6135 research outputs found

    Solving the dynamic traveling salesman problem using a genetic algorithm with trajectory prediction: an application to fish aggregating devices

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    The paper addresses the synergies from combining a heuristic method with a predictive technique to solve the Dynamic Traveling Salesman Problem (DTSP). Particularly, we build a genetic algorithm that feeds on Newton's motion equation to show how route optimization can be improved when targets are constantly moving. Our empirical evidence stems from the recovery of fish aggregating devices (FADs) by tuna vessels. Based on historical real data provided by GPS buoys attached to the FADs, we first estimate their trajectories to feed a genetic algorithm that searches for the best route considering their future locations. Our solution, which we name Genetic Algorithm based on Trajectory Prediction (GATP), shows that the distance traveled is significantly shorter than implementing other commonly used methods.European Regional Development Fund | Ref. 10SEC300036PRMinisterio de Economía y Competitividad | Ref. ECO2013-45706

    Deciphering the degree of proton-transfer in pyrido-cyclophanes by chiroptical outcomes in non-aqueous solvents

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    Proton transfer equilibria are of pivotal importance due to the role they play in a plethora of biological and phamaceutical processes. With the aim of explaining the relative position of the hydrogen to be transferred, we investigated the behavior of chiral pyrido-cyclophanes with different morphologies using circular dichroism in the presence of different acids in acetonitrile. The results showed that all three compounds underwent double protonation and formation of cascade ion-pairs, leading to the appearance of diagnostic signals in their ECD spectra. The presence of water fosters the crystallization of several intermediates that do not correspond to those in solution. By using Brønsted correlations, it was found that proton transfer from the acid to the pyridine occurred regardless of the acid's p K a .Agencia Estatal de Investigación | Ref. PID2021-128057NB-I00Xunta de Galicia | Ref. EC431C 2021/4

    Spanish maritime security governance in the Indian Ocean region

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    International maritime security issues are high on the agenda of many states and international organisations. Assaults in international waters on vessels flying the Spanish flag raised the awareness of piracy and other illicit acts at sea. Spain applies a twofold strategy in order to fight against piracy off the Somali coast and in the Indian Ocean: it takes part in the first maritime operation of the European Union (EU), EU NAVFOR Atalanta, and facilitates the deployment of private security companies (PSCs) on board civilian vessels sailing in international waters. Based on the security governance concept, this paper examines and compares the strategies regarding actors, the decision-making processes, legal issues and effectiveness. The article argues that the main reason for the change in security policy is that the actors involved assume a security governance approach to be more effective in solving a specific security problem

    Paratraducción: 16 años después. Bibliografía de los impactos científicos de la noción de paratraducción

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    Para terminar el primero de una serie de volúmenes que, bajo el epígrafe de Traducción & Paratraducción (T&P), serán publicados en la colección Studien zur romanischen Sprachwissenschaft und interkulturellen Kommunikation («Estudios sobre lenguas románicas y comunicación intercultural») de la editorial Peter Lang, ofrecemos, en este decimoquinto y último capítulo del libro, las fichas bibliográficas completas de la recopilación que hemos llevado a cabo a lo largo de los últimos años. El lector de esta publicación encontrará, por riguroso orden alfabético y en orden descendente, las 288 publicaciones científicas en las que se ha citado la noción de paratraducción y que constituyen otros tantos impactos del nuevo término traductológico de la Escuela Doctoral de Vigo el cual ha llegado a ser traducido a las siguientes 17 lenguas: español, gallego, catalán, portugués, italiano, francés, inglés, alemán, chino, lituano, polaco, ruso, griego, turco, rumano, persa y árab

    How much does Lean Manufacturing need environmental and information technologies?

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    This paper analyses the role played by Environmental and Information Technologies (ET&IT) in the capability of Lean Manufacturing (LM) to achieve improved industrial performance. In contrast to seminal literature about lean practices, and in view of increasing consumer requirements regarding response times and environmental concerns, we suggest that shop-floor technologies are crucial for transforming lean routines into enhanced performance. Hypotheses were tested in a multisectoral sample of 763 manufacturing plants (NACE codes 15–37) from five different European countries. Results confirm total mediation by both technologies between lean routines and industrial performance, which entails that LM establishes efficient conditions on the shop floor for developing technology-enabled capabilities that can be leveraged to improve industrial performance. From a managerial perspective our findings highlight the need for avoiding short-sighted attitudes and for internalising plant technologies within lean transformation projects. This is important not only because such technologies are determinant for maximising the potential of organisational routines in current manufacturing systems but also because of their intrinsic benefits.Ministerio de Economía y Competitividad | Ref. ECO2016-76625-

