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Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 2005

作者： Sharma, V. Suzuki, K. Kowalevicz Jr., A.M. Minoshima, K. Fujimoto, J.G. Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 NTT Photonics Laboratories NTT Corporation 3-1 Morinosato-Wakamiya Atsugi Kanagawa 243-0198 Japan National Institute of Advanced Industrial Science and Technology AIST Tsukuba Central 3 1-1-1 Umezono Tsukuba Ibaraki 305-8563 Japan

Three-dimensional photonic devices are fabricated in glass using high energy femtosecond pulses from an extended cavity Ti: sapphire laser oscillator. Splitters and directional couplers can be fabricated using novel t... 详细信息

ISBN: (纸本)0780392426

关键词： Micromachining

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Carrier Transport in One-dimensional Ge Nanowires/Si Substrate Heterojunctions

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MRS Online Proceedings Library 2005年第1期832卷 285-290页

作者： Eun-Kyu Lee Boris V. Kamenev Pavel A. Forsh Ted I. Kamins Leonid Tsybeskov Electrical and Computer Engineering New Jersey Institute of Technology Newark USA Physics Department Moscow State University Moscow Russian Federation Quantum Science Research Hewlett-Packard Laboratories Palo Alto USA

Samples of Ge Nanowires (Ge NWs) grown by chemical vapor deposition (CVD) on single crystal, (100) and (111) oriented Si substrates were studied with respect to their electrical properties. Using different contact geometries, direct current (DC) and alternating current (AC) electrical and photoelectrical measurements were carried out at room temperature. A rectifying junction behavior was observed indicating a low defect density at NWs/substrate heterointerface. AC conductance exhibits significant frequency dependence with a power law behavior, suggesting that carrier transport in Ge NW volume is associated with hopping processes.

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A Distributed Architecture for a Ubiquitous RFID Sensing Network

A Distributed Architecture for a Ubiquitous RFID Sensing Net...

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Intelligent Sensors, Sensor Networks and Information Processing Conference (ISSNIP)

作者： D.C. Ranasinghe K.S. Leong M.L. Ng D.W. Engels P.H. Cole Auto-ID Laboratories Schoool of Electrical and Electronic Engineering University of Adelaide SA Australia Auto-ID Laboratories Department of Mathematics and Computer Science Massachusetts Institute of Technology Cambridge MA USA

The concept of a "Networked Physical World" originated from the Auto-ID Center, now called the Auto-ID Labs. Such a system can be realized with a combination of automatic identification technology and a ubiquitous computer network that will glue the physical world together. The ability to form a ubiquitous network of physical objects has a wide range of applications including manufacturing automation, supply chain management and collection of sensor derived data We describe the building block system components of a distributed ubiquitous RFID network aimed at enabling ubiquitous sensing with RFID and explore the data flows within the system.

关键词： Radiofrequency identification Sensor phenomena and characterization Temperature sensors Ubiquitous computing Supply chain management computer network management Intelligent networks Product codes Control systems computer architecture

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Micromachining three dimensional photonic devices using a high pulse energy femtosecond laser oscillator

Micromachining three dimensional photonic devices using a hi...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： V. Sharma K. Suzuki A.M. Kowalevicz K. Minoshima J.G. Fujimoto Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA NTT Photonics Laboratories NTT Corporation Atsugi Kanagawa Japan National Institute of Advanced Industrial Science and Technology AIST Tsukuba Ibaraki Japan

Three-dimensional photonic devices are fabricated in glass using high energy femtosecond pulses from an extended cavity Ti:sapphire laser oscillator. Splitters and directional couplers can be fabricated using novel th... 详细信息

Three-dimensional photonic devices are fabricated in glass using high energy femtosecond pulses from an extended cavity Ti:sapphire laser oscillator. Splitters and directional couplers can be fabricated using novel three-dimensional geometries not possible using planer fabrication.

