Andres Weintraub

Andres Weintraub
University of Chile · Departamento de Ingeniería Industrial

About

143
Publications
36,104
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
4,723
Citations
Citations since 2016
33 Research Items
2076 Citations
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300

Publications

Publications (143)
Presentation
Full-text available
A solution approach is proposed to optimize the selection of landscape cells for inclusion in firebreaks. It involves linking spatially explicit information on a landscape’s ecological values, historical ignition patterns and fire spread behavior. An MIP firebreak siting optimization model is formulated that captures the tradeoff between the direct...
Presentation
Full-text available
El fuerte vínculo entre el cambio climático y el aumento del riesgo de incendios forestales sugiere un cambio de paradigma sobre cómo los seres humanos debemos coexistir con el fuego y el medio ambiente. Estos eventos pueden afectar tanto a zonas forestales (parques nacionales, plantaciones productivas, etc.) como también zonas de interfaz, con gra...
Preprint
Full-text available
Methods that estimate the niche of a species by calculating a convex hull or an elliptical envelope have become popular due to their simplicity and interpretation, given Hutchinson’s conception of the niche as an n -dimensional hypervolume. It is well known that convex hulls are sensitive to outliers and do not have the ability to differentiate bet...
Preprint
Full-text available
Aim Applying wide and effective sampling of animal communities is rarely possible due to the associated costs and the use of techniques that are not always efficient. Thus, many areas have a faunistic hidden diversity we denote Animal Dark Diversity (ADD), defined as the diversity that is present but not yet detected plus the diversity defined by P...
Article
Full-text available
Cell2Fire is a new cell-based wildland fire growth simulator designed to integrate data-driven decision-making models. The fire environment is modeled by partitioning the landscape into cells characterized by fuel, weather, moisture, and topographic attributes. It can use existing fire spread models such as the Canadian Forest Fire Behavior Predict...
Preprint
Full-text available
Traditional Species Distribution Models (SDMs) may not be appropriate when examples of one class (e.g. absence or pseudo-absences) greatly outnumber examples of the other class (e.g. presences or observations), because they tend to favor the learning of observations more frequently. We present an ensemble method called R andom U nder S ampling and...
Article
We present a study of annual forestry harvesting planning considering the risk of compaction generated by the transit of heavy forestry machinery. Soil compaction is a problem that occurs when the soil loses its natural resistance to resist the movement of machinery, causing the soil to be compacted in excess. This compaction generates unwanted eff...
Article
The strong link between climate change and increased wildfire risk suggests a paradigm change on how humans must co-exist with fire and the environment. Different studies have demonstrated that human-induced fire ignitions can account for more than 90 % of forest fires, so human coexistence with wildfires requires informed decision making via preve...
Presentation
Full-text available
With climate change, the already serious problem of forest fires is clearly becoming increasingly troublesome. This is happening in vast forest areas as well as in urban-rural interphase, with grave consequences to population living in or near forests. Analytic tools have been developed to support particular decisions on fire suppression: what reso...
Article
Full-text available
Long time horizons, typical of forest management, make planning more difficult due to added exposure to climate uncertainty. Current methods for stochastic programming limit the incorporation of climate uncertainty in forest management planning. To account for climate uncertainty in forest harvest scheduling, we discretize the potential distributio...
Article
Full-text available
The wildland-urban interface (WUI) is the spatial manifestation of human communities coupled with vegetated ecosystems. Spatial delineation of the WUI is important for wildfire policy and management, but is typically defined according to spatial relationships between housing development and wildland vegetation without explicit consideration of fire...
Article
Because of its importance in logistics costs, transportation is usually seen as the primal activity for which horizontal collaboration should be pursued. Yet, just a few cases are reported and these have been operated during limited time. We offer here an explanation, by departing from the operational research models used to date, where collaborati...
Preprint
Full-text available
Climate change and its impact on a multitude of factors are some of the most important challenges natural resource managers face today. Long time horizons, typical of forest management, make planning more difficult due to added exposure to climate uncertainty. Current methods for stochastic programming limit the integration of climate uncertainty i...
Article
In the technician dispatching problem, a given number of repair teams must visit different locations to provide service support. Considering that there is a fixed vehicle capacity and variations in the demand, not all requests can be satisfied on time and therefore some of them must be delayed. Most implementations of the dispatching problem consid...
