bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Implementation of Student Management System Based on Internet Big Data
Authors: Li Zhi
Published: August 2021

Due to fast development and wide popularization of information technology, the traditional teaching ideas, teaching methods, teaching processes and teaching organizations have changed, which has caused fundamental changes in teaching mode and education system. The student management system in view of Web technology is the main carrier of information administration in universities. This paper puts forward a solution to the self-management system of universities based on big data mobile internet. This system is related to self-learning, self-management, and using multiple mobile internet applications to help students use the self-management system, in order to improve students’ ardour and initiative take part in teaching activities; The learning process management and curriculum evaluation management have been established, and the teaching quality has been comprehensively considered from multiple dimensions, so that the training have a gift for universities has been effectively guaranteed.
Research on Distributed Storage Technology of Database Big Data Based on Cloud Computing
Authors: Hongwei Duan , Ligetu Bi
Published: August 2021

With China entering the era of big data, the storage and management of big data has become a hot issue. The proposal and use of distributed storage technology has achieved good results. The continuous development of Internet communication technology and the popularization of computer information technology promote the evolution of traditional data model. The distributed storage system for big data has strong expansibility. It can optimize the existing storage space, realize the optimal allocation of space resources, and reduce the cost of data storage. Cloud computing as a resource sharing business computing model, it receives a huge amount of data every day, and the amount of data is still expanding. This has caused great pressure on distributed storage in cloud computing environment. This paper studies the distributed storage technology of database big data based on cloud computing, in order to strengthen the data management in the era of big data and improve the security and utilization of data.
Design and Implementation of University Network Education Platform Based on Cloud Computing
Authors: Xiaomei Song
Published: August 2021

With the continuous progress of science and technology, the information society has also come. The emergence of cloud computing has made China’s information platform more open, and at the same time, it has given unlimited opportunities for the development of all walks of life. The traditional single teaching mode in universities is no longer suitable for the development of modern students. In the internet plus era, universities built a network teaching platform to enrich students’ learning methods. The use of the network teaching platform improved students’ learning interest and stimulated students’ learning potential. Cloud computing itself has obvious characteristics, which guarantees services under various measures. It is outstanding in scalability, virtualization and high versatility, and can be applied in different fields. People can get more educational resources through the network education platform of universities based on cloud computing, so as to make the education of universities exert greater value. Based on this, this paper mainly discusses the construction strategy of university network education platform based on cloud computing.
Construction of Electronic Educational Game Design Pattern Based on Feature Extraction Technology
Authors: Liang Zhigan
Published: August 2021

With the popularity of computer and Internet, online games and educational games have become very common forms of entertainment in our daily life. Especially for teenagers, all kinds of games have become an indispensable part of their extracurricular activities. The emergence of Educational Games brings entertainment and interest to students’ boring learning, which can realize the change of students from tired of learning to willing to learn. Its purpose is to stimulate learners’ interest in learning and promote learners’ autonomous learning. Whether the design of educational games matches the characteristics of learners is the key factor to determine the success of educational game design. The design of educational games must be based on the characteristics of learners. Based on the feature extraction technology, this paper analyzes the construction method of the design pattern of electronic educational games, strives to balance the educational and game nature of electronic educational games in the design program, and provides a new idea for the construction of teaching resource database.
RETRACTED: Lightweight Visualization of 3D Model Based on Cloud Computing Information System
Authors: Tang Baoyan , Liu Qianqian
Published: August 2021

The processing requirements of 3D model data in modern manufacturing industry and the data type characteristics of 3D model data source. With the popularity of modern cloud computing platform and the technical advantages of cloud computing platform, the 3D model information is stored in the information system, and the cloud computing technology is used to manage the information system. The purpose of this article is to combine cloud computing technology with lightweight 3D visualization technology such as acrobat 3D to realize lightweight visualization of 3D model in information system. With the advantage of cloud computing platform which does not occupy local resources and has large data processing capacity combined with lightweight 3D visualization technology such as Acrobat 3D,3D model data can be visualized in cloud fast traffic. This paper investigates and studies, compares the speed of reading information between the information system using cloud computing technology and the ordinary local storage information system, and tries to find out the advantages of cloud computing compared with the traditional information system. In addition, this paper also optimizes lightweight on the basis of 3D model data set. Reduce the collective product of its data without destroying the visualization of its basic information.
Design of real-time data analysis system for physical training based on data mining technology
Authors: Hui Deng , Jin Wang
Published: August 2021

