This paper presents some advanced facilities and services related to the use of everyday telephones. The caller identification and answering machine are advanced telephone functions. The telephone system can be used a...
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This paper presents some advanced facilities and services related to the use of everyday telephones. The caller identification and answering machine are advanced telephone functions. The telephone system can be used as a tele-security system. This research work is based on the potential use of a low cost 8-bit microcontroller. The caller identification (caller ID) system is a feature of digital telephone networks and is supported by signaling system no. 7 (SS7) which uses a separate call data circuit. The caller ID information is transmitted on the subscriber loop using frequency shift key (FSK) modem tones and data is embedded between the first and second ring of the ringing signal. A caller ID decoding circuit has been designed for decoding the FSK modem tone and the appropriate ASCII code is displayed in the LCD unit. An answering machine is a device that answers the telephone calls in the absence of the called party and records the incoming message into a cassette. A ring detector circuit, outgoing message (OGM) sender circuit, tape driver circuit, dual tone multiplexed frequency (DTMF) encoder circuit and calling party control (CPC) circuit have been developed for the answering machine device. The DTMF generator circuit and sensor signal management circuit have been integrated to provide a tele-security system. A PIC 16C84 (8-bit microcontroller) controls all logic operations as it was programmed. Software has been produced in assembly language for programming of the microcontroller.
A partially recursive backstepping-like procedure to design estimation-based controllers for uncertain nonlinear systems is presented. Its motivation relies on the intent of reducing the computational load of the n-st...
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A partially recursive backstepping-like procedure to design estimation-based controllers for uncertain nonlinear systems is presented. Its motivation relies on the intent of reducing the computational load of the n-steps backstepping design by exploiting the promising features of second order sliding mode control. The proposed approach exhibits modularity, in the sense that the controller is proved to guarantee input-to-state stability regardless of the choice of the parameter estimation mechanism.
The paper is devoted to the introduction of a multi-input second order sliding mode control algorithm in a underwater robotic context. This approach guarantees perfect tracking and stabilization in presence of disturb...
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The paper is devoted to the introduction of a multi-input second order sliding mode control algorithm in a underwater robotic context. This approach guarantees perfect tracking and stabilization in presence of disturbance and uncertainties typical of this kind of system. This property is guaranteed by acting on the voltage of the motors driving the thrusters and the resulting forces and torques are continuous.
High-speed input queued switches are known to more economical and simpler than output queued ***,they suffer from HOL blocking which degrades throughput *** queued switches can achieve higher throughput if they use ra...
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ISBN:
(纸本)7800908275
High-speed input queued switches are known to more economical and simpler than output queued ***,they suffer from HOL blocking which degrades throughput *** queued switches can achieve higher throughput if they use random access input queues and cell scheduling ***, input queued ATM switches employing the cell- scheduling algorithm can increase the throughput by preventing output ***-firing cell scheduling algorithm in input queued ATM switches has been proposed but it is unfair in the sense that the throughputs from various input ports differ by significant *** this paper, we propose cell scheduler that has inherent fairness property under any traffic pattern and prove that the proposed cell scheduler guarantee fairness even if traffic is not uniform pattern by computer simulation.
An investigative tool for the direct study of end-to-end Internet traffic is presented, featuring a hybrid timing mechanism allowing high resolution time-stamping of packet departures in a UNIX environment. A method f...
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An investigative tool for the direct study of end-to-end Internet traffic is presented, featuring a hybrid timing mechanism allowing high resolution time-stamping of packet departures in a UNIX environment. A method for the elimination of timing artifacts due to variations in clock rates, essential for the study of delay, is also presented. A preliminary report is gives on the detailed structure of end-to-end delay and loss processes using the tool. A number of consistent properties of interest are found including long range dependence in delay and a very simple structure for loss.
The paper presents the definition of the characteristics of a new manipulator based on the elephant trunk principle but with a special kind of large bandwidth actuators working with oil at low pressure, controlled by ...
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The paper presents the definition of the characteristics of a new manipulator based on the elephant trunk principle but with a special kind of large bandwidth actuators working with oil at low pressure, controlled by the sliding modes technique and with a new simplex-based approach for tracking trajectories. This work represents a point of convergence of two complementary activities. The first activity was aimed at defining an electromechanical structure characterized by a model with reduced complexity and uncertainties, while the second one was devoted to the development of an appropriate control methodology exploiting the mechanical structure main features, to achieve tracking objectives despite of uncertainties and nonlinearities.
In this paper the authors present a couple of algorithms, one for the case of analogue devices and one for the case of digital devices, that realize a nonlinear controller performing a second order sliding mode. These...
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The aim of the present paper is to formulate a simple model of a flexible robotic structure and to propose a class of control strategies based on the sliding modes concept, which appear to be particularly effective in...
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