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ACM Transactions on Management Information Systems
Innovation is a very important concern for both managers and governmental policy makers. There is... more Innovation is a very important concern for both managers and governmental policy makers. There is an important interplay between security and technology innovation that is largely unrecognized in the literature. This research considers the case where technology innovation in the form of additional product features increases demand through greater functionality. However, the likelihood of a security breach increases with the number of product features as the features interact in unintended ways, thereby increasing the attack surface. Using a two-stage game, we demonstrate how potential demand changes (from direct risk or externalities) impact firm technology innovation strategy. The analysis shows that the type and extent of customer demand reaction has a significant impact on innovative feature development. This research identifies two potential impacts on the level of innovation that can be strategically managed - the impact of externalities on demand and industry risk - explaining...
In this paper we develop tactical and strategic models for assignments of customers to satellite ... more In this paper we develop tactical and strategic models for assignments of customers to satellite channels. We solve this problem using mixed integer-linear programming, and study the managerial impacts of our models. As a managerial tool, the optimal placement of customer channels to minimize transponder re-balancing was found to have a real and observable profit potential in excess of $54 million for the GE Spacenet series geosynchronous orbit satellites. Further managerial findings and computational results are presented. ________________________________________________________________________
ACM Transactions on Management Information Systems, 2020
Untrustworthy content such as fake news and clickbait have become a pervasive problem on the Inte... more Untrustworthy content such as fake news and clickbait have become a pervasive problem on the Internet, causing significant socio-political problems around the world. Identifying untrustworthy content is a crucial step in countering them. The current best practices for identification involve content analysis and arduous fact-checking of the content. To complement content analysis, we propose examining websites’ third-parties to identify their trustworthiness. Websites utilize third-parties, also known as their digital supply chains, to create and present content and help the website function. Third-parties are an important indication of a website's business model. Similar websites exhibit similarities in the third-parties they use. Using this perspective, we use machine learning and heuristic methods to discern similarities and dissimilarities in third-party usage, which we use to predict trustworthiness of websites. We demonstrate the effectiveness and robustness of our approach...
Abstract The Internet is host to many sites that collect vast amounts of opinions about products ... more Abstract The Internet is host to many sites that collect vast amounts of opinions about products and services. These opinions are expressed in written language, and this paper presents a method for modeling the aspects of overall customer satisfaction from free-form written opinions. Written opinions constitute unstructured input data, which are first transformed into semi-structured data using an existing method for aspect-level sentiment analysis. Next, the overall customer satisfaction is modeled using a Bayesian approach based on the individual aspect rating of each review. This probabilistic method enables the discovery of the relative importance of each aspect for every unique product or service. Empirical experiments on a data set of online reviews of California State Parks, obtained from TripAdvisor, show the effectiveness of the proposed framework as applied to the aspect-level sentiment analysis and modeling of customer satisfaction. The accuracy in terms of finding the significant aspects is 88.3%. The average R 2 values for predicted overall customer satisfaction using the model range from 0.892 to 0.999.
We find evidence that customers evaluate services according to different rules depending on wheth... more We find evidence that customers evaluate services according to different rules depending on whether the overall service experience impression is negative or positive. The functional form by which the underlying service attributes are mapped into an overall satisfaction evaluation is compensatory in the former (negative) case and has conjunctive properties in the latter (positive) case. These findings are based on an examination of a large data set of outpatient healthcare customer satisfaction surveys. We conjecture that different cognitive processes are at work for positive versus negative service encounters.
The Shortest Covering Path Problem (SCPP) is one of identifying the least cost path from a pre-sp... more The Shortest Covering Path Problem (SCPP) is one of identifying the least cost path from a pre-specified starting node to a pre-specified terminus node. The path is constrained by the condition that it must cover every node in the network. A node is considered to be covered if it is within some pre-specified covering distance of a node on the path. This SCPP has many potential applications, especially in hierarchical network design, and bi-modal routing problems. In this paper we introduce two efficient algorithms for solving the SCPP. The first is a heuristic based upon a Lagrangian relaxation of the problem. The second is an exact algorithm based upon a branch and bound procedure which utilizes the bounds generated by the Lagrangian relaxation scheme. Computational tests indicate that both procedures are very efficient. The heuristic identified and verified the optimal solution for 135 of the 160 test problems solved. The optimal solution to the remaining 25 problems was readily i...
