In order to study the vibration characterization of a spindle motor, the rotor runout must be measured accurately. In this paper, a method based on measurement uncertainty is presented to evaluate different measuremen...
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In order to study the vibration characterization of a spindle motor, the rotor runout must be measured accurately. In this paper, a method based on measurement uncertainty is presented to evaluate different measurement systems and measurement confidence. The principle optic interferometer (iRVM) system is introduced in this paper, which is based on optical interference technology. The results of the iRVM are compared with another two methods that make use of capacitance probe and laser Doppler velocimetry.
A new optical card without pre-formatted pattern and tracking servo is proposed. An optical read/write system has been constructed and its stable operation verified. It is expected that this system will be further ref...
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ISBN:
(纸本)0819403717
A new optical card without pre-formatted pattern and tracking servo is proposed. An optical read/write system has been constructed and its stable operation verified. It is expected that this system will be further refined as micro-optics technologyadvances.
opticaldatastorage is now well into the second decade of continuing market and technology expansion. Media removability, whish is the main attribute of this technology, presented the optical recording industry with ...
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ISBN:
(纸本)0819437204
opticaldatastorage is now well into the second decade of continuing market and technology expansion. Media removability, whish is the main attribute of this technology, presented the optical recording industry with unmatched opportunities and also new challenges. On the one hand, data interchange between the media and drives from different sources becomes a major concern, which can only be solved if international standards for all optical recording disk/cartridge are available. Many standards organizations, with the help of world wide industrial support, took up the challenge, and numerous international standards were established which are now being adapted. One the other hand, copy protection technology must be developed to prevent illegal copying and distribution of contents using this removable media. This need is accentuated by the proliferation of low cost CD and now DVD disks replication means and the availability of recordable and rewritable CD and DVD devices. This paper provides an update of the brief summary of the current status of the international optical disk standards published ealier(1) and a breif review of the copy protection technology.
This paper presents an all-optical code preserving encoder and decoder. The proposed encoder and decoder serve to preserve the code in between the communication channel for enhanced security of binary data. It is desi...
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ISBN:
(纸本)9789811016783;9789811016776
This paper presents an all-optical code preserving encoder and decoder. The proposed encoder and decoder serve to preserve the code in between the communication channel for enhanced security of binary data. It is designed using the XGM effect in SOAs. The communication includes encoder and decoder simulations and results are evaluated in terms of logic received and Extinction ratio of systems. The encoder and decoder are verified to preserve the code appropriately.
We present issues related to the architecture of a document archiver using optical disk technology. In particular we examine the problems of data placement in the optical disk, storage hierarchies, data duplication an...
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We present issues related to the architecture of a document archiver using optical disk technology. In particular we examine the problems of data placement in the optical disk, storage hierarchies, data duplication and version control. Simulation results and analytical results are presented. These results are used to analyze the effect of various design decisions on the performance of such a system.
The massive data puts forward higher requirements on the capacity of storage devices, but from a practical point of view, the increasement of capacity is far more behind the growth of data. Deduplication technique, fo...
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ISBN:
(纸本)9783319387710;9783319387697
The massive data puts forward higher requirements on the capacity of storage devices, but from a practical point of view, the increasement of capacity is far more behind the growth of data. Deduplication technique, for its high efficiency, few resource consumption and extensive application scope, comes to the fore among various data reduction techniques. The so-called data deduplication refers to find and eliminate redundant data among the storage system. For local storage system, the only one data object is needed to store to save limited storage space;for network system, not only storage space can be saved, but also transmission bandwidth can be reduced to increase the transmission rate. It is a compromise to achieve the purpose of efficient storage at cost of computational overhead. This article will introduce data deduplication techniques, describe basic principles and processes, summarize the main technique of the current study and provide recommendations for future development.
Polymer-TCNQ(tetracyanoquinodimethane) charge transfer complexes were synthesized using organic polycations as electron donor, These materials are soluble in organic solvents and spin coatable. The materials are spin ...
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Polymer-TCNQ(tetracyanoquinodimethane) charge transfer complexes were synthesized using organic polycations as electron donor, These materials are soluble in organic solvents and spin coatable. The materials are spin coated on polycarbonate substrate with aluminium reflecting layer, and their optical memory effects ate tested at 830nm. With the recording power of 8mW and recording speed of 1. 2m/s, the maximum CNR(carrier to noise ratio) of 40dB was observed.
Cloud computing is a technology which supplies a shared pool of configurable IT resources such as network, software and database. Cloud Computing provides the facility of centralized datastorage, user can access thei...
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A minimized optical lens head for dual-beam super-resolution opticalstorage system which is based on Stimulated Emission Depletion (STED)-like process with Petabyte data capacity is proposed. The whole bulky optical ...
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ISBN:
(纸本)9781538683781
A minimized optical lens head for dual-beam super-resolution opticalstorage system which is based on Stimulated Emission Depletion (STED)-like process with Petabyte data capacity is proposed. The whole bulky optical path is simplified to a customized metasurface with a diameter of 50m, which generates a focused Gaussian beam and a donut beam overlapped perfectly in space. The specially designed lens head offers a distinct performance of chromatic aberration-free design with adaptability to multiple dual-beam combinations.
Rapid technological advances and the increasing use of social media has caused a tremendous increase in the generation of digital data, a fact that imposes nowadays a great challenge for the field of digital data stor...
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ISBN:
(数字)9781728164571
ISBN:
(纸本)9781728164571
Rapid technological advances and the increasing use of social media has caused a tremendous increase in the generation of digital data, a fact that imposes nowadays a great challenge for the field of digital datastorage due to the short-term reliability of conventional storage devices. Hard disks, fiash, tape or even opticalstorage have a durability of 5 to 20 years while running data centers also require huge amounts of energy. An alternative to hard drives is the use of DNA, which is life's information-storage material, as a means of digital datastorage. Recent works have proven that storing digital data into DNA is not only feasible but also very promising as the DNA's biological properties allow the storage of a great amount of information into an extraordinary small volume for centuries or even longer with no loss of information. In this work we present an extended end-to-end storage workflow specially designed for the efficient storage of images onto synthetic DNA. This workflow uses a new encoding algorithm which serves the needs of image compression while also being robust to the biological errors which may corrupt the encoding.
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