Tsinghua Science and Technology

Issue 1 • Feb. 2011

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Displaying Results 1 - 19 of 19
  • [Front cover]

    Publication Year: 2011, Page(s): c1
    IEEE is not the copyright holder of this material | PDF file iconPDF (1170 KB)
    Freely Available from IEEE
  • Contents

    Publication Year: 2011, Page(s): 1
    IEEE is not the copyright holder of this material | PDF file iconPDF (76 KB)
    Freely Available from IEEE
  • Multimodal integration processes in plan-based service robot control

    Publication Year: 2011, Page(s):1 - 6
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (7596 KB)

    Cross-modal integration processes are essential for service robots to reliably perceive relevant parts of the partially known unstructured environment. We demonstrate how multimodal integration on different abstraction levels leads to reasonable behavior that would be difficult to achieve with unimodal approaches. Sensing and acting modalities are composed to multimodal robot skills via a fuzzy mu... View full abstract»

    Open Access
  • Causal inference in graph-text constellations: Designing verbally annotated graphs

    Publication Year: 2011, Page(s):7 - 12
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (469 KB)

    Multimodal documents combining language and graphs are wide-spread in print media as well as in electronic media. One of the most important tasks to be solved in comprehending graph-text combinations is construction of causal chains among the meaning entities provided by modalities. In this study we focus on the role of annotation position and shape of graph lines in simple line graphs on causal a... View full abstract»

    Open Access
  • Robust hierarchical framework for image classification via sparse representation

    Publication Year: 2011, Page(s):13 - 21
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3428 KB)

    The sparse representation-based classification algorithm has been used for human face recognition. But an image database was restricted to human frontal faces with only slight illumination and expression changes. Cropping and normalization of the face needs to be done beforehand. This paper uses a sparse representation-based algorithm for generic image classification with some intra-class variatio... View full abstract»

    Open Access
  • Pulse coupled neural network edge-based algorithm for image text locating

    Publication Year: 2011, Page(s):22 - 30
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (44592 KB)

    This paper presents a method for locating text based on a simplified pulse coupled neural network (PCNN). The PCNN generates a firings map in a similar way to the human visual system with non-linear image processing. The PCNN is used to segment the original image into different planes and edges detected using both the PCNN firings map and a phase congruency detector. The different edges are integr... View full abstract»

    Open Access
  • One fire detection method using neural networks

    Publication Year: 2011, Page(s):31 - 35
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (399 KB)

    A neural network fire detection method was developed using detection information for temperature, smoke density, and CO concentration to determine the probability of three representative fire conditions. The method overcomes the shortcomings of domestic fire alarm systems using single sensor information. Test results show that the identification error rates for fires, smoldering fires, and no fire... View full abstract»

    Open Access
  • COMPUTER SCIENCE 
  • Reliability analysis of the cayley graphs of dihedral groups

    Publication Year: 2011, Page(s):36 - 40
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (422 KB)

    Cayley graphs have many good properties as models of communication networks. This study analyzes the reliability of the Cayley graph based on the dihedral graph. Graph theory and analyses show that almost all Cayley graphs of the dihedral graph D2n are optimal super-λ. The number Ni(G) of cutsets of size i, λ ⩽ i ⩽ λ' is given as $N... View full abstract»

    Open Access
  • Partition-based global placement considering wire-density uniformity for CMP variations

    Publication Year: 2011, Page(s):41 - 50
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (480 KB)

    This paper presents a multilevel hypergraph partitioning method that balances constraints on not only the cell area but also the wire weight with a partition-based global placement algorithm that maximizes the wire density uniformity to control chemical-mechanical polishing (CMP) variations. The multilevel partitioning alternately uses two FM variants in the refinement stage to give a more uniform... View full abstract»

    Open Access
  • Mutual information is copula entropy

    Publication Year: 2011, Page(s):51 - 54
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3910 KB)

    Mutual information (MI) is a basic concept in information theory. Therefore, estimates of the MI are fundamentally important in most information theory applications. This paper provides a new way of understanding and estimating the MI using the copula function. First, the entropy of the copula, named the copula entropy, is defined as a measure of the dependence uncertainty represented by the copul... View full abstract»

    Open Access
  • Traffic engineering for proactive failure recovery of IP networks

