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"Smart Cafe": A Mobile Local Computing System Based On Indoor Virtual Cloud 被引量:2
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作者 PU Lingjun XU Jingdong YU Bowen ZHANG Jianzhong 《China Communications》 SCIE CSCD 2014年第4期38-49,共12页
With network developing and virtualization rising, more and more indoor environment (POIs) such as care, library, office, even bus and subway can provide plenty of bandwidth and computing resources. Meanwhile many p... With network developing and virtualization rising, more and more indoor environment (POIs) such as care, library, office, even bus and subway can provide plenty of bandwidth and computing resources. Meanwhile many people daily spending much time in them are still suffering from the mobile device with limited resources. This situation implies a novel local cloud computing paradigm in which mobile device can leverage nearby resources to facilitate task execution. In this paper, we implement a mobile local computing system based on indoor virtual cloud. This system mainly contains three key components: 1)As to application, we create a parser to generate the "method call and cost tree" and analyze it to identify resource- intensive methods. 2) As to mobile device, we design a self-learning execution controller to make offtoading decision at runtime. 3) As to cloud, we construct a social scheduling based application-isolation virtual cloud model. The evaluation results demonstrate that our system is effective and efficient by evaluating CPU- intensive calculation application, Memory- intensive image translation application and I/ O-intensive image downloading application. 展开更多
关键词 mobile local computing system application partition dynamic offloading strategy virtual cloud model social scheduling
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A Hybrid Virtual Cloud Learning Model during the COVID-19 Pandemic
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作者 Shaymaa E.Sorour Tamer M.Kamel Hanan E.Abdelkader 《Computers, Materials & Continua》 SCIE EI 2021年第3期2671-2689,共19页
The COVID-19 pandemic has affected the educational systems worldwide,leading to the near-total closures of schools,universities,and colleges.Universities need to adapt to changes to face this crisis without negatively... The COVID-19 pandemic has affected the educational systems worldwide,leading to the near-total closures of schools,universities,and colleges.Universities need to adapt to changes to face this crisis without negatively affecting students’performance.Accordingly,the purpose of this study is to identify and help solve to critical challenges and factors that influence the e-learning system for Computer Maintenance courses during the COVID-19 pandemic.The paper examines the effect of a hybrid modeling approach that uses Cloud Computing Services(CCS)and Virtual Reality(VR)in a Virtual Cloud Learning Environment(VCLE)system.The VCLE system provides students with various utilities and educational services such as presentation slides/text,data sharing,assignments,quizzes/tests,and chatrooms.In addition,learning through VR enables the students to simulate physical presence,and they respond well to VR environments that are closer to reality as they feel that they are an integral part of the environment.Also,the research presents a rubric assessment that the students can use to reflect on the skills they used during the course.The research findings offer useful suggestions for enabling students to become acquainted with the proposed system’s usage,especially during theCOVID-19 pandemic,and for improving student achievementmore than the traditional methods of learning. 展开更多
关键词 virtual cloud learning environment virtual reality environment rubric assessment COVID-19 critical challenges
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AVirtual Cloud Storage Architecture for Enhanced Data Security
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作者 M.Antony Joans Kumar C.Christopher Columbus +1 位作者 E.Ben George T.Ajith Bosco Raj 《Computer Systems Science & Engineering》 SCIE EI 2023年第2期1735-1747,共13页
The sensitive data stored in the public cloud by privileged users,such as corporate companies and government agencies are highly vulnerable in the hands of cloud providers and hackers.The proposed Virtual Cloud Storag... The sensitive data stored in the public cloud by privileged users,such as corporate companies and government agencies are highly vulnerable in the hands of cloud providers and hackers.The proposed Virtual Cloud Storage Archi-tecture is primarily concerned with data integrity and confidentiality,as well as availability.To provide confidentiality and availability,thefile to be stored in cloud storage should be encrypted using an auto-generated key and then encoded into distinct chunks.Hashing the encoded chunks ensured thefile integrity,and a newly proposed Circular Shift Chunk Allocation technique was used to determine the order of chunk storage.Thefile could be retrieved by performing the opera-tions in reverse.Using the regenerating code,the model could regenerate the missing and corrupted chunks from the cloud.The proposed architecture adds an extra layer of security while maintaining a reasonable response time and sto-rage capacity.Experimental results analysis show that the proposed model has been tested with storage space and response time for storage and retrieval.The VCSA model consumes 1.5x(150%)storage space.It was found that total storage required for the VCSA model is very low when compared with 2x Replication and completely satisfies the CIA model.The response time VCSA model was tested with different sizedfiles starting from 2 to 16 MB.The response time for storing and retrieving a 2 MBfile is 4.96 and 3.77 s respectively,and for a 16 MBfile,the response times are 11.06 s for storage and 5.6 s for retrieval. 展开更多
