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In this paper, a novel joint image fusion algorithm which is the hybrid of Orthogonal Matching Pursuit (OMP) and Principal Component Analysis (PCA) is proposed to properly utilize the advantages and to overcome the disadvantages of both OMP and PCA methods. Firstly, common and innovative images are extracted from the source images. Secondly, sparse PCA method is employed to fuse the information of...
As the need and applications of Autonomous Underwater Vehicles (AUVs) increase day by day, the research on AUVs become a popular and important topic now a days. A good number of publications are available periodically. Unfortunately till now a review report on current status of the works done on AUVs is hard to find in literature. This paper presents a comprehensive survey on recent works done on...
Online laboratories in the field of science are gaining a lot of interest in optic field because a great number of simulations can be found but almost no remote labs. Black body radiation is a hard topic specially for secondary school students so having the possibility to really see how the phenomena happen will facilitate their learning process.
Wireless Sensor Network (WSN) depends on the dense deployment of sensor nodes over a wide area. In WSN, battery is the most important resource in sensor nodes. The main objective of sensor nodes is comprised of sensing, processing and for communication. It consumes more energy mainly during transmission of data. In previous papers, virtual backbone scheduling for maximizing network lifetime has been...
Recent advancements in wireless communication and electronics have led to the development of low-cost wireless sensor networks (WSNs). A wireless sensor network consists of a large deployment of sensor nodes across a geographical area. When radio applications are considered, the sensor nodes sense the data and broadcast the sensed data to the destination or access point. In most applications, the...
IEEE.802.15.4 based ZigBee will play an vital role in the future of different fields of wireless communication due to its long battery life and less power consumption. The RSSI of radio signals used to estimate the distance between ZigBee nodes and it does not require any hardware additionally other than simply a radio transceiver. In my study, I analyze the importance of RSSI(Received signal strength...
With today's increase in the usage of wireless devices and spectrum allocation, radio spectrum is becoming scarce and it is used partially. This has evolved a concept called the Cognitive radio to exploit the presence of these spectrum holes which utilizes cooperative spectrum sensing concept for primary user detection. This spectrum sensing concept has a drawback that an intruder can capture these...
Wireless sensor networks have scarce energy resources. Improvement in power saving and network lifetime is of great significance. Idle sensors do contribute to power consumption as good as the working sensors. Wireless communication systems power consumption and network lifetime can be improved if idle sensors are brought to sleeping state. We explored state of the art in sensor sleeping strategies...
Twitter is a user-friendly social network which deserves its real-time nature. With the help of an algorithm, the investigation can be made with regard to some of the real-time events such as earthquake. The target event is assumed and classified based on the keywords, number of words and their context. The probabilistic spatiotemporal model is provided which can find the Centre of the event location...
Cognitive Radio is a novel technology that can potentially improve the utilization efficiency of the radio spectrum by opportunistically using the unused frequency bands. Spectrum sensing is the key function of cognitive radio technology. However, detection is compromised when a user experiences shadowing or fading effects. In such cases, user cannot distinguish between an unused band and a deep fade...
The rapid growth of wireless devices has to a dramatically increased in the needs of spectrum access from wireless services. Cognitive Radio (CR) technology is a promising solution to enhance the spectrum utilization by enabling unlicensed users to exploit the licensed spectrum in an opportunistic manner. In this paper, sequential channel sensing problems for single and multiple secondary users (SUs)...
We demonstrate a method to manipulate the modes and retain high quality factors of 2D photonic crystal slabs with relatively large nano-features over a wide aspect ratio range through structural symmetry breaking within the unit cell by elliptical nano-holes.
We have examined the effect of gradual breaking of symmetry on a Fano resonant metamaterial, and have been able to understand the features using theoretical models and simulations. This study should provide a basis for choosing a specific structure for a given purpose. We have been able to obtain a continous range of Q of 7 to 13.
The most significant advances in solar and space physics, or Heliophysics, over the next decade are most likely to derive from new observational techniques. The connection between advances in scientific understanding and technology has historically been demonstrated across many disciplines and time. Progress on some of the most compelling scientific problems will most likely occur through multipoint...
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