    Historias do inframundo: o subsolo no imaxinario colectivo

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    Dentro da noción de paisaxe cultural, neste traballo partimos da paisaxe percibida, e dos relatos e das narrativas que as sociedades crean sobre o territorio. No ámbito do noroeste peninsular, o mundo mitolóxico establece unha relación específica entre as paisaxes aéreas e o mundo subterráneo, na que están presentes as covas, os penedos, a auga e a mourindade. As características deste mundo «baixo a terra» ou inframundo, e da influencia da súa estrutura simbólica na interpretación dos elementos que están «na superficie», resultan escasamente tratadas. Aínda que algunhas cavidades foron estudadas dende ámbitos como a xeoloxía, a espeleoloxía, ou a arqueoloxía, resulta necesaria a aplicación dun enfoque antropolóxico ao estudo destas construcións simbólicas. Propoñemos integrar os distintos ámbitos de coñecemento, tanto para a súa investigación, como para a súa difusión e socialización.Within the cultural landscape concept framework, our research explores the perceptible landscape alongside the narratives and tales woven by societies concerning their land. Centred explicitly in the northwest of the Iberian Peninsula, the mythological realm establishes a unique relationship between aerial landscapes and the subterranean world, in which caves, water reservoirs, and the «mouros» world are present. However, the attributes characterising this underground world — referred to as the underworld — along with the influence of its symbolic structure on the interpretation of surface-level elements have received limited attention. Although specific caves have undergone scrutiny from the perspectives of geology, speleology, and archaeology, there remains an urgent requirement to employ an anthropological approach to comprehending these symbolic constructs

    Engineering learning objectives and computer assisted tools

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    The different technology fields have increased in complexity, especially during the last two decades, giving place to the concept of Complex Technology. An example is Electronics also characterised as a horizontal technology being incorporated in many products and processes of other technological areas. Bloom’s taxonomy of learning objectives and the revised version of Bloom disciples, which have been used by several experts in pedagogy, suffers from a generalist character and are not adapted to technology learning. In this article an engineering learning taxonomy is presented. Also a computer learning assisted tool called ISETL (Integrated System for Electronics Technology Learning) has been developed to facilitate the Electronics fundamentals understanding. ISETL has been evaluated taking into account not only the results of the theoretical assessments but also through the results obtained in the laboratory. These results demonstrate the advantages of this approach and can be depicted by the progressive improvements registered in student performance

    Mid-term policy considerations of the EU green deal

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    The European Green Deal is a comprehensive strategy aiming to fully decarbonize the economy by 2050, with a key target of a 55 % reduction in carbon emissions by 2030. This study contributes to the debate around the European Green Deal by providing insights from different dynamic stochastic general equilibrium models for the six largest European countries and the Union itself. We discuss four policy targets consistent with a 55 % emissions cut by 2030, using carbon prices as the main policy tool. The study reveals that defining fair climate targets for a group of relatively heterogeneous countries like the European ones is challenging. Simple approaches, such as achieving the same CO2 emissions per capita in 2030 or the same emissions over GDP, lead to vastly different policy efforts measured by carbon prices and welfare losses in our model. Implementing a common set of climate policies and tools defined by the European Commission may seem fair, but it results in varying impacts on emissions across countries. The same carbon price has an asymmetric effect on emissions and welfare. Alternatively, achieving the same emission reduction requires different carbon prices for different countries. For example, Spain needs a carbon price of 151 €/tCO2, while Poland only needs 71 €/tCO2 to achieve the target. This asymmetry sparks a debate on determining the right climate target for each country. The article aims to open this discussion rather than provide a definitive answer.Agencia Estatal de Investigación | Ref. PID2021-124015NB-I00Agencia Estatal de Investigación | Ref. PID2022-138706NB-I00Agencia Estatal de Investigación | Ref. TED2021-129891B–I0

    Patentes farmacéuticas en época de pandemia: ¿necesidad de nuevas soluciones jurídicas para emergencias de salud pública?

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    Introducción: Estos tiempos de pandemia ocasionados por el COVID-19 han puesto al límite muchas situaciones y medios en una gran variedad de contextos y escenarios de diverso tipo (humanos, económicos, jurídicos, etc.). El Derecho también se ha visto involucrado y afectado, teniendo que responder y dar soluciones a estados excepcionales. Sin duda se trataba de una emergencia sanitaria de alta magnitud con alcance mundial y global. El preciado bien de la salud pública estaba amenazado por un virus desconocido al que había que hacer frente, sobre todo, con soluciones de carácter médico, en particular medicamentos y aparatos que paliaran los dañinos efectos que se producían en la salud de las personas. (...

    Exercise for nonagenarians: a systematic review

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    Background: Physical exercise has been identified as a health promotion strategy for the oldest old. However, scientific evidence regarding the benefits of exercise on nonagenarians is scarce. This systematic review aimed to evaluate the characteristics and methodological quality of investigations that have examined the effects of physical exercise on nonagenarians. Methods: A systematic review and evidence synthesis were conducted. The MEDLINE/PubMed, CINAHL, Scopus, SPORTDiscus, and Cochrane Library were systematically searched up to November 2018. Investigations were included if they tested the effects of an exercise intervention on people 90 years or older. The methodological quality of the randomized controlled trials was evaluated using the PEDro scale. Quality appraisal tools developed by the National Heart, Lung and Blood Institute were used to evaluate the uncontrolled and Three randomized controlled trials, 1 retrospective study, 2 case reports, and 1 single-subject A-B design met the eligibility criteria. The methodological quality scores obtained from the scales ranged from poor to good. Most interventions were based on muscular strengthening, balance exercises, or a combination of both. No adverse effects were registered. In general, exercise showed a significant impact on muscular strength, while mixed effects were found regarding gait and balance. Pooled analyses indicated that interventions had significant improvements in global lower body functioning (standardized mean difference, SMD = 0.47; 95% confidence interval = 0.04, 0.90; P < .01). Conclusions: Exercise is a feasible therapy for nonagenarians, which can lead to improvements in physical functioning. Future research should focus on the effects of aerobic interventions, as well as the impact that exercise has on the cognitive functioning of nonagenarians


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