Showing posts with label network performance. Show all posts
Showing posts with label network performance. Show all posts

Wednesday, July 26, 2017

Great Time Speaking on Investing in Infrastructure on the Dr. Matt Townsend Show

Last April, I published an article in The Conversation, "Calculating where America should invest in its transportation and communication networks." 

The article was republished in multiple publications and in May I received an email from a very friendly segment producer of the Matt Townsend Show. The message stated that Dr. Townsend had read my article, liked it a lot, and would like to have me as a guest on his radio show. Multiple dates as options were provided, but, given my very busy conference schedule this summer, plus the fact that I am a Summer Fellow at the Radcliffe Institute for Advanced Study (RIAS) at Harvard, we settled on today as the date!

Trying to find a landline was not easy but, thanks to RIAS, a nice quiet and comfortable office was found and I also had a cell phone as a backup. I had listened to several segments of the show and very much enjoyed the facility with which Dr. Townsend asked questions and kept the conversation going on numerous timely topics being addressed by those that he was interviewing.

I came prepared with a bottle of water and my latte from Peet's to keep myself hydrated and pumped, which was easy.
 
Critical infrastructure networks is a topic I am extremely passionate about and have done research on with wonderful doctoral students from the Isenberg School as well as collaborators from Harvard to many other universities; some of these are Supernetwork Center Associates. Most notably, I mention Dr. Patrick Qiang, with whom I wrote the Fragile Networks book, and which was featured in the interview.



The interview can be accessed online.

Many thanks to Dr. Matt Townsend for the invitation to be on his show and for his terrific questions as an interviewer! I enjoyed the experience a lot.

And, coincidentally, afterwards, I had lunch with Professor David Parkes, a chaired professor of computer science at Harvard. When I was a Science Fellow at RIAS in 2005-2006, he, Professor Patrizia Daniele of the University of Catania, and I co-authored a paper on the Internet and the Braess paradox, which was published. 
Of course, in my interview with Dr. Matt Townsend I had to speak on the Braess paradox!

Sunday, August 30, 2015

Having Your Operations Research INFORM Policy

One of my favorite quotes on Operations Research is by INFORMS President-Elect Ed Kaplan of Yale University. It appears in  a paper that he wrote that was published in Omega, "Adventures in Policy Modeling! Operations Research in the Community and Beyond,"and says: Modeling need not be “off the shelf”—rather, modeling with OR techniques should be a celebration of creativity.

His paper is a very provocative and stimulating read  and shuts down naysayers.

The paper also is filled with examples as to how Operations Research has informed policy and associated decision-making. The article is focused on community-based policies.  Examples are drawn from urban applications (Dick Larson's research and practical applications), AIDS modeling and needle exchanges (work done by Kaplan), drug control (Jonathan Caulkins), and even homicides and gun availability (Al Blumstein's many contributions), to start, and, of course, security.  Some great work in this area has been done by, I note, among others, Ed Kaplan, Larry Wein, Sheldon Jacobson, and Laura McLay.

Operations Research has been instrumental in informing policies in other settings, as well, from transportation and logistics to the environment and even medical decision-making, and humanitarian operations.

I work on network systems with many associated applications and it is very gratifying when research that you do also informs policy.

A few years ago, in research conducted with Patrick Qiang, who was my doctoral student at the Isenberg School of Management, and with whom I wrote the Fragile Networks book, we introduced a network performance measure, which  allows for the identification and ranking of nodes and links in various network systems operating under decentralized behavior (think of urban transportation networks, certain supply chains, financial networks, and even the Internet). (Patrick is now a tenured Associate Professor at Penn State Great Valley, as of Fall 2015, so more congrats are in order!)

The results of this research appeared in various journals, including Operations Research ones, and even physics, since we wanted to disseminate the work broadly for maximum impact.  A high level overview of our results with some applications appears in: Fragile Networks: Identifying Vulnerabilities and Synergies in an Uncertain Age, Anna Nagurney and Qiang Qiang, International Transactions in Operational Research 19: (2012) pp 123-160.

The Nagurney-Qiang performance measure has been used in Indonesia to assess new shipping routes in a study financed in part, by the World Bank.   A nice overview of the approach is in a presentation on Prezi.

Our performance measure has also been used by researchers in Greece, led by Mitsakis and collaborators,  to conduct  network performance and components’ criticality analyses to assess the effects of the immense 2007 fires in Peloponnesus on vehicular traffic and the overall transport network.  See also recent work by some of the same researchers on climate change and our measure. 

In addition, it has been leveraged in an insightful report, "Guidebook for Enhancing Resilience of European Road Transport in Extreme Weather Events."

Schulz used our network performance measure to assess the importance of roadways in a part of Germany.  

It was also applied in Ireland to assess new Dublin metro lines. 

It has been utilized to assess the potential impact of earthquakes on critical infrastructure and is now even being applied outside the policy arena in physiological settings (yes, networks are everywhere and that is one reason why I love them!).

As for my work on paradoxes, including environmental ones, in 2007, one of my papers was featured in the New Zealand parliament; info here. 

Operations Researchers work on tough problems with solutions having broad and fascinating impacts!