Volume 40,Issue 5,2017 Table of Contents

1 Cloud manufacturing resources semantic description and service matching strategy

WANG Weixing

2017, 40(5):1-6. DOI: 10.11835/j.issn.1000-582X.2017.05.001

[Abstract](962) [HTML](358) [PDF 1.53 M](1414)

Abstract:
To solve the manufacturing resource description problem and the service matching problem in cloud manufacturing, a general semantic description framework for manufacturing resources which considers the user's personalized needs and the heterogeneity of manufacturing resources was proposed. The difficulties of the cloud manufacturing resource description and the service matching were analyzed. By using the features of standardized description, the manufacturing resource description problems were transformed into Web semantic description problems. Combined with four similarity algorithms and the design of threshold and weight, a service matching strategy with filter was proposed. The experimental results verified the feasibility and effectiveness of the proposed strategy and algorithm. The application of the four similarity matching algorithms can effectively reduce the matching scale and improve the service search efficiency and accuracy.

2 A dynamic ice melting decision method for transmission lines considering outage risk of power grid

YI Yongliang , XU Wangsheng , HU Jiang , MENG Xianglong , XIONG Xiaofu , SHEN Zhijian

2017, 40(5):7-18. DOI: 10.11835/j.issn.1000-582X.2017.05.002

[Abstract](1097) [HTML](663) [PDF 2.18 M](1385)

Abstract:
Multiple transmission lines have the icing hidden fault when a large area of ice disaster happens to power grid, and the stable operation of power system will be seriously threatened. Therefore, the ice-melting scheme should be developed in advance to arrange the order of ice-melting reasonably. In order to analyze the outage risk of power grid caused by the continuous operation of icing-hidden transmission lines, it's needed to expand the substation main electrical wiring, which is associated with the transmission line needing to melt ice. An improved cutting load model is proposed to assess power grid outage risk of the combination network of transmission grid and substation. And a breaker reliability model is set up to access the outage risk caused by the continuous operation of transmission lines which queue at the rear of ice-melting queue. Icing rate is calculated based on line icing growth model considering wind speed and rainfall, and the ice melting lines set is determined by the icing rate threshold. Power system global icing index is proposed based on icing severity model. Considering the outage risk of power system and global icing index, the ice melting urgent degree index is proposed to dynamically update the ice melting lines set, and determine the ice melting order. Finally, the feasibility and rationality of the proposed method is verified by taking IEEE RBTS as an example.

3 Unilateral NMR sensor for assessing the aging status of composite insulator sheds

YANG Ting , YU Dengjie , XIA Yunfeng , YIN Chuangrong , YIN Cheng , XU Zheng , HE Wei

2017, 40(5):19-28. DOI: 10.11835/j.issn.1000-582X.2017.05.003

[Abstract](1147) [HTML](822) [PDF 3.58 M](1318)

Abstract:
Assessing the aging status of composite insulator sheds concerns the security and stability of power system. In order to realize nondestructive examination of the sheds of composite insulators at project site, the design of a portable unilateral NMR(nuclear magnetic resonance) sensor was proposed. We optimized the homogeneity of the static magnetic field and the RF(radio-frequency) coil to obtain high SNR(signal to noise ratio). The tested samples were the sheds of three composite insulators from 110 kV lines serviced for different years in the same area, and the standard CPMG sequence was employed. The measurement data was processed by both single exponential fitting and inverse Laplace transform. It shows that an increase of the service time of the composite insulators resulte in a decrease of the equivalent transverse relaxation time. Therefore, the portable unilateral NMR sensor has the potential to assess the aging status of composite insulator sheds.

4 Study on the laminar burning velocity of syngas based on OH-PLIF technology

PU Ge , ZHANG Xun , WANG Wending

2017, 40(5):29-35. DOI: 10.11835/j.issn.1000-582X.2017.05.004

[Abstract](950) [HTML](468) [PDF 4.77 M](1022)

Abstract:
In order to understand the combustion characteristics of the syngas, an experiment was conducted to research the structure, distribution of OH radicals and burning velocity of the syngas-air with OH-PLIF technology. Simulations were also conducted to analyze the chemical kinetics of the combustion process. The results show that the increasing fraction of CO will shrink the structure of the flame, while the height of inner flame varies a little. However, the increasing of H₂ will increase the burning velocity dramatically. The dominant reactions on the formation of OH radical are R36:CO+OH=CO₂+H, R43:H+O₂+M=HO₂+M and R45:H+HO₂=2OH.

