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IEEE International Conference on cloud computing, cloud

作者： Mohsen Amini Salehi P. Radha Krishna Krishnamurty Sai Deepak Rajkumar Buyya Cloud Computing and Distributed Systems (CLOUDS) Laboratory Department of Computing and Information Systems The University of Melbourne Australia Infosys Research Laboratories India

ISBN: (纸本)9781467328920

Energy efficiency is one of the main challenge hat data centers are facing nowadays. A considerable portion of the consumed energy in these environments is wasted because of idling resources. To avoid wastage, offering services with variety of SLAs (with different prices and priorities) is a common practice. The question we investigate in this research is how the energy consumption of a data center that offers various SLAs can be reduced. To answer this question we propose an adaptive energy management policy that employs virtual machine(VM) preemption to adjust the energy consumption based on user performance requirements. We have implementedour proposed energy management policy in Haize a as a real scheduling platform for virtualized data centers. Experimental results reveal 18% energy conservation (up to 4000 kWh in 30 days) comparing with other baseline policies without any major increase in SLA violation.

关键词： Switches Energy management Energy consumption Engines Equations Mathematical model Virtual machining

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Machine Learning in Energy and Thermal-aware Resource Management of cloud Data Centers: A Taxonomy and Future Directions

Machine Learning in Energy and Thermal-aware Resource Manage...

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Federated Conference on Computer Science and information systems (FedCSIS)

作者： Shashikant Ilager Rajkumar Buyya Cloud Computing and Distributed Systems (CLOUDS) Lab School of Computing and Information Systems University of Melbourne Australia Institute of Information Systems Engineering TU Wien Austria

ISBN: (数字)9788396960160

ISBN: (纸本)9798350359718

cloud data centres (CDCs) are the backbone infrastructures of modern digital society, but they also consume huge amounts of energy and generate heat. To manage CDC resources efficiently, we must consider the complex interactions between diverse workloads and data centre components. However, most existing resource management systems rely on simple and static rules that fail to capture these complex interactions. Therefore, we require new data-driven Machine learning-based resource management approaches that can efficiently capture the interdependencies between parameters and guide resource management systems. This review describes the in-depth analysis of the existing resource management approaches in CDCs for energy and thermal efficiency. It mainly focuses on learning-based resource management systems in data centres and also identifies the need for integrated computing and cooling systems management. A taxonomy on energy and thermal efficient resource management in data centres is proposed. Furthermore, based on this taxonomy, existing resource management approaches from server level, data centre level, and cooling system level are discussed. Finally, key future research directions for sustainable cloud computing services are proposed.

关键词： Data centers cloud computing Cooling Reviews Taxonomy Machine learning Thermal management Thermal analysis Resource management Servers

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Computational Offloading or Data Binding? Bridging the cloud Infrastructure to the Proximity of the Mobile User

Computational Offloading or Data Binding? Bridging the Cloud...

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IEEE International Conference on Mobile cloud computing, Services, and Engineering

作者： Huber Flores Satish Narayana Srirama Rajkumar Buyya University of Tartu Institute of Computer Science Mobile Cloud Lab University of Melbourne Department of Computing and Information Systems Cloud Computing and Distributed Systems Laboratory (CLOUDS)

ISBN: (纸本)9781479944248

Mobile and cloud computing are converging as the prominent technologies that are leading the change to the post personal computing (PC) era. Computational offloading and data binding are the core techniques that foster to elastically augment the capabilities of low-power devices, such as smartphones. Mobile applications may be bonded to cloud resources by following a task delegation or code offloading criteria. In a delegation model, a handset can utilize the cloud in a service-oriented manner to delegate asynchronously a resource-intensive mobile task by direct invocation of the service. In contrast, in an offloading model, a mobile application is partitioned and analyzed so that the most computational expensive operations at code level can be identified and offloaded to a remote cloud-based surrogate. We compared in this paper, the mobile cloud computing models for offloading and delegation. We utilized our own frameworks for computational offloading and data binding in the analysis. While in principle, offloading and delegation are viable methods to augment the capabilities of the mobile devices with cloud power, they enrich the mobile applications from different perspectives at diverse computational scales.

