1,026 research outputs found
Implementación de la Metodología 5S para mejorar la organización del almacén en una empresa metalmecánica, Lima, 2023
No full textEste estudio se enfoca en una empresa que ofrece soluciones integrales a las principales empresas metalmecánicas y concreteras del país. La empresa tiene una experiencia de 15 años en el mercado local. En consonancia con lo mencionado anteriormente, se busca mejorar la gestión de almacenamiento a través de la metodología 5S con el propósito de disminuir el tiempo necesario para despachar cada pedido. La implementación de la metodología 5S tiene como metas disminuir el tiempo que los empleados dedican a buscar productos en el almacén, ampliar el espacio aprovechable y reducir el porcentaje de registros con errores. Estos problemas específicos están generando retrasos en el proceso de despacho, lo que afecta la posición de la empresa en el mercado nacional.
Para lograr estos objetivos, se realizó una encuesta que comparó la situación antes de implementar la metodología con la situación posterior. Con base en esta información, se elaboró un plan de implementación que abarcó aproximadamente seis meses y que describió los pasos seguidos para llevar a cabo cada uno de los "S".
Los resultados obtenidos muestran una reducción del 52.25% en el tiempo que los operadores tardan en encontrar los productos, una disminución del 38.14% en el porcentaje de pedidos con errores, un aumento del 11.73% en el espacio utilizable.
En conclusión, una implementación satisfactoria requiere el compromiso de todos los colaboradores y una formación continuaSubmitted by Veronica RubinDeCelis ([email protected]) on 2024-03-07T01:46:49Z
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T030_72606394_T Chavez Espinoza, Jonathan Pedro.pdf: 3222700 bytes, checksum: 24ec18aaf95de2b4c2a309e677e743ec (MD5)Made available in DSpace on 2024-03-07T01:46:49Z (GMT). No. of bitstreams: 1
T030_72606394_T Chavez Espinoza, Jonathan Pedro.pdf: 3222700 bytes, checksum: 24ec18aaf95de2b4c2a309e677e743ec (MD5)
Previous issue date: 2023Tesi
Neuropsychological constraints to human data production on a global scale
No full textWhich are the factors underlying human information production on a global level? In order to gain an insight into this question we study a corpus of 252–633 mil. publicly available data files on the Internet corresponding to an overall storage volume of 284–675 Terabytes. Analyzing the file size distribution for several distinct data types we find indications that the neuropsychological capacity of the human brain to process and record information may constitute the dominant limiting factor for the overall growth of globally stored information, with real-world economic constraints having only a negligible influence. This supposition draws support from the observation that the files size distributions follow a power law for data without a time component, like images, and a log-normal distribution for multimedia files, for which time is a defining qualia.
Author summary: The generation of new information is limited by two key factors, by the incurring economic costs and by the capacity of the human brain to process and store data and information; the controlling agent needs to retain an overall understanding even when data is generated by semiautomatic processes. These processes are reflected in the statistical properties of the data files publicly available on the Internet. Collecting a corpus of 252–633 mil. files we find that the statistics of the file size distribution are consistent with the supposition that data production on a global level is shaped and limited by the neuropsychological information processing capacity of the brain, with economic and hardware constraints having a negligible influence
Arizona History: A Chicano Perspective (1750's-1950's)
No full text1750's-1890's
Part II: The Struggle: This three part program traces the Chicano heritage and influence in the pioneering of Arizona's first settlements, highlighting the Mexican contribution to the economic development of the territory as well as the racial conflicts they experienced with the arrival of the Anglo-American in the area.
