bluuebunny/crossref_metadata_2025 huggingface dataset:
A Novel Dynamic Intuitionistic Fuzzy MADM Approach
Authors: Zhou Hui , Gu Haojie
Published: August 2019

This paper explores the multiple attribute decision making problems with dynamic intuitionistic fuzzy information. The notion of intuitionistic fuzzy variable is defined, and one new aggregation operator: dynamic dependent intuitionistic fuzzy Einstein weighted average (DDIFEWA) operator is presented. And based on the D-DIFEWA operator, we develop a procedure to solve the dynamic intuitionistic fuzzy multi-attribute decision making (DIF-MADM) problems where all the decision information about attribute values takes the form of intuitionistic fuzzy numbers and is collected at different periods. Finally, a numerical example is presented to show the applicability of the proposed method for the advanced mathematics teaching effectiveness problem and a sensitivity analysis is conducted to demonstrate efficiency of dynamic evaluation.
Study on the Informatization of the Standard of Railway Freight Transportation Service and Its Implementation Path
Authors: Jin Zongzhen , Cao Lili , Zeng Yi , Cheng Yonghong
Published: August 2019

with the development of information technology, the railway freight transportation of China has made a great improvement in management efficiency and customer services. Practice has proved that standardization is an important technological means of improving management effectiveness and optimizing the service quality, with the Standard of Railway Freight Transportation Service Quality promoting railway freight transportation development. In the new era, informatization is becoming the important path to improve the standard, which can regulate the railway freight. Furthermore, Furthermore, some suggestions of informatization implementation path are put forward
Implement of Overhauser magnetometer coordinate transformation software
Authors: Yu Wenhao , Chen Shudong , Zhang Shuang
Published: August 2019

Two kinds of coordinate projections of Overhauser magnetometer coordinate transformation are studied in this paper. On this basis, the MFC program of Visual C++ is programmed independently. The program implements accurate conversion of Gauss-Krüger projection coordinates and UTM projection coordinates to the WGS-84 geodetic coordinates. It is verified by the examples that both forward projection calculation errors are less than 1.0m. The error of Gauss inverse calculation is less than 10-3 degrees, while the error of UTM projection coordinate inverse calculation is less than 10-5 degrees. This research provides assistance for magnetic survey workers to generate coordinate images, and is also the theoretical basis for the corresponding function of magnetometer PC software.
Improved algorithm of DTW in speech recognition
Authors: Zhi-Qiang HU , Jia-Qi ZHEN , Xin WANG , Zi-Wei LIU , Yong LIU
Published: August 2019

This paper improves the Dynamic Time Warping (DTW) algorithm. In order to change the problem of the traditional search range of DTW speech recognition algorithm is too large, an improved DTW algorithm is proposed to limit the search path. Firstly, the traditional algorithm is analyzed to find its speech recognition search path, distortion and recognition efficiency. Secondly, the improved algorithm is introduced, the search path is limited, and simulation is carried out in MATLAB. Compare the improvement results with the improved recognition results before comparing the distortion and recognition efficiency, and the improved efficiency is calculated. Experimental results show that the improved new speech recognition algorithm is superior to the traditional algorithm in overall performance.
Analysis of Centralized Inter-satellite Link Network Coverage Based on STK and Matlab
Authors: Yue Zhang , Yunxin Guo , Jiacai Hong
Published: August 2019

Aiming at solving the problem of network coverage of GNSS system inter-satellite measurement and control link, the method of joint STK and Matlab is adopted. By using the interface provided by both parties, Matlab can directly control STK for task analysis, and obtain professional orbit data and star directly from STK. The distance information is processed and analyzed by Matlab. The preliminary analysis results of the link coverage of the centralized inter-satellite link network route show that the centralized network coverage is high and the on-board antenna resource utilization is high, but the load capacity of the satellite payload and the on-board data processing. The performance of the device puts high demands on it.
Research on forecast method of railway passenger flow demand in pre-sale period
Authors: Wei Zhengzheng , Shan Xinghua
Published: August 2019

The railway demand scientific forecasting is a rapid response mechanism for the railway sector, rational layout train plan for achieving definitive dynamic adjustment, and the basis for carrying out revenue management. In the railway industry, with changes of the seasons, holidays, emergencies and strategic competitor (such as airline routes for a certain period of reduced discount), passenger flow demand changes. Based on actual demand, this paper proposes an adaptive and flexible method of the railway passenger flow forecasting, which can be adapted to the above factors.
RFM high-speed railway customer value classification model based on spark
Authors: Wei Zhengzheng , Shan Xinghua
Published: August 2019

