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We report corneal topography of fish eye using low coherence interference microscopy. This technique is non-invasive determination of refractive index variation which will be helpful in finding corneal power as a function of wavelength.
The evolution of chain of uni-polar vortices in propagation of Helico-Conical beam plays an important role in shaping the helical amplitude profile in focal volume. This evolution is compared with that of fractional vortex beam.
This research paper analyses the electrical performance of various structures of Organic Thin Film Transistors (OTFTs) based upon their current-voltage characteristics and performance parameters. Further, the effect of variation of electrode thickness on drain current and electrical parameters has been investigated. Electrode thickness is varied from 0 nm to 40 nm in the steps of 10 nm for staggered...
In this paper, we consider sum-networks, which is a class of directed acyclic networks where each terminal in the network requires sum of all the sources. In the literature, all reported sum-networks are shown to have only certain rational valued coding capacities. For example, it has been shown that a sum-network, having 3 sources and 3 terminals, has coding capacity either 0, 2 over 3 or ≥ 1. It...
WiMAX is a broadband wireless technology uses radio transmission for high speed direct access to internet. It is similar to Wi-Fi in working but differs in coverage area, bandwidth and many other aspects. The work discusses various security challenges of WiMAX. Moreover, traffic analysis at different packet length is also presented over IEEE 802.16(e) network so as to give a clear picture of traffic...
In this work, we present a analytical hierarchy process (AHP) for computing trust in the vehicular ad hoc networks (VANETs). AHP based trust management provides a lightweight security alternative to existing security techniques. Trust Management in VANETs is required to broadcast of selfish or malicious messages and also enable other vehicles to filter out such messages. A trust management system...
We consider directed acyclic networks where each terminal requires sum of all the sources. Such a class of networks has been termed as sum-networks in the literature. A sum-network having m sources and n terminals has been termed as a ms/nt sum-network. There has been previous works on the capacity of sum-networks, specifically, it has been shown that the capacity of a 3s/3t sum-network is either...
Abstract-In this work, we study the application of Perron-Frobenius theorem for computing trust in the VANET environment. Safety critical and safety related messages in a VANET can lead to major changes in the behavior of vehicles moving on the road which can prevent unpleasant traffic situations. False messages can result in serious conditions like collisions. Trust management in VANETs is necessary...
Ad hoc network is a collection of wireless mobile nodes dynamically forming a temporary network without the use of any network infrastructure or centralized administration. In this work, an attempt has been made to study the performance of two prominent on demand reactive routing protocols for mobile ad hoc networks i.e. DSR and AODV. Although DSR and AODV share similar on-demand behavior, the differences...
In this paper, we consider sum-networks where each terminal requires sum of all the sources. For a sum-network having 3 sources and 3 terminals, it is known that the network is solvable if the min-cut between each source and each terminal is at least 2. However, it is not known whether this condition is sufficient for sum-networks having arbitrary number of sources and terminals. In the present work,...
In this research paper, performance characteristics of the various operating modes of dual gate organic field effect transistors (DG-OFETs) are analyzed Comparative analysis between single-gate and dual-gate OFETs is carried out. Further, effect of gate dielectric thickness (tox) variations ranging from lOOnm to 200nm is investigated. Observations reveal that the electrical characteristics are strongly...
This paper proposes an analytical model for the bottom gate structure comprising contacts at above the semiconductor and/or insulator layer in organic thin film transistor (OTFT) on the basis of contact resistance effect. These devices suffer from limitations such as contact resistance, low mobility regions and low mobility of charge carriers. In lieu of that, contact resistance and contact effect...
Cuk converter contain two inductor and two capacitor hence it is fourth order dc-dc converter. It provides output voltage both higher as well as lower than the input voltage. Design of feedback compensator for fourth order system is quite complex. In this paper, model order reduction technique is used for controller design of Cuk converter. First small signal dynamic model for Cuk converter using...
Various techniques have been developed in attempt to minimize congestion in uniformly distributed networks. In this paper, a new algorithm, load balanced congestion adaptive routing (LBCAR) algorithm has been proposed for randomly distributed networks in which two metrics: traffic load density and life time associated with a routing path, have been used to determine the congestion status and weakest...
In this paper, the suitability of the existing MANET routing protocols for VANETs has been evaluated. Even though a VANET is a subset of MANET, it has unique characteristics and message delivery requirements. VANETs are characterized by a very dynamic topology with partial infrastructure support, patterned mobility, mobile nodes with sufficient resources, intermittent connectivity and varied channel...
This paper proposes an analytical model for bottom gate structures of Organic Field Effect Transistors (OFETs). Structural analysis and significant advantages of top contact over bottom contact devices are demonstrated by 2-D numerical device simulation. Top contact devices observe relatively small contact resistance as compared to bottom contact one due to larger injection area. It results in higher...
This paper presents device physics based on electrical modeling of staggered and planar structures of Organic Field Effect Transistors (OFETs). It is preferable to have compact dc models that can be used in simulations to forecast and optimize performance of OFETs. Since a unified compact model is not sufficient to derive all characteristics using materials and fabrication processes, therefore, several...
This paper presents massive analytical analysis of Bottom Gate Top Contact (BGTC) and Bottom Gate Bottom Contact (BGBC) structures of Organic Thin Film Transistors (OTFTs). It is preferable to have compact dc models that can be used in simulations to forecast and optimize performance of organic material based devices and circuits. Since a unified compact model is not sufficient to derive all characteristics...
Cracked glass plate is used to generate optical vortex beam. Fork fringes in the experimental results confirm the presence of vortices in the output beam. The phase map plot of fork fringes also confirms the presence of vortices exactly at the position of forks.
With the proliferation of digital contents and the expanding variety of connected and IP-enabled consumer electronics (CE) devices, consumers are increasingly seeking ways to efficiently integrate their mobile devices with home networked devices. Expanding wireless coverage is enabling exciting new set of consumer-focused applications between CE devices, mobile handsets, home appliances and personal...
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