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Date 5-8 Oct. 2003

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Displaying Results 1 - 25 of 3650513
  • Knowledge Web: a public domain expert system delivery environment

    Publication Year: 2003 , Page(s): 2162 - 2168 vol.3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (569 KB) |  | HTML iconHTML  

    Knowledge Web is a public domain expert system delivery environment aimed at enabling a wide range of high-quality expert systems to be created and made available free of charge to users via the world wide web. Applications have a uniform 'look and feel', do not require any special software to use apart from a standard web browser and are fully integrated with other sources of information on the web. Knowledge Providers make use of a rapid application development facility which automatically converts expert system modules written in a simple scripting language into rules and questions for a production rule interpreter running on the Knowledge Web server. View full abstract»

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  • Estimation of harmonic signal phases with a priori indefinite parameters

    Publication Year: 2004 , Page(s): 128 - 129
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (241 KB)  

    In this paper obtained the estimations of amplitude and harmonic signal phases of Gaussian noise of unknown power and linear-varying background with a priori indefinite parameters. Dispersion of amplitude and harmonic signal phases estimations have been obtained. View full abstract»

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  • Rapid development of large knowledge bases

    Publication Year: 2003 , Page(s): 2169 - 2174 vol.3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB) |  | HTML iconHTML  

    This paper presents the Disciple-RKF methodology for rapid development of large knowledge bases which relies on importing ontological knowledge from existing knowledge repositories, on parallel development of separate knowledge bases by subject matter experts, and on the merging of these knowledge bases into a high performance integrated knowledge base. The paper discusses several issues related to ontology import and merging, and presents the results of a successful knowledge base development and integration experiment performed at the US Army War College. View full abstract»

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  • Transitionally adopting new technologies in foreign language teaching

    Publication Year: 2004
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (164 KB)  

    Summary form only given. As the age of education is being affected by the emergence of IT, we'll be encountering many role transitions from teacher and student through course material to methods of teaching and evaluation. Among the different elements affecting English language classes, This work takes a close look at the realities and misconceptions of teachers' adapting to educational technology and electronic ways of learning English, in particular, which may seem a threat for them at first glance but a powerful instrument if properly conceived. View full abstract»

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  • Low temperature process flow optimisation for 65nm CMOS mixed-signal applications

    Publication Year: 2004 , Page(s): 197 - 200
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (335 KB) |  | HTML iconHTML  

    In this work, a complete low temperature 65 nm process flow using a low-cost, conventional CMOS approach has been investigated. A significant global thermal budget reduction has been achieved (below 500°C), especially for the spacer, silicide-protection and salicide modules. The introduction of new materials induced a great transistor performance enhancement in both the digital and analog/mixed-signal domains. The Ioff-Ion figure of merit has been improved by 20%, whereas the matching factors were reduced for both NMOS and PMOS transistors. This new optimized process flow satisfies the strict criteria of transistor reliability. View full abstract»

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  • Reed-Muller universal logic module networks

    Publication Year: 1993 , Page(s): 105 - 108
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (220 KB)  

    Describes Reed-Muller universal logic modules (RM-ULMs) and their use for the implementation of logic functions given in Reed-Muller (RM) form. A programmed algorithm is presented for the synthesis and optimisation of RM-ULM networks. The level-by-level minimisation procedure is based on the selection of control variables at different levels with the aim of maximising the number of discontinued branches and hence minimising the number of modules required to implement a given function. The algorithm is programmed in Fortran and can be used to realise fixed-polarity generalised Reed-Muller (GRM) expansions of any polarity and any number of variables. View full abstract»

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  • 3D realistic talking face co-driven by text and speech

    Publication Year: 2003 , Page(s): 2175 - 2186 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (420 KB) |  | HTML iconHTML  

    To create 3D realistic talking face has been a challenge for a long time. Previous works emphasize text or speech driven talking face respectively while the animation result is not very realistic or natural-looking. In the proposed approach, text and speech are considered to drive the 3D talkingface coordinately. The text is translated into a sequence of visemes' transcription. And time vector of the sequence is extracted from the speech corresponding to the text after it is segmented into phonetic sequence. A muscle based viseme vector is defined for static viseme. And then, with the time vector and the static visemes's sequence, dynamic visemes are generated through time-related dominance function. Finally, according to the frame rate to be rendered, intermediate frames are interpolated between key frames to make the animation result looks more natural and realistic than those obtained based on the text or speech-driven only. View full abstract»

