This paper presents the AAected Set Priority Ceiling (ASPC) concurrency control protocol for real-time object-oriented databases. The protocol is based on a combination of a semantic locking technique and priority ceiling techniques. The paper speciies six criteria for real-time concurrency control: high concurrency, deadlock prevention, predictability, temporal consistency enforcement, logical...

Operating rooms (ORs) in US hospitals are costly to staff, generate about 70 % of a hospital's revenues, and operate at a staffed-capacity utilization of 60-70 %. Many hospitals allocate blocks of OR time to individual or groups of surgeons as guaranteed allocation, who book surgeries one at a time in their blocks. The booking procedure frequently results in unused time between surgeries. Reali...

We consider the open shop, job shop, and ow shop scheduling problems with integral processing times. We give polynomial-time algorithms to determine if an instance has a schedule of length at most 3, and show that deciding if there is a schedule of length at most 4 is N P-complete. The latter result implies that, unless P = N P, there does not exist a polynomial-time approximation algorithm for...

The study investigated teachers’ perception of the impact instructional strategies on pupils with reading difficulties in selected districts Central Region Ghana. A concurrent embedded mixed method design was used for this study. Proportionate stratified sampling procedure to select ninety-five (95) upper primary teachers response rate 100% representing 95 teachers. Data were collected using a ...