As implementing customer relationship management (CRM) is the future development trend of high speed railway, based on the customer value of customer classification research has important theoretical and realistic significance. Based on the huge number of the high speed railway’s customers, this paper proposes a parallel RFM customer value classification model based on the Spark framework. First, based on the RFM customer value model, calculating the coefficient of customer’s value, then based on the Spark framework, designing the parallel genetic k - means algorithm. The experiment proved this model has the quality of computing quickly and high precision. It has the obvious practical significance applied to the customer relationship management system.
3D Visualized RC Structure Durability Analysis
Authors: Liu Wenpeng , Ge Jian , Zhou Jiayuan
Published: August 2019

Building Information Model (BIM) is used to share and exchange information between different applications for considerable processes of Architecture, Engineering and Construction (AEC) projects, and it is the key technology to manage information throughout the entire lifecycle of a building, solve the problem of information silo and improve the productivity of AEC project. This paper proposes a new method to extend the BIM technology, which makes it possible to integrate durability factors into design, durability analysis and residual life of building structures prediction. Based on the combination of the national durability code and achievements of RC durability study, a 3D Visualized RC Structure Durability Analysis is developed, which is verified to be capable of improving lifecycle management of AEC projects, upgrading durability level and optimizing the lifecycle cost structure of building projects by a case study.
Economic Dispatch of Energy Storage System in Micro-grid
Authors: Zhou Meiyu , Zhai Qiaozhu , Zhou Yuzhou
Published: August 2019

Renewable energy and energy storage combined system cannot only realize load transfer, load shifting, energy saving and emission reduction, but also ensure the stability and safety of power grid. Economic dispatch of energy storage system under micro-grid environment is a typical multi-stage stochastic programming problem. The purpose of this paper is to propose an economic dispatch model for the energy storage system satisfying the non-anticipative constraints. The objective function is constructed based on the minimum dispatching cost of the micro-grid, and the accurate mathematical description of the feasible region is given. By solving these problems, we can obtain economic dispatch results of the energy storage system satisfying the non-anticipative constraints. The proposed methods are tested on four different cases, and the results suggest the methods are effective.
The Importance of green roofs and Sustainable development
Authors: Bříza L
Published: August 2019

The sustainable development is the observance to the principles of respect for nature, environmental protection and respensible approach to social and economic standards of urban development. Green roofs are an important and inherent aspect of such development. For current and especially future climate conditions they are also represent a signification factor of water management and are one of the ways to keep cities habitable for future generations as well. Green roofs can efficiently retain water and gradually release it back into the environmental in a place where was a driving rain without water affected site literally just flowed. The desired side effect of the process may be overall cooling of the environmental. Simultaneously, the vegetation constructions contribute to the elimination of the so-called heat island effect, and thus contribute to the natural change of water.
Determination of input parameters necessary for the design of the polder in the Horná Topl’a basin, Slovakia
Authors: Fijko R
Published: August 2019

In the last decade, there have been many destructive floods in various parts of Slovakia. Despite the extensive investment in flood control works, there are only small changes and neither flood occurrences nor damages are decreasing. A possible consequence of climate change is an increased frequency of extreme meteorological events that may cause floods. The determination of the occurrence of these extreme hydrological phenomena in a particular catchment is directly subject to the input data in dependence on climatic and geomorphological processes. This article deals with the method of comparing the retention capacity of the polder by means of geographic information systems (GIS) compared to the results from map data and design of flood wave diagram for the river of Banský Stream. This proposal is part of the flood protection of the area of Čergov Mountain in eastern Slovakia where is designed the system of polders.
Experimental house and stratification preheating tank
Authors: Kosican J
Published: August 2019

The aim of this study is to simulate two types of usage of solar panel systems and their share of heating and hot water in the experimental house. Two differently designed solar systems are tested in an experimental house with stratification and the other without stratification. Both systems provide annual demand for heat and demand for hot water. The simulation program is T * SOL 2018. By using a variant comparison program, it allows you to examine which type is better in different standards and also compare both solar panel outputs. The results can be analysed in different environments, such as different weather conditions or different heat losses of a building. The following research deals only with heating and water heating[2][2][2][2][1].
The forced ventilation analysis of panel block building pilot project
Authors: Miček D
Published: August 2019

The 21th century is characterized as a hectic age, which point out the inability of people to correctly understand and evaluate the physical parameter of the internal environment and microclimate. This misunderstanding often leads to the life endangerment in the way of carbon dioxide high levels and inappropriate living temperature. Latest technological development helps us to improve this situation by computational capabilities, which includes the possibility of measurement and collection data from long-term point of view. The contribution consists of long-term real-time measurement at panel block building pilot project in Brno, Czech Republic. The measurements are analysed and evaluated with respect to interior environment and microclimate requirements stated in Czech National Standards. The result comprise the proposals and simulations of internal microclimate, focusing on the carbon dioxide levels suggesting the most efficient forced ventilation unit operation, based on evaluation of measurement and simulations. The main asset is opportunity to regulate and optimize the forced ventilation units based on the simulation of the carbon dioxide level in the room, resulting in financial savings by proper regulation of the forced ventilation units and improving the microclimate of buildings.
Assessment of shear capacity of concrete bridge deck slabs using theoretical formulations and FEM analysis
Authors: Vidaković A , Halvonik J
Published: August 2019

