Table of Content

26 June 2014, Volume 20 Issue 3

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Website Knowledge Acquisition and Its Application Based on Web Data Mining: A Case Study of dianping.com

YOU Jian-xin1,2, MENG Yin-wei1

2014, 20(3):  261-273.  doi:10.3969/j.issn.1007-2861.2014.02.016

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Knowledge acquisition becomes increasingly important in business management. With the rapid development of Internet and its applications, a huge mount of data is generated. Thus, enterprise managers need to acquire potential knowledge from the massive information source to support the business peration and management. According to an analysis of previous researches, a procedure of website knowledge acquisition is designed based on web data mining. A case study based on dianping.com is carried out. This research can help people understand the great influence of knowledge acquisition towards business operation and management and provide advices to enterprises in knowledge acquisition.

Application of Multivariate Normal Scan Statistic to Most Severe Cluster of Local Diseases

JIANG Wei1, SHEN Xiao-bei2, TSUNG Fugee3

2014, 20(3):  274-280.  doi:10.3969/j.issn.1007-2861.2014.02.012

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This paper focuses on the problem of detecting ageographical cluster with the most severe status in multiple groups of populations with the consideration of limited medical resources. In an early stage of a disease, an outbreak may only be present in some specific population group. Therefore, to efficiently detect the outbreak, specific groups need to be particularly monitored and evaluated. The objective of detection as the most severe cluster (MSC) is defined. Considering interaction among population groups, a multivariate normal scan statistic is proposed. The method is applied to an example of lung cancer in New York State to detect the MSC with a high mortality rate at the aggregate level.

Early Warning Error Analysis Based on ARTSOC and Application

WANG Jian1, CAO De-bi2, ISHII Takashi2

2014, 20(3):  281-288.  doi:10.3969/j.issn.1007-2861.2014.02.010

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Although Japan is good in earthquake early warning (EEW), the warning error still needs to be reduced. A method is proposed based on simulation results using the multi agent technology—artificial societies (ARTISOC). Under the given conditions, the error characteristics can be examined according to the possibility of different cases in the simulation. The method is tested with actual data from Japan. It can be used to improve the layout of the earthquake observation network.

Co-training Algorithm for Quality Analysis of Online Customer Reviews

JIN Jian1,2, JI Ping2,3

2014, 20(3):  289-295.  doi:10.3969/j.issn.1007-2861.2014.02.013

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Online customer reviews exist widely on e-commerce websites. Customer concerns and preferences about products are involved in these reviews. It is critical for business professionals to analyze online reviews efficiently and effectively in the fierce market competition. Typically, the quality analysis of online reviews is a good example. Accordingly, two aspects of features are identified from online reviews, and a Co-training algorithm is built to analyze quality of online reviews. Effectiveness of the algorithm and its advantages over a single classification/regression algorithm is confirmed by experiments.

Fuzzy Comprehensive Evaluation of Service Quality of Trade Area Based on SERVQUAL Model

CHEN Yi-zeng, YU Qi

2014, 20(3):  296-303.  doi:10.3969/j.issn.1007-2861.2014.02.011

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This paper obtains the most pressing customers’ requirements about the service quality of a trade area based on the SERVQUAL model and fuzzy analytic hierarchy process(FAHP). The service quality of a trade area is evaluated comprehensively to find problems in the service quality of the trade area. An evaluating model named fuzzy comprehensive evaluation of service quality(FCESQ) is established. The result shows that the bottleneck that affects the overall service quality of a trade area includes the quality of service staff, business integrity and treatment of customer complaints. The reasons of these problems are found and analyzed, and the measures to improve service quality of the trade area are proposed, thus improving the overall competitiveness of a trade area.

Audio Re-sampling Detection in Audio Forensics Based on Second-Order Derivative

HOU Li-min, WU Wei-qi, ZHANG Xin-peng

2014, 20(3):  304-312.  doi:10.3969/j.issn.1007-2861.2013.07.028

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Audio tampering is often accompanied with re-sampling especially in audio plicing, re-compression, time-scale and pitch-scale modification, quality faking and other perations. Therefore, re-sampling detection is an important means in audio forensics. his paper proposes a new method to detect audio re-sampling. It is theoretically shown hat, if an original audio signal is re-sampled, significant peaks can be found in second-order erivative of the spectrum, and the peak position is related to re-sampling factor. This ethod is applicable to common nonlinear interpolation. Detection performance influenced by audio duration or content or format is discussed. Finally, an automatic detection scheme is described, and experimental results show that the algorithm can be used to detect resampled audio effectively.

