查看更多>>摘要：In the traditional environment,the factors for considering the location of the waste transfer station and the landfill are relatively fixed,and the scale of the problem is small.But in Internet of Things (IoT) environment,the waste storage in the household waste can be monitored in real time,the environmental data can be collected by means of emerging information technology,and the residents are more sensitive to the environmental pollution of the waste.Under such conditions,the method for location of traditional waste disposal facilities needs to be redeveloped to obtain a waste transfer station and landfill site that are suitable for the IoT environment.For this reason,a two-objective integer programming model is designed.The two objectives are lowest cost and minimum impact of waste on residents.The expectations of city managers and residents are considered into the modeling.Through the simulation experiments on different scale problems,the integration method for integer programming model and simulation system is verified to solve the location of waste transfer stations in IoT environment.
查看更多>>摘要：Safety accidents occure frequently during metro construction,which are mainly caused by human factors,and the incidence of accidents can be increased due to the overlap of human factors and physical factors.The human factors are taken as breakthrough to make early warning for the human insecurity factors in the metro construction,which can effectively reduce the occurrence of safety accidents.This paper proposes the principle of total monitoring and early-warning management.The unsafe behaviors in metro construction when approaching the hazardous area and non-standard safety prevention measures are analyzed to design and model the early warning process of unsafe behaviors in metro construction.Finally,the model is analyzed and verified using actual examples.
查看更多>>摘要：Breakthrough innovation is seen as a leading technology and industrial development direction,by which enterprises obtain the key for winning sustainable competitive advantage.In this paper,a chaos model is developed to examine how the breakthrough innovation evolves with the changed external environment ability and internal power.Numerical simulations based on chaos theory illustrate that the breakthrough innovation leads to chaos through the period-doubling bifurcation,and the chaos is the result of nonlinear interaction which is a qualitative change in the process between internal dynamics and external factors.The general conditions in which the breakthrough innovation comes to chaos instead of being in good order are gotten.The results show that the breakthrough innovation has chaotic characteristics and has a very sensitive dependence on the initial conditions in the process of running.The chaotic evolution can reflect the nonlinear character of the breakthrough innovation development and it can provide theoretical guidance for the application of chaos and chaotic control of innovation management.
查看更多>>摘要：The inter-sequence analysis method is a popular decision making method considering subjective information of the decision maker.The validity of this method is sensitive to the subjective information provided by the decision maker significantly.Thus,a new weighting method based on the inter-sequence analysis method is proposed.This new method can appropriately reduce the participation of the subjective judgment of the decision maker,and then accordingly decrease the influence of the subjective judgment to the results.It only needs the decision maker to give the inter sequence of the criteria.The importance comparison of two criteria is objectively determined by considering the ratio of a criterion being superior to another one.Some numerical examples are given to illustrate the calculation process of the new method.
查看更多>>摘要：For the problem of improving the efficiency and optimizing the resource allocation in urban elderly care,by using complex scientific management method and the empirical analysis on the efficiency of the urban elderly care modes,this paper proposes that the key is to balance supply efficiency between the long-term and short-term elderly care modes.The short-term pattern is to enhance urban residents' confidence,and the long-term one promotes the sustainable development of the elderly care to prevent the aged poverty due to oldness and illness.This paper suggests that the building of "government assistance + community leadership + enterprise cultivation" mode can improve the overall efficiency of the urban elderly care to reach the Pareto optima,and fulfil the goals of the urban elderly care by providing a security and enjoyable life.
查看更多>>摘要：In this study,we present the experimental laser welding of super-eutectic Zn-A1 (ZA) alloy.Microstructure characteristics of the ZA alloy's bond area welded by pulsed laser were investigated using an optical microscope,scanning electron microscope,energy diffraction spectrum and X-Ray diffraction.The results showed that the microstructures in the weld mainly consisted of threadlike columnar crystals,coarse dendrites and fine equiaxed grains.Secondary particles were produced in the interdendritic zones due to the composition segregation.A poor A1 area was formed in η grain inside while a rich Al area took shape outside the η grain.The occurrence of the composition segregation increased the grain boundary cracking tendency.The existence of a large number of η phases greatly increased the brittle of this material.The presence of many cleavage steps in the fractograph principally depended on the secondary cleavage effect between two cleavage cracks in different planes.The evolution of cracks along the twinning plane was the result of the secondary cleavage substituting for the twinning deformation in the vicinity of the crack tip.
