bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Collaborative Combat of Heterogeneous Multi-UAVs Based on MARL
Authors: Fang Jiayong , Han Yun , Zhou Zhongliang , Chen Shitao , Sheng Sheng 
Published: August 2021

Abstract
In the course of collaborative combat of multi-UAVs, there appear so many unpredictable fluctuations in the combat situation, and the mission assignment and decisionmaking of the combat are sequential and game-oriented, rendering it hard to build its dynamic and accurate model of operational missions. This paper breaks through the traditional research idea of mission modeling and optimization solution of collaborative operations of UAVs, and applies multi-agent reinforcement learning to the decision-making of multi-UAV collaborative combat, builds a verification environment of collaborative air-to-ground penetration and attacks of heterogeneous UAVs by designing MARL algorithm architecture, situation model, decision model and reward and punishment model, realizes the autonomous evolutionary learning of mission assignment and decision-making, and finally analyzes and evaluates the effectiveness and robustness of different MARL algorithms.
Electrical Characteristics of Floating-body and Body-contacted Silicon-on-insulator n-channel Transistor by TCAD Simulation
Authors: Shi Zhaolong 
Published: August 2021

Abstract
This work investigates the electrical characteristics of floating-body and body-contacted SOI devices with Synopsys Sentaurus TCAD simulations. Short channel effects, subthreshold slope, transconductance, DIBL, on and off current are compared and analyzed for floating-body and body-contacted SOI devices, which is useful for device design and optimization. At the same time, the results of TCAD numerical simulation are used to compare the floating body effect characteristics of the two kinds of devices. From the results, the performance of body-contacted SOI devices is better. All the figures in this paper are obtained from TCAD simulation data and results based on 2D device simulation. Circuit and 3D simulations are beyond the scope of this paper, which will be investigate in future work.
Simulation Design and Analysis of the Three-dimensional Shape Testing Device for Functional Microfilaments
Authors: Liu Shan , Yin Junqing , Qin Shujuan , Chen Yongdang , Gu Jinyu 
Published: August 2021

Abstract
In order to study the micromechanical properties of functional microwires in three-dimensional space morphology, a performance testing device for functional microwires in three-dimensional morphology combined load mode was designed. First, the microwire material is introduced into the three-dimensional weaving process, and the cubic B-spline function curve is used to fit the shape of the three-dimensional microwire, and then the spatial configuration of the microwire is constructed. Secondly, based on the three-dimensional morphology of the microwire, the function and principle of the microwire in the compound loading mode are analyzed, and a three-dimensional testing device for the microwire is designed. Finally, the key components of the designed device were analyzed through simulation, and the key components of the test device were all within their yield limits, which verified the rationality of the test device.
Primitive Knowledge Graph Construction Base on Eventelement Driven
Authors: Wang Nana , Guan Zhuoyun , Guo Yu 
Published: August 2021

Abstract
Knowledge graph is a popular research field in recent years. Starting from analyzing the dynamic needs and feasible ways of knowledge graph, A new idea of using matter elements as entities in the knowledge graph is proposed, and a dynamic evolution mechanism of knowledge graph driven by matter elements is established. Using the primitive theory to construct the framework structure of the primitive knowledge map.
Image Denoising Based on Dual-tree Complex Wavelet Transform and Convolutional Neural Network
Authors: Zhou Yilu , Fu Xiaojin 
Published: August 2021

Abstract
In view of the problem that the noise in the image will have a negative impact on the subsequent image processing, this paper proposes a noise reduction algorithm based on the dual-tree complex wavelet transform and convolutional neural network by using the characteristics of the DTCWT and CNN. Firstly, the two-dimensional image is decomposed into two parallel wavelet trees by double tree complex wavelet transform, which forms six high-frequency detail parts and two same low-frequency parts in different directions. Then, it is put into the designed deep convolution neural network for training, Finally, the six high-frequency components and one of the low-frequency components are recombined into the image after noise reduction by using the inverse transform of double tree complex wavelet. The simulation results show that PSNR and MS-SSIM of the image are better than other noise reduction algorithms, and the details of the original image can be restored well while noise reduction. It has practical application value in the case that the collected image has a large noise due to various reasons.
Improved Wolf Pack Algorithm for Solving a Class of Multi-Objective Route Optimization Problem
Authors: Jing Xin , Gao Hao , Zheng Li , Yue Tianxin 
Published: August 2021

Abstract
This paper considers a class of Multi-objective path planning and solving algorithms. The choice of step size is a very important factor that affects the iterative algorithm. This paper improves the classical Wolf Pack Algorithm (WPA) by designing an adaptive step size. This new improved wolf pack algorithm (IWPA) improves the classical wolf colony algorithm by designing an adaptive step size. It effectively solves the problem that the WPA may fall into a endless loop. The simulation results by MATLAB show that the IWPA has a good effectiveness than the WPA to solve multi-objective route optimization.
Implementation of Refuelling Order Service Algorithm and New Order Allocation Model of Ride-sharing Platform
Authors: Hu Congying , Liu Pingshan , Su Jiayue , Qiu Ruihong , Fang Junli 
Published: August 2021

