Yael PerlmanBar Ilan University | BIU · Department of Management
Yael Perlman
PhD
About
54
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Introduction
Skills and Expertise
Additional affiliations
October 2004 - present
Education
October 1997 - December 2000
October 1991 - July 1994
October 1985 - July 1988
Publications
Publications (54)
This paper investigates co-exposure management in multi-class queueing systems, introducing generalizable measures to quantify customer exposure. We define two key metrics: the co-exposure count and the co-exposure duration. Our results reveal that the expected co-exposure measures are intricately linked to the first and second moments of the queue...
Inventory planning in fashion markets is highly challenging, owing to uncertain demand; yet, in making inventory decisions, retailers may be able to capitalise on high substitutability between products. This research develops single-period inventory-management models describing a market with two substitutable products, under stockout-based substitu...
Problem definition: In a Markovian queueing system with strategic customers, a reward is gained from completing service, and a loss is incurred while waiting to be served. The common assumption in the queueing literature is that such loss is a function of the customer’s waiting time. This paper takes a different and novel approach in that it models...
In healthcare institutions, reporting and handling of near-miss events—events that could have resulted in catastrophe but did not—are considered crucial to patient safety. Empirical studies have explored factors that influence near-miss reporting behavior in specific healthcare settings, yet they are limited in their capacity to provide general ins...
Several types of network and non-network licenses control users’ access to software. The literature on efficient selection of software licenses has mostly addressed queuing models intended to estimate the probability of denial of access for a user. Under that approach, however, the lower one sets the rejection probability, the greater the likelihoo...
Firms may misreport income or fail to comply with environmental regulations. This study contributes to the growing literature that analyzes dynamic history-dependent compliance monitoring, under which penalties or monitoring frequency are selected on the basis of recent compliance history. The current study develops methods for evaluating and compa...
In the apparel market's dynamic environment, fashion firms aim to successfully forecast both the desirability of new collections and the volume of each item to be produced and released in the market under conditions of uncertainty. This research study proposes an inventory-management model developed for substitutable products (sold in several versi...
Resource shortages, environmental degradation, and pollution have forced businesses to change their business practices to become more sustainable. In addition, consumers increasingly demand eco-friendly products. This paper examines whether governments should privatize a company whose production process generates environmental pollution. We assume...
This paper investigates whether an e-tailer should act as a platform and offer customers the product of a seller who can reach customers only through the e-tailer, and if so, what type of contract to offer the seller: a proportional commission based on revenue or a fixed fee per unit sold. The e-tailer also chooses the product line design: offer on...
The usual negative effect of queue size on arrival to an M/M/c service facility is augmented, in this paper, by the negative network effect due to waiting with others, which increases as the exposure to others increases. The reward and cost structure acquires a new meaning, as the cost of exposure to later arrivals needs to be considered, on top of...
We analyze a dual-channel supply chain comprising two suppliers that offer vertically-differentiated agricultural products; specifically, one offers an organic version of an agricultural product and the other offers a conventionally-grown version of the same product. Each supplier distributes his product through two channels: directly to consumers...
This paper studies a duopolistic market consisting of a conventional offline retailer and an online retailer, each of whom offers a competing benefit (attribute): Specifically, the conventional retailer is superior in terms of social aspects of the shopping experience, such as helpfulness of salespeople, whereas the online retailer offers the possi...
This paper addresses the formulation of an individual fruit harvest decision as a nonlinear programming problem to maximize profit, while considering selective harvesting based on fruit maturity. A model for the operational level decision was developed and includes four features: time window constraints, resource limitations, yield perishability, a...
Distribution platforms use a consignment contract with revenue sharing when interacting with their app developers. In such a contract, the developer continues to own the app and typically bears sole responsibility for determining its selling price, where for every app sold, the platform charges the developer an agreed-upon percentage of the selling...
The joint distribution of value and local time for Brownian Motion has been reported by Borodin and Salminen. Its asymptotic behavior for recurrent random walk has been presented by Jain and Pruitt. Motivated by the need for queue size control during a pandemic (Hassin, Meilijson and Perlman), the current study presents closed form formulas for ran...
