Showing papers by "HEC Montréal published in 2022"
TL;DR: In this paper, the authors extended the existing optimisation framework for optimal design of SSMR-MS in which machine learning techniques are employed to describe the relationship between solar-related cost and molten salt heat duty and establish relationships of TAC, hydrogen production rate and other input variables in the whole flowsheet based on the Latin hypercube sampling technique.
10 citations
TL;DR: In this paper , the authors show that battery deployment in the years 2013 through 2017 lowered average intra-day wholesale price spreads and that current market conditions limit the profitability of batteries in this market.
9 citations
TL;DR: Li et al. as discussed by the authors proposed an efficient hierarchical solution evaluation method for a general VRPD problem with multiple visits (VRPD-MV), in which each vehicle is equipped with a single drone capable of serving multiple customers per trip.
Abstract: Vehicle routing problem with drones (VRPD) has recently gained much traction among the research community due to its potential to improve efficiency and reduce costs for delivery. However, limited research investigates feasibility evaluation methods for the VRPD due to complex synchronization requirements between truck routes and drone trips. This paper proposes an efficient hierarchical solution evaluation method for a general VRPD problem with multiple visits (VRPD-MV), in which each vehicle is equipped with a single drone capable of serving multiple customers per trip. The endurance model is based on both the payload and flight time of the drone. The solution evaluation method decomposes a combined truck–drone route into its constituent truck segment and drone segment, which are collectively recognized as a route segment. Thereafter, efficient processing methods are developed for each segment type. We hybridize an iterative local search heuristic with a variable neighborhood descent procedure (ILS-VND) to solve the VRPD-MV. The algorithm obtains promising computational results in reasonable times for the VRPD-MV. Specifically, the proposed evaluation method is shown to accelerate the feasibility evaluation of a solution and reduce the time complexity to O(1) independent of the length of the route. The computational results also show a positive impact of powerful drones on reducing solution costs. Lastly, the ILS-VND outperforms a state-of-the-art algorithm on the multi-visit traveling salesman problem with multi-drones in terms of both solution qualities and computational times required.
8 citations
TL;DR: In this article , the mean field game (MFG) limit with sub-population of heterogeneous agents was used to characterize firms' optimal controls as the solution of McKean-Vlasov (MV) forward-backward stochastic differential equations (FBSDEs) and determine the equilibrium SREC price.
Abstract: Solar renewable energy certificate (SREC) markets are a market-based system that incentivizes solar energy generation. A regulatory body overseeing load serving entities imposes a lower bound on the amount of energy each regulated firm must generate via solar means, providing them with a tradeable certificate for each MWh generated. Firms seek to navigate the market optimally by modulating their SREC generation and trading rates. As such, the SREC market can be viewed as a stochastic game, where agents interact through the SREC price. We study this stochastic game by solving the mean-field game (MFG) limit with subpopulations of heterogeneous agents. Market participants optimize costs accounting for trading frictions, cost of generation, nonlinear noncompliance costs, and generation uncertainty. Moreover, we endogenize SREC price through market clearing. We characterize firms' optimal controls as the solution of McKean–Vlasov (MV) forward-backward stochastic differential equations (FBSDEs) and determine the equilibrium SREC price. We establish the existence and uniqueness of a solution to this MV-FBSDE, and prove that the MFG strategies form an ε $\epsilon$ -Nash equilibrium for the finite player game. Finally, we develop a numerical scheme for solving the MV-FBSDEs and conduct a simulation study.
8 citations
TL;DR: In this article , the authors consider a supply chain where demand depends on the manufacturer's environmental reputation, an asset that can only be built over time and assume that this reputation depends on information emanating from the manufacturer itself about its environmental actions and on its objective environmental record when compared to an industry standard.
7 citations
TL;DR: In this article , the authors show that many so-called "bad deals" are often in the interest of acquirer-firm shareholders when accounting for wealth effects on their rival stakes.
7 citations
TL;DR: A systematic overview of research on social innovation and biodiversity is missing and as mentioned in this paper contributes by focusing on the social innovation to tackle the drivers of biodiversity loss and unsustainability, and proposes three cross cutting issues that can be a focus for future research, practice and supportive policy.
