Showing papers by "Beijing Wuzi University published in 2015"

Coherently coupled solitons, breathers and rogue waves for polarized optical waves in an isotropic medium

Abstract: Under investigation in this paper is a coherently coupled nonlinear Schrodinger system which describes the propagation of polarized optical waves in an isotropic medium. By virtue of the Darboux transformation, some new solutions have been generated on the vanishing and non-vanishing backgrounds, including multi-solitons, bound solitons, one-breathers, bound breathers, two-breathers, first-order and higher-order rogue waves. Dynamic behaviors of those solitons, breathers and rogue waves have been discussed through graphic simulation.

Modulational instability, higher-order localized wave structures, and nonlinear wave interactions for a nonautonomous Lenells-Fokas equation in inhomogeneous fibers

Abstract: In this paper, the nonautonomous Lenells-Fokas (LF) model is investigated. The modulational instability analysis of the solutions with variable coefficients in the presence of a small perturbation is studied. Higher-order soliton, breather, earthwormon, and rogue wave solutions of the nonautonomous LF model are derived via the n-fold variable-coefficient Darboux transformation. The solitons and earthwormons display the elastic collisions. It is found that the nonautonomous LF model admits the higher-order periodic rogue waves, composite rogue waves (rogue wave pair), and oscillating rogue waves, whose dynamics can be controlled by the inhomogeneous nonlinear parameters. Based on the second-order rogue wave, a diamond structure consisting of four first-order rogue waves is observed. In addition, the semirational solutions (the mixed rational-exponential solutions) of the nonautonomous LF model are obtained, which can be used to describe the interactions between the rogue waves and breathers. Our results could be helpful for the design of experiments in the optical fiber communications.

Development of population structure and spatial distribution patterns of a restored forest during 17-year succession (1993-2010) in Pingshuo opencast mine spoil, China.

Abstract: Afforestation of native tree species is often recommended for ecological restoration in mining areas, but the understanding of the ecological processes of restored vegetation is quite limited. In order to provide insight of the ecological processes of restored vegetation, in this study, we investigate the development of the population structure and spatial distribution patterns of restored Robinia pseudoacacia (ROPS) and Pinus tabuliformis (PITA) mixed forests during the 17 years of the mine spoil period of the Pingshuo opencast mine, Shanxi Province, China. After a 17-year succession, apart from the two planted species, Ulmus pumila (ULPU), as an invasive species, settled in the plot along with a large number of small diameter at breast height (DBH) size. In total, there are 10,062 living individual plants, much more than that at the plantation (5105), and ROPS had become the dominant species with a section area with a breast height of 9.40 m(2) hm(-2) and a mean DBH of 6.72 cm, much higher than both PITA and ULPU. The DBH size classes of all the total species showed inverted J-shaped distributions, which may have been a result of the large number of small regenerated ULPU trees. The DBH size classes of both ROPS and PITA showed peak-type structures with individuals mainly gathering in the moderate DBH size class, indicating a relatively healthy DBH size class structure. Meanwhile, invasive ULPU were distributed in a clear L shape, concentrating on the small DBH size class, indicating a relatively low survival rate for adult trees. Both ROPS and PITA species survival in the plantation showed uniform and aggregated distribution at small scales and random with scales increasing. ULPU showed a strong aggregation at small scales as well as random with scales increasing. Both the population structure and spatial distribution indicated that ROPS dominates and will continue to dominate the community in the future succession, which should be continuously monitored.

Quantitative Function and Algorithm for Community Detection in Bipartite Networks

Abstract: Community detection in complex networks is a topic of high interest in many fields. Bipartite networks are a special type of complex networks in which nodes are decomposed into two disjoint sets, and only nodes between the two sets can be connected. Bipartite networks represent diverse interaction patterns in many real-world systems, such as predator-prey networks, plant-pollinator networks, and drug-target networks. While community detection in unipartite networks has been extensively studied in the past decade, identification of modules or communities in bipartite networks is still in its early stage. Several quantitative functions proposed for evaluating the quality of bipartite network divisions are based on null models and have distinct resolution limits. In this paper, we propose a new quantitative function for community detection in bipartite networks, and demonstrate that this quantitative function is superior to the widely used Barber's bipartite modularity and other functions. Based on the new quantitative function, the bipartite network community detection problem is formulated into an integer programming model. Bipartite networks can be partitioned into reasonable overlapping communities by maximizing the quantitative function. We further develop a heuristic and adapted label propagation algorithm (BiLPA) to optimize the quantitative function in large-scale bipartite networks. BiLPA does not require any prior knowledge about the number of communities in the networks. We apply BiLPA to both artificial networks and real-world networks and demonstrate that this method can successfully identify the community structures of bipartite networks.