Part I: The PioneerCopyright, Chicano Media Productions, 1985. Presented by permission of Dr. Christine Marin. A higher resolution version is available
Histological studies on the origin of planulae of the coral Pocillopora damicornis
No full textThe coral Pocillopora damicornis develops gonads and releases planulae on a lunar cycle throughout most of its range. Planulae of P. damicornis in some populations display the same allozyme pattern as their mother colonies, suggesting that planulae might be produced asexually. To investigate the origin of planulae in this coral, histological studies on maturation of oocytes and early development of planulae were performed on P. damicornis in Okinawa, Japan. Small branches 3 to 5 cm long were sampled for histological observation from 7 colonies every day from August 24 to 30 and September 26 to 30, 1997. Blastula- and gastrula-like stages were observed for the first time in P. darnicornis. Blastula-like embryos consisted of a poorly defined cellular cover over an indistinct yolky mass, and were approximately the same size as mature oocytes, ca 100 pm in diameter. Oocytes occurred in 2 size classes, small (50 pm). A continuous series of planula developmental stages from blastulae to planulae was documented. The appearance of early embryos and small plandae occurred about the time that large oocytes disappeared. These observations, together with a lack of any sign of production of planulae by budding, strongly suggest that planulae of P. damicornis in this population are derived from oocytes that undergo typical embryogenesis
Map indicating approximate range boundaries for Douglas squirrels (blue), red squirrels (red), and the hybrid zone (purple) in the North Cascades region.
No full textRange shapefiles developed from published descriptions [49, 50] by A.S. Chavez. Symbols indicate sampling localities. Some specimens within the hybrid zone geographically overlap, see S1 Table for complete specimen details. Basemap reprinted from Terrain With Labels under a CC BY license, with permission from ESRI, original copyright 2016.</p
A ALBA e a luta pela hegemonia no continente americano: uma topologia do discurso bolivariano
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas. Programa de Pós-graduação em Sociologia PolíticaO objetivo da dissertação é analisar o movimento bolivariano, liderado pela Venezuela, enquanto projeto de construção de uma nova hegemonia na América Latina e o Caribe. Tal projeto se constrói discursivamente em oposição à histórica hegemonia pan-americana liderada pelos Estados Unidos (EUA). Para isso é estudada a ALBA (Aliança Bolivariana para os Povos de nossa América) como organização internacional que facilita a alineação de países e sociedades latino-americanos em relação ao movimento bolivariano, gerando novas modalidades de construção de sentido, assim como novas vias e regras de relacionamento internacional. A pesquisa analisa os discursos de mandatários nas reuniões de Cúpula da ALBA, e, apelando à teoria do discurso de Ernesto Laclau, identifica nesse conjunto os três passos previstos pelo autor na configuração de um desafio hegemônico: (1) o estabelecimento de um antagonismo face ao imperialismo dos EUA que é identificado como o poder hegemônico institucionalizado, e a dicotomização do espaço social americano através da construção de uma fronteira entre esse poder e o resto da comunidade (América Latina e o Caribe); (2) a articulação contingente entre diversas demandas sociais, características da América Latina e do Caribe, cuja insatisfação é atribuída ao imperialismo dos EUA; e (3) a formação de um campo popular, através da expressão positiva dessas demandas numa nova identidade, no caso a identidade bolivariana. A pesquisa conclui que o movimento bolivariano consegue gerar elementos para permitir uma nova lógica de construção de sentido, configurando assim estruturalmente um campo de luta pela hegemonia. Porém, também são destacados vários problemas nessa tarefa, especialmente ligados à identificação de diversas unidades com o bolivarianismo.The dissertation research the Bolivarian Movement, headed by Venezuela, as a new hegemonic project, still under construction, at Latin America and the Caribbean. This hegemonic project is discursively constructed in opposition to the historic Pan American hegemony, led by the U.S. In this way, the Bolivarian Alliance for the Peoples of Our America (ALBA) is approached as an international organization that seeks to align the Latin American countries and societies behind the Bolivarian Movment. The ALBA generates new ways of sense-making, as well as new norms of international relations. The research analyzes the speeches at the ALBA's presidential summits, using the Ernesto Laclau's Discourse Theory, and identifying