Search results for "vento"

On the Bullwhip Avoidance Phase: The Synchronised Supply Chain

2012

Abstract The aim of this paper is to analyse the operational response of a Synchronised Supply Chain (SSC). To do so, first a new mathematical model of a SSC is presented. An exhaustive Latin Square design of experiments is adopted in order to perform a boundary variation analysis of the main three parameters of the periodic review smoothing ( S ,  R ) order-up-to policy: i.e., lead time, demand smoothing forecasting factor, and proportional controller of the replenishment rule. The model is then evaluated under a variety of performance measures based on internal process benefits and customer benefits. The main results of the analysis are: (I) SSC responds to violent changes in demand by re…

The effect of inventory record inaccuracy in information exchange supply chains

2015

Abstract The goal of this paper is to quantify the impact of Inventory Record Inaccuracy on the dynamics of collaborative supply chains, both in terms of operational performance (i.e. order and inventory stability), and customer service level. To do so, we model an Information Exchange Supply Chain under shrinkage errors in the inventory item recording activity of their nodes, present the mathematical formulation of such supply chain model, and conduct a numerical simulation assuming different levels of errors. Results clearly show that Inventory Record Inaccuracy strongly compromises supply chain stability, particularly when moving upwards in the supply chain. Important managerial insights…

Una comunità che pone al centro le domande

2010

Gli inventari post mortem specchio delle ricchezze e delle miserie familiari. Il caso dei Luna (XV secolo)

2013

Il saggio indaga – attraverso l’analisi degli inventari redatti dai conti di Caltabellotta dagli inizi del XV secolo alla metà del XVI e degli atti di permute, vendite e donazioni di beni feudali – la situazione patrimoniale della famiglia Luna che aveva raccolto, assieme al titolo comitale, l’ingente eredità dei Peralta. La disamina della documentazione inedita presa in considerazione ha permesso di rivelare come, nonostante la ricchezza palesata negli oggetti inventariati, numerosi fossero i debiti della famiglia. Through the analysis of the inventories made by the Counts of Caltabellotta during the period from the beginning of the fifteenth to the middle of the sixteenth century and acts…

The Impact of Depression Symptoms in Patients with Parkinson’s Disease: A Novel Case-Control Investigation

2021

Parkinson’s disease is a common neurodegenerative disease and it is known to cause motor disturbances associated with musculoskeletal problems of the locomotor apparatus, and non-motor symptoms, that are believed to have a harmful effect on health, social functioning and mobility. The aim of this study was to evaluate depression in patients with Parkinson’s Disease (PD) compared to subjects who do not have it. The sample consisted of 124 participants (mean age 69.18 ± 9.12). Patients with PD were recruited from a center of excellence for Parkinson’s disease (cases n = 62) and healthy subjects without PD from their relatives and caregivers (control n = 62). The Spanish version of Beck’s Depr…

Sacred Music Production and Circulation in Sixteenth-Century Palermo: The Inventories of Giovanni Santoro (1550) and Luis Ruiz (1595)

2016

L'importanza degli inventari per lo studio della vita musicale a Palermo è stata riconosciuta soltanto di recente. Nonostante la natura frammentaria dei dati, questi documenti forniscono informazioni di rilievo sulle edizioni musicali, sugli strumenti, sulla cultura materiale che li produceva, nonché sulla circolazione della musica. Considerata la mancanza di testimoni musicali siciliani tra Cinque e Settecento, tale importanza appare ancor più evidente. Difatti, gli inventari palermitani testimoniano la presenza di libri di musica non più esistenti, in particolare musica a stampa, ma anche manoscritti e libri liturgici. L'articolo si sofferma su due inventari del Cinquecento. Il primo è l'…

A New Dynamic Model for Anticipatory Adaptive Control of Airline Seat Reservation via Order Statistics of Cumulative Customer Demand

2017

This paper deals with dynamic anticipatory adaptive control of airline seat reservation for the stochastic customer demand that occurs over time T before the flight is scheduled to depart. It is assumed that time T is divided into m periods, namely a full fare period and m−1 discounted fare periods. The fare structure is given. An airplane has a seat capacity of U. For the sake of simplicity, but without loss of generality, we consider (for illustration) the case of nonstop flight with two fare classes (business and economy). The proposed policies of the airline seat inventory control are based on the use of order statistics of cumulative customer demand, which have such properties as bivar…

Cooperative Inventory control

2005

In multi-retailer inventory control the possibility of sharing setup costs motivates communication and coordination among the retailers. We solve the problem of finding suboptimal distributed reordering policies that minimize setup, ordering, storage, and shortage costs incurred by the retailers over a finite horizon. Neuro-dynamic programming (NDP) reduces the computational complexity of the solution algorithm from exponential to polynomial on the number of retailers.

On the Bullwhip Avoidance Phase: supply chain collaboration and order smoothing

2009

This paper provides an assessment of the impact of collaboration and smoothing replenishment rules on supply chain operational performance and customer service level. Three supply chain configurations (i.e. Traditional, Information Exchange and Synchronised) in which orders are generated by smoothing (S, R) inventory control policies are studied for different proportional controllers. A supply chain stress test is performed through a sudden and intense change in demand. A structured and extended supply chain assessment framework is adopted. The main conclusions of this paper are the following. (i) The impact of Supply Chain Collaboration on overall supply chain performance is greater than t…

Adaptive Stochastic Airline Seat Inventory Control under Parametric Uncertainty

2013

Airline seat inventory control is a very profitable tool in the airline industry. The problem of adaptive stochastic airline seat inventory control lies at the heart of airline revenue management. This problem concerns the allocation of the finite seat inventory to the stochastic customer demand that occurs over time before the flight is scheduled to depart. The objective is to find the right combination of customers of various fare classes on the flight such that revenue is maximized. In this paper, the static and dynamic policies of stochastic airline seat inventory control (airline booking) are developed under parametric uncertainty of underlying models, which are not necessarily alterna…