Modulational instability, nonautonomous breathers and rogue waves for a variable-coefficient derivative nonlinear Schrödinger equation in the inhomogeneous plasmas

Abstract: Under investigation in this paper is a variable-coefficient derivative nonlinear Schrodinger (vc-DNLS) equation modeling the nonlinear Alfven waves in the inhomogeneous plasmas. The modulation instability is examined for this inhomogeneous nonlinear model. The nonautonomous breather and rogue wave solutions of the vc-DNLS equation are obtained via the modified Darboux transformation. It is found that the velocity and amplitude of the breather can be controlled by the inhomogeneous magnetic field and nonuniform density. Such novel phenomena as breather amplification and nonlinear Talbot effect-like property are demonstrated with the proper choices of the inhomogeneous parameters. Furthermore, dynamics of the fundamental rogue wave, periodical rogue wave, and composite rogue wave are graphically discussed. The trajectories and amplitudes of the rogue waves can be manipulated by the inhomogeneous magnetic field and nonuniform density. In addition, the nonlinear tunneling of the rogue waves and breathers is studied. As an application, a sample model is treated with our results, and the graphical illustrations exhibit the compressing, expanding, and fluctuating phenomena of the Alfven rogue waves.

Breather interactions, higher-order rogue waves and nonlinear tunneling for a derivative nonlinear Schrödinger equation in inhomogeneous nonlinear optics and plasmas

Abstract: Under investigation in this paper is a variable-coefficient derivative nonlinear Schrodinger (vc-DNLS) equation governing the femtosecond pulses in the inhomogeneous optical fibers or nonlinear Alfven waves in the inhomogeneous plasmas. Higher-order breather and rogue wave solutions of the vc-DNLS equation are obtained via the variable-coefficient modified Darboux transformation. Two types of the breather interactions (the head-on and overtaking collisions) are exhibited with different spectral parameters. By suitably choosing the inhomogeneous functions, the parabolic breather, periodic breather, breather amplification and breather evolution are demonstrated. Furthermore, the characteristics of the higher-order fundamental rogue wave, periodic rogue wave and composite rogue wave are graphically discussed. Additionally, the nonlinear tunneling of the higher-order breathers and rogue waves are studied.

Semirational solutions and baseband modulational instability of the AB system in fluid mechanics

Abstract: Under investigation in this paper is the AB system describing marginally unstable baroclinic wave packets in geophysical fluids. By means of the n -fold modified Darboux transformation, the semirational solutions in terms of the determinants of the AB system are derived. These solutions, which are a combination of rational and exponential functions, can be used to model the nonlinear superposition of the Akhmediev breathers (or the Kuznetsov-Ma breathers) and the rogue waves. The k -order rogue wave of the AB system is produced by the interaction between the l-order rogue wave with $\frac{1}{2}(k-l)(k+l+1)$ neighboring elements in the $(k-l)$ -order breathers $(0

The Enlightenment of Long Term Care Service in Developed Countries to China: Take Germany and Singapore as an Example

Abstract: With the countries all over the world have gradually entered the era of aging, due to the development of medical technology, there are a growing number of elderly people, this large group is object that needs our attention. The care service for the elderly, especially the aged, has been a difficult problem for our country. Early entered into the aging society in western developed countries , they have accumulated more experience in coping with the problem of aging, the same is also true for the construction of long-term care service system for the elderly. In this paper, we chose the Germany and Singapore two developed countries as an example, through analysis and compared with their advantages and disadvantages in elderly long-term care practice, we sum up some experience, which is in to a reference to the development of undertakings for the aged in China.

The Impact of Non-standard Employment on Women's Employment and Countermeasures

Abstract: Non-standard employment has been increasing globally over the past several decades. Women have a tendency to choose non-standard employment. This paper studies the development of non-standard employment and points out that non-standard employment has both positive and negative effect on women’s employment .Based on which, this paper gives some policy advices, such as developing non-standard jobs to provide more employment opportunities for women, eliminating of gender discrimination in employment to achieve fair competition in the labor market, and raising the level of women human capital investment to improve their own quality.

Regional financial development and foreign direct investment

Abstract: In this paper, we examine the link between regional financial development and foreign direct investment using a large micro-level dataset of Chinese manufacturing enterprises. We first investigate the effect of regional financial development on foreign direct investment location choices, and find such development to significantly promote foreign direct investment. We then show that regional financial development also plays an important role in foreign direct investment productivity spillovers. Domestic firms located in financially developed regions gain positive knowledge spillovers from foreign direct investment, but the competitive pressure from multinationals exerts a negative influence on the productivity of domestic firms.

