Research on Dynamic Virtualization Distributed Mobility Management Method for LEO Satellite Network by Hongtao ZHU, Qing GUO

“…With the commercialization of 5G,the integration of satellite communication and ground 5G has become a key research direction in the industry.Low earth orbit satellite network can cover the whole world and communicate with anyone at any time and anywhere.It is an eff ective supplement and expansion of terrestrial cellular network.Especially,the deployment of low earth orbit (LEO) internet constellation such as OneWeb and Starlink accelerates the development of LEO satellite network.However,due to the high dynamic of LEO satellite and the fast change of its network topology,the network management problem caused by it has become the diff culty of LEO satellite application,and mobility management is one of the key technologies.How to build a mobility management mechanism suitable for high dynamic LEO satellite network is an urgent problem to be solved.Based on the idea of ground distributed gateway and satellite agent cluster,the dynamic virtualization distributed mobility management (DV-DMM) model was proposed,which was mainly used to solve the problems of poor scalability and single point failure of traditional mobility management.At the same time,it used satellite to build virtual gateway to solve the problem of building satellite ground station on the ground.…”
Get full text

Comparative Analysis on Propagation Effects of Flight Delays: A Case Study of China Airlines by Weiwei Wu, Cheng-Lung Wu, Tao Feng, Haoyu Zhang, Shuping Qiu

“…Considering the possible effects of increased delays under air traffic control or airline factors, scenarios that adjust flight schedules with additional buffer time were created and analyzed. Results show that, by adding buffer time efficiently, flight schedules can become more reliable.…”
Get full text

Moderating effect of cultural differences on the association between social media use and mental health outcomes in adolescents: A cross-cultural comparison study. by Betul Keles Gordesli, Mary Leamy, Trevor Murrells, Annmarie Grealish

“…Horizontal and vertical individualism moderated the association between time spent on social media and depression in the entire sample. …”
Get full text

BeiDou satellites cross-regional communication path assignment model and resource management by Sheng Liu, Di Wu, Lanyong Zhang

“…Time division inter-satellite communication and ranging link assignment of BeiDou satellites have made important progress; however, there is still the unsolved issue of integrated communication between ground gateway, aircraft, or even ship, and the BeiDou satellites. …”
Get full text

Bolivia at a Crossroads: Is Consolidation of a ‘Divided Society’ Feasible? by T. A. Vorotnikova

“…The author shows how the regime of Evo Morales managed to reach an internal balance and maintain it for quite a long time through complex balancing, concessions, and compromises. …”
Get full text

Temporal and Spatial Distribution of Organic Matter in Sudden Water Pollution Accident of Dongzhuang Reservoir by HE Cuiling, GUO Ying, CAI Dandan, LIU Shaobin, LI Guodong

“…Dongzhuang Reservoir is a key project of the water resource allocation network in the Weibei area in central Shaanxi.There are many industrial enterprises distributed on both sides of the reservoir area.Once a sudden water pollution accident occurs,the safety of the reservoir's water quality will be seriously threatened.In view of the possible sudden water pollution accident in Dongzhuang Reservoir,this paper,based on the MIKE 11 hydrodynamic-ECO lab module,numerically simulates the diffusion of COD_Mn,an organic matter,after the sudden water pollution accident in Dongzhuang Reservoir.The results show that the upstream water inflow has an obvious effect on the temporal and spatial distribution law of pollutants,and the discharge flow and discharge time of pollutants have a slight influence on the pollution zone.The influence time and influence distance of the pollution zone are controlled by changing the upstream water inflow.The results can provide a reference for formulating emergency control strategies and schemes for sudden water pollution accidents in Dongzhuang Reservoir.…”
Get full text

Numerical simulation and industrial practice of inclusion removal from molten steel by gas bottom-blowing in continuous casting tundish by Meijie Z., Huazhi G., Ao H., Hongxi Z., Chengji D.

“…In this paper, the removal of small size inclusions in the gas bottom-blowing tundish was studied by numerical simulation and industrial practice. The residence time distribution (RTD) of molten steel in the tundish was calculated by mathematical modeling. …”
Get full text

Research on Attitude Measurement Method of Special Aircraft Using Geomagnetic Sensor/Gyroscope Based on UKF by Zhang Ping-an, Wang Wei, Gao Min, Wang Yi

“…Based on the output information of the three-axis geomagnetic sensor and three-axis gyroscope, a mathematical model for measuring the flight attitude information of special aircraft is established, and the flight attitude of the special aircraft is calculated in real time. To improve the accuracy of calculating the flight attitude of the special aircraft, the model of the pitch and yaw angles based on the Unscented Kalman filter (UKF) is established by using the output expression of the gyroscope and geomagnetic sensor x-axis, and then the pitch angle and yaw angle obtained by filtering are brought into the geomagnetic sensor to calculate the roll angle of special aircraft in real time. …”
Get full text

Blockchain-based digital copyright trading system by Li LI, Siqin ZHOU, Qin LIU, Debiao HE

