INFORMS OS Today 4(1)

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INFORMS OS Today 4(1) INFORMS OS Today The Newsletter of the INFORMS Optimization Society Volume 4 Number 1 May 2014 Contents Chair's Column ............................. 1 Chair's Column Nominations for OS Prizes ................. 28 Nominations for OS Officers ............... 29 Sanjay Mehrotra Industrial Engineering and Management Sciences Host Sought for the 2016 OS Conference ....29 Department, Northwestern University [email protected] Featured Articles My Nonlinear (Non-Straight) Optimization Path Donald Goldfarb . .3 Optimization is now becoming a household Looking Back at My Life word in communities across engineering, man- Alexander Shapiro . 10 agement, health and other areas of scientific re- search. I recall an advice from my department Adding Squares: From Control Theory to Opti- chairman when I came up for tenure over twenty mization years ago: `You need to explain in layman terms Pablo Parrilo . 14 the nature of optimization research, and demon- A Branch-and-Cut Decomposition Algorithm strate its use in practice. The promotion and for Solving Chance-Constrained Mathematical tenure committee is full of bench scientists, and Programs with Finite Support they don't understand what we do'. Hard work James R. Luedtke . 20 and persistence from our community members have lead in establishing optimization as a \core Sparse Recovery in Derivative-Free Optimization technology." The goal in front of us is to es- Afonso Bandeira . .24 tablish our leadership as drivers of research that changes the life of the common man. This is hard, since it requires simultaneous thinking in deep mathematical terms, as we all like to do, and in broad applied terms. However, I hope that the time to come will bring optimizers and optimization technology to new heights. Let us all work together to make it happen. Send your comments and feedback to the Editor: The present issue of the INFORMS Opti- mization Society newsletter, \INFORMS OS To- Shabbir Ahmed day," features articles by the 2013 OS prize win- School of Industrial & Systems Engineering ners: Donald Goldfarb and Alexander Shapiro Georgia Tech, Atlanta, GA 30332 (Khachiyan Prize for Lifetime Accomplishments [email protected] in Optimization), Pablo Parrilo (Farkas Prize for Mid-career Researchers), James Luedtke (Prize for Young Researchers), and Afonso Bandeira 2 INFORMS Optimization Society Newsletter (Student Paper Prize). These articles summa- rize their motivation of working on optimization problems, and the prize winning works. The arti- cles by Don Goldfarb and Alex Shapiro describe their very interesting life journeys that brought them to optimization research that is beautifully intertwined with events in their personal lives. In a similar spirit Pablo's article \Adding squares: from control theory to optimization" takes us through the motivation of his work in polynomial optimization. Jim Luedtke summarizes his very interesting work in the paper \A branch-and- From root to leaves: Ilya Hicks, James Luedtke, Dan cut decomposition algorithm for solving chance- Steffy, Gustavo Angulo, Jeff Linderoth, Akshay Gupte constrained mathematical programs with finite support" for which he won the Young Researcher award. Afonso Bandeira summarizes his work very strong presence at the annual INFORMS on \Sparse recovery in derivative-free optimiza- meetings, the next one being in San Francisco, tion" that he completed with Katya Scheinberg California on November 9-12 at the Hilton and and Lu´ısN. Vicente with motivation from com- Union Square and Parc 55 Wyndham. Our par- pressed sensing. ticipation is organized via the OS sponsored clus- In this issue we also have announcements of ters, which are organized by our Vice Chairs: key OS activities: Calls for nominations for the 2014 OS prizes, a call for nominations of can- • Imre Polik, Computational Optimization didates for OS officers, and a call for the OS and Software ([email protected]) 2016 Conference. The previous five conferences • Leo Liberti, Global Optimization have had a diverse set of themes: \Optimization ([email protected]) and HealthCare" (San Antonio, 2006); \Theory, • Juan Pablo Vielma, Integer and Discrete Computation and Emerging Applications" (At- Optimization ([email protected]) lanta, 2008); \Energy, Sustainability and Cli- • John Mitchell, Linear and Conic Optimiza- mate Change" (Gainesville, 2012); \Optimiza- tion ([email protected]) tion and Analytics" (Coral Gables, 2012); and • Vladimir Boginski, Network Optimization \Optimization and Big Data" (Houston, 2014). ([email protected]) The 2014 edition of the INFORMS Optimization • Andreas W¨achter, Nonlinear Optimization Society Conference was held March 6-8 in Hous- ([email protected]) ton, Texas, hosted by the Department of Compu- • Andrew Schaefer, Optimization under Un- tational and Applied Mathematics at Rice Uni- certainty ([email protected]) versity. Many thanks go to Ilya Hicks who served as the general conference chair, and to the other You will note that the area names of several of members of the organizing committee: Matthias the vice-chairs have changed. Nearly 225 mem- Heinkenschloss