Table of Content

28 August 2006, Volume 12 Issue 4

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Articles

Steganography Using DualModulo Arithmetic without Introducing Histogram Abnormality

WANG Wei-na;ZHOU Zhen-yu;WANG Shuo-zhong

2006, 12(4):  331-337 . 

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A new steganographic embedding technique based on pixel pairs is described. The proposed method involves two modulo operations on the difference between pixels in each pixel pair and the gray-value of a pixel, respectively, hence the name modulo gray-value modulo difference(MGMD). The number of bits to be embedded into each pair is determined by the pixel difference. The secret data and the results of two modulo operations are combined and used to modify the host pixel pair such that the gray level difference is kept unchanged. MGMD embedding causes no histogram abnormality as often encountered in other pixel pairbased techniques such as PVD and SM. It can also resist the popular RS and χ² analyses. Security of the method is confirmed in experiments on a large number of images.

Biorthogonal Multiwavelet Packet Theory

CHEN Jun-li;LU En-bo;CAO Wen-jia

2006, 12(4):  338-341 . 

Asbtract ( 1969 )  

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Multiwavelet can simultaneously posses many desired properties such as short support, orthogonality, symmetry and high vanishing moments, which a single wavelet cannot posses. Multiwavelet has increasingly attracted attention in the research community. The goal of this paper is to generalize the notions and properties of wavelet packet to produce biorthogonal multiwavelet packet, and to develop the theoretical framework of biorthogonal multiwavelet packet, which makes more kinds of signals for analysis with multiwavelet. A proof is given.

Comprehensive Improvement of MLFMA

CHEN Xiao-xin;ZHANG Hong-xia;NI Wei-li

2006, 12(4):  342-346 . 

Asbtract ( 1977 )  

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This paper proposes three methods for improvement of MLFMA including fixed side-length subdivision, assignment of weight of translation factor, and optimization for storing kernel arrays. Using these methods, one can reduce memory requirements and accelerate matrixvector multiplication. Numerical results show the validity of the optimizing methods.

Face Recognition Based on Computation of Variance Similarity

HUANG Cui-rong;YAN Pei-min;SHI Lu-ming

2006, 12(4):  347-350 . 

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This paper deals with image match for face recognition. Variances of feature vectors are computed, giving the weights of similarity after certain translation to the variations. This method is beneficial in increasing the face recognition rate due to its stability and accuracy. Experiments are carried out using the face database developed in the authors' laboratory. The recognition results are satisfactory, indicating validity of the proposed method.

Design of Precision GPS Compass

SHI Hai;CUI Wen-nan

2006, 12(4):  351-353 . 

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GPS compass is a new kind of navigation equipment, which overcomes the shortcomings of traditional compasses and provides accurate navigation data anywhere, anytime. Software and hardware are designed, with error of single spot location less than 10 mm, and that of course attitude angle less than 1.0°. Experiments show that this low priced GPS compass has high precision and reliability.

Classification of Breast Cancer Genes with a Simplified Fuzzy ARTMAP Approach

CHEN Zhi-hong;YAN Zhuang-zhi;LIU Shu-peng

2006, 12(4):  354-358 . 

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This paper presents a gene expression-based classification method for hereditary breast cancer, using a simplified fuzzy ART map. The method was tested on gene expression profiles with BRCA1 and BRCA2, respectively, from Hedenfalk's experiment. The results show that the method has a hit rate of 78% estimated by leave one out method.

A Triple-Band Slot-Loaded Patch Antenna

GUAN Zhong-wei;WU Di

2006, 12(4):  359-361 . 

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This paper presents a new method for designing a triple-band microstrip patch antenna. By etching two asymmetrical narrow slots close to the radiating edges of a rectangular patch, the antenna shows similar radiation properties at three resonant frequencies and achieves tri-band operation. Results of experiments on a designed antenna show validity of the method.
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A Valve Shuttered Electronic Expansion Valve

TAO Ji-ming;HE Kui;LI Yang

2006, 12(4):  362-365 . 

Asbtract ( 1915 )  

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Discharge characteristic of the cone valve structure is studied. Based on this, a new structure of electronic expansion valve (EEV) is proposed. The new structure can improve discharge characteristics. It also has some additional merits including low leakage and good linearity. All these provide a platform to control flux accurately. It is useful in improving performance of air conditioning systems.

Improvement of AR Registration Accuracy with a Non-linear Camera Model

DING Wei-qi;WU Jia-qi;YUAN Zheng-peng;CHEN Jin-bo

2006, 12(4):  366-370 . 

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Registration is a key technique in an augmented reality (AR) system. A recent registration method based on fundamental matrix does not need auxiliary instruments and manmade markers, therefore is easily implemented and widely adaptable. However its registration accuracy needs improvement. In this paper the Tsai algorithm is used to introduce a non-linear camera model and correct distortion in the image feature points. The corrected feature points are then applied to the registration method based on a fundamental matrix. Experimental results show that the new registration technique provides better accuracy than the original method.

An Improved Two-Dimensional Optimal Information Diffusion Method

ZHANG Jing-jing;HE You-hua;WANG Qiao-lan;XIN Li-li

2006, 12(4):  371-375 . 

Asbtract ( 1898 )  

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By improving the method for two-dimensional information diffusion that is governed by a single parameter, a new type of diffusion function is obtained. Based on the new diffusion function, an optimized parametric model is proposed for information diffusion under some criteria based on real situations. An example using the proposed method is given, which results in better results with a small sample.

