Evaluation of the impact of mobility models on handover in WLAN indoor environments

Nowadays, mobility models are used to simulate realistic movements produced by the users of a wireless or a mobile network. The aim of this project is to evaluate the impact of mobility models on handover process in Wireless Local Area Networks (WLAN) indoor environments, using the network simulator NS-2. This document contains a previous theoretical characterization of the basic mobility models and their application in the network simulator NS-2, a study of the infrastructure mode support and a modification of the current handover algorithm. The study focuses on two mobility models in WLAN indoor environments: one where movements are completely random (i.e. Random Waypoint) and another one where next step depends on previous movements (i.e. Gauss-Markov). In order to support infrastructure mode operation in WLAN, a new patch with modifications of the source code is applied. Furthermore, a first approach for the development of a new handover algorithm is presented. Simulations are run in two different scenarios: one with 4 Access Points (APs) offering full coverage in the simulated area, and another one with 8 APs, simulating overcoverage in order to guarantee higher capacity for a higher density of users. Results are presented showing a comparative of the cell residence time (CRT) for each scenario. From the results obtained, it is possible to see that the CRT changes depending on the algorithm and the mobility model applied, being lower when the Random Waypoint model is applied. On the other hand, the new handover algorithm designed from the current implementation leads to a decrease in the average CRT

Three decades of research on wine marketing

The goal of this study is to provide a comprehensive review of the academic research into wine marketing over the last three decades. Data from 1,135 wine marketing-related research documents published 1990-2022 in the Web of Science and Scopus databases were employed. Using mainly co-word analysis and bibliographic coupling, the key themes of the discipline were identified. A longitudinal analysis identified the topic’s evolution and current research trends. Results show that wine marketing research has grown sharply in recent years. From the pioneering studies that examined consumers’ behaviours and wine price drivers, the discipline evolved to address burgeoning themes such as sustainability, social media (digital marketing) and wine tourism, which evidences the interest that academics have shown in enhancing knowledge in the area

Evaluation of the impact of mobility models on handover in WLAN indoor environments

Nowadays, mobility models are used to simulate realistic movements produced by the users of a wireless or a mobile network. The aim of this project is to evaluate the impact of mobility models on handover process in Wireless Local Area Networks (WLAN) indoor environments, using the network simulator NS-2. This document contains a previous theoretical characterization of the basic mobility models and their application in the network simulator NS-2, a study of the infrastructure mode support and a modification of the current handover algorithm. The study focuses on two mobility models in WLAN indoor environments: one where movements are completely random (i.e. Random Waypoint) and another one where next step depends on previous movements (i.e. Gauss-Markov). In order to support infrastructure mode operation in WLAN, a new patch with modifications of the source code is applied. Furthermore, a first approach for the development of a new handover algorithm is presented. Simulations are run in two different scenarios: one with 4 Access Points (APs) offering full coverage in the simulated area, and another one with 8 APs, simulating overcoverage in order to guarantee higher capacity for a higher density of users. Results are presented showing a comparative of the cell residence time (CRT) for each scenario. From the results obtained, it is possible to see that the CRT changes depending on the algorithm and the mobility model applied, being lower when the Random Waypoint model is applied. On the other hand, the new handover algorithm designed from the current implementation leads to a decrease in the average CRT

Publicidad generada por el consumidor patrocinada: un análisis del fenómeno, el consumidor creativo y las respuestas de la audiencia

