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This paper describes the design, fabrication, characterization and application of PET/ITO and polyimidebased flexible microelectrode arrays for recording purposes and also stimulation of retinal bipolar and ganglion cells. Two different structures are designed in this work. The planar electrode arrays are fabricated on thin PET/ITO and polyimide substrates and encapsulated with SU-8 which is a biocompatible...
The generation of electricity through renewable sources has exponentially increased in recent years in response to environmental pollution caused by fossil fuels. When we talk about renewable energy is difficult not to refer to solar photovoltaic technology due to its high rate of growth compared to their peers and potential. This is associated with the fact that the Ecuadorian government is implementing...
The increase in the amount of data acquired from the monitoring of power system components has motivated utilities to employ effective strategies for processing the information collected. Hence, salient features can be identified and efficient decisions is made. An important component of any power system is power transformers, which have the single highest value of the equipment installed in high-voltage...
A new energy management system is proposed in this paper to optimally schedule different generation technologies in hybrid AC/DC microgrid for remote communities. The proposed scheme relies on a microgrid controller (MGC), which minimizes the operational costs for different distributed generation (DG) units in the islanded microgrid by sending droop characteristics parameters to the DG units to ensure...
Heuristic optimization techniques are easily applicable to a wide variety of cases which makes them a popular choice for complex problems that can be difficult to solve by traditional methods. This paper presents the application of the Global Harmony Search Algorithm (GHS) to the optimal placement and sizing of STATCOMs in power systems. In the first part, the benefits of STATCOMs installation are...
The ubiquity of wireless communication and growth in data rate are motivating researchers to explore new frequency spectrums. Wireless communication is highly dependent on the channel characteristics. Only the complete knowledge of channel properties can provide reliable communication. These characteristics are measured using an experimental setup, called channel sounder. The performance of channel...
Reducing the global energy consumption is an important goal of fifth generation (5G) networks. The cloud-radio access network (C-RAN) along with power control mechanism can potentially offer the much sought after relief in energy consumption by enabling centralized processing. In this paper, a tunable downlink distance-based power control mechanism is considered and its effects on network-level coverage...
Survivability of contents/files in data centers, when a disaster occurs, is becoming a major challenge in designing cloud-based services. To handle such a situation, a robust communication protocol is needed, so that provisions can be made to allocate an alternative fault-free path, when a disaster disrupts the path used for data communication before the disaster occurs. In this work we have presented...
Various optimal power flow (OPF) algorithms have been utilized in power networks primarily for cost reduction, profit optimization and/or system loss minimization. However, these optimization solvers are either computationally demanding or sensitive to initialization settings and do not guarantee a global optimal. In order to overcome these challenges, this paper proposes an artificial intelligent...
In this work, a data-driven fault diagnosis and estimation scheme is proposed and developed specifically for aircraft gas turbine engine actuator and sensors. The proposed fault detection, isolation and estimations filters are directly constructed by using only the system I/O data at each operating point of the engine. The associated system Markov parameters are estimated by using the frequency response...
Transparent optical networks (TONs) has the advantage of handling high data rates through effective utilization of the fiber bandwidth. However, features like transparency in TONs makes such networks susceptible to several physical layer attacks. Hence, designing TONs with a capability of handling such high power jamming attacks is an important network security problem. In this work, we propose an...
The business case for MMC-HVDC is becoming popular in power transmission systems. Despite their superior potential compared to the AC and LLC-HVDC technologies, MMC-MTDC grid is yet to be efficiently realised in practice. Operation, control and modelling in such VSC-based schemes are arguably the most challenging research and development problems that academia and industry are presently engaged in...
Joint power control with optimal beamforming design and power control with minimum antenna selection under signal to inference noise ratio constraints have been considered in separate wireless communication scenarios. In power control algorithms, multiple antennas with linear beamforming are used to reduce the interference power, which also minimizes the total transmitted power in uplink/downlink...
Different applications in smartphones result in different power consumption patterns. The fact that every application has been coded to perform certain tasks leads to the claim that every action on-board (whether software or hardware) will consequently have a trace in the power consumption of the smartphone. However, similar power consumption patterns are observed for the same application irrespective...
In this paper, we consider the problem of enhancing the filtering capacity of single standard beamformers for real base-band signals. Unfortunately, the standard smart arrays are not able to effectively minimize the effects of the complex noise in the array. In order to solve this problem, we analyze a parallel adaptive beamforming system based on complex nonlinear adaptive filters. In this design,...
This paper presents a means of tuning an adaptive internal model principle based signal identification algorithm whose computational costs are low enough to allow a realtime implementation. The algorithm allows an instantaneous Fourier decomposition of nonstationary signals that have a strongly predictable component. Previous work showed how the dynamics of the algorithm could be chosen to be represented...
Conventional power network capabilities have improved and enhanced by the smart grid but at the same time making it more vulnerable to different types of attacks. These vulnerabilities allow an attacker to breakdown integrity and confidentiality and permit access to the network. Intrusion Detection System (IDS) is one of the significant ways to provide secure and reliable services in a smart grid...
This paper proposes a speech enhancement approach that uses both the spectral and spectral modulation domains. In this approach, the noisy speech signal is enhanced simultaneously in the spectral domain, using a minimum mean square error (MMSE) short time spectral amplitude estimator, and in the spectral modulation domain, using a MMSE spectral modulation magnitude estimator. The results of both estimators...
Remote control of grid tied converters has become important with an increasing number of grid connected energy storage systems. Hence, it is crucial point for utilities to outline the requirements of the communication methods and to find the best communication infrastructure to handle the remotely located converters in a reliable and cost effective manner throughout the operation. The purpose of this...
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