One of the most challenging aspects to designing a Java messaging system for HPC is the intermediate buffering layer. The lower and higher levels of the messaging software use this buffering layer to write and read messages. The Java New I/O package adds the concept of direct buffers, which—coupled with a memory management algorithm—opens the possibility of efficiently implementing this bufferi...

In many situations we have to make repeated decisions in an uncertain environment. Those decisions include to choose a route to drive to work, when to refuel a car or when to purchase and sell shares in the stock market. In each of those settings we decide which actions we take, although we do not possess complete information about the situation. Since part of the missing information might infl...

INTRODUCTION AND OBJECTIVES To characterize the viscoelastic properties of the aorta and pulmonary arteries and the effects of vascular smooth muscle activation on arterial buffering function. MATERIAL AND METHOD Aortic and pulmonary artery pressure and diameter were measured in six anesthetized sheep under baseline conditions, and during arterial hypertension induced by mechanical vascular o...

Xiaoming Zhu Joseph M. Kahn University of California Department of Electrical Engineering and Computer Sciences 307 Cory Hall Berkeley, California 94720-1772 E-mail: [email protected] Abstract. Buffering with optical delay lines (ODLs) in optical packetswitching networks is a way to mitigate network contention. We study queueing models of ODLs in synchronous and asynchronous optical packe...

bstract —Rapid changes in extracellular K concentration [K ]o) in the mammalian CNS are counteracted by simple assive diffusion as well as by cellular mechanisms of K learance. Buffering of [K ]o can occur via glial or neuronal ptake of K ions through transporters or K -selective chanels. The best studied mechanism for [K ]o buffering in the rain is called K spatial buffering, wherein the glial...

The hypernetwork is a molecular interaction-based model that has learning capabilities. The adaptive algorithm randomly changes the molecular structures and selects the best individual. Experiments with the hypernetwork show the importance for evolution of the mutation buffering capabilities of the system. Mutation buffering allows the system to improve its search for peaks in the fitness lands...

Buffering of H+ and OHions in pure water probably represent the most primal physicochemical buffering phenomena, and their quantitative description is of great interest. In this context, “pure water” shall mean water without any solutes that could act as H+ buffers. In the following, it is understood that addition of H+ ions to pure water, or removal of H+ ions from it is carried out in the for...

In this paper, lean buffering (i.e., the smallest level of buffering necessary and sufficient to ensure the desired production rate of a manufacturing system) is analyzed for the case of serial lines with machines having Weibull, gamma, and log-normal distributions of upand downtime. The results obtained show that: (1) the lean level of buffering is not very sensitive to the type of upand downt...

Background: The paradigm of "buffering" originated in acid-base physiology, but was subsequently extended to other fields and is now used for a wide and diverse set of phenomena. In the preceding article, we have presented a formal and general approach to the quantitation of buffering action. Here, we use that buffering concept for a systematic treatment of selected classical and other bufferin...