scholarly journals Study of storage devices properties for steganographic data hiding in cluster file systems

Radiotekhnika ◽  
2020 ◽  
pp. 109-120
Author(s):  
K.Yu. Shekhanin ◽  
Yu.I. Gorbenko ◽  
L.O. Gorbachova ◽  
A.A. Kuznetsov
Keyword(s):  
File Systems ◽  
Information Storage ◽  
Test Results ◽  
Storage Devices ◽  
Random Cluster ◽  
Storage Media ◽  
Hide Information ◽  
Modern Information ◽  
Storage Technologies ◽  
Cluster File

Methods for technical steganography have been developed in recent years. Hiding of information in such systems is achieved by using properties artificially created by human while constructing various technical means. An example of technical steganography is the application of the features of constructing clustered file systems. This makes it possible to hide information effectively by changing the alternation of individual clusters, the so-called сover files. The names of such files are the key information and it is extremely difficult to recover a hidden message without links (i.e. without names) of cover files. This work describes and analyzes various modern information storage technologies, namely HDD, Flash-USB, SSD. We have analyzed different indicators such as the number of implemented products, price, speed of reading and writing. The important indicators of storage media efficiency with regard to steganographic methods of hiding information in cluster file systems were also analyzed. For example, we have investigated the speed of sequential reading / writing and the speed of access to a random cluster that is similar to the speed of access to a fragmented file. For this, we used the test results from the UserBenchmark resource. Tests were performed using Sequential and Random4k methods. In conclusion, an assessment of information carriers is given and recommendations are given on using the method of hiding data by mixing clusters in the structure of the file system.

scholarly journals Characterizing Synchronous Writes in Stable Memory Devices

2019 ◽  
Author(s):  
William B. Mingardi ◽  
Gustavo M. D. Vieira
Keyword(s):  
Distributed Algorithms ◽  
Random Access ◽  
File Systems ◽  
Buffer Size ◽  
Memory Devices ◽  
Recovery Model ◽  
Profile Data ◽  
Storage Devices ◽  
Storage Technologies ◽  
Stable Memory

Distributed algorithms that operate in the fail-recovery model rely on the state stored in stable memory to guarantee the irreversibility of operations even in the presence of failures. The performance of these algorithms lean heavily on the performance of stable memory. Current storage technologies have a defined performance profile: data is accessed in blocks of hundreds or thousands of bytes, random access to these blocks is expensive and sequential access is somewhat better. File system implementations hide some of the perfor- mance limitations of the underlying storage devices using buffers and caches. However, fail-recovery distributed algorithms bypass some of these techniques and perform synchronous writes to be able to tolerate a failure during the write itself. Assuming the distributed system designer is able to buffer the algorithm’s writes, we ask how buffer size and latency complement each other. In this paper we start to answer this question by characterizing the performance (throughput and latency) of typical stable memory devices using a representative set of current file systems.

Room-temperature Ferromagnetism in Two-dimensional Transition Metal Borides: A First-principles Investigation

2021 ◽  
Author(s):  
Fang Wu ◽  
Min Dou ◽  
Huan Li ◽  
Yunfei Liu ◽  
Qingnian Yao ◽  
...  
Keyword(s):  
Transition Metal ◽  
First Principles ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Ferromagnetic Materials ◽  
Information Storage ◽  
Two Dimensional ◽  
Storage Media ◽  
Metal Borides ◽  
Generation Information

It is important to predict new two-dimensional (2D) ferromagnetic materials for next-generation information storage media. However, discovered 2D ferromagnetic materials are still rare. Here, we explored that 2D transition metal...

The modernization of information services in the People's Republic of China

1981 ◽  
Vol 3 (5) ◽  
pp. 227-233 ◽  
Author(s):  
K.P. Broadbent
Keyword(s):  
National Development ◽  
Information Storage And Retrieval ◽  
Information Services ◽  
Written Language ◽  
Information Storage ◽  
Republic Of China ◽  
Storage And Retrieval ◽  
Modern Information ◽  
Role Of Information

China has suffered from over a decade of turmoil which has prevented the development of modern information ser vices. Present policy stresses the role of information storage and retrieval in national development. Apart from technical and political constraints, China faces a serious handicap with its unique written language, where the 5000 plus characters needed to express scientific and technical concepts are too large to be handled cost-effectively by present computers. This report outlines ways in which China is currently attempt ing to meet these problems and provide for modern informa tion services by the end of the decade.