Reinforced concrete (RC) slabs without shear reinforcement are typical cases of bridge deck slabs. For such structures, shear has been a challenging problem in the assessment based on the current standards. This paper deals with the comparison of the methods for assessment of bridge deck slabs subjected to a concentrated load. Two experimental campaigns were selected as case studies and analysed by the simplified theoretical formulations and linear finite element analysis (LFEA). The differences between analysis methods were discussed regarding one-way shear behaviour of the bridge deck slabs.
Experimental research of arc heater with three electrodes
Authors: Yu Lei , Feng Yao , MouSen Cheng
Published: August 2019

As a heat source capable of producing extremely high temperature, the arc heater developed with the development of ballistic missiles and other spacecraft. With the development of hypersonic vehicles, the requirement of thermal protection performance test on ground simulation equipment is higher and higher, the current and power of arc heater are increasing. The traditional single-electrode arc heater can’t run stably for a long time under large current. In order to improve the operation stability of the arc heater under large current, a multi-electrode technique was developed. In this paper, the effects of parameters such as arc current, gas flow rate and resistance on the current distribution of each sub-electrode of the three-electrode arc heater are studied. The results show that when the arc current is constant, increasing the resistance difference of each sub-electrode is beneficial to the average distribution of current. With the increasing of arc current, the current distribution of each sub-electrode is more uniform. The setting of parameters such as arc current, gas flow rate and resistance has great influence on the distribution of cathode current of multi-electrode arc heater, but little influence on the anode.
Photoluminescence from disc-shaped Si3N4/WS2/Al2O3 heterojunction
Authors: Zhou Guyu , Shen Fang
Published: August 2019

Transition metal dichalcogenides (TMDCs) have a direct band gap and exhibit more peculiar properties than graphene. Two-dimensional TMDCs (2D TMDCs) are widely used in many fields such as catalysis, energy storage, and composite materials due to their unique sandwich structure. Compared to the three-dimensional structure of silicon materials, TMDCs have a two-dimensional layered structure at the nanometer scale, which can be used to manufacture semiconductors or smaller, more energy-efficient electronic chips, which will be widely used in the next generation of nanoelectronic devices. In this paper, continuous light and femtosecond laser are used to irradiate disc-shaped Si3N4/WS2/Al2O3 heterojunction, and the photoluminescence characteristics of the heterojunction are studied by changing the distance between the sample and the light source to change the incident power.
Performance Assessment for Sunlight Radiation Resistant Coating Manufacturers
Authors: Yang Chun-Ming , Gong Huifeng , Hsu Chang-Hsien , Chen Chi-Yuan
Published: August 2019

It is of great significance to select suitable manufacturers to improve the ability to respond to the final customer demand. Establishing a strategic partnership with manufacturers is an effective way to increase profits and improve the process efficiency for better connectivity across the supply chain. Therefore, manufacturer performance evaluation and selection is one of the most important decision-making problems in enterprises. This study proposes a manufacturer capability index MCI
and gives the uniformly minimum-variance unbiased estimator (UMVUE) of the variance and probability density function (PDF) for index MCI
. Finally, an example of performance assessment for sunlight radiation resistant coating (SRRC) manufacturer is given to illustrate the application of the proposed index MCI
.
Software Design of the Detection Device for the Performance of the Faucet based on LabWindows/CVI
Authors: Xia Meixia , Tang Minjun , Feng Panpan , Cheng Yunbin
Published: August 2019

Flow and sensitivity are two important indicators for measuring faucet performance. This paper designs a PC software based on the LabWindows/CVI development platform for the faucet flow and sensitivity detection system. The main function of the software is to communicate with the lower computer, control related hardware, and achieve data acquisition and analysis during the test process. Finally, the integration and record of test data is realized through MySQL database. The software runs stably and provides good human-computer interaction and automation services.
Preparation of Ti(C, N)-based Cermets Powders with Double-core Ring Structure
Authors: Yan Hui , Deng Ying , Jiang Shan , Chen Qiaowang , Cao Shixiu , Liu Bing
Published: August 2019

In this study, the microstructure of Ti(C, N)-based cermet was improved by adding β-cobalt (face-centered cubic) and (Ti, W, Mo, Ta)(C, N) solid solution powder to prepare micro-nano Ti(C, N)-based cermet powder. In order to improve the comprehensive properties of the material. Firstly, the Co powder with face-centered cubic structure was obtained by the solid-phase reaction of high-energy ball milling, and its plastic deformation resistance was higher than that of Co powder with dense hexagonal structure. Secondly, The powder of (Ti, W, Mo, Ta)(C, N)solid solution was obtained by mechanical alloying and high-temperature carbonization under the atmosphere of N2. And the two were applied to the micro-nano Ti(C, N)-based cermet powder, and finally the properties of cermet powder were compared with that of ordinary cermet powder. The results show that the microstructure of micro-Ti(C, N)-based cermet powder prepared in this study is a double-core rim structure, that is, the structure of black core white rim and gray core white rim. This structure can effectively prevent crack of the expansion. The strength and toughness of cermet materials are greatly improved, which is beneficial to the improvement of comprehensive properties of cermet materials.
Research on Energy Saving Measures of Residential District Lighting System
Authors: Chen Junsong
Published: August 2019