关键词： Mobile cloud computing Access Models Code Offloading Task Delegation Middleware Mobile Crowdsourcing

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Towards automatic update of access control policy 24

Towards automatic update of access control policy

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24th Large Installation System Administration Conference, LISA 2010

作者： Hu, Jinwei Zhang, Yan Li, Ruixuan Intelligent Systems Laboratory School of Computing and Mathematics University of Western Sydney Sydney1797 Australia Intelligent and Distributed Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan430074 China

Role-based access control (RBAC) has significantly simplified the management of users and permissions in computing systems. In dynamic environments, systems are subject to changes, so that the associated configurations need to be updated accordingly in order to reflect the systems' evolution. Access control update is complex, especially for large-scale systems;because the updated system is expected to meet necessary constraints. This paper presents a tool, RoleUpdater, which answers administrators' high-level update request for role-based access control systems. RoleUpdater is able to automatically check whether a required update is achievable and, if so, to construct a reference model. In light of this model, administrators could fulfill the changes to RBAC systems. RoleUpdater is able to cope with practical update requests, e.g., that include role hierarchies and administrative rules in effect. Moreover, RoleUpdater can also provide minimal update in the sense that no redundant changes are implemented. © LISA 2010.

关键词： Access control

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Progress in Advanced computing and Intelligent Engineering 1

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丛书名： Advances in Intelligent systems and computing

1000年

作者： Chhabi Rani Panigrahi Bibudhendu Pati Prasant Mohapatra Rajkumar Buyya Kuan-Ching Li

ISBN: (数字)9789811565847

ISBN: (纸本)9789811565830

This book features high-quality research papers presented at the 4th International Conference on Advanced computing and Intelligent Engineering (ICACIE 2019), Department of Computer Science, Rama Devi Women’s University, Bhubaneswar, Odisha, India. It includes sections describing technical advances and contemporary research in the fields of advanced computing and intelligent engineering, which are based on the presented articles. Intended for postgraduate students and researchers working in the discipline of computer science and engineering, the book also appeals to researchers in the domain of electronics as it covers hardware technologies and future communication technologies.

关键词： Signal, Image and Speech Processing Computational Intelligence Communications Engineering, Networks

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Metamaterial absorbers realized in an X-band rectangular waveguide

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Chinese Physics B 2012年第11期21卷 474-478页

作者：黄勇军文光俊李建钟靖平王平孙元华 O.Gordon 朱卫仁 Key Laboratory of Broadband Optical Fiber Transmission&Communication Networks School of Communication and Information EngineeringUniversity of Electronic Science and Technology of China Advanced Computing and Simulation Laboratory(AχL) Department of Electrical and Computer Systems EngineeringMonash University

In this paper, we demonstrate six types of metamaterial absorbers （MMAs） by measuring their absorptivities in an X-band （8 12 GHz） rectangular waveguide. Some of the MMAs have been demonstrated previously by using the free space measurement method, and the others are proposed firstly in this paper. The measured results show that all of the six MMAs exhibit high absorptivities above 98%, which have similar absorbing characteristics to those measured in the free space. The numerically obtained surface current densities for each MMA show that the absorbing mechanism is the same as that under the free space conditions. Such a demonstration method is superior to the conventional free space measurement method due to the small-scale test samples required, the simple measure device, and its low cost. Most importantly, the proposed method opens a way to enable MMAs to be used in microwave applications such as matched terminations.

关键词： metamaterial absorber electric resonator rectangular waveguide

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Real-time enhancement for Xen hypervisor

Real-time enhancement for Xen hypervisor

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International Workshop on Wireless Network Algorithm and Theory

作者： Yu, Peijie Xia, Mingyuan Lin, Qian Zhu, Min Gao, Shang Qi, Zhengwei Chen, Kai Guan, Haibing School of Software Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University China School of Electronic Information and Electrical Engineering Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University China

ISBN: (纸本)9780769543222

System virtualization, which provides good isolation, is now widely used in server consolidation. Meanwhile, one of the hot topics in this field is to extend virtualization for embedded systems. However, current popular virtualization platforms do not support real-time operating systems such as embedded Linux well because the platform is not real-time aware, which will bring low-performance I/O and high scheduling latency. The goal of this paper is to optimize the Xen virtualization platform to be real-time operating system friendly. We improve two aspects of the Xen virtualization platform. First, we improve the xen scheduler to manage the scheduling latency and response time of the real-time operating system. Second, we import multiple real-time operating systems balancing method. Our experiment demonstrates that our enhancement to the Xen virtualization platform support real-time operating system well and the improvement to the real-time performance is about 20%. © 2010 IEEE.

