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Publications - 6289

A population based metaheuristic for traveling salesman type problems

Peter Foldesi Boldizsar Tuu-Szabo László T. Kóczy

Publication Name: 2017 International Conference on Fuzzy Theory and Its Applications Ifuzzy 2017

Publication Date: 2017-03-09

Volume: 2017-November

Issue: Unknown

Page Range: 1-5

Description:

In this paper we present a metaheuristic method, called DBMEA. It combines the bacterial evolutionary algorithm with local search techniques. Based on our test results it can be used for solving efficiently more discrete optimization problems. The algorithm was tested on Traveling Salesman Problem and Traveling Repairman Problem (TRP) benchmark instances found in the literature. In the case of TSP the DBMEA algorithm produced optimal or near-optimal solutions for all tested instances. Although the most efficient TSP solver method, the Helsgaun's Lin-Kernighan heuristic was faster than DBMEA, but in the case of DBMEA the runtime was more predictable than it the case of other methods. In the case of TRP the results are competitive in terms of accuracy and runtimes with the state-of-the art methods. Except two instances our algorithm found the best-known solutions, and for the biggest tested instance it found new best solution. The runtime was on average 30% faster than the most efficient heuristic in the literature.

Open Access: Yes

DOI: 10.1109/iFUZZY.2017.8311797

Functional and environmental impacts of the use of reclaimed asphalt pavement materials and of foamed asphalt

A. Saleh László Gáspár

Publication Name: Acta Technica Jaurinensis

Publication Date: 2021-05-26

Volume: 14

Issue: 2

Page Range: 212-227

Description:

Environmental safety related to asphalt mixing plants has been a growing concern due to the high temperature of asphalt mixture production resulting in a lot of energy used and much air pollutants released. Asphalt mixtures with foamed bitumen and RAP can reduce this problem. This paper deals with their functional and environmental effects. In the paper, it was introduced that the hot mix asphalt mixtures bound by foamed bitumen and containing RAP materials provides a good workability, in comparison to “traditional” hot mix asphalt mixtures. However, producing foamed bitumen needs special technological steps before using it as asphalt binder. The use of RAP materials reduces environmental harm and construction costs, besides it preserves the limited resources of stone, sand and gravel.

Open Access: Yes

DOI: 10.14513/actatechjaur.00590

Optimizing Foamed Bitumen Bound Asphalt Mixture Design Using Neural Network

A. Saleh László Gáspár

Publication Name: Periodica Polytechnica Civil Engineering

Publication Date: 2024-09-20

Volume: 68

Issue: 4

Page Range: 1040-1051

Description:

Effective design of bituminous mixes for road pavements requires a robust understanding of their mechanical properties to ensure durability and safety. Conventional experimental methods for assessing these properties are time-consuming and costly. To address this challenge, advanced machine learning techniques have gained prominence in predicting bituminous mix behaviour. In this study, we focus on predicting Marshall Stability (MS) and Flow (MF) of foamed bitumen bound asphalt pavements using essential input parameters: Temperature, Foam Content, Expansion Ratio, and Half-Life. Leveraging a neural network model, accurate prediction equations and surface analyses were developed for optimizing pavement design. Furthermore, integration equations are also introduced to enhance the accuracy of the methodology. Sensitivity and Parametric Analyses provide insights into parameter impacts, and R-squared measures model goodness of fit. The research work presented not only streamlines pavement design but also advances the understanding of intricate input-output relationships in bituminous mixtures.

Open Access: Yes

DOI: 10.3311/PPci.23898

The value of routine second-look endoscopy in the management of the acute gastroduodenal ulcer bleeding

Tibor Kárász Márta Jánoki Hussam Saleh Istvan Racz Nora Dancs Katalin Szocs Andrea Szabó Zoltán Horváth Mihaly Csöndes

Publication Name: Orvosi Hetilap

Publication Date: 2009-10-01

Volume: 150

Issue: 42

Page Range: 1932-1936

Description:

