Internet of Things and Their Coming Perspectives: A Real Options Approach

Internet of things is developing at a dizzying rate, and companies are forced to implement it in order to maintain their operational efficiency. The high flexibility inherent to these technologies makes it necessary to apply an appropriate measure, which properly assesses risks and rewards. Real options methodology is available as a tool which fits the conditions, both economic and strategic, under which investment in internet of things technologies is developed. The contribution of this paper is twofold. On the one hand, it offers an adequate tool to assess the strategic value of investment in internet of things technologies. On the other hand, it tries to raise awareness among managers of internet of things technologies because of their potential to contribute to economic and social progress. The results of the research described in this paper highlight the importance of taking action as quickly as possible if companies want to obtain the best possible performance. In order to enhance the understanding of internet of things technologies investment, this paper provides a methodology to assess the implementation of internet of things technologies by using the real options approach; in particular, the option to expand has been proposed for use in the decision-making process

Implications of climate change for rice farming in the Doñana wetland (SW Spain)

Climate change impacts are expected to affect rice farming and wetlands welfare in the Doñana protected Area, due to decreases in quantity and quality water supply and higher temperatures. The largest rice farming area is closely located to the Doñana wetlands in the Guadalquivir river basin estuary (South Western of Spain)

The Influence of Quality on eWOM: A Digital Transformation in Hotel Management

612324There is no doubt that the use of Internet for purchasing products and services has constituted a crucial change in how people go about buying them. In the era of digital transformation, the possibility of accessing information provided by other users about their personal experiences has taken on more weight in the selection and buying processes. On these lines, traditional word-of-mouth (WOM) has given way to electronic word-of-mouth (eWOM), which constitutes a major social change. This behavior is particularly relevant in the services area, where potential users cannot in advance assess what is on offer. There is an abundant literature analyzing the effects of eWOM on different variables of interest in this sector. However, little is known about the factors that determine eWOM. Thus, the main objective of the present paper is to analyze the impact of two variables (objective quality and perceived quality) on eWOM. Both of them are crucial for potential customers in the process of finding hotel accommodations and they can motivate people to make such comments. The results demonstrate that these variables truly have a significant impact on whether or not users make comments on line. Moreover, it proved possible to observe certain differences according to the profile of the tourist involved and the destination where the hotel is located. In the current changing environment, this information is of great use for hotel managers in order to design strategies according to the type of guest they wish to attract.S

Análisis del error sistemático en la sustracción

En este artículo presentamos resultados de investigación relacionados con la tipología, naturaleza y evolución de los errores en la sustracción. El objetivo principal de la investigación trata de indagar sobre si en nuestro contexto escolar se producen errores sistemáticos y si disminuyen a lo largo de la escolaridad. Asimismo, comparamos los resultados obtenidos con los aportados por autores de referencia en este campo de investigación. Para ello, efectuamos un análisis sobre 7.140 restas realizadas por niños/as escolarizados en 2º, 3º, 4º, 5º y 6º de Educación Primaria. Los resultados demuestran la existencia de errores sistemáticos y tipología concreta de los mismos, hecho de indudable valor a la hora de programar didácticamente el proceso de enseñanza.In this article, we presented results related to the typology, nature and evolution of the errors in subtraction. The main aim, is to examine if in our school context systematic errors take place and if these decrease throughout schooling. Also, we compared our results with the ones contributed by authors of reference in this field of research. To do so, we carried out an analysis on 7140 subtractions made by children in our educational system. The results demonstrate the existence of systematic errors in our scholastic context, a fact of doubtless value when programming the learning process didactically

Visualisation of Perception of Experiential Activities in Business and Administration and Economy

This paper explores how to incorporate information visualization tools into qualitative studies to represent the underlying structure of knowledge. Information visualization plays a key role in many areas such as decision-making, data mining, market studies, or knowledge management. A case of experiential learning was developed for Quantitative Techniques in Business and Administration and Economy Degrees at the University of Granada, Spain. The goal is to analyze the opinion of students (n = 227) on the development of the activity through information visualization techniques. The gathered information was subjected to a categorization process to unify and homogenize the responses. After a term-clumping process, a co-word analysis using the VosViewer software is used to analyze the relationships among terms and provide the network maps. Results display the main associations and clusters of terms used when assessing the experiential activity, using qualitative techniques. In conclusion, the strengths of data visualization enabling a better understanding of data for qualitative studies are established

Constrained power allocation schemes for coordinated base station transmission using block diagonalization

In this study, we propose several power allocation schemes in a coordinated base station downlink transmission with per antenna and per base station power constraints. Block Diagonalization is employed to remove interference among users. For each set of power constraints, two schemes based on the waterfilling distribution are proposed and compared to the optimal solution, which can only be obtained numerically by using convex optimization. We show that the proposed schemes achieve a performance, in terms of weighted sum rate, very close to the optimal, without the heavy computational complexity required by the latter. The sum rates are compared first in a simplified two-user two-cell case where we also compare our approach to the previous solutions available in the literature. Then, we examine the performance in a multi-cell scenario where we also evaluate the degradation of the performance caused by imperfect channel state informationThis study has been partly funded by projects TEC2008-06327-C03-02, CCG10-UC3M/TIC-4620, and CSD2008-00010.Publicad

Variabilidad de la frecuencia de pulso mediante análisis no lineal en pacientes con síndrome de apnea del sueño y enfermedad pulmonar obstructiva crónica (EPOC)

El análisis no lineal mediante entropía muestral ha aportado un mayor conocimiento sobre las diferencias en los registros nocturnos de PRV entre los pacientes de EPOC sin y con SAHS (síndrome overlap). Las medidas espectrales en las bandas de frecuencia tradicionales LF y HF no permiten capturar estos cambios en la dinámica nocturna del PRV asociados a los eventos de apnea durante el sueño en pacientes con EPOC. Por el contrario, los pacientes con EPOC y SAHS simultáneamente muestran un incremento significativo de SampEn que los pacientes con solo EPOC o SAHS de forma aislada. Estos hallazgos sugieren que existe un efecto acumulativo de la EPOC y el SAHS hacia una mayor disfunción cardiovascular durante el sueño. De acuerdo con los resultados obtenidos, podemos concluir que SampEn es capaz de cuantificar apropiadamente los cambios en la dinámica nocturna de la señal de PRV en pacientes con síndrome overlap, lo que podría resultar útil para evaluar una potencial afectación cardiovascular en los pacientes con EPOC y presencia de SAHS concomitante.Departamento de Medicina, Dermatología y ToxicologíaDoctorado en Investigación en Ciencias de la Salu