In competitive sports, the most direct and effective way to improve athletes’ competitive level is to strengthen training. At present, the training mode is still mainly based on coaches’ experience and athletes’ physical conditions, and lacks scientific and effective data information as the basis for planning. In this paper, the software is developed in the core construction of recessed Linux, the VIX bus technology is take advantage of gather sports data, and the data mining technology based on collective information characteristic extraction is designed. This paper uses big data mining method to mine the information of sports evaluation, pick up the autocorrelation characteristics of data information flow of sports training real-time data analysis system, constructs the association rule feature set combined with the prior knowledge of sports evaluation, and realizes the database construction of sports training real-time data analysis system by using the association rule feature extraction and big data information fusion processing technology. The simulation results show that the accuracy of sports assess decision-making information mining using the real-time data analysis system of sports training is high, and the dependability of the system is satisfied.
Network Security Protection Technology under the Background of Computing Big Data
Authors: Chen Shanjie
Published: August 2021

Based on the risk analysis of the network security of the radio and television critical information infrastructure, this paper introduces the evolution process of the network security protection architecture, and proposes the network security intelligent protection architecture. The article starts from the protection content and methods of physical security, network security, border security, server security, terminal security, application security, data security and backup and recovery, security management center and other technical aspects. Construction is explored. The thesis builds a reliable and stable broadcast technology center network information security system through the establishment of a network information security technology guarantee and a network information security management system.
Smooth particle hydrodynamics simulation of dam-break impacting different obstacles
Authors: Tian Xiewei
Published: August 2021

Aiming at the problems of smoothed particle hydrodynamics (SPH) method boundary imposing difficulties and particles easily penetrating solid walls, an improved complex boundary processing method is proposed. First, the improved SPH method is applied to numerically simulate the dam-break flow problem, and the numerical results are compared with the experimental results to verify the effectiveness of the method; then, the flux is added to the continuity equation to improve the pressure; finally, Numerical simulation is carried out to study the flow state of the dam-break water under different conditions of impacting on different obstacles, and the obstacles are considered as columnar, columnar with holes, wedge-shaped, semi-circular, 1/4 lower right circle obstacles and 1/4 upper right circle obstacles. The results show that: the stable pressure field can be obtained by adding flux; the improved boundary treatment method can effectively prevent particles from penetrating the solid wall, which is suitable for any complex boundary; SPH method has significant advantages in dealing with strongly nonlinear extreme deformation flow problems such as dam-break.
Numerical simulation of the forming characteristics of the circumferential MEFP with integrated shell and liner
Authors: Ma Guangsong , He Guanglin , Zhang Yulong , Qiao Zenghui
Published: August 2021

To study the forming characteristics of the multiple explosively formed projectile (MEFP) warhead of the small-caliber grenade with the integrated design of the liner and shell, the liner thickness is less than the shell thickness as the research object, and LS-DYNA is used for numerical simulation. On this basis, the influence of the curvature radius and the center thickness of the liner on the forming results of the projectile is further studied, and the integrated design of the MEFP forming result and the separate design were compared and analyzed. The simulation results show that, when the liner thickness structure is smaller than the shell thickness, the projectile shape is better. The shape of MEFP with the integral design is better than the separate design, and the forming velocity of the integral design is slightly lower than the separate design with the curvature radius increase of the outer and inner wall. When the liner curvature radius is fixed, the shape of MEFP with the integral design is better than the separate design, and the forming velocity of MEFP with the integral design is slightly less than the separate design with the liner center thickness increase. The results show that the forming characteristics of circumferential MEFP of integrated design and separate design have a certain similarity. The shape of MEFP with the integrated design is better than that with separate design, however, the forming velocity of MEFP with the integrated design is slightly lower than that with separate design.
Research and application of SPH parallel algorithm based on particle decomposition
Authors: Wang Siqi
Published: August 2021

Smoothed Particle Hydrodynamics (SPH), as a typical meshless numerical method, has it advantage in modeling free surface flows. However, this method is computationally time-consuming. To resolve this problem, we propose a SPH parallel algorithm based on particle decomposition, which evenly distributes all particles to each process for calculation. In this circumstance, the functions including send, receive, and broadcast are called only once for each time step of communication, which is easy to implement and also has a good scalability. To verify the effectiveness of the proposed algorithm, we perform the numerical simulations of 2D dam-break flow and 3D droplet impact onto a liquid film. It is demonstrated that the proposed SPH parallel algorithm can significantly reduce the simulation time and has a massive advantage on 3D large-scale computation; the maximum speed-up ratio can up to 30 when the number of particles is more than million.
Study on the Influence of Printhead Intake Velocity on Pressure of Sand Mold 3D Printer
Authors: Shi Haoming , Shan Zhongde , Guo Zhi , Yan Dandan
Published: August 2021