In today’s world, energy issues are a key issue related to national security and sovereignty issues. All walks of life are making suggestions and actively practicing energy conservation. As a major energy construction industry, designing an energy-saving lighting system in the construction of residential communities is very meaningful for energy conservation. This paper believes that when designing residential district lighting energy-saving systems, there are many types of lamps to be considered, such as the lack of natural light, safety issues and different time requirements for lighting in some areas. The countermeasures adopted are clear. In this case, the lighting requirements and the different lighting areas are designed, and intelligent switches and LED lights are installed. Through the energy-saving design of the lighting system, the effect of optimizing the lighting control and effectively utilizing the natural light is achieved in effect. This system not only has an effect on the lighting skills of residential areas, but also has reference significance for the design and optimization of lighting systems that are common in life.
Thermal performances and characterization of microencapsulated phase change materials for thermal energy storage
Authors: Ma Yanhong , Xie Qifei , Li Yue , Min Xianhao , Wang Xinzhong
Published: August 2019

A series of microencapsulated phase change materials (micro-PCMs) contained butyl stearate and octadecane as core materials were synthesized by suspension-like polymerization method. Methyl methacrylate (MMA), divinylbenzene (DVB), pentaerythritol triacrylate (PETA) and pentaerythritol tetraacrylate (PETTA) were introduced in polymerization system to form shells. DSC results indicated that microencapsulation ratio could reach as high as 75 wt.%. After 500 times thermal cycling test, the microencapsulation ratio of these as-prepared micro-PCMs decreased only by 2.3 wt.%. SEM images showed that these micro-PCMs have relatively spherical morphology and compact surfaces with diameter ranging from 5 to 40 μm.
Structural Design and CNC Machining of Integral Impeller for Automotive Turbocharger
Authors: Guo Jingjie , Ma Shaojie , Zhang Xiangjin , Shi Yaoyu , Wang Zhenning
Published: August 2019

Integral impeller is a key component of turbocharger. Although the research on structural design and machining of integral impeller has made some progress, The technical route of design and processing of integral impeller for vehicle turbocharger is cumbersome and slightly less efficient. A novel technology route of structure design and CNC machining for the integral impeller is proposed in this paper. Firstly, according to the relevant design criteria, the relevant parameters such as the overall impeller height, the blade height, the impeller inlet diameter, the impeller outlet diameter and the number of blades are obtained. Then the 3D model is created in the CAXA manufacturing engineer. Using CAXA CAM, the tool paths are generated in order to output CNC machining programs. The CNC machining programs are imported into the five-axis machining center for machining the integral impeller. The technology route can effectively improve the design efficiency, reduce the cost of design and manufacturing, and shorten the design cycle to a certain extent.
Mechanical properties of highly dispersed carbon nanotubes reinforced cement-based materials
Authors: Qin Jie , Qu Jian , Li Yanwen , Wang Bo , Sun Zhipeng , Zhang Hongqiang , Zhang Weidong
Published: August 2019

Carbon nanotubes (CNTs) are considered as ideal candidates for preparation of high performance cement-based composites due to their remarkable mechanical properties. Dispersion of CNTs is the crucial step while using CNTs in cement-based materials, while poor dispersion could lead to performance reduction of materials. In this paper, an effective dispersion method of MWCNTs by applying ultrasonic energy and in combination with surfactants was developed. The effects of surfactant type on the dispersion of MWCNTs were systematically investigated. Additionally, experiments are carried out to investigate the influence of concentration of MWCNTs on the mechanical properties of cement paste. The results show that a stable MWCNTs suspensions could be manufactured via the addition of surfactants and the stability of MWCNTs suspensions appears to be related to the ionic nature of the surfactant. Furthermore, the addition of MWCNTs is justified to enhance the flexural strength and compressive strength of the cement-based materials remarkably.
High-precision femtosecond laser beam shaping in material processing
Authors: Guo Yiming , Wang Yu , Hu Qinglei
Published: August 2019

Laser beam shaping is the process of modulating the amplitude and phase of a laser beam. With the development of the spatial light modulator, laser beam shaping can modulate the light field to arbitrary pattern dynamically via the computer-generated hologram (CGH). Otherwise, femtosecond laser is widely used in material processing owing to its high peak power, low hot effect and nonlinear effects. However, femtosecond laser is not strictly monochromatic, which will introduce dispersion when femtosecond laser diffracted by a spatial light modulator, and deteriorate the effect of beam shaping. Here we present a method of high-precision femtosecond laser beam shaping. Experimental results confirm that the proposed method can be used to shape femtosecond laser beams into arbitrary patterns in the whole field of view (FOV) with the resolution near the optical diffraction limit.
Analysis of Medicinal Composition and Pharmacological Action of Chinese Medicine Honeysuckle
Authors: zhang Yingzhi
Published: August 2019