5 Numerical study on the stiffness of corroded beam based on the cohesive model

CHEN Zhaohui , LEI Tingting , LIAO Minmao , SUN Rui

2017, 40(5):36-42. DOI: 10.11835/j.issn.1000-582X.2017.05.005

[Abstract](1208) [HTML](300) [PDF 1.65 M](1480)

Abstract:
Degradation of bond performance is one of the main factors that lead to the decrease of mechanical properties of corroded reinforced concrete members. Based on experimental study of bond behavior of corroded components and cohesive zone model, a bilinear cohesive element with thickness was established. A separation reinforced concrete beam analysis model was established and bonding interface layer was introduced in this paper to study the bonding performance degradation effect on the flexural stiffness of corroded RC beams. The results show that the bilinear cohesive element can effectively simulate the bond mechanism between steel and concrete. Moreover, the influence of the degree of corrosion on the bond performance can be reasonably described by the thickness of the bonding unit which is decided according to the depth of corrosion. Furthermore, numerical analysis results is compared with the experimental data and the theoretical results calculated by experiential method, and the results show that the method in this paper is effective and reasonable.

6 Vertical vibration modal analysis of long-span prestressed secondary beams floor system in gymnasium

HUANG Yin , PENG Junsen , LI Zhegang , XU Shitong , JIANG Wenjie , BAI Junyao

2017, 40(5):43-48. DOI: 10.11835/j.issn.1000-582X.2017.05.006

[Abstract](1184) [HTML](468) [PDF 6.99 M](1180)

Abstract:
The construction project 3^# (gymnasium) building of Core Area Primary School in Tongliang county in Chongqing was taken as the research subject. The vertical vibration modal of long-span prestressed secondary beams floor system was analyzed on simulation. Then the analysis results were compared with the measured results to evaluate the control effect of vertical vibration comfort, and the main conclusions include:the results of the modal analysis of the established accurate finite element model of the long-span floor on the basis of the modeling method are close to the measured results, and the relative error is about 5%. The simulation analysis and engineering measurement show that the first three order vibration modes of long-span floor are dominated by vertical vibration. The fundamental frequency of the structure meets the requirements of the current relevant codes in China, and the vertical vibration comfort conforms to the standard. Compared with the long-span floor which has no bottom plate, the first-order frequency has the smallest increase and it increases by 19.9% after adding bottom plate, which shows that the increase of bottom plate can effectively control the vertical vibration of long-span prestressed secondary beams floor system.

7 Flow simulation of ore and rock and structure parameter optimization of ore drawing of high stage block caving with multiple funnels

ZHU Zhonghua , HU Jie , TAO Ganqiang , WANG Liguan

2017, 40(5):49-59. DOI: 10.11835/j.issn.1000-582X.2017.05.007

[Abstract](1068) [HTML](345) [PDF 10.36 M](1178)

Abstract:
To master flow characteristics of ore rock of block caving with multiple funnels, the basis of stochastic property medium theory was presented. Based on the arrangement of ore drawing level, a simulation model of high-stage and multi-hopper discharge was extracted. Three probability models, i.e. four-block model, six-model and nine-block model, were used for different ore drawing boundary conditions. The particle flow data structure and null-block transfer model were established. The flow simulation process of ore rock flow of multi-funnel ore drawing was designed. The simulation program was developed with C++ programming language and hoops visualization toolbox. And flow characteristics of ore-rock under different funnel spacing were obtained in 3D visualization environment. It provides reference and basis for the design of bottom structure parameter and ore drawing control, and provides the basis for the preparation of the following ore drawing scheduling.

8 The correlation analysis of surface thermal environment and settlement characteristics in the hilly city

LYU Zhiqiang , PANG Rong , ZHU Jinsheng , DENG Rui , SHEN Liping

2017, 40(5):60-71. DOI: 10.11835/j.issn.1000-582X.2017.05.008

[Abstract](915) [HTML](601) [PDF 3.82 M](968)

Abstract:
Taking urban district of Chongqing as the research area, we analyzed the relationship between urban settlement characteristics and the surface temperature by using remote sensing image of Landsat 8 sensor OLI and TIRS as data source. The results show that the spatial distribution of the urban thermal environment is significant different. The elevation plays a much more role in affecting the urban land thermal environment than the topography The correlation between underlying surface parameters and the surface temperature show the piecewise linear relationship. The hot intensity of different land use types and thermal variation are significantly different, and the temperature and its variability of construction land are the highest among different land use types. In addition, the average temperature of water is the lowest, but its temperature variability is the highest. The grid analysis shows the water has obvious Cold Island Effect while the construction land has obvious Heat Island Effect. The increase of cultivated land and natural plant coved land stabilizes the analysis gird unit temperature.

9 Multiple gateway nodes selection of DHT-based hierarchy model

ZHANG Tai , WANG Sheng , CHAI Jiwen , XIANG Hong , LI Ke

2017, 40(5):72-80. DOI: 10.11835/j.issn.1000-582X.2017.05.009

[Abstract](864) [HTML](473) [PDF 2.81 M](1061)

Abstract:
A hierarchy model of multiple manager nodes based on DHT was proposed to solve the single-point problem and to improve the lookup efficiency of traditional hierarchical DHT, and then three lookup algorithms, i.e. the shortest path selection algorithm(SPSA), the minimum intra-group traffic based on hot potato algorithm(MIT_HP) and the load balancing with gateway selection algorithm(LBGS), were proposed. Simulation experiments were carried out to analyze lookup efficiency, intra-group traffic and load balance of the three algorithms. The simulation results show that the MIT_HP algorithm has the maximal lookup efficiency but has the worst load balance, the LBGS has the best load balance but has the worst lookup efficiency, and the performance of SPSA is between MIT_HP and LBGS. In addition, the paper presents performance comparison between MIT_HP and SPSA with random lookup algorithm which adopted by traditional hierarchical DHT.

