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International conference on Recent Trends in Information technology

作者： Anjanadevi, S. Vijayakumar, D. Srinivasagan, K. G. Natl Engn Coll Autonomous Dept Comp Sci & Engn PG Kovilpatti India

ISBN: (纸本)9781479949892

Cloud computing is an emerging, computing model wherein the tasks are allocated to software, combination of connections, and services accessed over a network. This connections and network of servers is collectively known as the cloud. In place of operating their own data centers, users might rent computing power and storage capacity from a service provider and pays only for what they use. Cloud storage is delivering the data storage as service. If the data is stored in cloud, it must provide the data access and heterogeneity. With the advances in cloud computing it allows storing of large number of images and data throughout the world. This paper proposes the indexing and metadata management which helps to access the distributed data with reduced latency. The metadata management can be enhanced for large scale file system applications. When designing the metadata, the storage location of the metadata and attributes is important for the efficient retrieval of the data. Indexes are used to quickly locate data without having to search over every location in storage. Based on these two models, the data can be easily fetched and the search time was reduced to retrieve the appropriate data.

关键词： Metadata Cloud storage Index Google File System Hadoop Distributed File System

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Where technology Meets Security: Key storage and data Separation for System-on-Chips 44

Where Technology Meets Security: Key Storage and Data Separa...

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44th IEEE European Solid State Circuits conference (ESSCIRC)

作者： Sigl, Georg Gross, Mathieu Pehl, Michael Tech Univ Munich Dept Elect & Comp Engn Munich Germany AISEC Fraunhofer Inst Appl & Integrated Secur Munich Germany

ISBN: (纸本)9781538654040

This article investigates the dependency between advances in chip technology, architectures, and security. Two major properties of secure systems are analyzed in this context: data separation of different applications and secure storage of cryptographic keys. We discuss first examples for compromising data separation, e.g. the Rowhammer attack on modern DRAMs, enabled by the sensitivity of shrinked DRAM cells for crosstalk effects, or Meltdown and Spectre attacks using cache side channels. These attacks show the dependency between data separation and advances in technology and architecture. Even more powerful attacks exploiting bus and network-on-chip traffic are possible. Another area where technology meets security is the storage of cryptographic keys. New technologies offer new ways to realize non-volatile memory (NVM) for secret data storage and to implement physical unclonable functions (PUFs), which generate the key during system start and do not store it permanently in NVM. To enable good PUFs, technology and security people should work together as early as possible in the development phase, since PUFs must be characterized carefully. Ideally a PUF module is provided as a characterized and reliable security primitive in the design library. If we manage to take security already into account in early technology development phases and during architecture definition, we will get more secure systems-on-chip in the future.

关键词： Task analysis Security Nonvolatile memory Secure storage Random access memory Arrays

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Aggregation induced emission molecule applied in optical data storage

Aggregation induced emission molecule applied in optical dat...

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Information storage System and technology, ISST_2019

作者： Luo, Zhijun Liu, Yanan Chen, Menglin Gan, Zongsong Xie, Chang-Sheng Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan Hubei430074 China Key Laboratory of Education Ministry for Information Storage Systems Huazhong University of Science and Technology Wuhan Hubei430074 China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen Guangdong518057 China

In high density optical data storage, we propose the stimulated emission depletion method to imaging the data dots beyond the diffraction limitation, where the dots contain aggregation induced emission molecule. ©... 详细信息

ISBN: (纸本)9781943580729

关键词： optical data storage

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Research on the writing and reading method of 3D digital storage.

Research on the writing and reading method of 3D digital sto...

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conference on optical storage technology

作者： Ma, LJ Xu, DY Pan, LF Tsing Hua Univ Dept Precis Instruments Beijing 100084 Peoples R China

In this paper, a writing and reading method of 3D optical digital storage is presented. The novel method is based on dual photon-absorption effective and multi-layer distribution of data.. The potential problems of th... 详细信息

ISBN: (纸本)0819430234

关键词： 3D optical storage optical disc photon absorption

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Key technology for high density rewritable DVD (DVD-RAM)

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IEEE TRANSACTIONS ON MAGNETICS 1998年第2期34卷 337-342页

作者： Satoh, I Ohara, S Akahira, N Takenaga, M Matsushita Elect Ind Co Ltd Opt Disc Syst Dev Ctr Osaka 571 Japan

DVD-RAM requires a large storage capacity to write and read huge amounts of data such as MPEG2 and AV as well as computer data for full-scale multi-media applications. Its format is focused on unifying AV and computer files, and achieving read compatibility with DVD-ROM drive. DVD-RAM has been realized by using phase change media, 0.6 mm substrate, 650 nm laser and NA 0.6 lens. The track has a single-spiral wobbled land and groove format. Each sector in land and groove tracks can be accessed in a seamless manner by combining physical headers and the wobble signal. 8-16 modulated signal is overwritten on land and groove tracks with mark edge recording method, The sector position shifting of 8 bytes and two guard fields located at the top and end of the data field are introduced to prevent the signal deterioration caused by repeating overwrites. DVD-RAM disc has wide tolerances of laser power and disc tilt, and overwrite durability of over 10(5) cycles. It is also concluded that DVD-RAM is high reliable and compatible for reading by DVD-ROM drives.

