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A Fuzzy based Routing Protocol for Delay Tolerant Network
Neelam Malik,Shailender Gupta,Bharat Bhushan 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.1
Delay Tolerant Network (DTN) is a wireless ad hoc network that intends to provide communication between pair of nodes in spite of having intermittent connectivity and long delays. The nodes are buffer and energy constrained. To provide communication in such scenario, a sturdy routing mechanism is needed. In this paper we propose a new routing technique based on fuzzy logic for intermittently connected network. Also an effort has been made to evaluate the performance of the proposed routing strategy in realistic environment (having obstacles) in MATLAB. The simulation results show that the performance of the network is improved using fuzzy logic based routing strategy and the results of realistic environment are quite different from idealistic environment.
An In-depth Analysis of Various Steganography Techniques
Sangeeta Dhall,Bharat Bhushan,Shailender Gupta 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.8
The Steganography is an art and technique of hiding secret data in some carrier i.e. image, audio or video file. For hiding data in an image file various steganography techniques are available with their respective pros and cons. Broadly these techniques are classified as Spatial domain techniques, Transform domain techniques, Distortion techniques and Visual cryptography. Each technique is further classified into different types depending on their actual implementation. This paper is an effort to provide comprehensive comparison of these steganography techniques based on different Performance Metrics such as PSNR, MSE, MAE, Intersection coefficient, Bhattacharyya coefficient, UIQI, NCD, Time Complexity and Qualitative analysis. For this purpose a simulator is designed in MATLAB to implement above said techniques. The techniques are compared based on performance metrics..
Enhancement of Spectrum Efficacy using Cognitive Radio Networks
Vivek Kukreja,Shailender Gupta,Bharat Bhushan,Poonam Mittal,C. K. Nagpal 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.2
Spectrum is the most valuable and scarce resource for every wireless application. Due to the scarcity of the spectrum other alternatives are also being searched. Cognitive Radio (CR) technology is one such alternative which has gained popularity in the recent times. It has been established from various researches that the allocated band is not in use for all the time by the licensed user or as Primary Users (PUs). The Cognitive Radio users also called as Secondary Users (SUs) communicate using unlicensed band or by using the idle licensed band of primary users opportunistically. This paper evaluates the performance of routing protocols by varying concentration level of PU and SU. We have also investigated the impact of time given by PU’s to SU’s for data transfer. For performing the above task, a simulator is designed in MATLAB-7.01. The results show that the performance of routing protocols improves significantly as the number of PUs and allowable time given by PU’s to SU’s increases.
A Hybrid Defogging Technique based on Anisotropic Diffusion and IDCP using Guided Filter
Pranjal Garg,Shailender Gupta,Bharat Bhushan,Prem Chand Vashist 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.7
In poor weather condition, fog removal from an image is an unavoidable problem. Various methods have been proposed in literature for de-hazing of image based on Dark Channel Prior (DCP) such as Improved Dark Channel Prior (IDCP), Anisotropic Diffusion and IDCP method using Guided Filter. This paper provides a hybrid strategy based on IDCP using Guided Filter and Anisotropic Diffusion method. The former strategy is used for estimating and refining transmission map while the later is used to estimate and refine airlight. In addition, this paper compares the above mentioned techniques using several performance metrics such as Normalized Color difference (NCD), Color Naturalness Index (CNI) and number of saturated pixel. The results shows that the visual quality of our hybrid approach is much better as well as the performance metrics mentioned above optimizes to a great extent.