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Documents authored by Nonato, Maddalena

Document
DOI: 10.4230/LIPIcs.ICLP.2012.415
Improving Quality and Efficiency in Home Health Care: an application of Constraint Logic Programming for the Ferrara NHS unit

Authors: Massimiliano Cattafi, Rosa Herrero, Marco Gavanelli, Maddalena Nonato, and Federico Malucelli

Published in: LIPIcs, Volume 17, Technical Communications of the 28th International Conference on Logic Programming (ICLP'12) (2012)

Abstract
Although sometimes it is necessary, no one likes to stay in a hospital, and patients who need to stay in bed but do not require constant medical surveillance prefer their own bed at home. At the same time, a patient in a hospital has a high cost for the community, that is not acceptable if the patient needs service only a few minutes a day. For these reasons, the current trend in Europe and North-America is to send nurses to visit patients in their home: this choice reduces costs for the community and gives better quality of life to patients. On the other hand, it introduces the combinatorial problem of assigning patients to the available nurses in order to maximize the quality of service, without having nurses travel for overly long distances. In this paper, we describe the problem as a practical application of Constraint Logic Programming. We first introduce the problem, as it is currently addressed by the nurses in the National Health Service (NHS) in Ferrara, a mid-sized city in the North of Italy. Currently, the nurses solve the problem by hand, and this introduces several inefficiencies in the schedules. We formalize the problem, obtained by interacting with the nurses in the NHS, into a Constraint Logic Programming model. In order to solve the problem efficiently, we implemented a new constraint that tackles with the routing part of the problem. We propose a declarative semantics for the new constraint, and an implementation based on an external solver.
Cite as

Massimiliano Cattafi, Rosa Herrero, Marco Gavanelli, Maddalena Nonato, and Federico Malucelli. Improving Quality and Efficiency in Home Health Care: an application of Constraint Logic Programming for the Ferrara NHS unit. In Technical Communications of the 28th International Conference on Logic Programming (ICLP'12). Leibniz International Proceedings in Informatics (LIPIcs), Volume 17, pp. 415-424, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2012)

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@InProceedings{cattafi_et_al:LIPIcs.ICLP.2012.415,
  author =	{Cattafi, Massimiliano and Herrero, Rosa and Gavanelli, Marco and Nonato, Maddalena and Malucelli, Federico},
  title =	{{Improving Quality and Efficiency in Home Health Care: an application of Constraint Logic Programming for the Ferrara NHS unit}},
  booktitle =	{Technical Communications of the 28th International Conference on Logic Programming (ICLP'12)},
  pages =	{415--424},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-43-9},
  ISSN =	{1868-8969},
  year =	{2012},
  volume =	{17},
  editor =	{Dovier, Agostino and Santos Costa, V{\'\i}tor},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICLP.2012.415},
  URN =		{urn:nbn:de:0030-drops-36419},
  doi =		{10.4230/LIPIcs.ICLP.2012.415},
  annote =	{Keywords: CLP(FD), Nurse Scheduling Applications, Home Health Care}
}
Document
DOI: 10.4230/OASIcs.SCOR.2012.103
A Bilevel Mixed Integer Linear Programming Model for Valves Location in Water Distribution Systems

Authors: Andrea Peano, Maddalena Nonato, Marco Gavanelli, Stefano Alvisi, and Marco Franchini

Published in: OASIcs, Volume 22, 3rd Student Conference on Operational Research (2012)

Abstract
The positioning of valves on the pipes of a Water Distribution System (WDS) is a core decision in the design of the isolation system of a WDS. When closed, valves permit to isolate a small portion of the network, so called a sector, which can be de-watered for maintenance purposes at the cost of a supply disruption. However, valves have a cost so their number is limited, and their position must be chosen carefully in order to minimize the worst-case supply disruption which may occur during pipe maintenance. Supply disruption is usually measured as the undelivered user demand. When a sector is isolated by closing its boundary valves, other portions of the network may become disconnected from the reservoirs as a secondary effect, and experience supply disruption as well. This induced isolation must be taken into account when computing the undelivered demand induced by a sector isolation. While sector topology can be described in terms of graph partitioning, accounting for induced undelivered demand requires network flow modeling. The aim of the problem is to locate a given number of valves at the extremes of the network pipes so that the maximum supply disruption is minimized. We present a Bilevel Mixed Integer Linear Programming (MILP) model for this problem and show how to reduce it to a single level MILP by exploiting duality. Computational results on a real case study are presented, showing the effectiveness of the approach.
Cite as

Andrea Peano, Maddalena Nonato, Marco Gavanelli, Stefano Alvisi, and Marco Franchini. A Bilevel Mixed Integer Linear Programming Model for Valves Location in Water Distribution Systems. In 3rd Student Conference on Operational Research. Open Access Series in Informatics (OASIcs), Volume 22, pp. 103-112, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2012)

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@InProceedings{peano_et_al:OASIcs.SCOR.2012.103,
  author =	{Peano, Andrea and Nonato, Maddalena and Gavanelli, Marco and Alvisi, Stefano and Franchini, Marco},
  title =	{{A Bilevel Mixed Integer Linear Programming Model for Valves Location in Water Distribution Systems}},
  booktitle =	{3rd Student Conference on Operational Research},
  pages =	{103--112},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-39-2},
  ISSN =	{2190-6807},
  year =	{2012},
  volume =	{22},
  editor =	{Ravizza, Stefan and Holborn, Penny},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.SCOR.2012.103},
  URN =		{urn:nbn:de:0030-drops-35519},
  doi =		{10.4230/OASIcs.SCOR.2012.103},
  annote =	{Keywords: Isolation Valves Positioning, Bilevel Programming, Hydroinformatics}
}
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