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We consider the following problem: given a k-(node) connected graph G find a smallest set F of new edges so that the graph G + F is (k + 1)-connected. The complexity status of this problem is an open question. The problem admits a 2-approximation algorithm. Another algorithm due to Jordán computes an augmenting edge set with at most (k − 1)/2 edges over the… (More)

- Gilad Liberman, Jennifer Benichou, Lea Tsaban, Jacob Glanville, Yoram Louzoun
- Front. Immunol.
- 2013

AFFINITY MATURATION OCCURS THROUGH TWO SELECTION PROCESSES
the choice of appropriate clones (clonal selection), and the internal evolution within clones, induced by somatic hyper-mutations, where high affinity mutants are selected for. When a final population of immunoglobulin sequences is observed, the genetic composition of this population is affected by… (More)

Compartmental modeling is a widely used tool in neurophysiology but the detail and scope of such models is frequently limited by lack of computational resources. Here we implement compartmental modeling on low cost Graphical Processing Units (GPUs), which significantly increases simulation speed compared to NEURON. Testing two methods for solving the… (More)

- Gilad Liberman, Yoram Louzoun, Dafna Ben Bashat
- Journal of magnetic resonance imaging : JMRI
- 2014

PURPOSE
To improve the calculation of T1 relaxation time from a set of variable flip-angle (FA) spoiled gradient recalled echo images.
MATERIALS AND METHODS
The proposed method: (a) uses a uniform weighting of all FAs, (b) takes into account global inaccuracies in the generation of the prescribed FAs by estimating the actual FAs, and (c) incorporates… (More)

- Gilad Liberman, Yoram Louzoun, Moran Artzi, Guy Nadav, James R Ewing, Dafna Ben Bashat
- Magnetic resonance imaging
- 2016

Dynamic contrast enhanced (DCE) MRI using Tofts' model for estimating vascular permeability is widely accepted, yet inter-tissue differences in bolus arrival time (BAT) are generally ignored. In this work we propose a method, incorporating the BAT in the analysis, demonstrating its applicability and advantages in healthy subjects and patients. A method for… (More)

- Gilad Liberman, Jennifer I C Benichou, Yaakov Maman, Jacob Glanville, Idan Alter, Yoram Louzoun
- Nucleic acids research
- 2016

Incremental selection within a population, defined as limited fitness changes following mutation, is an important aspect of many evolutionary processes. Strongly advantageous or deleterious mutations are detected using the synonymous to non-synonymous mutations ratio. However, there are currently no precise methods to estimate incremental selection. We here… (More)

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