Tamás Hartványi

14631983000

Publications - 11

Storage Location Assignment in Indirect-Access Storage Systems

Tamás Hartványi Zoltan Andras Nagy Miklós Szabó

Publication Name: Lecture Notes in Logistics

Publication Date: 2024-01-01

Volume: Part F3450

Issue: Unknown

Page Range: 172-185

Description:

A common solution in warehouses is to provide direct access to products due to various service policies. The construction of such warehouses is quite expensive due to the extensive service roads required, but at the same time, in accordance with the Pareto principle, most of the variety of materials does not justify the provision of direct access. We believe that similar dynamics could be achieved on a smaller area with the right operation of an indirect access storage system, as if direct access were provided to all stored units. Meanwhile, the high variety of products and the low accessibility make it a challenge in selecting and implementing the right operation method. The efficiency is influenced by the layout of the warehouse, the assignment of stored units to storage locations, and the operating processes. We conducted simulations to examine these; the results will be presented here. The design of the warehouse and the stochastic material flow was not changed during the examinations; the initial arrangements of the stored materials and the procedures for their movement were built according to several aspects. This revealed how these factors affect efficiency, the computational capacity needed, and the mutual influence they exert.

Open Access: Yes

DOI: 10.1007/978-3-031-70977-7_10

NFC applications in the tracking systems

Tamás Hartványi Csaba I. Hencz

Publication Name: International Conference on Industrial Logistics Icil 2014 Conference Proceedings

Publication Date: 2014-01-01

Volume: Unknown

Issue: Unknown

Page Range: 135-142

Description:

Radio Frequency Identification (RFID) and a Near Field Communication (NFC) is an automatic identification method, relying on storing and remotely retrieving data using devices different devices. An RFID tag and NFC devices is a small object that contains an antenna that enables it to receive and respond to radio-frequency. Basic requirements that these devices have to work in any conditions. In the working environment (closed or open air) there are always objects which can interact with radio frequency. This technical problem is to be considered when it comes to implementation of RFID or NFC devices knowing that materials can reflect, absorb or detune radio waves. In our paper we describe a system where NFC is applied. Many economic and technological questions arise by the implementation and usage. Copyright © FSB, Zagreb, Croatia, 2014.

Open Access: Yes

DOI: DOI not available

Development of production logistics system based on lean principles

Tamás Hartványi Csaba I. Hencz

Publication Name: International Conference on Industrial Logistics Icil 2012 Conference Proceedings

Publication Date: 2012-01-01

Volume: Unknown

Issue: Unknown

Page Range: 349-355

Description:

This paper acquaints the production logistics system about a Hungarian operating vehicle part manufacturing company, including its examination, and development opportunities. This paper's highlighted objectives are the preparation and analysis of the basic data of development recommendation. Moreover, it demonstrates lean based outsourcing strategies which could significantly reduce the company's handling demands.

Open Access: Yes

DOI: DOI not available

Transportation network realization with an optimization method

Tamás Hartványi András Bakó István Szuts

Publication Name: Isciii 09 4th International Symposium on Computational Intelligence and Intelligent Informatics Proceedings

Publication Date: 2009-12-28

Volume: Unknown

Issue: Unknown

Page Range: 81-84

Description:

In connection with the network realization problem the main questions of the algorithm are which edges to choose and what is the budget consequence of that. These problems can be solved by exact optimization methods, but in this case the number of computational steps (additions and comparisons) is an exponential function of the number of nodes. For this reason usually heuristic methods are chosen for solving these problems. Some special problems can be formulated as maximal flow problems. To get the solution we use only maximal flow and shortest route algorithms. Thus we decrease the number of computations, but the size of the network will grow. In this paper we describe this algorithm to solve the network realization problem. Then we give a transportation network realization problem and show how to solve this problem by the some algorithms. © 2009 IEEE.

