Compound event barrier coverage in wireless sensor network by Yao-ming ZHUANG, Cheng-dong WU, Yun-zhou ZHANG, Shi-guang WEN

“…In wireless sensor networks (WSN),more and more people utilize barrier coverage to monitor compound events.The data of compound event barrier coverage (CEBC) comes from different types of sensors.It will be subject to multi-constraints under complex conditions in real-world application.Aiming at the merging problem of compound event confidence,a computational model based on joint probability density was proposed.In order to solve the optimization problem of compound event barrier coverage under multiple complex constraints,an active set multiplier policy (ASMP) was proposed.The algorithm can calculate the coverage ratio efficiently and allocate the sensor resources reasonably in compound event barrier coverage.The algorithm can simplify complex problems to reduce the computational load of the network and improve the efficiency of the network.The simulation results demonstrate that the ASMP algorithm is more efficient in the allocation of sensor resources and network optimization.…”
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Reservas de valor na Amazônia: Uma análise da intersecção entre desmatamento e rentismo by Bruno Valdambrini, Angelita Matos Souza

“…The data collected lends support to the hypothesis that following the clearance of the forest, the land remains stable, likely serving speculative interests driven by the phase of financialized capitalism and supported by state regulatory instruments. Furthermore, the calculation of CO₂ emissions is explored, connecting the analysis to the global dynamics of climate change influenced by human activity.…”
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A Method for Determining the Mesh Stiffness of Internal Gear by Combining Finite Element Method and Contact Theory by Chang Lehao, Tian Hongwei, He Zhaoxia, Liu Geng

“…The local contact deformation is calculated by using the analytical formula for a line contact problem. …”
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Study on the Vector Quadrilateral Isoparametric Shell Element with Shear Deformation by Zhen Wang, Yang Zhao, Zhi Ding, Huiping Tang

“…On this basis, the nonlinear calculation and analysis program of the quadrilateral isoparametric shell element is developed. …”
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Spatial Dependency of Eco-Efficiency of Agriculture in São Paulo by Carlos Rosano Peña, Carlo Aleksandr Rosano de Almeida, Evaldo César Cavalcante Rodrigues, André Luiz Marques Serrano

“…The study also used the tools of exploratory spatial data analysis to verify the spatial autocorrelation and spatial heterogeneity of the calculated index. The results indicate that, on average, the analyzed municipalities are able to expand the production and forested areas by 59% and also to reduce degraded areas and inputs in the same proportion. …”
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STABILITY ANALYSIS OF DEFECT AROUND PARTICLES IN EUTECTIC COMPOSITE CERAMIC by YU JinFeng, LIU XieQuan, NI XinHua, FU YunWei

“…Based on the equivalent inclusion method and the interaction direct derivative（ IDD）estimate,stress intensity factor of annular defect under residual stress field and applied loading was calculated,and annular defect stability was analyzed. …”
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Dividend-Based Labor Remuneration and Tradable Shares in Worker Cooperatives by Ermanno C. Tortia

“…This paper analyzes the possibility of creating worker cooperatives in which members are paid not through wages but through dividends calculated on the organization’s residual income, as stipulated by the economic theory of the labor-managed firm. …”
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Some examples of nontrivial homotopy groups of modules by C. Joanna Su

“…In this paper, we deliver and carry out the precise calculation of the first known nontrivial examples of absolute homotopy groups of modules, namely, π¯n(ℚ/ℤ,ℚ/ℤ),  π¯n(ℤ,ℚ/ℤ), and π¯n(ℤ,ℤ), where ℚ/ℤ and ℤ are regarded as ℤCk-modules with trivial action. …”
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1:2 PARAMETRIC RESONANCE OF MICRO-BEAN SYSTEM SUBJECTED TO NARROW-BAND RANDOM EXCITATION by YANG ZhiAn, ZHAO KaiYuan

“…The first order and second order steady state response of the system are obtained and the corresponding to the amplitude-frequency curves are calculated. The influence of the system parameters on the response of the micro-beam is analyzed. …”
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Multiaxial fatigue of in-service aluminium longerons for helicopter rotor-blades by A. Shanyavskiy, A. Toushentsov

“…Complicated case of in-service blades multiaxial cyclically bending-rotating and tension can be considered based on introduced earlier master curve constructed for aluminum alloys in the simple case of uniaxial tension with stress R-ratio near to zero. Calculated equivalent tensile stress was compared for different blade sections and it was shown that in-service blades experienced not principle difference in this value in the crack growth direction by the investigated sections. …”
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RESEARCH ON THE ENERGY HARVESTING OF DIELECTRIC ELECTROACTIVE POLYMER TRANSDUCER by ZHU YinLong, XI Shuang, SU XiaoFang, LIU Ying, WANG HuaMing

“…With the force-stroke of generator,the energy generated and energy conversion efficiency were calculated. It is demonstrated that the stretch displacement and bias voltage are the main factors influencing the amount of electrical energy generated and the efficiency of energy conversion. …”
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Study on Internal Fatigue Crack Initiation and Propagation Direction of Wind Turbine Gearbox Bearings by Haibo Sun, Feng Shen