关键词 Erasure code regenerating code CRYPTOGRAPHY virtual cloud storage architecture circular shift chunk allocation algorithm
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Providing Virtual Cloud for Special Purposes on Demand in JointCloud Computing Environment 被引量:4
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作者 Dong-Gang Cao Member, CCF, IEEE, Bo An +1 位作者 Pei-Chang Shi Huai-Min Wang 《Journal of Computer Science & Technology》 SCIE EI CSCD 2017年第2期211-218,共8页
Cloud computing has been widely adopted by enterprises because of its on-demand and elastic resource usage paradigm. Currently most cloud applications are running on one single cloud. However, more and more applicatio... Cloud computing has been widely adopted by enterprises because of its on-demand and elastic resource usage paradigm. Currently most cloud applications are running on one single cloud. However, more and more applications demand to run across several clouds to satisfy the requirements like best cost efficiency, avoidance of vender lock-in, and geolocation sensitive service. JointCloud computing is a new research initiated by Chinese institutes to address the computing issues concerned with multiple clouds. In JointCloud, users' diverse and dynamic requirements on cloud resources axe satisfied by providing users virtual cloud (VC) for special purposes. A virtual cloud for special purposes is in essence a user's specific cloud working environment having the customized software stacks, configurations and computing resources readily available. This paper first introduces what is JointCloud computing and then describes the design rationales, motivation examples, mechanisms and enabling technologies of VC in JointCloud. 展开更多
关键词 cloud computing Jointcloud virtual cloud (VC) cloud working environment
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Energy-Performance Tradeoffs in laaS Cloud with Virtual Machine Scheduling 被引量:3
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作者 DONG Jiankang WANG Hongbo CHENG Shiduan 《China Communications》 SCIE CSCD 2015年第2期155-166,共12页
In the cloud data centers,how to map virtual machines(VMs) on physical machines(PMs) to reduce the energy consumption is becoming one of the major issues,and the existing VM scheduling schemes are mostly to reduce ene... In the cloud data centers,how to map virtual machines(VMs) on physical machines(PMs) to reduce the energy consumption is becoming one of the major issues,and the existing VM scheduling schemes are mostly to reduce energy consumption by optimizing the utilization of physical servers or network elements.However,the aggressive consolidation of these resources may lead to network performance degradation.In view of this,this paper proposes a two-stage VM scheduling scheme:(1) We propose a static VM placement scheme to minimize the number of activating PMs and network elements to reduce the energy consumption;(2) In the premise of minimizing the migration costs,we propose a dynamic VM migration scheme to minimize the maximum link utilization to improve the network performance.This scheme makes a tradeoff between energy efficiency and network performance.We design a new twostage heuristic algorithm for a solution,and the simulations show that our solution achieves good results. 展开更多
关键词 IaaS cloud virtual machine scheduling network performance energy efficiency
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Virtual resource monitoring in cloud computing 被引量:1
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作者 韩芳芳 彭俊杰 +4 位作者 张武 李青 李建敦 江钦龙 袁勤 《Journal of Shanghai University(English Edition)》 CAS 2011年第5期381-385,共5页
Cloud computing is a new computing model. The resource monitoring tools are immature compared to traditional distributed computing and grid computing. In order to better monitor the virtual resource in cloud computing... Cloud computing is a new computing model. The resource monitoring tools are immature compared to traditional distributed computing and grid computing. In order to better monitor the virtual resource in cloud computing, a periodically and event-driven push (PEP) monitoring model is proposed. Taking advantage of the push and event-driven mechanism, the model can provide comparatively adequate information about usage and status of the resources. It can simplify the communication between Master and Work Nodes without missing the important issues happened during the push interval. Besides, we develop "mon" to make up for the deficiency of Libvirt in monitoring of virtual CPU and memory. 展开更多
