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检索条件"任意字段=Conference on Advances in Optical Data Storage Technology"

共 5078 条记录，以下是4921-4930 订阅

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Fourier analysis of high-index-contrast slab waveguide with step discontinuity: An analytical and exact solution

Fourier analysis of high-index-contrast slab waveguide with ...

引用

IEEE PhotonicsGlobal@Singapore, IPGC

作者： Yijing Chen Yong Ma Yicheng Lai Yingyan Huang Seng-Tiong Ho Data Storage Institute Agency for Science Technology and Research Singapore EECS Department Northwestern University Evanston IL USA

We propose a novel technique based on Fourier analysis and perturbation theory to describe completely the step discontinuity in a slab waveguide of any index contrast without the need for analytical approximations or assumptions. Through this technique, we derive a spectral overlapping criterion and a coupling matrix that analyzes effectively the roles of the radiation modes in the resultant computation accuracy. A symmetric nano-waveguide with 55.9% index contrast is investigated under normal incident light condition along TE polarization. The total reflectance and the guided power reflectivity are computed at the waveguide-air interface. Results obtained are consistent with the FDTD simulation and only requires very short computational time.

关键词： optical waveguides Waveguide discontinuities Couplings Transmission line matrix methods Reflectivity Slabs Approximation methods

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Enumeration algorithms for constructing (d/sub 1/, /spl infin/, d/sub 2/, /spl infin/) run length limited arrays: capacity estimates and coding schemes

Enumeration algorithms for constructing (d/sub 1/, /spl infi...

引用

IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： S.G. Srinivasa S.W. McLaughlin School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta USA

We present two enumeration algorithms for a class of (d/sub 1/, /spl infin/, d/sub 2/, /spl infin/) run-length limited (RLL) constrained arrays. Based on the structure of these algorithms, we derive bounds for the maximum information rate of the constraint. We also give encoders and decoders for coded 2D constrained arrays with rates close to the derived bounds.

关键词： Holographic optical components Information rates Decoding Holography data storage systems Two dimensional displays Random processes Entropy Merging Writing

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New advances for wireless remote condition monitoring in tunnel deformation and track tilt

New advances for wireless remote condition monitoring in tun...

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6th IET conference on Railway Condition Monitoring (RCM 2014)

作者： Simon Maddison Bryn Smith Senceive Ltd. United Kingdom

Wireless sensor network systems as supplied by Senceive are now totally accepted as a cost effective, precise and reliable tool for the condition monitoring of rail, geo-technical and structural assets. They are providing for remote monitoring of assets through the use of low cost, battery powered, high precision, self-configuring wireless sensor systems which can be readily installed with a minimum of effort. They also, of course, avoid the need for wiring or indeed, in the case of optical systems, the need for frequent cleaning and extensive set-up and configuration. Far reaching development over the past 2-3 years, part funded by the TSB (technology Strategy Board) has led to a highly significant step change in functionality by Senceive in wireless RCM including: battery life extended to over 10 years and the provision of industrial levels of network robustness and data stability. Additionally, and as a direct reflection of this success over recent years, Senceive's wireless systems alone have also been approved and extended into two new important and challenging asset classes: Rail Tunnels and Track Bed.

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Why To Model Remote Sensing Measurements In 3d? Recent advances In Dart: Atmosphere, Topography, Large Landscape, Chlorophyll Fluorescence And Satellite Image Inversion

Why To Model Remote Sensing Measurements In 3d? Recent Advan...

