Ghiţă Bârsan, Vasile Năstăsescu and Vlad-Andrei Bârsan
The paper is based on the experience gained in creating eLearning courses to keep the student’s interest high, to encourage them to study additional materials in order to achieve the level of complexity proposed by the discipline objectives. The combination of specific gaming-techniques with simulation elements has been combined into designing the e-learning content. The degree of motivation and the interest in the discipline were appreciated by comparing the results obtained by students attending a blending-learning to those students who did the didactic activities in the traditional way. At present, there is a decrease in students’ interest in technical subjects. On one hand, the complexity of these disciplines is high, and moreover, in order for the students to achieve the didactic objectives of the discipline, they must make a sustained effort and combine the individual study with the explanations in the classroom.
This paper presents some results of the author’s researching in connection with SPH (smoothed particle hydrodynamics) method and underwater explosion numerical modelling. All about cavitation fundamentals are considered known and about cavitation effects upon the structures. The authors, deeply preoccupied in using of SPH method, as well in modelling of the underwater explosion effects upon structures, had to take into consideration the bulk cavitation. A main issue in this study was the knowing of the bulk cavitation domain and its characteristic parameters. Such researching was possible to be successfully carried out, only by using of the SPH method. Finally, the paper presents the relations and the working way for knowing of the bulk cavitation domain and also a numerical model using SPH method is presented. The numerical example regarding shape and dimensions of the bulk cavitation is presented together putting in evidence of some parameters which can make damages upon a structure that is in the bulk cavitation area.
The reason for building a website is primarily to reach target audiences worldwide (or local audiences, as appropriate) and, secondly, to represent a company or organization in the online environment. And if we take the second case, namely online representation is necessary to make sure that website is always updated and that has an improved web design. Trends in web design can have multiple roles: to make a website more attractive and more functional and to increase its traffic and subsequent conversions. Given the evolution of technology, most websites have to suffer some changes so frequent visitors to enjoy right experiences regardless of how they access, so for companies that take seriously the importance of their online website, respecting future trends in the online space is the only way to start a new project. This article brings up some trends in web design, considering this issue of great interest in the online environment. Although it is quite difficult to predict which trends will later develop into the necessity, we must keep pace in this digital world where everything seems to change so fast.
The knowledge based organization is the organization in which production and consumption of knowledge is the most important type of activity, knowledge is recognized as a key resource, information and communication technologies are core technologies and information environment, together with the social and the ecological ones, constitute the human existence. The information society allows broad access to information for its members, becoming a new way of working and knowledge. The new digital technologies essential reduce the cost of access, storage and transmission of information. IT systems play an important role in processes that speed up the exchange of information within the organization and between organizations and in effective dissemination of information to the consumer or, if we are talking in the context of education, student. In this context, where there is an ongoing need for education and training, the Web has become a new medium for publishing the information. So, websites are used to promote businesses and products, provide services and information, and facilitate communication. For medium and large sites, the question of their content management occurs. Therefore content management systems have been implemented (CMS). The system inputs are information to be published, and the outputs are the pages that will be seen by visitors. Content management is the systematic and structured supply, creation, processing, management, presentation, publishing and content reuse. There is a wide range of CMS, but no solution is able to manage all types of content. Referring this in the field of education and learning, the article aims to analyze the types of CMS systems consistent with known theories and models of learning: behaviorism, cognitivism, constructivism & connectivism.
Vasile Năstăsescu, Ghiță Bârsan and Silvia Marzavan
This paper presents some authors’ results regarding numerical modelling of the acoustic wave propagation, using the Ansys program. The acoustic wave propagation is studied under conditions of existence of acoustic absorbing panels. Different materials are taken into account (aluminium, foam, oak, polystyrene) for considered acoustic absorbing panels. Also, different dimensions and different cases for fixing the panels were considered. The acoustic wave propagation was studied in stationary conditions and in dynamic conditions at different values of sound frequencies. A comparative analysis is performed regarding the influence of different conditions upon acoustic wave propagation. Our studies presented in this paper are referring to the acoustic propagation in an open space, like on airports or around the acoustic sources placed in open space. The aim of this paper is to offer our experience in this field for a numerical analysis of the ways for sound level reduction. Also the facilities of the Ansys program for the solving of such problems are presented in a practical manner of use.
Nicolae Iliescu, Vasile Nastasescu and Ghiță Barsan
In the first part of the paper, using the numerical simulations with FEM and the results of some investigations made with different experimental techniques, a calculation methodology was developed for the study of the stress waves propagation in the short tronconical bars subjected at axial impact. Because a good agreement between data obtained from numerical analysis and experimental investigations was observed, the numerical model of calculus conceived for this study was considered validated. The calculus model established was used to investigate other aspects connected of stress wave propagation in the short tronconical bars. In the second part of the paper, using established calculus model and numerical analysis with Finite Element Method the influence of bar conicity on stress wave propagation and on stress distribution in different cross sections of the bar was analyzed
Marin Lupoae, Ghiţă Bârsan, Daniel Constantin and Dan Buliga
The paper presents some aspects regarding the response of a protective structure under the impact produced by an aerial bomb. The top slab of the protective structure is composed by three layers of different materials: rigid layer made of concrete, elastic layer made by a powdered material (clay, sand etc.) and structural layer made of concrete. The theoretical, although useful, it has not captured all the details regarding the behaviour of a layered slab under such loadings. The paper addresses in terms of numerically study the influence of different parameters of the layers (thickness, material and layout) and weapons of destruction (speed and angle of inclination of the projectile) on the maximum deformation of the base layer of the layered slab.
The foam materials, by construction and by characteristic properties (low density, large deformations, great flexibility, Poisson ratio practically zero etc.), are widely used in many and various domains. The numerical simulation of the foam material behavior raises some difficulties, which can be impassable under certain circumstances. This paper presents some of our researching results in numerical modeling of foam materials, which can be very useful for those interested in numerical modeling of the foam materials. Numerical modeling used by the authors is based on the finite element method (FEM) and on the element-free Galerkin (EFG) method. The results are presented in a comparatively way and they also present how some usually running errors can be avoided. The conclusions and the results are considered by the authors very useful in modeling of the foam materials and in choosing of the most fitted method too.
In the military system, the simulation represents the most important tool to support training because it can be efficiently used from the tactical level up to the strategic level. For individual training the costs of using real or virtual simulation systems are not justified, but when it comes to the headquarters training, running a live exercise is extremely expensive. Nevertheless, the units, headquarters, general staff and Multinational Division South-East Headquarters need to be trained in both national and NATO exercises. Taking those facts into consideration, computer assisted exercises proved to be the best solution for training all the cycles within a headquarters that support the decision making process. In the last years, among all those processes, a particular interest was shown for the functional area services interoperability during NATO computer assisted exercises.
Currently, social engineering attacks are increasingly sophisticated and the main factor that can influence the success of these techniques is the employee. Awareness of these types of attacks through permanent information sessions can be a good practice for any organization. In this work, besides the approach to the development of eLearning content accessible to employees, there are presented some methods and tools that can be used to avoid the theft of sensitive information or the infection of hosts on the network.