We analyze the performance of Size Interval Task Assignment (SITA) policies, for multi-host assignment in a non-preemptive environment. Assuming Poisson arrivals, we provide general bounds on the average waiting time independent of the job size distribution. We establish a general duality theory for the performance of SITA policies. We provide a detailed analysis of the performance of SITA syst...

The M/G/K queueing system is one of the oldest models for multiserver systems and has been the topic of performance papers for almost half a century. However, even now, only coarse approximations exist for its mean waiting time. All the closed-form (nonnumerical) approximations in the literature are based on (at most) the first two moments of the job size distribution. In this paper we prove th...

We consider a cluster of heterogeneous servers, modeled as M/G/1 queues with different processing speeds. The scheduling policies for these servers can be either processor-sharing or first-come first-serve. Furthermore, a dispatcher that assigns jobs to the servers takes as input only the size of the arriving job and the overall job-size distribution. This general model captures the behavior of...

Recent studies of Internet traffic have shown that flow size distributions often exhibit a high variability property in the sense that most of the flows are short and more than half of the total load is constituted by a small percentage of the largest flows. In the light of this observation, it is interesting to revisit scheduling policies that are known to favor small jobs in order to quantify...

Ability of managers and other nonproduction professionals is key for the productivity of firms. Hence, the assignment of heterogeneous nonproduction workers across firms determines the distribution of productivity. In turn, the transmission of productivity differences into profit differences — resulting from product market competition — determines firms’ willingness to pay for higher managerial...

This paper proposes and analyzes an integrated model of salesforce learning, product portfolio pricing and salesforce design. We consider a firm selling two products, with a pool of sales representatives that is split into separate salesforces, one for each product. The salesforce assigned to each product is faced with an independent stream of sales leads. The salesforce may also handle leads t...

We describe the application of simulation and statistical analysis to the problem of optimization of palletization in a production job shop. These analyses enabled management responsible for the production of this job shop to optimize the number of pallets, the size (carrying capacity) of the pallets, the associated workin-process levels, and policy regarding level of safetystock kept on hand a...

the mail goal of the present paper is to study the influence of informal social networkssupport on job satisfaction of married women using the direct effect of social support anddurkheimian anomie theories and network analysis perspective. it has been performed usingsurvey method and questionnaire. statistical population is constituted of all working andmarried women (20-55) living in ardabil. ...

This article introduces a new class of experimental designs, called split factorials, which allow for the estimation of both response surface effects (fixed effects of crossed factors) and variance components arising from nested random effects. With an economical run size, split factorials provide flexibility in dividing the degrees of freedom among the different estimations. For a split factor...