In a deregulated electricity market, Ancillary Services are essential for the adequate operation of the bulk power system. In order to procure reactive power support, it is necessary to quantify the value of the VAr’s available sources within the system. This paper focuses on reactive power supply and voltage control on transmission networks. An optimization approach is proposed to determine th...

Motivated by many practical applications, in this paper we study budget feasible mechanisms where the goal is to procure independent sets from matroids. More specifically, we are given a matroid M = (E, I) where each ground (indivisible) element is a selfish agent. The cost of each element (i.e., for selling the item or performing a service) is only known to the element itself. There is a buyer...

A semaphore is a data structure designed to track how many units of some resource are available. It also provides operations to increase or decrease the number, representing the creation or the consumption of that resource, respectively. A process that wishes to consume one unit of the resource, when none are available, will be blocked until one new unit of the resource is created. Semaphores a...

Many parallel programs are expressed in terms of conditional atomic actions with different degrees of atomicity. It is known that these synchronization primitives are expensive to implement in its fully generality [2]. Many platforms provide an efficient set of synchronization primitives. Semaphores are a very special case of conditional atomic actions which can be considered a canonical synchr...

Monitors have become an exceedingly important synchronization mechanism because they are a natural generalization of the object-oriented programming. A monitor construct encapsulates private data with public methods to operate on that data. Although the Pthread library contains dozens of functions for threading and synchronization, it does not provide direct support for the monitor. Students mu...

Performance of high-speed multiprocessor systems is limited by the available bandwidth to memory and the need to synchronize write sharable data. This paper presents a new memory system that separates synchronization related data from others. The memory system has two tiers: synchronization memory and high bandwidth (HB) memory. The synchronization memory consists of snooping caches connected t...

Education is an important for students. Based on the recapitulation of senior high school exam by Ministry and Culture (KEMENDIKBUD), average results biology in 2017 below graduation level value 45.01. This because limited class hours. For this reason, new media needed to help students deepen lesson, case game. Educational game one that can be used provide education players through interactive ...

We suggest various highly simpliied models which may be employed to make estimates of the performance of a concurrent program running on a multiprocessor machine. We try to nd a small set of parameters which have an important innuence on performance, and conduct simulation experiments on synthetic programs whose parameter values are varied systematically. We then apply standard statistical meth...

In this paper we study a situation in which a broker must manage the procurement of a short life cycle product. As the broker observes demand for the item, she learns about the demand process. However, as is often the case in practice, it becomes either more difficult or more expensive to procure the item as the selling season advances. Thus, the broker must trade-off higher procurement costs a...

Recent advances in semantic technology and mobile theory interfere in order to accomplish Lamport clocks. Given the current status of mobile configurations, mathematicians famously desire the robust unification of IPv6 and kernels that paved the way for the evaluation of semaphores. Our focus in our research is not on whether fiber-optic cables and Scheme are mostly incompatible, but rather on ...