Grado de madurez en la gestión de proyectos de la empresa constructora Sánchez Foliaco Ingenieros S.A.S., de Bogotá D.C.

Trabajo de investigaciónEl presente documento presenta los resultados de la investigación realizada a la empresa de ingeniería SÁNCHEZ FOLIACO INGENIEROS S.A.S, empresa constructora, cuyos ingresos dependen de la ejecución de proyectos. El objetivo de la investigación es validar el grado de madurez que ha logrado alcanzar SÁNCHEZ FOLIACO S.A.S., luego de tres años de haberse formalizado, y adoptar políticas que orienten sus esfuerzos a una mejor actuación en la Gestión de Proyectos, elevando sus niveles de madurez con el pasar del tiempo. En los diferentes capítulos se muestran las actividades de investigación para el diagnóstico en Gestión de Proyectos. Los objetivos generales y específicos, están encaminados a determinar el grado de madurez que ha alcanzado SÁNCHEZ FOLIACO INGENIEROS S.A.S., en la Gestión de Proyectos desde su creación como empresa constructora.EspecializaciónEspecialista en Gerencia de Obras Civile

Modelo de regresión semiparamétrico robusto

El presente trabajo de tesis presenta un modelo de regresión semiparamétrico con errores t-Student, que permite estudiar el comportamiento de una variable dependiente dado un conjunto de variables explicativas cuando los supuestos de linealidad y normalidad no se cumplen. La estimación de los parámetros se realiza bajo el enfoque bayesiano a través del algoritmo de Gibbs. En el estudio de simulación se observa que el modelo propuesto es más robusto ante la presencia de valores atípicos que el usual modelo regresión semiparamétrico normal. Asimismo se presenta una aplicación con datos reales para ilustrar esta característica

Elaboración de un plan estratégico de desarrollo para la empresa comercial la central, del cantón La Maná, provincia de Cotopaxi; periodo 2014-2018

This investigation has determined that it is necessary to realize of a diagnosis of the present situation of the company in relation to the knowledge of development plans; this information provided the necessary aspects to optimize the resource of a strategic direction, and also by structuring the SWOT profile. It has been obtained the base for the development of the principles, values and objectives’ company; the used methodology was based on the non-experimental design in order to analyze the real data, to determine recommendations, and to the design of the Strategic Development Plan. As a result, it was possible to show that the company needs proper guidance for taking decisions just because they have not provided the desired results....El presente trabajo de investigación ha determinado que es necesario la realización de un diagnóstico de la situación actual de la empresa con relación a los conocimiento sobre planes de desarrollo, éstos datos proporcionaron la información necesaria para la optimización del recurso de direccionamiento estratégico; además mediante la estructuración del perfil F.O.D.A. se logró obtener la base para la elaboración de los principios, valores y objetivos de la empresa; la metodología utilizada se fundamentó en el diseño no experimental para realizar un análisis de datos reales orientados a determinar recomendaciones para el diseño del Plan de Desarrollo Estratégico...

Development and feasibility testing of an education program to improve knowledge and self-care among Aboriginal and Torres Strait Islander patients with heart failure

INTRODUCTION: There is a 70% higher age-adjusted incidence of heart failure (HF) among Aboriginal and Torres Strait Islander people, three times more hospitalisations and twice as many deaths as among non-Aboriginal people. There is a need to develop holistic yet individualised approaches in accord with the values of Aboriginal community health care to support patient education and self-care. The aim of this study was to re-design an existing HF educational resource (Fluid Watchers-Pacific Rim) to be culturally safe for Aboriginal and Torres Strait Islander peoples, working in collaboration with the local community, and to conduct feasibility testing.  METHODS: This study was conducted in two phases and utilised a mixed-methods approach (qualitative and quantitative). Phase 1 used action research methods to develop a culturally safe electronic resource to be provided to Aboriginal HF patients via a tablet computer. An HF expert panel adapted the existing resource to ensure it was evidence-based and contained appropriate language and images that reflects Aboriginal culture. A stakeholder group (which included Aboriginal workers and HF patients, as well as researchers and clinicians) then reviewed the resources, and changes were made accordingly. In Phase 2, the new resource was tested on a sample of Aboriginal HF patients to assess feasibility and acceptability. Patient knowledge, satisfaction and self-care behaviours were measured using a before and after design with validated questionnaires. As this was a pilot test to determine feasibility, no statistical comparisons were made.  RESULTS: Phase 1: Throughout the process of resource development, two main themes emerged from the stakeholder consultation. These were the importance of identity, meaning that it was important to ensure that the resource accurately reflected the local community, with the appropriate clothing, skin tone and voice. The resource was adapted to reflect this, and members of the local community voiced the recordings for the resource. The other theme was comprehension; images were important and all text was converted to the first person and used plain language. Phase 2: Five Aboriginal participants, mean age 61.6±10.0 years, with NYHA Class III and IV heart failure were enrolled. Participants reported a high level of satisfaction with the resource (83.0%). HF knowledge (percentage of correct responses) increased from 48.0±6.7% to 58.0±9.7%, a 20.8% increase, and results of the self-care index indicated that the biggest change was in patient confidence for self-care, with a 95% increase in confidence score (46.7±16.0 to 91.1±11.5). Changes in management and maintenance scores varied between patients.  CONCLUSIONS: By working in collaboration with HF experts, Aboriginal researchers and patients, a culturally safe HF resource has been developed for Aboriginal and Torres Strait Islander patients. Engaging Aboriginal researchers, capacity-building, and being responsive to local systems and structures enabled this pilot study to be successfully completed with the Aboriginal community and positive participant feedback demonstrated that the methodology used in this study was appropriate and acceptable; participants were able to engage with willingness and confidence

