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PERFORMANCE COMPARISON OF POSITION-BASED ROUTING PROTOCOLS IN VEHICLE-TOVEHICLE (V2V) COMMUNICATION
RAM SHRINGAR RAW,,SANJOY DAS
International Journal of Engineering Science and Technology , 2011,
Abstract: Vehicular Ad hoc Networks (VANETs) is the new wireless networking concept of the wireless ad hoc networks in the research community. Vehicle-to-Vehicle (V2V) communication plays a significant role in providing a high level of safety and convenience to drivers and passengers. Routing in VANET is a major challenge and research area. Position based routing protocol has been identified to be suitable for VANETs because of frequently changed network topology and highly dynamic nature of vehicular nodes. Many position based routing protocols have been developed for routing messages in greedy orwarding way in VANETs. However, few of them are efficient when the network is highly dynamic. In this paper, we present an overview andqualitative comparison of existing position based routing protocols that are based on the position prediction of neighboring and destination nodes. We evaluate the performance metrics such as end-to-end delay and packet delivery ratio using NS-2 simulator.
Analysis of neighbour and isolated node of intersection area based geocasting protocol (IBGP) in VANET
Sanjoy Das,D . K. Lobiyal
Computer Science , 2012,
Abstract: Geocasting is a special variant of multicasting, where data packet or message is transmitted to a predefined geographical location i.e., known as geocast region. The applications of geocasting in VANET are to disseminate information like, collision warning, advertising, alerts message, etc. In this paper, we have proposed a model for highway scenario where the highway is divided into number of cells. The intersection area between two successive cells is computed to find the number of common nodes. Therefore, probabilistic analysis of the nodes present and void occurrence in the intersection area is carried out. Further, we have defined different forwarding zones to restrict the number of participated nodes for data delivery. Number of nodes present and void occurrence in the different forwarding zones have also been analysed based on various node density in the network to determine the successful delivery of data. Our analytical results show that in a densely populated network, data can be transmitted with low radio transmission range. In a densely populated network smaller forwarding zones will be selected for data delivery.
A Performance Analysis of LAR Protocol for Vehicular Ad Hoc Networks in City Scenarios
Sanjoy Das,D. K Lobiyal
Computer Science , 2012,
Abstract: In this paper, performance analysis of Location Aided Routing (LAR) protocol in different city scenarios has been done. The mobility model considered is Manhattan model. This mobility model used to emulate the movement pattern of nodes i.e., vehicles on streets defined by maps. Our objective is to provide a qualitative analysis of the LAR protocol in different city scenarios in Vehicular Ad hoc Networks. We have considered three different city scenarios for the analysis of the protocol. The simulation work has been conducted using the Glomosim 2.03 simulator. The results show that LAR1 protocol achieves maximum packet delivery ratio is 99.68 % and maximum average end-to-end delay is 7.319969 ms when the network is sparsely populated. Further, for densely populated network maximum achieved packet delivery ratio is 87.58% and average end-to-end delay is 0.017684 ms.
Effect of Realistic Vehicular Traces on the Performance of Broadcasting Techniques in Vehicular Ad Hoc Networks
Sanjoy Das,D.K. Lobiyal
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: In this study, performance analysis of different broadcasting methods i.e., flooding and probabilistic broadcasting inside the geocast region has been done. We have considered an urban scenario where radio transmission is obstructed due to presence of high rise buildings, trees and other objects. Our objective is to provide a comparative analysis between flooding and probabilistic methods with varying traffic density and nodes speed in VANET. Different values of probability for probabilistic broadcast method have been considered to investigate an appropriate value that may give best results. To generate real traces of vehicles movement VanetMobiSim is used. The mobility model considered is Intelligent Driver Model with Intersection Management. We have considered different types of traffic conditions based on number of vehicles present in the network in a particular time period are Sparse, Intermediate and Dense. The results obtained shows that in dense traffic scenario probabilistic broadcasting method achieves maximum packet delivery ratio is 83.9412% when p = 0.1. In sparsely populated network the PDR are low as compared to other traffic conditions. The minimum value of PDR obtained is 21.0455% when number of node is 50 and p = 0.8. Simulations have been conducted using the NS-2 simulator and for result analysis used awk programming, Matlab is used.
Analysis of Neighbour and Isolated Node of Intersection Area Based Geocasting Protocol (IBGP) in VANET
Sanjoy Das,D.K Lobiyal
International Journal of Wireless & Mobile Networks , 2012,
Abstract: Geocasting is a special variant of multicasting, where data packet or message is transmitted to a predefined geographical location i.e., known as geocast region. The applications of geocasting in VANET are to disseminate information like, collision warning, advertising, alerts message, etc. In this paper, we have proposed a model for highway scenario where the highway is divided into number of cells. The intersection area between two successive cells is computed to find the number of common nodes. Therefore, probabilistic analysis of the nodes present and void occurrence in the intersection area is carried out. Further, we have defined different forwarding zones to restrict the number of participated nodes for data delivery. Number of nodes present and void occurrence in the different forwarding zoneshave also been analysed based on various node density in the network to determine the successful delivery of data. Our analytical results show that in a densely populated network, data can be transmitted with low radio transmission range. In a densely populated network smaller forwarding zones will be selected for data delivery.