引用

International conference on Advanced Technologies for Signal and Image Processing (ATSIP)

作者： J.P. Gastellu-Etchegorry Y. Wang O. Regaieg T. Yin Z. Malenovsky Z. Zhen X. Yang Z. Tao L. Landier A. Al Bitar Deschamps N. Lauret J. Guilleux E. Chavanon B. Cao J. Qi A. Kallel Z. Mitraka N. Chrysoulakis B. Cook D. Morton Université de Toulouse CESBIO - UPS CNES CNRS IRD Toulouse France Earth System Science Interdisciplinary Center University of Maryland College Park MD 20740-3823 USA School of Technology Environments and Design University of Tasmania Hobart Australia College of Geo-Exploration Science and Technology Jilin University Changchun China Chinese Academy of Sciences Institute of Remote Sensing and Digital Earth Beijing China Key Laboratory of Geographical Information Science East China Normal University Shanghai China CNES 18 Av. Belin Toulouse France Beijing Forestry University Beijing China CRNS ATMS Sfax Tunisia Foundation for Research and Technology Hellas (FORTH) Heraklion Greece NASA Goddard Space Flight Center Greenbelt USA

ISBN: (数字)9781728175133

ISBN: (纸本)9781728175140

Remote sensing (RS) dedicated to the study of land surfaces benefits from more and more advanced sensors. However, the interpretation of RS data is often is often inaccurate due to the complexity of the observed land surfaces. Therefore, RS models, in particular physical models, that simulate RS observations of the three-dimensional (3D) landscapes are critical to correctly interpret RS data. DART is one of the most comprehensive 3D models of Earthatmosphere optical radiative transfer (RT), from ultraviolet (UV) to thermal infrared (TIR). It simulates the optical signal of proximal, aerial and satellite imaging spectrometers and laser scanners, the 3D RB and solar-induced chlorophyll fluorescence (SIF) signal, for any urban or natural landscape and any experimental or instrument configuration. It is freely available for research and teaching activities (***). After illustrating three significant sources of inaccuracy in RS interpretation, five recent DART advances are presented: RT in the atmosphere and topography, fast RS image simulation of large landscapes, SIF modelling, and satellite image inversion.

关键词： Atmospheric modeling Three-dimensional displays Reflectivity Surface topography Sun Forestry Solid modeling

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Improving the Table Boundary Detection in PDFs by Fixing the Sequence Error of the Sparse Lines

Improving the Table Boundary Detection in PDFs by Fixing the...

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International conference on Document Analysis and Recognition

作者： Ying Liu Kun Bai Prasenjit Mitra C. Lee Giles College of Information Sciences and Technology Pennsylvania State University University Park PA USA

ISBN: (纸本)9781424445004

As the rapid growth of PDF documents, recognizing the document structure and components are useful for document storage, classification and retrieval. Table, a ubiquitous document component, becomes an important information source. Accurately detecting the table boundary plays a crucial role for many applications, e.g., the increasing demand on the table data search. Rather than converting PDFs to image or HTML and then processing with other techniques (e.g., OCR), extracting and analyzing texts from PDFs directly is easy and accurate. However, text extraction tools face a common problem: text sequence error. In this paper, we propose two algorithms to recover the sequence of extracted sparse lines, which improve the table content collection. The experimental results show the comparison of the performance of both algorithms, and demonstrate the effectiveness of text sequence recovering for the table boundary detection.

关键词： data mining Information analysis Image converters HTML optical character recognition software Image analysis Filtering Text analysis Computer errors Educational institutions

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The advances in the Carbon Source/Sink Researches of Typical Grassland Ecosystem in China

The Advances in the Carbon Source/Sink Researches of Typical...

引用

2011 3rd International conference on Environmental Science and Information Application technology(ESIAT 2011)

作者： Chengcheng GANG Jie ZHANG Jianlong LI College of Life Science Nanjing University

