7 research outputs found
Grid Computing in Extreme Situations: Reducing Risk and Creating Resilience for IT-Infrastructures
Recent turbulences in financial markets are not only a challenge for the actors in the front offices of the related institutions, but also represent a serious challenge for the IT departments in the back offices of banks etc. We present a simulation model that shows how Grid computing increases the resilience and quality-of-service of IT infrastructure in departmentalized enterprises in the presence of shocks. Grid computing also reduces the costs deriving from the cancellation of jobs in times with a high volatility of computational load. The model can be used to find the appropriate type of IT infrastructure for different financial service institutions. Our simulations\u27 findings are also likely to encourage the introduction of Grid computing for related business branches and applications
Utility-based reputation model for VO in GRIDs
In this paper we extend the existing utility-based reputation model for VOs in Grids by incorporating a statistical model of user behaviour (SMUB) that was previously developed for computer networks and distributed systems, and different functions to address threats scenarios in the area of trust and reputation management. These modifications include: assigning initial reputation to a new entity in VO, capturing alliance between consumer and resource, time decay function, and score function.Π Π΄Π°Π½Π½ΠΎΠΉ ΡΡΠ°ΡΡΠ΅ ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π° ΠΌΠΎΠ΄ΠΈΡΠΈΠΊΠ°ΡΠΈΡ ΡΡΡΠ΅ΡΡΠ²ΡΡΡΠ΅ΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΡΠ΅ΠΏΡΡΠ°ΡΠΈΠΉ Π΄Π»Ρ Π²ΠΈΡΡΡΠ°Π»ΡΠ½ΡΡ
ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΉ Π² Grid-ΡΠΈΡΡΠ΅ΠΌΠ°Ρ
, ΠΊΠΎΡΠΎΡΠ°Ρ ΠΎΡΠ½ΠΎΠ²Π°Π½Π° Π½Π° ΠΎΡΠ΅Π½ΠΊΠ΅ ΡΡΠ½ΠΊΡΠΈΠΈ ΠΏΠΎΠ»Π΅Π·Π½ΠΎΡΡΠΈ. ΠΠΎΠ΄ΠΈΡΠΈΠΊΠ°ΡΠΈΡ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΡΠΎΡΡΠΎΠΈΡ Π² Π΄ΠΎΠ±Π°Π²Π»Π΅Π½ΠΈΠΈ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΏΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ ΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΠ΅Π»Ρ, ΠΊΠΎΡΠΎΡΠ°Ρ ΡΠ°Π½Π΅Π΅ Π±ΡΠ»Π° ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π° Π΄Π»Ρ ΠΊΠΎΠΌΠΏΡΡΡΠ΅ΡΠ½ΡΡ
ΡΠ΅ΡΠ΅ΠΉ ΠΈ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Π½ΡΡ
ΡΠΈΡΡΠ΅ΠΌ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΠΎΠ², ΠΊΠΎΡΠΎΡΡΠ΅ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡ ΠΏΡΠΎΡΠΈΠ²ΠΎΡΡΠΎΡΡΡ ΡΠ³ΡΠΎΠ·Π°ΠΌ Π² ΠΎΠ±Π»Π°ΡΡΠΈ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ Π΄ΠΎΠ²Π΅ΡΠΈΠ΅ΠΌ ΠΈ ΡΠ΅ΠΏΡΡΠ°ΡΠΈΠ΅ΠΉ. Π ΡΠΈΡΠ»Ρ ΡΡΠΈΡ
ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΠΎΠ² ΠΎΡΠ½ΠΎΡΡΡΡΡ: ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌ ΠΏΡΠΈΡΠ²ΠΎΠ΅Π½ΠΈΡ Π½Π°ΡΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ΅ΠΏΡΡΠ°ΡΠΈΠΈ Π΄Π»Ρ Π½ΠΎΠ²ΡΡ
ΡΡΠ±ΡΠ΅ΠΊΡΠΎΠ² Π²ΠΈΡΡΡΠ°Π»ΡΠ½ΠΎΠΉ ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΈ; ΡΡΠ΅Ρ Π²Π·Π°ΠΈΠΌΠΎΡΠ²ΡΠ·Π΅ΠΉ ΠΌΠ΅ΠΆΠ΄Ρ ΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΠ΅Π»ΡΠΌΠΈ ΠΈ ΡΠ΅ΡΡΡΡΠ°ΠΌΠΈ; ΡΡΠ½ΠΊΡΠΈΡ ΡΡΠ΅ΡΠ° Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ; Π° ΡΠ°ΠΊΠΆΠ΅ ΠΊΠ»Π°ΡΡΠΈΡΠΈΠΊΠ°ΡΠΈΡ ΠΏΡΠ΅Π΄ΠΎΡΡΠ°Π²Π»ΡΠ΅ΠΌΡΡ
ΡΠ΅ΡΠ²ΠΈΡΠΎΠ² Π² Grid-ΡΠΈΡΡΠ΅ΠΌΠ΅
Dual Constraint Problem Optimization Using A Natural Approach: Genetic Algorithm and Simulated Annealing
Constraint optimization problems with multiple constraints and a large solution domain are NP hard and span almost all industries in a variety of applications. One such application is the optimization of resource scheduling in a pay per use grid environment. Charging for these resources based on demand is often referred to as Utility Computing, where resource providers lease computing power with varying costs based on processing speed. Consumers using this resource have time and cost constraints associated with each job they submit. Determining the optimal way to divide the job among the available resources with regard to the time and cost constraints is tasked to the Grid Resource Broker (GRB). The GRB must use an optimization algorithm that returns an accurate result in a timely mam1er. The Genetic Algorithm and the Simulated Annealing algorithm can both be used to achieve this goal, although Simulated Annealing outperforms the Genetic Algorithm for use by the GRB. Determining optimal values for the variables used in each algorithm is often achieved through trial and error, and success depends upon the solution domain of the problem. Although this work outlines a specific grid resource allocation application, the results can be applied to any optimization problem based on dual constraints
