Locks are efficient concurrent control mechanisms to ensure that shared resources are accessed by only a single thread in multi-threaded applications. However, for multi-core systems, lock usage leads to lock contention, which degrades program performance, increases system response time, and negatively affects scalability. This paper initially models lock contention from two aspects: static str...

Collaborations in innovation work between competitors have become a common practice in the information and communication technology sector (ICT), and substantial investments are made in such collaborations. Significant rationales for these collaborations include the high expectations placed on rapid and front-edge technology development and business exploitation. However, there is often a failu...

by drawing blood through a heparin lock, patients can be protected from skin damages duo to repeated needle sticks. in addition, this procedure can assist to gain more precise results in laboratory test and to prevent further complications. probably, you have ever used a heparin lock in order to infusion of medicines but, it is possible that you never use of that for blood sampling. both two pr...

1 The PLL (Phase Lock Loop) can synchronize with a deterministic input wave or with a random input symbols. In the first case we have a WPLL (Wave Phase Lock Loop) and in the second case we have a SPLL (Symbol Phase Lock Loop. The WPLL (Wave Phase Lock Loop) is also known as WLL (Wave Lock Loop) or only PLL (Phase Lock Loop). The SPLL (Symbol Phase Lock Loop) is also known as SLL (Symbol Lock L...

In this paper, we present the PR-lock, a prioritized spin-lock mutual exclusion algorithm for real time systems. The PR-lock is a contention-free spin lock, in which blocked processes spin on locally stored or cached variables. In contrast to previous work on prioritized spin locks, our algorithm maintains a pointer to the lock holder. As a result, our spin lock can support priority inheritance...

A methodology is developed for modeling entrainment in two-layer shallow water flows using non-standard conserved quantities, replacing layer-wise mass conservation by global energy conservation. Thus the energy that the standard model would regularly dissipate at internal shocks is instead available to exchange fluid between the layers. Two models are considered for the upper boundary of the f...