Distributing Tourists Among POIs with an Adaptive Trip Recommendation System

Traveling is part of many people leisure activities and an increasing fraction of the economy comes from the tourism. Given a destination, the information about the different attractions, or points of interest (POIs), can be found on many sources. Among these attractions, finding the ones that could be of interest for a specific user represents a challenging task. Travel recommendation systems deal with this type of problems. Most of the solution in the literature does not take into account the impact of the suggestions on the level of crowding of POIs. This paper considers the trip planning problem focusing on user balancing among the different POIs. To this aim, we consider the effects of the previous recommendations, as well as estimates based on historical data, while devising a new recommendation. The problem is formulated as a multi-objective optimization problem, and a recommendation engine has been designed and implemented for exploring the solution space in near real-time, through a distributed version of the Simulated Annealing approach. We test our solution using a real dataset of users visiting the POIs of a touristic city, and we show that we are able to provide high quality recommendations, yet maintaining the attractions not overcrowded

Quaternionic Hermitian Spinor Systems and Compatibility Conditions

In this paper we show that the systems introduced in [12] and [22] are equivalent, both giving the notion of quaternionic Hermitian monogenic functions. This makes it possible to prove that the free resolution associated to the system is linear in any dimension, and that the first cohomology module is nontrivial, thus generalizing the results in [22]. Furthermore, exploiting the decomposition of the spinor space into sp(m)-irreducibles, we find a certain number of algebraic compatibility conditions for the system, suggesting that the usual spinor reduction is not applicable

CoPart: a context-based partitioning technique for big data

The MapReduce programming paradigm is frequently used in order to process and analyse a huge amount of data. This paradigm relies on the ability to apply the same operation in parallel on independent chunks of data. The consequence is that the overall performances greatly depend on the way data are partitioned among the various computation nodes. The default partitioning technique, provided by systems like Hadoop or Spark, basically performs a random subdivision of the input records, without considering the nature and correlation between them. Even if such approach can be appropriate in the simplest case where all the input records have to be always analyzed, it becomes a limit for sophisticated analyses, in which correlations between records can be exploited to preliminarily prune unnecessary computations. In this paper we design a context-based multi-dimensional partitioning technique, called COPART, which takes care of data correlation in order to determine how records are subdivided between splits (i.e., units of work assigned to a computation node). More specifically, it considers not only the correlation of data w.r.t. contextual attributes, but also the distribution of each contextual dimension in the dataset. We experimentally compare our approach with existing ones, considering both quality criteria and the query execution times

“Proceso de selección y el desempeño laboral de los docentes de la I.E. Cibert Uni, Ate – 2018”

La presente investigación lleva como título “El proceso de selección y el desempeño laboral de los docentes de la I.E. Cibert Uni, Ate – 2018” tienen como objetivo describir la relación entre el proceso de selección y el desempeño laboral de los docentes de la I.E. Cibert Uni, Ate – 2018. La investigación es de tipo Aplicada, de diseño No experimental, con una población de 30 colaboradores y una muestra de tipo censal por estar conformada por toda la población. Para el estudio de las variables del proceso de selección y el desempeño laboral se utilizó la técnica de la encuesta. La prueba estadística para dar respuesta a las hipótesis planteadas, se realizó mediante el coeficiente de correlación de Spearman los resultados obtenidos indican que existe una relación negativa muy baja entre el proceso de selección y el desempeño laboral, Por otro lado se rechazó la hipótesis alterna y se aceptó la hipótesis nula por tener un nivel de significancia de 0.294. Por lo que se recomienda evaluar periódicamente el análisis de puesto, el reclutamiento y la contratación de nuevos empleados. Es necesario medir el rendimiento del trabajo o las actividades realizadas para aplicar acciones de mejora en caso sean necesarias

Competencias actitudinales y autoevaluación en estudiantes de la carrera de Industrias Alimentarias de una universidad pública de Lima Metropolitana, 2021

La presente investigación se desarrolló con el objetivo de determinar la relación entre las competencias actitudinales y la autoevaluación en estudiantes de la carrera de Industrias Alimentarias de una Universidad pública de Lima Metropolitana. Entre las teorías de estudio se encuentra las formuladas por Piaget y Vygotsky sobre el paradigma constructivista de adecuadas competencias en los procesos de evaluación. El método fue de enfoque cuantitativo, diseño no experimental de corte transversal, tipo básica, y de un nivel correlacional. La población estuvo conformada por 112 estudiantes con una muestra de 87 participantes bajo el criterio de inclusión y exclusión. Los datos se obtuvieron por la técnica de encuesta y el instrumento del cuestionario. La validez se realizó bajo el juicio de expertos y la confiabilidad bajo el coeficiente del Alfa de Cronbach puntuando una confiabilidad aceptable de 0,71 según escala. Los resultados fueron de Spearman Rho = 0.98 a nivel general, Spearman Rho = 0.77 a nivel específico 1, Spearman Rho = 0.93 a nivel específico 2, Spearman Rho = 0.92 a nivel específico 3; teniendo un p valor = 0,00 ≤ α 0,05 en los 4 resultados y demostrando una correlación positiva entre las variables y sus dimensiones

Design Space Investigation by RSMs Techniques in Aeronautical Metal Cutting Applications

none3A. DEL PRETE; A. DE VITIS; D. MAZZOTTADEL PRETE, Antonio; DE VITIS, ANTONIO ALBERTO; D., Mazzott

Viticultura en terrazas del Valle de Cembra en Italia: hacia la inclusión de la gestión sostenible del paisaje en las acciones de desarrollo orientadas a la calidad

