Highly varying job demands generally consist of many short jobs mixed with several long jobs. In this paper, we consider a simple scenario where two job streams with different level of demands must be processed by the same server. We study the performance of several round-robin variants and FCFSP in such a scenario. The simulation results show that on the one hand, by employing immediate preemp...

Given N request streams and L N LRU caches, the cache assignment problem asks to which cache each stream should be assigned in order to minimize the overall miss rate. An eecient solution to this problem is provided, based on characterizing each stream using the stack reference model and characterizing the interaction of the streams using a bursty stream model. It is shown that for Bernoulli (p...

Two-stream instability is a basic plasma phenomenon and has been investigated for many decades. Beam-plasma related instabilities, such as filamentation instability, recently undergone a renewed interest due to the Fast Ignition Scenario for Inertial Fusion in which a laser generated relativistic electron beam is to ignite to pre-compressed DT core of the target. In this regard, a systematic ef...

A numerical investigation has been carried out for mixed convection flow in a rectangularventilated cavity with a heat conducting solid circular cylinder at the center. Forced convection flowconditions were imposed by providing an inlet at the bottom of the left wall and an outlet vent at the topto the other sidewall. In this paper, the effect of cavity aspect ratio as well as the mixed convect...

The toxicity of an acid mine drainage (AMD) mixing zone was investigated by placing bluegill (Lepomis macrochirus) at the confluence of a stream contaminated by AMD and a stream having neutral pH. A mixing channel receiving water from both streams was assembled in the field, during July and October 1996, to determine the toxicity of freshly mixed and aged water (2.9-7.5 min). The AMD stream had...

This study introduces a methodology for cooperative signal timing and trajectory optimization at intersections with mix of connected automated vehicles (CAVs) human-driven (HVs). We represent joint control as mixed-integer non-linear program, which is computationally complex. The developed provides balance between computational efficiency solution quality by (a) linearizing the nonlinear constr...

Spatial autocorrelation is an intrinsic characteristic in freshwater stream environments where nested watersheds and flow connectivity may produce patterns that are not captured by Euclidean distance. Yet, many common autocovariance functions used in geostatistical models are statistically invalid when Euclidean distance is replaced with hydrologic distance. We use simple worked examples to ill...

Mitigating stream and river impairment is complex, particularly in mixed-land-use watersheds given the likelihood of integrated responses of stream restoration to coupled and ongoing terrestrial ecosystem disturbance and the need for periodic reassessment and maintenance. Traditional biological sampling (e.g., macroinvertebrate sampling or other biological indices) alone seldom identifies the c...