10 Fisheye-view-based visualization of trajectory data

LUO Luojia , GUO Yan , WANG Yang , FU Kun

2017, 40(5):81-87. DOI: 10.11835/j.issn.1000-582X.2017.05.010

[Abstract](922) [HTML](901) [PDF 2.72 M](1139)

Abstract:
In the visual analysis of geo-spatial trajectories, analyzing are often done in a large scale, but traditional methods of trajectory visualization often lead to the loss of some important information at such a large level. This paper proposed a new method of magnifying details in large-scale geo-spatial trajectory visualization. We constructed several fisheye lenses with exponential functions, and applied these fisheye lenses to the areas with a high density of trajectories. At the same time, based on the drawing rule that layouts should be balanced, we proposed a layout of these lenses using the rate of density to determine the radius of each lens. The results shows that details are magnified and more information are presented to analysts after the applying of fisheye lenses.

11 An i-vector speaker recognition method based on spectrogram

FENG Huizong , WANG Yunfang

2017, 40(5):88-94. DOI: 10.11835/j.issn.1000-582X.2017.05.011

[Abstract](1097) [HTML](481) [PDF 2.84 M](1021)

Abstract:
An i-vector speaker recognition method using spectral features was proposed to solve the problem that there is always insufficient information when the mel-frequency cepstrum coefficients (MFCC) are used as feature vectors of i-vectors. Specifically, the speech signals are pre-emphasized, framed and windowed first, and then fed to the short-time Fourier transform to obtain spectrogram. These spectrograms are submitted into Gaussian universal background model for constructing the i-vectors in an appropriate low-dimensional linear subspace flow pattern. These vectors are conformed to normal distribution and reduced by linear discriminant analysis. Finally, Log-likelihood ratio (LLR) method is used for marking i-vectors in training and testing stage to complete the speaker recognition. Standard numerical experiment results with TIMIT database show that compared with recognition method using MFCC as features, the EER(equal error rate) of the method in this paper is lower.

12 Application of improved particle swarm optimization to numerical function optimization

LI Jianping , GONG Yaohua , LU Aiping , LI Panchi

2017, 40(5):95-103. DOI: 10.11835/j.issn.1000-582X.2017.05.012

[Abstract](955) [HTML](501) [PDF 2.63 M](1324)

Abstract:
To enhance the optimization ability of the particle swarm optimization (PSO), an improved PSO algorithm was proposed in this paper. In the proposed approach, the Beta distribution function is used to initialize population, and the inverse incomplete gamma function is used to update the inertia weight. For adjustment of velocity, a new operator based on differential evolution is introduced. For cross-border processing of particles, a new method based on boundary symmetry mapping is designed. With taking 50 different types of benchmark functions as optimization examples, the experimental results based on the Wilcoxon-Signed rank test show that the proposed algorithm is obviously superior to the common PSO, differential evolution, attificial bee colony algorithm and quantum-behaved particle swarm optimization algorithm.

13 Influencing factors on the hospital informatization

ZHANG Jinfang , LI Jiacheng , XIANG Youai , LUO Wanchun , REN Jiashun

2017, 40(5):104-110. DOI: 10.11835/j.issn.1000-582X.2017.05.013

[Abstract](968) [HTML](542) [PDF 1.90 M](1042)

Abstract:
It aims to analyze the influence of hospital informatization investment, operation and management on the hospital medical benefit. The data of informatization input, hospital operation management and medical gross income of a 3-A hospital in Chongqing during 20092015 was taken as the research object, and Pearson correlation analysis found that the medical gross is related to 11 indicators (P<0.05). Then the indicators with weight values greater than 0.08 were sifted by entropy method, including hospital annual financial information (x₁), the annual outpatient per year (x₄), hospital surgery per year (x₆), annual number of patients per year (x₇), and hospital primary title number (x₁₀), and their weights are 0.190, 0.086, 0.085, 0.084, 0.084 respectively. Finally, a multi-factor regression model was established, the fitting function of the indicators (x₁, x₄, x₆, x₇, x₁₀) and medical gross income was obtained, the coefficients of determination were 0.948 8, 0.927 1, 0.994 1, 0.993 0, 0.948 1 respectively and the determination coefficient of the regression equation of medical gross income is 0.9963. 5 indicators influencing medical gross income were obtained by entropy method, and the proposed regression equation can be used for hospital informatization investment decisions, which provides a new basis for medical and health management.

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