Adaptive Hybrid Rate Control Algorithm Based on HTTP Streaming

CHEN Li-wei, LI Guo-ping, TENG Guo-wei, ZHAO Hai-wu, WANG Guo-zhong

2014, 20(3):  313-320.  doi:10.3969/j.issn.1007-2861.2013.07.027

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Dynamic adaptive streaming over HTTP streaming has gradually been employed for video content delivery over internet. A novel adaptive rate control algorithm is proposed, in which video resource cache and network throughput are the main parameters for hybrid control. In the video resource cache control mechanisms, the method of balancing cache space is used to adjust consumed time of a single video segment pouring into the cache. This way, the total amount of video data can be maintained in a balanced range. In the network throughput control mechanism, under the current network conditions the media bitrates is switched up and detected using a conservative strategy, and the logistic equation determines bitrates reduction. Compared with single parameter, two parameters improve the accuracy, and optimal control performance can be achieved. The proposed algorithm has been verified on the MPEG-DASH standard reference platform.

Electronically Tunable Bandpass Filter Based on Dual-Mode Open-Loop Resonator

CHU Jun-jun, XIAO Zhong-yin, LI Hao, MA Quan-wen, XU Xiao-xue

2014, 20(3):  321-329.  doi:10.3969/j.issn.1007-2861.2013.07.017

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This paper proposes a novel varactor-tuned microstrip bandpass filter consisting of two dual-mode open-loop resonators. No coupling exists between the two operating modes, odd-mode and even-mode. Based on this feature, a simple DC bias circuit has been used to tune the resonator’s odd and even mode frequency respectively to realize tunable passband frequency. Analysis of the coupling matrix of the resonator model shows that a transmission zero is produced at the edge of the passband, which greatly improves frequency selectivity of the filter. This filter is tuned from 0.87 to 1.03 GHz (GSM 900)  with return loss of more than 20 dB and nearly constant frequency response. Performance of a fabricated filter shows good agreement with the simulation results.

Substrate Integrated Waveguide Dual-Band Filter with Multi-transmission Zeros

CHENG Xiao-qi, LI Guo-hui, JIAN Hao, PENG Tai-wei

2014, 20(3):  330-336.  doi:10.3969/j.issn.1007-2861.2013.07.024

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A novel dual-band filter based on the substrate integrated waveguide (SIW) is proposed. The filter is composed of two filters with different center frequencies and bandwidths. The two filters share the same input and output ports and use a rectangular substrate integrated waveguide cavity structure. Multi-transmission zeros have been obtained by electrical coupling between the source and the load, greatly improving the frequency-selective characteristics of the filter. A Ku-band substrate integrated waveguide dual-band filter is designed, with bandwidths of 220 and 120 MHz for the two pass-bands. A model with full-wave simulation is built with the Ansoft HFSS. Simulation results show that the filter has steep stopband attenuation and a compact structure.  easurement results agree well with the simulation.

Effect of Solid Wall Model on Simulation of Nanoparticle Adsorption in Dissipative Particle Dynamics

HUANG Ru-jia, HU Guo-hui, ZHOU Zhe-wei

2014, 20(3):  337-347.  doi:10.3969/j.issn.1007-2861.2013.07.039

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Dissipative particle dynamics (DPD) is a powerful tool in mesoscopic flow simulation. Commonly used model of face centered cubic (FCC) wall causes false density fluctuations near the wall. As critical regions of nanoparticle adsorption, this phenomenon cannot be ignored. This paper uses a random wall model in the simulation of nanoparticle adsorption, and compares it with the FCC wall model in the density distribution and nanoparticle adsorption simulation.

Steady-State Response of Weakly Forced Vibration for a Buckling Beam under Axial Press

WANG Hao1, ZHANG Yan-lei2, CHEN Li-qun1,3,4

2014, 20(3):  348-354.  doi:10.3969/j.issn.1007-2861.2013.07.025

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A nonlinear analysis of the response of a simply-supported viscoelastic buckled beam to a couple of constant axial force and harmonic excitation is resented. The disturbance equation of transverse vibration of the buckled beam is derived from the free governing equation via a coordinate transform. The Galerkin method is applied to truncate the systems to a multiple degrees-of-freedom of nonlinear vibration system. In the presence of internal resonances, a method of multiple scales is developed to obtain the steady-state relationship between the amplitudes in the first two resonant modes in weak forced, and reveal a unique saturation phenomenon in nonlinear system with quadratic items.