Abstract
Aiming at the problem that online ride-hailing drivers often empty their cars to replenish fuel at gas stations when their cars run out of gas, a new order assignment algorithm is proposed. According to the vehicle fuel volume reported by the driver to the platform, the vehicle with low fuel volume will be automatically assigned to the destination close to the gas station orders, and the driver will be reminded to go to the nearby gas station to reduce the empty vehicle round-trip rate. First of all, orders are classified into ordinary orders and refuelling orders, so that when the vehicle is short of fuel, the driver can be assigned to the refuelling orders with destinations close to gas stations. Then, a new order allocation mathematical model is established. This paper solves the order assignment problem based on the heap-optimized Dijkstra’s algorithm and Astar algorithm. Experimental results show that the algorithm can intelligently allocate orders for drivers with insufficient fuel to their destinations closer to the gas station, shorten the distance the driver drives empty to the gas station to replenish fuel, and reduce the empty vehicle round-trip rate. When using Dijkstra's algorithm and Astar algorithm to solve the order allocation problem, there is no significant difference in their processing time.
Logistics Route Optimization Based on Improved Particle Swarm Optimization
Authors: Gao Zunhai , Lu Hongxia 
Published: August 2021

Abstract
An improved particle swarm optimization (PSO) algorithm is presented by dynamically adjusting the inertia weight in the iterative process of PSO, and it is used to solve the problem of logistics route optimization. This algorithm can not only improve the convergence speed, but also avoid falling into local optimum. In the process of improving the standard algorithm, two methods are proposed to adjust the inertia weight value according to the number of iterations. One is piecewise linear decreasing, another is linear decreasing. The results show that linear decline is better than piecewise linear decline to achieve the purpose of optimization, which is more conducive to accelerate the convergence rate and enhance the ability of optimization. Through the simulation experiment of the specific vehicle routing optimization problem, the results show that after the improvement, the optimization performance is enhanced, the optimization speed is accelerated, and the complexity is not increased, which greatly improves the performance of the original algorithm.
A Design of COSPAS-SARSAT Beacon with BDS Return Link Service
Authors: He Zehua , Lu Hongyang 
Published: August 2021

Abstract
This article describes a proto-type beacon, which supports search and rescue (SAR) return link service (RLS) provided by BeiDou Satellite Navigation System (BDS). According to the design of signal-in-space format of BDS RLS, with related technologies from COSPAS-SARSAT, comparing with Galileo RLS system, this article describes a design of BDS RLS beacon proto-type, and how it receives and processes return link message (RLM). Then three interfaces are analysed, which are the GNSS signal interface from the BDS satellite to the GNSS receiver, the GNSS receiver sentence interface from the GNSS receiver to the beacon processing unit and the human-machine interaction interface for the beacon to the user. Finally, its test result and cost-performance trade-off are discussed.
A Piecewise Parabolic Method for Estimating Key Parameters in a Three-dimensional Internal Tidal Adjoint Model
Authors: Cao Xianglong , Gao Wang , Deng Mingxuan , Li Ning , Jiang Dong 
Published: August 2021

Abstract
A higher-order and conservative Piecewise Parabolic Method was proposed to estimate the open boundary conditions (OBCs) in a 3D internal tidal adjoint model. The interpolation quality was verified by twin experiments. The results showed that the PPM can obtain smoother OBCs than the results obtained by Cressman interpolation. In real experiments, compared with the CI results, the PPM results can reduce the magnitude of misfit vector (m) between the simulated results and the observations of the tidal stations by 5 percent. Meanwhile, the PPM results can simulate the M2 tidal constituent in the northern South China Sea (SCS) more accurate than the Cressman results.
The Vertex-Gutman Index of the Wheel Graphs
Authors: Guo Haili 
Published: August 2021

Abstract
The Gutman index is parameter related to the degree and the distance in a graph. In this paper, the values of the vertex-Gutman index and the Gutman index of the wheel graphs are calculated, and the extremum of the vertex-Gutman index are studied. We obtained that, in the wheel graph, the vertex-Gutman index reaches the maximum at the center and the minimum at the vertices on the wheel.
Numerical Simulation of Tantalum-Tungsten Alloy for Forming Characteristics of EFP with Liner of Different Tungsten Contents
Authors: Ding Li 
Published: August 2021