To achieve the precise forming of sand mold for 3D printing, the relationship between the printhead intake and the pressure fluctuation in the printhead during startup and printing of sand mold 3D printer was studied, and the relationship between the two and the causes of pressure fluctuation is analyzed. With the help of computational fluid dynamics and Fluent software, the internal flow model at a single nozzle is established, and the ink flow under 10 groups of different inlet velocities is simulated to obtain the flow contour and pressure fluctuation values. Combined with the small-channel gas-liquid flow pattern, the relationship among the air intake velocity and the pressure fluctuation and the reasons for the pressure fluctuation are analyzed. The results show that with the increase of intake velocities, the pressure fluctuation amplitude increases. In addition, the disturbance degree of gas-liquid interface wave leads to the difference of pressure fluctuation amplitude as the gas-liquid flow pattern changing. The simulation results agree with the experiments. Therefore, according to the relationship between the intake velocity and the pressure fluctuation amplitude, the stability of the printing system can be improved by limiting the speed ratio of supply pump and return pump.
Sensitivity analysis of coiled tubing erosion wear based on FLUENT
Authors: Cao Yinping , Chen Zetian , Pan Ying , Wang Jianxing , Mi Hongxue , Dou Yihua
Published: August 2021

Erosion wear is the main reason for the failure of coiled tubing during hydraulic jet fracturing operations. Taking Φ 60.325mm × 4.775mm CT90 coiled tubing as the research object. Three-dimensional finite element model of coiled tubing is established. The effects of mass flow, particle flow rate, particle diameter and other sensitive factors on the erosion characteristics of coiled tubing were analyzed by FLUENT software. The research results show that: The erosion wear rate of coiled tubing shows a nonlinear increasing trend with the increase of mass flow and particle flow rate, and the increasing trend is firstly slow and then sharply. As the particle diameter increases, the maximum erosion rate of coiled tubing changes irregularly. The particle flow rate is most sensitive to the erosion of coiled tubing. The finite element method used in this article provides a reference for the evaluation of the erosion wear of coiled tubing in hydraulic fracturing operations.
Optimization of Abrasive Water Jet Nozzle Based on Numerical Simulation
Authors: Deng Jiangsheng , Yuan Yuefeng , Li Deran , Cheng Hai , Dai Cheng , Shen Jian , Xie Fei , Wang Jiasheng
Published: August 2021

In this paper, based on numerical simulation method, the rosin-rammler method was introduced to describe the non-uniqueness of particle diameter of abrasive water jet nozzle and the two-way coupling method was used to simulate the interaction between discrete phase and continuous phase. Through CFD simulation software, the influence of nozzle convergence angle, focus tube length on the outlet velocity of mixed-phase, and the relationship between abrasive flow rate and nozzle inner wall wear were obtained.
A wide-template and high-accuracy data transfer method for unstructured adjoint-based grid adaptation
Authors: Cui Pengcheng , Chen Jiangtao , Li Bin , Li Huan , Ma Mingsheng , Tang Jing
Published: August 2021

Grid adaptation is an important way to improve the identification of flow field and the accuracy of aerodynamic characteristics. Adjoint-based error estimation and grid adaptation method focuses on improving aerodynamic characteristics by optimizing local grids areas which are more sensitive to output functions. The data transfer between different meshes during the iteration of adjoint-based grid adaptation is the basis of accurate error estimation and grid adaptation. The traditional vertex-based method, however, is not suitable for cell-centred scheme finite volume method. A new wide-template and high-accuracy data transfer method for unstructured adjoint-based grid adaptation is proposed in this paper. Numerical results show that the proposed method is more accurate than traditional node-based method when transferring discontinuous flow field containing shock waves in cell-centred scheme finite volume method, and the accuracy of aerodynamic characteristics is obviously improved after grid adaptation.
Numerical Investigation of an Integrated Ejector Nozzle with the Nozzle Pressure Ratio of 2.97
Authors: Ge Changjie , Xiao Lianghua , Shang Yinhui
Published: August 2021

The design of the integrated ejector nozzle system directly affects the secondary mass flow rate and the trust characteristics of the aero-engine. The numerical simulation was used to study the effects of longitudinal distance between engine nozzle exit and aircraft surface and radius of ejector nozzle exit on the performance of the integrated ejector nozzle system. Results indicates:(1) As NPRs increases, secondary mass flow rate and thrust coefficient of ejector nozzle system generally increase;(2) the effect of D2/D0
is not obvious but D3/D0
has great effect, and the value of D3/D0
designed between 1.1 and 1.25, which is beneficial to the secondary mass flow rate and thrust coefficient of ejector nozzle system;(3) the combination design of D2/D0
and D3/D0
can restrain the flow separation between the primary flow and have inhibitory effect on the over-expansion of low nozzle pressure rate.
Experimental investigation on the flow-induced vibration of spatial bended section of heat exchanger tubes
Authors: Song Guangdong , Zhu Lina , Liu Mengmeng , Yu Huajin , Zhou Lijun , Gong Xiuyan
Published: August 2021

