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 paper is devoted to a comprehensive modelling of the influence of the operation process and the climate-weather change process on the safety of a critical infrastructure. Particular models of critical infrastructure safety influenced by its inside among its components and subsystems dependences and by its outside operating environment threats and climate-weather hazards are created and a reasonable...
In this day and age, many universities in Thailand have specific targets for students to achieve academic success and earn honours degrees. Such targets are based in part on the unique identity of each university. This paper aimed to provide a modelling and recommender application, which gathers and utilises the characteristics and attitudes of students in order to accurately predict and select the...
Optimisation during the design of large manufacturing systems is a key issue. An adequate modelling formalism to express the intricate interleaving of competition and cooperation relationships is needed first. Moreover, robust and efficient optimisation techniques are necessary. This paper presents an integrated tool for the automated optimisation of DEDS, with application to manufacturing systems...
For first order plus dead time models, an optimal method for tuning PI controllers is presented using dimensional analysis and numerical optimisation techniques. Considering a step change in setpoint, optimal equations for determining PI parameters are obtained through minimising the integral of absolute error (IAE). The optimisation process is constrained to guarantee a minimum Gain margin (G.M.)...
The Internet topology has been studied extensively for decades. However, the emphasis of Internet topology research has been on logical level topologies. On the other hand, physical level topologies are necessary to study the resilience of networks realistically. In this paper, we analyse the structure of synthetic geographic topologies whose node locations are given by those of actual physical level...
The European Electronic Toll Service (EETS) allows different possibilities for the overall system design of interoperable toll systems. We study the effect of the overall system design on the operational costs using a model based, holistic, executable specification. The model is set up to give an accurate description of the interdependences as seen in the German toll system. Two different scenarios...
Recent ordinary differential equation (ODE) based techniques allow efficient analysis of Markovian population models with extremely large state spaces. In most cases of realistic scale, they provide the only alternative to stochastic simulation. Moreover, numerical solution of the ODEs is cheaper computationally than simulation by orders of magnitude. We present the Grouped PEPA Analyser (GPA) tool...
The DRAM latency modeling is complex because most chips contain row-buffers and multiple banks to exploit patterns of DRAM accesses. As a result, the latency of DRAM access not only depends on the circuit timing parameters but also memory access patterns. This study derives an analytical model that predicts the DRAM access performance using DRAM timing and memory access pattern parameters. As a performance...
This paper proposes that using response surface methodology to solve multiple variables problems, for multiple responses, transforming each response into desirability function and combined them to an overall desirability function, so the multiple responses can be changed into one single function, the overall desirability is solved through intelligent algorithm. At last section, a study case is given...
In this paper, word-length optimization for a pipelined 8K FFT processor is presented. The processor is based on radix-2/4/8 and mixed radix algorithm, and SDF architecture is used. The internal word-length and data format are important issues when designing pipelined FFT processors, it will affect precision and gate number. To obtain a good solution, three Matlab models for the processor are developed...
Electric power grid operation being an ever challenging scientific field is faced with a high variety of optimization problems. Since the future vision of so called smart grids causes higher complexity and new requirements to these problems, sophisticated investigation in suitable optimization algorithms is essential. Here, metaheuristic optimization strategies are proven to be suitable for high dimensional...
Consider the problem of selecting the best simulated system with high probability, from a finite and huge set of alternative systems. The best system might be the one that has the maximum or minimum performance measure. In this paper, we present a sequential method that uses the Ordinal Optimization procedure to select randomly a subset that overlaps with the set of the actual best m% systems with...
In this paper, we present different modeling and execution frameworks that allow us to efficiently analyze, design and verify complex systems, mainly to cope with the specific concerns of the Real-time and embedded systems (RTE) domain. First we depict a UML /MARTE based methodology for executable RTE systems modeling with a framework and its underlying model transformations required to execute UML...
A new simulation analysis algorithms establishing wireless sensor networks communication path based on ant algorithm was proposed. The local optimization problem Occurred in large-scale sensor nodes is solved. The new algorithm has good scalability and dynamic adaptability and is very effective to determiner multi-node wireless sensor network communication processes. The algorithm is feasible through...
Taking an engineering design case about the dynamic model updating of long-span bridge under environment excitation, the three dynamic calculating models of the cable-stayed bridge are created by the finite element analysis program ANSYS, and the dynamic characteristics were analyzed, further by experimental results carried out on three models optimized amendment. The analysis results show that according...
According to the Multi-body Dynamics, the lateral disturbances on high-speed vehicle are simplified as lateral forces and difference torques which act on the cm of the vehicle. And a 3 DOF vehicle model is set up for analyzing. It has theoretical significance on the later researches of high-speed vehicle stability with lateral disturbances to consider the disturbances as lateral forces and difference...
Based on the analysis of the manipulator operational principle, do its theoretical analysis by using theoretical mechanics and figure out its relationship between input and output force. Construct the model in UG and import it to ADAMS by the “parasolid” standard. Build constraint relation and do simulation. According to the results of simulation to choose the right parameter as design variable to...
In an all electric ship, the intelligent and integrated power system (IPS) that allows for reconfiguration offers better fight-through and survivability capabilities compared to manual service restoration. Automated reconfiguration involves optimizing the status of switches (ON/OFF) such that power delivered to loads is maximized after the occurrence of a fault. The priority is given to vital loads...
According to the working features of the drawing press,the article discusses its optimization design, how to establish the model and analyse dynamics based on Virtual Prototyping (VP) technology which integrates CAD, CAE and visual technologies, etc., and compared the simulative results and theoretic results. The results show that the motion characteristics of optimization model can meet to the sheet...
The design of technological systems that can be modelled as discrete event systems (DES) constitute a difficult problem with important implications in the performance of the operation of the systems during their complete lifetime. The independent simulation of the behaviour of selected alternative structures for the system to be designed constitutes a classical approach for the decision support systems...
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.