<p>Rad,Edukativni i op&scaron;ti model kritičnih protoka materijala PD - Precedence Diagramming Structure, predstavlja integralni deo teorijskih i eksperimentalnih istraživanja vezanih za razvoj stohastičkih mreža PD-modela iz operacionih istraživanja, kao i modela za odgovarajuću edukaciju kadrova iz oblasti mrežnog upravljanja tokovima materijala u ma&scaron;inogradnji. U tom smislu u radu su razvijeni i re&scaron;avani, putem analitičkih i numeričkih metoda, sledeći modeli:</p><ul><li>Mrežni PD-model sa jednim kritičnim tokom.</li><li>Mrežni PD-model sa isključivo autonomnim (paralelnim) kritičnim tokovima.</li><li>Op&scaron;ti model sa varijantom kritičnih tokova autonomno-unijatnog tipa.</li><li>Edukativni model za efikasno re&scaron;avanje postavljenih problema upravljanjatokovima materijala u pojedinačnoj proizvodnji.</li><li>Modeli za vrednovanje metoda i postupaka iz ovih oblasti operacionih istraživanja, kao i samog edukativnog modela, na bazi razvijenih kvantitativnih i kvalitativnih kriterijuma.</li></ul><p>Ovim istraživanjem stvorene su određene podloge za dalji rad u predmetnom području, posebno sa stanovi&scaron;ta neinvesticionog povećanja efekata materijalne proizvodnje, putem primene razvijenih opercionih modela i edukativnih metoda za njihovo re&scaron;avanje.</p> / <p>The paper &quot;THE EDUCATIVE AND GENERAL MODEL OF THE CRITICAL MATERIAL FLOWS, PD-PRECEDENCE DIAGRAMMING STRUCTURE&quot; makes the integral part bof the theoretical and experimental researches connected for the development of the stochastic network PD - models of the opertions research, as well the models for the appropriote personal cadres edu cation in the field of network control of materijal flows in production of machinery. In the paper are also developed and solved, by analytic and numeric methods, the next models:</p><p>* The network PD-model with one critical flow.</p><p>* The network PD-model with excusively autonomus (parallel) critical flows.</p><p>* The general model with the variant of the critical flows of the autonomus -uniate type.</p><p>* The educative model for the effective solving of the stated problems of the material flows control in isolated production.</p><p>* The models and methods valuation of these fields of the operations researches, as well the educative model itself on the basic of the developed quantative and qualitative criteria.</p><p>With these researches are created the defined bases for further work in the subject field, particularly from the attitude of the noninvestment increasing of the effects of the materijal production, using the developed operations models and the educative models for their solving.</p>

Esta Tesis doctoral representa una nueva formulación del problema del GRCPSP (Generalized Resource-Constrained Project Scheduling Problem) mediante grafos PDM (Precedence Diagramming Method) con fragmentación en entornos realistas, donde las tareas son diferenciadas entre productivas y no productivas y las dependencias entre ellas no se limitan a los ya clásicos valores de dependencia, sino que se incorpora un nuevo concepto de relación de producción, apareciendo relaciones basadas en un cierto nivel de producción necesario de otra tarea para poder comenzar, o cierta producción que quedará pendiente de finalizar una vez finalizada la tarea precedente. Este nuevo enfoque del problema basado en procesos productivos, no solo elimina las paradojas causadas por las tareas críticas inversas o críticas perversas, sino que nos permite aplicar conceptos tradicionales de la planificación de la producción como es la productividad variable ocasionada por el aprendizaje con las repercusiones que esto produce en las relaciones basadas en producción. Además se analizan las naturalezas de los recursos intervinientes en el proyecto, reformulando los costes asociados a los mismos y su repercusión sobre el nuevo modelo propuesto, permitiendo la aplicación de algoritmos de optimización TCTP (Time Cost Trade-Off Problem) que hasta ahora era inviable. Para finalizar se incorpora la borrosidad a los valores intervinientes en el proyecto presentando la formulación de un modelo robusto de planificación de la producción basada en grafos PDM que sirve de punto de partida a la resolución del GRCPSP en entornos realistas. / Ponz Tienda, JL. (2010). GRCPSP Robusto basado en Producción para Proyectos de Edificación y Construcción [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/8540 / Palancia

The objectives of this thesis are to evaluate scheduling methods and most common construction project management software (CPMS) which are Primavera and MS Project, and to determine most widely used project scheduling techniques and CPMS with a survey. The thesis focus on project scheduling since it is very deterministic for project success. Evaluation results indicate that, Gantt Chart Method and PDM are useful for small to medium projects, CPM is for complex projects, PERT is for uncertain projects, and LOB Technique is for repetitive projects. The comparison between Primavera and MS Project show that Primavera is more robust, professional, and detailed while MS Project is cheaper and easier. The survey was completed with 22 participants from construction companies in the US and Turkey and the results demonstrate CPM and Gantt Chart Method are the most common methods. Also, MS Project is the most widely used CPMS followed by the Primavera.