This work proposes a novel direct-detection polarization division multiplexed OFDM scheme without the need of dynamic polarization control at a polarization-diverse receiver, and the proposed scheme is robust against polarization mode dispersion. Setting the frequency difference between two polarization-orthogonal reference carriers as one subcarrier spacing, possible signal fading can be avoid...

We explore a variation of Jouppi's stream buuers scheme that reduces the memory stall time by prefetching lines on cache misses. In Jouppi's scheme since the stream buuers are oo-chip, a penalty is incurred even when the required line is available in the stream buuers. We propose moving the stream buuers on-chip to reduce this penalty. Also a line that hits in the stream buuer is not moved into...

We propose an augmented Lagrangian algorithm for solving large-scale equality constrained optimization problems. The novel feature of the algorithm is an adaptive update for the penalty parameter motivated by recently proposed techniques for exact penalty methods. This adaptive updating scheme greatly improves the overall performance of the algorithm without sacrificing the strengths of the cor...

This paper is concerned with solving nonconvex learning problems with folded concave penalty. Despite that their global solutions entail desirable statistical properties, there lack optimization techniques that guarantee global optimality in a general setting. In this paper, we show that a class of nonconvex learning problems are equivalent to general quadratic programs. This equivalence facili...

In this article we address the problem of scheduling on realistic high performance computing facilities using incomplete information about tasks execution times. We introduce a variation of our previous Penalty Scheduling Policy, including an aging scheme that increases the priority of jobs over time. User-provided runtime estimates are applied as in the original Penalty Scheduling Policy, but ...

We introduce stable multi-domain spectral penalty methods suitable for solving fractional partial differential equations with fractional derivatives of any order. The fractional derivative is approximated in each sub domain using orthogonal polynomials and stability of the scheme is achieved through weakly imposed boundary and interface conditions by using a penalty term. We discuss accuracy an...

backgrounds and aims: characteristic property among tehran offensive and non- offensive drivers using cloninger , s treatment and character inventory questionnaire was studied. materials and methods: a cross- sectional study was carried out after coordinating with traffic police. 300 drivers: 150 offensive ( drivers with more than ten penalty points and 150 non- offensive drivers with less than...