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We have used the smoothed particle hydrodynamics (SPH) code GADGET-2 to simulate the formation of an elliptical galaxy in a group-size cosmological dark matter halo with mass Mhalo ≃ 3× 10 12 h −1 M⊙ at z = 0. The use of a stellar population synthesis model has allowed us to compute magnitudes, colours and surface brightness profiles. We have included a model to follow the growth of a central b...

This paper presents a tracking algorithm for the adaptive control of nonlinear dynamic systems represented in Strict Feedback Form with parametric uncertainty. The construction of the stabilizing algorithm is given using Passivity-based arguments that result in an Adaptive Passivity-Based Controller (APBC). The construction of the controller results in a chain of interconnected subsystems with ...

W study a seller that starts with an initial inventory of goods, has a target horizon over which to sell the goods, and is subject to a set of financial milestone constraints on the revenues and sales that need to be achieved at different time points along the sales horizon. We characterize the revenue maximizing dynamic pricing policy for the seller and highlight the effect of revenue and sale...

This paper addresses output regulation problem for general linear systems subject to input saturation by composite nonlinear feedback (CNF) control. The CNF control law is constructed based on a switch control law which solves the output regulation problem by introducing a nonlinear feedback part. The purpose of the nonlinear feedback part is to improve the transient performance of the output r...

The extraordinary conditions in the financial world of late 2008 caused severe market dislocations and consequently many asset managers experienced significant portfolio losses, partly due to ineffective hedging techniques. In order to examine the effect of the credit crisis on investment strategies, we create a diverse set of long-short equity portfolios with domestic equity sectors and an arr...

We initiate the study of public-key encryption (PKE) secure against selective-opening attacks (SOA) inthe presence of randomness failures, i.e., when the sender may (inadvertently) use low-quality randomness. Inthe SOA setting, an adversary can adaptively corrupt senders; this notion is natural to consider in tandemwith randomness failures since an adversary may target senders b...

In this article we study an optimal stopping/optimal control problem which models the decision facing a risk averse agent over when to sell an asset. The market is incomplete so that the asset exposure cannot be hedged. In addition to the decision over when to sell, the agent has to choose a control strategy which corresponds to a feasible wealth process. We formulate this problem as one involv...

This study investigates the effect of four types of oral corrective feedback, namely, explicit elicitation, implicit elicitation, explicit recast and implicit recast on the most commonly mispronounced phonological features among Iranian EFL learners through immediate uptake and retention. Five classes were randomly categorized into four experimental groups and one control group, each with 18 in...

Based on the controversial beliefs among L2 teachers about effective corrective feedback (CF) strategies, recast and prompts as 2 kinds of CF have drawn the attention of L2 researchers(e.g., Braidi, 2002; Iwashita, 2003; Loewen & Philp, 2006; Panova & Lyster, 2002; Sheen, 2004). Despite these numbers of studies, debate continues to exist about their usefulness as a CF technique. Whereas recasts...