Let f : 2 → R be a non-decreasing submodular set function, and let (N, I) be a matroid. We consider the problem maxS∈I f(S). It is known that the greedy algorithm yields a 1/2-approximation [9] for this problem. It is also known, via a reduction from the max-k-cover problem, that there is no (1− 1/e+ )-approximation for any constant > 0, unless P = NP [6]. In this paper, we improve the 1/2-appr...

Drug-induced torsades de pointes (TdP) is common with class III antiarrhythmic drugs. Increased transmural dispersion of repolarization (TDR) contributes significantly to the development of TdP. Gap junctions play an important role in maintaining TDR in long QT syndrome. The present study examined the effect of a gap junction enhancer, antiarrhythmic peptide 10 (AAP10), on ibutilide-induced TdP...

The authors examine e-tutor perceptions of the star rural area e-learning project, service learning. The study employed 125 volunteer e-tutors twice per week for one semester. A survey found that e-tutors had the most positive perceptions towards teaching preparation. The results showed that only e-tutors from different grades reflected various perceptions of the star rural area e-learning proj...

1. What are the important gaps between evidence and clinical practice identified in the networks area of interest? .......................................................... 2 2. What is the gap between evidence and practice that the network would propose to address first?..................................................................................... 2 a) What is the best available eviden...

This paper presents a comparative study among default implementations of Genetic Algorithm, Differential Evolution and Particle Swarm Optimization for load balancing, a specific case of the Generalized Assignment Problem (GAP). Differential Evolution was found the best algorithm, and it was further tested with harder GAP instances to determine its best configuration, so as to be applied to othe...

We analyse the behavior of the density of states in a singlet s-wave superconductor with weak magnetic impurities in the clean limit by using the method of optimal fluctuation. We show that the density of states varies as lnN(E) ∝ −|E −∆0| near the mean field gap edge ∆0 in a d-dimensional superconductor. The optimal fluctuation in d > 1 is strongly anisotropic. We compare the density of states...

An edge-modified tight-binding (TB) approximation has been developed, enabling us to clarify the energetic origin of the width-dependent band gap (E(G)) expansion of the armchaired and the reconstructed zigzag-edged graphene nanoribbons with and without hydrogen termination. Consistency between the TB and the density-function theory calculations affirmed that: (i) the E(G) expansion originates ...

Problem-Based Learning (PBL) is a learning technique that involves learners with problem-solving skills and it is known to motivate learners to collaborate among themselves to work together for the best solution. This technique requires effective social interaction in order to produce the best outcome from each discussion in the learning process. Social interaction issue becomes more interestin...

Given a graph G = ([n], E) and w ∈ R , consider the integer program maxx∈{±1}n ∑ ij∈E wijxixj and its canonical semidefinite programming relaxation max ∑ ij∈E wijv T i vj , where the maximum is taken over all unit vectors vi ∈ R. The integrality gap of this relaxation is known as the Grothendieck constant κ(G) of G. We present a closed-form formula for the Grothendieck constant of K5-minor free...