Flow induced vibrations in heat exchanger tubes have led to numerous accidents and economic losses in the past decades. The vibration characteristics of traditional heat tubes have been studied comprehensively through experiment, numerical simulations and theoretical analysis. Special tubes with spatial bended forms possess the great performance in nuclear engineering. The present work is motivated to understand the unclear flow-induced vibration features of these original heat exchanger tubes. An experimental system including of the tested objects are designed in water environment. The vibration responses and frequencies of spatial bended section of the heat exchanger tubes are tested and analysed. The results show that the spatial-bended tubes are safe enough to suffer the water flow within the velocity of 1m/s. The considerable vibration responses are in the bended areas with square configure, which should be specifically designed. The present work can be a guide for the special heat exchangers in nuclear engineering.
Research on wave motion response characteristics of a seaplane
Authors: Gao Xianjiao , Li Chenghua , Liu Tao , Wu Bin , Wang Mingzhen
Published: August 2021

As one of the criteria hydrodynamic qualities, sea-keeping performance is closely related with a seaplane’s security, comfortableness, durability. This paper is proposed to study the wave motion response characteristics of a seaplane based on wave model test. Firstly, similarity criterions, determination of test parameters, experiment equipment and data processing method are introduced. Then, based on test results, we analyse the influence of wave parameters, sliding velocity and deadweight on wave motion. It indicates that there is a positive relationship between wave height and motion response, while the acceleration decreases with the increase of wave length, and its peak value occur at the short wave length region of 0.5 to 1 times hull length of the seaplane, heave and pitch angle first increase then decrease with the change of wave length. The influence of sliding speed on heave and pitch angle depends on wave length, but the acceleration varies positive with change of velocity. The influence of heave and pitch angle has no obvious correlation with deadweight, while the acceleration shows a negative trend with change of deadweight. These regularity can be used to provide some reference for the analysis of wave motion response characteristics of seaplane.
Analysis of Piston Seal Performance of Pure Water Cylinder of Hydraulic Support
Authors: Zhou Xinjian , Shao Hongbin
Published: August 2021

Taking the piston seal of pure water hydraulic cylinder of hydraulic support as the research object, the sealing performance and damage characteristics are compared and analyzed for mountain seal and drum seal structures under different compressions and working medium pressures by the ANSYS Workbench. The two-dimensional axisymmetric models for the two structures are established. The compression deformation and stress of mountain seal ring and drum seal ring are simulated by setting different amount of compression and medium pressure. Findings showed that the most vulnerable area of the mountain seal ring is in the middle of the contact surface with the cylinder, and that of the drum seal ring is in its outer edge. The maximum contact stress of both the structured sealing rings increased with the increase of the medium pressure, and is always greater than the medium pressure, indicating good sealing performance. With the increase of compression and working medium pressure, the sealing performance of both kinds of rings decreased. When applied to the same piston, the sealing performance of mountain seal is better than that of drum seal under the same compression amount and medium pressure.
Experimental investigation of the heat transfer characterization of multiple microjet impingement cooler
Authors: Sun Jian , Du Haiquan , Zhou Peng , Zhang Renping , Alvarado Jorge
Published: August 2021

In this paper, a new type microjet with a return channel was designed and constructed from plastics using 3-Dimensional print techniques. The array of 12 microjets with diameter 3mm was tested using high pressure (17.3KPa-275.8 KPa) air as coolant for jet diameter Reynolds number from 1.5 × 103 -6.75 × 103. The effects of the design parameters such as standoff that is the distance of the nozzle exit to the heated surface were analyzed under different input power and Reynolds number. The pressure drop and COP of the cooler were explored under different conditions in the present study.
The Flow Instability Analysis for Steam Generator for China Experimental Fast Reactor (CEFR)
Authors: Zhu Lina , Wu Zhiguang , Yan Xiangyu
Published: August 2021

Steam generator plays an important role in nuclear power plant, especially in a fast reactor. As a barrier to separate the high temperature sodium and high pressure water/steam, it is important to make sure the safety of the steam generator. For this purpose, it is necessary to guarantee that there is no flow instability happened in the tubes of the steam generator. In order to ensure that the steam generator is stable in all conditions, this paper uses the method of Khabenskii to calculate the minimum inlet resistance coefficient to prevent flow instability in China Experimental Fast Reactor (CEFR) steam generator. The needed inlet resistance coefficient calculated is 1001.2. In addition, this paper analysis the effect of mass flow rate, pressure, subcooling and thermal power on flow instability in steam generator of CEFR. The result demonstrates that the increase of flow rate, pressure and subcooling and the decrease of thermal power will stabilize the flow instability in CEFR steam generator.
Numerical study of the liquid sloshing in the cylindrical tank with baffles
Authors: Duan Linlin , Liu Cenfan , Ji Fang , Yang Zhirong , Zhang Chongchong
Published: August 2021

