The general purpose of this study is to develop both efficient and equitable freeway ramp control strategies. Measures of efficiency and equity for ramp meters are defined and applied to data collected in the Twin Cities ramp metering shut-off experiment. A trade-off between efficiency and equity is evident from the results of data analysis. A new time-dependent optimization program for the glo...

The purpose of this study was to develop and evaluate the flow rate, spray pattern, and droplet spectra characteristics of an actively controlled variable-orifice nozzle at constant carrier pressures. A commercially available variable-orifice nozzle (VariTarget) was modified to allow for direct electromechanical control of the metering stem. The modified system was tested at five carrier pressu...

This paper describes the evaluation approach that will be used to assess the performance of the Ramp Metering Control (RMC) for the New Jersey Department of Transportation in the United States. The primary objectives of the evaluation are to assess the impact of RMC control strategies on traffic flow and support the analysis of critical operational procedures. The framework for the evaluation c...

This paper formulates the ramp metering control problem as a real-time feedback control problem. The development is shown by modeling freeway sections, and hence the results are immediately applicable to isolated ramp metering problems. The ideas presented in this paper can be utilized to develop coordinated ramp metering feedback control techniques. Three different forms of the formulation for...

The recently developed traffic-responsive feedback control strategy HERO (HEuristic Ramp metering cOordination), that coordinates local ramp-metering actions in freeway networks, was implemented at the M1/M3 Freeway in Queensland, Australia. HERO employs an extended version of the feedback regulator ALINEA at the local level. HERO outperforms uncoordinated local ramp metering and approaches the...

Optimized Profile Descent (OPD) is an arrival procedure for the Next Generation Air Transportation System (NextGen), which has been demonstrated to effectively decrease noise, emissions and fuel costs. Reference [1] identifies optimal sequencing and spacing policies for OPD operations under uncertainty and shows that the use of these policies at given metering points is expected to result in po...

Ramp metering has been broadly accepted and deployed as an effective countermeasure against both recurrent and non-recurrent congestion on freeways. However, many current ramp metering algorithms tend to improve only freeway travels using local detectors' inputs and overlook the negative impacts on local streets. This may generate two problems: 1) the optimal local settings may not result in a ...

The seed filling of a seed-metering device is critical process in sugarcane cultivation operations. To analyze the contact between billets, related mechanical components, and law billets movement device, simulation seed-filling based on EDEM was proposed, geometric model particle model, were established by software. physical experimental results angle repose compared. showed that relative error...

Naor and Pinkas introduced metering schemes at Eurocrypt '98 in order to decide on advertisement fees for web servers. In the schemes, any server should be able to construct a proof to be sent to an audit agency if and only if it has been visited by at least a certain number, say k, of clients. This paper rst shows an attack for their schemes such that only two malicious clients can prevent a s...

As a result of recent changes in the policy governing internet content distribution, such as the institution of per listener royalties for internet radio broadcasters, Content Distributors (CDs) now have an incentive to underreport the size of their audience. Existing metering protocols protect only against the inflation of audience size. We introduce the first protocols for audience metering t...