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Hollow core photonic crystal fiber (HC-PCF) has emerged as a new generation micro-structured fibers with an ability to confine light within the core region. The possibility of infiltrating the analyte within the HC-PCF has further given boost to the strong light-matter interaction. It, therefore, lays a platform for harnessing the maximum potential of existing spectroscopic techniques in sensing broad...
Silicon Carbide is the promising technology for the applications in high frequency, high voltage, high power and high temperature, principally due to their low conduction losses and fast switching capability. The aim of this paper is to test and evaluate the dynamic characteristics of SiC transistors and describe the utilization of full performance of SiC for photovoltaic applications. A standard...
In this work we discuss some results on stability analysis for nonlinear systems with time-delays. A central theme of the work is to treat state variables with time-delays as disturbances and uncertainties. The advantage of such an approach is that by exploring the robust stability properties of a system with disturbances, one may obtain various properties for a system with time-delays.
Phase scintillation, e.g. as observed from GPS satellites by ground receivers, is generally measured as the standard deviation of the random fluctuations of the phase received over a fixed period of time which is ofteny taken to be 60s. The measured phase scintillation can be an important tool in understanding the ionospheric turbulence producing it, and consequently its effect on GPS positioning...
Orthogonal frequency division multiplexing (OFDM) is multi carrier modulation scheme. The channel estimation is a process of characterizing the effect of the transmission channel on the input signal. In this paper we compare the performance of Least Square (LS) and Linear Minimum Mean Square Error (LMMSE) channel estimation technique for Wavelet based OFDM system. The channel estimation based on block...
Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) approach using UWB signals with short duration of pulses provide unique advantages in short-range high data rate wireless applications which include easy penetration through obstacles, high precision ranging and low processing power. A perfect reconstruction using discrete wavelet packet transmultiplexer in MB-OFDM transceiver counters...
Routing in WSNs (Wireless Sensor Networks) is very challenging due to some special characteristics that differentiate these networks from other wireless networks like cellular networks, mobile ad-hoc network etc. The difference is due to scalability, careful resource management etc. Sensor nodes are generally battery powered, are expected to be remotely deployed, and operated autonomously in unattended...
We demonstrate the use of torsion in nanorelays to achieve low voltages, high speeds, single lithography step construction, and a form useful for configurability and electronic design enhancements in three-dimensional integrated implementations. The combined bending and torsion of self-aligned nanopillars facilitates the first top-down fabricated vertical three terminal nanoscale relay. Experimental...
The power system is a dynamic system that is constantly being subjected to disturbances. It is important that these disturbances do not drive the system to unstable conditions. The Unified Power Flow Controller (UPFC), which is a FACTS device, simultaneously controls the real and reactive power flows on a transmission line as well as regulates voltage at the bus where it is connected. This device...
Web services provide a promising solution to an age old need of fast and flexible information sharing among people and businesses. Selection of web service has become a tedious job because of the increasing number of service providers providing services with similar functionality. Service registries are becoming very large preventing users from discovering desired service. Sometimes service users...
In this work, small-gain theorems for large-scale time-delay systems are developed using a Razumikhin-type approach, both in terms of ISS and IOS. In the spirit of the Razumikhin theorem, the state variables with delays are treated as disturbances to the system. This approach converts the problem of stability analysis for functional differential equations to the more tractable problem of stability...
In this paper, we are proposing a novel optical multiple access approach which utilizes the interleaving as only means of user separation. This is different from conventional code division multiple access schemes in which different signature sequences are used to distinguish users. Optical interleave-division multiple-access (OIDMA) scheme inherits the advantage of both Optical system and IDMA technique...
Wireless Sensor Networks (WSNs) is an emerging field of engineering with various applications. They have emerged as a new class of large scale networks of embedded systems with limited communication, computation and energy resources. Recently adopted IEEE 802.15.4 standards for Low-rate Wireless Personal Area Network (LR-WPAN) are most extensively used communication platform for WSNs. Conventional...
In wireless communication, regarding all the multiple access schemes, fading is referred to be major problem in multipath environment. Recently, IDMA scheme has attracted much attention of the researchers all over world as a potential candidate for future generation wireless communication systems. This scheme has also been victim of fading phenomena during communication process. In this paper, the...
In this paper, we present a novel design for realize full adder circuit. Our approach based on XOR-XNOR design full adder circuits in a single unit. Objective of this work is to investigate the power, delay and power delay product of low voltage full adder cells in different CMOS logic styles. Simulation results illustrate the superiority of the proposed adder circuit against the conventional CMOS,...
To support high scalability and better data aggregation, sensor nodes are often grouped in to disjoint and mostly non overlapping sub sets called clusters. Clusters create hierarchical WSNs which facilitate efficient utilization of limited resources of sensor nodes and thus extends network lifetime. ZigBee, a communication standard for LR-WPAN (Low Rate Personal Area Networks), has low power consumption,...
Web services provide a promising solution to an age old need of fast and flexible information sharing among people and businesses. One of the key research issues in web services is selection of most pertinent web services. Selection of web service has become a tedious job because of the increasing number of service providers providing services with similar functionality. Therefore, a framework for...
Wireless Sensor Networks (WSN) are resource constrained systems that needs efficient utilization of all resources. Clustering is well known technique for achieving high scalability and efficient resource allocation in WSN. One of the fundamental issues in cluster based networks is to determine the optimal number of clusters with the objective of minimizing the energy consumption. Considering its importance,...
By characterizing the mobility of Si-face/C-face of SiC graphene before and after stacking the layer of HfO2 with a polyvinyl alcohol (PVA) treatment on the device active layer, we have explored the properties of SiC based epitaxial graphene and the effects of the dielectric film with PVA treatment. Epitaxial graphene grown on the carbon face produces a higher mobility than film grown on the silicon...
Mutation Testing is used as fault-based testing to overcome limitations of other testing approaches but it is recognized as expensive process. In mutation testing, a good test case is one that kills one or more mutants, by producing different mutant output from the original program. Evolutionary algorithms have been proved its suitability for reducing the cost of data generation in different testing...
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