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Tsinghua Science and Technology

Issue 2 • Date April 2011

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Displaying Results 1 - 17 of 17
  • [Front cover]

    Publication Year: 2011, Page(s): c1
    IEEE is not the copyright holder of this material | PDF file iconPDF (1113 KB)
    Freely Available from IEEE
  • Contents

    Publication Year: 2011, Page(s): 1
    IEEE is not the copyright holder of this material | PDF file iconPDF (87 KB)
    Freely Available from IEEE
  • A computational model of concept generalization in cross-modal reference

    Publication Year: 2011, Page(s):113 - 120
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (479 KB)

    Cross-modal interactions between visual understanding and linguistic processing substantially contribute to the remarkable robustness of human language processing. We argue that the formation of cross-modal referential links is a prerequisite for the occurrence of cross-modal interactions between vision and language. In this paper we examine a computational model for a cross-modal reference format... View full abstract»

    Open Access
  • Suboptimal auditory dominance in audiovisual integration of temporalcues

    Publication Year: 2011, Page(s):121 - 132
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (782 KB)

    The present study examined whether audiovisual integration of temporal stimulus features in humans can be predicted by the maximum likelihood estimation (MLE) model which is based on the weighting of unisensory cues by their relative reliabilities. In an audiovisual temporal order judgment paradigm, the reliability of the auditory signal was manipulated by Gaussian volume envelopes, introducing va... View full abstract»

    Open Access
  • Multimodal brain-computer interfaces

    Publication Year: 2011, Page(s):133 - 139
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (10309 KB)

    A critical parameter of brain-computer interfaces (BCls) is the number of dimensions a user can control independently. One way to increment this number without increasing the mental effort required to operate the system is to stimulate several sensory modalities simultaneously, and to distinguish brain activity patterns when the user focuses attention to different elements of this multisensory inp... View full abstract»

    Open Access
  • Neural correlates of human associative learning

    Publication Year: 2011, Page(s):140 - 144
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (18001 KB)

    Lesion studies in animals have associated the amygdala mainly with aversive conditioning, both cued and contextual. However, neurophysiological studies indicate that the amygdala has a role in the processing of positive emotions in some kinds of stimulus-reward learning. The aim of the current study was to extend these findings to humans. Functional magnetic resonance imaging was applied to invest... View full abstract»

    Open Access
  • PMU guided structure data-layout optimization

    Publication Year: 2011, Page(s):145 - 150
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (931 KB)

    Existing methods of obtaining runtime feedback for structure data-layout optimization have several drawbacks, such as large overhead and difficulty composing training sets. As a result, structure data-layout optimization is not widely used. To overcome these drawbacks, a performance monitoring unit (PMU) sampling method was developed with much less overhead and better portability and usability. An... View full abstract»

    Open Access
  • Simulations of interaction among GMRs in a nano-sized biosensor array

    Publication Year: 2011, Page(s):151 - 156
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1369 KB)

    The interactions among nano-sized giant magnetoresistances (GMRs) which can affect the biosensor operation, were studied using micromagnetic simulations and micromagnetic analysis. The magnetic field energy, the magnetization distribution and the effective magnetic field were simulated for variable spacer distances, aspect ratios and external magnetic fields to study the interactions among the GMR... View full abstract»

    Open Access
  • Ultra-low power CMOS front-end readout ASIC for portable digital radiation detector

    Publication Year: 2011, Page(s):157 - 163
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1771 KB)

    An ultra-low power complementary metal-oxide-semiconductor (CMOS) front-end readout ASIC was developed for a portable digital radiation detector. The ASIC having a charge sensitive amplifier and a semi-Gaussian pulse-shaper was produced using the CSMC 0.5 urn DPDM process. The ENC noise of 363 e at 0 pF with a noise slope of 23 e/pF complies with the stringent low noise requirements. The peaking t... View full abstract»

    Open Access
  • EBA-LRU-SEQ data cache policy in dsp to optimize the power consumption

    Publication Year: 2011, Page(s):164 - 169
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (423 KB)