Abstract: There are calls for social innovation to help with the effort to halt biodiversity loss. However, research on social innovation and biodiversity is dispersed and covers a multitude of disciplines. A systematic overview of research on social innovation and biodiversity is missing and this paper contributes by focusing on social innovation to tackle the drivers of biodiversity loss and unsustainability. The paper reviews research on social innovation in changing land use (agriculture, forestry, aquatic ecosystems and cities), in tackling exploitation of organisms (fishing, hunting, harvesting), and in addressing threats of climate change, pollution and invasive species. Across these drivers, we find a) a strong emphasis on social innovation as civic action for changing practices in addressing unsustainability, b) that social innovation research tends to focus on local experimentation although there are bodies of literature on policy-driven innovations and consumer/producer-driven innovations, and c) that there is very little research taking a critical perspective to explore negative or unintended consequences of social innovation. Drawing on the review, we propose three cross cutting issues that can be a focus for future research, practice and supportive policy: social innovation for nature-based solutions, social innovation for participatory governance, and social innovation for technology that tackles biodiversity loss.
6 citations
TL;DR: In this paper , the authors present the update of the recommendations of the French Society of Radiation Oncology on the radiotherapy of head and neck tumours from the imaging work-up needed for optimal selection of treatment volume, to optimization of the dose distribution and delivery.
Abstract: Radiotherapy alone or in association with systemic treatment plays a major role in the treatment of head and neck tumours, either as a primary treatment or as a postoperative modality. The management of these tumours is multidisciplinary, requiring particular care at every treatment step. We present the update of the recommendations of the French Society of Radiation Oncology on the radiotherapy of head and neck tumours from the imaging work-up needed for optimal selection of treatment volume, to optimization of the dose distribution and delivery.
6 citations
TL;DR: In this paper , a general class of entropy-regularized multi-variate LQG mean field game (MFG) systems with K distinct sub-populations of agents is studied.
5 citations
TL;DR: Using a model for areal data provides good results in terms of predictive accuracy and allows flexibility in accounting for the main features of the dataset, and shows the computational efficiency of the approach despite the huge dataset.
Abstract: Careful planning of an ambulance service is critical to reduce response times to emergency calls and make assistance more effective. However, the demand for emergency services is highly variable, and good prediction of the number of future emergency calls, and their spatial and temporal distribution, is challenging. In this work, we propose a Bayesian approach to predict the number of emergency calls in future time periods for each zone of the served territory. The number of calls is described by a generalized linear mixed effects model, and inference, in terms of posterior predictive distributions, is obtained through Markov chain Monte Carlo simulation. Our approach is applied in a large city in Canada. The paper demonstrates that using a model for areal data provides good results in terms of predictive accuracy and allows flexibility in accounting for the main features of the dataset. Moreover, it shows the computational efficiency of the approach despite the huge dataset
5 citations
TL;DR: In this article, a branch-and-check approach is proposed to solve the tourist trip design problem with time-related constraints, such as budget, opening-time windows at the locations, and maximum trip duration.
TL;DR: In this article , the authors examined the voluntary disclosure of earnings forecasts by female CEOs and found that female CEOs tend to issue more earnings forecasts than male CEOs, and those forecasts are more accurate.
Abstract: Abstract This study examines the voluntary disclosure of earnings forecasts by female CEOs. We find that in the backdrop of increased pressure to perform from investors and other stakeholders, female CEOs tend to issue more earnings forecasts than male CEOs, and those forecasts are more accurate. We also find that while financial analysts generally prefer to follow companies headed by male CEOs, female CEOs’ efforts to issue accurate earnings forecasts pay off, as these efforts help them close the analyst coverage gap. We provide complementary evidence on the disclosure efforts of female CEOs with regard to updates to the forecast and the 10-K report. Lastly, we show that financial analysts rely more on the earnings forecasts of female CEOs, possibly because they recognize female CEOs’ superior forecasting quality. Our results are robust to the use of alternative research designs, including difference-in-difference, propensity score matching, and entropy balancing. Overall, our study documents gender differences in voluntary disclosure by senior management.
TL;DR: This article found that industry leaders brownwash their environmental performance to avoid peer pressure and excessive stakeholder attention, and to preserve their firm's leadership, and this phenomenon can be curbed by adopting sound environmental governance mechanisms aimed at improving corporate transparency and environmental practices.
