Search results for "OPERATIONS"
showing 10 items of 1692 documents
Rappresentare, referenziare e regolare. Su tre invarianti costitutivi della natura umana
2009
The paper aims to analyze three distinct but related language operations: representation, referentiation, regulation.
Hybridizing large neighborhood search and exact methods for generalized vehicle routing problems with time windows
2021
International audience; Delivery options are at the heart of the generalized vehicle routing problem with time windows (GVRPTW) allowing that customer requests are shipped to alternative delivery locations which can also have different time windows. Recently, the vehicle routing problem with delivery options was introduced into the scientific literature. It extends the GVRPTW by capacities of shared locations and by specifying service-level constraints defined by the customers' preferences for delivery options. The vehicle routing problem with delivery options also generalizes the vehicle routing problem with home roaming delivery locations and the vehicle routing problem with multiple time…
The Latent Factors Behind the Urban Travel Behaviour
2014
Abstract This research aims to explore the impact of latent variables, mirroring the users’ preferences, on the individual decision making process regarding the mode of transport. The paper describes the first results of an ongoing research activity, which derives from a pilot study carried out in Palermo. The authors have administered to a sample of travellers a questionnaire and they simulated the mode choice behaviour referring to the random utility theory. Then the transport demand over the entire area of Palermo has been studied in order to design the cordon pricing scenario with the application of an additional cost on private car dedicated to a selected area of the historic centre of…
Fuzzy Methods and Approximate Reasoning in Geographical Information Systems
2014
This issue has been dedicated to the usage of fuzzy logic in the context of Geographical Information Systems (GIS) and were receveid the following papers whose contents are described below: - in the paper of A. Hofmann, S. Hoskova-Mayerova, and V. Talhofer, the authors use a GIS tool which is useful to study the influence of geographic and climatic factors on the terrain passability of armed forces and the Integrated Rescue System. - In the first paper of S. Sessa and F. Di Martino, the authors propose the usage of the well known Extended Gustafson-Kessel clustering method, encapsulated in a GIS tool, for detecting hotspots in spatial analysis. The data consist of geo-referenced patterns co…
Monitoring and prediction in early warning systems for rapid mass movements
2015
Rapid mass movements (RMM) pose a substantial risk to people and infrastructure. Reliable and cost-efficient measures have to be taken to reduce this risk. One of these measures includes establishing and advancing the state of practice in the application of early warning systems (EWSs). EWSs have been developed during the past decades and are rapidly increasing. In this paper, we focus on the technical part of EWSs, i.e., the prediction and timely recognition of imminent hazards, as well as on monitoring slopes at risk and released mass movements. Recent innovations in assessing spatial precipitation, monitoring and precursors of the triggering and deformation of RMM offer new opportunities…
Towards automatic calibration of 2-D flood propagation models
2010
Abstract. Hydraulic models for flood propagation description are an essential tool in many fields and are used, for example, for flood hazard and risk assessments, evaluation of flood control measures, etc. Nowadays there are many models of different complexity regarding the mathematical foundation and spatial dimensions available, and most of them are comparatively easy to operate due to sophisticated tools for model setup and control. However, the calibration of these models is still underdeveloped in contrast to other models like e.g. hydrological models or models used in ecosystem analysis. This has two primary reasons: first, lack of relevant data against which the models can be calibr…
Sustainable vehicle routing based on firefly algorithm and TOPSIS methodology
2019
Abstract In a sustainable management of logistics, transportation plays a crucial role. Traditionally, the main purpose was to solve the Vehicle Routing Problem minimizing the cost associated with the travelled distances. Nowadays, the economic profit cannot be the only driver for achieving sustainability and environmental issues have to be also considered. In this paper, to satisfy the intricate limits involved in real vehicle routing problem, the study has been structured considering different types of vehicles in terms of maximum capacity, velocity and emissions, asymmetric paths, vehicle-client constraints and delivery time windows. The firefly algorithm has been implemented to solve th…
Surgical learning and guidance on operative risks and potential errors
2017
Purpose Within the framework of learning from errors, this study focused on how operative risks and potential errors are addressed in guidance to surgical residents during authentic surgical operations. The purpose of this paper is to improve patient safety and to diminish medical complications resulting from possible operating errors. Further in the process of the optimal contexts for instruction aimed at preventing risks and errors in the practical hospital environment was evaluated. Design/methodology/approach The five authentic surgical operations were analyzed, all of which were organized as training sessions for surgical residents. The data (collected via video-recoding) were analyze…
The Impacts of LBOs on the Performance of Acquired Firms: The French Case
2002
This paper investigates the financial characteristics and changes in performance of French companies involved in a leveraged buy-out. The empirical study covers a sample of 161 MBOs in France from 1988 to 1994. The acquired firms outperform their counterparts in the same sector of activity before and after the buy-out. However, unlike findings concerning LBOs in the USA and the UK, the performance of French firms falls after the operation is completed. This downturn in performance seems to be less detrimental to former subsidiaries of groups than to former family businesses.
Exploring the Shift from Output Measures to Outcome Measures of Service Delivery: Insights from Municipal Research
2021
Prior research shows that reporting on outcome measures increases the probability that local officials will use perform- ance data to inform their decisions. What has been over- looked in the literature is the question of why some local governments continue to focus more on outputs than on out- comes of service delivery, thereby limiting their ability to use performance data for decision-making. The purpose of this art- icle is to identify organizational, individual, and support factors that could increase the probability that local officials in the Apulia Region of Italy when measuring performance, will move beyond the basic measures of output to the more advanced measures of outcome. Base…