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  • Ultra-precision stage control based on friction model of non-resonant ultrasonic motor

    Publication Year: 2004 , Page(s): 559 - 564
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1585 KB) |  | HTML iconHTML  

    This paper presents a friction model-based ultra-precision stage control that introduces the non-resonant ultrasonic motor (NRUSM). At first, the friction characteristic is experimentally evaluated as a function of the stage position. Next, the friction model is adopted for the proposed continuous-pass tracking control design, and then the efficiency of the model-based control is verified by positioning experiments. Finally, measuring the time variation of the static friction characteristics, the on-line identification method for the control system is proposed. View full abstract»

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  • Experimental research on counter-balanced dither mechanism for Ring Laser Gyroscope

    Publication Year: 2004 , Page(s): 91 - 95
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (331 KB) |  | HTML iconHTML  

    A set of counter-balanced dither mechanism for Ring Laser Gyroscope (RLG) has been designed to reduce the influence of lock-in of RLG. Designed dither frequency is 344.16Hz. By Finite Element Methodology (FEM) calculation, it is proved that the mechanism mode is reasonable and the strength requirements of the mechanism's material are satisfied. The error between the actual dither frequency, 316Hz, and the designed is less than 8.2%. In 30 minutes, the stability of dither frequency and amplitude (RMS value) are less than 0.05% and 5% respectively. The horizontal direction of the mechanism is much easier to be influenced by base vibration than the vertical one, but the readout signal is still good for application. View full abstract»

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  • Growth and characterization of 2" and 4" low EPD InP substrate crystals by the vertical gradient freeze (VGF)-method

    Publication Year: 2005 , Page(s): 392 - 397
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (390 KB) |  | HTML iconHTML  

    The growth of twin-free 4" semi-insulating InP crystals is reported. The influence of the EPD of the seed crystal and the cone angle of the crucible on dislocation and twin formation were studied. View full abstract»

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  • Analysis of voltage disturbances caused by simultaneous amplitude and phase modulation in electric power network

    Publication Year: 2004 , Page(s): 199 - 204
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (665 KB) |  | HTML iconHTML  

    Voltage distortions and disturbances in power network are an important power quality factor. Usually in literature phase disturbances are neglected and only amplitude distortions are discussed. Amplitude disturbances are interpreted as amplitude modulation (AM) of main 50 Hz frequency and considered to be the only reason of light flicker. Standard flicker measurement method is based under two not fulfilled assumptions: 1) AM with modulating frequency lower then 50 Hz carrier frequency and 2) constant carrier frequency. In the article detailed analysis of possible disturbances and it sources is presented. It is shown that AM and narrow band PM (phase modulation) take place in power network simultaneously and those two modulations interact with each other. Theoretical results are verified by field experiment. View full abstract»

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  • Sequential synthesizable embedded programmable logic cores for system-on-chip

    Publication Year: 2004 , Page(s): 435 - 438
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (594 KB) |  | HTML iconHTML  

    Previous work has suggested that "soft" synthesizable programmable logic cores can efficiently provide small amounts of post-fabrication flexibility to integrated circuits. Previous architectures restrict the circuitry assigned to the core to be combinational. We present two methods to enhance these architectures to support sequential logic. We apply these methods to a previously developed fabric, and optimize and compare them. We also describe a proof-of-concept chip employing one of our techniques. View full abstract»

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  • LC-oscillators above 100 GHz in silicon-based technology

    Publication Year: 2004 , Page(s): 131 - 134
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (299 KB) |  | HTML iconHTML  

    In this paper, voltage-controlled LC-oscillators (VCO) are presented, reaching oscillation frequencies well above 100 GHz. The oscillators were fabricated in a 200 GHz SiGe:C BiCMOS technology with 0.25 μm minimum feature size. In the design of the VCOs, two approaches for the frequency tuning of the oscillators were investigated. In the first design, the current flowing through the oscillator core was varied to get control of the output frequency. In the second design, a MOS-type varicap was used to tune the frequency of the LC-oscillator. The fabricated oscillators have a tuning range from 105.8 GHz to 114.5 GHz and from 113.2 GHz to 117.2 GHz, respectively. View full abstract»