Many kinds of dangerous chemicals, like liquefied natural gas etc., are stored or transported in liquid state by pressure vessel. Liquid sloshing will occur in many scenarios such as during the geological disasters, and the transit operations. Sloshing might lead to large deformation or even damage to containers, causing serious safety threats. In this study, the sloshing phenomenon in a cylindrical tank with four baffle shapes are investigated. The volume-of-fluid (VOF) method is used to track the distorted and broken free surface. Fluid movement phenomenon in tank with different baffles is observed. The effect of four different baffles shapes is compared, impacting force on tank and baffle walls which induced by liquid sloshing is analyzed. Baffles openings affect the impact forces on the tank and baffle walls. More number of baffle orifices, liquid distribution is more even in sections of the tank. Maximum force value of y direction occurs as the liquid climbs up the tank ceiling. Reasonable number and position of baffle openings can increase the stability of the tank during driving. For this simulation method, more validation with experimental data is necessary, the same size of tank and four baffle shapes will be tested on the shaking platform.
Experimental Validation on Active Vibration Reduction System for 2.4m×2.4m Transonic Wind Tunnel Model
Authors: Yang Xinghua , Lv Binbin , Yu Li , Kou Xiping , Zeng Kaichun
Published: August 2021

An active vibration reduction system has been developed to solve pitch vibration problems of the force test models in 2.4m × 2.4m transonic wind tunnel. The twin flexure hinges structure types and PD control algorithm are used in the system. The constitution of active vibration reduction system is presented. The results of Ground Tests and wind tunnel tests are given. The influence of the system on the static signal of the balance and its performance are discussed. The ground tests show that the system can increase the damping of the sting more than tenfold. It is shown that the vibration amplitude decreases by more than 70% in wind tunnel tests. The wind tunnel tests also reveal that the active vibration reduction system has relatively strong performance on the suppression of the model vibration.
Numerical simulation on filling process of drag reduction agent in natural gas pipeline
Authors: Yin Xiaoyun , Jing Jiaqiang , Jing Peiyu , Sun Jie , Yuan Ying
Published: August 2021

In this paper, a numerical simulation is established to model the filling process of atomized natural gas drag reduction agent (DRA) at the pipeline inlet section. The computations are on the basis of the Euler-Lagrange method with the standard k-ε turbulence model. The effects of atomizing parameters on the droplets Sauter Mean Diameter (SMD) and the adsorption performance on the wall of pipe are investigated using the validated model. The results show that nozzle diameter and nozzle angle have little effect on the SMD of DRA droplets, whereas the size of the droplets SMD reduces with the increase of atomizing pressure, and the influence of atomizing flow rate is just the opposite.
Finite element analysis of temperature field of nuclear fuel cladding tube
Authors: Shu Linghong , Dong Yunqiao
Published: August 2021

In this paper, the finite element software ANSYS is used to analyse the influence of the eccentricity of nuclear fuel pellet on the temperature field of the cladding tube. Furthermore, transient heat conduction analysis of a single fuel rod during a loss of coolant accident is carried out. It can be found that the pellet bias has little effect on the temperature difference between the inner and outer walls of cladding tube, but it has a great influence on the temperature of the pellet center. The results obtained by transient analysis show that the cladding tube will melt within 738 seconds in the loss of coolant accident.
Design of outlet pipeline diameter and flow rate of the variable head water flow standard facility based on CFD method
Authors: Li Haiyang , Zhang Liang , Xu Junlong , Chen Yuyang , Zhang Jinming
Published: August 2021

This paper introduces a method of designing the diameter and flow rate of the outlet pipeline of variable head water flow standard facility based on CFD method. And the procedures of geometric model design, mesh generation, parameter setting and numerical calculation are illustrated. Then it is concluded that the instability of the gas-liquid interface will not occur in the facility in the process of water falling, under the condition of the maximum design flow rate of 25000m3/h and the outlet pipeline of 3.0m diameter. Then it is also found that there is possibility of further expanding the diameter and flow rate of the standard facility. The numerical result has practical significance for the design and flow field analysis of the variable head water flow standard facility with diameter-change section in the main water tower.
Regression Analysis of the Heat Balance Thickness of a Blast Furnace Hearth Lining
Authors: Che Yuman , Wang Lei , Chen Liangyu
Published: August 2021

The reasonable structure and operation of a hearth can reduce the probability of serious depression and erosion of the lining of a blast furnace (BF). The temperature of the hearth lining is high inside and low outside. Theoretically, there is a heat balance state in the hearth. A three-dimensional computational fluid dynamics (CFD) calculation model that can simulate the theoretical heat balance state of the lining for different hearth design structures and operating parameters was established in this paper. Based on the calculation model, the response surface method was used to study the regression relationship between different factors and the thickness of the lining. In addition, the sensitivity of each factor to the thickness in a state of heat balance was evaluated. The analysis results showed that the blast furnace volume utilization factor and tapping temperature had a greater impact on the theoretical heat balance thickness of the hearth lining. These two factors had an obvious interaction. With the increase in the blast furnace volume utilization factor, the sensitivity of the heat balance thickness to the tapping temperature gradually decreased. The cooling water flow rate had a small effect on the heat balance thickness. The theoretical basis for the optimization of the hearth structure and the improvement of the operation method was provided in this paper.
Numerical simulation study on the volcanic gas reservoirs in block C of Xushen Gasfield
Authors: Geng Xiaoming
Published: August 2021

