scholarly journals Virtual Disks Performance Analysis Using Flexible I/O and Powerstat

2021 ◽  
Vol 9 (10) ◽  
pp. 267-296
Author(s):  
Pritam Patange
Keyword(s):  
Cloud Computing ◽  
Virtual Machine ◽  
Virtual Machines ◽  
Disk File ◽  
Virtual Machine Monitor ◽  
Image File ◽  
File Formats ◽  
Physical Infrastructure ◽  
Disk Image ◽  
The Impact

Abstract: Cloud computing has experienced significant growth in the recent years owing to the various advantages it provides such as 24/7 availability, quick provisioning of resources, easy scalability to name a few. Virtualization is the backbone of cloud computing. Virtual Machines (VMs) are created and executed by a software called Virtual Machine Monitor (VMM) or the hypervisor. It separates compute environments from the actual physical infrastructure. A disk image file representing a single virtual machine is created on the hypervisor’s file system. In this paper, we analysed the runtime performance of multiple different disk image file formats. The analysis comprises of four different parameters of performance namely- bandwidth, latency, input-output operations performed per second (IOPS) and power consumption. The impact of the hypervisor’s block and file sizes is also analysed for the different file formats. The paper aims to act as a reference for the reader in choosing the most appropriate disk file image format for their use case based on the performance comparisons made between different disk image file formats on two different hypervisors – KVM and VirtualBox. Keywords: Virtualization, Virtual disk formats, Cloud computing, fio, KVM, virt-manager, powerstat, VirtualBox.

Secure Data Hiding Using Eight Queens Solutions

2012 ◽  
Vol 6 (4) ◽  
pp. 55-70 ◽  
Author(s):  
Sunil Kumar Muttoo ◽  
Vinay Kumar ◽  
Abhishek Bansal
Keyword(s):  
Data Hiding ◽  
Cover Image ◽  
Image File ◽  
File Formats ◽  
Secure Data ◽  
Ascii Code

The 8-queens problem of placing 8 non-attacking queens on an 8x8 chessboard is used to hide message in an image. The method helps in randomizing the bit selection in a cover image for hiding purpose. Cover image is divided into blocks of 8x1 bytes and then masked with solutions of the 8-queens problem. Bits from the block are collected corresponding to the 8-queen solution to make a 7 bit string. LSB of the block is not considered. It gives a number in the range of 0 to 127. If a bit string, corresponding to the 8-queens solutions, matches with ASCII code of the first character from message, the corresponding solution number of the 8-queens problem is encrypted using RC4, and the cipher is stored in first block of the cover. This encrypted value works as key. The solution number corresponding to next character is XORED with the key and the resultant value is embedded in the LSB of next block. The algorithm has been tested with cover of different image file formats like BMP, PNG and TIFF. The algorithm provides very good capacity, imperceptibility and robustness.

Managing multiple medical image file formats and conventions

2003 ◽  
Author(s):  
Scott C. Neu ◽  
Daniel J. Valentino ◽  
Keith R. Ouellette ◽  
Arthur W. Toga
Keyword(s):  
Medical Image ◽  
Image File ◽  
File Formats

scholarly journals A Streaming IO Base Class and Support for Streaming the MRC and VTK File Format

2010 ◽  
Author(s):  
Bradley Lowekamp ◽  
David Chen
Keyword(s):  
File Format ◽  
Image File ◽  
File Formats

This paper describes our contribution of three new classes to the Insight Toolkit community. We present a new ImageIO base class for streaming image file, along with two derived ImageIO classes for the VTK and the MRC file formats.

scholarly journals Quantitative Image Format for Electron Microscopy

2020 ◽  
Vol 26 (S2) ◽  
pp. 1176-1178
Author(s):  
Grigore Moldovan ◽  
Michael Zabel
Keyword(s):  
Electron Microscopy ◽  
Experimental Data ◽  
Quantitative Data ◽  
Data Simulation ◽  
Simulation Data ◽  
Image File ◽  
File Formats ◽  
Quantitative Image ◽  
Image Format ◽  
Calibration Parameters

AbstractExperimental data, simulation, data analysis and visualisation require image file formats that are open source and able to contain and manage quantitative data. Quantification techniques bring the new challenge of managing image calibration parameters and formulas in an open and efficient format, compatible with routine microscopy workflows. A practical approach to quantitative image format is presented and discussed here, relying on open and extensible file formats - Tagged Image File (TIF) and Extensible Metadata Platform (XMP).

Ripple: a program to collect and analyze digital topographic sequences

2006 ◽  
Vol 39 (3) ◽  
pp. 466-467
Author(s):  
Jeffrey J. Lovelace ◽  
Gloria E. O. Borgstahl
Keyword(s):  
User Interface ◽  
Graphical User Interface ◽  
Modular Design ◽  
Simple Addition ◽  
Image File ◽  
File Formats ◽  
Microsoft Windows

A Microsoft Windows-based system calledRipplehas been developed to drive a digital topography camera and to collect and analyze a sequence of topographic images. It has a graphical user interface, is easy to use and can be parasitically installed at existing beamlines. The modular design allows for the simple addition of detectors, detector image file formats, triggers and motion controllers.

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