Now a day's large amount of digital information such as video, audio or image is spread over the internet. So it should be a great challenge for all researchers to provide security to such a type of digital data. Also the piracy and copyright is emerging issue when digital information in the form of video, audio & image is transmitted over the transmission media. So to prevent the problem of piracy and security of digital data such as video, video watermarking techniques has been introduced. There are various watermarking schemes to give the security to videos but they were unable to provide the quality in terms of robustness and security. In this paper optimized and hybrid based robust digital video watermarking scheme has been proposed. The optimization is performed in the proposed system with the help of genetic algorithm. The quality of the proposed watermarking scheme is measured in terms of PSNR and NC values. The PSNR calculated using our approach is off 50.48 db which is far better than existing approaches.

Optimized and hybrid based watermarking system for digital video security

The aim is to propose a system based on encryption of compressed video bit streams and hiding privacy information to protect videos during transmission using H.264/AVC. To maintain security and privacy video needs to be stored and processed in an encrypted format. Here, data hiding is done directly in the encrypted version of H.264/AVC which includes the following three parts i.e, H.264/AVC video encryption, data embedding and data extraction. choas encryption is used to encrypt/decrypt the secret data before/after data embedding/extraction. The simulated results shows that the methods used provide better performance interms of computation efficiency, high data security and video quality after decryption. The parameters such as mean square error, peak signal to noise ratio, correlation and structure similarity index are evaluated to measure its efficiency.

An efficient security for privacy information through hiding data in encrypted compressed videobit streams

In the mechanical design constituent, numerical simulations method is mostly used for design instauration (or modification) and design optimisation. In the nowadays aim of work the first stage rotor leaf sword of a two-stage gas turbine has been analyzed for steady state thermal using ANSYS 16.2 an attempt has been investigated the effect of temperature on the turbine blade. A steady state thermal analysis has been carried out to investigate the focal point of the temperature flow rate which is been develops due to the thermal loading. An attempt is also made to suggest the best material for a turbine blade by comparing the results obtained for three different stuff such as Copper, Titanium and Nickel that has been considered for the analysis. The blade is modelled with SolidWorks 2015. The geometric model of the blade profile is generated with mathematically and extruded to get a solid model. In this work after finding the suitable materials, the analysis of different diam of hole also investigated. For different hole diameter, it has been pointed out that if the diameter of the hole is increased gradually with the constant number of holes, then the maximum temperature value and the total heat flux distribution decreases, then it grows again. Therefore, this present work the suitable diameter of hole also has been suggested for better performance in future.

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Thermal analysis of gas turbine rotor blade using finite element analysis

The gas turbine obtains its power by utilizing the energy of burnt gases and the air which is at high temperature and pressure by expanding through the several rings of fixed and moving blades. Since the turbine blades are working at high temperature and pressure there are extreme stresses developed on turbine blades. The first centrifugal stresses act on the blade due to high angular speeds, and second is thermal stresses that arise due to temperature gradient within the blade material. The present paper is review of various analyses done on turbine blades and there are various factors effects on turbine blade. This paper will be helpful for those who are working in the area of power plants.

Naveen Kumar Sahu

Papers

Thermal analysis of gas turbine rotor blade using finite element analysis

A Review of Gas Turbine Rotor Blade Design