关键词： Micromachining Optical pulses Oscillators Ultrafast optics Waveguide lasers Optical device fabrication Optical waveguides Ultrafast electronics Glass Pulse amplifiers

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A multi-faceted approach towards spam-resistible mail

A multi-faceted approach towards spam-resistible mail

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Pacific Rim International Symposium on Dependable Computing

作者： Ming-Wei Wu Yennun Huang Shyue-Kung Lu Ing-Yi Chen Sy-Yen Kuo Department of Electrical Engineering National Taiwan University Taipei Taiwan AT and T Research Laboratories Florham Park NJ USA Department of Electronic Engineering Fu Jen Catholic University Taipei Taiwan Department of Computer Science and Information Engineering National Taipei University of Technology Taipei Taiwan

As checking spam became part of our daily life, unsolicited bulk e-mails (UBE) have become unmanageable and intolerable. Bulk volume of spam e-mails delivering to mail transfer agents (MTAs) is similar to the effect of denial of services (DDoS) attacks as it dramatically reduces the dependability and efficiency of networking systems and e-mail servers. Spam mails may also be used to carry viruses and worms which could significantly affect the availability of computer systems and networks. There have been many solutions proposed to filter spam in the past. Unfortunately there is no silver bullet to deter spammers and eliminate spam mails. That is, in isolation, each of existing spam protection mechanisms has its own advantages and disadvantages. In this paper, we analyze the shortcomings of existing anti-spam solutions and propose a multi-faceted approach using the spam-resistible mail agent (SRMA), which provides the most advantages and the least disadvantages of existing anti-spam solutions. Our experiments show that the proposed SRMA is immune to existing spambots and the prototype proves to be effective, feasible and deployable.

关键词： Postal services Electronic mail computer crime Network servers Unsolicited electronic mail computer viruses computer worms computer networks Filters Silver

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Inverse kinematics learning for robotic arms with fewer degrees of freedom by modular neural network systems

Inverse kinematics learning for robotic arms with fewer degr...

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2005 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： E. Oyama T. Maeda J.Q. Gan E.M. Rosales K.F. MacDorman S. Tachi A. Agah National Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki Japan Human and Information Science Laboratory NTT Communication Science Laboratories Atsugi Kanagawa Japan Department of Computer Science University of Essex Colchester UK Department of Adaptive Machine Systems Osaka University Suita Osaka Japan School of Engineering University of Tokyo Bunkyo Tokyo Japan Department of Electrical Engineering and Computer Science University of Kansas Lawrence KS USA

Artificial neural networks have been traditionally employed to learn and compute the inverse kinematics of a robotic arm. However, the inverse kinematics model of a typical robotic arm with joint limits is a multi-valued and discontinuous function. Because it is difficult for a multilayer neural network to approximate this type of function, an accurate inverse kinematics model cannot be obtained by using a single neural network. In order to overcome the difficulties of inverse kinematics learning, we propose a novel modular neural network system that consists of a number of expert modules, where each expert approximates a continuous part of the inverse kinematics function. The proposed system selects one appropriate expert whose output minimizes the expected position/orientation error of the end-effector of the arm. The system can learn a precise inverse kinematics model of a robotic arm with equal or more degrees of freedom than that of its end-effector. However, there are robotic arms with fewer degrees of freedom, where the system cannot learn their precise inverse kinematics model. We have adopted a modified Gauss-Newton method for finding the least-squares solution to address this issue. Through the modifications presented in this paper, the improved modular neural network system can obtain a precise inverse kinematics model of a general robotic arm.

关键词： Kinematics Robots Arm Neural networks Artificial neural networks Multi-layer neural network computer networks Newton method Least squares methods Recursive estimation

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Evaluation of a quantum cascade laser as local oscillator for heterodyne detection of THz radiation

Evaluation of a quantum cascade laser as local oscillator fo...