Article
Full-text available
Due to the long time horizon typically characterizing forest planning, uncertainty plays an important role when developing forest management plans. Especially important is the uncertainty related to recently human-induced global warming since it has a clear impact on forest capacity to contribute to biogenic and anthropogenic ecosystem services. If...
Article
Planning for management actions that address threats to biodiversity is important for securing its long term persistence. However, systematic conservation planning (SCP) has traditionally overlooked this aspect and just focused on identifying priority areas without any recommendation on actions needed. This paper develops a mixed integer mathematic...
Article
A new scheme for dealing with the uncertainty in the scenario trees is considered in the presence of strategic and tactical stochastic parameters for a dynamic mixed 0–1 optimization model in a forest harvesting network along a time horizon under uncertainty. The strategic level of the model presented in this work is included by a several years tim...
Article
The design of conservation management plans is a crucial task for ensuring the preservation of ecosystems. A conservation plan is typically embodied by two types of decisions: in which areas of a given territory it will be implemented, and how actions against threats will be deployed across these areas. These decisions are usually guided by the res...
Preprint
Full-text available
In practical applications, it is common that wildfire simulators do not correctly predict the evolution of the fire scar. Usually, this is caused due to multiple factors including inaccuracy in the input data such as land cover classification, moisture, improperly represented local winds, cumulative errors in the fire growth simulation model, high...
Preprint
Cell2Fire is a new cell-based forest and wildland landscape fire growth simulator that is open-source and exploits parallelism to support the modelling of fire growth cross large spatial and temporal scales in a timely manner. The fire environment is characterized by partitioning the landscape into a large number of cells each of which has specifie...
Presentation
Full-text available
Traditionally, forest planners have used expected growth and yield coefficients to predict future merchantable timber volumes in harvest scheduling models. However, uncertainties in long-term temperature and precipitation coupled with increase of fire, wind-storms or landslides due to climate change may affect stand development. The traditional app...
Article
This paper describes the creation, development, implementation and impact of a system optimizing the distribution of petroleum products by pipeline at Empresa Nacional del Petroleo, the state-owned oil company in Chile. Refined oil products are sent via a pipeline from a refinery in the South to terminals located between the refinery and the center...
Article
During recent years, horizontal collaboration in logistics has gained attention because of achieved potential benefits such as cost reduction, an increase in fulfillment rates, and a decrease in CO2 emissions owing to reductions in traveled distances. Successful real‐world cases, however, are rare since horizontal cooperation in logistics is not us...
Article
A core process in forestry planning corresponds to the design of optimal harvesting policies along with road network layouts. In the most common setting, decision makers seek for solutions that maximize the profit of the forest while respecting operative and market constraints. Due to the long-term nature of the industry, the inherent uncertainty i...
Article
The paper presents and compares approaches for controlling forest companies' risk associated with advance planning under variable future timber prices and demand. Decisions to be made in advance are which stands to cut and which new access roads to build in each period, while maximizing profit under manageable risk. We first developed a tighter, im...
Article
We propose a multicriteria decision-making framework to support strategic decisions in forest management, taking into account uncertainty due to climate change and sustainability goals. In our setting, uncertainty is modeled by means of climate change scenarios. The decision task is to define a harvest scheduling that addresses, simultaneously, con...
Article
For the past 12 years, the Chilean Professional Soccer Association (ANFP) has applied operations research (OR) techniques to schedule soccer leagues in Chile. Using integer programming-based methods, the ANFP decides which matches are played in each round, taking into account various objectives, such as holding down costs and ensuring engaging tour...
Article
We develop a stand-level fire threat index and incorporate it in a mixed integer programming model that can be used to help specify strategies that will maximize the expected volume harvested from a flammable forest over a finite planning horizon, subject to adjacency constraints. The inclusion of a threat index in our objective function implicitly...
Article
An approach is proposed for incorporating the variations in timber growth and yield due to climate change uncertainty into the forest harvesting decision process. A range of possible climate scenarios are transformed by a forest growth and yield model into tree growth scenarios, which in turn are integrated into a multistage stochastic model that d...
Article
Full-text available
We analyse how to deal with the uncertainty before solving a stochastic optimization problem and we apply it to a forestry management problem. In particular, we start from historical data to build a stochastic process for wood prices and for bounds on its demand. Then, we generate scenario trees considering different numbers of scenarios and differ...
Article
Full-text available
Forestry has contributed many problems to the Operations Research (OR) community. At the same time, OR has developed many models and solution methods for use in forestry. In this article, we describe the current status of research on the application of OR methods to forestry and a number of research challenges or open questions that we believe will...