关键词 virtual resource monitoring cloud computing virtualIZATION
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A novel virtual machine deployment algorithm with energy efficiency in cloud computing 被引量:12
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作者 周舟 胡志刚 +1 位作者 宋铁 于俊洋 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第3期974-983,共10页
In order to improve the energy efficiency of large-scale data centers, a virtual machine(VM) deployment algorithm called three-threshold energy saving algorithm(TESA), which is based on the linear relation between the... In order to improve the energy efficiency of large-scale data centers, a virtual machine(VM) deployment algorithm called three-threshold energy saving algorithm(TESA), which is based on the linear relation between the energy consumption and(processor) resource utilization, is proposed. In TESA, according to load, hosts in data centers are divided into four classes, that is,host with light load, host with proper load, host with middle load and host with heavy load. By defining TESA, VMs on lightly loaded host or VMs on heavily loaded host are migrated to another host with proper load; VMs on properly loaded host or VMs on middling loaded host are kept constant. Then, based on the TESA, five kinds of VM selection policies(minimization of migrations policy based on TESA(MIMT), maximization of migrations policy based on TESA(MAMT), highest potential growth policy based on TESA(HPGT), lowest potential growth policy based on TESA(LPGT) and random choice policy based on TESA(RCT)) are presented, and MIMT is chosen as the representative policy through experimental comparison. Finally, five research directions are put forward on future energy management. The results of simulation indicate that, as compared with single threshold(ST) algorithm and minimization of migrations(MM) algorithm, MIMT significantly improves the energy efficiency in data centers. 展开更多
关键词 cloud computing energy efficiency three-threshold virtual machine(VM) selection policy energy management
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Multiway Dynamic Trust Chain Model on Virtual Machine for Cloud Computing 被引量:1
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作者 Jie Zhu Guoyuan Lin +2 位作者 Fucheng You Huaqun Liu Chunru Zhou 《China Communications》 SCIE CSCD 2016年第7期83-91,共9页
This paper sums up four security factors after analyzing co-residency threats caused by the special multitenant environment in the cloud.To secure the factors,a multiway dynamic trust chain transfer model was proposed... This paper sums up four security factors after analyzing co-residency threats caused by the special multitenant environment in the cloud.To secure the factors,a multiway dynamic trust chain transfer model was proposed on the basis of a measurement interactive virtual machine and current behavior to protect the integrity of the system.A trust chain construction module is designed in a virtual machine monitor.Through dynamic monitoring,it achieves the purpose of transferring integrity between virtual machine.A cloud system with a trust authentication function is implemented on the basis of the model,and its practicability is shown. 展开更多
关键词 cloud computing virtual machine trustworthiness measurement dynamic trust transfer
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Analyzing Security Threats to Virtual Machines Monitor in Cloud Computing Environment 被引量:1
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作者 Ahmad Fayez S. Althobaiti 《Journal of Information Security》 2017年第1期1-7,共7页
The data and applications in cloud computing reside in cyberspace, that allowing to users access data through any connection device, when you need to transfer information over the cloud, you will lose control of it. T... The data and applications in cloud computing reside in cyberspace, that allowing to users access data through any connection device, when you need to transfer information over the cloud, you will lose control of it. There are multi types of security challenge must be understood and countermeasures. One of the major security challenges is resources of the cloud computing infrastructures are provided as services over the Internet, and entire data in the cloud computing are reside over network resources, that enables the data to be access through VMs. In this work, we describe security techniques for securing a VCCI, VMMs such as Encryption and Key Management (EKM), Access Control Mechanisms (ACMs), Virtual Trusted Platform Module (vTPM), Virtual Firewall (VF), and Trusted Virtual Domains (TVDs). In this paper we focus on security of virtual resources in Virtualized Cloud Computing Infrastructure (VCCI), Virtual Machine Monitor (VMM) by describing types of attacks on VCCI, and vulnerabilities of VMMs and we describe the techniques for securing a VCCI. 展开更多
关键词 cloud COMPUTING SECURITY Threats virtual Machine MONITORS cloud SECURITY
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Energy-Efficient Framework for Virtual Machine Consolidation in Cloud Data Centers 被引量:1
