In the process of social network data collection and release, privacy information leakage often takes place so that social network privacy protection has aroused people’s concern. In order to solve the problem of significant data loss and poor availability of data in a single mode of social network privacy preserving method ,a k-isomorphism and locally randomized method of privacy preserving is proposed, which included the optimized k-isomorphism method and locally randomized method. The experimental results show that the proposed method in this paper could effectively resist information loss, and has good performance in measurement of harmonic mean of the shortest distance and sub-graph centrality of information within graph. It can protect user’s privacy information effectively and improve the usability of data issued, and also can effectively resist recognition attack from attacker based on background knowledge of graph structure.

Principal component analysis (PCA) is applied to image hashing algorithm and a perceptual hashing algorithm based on characteristic distance is proposed. In the proposed algorithm, a secondary image suitable for data dimension reduction is first constructed from the normalized image. Then, PCA is used to process secondary image, and the distance between PCA features is finally exploited to form image hash. Experimental results illustrate that classification performance of the proposed algorithm measured with receiver operating characteristics (ROC) curve is better than those of three existing hashing algorithms. Copy detection under a large-scale image database shows that the proposed algorithm has good performance in detecting image copies.

To solve the problem that existing area coverage control algorithms for the mobile WSNs are difficult to ensure the network connectivity rate of the network coverage and energy consumption optimization, an area coverage control algorithm based on connected dominating set (ACCBCDS) algorithm is proposed for the mobile WSNs. When the nodes are randomly distributed in the monitoring area, nodes disconnected to the Sink node are required to move toward the Sink node until full network connectivity is achieved. Then the three-staining method is adopted to construct the network connected dominating set, after which the Sink node performs centralized optimization adjustment on dominated nodes, requiring dominated nodes to move toward better locations. During the adjustment, network coverage rate, connectivity rate and node movement distance are synthetically considered. Simulation results show that compared with typical area coverage control algorithm based on virtual forces (ACCBVF) algorithm, the proposed ACCBCDS can achieve higher network coverage rate under the premise of ensuring full network connectivity, and decrease node movement energy consumption during network coverage control.

Fuzzy function is an important tool for the performance analysis of ultrasonic testing systems. In this paper, the ultrasonic Gaussian model is proposed at first. Then, the fuzzy function of the ultrasonic signal for Gaussian model is derived in detail. Finally, the resolution of time and frequency for an ultrasonic testing system is analyzed, which is related to distance of detection target and speed of moving target. Reference for selecting parameter value of an ultrasonic testing system is provided. Theoretical derivation and simulation results show that it is better to discern moving targets by using a narrow bandwidth signal. And for distinguishing short-range targets, a short-duration signal is ideal.

Using algorithms based on CP frequency offset estimation and PSS frequency offset estimation, OFDM synchronization of LTE system is studied and the two algorithms are compared. According to the characteristics of the traditional algorithm based on CP frequency offset estimation algorithm, protection interval is selected as a quarter of the relevant window, and then is conjugate within the relevant window, finally the algorithm is improved by calculating the average value. Simulation results show that compared with the traditional CP algorithm, the performance of the improved CP algorithm reduces the mean square error by two orders of magnitude.

VaR(value at risk) and ES(expected shortfall) are used to measure the loss of financial investment. It is interesting to investigate the estimation of VaR and ES. In this paper, VaR and ES are estimated by Baysian empirical likelihood method. Some properties,such as consistence and asymptotic normality,are given. Simulation studies show that,with some prior information,Baysian empirical likelihood is a better method.

Twelve compounds were isolated from fruit of Dimocarpus longan Lour. They were identified by physicochemical properties and spectral analyses as stigmasteryl stearate, α-amyrinpalmitate, hexadceanoic triglyceride, 3-capryloxytetradecanoic acid tetradecyl ester, myristin, 1,3-dimyristin, β-sitosterol, monomyristin, lauric acid, β-daucosterol, sucrose, and caprolactam. Among them, stigmasteryl stearate, α-amyrinpalmitate, hexadceanoic triglyc-eride, 3-capryloxytetradecanoic acid tetradecyl ester, myristin, 1,3-dimyristin, monomyristin, lauric acid, and caprolactam were isolated from this plant for the first time.

Under ultrasound, vodiamine, mulberry, pomelo and banana were respectively extracted with acetone, ethanol, water and ethyl acetate solvents to offer vodiamine extract (EAE, EEE, EWE and EAEE), mulberry extract (MAE, MEE, MWE and MAEE), pomelo peel extract (SPAE, SPEE, SPWE and SPAEE), pomelo flesh extract (SFAE, SFEE, SFEW and SFAEE), banana flesh extract (BAE, BEE and BWE) and banana peel extract (BPAE, BPEE, BPWE and BPAEE). Their antioxidant activities were evaluated, employing DPPH·, ABTS⁺·, O^-₂· and OH· methods, respectively. The results showed that all IC₅₀ of vodiamine extract, mulberry extract, pomelo extract and banana extract were much lower than the standard value 10 g/L in these four assays, indicating good antioxidant activities of these extracts. In addition, the extracts solvents had important influence on their antioxidant activities.