Article
Full-text available
An introduction to the special volume on Operations Research in Forestry from the 14th Symposium for Systems Analysis in Forest Resources, held at the Marbella Resort, Maitencillo, Chile, March 8-11, 2011. This volume of the Annals of Operations Research contains some of the papers presented at the Symposium that were submitted for publication and...
Article
We consider a real problem faced by a large company providing repair services of office machines in Santiago, Chile. In a typical day about twenty technicians visit seventy customers in a predefined service area in Santiago. We design optimal routes for technicians by considering travel times, soft time windows for technician arrival times at clien...
Chapter
Transportation accounts for a significant part of wood procurement cost, and this has generated a considerable amount of R&D efforts in many countries. In this chapter, we first introduce the vital role played by transportation in the forest value chain, and stress the information needed for decision making. Following this, we distinguish the diffe...
Article
We consider the important problem of medium term forest planning with an integrated approach considering both harvesting and road construction decisions in the presence of uncertainty modeled as a multi-stage problem. We give strengthening methods that enable the solution of problems with many more scenarios than previously reported in the literatu...
Article
This paper proposes a multi-criteria approach that accounts for the risk of fire when determining the optimal rotation of a forest stand that is being managed for both timber production and carbon sequestration purposes. The multi-criteria framework uses in a combined way, multi-objective optimization and compromise programming methods. The propose...
Article
This special issue in mining presents surveys and applications. Specifically, in the former category, the issue contains a tutorial on open-pit mine-scheduling models, a literature review on equipment selection, and a combination of a tutorial and literature review on ventilation systems in underground mining. In the latter category, the issue cont...
Article
Deterministic mine planning models along a time horizon have proved to be very effective in supporting decisions on sequencing the extraction of material in copper mines. Some of these models have been developed for, and used successfully by CODELCO, the Chilean state copper company. In this paper, we wish to consider the uncertainty in a very vola...
Article
Ship routing problems are a particular kind of routing problems where the vehicles to be routed are vessels or ships, usually in maritime environments. In contrast to land routing, ship routing has unique features, including overnight trips, disjoint time windows, not necessarily prespecified routes, and a great uncertainty derived from weather con...
Article
Full-text available
We consider the problem of dispatching technicians to service/repair geographically distributed equipment. This problem can be cast as a vehicle routing problem with time windows, where customers expect fast response and small delays. Estimates of the service time, however, can be subject to a significant amount of uncertainty due to misdiagnosis o...
Article
Full-text available
The salmon farming production chain is structured in four consecutive phases: freshwater, seawater, plant processing, and distribution and marketing. The phases interact in a pull manner, freshwater stocks fish to meet seawater's demand, seawater produces to meet plant processing biomass demand, and the processing plant produces to satisfy consumer...
Article
Full-text available
Connectivity requirements are a common component of forest planning models, with important examples arising in wildlife habitat protection. In harvest scheduling models, one way of addressing preservation concerns consists of requiring that large contiguous patches of mature forest are maintained. In the context of nature reserve design, it is comm...
Article
Salmon farming in Chile constitutes one of the nation's principal food exporting sectors. In the seawater stage, one of the most important in the farm production chain, salmon are cultivated in floating cages fitted with nets that hold the fish during the entire grow-out process. The maintenance of the cage nets is carried out at land-based facilit...
Article
Full-text available
Co-Editors of the Special Issue: Jérémie Gallien, London Business School, Regent's Park, London NW1 4SA, United Kingdom; and Alan Scheller-Wolf, Tepper School of Business, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213. Associate Editors of the Special Issue: Srinivas Bollapragada, Felipe Caro, Charles Corbett, Marshall Fisher, Ananth I...
Article
A multi-period stochastic model and an algorithmic approach to location of prison facilities under uncertainty are presented and applied to the Chilean prison system. The problem consists of finding locations and sizes of a preset number of new jails and determining where and when to increase the capacity of both new and existing facilities over a...
Article
The Chilean Ministry of Education oversees preschool, primary, and secondary education in both urban and rural areas. Many parts of Chile are sparsely populated and there are currently over 4,000 rural schools (almost 38% of all schools in Chile) educating 9.5% of the students in the country. Many of the rural schools are small with only one teache...
Article
Full-text available
In this paper, we present a system that Compañía Sud Americana de Vapores (CSAV), one of the world's largest shipping companies, developed to support its decisions for repositioning and stocking empty containers. CSAV's main business is shipping cargo in containers to clients worldwide. It uses a fleet of about 700,000 TEU containers of different t...
