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Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

The Impact Of Reprovisioning On The Choice Of Shared Versus Dedicated Networks, Soumya Sen, Kristin Yamauchi, Roch Guerin, Kartik Hosanagar Sep 2010

The Impact Of Reprovisioning On The Choice Of Shared Versus Dedicated Networks, Soumya Sen, Kristin Yamauchi, Roch Guerin, Kartik Hosanagar

Departmental Papers (ESE)

As new network services emerge, questions about service deployment and network choices arise. Although shared networks, such as the Internet, offer many advantages, combining heterogeneous services on the same network need not be the right answer as it comes at the cost of increased complexity. Moreover, deploying new services on dedicated networks is becoming increasingly viable, thanks to virtualization technologies. In this work, we introduce an analytical framework that gives Internet Service Providers the ability to explore the trade-offs between shared and dedicated network infrastructures. The framework accounts for factors such as the presence of demand uncertainty for new services ...


Online Optimization Of 802.11 Mesh Networks, Theodoros Salonidis, Georgios Sotiropoulos, Roch A. Guérin, Ramesh Govindan Oct 2009

Online Optimization Of 802.11 Mesh Networks, Theodoros Salonidis, Georgios Sotiropoulos, Roch A. Guérin, Ramesh Govindan

Departmental Papers (ESE)

802.11 wireless mesh networks are ubiquitous, but suffer from severe performance degradations due to poor synergy between the 802.11 CSMA MAC protocol and higher layers. Several solutions have been proposed that either involve significant modifications to the 802.11 MAC or legacy higher layer protocols, or rely on 802.11 MAC models seeded with off-line measurements performed during network downtime.

We introduce a technique for online optimization of 802.11 wireless mesh networks using rate control at the network layer. The technique is based on a lightweight model that characterizes the feasible rates region of an operational 802 ...


A Plan For Septa's Regional Metrorail System, Vukan R. Vuchic, Shinya Kikuchi Apr 1993

A Plan For Septa's Regional Metrorail System, Vukan R. Vuchic, Shinya Kikuchi

Departmental Papers (ESE)

This report presents a plan for an investment, physical and operational upgrading of the RGR System. The intent of this plan should be creation of a modern Regional Metrorail System, more similar to such electrified regional rapid transit systems as the Washington Metrorail, Atlanta's MARTA and San Francisco's BART than to diesel-powered commuter rail systems, such as the Chicago METRA or the new Los Angeles Metrolink.


Recommendations For Improvement Of Green Lines Subway Operations, Vukan R. Vuchic, Shinya Kikuchi Jun 1990

Recommendations For Improvement Of Green Lines Subway Operations, Vukan R. Vuchic, Shinya Kikuchi

Departmental Papers (ESE)

The purpose of this project is to analyze present operations of the Green Lines in the subway and develop solutions to the operational problems, so that the great potential of the subway for high performance and an attractive level of service for passengers can be fully realized.


Infrastructure And Operational Improvements Of The Septa Regional Rail System, Vukan R. Vuchic, Shinya Kikuchi May 1987

Infrastructure And Operational Improvements Of The Septa Regional Rail System, Vukan R. Vuchic, Shinya Kikuchi

Departmental Papers (ESE)

Since its takeover of the Regional Rail System from Conrail in 1983, SEPTA has made numerous efforts to adjust its facilities and operations to the needs of a modern regional rail system. In order to meet the needs of a modern transit-type operations of regional rail with shorter headways and greater operational flexibility, the infrastructure, such as track layout and signals, is one of the elements that requires changes. The current infrastructure was originally designed for freight and long distance railroad operations. This study represents part of SEPTA's efforts to modernize its regional rail infrastructure and operations in a ...


General Operations Plan For The Septa Regional High Speed System, Vukan R. Vuchic, Shinya Kikuchi May 1984

General Operations Plan For The Septa Regional High Speed System, Vukan R. Vuchic, Shinya Kikuchi

Departmental Papers (ESE)

The purpose of this project has been to plan line pairings in the unified Regional High Speed Lines (RHSL) network when the Center City Tunnel is opened. While detailed schedules were not part of this project, headways and train consists have been determined for all lines for peak and off-peak periods.