scholarly journals Improvement in the diffraction efficiency of a polymer using an ionic liquid

2018 ◽  
Vol 83 (2) ◽  
pp. 213-220
Author(s):  
Sung Kim ◽  
Pankaj Attri ◽  
In Kim
Keyword(s):  
Diffraction Efficiency ◽  
Information Storage ◽  
Polymer Mixture ◽  
Dihydrogen Phosphate ◽  
Storage Devices ◽  
Dpss Laser ◽  
Photosensitive Polymer ◽  
Diode Pumped ◽  
First Time ◽  
532 Nm

In this paper, photosensitive materials for information storage devices are presented. The polymers were prepared using surface relief-grating (SRG) fabrication with a diode-pumped solid-state (DPSS) laser of 532 nm, and the diffraction efficiency (DE) of the polymers were assessed with a low-power DPSS laser at 633 nm. However, the diffraction efficiency of the azo-functionalized epoxy-based polymer was low, even after 15 min of exposure. To improve the efficiency and reduce the time it takes for the DE measurements of the photosensitive polymer, the polymer was combined ionic liquids (ILs). Various ILs, i.e., 1-methylimidazolium chloride ([Mim]Cl) from the imidazolium family of ILs and diethylammonium dihydrogen phosphate (DEAP), triethylammonium 4-aminotoluene-3-sulfonic acid (TASA) and tributylmethylammonium methyl sulphate (TBMS) from the ammonium family of ILs, were investigated. For the first time, it was observed that DE dramatically increased the DEAP?polymer mixture in 4 min compared to the polymer (alone) and other polymer?IL mixtures. Therefore, DEAP IL could help improve the efficiency of DE measurements in a shorter time.

SIMULATION OF DESIGN COMPONENTS OF POWER SUPPLY SYSTEMS FOR PERSONAL COMPUTERS

2021 ◽  
pp. 8-13
Author(s):  
А.Н. Юров ◽  
Д.В. Цымбал
Keyword(s):  
Personal Computer ◽  
Power Supply ◽  
Pulsed Power ◽  
Power Supply Unit ◽  
Information Storage ◽  
Stable Operation ◽  
Assembly Model ◽  
Storage Devices ◽  
Linear Programming Methods ◽  
Supply Systems

Предложена разработка цифрового макета изделия, который представляет собой компонент ЭВМ - импульсный блок питания. Производится анализ предполагаемых компонентов персонального компьютера, которые будут установлены в систему. При необходимости есть возможность выбора с добавлением новых компонентов в системный блок ЭВМ. После определения заданных компонентов ПК производится расчет мощности, которая нужна для получения стабильной работы системы в целом. По произведенным расчетам выполняется 3D-моделирование блока питания с разъемами для подключения материнской платы, видеокарты, а также прочих устройств, в том числе и накопителей информации. В работе исследованы вопросы по применению методов линейного программирования для решения поставленных задач в соответствии с исходными данными, а также подходы по получению 3D-модели источника питания с построенными трассами до разъемов подключения устройств и компонентов персонального компьютера. Кроме того, подготовлено программное обеспечение, в котором визуально представлен процесс построения сборочной модели БП согласно произведенным расчетам We propose the development of a digital model of the product, which is a computer component - a pulsed power supply. We carried out the analysis of the expected components of the personal computer that will be installed in the system. If necessary, there is a choice with the addition of new components to the system unit of the computer. After determining the specified PC components, the power is calculated, which is needed to obtain stable operation of the system as a whole. According to the calculations made, 3D-modeling of the power supply unit with connectors for connecting the motherboard, video card, as well as other devices, including information storage devices, is performed. The paper investigates the issues of using linear programming methods for solving the assigned tasks in accordance with the initial data, as well as approaches to obtaining a 3D model of a power supply with constructed routes to the connectors for connecting devices and components of a personal computer. In addition, we prepared the software, in which the process of building an assembly model of a power supply unit is visually presented according to the calculations

Cluster File Systems

2011 ◽  
pp. 289-289
Author(s):  
Guy L. Steele ◽  
Xiaowei Shen ◽  
Josep Torrellas ◽  
Mark Tuckerman ◽  
Eric J. Bohm ◽  
...  
Keyword(s):  
File Systems ◽  
Cluster File
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