关键词： DVD optical recording Read-write memory optical sensors Phase change materials optical films Lenses Costs Disk recording Audio recording

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Plasmon nano-optical tweezers

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NATURE PHOTONICS 2011年第6期5卷 349-356页

作者： Juan, Mathieu L. Righini, Maurizio Quidant, Romain ICFO Inst Ciencies Foton Barcelona 08860 Spain ICREA Barcelona 08010 Spain

Conventional optical tweezers, formed at the diffraction-limited focus of a laser beam, have become a powerful and flexible tool for manipulating micrometre-sized objects. Extending optical trapping down to the nanometre scale would open unprecedented opportunities in many fields of science, where such nano-optical tweezers would allow the ultra-accurate positioning of single nano-objects. Among the possible strategies, the ability of metallic nanostructures to control light at the subwavelength scale can be exploited to engineer such nano-optical traps. This Review summarizes the recent advances in the emerging field of plasmon-based optical trapping and discusses the details of plasmon tweezers along with their potential applications to bioscience and quantum optics.

关键词： nature photonics Nature Photonics nature publishing group content journal optoelectronics optics biophotonics quantum optics cryptography spectroscopy terahertz technology light propagation lasers LEDs photovotaics fibre optics optical data storage

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Multilayer multilevel storage testing system

Multilayer multilevel storage testing system

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conference on Advanced optical storage technology

作者： Zhao, H Qi, GS Xu, DY Mai, XS Zhang, L Tsing Hua Univ Dept Precis Instrument & Mech Beijing 100084 Peoples R China

ISBN: (纸本)0819447196

A novel storage system is introduced which bases on the "multilayer multilevel storage model". Three kinds of lasers that are different in wavelength are used to record data or test some storage material in this system. An example that is testing the photochromic material is also introduced to explain the usage of the system in testing storage material.

关键词： multilayer multilevel disc photochronomism multilayer storage multilevel storage material tester data storage

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optical Inter Satellite Links for Broadband Networks 9

Optical Inter Satellite Links for Broadband Networks

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9th International conference on Recent advances in Space Technologies (RAST)

作者： Motzigemba, Matthias Zech, Herwig Biller, Philipp TESAT Spacecom GmbH Backnang Germany

ISBN: (纸本)9781538694480

Inter Satellite Links (ISL) are essential to connect Satellites operating in a constellation. If these ISLs could manage high data rates in Gigabit per seconds the network becomes a broadband connectivity services. New possibilities for data exchange and independencies from ground networks are offered. LEO satellite constellations with low latency of data streaming, are very attractive as a backhaul infrastructure to connect people worldwide like a Space based Internet or to address Internet of Things (IoT) applications on a global scheme. optical Inter-Satellite Links (OISL) combine very high data rates with resilient performance. Due to its narrow beam and a coherent detection technology without beacons, these OISLs a very robust. As the optical beams are much narrower than RF beams, no interference with other potential optical communication systems will occur and thus offer high operational security and immunity to interference sources, jamming and eavesdropping. An obvious advantage of the optical ISL is the fact that the frequency usage is not regulated by ITU, which makes the planning and operation of a navigation constellation much easier. OISLs are realized by Laser Communication Terminals (LCT) on each end of the link. The technology readiness of Laser Communication Terminals is TRL9. This paper gives an overview on the current status and on the future developments of Laser communication terminals in the various applications.

关键词： Laser Communication optical Inter Satellite Links LCT DTE data relay LEO constellations

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Current trends in multi-dimensional optical data storage technology

Current trends in multi-dimensional optical data storage tec...

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2016 Asia Communications and Photonics conference, ACP 2016

作者： Zhang, J. Čerkauskaité, A. Drevinskas, R. Patel, A. Beresna, M. Kazansky, P.G. Qichang Optics Co. Ltd. 430070 China Optoelectronics Research Centre University of Southampton SO17 1BJ United Kingdom

optical data storage, renowned for its low energy consumption features, is an ideal candidate for data archiving. The major challenge is the lack of appropriate combination of storage technology and medium possessing ... 详细信息

ISBN: (纸本)9781728116327;9780960038008

关键词： optical data storage

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data Modelling for Discrete Time Series data Using Cassandra and MongoDB 3

Data Modelling for Discrete Time Series Data Using Cassandra...

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3rd IEEE International conference on Recent advances in Information technology (RAIT)

作者： Ramesh, Dharavath Sinha, Ashay Singh, Suraj Indian Sch Mines Dept Comp Sci & Engn Dhanbad 826004 Bihar India

ISBN: (纸本)9781479985791

With the current emphasis on big data and its applications, the NoSQL databases have surged in popularity. One of the possible application of the NoSQL databases is the efficient storage of discrete time series data. Cassandra, because of its sequential data storage mechanism and MongoDB, because of its flexible schema and rich query language are ideal fits for storing discrete time series data. In this paper, we present a few data modelling schemes in Cassandra and MongoDB to store the discrete time series data.

关键词： NoSQL Cassandra MongoDB Time Series Distributed Systems

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