Objective: To analyze and study the medicinal components and pharmacological effects of traditional Chinese medicine honeysuckle, and to provide important clinical value for future clinical treatment. Methods: Actively review relevant literature reports and medical works related to honeysuckle, and carry out scientific statistics and summary on its medicinal components and clinical pharmacological effects. Results: The main medicinal ingredients were volatile oil, triterpenoid soap and organic acid and acid compounds; it has many pharmacological effects, such as antibacterial, anti-inflammatory, liver-protecting, anti-viral, hemostasis and so on. Conclusion: The traditional Chinese medicine honeysuckle has a very high medicinal value in clinical practice, and can be actively promoted and used in the clinical treatment of Chinese and Western medicine.
Recognition of milk somatic cells based on dichotomy model
Authors: Chen Lei , Gao Xiaojing , Xue Heru
Published: August 2019

The number of various milk somatic cells can be calculated accurately by using image processing technology. In order to identify four kinds of cells,a method of milk somatic cell recognition based on dichotomy model was proposed. Firstly, eight typical morphological features were extracted from cells. Some morphological features were selected by feature optimization and Bayes classifier was used twice to carry out two binary classification. The texture feature described by HOG and BP neural network were uesd on the last classify. Finally, 96.02% of the average classification accuracy was achieved in the actual experiment of milk somatic cell image data.
Differential expression of anthocyanin biosynthetic genes in relation to anthocyanin accumulation in the pericarp of mango (Mangifera indica Linn.)
Authors: Wang Songbiao , Wu Hongxia , Xu Wentian , Ma Xiaowei , Li Li , Zhan Rulin
Published: August 2019

We evaluated 14 mango cultivars with different pericarp color for pigments, chromatic parameters and mRNA level of anthocyanin synthesis gene. Pericarp of anthocyanin concentration varied from none to 15.96/100g FW among the 14 cultivars, which were divided into three coloration types, i.e. non-red (Deshehari, white ivovy, Guire No.82, Guixiang, Lingshui, Qingpi and Yuexi No.1), medium type (Tainong No.1 and Chinhuang) and red (Renong No.2, Renong No.1, hongwacheng, Zillate, R2E2). From the results of expression of structure gene correlated with anthocyanin synthesis, the expression of the five genes, especially MiC4H, Mi4CL2, MiANS, MiDFR and MiUFGT2 in red cultivars were significantly higher than that of non-red cultivars.
Research on Discharge Characteristic of Free Metal Particles in DC Bushing
Authors: Li Song , Deng Jiang
Published: August 2019

Free metal particle was a common impurity in fault DC bushing, which was produced while its operation. This paper mainly focused on analyzing the typical fault of DC bushing, morphology and motion characteristic of mental particles. A experiment platform was built to study the discharge characteristic, and the result consistently with analysis was obtained. The mental particles would aggregate and accumulate due to the unevenly temperature distribution, and lead to distortion of electric field. The location and width of mental particles would have impact on discharge characteristic. The research result could be used as structural optimization and design of DC bushings, which was worth a further study both in academic and engineering application.
Topology optimization of Workbench gearbox Box reinforced bar based on ANSYS
Authors: Lei Lei , Yunan Sui , Tianmin Guan
Published: August 2019

In order to improve the structural performance of gearbox and improve the service life of gearbox, a method based on topology optimization to improve the layout of reinforcement is proposed in this paper. In this paper, a three-dimensional model of gearbox is established in CREO3.0, and the simulation analysis is carried out by using ANSYS Workbench software to optimize the layout of stiffeners and obtain the best scheme.The results before and after optimization are compared and analyzed, and it can be seen that there is a reduction in stress concentration after optimization.
3D visualization of urban underground pipelines by using SuperMap
Authors: Wen Feng Kai , Wen Lan Gui , Juan Yue Xiao , Yang Pang Li , Yu Tao Yan
Published: August 2019

For the complicated structure and spatial relationship of urban underground pipelines, it’s necessary to employ 3D visualization technology in pipeline management and maintenance. It’s not efficient to use 3D modelling software such as 3DS MAX in building a large range scene, and it’s difficult and cumbersome to develop the functionalities for 3D visualization of urban underground pipelines from scratch by using the programming APIs such as OpenGL and DirectX3D. In this paper, based on the 3D visualization controls and interfaces by SuperMap, an adaptive method is proposed for building 3D models of urban underground pipeline network. At first, the detailed models of the pipe points and pipe segments are designed by 3DS MAX and imported as map symbols into a SuperMap Symbol library. Then the whole pipeline network is loaded and transformed into a 3D scene by using SuperMap interfaces. Moreover, the 3D models of the ground objects such as buildings are cached in OSGB format, and rendered with underground pipelines to support interactive queries and some professional analysis.
Research on Highway Slope Stability Based on Hierarchical Fuzzy Comprehensive Evaluation Method
Authors: Zhou Xiaorong , Xu Tianxing , Shi Qianghua , Zheng Kai , Sheng Jiaxing
Published: August 2019