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  • Macroscopic currents based Markovian model for sodium channels in cerebellar Purkinje neurons

    Publication Year: 2004 , Page(s): 164 - 167
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (349 KB)  

    In this study, a Markovian model for gating kinetics of sodium channel in dissociated cerebellar Purkinje neurons is developed. This model is developed based on voltage-clamped, resurgent and action potential evoked currents, known as macroscopic currents. The model is similar to the sodium model developed by Bean and Raman with some modifications made in the number of states and channel rate constants. Model parameters are determined by minimizing the error between model responses and three experimental data sets. The model reproduces quantitatively all features of the experimental data sets, with minor discrepancies. View full abstract»

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  • Automatic formatting of music sheets

    Publication Year: 2001 , Page(s): 170 - 177
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (378 KB) |  | HTML iconHTML  

    Music formatting is one of the most relevant problems of music notation editing programs. Several written and non-written rules are typically applied by music engravers and composers. An innovative approach for formalizing formatting rules is presented. The approach is based on insertion, position and priority rules and associated conditions for their activation. Conditions and rules formalized in the proposed approach are automatically executed by a formatting engine called MILLA (Music Intelligence Formatting Language). The approach is proposed by using several examples. View full abstract»

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  • Influence of RF signal power on tunable MEMS passive components

    Publication Year: 2003 , Page(s): 533 - 536 vol.1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (442 KB) |  | HTML iconHTML  

    MEMS structures are usually sensitive to the electrostatic or magnetic forces, but the influence of the force created by the RF signal going through them is rarely considered. In the case of MEMS tunable components, like microcapacitors or microinductors, the consequences of high RF power levels on performances are to be quantified. Two microcapacitors systems are studied: one-gap with RF signal and actuation voltage on same electrodes, and two-gaps with RF signal separated from actuation. Computational results show great influence of power on pull-in, even for quite low power levels, for both MEMS capacitor structures. Then, a similar approach is proposed for tunable microinductors, considering the influence of RF power on the Laplace force: a simple geometry with two coupled loops is studied, and the influence of power appears again very important. View full abstract»

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  • Field measurements inside a reverberation chamber

    Publication Year: 2004 , Page(s): 723 - 726 Vol.1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (330 KB) |  | HTML iconHTML  

    One of the basic problems using reverberation chambers for EMC and antenna measurements is how to conduct accurate field measurements inside the chamber. Two probes, a conventional dipole antenna and an unconventional field probe (an electro-optical (EO) probe), are employed to investigate this problem. Very different measurement results are obtained. It is shown that the presence of the field measuring system affects not only the field around the probe, but also the field distribution inside the chamber. This is also dependent on the chamber size, operational frequency, and transmitting antenna. The dipole measurement results are not as accurate as that obtained using the EO probe within a medium/small sized chamber. The measurements using both probes outside of the chamber have also been undertaken as part of the investigation; very similar results are obtained using both probes. In addition, this study also reveals that the statistical features of the field inside the chamber obtained by both probes are comparable. View full abstract»

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  • Non-linear transient simulation of microwave circuits and systems

    Publication Year: 2005 , Page(s): 166 - 169
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (160 KB) |  | HTML iconHTML  

    First Page of the Article
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  • Consistency maintenance in real-time collaborative image editing systems

    Publication Year: 2003 , Page(s): 2181 - 2186
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (438 KB) |  | HTML iconHTML  

    First Page of the Article
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  • A low-complexity contextual Hebbian detector for blind multiuser detection

    Publication Year: 2002 , Page(s): 2185 - 2189 vol.5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (616 KB) |  | HTML iconHTML  

    This paper proposes a blind multiuser detector for CDMA systems based on a contextual Hebbian paradigm. Conventional blind detectors employ second-order statistics in their formulation, leading to first-order filter update procedure. These approaches restrict the convergence rate and tracking capability of the detectors. Hebbian learning has shown potential in handling blind source separation problems. Nevertheless, it experiences order ambiguity of the extracted sources. This often leads to undesirable local convergence and consequently erroneous symbol demodulation. This paper presents a new contextual Hebbian paradigm that encapsulates domain information of the multiple-access interference to achieve blind detection. An adaptive detector is developed to address the issues of source indeterminacy and slow convergence. Experimental results show that the detector provides good performance in terms of fast convergence rate, optimal steady-state SINR profile, and low BER when compared with other detectors. View full abstract»