Abstract
By LS-DYNA hydrocode, the EFP (Explosively Formed Projectile) forming characteristics of tantalum tungsten alloy are simulated. The EFP forming characteristics of tantalum tungsten alloy with different W contents under typical charge structure are obtained. The curvature range of the liner required for forming solid rod shaped EFP with large aspect ratio is determined, and the influence of tantalum tungsten alloy material’s constitution parameters on EFP forming is analyzed. The forming patterns of tantalum tungsten EFP with different tungsten contents are similar, but the range of outer curvature required for forming a solid EFP is different. The research results can provide references for EFP design and lay foundation for the application of high density tantalum tungsten alloy in the intelligent and smart ammunition.
Research about Dynamic Evolution of Supply Chain Based on Agent
Authors: Shao Yanhua , Min Zhao , Xia Dawen 
Published: August 2021

Abstract
During the research with respect to the traditional supply chain, Enterprise autonomy is ignored. Within this thesis, from the perspective of CAS, the dynamic growth of supply chain was inspected by using CAS versus evolutionary game theory. Within supply chain, the corporate was viewed as agent. In the same way, the variety branches of the corporate were viewed as sub-agents. The agent-based model of supply chain was set up in this thesis. At the same time, supply chain dynamic evolution was simulated through swarm. The effective solution to coordinate the supply chain main body behaviour was explored too. Within this thesis, the evolutionary trait of supply chain is explored, and a reference for supply chain governance is provided.
On the space resolution of the μ-RWELL
Authors: Bencivenni G. , Capoccia C. , Cibinetto G. , de Oliveira R. , Farinelli R. , Felici G. , Gatta M. , Giovannetti M. , Lavezzi L. , Morello G. , Poli Lener M. , Tskhadadze E. 
Published: August 2021

Abstract
In micro-pattern gaseous detectors (MPGD) the evaluation of the space resolution with the charge centroid method provides large uncertainty when the incident particle is not perpendicular to the readout plane. An improvement of the position reconstruction is given by the microTPC (μTPC) algorithm: the three-dimensional reconstruction of the particle track inside the detector drift gap is performed using the arrival time of the induced signals on the readout. In this work we report the application of this method to the μ-RWELL detector that, combined with the charge centroid, allows to achieve an almost uniform resolution below 100 μm over a wide angular range.
Numerical analyses of a base connection for a thin-walled cold-formed profile column
Authors: Venghiac V M , Olteanu-Donțov I , Alexa-Stratulat M S , Țăranu G , Băetu S A , Toma I O 
Published: August 2021

Abstract
Thin-walled cold-formed steel structures tend to gain more attention in the civil engineering field. Ground-floor dwellings, as well as factory warehouses represent the most frequent use of these structural systems. However, due to the inherent flexibility of thin-walled cold-formed steel elements, the designer has to take into consideration the possibility of large deformations occurrence, especially in the case of structures with large openings. Such deformations may lead to significant stresses at the level of the connection joints between elements or between elements and the foundation block. The paper presents a comparative numerical analysis based on the finite element method to assess the efficiency of a connection joint between the columns of a portal frame and the foundation block. The linear and nonlinear analyses were carried out by means of Robot Structural Analysis and Ansys. The column is made of two thin-walled cold-formed C shape profiles positioned back-to-back. The efficiency was assessed both from a stress-state point of view in the column and in the connection parts, as well as from the point of view of the manufacturing process and implementation. Significant differences were observed regarding the stress distribution in the nonlinear analysis.
Methodological approaches to creating the electronic databases of building operation safety
Authors: Kolesnichenko S , Seliutin I , Grytsuk Y 
Published: August 2021

Abstract
One of the tasks of ensuring the safety of construction sites is to maintain or increase the design reliability of buildings and structures during their renovation and reconstruction. The reliability of the object is calculated at all stages of its life cycle and for kinds of work corresponding to these stages. An effective method of determining quality indicators is the registration method, which is based on observations of the actual condition of the building structure. The registration of the condition of the elements and the construction is carried out through complex characteristics allowing to estimate the rate of imperfections (defects and damages-DD) progression throughout time, and to define their criticality level. For building structures (facilities), the registered DD allows performing the analysis of types, consequences, and the criticality of possible failures (FMECA classification). The proposed strategy includes the process approach to resource management through developing a system of accounting and functional controlling, analysis, and regulation of safety. One of the alternate solutions of the problem may be the establishment of information systems based on registration methods, namely electronic databases (DB) of defects and damages of structures. Information databases in the conditions of an actual enterprise may become the first but still very important step on the way to generalizing and controlling the data about the actual state of building structures and facilities for further decision-making concerning their operation and maintenance. The database is to be implemented in the network form, with a clear hierarchical access framework and editing capabilities for the officials, the ability to generate reports and extracts. The obtained results in the framework of the reliability-assurance program should provide the ability to calculate the probability of failure-free operation, the residual resource with assigned level of risk.
Bio product used in the self-sealing process of microcracks in hydrotechnical concretes
Authors: Sbirlea C , Isopescu D N , Ungureanu D , Maxineasa S G 
Published: August 2021

