Search in Publications

Found 6278 publications

Developing fuzzy cognitive maps for modeling regional waste management systems

No authors available

Publication Name: Civil-Comp Proceedings

Publication Date: 2009-01-01

Volume: 92

Issue:

Page Range: Unknown

Description:

Sustainable waste management systems necessarily include environmental, economic, social, institutional, legal and technical aspects. As a result of the incompleteness and multiple uncertainties occurring in sustainable waste management systems, we propose the use of fuzzy cognitive maps (FCM) to support the planning and decision making process. It is obvious that uncertainties involved with waste management represent vagueness rather than probability. Fuzzy sets and fuzzy logic are suitable to construct a formal description and a mathematically manageable model of systems and processes with such uncertainties. In the research described in this paper the FCM model of the Gyor RWMS is established and implemented in such a structure that its parameters and weights were flexibly variable. By observation of the model and its time dependent behaviour we determined under what conditions the long-term sustainability of a regional waste management system could be ensured. In this paper, the interpretation of the results obtained by the FCM model for the actual waste management system are presented. © Civil-Comp Press, 2013.

Open Access: No

DOI: DOI not available

Production process modeling and planning wih simulation method, mounting process optimisation

No authors available

Publication Name: International Workshop on Modeling and Applied Simulation, MAS 2009, Held at the International Mediterranean and Latin American Modeling Multiconference, I3M 2009

Publication Date: 2009-01-01

Volume:

Issue:

Page Range: 240-245

Description:

The paper focuses on the establishment of the production program using simulation technology in a structure, where several products and high amount of variants per product are produced. The topic of the paper addresses the discrete event simulation technology which is used to model the material flow and the manufacturing processes in the production area. This paper would like to show and describe the modelling steps of a complex production system with a lot of products and three different line parts, which are connected with buffers.

Open Access: No

DOI: DOI not available

Teamwork in higher education: Teamwork as chance of success

Bencsik Andrea I. Marosi

Publication Name: International Journal of Learning

Publication Date: 2009-01-01

Volume: 16

Issue: 5

Page Range: 167-174

Description:

Education, economy and labour market bear important relationships. The ever faster changes and more important preservation of competitiveness force higher educational institutions and economic players to cooperate more effectively. According to their educational, scientific, knowledge-maker and generative characteristics, universities and colleges receive and play a more active role in the development of the economy. Besides the expansion and multitude of higher education these also contribute to the changes in higher educational roles. In this study, which was conducted among higher educational lecturers, first of all we were looking for the answer whether there is a turn to receive practical experience during daily educational system or in the operation of institutions. Continuing this, in our target groups we intended to find out whether there is change in relationships among lecturers themselves, lecturers and their students, lecturers and economic players. We also wanted to find out if there is any possibilities to work in a team and whether we can find any sign of expectations defined by lecturers and employers of the labour market. Is there any improvement in the way of preparation for living up requirements, such as project-work, language - and entrepreneur abilities? What kind of attitude can be recognized in the theoretical, practical and educational methods? © Common Ground, Ildiko Marosi, Andrea Bencsik, All Rights Reserved, Permissions.

Open Access: Yes

DOI: 10.18848/1447-9494/CGP/v16i05/46260

Small and silly? or private pitfall of small and medium-sized enterprises

No authors available

Publication Name: World Academy of Science, Engineering and Technology

Publication Date: 2009-01-01

Volume: 37

Issue:

Page Range: 482-488

Description:

Knowledge and these notions have become more and more important and we speak about a knowledge based society today. A lot of small and big companies have reacted upon these new challenges. But there is a deep abyss about knowledge conception and practice between the professional researchers and company -life. The question of this research was: How can small and mediumsized companies be equal to the demands of new economy? Questionnaires were used in this research and a special segment of the native knowledge based on economy was focused on. Researchers would have liked to know what the sources of success are and how they can be in connection with questions of knowledge acquisition, knowledge transfer, knowledge utilization in small and medium-sized companies. These companies know that they have to change their behaviour and thinking, but they are not on the suitable level that they can compete with bigger or multinational companies. © 2009 WASET.ORG.