Abstract: Numerous studies have investigated the factors that drive or curb greenwashing activities, but few have discussed the other side of the coin, brownwashing, the underreporting of environmental achievements, another form of corporate decoupling that is harmful for stakeholders. Using a sample of 5459 firm–year observations over the period 2007–2017, this study tests and finds that industry leaders brownwash their environmental performance to avoid peer pressure and excessive stakeholder attention, and to preserve their firm's leadership. Consequently, legitimate firms tend to converge toward informal industry standards that engender standardized environmental disclosures. Nevertheless, this phenomenon can be curbed by adopting sound environmental governance mechanisms aimed at improving corporate transparency and environmental practices.
TL;DR: In this article , the relationship between salesperson lone wolf tendency and ethical behaviors is examined as well as two social cognitive aspects (i.e., perceived supervisor support and salesperson self-efficacy) that potentially act as important boundary conditions that distinctively alter the salesperson lone wolf tendency-ethical behaviors negative relationship.
TL;DR: In this article, change point tests for independent random vectors can also be used with pseudo-observations for testing change-point in the joint distribution of nonobservable random vectors, the associated copula, or the margins.
TL;DR: In this article, the authors considered a retailer with an online store and a network of stores operating in an omni-channel strategy, where the fulfillment decision for an online order, which contains a number of items, involves the allocation of these items to the stores where they are available and the selection of one store for consolidation of the items into the final package to be dispatched to the customer.
TL;DR: In this article, the authors propose an iterated greedy matheuristic for efficiently solving stochastic railway rapid transit transportation network construction scheduling problems, where both the construction duration of the segments and the passenger demand rate of increase are stochastically.
TL;DR: In this article , a two-phase matheuristic is used to solve the constrained location-allocation problem and a cluster-first, tree-second heuristic is applied to the second subproblems.
TL;DR: This paper explored how older professionals in the financial services sector may see how three psychological needs (i.e., autonomy, competence, and relatedness) are satisfied or frustrated through various management practices such as monetary rewards, benefits, career development, and work content and context.
Abstract: The twin issues of population aging and critical talent shortages induce employers to encourage older workers to prolong their professional lives. Over the past two decades, studies have mainly examined which human resources practices influence older workers’ ability, motivation, and opportunity to continue working. Our conceptual lens rest on self-determination theory (SDT). This study explores how older professionals in the financial services sector may see how three psychological needs (i.e., autonomy, competence, and relatedness) are satisfied or frustrated through various management practices such as monetary rewards, benefits, career development, and work content and context. Our interviews with older finance professionals also show the relevance of a fourth need, beneficence, to understand their decision to continue to work. Results of this study are likely to be significant at both managerial and societal levels in the perspective of sustainable development or employability.
TL;DR: In this article , the authors identify four strategies by which entrepreneurs leverage a preexisting fit between what entrepreneurs and audiences value, and foster greater fit by presenting endeavors in familiar terms, and guiding audiences' interpretations.
Abstract: Research Summary We theorize the strategies that entrepreneurial actors employ to instill their endeavors with culturally resonant meanings and rally the support of key audiences (investors, analysts, or customers). In extant cultural entrepreneurship research, endeavors are assumed to achieve resonance and gain support when actors deploy the culture they share with their targeted audiences. But what if actors and audiences hold cultural repertoires that poorly overlap? We consider actors' efforts to “mobilize” and “enrich” the repertoires of both parties. Specifically, we introduce a typology identifying four strategies: anchoring, retooling, channeling, and seeding. Viewing culture as an engine of stability and change, we contend that each strategy addresses a distinct tension that actors must skillfully balance. We develop propositions to explain how and when actors manage these tensions. Managerial Summary Entrepreneurs must explain their endeavors in terms that audiences (investors, analysts, or customers) will understand and value. We know that entrepreneurs do so by telling stories and performing other symbolic actions, or by revising their stories and actions. However, prior insights assume a preexisting fit between what entrepreneurs and audiences value. How is this fit created? We identify four strategies by which entrepreneurs leverage a preexisting fit, and foster greater fit. We explain how entrepreneurs leverage a preexisting fit by presenting endeavors in familiar terms, and guiding audiences' interpretations. We explain how entrepreneurs foster greater fit by learning what audiences value, and educating audiences about their endeavors' value. Considering the inherent tension that each strategy entails, we explain how and when entrepreneurs use these strategies.
TL;DR: In this article, the optimal pricing and order quantity of two substitute products in two markets, one of them is seasonal, with a decreasing market potential over time, and the other is non-seasonal.