关键词： Virtualization

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Combining static and dynamic analysis to discover software vulnerabilities

Combining static and dynamic analysis to discover software v...

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2011 5th International Conference on Innovative Mobile and Internet Services in Ubiquitous computing, IMIS 2011

作者： Zhang, Ruoyu Huang, Shiqiu Qi, Zhengwei Guan, Haibin School of Software Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University China School of Electronic Information and Electrical Engineering Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University China

ISBN: (纸本)9780769543727

Dynamic taint analysis has been proved to be very effective in solving security problems recently, especially in software vulnerability detection and malicious behavior prevention. Unfortunately, most of current researches in this field focus on the runtime protection, and are incapable to discover the potential threat in the software. This paper describes a novel approach to overcome the limitation of traditional dynamic taint analysis by integrating static analysis into the system and presents framework SDCF. The framework translates the binary into assembly code and tracks the data flow. Then with static method, the system can get the important information which can't be gained at runtime, such as unexecuted part of the code. When this information is acquired, they will be provided to the client tools. The practicability of the framework is validated by implementing and evaluating a tool built on SDCF. The result of the experiments shows that our system is able to detect latent software vulnerabilities efficiently. © 2011 IEEE.

关键词： Static analysis

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Static program analysis assisted dynamic taint tracking for software vulnerability discovery

Static program analysis assisted dynamic taint tracking for ...

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作者： Zhang, Ruoyu Huang, Shiqiu Qi, Zhengwei Guan, Haibing School of Software Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University China School of Electronic Information and Electrical Engineering Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University China

The evolution of computer science has exposed us to the growing gravity of security problems and threats. Dynamic taint analysis is a prevalent approach to protect a program from malicious behaviors, but fails to provide any information about the code which is not executed. This paper describes a novel approach to overcome the limitation of traditional dynamic taint analysis by integrating static analysis into the system and presents framework SDCF to detect software vulnerabilities with high code coverage. Our experiments show that SDCF is not only able to provide efficient runtime protection by introducing an overhead of 4.16× based on the taint tracing technique, but is also capable of discovering latent software vulnerabilities which have not been exploited, and achieve code coverage of more than 90%. © 2011 Elsevier Ltd. All rights reserved.

关键词： Data flow analysis

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Towards a descriptive view of context usage in context-aware U-learning system

Towards a descriptive view of context usage in context-aware...

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21st International Conference on Computers in Education, ICCE 2013

作者： Souabni, Raoudha Saâdi, Inès Bayoudh Kinshuk, K. Ben Ghezala, Henda RIADI Research Laboratory - ENSI Manouba University Tunisia School of Computing and Information Systems Athabasca University Canada

ISBN: (纸本)9786028040723

Research in ubiquitous learning (U-learning) has gained attention of a large number of researchers and a number of ubiquitous learning systems are now available in the literature. Majority of these systems have been developed to resolve a specific problem in a given context;their development approaches do not dictate ubiquitous context usage requirements to fill in. U-learning systems developers need to have a clear and a general view of how their intended systems make use of the ubiquitous context. This paper introduces a comprehensive view of context usage through three different view-points inspired from Dowson's work (Dowson, 1993) each one capturing a particular aspect of context handling. Then a set of facets is associated to each given aspect in order to study, understand and appropriately describe it. The findings of this research are aimed to provide context-aware u-learning system developers a clear understanding of the context usage in such systems and help in underlining the requirements of the u-learning environment. This research is also aimed to help in comparing and evaluating context-aware u-learning systems according to the descriptive system views.

关键词： Learning systems

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