Current Issue : July - September Volume : 2016 Issue Number : 3 Articles : 4 Articles
The aim of this study is to present different types of steganography in brief and to give a special attention to audio steganography technique because a huge number of audio files are exchanged through the networks. Nowadays the widening of attacker's abilities to access the private and public information transmitted over public communication system makes way for highlighting a tool that guarantees the secure transmission of hidden information. Information hiding was a common security term that mainly includes three techniques: cryptography, steganography and watermark. Cryptography was an ancient form that is used for confidential data. Steganography is a popular tool that uses digital medium to hide confidential data in innocent carrier such as image, audio, text and video. Steganography is in fact a complement for the earlier data hiding technique cryptography. However watermark is used for copyright protection. Audio steganography is technique that hides any type of secret data in cover audio file. This study also discusses the main requirements of steganography methods and how those methods achieve them. Furthermore it shows steganography domain and, carriers and information hiding techniques used in audio....
Precise measurement of mechanical forces is crucial\nto efficient micro-manufacturing. The quality of such\nmeasurements depends heavily on the properties of the\nnoise inevitably accompanying every measurement process.\nIn the micro-range, the signal-to-noise ratio tends to be very\nlow, and the noise dynamic varies for different frequencies.\nIn result, common denoising methods that assume white\nnoise perform poorly in this setting. In this paper, a novel,\neasily implementable denoising method based on a local\nstatistic of the measured data�s spectrum is proposed. By\ntesting it on a representative dataset, it is shown that the\nproposed method is robust and stable. Particularly, it allows\nfor an efficient retrieval of the force signal encountered in\nmicro-milling processes....
In order to achieve the nonsmooth surface drag reduction structure on the inner polymer coating of oil and gas pipelines and\nimprove the efficiency of pipeline transport, a structuralmodel of the machining robot on the pipe inner coating is established. Based\non machining robot, an experimental technique is applied to research embossing and coating problems of rolling-head, and then\nthe molding process rules under different conditions of rolling temperatures speeds and depth are analyzed. Also, an orthogonal\nexperiment analysis method is employed to analyze the different effects of hot-rolling process apparatus on the embossed pits\nmorphology and quality of rolling.The results also reveal that elevating the rolling temperature or decreasing the rolling speed can\nalso improve the pit structure replication rates of the polymer coating surface, and the rolling feed has little effect on replication\nrates. After the rolling-head separates from the polymer coating, phenomenon of rebounding and refluxing of the polymer coating\noccurs, which is the reason of inability of the process. A continuous hot-rolling method for processing is used in the robot and the\nhot-rolling process of the processing apparatus is put in a dynamics analysis....
Smart grid is defined as the overlaying of a unified communications and control\nsystem onto the existing power delivery infrastructure to provide the right\ninformation and the right entity at the right time. It helps even out demand spikes\nand uses resource mix more efficiently. It is a better integration, or ââ?¬Å?system\nbalancing,ââ?¬Â of variable resources, like wind power. Many of the advanced applications\nof smart grid are expected to develop in an evolutionary manner based on current\ntechnologies available and the needs of the market, for example, electric vehicles\n(EVs) or plug-in hybrid electric vehicles (PHEVs). It is likely that we will see a simpler\nassociated application (i.e., smart battery charger) before the market matures to\nsupport a more complex form of the application vehicle-to-grid (V2G). The objective\nof this paper is to develop a technology roadmapping (TRM) process for smart\nelectric V2G technologies in Oregon and the Pacific Northwest (PNW). The research\nfocuses on the application of V2G in the residential chargers. It introduces the\nmarket drivers, products, and technology analysis and also provides research on the\nnecessary resources needed within R&D in the coming years (next 10 years)....
Loading....