the three steps proposed by this author to the hegemonic construction: Firstly, the establishment of an antagonism against U.S. imperialism and the dicotomization of the hemispheric social space, through the definition of a boundary between the powerful country and the rest of continental community (Latina America and the Caribe). Secondly, the contingent articulation of a variety of social demands, which dissatisfaction are ascribed to the U.S. imperialism. Thirdly, the formation of a new popular field, through the positive expression on a new identity of this unified set of demands, in this case the Bolivarian identity. The dissertation concludes that the Bolivarian movement manages a new logic of sense-making, and therefore places the hegemonic struggle in a new structural field. However, it also identified some problems on this task, particularly in the difficulty to construct a Bolivarian identity shared by various social unities (countries, societies and social sectors)
Government expenditures as a citizens'evaluation of public output : public choice and the benefit principle of taxation
No full textCombining elements from the theories of public choice and benefit taxation, the author develops a framework in which private citizens can evaluate public activities. Why, and under what circumstances, do bureaucrats increase the size of the public sector and the amount of public spending in their own self interest? What does the private sector think public output should be, what is actual public output, and how does the private sector evaluate that output? The author applies the theoretical results of an attempt to answer these questions in four Central European countries (Czechoslovakia, Hungary, Poland, and Slovenia), using actual data for 1989-91 and projections for 1992. Interpreting indirect evidence, he shows that the private sector would prefer less government activity in all countries, from a low of 5 percent less public spending (in Poland) to a high of one-third less (in Slovenia). If those governments were to follow those guidelines, their spending-to-GDP ratios would more closely resemble the 1987-89 average for a selected group of European market economies. The author also introduces a more rigorous, if not necessarily more objective, approach to determining optimal government spending. This approach requires little information, but uses a static model and requires faith in the direction of causality for some key variables. To the extent that one can accept those limitations, the model may be a useful operational tool in public spending evaluation.Public Sector Economics&Finance,National Governance,Economic Theory&Research,Environmental Economics&Policies,Fiscal&Monetary Policy
Aplicación de técnicas de machine learning para la detección autónoma y eficiente de malezas en cultivos de maíz, 2023
No full textLa visión artificial es un pilar de la inteligencia artificial, capacita a las máquinas para analizar e interpretar imágenes permitiendo la identificación precisa de objetos; el objetivo de la presente investigación fue detectar y localizar malezas en cultivos de maíz empleando modelos basados en deep learning, para ello, se utilizó un dataset público de imágenes anotadas con dos clases: maíz y malezas; se entrenó de forma homogénea las variantes n, s, m, l y x de las familias YOLOv5u, YOLOv8 y YOLOv11; y se evaluó con las métricas de precisión, recall, F1, mAP 0.50 y mAP 0.50 y 0.95, el tiempo de entrenamiento y latencia por imagen, todos los modelos fueron ajustados en pesos base y se compararon sobre el mismo conjunto de evaluación. Los resultados mostraron que YOLOv8x alcanzó el mejor equilibrio entre sensibilidad y localización, con un recall de 0.698, F1 de 0.818, mAP@50 de 0.844 y mAP@50:95 de 0.752, superando a YOLOv5xu (F1 0.790; mAP@50:95 0.729) y a YOLOv11x (F1 0.754; mAP@50:95 0.705); en cuanto a las clases, la clase maíz mostró un desempeño alto y estable en todas las familias, y las malezas fue el factor limitante por la presencia de objetos pequeños y ocluidos, el costo computacional creció con la capacidad del modelo. En conclusión, principal fue adoptar YOLOv8x por su mayor sensibilidad y mejor mAP multiumbral y la validación con imágenes propias de campo, esto confirmó una buena adaptación al dominio, lo que justifica aceptar su mayor latencia
George W. Bush\u27s administration and new perceptions of interamerican relations