and Wotao Yin. The conference bership votes were received for the name change was attended by more than 125 participants from ballot that was sent out earlier this year. Inte- eight countries. It featured 104 talks in 29 ses- ger Programming is now called Integer and Dis- sions, 4 outstanding plenary talks, amazing food, crete Optimization (92% in favor of change); Lin- and { in keeping with OS Conference tradition ear Programming and Complementarity is now { at least one confirmed human pyramid. Please called Linear and Conic Optimization (81% in fa- consider being active in the nomination process, vor of change); Networks is now called Network as well as hosting the 2016 OS conference. Optimization (90% in favor of change); Nonlin- Optimization Society has traditionally had a ear Programming is now called Nonlinear Opti- Volume 4 Number 1 May 2014 3 mization (85% in favor of change); and Stochas- from an early age I was fascinated by mathemat- tic Programming is now called Optimization un- ics. I was admitted to the elite math-oriented der Uncertainty (71% in favor of change). Stuyvesant High School in New York City. How- Our impressive presence within INFORMS ever, due to my family's move to the outer is due to the hard work of our vice-chairs, reaches of Queens which made the daily com- and it reflects the very large membership of mute to Stuyvesant prohibitively long, I went to the OS. Please contact appropriate Vice Chairs an ordinary high school with little exposure to to get involved. I want to remind you that interesting mathematics. While in high school, I Pietro Belotti continues to be the OS webmas- could not imagine how becoming a mathemati- ter, and he is always pleased to get your feedback cian could lead to a career. I naively thought on our website: www.informs.org/Community/ that to be a mathematician one had to be like Optimization-Society. Euclid and invent geometry. So when I applied I look forward to seeing you at the INFORMS to college, I chose chemical engineering as it in- national meeting in November, in particular, at volved science and mathematics, my strongest the OS Prize session, and the OS Business Meet- academic subjects. During my first week as a ing. The latter is always one of the highlights student at Cornell, I discovered that there was of an INFORMS meeting to have some refresh- a program in Engineering Physics that required ments, meet with old friends and make new ones. ten semesters of mathematics (engineering was a five-year program in those days). This appealed to me, but when I asked the Dean of Engineer- ing to switch to it from the Chemical Engineer- My Nonlinear ing program that I had selected before arriving on campus, he counseled me to not change my (Non-Straight) selection as there was a common core program Optimization Path during the first two years in engineering, and I Donald Goldfarb could transfer later if I did well. I did well, espe- Department of Industrial Engineering and Operations cially in math, but I had many Chem. E. friends Research, Columbia University, New York, NY 10027 and stayed on as a Chem. E., principally out [email protected] of inertia. When I applied to graduate school, I again considered going on in math, but since I seemed to be good at chemical engineering and It is truly a great honor to have been selected believed that doctoral studies in chemical engi- as a recipient of the 2013 INFORMS Khachiyan neering would be more challenging than my un- Prize for Lifetime Achievements in Optimiza- dergraduate studies, again inertia won out. tion. I would like to take this opportunity to I arrived at Princeton in the fall of 1963 relate how I arrived at this point in my career. and chose to work on stochastic optimal con- It was certainly not a direct path that I followed, trol problems in chemical engineering. My ini- but one that has brought me great satisfaction tial approach was based on Pontryagin's maxi- and deep and lasting friendships with other op- mum principle. This involved solving two-point timizers. However, first I wish to humbly thank boundary value problems, which required guess- the members of the prize committee who selected ing the values of the adjoint (dual) variables me, Jorge Nocedal (chair), Michael Todd, Jean- at the initial time and then minimizing their Philippe Vial, and Lawrence Wolsey and to my deviation from their known values at the final friends and colleagues, Sanjay Mehrotra, Michael time. Unfortunately, this process was extremely Overton and Katya Scheinberg who nominated unstable and unless one's guess was very close me. to the correct initial values, the adjoint system I did not start out as a mathematician; in fact of differential equations blew up. Fortuitously, all my degrees are in chemical engineering. But around this time (fall 1965) I learned about 4 INFORMS Optimization Society Newsletter gradient and second-order methods that had mination properties of the DFP method worked been recently proposed by Arthur Bryson and for my projected version of the DFP method, others to solve optimal control problems, and I knew that I had the basis for a thesis.
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