Research on Agri-Food Cold Chain Logistics Management System: Connotation, Structure and Operational Mechanism

Abstract: Along with the demand of development, this paper will define agri-food cold chain logistics management system. It is a general term of management system, organization system, standard system, running mechanism, etc. According to the activities and characters of agri-food cold chain logistics, the content of agri-food cold chain logistics management system includes three levels of management activities. There are macro management and part of the industry management of the government-led agricultural cold chain logistics activity, industry management of industry association as the main body, and micro enterprise operation management of enterprise as the main body. In addition, this paper will draw lessons from the city of agricultural products cold chain logistics management experience in the international, the main behavior of the logistics market, strengthen monitoring and early warning, strengthen the whole process, and make market access strictly and other key links have to be closely surrounded. Through improving agricultural products cold chain logistics management laws and regulations system, standard system, management system, testing system, certification system, technology supporting system, information service system, and establishing emergency mechanism and other agricultural products cold chain logistics security support system, government, industry, consumers, media, education and scientific research institutions and other relevant parties can take many aspects, many angles, many levels mutually supporting measures, in order to establish and improve the agricultural products cold chain logistics safety control system, and establish the whole process control system from farm to table, to ensure the safety of agricultural products cold chain logistics.

Research of AGV positioning based on the two-dimensional Code Recognition Method

Abstract: The automatic logistics and warehousing handling robot AGV is equipped with non-contact control guide, and use a kind of storage battery as a power source. The computer-controlled automatic guiding AGV is developed on the basis of comprehensive analysis of advantages and disadvantages of various modes of guidance, combining absolute and relative positioning application, ultimately I choose the fusion positioning way of Visual navigation and inertial navigation systems. The visual navigation technology used in this article determine the current AGV car's real time location information through the camera on the AGV robot scan the two-dimensional code, then correct this information directly on the inertial navigation system, and readjust the initial parameters for inertial navigation system in order to effectively guarantee AGV positioning accuracy of robot < ± 20 mm. This article includes theoretical analysis of the feasibility of this approach and specific experimental verification of its reliability, finally through the experimental results shows the positioning methods used to regulate AGV robot localization can control its positioning accuracy within ± 20 mm.

Nutrient Release Characteristics of Coated Fertilizers by Superfine Phosphate Rock Powder and its Effects on Physiological Traits of Chinese Cabbage

Abstract: Four kinds of slow release fertilizers were prepared out by coating common compound fertilizer [nitrogen (N)-phosphorus pentoxide (P2O5)-potassum oxide (K2O):15-15-15] with four kinds of superfine phosphate rock powder (SPRP) which accounting for 60% of the total coated materials in mass. Electronic microscope scanning, static water releasing test, soil incubation experiment, and a field experiment were conducted on their nutrient release mechanisms and their effects on physiologic traits of Chinese cabbage. The results showed that all these four kinds of SPRP could markedly improve microstructure and thus release rate. However, their capacity was inferior to controlled release fertilizer (CRF). The four homemade fertilizers increased chlorophyll content, photosynthetic rate, and transpiration rate in the leaves of Chinese cabbage during its late growth stage, and improve the superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) enzyme activities during its ball period. In addition, the four ho...

Design of fruits warehousing monitoring and control system based on WiFi

Abstract: The warehousing time and quality of the fruits are greatly influenced by the warehousing environment factors. Therefore, it has crucial significance for the fruit warehousing environment to carry out multi-parameter monitoring and analyze the parameters collected and then make the regulation and control. Currently this paper presents the environmental factors effected on the fruits warehousing quality and traditional means of protection and proposes a multi-parameter monitoring system based on WiFi. In addition, it designs the hardware structure of the system monitoring node, describing in detail the function of various interfaces and sensors and analyzing the fruits warehousing monitoring system structure based on WiFi, working process and software design. This paper provides a more practical solution for fruits warehousing monitoring and control.

Application of cloud computing in the emergency scheduling architecture of the Internet of Things

Abstract: Resource scheduling is a main research direction of cloud computing technology. In the emergency material dispatch, the unexpected event has the characteristics of high uncertainty and strong destructive. Therefore, the demands for accuracy and timeliness of data analysis are very high, and only through the efficient and accurate implementation of emergency dispatch, we can get the possible realization of the maximum time benefit and minimization cost. By introducing cloud computing technology, we can make a full call to the storage resource pool and computing resource pool in the cloud computing architecture, and provide high reliability for emergency scheduling cloud storage service and efficient cloud computing services to users, thus assist emergency plan formulation, improve the efficiency of emergency material dispatch, achieve real-time emergency dispatch purposes. In this paper, we study on the architecture of cloud computing technology as the starting point, research on the application of cloud computing in the field of emergency material dispatch in the Internet of things.