No full textU članku se razmatraju interamerički odnosi za administracije Georgea W. Busha i budućnost interameričkih odnosa. U analizi prvog Bushevog mandata naglasak je stavljen na ekonomska i politička pitanja, dok se u drugom mandatu pozornost posvećuje prijedlozima analitičara kakva bi trebala biti američka politika prema Latinskoj Americi. Autorica zaključuje da izazovi s kojima se SAD trenutačno u. Latinskoj Americi suočavaju (Hugo Chavez, ljevičari na vlasti, utjecaj Kine) nisu dovoljni da bi u bližoj budućnosti Latinska Amerika postala američki vanjskopolitički prioritet.Article deals with interamerican relations during the George W. Bush\u27 s administration as well as their future. Analyzing first Bush\u27s mandate the accent was placed on economic and political issues, whilst analyzing the second one the attention was focused on analysts views of American policy toward Latin America. Author concludes that current challenges facing USA in Latin America (Hugo Chavez, left-wing administrations, China\u27s influence) are not sufficient to make Latin America a foreign policy priority to the USA
Modeling of high speed erosion with a morphological updating routine
No full textErosion is a phenomenon present in several industrial processes. In dredging, the jetting of sand in drag heads erodes the sand bed. In construction of offshore infrastructure such as wind turbines, oil and gas production units, marine pipelines, erosion of material near the foundations can put the stability of structures at stake. Furthermore, rivers or even tsunamis are some of the natural phenomena that can be the cause of erosion. C. van Rhee, 2007 and Bisschop et al., 2015, distinguished two regimes for the erosion of sand dependent on the fluid velocity. On one hand, for low flow velocities, 0.5-1m/s, the erosion process is dependent on the size and the density of the sand grains. On the other, for flow velocities >1.5 m/s, the upper layers of sand are sheared. Densely packed sand has a dilatant behaviour to shearing (see image). This dilatant behaviour leads to a drop of pressure in the interior of the sand-bed, creating a hydraulic gradient and forcing water to flow towards the interior of the sand-bed to fill the voids. The hydraulic gradient caused by the drop in pressure acts against the eroding forces adding resistance to the erosion process. This regime is defined as hindered erosion. The improvements in computing power have led to a spread in the use of numerical modelling for industrial purposes. The aim of this thesis is to develop a numerical solver able to model the behaviour of sand-water mixtures with an emphasis on the erosive process. The numerical model was developed in C++ using the Foam-extend 3.2 framework. The sand is modelled using 2 different approaches. It is modelled as a continuum when in suspension and, through the morphological updating routine when settled in a sand-bed. The fluid motion is modelled by a transient incompressible fluid solver (P.I.S.O) using a collocated arrangement of the unknowns. The momentum exchange between suspended sand grains and the fluid is approached by the Boussinesq approximation of the density. The transport of suspended sand is modelled by an advection-diffusion relation, including the hindered settlement effect. The turbulence model is a standard k-ε model. The erosion process is here modelled using the pick-up flux approach (van Rijn, 1984), with a modified stability criterion (θ_cr). X. Lui, 2008 and N. Jacobsen, 2011, corrected the stability criterion calculated from the sand grain properties (θ_(cr,0)) to include the slope effect (θ_slope). For this work, and following the formulation proposed by van Rhee, 2007, the stability criterion will be corrected to include the resistance due to the dilatant behaviour presented previously in this abstract (θ_vR). θ_cr=θ_(cr,0) (θ_slope+θ_vR ) The solver developed was used in two test cases. First, a settling test, with an initial concentration of sand of c=0.3. For this model, the solver shows a good behavior modeling the settling of sediment, nevertheless, the settling velocity is slightly higher than the one seen in the test. In the high speed erosion test, the velocity above the bed varies from 0-6 m/s. The fitting parameter of this model is the bed roughness; which for this test is 1.05 cm. The bed roughness (ks) was fitted to have the same erosion time. The calculated sand-bed height has values similar to the experimental results. The conservation of sediment presents satisfactory results as the error is lower than 1%, for the settling and the erosion test case. The automatic mesh motion presents certain limitations in this specific application. In the settling case an important shrinking of the mesh will lead to instabilities in the calculations of other fields. In the erosion test, the upper row of cells is greatly deformed sacrificing accuracy near the upper boundary. The mesh deformation should be explored more in depth in further studies.Mechanical, Maritime and Materials EngineeringMarine and Transport TechnologyOffshore and Dredging Engineerin
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