We discuss requirements surrounding a mobile navigation system for visually impaired people. We describe an initial prototype based on a PDA using GPS location tracking. This prototype has so far failed to provide reliable location detection, due to the use of GPS in built up environments. We discuss how our system may improve detection by switching between a range of different location trackin...

Abstract Identifiability of linear dynamic networks typically depends on the presence and location external (excitation or disturbance) signals, in relation to topology parametrized network model set. For closed-loop identification, it is known that switching (non-parameterized) controllers can also provide excitation, thereby rendering set identifiable. In this paper, we derive verifiable cond...

label switching technology is a flexible and high performance method for forwarding layer three packets that are mapped to layer two flows. each label switch router, lsr, needs a specific label for every flow, where the number of labels depends on the mapping and granularity of flows. data and control driven methods are the most significant and popular methods in label mapping policy. the above...

this paper presents a novel control method to improve the efficiency of low-voltage dc-dc converters at light loads. pulse width modulation (pwm) converters have poor efficiencies at light loads, while pulse frequency modulation (pfm) control is more efficient for the same cases. switching losses constitute a major portion of the total power loss at light loads. to decrease the switching losses...

________________________________________________________________________ We assess whether bank branch placement in Bangladesh responds to any unexploited potential for non-farm rural development. The location choices of the famous Grameen Bank are compared to those of more traditional banks. We allow for heterogeneity in household characteristics conducive to success in non-farm activities whe...

In this paper, an efficient framework is proposed to the formation control problem ofmultiple agentswith unknown nonlinear dynamics, by means of the iterative learning approach. In particular, a distributed Dtype iterative learning scheme is developed for the multi-agent system with switching topology, whose switching time and sequence are allowed to be varied at different iterations according ...

Two phenomena can produce chattering: switching of input control signal and the large amplitude of this switching (switching gain). To remove the switching of input control signal, dynamic sliding mode control (DSMC) is used. In DSMC switching is removed due to the integrator which is placed before the plant. However, in DSMC the augmented system (system plus the integrator) is one dimension bi...

The main objective of this study is to reduce optimal vibration suppression of Timoshenko beam under non-periodic step and impulse inputs. Cantilever beam was modeled by Timoshenko theory and finite element numerical method. Stiffness (K), mass (M), and damping (C) matrices are extracted. Then, in order to control structure vibration, piezoelectric patches were used due to simultaneous dual beh...

The present study considers a hybrid controller scheme for the optimal switching of a moving (or scanning) actuator (MA) for a class of distributed parameter systems (DPS). The proposed hybrid controller switches both the location and control signal of the actuator at the beginning of a time interval and remains unchanged over the duration of the time-interval. As time progresses, the above pol...