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.
Ultrasonic motor (USM) causes serious characteristic changes during operation and contains non-linearity caused by frictions. To compensate the characteristics, the internal model control - proportional integral differential (IMC-PID) control which requires only one parameter setting beforehand is widely applied to the control of ultrasonic motor. However, there are limitations of control performance...
An adaptive observer is proposed for a class of uniformly observable nonlinear MIMO systems involving some unknown constant parameters. Two main characteristics of the proposed observer are worth to be mentioned. The first lies in the fact that the exponential convergence of the proposed observer is guaranteed under a certain persistant excitation condition which is given. The second main characteristic...
A dynamic high gain based observer is proposed for the class of uniformly observable systems which are observable for any inputs. The main feature of this observer consists in an appropriate calibration of the observation gain through a single parameter governed by some scalar Riccati equation. Simulation results are given in order to highlight the performances of the proposed observer, namely its...
This note synthesizes results obtained by the authors on the stability and robustness analysis of cascaded systems. It focuses on two properties of interest when dealing with perturbed systems, namely integral input-to-state stability and practical stability. We present sufficient conditions for which each of these notions is preserved under cascade interconnection. The obtained conditions are of...
We consider the sensor selection problem in a wireless sensor network attempting to solve a binary hypothesis testing problem. The selection is based only on the sensor observations and the focus is on the extreme case where the position of the sensors is not exploited except through its influence on the sensor observations. Decentralized processing approaches are desired. A subset of sensors are...
In this paper, we present the cognitive radio system design with partial channel state information known at the transmitter (CSIT). We replace the dirty paper coding (DPC) used in the cognitive radio with full CSIT by the linear assignment Gel'fand-Pinsker coding (LA-GPC), which can utilize the limited knowledge of the channel more efficiently. Based on the achievable rate derived from the LA-GPC,...
Data uncertainty is common in real-world applications due to various causes, including imprecise measurement, network latency, outdated sources and sampling errors. These kinds of uncertainty have to be handled cautiously, or else the mining results could be unreliable or even wrong. In this paper, we propose a new rule-based classification and prediction algorithm called uRule for classifying uncertain...
This paper deals with robust control problem of an electropneumatic system subjected to parameters uncertainties and load disturbances. The control strategies are based on passivity control approaches. First, the nonlinear model of the electropneumatic system is presented. Then, a nonlinear control law is developed without depending on the mass of the carriage, to track desired position. Experimental...
Some matters on online tutorship in graduation design are discussed, which are the definition of online tutorship and learning interaction, studentspsila preference to tutorship means for graduation design, learning loneliness and the vicarious interaction in online tutorship. The advantages of online tutorship are following: the flexibility management, sharing resources of teachers, information and...
In this paper, we present a proportionate-type normalized least mean square algorithm which operates by choosing adaptive gains at each time step in a manner designed to maximize the conditional probability that the next-step coefficient estimates reach their optimal values. We compare and show that the performance of the maximum conditional probability density one-step algorithm is superior to the...
The paper details the application and handling qualities evaluation through computer-based simulation of an adaptive model reference controller acting on the longitudinal modes of a fighter-type aircraft. Whereas classical control designs depend largely on a priori knowledge of the system dynamics, adaptive control algorithms do not require the same degree of a priori sophistication, or alternately...
This article presents robust control of the mobile inverted pendulum system(MIPS) whose structure is a combination of a wheeled mobile robot and an inverted pendulum with two arms. The MIPS navigates on the horizontal plane while balancing the pendulum. Control of the MIPS is difficult since the system is non-holonomic and nonlinear so that simple linear controllers may have poor performances for...
This paper studies and analyses the benefits of favoring the transfer or packets of a TCP flow over a best-effort network. Specifically, we aim at studying whether we could improve the pace of short data request, such as HTTP request, by giving a high priority to that are not previously enqueued inside a core router. Following the idea that long-lived TCP flows greatly increase the routing queue delay,...
This paper proposes fault (attack) detection and localization scheme to handle multiple failures (attacks) in the optical network using wavelength-division multiplexing (WDM) technology. This proposed scheme is two-phased scheme containing (a) the detection of faults (attacks) through monitoring devices raising alarms (fault or attack detection) and (b) subsequently the localization of these faults...
Monolithic dc/dc converters provide a small solution size for the power management industry by integrating power switches with pulse width modulation (PWM) controllers. On the other hand, partial or all key control loop design parameters are hidden inside a black box. A practical way to identify the values of those parameters not only provides an effective tool for a system designer to retrieve information...
Two methods of constraining the waveform auto-correlation sequence (ACS) in a radar waveform optimization problem are compared. The first method directly constrains the envelope of the waveform ACS, whereas the second method indirectly constrains the waveform ACS through the imposition of a similarity constraint. Both methods are imposed in conjunction with constraints on the waveform modulus. The...
A new criterion is derived for the amount of compensating ramp needed for the deadbeat response of the constant-frequency, trailing-edge modulated, peak current-mode controlled buck converter in continuous conduction mode. The criterion is derived using modified z-transforms and verified experimentally. It is shown that the use of the new criterion results in a faster step-response than when the compensating...
Due to their popularity, dense deployments of wireless local area networks (WLANs) are becoming a common feature of many cities around the world. However, with only a limited number of channels available, the problem of increased interference can severely degrade the performance of WLANs if an effective channel assignment scheme is not employed. Previous studies on channel assignment in WLANs almost...
Web-based interactive applications may combine the interactive and tailored nature of successful behavior change interventions with the wide reach needed to target the general population. There is a lack of insight in the requirements for successful interactive Web-based applications in prevention. The objective of this research is to evaluate the Healthy Weight Assistant (HWA) of the Netherlands...
We live in a world where is no problem to own quite powerful workstation. However, despite of such concepts like volunteer computing, grid and cluster computing, there is still a high number of idle workstations that are wasting their computational potentials. We believe that better utilization of an idle computing power can be achieved by economical stimulations. In our recent work, we designed a...
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.