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RegisterService() and UnRegisterService() are the two methods de ned in the portType for service registration and unregistration. Noti cationSource/Noti cationSink portType The OGSA noti cation model allows interested parties to subscribe to service data elements and receive noti cation events when their values are modi ed. A Grid service that implements the Noti cationSource portType is called a noti cation source. A Grid service that implements the Noti cationSink portType is called a noti cation sink. To subscribe noti cation to a particular Grid service, a noti cation sink invokes a noti cation source using the SubscribeToNoti cationTopic() method in the Noti cationSource interface, giving it the service GSH of the noti cation sink and the topics interested. A noti cation source will use the DeliverNoti cation() method in the Noti cationSink interface to send a stream of noti cation messages to the sink, while the sink sends periodic messages to notify the source that it is still interested in receiving noti cations. To ensure reliable delivery, a user can implement this behaviour by de ning an appropriate protocol binding for the service. As shown in Figure 2.17, a Grid service must implement the GridService interface, and may implement other interfaces such as Factory, Registration, HandleResolver and Noti cationSource/

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Work breakdown structure (WBS) Diagram of how a team will accomplish the project at hand by listing all tasks the team will need to perform and the products they must deliver. Work function (factor) The difficulty in recovering the plaintext from the ciphertext as measured by cost and/or time. The security of the system is directly proportional to the value of the work function. The work function need only be large enough to suffice for the intended application. If the message to be protected loses its value after a short period of time, the work function need only be large enough to ensure that the decryption would be highly infeasible in that period of time. WPAN In Bluetooth, wireless personal area network.

LSF provides the following support for job management Job and job slot: An LSF job is a unit of work submitted for execution A job slot is a sink into which a single unit of work is assigned Hosts are con gured to have a number of job slots available and queues dispatch jobs to ll job slots Queue: A queue is a cluster-level container for Execution hosts Queues do not correspond to individual hosts; each queue can use all nodes in the cluster or a con gured subset of the nodes Queues implement different job scheduling and control policies LSF can have multiple queues LSF can automatically choose a suitable queue from a list of candidate default queues for a job submitted without specifying a queue name.

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cannot do without taxonomies, since it is in our nature as human beings to classify That is what a taxonomy is: a way of classifying or categorizing a set of things specifically, a classification in the form of a hierarchy A hierarchy is simply a treelike structure Like a tree, it has a root and branches Each branching point is called a node If you look up the definition of taxonomy in the dictionary, the definition will read something like the following (from Merriam-Webster OnLine: http:// wwwm-wcom/): The study of the general principles of scientific classification: SYSTEMATICS CLASSIFICATION; especially: orderly classification of plants and animals according to their presumed natural relationships So, the two key ideas for a taxonomy are that it is a classification and it is a tree But now let s be a bit more precise as to the information technology notion of a taxonomy.

Preemptive and preemptable queues: Jobs in a preemptive queue can preempt jobs in any queue of lower priority, even if the low-priority queues are not speci ed as preemptable Jobs in a preemptable queue can be preempted by jobs from any queue of a higher priority, even if the high-priority queues are not speci ed as preemptive Job types: LSF supports batch and interactive jobs, which can be sequential or parallel, using MPI or PVM Job deadline constraint: Deadline constraints will suspend or terminate running jobs at a certain time A deadline constraint can be speci ed at the queue level to suspend a running job, or can be speci ed at the job level to terminate a running job Job re-queue: LSF provides a way to automatically recover from temporary errors in executing jobs.

The rapid evolution of information technology has spawned terminology that s rooted in the dictionary definitions but defined slightly differently The concepts behind the terminology (and that thus constitute the definitions) are slightly different, because these concepts describe engineering products and are not just abstract or ordinary human natural language constructs Here is the information technology definition for a taxonomy: The classification of information entities in the form of a hierarchy, according to the presumed relationships of the real-world entities that they represent A taxonomy is usually depicted with the root of the taxonomy on top, as in Figure 71 Each node of the taxonomy including the root is an information entity that stands for a real-world entity.