Pub Date : 2020-12-30DOI: 10.12783/dtcse/cisnr2020/35145
Bian Qingqing, Ma Xuejie, Liu Yingjie, Su Jiang, Zheng Hongbo
In order to improve the smoothness of the movement process of the arm system, this paper adopts Modelica multi-domain modeling simulation technology based on MWorks platform to analyze and improve the boom system of a concrete pump. Firstly, the mechanical rigid-flexible coupling model and hydraulic model of the arm system of a concrete pump truck are built; in order to study the influencing factors of the arm movement smoothness, stiffness and damping of hydraulic system under the joint arm linkage condition in the arm system are simulated and analyzed; finally, the corresponding optimization and improvement scheme is put forward according to the simulation results. The experimental results show that compared with the original system, the proposed improvement scheme significantly improves the smoothness, which provides theoretical basis and technical support for product improvement.
{"title":"Dynamics Simulation Analysis and Optimal Design of the Boom System of a Concrete Pump Truck","authors":"Bian Qingqing, Ma Xuejie, Liu Yingjie, Su Jiang, Zheng Hongbo","doi":"10.12783/dtcse/cisnr2020/35145","DOIUrl":"https://doi.org/10.12783/dtcse/cisnr2020/35145","url":null,"abstract":"In order to improve the smoothness of the movement process of the arm system, this paper adopts Modelica multi-domain modeling simulation technology based on MWorks platform to analyze and improve the boom system of a concrete pump. Firstly, the mechanical rigid-flexible coupling model and hydraulic model of the arm system of a concrete pump truck are built; in order to study the influencing factors of the arm movement smoothness, stiffness and damping of hydraulic system under the joint arm linkage condition in the arm system are simulated and analyzed; finally, the corresponding optimization and improvement scheme is put forward according to the simulation results. The experimental results show that compared with the original system, the proposed improvement scheme significantly improves the smoothness, which provides theoretical basis and technical support for product improvement.","PeriodicalId":11066,"journal":{"name":"DEStech Transactions on Computer Science and Engineering","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79769955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-30DOI: 10.12783/dtcse/cisnr2020/35146
Wenlong Zhang, Xiaoliang Sun, Qifeng Yu
This paper proposed a fast multi exposure images fusion algorithm based on the camera response function for high dynamic range scene imaging, which greatly improve the efficiency and ensure the good quality of the fused image. The algorithm calibrated the camera response function in advance, and then calculated the mapping curve between the scene illuminance and pixel value according to the exposure time. When fuse multi-exposure images, the mapping curves of the images are connected to obtain a new mapping curve which can curve the whole luminance range. Then the fused image can be obtained through the new mapping curve. The experimental results demonstrate the good effectiveness and high efficiency of proposed algorithm.
{"title":"Fast Exposure Fusion Based on Camera Response Function","authors":"Wenlong Zhang, Xiaoliang Sun, Qifeng Yu","doi":"10.12783/dtcse/cisnr2020/35146","DOIUrl":"https://doi.org/10.12783/dtcse/cisnr2020/35146","url":null,"abstract":"This paper proposed a fast multi exposure images fusion algorithm based on the camera response function for high dynamic range scene imaging, which greatly improve the efficiency and ensure the good quality of the fused image. The algorithm calibrated the camera response function in advance, and then calculated the mapping curve between the scene illuminance and pixel value according to the exposure time. When fuse multi-exposure images, the mapping curves of the images are connected to obtain a new mapping curve which can curve the whole luminance range. Then the fused image can be obtained through the new mapping curve. The experimental results demonstrate the good effectiveness and high efficiency of proposed algorithm.","PeriodicalId":11066,"journal":{"name":"DEStech Transactions on Computer Science and Engineering","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81858840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-30DOI: 10.12783/dtcse/cisnr2020/35136
Yao Wang, Yi Jiang, Silei Cao
The target detection and recognition technology based on deep learning has high accuracy and speed of target recognition, which is a feasible way to realize the precise strike of anti-ship missiles and the essential way for the development of intelligent combat. Based on the development background of anti-ship missile precision strike and second-stage target detection networks, this paper proposed to achieve accurate detection and recognition of ship targets through Faster R-CNN network, and suggested to achieve maritime multi-targets through Mask R-CNN network. The detection method explored and find a feasible way to achieve the precise strike of anti-ship missiles.
