Environmental-aware virtual data center network

Cloud computing services have recently become a ubiquitous service delivery model, covering a wide range of applications from personal file sharing to being an enterprise data warehouse. Building green data center networks providing cloud computing services is an emerging trend in the Information and Communication Technology (ICT) industry, because of Global Warming and the potential GHG emissions resulting from cloud services. As one of the first worldwide initiatives provisioning ICT services entirely based on renewable energy such as solar, wind and hydroelectricity across Canada and around the world, the GreenStar Network (GSN) was developed to dynamically transport user services to be processed in data centers built in proximity to green energy sources, reducing Greenhouse Gas (GHG) emissions of ICT equipments. Regarding the current approach, which focuses mainly in reducing energy consumption at the micro-level through energy efficiency improvements, the overall energy consumption will eventually increase due to the growing demand from new services and users, resulting in an increase in GHG emissions. Based on the cooperation between Mantychore FP7 and the GSN, our approach is, therefore, much broader and more appropriate because it focuses on GHG emission reductions at the macro-level. This article presents some outcomes of our implementation of such a network model, which spans multiple green nodes in Canada, Europe and the USA. The network provides cloud computing services based on dynamic provision of network slices through relocation of virtual data centers.     

Cloud Computing Adoption Readiness and Benefit Realization in Irish SMEs—An Exploratory Study

This exploratory article tests the applicability of existing cloud computing adoption models, targeted primarily toward larger organizations, in supporting Irish small and medium-sized enterprises in transitioning to the cloud computing environment. Further, the article examines benefits realized from cloud adoption. Based on a quantitative research approach, the study’s findings indicate that existing cloud adoption frameworks are not suitable “as is” for the small- and medium-sized enterprise market. This provides strong justification for developing small- and medium-sized enterprise-specific frameworks for managing cloud migration.     

开源IaaS云服务软件平台的分析与比较

作为一种新兴的计算模式,云计算已经由最初的理论探索,逐渐进入了理论、技术与实际应用共同发展的阶段。开源云平台项目的研究与发展在其中起到了重要作用。迄今为止,使用开源IaaS云平台搭建自己的公共云或私有云,已经成为很多学术机构和商业企业信息管理、信息服务和技术研究中经济而有效的解决方案。为了评价和选择合适的IaaS云平台,根据NIST云模型,从体系结构、资源抽象和控制技术、云服务管理、安全策略、社区规模及活跃度和基本情况等多个方面 抽象出详细指标,对4个具有代表性的开源IaaS云平台软件进行了研究、分析和比较。     

基于TAM的企业云应用服务采纳模型及关键因素

云计算将主导企业应用的未来已成为业界的共识,转向云计算是企业应用模式的颠覆性变化。企业用户需要采纳适合企业自身需求的云计算方案,具备评估采纳云应用服务风险的能力;而服务提供商则应提供满足不同企业需求的云应用服务。采用技术接受模型(TAM)的相关理论建立云应用服务技术接受模型,并运用模糊决策实验与实验评估法(DEMATEL)对所设计模型及实例数据进行分析,检验所设计的云应用服务技术接受模型及关键因素。研究结果表明,感知有用性、应用服务质量、社交影响对企业用户采纳产生关键影响。     

云计算下西部地区中小企业信息服务系统的分析

首先,介绍了西部地区中小企业信息化现状分析、企业云计算的发展的需求与动因、云计算特征与分类、云服务模式,其次,阐述了西部地区中小企业云信息服务平台的分析,涉及云信息服务系统体系架构、云平台软硬件资源分析、云基础设施管理平台数据关联访问及促进西部地区中小企业云电子商务应用等.     

Estimating the impact of cloud computing on firm performance: An empirical investigation of listed firms

This study empirically investigates the economic impact of cloud service adoption on firm performance. We exploit the difference-in-differences models coupled with propensity score-based matching to estimate the performance effect of cloud computing on worldwide listed firms that adopted cloud service during 2010–2016. The results indicate that cloud computing has a significant and positive impact on the profitability and market value of listed firms with varying degrees in both short and long time periods. In addition, the magnitude of the performance effect varies with firm size and industry type. This research contributes to empirical examination on the economic values of IT investments.     

基于云计算模式的ERP企业管理信息系统分析

对于现代企业来讲,为了实现对企业信息的有效管理,提高企业管理效率,已经开始致力于建立企业内部的ERP管理信息系统。目前国内的大中型企业,很多已经建立了完善的ERP企业管理信息系统。考虑到企业规模的扩大以及企业管理数据的成倍增加,现有的ERP管理信息系统已经显示出一定的局限性。随着计算机技术的飞速发展,云计算的概念逐步得到了推广和应用。基于云计算的特点,ERP企业管理信息系统开始有意识的与云计算概念相结合。本文主要介绍了云计算模式的ERP企业管理信息系统特点和优势,对其应用效果进行了深入的分析。     

Market perception on cloud computing initiatives in organizations: An extended resource-based view

This study aims to investigate the economic value of cloud computing from the perspective of the stock market. More specifically, we conceptualize the relationship between the cloud computing initiatives of firms and the market reaction based on resource-based and extended resource-based views. For this study, we analyze 212 firm-level cloud computing announcements between 2006 and 2011 by employing the event study methodology. Our empirical results indicate that the market positively reacts to the cloud computing initiatives of firms. Moreover, the market reactions to cloud computing initiatives depend on three key characteristics of cloud computing, namely, firm-specific, resource-specific, and vendor-specific factors.     

