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Vol. 20 (2019), No. 2 (58), 2019

 

This issue of the RECENT journal was edited with the support of:

CONTENTS



  • Mariana FRATU, Iulian Dorin SBANCA

Virtual Prototyping Technique in Active Learning

https://doi.org/10.31926/RECENT.2019.58.044

Abstract

In this paper, we continue to develop the virtual prototypes models and their testing for active learning support with Erasmus students. The personalized applications selected by a tutor are used directly for performing active learning at the university's detached workplace. When using the virtual prototypes, the main strategy of the informatics support is based on the developing informatics tools which are adapted for a pedagogical - engineering content. On-line learning outcomes materials, as virtual prototypes, were created last years and tested on the informatics environment. Some of them were also investigated as the "active elements" for active learning, especially for writing stage rapports including practical projects. The practice showed that the testing of issues such as the practical placement stage work can result in an active learning process. The domain of investigation is the virtual prototyping. The virtual product development replaces traditional material object test with digitized form product by building productís digital model. It offers to analyse product's static and dynamic characteristics on the circumstance of digital state, and rebuild and improve the original design. Virtual prototype technology is a kind of engineering method which can shorten new product development cycles by replacing cost physical prototype with virtual digital model. Virtual prototyping technique, as method for active learning informatics support, requires the further refinement and also the enhancement of students' informatics skills, as well.

Keywords

active learning, virtual prototypes, practical projects

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  • Nicolae BOIAN

Management of Business' Development

https://doi.org/10.31926/RECENT.2019.58.048

Abstract

The present paper is a systematization of business' development management through the scientific modelling of the phenomenon. Strategic modelling in development management aims to evaluate investment plan in order to achieve a scientific justification in favour of the CEO's decision to trigger it or not. The main instrument of evaluation is the economic-financial diagnosis. The method used in diagnosis is the criterion type with the weighting of parameters according to their potential multiplier on the business development. Diagnosis development model contain domains, sub-domains, criteria and technical-economic indicators. The specific business development model has particularities as well the high determination of market, relationship, production and financial resources domains in evaluation. Also, the high significance of the business growth criteria in the internal resources' evaluation and of the financial balance criteria in attracting resources from external sources. The weighting of domains and sub-domains in evaluation is made according to the predominance of development need and available resources in the investment decision. The weighting of each criteria takes into account his contribution in meeting the development plan objectives. A significance score of criteria are calculated by multiplying the criterion status (Pi) with these two coefficients establishing a hierarchy of criteria in the development plan. Finally, the paper provides an interpretation of the criteria contribution to development, based on the calculated score. A case study is presented for how to apply the method.

Keywords

development, business, diagnosis, criterion, coefficient of importance, score

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  • Louisa AIT OUFFROUKH, Rachid CHAIB, Ion VERZEA

Study of the Conformity and Dimensioning of an Anti-Fire Network in a Hydrocarbon Depot

https://doi.org/10.31926/RECENT.2019.58.056

Abstract

In this work we present a novel approach to energy saving in buildings through the identification of the relevant parameters and the application of Soft Computing techniques to generate predictive models of energy consumption in buildings. To verify the feasibility of this proposal, we apply our approach to a reference building for which we have contextual data from a complete year of monitoring. First, we characterize the building in terms of its contextual features and energy consumption, and then select the most appropriate techniques to generate the most accurate model of our reference building charged with estimating the energy consumption, given a concrete set of inputs.

Keywords

big data, smart buildings, energy consumption, energy efficiency

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  • Horatiu BULEA

Mathematical Model Using Regression Functions for Determining the Expression of Surface Roughness at Plain Grinding with Diamond Wheels of Aluminum Oxide Ceramic (Al2O3)

https://doi.org/10.31926/RECENT.2019.58.064

Abstract

The aim of the work is to determine, through mathematical modeling using regression functions, the dependency expression between the surface roughness Ra at grinding with diamond wheels of aluminum oxide ceramic (Al2O3) for plain grinding with longitudinal advance, and the values of the grinding processing mode as Ra = f(Sl, t, Vd).

Keywords

aluminum oxide ceramic, roughness, mathematical modeling, regression functions

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  • Catrina CHIVU, Cătălin-Iulian CHIVU

Fuzzy vs PID Controller: Design Management

https://doi.org/10.31926/RECENT.2019.58.070

Abstract

Fuzzy logic was first time presented by L.A. Zadeh in 1972 as an alternative method of classical theory control by giving the opportunity to use a non-analytic method. During time, fuzzy logic was extensively applied in automotive, aerospace, business, electronic and even defence field, considering that is an easier way to obtain high performance. Automatic experts are constantly researching and proposing innovative and effective fuzzy control systems. The problem appears not in simulating the problem but integrating controller in an electric circuit. Therein lies the problem of the profitability of the fuzzy controller comparative to a classic PID control. Besides the time and knowledge requirements are quite different.

Keywords

robotics, gripper, fuzzy controller, PID

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  • Magdalena BARBU, Gavrilă CALEFARIU

Model of Monitoring and Correction of Tools Flow in a Production System

https://doi.org/10.31926/RECENT.2019.58.077

Abstract

Any factory, whatsoever the product it processes and whatsoever the type of material processing, is vulnerable to internal perturbations, among whom the variation of the tool flux is of major importance. The main issue of tool management within the production system consists in the fact that "at request, any tool, of any type and dimension, must be available within the right time, at the right place" to cast off the tool penury in the system. Preventing vulnerability is achieved through management in real time, which, for eliminating the penury and the surplus, must ensure the minimal safety stock, regulated through managerial decision.

Keywords

tool flow, perturbation evaluation, analysis of inputs / outputs

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  • Maria STOICANESCU

Considerations Regarding the Influence of the Gaseous Nitriding of the AISI1212 Steel on the Behaviour at Atmospheric Corrosion

https://doi.org/10.31926/RECENT.2019.58.082

Abstract

Given the wide field of use of the AISI1212 steel as well as the conditions required by its exploitation, we have considered a study to look at the possibilities of improving the mechanical properties and increasing the corrosion resistance up to the degradation factors of the metallic structure. This consisted in performing the thermochemical treatment of nitrating in a gas mixture, which has the effect of increasing surface hardness, long-term vibration resistance and obtaining an anti-corrosive protective layer. We aimed to obtain superior characteristics for it through the diffusion of nitrogen in the layer, in comparison with the classical heat treatment.

Keywords

diffusion process, superficial layer, microhardness, corrosion

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