Publications with Fulltext
Permanent URI for this collectionhttps://hdl.handle.net/20.500.14288/6
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Publication Open Access Majority choice of an income-targeted educational voucher(American Economic Association (AEA), 2018) Epple, Dennis; Romano, Richard; Department of Economics; Sarpça, Sinan; Faculty Member; Department of Economics; College of Administrative Sciences and Economics; 52406A model of majority choice of voucher characteristics with quantitative counterpart explains observed income eligibility requirements for educational vouchers. Households differ by income and preference for religious schooling. They elect a policy maker who chooses public school expenditure, a voucher, a maximum income for voucher eligibility, and a tax to finance public expenditure. Equilibrium has a voucher below per student public expenditure, an eligibility threshold near 300 percent of the poverty level, and a majority in public school though with substantial voucher usage, all properties typical of US voucher programs. Disallowing a voucher leads to higher per student public expenditure.Publication Open Access Choice, consideration sets, and attribute filters(American Economic Association (AEA), 2018) Department of Economics; Kimya, Mert; Faculty Member; Department of Economics; College of Administrative Sciences and EconomicsIt is well known that decision makers do not always consider all of the available alternatives when making a choice. When the alternatives have attributes, these attributes provide a natural way to form the consideration set. I assume a procedure in which the decision maker uses the relative ranking of the alternatives on each attribute to reduce the size of the choice set. I provide a characterization of the procedure and illustrate how to identify the underlying preference and consideration set. The model explains certain choice anomalies such as the attraction and the compromise effects.Publication Open Access Positioning multicountry brands: the impact of variation in cultural values and competitive set(American Marketing Association (AMA), 2017) Batra, Rajeev; Zhang, Y. Charles; Feinberg, Fred M.; Department of Business Administration; Aydınoğlu, Nilüfer Zümrüt; Faculty Member; Department of Business Administration; College of Administrative Sciences and Economics; 114037Building on cultural values research, the authors identify specific image attributes on which multicountry brands should position themselves consistently across markets. Leveraging prior research, they identify three life values that are most equal (benevolence, universalism, and self-direction) and two that are least equal (power and hedonism) in cross-national importance. The authors link specific brand image attributes (e.g., friendly, social, elite style, arrogant) to these life values through empirical data and semantic analysis. Using an extensive field data set on consumer perceptions and preferences from 22 countries regarding more than 1,700 brands, the authors then show that greater global consistency of a brand's image decreases overall brand attitudes if the specific image attribute is one that is not equally desired worldwide. They also find that the attitudinal impact of a multicountry brand's positioning consistency on commonly valued image attributes is greater when the set of competitors the brand faces across its markets is more homogeneous. The authors discuss implications for global brand management theory and practice.Publication Open Access Measuring construction for social, economic and environmental assessment(Emerald, 2019) İlhan, Bahriye; Department of Computer Engineering; Yobas, Mümine Banu; Teaching Faculty; Department of Computer Engineering; College of EngineeringPurpose: the purpose of this paper is to examine the issues that should be considered for a better gauge of the construction industry and built environment and to propose a set of indicators for measuring the social, economic and environmental value of construction. Design/methodology/approach: the indicators proposed in this study use Pearce's schema, which presents a framework to evaluate the socio-economic value of construction and its contribution to sustainable development. After analysing the problems faced by the industry, solutions are raised and finally indicators for each pillar of Pearce's schema are established through a literature review. Since the proposed indicators can be used for cross-country analysis, these comparisons are also presented as graphs including only those countries for which valid national data could be sourced from OECD databases. Findings: the issues, suggestions and indicators related to each concern about the main domains of the schema are addressed through the related literature and supported by available statistical data. Originality/value: although previous studies have drawn attention to measures for better evaluation of the construction industry and the built environment, this study, distinctively, presents an integrated approach in order to gauge the true value and impacts of construction in a more comprehensive way. The work's contribution to the body of knowledge is in revealing the hidden input and impact of construction on sustainable development by determining the barriers to this and their solutions, in addition to the proposal of relevant indicators.Publication Open Access Regenerator location problem in flexible optical networks(Informs, 2017) Karasan, Oya Ekin; Department of Industrial Engineering; Yıldız, Barış; Faculty Member; Department of Industrial Engineering; College of Engineering; 258791In this study, we introduce the regenerator location problem in flexible optical networks. With a given traffic demand, the regenerator location problem in flexible optical networks considers the regenerator location, routing, bandwidth allocation, and modulation selection problems jointly to satisfy data transfer demands with the minimum cost regenerator deployment. We propose a novel branch-and-price algorithm for this challenging problem. Using real-world network topologies, we conduct extensive numerical experiments to both test the performance of the proposed solution methodology and evaluate the practical benefits of flexible optical networks. In particular, our results show that, making routing, bandwidth allocation, modulation selection, and regenerator placement decisions in a joint manner, it is possible to