Under ultrasound, Taxus chinensis var. mairei were extracted with ethanol at 80 ℃ to offer ethanol extract (EE). EE was further extracted with chloroform and separated by column chromatography to offer taxol. Their antioxidant and antitumor activities were then evaluated. The antioxidant activity screening results showed that EE exhibited better scavenging activity than the common antioxidant BHT in these four assays, with IC₅₀ of 13.19±1.50, 2.65±0.35, 25.33±1.75 and 343.00±2.13 mg/L, respectively, while taxol showed the worst, indicating excellent antioxidant activity of EE. The antitumor activity screening results demonstrated that taxol showed better inhibition than EE, with IC₅₀ of 3.45±1.37, 6.20±0.88, 1.98±0.49 and 1.15±0.27 mg/L, respectively.

Using Bi(NO₃)₃·5H₂O and Na₂WO₃·2H₂O as raw materials, Bi₂WO₆ was successfully synthesized by hydrothermal method with ethylenediamine tetraacetic acid (EDTA) as the chelating agent. The properties of the as-prepared samples were investigated by XRD, SEM, Raman and UV-vis DRS tests. The as-prepared products were used to photodegrade tannery wastewater. The effects of dosage of Bi₂WO₆ photocatalyst, air flow rate, pH of wastewater, H₂O₂ dosage and the illumination intensity on the wastewater degradation were investigated in detail. The results showed that highly crystallinity square flower-like Bi₂WO₆ with its band gap of 2.696 eV could be obtained via a hydrothermal route assisted by EDTA. The Bi₂WO₆ could effectively degrade the hardly-degraded organic pollutants, and the COD_cr removal rate increased significantly. The optimum conditions of treatment of tannery wastewater were natural pH value, Bi₂WO₆ of 2 g/L, H₂O₂ of 2%, amount of air of mid-range, distance of light liquid light of 11 cm, reaction time of 3.0 h. Under the optimal conditions, the decolorization rate and COD_cr removal rate were 91.5% and 92.6%. The dynamic behavior of Bi₂WO₆ photocatalyst degrading the molasses fermentation wastewater agrees with the first-order rate dynamic equation.

Mass freeway toll data contain various traffic information and are readily available. This paper analyzes the difference of travel time distributions of freeway passenger car and freight car and constructs different reliability estimation models for them. Then the paper fit above data with normal and lognormal distributions using MATLAB. The result shows that it’s acceptable to analyze the distributional characteristics of travel time for passenger car and freight car with normal distribution. The SSE, RMSE, and R-square of travel time distribution are better by model method than those by direct method. Finally, the reliability interval of both types of cars are compared and the result shows that it is more stable with model method under the same probability.

Considering the influence of external noise input and network induced delay, the H_∞ guaranteed cost control of networked control systems is studied. Based on the network transmission environment, the networked control system with time-vary and delay is modeled as a kind of closed loop discrete system with time varying parameters. Then, using the Lyapunov theory, the conditions for the existence of guaranteed performance indexes of H_∞ are derived. Based on the principle of linear matrix inequality (LMI), the design method of guaranteed cost controller H_∞ is proposed. Finally, the simulation results show that the guaranteed cost controller H_∞ can effectively improve the robustness of the network control system, and can maintain the performance index of the system. The validity and feasibility of this method are then proved.

The altitude of Quadrotor Unmanned Aerial Vehicle (QUAV) is easy to be disturbed by the factors such as the external air flow during the flight, which leads to the instability of the flight attitude and impacts the quality of the preset flight mission. Aiming at the characteristics of the traditional PID control failing to adaptively adjust the control parameters, firstly, this paper studies the method of the combination between elitist ant colony system algorithm and PID control, and then proposes a method of improved elitist ant system algorithm to combine with PID control, respectively, to achieve QUAV’s altitude control during the flight under disturbance, finally the simulation experiment comparison is carried out. Simulation experimental results show that the improved elitist ant colony system algorithm that optimizes the parameters of PID control can not only get optimum valve in a short time and improve the speed of convergence, but also have a better performance of anti-disturbance and robustness.

