We consider non-blocking synchronization for dynamic embedded real-time systems such as those that are subject to resource overloads and arbitrary activity arrivals. The multi-writer/multi-reader problem inherently occurs in such systems, when their activities must concurrently and mutually exclusive share data objects. We consider lock-free synchronization for this problem under the unimodal a...

A versatile, low-cost, digital signal processor (DSP) based lock-in module with external reference is described. This module is used to implement an industrial spectrophotometer for measuring spectral transmission and reflection of automotive and architectonic coating glasses over the ultraviolet, visible and near-infrared wavelength range. The light beams are modulated with an optical chopper....

Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com Lock-in amplifiers are used to detect and measure very small AC signalsall the way down to a few nanovolts. Accurate measurements may be made even when the small signal is obscured by noise sources many thousands of times larger. Lock-in amplifiers use a technique known as phase-sensitive detection to single out the component of t...

In the last fteen years, lock managers for regular disk-based database systems have seen little change. This is not without reason, since traditional memory-resident lock managers have always been much faster than disk-based database storage managers and disk-based database systems had few alternative design options. However, the introduction of memory-resident database systems has created both...

Lock-free programming is a well-known technique for multithreaded programming. Lock-free programming is a way to share changing data among several threads without paying the cost of acquiring and releasing locks. On practice, parallel programming models must include scalable concurrent algorithms and patterns. Lock-free programming patterns play an important role in scalability. This paper is d...

The exibility of nested transactions is generally provided at the expenses of a more complex locking mechanism which must deal with expensive lock inheritance. In this paper, we give a solution for eecient lock inheritance. Our solution does not change the original nested transaction model but does revisit its locking rules using set-oriented semantics. This allows us to trade the cost of lock ...

The 28 lock and dams sites on the upper Mississippi River is currently central to transporting U.S. agricultural commodities to the world market. This aging lock and dam system and slow double lockage process at the 600-foot locks have generated concern about its navigational efficiency. The objective of this study is to examine the determinants of delay occurred at the lock and dam system on t...

in this research was designed a differential lock control system. the system was test and evaluated after fabrication and its accuracy and precision was determined. a field experiment with three replications was conducted to investigate the effect of gear ratio, the method of tractor movement during plowing and differential position on drive wheel slippage and fuel consumption of mf399 tractor ...

conclusions percutaneous ethanol sclerotheraphy in simple cysts is a safe, cost-effective and minimally invasive method. we consider that this technique may be an alternative solution in the percutaneous cyst treatment. results fifty-seven cysts had complete regression, while 31 cysts regressed partially. after the procedure, pain was relieved in 44 (82%) patients and the pain alleviated in fou...