Showing papers in "Operations Research Letters in 2012"

TL;DR: The piecewise linear approximation and the piecewise tangent approximation is used to approximate the stochastic linear programs with two second-order cone programming (SOCP for short) problems.

TL;DR: It is shown that any (nonconvex) quadratically constrained quadratic program (QCQP) can be represented as a generalized copositive program, and two representations are provided: one based on the concept of completely positive (CP) matrices over second-order cones, and onebased on CPMatrices over the positive semidefinite cone.

TL;DR: In this article, an assortment and price optimization problem where a retailer chooses an assortment of competing products and determines their prices to maximize the total expected profit subject to a capacity constraint is considered.

TL;DR: Time consistency of risk averse multistage stochastic programming problems is discussed, in a framework of finite scenario trees, that composition of law invariant coherent risk measures can be law invincible only for the expectation or max-risk measures.

TL;DR: In this article, a retrospective review of patients with tongue carcinoma who underwent curative surgery between 2002 and 2005; 67 patients were analyzed and divided into two groups: group A = invasion depth and group B = invasion width.

TL;DR: Subjective evaluation demonstrates strong user preferences for FSP when listening to speech and music, and indicates that FSP performs better than CIS+ in vowel and monosyllabic word understanding.

TL;DR: This limit provides support for a previously proposed deterministic fluid approximation, and extends a previously established limit for the special case of exponential service times.

TL;DR: The results show that using trade credit can coordinate the supply chain in the case of asymmetric information, and the buyer benefits from trade credit; but unfortunately, the supply network does not coordinate.

TL;DR: By using Moore's subtraction operator and an introduced total order with respect to the set of closed intervals, new notions of interval cores and Shapley-like values are introduced and relations between them and the existing interval solutions are discussed.

TL;DR: A joint inventory and pricing model of a single product over a finite planning horizon with deterministic demand with polynomial time algorithms to maximize the total profit is analyzed.

TL;DR: Endoscopic endonasal resection of TSMs appears to be a comparable alternative to traditional open microsurgical resection with respect to overall quality of life (QOL) based on available publications.

TL;DR: Stonasal IP with attachment to the anterior medial portion of the maxillary sinus can be treated successfully using modified endoscopic maxillary medial sinusotomy with preservation of the nasolacrimal duct and inferior turbinate.

TL;DR: A Model of Transfer Tax (MTT) is proposed which incorporates a typical Stackelberg game between the administrator and individual region of a river basin, which serves as an ecological compensation standard that enhances cooperation on pollution reduction among the regions.

TL;DR: Results on rates of convergence for problems with mixed-integer bounded sets of feasible solutions and several chance constraints are extended and an application to a vehicle routing problem with time windows, random travel times, and random demand is presented.

TL;DR: The Stochastic Dual Dynamic Programming algorithm can be used to obtain approximations of the corresponding risk-averse recourse functions of multistage stochastic linear programs, and it is shown that some cut coefficients have analytic formulas.

TL;DR: Two polynomial time algorithms for the constant capacitated lot sizing problem with a batch production are presented and several optimality properties for the general problem are given.

TL;DR: To allocate the firm-wide profit between upstream and downstream divisions, a cooperative game is constructed, the convexity of the game is shown, and the Shapley value-based transfer prices for the firm are computed.

TL;DR: This review of the regulation of TGF-β1 activation and expression provides insight into the mechanism responsible for the different CRS subtypes, which will help further the investigation of novel therapy targets for the treatment of CRS.

TL;DR: It is shown that marginal dual representations of multiple optimal stopping problems can be derived in a simple unified manner using the general duality theory based on information relaxations that was developed independently by Brown, Smith and Sun (2010) and Rogers (2007).

TL;DR: A model of an impulse control problem when the controller's action affects the state as well as the dynamics of the state process for a random amount of time is applied.

TL;DR: This paper establishes exact SDP relaxations for classes of nonlinear semidefinite programming problems with SOS-convex polynomials and derives numerically checkable conditions, completely characterizing minimizers of these classes of problems.

TL;DR: Using value-function and gradient methods, two dual optimal penalties are derived for the LQ problem for when the control space is unconstrained that may be used to evaluate sub-optimal policies for constrained LQ problems.

TL;DR: A probabilistic version of the Markowitz portfolio problem with proportional transaction costs is proposed, and the second-order cone formulation in which the number of quadratic terms is invariant to thenumber of assets is the most efficient.

TL;DR: Overexpression of CD24 in LSCC is associated with invasiveness, metastatic potential and high tumor proliferation status and may be a promising strategy for the future treatment of LSCC metastasis and recurrence.

TL;DR: This work studies the problem of scheduling the charging process in a BSS with the objective of optimizing a weighted measure of service level and cost.

TL;DR: It was seen that hypopharyngeal area often contributes to obstruction and some examination methods correlate more with AHI, which can aid sleep physicians in the evaluation of OSA patients.

TL;DR: Cyst formation is a crucial factor for surgical outcome of large or giant vestibular schwannomas via a translabyrinthine approach and with near total or subtotal tumor removal, worse functional outcomes in large or Giant VSs should be foreseen.

TL;DR: The dichotomous classification of homogeneity leukoplakia by NBI is meaningful, and endoscopy with the NBI system is a promising tool for the evaluation and management of homogeneous oral leukplakia.

TL;DR: A multi-stage stochastic program that provides a lower bound on the long-run average inventory cost of a general class of assemble-to-order (ATO) inventory systems and shows that these sufficient conditions hold for two examples, a single product system and a special case of the generalized W model.

TL;DR: Heuristics to speed-up the strong branching computation, and also to reduce the set of candidate branching variables by removing the variables whose fractionality is just chimerical, in the sense that it can be xed by allowing for a little worsening of the objective function.