As the existing cell images segmentation algorithms are sensitive to noise and traditional SLIC(simple linear iterative clustering) algorithm can not divide boundary precisely, an improved SLIC method based on region merging is proposed to resolve the problems. First, the mean shift treatment is used to eliminate noise on the cervical cell images, then the two-dimensional otsu adaptive threshold processing is conducted to abtain the initial contour, then based on SLIC algorithm the superpixel region is obtained, and the superpixel regions are fused to the original image to complete the initial segmentation. Finally, in the initial segmentation map, the initial mark is used to obtain the mutual information, and the maximum similarity criterion is used to merge. In this way, no present threshold is needned. The non-marker background regions are merged with labeled automatically, while the non-marker object regions are identified and avoided from being merged with background. Several experiments of dividing the cytoplasm are conducted for cervical cells images. The proposed algorithm can extract cytoplasm from a single-cell cervical smear image more accurately in a relatively short time.

In the scene of integrated network, the traditional inter-domain routing protocol BGP, which based on TCP, is difficult to satisfy the request of frequently switching of network topology structure and the fast establish of BGP neighbors. According to the need of quickly establishing the BGP neighbor between the terrestrial networks, an inter-domain routing protocol BGP-U which based on UDP is realized. The BGP state machine aimed at integrated network is discussed, and the key data structure and the interaction processes of neighbor relationship which are realized by the requesters and servers of BGP-U are provided. The simulation shows that, compared to the traditional BGP, the BGP-U which based on UDP is useful for the rapid establishment of BGP neighbor relationship with large-scale terrestrial networks, and BGP-U enjoys better concurrency response performance.

Let G be a cyclic group with prime order,Z_n[i] be the Guassian integers modulo n and Z_n[i]G be the group ring of G over Z_n[i]. Properties of the zero-divisor graph of Z_n[i]G are investigated in this paper and the girth,the planarity and the diameter of the zero-divisor graph of Z_n[i]G are completely characterized respectively.

Polyimide has excellent mechanical properties, heat resistance and chemical stability. Although its porous film is one of the best lithium-ion battery separators, the porous polyimide film prepared by removing CaCO₃ particles (as pore-foaming agent) out from polyimide/ CaCO₃ composite was brittle. In order to explore the reasons for its poor mechanical properties, the polyimide/ CaCO₃ composite materials and the related porous polyimide materials were characterized by XRD and IR spectroscopy. The results showed that:the pore-foaming agent CaCO₃ particles could be removed selectively from the polyimide/ CaCO₃ composite materials by 1:1 hydrochloric acid. The imidization extent of polyimide materials was only 80% when CaCO₃ particles were added as pore-foaming agent.

After the gradient acclimation and enrichment screening, 348 strains were isolated from environmental samples using trans-anethole as the sole carbon source. Through quantitative detection of trans-anethole and anisic acid with the methods of TLC and RP-HPLC, a strain named WGBF9 with the highest tolerance to trans-anethole and maximum yield of anisic acid was obtained. Biomass of strain WGBF9 was 37.42% of the blank control when the seed culture medium contained 10% (v/v) trans-anethole, and the biomass reached 26.57% in the medium with 20% (v/v) trans-anethole, showing that the strain had a high tolerance to the trans-anethole. Anisic acid molar generation rate is 17.9%, when the strain was cultured in the screening secondary medium, with rotate speed of 200 r/min, after 36 h fermentation under 30 ℃. WGBF9 was identified as a subspecies of Pseudomonas putida biotype A based on the analysis of physiological and biochemical experiments.

Four species and one variety of seed plants are reported as new records from Guangxi Zhuang Autonomous Region, viz.:Actinodaphne lecomtei C. K. Allen, Polygala subopposita S. K. Chen, Campanula dimorphantha Schweinf., Didymocarpus stenanthos C. B. Clarke var. pilosellus W. T. Wang, Microtoena patchoulii (C. B. Clarke ex Hook. f.) C. Y. Wu et Hsuan. Voucher specimens and distribution and the images for taxonomic identification are also provided.

It is reported that a new distribution point of Teinopalpus aureus, a national grade-I protected species in China, was found in a mountainous area in Rongshui County, Guangxi. A male butterfly of the Teinopalpus aureus was photographed. Morphological characteristics and conservation value of the butterfly was introduced briefly, hoping that relevant departments will pay attention to the new distribution point, and take effective measures to protect it.