Article
Operations research is becoming increasingly prevalent in the natural resource sector, specifically in agriculture, fisheries, forestry and mining. While there are similar research questions in these areas, e.g., how to harvest and/or extract the resources and how to account for environmental impacts, there are also differences, e.g., the length of...
Article
This work addresses a tactical planning problem faced by a forestry firm, deciding which timber units to harvest and what roads to build to obtain the greatest possible benefits. We include uncertainty in prices by means of utility theory. This enables solutions to be found that the firm finds preferable to those obtained when risk aversion is igno...
Article
The forest harvest and road construction planning problem consists fundamentally of managing land designated for timber production and divided into harvest cells. For each time period the planner must decide which cells to cut and what access roads to build in order to maximize expected net profit. We have previously developed deterministic mixed i...
Article
A partial static competitive equilibrium theory is presented and the corresponding constrained logit model specified for a given scenario of policies, which yields the expected equilibrium locations, prices of schools, and students’ school choices. Rational students differentiated by socioeconomic cluster demand vacancies at different schools after...
Article
Full-text available
We address the problem of developing policies for selecting the proper number of technicians to hire (fleet size) for an on-call repair service operating over a yearly planning horizon in an environment where the number of requests to be serviced each day can vary significantly from day to day and on a seasonal basis. We propose a new approach base...
Article
Freight railway crew scheduling consists of generating crew duties for operating trains on a schedule at minimal cost while meeting all work regulations and operational requirements. Typically, a freight railway operation uses thousands of trains and ...
Chapter
Over the years, operational research (OR) has been used extensively to support the forest products industry and public forestry organizations in their respective planning activities concerning the flow of wood fiber from the forest to the customer. The planning decisions range from long-term strategic planning decisions related to forest management...
Article
Modeling both road construction and land management activities as 0–1 variables greatly enhances the spatial aspect of linear programming models dealing with harvest scheduling and transportation planning. In previous work we developed a heuristic procedure that modeled only road construction as 0–1 variables. We have expanded this past procedure t...
Article
Operations research is becoming increasingly prevalent in the natural resource sector, specifically in agriculture, fisheries, forestry and mining. While there are similar research questions in these areas, e.g., how to harvest and/or extract the resources and how to account for environmental impacts, there are also differences, e.g., the length of...
Technical Report
When a company is integrated vertically, it can manage and plan its overall value chain in one direct and integrated approach. However in many cases, companies follow a decoupled approach where forests and production plants optimize separately their processes in a supply-driven strategy. In Chile, the two largest forest companies are vertically int...
Article
Full-text available
Forest management planners usually treat potential fire loss estimates as exogenous parameters in their timber production planning processes. When they do so, they do not account for the fact that forest access road construction, timber harvesting, and silvicultural activities can alter a landscape’s vegetation or fuel composition, and they ignore...
Article
This study focuses on a medium-term forest harvesting problem considering the protection of environmental components such as soil, water resources, and landscape. A mathematical model that elaborates different environmental protection alternatives for each environmental component and the net present value of the forest company was developed. This i...
Article
Applications of operations research to mine planning date back to the 1960s. Since that time, optimization and simulation, in particular, have been applied to both surface and underground mine planning problems, including mine design, long-and short-term production scheduling, equipment selection, and dispatching, inter alia.In this paper, we revie...
Article
Full-text available
We present a methodology for long‐term mine planning based on a general capacitated multi-commodity network flow problem formulated as a comprehensive math programming model. The planning methodology considers underground and open pit ore deposits sharing multiple downstream processing plants over a long horizon. The purpose of the model is to opti...
Article
This study addresses the problem of scheduling the daily assignment of available trucks for delivery of forest products required at different destinations. The products are logs of various types depending on their point of origin, and are defined in terms of length and diameter. Their destinations include sawmills, pulp mills, and other plants, and...
Article
Full-text available
This work presents a multi-stage stochastic model and an algorithmic approach to select prison facility sites under uncertainty in Chile. The problem consists of siting a given number of new facilities and determining the size and optimal resource assignment for new and existing facilities while minimizing the expected siting costs of the prison sy...
Article
This paper presents a deterministic linear optimization model to support decisions on optimal allocation of schools to zones, its characterization and assignment of students, maximizing the social benefits of school owners and students. Students are assumed to show a multi-attribute behaviour, considering as important not only location, as is usual...