“…Through theoretical research，it is believed that the direction of crack initiation depends on the direction of the maximum shear stress amplitude plane at the local initiation position. After calculation，it is found that the orthogonal shear stress amplitude of the shallow layer inside the bearing raceway is greater than the principal shear stress amplitude，and the principal shear stress amplitude at the deeper layer is greater than the orthogonal shear stress amplitude. …”
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Fault Diagnosis of Transmission Shaft System of Automobile based on VMD and PSO-SVM by Fei Wu, Jun Ding, Suhang Liu, Xiong Lu

“…Then, the energy value of IMF and the corresponding energy entropy are calculated. Finally, Particle swarm optimization（PSO） is used to optimize the parameters of support vector machine（SVM）, and the energy value and energy entropy of normalized IMF are input into the PSO-SVM to identify the working state and fault type of transmission shaft system. …”
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Simulation Analysis of the System Reliability of Cylinder Sine Oscillating Tooth Transmission by Yuan Xinmei, Zeng Yunyun, Zhou Sizhu

“…In view of the problem that the conventional analysis method cannot directly solve reliability problem of the complex cylinder sine oscillating tooth transmission system,a simulation method based on minimal cut sets of fault tree is proposed,which can solves system reliability.According to the structural characteristics of cylinder sine oscillating tooth transmission,the function block diagram of the system is given and the fault tree of the system is built.The minimal cut sets of the fault tree are acquired,and the cumulative failure probability and the probability density are calculated.Different types life distribution function of the system are fitted out.The life distribution function is determined preliminarily based on the principle of minimum residual sum of squared,and the K-S hypothesis testing is carried out for the life distribution function,which ultimately determine life distribution function of cylinder sine oscillating tooth transmission is Weibull distribution.The weak links of cylinder sine oscillating tooth transmission system are determined by analysis of model importance.…”
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REVERSE REALIZATION OF PITCH CURVE ON CONJUGATE CAM WITH HIGH SPEED BEATING-UP by QIU HaiFei

“…The reasonable values of basic circle radius and roller are determined through calculating radial direction r0 and radius of curvature ρ0 of the curve point by point. …”
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Hiss noise reduction method used for audio signals based on AAC bit-stream by Feng DENG, Chang-chun BAO, Feng BAO

“…A hiss noise reduction method used for audio signals based on AAC bit-stream in compressed domain was proposed.The input was AAC bit-stream derived from noisy audio signals,and the output was the enhanced AAC bit-stream used for decoder.First,Hiss noise was estimated by modified median absolute deviation (MMAD).Second,the auditory masking threshold and the masking parameters were calculated by modified discrete Flourier transform (MDFT).Finally,the parametric soft-thresholding method was employed to obtain the enhanced AAC bit-stream which was used to get the enhanced audio signals at AAC decoder.The objective and subjective quality testing results indicate that the proposed algorithm can effectively remove the Hiss noise derived from AAC bit-stream of audio signals and ob-viously outperforms the existing hiss noise reduction methods.…”
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Evaluation of the Motor Function of Sling Exercise Therapy in Children with Cerebral Palsy by Chuntao ZHANG, Zhenhuan LIU, Shangsheng DONG

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Simulation Research of the Solid Filling Hydraulic Support Hangs Scraper Conveyor by Zhang Dongsheng, Yuan Shuai, Yuan Zhi, Song Qiushuang, Gao Hao

“…According to the result of finite element analysis and statics analysis and calculation,by using n Code software,the fatigue strength analysis is carried out on the scraper chain,the life and injury cloud chart are obtained,it in line with the finite element analysis results and can satisfy the requirements of use.…”
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The Effect of Fines and Temperature on the Mode I Fracture Characteristics of the Frozen Sand by Bumsik Hwang, Wanjei Cho

“…In order to investigate the effect of fine and temperature on the fracture characteristics of the frozen sand, the stress intensity factor and fracture energy were calculated using three-point bending test results. Based on the test results, fine contents and temperature can affect the brittle and ductile responses of the frozen sand. …”
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Guiding the security protection of critical information infrastructure with scientific network security concept by Yangzhao LI, Changxiang SHEN, Nan TIAN

“…In the current increasingly competitive international cyberspace security game,critical information infrastructure is facing a severe security situation.From the view of scientific principle,the essence of network security risk is the limitation of people’s cognitive logic of information science.It is impossible to build a solid network defense system,and it is not necessarily cost-effective from the view of economic benefits.In network security work,the most important thing is the convergence of security objectives.The key is to ensure that the logical combination of computing tasks is not tampered with or destroyed,and to achieve correct calculation.Focusing on this security goal,scientific and technological innovations were made in such aspects as logical correct verification theory,computing architecture and application mode of computing engineering.The problem that logical defects were not exploited by attackers was solved,a unity of offensive and defensive contradictions was formed,and the active immunity capability for information systems was established.…”
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