Factors affecting the adoption of cloud services in enterprises

Cloud computing services offer enterprise clients many advantages such as reduced costs, easy maintenance and the easy re-provisioning of resources, thus contributing to increased profits. However, little is known about the adoption behavior of such services among enterprises. This study applies the technology–organization–environment framework to investigate determinants of cloud computing service adoption behavior. Data collected from 102 valid enterprises in Taiwan provide strong support for the model. Results indicate that technological (i.e., relative advantage, observability and security), organizational (i.e., financial costs and satisfaction with existing IS) and environmental (i.e., competition intensity) factors were positively related to intention to adopt cloud computing services, accounting for 52 % of variance. Implications and limitations are discussed.     

A study on effects of security risks on acceptance of enterprise cloud service: moderating of employment and non-employment using PLS multiple group analysis

This paper analyzed the effects of security risk factors fit for cloud computing paradigm on the acceptance of enterprise cloud service with intent to illuminate the factors for vitalizing the adoption of corporate cloud services in the future. The acceptance intention was set as a dependent variable. Independent variables were set in reference to the technology acceptance theory. Security risks were categorized into compliance risk, information leakage risk, troubleshooting risk and service discontinuation risk to design a model for analysis.     

Cloud computing for small research groups in computational science and engineering: current status and outlook

Cloud computing could offer good business models for small computational science and engineering (CSE) research groups because these groups often do not have enough human resources and knowledge to manage the complexity of computational and data infrastructure for their research, while cloud computing aims to eliminate that complexity from the user. In this paper, we have analyzed current status of supporting tools for small CSE groups to utilize cloud computing. Although cloud computing is perceived as an interesting model, we have identified several issues that prevent a wide adoption of cloud computing from small CSE research groups. We also present recommendations for addressing these issues in order to attract small CSE groups to utilize cloud computing.     

Perceived potential for value creation from cloud computing: a study of the Australian regional government sector

ABSTRACT

Cloud computing is gaining increasing interest as an enabling technology for improved productivity, efficiency and cost reduction. It also has the potential to add value to reliability and scalability of organisation’s systems, which would allow organisations to better focus on their core business and strategies. This research paper aimed at exploring the perceived potential for value creation from cloud computing in Australian Regional Governments. Using the Technology-Organization-Environment (TOE) framework, the Diffusion of Innovation (DOI) theory and Desires Framework (DF), a conceptual research model is devised. The key identified factors that are likely to influence adoption of cloud computing are identified along with the implications to current policies, anticipated benefits and challenges of adoption of cloud computing. The research employed a qualitative approach involving 21 in-depth interviews with Australian local councils’ IT managers. The findings of this research are mapped to the research model factors, thereby presenting and validating a number of value-adding concepts that are expected to contribute to investment decisions on cloud computing adoption.     

区块链即服务:下一个云服务前沿

区块链的本质是分布式账本.它作为比特币的底层技术日益被熟知,具有去中心化、开放性、自治性、信息不可篡改、匿名性的特点.区块链即服务(blockchain as a service)则是把区块链当作基础设施,并在其上搭建各种满足普通用户需求的应用,向用户提供服务.区块链即服务已成为云计算领域的研究重点.研究了区块链即服务最新的技术发展状况,结合行业研究和企业实践探索,对区块链即服务的架构以及各模块功能进行了概要设计说明,为区块链即服务的发展提供了通用架构模型.另外,分析了结合区块链即服务的云计算相关技术特点,并给出了可能的攻击模型.最后,结合行业区块链即服务的应用,对区块链即服务的技术前景进行了展望.     

Analysis of Critical Factors in Manufacturing by Adopting a Cloud Computing Service

The advantages of a cloud computing service are cost advantages, availability, scalability, flexibility, reduced time to market, and dynamic access to computing resources. Enterprises can improve the successful adoption rate of cloud computing services if they understand the critical factors. To find critical factors, this study first reviewed the literature and established a three-layer hierarchical factor table for adopting a cloud computing service based on the Technology-Organization-Environment framework. Then, a hybrid method that combines two multi-criteria decision-making tools—called the Fuzzy Analytic Network Process method and the concept of VlseKriterijumska Optimizacija I Kompromisno Resenje acceptable advantage—was used to objectively identify critical factors for the adoption of a cloud computing service, replacing the subjective decision of the authors. The results of this study determined five critical factors, namely data access security, information transmission security, senior management support, fallback cloud management, and employee acceptance. Finally, the paper presents the findings and implications of the study.     

