检索结果-内蒙古大学图书馆

Pattern analysis for tilt servo control in holographic data storage system

MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOsystems-information STORAGE AND processing systems 2012年第9-10期18卷 1677-1692页

作者： Kim, Jang Hyun Yang, Hyunseok Kim, Nakyeong Jeong, Wooyoung Park, Jin Bae Yonsei Univ Dept Mech Engn Seoul 120749 South Korea Yonsei Univ Dept Elect & Elect Engn Seoul 120749 South Korea Yonsei Univ Ctr Informat Storage Device Seoul 120749 South Korea

Today many media of information storage device are formed as disks. Hence, next generation removable data storage media are shaped as disk types too. The holographic data storage system also uses a disk type photopolymer media. And then, holographic data storage system is most advanced optical memory system. In 1948, Dennis Gabor made the insightful observation that the phase formation in a diffracted wavefront could be recorded by interference with a coherent background. It was not until the early 1960s with the invention of the laser that the technology became practical for storing and retrieving images, and the concepts of holographic data storage were established by van Heerden. In his seminal paper in 1963 on the theory of optical information storage in solids, van Heerden postulated that the recording of interference patterns in a three-dimensional medium could be used as a means of storing and retrieving information (Holographic data storage, Springer, New York, 2000). Tracking servo and tilt servo control are very important research in holographic data storage system. In this paper, we propose intelligent servo control by fuzzy rules in holographic data storage system. Hence, we have found pattern of tilt servo control in holographic data storage system through fuzzy system. Fuzzy rules were generated by subtractive clustering algorithm for controlling tilt servo. Therefore, we control tilt servo using fuzzy rules in holographic data storage system. Consequently, practical pattern of tilt servo control was found by intelligence algorithm in holographic data storage system (Holographic data storage, Springer, New York, 2000).

关键词： HOLOGRAPHIC storage devices (Computer science) optical disk drives COMPUTER interfaces FUZZY systems SYSTEM analysis COMPUTER algorithms

来源：评论

学校读者我要写书评

暂无评论

TV Remote Control Using Human Hand Motion Based on optical Flow System

TV Remote Control Using Human Hand Motion Based on Optical F...

引用

12th International conference on Computational Science and Its Applications (ICCSA)

作者： Jeong, Soonmook Song, Taehoun Kwon, Keyho Jeon, Jae Wook Sungkyunkwan Univ Sch Informat & Commun Engn Suwon South Korea

ISBN: (纸本)9783642311369;9783642311376

Motion recognition systems have been widely developed in the field of human computer interaction. Methods, such as pointing, dynamic gesture and static gesture or hand held devices have been proposed for motion recognition. The motion recognition systems have been gradually adapted to home appliances in our daily. In this paper, we focus on TV interaction, since the device is a recent representative multimedia device applying the motion technique. Most motion recognition systems utilize 3D data, such as horizontal, vertical and depth information by stereo camera or ToF (Time of Flight) camera. However, this paper proposes the different techniques for human-TV interaction. We propose an optical flow based motion recognition system that provides direction and speed, in addition to the position of the moving target in real time. These factors are useful in recognizing human motion more effectively and more dynamically. Therefore, we design the natural interaction for human-TV using these motion data. The calculation process of optical flow is outside the scope of this paper. This real time optical flow calculation is implemented using the FPGA chip supporting parallel processing by a hardware team in our laboratory. We propose a method for human motion recognition based on real time optical flow system.

关键词： Motion recognition Human-TV Interaction optical flow Natural interaction Real-time system

来源：评论

学校读者我要写书评

暂无评论

Novel EO/IR sensor technologies

Novel EO/IR sensor technologies

引用

conference on Infrared Sensors, devices, and Applications and Single Photon Imaging II

作者： Lewis, Keith Sciovis Ltd Malvern WR14 2TE Worcs England

ISBN: (纸本)9780819487650

The requirements for advanced EO/IR sensor technologies are discussed in the context of evolving military operations, with significant emphasis on the development of new sensing technologies to meet the challenges posed by asymmetric threats. The Electro-Magnetic Remote Sensing (EMRS DTC) was established in 2003 to provide a centre of excellence in sensor research and development, supporting new capabilities in key military areas such as precision attack, battlespace manoeuvre and information superiority. In the area of advanced electro-optic technology, the DTC has supported work on discriminative imaging, advanced detectors, laser components/technologies, and novel optical techniques. This paper provides a summary of some of the EO/IR technologies explored by the DTC.

关键词： Sensors Polarimetry Target detection Cameras Imaging systems Sensor technology Staring arrays Detection and tracking algorithms Image processing Target recognition

来源：评论

学校读者我要写书评

暂无评论

High-Resolution Digital Zooming Using a Fisheye Lens and Geometric Compensation

High-Resolution Digital Zooming Using a Fisheye Lens and Geo...