    Publication Year: 2011, Page(s):55 - 61
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (457 KB)

    As a promising approach to improve network reliability, proactive failure recovery (PFR) re-routes failure affected traffic to backup paths without waiting for the completion of IProuting convergence. However, the failure affected traffic may cause congestion if it is not carefully allocated over the backup paths according to their available capacity. A post failure traffic engineering (PostTE) sc... View full abstract»

    Open Access
  • Markov clustering-based placement algorithm for hierarchical FPGAs

    Publication Year: 2011, Page(s):62 - 68
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (859 KB)

    Divide-and-conquer methods for FPGA placement algorithms including partition-based and cluster-based algorithms have shown the importance of good quality-runtime trade-off. This paper describes a cluster-based FPGA placement algorithm targeted to a new commercial hierarchical FPGA device. The algorithm is based on a Markov clustering algorithm that defines a sequence of stochastic matrices operati... View full abstract»

    Open Access
  • Who wants to be informed — Less risk aversion or more risk aversion?

    Publication Year: 2011, Page(s):69 - 73
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (323 KB)

    Information is an important issue in financial markets since information advantage leads to increased profits. This paper investigates whether those with less risk aversion or more risk aversion would like to be informed when there is private information which can be acquired for a certain cost. The CARA utility function and normal return assumptions were used to get the closed form solution of th... View full abstract»

    Open Access
  • 24-bit low-power low-cost digital audio sigma-delta DAC

    Publication Year: 2011, Page(s):74 - 82
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (5111 KB)

    This paper describes a low-power low-cost 24-bit Σ-Δ digital-to-analog converter (DAC) for portable digital-audio applications. The interpolation filter uses a no-multiplier scheme to implement the arithmetic units and reading-writing common storage scheme for the delay-line to significantly reduce the die area. A 15-level quantizer, third-order, single-stageΣ-Δ modulat... View full abstract»

    Open Access
  • Guardband analysis for distributed OFDMA with user heterogeneity

    Publication Year: 2011, Page(s):83 - 89
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (572 KB)

    This paper presents an in-depth analysis of the interference strength and required guardband width between coexistent users for distributed orthogonal frequency division multiple access (OFDMA). In dynamic spectrum access networks, the cross-band interference between spectrally adjacent users is considered harmful with frequency guardbands inserted between spectrum blocks to eliminate the interfer... View full abstract»

    Open Access
  • Small-space microphone array fractional delay algorithm based on FIR filter for cochlear implant

    Publication Year: 2011, Page(s):90 - 94
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (655 KB)

    Directional speech enhancement of signals from microphone arrays is an effective way to improve speech recognition for cochlear implant users. The strict implant size limitation results in a short distance between microphones. The fractional delay problem due to the short distance between microphones is solved by a maximal flat (Maxflat) finite impulse response (FIR) filter, using the Maxflat erro... View full abstract»

    Open Access
  • English Speech Recognition System on Chip

    Publication Year: 2011, Page(s):95 - 99
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1276 KB)

    An English speech recognition system was implemented on a chip, called speech system-on-chip (SoC). The SoC included an application specific integrated circuit with a vector accelerator to improve performance. The sub-word model based on a continuous density hidden Markov model recognition algorithm ran on a very cheap speech chip. The algorithm was a two-stage fixed-width beam-search baseline sys... View full abstract»

    Open Access
  • Quantum switching based on the nearest neighbor hamiltonian

    Publication Year: 2011, Page(s):100 - 105
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (461 KB)

    This paper describes a quantum switching architecture for nearest neighbor coupling. An efficient quantum shear sorting (QSS) algorithm is used to reduce the number of time steps. For the QSS algorithm, the running complexity of the quantum switching architecture is polynomial in time with the nearest neighbor coupling and the implementation is less complex. The result shows that improved switchin... View full abstract»

    Open Access
  • Low-voltage transconductor with wide input range and large tuning capability

    Publication Year: 2011, Page(s):106 - 112
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (688 KB)

    A CMOS triode transconductor was developed with common mode feedback suitable for operating in low-voltage and low-power applications. The design is based on a body-driven input stage with feedback loops to extend both the signal input range and the tuning capability. The effective transconductance of the body-driven triode stage is increased using a partial positive feedback technique which also ... 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.

Full Aims & Scope

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