Research on the task assignment problem of warehouse robots in the smart warehouse

Abstract: The task assignment problem of warehouse robots in the smart warehouse (TAWRSW) based on cargo-to-person is investigated. Firstly, the sites of warehouse robots and the order picking tasks are given, and the task assignment problem for picking one order is formulated into a mathematical model to minimize the total operation cost. Then a heuristic algorithm is designed to solve the task assignment problem for picking multiple orders. Finally, simulations are done by using the orders data of online bookstore A. The feasibility and validity of the model and algorithm are verified. The model and algorithm in this paper provide a theoretical basis to solve the TAWRSW.

Nonautonomous characteristics of the breathers and rogue waves for a amplifier nonlinear Schrödinger Maxwell-Bloch system

Abstract: Under investigation in this paper is a amplifier nonlinear Schrodinger Maxwell-Bloch (NLS-MB) system which describes the propagation of optical pulses in an inhomogeneous erbium doped fiber. Nonautonomous breather and rogue wave (RW) solutions of the amplifier NLS-MB system are constructed via the modified Darboux transformation with the inhomogeneous parameters. By suitably choosing the dispersion coefficient function, several types of inhomogeneous nonlinear waves are obtained in: (1) periodically fluctuating dispersion profile; (2) exponentially increasing (or decreasing) dispersion profile; and (3) linearly decreasing (increasing) dispersion profile. The nonautonomous characteristics of the breathers and RWs are graphically investigated, including the breather accelerating and decelerating motions, boomerang breather, breather compression, breather evolution, periodic RW, boomerang RW and stationary RW. Such novel patterns as the periodic breathers and rogue-wave fission of the amplifier NLS-MB system are exhibited by properly adjusting the group velocity dispersion function and interaction parameter between silica and doped atoms.

An Area-Based Method for Missing Trajectory Completion: A STZ Algorithm

Abstract: As GPS datasets are becoming more available with spatial and temporal information, the needs of high quality, predictive information about spatio-temporal are turning out to be a feasible goal. However, many GPS devices are prone to failure, which results in missing GPS data. Moreover, the missing data may affect the accuracy of the result. To make the matter complicate, the missing data is always not missing at random, and is characterized by long time during which no data is observed. In this paper, there exists a missing trajectory in a truck's traces which lasts a few of seconds. In order to make the trajectory complete, an STZ algorithm is proposed to solve this problem for the first time. The STZ algorithm is aimed to compute the area between any two trajectories. In this paper, we have known many possible routes which are from the original point to the destination. Next, this approach calculates the area between any two trajectories which represents the similarity of the two routes. Last, the K-modes algorithm is adopted to group the similarity of the routes and complete the missing trajectories.

MAD: A Monitor System for Big Data Applications

Abstract: A big data application usually needs to build a pipeline on the top of workflow engine which connects relevant periodic workflow jobs. It's crucial to timely alert pipeline issues, provide an issue diagnosis subsystem to find out root cause from a variety of sources, and measure pipeline/service by predefined metrics. In this paper, we identify three indispensable qualities monitor systems must fulfill namely timeliness, accuracy and flexibility. We find that the conventional monitoring tools lack at least one of three qualities, and introduce a general purpose MAD Monitoring, Alerting and Diagnosis system for big data applications to keep data freshness, collect measurement metrics to meet SLA.

Natural disaster forecast on the base of townships collaborative emergency

Abstract: Purpose – The purpose of this paper is to upgrade the collaborative emergency ability of government in the tier of towns, realizing emergency resource share, emergency cost reduction and emergency efficiency improving. This paper mainly aims to solve the problem of forecasting the natural disaster happening year of every township collaborative region in Fangshan District. Design/methodology/approach – First, classify the townships into five collaborative regions through grey clustering. Second, set up a grey disaster forecast model for the whole Fangshan District according the annals of disaster from 1985 to 2012, and forecast the disaster grade. Third, build a grey disaster forecast model for the collaborative regions after constructing the buffer operators of catastrophic sequence according the annals of disaster from 1949 to 2012. Findings – The authors forecasted the happening year and flood grade of future disaster for the whole Fangshan District. The accurate degrees of both flood and drought year m...

