As multicore processors become increasingly prevalent, system complexity is skyrocketing. The advent of the asymmetric multicore compounds this – it is no longer practical for an average programmer to balance the system constraints associated with today’s multicores and worry about new problems like asymmetric partitioning and thread interference. Adaptive, or self-aware, computing has been pro...

There is wide variation in the use of solutions to "lock" or fill tunneled central venous catheters for dialysis. Some centers use undiluted heparin concentrations ranging from 1000 to 10,000 U/ml and other centers place from 1000 to 10,000 U per lumen. Based on available evidence, it appears that heparin 1000 U/ml, or 4% sodium citrate are suitable choices for lock solution to maintain patency...

The negative side-effects of using lock-based synchronization mechanisms are well known and include unexpected scheduling anomalies such as priority inversion and convoying as well as unnecessary synchronization overhead and the potential for deadlock. Despite these drawbacks, the use of lock-free techniques has not gained widespread acceptance. The reasons for this lack of acceptance include t...

This paper attempts to provide additional evidence that married males who hold employerprovided health insurance (EPHI) are not locked into their jobs. Most of the previous literature on job-lock nds reductions in the mobility of these workers of between 20 and 40%. We introduce two new strategies for generating unbiased estimates of job-lock. First, a feature unique to the National Longitudina...

O software poses a serious challenge to proprietary software vendors. “Lock in customers” seems a tempting strategy for proprietary software vendors, who attempt to lock in customers by creating switching costs. This paper examines whether such a lock-in strategy will indeed benefit proprietary software vendors facing competition from open-source software, who can credibly commit future prices....

In this paper we propose a new dynamic access control method for the computer system with frequently inserted, deleted and updated users/files. Our method, based on the concepts of the access control matrix, key-lock-pair, time stamp and Chinese remainder theorem, associates each user with a user key and a user lock and each file with a file key and a file lock. Our method can achieve the follo...

Modern implementations of DBMS software are intended to take advantage of high core counts that are becoming common in high-end servers. However, we have observed that several database platforms, including MySQL, Shore-MT, and a commercial system, exhibit throughput collapse as load increases into over-saturation (where there are more request threads than cores), even for a workload with little...

Concurrent implementations of abstract types usually rely on lock-free primitives or locks and are highly tuned to support a finite set of efficient operations. However, it is very hard to extend such types for specific needs by adding new operations. The synchronization based on memory transactions, which is generally less efficient than based on lock-free primitives or locks, has been propose...

BACKGROUND Different suspension systems that are used within prosthetic devices may alter the distribution of pressure inside the prosthetic socket in lower limb amputees. This study aimed to compare the interface pressure of a new magnetic suspension system with the pin/lock and Seal-In suspension systems. METHODS Twelve unilateral transtibial amputees participated in the study. The subjects...

O software poses a serious challenge to proprietary software vendors. “Lock in customers” seems a tempting strategy for proprietary software vendors, who attempt to lock in customers by creating switching costs. This paper examines whether such a lock-in strategy will indeed benefit proprietary software vendors facing competition from open-source software, who can credibly commit future prices....