Papers by Author: Liviu Morar

Abstract: The main purpose of the paper is to develop a neural network application that could predict the tool-workpiece vibration. Increase efficiency by decreasing vibrations has been imposed by the cutting progresses theory and the fields related directly to the cutting process. Thus, this procedure aims to an increasing efficiency, lowering costs and execution time and also improving the quality of parts.

Abstract: From a purchasing point of view, it can be argued that in order for a supply chain to be efficient the cost of purchasing must be balanced with risk pertaining to the supply market and the purchased product. To decide on the appropriate forms of supplier relationships today, we argue that there are three main dimensions to be considered: A more complex environment. Supply chain efficiency. Product life cycle.

Abstract: Between regularity of production, selling goods and regularity of supply units need to be a perfect timing and a perfect collaboration. The paper presents the policies that can occur in each production systems, and the benefits that can be obtained from the collaboration between the systems elements. The competitive advantage is ensured through the harmonization of the three processes of the company and through the integration of the logistics chain of all upstream and downstream organizations in order to ensure a high level of consumer service at economical costs.

Abstract: The main purpose of the paper is to develop a neural network application destined to the raw material stock management, as an performant alternative to the classical models of costs stock management. Stocks of goods that manufacturers would classify as raw materials stocks are, in a special sense, goods in early stages of the production process. The testing was made for three companies from the automotive industry, but it could be applied to any kind of Romanian organization.

Abstract: Finding productive performance of a producer is a topical issue on the basis of which has been and are done a large number of research. Currently there are several productive performance measurement techniques detailed in various forms, among which the most used are the efficiency and the productivity. The work presents the comparative measurement of the efficiency and productivity for a processing activity of specific products from machines constructions, organized in several enterprises in the area of N-V of Romania, between the intervals 2005-2010. This study uses data envelopment analysis (DEA) to measure the utilization capacity in six enterprises. Malmquist index method used in this research indicates that there is the tendency to increase or decrease the productivity and efficiency of the studied enterprises. Identification of positive or negative trend productive performance can be used to prepare a strategy of reducing inefficiencies and improving effectiveness of production process. Specifically, this study quantifies the level of technical efficiency and technical change in this particular manufacturing sector.

Abstract: The paper presents the mathematical model of abrasive waterjet milling process. Based on analysis of existing models the authors realize a new mathematical model, considering some simplifying hypothesis. This model uses output data from model [1] and determines the advance speed, the consumption of the abrasive and the productivity of the process. To establish the productivity of the process and the advance speed we’ll use the “energy preservation” model. This model takes in account the material characteristics. The mathematical model has been solved numerical and the results have been interpreted.