A characterization of some families of Cohen--Macaulay, Gorenstein and/or Buchsbaum rings

We provide algorithmic methods to check the Cohen--Macaulayness, Buchsbaumness and/or Gorensteiness of some families of semigroup rings that are constructed from the dilation of bounded convex polyhedrons of $\R^3_{\geq}$. Some families of semigroup rings are given satifying these properties

Key issues on partial least squares (PLS) in operations management research: A guide to submissions

Purpose: This work aims to systematise the use of PLS as an analysis tool via a usage guide or recommendation for researchers to help them eliminate errors when using this tool. Design/methodology/approach: A recent literature review about PLS and discussion with experts in the methodology. Findings: This article considers the current situation of PLS after intense academic debate in recent years, and summarises recommendations to properly conduct and report a research work that uses this methodology in its analyses. We particularly focus on how to: choose the construct type; choose the estimation technique (PLS or CB-SEM); evaluate and report the measurement model; evaluate and report the structural model; analyse statistical power. Research limitations: It was impossible to cover some relevant aspects in considerable detail herein: presenting a guided example that respects all the report recommendations presented herein to act as a practical guide for authors; does the specification or evaluation of the measurement model differ when it deals with first-order or second-order constructs?; how are the outcomes of the constructs interpreted with the indicators being measured with nominal measurement levels?; is the Confirmatory Composite Analysis approach compatible with recent proposals about the Confirmatory Tetrad Analysis (CTA)? These themes will the object of later publications. Originality/value: We provide a check list of the information elements that must contain any article using PLS. Our intention is for the article to act as a guide for the researchers and possible authors who send works to the JIEM (Journal of Industrial and Engineering Management). This guide could be used by both editors and reviewers of JIEM, or other journals in this area, to evaluate and reduce the risk of bias (Losilla, Oliveras, Marin-Garcia & Vives, 2018) in works using PLS as an analysis procedure

Exploring the Relationship Between R&D and Productivity: A Country-Level Study

Research and development (R&D) has been considered a source of growth in productivity starting from Schultz (1953). Since then, significant research has studied this relationship at the firm, industry and country level. However, at the country level, most of the empirical studies assessing the R&D-productivity relationship often fail to consider the possible simultaneity of these variables. Do more productive countries invest more on R&D or does the higher level of R&D investment that leads to higher levels of productivity? Do both relationships occur at the same time? Using a 65-country panel for the time period of 1960- 2000, this study provides evidence that the relationship is mainly based on investment in R&D and not the reverse. In addition, we found that per capita R&D expenditure is strongly exogenous to productivity. These results suggest that, on average, those countries making the most effort in the R&D sector will be more productive in the future. Finally, we present evidence those points out a strong relationship between R&D and productivity in terms of both magnitude and significance.

Publicidade digital, storytelling e transmedia narrativa: educomunicação do consumidor

The present text tries to analyze the relationships between the concept of digital storytelling applied to advertising starting from the base of the transmedia narrative. This is: how the new transmediatic narrative helps the construction of advertising discourses based on the notion of storytelling and how it establishes the bases for an educommunication of the consumer, the spectator and / or the target.El presente texto trata de analizar las relaciones entre el concepto de storytelling digital aplicado a la publicidad partiendo de la base de la narrativa transmedia. Esto es: cómo la nueva narrativa transmediática ayuda a la construcción de discursos publicitarios basados en la noción de storytelling y cómo ello establece las bases para una educomunicación del consumidor, del espectador y/o del target.O presente texto tenta analisar as relações entre o conceito de narrativa digital aplicado à publicidade a partir da base da narrativa transmedia. Isto é: como a nova narrativa transmediaica ajuda a construção de discursos publicitários com base na noção de narrativa e como estabelece as bases para uma educação do consumidor, o espectador e / ou o target

Key factors for taking a position in discussions of artistic research: conflicts and challenges of a multiple, changing and inquisitive knowledge. Spanish context (1978-2017)