    The power consumption by the data cache is important in DSP designs. This study presents an enhanced branch access LRU-SEQ (EBA-LRU-SEQ) policy for data caches in DSP designs to reduce the power consumption. The design is based on the LRU policy with embedded prefetch table to provide branch access. Tests show that the EBA-LRU-SEQ policy reduces the data cache power consumption to 54% of a system ... View full abstract»

    Open Access
  • Estimates of EEPROM device lifetime

    Publication Year: 2011, Page(s):170 - 174
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (546 KB)

    A method was developed to estimate EEPROM device life based on the consistency for breakdown charge, QBD, for constant voltage time dependent dielectric breakdown (TDDB) and constant current TDDB stress tests. Although an EEPROM works with a constant voltage, QBD for the tunnel oxide can be extracted using a constant current TDDB. Once the charge through the tunnel oxide, ΔQ... View full abstract»

    Open Access
  • Modeling of a Schottky diode in CMOS process with a flexible “open-through” On-Chip De-embedding Method

    Publication Year: 2011, Page(s):175 - 180
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (6026 KB)

    Modeling of Schottky diodes in the CMOS process is a key step in ultra-high frequency (UHF) radio frequency identification (RFID) transponder designs. Accurate Schottky diode models need both DC and RF models. Conventional DC models of the Schottky diode fail to predict the forward leakage current, which is crucial for precise simulation results. This paper presents a Schottky diode model with an ... View full abstract»

    Open Access
  • Analytical solution to the density-gradient equation for MOS quantum tunneling

    Publication Year: 2011, Page(s):181 - 188
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (15089 KB)

    Engineering-oriented simulations of quantum mechanical tunneling are often based on density-gradient (OG) theory. This paper presents an analytical solution to the OG equation for quantum tunneling through an ultra-thin oxide in a MOS capacitor with an n+ poly-silicon gate obtained using the method of matched asymptotic expansions. Tunneling boundary conditions extend the approximation into... View full abstract»

    Open Access
  • Experimental study of discriminative adaptive training and MLLR for automatic pronunciation evaluation

    Publication Year: 2011, Page(s):189 - 193
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (377 KB)

    A stronger canonical model was developed to improve the performance of automatic pronunciation evaluations. Three different strategies were investigated with speaker adaptive training to normalize variations among speakers, minimum phone error training to identify easily confused phones and maximum likelihood linear regression (MLLR) adaptation to compensate for accent variations between native an... View full abstract»

    Open Access
  • Block cipher design: Generalized single-use-algorithm based on chaos

    Publication Year: 2011, Page(s):194 - 206
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1167 KB)

    The idea of using a one-time-one-key design has been widely applied in conventional cryptography. With the security theory of conventional cryptology, encryption algorithms are made public while all the secrets are encoded only in the keys. This paper applies chaos theory to conventional cryptography to develop a one-time-one-algorithm design. A general theory is given to generate the clock key, s... View full abstract»

    Open Access
  • Influence of node dynamics on cluster global time continuity

    Publication Year: 2011, Page(s):207 - 215
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (662 KB)

    The cluster global time can change in wireless sensor networks due to leader re-elections and node disabilities between two successive synchronizations, which will affect temporal relationships. This paper analyzes cluster global time continuity, using global time change models for the node dynamics. The results prove that defining the global time using the cluster average time (AGT) is more stabl... View full abstract»

    Open Access
  • Histogram of the oriented gradient for face recognition

    Publication Year: 2011, Page(s):216 - 224
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3366 KB)

    The histogram of oriented gradient has been successfully applied in many research fields with excellent performance especially in pedestrian detection. However, the method has rarely been applied to face recognition. Aimed to develop a fast and efficient new feature for face recognition, the original HOG and its variations were applied to evaluate the effects of different factors. An information t... View full abstract»

    Open Access

Aims & Scope

Tsinghua Science and Technology (Tsinghua Sci Technol) aims to highlight scientific achievements in computer science, electronic engineering, and other IT fields. Contributions all over the world are welcome.

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Meet Our Editors

Editor-in-Chief
Professor Jiaguang Sun
School of Software
Tsinghua University
Beijing  100084 China
journal@tsinghua.edu.cn
Phone:86-10-62771385