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  • Initial calibration of an inertial measurement unit using an optical position tracking system

    Publication Year: 2004 , Page(s): 96 - 101
    Cited by:  Papers (17)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (409 KB) |  | HTML iconHTML  

    A reliable calibration procedure of a standard six degree-of-freedom inertial measurement unit (IMU) is presented. Mathematical models are derived for the three accelerometers and three rate gyros, taking into account the sensor axis misalignments, accelerometer offsets, electrical gains, and biases inherent in the manufacture of an IMU. The inertial sensors are calibrated using data from a 3D optical tracking system that measures the position coordinates of markers attached to the IMU. Inertial sensor signals and optical tracking data are obtained by manually moving the IMU. Using vector methods, the quaternion corresponding to the IMU platform orientation is obtained, along with its acceleration, velocity, and position. Given this kinematics information, the sensor models are used in a nonlinear least squares algorithm to solve for the unknown calibration parameters. The calibration procedure is verified through extensive experimentation. View full abstract»

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  • Energy-aware supply and body biasing voltage scheduling algorithm

    Publication Year: 2004 , Page(s): 1956 - 1959 vol.3
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (212 KB) |  | HTML iconHTML  

    A technique of energy minimization by combining dynamic voltage scheduling (DVS) and adaptive body biasing voltage (ABB) method for distributed real-time system at system design level is proposed. Based on a simplified energy optimizing model, the proposed approach named LEVVS (low energy supply voltage and body biasing voltage scheduling algorithm) explores the minimizing of energy consumption by finding optimal trade-off between dynamic and static energy. Experiments show that, using the LEVVS approach, more than 53% average energy reduction can be obtained than by employing the DVS method alone. Furthermore the effects of switch capacitance and global slack on the energy saving efficiency of LEVVS are investigated. View full abstract»

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  • Exploring the energy-latency tradeoff of geographic random forwarding for ad hoc and sensor networks

    Publication Year: 2003 , Page(s): 2770 - 2774 vol.4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (395 KB) |  | HTML iconHTML  

    In this paper, we consider a novel forwarding technique based on collision avoidance and on knowledge of the geographical location of the nodes involved. Selection of the relaying nodes is made randomly via contention among receivers. We consider a simplified performance analysis and provide analytical parameter optimization. Comparisons giving evidence of the accuracy of our approximate approach are also provided. The scheme is compared with STEM, and is shown to perform significantly better for sufficient node density. View full abstract»

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  • Optical add/drop multiplexers and optical cross-connects for wavelength routed networks

    Publication Year: 2003 , Page(s): 41 - 46 vol.1
    Cited by:  Papers (16)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (461 KB) |  | HTML iconHTML  

    WDM optical communication systems are evolving from simple point-to-point links to complex network architectures. In wavelength routed networks switching is performed through optical add/drop multiplexer (OADM) and optical cross-connect (OXC) nodes. These nodes provide provisioning capabilities as well as protection and restoration at the optical layer. Routing and management of the traffic demands are applied through the generalised multiprotocol label switching (GMPLS) a control plane offering intelligence at the optical layer. A central subject of debate has been the comparison of optical and electrical switching technologies, however transparent solutions offer attractive features associated with reduced unnecessary optoelectronic conversions supporting transparent networks with reduced capital and operational cost. A number of different OADM and OXC architectures based on various technologies have been proposed to date. A detailed discussion on the different architecture and technology choices supporting a variety of features are given and specific design and implementation examples are analysed. The impact of impairments introduced by transparent elements present in the network, such as OADM and/or optical switches, is discussed and optimised solutions introducing low penalties proposed. In addition, the use of novel modulation formats improving the concatenation performance of such elements is covered. View full abstract»

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  • A new routing design methodology for multi-chip IC packages

    Publication Year: 2004 , Page(s): I - 473-6 vol.1
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (617 KB) |  | HTML iconHTML  

    This paper presents a new methodology for routing design in multi-chip IC packages for reducing design time while attaining a layer efficiency comparable to hand crafted design. In the proposed methodology, a designer interactively develops a routable sketch of the design by means of "bendable-rats", using a tailored tool. Then the resultant routable sketch is converted to a curvilinear physical routing using a rubber-band algorithm. A design trial shows a 4.2 times design time reduction for an industrial design example. View full abstract»

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