{"title":"Based on the Second-stage Detection Networks to Realize Accurate Detection and Recognition For Anti-ship Missiles","authors":"Yao Wang, Yi Jiang, Silei Cao","doi":"10.12783/dtcse/cisnr2020/35136","DOIUrl":"https://doi.org/10.12783/dtcse/cisnr2020/35136","url":null,"abstract":"The target detection and recognition technology based on deep learning has high accuracy and speed of target recognition, which is a feasible way to realize the precise strike of anti-ship missiles and the essential way for the development of intelligent combat. Based on the development background of anti-ship missile precision strike and second-stage target detection networks, this paper proposed to achieve accurate detection and recognition of ship targets through Faster R-CNN network, and suggested to achieve maritime multi-targets through Mask R-CNN network. The detection method explored and find a feasible way to achieve the precise strike of anti-ship missiles.","PeriodicalId":11066,"journal":{"name":"DEStech Transactions on Computer Science and Engineering","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86989287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-30DOI: 10.12783/dtcse/cisnr2020/35147
Xijia Bian, Yuanjian Liu, Yaxin Yan, Anwen Ren, Shuangde Li
The combination of millimeter-wave and MIMO channel is a hotspot in the research of fifth-generation (5G) communication in recent years. In this paper, the SBR method is used to simulate a typical indoor office environment in the line-ofsight (LoS) scenario and the near-field scenario. The frequency is 28 GHz, and the receiver is an 8*8 vertical planar array. Firstly, the effectiveness of the SBR method is verified by analyzing the power angle profiles (PAPs) of the azimuth angle of arrival (AAoA). Secondly, the spatial non-stationary characteristics of the millimeter-wave MIMO channel are analyzed through the received power and power delay distribution of elements at the antenna’s array. Some characteristics of the millimeter-wave MIMO channel are revealed from these analyses.
{"title":"Study on Propagation Characteristics of Indoor 28 GHz MIMO Channel Based on the SBR/Image Method","authors":"Xijia Bian, Yuanjian Liu, Yaxin Yan, Anwen Ren, Shuangde Li","doi":"10.12783/dtcse/cisnr2020/35147","DOIUrl":"https://doi.org/10.12783/dtcse/cisnr2020/35147","url":null,"abstract":"The combination of millimeter-wave and MIMO channel is a hotspot in the research of fifth-generation (5G) communication in recent years. In this paper, the SBR method is used to simulate a typical indoor office environment in the line-ofsight (LoS) scenario and the near-field scenario. The frequency is 28 GHz, and the receiver is an 8*8 vertical planar array. Firstly, the effectiveness of the SBR method is verified by analyzing the power angle profiles (PAPs) of the azimuth angle of arrival (AAoA). Secondly, the spatial non-stationary characteristics of the millimeter-wave MIMO channel are analyzed through the received power and power delay distribution of elements at the antenna’s array. Some characteristics of the millimeter-wave MIMO channel are revealed from these analyses.","PeriodicalId":11066,"journal":{"name":"DEStech Transactions on Computer Science and Engineering","volume":"320 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83448781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-30DOI: 10.12783/dtcse/cisnr2020/35138
Weimin Di, Huiling Wang, Yaoxue Yue
The construction of rural express station (RES) is an important measure to improve the express delivery outlets and save the “last mile” distribution cost. In order to scientifically plan the rural express logistics network, a location optimization model of RES is established considering vehicle routes of the distribution center and the tasks of parcel dispersion and collection. With the help of the model, the following items can be determined, such as the location of RES, the village groups serviced by different express stations, the number of delivery vehicles required by the distribution center, the route of each delivery vehicle and the optimal average daily cost of the distribution system. The model is applied to RES location problem in a certain town, and a feasible solution is obtained.
{"title":"Location Optimization Model of Rural Express Station with Vehicle Routes Consideration","authors":"Weimin Di, Huiling Wang, Yaoxue Yue","doi":"10.12783/dtcse/cisnr2020/35138","DOIUrl":"https://doi.org/10.12783/dtcse/cisnr2020/35138","url":null,"abstract":"The construction of rural express station (RES) is an important measure to improve the express delivery outlets and save the “last mile” distribution cost. In order to scientifically plan the rural express logistics network, a location optimization model of RES is established considering vehicle routes of the distribution center and the tasks of parcel dispersion and collection. With the help of the model, the following items can be determined, such as the location of RES, the village groups serviced by different express stations, the number of delivery vehicles required by the distribution center, the route of each delivery vehicle and the optimal average daily cost of the distribution system. The model is applied to RES location problem in a certain town, and a feasible solution is obtained.","PeriodicalId":11066,"journal":{"name":"DEStech Transactions on Computer Science and Engineering","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78177453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-30DOI: 10.12783/dtcse/cisnr2020/35164
Min Wang, Peng Wang, Suqin Wu, Chong Sun
This paper has established the COVID-19 SIR Dynamical Prediction Model. First, the official data is devoted to fit and simulate the spread of the epidemic, and the spread of speed of some countries. Then, in the next period of time the number of infected persons and several numerical trends are predicted. Finally, the error of the population infected is calculated and the result is 7.09%. It proposed the solution to solve practical problems.
