RPMInter-work: a multi-agent approach for planning the task-role assignments in inter-organisational workflow

ABSTRACT

Workflow management is a core component of modern Enterprise Information Systems (EISs) infrastructure that automates the execution of critical business processes. One of the particular interests of the security community is how to ensure the completion of the workflow execution in the presence of authorisation constraints. These constraints present some restrictions on the users or the roles that are authorised to execute the workflow tasks. The goal is to enforce the legal assignments of access privileges to the executors of the workflow tasks. Despite the variety of approaches proposed in this context, an approach dedicated to the inter-organisational workflows is still missing. In this paper, we take a step towards this goal by proposing a multi-agent-based model, named RPMInter-Work (task-Role assignment Planning Model for Inter-organisational Workflow). Our approach aims to perform the planning of the task-role assignments in inter-organisational workflow in presence of authorisation constraints that are related to task-role assignments. In our research work, this planning problem is formulated as a DisCSP (Distributed Constraint Satisfaction Problem). Our proposed contribution is based on the requirements of inter-organisational workflows, in particular, the autonomy of the participating organisations and the respect of their privacy. A prototype of RPMInter-Work is implemented using JADE (Java Agent DEvelopment) platform and some evaluation results of this prototype are exposed in this paper.     

Post-entry internationalization speed of SMEs: The role of relational mechanisms and foreign market knowledge

Prior research shows that small and medium-sized enterprises (SMEs) can utilize domestic networks with internationally experienced partners to accelerate their internationalization process. Yet, there is a lack of clarity and limited empirical evidence regarding the role of relational mechanisms within these networks in driving post-entry internationalization speed (PIS) of SMEs. To address this gap, this study examines the relational mechanisms-PIS relationship by drawing insights from the relational view to argue that foreign market knowledge mediates the relationship between relational mechanisms and PIS. The hypothesized study model is tested using a structural equation modelling (SEM) technique on a sample of 394 UK based manufacturing SMEs. Our results show that foreign market knowledge acquisition from domestic networks fully mediates the relationship between relational mechanisms and PIS. Additionally, the linkage between foreign market knowledge acquisition and PIS is moderated by domestic environmental hostility, such that the relationship is strengthened when domestic environmental hostility increases. We discuss the contributions and implications of our results and suggest opportunities for future research.     

The influence of scarcity cues and price bundling on menu item selection

Judgmental heuristics are applied in an experiment investigating the influence of availability cues on restaurant purchase decisions. Participants evaluated menu items in a restaurant scenario that manipulated scarcity cues, bundling, and price. The findings indicate that server scarcity influences food choice more than menu scarcity. Bundled pricing reduces selection of a limited quantity item compared to a la carte pricing. Participants will pay more for a scarce item with a scarcity message delivered by the server. The findings suggest that restaurants can promote menu items effectively through server delivery, but those items should not be part of a price bundle.     

The performance of cross-sectional regression tests of the CAPM with non-zero pricing errors

We show that in the presence of non-zero pricing errors, the Fama–MacBeth (FM) cross-sectional regression test is very likely to either reject the Capital Asset Pricing Model (CAPM) when it (almost) holds or accept the model when it grossly fails. We investigate the case when pricing errors are correlated with betas and demonstrate that the test performance depends crucially on the correlation, cross-sectional distribution of betas, and several other parameter values. Even when the CAPM holds exactly (pricing errors are zero) the FM test is equally likely to either reject or accept the model when typical sample sizes are used.     

Does Idiosyncratic Risk Matter for Individual Securities?

This paper investigates the relationship between idiosyncratic risk and returns for individual securities within a generalized autoregressive conditional heteroskedascticity (GARCH)‐in‐mean framework. We demonstrate that, on average, 15% of stocks exhibit a significant relationship between returns and risk, of which 9% are positive. These proportions vary over time and with model specifications. Some characteristics influence the probability of a positive and a negative relationship, while others appear to affect only one, but not the other. This evidence implies that the factors that explain a positive connection between idiosyncratic risk and returns are different from the factors that explain a negative connection.     

A contribution to a multidimensional analysis of trade competition

International trade grew substantially throughout the last decades and international relations became more important for the economic performance of the countries. Simultaneously, new poles emerged in the international arena leading to growing competition for higher market shares. Therefore, trade competition is a critical dimension of analysis for applied international trade studies. We propose a conceptual framework for measuring this phenomenon by combining some critical previous contributions to build a multidimensional and more comprehensive concept, which defines trade competition as a function of the degree of both structural similarity and total exports overlap. Moreover, structural similarity should take into account three elements: sectoral shares similarity, inter‐sectoral similarity (evaluating how different the distinct sectors are) and intra‐sectoral similarity (proximity in terms of quality ranges exported). Several measures are proposed to empirically capture the concept suggested. Finally, we present an example including the exports of six European economies (Germany, France, the United Kingdom, Greece, Hungary and Sweden) to 124 destination markets (in 2007, 2011, 2015) in order to illustrate the application of the concept and measures suggested.     

Does gender diversity on corporate boards increase risk‐taking?

We study the impact of board gender diversity on firm risk‐taking in a developing market. Our study is drawn from a sample of 30 Tunisian‐listed firms between 1997 and 2010. First, we found that women have a risk perception that leads to risk avoidance behaviour: the presence of women directors, even when there is one woman director, is positively associated with cash ratio. Second, we showed no significant relationship between board gender diversity and the propensity to take strategic or financial risk‐taking. Third, the presence of state officer/bureaucrats and/or politically connected women have a positive effect on cash holding and investment opportunities. Finally, we found that foreign investors do not invest in firms with gender‐diverse boards. We conclude with a discussion of contributions to scholarship and practice, and present avenues for future research. Copyright © 2015 ASAC. Published by John Wiley & Sons, Ltd.     

Do hedge funds trade on private information? Evidence from syndicated lending and short-selling

This paper investigates an important contemporary issue relating to the involvement of hedge funds in the syndicated loan market. In particular, we investigate the potential conflicts of interest that arise when hedge funds make syndicated loans and take short positions in the equity of borrowing firms. We find evidence consistent with the short-selling of the equity of the hedge fund borrowers prior to public announcements of both loan originations and loan amendments. We also find that hedge funds are more likely to lend to highly leveraged, lower credit quality firms, where access to private information is potentially the most valuable and where trading on such information could lead to enhanced profits. Overall, our results have important implications for the current debate regarding regulating the hedge fund industry.     

Surface movement ground control by means of a GPS–GIS system

Despite the traffic increases at the World's airports, little works have been done on methodologies to improve vehicles and airplanes ground control. This may be leading to reduced safety. Here an integrated system is developed to help guarantee suitable separations of land vehicles and airplanes moving on the airport ground area It can also addressed issues of the optimal use of taxi and runways. The system is composed of global positioning systems hardware, checks on the position of land vehicles and airplanes on the ground in real time, and special-purpose geographical information systems software for the tracking of land vehicles and airplanes within different planning operations.