Since 1996, several major free ISP services have been founded in the US and elsewhere, including ... more Since 1996, several major free ISP services have been founded in the US and elsewhere, including Spinway, Inc. Spinway's services were offered primarily through, and under the name of, large consumer companies such as Yahoo!, KMart, Costco, Spiegel, Barnes & Noble, Ace Hardware, and NBC among others. By early 2001, the free ISP market had been reduced severely, primarily due to the lack of revenues associated with such “free” services. Spinway, founded in 1998, was a major, and perhaps the largest, free ISP in the US with over 6 million customers at its peak. Spinway folded in December of 2000, and the remains of their services were taken over by Kmart's BlueLight.com. In November of 2002, BlueLight.com was sold to United Online and the ISP services available through BlueLight.com are no longer free. This teaching case discusses the viability of free digital infrastructures, such as Internet Service Providers (ISP). We seek to highlight and learn from the general issues expe...
We study a make-to-order manufacturing system consisting of several processing centers that are s... more We study a make-to-order manufacturing system consisting of several processing centers that are subject to failures and repairs. Our objective is to build a model that can be used as a tool for negotiating the delivery date and the price of a certain upcoming order. The model takes into account the congestion level of the shop floor at the time the order is placed. Based on the workload of the processing centers, the model splits the order into lots and assigns them to the processing centers so as to determine the order completion time ...
Abstract. This paper proposes a new formulation for the bandwidth packing problem, assuring maxim... more Abstract. This paper proposes a new formulation for the bandwidth packing problem, assuring maximum service delay in telecommunications networks. The bandwidth packing problem is one of selecting calls, from a list of requests, to be routed in the network. We limit the maximum queueing delay, while maximizing revenues generated from the routed calls. An efficient Lagrangean relaxation based heuristic procedure for finding bounds and solutions to the problem is demonstrated, and computational results from a variety of ...
Abstract The uniform graph partitioning problem can be described as partitioning the nodes of a g... more Abstract The uniform graph partitioning problem can be described as partitioning the nodes of a graph into two sets of equal size to minimize the sum of the cost of arcs having end-points in different sets. This problem has important applications in VLSI design, computer compiler design, and in placement and layout problems. The problem is known to be NP-complete. In this paper we propose a new heuristic procedure for solving the graph partitioning problem. This heuristic is based on a genetic algorithm with features tailored ...
... We have developed a new hybrid neural network to solve optimization problems. ... within each... more ... We have developed a new hybrid neural network to solve optimization problems. ... within each row) BSij(\ -õxy) (inhibitory connections within each column) -C (global inhibition) -DdxY ... many Hopfield-type neural networks developed since the first Hopfield model (Hopfield, 1982 ...
ACM Transactions on Management Information Systems
Innovation is a very important concern for both managers and governmental policy makers. There is... more Innovation is a very important concern for both managers and governmental policy makers. There is an important interplay between security and technology innovation that is largely unrecognized in the literature. This research considers the case where technology innovation in the form of additional product features increases demand through greater functionality. However, the likelihood of a security breach increases with the number of product features as the features interact in unintended ways, thereby increasing the attack surface. Using a two-stage game, we demonstrate how potential demand changes (from direct risk or externalities) impact firm technology innovation strategy. The analysis shows that the type and extent of customer demand reaction has a significant impact on innovative feature development. This research identifies two potential impacts on the level of innovation that can be strategically managed - the impact of externalities on demand and industry risk - explaining...
In this paper we develop tactical and strategic models for assignments of customers to satellite ... more In this paper we develop tactical and strategic models for assignments of customers to satellite channels. We solve this problem using mixed integer-linear programming, and study the managerial impacts of our models. As a managerial tool, the optimal placement of customer channels to minimize transponder re-balancing was found to have a real and observable profit potential in excess of $54 million for the GE Spacenet series geosynchronous orbit satellites. Further managerial findings and computational results are presented. ________________________________________________________________________
ACM Transactions on Management Information Systems, 2020
Untrustworthy content such as fake news and clickbait have become a pervasive problem on the Inte... more Untrustworthy content such as fake news and clickbait have become a pervasive problem on the Internet, causing significant socio-political problems around the world. Identifying untrustworthy content is a crucial step in countering them. The current best practices for identification involve content analysis and arduous fact-checking of the content. To complement content analysis, we propose examining websites’ third-parties to identify their trustworthiness. Websites utilize third-parties, also known as their digital supply chains, to create and present content and help the website function. Third-parties are an important indication of a website's business model. Similar websites exhibit similarities in the third-parties they use. Using this perspective, we use machine learning and heuristic methods to discern similarities and dissimilarities in third-party usage, which we use to predict trustworthiness of websites. We demonstrate the effectiveness and robustness of our approach...