Exploring users’ experiences of using personal cloud storage services: a phenomenological study

Recently, cloud computing has attracted great attention for both personal and organisational usages. Despite a large number of research conducted about cloud adoption, little is known about how users practically experienced the usage and adoption of Personal Could Storage Service (PCSSs) particularly in the context of developing countries. To address this gap, this paper seeks a clear understanding of how participants have profoundly experienced and perceived PCSSs to obtain worthwhile insights towards the essence of PCSSs’ adoption as a multifaceted phenomenon. Applying the interpretive phenomenology as a research method, required data were collected by conducting semi-structured interviews with 12 experienced participants. The results reveal that users’ intentions to adopt PCSSs are highly influenced by three emerged themes, including demand-side factors, supply-side factors, and institutional factors. Concerning the demand-side factors, the paper demonstrates how user-centric aspects work in favour of PCSSs’ adoption. As to the supply-side factors, this research promotes an understanding of how the participants have perceived tangible and non-tangible features of PCSSs as a determinant of the adoption. Regarding the formal and informal institutions, remarkable roles of regulatory environments and culture are highlighted, respectively. The theoretical and practical implications of this study are discussed for both academia and practitioners.     

基于动态能量感知的云计算任务调度模型

针对传统云计算任务调度模型出现的计算量大、能耗高、效率低、调配精度差等问题,基于动态能量感知设计了一种新的云计算任务调度模型;以动态能量感知为基础,选取资源分配服务器的中央处理器的使用率、存储器的占用率、控制器的负载率等3个参数,构建三维云计算任务节点投影空间,将上述参数向量投影到空间中;引入动态能量感知建立云计算任务调度模型,采用虚拟技术将多个服务器合并成一台服务器,对调度任务进行需求分析和分类,采用能量感知算法将待调度任务分配给满足调度需求的虚拟资源,将任务调度到服务器资源上,实现任务调度;实验结果表明,基于动态能量感知的云计算任务调度模型在从小任务集和大任务集两个角度都能给有效缩短调度时间,降低调度能耗。     

集团型企业云数据中心建设的阶段性研究

云计算是目前炙手可热的话题,其影响已渗入社会的方方面面。本文分析了云计算对企业的价值,企业实现云计算所需经历的阶段和工作重点,以及如何保障云计算的核心服务架构的实现。     

随机任务在云计算平台中能耗的优化管理方法

针对云计算系统在运行过程中由于计算节点空闲而产生大量空闲能耗,以及由于不匹配任务调度而产生大量“奢侈”能耗的能耗浪费问题,提出一种通过任务调度方式的能耗优化管理方法.首先,用排队模型对云计算系统进行建模,分析云计算系统的平均响应时间和平均功率,建立云计算系统的能耗模型.然后提出基于大服务强度和小执行能耗的任务调度策略,分别针对空闲能耗和“奢侈”能耗进行优化控制.基于该调度策略,设计满足性能约束的最小期望执行能耗调度算法ME3PC(minimum expectation execution energy with performance constraints).实验结果表明,该算法在保证执行性能的前提下,可大幅度降低云计算系统的能耗开销.     

基于云计算的信息管理系统的研究

随着云计算技术的飞速发展,云计算在管理信息系统中的发展中作用日益凸显。基于云计算的管理信息系统多数是基于SaaS技术构建的。本文针对大型餐饮企业业务复杂度高、IT软硬件基础薄弱和企业管理软件的实施难度较大这一现状,设计了基于云计算的餐饮管理信息系统,该系统具有高效、便捷、节能、安全、低成本等特点。     

Evaluating cloud deployment scenarios based on security and privacy requirements

Migrating organisational services, data and application on the Cloud is an important strategic decision for organisations due to the large number of benefits introduced by the usage of cloud computing, such as cost reduction and on-demand resources. Despite, however, many benefits, there are challenges and risks for cloud adaption related to (amongst others) data leakage, insecure APIs and shared technology vulnerabilities. These challenges need to be understood and analysed in the context of an organisation’s security and privacy goals and relevant cloud computing deployment models. Although the literature provides a large number of references to works that consider cloud computing security issues, no work has been provided, to our knowledge, which supports the elicitation of security and privacy requirements and the selection of an appropriate cloud deployment model based on such requirements. This work contributes towards this gap. In particular, we propose a requirements engineering framework to support the elicitation of security and privacy requirements and the selection of an appropriate deployment model based on the elicited requirements. Our framework provides a modelling language that builds on concepts from requirements, security, privacy and cloud engineering, and a systematic process. We use a real case study, based on the Greek National Gazette, to demonstrate the applicability of our work.