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作者 Kejing He Zhibo Li +1 位作者 Dongyan Deng Yanhua Chen 《China Communications》 SCIE CSCD 2017年第10期192-201,共10页
With the advent of the era of cloud computing, the high energy consumption of cloud computing data centers has become a prominent problem, and how to reduce the energy consumption of cloud computing data center and im... With the advent of the era of cloud computing, the high energy consumption of cloud computing data centers has become a prominent problem, and how to reduce the energy consumption of cloud computing data center and improve the efficiency of data center has become the research focus of researchers all the world. In a cloud environment, virtual machine consolidation(VMC) is an effective strategy that can improve the energy efficiency. However, at the same time, in the process of virtual machine consolidation, we need to deal with the tradeoff between energy consumption and excellent service performance to meet service level agreement(SLA). In this paper, we propose a new virtual machine consolidation framework for achieving better energy efficiency-Improved Underloaded Decision(IUD) algorithm and Minimum Average Utilization Difference(MAUD) algorithm. Finally, based on real workload data on Planet Lab, experiments have been done with the cloud simulation platform Cloud Sim. The experimental result shows that the proposed algorithm can reduce the energy consumption and SLA violation of data centers compared with existing algorithms, improving the energy efficiency of data centers. 展开更多
关键词 cloud computing virtual machine consolidation energy efficiency virtual machine migration
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The Application of Cloud Computing in Virtual Enterprise’s Information Resources Sharing 被引量:1
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作者 Wei Wang Guan-Quan Liu Qiu Zhang 《Journal of Software Engineering and Applications》 2013年第3期48-50,共3页
With the rapid development of social,science and technology ,we are always looking for the advanced and rapid manufacturing method and the management pattern.thus a new enterprise cooperation pattern-Virtual Enterpris... With the rapid development of social,science and technology ,we are always looking for the advanced and rapid manufacturing method and the management pattern.thus a new enterprise cooperation pattern-Virtual Enterprise arises at the historic moment. The cooperation is a process which advantages the temporary enterprise resources each other. Therefore, the virtual enterprise must encounter the problem that how to realize the virtual enterprises’ information resources sharing and improve the efficiency of enterprise cooperation. This paper uses the cloud computing’s advantage to solve the problem of virtual enterprise information resources sharing. Then enterprise is able to share the information of different regions,different computing environment and improve the efficiency of virtual enterprise cooperation. 展开更多
关键词 cloud COMPUTING virtual ENTERPRISE INFORMATION SHARING
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Safety Protection Design of Virtual Machine Drift Flow in Cloud Data Center Based on VXLAN Technology 被引量:1
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作者 Heping Pu Yijun Wang Xinke An 《Journal of Computer and Communications》 2020年第8期45-58,共14页
Based on the analysis of the security problems existing in the cloud platform of the data center, this paper proposes a set of cloud platform security protection scheme being with virtualization technology. This paper... Based on the analysis of the security problems existing in the cloud platform of the data center, this paper proposes a set of cloud platform security protection scheme being with virtualization technology. This paper focuses on the overall architecture of cloud platform as well as the design of virtualization security architecture. Meantime, it introduces the key technologies of VXLAN in detail. The scheme realizes flexible scheduling of security resources through virtual pooling of independent security gateway and virtual machine isolation through VXLAN technology. Moreover, it guides all horizontal traffic to independent security gateway for processing, unified management of security gateway through cloud platform by using Huawei NSH business chain technology. This scheme effectively solves the horizontal transmission of security threat among virtual machines, and realizes the fine security control and protection for the campus data center. 展开更多
关键词 Network Security cloud Platform virtualization Technology VXLAN Horizontal Traffic
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Enhancing the Performance of Current Online Education System—A Study of Cloud Computing and Virtualization
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作者 Basheer Riskhan Raza Muhammed 《Journal of Computer and Communications》 2015年第10期43-51,共9页