查看更多>>摘要：Multiuser detection technology is currently one of the effective ways to suppress multiple access interference and near-far effects.Firstly,through selecting a simple compensation matrix,fast improved approximation power iteration (FIAPI) subspace tracking optimization algorithm is proposed.Secondly,for the disadvantage of high computational complexity of Kalman filtering algorithm,Kalman for blind adaptive multiuser detector based on FIAPI subspace tracking algorithm is designed.The simulation experiments show that the convergence and anti-interference ability of the blind adaptive multiuser detector based on FIAPI algorithm is greatly improved,and the average signal-to-interference ratio of the FAPI algorithm is improved by about 0.7 dB,which is higher than the average signal-to-interference ratio of the orthogonal projection approximation subspace tracking (OPAST) algorithm 2 dB or so.
查看更多>>摘要：State transition matrix is an important concept in modem control system.It studies the motion law of linear control system from initial state to any state at time t.In this paper,joining an engineering example,an approach to determine zero-input responses is developed,and the design of simulation experiments with the aid of Matlab is used to illustrate the physical meaning of it.Furthermore,during the engineering application,for the discrimination of state transition matrix,a discrimination method of state transition matrix is proposed based on related theorems and an effective method is derived by calculating characteristics during tedious verification of theorem.The simulation results have proved the correctness of system analysis by using such discrimination method under different parameter models.
查看更多>>摘要：In order to obtain the multiple-feedback filter with simpler structure and electronic control,this paper first derives nodal admittance matrix (NAM) equation of the multiple-feedback filter.Furthermore,in accordance with the pathological models of the operational transconductance amplifier (OTA) and second generation current-controlled conveyor (CCCII),the multiplefeedback filter based on OTAs and CCCIIs are respectively synthesized by the NAM expansion method.The filter employing three OTAs has eight equivalent realizations and the filter employing three CCCIIs has 16 equivalent realizations.24 different forms of the current-mode filters are synthesized in all.fo and Q of the synthesized filters can be tuned by tuning bias currents of the active elements.The hand analysis and computer analysis are ineluded to support the method to be utilized.
查看更多>>摘要：Process integration method is used to establish a composite model to perform computations of hybrid models for water quality assessment of Haihe River,and a resolution is presented to clear the long-term obscurity about the differences between single-factor assessment (SFA) and multifactor assessment (MFA) of water quality in this paper.Symbolic models were introduced to describe the types and orders of computations involved in SFA and such MFAs as Nemerow comprehensive index (NCI) and fuzzy comprehensive assessment (FCA).Facilitated by paired t-tests,the composite model of absolute distance (AD) was established to test the differences between SFA and MFAs on four water quality indicators (WQI).Matlab (R14) programs for these models were developed to perform integrative computations on 3 217 batches of water data obtained from seven monitoring sites of Haihe River from 2008 to 2017.Paired t-tests show that results of our SFA model (SFA-4) are not significantly different (p=0.926) from that of SFA based on all WQI,however,extremely significantly different from results ofNCI (p=0) and FCA (p=0).SFA-4 is proved by AD model to be farther away from FCA (AD-S--,F=1.075) than from NCI (AD-S→N=0.634).More than proving the deduction of SFA≥NCI≥FCA in most cases (p=0.885),the results from AD show that MFAs approach SFA when surface water becomes good (SFA=1) or worst (SFA=6),whereas depart to the farthest distance from SFA when surface water becomes worse (SFA=3).To sum up,the integrative computations involved in AD model on the water data are effective and efficient (improved by 44.2％).Furthermore,AD model shows the differences between SFA and MFAs clearly.
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