Block C of Xushen Field is one kind of the volcanic reservoirs with the bottom water. Since the development, the dynamic characteristics of the block are characterized by large differences in gas well productivity, formation water production, and low effective utilization of reserves. Using the dual-medium numerical model, through historical simulation and combination with gas well dynamic, the block pressure and, water body changes and remaining reserves distribution characteristics are clarified. The research shows that the remaining reserves of the block are mainly concentrated in the vicinity of xs901, xs903-p1 and the northwest periphery of xs902. With the increase of production allocation, the water production of six old wells such as XS9-7 increased rapidly and significantly, while the bottom water coning was obvious. Through six sets of gas production rate development plans with different magnification, consider whether the gas distribution can stabilize the output, water production, bottom hole flow pressure, and fluid accumulation. The optimal development plan of the old well in the block is determined comprehensively.
How pandemic and the industry 4.0 era constraint: the perspective of authentic leadership on innovation
Authors: Yunita Tyna , Prabowo Harjanto , Manurung Adler Haymans , Hamsa Mohammad
Published: August 2021

The COVID-19 crisis brought the importance of interdisciplinary knowledge to the forefront. Scholars carry out online communication and learning, instead of relying on face-to-face meetings at the conference, and are more proactive in disseminating their research online, which will achieve more success due to the higher number of readers citations. Remote work behaviour facilitated technology adoption in the era of industry 4.0 will affect company innovation. Then the authentic leaders who have the vision and views in industry 4.0 and are faced with pandemics will increase the level of innovation of these leaders. This research cannot be generalized to the industry in general but can be a reference for future researchers. 4.0 and corporate culture
Maximum deflection of three span continuous bridge using rotation data based on 3 dimensional model
Authors: Suangga M. , Haripriambodo T.
Published: August 2021

The Structural Health Monitoring System on the bridges continue to develop to ensure that the bridge being monitored is in good condition to serve traffic. One of the main bridge’s parameter observed is deflection of the bridge. Various methods has been developed to be able to monitor deflection accurately and economically. This study presents a method of determining the maximum deflection of a three-span continuous bridge using rotation data obtained from a tilt meter with linear regression. Initial data were obtained from FEM simulations under various load conditions to obtain the maximum deflection value and the rotations. Furthermore, linear regression was carried out to obtain the relationship between the four rotational data and the maximum deflection. The accuracy of the maximum deflection value is then compared with the results of the analysis using FEM. The accuracy rate obtained in this study is about 93.6%.
Development of Eco-Airport Model to Measure Environmental Noise Footprint in Supporting Airport Sustainability
Authors: Sardjono Wahyu , Kusnoputranto Haryoto , Soesilo Tri Edhi Budhi , Kristanto Gabriel A.
Published: August 2021

Among a set of tools to emerge in recent years in environmental management, one appears to meet the criteria necessary to bridge this gap is the environmental footprint analysis based on biophysical reality of sustainable living, people must use natural renewable products and services not sooner than they are replacedand produces no waste faster than nature can absorb. The purpose of this study is to develop a model of noise environment footprint toward sustainability airport with the environmental assessment at Soekarno-Hatta International Airport. The results showed that the airport ecological footprint of the model can be built through the factors analysis that can give an idea of the influence of ecoairport. The conclusion of this study is to obtain the noise ecological footprint provides a method for the total impact of air transport to be assessed, the ecological footprint can be used as a communication and awareness tool to inform communities about the impact they make. It can lead to shifts to public transport for airport access, ecological footprint can be used by airports and airlines to identify operations where energy efficiency measures can be made and where resource consumption can be reduced
Modeling existing buildings three-dimensional (3D) using unmanned aerial vehicles: A study case in Binus Syahdan Campus Building
Authors: Hidayat Irpan , Suwondo Riza , Suangga Made , Aufar Pahlevi Casey
Published: August 2021

