Poli[Papers] (Universitat Politècnica de València)
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Review of state-of-the-art and conceptual framework approaches in seaside port operations: berth allocation, and quay crane assignment and scheduling
Get PDFThe continuous growth in the volume of goods transported by sea has led to a significant increase in the number of vessels and containers arriving at ports, requiring more efficient management of vessel loading and unloading operations. These operations involve three key problems: berth allocation, quay crane assignment, and quay crane scheduling. In response to these challenges, numerous mathematical programming models have been proposed, and various literature reviews analysing these models have emerged in recent years. However, the abundance of such reviews highlights the need for a systematic organisation of available information to consolidate the state of the art in this field. To this end, this paper conducts a systematic literature review, following PRISMA guidelines, based on publications retrieved from Scopus and Web of Science. This study focuses specifically on existing state-of-the-art studies that analyse mathematical models for berth allocation, quay crane assignment, and/or quay crane scheduling. The objectives of this work are threefold: (i) to assess the scope of previous literature reviews, including their purpose, the problems addressed, and their temporal coverage; (ii) to identify and group the dimensions they use to categorize the problems and the models designed to address them; and (iii) to compile the future research directions proposed in these reviews and highlight those that remain relevant. The findings provide a comprehensive overview of trends, highlight research gaps, and propose dimensional groups to consider when developing more holistic decision support frameworks for port operations
Integration of artificial intelligence in reverse logistics process: enhancing decision-making across planning, execution, and control stages
Get PDFThis study explores the integration of Artificial Intelligence (AI) into the Reverse Logistics Process (RLP) to enhance decision-making, operational efficiency, and resource recovery. Through a systematic literature review, the applications of AI across critical RLP stages (planning, execution and control) are identified. Key findings highlight the transformative role of AI in optimizing network design, improving product collection and inspection, and supporting decision-making for the disposition of recovered items. AI technologies and functionalities such as machine learning, predictive analytics, and decision-support systems demonstrate significant potential for automating complex processes, reducing operational costs, and improving logistical precision. However, barriers to AI adoption in the RLP include high implementation costs, organisational resistance, lack of specialist personnel, and limited technological infrastructure. The review also identifies enablers such as advancements in the Internet of Things, blockchain, and big data analytics, which facilitate AI adoption and integration in RLP. The study concludes that AI is essential for establishing resilient and adaptive RL systems and offers substantial opportunities to address uncertainty while improving efficiency and decision-making. Future research should focus on overcoming adoption barriers, advancing predictive models, and integrating AI with other Industry 4.0 technologies to enhance RLP outcomes. This review fills a significant gap in the literature by offering a structured analytical framework that categorises AI applications based on decision types and RLP stages, providing an integrated perspective not previously addressed in the field
Notions of mixing and sensitivities for triangular map and its non-autonomous components
Get PDFIn this paper, we relate the dynamics of the triangular map to the dynamics of its individual components. We prove that if the non-autonomous system generated by a transitive point (for the base map) is topological mixing then the triangular map is transitive. We prove that if the base map is minimal and the generating family of non-autonomous systems is commutative then weak mixing of the non-autonomous system (generated by a transitive point) ensures transitivity of the triangular system. We also derive sufficient conditions for triangular map to exhibit stronger notions of mixing and provide examples to establish the necessity of the conditions imposed. We prove that a triangular system is equicontinuous if and only if each of the component systems are equicontinuous and the non-autonomous components { ( Y , Dx ) : x ∈ X } are synchronized. We prove that if the family of non-autonomous systems is synchronized then if non-autonomous system generated by a transitive point exhibits any form of mixing then non-autonomous system generated by any point exhibits the same. We also relate various forms of sensitivities for triangular map to analogous notions for the component systems
Almost strongly star-Menger and related properties
Get PDFIn this paper we introduce the almost strongly star-Menger property and we provide some results and relationships with another known properties in literature. Furthermore, we characterize the almost strongly star-Menger and the almost star-Menger properties in hyperspaces endowed with the hit-and-miss topology , by using two new selection principles and , for an appropriate family
Some results on the intermediate rings of complex-valued continuous functions
Get PDFLet X be a Tychonoff space and C(X), C ( X , ℂ ) be the rings of all real-valued and complex-valued continuous functions defined on X respectively. For each intermediate subring A(X) of C(X), Acharyya and De have introduced the notion of zβA -ideals in A(X) and zβA-filters on β X. For each A(X), we extend this notion to zβ[A(X)]c -ideals and zβ[A(X)]c-filters for an intermediate subring [A(X)]c of C ( X , ℂ ). We establish a correspondence between the collection of zβ[A(X)]c-ideals in the subrings [A(X)]c of C ( X , ℂ ) and the collection of zβ[A(X)]c-filters on β X. We study the properties of the zβ[A(X)]c-ideals. We also deduce that the structure space of the subrings [A(X)]c is homeomorphic to β X.
