advantages and disadvantages of this tool are deeply analyzed.In the end,we come up with a proposal to ameliorate the development tool.
Prediction and Computer Model Calibration Using Outputs From Multi-fidelity Simulators  [PDF]
Joslin Goh,Derek Bingham,James Paul Holloway,Michael J. Grosskopf,Carolyn C. Kuranz,Erica Rutter
Statistics , 2012,
Abstract: Computer codes are widely used to describe physical processes in lieu of physical observations. In some cases, more than one computer simulator, each with different degrees of fidelity, can be used to explore the physical system. In this work, we combine field observations and model runs from deterministic multi-fidelity computer simulators to build a predictive model for the real process. The resulting model can be used to perform sensitivity analysis for the system, solve inverse problems and make predictions. Our approach is Bayesian and will be illustrated through a simple example, as well as a real application in predictive science at the Center for Radiative Shock Hydrodynamics at the University of Michigan.
Time-Predictable Computer Architecture  [cached]
Schoeberl Martin
EURASIP Journal on Embedded Systems , 2009,
Abstract: Today's general-purpose processors are optimized for maximum throughput. Real-time systems need a processor with both a reasonable and a known worst-case execution time (WCET). Features such as pipelines with instruction dependencies, caches, branch prediction, and out-of-order execution complicate WCET analysis and lead to very conservative estimates. In this paper, we evaluate the issues of current architectures with respect to WCET analysis. Then, we propose solutions for a time-predictable computer architecture. The proposed architecture is evaluated with implementation of some features in a Java processor. The resulting processor is a good target for WCET analysis and still performs well in the average case.
The Application of Visual Organization Principle in the Detection of Sleep Spindles  [PDF]
Xuemei Jin, Junzhong Zou, Jian Zhang
Journal of Biomedical Science and Engineering (JBiSE) , 2017, DOI: 10.4236/jbise.2017.105B001
Abstract:
In order to detect the sleep spindles simply and efficiently, a novel time-domain approach to detect sleep spindles based on the principles of visual organization is proposed. The code idea of the visual organization is to organize the primary visual elements according to some rules of organization, and to form a more meaningful object of visual processing, as the input of next process. After the collected EEG is processed with the merging algorithm based on the principle of visual organization, it can extract the time-domain feature frequency and duration time better. Use these features with a simple algorithm to detect spindles achieving sensitivity of 92.5% and specificity of 98.1%, which verifies the validity of this method to detect the sleep spindles.
Multivariate emulation of computer simulators: model selection and diagnostics with application to a humanitarian relief model  [PDF]
Antony Overstall,David Woods
Statistics , 2015,
Abstract: We present a common framework for Bayesian emulation methodologies for multivariate-output simulators, or computer models, that employ either parametric linear models or nonparametric Gaussian processes. Novel diagnostics suitable for multivariate covariance-separable emulators are developed and techniques to improve the adequacy of an emulator are discussed and implemented. A variety of emulators are compared for a humanitarian relief simulator, modelling aid missions to Sicily after a volcanic eruption and earthquake, and a sensitivity analysis is conducted to determine the sensitivity of the simulator output to changes in the input variables. The results from parametric and nonparametric emulators are compared in terms of prediction accuracy, uncertainty quantification and scientific interpretability.
Quantum computer of wire circuit architecture  [PDF]
S. A. Moiseev,F. F. Gubaidullin,S. N. Andrianov
Physics , 2010,
Abstract: First solid state quantum computer was built using transmons (cooper pair boxes). The operation of the computer is limited because of using a number of the rigit cooper boxes working with fixed frequency at temperatures of superconducting material. Here, we propose a novel architecture of quantum computer based on a flexible wire circuit of many coupled quantum nodes containing controlled atomic (molecular) ensembles. We demonstrate wide opportunities of the proposed computer. Firstly, we reveal a perfect storage of external photon qubits to multi-mode quantum memory node and demonstrate a reversible exchange of the qubits between any arbitrary nodes. We found optimal parameters of atoms in the circuit and self quantum modes for quantum processing. The predicted perfect storage has been observed experimentally for microwave radiation on the lithium phthalocyaninate molecule ensemble. Then also, for the first time we show a realization of the efficient basic two-qubit gate with direct coupling of two arbitrary nodes by using appropriate atomic frequency shifts in the circuit nodes. Proposed two-qubit gate runs with a speed drastically accelerated proportionally to the number of atoms in the node. The direct coupling and accelerated two-qubit gate can be realized for large number of the circuit nodes. Finally, we describe two and three-dimensional scalable architectures that pave the road to construction of universal multi-qubit quantum computer operating at room temperatures.
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