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Optical Terahertz science and technology, OTST 2005

作者： Adam, A.J.L. Hovenier, J.N. Klaassen, T.O. Hajenius, M. Gao, J.R. Williams, B.S. Kumar, S. Hu, Q. Reno, J.L. Kavli Institute of NanoScience Delft University of Technology P.O. Box 5046 2600 GA Delft Netherlands Kavli Institute of NanoScience Delft University of Technology P.O. Box 5046 2600 GA Delft Netherlands SRON National Institute for Space Research Sorbonnelaan 2 3584 CA Utrecht Netherlands Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States Sandia National Laboratories Albuquerque NM 87185-0601 United States

The optical properties of a 2.8 THz QCL are reported and evaluated to investigate the applicability of such a source as local oscillator for THz heterodyne detection. Preliminary results pumping a Hot Electron Bolomet... 详细信息

ISBN: (纸本)1557527865

关键词： Heterodyne detection

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100-nm cascaded hybrid doped fiber amplifier for coarse wavelength division multiplexing

100-nm cascaded hybrid doped fiber amplifier for coarse wave...

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Optical Fiber Communication (OFC) Conference

作者： S.S.-H. Yam Y. Akasaka Y. Kubota H. Inoue Department of Electrical and Computer Engineering Queen's University Kingston ONT Canada Sprint Advanced Technology Laboratories Burlingame CA USA Central Glass Company Limited Tokyo Japan Institute of Industrial Science University of Tokyo Meguro Tokyo Japan

A hybrid amplifier spanning from 1468-1568 nm is constructed by cascading a thulium-doped fiber amplifier pumped at 690 nm and 1400 nm and a cerium co-doped high concentration wideband erbium-doped fiber amplifier.

ISBN: (纸本)1557527849

关键词： Doped fiber amplifiers Wavelength division multiplexing Erbium-doped fiber amplifier Optical fiber amplifiers Stimulated emission Fiber nonlinear optics Optical pumping Semiconductor optical amplifiers Broadband amplifiers Optical scattering

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Thulium doped fiber amplifier for the first window from 790 nm to 850 nm with 690 nm/1400 nm dual pumping

Thulium doped fiber amplifier for the first window from 790 ...

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Optical Fiber Communication (OFC) Conference

作者： Y. Akasaka H. Inoue S.S.-H. Yam Y. Kubota Advanced Technology Laboratories Inc. Burlingame CA USA Institute of Industrial Science University of Tokyo Meguro Tokyo Japan Department of Electrical and Computer Engineering Queen's University Kingston ONT Canada Optical Device Development Central Glass Company Limited Tokyo Japan

We demonstrate an optical amplifier with 30 dB gain for the 850 nm window using specialized fiber and practical pumping wavelengths of 690 nm and 1400 nm. The experimental results were achieved after thorough calculat... 详细信息

ISBN: (纸本)1557527849

关键词： Doped fiber amplifiers Stimulated emission Optical pumping Glass Semiconductor optical amplifiers Optical fiber communication Absorption Laser excitation Optical fiber amplifiers Windows

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Hot electrons in resonant-phonon terahertz quantum cascade lasers

Hot electrons in resonant-phonon terahertz quantum cascade l...

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Conference on Lasers and Electro-Optics, CLEO 2005

作者： Vitiello, Miriam Serena Scamarcio, Gaetano Spagnolo, Vincenzo Williams, Benjamin S. Kumar, Sushil Hu, Qing Reno, John L. INFM Regional Laboratory LIT Dipartimento Interateneo di Fisica M.Merlin Università di Bari via Amendola 173 70126 Bari Italy INFM Regional Laboratory LIT Dipartimento Interateneo di Fisica M.Merlin Politecnico di Bari via Amendola 173 70126 Bari Italy Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States Sandia National Laboratories Department 1123 MS 0601 Albuquerque NM 87185-0601 United States

The electronic temperatures of individual subbands, the lattice temperature and the population inversion both below and above the laser threshold of THz quantum cascade lasers are extracted by the analysis of interba... 详细信息

ISBN: (纸本)1557527709

关键词： Hot electrons

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