La situació actual de la recerca artística continua plantejant múltiples conflictes i debats que constaten els desfasaments de les últimes dècades entre les estratègies de les polítiques universitàries i la tossuda realitat de la pràctica artística i investigadora. Per reubicar posicions davant aquests conflictes i els reptes actuals, es planteja una relectura situada dels debats sobre investigació artística, en el context espanyol des del 1978, quan els ensenyaments artístics es van incorporar a Espanya al sistema universitari, fins a l'actualitat. Es proposa la visualització d'una línia de temps per situar els vincles entre les polítiques universitàries i alguns debats rellevants, per mitjà d'esdeveniments i publicacions d'aquest període. A partir d'aquestes dades s'assenyalen alguns dels aspectes clau que identifiquen els conflictes més rellevants i recurrents en la investigació artística, sobre qüestions epistemològiques (objecte d'investigació, terminologia i metodologia) i sobre els seus criteris d'avaluació i finançament polèmics (vinculats al reconeixement dels formats i circuits de difusió, temporalitats, filiació a institucions, etc.), així com altres assumptes que s'han considerat secundaris o marginals (com les condicions laborals dels investigadors, la precarietat del sector artístic i de la recerca en humanitats o la privatització i mercantilització del coneixement i la cultura). Per finalitzar, es proposen algunes qüestions que cal considerar per prendre posició davant els reptes actuals, que haurien de considerar la naturalesa múltiple, canviant i qüestionadora del saber artístic.La situación actual de la investigación artística sigue planteando múltiples conflictos y debates que constatan los desfases de las últimas décadas entre las estrategias de las políticas universitarias y la tozuda realidad de la práctica artística e investigadora. Con el fin de reubicar posiciones ante estos conflictos y los retos actuales, se plantea una relectura situada de los debates sobre investigación artística, en el contexto español y desde 1978 (cuando las enseñanzas artísticas se incorporaron al sistema universitario español) hasta la actualidad. Se propone la visualización de una línea de tiempo para situar los vínculos entre las políticas universitarias y algunos debates relevantes, a través de eventos y publicaciones de este periodo. A partir de estos datos, se señalan algunos de los aspectos clave que identifican los conflictos más relevantes y recurrentes en la investigación artística, sobre cuestiones epistemológicas (objeto de investigación, terminología y metodología) y acerca de sus polémicos criterios de evaluación y financiación (vinculados al reconocimiento de los formatos y circuitos de difusión, temporalidades, filiación a instituciones, etc.), así como otros asuntos que se han considerado secundarios o marginales (como las condiciones laborales de los investigadores, la precariedad del sector artístico y de la investigación en humanidades o la privatización y mercantilización del conocimiento y la cultura). Para finalizar se proponen algunas cuestiones a considerar para tomar posición ante los retos actuales, que deberían considerar la naturaleza múltiple, cambiante y cuestionadora del saber artístico.The current situation of artistic research continues to pose multiple conflicts and debates that show the disengagement of the last few decades between the strategies of university policies and the stubborn reality of artistic research practices. In order to relocate positions on these conflicts and the current challenges, there is a re-reading of the debates on the Spanish artistic research since 1978. Back then, the artistic teachings were incorporated into the university system in Spain until today. The proposal was to display a timeline to locate the links between university policies and some relevant debates, through events and publications of this period. These data point to some of the key aspects that identify the most relevant and recurring conflicts in artistic research, epistemological issues (object of research, terminology and methodology) and their controversial assessment and financing criteria (linked to recognition of the formats and circuits of diffusion, temporalities, affiliation to institutions, etc.). Also, other issues that have been considered secondary or marginal (such as the working conditions of researchers, the precariousness of the artistic sector and research in humanities or the privatisation and commercialism of knowledge and culture). Finally, we propose some questions to consider in order to take a position on the current challenges, which should take into account the multiple, changing and questioning nature of artistic knowledge