This study considers a retailer and a direct supplier (farmer) facing the strategic decision of whether to interact through a dual channel or to compete by selling different but comparable products. Consumers perceive the supplier's product as being of higher quality (e.g., an organic product as opposed to a conventional product, which is offered b...
The risk of infection from the COVID-19 virus dictates businesses, such as supermarkets and department stores, to impose limits on the maximal number of customers allowed inside a store at any given time. These social distancing constraints generate long queues of waiting customers outside such businesses. This work investigates the impact of infec...
Near-miss safety events—unplanned incidents that reveal the potential for future adverse events—have an important yet complex role in workplace safety: If reported and handled correctly, they can contribute to the improvement of safety procedures, yet if they are mishandled, the likelihood of subsequent adverse events might increase. This research...
The COVID-19 pandemic has forced numerous businesses such as department stores and supermarkets to limit the number of shoppers inside the store at any given time to minimize infection rates. We construct and analyze two models designed to optimize queue sizes and customer waiting times to ensure safety. In both models, customers arrive randomly at...
The research proposes an inventory management model for clothing sold in various colors. The model aims at maximizing the profits of firms, while reducing the costs that result from excess capacity of production or, alternatively, from loss of potential revenues due to low demand while considering the demand dependencies across colors. If the inven...
We consider an n-site tandem stochastic production network where each product moves sequentially through the sites, and
the product’s quality deteriorates with its sojourn time in the system. At each site the product goes through two stages: the
first stage is a processing operation with a generally-distributed random duration. This operation eithe...
Reporting of near-miss safety events is commonly assumed to enhance safety in organizations, as such reporting enables managers to identify and address accident risk factors. An organization's capacity to leverage near-miss events in this way is contingent on cooperation between employees, who must report near-miss events accurately, and managers,...
In this paper, we study the optimal inventory levels of two vertically differentiated products under centralized and competitive settings using a general consumer choice model. Under the assumptions that consumers are heterogeneous and are willing to substitute with the other product if their preferred product is out of stock, we develop an invento...
We explore how reliance on part-time medical staff affects operational and medical outcome performance in two general surgery departments Whereas prior research has indicated that operational performance is positively associated with medical performance, we find that heavier reliance on part-time practice may deteriorate operational performance but...
A two-stage game between an inspector and multiple inspectees is modeled in which the inspector may choose to invest in a monitoring technology in the first stage to supplement the inspector's subsequent inspection strategy in the second-stage simultaneous game. The game is motivated by an environmental regulator that has a limited budget for monit...
We propose a novel approach, based on a Human Leukocyte Antigen (HLA) best-fit criterion, to dynamically allocate live organs (specifically, kidneys) to candidates needing transplantation. A ‘reward’ is assigned to each level of HLA fit, such that higher rewards are attributed to transplants between better-matched candidates and kidneys. We also en...
Two distinct random streams of discrete objects flow into a system and queue in two separate lines. Concurrently, two distinct types of resources arrive stochastically over time. Upon arrival, each resource unit is matched with a waiting object. One resource type is 'flexible' and can be allocated to either one of the object types. However, units o...
We consider pricing decisions of agri-food retailers offering organic versions and non-organic conventional versions of a single agricultural product, where the two product versions differ from each other in terms of their shelf lives and their utility to customers. The latter is captured in a random “valuation” variable distributed among customers...
This paper evaluates mergers and acquisitions (M&A) in a supply chain involving risk-averse parties. In contrast to prior literature, the analysis presented herein suggests that, because of risk considerations, different types of M&A can yield different outcomes. Specifically, we distinguish among three types of M&A arrangements—merger, forward acq...
This paper deals with a short-term production plan of a single toolset during a shift at a semiconductor fabrication plant. We propose a cost-based optimization model that seeks to minimize the cost of the shift while meeting the following conditions: (i) the shift produces its required output, measured in work-in-process (WIP) levels; (ii) Prevent...