Online Education (OE) system is an effective and efficient way to perform the education in all sectors of government and non-government educational organization. Low performance and minimum speed are major overhead in... Online Education (OE) system is an effective and efficient way to perform the education in all sectors of government and non-government educational organization. Low performance and minimum speed are major overhead in the current ongoing OE system due to the increase of users and some system issues. Base on the previous study and recent practical issues, a model is proposed to Enhancing the Performance of Online Education System (EPOES) to examine the bare metal virtualization, isolation and virtual machine templates. Bare metal virtualization has led the native execution, isolation isolated the running application and Virtual Machine Template has help to increase efficiency, avoiding the repetitive installation and operate the server in less time. The proposed model boosts the performance of the current OE system, and examines the benefits of the adaptation of cloud computing and virtualization which can be used to overcome the existing challenges and barriers of the current OE System. 展开更多
关键词 BARE Metal virtualIZATION cloud Computing ISOLATION virtual Machine TEMPLATE
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Task scheduling and virtual machine allocation policy in cloud computing environment 被引量:3
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作者 Xiong Fu Yeliang Cang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第4期847-856,共10页
Cloud computing represents a novel computing model in the contemporary technology world. In a cloud system, the com- puting power of virtual machines (VMs) and network status can greatly affect the completion time o... Cloud computing represents a novel computing model in the contemporary technology world. In a cloud system, the com- puting power of virtual machines (VMs) and network status can greatly affect the completion time of data intensive tasks. How- ever, most of the current resource allocation policies focus only on network conditions and physical hosts. And the computing power of VMs is largely ignored. This paper proposes a comprehensive resource allocation policy which consists of a data intensive task scheduling algorithm that takes account of computing power of VMs and a VM allocation policy that considers bandwidth between storage nodes and hosts. The VM allocation policy includes VM placement and VM migration algorithms. Related simulations show that the proposed algorithms can greatly reduce the task comple- tion time and keep good load balance of physical hosts at the same time. 展开更多
关键词 cloud computing resource allocation task scheduling virtual machine (VM) allocation.
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A Cloud-Based Virtualized Execution Environment for Mobile Applications 被引量:1
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作者 Shih-Hao Hung Chi-Sheng Shih +1 位作者 Jeng-Peng Shieh Chen-Pang Lee 《ZTE Communications》 2011年第1期15-21,共7页
Smartphones and cloud computing technologies have enabled the development of sophisticated mobile applications. Still, many of these applications do not perform well due to limited computation, data storage, network b... Smartphones and cloud computing technologies have enabled the development of sophisticated mobile applications. Still, many of these applications do not perform well due to limited computation, data storage, network bandwidth, and battery capacity in a mobile phone. While applications can be redesigned with client-server models to benefit from cloud services, users are no longer in full control of the application. This is also a serious concern. We propose an innovative framework for executing mobile applications in a virfualized cloud environment. With encryption and isolation, this environment is controlled by the user and protected against eavesdropping from cloud providers. We have developed efficient schemes for migrating applications and synchronizing data between execution environments. Performance and power issues within a virtualized execution environment are also addressed using power saving and scheduling techniques that enable automatic, seamless application migration. 展开更多
关键词 SMARTPHONE cloud computing mobile network virtualIZATION collaborative computing ENERGY-SAVING SCHEDULING
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Heuristic Virtual Machine Allocation for Multi-Tier Ambient Assisted Living Applications in a Cloud Data Center
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作者 Jing Bi Haitao Yuan +1 位作者 Ming Tie Xiao Song 《China Communications》 SCIE CSCD 2016年第5期56-65,共10页
Cloud computing provides the essential infrastructure for multi-tier Ambient Assisted Living(AAL) applications that facilitate people's lives. Resource provisioning is a critically important problem for AAL applic... Cloud computing provides the essential infrastructure for multi-tier Ambient Assisted Living(AAL) applications that facilitate people's lives. Resource provisioning is a critically important problem for AAL applications in cloud data centers(CDCs). This paper focuses on modeling and analysis of multi-tier AAL applications, and aims to optimize resource provisioning while meeting requests' response time constraint. This paper models a multi-tier AAL application as a hybrid multi-tier queueing model consisting of an M/M/c queueing model and multiple M/M/1 queueing models. Then, virtual machine(VM) allocation is formulated as a constrained optimization problem in a CDC, and is further solved with the proposed heuristic VM allocation algorithm(HVMA). The results demonstrate that the proposed model and algorithm can effectively achieve dynamic resource provisioning while meeting the performance constraint. 展开更多
