Search results for "CONSISTENCY"

The collaborative consistent vehicle routing problem with workload balance

2021

Abstract The rising competition in the logistics sector forces companies to be more economically efficient. One of the major sources of inefficiency is the incomplete usage of available resources, such as vehicles’ capacities. Mechanism that allow to better exploit such resources by enabling carrier collaborations are on the rise. Our study examines a centrally organized multi-period collaborative vehicle routing problem, where carriers can exchange customers who have to be serviced on a regular basis. Collaborations, where carriers serve frequent customers, are supposed to face the problem of (i) time consistency in terms of visiting time, and of (ii) service consistency. The latter ensure…

Service characteristics as moderators of the entry mode choice: empirical evidence in the hotel industry

2012

Although a considerable amount of research has explored the entry mode choice, results regarding the direct influence of some variables on the entry mode choice evince a lack of a clear consistency. By introducing the moderator effect of the nature of the services being provided by the firm, we explain some of these inconclusive results. We use a comprehensive database on the Spanish hotel industry which covers nearly all the operations carried out by the majority of Spanish hotel chains up to 2011. We found that both intangibility and complexity of the services offered by the hotel moderate the relationship between environmental uncertainties and entry mode choice by increasing the propens…

Vehicle scheduling for rental-with-driver services

2021

Abstract In this paper, we introduce a new vehicle scheduling problem (VSP) with driver consistency faced by rental-with-driver companies. A weekly time-horizon is considered and a set of potential customers, each one associated with a list of required tasks, is assumed. The company can choose to accept or reject a customer, but if accepted, all required tasks must be performed by the same driver. A profit is associated with each customer. The goal is to maximize the company’s total profit, by respecting a list of daily and the weekly drivers’ workload limitations imposed by drivers’ contracts. We propose a mathematical formulation of the problem and design an exact solution method based on…

Mobile Mapping System: case study of the Messina-Palermo motorway layout

2009

This paper presents the first results of the MMS (Mobile Mapping System) survey on the geometry of the A20 italian motorway Messina-Palermo. The layout parameters are the essential data for an effective management of a single or a road network. In particular these parameters are essential for applying the Design Consistency methodology to proposed or existing road infrastructures; through this methodology the road manager can make sure that the road characteristics are adjusted to the driving behaviour of motorists by analysing the relationship between horizontal and vertical alignment and the design and operating speed. Both the difficult finding of the road design schemes, particularly in…

Sine cura. Verso il ri-ciclo dell'architettura del secondo Novecento

2019

Gli argomenti discussi nel saggio interrogano il destino che il Codice dei Beni Culturali (2004- 2011) determina per le opere del secondo Novecento. Nella costruzione del futuro di questi manufatti, che per funzione, tecnologia e cicli d’uso sono spesso segnati dall’obsolescenza e dall’abbandono, le ambiguità e le incongruenze delle attuali procedure legislative sollecitano profondamente il ruolo culturale delle esperienze di ricerca che usano metodologie meta progettuali. Il confronto fra alcuni casi italiani ed altri europei rimarca il ruolo del progetto nella costruzione di una prospettiva di tutela trasformativa per il costruito del secondo Novecento. Nel quadro di azione marcato dall’o…

L’idealismo trascendente tra Cusano e Leibniz

2013

I aim at demonstrating how both Nicholas of Cusa and Leibniz glean from the platonic school of thought the idealistic notion of ‘truth as expression’, orienting it towards the singularity of being. I will also reveal a second assumption derived from the philosophia perennis by both thinkers: the idea of philosophy as hypothetic and intersubjective undertaking. The theoretical results of this philosophical conceptualization are formulated in the name of the Possibility rather than in the name of Necessity. Under this shared perspective, Nicholas and Leibniz interpret the substantial forms (formae substantiales) as “unities without plurality”. It follows that the dialectic subjects can only b…

Consistency Restoring in SPH for Trigonometric Functions Approximation

2009

An improved Smoothed Particle ElectroMagnetics method in 3D time domain simulations

2012

In this paper, an enhanced variant of the meshless smoothed particle electromagnetics (SPEM) method is performed in order to solve PDEs in time domain describing 3D transient electromagnetic phenomena. The method appears to be very efficient in approximating spatial derivatives in the numerical treatment of Maxwell's curl equations. In many cases, very often, accuracy degradation, due to a lack of particle consistency, severely limits the usefulness of this approach. A numerical corrective strategy, which allows to restore the SPEM consistency, without any modification of the smoothing kernel function and its derivatives, is presented. The method allows to restore the same order of consiste…

Economic Logic with Internal Consistency (and Not Only Formal Rigour)

2022

As is well known, during his life Sraffa never published a work explicitly devoted to epistemological issues. This fact should not be interpreted to indicate Sraffa’s lack of interest in such concerns. From Sraffa’s unpublished manuscripts – kept at the Wren Library of Trinity College, Cambridge, and from the books of his personal library – we see that Sraffa had a strong interest in questions of philosophy of 8science (Kurz and Salvadori, 2005). Therefore, a reconstruction of Sraffa’s epistemological theory can only be conjectural and must not leave out of consideration his unpublished manuscripts. In a previous work (Salvadori and Signorino, 2007), we analysed a specific aspect of Sraffa’…

Consistency of Carbopol 971-P NF gels and influence of soluble and cross-linked PVP.

2002

A study is made of the polymerization process of polyacrylic acid, commercially known as Carbopol® 971 NF, assessing its consistency as a function of the degree of neutralization at pH values from 3 to 12, approximately. Percentage concentrations ranging from 0.1 to 1.4% (w/w) were studied. The gels obtained were non-Newtonian, and pseudoplastic. As concentration and pH rise, the consistency of the gels increase to a maximum, which appears between pH 6 and 8, allowing their use as vehicles in bioadhesive formulations for mucosal application. Over the increasing viscosity interval, functions were obtained to indicate the consistency of the gel as a function of pH and concentration. Since the…