Abstract
This paper is focused on quantifying the influence of the Bio materials that are used in the self-healing process of concrete. The Bio material that was studied has a high content of calcium carbonate, which, after precipitation, may lead to the sealing of the microcracked surface of concrete. This nucleation process is possible only in humid environments; thus, water has a paramount role in ensuring the mobility of the molecules. The difference between a complete and a partial seal is given by the amount of the Bio product that is available in the cracked area, the size of the calcium carbonate particles and the amount of water. For this study, the SEM Quanta Dual Beam device was used, through which scans were performed by electron microscopy, in order to observe the precipitation of the Bio product on the cracked surface. The chemical process throughout the sealing takes place has been presented through various illustrations and reports. By analysing previous experimental studies, it might be stated that the use of calcium carbonate in various forms is a sustainable and an environmentally friendly repair solution that, also, may improve the durability of cement-based materials. The use of ecological products in new cement-based materials is one of the main topics of worldwide interest for various research teams.
Ecological and economic impact of an innovative bioproduct used to consolidate the concrete elements of hydrotechnical constructions
Authors: Sbirlea C , Isopescu D N , Ungureanu D , Maxineasa S G 
Published: August 2021

Abstract
The present paper takes into observation the evaluation of the environmental and economic impact of a innovative bioproduct that can be used in order to reduce the volume of rehabilitation works needed during the life cycle of different structural reinforced concrete elements utilized for hydrotechnical constructions. In order to determine the performances of the analysed material, seven scenarios that imply the use of different rehabilitation solutions have been considered. In order to achieve the goal of the study, the Cradle-to-Gate Life Cycle Assessment type of study was used. The amount of materials, the distances from the extraction point to the site of the materials and the implementation technology are detailed in all proposed scenarios. In recent years, researchers carried out various studies on the use of raw materials in different compositions, with different quantities, in order to improve the sustainability and mechanical characteristics of constructions, as well as to increase the users’ level of satisfaction. The research and development of new types of materials that can be used in the construction sector with a low ecological influence will have a tremendous positive impact over the present state of the natural environment. The authors conclude that by considering the resulted values, the analysed solution based on the use of calcium carbonate can be considered a suitable solution with respect to the environmental and economic dimensions of sustainability.
Investigation of parameters affecting the soil amplification by means of 1-D analysis
Authors: Gürtürk C C , Selçuk M E 
Published: August 2021

Abstract
The increase in the amplitude of earthquake waves as they pass through layers of soft soil close to the surface can have significant effects on ground amplification and structural damage. The aim of this study is; ground response analysis was performed using 1D (One Dimensional) Equivalent Linear Analysis method with DeepSoil software for specific soil profiles. The analyses were carried out with 3 different strong ground motions selected in accordance with the response spectrum. Strong ground motion records selected according to the regulation were scaled in accordance with the spectrum in the frequency domain. Analysis results were compared with the Turkish Earthquake Response Regulations 2018 (TEBR 2018). It is explained how the soil transfer functions, namely how the amplification functions vary depending on the parameters of the soil layer thickness and shear wave velocity. Depending on the characteristics of the soil profile, it has been observed that the incoming earthquake waves only amplify those in a certain frequency range. By performing ground response analysis, it should be known which frequency content of the ground amplification and therefore which types of structures will affect and the design should be made by considering these criteria.
Comparative study on the structural behaviour of a 30m height building with a RC frames structure located in a high intensity seismic area
Authors: Țăranu G 
Published: August 2021

Abstract
This paper presents an analysis of the Finite Element Model structural system of a building in the Vrancea, Romania seismic area. The studied structure is a part of a set of 3 buildings with a height of 30 m. The height of the levels is 4.5 m and 3.5 m. Due to the vertical irregularities, the distribution of the functions and the location of the building, it is necessary to identify an optimized structural solution for a more balanced behaviour to the seismic action. Thus, various structural models and results are presented regarding the process of establishing the positions and dimensions for structural elements.
Modeling of rectangular plates by the elastic scheme method
Authors: Stoynova I , Handruleva A , Dimitrova A 
Published: August 2021

Abstract
This study presents an approach, based on correction coefficients, by which bending moments in rectangular plates when obtained by the elastic scheme method, can be calculated more accurately. At first, the well-known generalized coefficients, used in the elastic scheme method, and also taken from different literature sources are juxtaposed. The correction coefficients are obtained by the FEM according to the thin elastic plate theory. On the next stage, by looking into the shear deformability of the plate cross-section, the values of these coefficients are provided in a more accurate manner. The research has been done for a quadratic plate, but the aforenamed approach can be used to investigate any general rectangular plate, as well.