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- Ahmad Abdi, Ricardo Fukasawa
- Math. Program.
- 2016

- Ali Moradi, Ahmad Abdi, Ali Fathi-Ashtiani, Tim Dalgleish, Laura Jobson
- Behaviour research and therapy
- 2012

This study examined the recollection of autobiographical material in memory among Iranian military veterans with and without posttraumatic stress disorder (PTSD), and healthy non-trauma-exposed control subjects. Participants completed the Autobiographical Memory Test, Autobiographical Memory Interview (counterbalanced), Impact of Event Scale-Revised, Beck… (More)

- Ahmad Abdi, Andreas Emil Feldmann, Bertrand Guenin, Jochen Könemann, Laura Sanità
- SIAM J. Discrete Math.
- 2016

In the directed Steiner tree problem, we are given a digraph, nonnegative arc weights, a subset of vertices called terminals, and a special terminal called the root. The goal is to compute a minimum weight directed tree that connects each terminal to the root. We study the classical directed cut linear programming (LP) formulation which has a variable for… (More)

- Ahmad Abdi, Bertrand Guenin
- IPCO
- 2017

Let F be a binary clutter. We prove that if F is non-ideal, then either F or its blocker b(F) has one of L7,O5,LC7 as a minor. L7 is the non-ideal clutter of the lines of the Fano plane, O5 is the non-ideal clutter of odd circuits of the complete graph K5, and the two-point Fano LC7 is the ideal clutter whose sets are the lines, and their complements, of… (More)

- Ahmad Abdi, H. Nejat Pishkenari, Ramtin Keramati, Majid Minary-Jolandan
- Nanotechnology
- 2015

Atomic force microscopy (AFM), as an indispensable tool for nanoscale characterization, presents major drawbacks for operation in a liquid environment arising from the large hydrodynamic drag on the vibrating cantilever. The newly introduced 'Trolling mode' (TR-mode) AFM resolves this complication by using a specialized nanoneedle cantilever that keeps the… (More)

For an integer n ≥ 3, the clutter ∆n := { {1, 2}, {1, 3}, . . . , {1, n}, {2, 3, . . . , n} } is called a delta of dimension n, whose members are the lines of a degenerate projective plane. In his seminal paper on non-ideal clutters, Alfred Lehman manifested the role of the deltas as a distinct class of minimally non-ideal clutters [DIMACS, 1990]. A clutter… (More)

In this paper we will establish some identities involving sums of reciprocals<lb>of single binomial coefficients. We will subsume and extend some results obtained by<lb>Sury Wang and Zhao; furthermore we shall give bounds on some resulting series which<lb>depend on several parameters. We then extend the results to obtain identities for sums<lb>of… (More)

For a clutter C over ground set E, a pair of distinct edges e, f ∈ E are coexclusive if every minimal cover contains at most one of them. An identification of C is another clutter obtained after identifying coexclusive edges of C. If a clutter is non-packing, then so is any identification of it. Inspired by this observation, and impelled by the lack of a… (More)

- Ahmad Abdi, Bertrand Guenin
- IPCO
- 2014

A binary clutter is cycling if its packing and covering linear program have integral optimal solutions for all Eulerian edge capacities. We prove that the clutter of odd stwalks of a signed graph is cycling if and only if it does not contain as a minor the clutter of odd circuits of K5 nor the clutter of lines of the Fano matroid. Corollaries of this result… (More)

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