Dispersive Elastodynamics of 1D Banded Materials and Structures: Design

Within periodic materials and structures, wave scattering and dispersion occur across constituent material interfaces leading to a banded frequency response. In an earlier paper, the elastodynamics of one-dimensional periodic materials and finite structures comprising these materials were examined with an emphasis on their frequency-dependent characteristics. In this work, a novel design paradigm is presented whereby periodic unit cells are designed for desired frequency band properties, and with appropriate scaling, these cells are used as building blocks for forming fully periodic or partially periodic structures with related dynamical characteristics. Through this multiscale dispersive design methodology, which is hierarchical and integrated, structures can be devised for effective vibration or shock isolation without needing to employ dissipative damping mechanisms. The speed of energy propagation in a designed structure can also be dictated through synthesis of the unit cells. Case studies are presented to demonstrate the effectiveness of the methodology for several applications. Results are given from sensitivity analyses that indicate a high level of robustness to geometric variation.Comment: 33 text pages, 27 figure

Optimización del diseño estructural, enfocado en el costo de edificaciones educativas de concreto armado

Actualmente existen metodologías de optimización estructural que emplean algoritmos sofisticados, sin embargo éstas no son aplicadas en la mayoría de los proyectos de estructuras, debido a su complejidad así como la especialización y capacitación necesaria en temas específicos y avanzados de optimización aplicada, lo que no está suficientemente difundido entre los proyectistas de estructuras. Con el objetivo de contribuir al conocimiento sobre la optimización del diseño de estructuras de concreto armado, se ha desarrollado un procedimiento aproximado, basado en estrategias de minimización de la cantidad de variables activas, optimización de subestructuras, aplicación de criterios de optimización, procedimientos de construcción e inspección gráfica de los espacios de diseño. El procedimiento desarrollado, tiene como función objetivo a minimizar el Costo Directo de Estructuras, se ha aplicado en un número finito de casos para edificaciones de concreto armado, uso educativo, correspondientes a pabellones de aulas de entre dos y cinco niveles y de tres a cuatro aulas por nivel. Los resultados de la aplicación de la metodología llevan a la conclusión que el Costo Directo de Estructuras disminuye si se proyecta con: concretos premezclados de resistencias superiores a 21 MPa (210 kgf/cm2), losas aligeradas con bloques de poliestireno expandido (tecnopor), con dimensiones de la sección transversal de columnas, placas y vigas determinadas a través de la inspección gráfica del espacio de diseño, así también, si el proyecto considera la interacción entre los tabiques de albañilería y la estructura de concreto armado, donde los tabiques tienen altura completa y estén distribuidos en forma simétrica en referencia al centro de masa y acoplados a la deformación lateral de la estructura, para incrementar la rigidez lateral de ésta.Tesi

Nuevo Corinto: A Chiefly Village in Northeastern Costa Rica

Archaeological research at Nuevo Corinto has provided information on the emergence of complex village patterns in northeastern Costa Rica. This includes an improved chronology of in situ culture change over a 3000-year period. The consolidation of an architectural core began ca. AD 400-600 with the principal period of construction of circular elevated platforms for supporting domestic structures, reaching peak construction ca. AD 700-1100. Nuevo Corinto, together with neighboring sites, appears to have been a major node in trade networks extending from the Caribbean to the Pacific coasts. Our research has provided details on the emergence and growth of architectural units and hydraulic features in this village, a center of manufacturing, trade, and social hierarchy in the Caribbean lowlands.UCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Sociales::Centro de Investigaciones Antropológicas (CIAN)UCR::Vicerrectoría de Docencia::Ciencias Sociales::Facultad de Ciencias Sociales::Escuela de Antropologí

Identifying Near-Optimal Single-Shot Attacks on ICSs with Limited Process Knowledge

Industrial Control Systems (ICSs) rely on insecure protocols and devices to monitor and operate critical infrastructure. Prior work has demonstrated that powerful attackers with detailed system knowledge can manipulate exchanged sensor data to deteriorate performance of the process, even leading to full shutdowns of plants. Identifying those attacks requires iterating over all possible sensor values, and running detailed system simulation or analysis to identify optimal attacks. That setup allows adversaries to identify attacks that are most impactful when applied on the system for the first time, before the system operators become aware of the manipulations. In this work, we investigate if constrained attackers without detailed system knowledge and simulators can identify comparable attacks. In particular, the attacker only requires abstract knowledge on general information flow in the plant, instead of precise algorithms, operating parameters, process models, or simulators. We propose an approach that allows single-shot attacks, i.e., near-optimal attacks that are reliably shutting down a system on the first try. The approach is applied and validated on two use cases, and demonstrated to achieve comparable results to prior work, which relied on detailed system information and simulations.Comment: This paper has been accepted at Applied Cryptography and Network Security (ACNS) 202