Effect on Electrochemical-Made Porous Silicon by FIB Etching

WANG Jing-jie1,2, XU Jia-qiang1, JIAO Ji-wei2

2014, 20(3):  355-361.  doi:10.3969/j.issn.1007-2861.2013.07.036

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A porous silicon (PSi) process for realizing controllable micro-to-nano scale features after focused ion beam (FIB) treatment is reported. An area, in which electrochemical etching is suppressed, therefore termed a shielding area, exists around the patterns treated by FIB. The area is formed due to a secondary knocked-on effect in the FIB process. The size of the shielding area is positively related to the energy used in FIB and resistivity of the silicon substrate. The shielding area on PSi has a width of 14 μm. The circular feature of PSi with a diameter as large as 10 μm is reported here for the first time. Inside the area no pores appear, while outside the shielding area remains.

Buckling Behavior of Carbon Nanotubes Filled Atoms

CHEN Hao1, SHI Dong-li1,2

2014, 20(3):  362-367.  doi:10.3969/j.issn.1007-2861.2013.07.014

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This paper presents the simulation of axial compression of single-walled carbon nanotubes (CNTs) filled with copper atoms. The effect of the filled atoms’ position on buckling behavior of perfect CNTs and defective CNTs is studied. It has been shown that the position of filled atoms has no effect on the buckling strain of perfect CNTs, but affects the buckling position. For CNTs with single atomic defect, the relative position of defect and filled atoms significantly affect the buckling behavior of CNTs.

Some Integral Inequalities Involving AH Convex Functions and Their Applications

HE Xiao-hong1, XU Qian2

2014, 20(3):  368-373.  doi:10.3969/j.issn.1007-2861.2013.07.051

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This paper establishes Hermite-Hadamard type inequalities involving AH convex functions using analytical methods. As applications of the integral inequalities to Gamma function, a Kershaw-type of Gamma function is proved, which strengthens some previous results.

Stability of Flooding Foam System

ZHU Yang-wen1,2, XIANG Ming-hui3, SONG Xin-wang2, LIANG Xin3

2014, 20(3):  374-380.  doi:10.3969/j.issn.1007-2861.2014.01.009

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This paper selects foam stabilizers based on the alpha-olefin sulfonate foaming system. Polyacrylamide and carboxymethyl cellulose (CMC) with average molecular weight (MW) of 3 million, 10 million, and 2 million to 14 million play the tackifying role. Octanol and dodecanol strengthen the liquid film. With the foam stabilizer added to the foaming system, the foaming properties are studied, including stability and oil-water interfacial tension. The results show that polyacrylamide reduces foaming capacity and stability of the foam system, and increases the oil-water interfacial tension. CMC enhances foam stability in appropriate concentrations. Alcohol seriously affects the foam system under the experimental conditions.

Distribution Characteristics of Pollutants for Paraffins and Non-hydrocarbons in Superficial Sediment at Longfeng Wetland

DAI Chun-lei, FENG Jin-lai, LI Jun-gang

2014, 20(3):  381-384.  doi:10.3969/j.issn.1007-2861.2013.07.037

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The Longfeng wetland is being contaminated to different extents. Many paraffins and non-hydrocarbons contaminants are enriched and aggraded due to low liquidity of wetland water. In addition, some organic pollutants are difficult to be degraded in the anaerobic environment. The rules of migration and transformation in Longfeng wetland environment are confirmed by determining the content and properties of paraffins and nonhydrocarbons pollutants. The presented study provides the precondition and a basis for effective control of Longfeng wetland contamination.

Bending of Split Circular Timber Beam Strengthened with Fiber Reinforced Polymer

OUYANG Yu, FAN Lei-qin

2014, 20(3):  385-396.  doi:10.3969/j.issn.1007-2861.2013.07.011

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The reinforcement effect of the fiber reinforced polymer (FRP) sheet bonding on the whole surface of a circular cross-section timber beam on the bending of timber beam with longitudinal through split is investigated. The governing equation for bending deformation of the circular timber beam with longitudinal split strengthened FRP sheet is established. The bending behavior of the FRP-strengthened circular timber beam under a concentrated load at its free end is studied. An analytical solution is obtained. Influences of the modulus and thickness of the FRP-sheet, slenderness ratio and split width of the timber beam, etc., on the bending behavior of the timber beam are analyzed. Numerical results show that the deflection of the FRP-strengthened circular timber beam at its free end is decreased with the increasing thickness, elastic and shear modulus of FRP sheet. When the modulus and thickness of the FRP sheet reach a certain values, the reinforcement effect is not obvious for continuing increase of the thickness and elastic modulus of the PRP sheet. Furthermore, the shear modulus of the FRP sheet has clear influence on the deflection of the short timber beam. The influence of beam’s split can be eliminated completely by the carbon FRP reinforcement when the shear modulus of the FRP sheet is large.