The highway slope stability monitoring based on the Internet of Things technology can effectively realize the accurate and real-time three-dimensional monitoring of highway slopes and reduce the loss caused by road slope disasters. From the perspective of the system, based on the geological structure, topography and hydrology of highway slopes in Guangxi, this study uses the analytic hierarchy process to establish the stability of highway slopes based on the analysis of the characteristics of highway slopes, survey data, and factors affecting stability. This paper analyzes the structural model of the influencing factor layer, calculates the weights of the influencing factors of the road slope stability, combines the fuzzy relationships between the factors, and uses the comprehensive evaluation principle in fuzzy mathematics to realize the evaluation of slope stability. The results of an example analysis show that the evaluation method is reliable and effective.
Research on Dynamic Causes of The Evolution of Warship Equipment’s Maintenance and Support System
Authors: Zhang Shuowei , Hutao  , Yang Chunhui
Published: August 2019

This paper analyzes the process of China’s Warship Equipment Maintenance and Support System’s development, which considers the evolution of the system as the results of the combined effects of internal and external factors. A basic conceptual model of dynamic causes of the evolution of Warship Equipment’s Maintenance and Support System has been built based on the theory of Dynamic core competence. It has answered the question “why the Warship Equipment’s Maintenance and Support System evolves.
Risk Assessment of Equipment Repair Cost Based on Multi-Agent Modeling
Authors: Xiao Xiong , Dong Peng
Published: August 2019

Due to the complicated structure, large equipment is prone to cost risks during the repair process. To assess the cost risk of such equipment, the method of step-by-step decomposition of the repair equipment can be adopted. The repair task is first decomposed into the bottom-level work unit at the system level or equipment level, and the risk factors are identified by the WBS-RBS method, and the risk is calculated by the FAHP method. The factors are combined with the probability values, and the comprehensive probability values of these risk factors are input into the cost risk assessment model based on Anylogic software. In the equipment repair task of a diesel engine, the model realizes the cost risk assessment of the underlying work unit through single agent, and builds the multi-agent to summarize the evaluation results to obtain the repair task cost risk assessment value.
SA-DPSO-based Weapon-target Assignment for Cooperative Air Defense with Anti-aircraft Gun-Missile Weapons
Authors: Wang Yue , Zhou De-yun , Yao Tong , Bai Hao
Published: August 2019

For the weapon-target assignment problem of anti-aircraft gun-missile weapon formation air defense, a weapon-target assignment model was developed for anti-aircraft gun-missile weapon formation according to the different fire characteristics of anti-aircraft missile and anti-aircraft gun system. The model gave sufficient consideration to the damage zone of anti-aircraft gun and missile as well as the weapon-target join point, and the assignment result allows anti-aircraft gun-missile weapons to fire missiles and anti-aircraft guns at the right moment. On this basis, the method of Simulated Annealing-Discrete Particle Swarm Optimization (SA-DPSO) was proposed to solve the weapon-target assignment for formation anti-aircraft. The simulation result showed good rate of convergence and global searching ability of the algorithm.
Screening of Abnormal Values Based on Centrifugal Rate
Authors: Zhang Xiaoli
Published: August 2019

In this paper, an outlier screening method based on centrifugal rate is proposed to screen outliers in data, which is to use the size of centrifugal rate to determine whether the data is significantly larger or smaller than other normal values of centrifugal rate. Taking the mean of data as the center, the distance between any point and the mean as the long half axis of the ellipse, and the distance between the normal dimension as the center, the model is established. The eccentricity based on the mean can be obtained, and so on, the eccentricity of all data based on the mean can be obtained. Finally, the centrifugal rate which deviates from the average centrifugal rate obviously surpasses other data is listed as the abnormal value, and the abnormal value is eliminated.
Design of Control System for Submarine Receiving and Playing Based on Fuzzy Control
Authors: Zhang Haiyan
Published: August 2019

In the process of retrieving and releasing deep-sea submersible, it is required that the retrieving winch should have constant tension control function to reduce the impact of wave fluctuation on the submersible. In this paper, a constant tension winch control system based on fuzzy control is established, and the system is simulated and analyzed. The simulation results show that the system can meet the actual operating conditions, and has good dynamic and steady-state performance.
Four-Wheel-Independent-Driving Electric Vehicles Stability Control Based on Yaw Rate and Side Slip Angle
Authors: Hou Xinghai , Yin Dejun
Published: August 2019