Open Access: No

DOI: DOI not available

Measurement and simulation of vector hysteresis characteristics

Miklós Kuczmann

Publication Name: IEEE Transactions on Magnetics

Publication Date: 2009-01-01

Volume: 45

Issue: 11

Page Range: 5188-5191

Description:

This paper presents a Preisach model of ferromagnetic hysteresis to simulate the vector hysteresis properties of ferromagnetic materials. Vector behavior has been studied using a single sheet tester with a round shaped specimen at low frequency, and the magnetic flux density vector has been controlled by a digital measurement system. Circular magnetic flux density pattern has been measured. An inverse vector Preisach hysteresis model has been developed and identified by applying the measured data. Finally, the inverse model has been inserted into a finite element procedure through the fixed point technique and the reduced magnetic scalar potential formulation. The applicability of the measurement system as well as the developed model has been proven by comparing measured and simulated results. © 2009 IEEE.

Open Access: Yes

DOI: 10.1109/TMAG.2009.2031072

Introduction of simulation method and possibilities of standardisation

No authors available

Publication Name: International Workshop on Modeling and Applied Simulation, MAS 2009, Held at the International Mediterranean and Latin American Modeling Multiconference, I3M 2009

Publication Date: 2009-01-01

Volume:

Issue:

Page Range: 224-231

Description:

The paper focuses on the applicability of simulation technology in several hierarchical levels of a production oriented industrial firm. The topic of the paper addresses the discrete event simulation technology which is used to model the material flow and the manufacturing processes in the company. This paper would like to show some practice experience about the industrial introduction steps of manufacturing simulation, as well as our recent research result in the field of standardized simulation model building and data handling procedure.

Open Access: No

DOI: DOI not available

Developing fuzzy cognitive maps for modeling regional waste management systems

Claudiu Pozna Adrienn Buruzs László T. Kóczy

Publication Name: Civil Comp Proceedings

Publication Date: 2009-01-01

Volume: 92

Issue: Unknown

Page Range: Unknown

Description:

Sustainable waste management systems necessarily include environmental, economic, social, institutional, legal and technical aspects. As a result of the incompleteness and multiple uncertainties occurring in sustainable waste management systems, we propose the use of fuzzy cognitive maps (FCM) to support the planning and decision making process. It is obvious that uncertainties involved with waste management represent vagueness rather than probability. Fuzzy sets and fuzzy logic are suitable to construct a formal description and a mathematically manageable model of systems and processes with such uncertainties. In the research described in this paper the FCM model of the Gyor RWMS is established and implemented in such a structure that its parameters and weights were flexibly variable. By observation of the model and its time dependent behaviour we determined under what conditions the long-term sustainability of a regional waste management system could be ensured. In this paper, the interpretation of the results obtained by the FCM model for the actual waste management system are presented. © Civil-Comp Press, 2013.

Open Access: Yes

DOI: DOI not available

Small and silly? or private pitfall of small and medium-sized enterprises

Bencsik Andrea I. Marosi V. Lore

Publication Name: World Academy of Science Engineering and Technology

Publication Date: 2009-01-01

Volume: 37

Issue: Unknown

Page Range: 482-488

Description:

Knowledge and these notions have become more and more important and we speak about a knowledge based society today. A lot of small and big companies have reacted upon these new challenges. But there is a deep abyss about knowledge conception and practice between the professional researchers and company -life. The question of this research was: How can small and mediumsized companies be equal to the demands of new economy? Questionnaires were used in this research and a special segment of the native knowledge based on economy was focused on. Researchers would have liked to know what the sources of success are and how they can be in connection with questions of knowledge acquisition, knowledge transfer, knowledge utilization in small and medium-sized companies. These companies know that they have to change their behaviour and thinking, but they are not on the suitable level that they can compete with bigger or multinational companies. © 2009 WASET.ORG.

Open Access: Yes

DOI: DOI not available

Several meshless solution techniques for the stokes flow equations

Csaba Gáspár

Publication Name: Computational Methods in Applied Sciences

Publication Date: 2009-01-01

Volume: 11

Issue: Unknown

Page Range: 141-158

Description:

The permanent 2D Stokes flow is considered. The applied solution technique is the classical pressure correction method, which converts the original problem to a sequence of Poisson equations. These Poisson equations are discretized and solved in a meshless way, using local interpolation based on radial basis functions. Further improvement can be achieved by using a direct multi-elliptic approach instead of local interpolation, which results in re-globalized, quadtree-based schemes. The number of unknowns can be reduced by applying the method of fundamental solutions. A special regularization technique is introduced which uses higher order fundamental solutions without singularities. This regularization is combined with the direct multi-elliptic interpolation, which significantly reduces the computational cost and makes it possible to avoid the use of dense and ill-conditioned matrices.

Open Access: Yes

DOI: 10.1007/978-1-4020-8821-6_9