In this paper we present a cross-cutting design principle for binary decision control (BDC) based congestion control systems, such as AIMD. Due to its discontinuity, constructing the switching function, or the onset condition of the congestion bit, must consider the relative degree and zero dynamics of the system based on sliding mode control (SMC) theory. We showed that the relative degree of ...

A theory of resource sharing in a mixed system with hard real-time and non-real-time processing requirements is presented. The real-time processing is modeled as rate-based execution (RBE) tasks whose resource needs are known in advance. The non-real-time processing is modeled as aperiodic requests and dynamically mapped to weight-based variable rate execution tasks. The resource sharing requir...

an important issue in power generation and petrochemical industries is the monitoring of pipe wall thickness and corrosion/erosion rate. the pipes are usually subject to erosive and/or corrosive environments and any failure could be catastrophic. while periodic manual ultrasonic thickness measurement is the common practice in many industries, in certain cases, where higher accuracies are requir...

Monitoring the flow rate out of the well is critical for good control of the downhole pressure in drilling operations. In this feasibility study, we explore the possibility of using a Venturi flume to provide a cost-effective measurement of the flow rate, with improved accuracy compared to conventional methods. A Venturi flume has been simulated both using CFD and a simplified 1D model. By prop...

A model for the computation of the airspace utilization rate is put forward to help the airspace manager assess the airspace usage effectively. Through proposing the concept of “airspace load”, the airspace resource is quantified and a new definition of the airspace utilization rate is introduced. Based on the new definition and the research about airspace capacity and air traffic flow manageme...

In this study we describe a model of speech perception in which neither speaking rate nor lower level temporal cues are considered explicitly. Instead, newly encountered speech signals are encoded as sequences of detailed acoustic events specified in real time at salient landmarks and compared directly with previously heard patterns. When presented with obstruent-vowel sequences occurring in th...

Chemical Vapor Deposition (CVD) is one of the most popular methods for producing Carbon Nanotubes (CNTs). The growth rate of CNTs based on CVD technique is investigated by using a numerical model based on finite volume method. Inlet gas mixture, including xylene as carbon source and mixture of argon and hydrogen as carrier gas enters into a horizontal CVD reactor at atmospheric pressure. In thi...

Permeability reduction in oil reservoirs during primary oil recovery and using the enhanced oil recovery methods are complicated problem which most of the oil field in worlds has encountered. In this work, a modified model based on four phase black oil model (oil, water, gas, and asphaltene) was developed to account permeability reduction during CO2 flooding in cylindrical coordinates around a ...

this paper presents a biogeography-based optimization (bbo) algorithm to solve the economic loaddispatch (eld) problem with generator constraints in thermal plants. the applied method can solvethe eld problem with constraints like transmission losses, ramp rate limits, and prohibited operatingzones. biogeography is the science of the geographical distribution of biological species. the modelsof...