In this paper, a nonlinear system state observer and a vehicle upper controller suitable for a four-wheel independent drive vehicle have been proposed. The observer uses Unscented Kalman Filter to observe the longitudinal speed, lateral velocity and yaw rate of the vehicle, and then calculates the side slip angle of the vehicle. The upper controller adopts the control method of yaw rate and side slip angle combined with Sliding Mode Control to calculate the target yaw moment. Finally, the CARSIM-MATLAB co-simulation is carried out to verify the proposed control strategy. The simulation results indicate that the proposed control strategy enables the vehicle to effectively track the target yaw rate and side slip angle simultaneously, ensuring vehicle stability and safety.
The united research of ER, EPR, String theory and Force
Authors: Zhang TianCheng
Published: August 2019

More than 100 years ago, there have been many theories about physics. However, there are still many argumentative theories about physics that need to move forward. For example, relativity and quantum mechanics are important branches. There is also a lot of controversy about relativity and quantum mechanics. Quantum entanglement is one of them. This article focuses on the relationship between ER, EPR and String theory.
Research on the Optimization Design of Metallic Gasket Based on DOE Methodology
Authors: Du Peng , Lu Jian , Tuo Jianzhi , Wang Xinning
Published: August 2019

In the present study, the method of simulation and Statistical Design of Experiment (DoE) combined approach has been applied to investigating the influence of metallic gasket, flange and bolt on sealing performance. In order to analyze the influence of wavy shape, bolt distribution, wavy height, gasket thickness, top flange thickness, top flange material, gasket materials and bottom flange material, the contribution degree of each factor to the bolt axial force and pressure distribution was taken as the evaluation index. Research results show that the corrugated shape and bolt distribution have the greatest influence on the pressure distribution of gasket and the range of the bolt axial force.
An Improved Third-order CWENO-Z Scheme at critical points
Authors: Tang Shujiang , Li Mingjun , Han Shuang
Published: August 2019

In this paper, by modifying the smoothness factor of the third-order CWENO scheme, we present the two-parameter CWENO-NZ3 scheme to improve accuracy at critical points. We selected some classical examples for numerical simulation, such as one-dimensional Sod shock tube, Shock-entropy wave interaction, Riemann problem with strong discontinuity and Rayleigh-Taylor instability problem. Numerically comparing with the classical third-order CWENO schemes, it is found that the improved schemes not only improve accuracy and resolution at the extreme points, but also reduce dissipation.
Applications Research of Wireless Video Transmission Technology in Security Monitoring
Authors: Ye Tianyi
Published: August 2019

With the development of monitoring industry from full analog monitoring to full digital monitoring system, monitoring transmission technology has also experienced from closed-circuit television transmission to lP wired network transmission. The security monitoring system based on wireless video is intuitive in form and rich in content. Wireless video intelligent monitoring and control part and display and recording part are applied in many places of society. Through the control operation of the camera host, the image captured by the camera is collected and sorted, and the image is input, stored and replayed through specific processing mode. Moreover, video intelligent analysis technology can greatly improve the efficiency of security monitoring and realize the unattended automatic security monitoring system. Gradually moving towards digital network development, the efficiency has been greatly improved and the security has been greatly enhanced. As an indispensable part of digital security system, wireless video transmission technology has become a powerful tool for modern management.
A design method for absorption of low-frequency noise using acoustic metamaterials
Authors: Xu Xi’an , Wang Xiaoming , Mei Yulin
Published: August 2019

This paper investigates the design method for absorbing and isolating low-frequency noise by utilizing the acoustic metamaterials, which consist of mass and membrane vibrators embedded into acoustic materials. Firstly, the unit cell model of the metamaterials is established to analyze characteristics of band-gaps, which is verified further by frequency domain response analysis. And then, the influence of geometric and material parameters of unit cells on the band-gap properties is investigated. Finally, the wave propagation in the metamaterials with finite periodic structures is simulated for the studies of the low-frequency noise isolation, and the effect of different group patterns of unit cells on the isolation of low-frequency noise is discussed. The results show that the greater the density difference between the mass and the base material is, the greater the number of band-gaps and each bandwidth become. And also, as the thickness of membrane increases, the number of band-gaps increases but the band-gaps are narrow and scattered. The finite periodic structures composed of uniform unit cells can hardly widen the low-frequency bandwidth by adjusting the parameters of the components. However, the non-uniform finite periodic structures composed of different unit cells can widen the band-gaps of the whole structure by adjusting parameters of different components.
Design of an autonomous seafloor observation prototype system for deep seafloor observation
Authors: Wang Huacan , Xin Yongzhi , Yang Wencai
Published: August 2019