Advances in Evolutionary Algorithms
With the recent trends towards massive data sets and significant computational power, combined with evolutionary algorithmic advances evolutionary computation is becoming much more relevant to practice. Aim of the book is to present recent improvements, innovative ideas and concepts in a part of a huge EA field
Uncertainty and uncertainty tolerance in service provisioning
PhDService, in general term is a type of economic activity where the consumers utilize
labour and/or expertise of others to perform a speciο¬c task. The birth and continued
growth of the Internet provide a new medium for services to be delivered, and enable
services to become widely and readily available. In recent years, the Internet has
become an important platform to provide services to the end users. Service provisioning,
In the context of computing, is the process of providing users with access to data
and technology resources. In a perfect operating environment, the entities involved
can expect the system will perform as intended or up to an accepted level of quality.
Unfortunately, disruptions or failures can occur which can aο¬ect the operation of the
service. Thus, the entities involved, in particular the service requester faces a situation
whereby the service requesterβs belief towards certain process in the service provisioning
life cycle is aο¬ected, i.e. deviates from the actual truth. This situation whereby the
service requesterβs belief is aο¬ected is referred as an uncertainty.
in this thesis, we discuss and explore the issue of uncertainty throughout the service
provisioning life cycle and provide a measure to tolerate uncertainty in service provisioning oο¬er through the application of subjective probability framework. This thesis
provides several key contributions to address the uncertainty issues in service provision-
Ing system in particular, for a service requester to overcome the negative consequence of
uncertainty. The key contributions are: (1) introduction to the issue of uncertainty in
service provisioning system, (2) a new classiο¬cation scheme for uncertainties in service
provisioning system, (3) a uniο¬ed view of uncertainty in service provisioning system
based on temporal classiο¬cation, which is linked to service requesterβs view, (4) a concept
of uncertainty tolerance for service provisioning, (5) an approach and framework
for automated uncertainty tolerance in service provisioning oο¬er.
The approach and framework for uncertainty tolerance in service provisioning oο¬er
presented in this thesis is evaluated through an empirical study. The result from the
study shows the viability of the approach and framework of the uncertainty tolerance
Mechanism through the application of subjective probability theory. The result also
shows the positive outcome of the mechanism in term of higher cumulative utility, and
better acceptance rate for the service requester.UNIMAS(Universiti Malaysia Sarawak)
Government of Malaysi
Quality of Service Aspects and Metrics in Grid Computing
Grid computing promises to become the future computing paradigm for enterprise application after having shown to be a quite e#ective computing paradigm for resource-intensive scientific applications. Large scale grids are complex systems, composed of a large number of components belonging to disjoint domains. Planning the capacity to guarantee quality of service (QoS) in these environments is a chal lenge because global Service Level Agreements (SLA) depend on local SLAs, i.e., SLAs established with components that make up the grid. These components are generally autonomous and join the grid as part of a loose federation. This paper investigates some of the relevant issues that must be considered in designing grid applications that deliver appropriate QoS: definition of metrics, relationship between resource allocation and SLAs, and QoS-related mechanisms