The paper provides a thorough investigation of the revenue sharing contract format typically used in the mobile applications (Apps) industry. The platform provider sets the level of revenue sharing, and the App developer determines the investment in quality and the selling price of the App. The demand for an App, which depends on both price and qua...
Consider n mobile application (app) developers selling their software through a common platform provider (retailer), who offers a consignment contract with revenue sharing. Each app developer simultaneously determines the selling price of his app and the extent to which he invests in its quality. The demand for the app, which depends on both price...
The issue of economic design of an control chart is addressed for a batch manufacturing process, subject to Markovian failure characteristics. The objective of this design is to minimise the expected total quality cost per batch. To find the optimal sample size and control limits, a Markov chain model is formulated. There is no analytical solution...
We analyze pricing and protection (digital rights management) strategies in a two-echelon supply chain that consists of a manufacturer and a retailer of digital products. The demand for the legal (non-pirated) product, which depends on both price and monetary investment in protection, is assumed to be uncertain. Three different supply chain models...
We consider a single retailer with a given potential revenue, who sells a product that is subject to shoplifting. In order to decrease losses due to shoplifting and to maximize his profit, the retailer can invest in security measures. In particular, we assume that the retailer purchases security services from a single security supplier. The securit...
The ability to estimate a supplier's marginal cost confers a strategic competitive advantage to the buyer, whether in negotiations with suppliers, in an auction setting, or when an auction is used to initiate the process, which is then followed up with a traditional negotiation. Focusing on electronic reverse auctions characterized by a one-shot, f...
We consider a monopolistic producer offering software that is updated periodically, but, by the end of one period, a pirated version is available at a transaction cost. This presents the consumers, who are different in terms of their willingness to pay for the original compared to the pirated version, with possible strategies for either buying a ne...
We consider a batch production process that can be either stable or unstable, in which inspection is performed offline after production of the batch is completed. The quality of a batch can be estimated with a desired level of certainty by inspecting only a sample of its units. In order to minimise the expected total cost per batch, which includes...
We use path analysis to identify causal relationships between different performance measures in each of the four perspectives defined in the balanced scorecard and examine the influence of time lag on relationships between perspectives. We analyze performance data from a real high-tech company. Our results point to a direct relationship between lea...
We formulate a continuous-time Markov chain model of a transfer line in which there are two unreliable machines separated by a finite buffer. Due to limited repair resources, simultaneous repairs are not possible in cases where both machines fail, and therefore we develop a repair priority rule that depends on the number of work-pieces present in t...
A product family refers to a group of products that have been derived from a common product platform and which are specifically designed to satisfy a variety of market segments. In this paper, we consider a firm utilising product family design in order to respond to the requirements of two consumer segments, each characterised by different quality...
A multi-echelon inventory system implies the existence of a hierarchy of stocking locations, and the dependence and interaction between them. We consider a multi-echelon, spare-part inventory management problem with outsourcing and backordering. The problem is characterized by deterministic repair time/cost, and supply and demand that lie within pr...
This paper considers an inventory system responsible for repairable equipments located at several operational sites, each in different area. When a failure occurs at the operational site, spare parts are required. We analyze a multi-ple-supplier inventory system that includes an internal repair shop that offers several modes of repair with differen...
This paper addresses a problem encountered by a large-scale health service supply chain operating in a periodic review mode.
Due to the vital nature of the products it provides, the number and timing of urgent orders are not limited. As a result,
increasingly high transportation costs are incurred and the problem is to select an inventory replenish...
The internal transfer-prices set by an organization are what an organization's bases 'pay' its service centre, the depot, for its services. Since each base has a limited budget, these transfer-prices control and motivate the base's usage of two types of repair services: normal and expedited. In this paper, we implement a unique approach—transfer-pr...
Inventory systems with limited repair capacity are affected by congestion externalities, caused by use of a shared service. There is incompatibility between individual and system optimisation in considering congestion externalities. Three models are described that investigate the congestion effect in a multi-echelon inventory system which has two m...