Locking granularity refers to the size of a lockable data unit, called a "granule", in a database system. Fine granularity improves system performance by increasing concurrency level but it also increases lock management overhead. Coarse granularity, on the other hand, sacrifices system performance but lowers the lock management cost. This paper explores the impact of granule size on performanc...

The communication latency presents a major challenge to achieving high responsiveness for Internet-based cooperative editing systems. In this paper, we propose conflict control locking (post-locking) schemes for conflict resolution in real-time object-based cooperative graphics editors. With these schemes, no locking request is needed before applying an editing operation to an object, instead, ...

While standard locking libraries are common and easy to use, delegation algorithms that offload work to a single thread can achieve better performance in multithreaded applications, but are hard to use without adequate library support. This paper presents an interface for delegation locks together with libraries for C and C++ that make it easy to use queue delegation locking, a versatile highpe...

We report a novel application of self-injection locking. A diode laser is injection locked to its own frequency-shifted emission. By resonant phase modulation of the fed-back light, the laser's emission frequency is shown to swing periodically through the locking range. The laser operates as a sweep generator driven by resonant self-injection locking.

We generalize the classical Legendre-Hadamard conditions by using quadratic extensions of the energy around a set of two configurations and obtain new algebraic necessary conditions for nonsmooth strong local minimizers. The implied bounds of stability are easily accessible as we illustrate on a nontrivial example where quasiconvexification is unknown.

“Phan~oma” are records inserted into a concurrently aelected set of records specified by a predicate such that Ihe selection does not eee a transaction conaietent result. The usual locking slrategy is lo lock only czisling records. However, records that satisfy the eeleclion predicate muat be locked even when they are nol present in the database to prevent their insertion. One way to cope with ...

Environmentally stable high-power erbium fiber soliton lasers are constructed by Kerr or carrier-type mode locking. We obtain high-energy pulses by using relatively short fiber lengths and providing large amounts of negative dispersion with chirped fiber Bragg gratings. The pulse energies and widths generated with both types of soliton laser are found to scale with the square root of the cavity...