Nestor OrtizIndustrial University of Santander | UIS · OPALO: Optimization Group in Productive, Administrative and Logistics Systems
Nestor Ortiz
Ph.D. in Engineering
About
22
Publications
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115
Citations
Introduction
Additional affiliations
July 1997 - present
July 1997 - present
Education
January 2006 - July 2007
National University of Colombia. Medellín, Colombia
Field of study
- Operational Research
Publications
Publications (22)
New product development projects (NPDP) face different risks that may affect the scheduling. In this article, the purpose was to develop an optimization model to solve the RCPSP in NPDP and obtain a robust baseline for the project. The proposed model includes three stages: the identification of the project’s risks, an estimation of activities’ dura...
Redundancy based methods are proactive scheduling methods for solving the Project Scheduling Problem (PSP) with non-deterministic activities duration. The fundamental strategy of these methods is to estimate the activities duration by adding extra time to the original duration. The extra time allows to consider the risks that may affect the activit...
In the Project Scheduling Problem (PSP), the solution robustness can be understood as the capacity that a baseline has to support the disruptions generated by unplanned events (risks). A robust baseline of the project can be obtained from redundancy based methods, which are considered proactive methods to solve the stochastic project scheduling pro...
En este artículo se presenta un procedimiento que permite apoyar el proceso de decisión de los inversionistas al seleccionar un portafolio que cumpla con sus expectativas económicas y con aquellas relacionadas con Responsabilidad Social Empresarial (RSE). Para ello, se consideran criterios de rentabilidad y riesgo como medidas económicas, que abord...
Purpose: The goal of this article is to provide an extensive literature review of the models and solution procedures proposed by many researchers interested on the Project Scheduling Problem with non-deterministic activities duration.
Design/methodology/approach: This paper presents an exhaustive literature review, identifying the existing models...
El artículo presenta el diseño de un modelo de calidad a partir de una revisión de literatura que integra los principios de Lean Healthcare, los requisitos de ISO 9001 y estándares de acreditación de instituciones de salud nacionales e internacionales. El mejoramiento de la calidad del servicio ofrecido y el crecimiento del PIB del sector salud col...
La filosofía Lean a través del tiempo ha evolucionado y ha sido implementada en varios tipos de empresas tanto en el sector manufacturero como en el de los servicios, lo cual se evidencia en el gran número de estudios que investigan sobre la implementación de lean en dichos sectores. El propósito de este estudio es analizar las tendencias de las pu...
This paper presents a procedure to support the decision making process of the investors to select a portfolio that meets their expectations, when they are related with both economic and corporate social responsibility (CSR) criteria. Rentability and risk criteria were considered as economic measures; which addressed from the method of constraints r...
En este artículo se presenta un procedimiento que permite apoyar el proceso de decisión de los inversionistas al seleccionar un portafolio que cumpla con sus expectativas económicas y con aquellas relacionadas con Responsabilidad Social Empresarial (RSE). Para ello, se consideran criterios de rentabilidad y riesgo como medidas económicas que, abor-...
Resumen
El presente estudio tiene como objetivo identificar la relación de los factores de capital humano (experiencia y escolaridad) en el estilo de liderazgo de los gerentes de las empresas del Área Metropolitana de Bucaramanga – AMB (Colombia). Partiendo de la revisión de la literatura, el desarrollo metodológico de la investigación se basa en...
El presente estudio tiene como objetivo determinar la relación del estilo de liderazgo del gerente en el desempeño de las empresas del Área Metropolitana de Bucaramanga - AMB (Colombia). La investigación se realizó aplicando teoría de Bass, usando un instrumento validado, Cuestionario de Estilos de Liderazgo - CELID, mediante un estudio transversal...
This paper proposes a new mathematical model for the scheduling of employees. The problem consists in finding and optimal scheduling method that will balance the workload and avoid dissatisfaction and low performance problems, due to work overload or sudden changes in the workload. We will employ hypothesis testing based on the normalized Bernoulli...
Este artículo estudia el desempeño de los meta-heurísticos Optimización de Enjambre de Partículas y Algoritmos Genéticos en
el problema de formación de celdas de manufactura de una empresa que desea organizar de manera eficiente tres escenarios de producción:
cuatro, cinco y seis celdas de manufactura para la fabricación de 30, 40 y 50 productos di...
This article reviews the literature on different models for the improvement of processes developed as a key to aligning business operations with strategic priorities. The aim is to provide useful information about the anatomy of the literature in this area of knowledge, presenting a unified framework of articles explored chronologically, from the t...
This paper presents the characterization of the performance level of processes management in service institutions, clinics and hospitals in the city of Bucaramanga and its metropolitan area. The study was made on the census of complexity levels II and III clinics and hospitals. A model was structured consisting of 5 criteria and multicriteria, char...
Process redesign methodologies have several conditions that enterprises must reach to obtain a more efficient implementation process. Up to now, there is not a clear definition of these re-quirements. This paper presents the conditions for manufacturing enterprises, based on a re-view of the maturity models that apply to these kinds of companies. T...
This paper refers to a design of a methodology that is capable to evaluate the exactitude of piecewise approximation used in the restriction of hydroelectric generation in order to resolve the hydrothermal economic dispatch problem while using mixed binary linear programming. The exactitude of the estimate value of hydraulic power depends on how re...
Este artículo hace referencia al desarrollo de una metodología que permite evaluar la exactitud de la aproximación por tramos realizada sobre la restricción de generación de energía hidroeléctrica a fin de resolver el problema del despacho hidrotérmico de mínimo costo por medio de la programación lineal binaria mixta. Teniendo en cuenta que la vali...
This paper presents a methodological proposal to solve the location of industrial and enterprise installation problem. This malter arises when a company is about to expand its commercial operations or when a new enterprise is to be created. The model contains two phases: the first one is based on the heurístic method of location factors ponderation...
