Simulation algorithms are synthesized for modeling input signals of information processing systems based on empirical data presented as histograms. Simulation algorithms, being statistical equivalents of input signals...
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ISBN:
(数字)9781728149448
ISBN:
(纸本)9781728149455
Simulation algorithms are synthesized for modeling input signals of information processing systems based on empirical data presented as histograms. Simulation algorithms, being statistical equivalents of input signals of technical systems, do not contradict the data of experimental studies, which allows them to be used to determine the characteristics of the designed systems using mathematical modeling methods on a computer for an arbitrary amount of statistical tests.
A new molecular modeling algorithm for conducting large-scale molecular dynamics simulation studies of cross-linked phenolic resins is developed using a united-atom model. A phenol-formaldehyde polycondensation system...
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A new molecular modeling algorithm for conducting large-scale molecular dynamics simulation studies of cross-linked phenolic resins is developed using a united-atom model. A phenol-formaldehyde polycondensation system is simulated by a pseudoreaction algorithm taking into consideration (i) the difference in the experimental reaction rate constants at ortho and para positions of phenolic units and (ii) the geometry of the reactants. To avoid formation of locally strained cross-linked structures that can be generated in a typical cutoff-distance-based reaction scheme, a geometrical judgment constraint is applied in the reaction procedure. With this algorithm, cross-linked network structures of phenolic resins with a maximum conversion () of 0.90 are obtained from 10 000 phenols. The density and the tensile modulus of the structure with of 0.90 at 300 K are 1.2 g cm(-3) and 5.4 GPa, respectively. This is in good agreement with experimental values. The strain-free, highly cross-linked network structures of phenolic resins exhibit a higher density and tensile modulus compared with structures generated in the absence of the geometrical cutoff. This result demonstrates that the geometrical judgment constraint can effectively avoid the formation of distorted and strained local structures and is necessary for accurate modeling of highly cross-linked phenolic resins.
For proton linear accelerators used in applications such as accelerator-driven systems, due to the nature of the operation, it is essential for the beam failure rate to be several orders of magnitude lower than usual ...
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For proton linear accelerators used in applications such as accelerator-driven systems, due to the nature of the operation, it is essential for the beam failure rate to be several orders of magnitude lower than usual performance of similar accelerators. A fault-tolerant mechanism should be mandatorily imposed in order to maintain short recovery time, high uptime and extremely low frequency of beam loss. This paper proposes an innovative and challenging way for compensation and rematch of cavity failure using fast electronic devices and Field Programmable Gate Arrays （FPGAs） instead of embedded computers to complete the computation of beam dynamics. A method of building an equivalent model for the FPGA, with optimization using a genetic algorithm, is shown. Results based on the model and algorithm are compared with TRACEWIN simulation to show the precision and correctness of the mechanism.
In the study, four different semiempirical algorithms, modified neglect of diatomic overlap, a reparameterization of Austin Model 1, complete neglect of differential overlap and typed neglect of differential overlap, ...
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In the study, four different semiempirical algorithms, modified neglect of diatomic overlap, a reparameterization of Austin Model 1, complete neglect of differential overlap and typed neglect of differential overlap, have been applied for the energy optimization of template, monomer, and template-monomer complexes of imprinted polymers. For phosmet-, estrone-, and metolcarb-imprinted polymers, the binding energies of template-monomer complexes were calculated and the docking configures were assessed in different molar ratio of template/monomer. It was found that two algorithms were not suitable for calculating the binding energy in template-monomers complex system. For the other algorithms, the obtained optimum molar ratio of template and monomers were consistent with the experimental results. Therefore, two algorithms have been selected and applied for the preparation of enrofloxacin-imprinted polymers. Meanwhile using a different molar ratio of template and monomer, we prepared imprinted polymers and nonimprinted polymers, and evaluated the adsorption to template. It was verified that the experimental results were in good agreement with the modeling results. As a result, the semiempirical algorithm had certain feasibility in designing the preparation of imprinted polymers.
At present, large enterprises have a lot of branches, Although the IT system can be in the form of centralized data center, but the business sector and branch structure itself cannot centralized like IT. Therefore thr...
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ISBN:
(纸本)9781479919840
At present, large enterprises have a lot of branches, Although the IT system can be in the form of centralized data center, but the business sector and branch structure itself cannot centralized like IT. Therefore through standardized ITIL processes to achieve centralized management of IT infrastructure opaque organization. But the process appeared on the "performance" of the problem regarding the evaluation of non-uniform standards, leading IT service efficiency optimization bottleneck. For this issue, this paper studies the current IT performance indicators and analyze cause of the problem, and then use statistical data, designed to quantify the performance of an innovative assessment model based on distributed IT management framework. Finally, check the massive performance data through the assessment model, using simulation to fully verify the feasibility of the model.