Remarks on fixed point assertions in digital topology, 10
Get PDFThe topic of fixed points in digital metric spaces continues to draw publications with assertions that are incorrect, incorrectly proven, trivial, or incoherently stated. We continue the work of our earlier papers that discuss publications with bad assertions concerning fixed points of selffunctions on digital images
Diseño de laboratorios virtuales en Scilab para el estudio de armónicos en Circuitos eléctricos
No full textAchieving significant changes in the teaching-learning process through the use of ICT has been one of the foundations of the current curricular transformation in Higher Education, an aspect that gained significant importance during the Covid-19 pandemic. These transformations must manifest in the updating of pedagogical concepts and practices that involve redefining the role of the teacher and designing teaching-learning models different from traditional ones. It is precisely in this educational environment where virtual laboratories in Electrical Circuits courses emerge to promote the formation of knowledge and professional skills in students, as well as the development of autonomous, collaborative, and professionalized learning. The objective of the research is to design virtual laboratory practices for the study of harmonics in electrical circuits. The application is based on the free software Scilab and allows for the study of harmonics, as well as experimentation, demonstration, and design of electrical filters to mitigate their effects. The study was based on a mixed methodology in which analytical-synthetic and inductive-deductive methods were used, and as empirical methods, a survey was employed. The research was conducted in the Electrical Engineering program with a sample of 40 students. The results corroborate the importance of using virtual laboratories to improve the teaching-learning process post-pandemic.Obtener cambios significativos en el proceso de enseñanza-aprendizaje mediante el empleo de las TIC ha sido una de las bases de la actual transformación curricular en la Educación Superior, aspecto que tomó relevante importancia durante la Pandemia Covid -19, estas trasformaciones han de manifestarse en la actualización de las concepciones y prácticas pedagógicas que impliquen redefinir el rol del profesor y diseñar modelos de enseñanza-aprendizaje diferentes a los tradicionales. Es precisamente, en este entorno educativo, donde emergen los laboratorios virtuales en las asignaturas de Circuitos Eléctricos para promover la formación de conocimientos y habilidades profesionales en los estudiantes, así el desarrollo del aprendizaje autónomo, colaborativo y profesionalizado. El objetivo de la investigación es diseñar prácticas de laboratorios virtuales para el estudio de los armónicos en circuitos eléctricos. La aplicación está basada en el software libre Scilab y permite el estudio de los armónicos, así como la experimentación, demostración y diseño de filtros eléctricos para atenuar su efecto. El estudio se basó en una metodología mixta aplicada en la que se utilizaron los métodos analíticos–sintético e inductivo–deductivo y como métodos empíricos se empleó la encuesta. La investigación se desarrolló en la carrera de Ingeniería Eléctrica con una muestra de 40 estudiantes. Los resultados corroboran la importancia de utilizar los laboratorios virtuales para la mejora del proceso de enseñanza–aprendizaje post pandemia
Visualizando soluciones de EDP y Transformadas de Fourier mediante Ondas de Flexión
No full textThe concepts of Partial Differential Equations and Fourier Transforms are taught in the Mathematics courses of the first university years of both basic sciences and engineering. Both concepts are of capital importance for the training of future researchers, academics and engineers since a great number of physical phenomena present their theoretical modeling by means of these two relevant branches of Mathematics. In this work we use the one-dimensional flexural waves in a solid elastic beam to contextualize a simple physical system that helps us to understand, as well as to deepen and to visualize in a simple way the intricacies of these two parts of the Mathematics curriculum of the first University courses. In particular, flexural waves are governed by a wave equation, which, unlike electromagnetic (vector) or acoustic (scalar) waves, is of fourth order. This has profound implications for how these waves propagate, such as dispersion. Normally, in the first university courses, the equations of the harmonic oscillator, i.e. of second order, are solved. By means of three project based learning tutorials, here the students are confronted with the solution of various boundary problems, using the method of separation of variables with transcendental equations that are not in general analytical. The students must obtain the ratios using Newton or secant type numerical methods. Moreover, a spatial Fourier transform would be used to obtain the dispersion relation of the flexural waves. An experimental system consisting of a free-free aluminum beam excited by a shaker will be scanned by a laser vibrometer to obtain the modal displacements and compared with those obtained theoretically to visualize the mathematical solutions.Los conceptos de Ecuaciones Diferenciales Parciales y Transformadas de Fourier se imparten en los cursos de Matemáticas de los primeros años universitarios tanto de ciencias básicas como de ingeniería. Ambos conceptos son de capital importancia para la formación de futuros investigadores, académicos e ingenieros ya que un gran número de fenómenos físicos presentan su modelización teórica mediante estas dos relevantes ramas de las Matemáticas. En este trabajo utilizamos las ondas de flexión unidimensionales en una viga elástica maciza para contextualizar un sistema físico sencillo que nos ayude a comprender, así como a profundizar y visualizar de forma sencilla los entresijos de estas dos partes del currículo de Matemáticas de los primeros cursos universitarios. En particular, las ondas de flexión se rigen por una ecuación de onda que, a diferencia de las