Esta tesis doctoral centra su atención en el fenómeno de la publicidad generada por el consumidor (PGC) patrocinada, definida como el contenido online creado por consumidores o usuarios, relacionado con una marca, producto, organización o causa, que tiene una finalidad promocional, persuasiva o de concienciación y que ha sido creado como respuesta a la solicitud de una organización que ofrece en alguna medida un incentivo por ello. En este sentido, el objetivo general de este trabajo doctoral es indagar en el fenómeno de la PGC patrocinada, tanto en el ámbito comercial como en el no lucrativo, a través de tres vertientes: (1) profundizando en su práctica profesional, (2) analizando al consumidor creativo que genera anuncios en respuesta a estas campañas, y (3) determinando las respuestas de la audiencia hacia este tipo de anuncios. La tesis doctoral plantea 13 preguntas de investigación y 15 hipótesis, a las cuales se atiende a través de 5 estudios. El estudio 1 se ocupa de la primera vertiente de investigación, es decir, el análisis del fenómeno de la PGC patrocinada como herramienta de promoción en las organizaciones. Para ello, se realiza un análisis de contenido de 162 campañas de PGC patrocinada. La segunda vertiente de investigación, es decir, el consumidor creativo, es tratada a través de los estudios 2 y 3. Por una parte, el estudio 2, mediante la realización de 42 entrevistas semi-estructuradas y la observación netnográfica, desvela las principales motivaciones por las cuales los consumidores generan publicidad en respuesta a campañas de PGC patrocinada. Por otra parte, el estudio 3 realiza un análisis de contenido mediante el cual dos codificadores puntúan 1.274 anuncios de PGC patrocinada. Este estudio permite conocer qué tipo de estrategias creativas emplean los consumidores que generan publicidad patrocinada y qué duración suelen tener estos anuncios. Los estudios 4 y 5 se centran en el análisis de la tercera vertiente de investigación: las respuestas de la audiencia. En particular, el estudio 4 realiza, a través de aplicaciones de minería textual, el análisis temático, semántico y de sentimiento de 6.279 comentarios publicados en respuesta a anuncios de PGC patrocinada. Por último, el estudio 5, a partir de los datos recogidos sobre una muestra de 336 estudiantes universitarios, analiza desde una perspectiva narrativa el mecanismo a través del cual este tipo de publicidad persuade y genera respuestas en la audiencia, empleando para ello modelos de ecuaciones estructurales. Al investigar estas tres áreas mediante los cinco estudios conducidos, se considera no sólo el fenómeno de la PGC patrocinada desde una perspectiva comercial, sino también desde el punto de vista de las organizaciones no lucrativas. De este modo, los hallazgos obtenidos generan conocimiento en este ámbito de la investigación publicitaria y ofrecen una visión práctica sobre este fenómeno, cuya aplicabilidad se extiende a un amplio espectro de organizaciones. En particular, las conclusiones e implicaciones alcanzadas no sólo reflejan el uso que organizaciones de todo tipo hacen de las estrategias de PGC patrocinada como herramienta de promoción, sino que también proporcionan un enfoque motivacional sobre el rol del consumidor como creativo publicitario. Además, los resultados sobre los efectos que los anuncios de PGC patrocinada provocan en la audiencia son abordados desde diferentes perspectivas

La gestión turística de las villas vénetas. Un modelo de referencia para la promoción de las villas de Cartagena como producto turístico

La villa constituye una tipología arquitectónica que ha legado excelentes edificios a lo largo de la historia. Buena muestra de ello es el numeroso conjunto de villas existente en la región italiana del Véneto construidas entre los siglos XV y XVIII. También en otros lugares se han vivido momentos de auge en la construcción de villas, por ejemplo en Cartagena, situada en el sureste de España, donde destacan una serie de residencias de recreo, ubicadas en pleno campo y construidas con cierta singularidad arquitectónica, pertenecientes a la etapa final siglo XIX y principios del siglo XX. Lamentablemente, frente al reconocido valor de las villas vénetas, las villas de Cartagena se encuentran en un grave estado de abandono que hace necesaria la adopción de medidas para su recuperación y puesta en valor. Se plantea por tanto esta investigación con el objetivo de extraer de la experiencia italiana en la gestión turística de las villas vénetas el principal enfoque responsable de su éxito, tomando de este modo estrategias útiles encaminadas a la promoción de las villas del campo de Cartagena como producto turístico

Bumblebees: a multiagent combinatorial optimization algorithm inspired by social insect behaviour

This paper introduces a multiagent optimization algorithm inspired by the collective behavior of social insects. In our method, each agent encodes a possible solution of the problem to solve, and evolves in a way similar to real life insects. We test the algorithm on a classical difficult problem, the $k$-coloring of a graph, and we compare its performance in relation to a standard genetic algorithm and another multiagent system. The results show that this algorithm is faster and outperforms the other methods for a range of random graphs with different orders and densities. Moreover, the method is easy to adapt to solve different NP-complete problems

Evaluación de tres variedades de Frijol en dos comunidades del TeSAC de Olopa, Chiquimula; con implementación de prácticas ASAC en base al modelo de Servicios Integrados Participativos de Clima para la Agricultura (PICSA)

