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.
Power quality is an important issue for wave energy developers, as the wave energy converters output power profile presents a lot of fluctuations due to the oscillatory nature of the waves. In order to emulate an operating direct drive wave energy converter, study power quality improvement and test different control strategies, a wave-to-wire model has been developed. Although control study for wave...
We introduce an action selection framework for the advanced behavioural animation of virtual creatures. In modern creative media, the behavioural animation of characters which act in a believable fashion is an ongoing challenge. Traditional action selection approaches which attempt to make an agent act rationally often fall short of the believability required for the modern consumer. Often the most...
Modular multilevel converters (MMC) for high voltage direct current (HVDC) application employ hundreds of sub-modules. Explicit modeling of sub-modules implies hundreds of nodes and semiconductor devices in the equivalent models for the system; this in turn poses a computational challenge for electromagnetic transient (EMT) simulation. Fast and accurate simulation models for MMC based on sub-module/arm's...
This work is based on an extension of the Petri net framework. Our model relies on the definition of a priority relation between conflicting transitions, which is encoded in a compact manner by orienting the edges of a transition conflict graph. The benefit is that this allows the use of a successor function for the study of dynamic processes from a global point of view, independent from a particular...
Hardware-in-the-loop (HIL) is known as an efficient simulation approach allowing the test of control systems before implementation, where some of the control-loop components are implemented in real hardware device and some are simulated. Typical, ordinary Input/Output ports are used as an interface between the plant simulation and the embedded system under test. However, this kind of communication...
Transmission topology control (line switching) is currently practiced with manual and ad-hoc based actions by ISO control room personnel who rely on a combination of past experience and a fixed data set of line openings linked to various congestion patterns. Our previous work used sensitivity information from the solution of a DC economic dispatch problem to develop topology control algorithms that...
In Photo-Voltaic (PV) systems to increase the conversion efficiency, efficient converters and efficient PWM switching circuits are required. To design efficient converters and PWM switching circuits mathematical models are necessary. In the proposed study, the mathematical model for photovoltaic cell and for buck-boost converter is developed. In the mathematical model, the parasitic elements of switch,...
Cortical microtubules form highly ordered structures through apparent self organisation. Two of the driving factors for this are believed to be the dynamic instability of the microtubules and the interactions that they have amongst themselves. In this paper we use a 3 state model to simulate the effect of the spontaneous growth to shrinkage rate and its relationship with the spontaneous shrinkage...
Particle-based simulations are widespread in the field of computer graphics and are mainly used for simulating soft-body dynamics. Modeled objects are approximated through discrete points called particles, having various physical properties. Sociophysics has emerged alongside econophysics as a new important research domain, taking methodological inspiration from lattice model computer simulation of...
Economic-based resource management models are found to be efficient for distributed resource collaboration in the Grid. Due to the wide range of applications and dynamic nature of Grid resources, constant performance by a specific economic model is therefore subjective. This work identifies the potential of different models in different scenarios in the Grid. This identification motivates us to design...
Bioregenerative life support systems introduce novel challenges for the development of model-based approaches to their control given the varying characteristic of the biological processes that constitute them. Switching control paradigms provide an alternative to manage such uncertainty by allowing flexibility into the control path, enabling different control modes depending on the situation of the...
In this paper we argue that a judicious use of models in science and engineering can considerably simplify the design and analysis of complex dynamic systems. To substantiate this claim, we first review the mathematical form and the role played by models in science and engineering, respectively. We then show that a change in perspective on the purpose of models in the analysis of cardiac tissue, allowed...
The paper explores a control-theoretic approach to the modeling of a genetic switch associated with bacteriophage λ. The approach consists in modeling the underlying gene regulation mechanisms through the use of control theoretic abstractions of experimentally verified patterns and pathways of gene expression and repression, without resorting to the inclusion of detailed reaction kinetics. The proposed...
This paper highlights the fact that the minimal time interval to compute the spectrum of a common mode current is not more than a switching duration. From the acquisition of the common mode current generated by a buck converter, two relevant pulses are extracted as well as the switching instants. The convolution of both allows to compute a estimated common mode current that has a spectral representation...
By thinking of a society as a cognitive system, this paper proposes a theoretical framework for artificial social intelligence. This framework is implemented using Knowledge Request-Broker Architecture, and its applicability is experienced in the field of system identification by letting a society of self-interested agents, with various skills, to identify a system based on given training data. To...
This paper introduces the design of an automobile driving simulation system based on single chip computer. It's control device, with 8 bit single chip computer STC89LE516AD as its core, assisted by data acquisition circuit, data storage circuit, and data communication circuit, performs the function of collection, storage and communication of the driving information. Furthermore, with the help of visual...
In this paper, a new contention avoidance scheme called WSA (wavelength-weight statistic assignment) has been proposed for distributed lightpath establishment in PCE-based Wavelength-switched Optical Networks (WSON). WSA assigns a wavelength-weight to denote the concurrent reservation probability and source node can select several preferable wavelengths according to the weight with assistance of the...
This paper deals with problem of the real-time freeway traffic density estimation/prediction for a jump Markov linear model based on Daganzo's cell transmission variant of the Lighthill-Whitham-Richards continuous macroscopic freeway model. To solve the problem we propose a particle-filtering-based estimation/prediction method. Its performance is illustrated on case studies involving a four-cell freeway...
A continuous-time utility portfolio selection model is proposed and analyzed for a market consisting of one bank account and stock. The market parameters, including the bank interest rate and the appreciation and volatility rates of the stock, depend on the market mode that switches among a finite number of states, the random regime switching is assumed to be independent of the underlying Brownian...
Based on the single column partial differential equation model for the industry chromatographic separation, the mathematical model of the Simulated Moving Bed chromatographic separation process is established from the flow and mass conservation relations of the SMB process. Method of line is used for the numeric model computations. Simulation results show that compared with the true moving bed model,...
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.