{"title":"The COVID-19 SIR Dynamical Prediction Model for Eradicating Corona Virus Disease 2019","authors":"Min Wang, Peng Wang, Suqin Wu, Chong Sun","doi":"10.12783/dtcse/cisnr2020/35164","DOIUrl":"https://doi.org/10.12783/dtcse/cisnr2020/35164","url":null,"abstract":"This paper has established the COVID-19 SIR Dynamical Prediction Model. First, the official data is devoted to fit and simulate the spread of the epidemic, and the spread of speed of some countries. Then, in the next period of time the number of infected persons and several numerical trends are predicted. Finally, the error of the population infected is calculated and the result is 7.09%. It proposed the solution to solve practical problems.","PeriodicalId":11066,"journal":{"name":"DEStech Transactions on Computer Science and Engineering","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75319769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-30DOI: 10.12783/dtcse/cisnr2020/35131
Dan Fan, Yan Nie, Yuhang Yang
This paper introduces a method to improve the directivity of directional coupler. Adding open-stub to each section of the parallel coupling line. The open-stub is equivalent to a capacitance element to compensate the discontinuity of two adjacent coupled line junction. The simulation results show that this method can effectively improve the directivity of stripline directional coupler. In this paper, a Ku-band stripline directional coupler is designed, the directivity value of the directional coupler is -17dB without open-stubs. However, the directivity of the directional coupler improves 13dB with open-stubs.
{"title":"Design of Ku-band High Directivity Directional Coupler","authors":"Dan Fan, Yan Nie, Yuhang Yang","doi":"10.12783/dtcse/cisnr2020/35131","DOIUrl":"https://doi.org/10.12783/dtcse/cisnr2020/35131","url":null,"abstract":"This paper introduces a method to improve the directivity of directional coupler. Adding open-stub to each section of the parallel coupling line. The open-stub is equivalent to a capacitance element to compensate the discontinuity of two adjacent coupled line junction. The simulation results show that this method can effectively improve the directivity of stripline directional coupler. In this paper, a Ku-band stripline directional coupler is designed, the directivity value of the directional coupler is -17dB without open-stubs. However, the directivity of the directional coupler improves 13dB with open-stubs.","PeriodicalId":11066,"journal":{"name":"DEStech Transactions on Computer Science and Engineering","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84505934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-03DOI: 10.12783/dtcse/msam2020/34228
P. Kossakowski
The article deals with the practical application of damage mechanics for modelling and predicting the failure of materials and structural elements. One of the recently developed and used models of Bai–Wierzbicki material is discussed in more detail. In this model the effect of hydrostatic pressure and the third invariant of the deviatoric stress on the process of the material plastic deformation is taken into account. It allows to model damage processes in the material and predict its total failure with high accuracy. Consequently, this enables the practical application in engineering calculations of structural elements. As an example, several such analyses were presented and discussed. They included the simulations of tensile elements made of C45E+N steel under proportional and non‐ proportional loading conditions in uniaxial and spatial stress state. Another analysis considered numerical simulations of the ductile fracture in Battelle Drop-Weight- Tear (BDWT) specimens used in pipeline sections tests. The problem concerned the phenomenon of block shear failure in bolted steel connections was the subject of the last presented simulations.
{"title":"Application of Damage Mechanics for Prediction of Failure of Structural Materials and Elements","authors":"P. Kossakowski","doi":"10.12783/dtcse/msam2020/34228","DOIUrl":"https://doi.org/10.12783/dtcse/msam2020/34228","url":null,"abstract":"The article deals with the practical application of damage mechanics for modelling and predicting the failure of materials and structural elements. One of the recently developed and used models of Bai–Wierzbicki material is discussed in more detail. In this model the effect of hydrostatic pressure and the third invariant of the deviatoric stress on the process of the material plastic deformation is taken into account. It allows to model damage processes in the material and predict its total failure with high accuracy. Consequently, this enables the practical application in engineering calculations of structural elements. As an example, several such analyses were presented and discussed. They included the simulations of tensile elements made of C45E+N steel under proportional and non‐ proportional loading conditions in uniaxial and spatial stress state. Another analysis considered numerical simulations of the ductile fracture in Battelle Drop-Weight- Tear (BDWT) specimens used in pipeline sections tests. The problem concerned the phenomenon of block shear failure in bolted steel connections was the subject of the last presented simulations.","PeriodicalId":11066,"journal":{"name":"DEStech Transactions on Computer Science and Engineering","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81811072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-03DOI: 10.12783/dtcse/msam2020/34235
Xiaofeng Xu, Ji Dai, Gao Yang
Software Defined Network (SDN) is a new network innovation architecture that separates the control layer and the data layer of the network. In the SDNs, the control layer is the core of the entire network, and its security is very important. In practical applications, the control layer is usually composed of SDN controller clusters. In order to enhance the security of the SDN controller cluster, this paper first studies the development status of the current SDN technology, and then analyzes the current state of the defense technology of the network system. Through the analysis and summary of the two, we proposed the discovery and isolation scheme of the invaded controller in the cluster environment, and designed the intrusion detection module, control module and defense module. Finally, we implemented the scheme based on Opendaylight controller, and proved the effectiveness of the scheme by experiments.