引用

IEEE International conference on Consumer Electronics (ICCE 2011)

作者： Kim, Donggyun Kang, Wonseok Paik, Joonki Chung Ang Univ Grad Sch Adv Imaging Sci Multimedia & Film Image Proc & Intelligent Syst Lab Seoul 156756 South Korea

ISBN: (纸本)9781424487127

A computational camera uses unconventional optics and digital signal processing software to produce new forms of visual information [1]. This paper presents a computational camera approach to near-lossless, high-quality digital zooming employed in compact comsumer's imaging devices result in severe distortions in output images due to the limited amount of information. In spite of such limited quality, the digital zooming function is equipped in many inexpensive cameras because of its desirable properties such as compactness, low power consumption, and low cost. In order to overcome the limited quality of the conventional digital zooming system, we use a fisheye lens with appropriate digital image processing algorithms. For realization of the proposed computational camera-based digital zooming, we first generate intput test images using a commercial optical simulator. We then calibrate the fisheye lens using a special rectangular grid patterns. Finally, we remove the barrel distortion in the output of the fisheye lens, and crop an appropriate size of rectangular region in the center. Experimental results indicate that the proposed computational camera-based digital Zooming system can significantly increase the resolution of output images compared with con ventional digital zooming systems, especially at magnification ratio of 3 or higher.

关键词： Digital signal processing

来源：评论

学校读者我要写书评

暂无评论

Effect of magnetite nanoparticles doped glass with enhanced Verdet constant for magnetic optical current transducer applications

Effect of magnetite nanoparticles doped glass with enhanced ...

引用

International conference on Advanced Materials and information Technology processing (AMITP 2011)

作者： Chen, Qiuping Wan, Lin Chen, Qiuling Zhang, Meng Politecn Torino Dept Mat Sci & Chem Engn Corso Duca Abruzzi 24 I-10129 Turin Italy Luoyang Inst Sci & Technol Luoyang Peoples R China Henan Univ Technol Zhengzhou Peoples R China

ISBN: (纸本)9783037851579

Fe3O4 nanoparticles were synthesized and doped into two glass systems (Na2O-B2O3 glass and PbO-Bi2O3-B2O3-GeO2 glasses) at low concentrations using traditional glass melting method. The formation of Fe3O4 nanoparticles was obtained through coprecipitation of Fe(II) and Fe(iii) in alkaline *** size of the Fe3O4 nanoparticles was observed to be around 15 nm. The structure and properties of doped glasses were studied by X-ray diffraction (XRD), scanning electric microscope (SEM), UV-VIS spectray, FT-IR spectray analysis and Faraday rotation test. Compared to the host glass, Fe3O4 nanoparticles doped glasses shown enhanced Faraday Effect in term of Verdet constant and will have potential application in magneto-optical devices.

关键词： Fe3O4 Nanoparticles Magneto optical glass Verdet constant Magneto optical current transducer

来源：评论

学校读者我要写书评

暂无评论

Effect of magnetite nanoparticles doped glass with enhanced Verdet constant for magnetic optical current transducer applications

Effect of magnetite nanoparticles doped glass with enhanced ...

引用

The 2011 International conference on Advanced Materials and information Technology processing(AMITP 2011)

作者： Qiuping Chen Lin Wan Qiuling Chen Meng Zhang Department of Material Sciences and Chemical Engineering Politecnico di TorinoCorso duca degli Abruzzi2410129Italy Luoyang institute of Science and Technology Henan University of Technology

ISBN: (纸本)9783037851579

Fe3O4 nanoparticles were synthesized and doped into two glass systems(Na2O-B2O3 glass and Pb O-Bi2O3-B2O3-Ge O2 glasses) at low concentrations using traditional glass melting method. The formation of Fe3O4 nanoparticles was obtained through coprecipitation of Fe(II) and Fe(iii) in alkaline *** size of the Fe3O4 nanoparticles was observed to be around 15 nm. The structure and properties of doped glasses were studied by X-ray diffraction(XRD), scanning electric microscope(SEM), UV-VIS spectray, FT-IR spectray analysis and Faraday rotation test. Compared to the host glass, Fe3O4 nanoparticles doped glasses shown enhanced Faraday Effect in term of Verdet constant and will have potential application in magneto-optical devices.

关键词： Fe3O4 Nanoparticles,Magneto optical glass,Verdet constant,Magneto optical current transducer

来源：评论

学校读者我要写书评

暂无评论

A system calibration and fast iterative reconstruction method for next-generation SPECT imagers

A system calibration and fast iterative reconstruction metho...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Brian W. Miller Roel Van Holen Harrison H. Barrett Lars R. Furenlid Center for Gamma-Ray Imaging and the College of Optical Sciences University of Arizona Tucson Tucson AZ USA Department of Electronics and Information Systems Ghent University Ghent Belgium

Recently, high-resolution gamma cameras have been developed with detectors containing >; 10 5 -10 6 elements. SPECT imagers based on these detectors usually also have a large number of voxel bins and therefore face memory storage issues for the system matrix when performing fast tomographic reconstructions using iterative algorithms. To address these issues, we have developed a method that parameterizes the detector response to a point source and generates the system matrix on the fly during MLEM or OSEM on graphics hardware. The calibration method, interpolation of coefficient data, and reconstruction results are presented in the context of a recently commissioned small-animal SPECT imager, called FastSPECT iii.

