On-time Systems Research Articles

A novel adaptive load frequency control in single and interconnected power systems

This paper presents an adaptive load frequency control technique in both of isolated microgrid power system and two interconnected microgrids (MGs). A modified Jaya optimization method is used to make online tuning of the area controller. The Balloon Effect (BE) modification is designed to increase the sensitivity of the Jaya algorithm to both of the system load disturbance and parameters variations. In Jaya with BE technique, the objective function (OF) is affected by the on-time system problems. Communication delay time is considered in the dynamic model of interconnected MGs. System with proposed adaptive control method has been tested in several scenarios including step and variable load demand and parameters variations. Simulation results using Matlab software show that the proposed adaptive controller tuned by Jaya + BE technique provides better performance of frequency control than other methods such as conventional controller or adaptive one tuned by classical Jaya algorithm.

The emergence of transient electronic devices

Abstract

Temporal Incoherence-Free Video Retargeting Using Foreground Aware Extrapolation

Video retargeting is a method of adjusting the aspect ratio of a given video to the target aspect ratio. However, temporal incoherence of video contents, which can occur frequently by video retargeting, is the most dominant factor that degrades the quality of retargeted videos. Current methods to maintain temporal coherence use the entire frames of the input videos; however, these methods cannot be implemented as on-time systems because of their tremendous computational complexity. As far as we know, there is no existing on-time video retargeting method that can avoid spatial distortion while perfectly maintaining temporal coherence. In this paper, we propose a novel on-time video retargeting method that can perfectly maintain temporal coherence and prevent the spatial distortion by using only two consecutive input frames. In our method, the maximum a posteriori-based foreground aware-block matching is used for the extrapolation that extends the side area of a given video to adjust its aspect ratio to the target. To maintain the temporal coherence of the extended area, the result of block matching for backward warping-based extrapolation of the start frame after the scene change occurs, is reused for the other frames until the next scene change occurs. In addition, we propose a scene scenario-adaptive fallback scheme to prevent severe distortions that can occur with reusing block matching results or extrapolation-based side extension. The simulation results showed that the proposed method greatly improved the bidirectional similarity value, which can measure the quality of video retargeting, by up to 10.26 compared with the existing on-time video retargeting methods.

The On-TIME User Interface

This demonstration concerns the visual user interface of the On-TIME system, a task-centered information management system, whose aim is to actively participate to and support the user tasks. The design of a user friendly interface is one of the key challenges that needs to be addressed for the success of On-TIME. Being On-TIME based on the use of a so-called Personal Ontology to provide a semantic account to user’s personal data, the interface has to allow the user to easily browse the ontology. On the other hand, it has to address the management of tasks. This requires to both suggest tasks that the user might be willing to perform, and to support her while executing tasks. We present a typical user scenario in order to illustrate a possible interaction with the On-TIME interface, and discuss some preliminary user evaluation.

Can Sulphides be Discriminated from Conductive Slates? A Case History at Dugald River

If an excellent conductor is located within a conductive host or halo, a counter-intuitive effect may be seen in impulse response results. The presence of the very conductive core can dramatically reduce the fitted time constant of the observed decay at early to mid delay times, and the response due to the slow decay of currents within the core itself may not become dominant until very late delays when the signal may lie beneath the noise level. With an on-time system, although the 'total' response may also lie below observable noise levels, a detectable secondary can easily be inferred since the total field measured is markedly different from the calculated primary field. The Dugald River zinc-lead-silver deposit in Northwest Queensland consists of a massive to brecciated sulphide lode hosted within conductive slates. Modelling of the observed borehole response of Utem and Sirotem data requires the presence of very conductive material with a decay constant of more than 200 ms. This would imply that the conductance of the lode must be well in excess of 500 S. This value may seem very high, but is consistent with a nominal thickness of 20 m and physical property measurements. Interpretation of the surface and borehole Utem data imply that a very conductive target, approximately coincident with the lode horizon, can be discriminated from the slates, and must extend to great depths. Borehole Sirotem data indirectly appear to support the premise that the lode is very conductive, but only with the benefit of careful modelling. By contrast airborne Geotem data using a 75 Hz base frequency is comparatively insensitive to excellent conductors; and all detected anomalies in the survey can be attributed to the response of the shales alone. This is a result of the relatively high frequency transmitter waveform and off-time measurement used in the AEM system.