Developments in the field of photogrammetric technology using UAV (Unmanned Aerial Vehicle) make it easier to represent mapping results quickly and accurately. Along with the growing need for spatial use, both horizontally and vertically, have implications for the need of accurate spatial data both in two-dimensional (2D) or three-dimensional (3D) space. 3D visualization and modeling is a representation of the surface of the earth with the aim of supplying the appearance of the earth along with the whole above it more realistic and able to provide a broader perspective compared to 2D visualization or conventional maps. In this study, the drone-based UAV was used, namely DJI Mavic Air to collect geometric data on the Syahdan campus. The digital data that has been recorded by the UAV is then processed into three-dimensional modeling using DroneDeploy software. DroneDeploy software is cloud-based and is generally used for aerial mapping, in this study it is used in making 3D modeling because of its efficient. The elevation data at each building point measured using a drone-based UAV are compared with the as-built drawing of the Syahdan Campus, Binus. The root mean square value of the comparison of elevation distance between 3D model and as built drawing is 0.47 meters.
Effects of Pile Configuration on The Behaviour of Jetty Structure Subject to Lateral Loads
Authors: Siagian Gerardo H.M. , Setyandito Oki , Suwondo Riza , John Pierre Andrew
Published: August 2021

Piles are structural elements which play an important role to carry loads and transfer them to the ground. In a jetty structure, the critical lateral loads supported by piles are mostly from Liquid Natural Gas (LNG) vessels. This research investigates various pile configuration such as pile diameter (40 cm, 60 cm, and 80 cm), distance between pile (2,5 m and 5 m), and the slope of the pile (straight pile and sloping pile with the ratio 1:8). A series of analysis has been conducted using SAP 2000 program. The analysis results show that a smaller pile deflection can be obtained if a large diameter pile is used, distance between piles is 2.5 m, and the type of piles being installed is a sloping pile.
Analysis of Earth Retaining Walls Reinforced by Metallic Strip or Geogrid
Authors: Suhendra A , Sutikno  , Lie J L , Mahardika I G
Published: August 2021

Earth retaining wall is a structure used for keeping and maintaining two different ground elevations. In application, sometime the earth retaining walls will combine with reinforcement element to increase the safety factor and any other reasons.Metallic strip and geogrid reinforcement which utilize friction between the fill material and reinforcement elements is one of the common applied. There are passive and active pressures in earth retaining wall analysis, whichare influenced bythe anchorage length. The analysis will compare the influence of passive pressure to its anchorage length. Moreover, the safety factor of the metallic strip and geogrid reinforcement will be compared with computer software. Since no specific element of metallic strip, the analysis will be conducted through an approach of geogrid and plate element. Passive force calculation on earth fill in the front of the retaining wall with a height of 12 m could shorten the anchorage length by 0.25% for 0.6 m depth; 0.38% for 0.7m depth; and 0.88% for 1.5 m depth. Hence, passive force does not have to be calculated as it gives a little difference in anchorage length compared to anchorage length calculation which ignores the passive force. Geogrid and plate elements used for modelling metallic strip in PLAXIS gives safety factor with a difference of 0.7%-3.4% and share similar landslide pattern. Therefore, metallic strip can be modelled using an approach of geogrid and plate element. The case study project shows the safety factor of geogrid and metallic strip reinforcement is minimum 1.2. However, geogrid reinforcement has 13.7%-31.4% higher safety factor compared to metallic strip.
Water Management Evaluation for Upgrading Tidal Irrigation System, Katingan, Kalimantan
Authors: Fauzan A Khomaini , Wignyosukarto Budi S , Jayadi Rachmad
Published: August 2021

Due to channel sedimentation, water deficits and flood still becomes problems in Katingan tidal irrigation system, while the stakeholder plans to reclaim new area in the presence of pyrite soil. This research aims to overcome these problems through four water management scenarios simulated using HEC-RAS to meet the needs of water supply, flushing and drainage. The result shows that water leaching requirement for existing area is 2.48 million m3 and could only be fulfilled by canal normalization. Moreover, extended network with narrow intake canal supplies less than 4.3 million m3 water leaching, so that wide canal connected to the river is required to facilitate more water flowing into the system. Related to flushing, installing pumps in the middle intake could increase canal circulation with one-way outflow during ebb tide, while the inflow depends on flap gates at the same position. Furthermore, the volume of rainwater is generally able to be discharged for every rainy day by all scenario designs. However, existing condition and network expansion with narrow intake canal have less rainwater deficit duration. In conclusion, leaching and drainage aspects require more water storage and wide canal intake, where flushing criterion need the use of pumps and gates.
Perception Analysis of Airport Noise on Environment, Sosial, and Economic at Halim Perdana Kusuma Airport
Authors: Sardjono Wahyu , Kusnoputranto Haryoto , Agrayanto Bagus Ferry , Soesilo Tri Edhi Budhi , Kristanto Gabriel A.
Published: August 2021