关键词 ambient assisted living cloud computing resource provisioning virtual machine heuristic optimization
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Energy-efficient virtual machine consolidation algorithm in cloud data centers 被引量:3
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作者 ZHOU Zhou HU Zhi-gang YU Jun-yang 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第10期2331-2341,共11页
Cloud data centers consume a multitude of power leading to the problem of high energy consumption. In order to solve this problem, an energy-efficient virtual machine(VM) consolidation algorithm named PVDE(prediction-... Cloud data centers consume a multitude of power leading to the problem of high energy consumption. In order to solve this problem, an energy-efficient virtual machine(VM) consolidation algorithm named PVDE(prediction-based VM deployment algorithm for energy efficiency) is presented. The proposed algorithm uses linear weighted method to predict the load of a host and classifies the hosts in the data center, based on the predicted host load, into four classes for the purpose of VMs migration. We also propose four types of VM selection algorithms for the purpose of determining potential VMs to be migrated. We performed extensive performance analysis of the proposed algorithms. Experimental results show that, in contrast to other energy-saving algorithms, the algorithm proposed in this work significantly reduces the energy consumption and maintains low service level agreement(SLA) violations. 展开更多
关键词 cloud computing energy consumption linear weighted method virtual MACHINE CONSOLIDATION virtual MACHINE selection ALGORITHM
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Lightweight Virtualization Cluster How to Overcome Cloud Vendor Lock-In
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作者 Nane Kratzke 《Journal of Computer and Communications》 2014年第12期1-7,共7页
To overcome vendor lock-in obstacles in public cloud computing, the capability to define transferable cloud-based services is crucial but has not yet been solved satisfactorily. This is especially true for small and m... To overcome vendor lock-in obstacles in public cloud computing, the capability to define transferable cloud-based services is crucial but has not yet been solved satisfactorily. This is especially true for small and medium sized enterprises being typically not able to operate a vast staff of cloud service and IT experts. Actual state of the art cloud service design does not systematically deal with how to define, deploy and operate cross-platform capable cloud services. This is mainly due to inherent complexity of the field and differences in details between a plenty of existing public and private cloud infrastructures. One way to handle this complexity is to restrict cloud service design to a common subset of commodity features provided by existing public and private cloud infrastructures. Nevertheless these restrictions raise new service design questions and have to be answered in ongoing research in a pragmatic manner regarding the limited IT-operation capabilities of small and medium sized enterprises. By simplifying and harmonizing the use of cloud infrastructures using lightweight virtualization approaches, the transfer of cloud deployments between a variety of cloud service providers will become possible. This article will discuss several aspects like high availability, secure communication, elastic service design, transferability of services and formal descriptions of service deployments which have to be addressed and are investigated by our ongoing research. 展开更多
关键词 cloud Computing VENDOR LOCK-IN CROSS-PLATFORM LIGHTWEIGHT virtualIZATION Container
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高职院校应用电子技术专业人才培养转型与教学改革
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作者 张莉 朱文武 +2 位作者 黄金霖 伍永健 汪志红 《科技风》 2025年第1期55-57,共3页
高职院校人才培养工作目前存在着教学模式单一、学生学习目标盲目、学习过程评价体系缺失等问题,教师面临教学模式和教学关系变革的巨大挑战。本文采用线上线下混合式教学模式将传统教学与网络教学有机结合,校企共同确定“知岗位、熟设... 高职院校人才培养工作目前存在着教学模式单一、学生学习目标盲目、学习过程评价体系缺失等问题,教师面临教学模式和教学关系变革的巨大挑战。本文采用线上线下混合式教学模式将传统教学与网络教学有机结合,校企共同确定“知岗位、熟设备、明原理、析工艺”的三维教学目标。创新理虚实一体化的PTCA教学策略,探索混合式教学在探索实践中完成了“三转”教学改革。探寻应用电子技术专业培养工作创新发展路径,以实现人才培养工作满足新时代经济社会发展需要的目标。 展开更多
关键词 PTCA教学策略 虚实结合 智慧课堂 立体化云教材
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基于CloudStack的私有云平台的构建与实现 被引量:11
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作者 吴常清 王慧敏 薛涛 《西安工程大学学报》 CAS 2014年第2期220-224,共5页
为解决企业数据中心不断扩张,资源利用率降低的问题,在研究虚拟化技术的基础上构建基于ColudStack的企业私有平台.私有云将计算、存储、网络等资源虚拟化后,提高了数据中心资源利用率,节约了用电成本.
关键词 私有云 虚拟化 cloudStack 资源利用率
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