obtain drastic capacity enhancements when only a very modest portion of the nodes is endowed with the signal regeneration capability.Publication Open Access Impact of delay announcements in call centers: an empirical approach(Informs, 2017) Ata, B.; Emadi, Sm.; Su, Cl.; Department of Business Administration; Karaesmen, Zeynep Akşin; Faculty Member; Department of Business Administration; College of Administrative Sciences and Economics; 4534We undertake an empirical study of the impact of delay announcements on callers' abandonment behavior and the performance of a call center with two priority classes. A Cox regression analysis reveals that in this call center, callers' abandonment behavior is affected by the announcement messages heard. To account for this, we formulate a structural estimation model of callers' (endogenous) abandonment decisions. In this model, callers are forward-looking utility maximizers and make their abandonment decisions by solving an optimal stopping problem. Each caller receives a reward from service and incurs a linear cost of waiting. The reward and per-period waiting cost constitute the structural parameters that we estimate from the data of callers' abandonment decisions as well as the announcement messages heard. The call center performance is modeled by a Markovian approximation. The main methodological contribution is the definition of an equilibrium in steady state as one where callers' expectation of their waiting time, which affects their (rational) abandonment behavior, matches their actual waiting time in the call center, as well as the characterization of such an equilibrium as the solution of a set of nonlinear equations. A counterfactual analysis shows that callers react to longer delay announcements by abandoning earlier, that less patient callers as characterized by their reward and cost parameters react more to delay announcements, and that congestion in the call center at the time of the call affects caller reactions to delay announcements.Publication Open Access Transmission of risk preferences from mothers to daughters(Elsevier, 2017) Alan, Şule; Boneva, Teodora; Crossley, Thomas F.; Department of Psychology; Department of Economics; Baydar, Nazlı; Ertaç, Seda; Faculty Member; Faculty Member; Department of Psychology; Department of Economics; Graduate School of Social Sciences and Humanities; College of Administrative Sciences and Economics; 50769; 107102We study the transmission of risk attitudes in a unique survey of mothers and children in which both participated in an incentivized risk preference elicitation task. We document that risk preferences are correlated between mothers and children when the children are just 7-8 years old. This correlation is only present for daughters. We further show that a measure of maternal involvement is a strong moderator of the association between mothers' and daughters' risk tolerance. This is consistent with a role for socialization and parental investment in the intergenerational transmission of risk preferences.Publication Open Access Stochastic cyclic scheduling problem in synchronous assembly and production lines(Taylor _ Francis, 1998) Department of Business Administration; Tan, Barış; Karabatı, Selçuk; Faculty Member; Faculty Member; Department of Business Administration; College of Administrative Sciences and Economics; 28600; 38819In this paper we address the stochastic cyclic scheduling problem in synchronous assembly and production lines. Synchronous lines are widely used in the production and assembly of various goods such as automobiles or household appliances. We consider cycle time minimisation (or throughput rate maximisation) as the objective of the scheduling problem with the assumption that the processing times are independent random variables. We first discuss the two-station case and present a lower bounding scheme and an approximate solution procedure for the scheduling problem. For the general case of the problem, two heuristic solution procedures are presented. An extension of the two-station lower bound to the general case of the problem is also discussed. The performance of the proposed heuristics on randomly generated problems is documented, and the impact of scheduling decisions on problems with different levels of variability in processing times are analysed. We also analyse the problem of sequence determination when the available information is limited to the expected values of individual processing times.Publication Open Access The r-interdiction selective multi-depot vehicle routing problem(Wiley, 2019) Sadati, Mir Ehsan Hesam; Aras, Necati; Department of Business Administration; Aksen, Deniz; Faculty Member; Department of Business Administration; College of Administrative Sciences and Economics; 40308The protection of critical facilities has been attracting increasing attention in the past two decades. Critical facilities involve physical assets such as bridges, railways, power plants, hospitals, and transportation hubs among others. In this study we introduce a bilevel optimization problem for the determination of the most critical depots in a vehicle routing context. The problem is modeled as an attacker-defender game (Stackelberg game) from the perspective of an adversary agent (the attacker) who aims to inflict maximum disruption on a routing network. We refer to this problem as the r-interdiction selective multi-depot vehicle routing problem (RI-SMDVRP). The attacker is the decision maker in the upper level problem (ULP) who chooses r depots to interdict with certainty. The defender is the decision maker in the lower level problem (LLP) who optimizes the vehicle routes in the wake of the attack. The defender has to satisfy all customer demand either using the remaining depots or through outsourcing to a third party logistics service provider. The ULP is solved through exhaustive enumeration, which is viable when the cardinality of interdictions does not exceed five among nine depots. For the LLP we implement a tabu search heuristic adapted to the selective multi-depot VRP. Our results are obtained on a set of RI-SMDVRP instances synthetically constructed from standard MDVRP test instances.Publication Open Access Data analytics for operational risk management(Wiley, 2020) Araz, Özgur Merih; Choi, Tsan-Ming; Olson, David L.; Department of Industrial Engineering; Salman, Fatma Sibel; Faculty Member; Department of Industrial Engineering; College of Engineering; 178838