MiRdetector: A Computational Tool to Predict and Detect miRNA Genes

ZHANG Dong-ning;LIU Yang;WANG Yi-fei

2006, 12(4):  376-382 . 

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MicroRNA (miRNA) are a class of endogenous 21～24 nucleotide non-coding small RNAs. They may participate in a wide range of genetic regulatory pathways and play an important role in the development of both animals and plants. The number of miRNA genes in every species is still unknown. Bioinformatics analytic method has been used to find novel miRNA genes. In this study, a computational system called MiRdetector is developed, which is used to predict and identify miRNA genes. The computational system is based on homology search and prediction of stem-loop structure. Oryza sativa miRNA genes were used to examine the prediction quality. In total, 140 in 155 samples were correctly identified. The prediction accuracy reaches 90.32%. Moreover, detected 95 potential miRNA genes were detected. The false positive rate was low, so the data set of candidate miRNA genes can well be used for further verification in experiments.

Double Wronskian Solution to the Modified Korteweg-de Vries Equation

LU Lili;HAO Honghai;BI Jinbo;CHEN Dengyuan

2006, 12(4):  383-388 . 

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The mKdV equation is solved using the Hirotas's direct method and the Wronskian technique.The generalized double Wronskian solution is derived through generalized conditions satisfied by Wronskian entries.

A Rigorous Method for Solving 0-1 Polynomial Knapsack Problem

SHENG Hong-bo;SUN Juan;SUN Xiao-ling

2006, 12(4):  389-393 . 

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This paper proposes a rigorous algorithm for solving the 0-1 polynomial knapsack problem. The algorithm uses a branch-and-bound method based on Lagrangian relaxation and dual search. The upper bounds are computed with the outer approximation method where Lagrangian relaxations are solved with the maximumflow algorithm. Heuristic procedures are derived to search for feasible solutions, and some variables in the optimal solution are determined before the branch-and-bound process, thus improving performance of the algorithm. Promising computational results are reported for test problems.

Chord-Integrals of Star Bodies

LI Yu-hong;\UAN Jun;LENG Gang-song

2006, 12(4):  394-398 . 

Asbtract ( 1936 )  

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The i th chord-integrals of star bodies are introduced, and some inequalities and propositions for the chord-integrals of star bodies established. Asan application, the Brunn-Minkowski inequality for star duality of intersection bodies is obtained.

Rebalance Timing of Index Tracking

LIU Shaolin;QIN Chenglin

2006, 12(4):  399-402 . 

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The rebalance timing of index tracking with proportional transaction c

osts is studied. We make use of linear tracking error (MAD) first introduced by

Markus Rudolf. There are two cases in the rebalancing: periodical adjustment and

aperiodical adjustment. The latter case is studied. Results of numerical experi

ments on these two adjustment methods for the 30 indices of Dow Jones Industrial

Average in two months are given.
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Identification of Modal Parameters of Multiple DegreeofFreedom 
System Based on HilbertHuang Transform

DUAN Xibo;ZHANG Jiguang;;YAN Yong

2006, 12(4):  403-407 . 

Asbtract ( 1988 )  

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For adaptively analyzing nonstationary and nonlinear signals, Hilber

t

Huang transform (HHT) has been developed recently. An HHT based method is prop

o

sed to identify modal frequency and damping ratio, in which the measured respons

e data polluted by noise are first decomposed into modal responses using empiric

al mode decomposition (EMD). HHT is then applied to each modal response to obtai

n the instantaneous amplitude and phase angle time histories. Linear leastsqua

r

e fitting is carried out to identify the natural frequency and damping ratio fro

m the instantaneous amplitude and phase angle for each modal response. Experimen

tal results show the validity of the algorithm. 

ualitative and Quantitative Analysis of Hydrogen and Carbon
Monoxide Produced from Radiolysis of Acetohydroxamic Acid
in Aqueous Solution

ZHANG Bing;WANG Jinhua;BAO Borong;WU Minghong;WU Junping;ZHENG Weifang

2006, 12(4):  408-411 . 

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Qualitative and quantitative analyses of hydrogen and carbon monoxide produced f

rom the radiolysis of AHA in aqueous solution are reported. Studies were perform

ed using chromatography. A 2 m column packed with 0.5 nm molecular sieve and

a thermal conductivity detector were used. The results show that volume fracti

on of hydrogen is very high when concentration of AHA is in the range of
0.1～0.5 mol/L and the dose is 10～1 000 kGy. Volume fraction of hydrogen is

not
closely related with AHA concentration. Volume fraction of hydrogen increases
with the increase of dose when the dose is below 500 kGy, but is less dependent

on the dose when the dose is higher than 500 kGy. Carbon monoxide is produced on

ly when the dose is relatively high, and its volume fraction is very low.

Synthesis of 2,6dimethyl3,5pyridinediaryhydrazones in Water

CUI Liying;ZHANG Min;XU Zhen;HUANG Peigang;LI Zhifen

2006, 12(4):  412-414 . 

Asbtract ( 1959 )  

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2,6dimethyl1,4dihydro3,5pyridinedicarboxybic diesters was oxidized, hy

drazinnolized and then condensed with aroylaldehydes in aqueous suspension to sy

nthesize six acylhydrazones 4a～4f.Their structures were confirmed by MS, IR

and 1HNMR spectra.