Deterministic and Probabilistic Approach in Primality Checking for RSA Algorithm
Kumarjit Banerjee,Satyendra Nath Mandal,Sanjoy Das
Journal of Theoretical Physics and Cryptography , 2013,
Abstract: The RSA cryptosystem, invented by Ron Rivest, Adi Shamir and Len Adleman was first publicized in the August 1977 issue of Scientific American [1]. The security level of this algorithm very much depends on two large prime numbers [2]. In this paper two distinct approaches have been dealt with for primality checking. These are deterministic approach and probabilistic approach. For the deterministic approach, it has chosen modified trial division and for probabilistic approach, Miller-Rabin algorithm is considered. The different kinds of attacks on RSA and their remedy are also being discussed. This includes the chosen cipher text attacks, short private key exponent attack and frequency attack. Apart from these attacks, discussion has been made on how to choose the primes for the RSA algorithm. The time complexity has been demonstrated for the various algorithms implemented and compared with others. Finally the future modifications and expectations arising out of the current limitations have also been stated at the end.
Study of Dynamic Behavior of Multilayered Clamped Composite Skewed Hypar Shell Roofs under Impact Load
Sanjoy Das Neogi,Amit Karmakar,Dipankar Chakravorty
Journal of Engineering , 2013, DOI: 10.1155/2013/192176
Abstract: With advancement in the field of structural engineering, hunt for smarter materials has channelised the research towards the application of composite material. It is the high specific weight and specific stiffness of this material that have drawn the interest of different industrial sectors. Civil engineers also picked up composites to use it as a roofing material. Laminated composite shells, which can cover large column-free area and reduces dead weight of structure, show vulnerability under sudden impact due to their low transverse shear resistances. This study utilises finite element tool to investigate the dynamic response of a multilayered laminated composite hypar shells for fully clamped boundary condition. This class of shells is unique in a sense that the curvature has only the radius of cross curvature and these shells do not admit easy closed form solution particularly when the boundary conditions are complicated. Contact behavior of impactor and impacted mass has been modeled by modified Hertzian contact law and time-dependent equations are solved using Newmark’s time integration technique. Basic aim is to analyse the shell for symmetrically placed multilayered angle and cross ply lamination under different impact velocities. 1. Introduction Composite material has gained popularity in different industrial sectors. It is the high specific weight and stiffness of this material that have gained the popularity for composite. With other sectors, civil engineering industries also started using the laminated composites as roofing material in the situation where large column-free space is required. The high specific weight also causes reduction in dead weight of structure and thus reduces seismic weight and foundation cost. In spite of these advantages, low transverse shear strength makes them vulnerable under sudden impact. It is obvious that an accurate modeling of contact behavior is one of the most important steps to analyze an impact response problem. The classical contact law between elastic solids derived by Hertz [1] was employed by different authors from time to time. The problem gets more complicated in case of composite materials and the Hertzian contact law which was derived for homogeneous isotropic materials may not be adequate. Tan and Sun [2] undertook an experimental program on a graphite/epoxy laminated plate to establish an empirical indentation law. The theoretical basis of their experiment was checked by a nine-noded plate finite element. Time histories of contact force and displacement were reported by Sun and Chen [3] for
Many-Polaron Effects in the Holstein Model
Sanjoy Datta,Arnab Das,Sudhakar Yarlagadda
Physics , 2004, DOI: 10.1103/PhysRevB.71.235118
Abstract: We derive an effective polaronic interaction Hamiltonian, {\it exact to second order in perturbation}, for the spinless one-dimensional Holstein model. The small parameter is given by the ratio of the hopping term ($t$) to the polaronic energy ($g^2 \omega_0$) in all the region of validity for our perturbation; however, the exception being the regime of extreme anti-adiabaticity ($t/\omega_0 \le 0.1$) and small electron-phonon coupling ($g < 1$) where the small parameter is $t/\omega_0$. We map our polaronic Hamiltonian onto a next-to-nearest-neighbor interaction anisotropic Heisenberg spin model. By studying the mass gap and the power-law exponent of the spin-spin correlation function for our Heisenberg spin model, we analyze the Luttinger liquid to charge-density-wave transition at half-filling in the effective polaronic Hamiltonian. We calculate the structure factor at all fillings and find that the spin-spin correlation length decreases as one deviates from half-filling. We also extend our derivation of polaronic Hamiltonian to $d$-dimensions.
Feasibility Evaluation of VANET using Directional-Location Aided Routing (D-LAR) Protocol
Ram Shringar Raw,Sanjoy Das,Nanhay Singh,Sanjeet Kumar
International Journal of Computer Science Issues , 2012,
Abstract: Vehicular Ad hoc Networks (VANETs) allow vehicles to form a self-organized network without any fixed infrastructure. VANETs have received wide attention and numerous research issues have been identified in the recent time. The design and implementation of efficient and scalable routing protocols for VANETs is a challenging task due to high dynamics and mobility constraints. In this paper, we have proposed D-LAR (Directional-Location Aided Routing), is an extension of Location Aided Routing (LAR) with Directional Routing (DIR) capability. D-LAR is a greedy approach based-position based routing protocol to forward packet to the node present in request zone within the transmission range of the source node as most suitable next-hop node. We have justified the feasibility of our proposed protocol for VANET.
Multifaceted Aspects of Human Cloning
Tanuj Kanchan, T. S. Mohan Kumar*, Ashish Kumar**, Sanjoy Das***
JK Science : Journal of Medical Education & Research , 2006,
Abstract: Not available
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