دانلود کتاب PHP Web Services: APIs for the Modern Web

اختصاصی از فایلکو دانلود کتاب PHP Web Services: APIs for the Modern Web دانلود با لینک مستقیم و پر سرعت .

author: Lorna Jane Mitchell

year:2016

page:180

Resource Optimization and Security for Cloud Services, Wiley, 2014, کتاب

اختصاصی از فایلکو Resource Optimization and Security for Cloud Services, Wiley, 2014, کتاب دانلود با لینک مستقیم و پر سرعت .

Resource Optimization and Security for Cloud Services, Wiley, 2014

مطالب

Chapter 1. Introduction . . . . . . . . . . . . . . . . . . 1
1.1. Motivation . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2. The problems . . . . . . . . . . . . . . . . . . . . . . 4
1.3. Summary of contributions . . . . . . . . . . . . . . 9
1.4. The organization of this book . . . . . . . . . . . . 11
Chapter 2. Current Approaches for Resource
Optimization and Security . . . . . . . . . . . . . . . . 13
2.1. Service availability . . . . . . . . . . . . . . . . . . 14
2.2. Trustworthiness . . . . . . . . . . . . . . . . . . . . 16
2.3. Performance . . . . . . . . . . . . . . . . . . . . . . 18
2.4. The resource optimization problem subject
to an SLA . . . . . . . . . . . . . . . . . . . . . . . . 20
2.5. Public-key cryptography-based
authentication . . . . . . . . . . . . . . . . . . . . . 22
Chapter 3. Single Class Customers . . . . . . . . . . 27
3.1. The percentile of response time . . . . . . . . . . . 28
3.2. A resource optimization problem for service
models with single-class customers . . . . . . . . 29
3.3. Approaches for the resource optimization . . . . 31
vi Resource Optimization and Security for Cloud Services
3.4. Numerical validations . . . . . . . . . . . . . . . . 38
3.5. The balanced condition . . . . . . . . . . . . . . . . 43
3.6. Services Performance Modeling and Analysis
in a Simple Scenario of Cloud Computing . . . . 49
3.6.1. Overview . . . . . . . . . . . . . . . . . . . . . . 50
3.6.2. A computer service performance model . . . 54
3.6.3. A numerical validation . . . . . . . . . . . . . . 62
3.6.4. Discussions . . . . . . . . . . . . . . . . . . . . . 65
3.7. Concluding remarks . . . . . . . . . . . . . . . . . . 66
Chapter 4. Multiple-Class Customers . . . . . . . . . 69
4.1. The SLA performance metric in the case of
multiple class customers . . . . . . . . . . . . . . . 70
4.2. The resource optimization problem for multiple
customer services . . . . . . . . . . . . . . . . . . . 71
4.2.1. Resource optimization problem for multiple
class customers . . . . . . . . . . . . . . . . . . 72
4.3. Approaches for resource optimization . . . . . . 72
4.3.1. The LSTs of response time distributions for
two priority customers . . . . . . . . . . . . . . 72
4.3.2. Algorithms for the resource optimization
problem . . . . . . . . . . . . . . . . . . . . . . . 77
4.4. Numerical validations . . . . . . . . . . . . . . . . 86
4.5. Concluding remarks . . . . . . . . . . . . . . . . . . 93
Chapter 5. A Trustworthy Service Model . . . . . . 95
5.1. The trust-based resource optimization
problem . . . . . . . . . . . . . . . . . . . . . . . . . 96
5.2. A framework for solving the trust-based
resource provisioning problem . . . . . . . . . . . 99
5.3. The calculation of SLA metrics . . . . . . . . . . . 104
5.3.1. The trustworthiness of resource sites . . . . . 104
5.3.2. The percentile response time . . . . . . . . . . 108
5.3.3. The service availability . . . . . . . . . . . . . 110
5.4. An approach for solving the trust-based
resource provisioning problem . . . . . . . . . . . 111