In order to study the thermoregulation and resting metabolic rate of Fejervarya multistriata, the oxygen consumption of F. multistriata was determined in laboratory using the open type respiration measurement instrument for determining the RMR. The results showed that the body temperature and RMR under different ambient temperature (10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃, 35 ℃) between the male and female F. multistriata were not significantly different (P>0.05). The body temperature of F. multistriata had significant positive correlation with the ambient temperature (10～35 ℃), the linear equation was T_b=0.881 7T_a-1.355 2 (r²=0.996 1,F_1,6=1 009.98,P<0.01). The η_RMR of F. multistriata increased with the ambient temperature (10～35 ℃), the equation was η_RMR=3.176-0.314T_a+0.01T_a²(r²=0.976,F_1,6=18.251,P=0.021). The η_RMR of F. multistriata had significant negative correlation with the weight in 20 ℃, 30 ℃, 35 ℃, the correlation coefficients were -0.449, -0.523 and -0.512 respectively. The results indicated that the body temperature and η_RMR of F. multistriata changed with the ambient temperature, showing the characteristics of body temperature and metabolism of the cold-blooded animals, and the ability of conducting the body temperature by physiological thermoregulation.

Using micro plate method to isolate the influenza virus, Influenza B virus and its HA1 gene were identified by RT-PCR and Nested-PCR,The nucleotide sequence of HA1 gene were analyzed by Clustax, Mega6.0,Megalign. Results:47 influenza B positive samples were isolated from 1 002 fever samples collected from April, 2014 - to March, 2015. The highest isolation rate was found in August 2014, and January, 2015. The highest influenza B positive was found in 13~24 months old children,and the lowest positive rate was found in 0~6 months old children. There is no significant difference among children patients with influenza B virus infection in either-gender or departments source:87.23% of children of the Influenza B virus infection show the symptoms of fever and cough. HA1 fragment analysis indicates the isolated influenza B virus belongs to the Victoria strain, and shows a 86.1%~88.0% homology to the reference strain, B/Brisbane/60/2008 in nucleotide sequence. Three amino acids of the isolated strain were different from the reference strain. Conclusion:Influenza B virus isolated in Wuhan belongs to the Victoria strain, which has high homology with the international vaccine strain B/Brisbane/60/2008 and B/Texas/AF2741/2010 in the northern hemisphere and INFB representative strains in Hubei province. No new strain was found.

Most previously studies on chronic smokers are transversal studies based on task paradigm. In this study, longitudinal studies of regional brain activity alterations between smoking and quitting smoking for some time in resting state are carried. Twelve healthy chronic smokers participated in this study and were imaged with resting state functional magnetic resonance imaging (fMRI) in two stages, i.e., under smoking and after quitting smoking for one week. Then regional homogeneity (ReHo) method was used to conduct a comparative analysis of the statistics of the two stages. Compared with those in smoking state, smokers who had quitted smoking for one week showed decreased level of ReHo in frontal lobe (orbital, medial, middle), left precuneus, left posterior cingulate cortex (PCC), left cuneus, and right supplementary motor area, as well as increased level of ReHo in bilateral superior temporal gyrus, left calcarine, left lingual gyrus, left fusiform gyrus, left parahippocampa gyrus, right postcentral gyrus, and left putamen. The results indicate that coherence of neural activities have been altered in the above brain regions after quitting smoking for one week among the chronic smokers, which offers references for the application of ReHo in smoking cessation therapy.

Knowing the changes of ecological landscape in lake areas of arid region is of particular importance to monitor land use change and adjust land use strategies. The current study focuses on Ebinur Lake region, Xinjiang, which suffers from severe salinization and desertification in recent years, to generate land use changing maps using Landsat-TM multispectral images of 1990, 2001 and 2011. Three commonly used classification approaches were compared, i.e., Maximum Likelihood Classification (MLC), Decision Tree Classification (DTC), and Support Vector Machine (SVM), to generate landscape metrics for stndying the landscape change during the past two decades in Ebinur Lake area. Three findings emerge from the study. First, among the three classification approaches, SVM produces the most accurate classification. For the year of 1990, 2001, and 2011, the classification accuracy rates are 97.312 3%, 97.778 2%, and 95.082 1%, respectively, Kappa coefficients are 0.963 2, 0.884 2, and 0.918 7, respectively. Second, for the past two decades, salinized and desertified lands are increasing drastically (salinized land increased 374.471 4 km²), along with increased cultivated land. While forest, grassland, water body and other land use types decrease in the same period, with grassland lost over 366.868 8 km². Third, there is a significant landscape difference among different periods. In general, calculated landscape metrics such as landscape density, maximum patch index, isolation index, Shannon diversity index and Shannon evenness index are increasing during the two decades. On the other hand, area weighted index, mean patch distance index, contagion index, interspersion juxtaposition index and patch cohesion index are decreasing. It seems that the landscape of study area becomes more fragmented during the study period, which leads to relatively higher diversity, and more even distribution of various land use types. Our study results also suggest that the current landscape distribution is relatively stable and even. However, the increasing salinization and desertification of land due to increased human activities (cultivation) requires close monitoring and constant evaluation.