{"title":"An SDN Controller Security Cluster Scheme Based on Intrusion Detection Technology","authors":"Xiaofeng Xu, Ji Dai, Gao Yang","doi":"10.12783/dtcse/msam2020/34235","DOIUrl":"https://doi.org/10.12783/dtcse/msam2020/34235","url":null,"abstract":"Software Defined Network (SDN) is a new network innovation architecture that separates the control layer and the data layer of the network. In the SDNs, the control layer is the core of the entire network, and its security is very important. In practical applications, the control layer is usually composed of SDN controller clusters. In order to enhance the security of the SDN controller cluster, this paper first studies the development status of the current SDN technology, and then analyzes the current state of the defense technology of the network system. Through the analysis and summary of the two, we proposed the discovery and isolation scheme of the invaded controller in the cluster environment, and designed the intrusion detection module, control module and defense module. Finally, we implemented the scheme based on Opendaylight controller, and proved the effectiveness of the scheme by experiments.","PeriodicalId":11066,"journal":{"name":"DEStech Transactions on Computer Science and Engineering","volume":"123 12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81651091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-03DOI: 10.12783/dtcse/msam2020/34243
Hairong Song, Shudao Zhou, Xiaolei Wang, Song Ye, Zhentao Chen
In order to study the characteristics of the Karman vortex street generated in the flow around the bluff body, this paper uses the numerical model of the large eddy simulation to numerically simulate the flow around the two-dimensional cylinder. Combined with the simulation data, this paper validates and analyzes the Karman vortex phenomenon, and studies the properties of the vortex shedding when the boundary layer is separated in the flow around the cylinder. The simulation results show that the inflow around the cylinder will produce two different characteristics of the vortex. The high velocity vortex is generated outside the boundary layer, and the small velocity vortex is generated inside the boundary layer, and the two alternately fall off to form the vortex street; When the size of the flow-through cylinder is constant, the falling vortex increases with the increase of the flow velocity, and when the flow velocity increases to a certain value, the vortex size will remain unchanged; When kept constant, the vortex is positively correlated with the size of the cylinder. The results obtained in the paper describe the Carmen vortex street generated in the flow around the two-dimensional cylinder in a relatively detailed way. Finally, this paper provides a reference for studying turbulent energy dissipation and boundary layer separation.
{"title":"Numerical Simulation of Vortex Street Around the Two-Dimensional Cylinder Based on LES","authors":"Hairong Song, Shudao Zhou, Xiaolei Wang, Song Ye, Zhentao Chen","doi":"10.12783/dtcse/msam2020/34243","DOIUrl":"https://doi.org/10.12783/dtcse/msam2020/34243","url":null,"abstract":"In order to study the characteristics of the Karman vortex street generated in the flow around the bluff body, this paper uses the numerical model of the large eddy simulation to numerically simulate the flow around the two-dimensional cylinder. Combined with the simulation data, this paper validates and analyzes the Karman vortex phenomenon, and studies the properties of the vortex shedding when the boundary layer is separated in the flow around the cylinder. The simulation results show that the inflow around the cylinder will produce two different characteristics of the vortex. The high velocity vortex is generated outside the boundary layer, and the small velocity vortex is generated inside the boundary layer, and the two alternately fall off to form the vortex street; When the size of the flow-through cylinder is constant, the falling vortex increases with the increase of the flow velocity, and when the flow velocity increases to a certain value, the vortex size will remain unchanged; When kept constant, the vortex is positively correlated with the size of the cylinder. The results obtained in the paper describe the Carmen vortex street generated in the flow around the two-dimensional cylinder in a relatively detailed way. Finally, this paper provides a reference for studying turbulent energy dissipation and boundary layer separation.","PeriodicalId":11066,"journal":{"name":"DEStech Transactions on Computer Science and Engineering","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79460702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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