PERT Technique Research Articles

Enhancing supply chain efficiency: a holistic examination of hybrid forecasting models employing mode and PERT technique as deterministic factors

ABSTRACT Inaccurate forecasts can cause severe financial consequences and disrupt supply chain operations for organisations. This study focuses on the pharmaceutical industry, renowned for its complex supply chain and diverse data attributes. It proposes a novel approach to identify the optimal combination of demand forecasting models that enhance accuracy by leveraging deterministic factors using Mode and PERT. By refining model selection in the pharmaceutical industry, this research aims to improve both forecasting precision and supply chain efficiency. A four-level framework based on deterministic factors is proposed to evaluate the extent of hybrid modelling in demand forecasting, empowering practitioners to make informed decisions even in challenging circumstances. The findings offer decision-makers flexibility in selecting suitable forecasting models and assist in tailoring methods to specific conditions. Furthermore, this research highlights the industry's ability to leverage digital technologies and transform existing forecasting methodologies, ensuring uninterrupted business operations during disruptions such as the COVID-19 pandemic.

The process timeline for sustainable construction management: case study in the construction of an educational centre

Entrepreneurship is hard work, especially when it comes to the creation of an innovative, ecologically correct and sustainable project, and the small entrepreneur, in addition to facing bureaucratic and fiscal obstacles, has great difficulty in running his business, planning and optimizing his production for lack structured management knowledge. This is what happens with the company studied, where the construction of an educational centre, thought to be a model of ecological and sustainable building, did not have a schedule of execution, thus becoming dependent on very short term planning, accomplished at each step, rather than a structured action as a whole. In this sense, the Critical Path Method (CPM), which uses simple estimates for the duration of the building stages and the PERT technique, was implemented among a variety of schedules and methods for planning and control of works execution. This method is suitable and simple to use by small businesses. This methodology, easy to be understood and implemented, generated benefit to the company, allowing planning, predictability and control of the works.

Modeling and Simulation of Holonic Meta-Algorithm in Scheduling Process Using PERT Technique − Optimization in Job Shop Scheduling Problem

In generally scheduling can be viewed as optimization, bound by sequence and resource constrain and the minimization of the makespan is often used as the criterion. In this paper minimization of the makespan or complete time will be used such as an objective function and not the criterion of the decision. The new approach use heuristic elementary priority dispatch rules as the criterion of the decision. This research purpose a new methodology which use a specific elements of PERT techniques to find the optimum solution. New approach establish a solution's space where are find the all solution of the problem. Determination of the solution's space is realized by a meta-algorithm which take in account all the variant of the solutions of the process.

The Effects of Different Activity Distributions on Project Duration in PERT Networks

The original PERT technique assumes β distribution for the activity durations. The developments of the past decades have partly refuted this concept; and many different distributions have been introduced.In our research, various distributions (uniform, triangular, β) are applied in case of closed large-scale infrastructure projects.In this paper, the possible effects of these distributions on the project duration are investigated. It is shown that the use of different distributions with the same three-point estimation has a smaller effect on the project duration than a 10% difference in the values of the three-point estimation.

Research of a New Model to Optimize Resource Allocation

In construction project, it is important for managers to optimize resource allocation. It leads to get the optimum time and control cost. In this paper, we get a new approach to optimize resource allocation through analyze the time-cost curve and PERT technique. It is easy to use this method even if the information is limited.

A new method for constructing a minimal PERT network

A project is an enterprise consisting of several activities which are to be carried out in some specific order. The activities and the order in which they need to be carried out can be represented by a PERT network. The PERT technique is a traditional, well-known approach to the expert of project management. When networks are used, it often becomes necessary to draw dummy activities. Since the computation of project completion time is proportional to the number of arcs, including dummy arcs, it is desirable to draw a network with as few dummy activities as possible. In this paper, we propose a new method for constructing, for a given project scheduling problem, a PERT network having as small as possible the number of dummy arcs by using some results on line graphs. This algorithm deals with the existence of transitive arcs. The paper contains illustrative examples, proofs of some theoretical results as well as a comparative study with a similar algorithm known in the literature. Computational results showed the superiority of our algorithm.

Random PERT: application to physical activity/sports programs

This paper illustrates the variety of PERT technique known as random PERT. The aim of this technique is to help plan the duration of activities, something which can be particularly difficult in psychosocial programs. Thus, this task is often carried out by experts, who know that there are many events which may modify the proposed calendar. The paper includes an empirical illustration of random PERT applied to a physical activity/sports program for elderly people.

Algorithms in graph theory and their use for solving problems in architectural design

The authors' work on developing models based on graph theory to solve problems in architectural design is summarized. The models presented are aimed at helping designers in the initial stages of design. Plans are represented by graphs and the Max-flow Min-cut algorithm is described for decomposing complex graphs. The PERT technique is used to transform graphs into plans.

Use of systems analysis and management systems in project planning and evaluation

The purpose of this paper is to illustrate possible relationships which can exist between the techniques of systems analysis and management information systems as they might be employed in the planning of an educational project and management control of the project during the operational phase. Systems analysis employs a principle of disassembly to determine the unit elements which make up the total system. Using this principle, the essential elements of a project can be delineated which lead to the accomplishment of the project objective. The result of this step is essentially the same as the first step in the application of management systems which is that of project definition. Within the PERT technique, this step is normally identified as the work breakdown structure. Based upon the project definition phase, the network is then constructed which is basically a synthesis of the elements identified through the principle of disassembly but where the elements are now sequenced with their necessary interrelationships and dependencies and placed within a time frame for management control.