En el marco de los proyectos Soluciones Digitales Integradas Agroclimáticas (Agroclimas Fase 2) y Territorios Sostenibles Adaptados al Clima (TeSAC) ambos parte del programa de investigación del CGIAR sobre Cambio Climático, Agricultura y Seguridad Alimentaria (CCAFS), se busca generar evidencia de la implementación de servicios climáticos participativos. Específicamente en el TeSAC de Olopa1, CCAFS-CIAT con el apoyo de los socios estratégicos, en particular la Asociación Regional Campesina Ch'orti' (ASORECH), y en asocio con el Centro Universitario de Oriente (CUNORI) de la Universidad de San Carlos de Guatemala (USAC), se adelantan procesos de capacitación relacionados manejo agronómico, información climática y la toma de decisiones basadas en condiciones de tiempo y clima. En este contexto CCAFS-CIAT está realizando intervenciones en sistemas de producción de fríjol del TeSAC de Olopa orientadas a mejorar la toma de decisiones con respecto a la variabilidad climática histórica y pronosticada. Se están llevando a cabo experimentos en pequeñas fincas sobre manejos de fechas de siembra u otras prácticas que den evidencia sobre el desempeño de las decisiones basadas en pronósticos estacionales. El presente reporte muestra los avances de ensayos de frijol en el departamento de Olopa, en los que se evaluarán prácticas de manejo y rendimiento, que den indicios de mejoras en las comunidades que han implementado metodologías de métodos participativos de servicios climáticos.Within the framework of the Integrated Agro-climatic Digitally Integrated Solutions (Agroclimas Phase 2) and Cliamte-Smart Villages (CSV) projects, both parts of the CGIAR Research Program on Climate Change, Agriculture and Food Security (CCAFS), are seeking to generate evidence of the implementation of participatory climate services. Specifically in theOlopa CSV, CCAFS-CIAT with the support of the strategic partners, in particular the Asociación Regional Campesina Ch'orti' (ASORECH), and in association with the Centro Universitario de Oriente (CUNORI) of the University of San Carlos of Guatemala (USAC), training processes related to agronomic management, climate information and decision-making based on weather and climate conditions are advanced. In this context, CCAFS-CIAT is carrying out interventions in bean production systems of Olopa CSV aimed at improving decision-making regarding historical and predicted climatic variability. Experiments in small farms on sowing dates or other practices that give evidence on the performance of decisions based on seasonal movements are affected. This report shows the progress of bean trials in the department of Olopa, in which they evaluate management and performance practices, which give indications of improvements in communities that, have implemented methodologies of participatory methods of climate services

Niveles de actividad física medido con acelerómetro en alumnos de 3º ciclo de Educació Primaria : actividad física diaria y sesiones de Educación Física

Physical inactivity during the early years of life is currently indicated as a major contributor to increased levels of obesity and other serious medical conditions and is being seen in children and adolescents all across europe. children spend a large part of their time at school. The new school curriculum provides good opportunities to promote physical activity. The present study aims to measure children's all day physical activity objectively and identify the amount of physical activity that takes place during physical education classes. the study comprised a sample of 32 spanish children ages 11-12 from a school in toledo, spain. an accelerometer was used to measure physical activity. most of the children did not achieve the physical activity health guidelines (i.e., a minimum of 60 minutes of moderate to vigorous physical activity (mvpa). physical education classes provided a considerable amount of mvpa and played an important role in relation to the total amount of mvpa that took place during the week

Screening and Evaluation of Essential Oils from Mediterranean Aromatic Plants against the Mushroom Cobweb Disease, Cladobotryum mycophilum

The main aim of this study was to evaluate the use of essential oils (EOs) as an alternative to synthetic fungicides used in the control of cobweb disease of button mushroom (Agaricus bisporus) caused by Cladobotryum mycophilum. The EOs used were obtained by hydrodistillation from five Mediterranean aromatic species (Lavandula × intermedia, Salvia lavandulifolia, Satureja montana, Thymus mastichina, and Thymus vulgaris), analyzed by gas chromatography, and tested in vitro for their antifungal activity against C. mycophilum. In vitro bioassays showed that the EOs obtained from T. vulgaris and S. montana (ED50 = 35.5 and 42.8 mg L−1, respectively) were the most effective EOs for inhibiting the mycelial growth of C. mycophilum, and were also the most selective EOs between C. mycophilum and A. bisporus. The in vivo efficacy of T. vulgaris and S. montana EOs at two different concentrations (0.5 and 1%) were evaluated in two mushroom growing trials with C. mycophilum inoculation. The treatments involving T. vulgaris and S. montana EOs at the higher dose (1% concentration) were as effective as fungicide treatment. The effect of these EOs on mushroom productivity was tested in a mushroom cropping trial without inoculation. They had a strong fungitoxic effect at the first flush. However, a compensatory effect was observed by the end of the crop cycle and no differences were observed in biological efficiency between treatments. The main compounds found were carvacrol and p-cymene for S. montana, and p-cymene and thymol for T. vulgaris. These results suggest that T. vulgaris and S. montana EOs may be useful products to manage cobweb disease if used as part of an integrated pest management (IPM) program

Impacts and Implications for Advancing in Environmental Knowledge in Hospitality Industry in COVID Society:a Bibliometric Analysis

Environmental knowledge is attracting interest in the area of sustainability due to the importance of both the environment and knowledge. As tourism is one of the biggest employers and sectors of economic development, environmental knowledge in hospitality represents a worldwide challenge. The present study aims to provide a clear understanding of the impacts and implications of environmental knowledge in the hospitality industry in a COVID society, taking into account its general areas of evolution through a systematic review methodology using a bibliographic database over time (26 years). We reviewed 944 documents collected from the Web of Science (WoS) Core Collection database and analysed them using the Science Mapping Analysis Software Tool (SciMAT). In a world in which the environment is more deteriorated, it is important to be aware of the advance in environmental knowledge to take care of it and eliminate environmental degradation. This study adds value to the orchestration of knowledge by focusing on predictors that impact environmental knowledge. The results identify the development status and leading trends in environmental knowledge research to fall in love with the future in a COVID society. Falling in love with the future is possible in the hospitality industry