Open Access: Yes

DOI: 10.1109/ISCIII.2009.5342277

Special network algorithms with gains

Tamás Hartványi András Bakó István Szuts

Publication Name: Proceedings 2009 International Conference on Intelligent Engineering Systems Ines 2009

Publication Date: 2009-11-02

Volume: Unknown

Issue: Unknown

Page Range: 155-158

Description:

Several optimalization algorithms have been proposed for the solution the minimal and the multiterminal minimal path of a network having cost (distance) function. In this paper we present these algorithms in a special network in which on the edges a gain function is given. On the edge (x,y) of the network a t(x,y) transportation cost is defined. In the course of the transportation on the edge (x,y) the goods loose a part of there weight. If one unit of goods is transported from point x to point y then k(x,y) unite of goods arrive at point y, where 0

Open Access: Yes

DOI: 10.1109/INES.2009.4924754

An optimal quality management algorithm for road maintenance

K. Ambrus-Somogyi Tamás Hartványi Habil A. Bako

Publication Name: 12th International Conference on Intelligent Engineering Systems Proceedings Ines 2008

Publication Date: 2008-09-02

Volume: Unknown

Issue: Unknown

Page Range: 233-236

Description:

The Road Management Systems (and the Pavement Management System-PMS) usually do not take into consideration the changes of future traffic. The maintenance and rehabilitation actions and the development of the road network structure as well as the changing traffic structure modify the amount of the traffic on the road sections. The deterioration process depends on mostly the volume of the traffic. That is why it is important to take into consideration the change of the traffic volume during the planning time horizon. In this paper some techniques are shown which are capable of handling this problem: in the multiperiod, long time model at each planning period the traffic volume change is take into consideration; in the ranking models the problem can also be handled and solved; in the case of the one-period Markov stable model to finding the solution is straightforward. In the multiperiod model a stepwise optimization procedure is used instead of the original algorithm. The objective function is also modified, so that the sum of the differences of the actual solution and the Markov stable model solution is minimized. The result of this algorithm provides a better quality of the road network. The amount of traffic on the sectors depends on the development of the road network also. © 2008 IEEE.

Open Access: Yes

DOI: 10.1109/INES.2008.4481300

RFId applications in the supply chain

Tamás Hartványi József Marek

Publication Name: 2007 1st Annual Rfid Eurasia

Publication Date: 2007-12-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

It is a fact that Radio Frequency Identification technology (RFId) can benefit enterprises and contribute to their integration to supply chains. Several issues emerge concerning technology and economy of introducing and applying the system, especially in small and medium sized businesses. In 2005 Department of Logistics and Forwarding of Széchenyi István University joined the program INTERREG IIIC "REGINSrfld" initiated by the Community of the European Union. The purpose of the program is to examine possibilities of introducing of RFId in small and medium-sized businesses. We completed the project in cooperation with German, Austrian and Italian partners in June 2006.

Open Access: Yes

DOI: 10.1109/RFIDEURASIA.2007.4368132

Adopting RFID in supply chains

Tamás Hartványi Lajos Tóth P. Németh

Publication Name: 2006 IEEE International Conference on Mechatronics Icm

Publication Date: 2006-12-01

Volume: Unknown

Issue: Unknown

Page Range: 263-266

Description:

Within the framework Interreg IIIC REGINS (Regional standardized Interfaces for a better integration of regional SMEs in the European Economy - http://www.regins.org) the Department of Logistics and Forwarding at the Széchenyi István University in Gyor, Hungary started a project with the title "Promotion of RFId (Radio Frequency Identification)". The project started in June 2005, and ended in May 2006. Our partners are situated in Upper Austria, Stuttgart Region, and Lombardy Region. Our project screens the state of the art and the ongoing development of RFId technology and processes. Special focus is on the needs of SMEs. This paper is the first in a series of publications regarding this topic, screening the state-of-the-art of RFId systems and the challanges and possibilities of the introduction to various supply chains. © 2006 IEEE.

