Electrical Electronics

Download Cyberinfrastructure Technologies and Applications by Junwei Cao PDF

By Junwei Cao

Cyberinfrastructure used to be proposed in a file of the NSF Blue-Ribbon advisory panel in 2003. Cyberinfrastructure will supply a unified surroundings to entry and deal with cyber assets, e.g. supercomputers, facts data, software program companies, clinical tools and digital organizations.In this booklet, the authors assessment most recent study and improvement and talk about new applied sciences and functions eager about construction Cyberinfrastructure. the aim of this ebook is to supply an in depth precis of early reviews, practices and classes leaned in construction Cyberinfrastructure from a number of views: software program improvement and upkeep, source integration and sharing, cyber atmosphere building, operation and administration, trying out and troubleshooting, software allowing, protection and QoS making sure. therefore, this ebook can function a necessary resource of reference and vital interpreting for researchers, educators, engineers, graduate scholars, and practitioners within the box of layout and implementation of Cyberinfrastructure platforms.

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SCHEDULING INTRUMENT SHARING This work focuses on scheduling remote access of scientific instruments with consideration of quality of service (QoS) issues. A layered model of instrument pools is introduced. In our previous work the role of human was not taken into account and there was no QoS feedback mechanism to reflect whether users are satisfied with experimental results. In this chapter the feedback information regarding instrument QoS is considered to be a fuzzy variable with one of the following linguistic values, terrible, bad, normal, good and excellent.

The scheduling model described in this work take users’ feedback information into account and try to satisfy user requirements better. Consider an instrument pool with N instruments in it, as shown in figure 3. Figure 3. Job scheduling in an instrument pool. 28 Jie Yin, Yuexuan Wang and Cheng Wu When a new experiment is submitted to an instrument pool, the probability that the experiment runs on each instrument is pi ( i ∈ [1, N ] ). It is obvious that the following equation holds: N ∑p i =1 i =1 (2) when an experiment is submitted to any chosen instrument, there are many factors which have influence on users’ appraisals, for example the cost of experiment this instrument charges for, the execution time and waiting time, whether the result from this instrument is reliable and whether the precision of the instrument can satisfy the experiment requirement.

If the experiment is submitted to the ith instrument in instrument pool, qi has the value as one of the following linguistic values, very bad, bad, normal, good and very good. In most cases, a qi with very good value has a large probability to receive excellent value of Q , good to good, normal to normal, bad to bad and very bad to terrible of Q. Because the value of q to a specific experiment is not known by instrument pool and can only be reflected by the user appraisal towards the total process of the experiment, the instrument pool will adjust pi to make the instrument with good or very good appraisal higher utilization ratio to satisfy users.

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