Conformal and related changes of metric on the product of two almost contact metric manifolds

This paper studies conformal and related changes of the product metric on the product of two almost contact metric manifolds. It is shown that if one factor is Sasakian, the other is not, but that locally the second factor is of the type studied by Kenmotsu. The results are more general and given in terms of trans-Sasakian, α-Sasakian and β-Kenmotsu structures

Conformal and related changes of metric on the product of two almost contact metric manifolds

This paper studies conformal and related changes of the product metric on the product of two almost contact metric manifolds. It is shown that if one factor is Sasakian, the other is not, but that locally the second factor is of the type studied by Kenmotsu. The results are more general and given in terms of trans-Sasakian, α-Sasakian and β-Kenmotsu structures

A GIS-based analysis of the rationale behind Roman roads. The case of the so-called VIA XVII (NW Iberian Peninsula)

This is the final version. Available on open access from the University of the Aegean via the DOI in this recordThe aim of this paper is to dig deeper in order to gain a better understanding of the territorial logic of Roman roads, following some recent approaches based on the use of digital modelling tools. Taking the case of the so-called via XVII (a ca. 330 km itinerary which joined Bracara Augusta and Asturica Augusta, NW Iberian Peninsula), the paper explores various factors, both natural and cultural, which may have been determinant in the layout of main roads in the Roman period. This study has followed a non-reconstructive methodology based on the theoretical idea of "least-cost paths" implemented by way of GIS tools. The analysis combines different variables which have an impact on human mobility (such as terrain slope and altitude, and the a priori existence of some primary nodes) and different spatial scales of analysis. As an outcome, we have achieved a detailed understanding of the factors behind the layout of this road and, in doing so, we have also drawn some conclusions regarding the historical context of its origin and development. The methodology and some of the results may be pertinent for the analysis of Roman roads elsewhere and, to some extent, for the wider analysis of ancient roads

A Project Portfolio Management Approach to Tacklingthe Exploration/Exploitation Trade-off

Organizational ambidexterity (OA) is an essen-tial capability for surviving in dynamic business environ-ments that advocates the simultaneous engagement inexploration and exploitation. Over the last decades,knowledge on OA has substantially matured, coveringinsights into antecedents, outcomes, and moderators of OA.However, there is little prescriptive knowledge that offersguidance on how to put OA into practice and to tackle thetrade-off between exploration and exploitation. To addressthis gap, the authors adopt the design science researchparadigm and propose an economic decision model asartifact. The decision model assists organizations inselecting and scheduling exploration and exploitation pro-jects to become ambidextrous in an economically reason-able manner. As for justificatory knowledge, the decisionmodel draws from prescriptive knowledge on projectportfolio management and value-based management, andfrom descriptive knowledge related to OA to structure thefield of action. To evaluate the decision model, its designspecification is discussed against theory-backed designobjectives and with industry experts. The paper alsoinstantiates the decision model as a software prototype andapplies the prototype to a case based on real-world data