An Integrated Approach to Single-Leg Airline Revenue Management: The Role of Robust Optimization

In this paper we introduce robust versions of the classical static and dynamic single leg seat allocation models as analyzed by Wollmer, and Lautenbacher and Stidham, respectively. These robust models take into account the inaccurate estimates of the underlying probability distributions. As observed by simulation experiments it turns out that for these robust versions the variability compared to their classical counter parts is considerably reduced with a negligible decrease of average revenue.Robust Optimization;Dynamic Models;Single-Leg Problems;Static Models;Airline Revenue Management

An integrated approach to single-leg airline revenue management: The role of robust optimization

In this paper we introduce robust versions of the classical staticand dynamic single leg seat allocation models as analyzed byWollmer, and Lautenbacher and Stidham, respectively. These robustmodels take into account the inaccurate estimates of the underlyingprobability distributions. As observed by simulation experiments itturns out that for these robust versions the variability compared totheir classical counter parts is considerably reduced with anegligible decrease of average revenue.dynamic models;robust optimization;static models;airline revenue management;single-leg problems

Recursive Approximation of the High Dimensional max Function

An alternative smoothing method for the high dimensional max functionhas been studied. The proposed method is a recursive extension of thetwo dimensional smoothing functions. In order to analyze the proposedmethod, a theoretical framework related to smoothing methods has beendiscussed. Moreover, we support our discussion by considering someapplication areas. This is followed by a comparison with analternative well-known smoothing method.n dimensional max function;recursive approximation;smoothing methods;vertical linear complementarity (VLCP)

Generalized Fractional Programming With User Interaction

The present paper proposes a new approach to solve generalized fractional programming problems through user interaction. Capitalizing on two alternatives, we review the Dinkelbach-type methods and set forth the main difficulty in applying these methods. In order to cope with this difficulty, we propose an approximation approach that can be controlled by a predetermined parameter. The proposed approach is promising particularly when a decision maker is involved in the solution process and agrees upon finding an effective but nearoptimal value in an efficient manner. The decision maker is asked to decide the parameter and our analysis shows how good is the value found by the approximation corresponding to this parameter. In addition, we present several observations that may be suitable for boosting up the performance of the proposed approach. Finally, we support our discussion through extensive numerical experiments

In-plane elastic wave propagation and band-gaps in layered functionally graded phononic crystals

AbstractIn-plane wave propagation in layered phononic crystals composed of functionally graded interlayers arisen from the solid diffusion of homogeneous isotropic materials of the crystal is considered. Wave transmission and band-gaps due to the material gradation and incident wave-field are investigated. A classification of band-gaps in layered phononic crystals is proposed. The classification relies on the analysis of the eigenvalues of the transfer matrix for a unit-cell and the asymptotics derived for the transmission coefficient. Two kinds of band-gaps, where the transmission coefficient decays exponentially with the number of unit-cells are specified. The so-called low transmission pass-bands are introduced in order to identify frequency ranges, in which the transmission is sufficiently low for engineering applications, but it does not tend to zero exponentially as the number of unit-cells tends to infinity. A polyvalent analysis of the geometrical and physical parameters on band-gaps is presented

An Integrated Approach to Single-Leg Airline Revenue Management: The Role of Robust Optimization

In this paper we introduce robust versions of the classical static and dynamic single leg seat allocation models as analyzed by Wollmer, and Lautenbacher and Stidham, respectively. These robust models take into account the inaccurate estimates of the underlying probability distributions. As observed by simulation experiments it turns out that for these robust versions the variability compared to their classical counter parts is considerably reduced with a negligible decrease of average revenue

Wildfire evidence from the Middle and Late Permian Hanxing Coalfield, North China Basin

Earth has a long geological history and palaeo-wildfire is one of the key factors which is responsible for the evolution and extinction of our earth systems. Thus, it is important to establish the history in order to gain more understanding about Permian-Triassic mass extinction. It is also related to the carbon cycle of the earth in which the whole life system depends. The objective of this paper is to evaluate the product of wildfire in terms of distribution and occurrences from the Late Permian North China basin. Hence, fourteen (14) rock samples were collected from a drill core of Hanxing Coalfield of North China basin. The samples were analyzed by macro and micro petrography, scanning electron microscopy (SEM), gas chromatography (GC), and gas chromatography-mass spectrometry (GC-MS) in order to study the evidence of wildfire. Charcoal (inertinite) particles are observed in the samples, which established the occurrences of wildfire during the Upper Middle and Late Permian time in North China. Additionally, high-molecular-weight polycyclic aromatic hydrocarbons (PAHs) were detected in the studied samples which also reinforce the presence of palaeo - wildfire events in the North China basin in Late Permian due to the fact that the these aromatic compounds were formed under high temperatures

Wildfire evidence from the Middle and Late Permian Hanxing Coalfield, North China Basin

Earth has a long geological history and palaeo-wildfire is one of the key factors which is responsible for the evolution and extinction of our earth systems. The most important extinction of our earth systems is the Permian-Triassic mass extinction. The objective of this paper is to evaluate the product of wildfire in terms of distribution and occurrences from the Late Permian North China basin. Fourteen rock samples were collected from a drill core of Hanxing Coalfield of North China basin. The samples were analyzed by macro and micro petrography, Scanning Electron Microscopy (SEM), Gas Chromatography (GC) and Gas Chromatography–Mass Spectrometry (GC-MS) in order to study the evidence of wildfire. Charcoal (inertinite) particles are observed in the samples, which established the occurrences of wildfire during the upper Middle and Late Permian time in North China. Additionally, high-molecular-weight Polycyclic Aromatic Hydrocarbons (PAHs) were detected in the studied samples which also reinforce the presence of palaeo–wildfire events in the North China basin in Late Permian due to the fact that these aromatic compounds were formed under high temperatures

Recursive Approximation of the High Dimensional max Function

An alternative smoothing method for the high dimensional max function has been studied. The proposed method is a recursive extension of the two dimensional smoothing functions. In order to analyze the proposed method, a theoretical framework related to smoothing methods has been discussed. Moreover, we support our discussion by considering some application areas. This is followed by a comparison with an alternative well-known smoothing method

Психологические особенности самореализации китайских женщин

The article analyzes the results of the empirical study of self-realization of an individual. The study was performed on the Chinese respondents in the frame of the polysystemic concept of self-realization of the personality.В статье анализируются результаты эмпирического исследования самореализации личности. Исследование выполнено на китайских респондентах в рамках полисистемной концепции самореализации личности