学位级别： Ph.D., Doctor of Philosophy, Ph.D./Interdisciplinary
Optical wireless communications (OWC) is an important research area that promises to mitigate some problems currently existing in radio frequency based systems, such as shortage of radio frequency spectrum, interferen...
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Optical wireless communications (OWC) is an important research area that promises to mitigate some problems currently existing in radio frequency based systems, such as shortage of radio frequency spectrum, interference and necessity of transmission at very high data rates. Optical wireless communications can be both indoors and outdoors. The focus of this dissertation is on indoor optical wireless communication channels and systems. Indoor optical wireless channels pose some challenges to properly model and analyze propagation characteristics. Since light signals reflect from wall surfaces, receivers in an OWC system usually receive many reflections of the transmitted signals. This results in inter-symbol-interference (ISI) that has detrimental effects to the achievable performance of the system. Hence, it is necessary to understand reflection patterns and consequences of multiple bounces of light signals from reflecting surfaces by properly analyzing the channel impulse response. In this dissertation, methods of simulating indoor optical wireless channel impulse responses are discussed and an algorithm is elaborated that have been developed by combining two existing popular algorithms, namely Barry’s algorithm and Modified Monte Carlo method, thereby carrying the best features of both. Channel parameters that affect high speed data transmission such as rms delay spread is an important topic that has been discussed in details in this dissertation. Channel impulse responses of several channel conditions are simulated and associated rms delay spreads are found, thereby relating the results to the locations of the receiver and the source. Every data transfer communication system has to be duplex, i.e. requires both a downlink as well as an uplink channel. Hence, for establishing a high-speed communication system we have proposed a design of a duplex optical wireless system in this dissertation. Some considerations related to cost efficiency at the user side have been
The main source of information in most adaptive hypermedia systems are server monitored events such as page visits and link selections. One drawback of this approach is that pages are treated as "monolithic"...
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ISBN:
(纸本)9783642223617
The main source of information in most adaptive hypermedia systems are server monitored events such as page visits and link selections. One drawback of this approach is that pages are treated as "monolithic" entities, since the system cannot determine what portions may have drawn the user's attention. Departing from this model, the work described here demonstrates that client-side monitoring and interpretation of users' interactive behavior (such as mouse moves, clicks and scrolling) allows for detailed and significantly accurate predictions on what sections of a page have been looked at. More specifically, this paper provides a detailed description of an algorithm developed to predict which paragraphs of text in a hypertext document have been read, and to which extent. It also describes the user study, involving eye-tracking for baseline comparison, that served as the basis for the algorithm.
The main source of information in most adaptive hypermedia systems are server monitored events such as page visits and link selections. One drawback of this approach is that pages are treated as "monolithic"...
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ISBN:
(纸本)9783642223617
The main source of information in most adaptive hypermedia systems are server monitored events such as page visits and link selections. One drawback of this approach is that pages are treated as "monolithic" entities, since the system cannot determine what portions may have drawn the user's attention. Departing from this model, the work described here demonstrates that client-side monitoring and interpretation of users' interactive behavior (such as mouse moves, clicks and scrolling) allows for detailed and significantly accurate predictions on what sections of a page have been looked at. More specifically, this paper provides a detailed description of an algorithm developed to predict which paragraphs of text in a hypertext document have been read, and to which extent. It also describes the user study, involving eye-tracking for baseline comparison, that served as the basis for the algorithm.
The modeling method for one of classes of complex systems - discrete dynamic systems with constant structure is offered. The formalized modeling problem statement, the mathematical model and modeling algorithm of syst...
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The modeling method for one of classes of complex systems - discrete dynamic systems with constant structure is offered. The formalized modeling problem statement, the mathematical model and modeling algorithm of system are presented. As a modeling problem there was considered one of the classical problems of the theory of systems, i.e., the forecast problem of the system state. The method is based on describing the system functioning in a state space by transition function. The approbation results of method for modeling of one class of technical objects are presented.
A model is described for simulating the functioning process of a carrier standard in a system for transferring the sizes of units of physical quantities. The model is intended for obtaining values of a probability ser...
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A model is described for simulating the functioning process of a carrier standard in a system for transferring the sizes of units of physical quantities. The model is intended for obtaining values of a probability series characterizing the carrier standard being located at different stages of a standard functioning cycle.
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