“…In the current era of digitalization and networking,the demand for digital copyright transactions is increasing.The traditional centralized copyright protection system has series of problems such as high registration costs,long work acceptance times,and being vulnerable to tampering by saboteurs.Blockchain as a decentralized network structure and based on P2P network and cryptographic technology,which can establish trust relationship on the network by pure mathematics.Without relying on the middle platform,blockchain technology can naturally alleviate the above problems.With the help of self-regulatory,traceable and decentralized features of blockchain technology and digital copyright trading scenarios,a digital copyright trading system model was designed.The new system is based on the advanced permissioned blockchain provided by IBM.The implementation of copyright registration and copyright transaction can ensure the integrity and tamper-resistant of the information.Finally,the installation time of chain code deployment was tested.The results show that the system is simple to install and has low maintenance costs.Compared with the traditional trusted third party copyright authentication mechanism,the blockchain-based digital rights trading system has a short registration time,no registration fee,and better architecture security and scalability.…”
Get full text

Adapting physics-informed neural networks to improve ODE optimization in mosquito population dynamics. by Dinh Viet Cuong, Branislava Lalić, Mina Petrić, Nguyen Thanh Binh, Mark Roantree

“…The method offers a simple but effective way to resolve the time causality issue in PINNs by gradually expanding the training time domain until it covers entire domain of interest. …”
Get full text

Creep Mechanical Properties of Granite under Combined Axial Compression and Water Pressure and Support Characteristics of Surrounding Rock by Xiaolong Li, Chong Zhang, Jianhua He, Xingfu Deng

“…Based on rock mechanical properties, calculation and analysis of surrounding rock stability under different support time are carried out, and optimal support time is also discussed.…”
Get full text

Computational Reconstruction of the Volatility Term Structure in the General Hull–White Model by Slavi G. Georgiev, Lubin G. Vulkov

“…On the last time steps, before each maturity, the derivative price is decomposed in order to make the minimization problem analytically solvable. …”
Get full text

THE YOUNG LEARNERS’ PERCEPTION TOWARDS ENGLISH INSTRUCTIONAL PRACTICES USING VIRTUAL PLATFORMS by Purwanti Taman, Sukma Septian Nasution, Tommy Hastomo, Nur Najibah Sukmawati, Laksmy Ady Kusumoriny

“…Further studies are therefore suggested to delve into effective and feasible solutions to eradicate the negative perception because the best time to return to classroom-situated instructions remains arguable for no-exact time …”
Get full text

MARS: An Educational Environment for Multiagent Robot Simulations by Marco Casini, Andrea Garulli

“…Second, robotics simulators often require students to spend much time to learn their use and functionalities. For this purpose, a simulator of multiagent mobile robots named MARS has been developed within the Matlab environment, with the aim of helping students to simulate a wide variety of control algorithms in an easy way and without spending time for understanding a new language. …”
Get full text

A Critique on the Book Silent Cinema by Liam O’Leary, Paul A. Schroeder Rodriguez, translated by Majid Mostafavi by Hamed Fardar, Hamid Dehghanpour

“…It is also about the historical narratives that have been polished and expanded our understanding of the silent era over time. This book is a combination of two separate books by Liam Olieri and Paul Schroder Rodriguez, a concise, compelling narrative of those early years. …”
Get full text

Mortality Influenced Factors for Outcome of Epidural Hematoma Patient Which Performed Emergency Craniotomy in M Djamil Hospital Padang Periode January-December 2017 by Amrizal Amrizal, Syaiful Saanin

“…Whereas gender, initial GCS, pupil abnormality, onset trauma, delayed time are determinat factors that influence outcome but not significant.…”
Get full text

An Analysis of the Economic Impact of US Presidential Elections Based on Principal Component and Logical Regression by Jing-Jing Wang, Yan Liang, Jin-Tao Su, Jia-Ming Zhu

“…In order to investigate the impact of the US presidential election on the economy, this paper first constructs an analysis model of the economic impact on the United States based on stepwise regression and principal component analysis to analyze the focus of different candidates’ attention on the economic issues and its possible impact on the US economy in the election year and after the election; secondly, a Chinese economic impact analysis model based on factor analysis and machine learning logistic regression was constructed to analyze the impact of the US presidential election on the Chinese economy. At the same time, the future economic development of the United States and China based on the time series prediction model is forecast and analyzed, respectively. …”
Get full text

Survival and Mortality in Hospitalized Children with COVID-19: A Referral Center Experience in Yazd, Iran by Farimah Shamsi, Mehran Karimi, Zahra Nafei, Elahe Akbarian

“…This historical cohort study evaluated the survival time of hospitalized children (1 month–18 years old) with COVID-19 admitted from March 2020 to August 2021 to an educational hospital in Yazd, Iran. …”
Get full text

Human Gait Analysis Metric for Gait Retraining by Tyagi Ramakrishnan, Seok Hun Kim, Kyle B. Reed

“…The comparisons are made on gait data collected on individuals with stroke before and after twelve sessions of rehabilitation. Step length, step time, and swing time showed a strong correlation to CGAM, but the double limb support asymmetry has nearly no correlation with CGAM and ground reaction force asymmetry has a weak correlation. …”
Get full text

TVMS Calculation and Dynamic Analysis of Cracked Gear considering Oil Film Stiffness by Jiateng Wu, Zhenqi Du, Chengbiao Tong

“…A time-varying meshing stiffness (TVMS) model that includes oil film stiffness in the elastohydrodynamic lubrication (EHL) line contact is proposed for tooth root cracking. …”
Get full text