Search results for "Information Systems."
showing 10 items of 1545 documents
A survey of variants and extensions of the location-routing problem
2015
This is a review of the literature on variants and extensions of the standard location-routing problem published since the last survey, by Nagy and Salhi, appeared in 2006. We propose a classification of problem variants, provide concise paper excerpts that convey the central ideas of each work, discuss recent developments in the field, and list promising topics for further research.
A real options game of alliance timing decisions in biopharmaceutical research and development
2017
Abstract In this article we examine the alliance timing trade-off facing both pharmaceutical and biotech firms in a stochastic and competitive environment. Specifically, we introduce a real options game (ROG), where a pharmaceutical company can choose between two competing biotech firms by sequentially offering a licensing deal early or late in the new drug development process. We find that, when the alliance raises the drug market value significantly, the agreement is signed late in the drug development process. This suggests that the postponement effect implied by the use of real options prevails over the biotech firms’ competition effect, which would instead play in favor of an early agr…
The role of the distribution platform in price formation of paid apps
2015
In this paper we study the role of the distribution platform as an important determinant of price of paid apps. We also examine how the distribution platform influences the price implications of important developers' app-level decisions. To these purposes, we construct a hierarchical model of price formation by using an ad-hoc panel dataset consisting of top paid apps from the two major app stores, namely Apple's App Store and Google Play. Our findings show that prices of paid apps strongly depend on the platform where the apps are marketed. Specifically, the App Store is associated with lower prices for paid apps than Google Play. We find evidence that this is because the impact of cross-s…
The Hierarchical Mixed Rural Postman Problem: Polyhedral analysis and a branch-and-cut algorithm
2017
[EN] The Hierarchical Mixed Rural Postman Problem is defined on a mixed graph where arcs and edges that require a service are divided into clusters' that have to be serviced in a hierarchical order. The problem generalizes the Mixed Rural Postman Problem and thus is NP-hard. In this paper, we provide a polyhedral analysis of the problem and propose a branch-and-cut algorithm for its solution based on the introduced classes of valid inequalities. Extensive computational experiments are reported on benchmark instances. The exact approach allows to find the optimal solutions in less than 1 hour for instances with up to 999 vertices, 2678 links, and five clusters.
Information Flows Among the Major Stock Market Areas
2001
The relationship between the index returns of the major stock markets has been analysed in many papers. These studies usually examine lead–lag relationships between markets, without distinguishing the influencing ability and the sensitivity of each of the markets. Additionally, these studies use indices that are not directly comparable — either because of the way the indices are calculated or because of the number of companies and sectors used to construct them. This paper addresses both points. First, all the analyses have been made using homogeneous indices designed by Morgan Stanley Capital International. Secondly, the information flow has been studied by applying the model proposed by P…
Using stage theorizing to make anti-phishing recommendations more effective
2018
Purpose This paper aims to review the behavioral phishing literature to understand why anti-phishing recommendations are not very effective and to propose ways of making the recommendations more effective. The paper also examines how the concept of stages from health communication and psychology can be used to make recommendations against phishing more effective. Design/methodology/approach This literature review study focused on the behavioral phishing literature that has relied on human subjects. Studies were excluded for reasons that included lacking practical recommendations and human subjects. Findings The study finds that phishing research does not consider where victims are residing…
Effectual tactics in digital intrapreneurship: A process model
2020
Abstract Uncertainty and the pursuit of new ventures are intricately linked. Digital technologies open up new ways for uncertainty handling in the pursuit of novelty. In this paper, we develop a process model that traces the dynamics among uncertainty, digitally enabled tactics, and organizational novelty. The model points to the potential of technologies that are evocative, disposable, and responsive for venturing in complex, uncertainty-ridden contexts. Our research builds on extant conceptualizations of complexity in innovation journeys, in conjunction with perspectives on effectual entrepreneurial tactics. Empirically, we investigate uncertainty handling through a longitudinal case stud…
Probabilistic quantum clustering
2020
Abstract Quantum Clustering is a powerful method to detect clusters with complex shapes. However, it is very sensitive to a length parameter that controls the shape of the Gaussian kernel associated with a wave function, which is employed in the Schrodinger equation with the role of a density estimator. In addition, linking data points into clusters requires local estimates of covariance which requires further parameters. This paper proposes a Bayesian framework that provides an objective measure of goodness-of-fit to the data, to optimise the adjustable parameters. This also quantifies the probabilities of cluster membership, thus partitioning the data into a specific number of clusters, w…
Exploring the relationships between tangible and intangible resources in a learning alliance dynamics: comment on the paper by Kapmeier
2008
Kapmeier (2008) focuses his research on common learning and firms’ opportunistic behaviour in learning alliances. A strategic alliance, as clearly stated by Gulati (1998, p. 293) is a voluntary arrangement between firms to exchange and share knowledge as well as resources with the intent of developing processes, products or services. This is a relevant topic not only for those firms that operate in industries characterized typically by high RD Larsson et al., 1998). Furthermore, this literature essentially takes a static view and it often neglects the postformation dynamics of alliances (Koza and Lewin, 2000; Das and Teng, 2001). Some key questions not yet profoundly investigated are: how c…
ERP system implementation in SMEs: exploring the influences of the SME context
2012
Small and medium-sized enterprises SMEs are increasingly implementing enterprise resource planning ERP systems. Compared to large enterprises, SMEs differ in a number of inherent characteristics, which are likely to impact the ERP system implementations. The purpose of this study is to explore these influences of the SME context on the ERP system implementation process. SME characteristics are synthesised from relevant literature and the influences of the contextual factors on various activities across the ERP life cycle are investigated. The study presents findings from a multiple case study of four SMEs. The ownership type of the companies and limited resources were identified as the most…