Terraces represent the most wide-spread solution for steep hillslope cultivation. The elevated number of positive ecosystem services produced by the derived terraced landscapes when-well maintained are threatened by ongoing land-abandonment and landscape-irrespective agricultural transformation processes. In this manuscript, we analyzed the current state of the terraced area of Val di Cembra (Trentino-Italy). We aimed to analyze the reason behind the high rate of active maintenance of the terraced viticulture, discuss the main risks related to the introduction of intensive land management practices and list possible solutions for ensuring a long-term sustainable development of the area. We identified the wine-quality oriented development of viticulture, the realization of important infrastructure to ensure mobility and irrigation, and the strong sense of belonging still present also among young generations, the main factors determining the high rate of active maintenance of the terraced landscape. Besides the risk of obsolescence that affects the most marginal terraced areas of the valley, other risks are associated with the possible diffusion of landscape-indifferent land-arrangement and to the adoption of not traditional training systems, which may affect negatively the landscape value. Future perspectives need to enlarge the quality-oriented process undertaken in wine production to the whole territory. Including landscape in land management planning will ensure long-lasting sustainability of viticulture, matching the increasing demand for environmental services from the community and the consumers. Ongoing action in the Valley, that involve both private stakeholders and local authorities, are indicating the intention of the community to move in this direction.Las terrazas representan la solución más extendida para el cultivo en pendientes escarpadas. El número elevado de servicios ecosistémicos positivos producidos por paisajes con terrazas cuando están bien mantenidos se ve amenazado por el abandono continuo de la tierra y la transformación agrícola que no tiene en cuenta el paisaje. En este artículo, hemos analizado el estado actual de la zona de terrazas de Val di Cembra (Trentino-Italia). Nuestro objetivo fue analizar las causas detrás de la alta tasa de mantenimiento activo de la viticultura en terrazas, examinar los principales riesgos relacionados con la introducción de la gestión intensiva de la tierra y proponer posibles soluciones para garantizar un desarrollo sostenible a largo plazo de la zona. Hemos identificado los principales factores que determinan la elevada tasa de mantenimiento activo del paisaje en terrazas: el desarrollo de la viticultura orientado a la calidad del vino, la realización de infraestructuras importantes para garantizar la movilidad y el riego, y el fuerte sentido de pertenencia todavía presente también entre las generaciones jóvenes. Además del riesgo de obsolescencia que afecta a las zonas de terrazas más marginales del Valle, otros riesgos están asociados con la posible difusión de la transformación del territorio indiferente al paisaje y a la adopción de sistemas de cultivo que no son tradicionales, que pueden afectar negativamente el valor del paisaje. Las perspectivas futuras deben ampliar el proceso orientado a la calidad en la producción de vino en todo el territorio. La inclusión del paisaje en la planificación del manejo de la tierra garantizará una sostenibilidad duradera de la viticultura, respondiendo a la creciente demanda de servicios medioambientales por parte de la comunidad y de los consumidores. Proyectos en curso en el Valle, en los que participan tanto actores privados como autoridades locales, están indicando la intención de la comunidad de avanzar en esta dirección

Application of a smart dynamic scale for measuring live-fish biomass in aquaculture

— The need of measuring the fish biomass, either for in-land facilities or offshore cages, drove recently to develop a cheap dynamic scale (by MEGA Materials srl), based on a board of the Arduino family, suitable to measure live-fish weights. Via a Bluetooth transmitter and a specific app the communication with smartphones is allowed. The estimation of live-fish biomass is extremely relevant to precisely quantify the daily dose of feed to be supplied and to avoid a reduction of fish growth. We present the comparison between ‘static’ and ‘dynamic’ weight measures of seabream juveniles reared in tanks

Effect of allogeneic intraoperative blood transfusion on survival in patients treated with radical cystectomy for nonmetastatic bladder cancer: Results from a single high-volume institution

Transfusion has been related to poor survival after surgery in several cancers. Recently, timing of transfusion has been proposed as crucial in the determination of poor survival expectanies after surgery, in fact, intra- operative but not postoperative transfusion were found to be related. We confirmed these findings in patients who underwent radical cystectomy because of bladder cancer; physicians should avoid use of transfusion intraoperatively. Background: Previous studies have demonstrated that perioperative blood transfusion (BT) is associated with a significantly increased risk of cancer recurrence and mortality after radical cystectomy (RC). Recently, it was shown for the first time that intraoperative transfusion has a detrimental effect on cancer survival. The aim of the current study was to validate this finding in a single European institution. Patients and Methods: The study focused on 1490 consecutive nonmetastatic bladder cancer patients treated with RC at a single tertiary care referral center between January 1990 and August 2013. KaplaneMeier analyses and Cox regression analyses were used to assess the effect of timing of BT administration (no transfusion vs. intraoperative transfusion vs. postoperative transfusion vs. intra- operative and postoperative transfusion) on cancer-specific mortality (CSM), overall mortality (OM), and disease recurrence. Results: Mean age at the time of RC was 67 years. Overall, 322 (21.6%) patients received intraoperative BT and 97 (6.5%) received postoperative BT. At a mean follow-up time of 125 months (median, 110 months), the 5- and 10-year CSM rate was 846 (58%) and 715 (48%), respectively. In multivariable analyses patients who received intraoperative BT had greater risk of disease recurrence (hazard ratio [HR], 1.24; P .2). Conclusion: Our study confirms that intraoperative, but not postoperative BT, are related to a detrimental effect on survival after RC. These results should be take into account by physicians to administer BT using the correct timing