With the deepening research of global change, studies of carbon cycle of grassland ecosystem, one of the widely distributed vegetation type, is of great significance in estimating global carbon cycle. Grassland degradation and desertification caused by human activities(such as land reclamation and grazing etc) is becoming increasingly serious in our country, so it is urgency to study the effects of human on grassland soil carbon. Under the condition of increasing measuring precision and region density, it is superior to use remote sensing in grassland carbon storage measurement through acquisition and inversion vegetation information and related biophysics parameters, it is possible to monitor the space distribution of grassland carbon-fixed amount in large range and multi-scale timely and accurately. In this paper, the importance of carbon cycle of grassland ecosystem was discussed, and researches on carbon cycle of grassland ecosystem in China was summarized and analysed, including the three carbon pools(plants carbon pool, litterfall carbon pool and soil carbon pool), effects of natural or human activities on carbon storage and methods to estimate the carbon storage. Additionally, based on the principal of grass growth, together with analysis of various global ecosystem NPP estimation methods, we put forward a novel thought to establish an carbon estimation model and testify its accuracy with meteorological data and field observation data such as grassland biomass, NPP, net ecological productivity(NEP) etc, which is much more suitable for carbon source/sink estimation of grassland ecosystem in China. At last, the existing problems and prospects of carbon source/sink researches of main grassland in China were discussed.

关键词： grassland ecosystem carbon source/sink carbon pools grassland classification integrated data method

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Distortion correction method in the high-precision and high-speed CCD measurement system

Distortion correction method in the high-precision and high-...

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Chinese Control conference (CCC)

作者： Jing Li Junzheng Wang Renjian Hao Key Laboratory of Complex System Intelligent Control and Decision School of Automation Beijing Institute of Technology 100081 China

In the high-precision and high-speed measurement system, the distortion of CCD pixes will give a greater margin of error to measurement results. According to the characteristic of noise leading to the image distortion, this article establishes the image transformation model. data fitting based method is used for correcting image distortion. For the distortion caused by camera installation, the perspective transformation is used to correcting the image. And then the four points calibration method is adopted to calibrating the measurement system. Experiments adopt the high speed area array CCD to gather images with the circular facula in the target area launched by the laser, and calculate the real position of the facula in the target area, adopt the high accurate displacement sensor to give the true displacement of the target which is used to verify the real position of the facula in the target area. The results show that the algorithm can reduce the influence of image distortion, which advances the measurement accuracy efficiently.

关键词： Charge coupled devices Distortion measurement optical distortion Cameras Measurement uncertainty Calibration Real-time systems

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Microring optimization for the tunable vortex beam emitter

Microring optimization for the tunable vortex beam emitter

引用

International conference on Laser Optics

作者： G.S. Voronkov L.I. Bakirova School of Photonics Engineering and Research Advances (SPhERA) Ufa University of Science and Technology Ufa Russia

ISBN: (数字)9798350390674

ISBN: (纸本)9798350390681

Light beams bearing orbital angular momentum (OAM) are perspectives in different applications, including communication and sensing systems, chemistry, and microbiology. One can apply the topological charge control to improve information security or to provide an additional orthogonal basis to speed the data exchange up. Detecting OAM changes may help measure the solid rotation parameters or atmospheric turbulence. Our work presents a novel method for optimizing the micro-ring resonator (MRR) as a vortex beam emitter with tunable OAM order. We added the periodic structure to the ring waveguide to transform the whispering gallery modes into radiation modes. Depositing phase change material Sb 2 Se 3 on the ring waveguide provided us with an instrument to control the OAM order. This material changes its refractive index when switching from an amorphous phase (for this case, the refractive index equals 3.285) to crystalline (here, the refractive index reaches 4.050). All values are given the wavelength 1550 nm. This material also has another advantage: the zero imaginary part of the refractive index provides low optical loss. We optimized the MRR to provide the radiated energy’s maximum flux density and to keep the radiated power constant on the OAM switching, which helps us avoid the parasitic amplitude modulation of an optical beam. We also show some analytical approaches to simplify the simulation complexity. One can easily apply the proposed approach to optimize optical beam emitters carrying OAM for various applications.

