Showing papers in "Operations Research Letters in 2001"

TL;DR: Knowledge of the natural history of various neoplasms and the factors that contribute to distant metastases as well as good judgement are essential for cost-effective treatment planning and decision-making with regard to pre- and postoperative evaluation for distant metastasing in cancer of the head and neck.

TL;DR: A fully polynomial approximation scheme for the restricted shortest path problem, which improves Hassin's original result and achieves time complexity of O(|E|n(loglog(UB/LB)+1/@e)), where UB and LB are upper and lower bounds for the problem.

TL;DR: The robust spanning tree problem is defined to hedge against the worst case contingency, some useful optimality concepts are defined, and characterizations for these entities leading to polynomial time recognition algorithms are presented.

TL;DR: The incidence of distant metastases is very high in patients with anaplastic thyroid cancer, but most of the time the outcome depends on the locoregional recurrence and massive disease in the central compartment, but the most common site is the lung.

TL;DR: It is recommended that all patients who have a malignant salivary gland tumor treated, any histology, should be followed up and clinically assessed at least once every 12 months for life.

TL;DR: This paper proposes a new pedagogically simpler modification of the standard text-book modeling strategy that constructs its convex hull representation, thereby rendering it locally ideal and exhibits a nonsingular linear transformation that equivalently converts the proposed model into Padberg's formulation.

TL;DR: The suggested posttreatment work-up for early diagnosis of these salvageable patients is clinical and fiberscopic evaluation every 3 months for 2 years and later on every 6 months; skull base and neck MRI or CT scan, and chest CT scan at 6, 12, 18, 24, 36, 48 and 60 months; EBV serological evaluation.

TL;DR: This paper compares the elementary closures arising from several classical families of cuts, including Gomory's fractional cuts, three versions of Gomary's mixed integer cuts, two versions of intersection cuts and their strengthened forms, Chvatal cuts, MIR cuts, lift-and-project cuts without and with strengthening, and Lovasz-Schrijver cuts with positive semi-definiteness constraints.

TL;DR: A class of facet-defining inequalities for the single node fixed-charge flow polytope is presented and a comparison of valid inequalities for this polytopes is provided to show the effectiveness of these inequalities in solving fixed- charge network flow problems.

TL;DR: A collection of previously established results which show that the general problem is solvable in polynomial time are presented and may serve as a useful guide to the literature, since thisPolynomial-time solvability has been rediscovered in different contexts or using different methods.

TL;DR: A surprisingly simple and explicit expression for the waiting time distribution of the M/D/c queueing system is derived by a full probabilistic analysis, requiring neither generating functions nor Laplace transforms.

TL;DR: A branch-and-cut algorithm for the Maximum Cardinality Stable Set problem is proposed and a computational experience on the DIMACS benchmark graphs validates the effectiveness of the approach.

TL;DR: It is shown that contrary to various other scheduling problems, in this environment a set of dominant schedules cannot be calculated efficiently with list scheduling techniques.

TL;DR: The data indicate that loss of olfactory sensitivity in humans may be associated with a decreased sensitivity towards trigeminal stimuli and alteration of intranasal trigeminals function is stronger in patients with posttraumatic anosmia compared to patients with sinonasal disease.

TL;DR: It was concluded that tympanoscope-assisted myringoplasty is a reliable and simple procedure with the benefit of minimal trauma in healthy tissue and that it is a feasible approach for day-case surgery with an ordinary success rate of tympanic membrane closure and hearing results.

TL;DR: This technique provides satisfactory results both in the success rate of perforation closure and in hearing outcome, and is concluded to be a suitable technique for minimally invasive myringoplasty.

TL;DR: A meta-analysis of variables which predispose to a higher incidence of distant metastases indicate that tumor location (hypopharynx > larynx), advanced primary disease (T3 + T4), regional disease (N+), locoregional recurrences, and advanced regional metastases (N2 + N3) are statistically significant.

TL;DR: Patients with lip and oral cavity can be divided into a group where the risk of distant metastases is low, and into a high-risk one, and the best treatment consists of a positron emission tomography scan.

TL;DR: It is shown that ''most representative efficient points'' can be found using a direct approach and may differ from those obtained by MS-DEA and remains very attractive in view of its economic (intsic price) legitimation.

TL;DR: It is concluded that this minimal invasive method of local botulinum toxin application might be a very effective and safe option for the treatment of nasal hypersecretion of different etiologies.

TL;DR: A strong in-approximability result is proved with respect to polynomial time bicriteria approximation algorithms for this discrete version of the well-known time-cost tradeoff problem for project networks.

TL;DR: It is shown that if H has a superlinear (quadratic) approximate property at ([email protected]?,[email protected]?), then G has asuperlinear (quantum) approximation property at [email Protected]? This result is useful in designing Newton's methods for nonsmooth equations.

TL;DR: It appears that after switching over from the CIS PRO+ to the TEMPO+, subjects are able to maintain or even improve their own speech understanding capability.

TL;DR: MRI does not appear as a likely replacement for second-look surgery in cases of intact canal wall tympanoplasty and the correlation rates between the two sets of findings indicate that 30% of the MRI findings were incorrect.

TL;DR: An implementable algorithm is obtained that converges to a strong stationary point of the original bilevel program by coupling the concepts of trust region and linesearch in a novel way.

TL;DR: Using [18F]FDG PET, the main proliferation centers of inhomogeneous squamous-cell carcinomas could be identified with possible clinical implications for patient management and confirm previous clinical and histologic observations thatSquamous- cell carcinomas of the upper digestive tract are heterogeneous tumors.

TL;DR: Whereas crosssections through the ampullary region and the adjoining utricle showed no abnormalities, there were significant structural changes in the semicircular canals, which are able to provide an explanation for the symptoms of a heavy cupula.

TL;DR: A two-machine open shop scheduling problem, in which one machine is not available for processing during a given time interval, is studied and an approximation algorithm with a worst-case ratio of 43.5 is presented.

TL;DR: The VEMPs of the 3 patients diagnosed as IBV revealed that IBV affects not only the superior but also the inferior vestibular nerve systems, and VEMP could be useful for classifying IBV according to the function of the inferior Vestibular nerves.