Mate Hegyhati

Mate Hegyhati
Széchenyi István University, Gyor · Department of Information Technology

13.43
 · 
Doctor of Philosophy

About

17
Publications
660
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69
Citations

Publications

Publications (17)
Article
Full-text available
In this paper a new scheduling problem is presented, which originates from the steel processing industry. The optimal scheduling of a steel forge is investigated with the goal of minimizing setup and storage costs under strict deadlines and special resource constraints. The main distinctive feature of the problem is the deterioration of some equipm...
Article
Full-text available
Nowadays the successful operation of a company is unimaginable without fast and reliable communication. As a result, so-called Communication Service Providers play an important role in today’s business life. Their orders have to be carried out promptly and dependably, let them be requests for new installations, modifications, or maintenance tasks....
Conference Paper
Papers dealing with optimization problems in public transportation usually follow the same methodology. The problem is modeled in a classical mathematical way, and then either solved directly using mathematical programming methods, or by the application of combinatorial heuristics. Even if this process yields an optimal solution, it might prove com...
Article
Full-text available
Semiconductor manufacturing has recently attracted an increased attention in process optimization research. Various MILP and constraint programming methods were published to solve the scheduling problem arising in the wet-etching systems. In the present work, improvements are given to these state-of-the-art models, furthermore, the general purpose...
Article
We solve a long-standing open problem concerning a discrete mathematical model, which has various applications in computer science and several other fields, including frequency assignment and many other problems on resource allocation. A mixed hypergraph $\mathcal H $ is a triple $(X,\mathcal C ,\mathcal D )$ , where $X$ is the set of vertice...
Conference Paper
Full-text available
The main activities in Waste to Energy processing include waste generation, collection, separation, transportation, conversion, energy distribution, and ultimate waste disposal. Waste to Energy carries a trade-off between energy generation and the energy spent on collection, transport and treatment. Major performance indicators are cost, Waste Ener...
Conference Paper
The efficient management of renewables to reduce utilisation of energy sources with high impact on the environment (e.g. fossil fuels) is a widely studied research topic. The core of the complexity for this kind of planning and operational problems is the variety and variation on both the supply and demand side. In a typical case study both high an...
Conference Paper
Heat integration of continuous processes is a widely studied research area, where many approaches have been developed to minimize cold and hot utility usage. Batch processes require additional consideration for the planning of the heat exchanger network: since the flows are not always present in the system, their timing has to be considered as well...
Article
Makespan minimization or throughput maximization, the most common objectives in batch process scheduling are related to economical aspects; energy consumption or sustainability are not directly taken into account (Mendez et al., 2006; Hegyhati and Friedler, 2010). Some of the published methods consider utility cost (Adonyi et al., 2003) or wastewat...
Article
Methods for solving batch process scheduling problems have gone through a vast development in the last 2 decades. Most of the published approaches are based on a mixed integer programming formulation. Since the difficulty of scheduling is originated from its combinatorial nature, graphs and combinatorial algorithms are more adequate to represent an...
Conference Paper
Large number of papers has been published in the field of industrial batch process scheduling providing various approaches to support operation level decision making. Detailed reviews of the available methods are given by Floudas and Lin (2004), Mendez et. al (2006), and Hegyhati and Friedler (2010). One of the key parameters for batch scheduling p...
Article
Full-text available
Processes and markets uncertainties make batch plants a complex environment to manage production activities. Uncertainties may cause deviations and infeasibilities in predefined schedules; this may result in poor planning and inefficient utilization of materials. Consequently, the relevance of explicitly incorporating variability in the scheduling...
Article
Full-text available
The operation of a production facility has a major effect on the efficiency; therefore it is of upmost importance to find the best possible schedule. Due to the high practical expediency, the topic of batch process scheduling has gained growing interest in the last two decades and many approaches have been published to solve a wide variety of sched...
Article
Multipurpose batch processes entail various operational policies that have been widely investigated in published literature. In this paper, no-intermediate-storage (NIS), zero-wait (ZW) and common-intermediate-storage (CIS) operational policies are of particular interest. In all these policies, no dedicated storage facility is available between two...
Article
This paper presents a graph-theoretic technique for scheduling of multipurpose batch processes with the objective of maximizing throughput over a fixed time horizon. The presented technique is based on the S-graph framework which embeds the necessary scheduling information pertaining to recipes of different batches and possible resource allocation....

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