Shanthikumar [10] studied the priority M/G/1 queue with server vacations and found that the difference between the waiting time distribution under the non-preemptive priority and that under the preemptive-resume priority is independent of the vacation policy. We extend this interesting property i) to the generalized vacations which includes the two vacation policies considered by Shanthikumar, ...

Priority trees are a certain data structure used for priority queue administration. Under the model that all permutations of the numbers 1, . . . , n are equally likely to construct a priority tree of size n we study the following parameters in size-n trees: depth of a random node, number of right edges to a random node, and number of descendants of a random node. For all parameters studied we ...

investigation of desertification trend requires an understanding of phenomena that create changes singly or action and reaction together in an area that these changes were led to the desertification and land degradation. in the investigation of pedological criterion affecting on land degradation in alluvial fans, first, the map of units was created by overlaying and crossing maps of slope class...

pedological criterion affecting desertification in alluvial fans was investigated, for which the map of units was prepared by crossing maps of land use, geology, slope classes and grid layer created by the extension of et geo-wizards in arcgis 10.3. three indices of salinity, erodibility, and permeability of soil were considered and classified. weights of criteria and consistency ratio were cal...

We consider a broadcast model involving multiple transmitters and receivers. Transmission is performed in rounds, where in each round any transmitter is allowed to broadcast a single message, and each receiver can receive only a single broadcast message, determined by a priority permutation over the transmitters. The message received by receiver R in a given transmission round is the one sent b...

This paper reviews the recent development of the formal framework of priority algorithms for scheduling problems [BNR02]; the extension of the model for facility location and set cover [AB02], and graph problems [DI02]. We pose some open questions and directions for future research.

Dementia: Dementia is a term used to describe a collection of symptoms including memory loss, problems with reasoning and communication skills and a reduction in a person’s abilities and skills in carrying out daily activities such as washing, dressing, cooking and caring for self. Dementia is a progressive condition, which means that the symptoms will gradually get worse; the rate of decline v...

Countries around the world are experiencing an ever-increasing need to make choices in investments in health and healthcare. This makes it incumbent upon them to have formal processes in place to optimize the legitimacy of eventual decisions. There is now growing experience among countries of the implementation of stakeholder participation, and a developing convergence of methods to support dec...