Although vacation from work provides a valuable opportunity for recovery, few studies have met the requirements for assessing its effects. These include taking measurements well ahead of the vacation, during the vacation and at several points in time afterwards. Our study on vacation (after ) effects focused on two related questions: (1) Do health and well being of working individuals improve d...

In this paper we deal with an M/G/1 vacation system with the sojourn time (wait plus service) limit and two typical vacation rules, i.e. multiple and single vacation rules. Using the level crossing approach, explicit expressions for the steady-state distributions of the virtual waiting times are obtained in vacation systems with exponential and constant service times, a general vacation time, a...

A Bernoulli schedule is random service discipline for a multi-class priority queueing system which operates as follows: If queue i(l :s i :s N) is not empty just after servicing a message in its queue, a message in queue i is served again with probability Pi, and the highest class message present in the system is served with probability 1-Pi, where 0 :s Pi :s 1. This paper presents an analysis ...

Three different types of context-aware mobile learning applications were revealed in our literature review – location-dependent, location-independent and situated learning. Our theoretical framework – mobile context-aware adaptive learning schedule (mCALS) was constructed. This uses a proactive approach – the learner’s schedule (i.e. an electronic organizer) to retrieve the location and time av...

We study two apparently different, but formally similar, scheduling problems. The first problem involves contract algorithms, which can trade off run time for solution quality, as long as the amount of available run time is known in advance. The problem is to schedule contract algorithms to run on parallel processors, under the condition that an interruption can occur at any time, and upon inte...

PURPOSE The purpose of this paper is to describe current physician scheduling and concomitant opportunities for improvement in public hospital departments in Sweden. DESIGN/METHODOLOGY/APPROACH A total of 13 departments spread geographically across Sweden covering seven different specialties participated in the study. Data were collected through interviews with individuals involved in creatin...

In Cognitive Radio Mesh Networks (CogMesh), Secondary Mesh Routers (SMRs) can opportunistically utilize the licensed spectrums for the traffic of the Secondary Mesh Users (SMUs). How to guarantee Quality of Service (QoS) for real-time services over CogMesh is still an opening issue. In this paper, we present a discrete-time vacation queueing system to abstract the Primary User (PU) interruption...