The increase in aircraft noise is an inevitable impact of Halim Perdanakusuma Airport (HLP) commercial operations since 2014. The perception of noise risk from people living around airports is a factor that must be considered for formulating strategic, comprehensive airport noise control plans and policies, and participatory. The purpose of this study is to analyze the noise conditions and the perception of environmental noise risk to the perception of socioeconomic risks that live around the HLP Airport. The results of the WECPNL calculation in area of Jaticempaka and Makasar was ranged between 73.80—79.72. The environmental noise risk of the community in HLP Airport’s vicinity was studied from knowledge aspects, perception aspects, and behavior aspects. Most of respondent were in the moderate category of environmental noise risk knowledge and environmental noise risk perception. While for environmental noise risk behavior aspects most respondent were in the low category. The social and economic risk perception for most respondent were in the moderate category. The conclusion of this research is that the community settlements in HLP Airport’s vicinity at the distance of 300 m and 600 m does not meet the environmental noise standard for a residential area which is regulated at 55 dB(A). The ideal area for settlement use in the vicinity of HLP Airport is Makassar area which is located 600 m from HLP Airport’s runway.
Selection of subcontractor vendor using analytic hierarchy process (AHP) method in construction company
Authors: Ariyanti Fransisca Dini , Putri Annatania Calista
Published: August 2021

Sub-contractor vendor is the one of the most important aspects for the construction company to finish the project. Failures in vendor selection could lead to severe impact of project on time, on quality and on budget. The selection of sub-contractor criteria is the initial stage in the decision-makingprocess by procurement. This research use multi criteria decision making, with Analytic Hierarchy Process method. Super Decision Software is used to help in obtaining weight and ranking values. The purpose of this research is to determine the criteria in selecting vendor and choosing the best sub-contractor vendor. Criteria in selecting subcontractors shall comply Indonesia’s Government law & policies which classify into six aspects, namely legal aspects, technical aspects, financial aspects, managerial aspects, safety aspects, and aspects of the vendor’s reputation. Based on company data, there are 3 candidates of sub-contractor vendors who will be selected in doing project work. The results showed that the priority on the criteria for safety aspects gained a weighting of 33.9%, the priority in the sub-criteria was coordination in the project with a weight of 63%, and the priority of the vendor which was vendor B with a weight of 36.7%.
Decision making in the warehouse expansion strategy at PT Dwitama Global Persada
Authors: Ariyanti Fransisca Dini , Raquel  , Velio Dylan
Published: August 2021

The increasing trend of online shopping has made the third party logistic company (PT Dwitama Global Persada) need to expand its capacity. This study aims to determine how much warehouse capacity should be increased based on demand forecasting, what alternatives can be applied to warehouse expansion, and how to make the decisions. There are two different options, namely renting a new warehouse or adding multi-tier mezzanine to the current warehouse floor. Decision making is achieved after calculating the demand forecast using the Holt method until April 2022, showing need to increase space capacity by 20%. Determination of annual costs based on service life and operational costs, followed by AWA annual worth analysis to compare the two options. The result showing that the multi-tiers floor option is more economical 12,6% compared to renting a new warehouse.
Determinants factor affecting user continuance usage and intention to recommend of mobile telemedicine
Authors: Hartono Ignasius Kurniawan , Della Tsania Kharisma , Kawi Yunisa Aprisari , Yuniarty
Published: August 2021

This study analysedmobile telemedicine application’s users in Jakarta towards their behaviours intention to recommend the applications to others. Using Unified Theory Acceptance and Use of Technology 2 (UTAUT2), Diffusion of Innovation, and Perceived Technology Security (PTS) would eventually explain their continuance usage and intention to recommend. This study targeted 384 respondents as samples and used random sampling to collect data using online questionnaires. The study used Structural Equation Modelling (SEM) Partial Least Square (PLS) with WarpPLS 7.0 for analysing data. Determinant factors that affect Mobile Telemedicine Application’s users’ behaviours will eventually help the health care workers and the application system providers to deliver a better patient centric, convenience and reliable applications especially during COVID-19 pandemic. This study revealed performance expectancy, price value, compatibility, and perceived technology security as significant factors influencing continuance usage, and continuance usage as a significant factor influencing intention to recommend mobile telemedicine.
The mindmapping for marketing strategy: Case study of fashion industry
Authors: Ratnapuri Chyntia Ika , Aprilia Selvi , Ningrum Dian Kurnia , Sudirman Ivan Diryana , Alamsyah Doni Purnama
Published: August 2021

The research objective is to build a marketing strategy based on mind mapping carried out in the fashion industry. The research was conducted by using the action research method on incubator business in University with the fashion business that has been start, while the qualitative analysis was based on a survey on mind mapping. The results of the study show that mind mapping can be a source of ideas for the formation of marketing strategies in the fashion industry, namely segmenting, targeting and positioning. The source of ideas in mind mapping makes it easier for entrepreneurs to create a value proposition canvas for the sustainability of the products created by the company. The research findings are especially useful in the fashion industry, where they serve as suggestions for implementing mind mapping for new or on-going companies with the goal of improving the company’s product.