ondas electromagnéticas (vectoriales) o acústicas (escalares), es de cuarto orden. Esto tiene profundas implicaciones en la propagación de estas ondas, como la dispersión. Normalmente, en los primeros cursos universitarios se resuelven las ecuaciones del oscilador armónico, es decir, de segundo orden. Mediante tres tutoriales de aprendizaje basado en proyectos, aquí los alumnos se enfrentan a la solución de diversos problemas de contorno, utilizando el método de separación de variables con ecuaciones trascendentales que no son en general analíticas. Los alumnos deben obtener las relaciones utilizando métodos numéricos de tipo Newton o secante. Además, se utilizará una transformada espacial de Fourier para obtener la relación de dispersión de las ondas de flexión. Un sistema experimental consistente en una viga de aluminio excitada por un vibrador será escaneado por un vibrómetro láser para obtener los desplazamientos modales. Los resultados serán comparados con los obtenidos teóricamente para visualizar las soluciones matemáticas
El ojo en la mesa: los museos de papel y el arte de la memoria
No full textThe article examines the illustrated sources of «imaginary museums» or «paper museums», which are collections of homogenized and standardized photomechanical reproductions of works of art. A novel style emerges because of the new spatial proximity among them, one which was not present among the original works. This extensive reproduction generates a pervasive interest in art, a hallmark of the image society, and exerts a profound influence on its cultural structure. The analysis commences with an examination of an exemplary case, the Mosaic of the Archetypes of Antiquity by Jean-Philippe-Guy Le Gentil, which is interpreted according to Frances Yates as one of the artifacts of memory. A correlation is established between this mnemonic technique and the contemporary mass collections of the major publishing houses that have released encyclopedias of art history. It is determined that these paper museums are inadequate in their representation of the original artistic experience; nevertheless, they serve a social pedagogical function by facilitating cultural transmission, surely imposing it. This process is influenced by a variety of agents, including historians, museographers, and the public. The agents contribute to the process by organizing the works of art in such a way as to activate interpretations and meanings previously unknown, but which structure the prevailing culture. Finally, the process is compared with the use of AI to generate uniformed artwork with the new algorithmic style.El artículo examina las fuentes ilustradas de los «museos imaginarios» o «museos de papel», colecciones homogeneizadas y estandarizadas de reproducciones fotomecánicas de obras de arte. Como consecuencia de su nueva proximidad espacial, surge entre ellas un estilo novedoso que no estaba presente en las obras originales. Esta reproducción masiva engendra un interés popular por el arte, sello distintivo de la sociedad de la imagen, y ejerce una profunda influencia en la estructura cultural. El análisis se inicia con el examen de un caso ejemplar, el Mosaico de los arquetipos de la Antigüedad, de Jean-Philippe-Guy Le Gentil, que es interpretado como uno de los artefactos de la memoria siguiendo a Frances Yates. Se establece una correlación entre esta técnica mnemónica y las publicaciones masivas contemporáneas de las grandes editoriales que han publicado colecciones de historia del arte. Se determina que estos «museos de papel» pueden ser inadecuados para representar la experiencia estética original, pero que, sin embargo, cumplen una función pedagógica social al facilitar la transmisión cultural, seguramente imponiendo una concreta. En este proceso intervienen agentes de la historia del arte, como los historiadores y los museógrafos, pero también el público en general. Los agentes contribuyen al procesamiento organizando de las obras de arte de manera que se activan interpretaciones y significados desconocidos hasta entonces, pero que estructuran la cultura imperante. Por último, se compara el proceso con el uso de la IA para generar obras de arte uniformadas con el nuevo estilo algorítmico
Morfología del recorrido: el contexto gallego como territorio de prácticas artísticas peregrinas
Get PDFThis work presents an overview of itinerant artistic practices developed in recent years in Galicia, focusing on how the act of walking becomes a form of creative expression and artistic production, particularly examining the morphology of the path itself. Through case studies, it analyzes works by artists such as Estelle Jullian, Sophie Whettnall, Richard Long, Hamish Fulton, and Ismael Teira, whose pieces are deeply connected with the Galician landscape and the dynamic between rural and urban spaces. These artistic practices explore how walking and urban paths relate to cultural, historical, and emotional themes, highlighting the Camino de Santiago as a space for inspiration and expression. The research, with a qualitative approach, employs documentary analysis, exhibition visits and artists' testimonies, addressing both visual creation and performative aspects.Este trabajo propone una panorámica de las prácticas artísticas itinerantes llevadas a cabo en los últimos años en Galicia, enfocándose en cómo el acto de caminar se convierte en expresión creativa y en producción artística, prestando especial atención a la morfología que adquiere el recorrido. Mediante estudio de casos, se analizan obras de artistas como Estelle Jullian, Sophie Whettnall, Richard Long, Hamish Fulton e Ismael Teira, cuyas piezas están conectadas con el territorio gallego y con la dinámica entre lo rural y lo urbano. Estas prácticas artísticas exploran cómo el caminar y los trayectos urbanos se vinculan a temas culturales, históricos y emocionales, destacando el Camino de Santiago como un espacio de inspiración y expresión. La investigación, de enfoque cualitativo, utiliza análisis documental, visitas a exposiciones y testimonios de los propios artistas, abordando tanto la creación visual como la cuestión performativa, entre otros