Open Access: Yes

DOI: 10.1109/ICMECH.2006.252535

Applying intelligent methods in logistics control

Tamás Hartványi Lajos Tóth László T. Kóczy

Publication Name: Iccc 2005 IEEE 3rd International Conference on Computational Cybernetics Proceedings

Publication Date: 2005-12-01

Volume: 2005

Issue: Unknown

Page Range: 71-74

Description:

The purpose of this research and development project is to construct the foundations of a logistics IT center with a universal and intermodal character, i.e., covering all modes of transportation and corresponding central functions related to warehouses and container terminals. Through its modular structure it is applicable to arbitrary concrete site dependent needs. It also contains intelligent elements, which offer suboptimal solutions to certain classic mathematical optimization problems connected to logistics, acceptable from a practical point of view and tractable in the computer science sense. In order to realize and implement this system, several basic research tasks both in logistics and IT will be solved. A model for a logistics center will be constructed, suitable for present infrastructural situation in Central and Eastern Europe but compatible with European Union standards.

Open Access: Yes

DOI: 10.1109/ICCCYB.2005.1511551

Evaluation of Indirect Storage Location Systems by Fuzzy Signature

Tamás Hartványi Zoltan Andras Nagy Miklós Szabó

Publication Name: Chemical Engineering Transactions

Publication Date: 2025-01-01

Volume: 121

Issue: Unknown

Page Range: 115-120

Description:

Traditional storage systems often rely on direct access storage locations, but these solutions can be inefficient and environmentally exhausting due to higher energy consumption and limited scalability. In previous studies, we demonstrated that higher efficiency could be achieved with indirectly-accessible storage systems compared to fully directly accessible ones. To compare the different layouts, we developed a simulation model through which warehouse operations were executed. The resulting time values became comparable, allowing us to rank the solutions. However, the conventional method of calculating simple averages, often applied in the evaluation of logistic performance, has limited capacity to capture the complexity of data distributions and the small differences between individual observations. The aim of this study is to interpret warehouse operations from a new perspective using a fuzzy logic-based model, explicitly addressing the research gap that traditional statistical averages cannot adequately capture subtle performance differences. The novelty of our contribution lies in applying fuzzy signatures to warehouse simulation, which enables more precise differentiation between competing system layouts. During the simulation analysis, traditional average values are compared using a classification method based on fuzzy sets, demonstrating that this new approach is more sensitive to performance fluctuations and better reflects real operational conditions. This approach supports the selection of the most suitable storage system for warehouse operations, the initial placement of products, or the operational process that best aligns with emerging demands, enabling greater energy savings and enhancing the overall sustainability of the system.

Open Access: Yes

DOI: 10.3303/CET25121020

How to Create Organizational Resilience and Adaptability Through Embedded Plasticity-Rigidity Cycles

Tamás Hartványi István Fekete

Publication Name: Chemical Engineering Transactions

Publication Date: 2025-01-01

Volume: 121

Issue: Unknown

Page Range: 13-18

Description:

This paper explores how organizational network structures influence cascading failure propagation and how embedded plasticity–rigidity cycles can create resilience and adaptability. Using real industrial examples from IT-telecom manufacturing, the study demonstrates how small disturbances in highly connected, overly lean (anorexic) supply chains can escalate into large-scale cascading failures, leading to “bulimia states” characterized by simultaneous excesses and shortages. The research introduces the concept of embedded plasticity – the deliberate integration of adaptable nodes and teams at multiple organizational levels – to dissipate disruptions and maintain performance stability. By analyzing typical network motifs such as bi-fans and bi-parallels, the authors identify the structural sources of ambiguity and competition that amplify systemic fragility. The framework includes the design of dual plastic-rigid team structures that align internal dynamics with external fluctuation patterns. These embedded plasticity cycles enable swift adaptation without compromising process quality or productivity. Appropriate levels of plasticity, strategically distributed across organizational sub-networks, are key to ensuring the robustness, flexibility, and continuous learning of complex, interconnected care systems.

Open Access: Yes

DOI: 10.3303/CET25121003