关键词： Lead Graphics processing unit Image reconstruction Single photon emission computed tomography

来源：评论

学校读者我要写书评

暂无评论

Scalable quantum information processing and the optical topological quantum computer

引用

OPTICS AND SPECTROSCOPY 2010年第2期108卷 267-281页

作者： Devitt, S. Natl Inst Informat Chiyoda Ku Tokyo 1018430 Japan

optical quantum computation has represented one of the most successful testbed systems for quantum information processing. Along with ion-traps and nuclear magnetic resonance (NMR), experimentalists have demonstrated control of qubits, multi-gubit gates and small quantum algorithms. However, photonic based qubits suffer from a problematic lack of a large scale architecture for fault-tolerant computation which could conceivably be built in the near future. While optical systems are, in some regards, ideal for quantum computing due to their high mobility and low susceptibility to environmental decoherence, these same properties make the construction of compact, chip based architectures difficult. Here we discuss many of the important issues related to scalable fault-tolerant quantum computation and introduce a feasible architecture design for an optics based computer. We combine the recent development of topological cluster state computation with the photonic module, simple chip based devices which can be utilized to deterministically entangle photons. The integration of this operational unit with one of the most exciting computational models solves many of the existing problems with other optics based architectures and leads to a feasible large scale design which can continuously generate a 3D cluster state with a photonic module resource cost linear in the cross sectional size of the cluster.

关键词： Fault tolerance

来源：评论

学校读者我要写书评

暂无评论

Integrated photonic crystal networks with coupled quantum dots

Integrated photonic crystal networks with coupled quantum do...

引用

conference on Advances in Photonics of Quantum Computing, Memory, and Communication iii

作者： Faraon, Andrei Majumdar, Arka Englund, Dirk Lin, Ziliang Vuckovic, Jelena Stanford Univ Edward L Ginzton Lab Stanford CA 94305 USA

ISBN: (纸本)9780819480071

Single InAs quantum dots can be used to control the transmission function of photonic crystal cavities, as we have already shown for systems that operate both in strong and weak coupling regime. Here we present our most recent work on devices where the cavity is connected in a micron-scale optical network via multiple photonic crystal waveguides terminated with input and output optical couplers. This architecture allows for multiple signal and control beams to be coupled simultaneously in the cavity via distinct ports. The devices are equipped with two input ports where the waveguides are terminated with input grating-couplers that allow for coupling into the waveguide from an out-of-plane direction. A third waveguide coupled to the cavity is terminated with a different kind of grating out-coupler that allows for improved directional scattering of the light transmitted through the cavity. We have already shown in previous experiments with a single cavity with coupled quantum dots, that this system acts as a highly nonlinear medium that enables all optical switching at powers down to the single photon level. In our most recent experiments we take significant steps towards demonstrating that this switching can be done in integrated structures, as needed for optical signal processing devices for both classical and quantum information science.

关键词： quantum information photonic crystal quantum dot quantum networks

来源：评论

学校读者我要写书评

暂无评论

Active and passive nanophotonics for information systems applications

Active and passive nanophotonics for information systems app...

引用

Frontiers in Optics, FiO 2010

作者： Fainman, Y. Simic, A. Bondarenko, O. Slutsky, B. Mizrahi, A. Nezhad, M.P. Dept. of Electrical and Computer Engineering University of California San Diego 9500 Gilman Drive La Jolla CA 92093-0407 United States

Advances in nanoscale fabrication techniques in dielectric and metallic material systems has opened up new opportunities in photonics and plasmonics for solving long standing problems in information systems and telecommunication systems. Optics in general has the potential to solve some of the most demanding problems in information systems. It promises crosstalk-free interconnects with essentially unlimited bandwidth, long-distance data transmission without skew and without power- and time-consuming regeneration, miniaturization, parallelism, and efficient implementation of important algorithms such as Fourier transforms. Numerous information processing systems and concepts in space and time have been studied during the past decades. Yet, optical computing and processing in space and time has so far failed to move out of the lab. The current optical technology is costly, bulky, fragile in their alignment, and difficult to integrate with electronic systems, both in terms of the fabrication process and in terms of delivery and retrieval of massive volumes of data the optical elements can process. Our most recent work emphasizes the construction of optical subsystems directly on-chip, with the same lithographic tools as the surrounding electronics. This has been made possible by the advances in these tools, which can now create features significantly smaller than the optical wavelength; experts predict lithographic resolution as fine as 16nm by year 2020. Arranged in a regular pattern, subwavelength features act as a metamaterial whose optical properties are controlled by the density and geometry of the pattern and its constituents [1-5].

关键词： Electron beam lithography Fourier transforms Multiple quantum wells optical elements optical properties Whispering gallery modes Lasers and laser optics (140.0140) Laser resonators (140.3410) Microcavity devices (140.3948)

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：