关键词： Waveguide transitions Atmospheric measurements optical switches Refractive index optical resonators Transforms Whispering gallery modes

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Millimeter-wave main memory-to-processor data bus

Millimeter-wave main memory-to-processor data bus

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2010 11th International conference on Electronic Packaging technology & High Density Packaging(2010 电子封装技术与高密度封装国际会议)

作者： Gee-Kung Chang Arshad Chowdhury Shu-Hao Fan Daniel Guidotti Hung-Chang Chien Tianyi Guo School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia 303 Institute of Microelectronics of the Chinese Academy of Sciences Chaoyang District Beijing 100029

The mainstreaming of chip multiprocessor (CMP) architectures exact a profound impact on valuable resources, for example, L3 cache capacity, off-chip bandwidth and on-board main memory capacity. Even with latency-hiding software strategies, in a memory-starved system, a processor can remain idle for several decades of clock cycles and performance will degrade [1]. Two hardware solutions are being developed for opening the memory bottleneck;(1) Stack bare SRAM die memory, with multiplexer-demultiplexer, using through-silicon vias and place the SRAM stacks around the multi-core processor at the multi-chip carrier level [2] to increase L3 capacity and, in addition, also stack dynamic random access memory (DRAM) dies on board to increase main memory capacity needed for numerically intensive and storage intensive computations. We propose a third option consisting of a wireless data bus, operating in the millimeter wave (mmW) band, which can provide “fetch” and “put” operations between processors and DRAM memory with unprecedented bandwidth. Digitally coded (mmW) are used to transfer data between antenna arrays by means of near field coupling. The main design targets are as follows: (1) single channel throughput 20-40 Gb/s, in a 5-10 GHz frequency bandwidth using 60-90 GHz carrier waves and QPSK and 8PSK symbol coding. data bandwidth scaling is accomplished by symbol coding, at the expense of greater power dissipation, and is independent of materials. (2) 64 bi-directional channels in the ～ 4 x 4 cm2 A proposed system architecture and antenna design are discussed. Results of near field data transfer experiments using Vivaldi radiators and discrete modular components are summarized. footprint of a packaged processor for an aggregate data rate of 160-320 GB/s. (3) A globally distributed optical clock from an off-board modulated laser provides the correlated, self tracking clock to synchronize memory transfers and provides the local oscillator (LO) port signal to each transmi

关键词： Bandwidth Integrated optics optical amplifiers Electrodes Copper Antenna arrays Radio frequency

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A GIS-BASED INFORMATION SHARING INFRASTRUCTURE FOR CONTAINER PORT LOGISTICS USING data MINING AND VISUAL technology

A GIS-BASED INFORMATION SHARING INFRASTRUCTURE FOR CONTAINER...

引用

International technology and Innovation conference 2006

作者： SHU Fan, XU Ziqi, HUANG Youfang, MI Weijian Logistics Engineering School, Shanghai Maritime University, Shanghai 200135, China

Owing to advances of container port logistics in today's globalized economy, the competitive edge of container ports has shifted to information management paradigm for the purpose of cost- and time-efficiency. However, an effective yet systematic information sharing strategy, in terms of information acquisition, processing, communication, storage, display and analysis, has not been well addressed. In order to resolve this impact, a novel logistics information system, i.e. a GIS-based information-sharing infrastructure, is postulated and established based on the closed-loop control modeling. In details, it comprises three interacting modules, namely input module, output module and feedback module. In the input module, the GIS-based logistics information is first acquired and processed, and then stored in a database. Subsequently, the information is analyzed and displayed via the output module. As for the feedback module, the information is consequently fed back to adjust some indices, so as to adapt to the entire system optimization and coordination. On account of sharing information through this infrastructure, an in-depth strategy is developed to integrate data mining and visualization using such as virtual reality (VR) and analysis tool-kits. Finally, a case study on Tianjing Container Port is used to illustrate and validate this approach. It is accordingly envisaged that the proposed GIS-based information-sharing infrastructure can effectively facilitate and expedite the container port operation process.

关键词： Container port logistics, information sharing infrastructure, geographical information system, control modeling, data mining and visualization.

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