The large-scale and sudden video content access such as flash crowds results in huge bandwidth demand,which severely influence user quality of experience and quality of service of video systems.In this paper,we firstl...The large-scale and sudden video content access such as flash crowds results in huge bandwidth demand,which severely influence user quality of experience and quality of service of video systems.In this paper,we firstly discuss the main reason of generation of flash crowds for video streaming services and analyze key factor for balance recovery between supply and demand of upload bandwidth.We construct two models:bandwidth supply capacity model of video systems and bandwidth demand model of users,which measures usage amount of bandwidth of the cloud.Based on the built models,we further employ a community-based cooperative caching strategy of video resources to promote supply capacity of upload bandwidth of video systems.Extensive tests show how the proposed cooperative caching strategy achieves much better performance results in comparison with original solution.展开更多
The increasing demand for mobile simulation tools has opened new possibilities in engineering applications,particularly in composite material modelling.This paper introduces original engineering software developed to ...The increasing demand for mobile simulation tools has opened new possibilities in engineering applications,particularly in composite material modelling.This paper introduces original engineering software developed to simulate composite materials on smartphones.The research explores the capabilities of mobile devices to perform simulations that are traditionally confined to desktop systems.Key challenges,such as computational limitations and the optimization of software architecture,now with integrated quantitative performance metrics such as computation time,accuracy,and memory efficiency,are addressed through the use of finite element analysis(FEA)and other advanced numerical methods.The software utilizes HTML-based coding for cross-platform accessibility,allowing engineers and researchers to conduct simulations anytime,anywhere.Strategies like parallel processing,cloud-assisted computation,and algorithmic optimization were implemented to enhance performance.The software’s real-time feedback and adaptive modelling provide accurate simulations of composite materials such as fiber-reinforced polymers.Furthermore,this paper reviews existing mobile-based simulation tools,highlighting their strengths and areas for improvement,while proposing novel solutions to increase efficiency,accuracy,and usability.The findings demonstrate that mobile devices,with optimized software,can successfully handle complex simulations,democratizing access to advanced engineering tools.展开更多
基金supported in part by the National Natural Science Foundation of China(NSFC) under Grant Nos.61501216,61402303,61522103the Science and Technology Plan Projects(Openness & Cooperation) of Henan province(152106000048)
文摘The large-scale and sudden video content access such as flash crowds results in huge bandwidth demand,which severely influence user quality of experience and quality of service of video systems.In this paper,we firstly discuss the main reason of generation of flash crowds for video streaming services and analyze key factor for balance recovery between supply and demand of upload bandwidth.We construct two models:bandwidth supply capacity model of video systems and bandwidth demand model of users,which measures usage amount of bandwidth of the cloud.Based on the built models,we further employ a community-based cooperative caching strategy of video resources to promote supply capacity of upload bandwidth of video systems.Extensive tests show how the proposed cooperative caching strategy achieves much better performance results in comparison with original solution.
文摘The increasing demand for mobile simulation tools has opened new possibilities in engineering applications,particularly in composite material modelling.This paper introduces original engineering software developed to simulate composite materials on smartphones.The research explores the capabilities of mobile devices to perform simulations that are traditionally confined to desktop systems.Key challenges,such as computational limitations and the optimization of software architecture,now with integrated quantitative performance metrics such as computation time,accuracy,and memory efficiency,are addressed through the use of finite element analysis(FEA)and other advanced numerical methods.The software utilizes HTML-based coding for cross-platform accessibility,allowing engineers and researchers to conduct simulations anytime,anywhere.Strategies like parallel processing,cloud-assisted computation,and algorithmic optimization were implemented to enhance performance.The software’s real-time feedback and adaptive modelling provide accurate simulations of composite materials such as fiber-reinforced polymers.Furthermore,this paper reviews existing mobile-based simulation tools,highlighting their strengths and areas for improvement,while proposing novel solutions to increase efficiency,accuracy,and usability.The findings demonstrate that mobile devices,with optimized software,can successfully handle complex simulations,democratizing access to advanced engineering tools.
