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This paper presents the implementation of distributed controls in a microgrid operation. The approach utilizes the advantages of using Multi Agent Systems technology for controlled operation of a microgrid. The auctioneer aims to optimize the operation of the microgrid by optimizing the production of local distributed generators. An artificial immune system based algorithm is applied on a typical...
In this paper we describe a new cooperating sensing method using double threshold energy detection technique for cognitive radio. Each secondary cognitive user takes a local decision on spectrum occupancy based on two threshold energy detection and uses 1 bit information to convey its decision to the fusion center that collects decisions from all cooperating users who are able to detect presence or...
Recently, great attention has been put on the possible applications of nanotechnology in photovoltaics. Here, we report room temperature growth of large area black silicon surface consisting of silicon nanowires (SiNWs) array with reflectivity reduced to < 4% in the entire spectral range (300-1000 nm) of interest for solar cells and fabrication of solar cell (n+pp+ structure) on such "black...
The management and control of shipboard medium voltage AC (MVAC) and medium voltage DC (MVDC) power system architectures under fault conditions present a number of challenges. The use and resulting interaction of multiple power electronic components in mesh-like power distribution architectures possibly result in the effects of faults being detectable throughout the system, for example, line-to-hull...
This paper describes the role of the Canadian Space Agency (CSA) in calibration monitoring activities of the SAR on-board the two RADARSAT satellites currently in orbit. First, the performance of the RADARSAT-1 SAR since commissioning in 1996 is reviewed, along with the calibration systems and methodologies in the context of the mission's eleven-year calibration history. Calibration monitoring activities...
This paper examines the calibration performance of the RADARSAT-1 products since spacecraft commissioning in 1996, and briefly reassesses the calibration ground systems and methodologies in the light of the mission's twelve-year calibration experience and data record. Choices made in the design, deployment and implementation of the RADARSAT-1 calibration plan are retrospectively explored in the context...
Shipboard electric power systems (SPS) are dynamic, complex systems that require continuous monitoring and fast controls to operate in a reliable and secure state. To enhance survivability of naval ships and meet reduced manning requirements, automatic reconfiguration for service restoration may be performed to restore the de-energized loads. This paper presents an automatic rule-based expert system...
Much interest has been drawn in Photonic crystal, which are novel nanostructure of light. In the present paper, we present how the emerging technology of Photonic crystal can be suitably exploited to design and make a nano sized tunable optical falter. A novel theory to design tunable optical filter using one dimensional nano photonic structure is proposed in this present paper far ultraviolet and...
Anomalously large Photovoltages (Voch) is observed between two horizontal electrodes, separated by a distance of ~ 1 cm, placed on the obliquely deposited semiconductor thin films on transparent substrates. This photovoltage depends on the angle of deposition beta from the normal and in certain films has been found to be maximum for the angle of deposition beta ~ 45deg. A number of investigations...
Carbon nanotubes (CNTs), carbon nanoflakes (CNFs), carbon nanoparticles (CNPs) and other related structures (known as carbon nanostructures (CNSs)) have emerged as a promising class of materials as field electron emitters. They have a low threshold field and a high emission current density which make them attractive for technological applications. In this article, we review recent progress on understanding...
Aligned multiwalled carbon nanotubes (CNTs) were grown by microwave plasma enhanced chemical vapor deposition on Si substrates using C2H2 and NH3 gas mixture. Effect of Fe film thickness (5-30 nm) on the growth, microstructure and field emission characteristics of CNT films were investigated. Both Fe particle size and CNTs diameter increased with Fe thickness but CNTs length decreased. CNTs grown...
In this article, an expert system based load shedding scheme for ship power systems is revisited. In this load shedding scheme, a popular decision making tool termed the analytical hierarchy process, is utilized for prioritizing the loads to be shed onboard a notional all-electric ship power system. The analytical hierarchy process based load shedding scheme overcomes some of the major drawbacks of...
This paper presents a combined hardware/software simulation framework for testing and evaluating decentralized control methodologies for integrated mechanical and electrical systems on board US Navy ships. Integrated ship system control is a challenging domain as it involves a set of highly complex and inter-dependent systems, including electrical power, HVAC, and an underlying communications network...
It is envisioned that in the future a naval electric ship should be operated with minimum number of human operators, while having the intelligence to automatically reconfigure its power plant under various scenarios. This should be accomplished with less response time and adequate configurations when compared to the systems operated by humans. Multi agent systems have been shown as a promising technology...
Advanced agent technology provides significant potential contribution to distributed intelligent controls. Several agent based applications have been developed in the area of power systems. Although these applications have shown some very good results, agent technology has yet to make a significant impact in the power system area. Many agent based applications are not practical due to limitations...
This paper describes the image quality control activities performed at the Canadian Space Agency on RADARSAT-1, and presents the preparations for calibration support activities for RADARSAT-2. Radiometric calibration and image quality performance of the RADARSAT-1 SAR is monitored routinely since its commissioning in 1996, based on imagery of the Amazon and of Precision Transponders. Antenna elevation...
Implementation with common object request broker architecture (CORBA) based communication mechanism between a JADE platform multi agent system (MAS) and virtual test bed (VTB) simulation package is discussed in detail. CORBA allows application interoperability, which is independent of platform, operating system, and programming language. This mechanism enables the creation of gateways between external...
A shipboard power system (SPS) supplies energy to electrical loads on a ship. It is critical for the system to be reconfigurable for the purpose of survivability and reliability. In our earlier work an agent based de-centralized approach for a radial SPS reconfiguration is successfully developed. Each agent in this system only communicates with its immediate neighbors, which reduces the dependency...
RADARSAT-1, the first Canadian SAR remote sensing satellite has successfully completed its design lifetime of five and a quarter years. It is currently in extended mission operation meeting customer demands. The Image Quality Control program is kept fully operational, and measured results indicate image quality performance is maintained better than system specification. This paper briefly describes...
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