Abstract The Internet is host to many sites that collect vast amounts of opinions about products ... more Abstract The Internet is host to many sites that collect vast amounts of opinions about products and services. These opinions are expressed in written language, and this paper presents a method for modeling the aspects of overall customer satisfaction from free-form written opinions. Written opinions constitute unstructured input data, which are first transformed into semi-structured data using an existing method for aspect-level sentiment analysis. Next, the overall customer satisfaction is modeled using a Bayesian approach based on the individual aspect rating of each review. This probabilistic method enables the discovery of the relative importance of each aspect for every unique product or service. Empirical experiments on a data set of online reviews of California State Parks, obtained from TripAdvisor, show the effectiveness of the proposed framework as applied to the aspect-level sentiment analysis and modeling of customer satisfaction. The accuracy in terms of finding the significant aspects is 88.3%. The average R 2 values for predicted overall customer satisfaction using the model range from 0.892 to 0.999.
We find evidence that customers evaluate services according to different rules depending on wheth... more We find evidence that customers evaluate services according to different rules depending on whether the overall service experience impression is negative or positive. The functional form by which the underlying service attributes are mapped into an overall satisfaction evaluation is compensatory in the former (negative) case and has conjunctive properties in the latter (positive) case. These findings are based on an examination of a large data set of outpatient healthcare customer satisfaction surveys. We conjecture that different cognitive processes are at work for positive versus negative service encounters.
The Shortest Covering Path Problem (SCPP) is one of identifying the least cost path from a pre-sp... more The Shortest Covering Path Problem (SCPP) is one of identifying the least cost path from a pre-specified starting node to a pre-specified terminus node. The path is constrained by the condition that it must cover every node in the network. A node is considered to be covered if it is within some pre-specified covering distance of a node on the path. This SCPP has many potential applications, especially in hierarchical network design, and bi-modal routing problems. In this paper we introduce two efficient algorithms for solving the SCPP. The first is a heuristic based upon a Lagrangian relaxation of the problem. The second is an exact algorithm based upon a branch and bound procedure which utilizes the bounds generated by the Lagrangian relaxation scheme. Computational tests indicate that both procedures are very efficient. The heuristic identified and verified the optimal solution for 135 of the 160 test problems solved. The optimal solution to the remaining 25 problems was readily i...
Since 1996, several major free ISP services have been founded in the US and elsewhere, including ... more Since 1996, several major free ISP services have been founded in the US and elsewhere, including Spinway, Inc. Spinway's services were offered primarily through, and under the name of, large consumer companies such as Yahoo!, KMart, Costco, Spiegel, Barnes & Noble, Ace Hardware, and NBC among others. By early 2001, the free ISP market had been reduced severely, primarily due to the lack of revenues associated with such “free” services. Spinway, founded in 1998, was a major, and perhaps the largest, free ISP in the US with over 6 million customers at its peak. Spinway folded in December of 2000, and the remains of their services were taken over by Kmart's BlueLight.com. In November of 2002, BlueLight.com was sold to United Online and the ISP services available through BlueLight.com are no longer free. This teaching case discusses the viability of free digital infrastructures, such as Internet Service Providers (ISP). We seek to highlight and learn from the general issues expe...
We study a make-to-order manufacturing system consisting of several processing centers that are s... more We study a make-to-order manufacturing system consisting of several processing centers that are subject to failures and repairs. Our objective is to build a model that can be used as a tool for negotiating the delivery date and the price of a certain upcoming order. The model takes into account the congestion level of the shop floor at the time the order is placed. Based on the workload of the processing centers, the model splits the order into lots and assigns them to the processing centers so as to determine the order completion time ...
Abstract. This paper proposes a new formulation for the bandwidth packing problem, assuring maxim... more Abstract. This paper proposes a new formulation for the bandwidth packing problem, assuring maximum service delay in telecommunications networks. The bandwidth packing problem is one of selecting calls, from a list of requests, to be routed in the network. We limit the maximum queueing delay, while maximizing revenues generated from the routed calls. An efficient Lagrangean relaxation based heuristic procedure for finding bounds and solutions to the problem is demonstrated, and computational results from a variety of ...
Abstract The uniform graph partitioning problem can be described as partitioning the nodes of a g... more Abstract The uniform graph partitioning problem can be described as partitioning the nodes of a graph into two sets of equal size to minimize the sum of the cost of arcs having end-points in different sets. This problem has important applications in VLSI design, computer compiler design, and in placement and layout problems. The problem is known to be NP-complete. In this paper we propose a new heuristic procedure for solving the graph partitioning problem. This heuristic is based on a genetic algorithm with features tailored ...
... We have developed a new hybrid neural network to solve optimization problems. ... within each... more ... We have developed a new hybrid neural network to solve optimization problems. ... within each row) BSij(\ -õxy) (inhibitory connections within each column) -C (global inhibition) -DdxY ... many Hopfield-type neural networks developed since the first Hopfield model (Hopfield, 1982 ...
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Papers by Erik Rolland