5.4.1. Single-class customers . . . . . . . . . . . . . . 112
5.4.2. Multiple priority customers . . . . . . . . . . . 120
5.5. Numerical examples . . . . . . . . . . . . . . . . . 130
5.5.1. Single-class customers . . . . . . . . . . . . . . 130
5.5.2. Multiple priority customers . . . . . . . . . . . 134
5.6. Concluding remarks . . . . . . . . . . . . . . . . . . 138
Chapter 6. Performance Analysis of Public-Key
Cryptography-Based Group Authentication . . . . 141
6.1. Public-key cryptography-based
authentication . . . . . . . . . . . . . . . . . . . . . 142
6.2. PKCROSS and PKTAPP . . . . . . . . . . . . . . 144
6.2.1. Protocol analysis . . . . . . . . . . . . . . . . . 145
6.2.2. The calculation of the response time via
queuing networks . . . . . . . . . . . . . . . . . 150
6.3. A new group authentication technique using
public-key cryptography . . . . . . . . . . . . . . . 156
6.3.1. A single remote realm . . . . . . . . . . . . . . 156
6.3.2. Multiple remote realms . . . . . . . . . . . . . 161
6.4. Performance evaluation of the new
proposed technique . . . . . . . . . . . . . . . . . . 163
6.4.1. The operations of encryption
and decryption . . . . . . . . . . . . . . . . . . . 163
6.4.2. The calculation of the response
time via a queuing network . . . . . . . . . . . 167
6.4.3. Discussions . . . . . . . . . . . . . . . . . . . . . 170
6.5. Concluding remarks . . . . . . . . . . . . . . . . . . 171
Chapter 7. Summary and Future Work . . . . . . . . 173
7.1. Research summary of the book . . . . . . . . . . . 173
7.2. Future research directions . . . . . . . . . . . . . . 176
Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

اختصاصی از فایلکو Governing cloud computing services: Reconsideration of IT governance structures دانلود با لینک مستقیم و پر سرعت .

Governing cloud computing services: Reconsideration of IT governance structures

ژورنال:International Journal of Accounting Information Systems

سال:December 2015

قیمت اصلی:39.95$

Abstract

There is an increase in the uptake of cloud computing services (CCS). CCS is adopted in the form of a utility, and it incorporates business risks of the service providers and intermediaries. Thus, the adoption of CCS will change the risk profile of an organization. In this situation, organizations need to develop competencies by reconsidering their IT governance structures to achieve a desired level of IT-business alignment and maintain their risk appetite to source business value from CCS. We use the resource-based theories to suggest that collaborative board oversight of CCS, competencies relating to CCS information and financial management, and a CCS-related continuous audit program can contribute to business process performance improvements and overall firm performance. Using survey data, we find evidence of a positive association between these IT governance considerations and business process performance. We also find evidence of positive association between business process performance improvements and overall firm performance. The results suggest that the suggested considerations on IT governance structures can contribute to CCS-related IT-business alignment and lead to anticipated business value from CCS. This study provides guidance to organizations on competencies required to secure business value from CCS.

Keywords

• Cloud computing services, Organizational risk, Resourced-based theories, IT business alignment, Business process performance, Overall firm performance

اختصاصی از فایلکو Pricing strategy for cloud computing: A damaged services perspective دانلود با لینک مستقیم و پر سرعت .

Pricing strategy for cloud computing: A damaged services perspective

ژورنال:Decision Support Systems

سال:October 2015

قیمت اصلی:39.95$

Highlights

•

A hybrid strategy is shown to outperform a one-service-only strategy in most cases.

•

A hybrid strategy performs well especially when clients are sensitive to services interruptions or when task values are highly differentiated.

•

The presence of interruptions serves as a quality differentiator between the two types of services offered by the vendor, assuring the efficacy of the hybrid strategy.

•

The presence of interruptions also provides the vendor with resource reallocation flexibility.

•

If the vendor introduces a capacity limit in its contract, clients need to adopt a dynamic-threshold submission strategy to reserve limited computing resources for future high-value jobs.

•

The vendor is able to use the capacity limit as a tool, together with the hybrid strategy, to improve its profit.

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Abstract

How effective is a hybrid pricing strategy for a cloud computing services vendor that mixes fixed-price reserved services with spot-price on-demand services? This research offers a decision support model to create the appropriate strategy for IT services based on prior research on information goods, electricity pricing, product versioning, and revenue yield management. The goal is to establish whether interruptible spot-price on-demand cloud computing services — which we view as damaged services — are valuable to the vendor. The results from the analysis of an economic model show that a hybrid strategy outperforms a one-service-only strategy in most cases, especially when clients are sensitive to services interruptions or when task values are highly differentiated. A more intriguing finding is that a vendor should permit the possibility of services interruptions even when clients are highly sensitive to their occurrence. The presence of interruptions serves as a quality differentiator between the on-demand services and reserved services, assuring the efficacy of the hybrid strategy. Moreover, a vendor may use capacity limit, in the hybrid strategy, as a tool to further improve its profit. To our knowledge, this research is the first to propose the damaged services perspective as an analogy for damaged goods in the cloud software market.

Keywords

• Cloud computing, Damaged services, Pricing strategy, Services interruption, Spot prices