TL;DR: In this article, a tractable integer linear program for the locomotive routing problem is proposed, which is based on a time-space network representation of the problem that allows us to track the maintenance status of specific locomotives over the planning horizon and to manage locomotive assignments to trains based on their current maintenance status.
01 Jan 2022
TL;DR: The potential for policy-driven emissions reductions to "leak" to less regulated regions is a well-researched topic in climate change economics, though no clear conclusion regarding the likely magnitude of the problem has yet to emerge from the literature as mentioned in this paper .
Abstract: The potential for policy-driven emissions reductions to "leak" to less regulated regions is a well-researched topic in climate change economics, though no clear conclusion regarding the likely magnitude of the problem has yet to emerge from the literature. This chapter offers a broad overview of carbon leakage estimates, combining insights from various methodologies that existing meta-studies have so far reviewed separately: "simulation" studies providing ex-ante projections from complex economic models, and "estimation" studies that econometrically tease out ex-post evidence for leakage from existing carbon pricing schemes. Combined with additional indirect evidence that trade frictions are generally strong relative to climate policy-induced energy price differentials, I conclude that the weight of evidence points to the conclusion of "some, but not too much" leakage: while specific sectors may be severely affected, estimated economy-wide leakage rates (of 10-30% on average) do not justify using it as an argument against climate policy.
01 Jan 2022
01 Feb 2022
TL;DR: In this article , various treatment options, by primary or postoperative external radiotherapy and by brachytherapy for the p16-negative oropharyngeal squamous cell carcinoma, are presented.
Abstract: This article reviews the various treatment options, by primary or postoperative external radiotherapy and by brachytherapy for the p16-negative oropharyngeal squamous cell carcinoma. Dose levels, fractionation and association with systemic treatments are presented. The need for neck node dissection post local treatment is discussed, as well as specificities for the management of p16-positive tumours. Guidelines for target volume selection and delineation are thoroughly elaborated. Last, the management by radiotherapy of locoregional recurrences is discussed.
TL;DR: In this paper, the authors analyze whether (correct) information provision on immigration is more effective than contact in shaping attitudes towards immigration and find that on average, students develop better attitudes toward immigration (especially in the case of policy preferences and perceived number of immigrants in their country) and somewhat improve their feelings associated with immigrants after the information treatment more than they do after the contact treatment.
TL;DR: In this paper , a hybrid LQG-HOC game with switching and stopping times was considered and the Nash equilibrium was established for the case where there was one major agent with a significant influence on the system together with a large number of minor agents constituting two subpopulations.
01 Jan 2022
TL;DR: In this article, the authors proposed a topological method to screen critical transmission lines and buses under multi-contingency of transmission lines, which is based on current flow betweenness centrality, and provides a structural analysis of the system.
TL;DR: In this paper , the authors evaluated the long-term efficacy of intravitreal antivascular endothelial growth factor injections (IVI) alone or in combination with verteporfin photodynamic therapy (VPT) for management of choroidal neovascularization secondary to presumed ocular histoplasmosis syndrome (POHS).
Abstract: To assess the long-term efficacy of intravitreal antivascular endothelial growth factor injections (IVI), alone or in combination with verteporfin photodynamic therapy (IVI/PDT), for management of choroidal neovascularization secondary to presumed ocular histoplasmosis syndrome (POHS).Retrospective, comparative, interventional case series analyzing 82 eyes in 74 patients treated with either IVI or IVI/PDT for presumed ocular histoplasmosis syndrome choroidal neovascularization from January 2006 to January 2021.The average logarithm of the minimum angle of resolution VA in year 5 was 0.40 (20/50) and 0.52 (20/67) for IVI versus IVI/PDT groups, respectively ( P = 0.33), and in year 10 was 0.53 (20/58) and 0.64 (20/86), respectively ( P = 0.50). The average number of annual injections over the first 5 years of follow-up was 3.3 versus 1.7 for IVI versus IVI/PDT groups, respectively ( P < 0.001), and over 10 years was 3.3 versus 1.6, respectively ( P < 0.001). Treatment-free interval of 5 years was reached by 39% versus 60% in IVI versus IVI/PDT groups, respectively ( P = 0.95).Our study found both IVI and IVI/PDT to be effective in long-term management of presumed ocular histoplasmosis syndrome choroidal neovascularization, with a fewer number of annual injections and longer treatment-free interval in the combination group. However, given the limitations of a retrospective study, a prospective randomized study is necessary to determine whether the addition of PDT significantly decreases treatment burden.