The deep seafloor is closest to the Earth’s interior and the physical, chemical and biological processes of the seafloor interact complexly. Therefore, the observations of the deep seafloor are critical to the study of global climate change and the change laws of ecosystems in complex environments. For the requirements of long-term observation of the deep seafloor and remote real-time data transmission in the South China Sea, an autonomous seafloor observation prototype system is designed, which combines the sea surface buoy and the seafloor junction box with the Electro-Optical-Mechanical cable. At the same time, according to the requirements of marine environmental parameters, dynamic parameters and biodiversity information collection, this paper proposed a distributed data management model based on the CAN bus to improve the data transmission efficiency and ensure the data quality. In this paper, the design of each component of the autonomous seafloor observation system was described in detail, including its hardware, software and communication system. The observation data from the experiment were given. In the sea experiment, the seafloor observation data were transmitted to the shore-based control center in real time through the satellite communication network and stored in a database. 99.4% of the data were successfully received. The results of the sea experiment show that the system can meet the requirements of long-term observation and remote real-time data transmission, and the reliability of the system is verified.
A Movable Roof Greening Device
Authors: Niu Yu
Published: August 2019

With the development of garden technology and the construction of ecological environment, roof greening has become one of the new ways to improve the urban environment, which can increase greening rate, improve living environment and help build sponge cities.The existing roof greening method is to make the vegetation into greening module units and then assemble them into a whole greenbelt on the roof, which is inconvenient to move and easy to be damaged during transportation. In addition, many outlets for discharging rainwater account for the loss of the matrix layer, and it is inconvenient to clean.Therefore, a movable roof greening device is invented, which has the characteristics of easy to operate, sealed, non-slip, stable and so on. It can effectively solve the defects in the existing devices, at the same time, it helps to solve environmental problems such as heat island effect and poor air quality.
Research on Application of LPWAN in State Monitoring of Distribution Network
Authors: Wang Zhiwei , Zhai Mingyue
Published: August 2019

Technology of IoT plays an important role in the application of power information collection and fault warning of distribution network equipment. However, the communication technology used in the previous smart grid IoT demonstration application project generally has short coverage distance, high power consumption of terminals and other defects. In this paper, the requirements of typical state monitoring service in distribution network are analysed. The number of potential monitoring terminals is huge, and the service data have the characteristic of “small data”. Traditional technologies such as wireless private network or Zigbee are not suitable for this communication requirement. LPWAN such as NB-IoT and LoRa is very suitable for transmitting a small amount of information over a long distance, which provides a new support for the communication in distribution network.
Writing process restoration of Chinese calligraphy images based on skeleton extraction
Authors: Zhang Wenting , An Weihua , Huang Dong
Published: August 2019

In this paper, a writing process restoration method for static Chinese calligraphy works is proposed. Through this method, the initial skeleton of the Chinese character calligraphy image is extracted first. Then, the distortion elimination and sorting processes are performed for the initial skeleton, and the accurate skeleton of the Chinese character image is obtained. Finally, the appropriate ink dots are selected to move and render along the skeleton, thus obtaining the dynamic writing effects. Regarding the aspect of skeleton distortion elimination, the initial skeletons are first classified into three different types; then, the processing algorithms are designed respectively according to their morphological features, thus realizing highly efficient recognition and elimination for the skeleton distortion. This method can realize rapid dynamic restoration for calligraphy fonts, such as regular script.
Application of Virtual Reality Technology in Library Visual Information Retrieval
Authors: Hu Jianfei , Zhang Bin , Wang Di
Published: August 2019

Information retrieval is one of the important service contents of libraries. However, Traditional information retrieval methods cannot guarantee the efficient use of book resources and good reader experience. Therefore, this paper mainly discusses how to introduce virtual reality technology into the construction of digital libraries and provide a new service mode for library visual information retrieval. In order to break the traditional way of building information platform in libraries, we propose to construct a library VR information retrieval system, and introduce the architecture, construction process and scene modelling of the system. This system can improve readers’ information retrieval experience from the perception and interaction level, and greatly promote the integration and effective utilization of library information resources.
Data Collection Optimization Method for Wireless Sensor Networks Based on Linear Regression
Authors: Zhang Meng , Zhang Xiaomei , Huang Yinghui
Published: August 2019

In the event monitoring applications of wireless sensor networks, the sensing data collected by sensor nodes near the same monitoring area has a great spatial-temporal correlation. In order to reduce the amount of data transmission in the network and the energy consumption of communication among nodes, an energy-efficient distributed data collection optimization strategy based on linear regression for wireless sensor networks is proposed. linear regression model of local sensing data is constructed to represent and predict the actual sensing data monitoring values of sensor nodes. Within the allowable range of errors, the node does not need to transmit the actual monitoring sensing data to the sink node, but only transmits the parameter information of the regression model basis function. Without losing the basic structural characteristics of data, the communication overhead caused by frequent data transmission between sensor nodes is effectively reduced, and the linear regression model of sensing data adopts the incremental update method with low computational complexity. he simulation results show that the data collection optimization strategy based on linear regression can effectively predict and estimate perceptual data with less network energy consumption, and achieve the goal of reducing network energy consumption.