Present Situation, Problems and Countermeasures of E-commerce in Rural Areas

Abstract: In recent years, the development speed of e-commerce is rapid, and the e-commerce inrural areas has become the focus of the government, enterprises and social concern. In this paper, wedescribed the present situation of e-commerce from the aspects of infrastructure, market capacity, marketmain body, policy support and so on. We estimated that rural e-commerce sales in 2017 would exceed 2 000 billion Yuan, in 2020 might reach 5 000 billion Yuan, then the e-commerce amount would be accounted forabout 10% of the retail in rural areas. E-commerce infrastructure in rural areas had a certain foundation; thequality still needed to be improved. All kinds of market subjects had to enter the rural market, which wasmore important to integrate and improve the development. The rural electronic commerce policy wasintensive, but it needed to establish specific policies. The rural electronic commerce solved the dockingproblem of atomic operation in rural areas and the modern market system, also faced problems in knowledgeconstraints, logistics and distribution, market order etc. Therefore, the government needed to strengthen therural infrastructure construction, strengthen the standardization construction and supervision, appropriate toguide the new rural new retail formats and consumption hot spots, to ensure the basic needs of peasantsservices residents, in order to ensure continuous improvement in people's livelihood. Finally, we should putforward the policy suggestions.

Research on environmental recording system for distribution unit in cold chain logistics

Abstract: The environment demands of distribution unit is differ from each other, the goods in distribution of cold chain logistics is of multi-variety and small number and sometimes need to be loaded twice in the transfer station, so the distribution behavior can't be managed unified with transportation monitoring system which is often used for the whole refrigerator car. In this paper, according to the characteristics of distribution link in cold chain logistics, the author designs the environmental recording system applied to distribution unit of cold chain logistics, this system provides a solution of improving customer satisfaction and enhancing the level of services in cold chain logistics distribution.

Research on the Market Access of Cold Chain Logistics Service Quality Safety for Agricultural Products

Abstract: The cold chain logistics service quality safety of agricultural means that cold chain logistics services must meet requirements relating to human health, safety and quality. It needs to be regulated by law, compulsory supervision and security, which mainly refers to the quality of service safety. From the connotation of the cold-chain logistics service quality safety of agricultural products market access analysis, this article cards the agricultural cold chain logistics service quality safety market access system components and puts forward the system frame of quality safety of agricultural products cold chain logistics service market access policy.

The literature review of research on modeling of automated guided vehicle’s picking route

Abstract: Current researches on the picking route modeling of logistics handling AGV are reviewed, and an overview of the main problems existing in the current study are made, then the final conclusion is presented: "goods to person" AGV route picking modeling is our targeted research, combined with qualitative simulation study on logistics handling AGV route picking qualitative modeling, the research for the development of complex systems modeling like AGV system has some theoretical significance and practical value.

Analysis and research of logistics requirements of the textile industry in some place based on KANO model

Abstract: In order to quantify logistics requirements information of somewhere textile industry more effectively, provide reference data for the logistics development and upgrade the logistics services necessarily for textile industry in the region. Based on KANO model, the paper has studied the logistics services for textile industry and quantified requirements information. The paper has considered characteristical logistics requirements of textile industry in the region and tried to objectively treat subjective logistics requirements. So that the research requirements would be close to the real requirements in the area of logistics services.

The Research on the Electronic Commerce Service Quality Indicators in C2C Field

Abstract: The development of network promotes the development of electronic commerce rapidly. In e-commerce modes, the C2C pattern with its advantages of low cost and high response speed characteristics became a significant part in the e-commerce market. In this paper, I will discuss the seller’s service quality indicators through a questionnaire and achievements of experts and scholars. And I want to solve the sellers’ question that what should they do to improve their service quality from five different indicator, such as usefulness, convenience, delivery professionalism, reliability and web designing rationality. On the end of the article, I will give some suggestions to the improve service quality for sellers in C2C models. This is a new empirical study, so I think it can bring more both on theory and practice reference.

A Quality Research Analysis of Logistics Distribution Process of Fresh Meat Cold Chain in Beijing

Abstract: Beijing is a typical consumption-oriented city, where the consumption of fresh food bears the characteristics of rich varieties and high quality. Cold chain logistics is the important guarantee for fresh food safety, so developing cold chain logistics makes great sense. At the same time, in the consumption structure of residents’ daily life, the consumption of fresh meat holds a great proportion. Therefore, the team carries on an investigation in several representative slaughtering enterprises in Beijing, and the authors analyzed the resource allocation of meat cold chain logistics in Beijing and the quality of the cold chain distribution process with the quality management method of PDCA cycle, then in doing that the authors find out the main factors affecting the quality of raw meat cold chain logistics distribution process and optimizes the factors.