The role of routine second-look endoscopy in the management of patients with acute peptic ulcer bleeding is controversial. A more precise identification of higher risk patient group, based on both clinical and endoscopic criteria, is needed to determine whether there are high-risk patients who may benefit from this management strategy. Aim: Or aim was to find out whether scheduled second-look endoscopy has any beneficial effect in the clinical outcome. Methods: Both endoscopic and clinical data were analyzed in 274 acute gastroduodenal ulcer bleeding patients. The need for repeated endoscopic haemostatic intervention was used as a measure to evaluate the potential beneficial effect of the second look endoscopy. Patients were categorized according to the Forrest classification detected during the emergency endoscopy. Results: In the subgroup of actively bleeding patients (Forrest Ia, Ib) a second endoscopic haemostasis was performed in 23.8% of cases. In the patient subgroup with visible vessel ulcers (Forrest IIa) and in those with adherent clot covered ulcers (Forrest IIb) the needs for a repeated haemostasis were 13.0% and 13.3% respectively. Despite the not statistically significant differences, remarkable clinical impact was noted favoring scheduled second look endoscopy in patients with initially active ulcer bleeding. Conclusion: In the light of the retrospective study results it may be concluded that the scheduled second look endoscopy strategy offers a beneficial clinical outcome for selected patients estimated to be a very high risk of re-bleeding following the initial endoscopic therapy for active bleeding.

Open Access: Yes

DOI: 10.1556/OH.2009.28725

In-store marketing: a strategic perspective

James E. Richard Yongqiang li Bill Merrilees László Józsa Kim Shyan Fam Jayne Krisjanous Nelson Oly Ndubisi

Publication Name: Asia Pacific Journal of Marketing and Logistics

Publication Date: 2011-03-29

Volume: 23

Issue: 2

Page Range: 165-176

Description:

Purpose – The purpose of this paper is to examine two key dimensions of instore marketing, namely instore promotions and price markdowns. These seem to be the two most important aspects of instore marketing, though other dimensions such as retail personal service are also worthy of study. Design/methodology/approach – A sample of 287 New Zealand clothing and shoe retailers was studied. Survey questions included the perceived importance of instore promotions and price markdowns. The aim was to explain these perceptions in terms of marketing strategies, threat of competition and environmental uncertainty. Findings – The results indicate that a discount marketing strategy, environmental uncertainty and emphasis on pricepromotions are key to explaining retailers' perceptions and use of specific instore marketing activities. In addition, seven key marketing activities were found to distinguish high and lowperformance retailers with respect to instore promotions. Practical implications – The study has highlighted strategic aspects of instore marketing, by focusing on two key components of instore marketing, namely instore promotion and price markdowns. The findings should provide much needed advice to retailers on the use of sales promotion tools in different environmental settings. Originality/value – This paper should prove valuable to academic researchers and retailing managers (particularly to those in smaller countries), owneroperated retail outlets, and chain stores. © 2011, Emerald Group Publishing Limited

Open Access: Yes

DOI: 10.1108/13555851111120470

Robust scheduling of waste wood processing plants with uncertain delivery sources and quality

Máté Hegyháti Balazs David Olivér Osz

Publication Name: Sustainability Switzerland

Publication Date: 2021-05-01

Volume: 13

Issue: 9

Page Range: Unknown

Description:

While the study of reverse wood value chains has become an important topic recently, optimization-focused studies usually consider network-level problems and decisions, and do not address the individual processes in the network. In the case of waste wood, one such important process is the scheduling of the various machines in a waste wood processing facility to treat incoming wood deliveries with multiple sources and varying quality. This paper proposes a robust multi-objective mixed-integer linear programming model for the optimization of this process that considers the uncertain origins and compositions of the incoming deliveries, while aiming to minimize both lateness and energy consumption. An exhaustive study is performed on instance sets of different sizes and structures to show the efficiency and the limits of the proposed model both in single-and multi-objective cases.

Open Access: Yes

DOI: 10.3390/su13095007

Quantitative comparative analysis on the cultural tourism-financial potential of creative cities (on the example of Debrecen, Győr and Veszprém)

Szabolcs Morvay Dávid Fekete

Publication Name: Teruleti Statisztika

Publication Date: 2020-01-01

Volume: 60

Issue: 5

Page Range: 548-566

Description:

The European Capital of Culture (ECOC) programme series aims to present the diversity of European culture, focusing on the cultural values and dimensions of cities. In 2023, Debrecen, Győr and Veszprém, as Hungarian applicants, entered the second round of the selection procedure. Although most attention is focused on the cultural programs of the project year, the project application phase is also exciting, as applicant cities can present their plans, development ideas and potentials in the field of culture. The study compares the creative aspirations and cultural potential of these 3 cities, exploring the cultural visions, strengths and weaknesses of these culturally outstandingly ambitious cities, mainly using quantifiable indicators. The authors developed and applied a survey model having 14 indicators for a quantitative comparative analysis of the cultural, tourism and financial potential of the three cities. Comparing 2 large and 1 medium-sized cities in Hungary, the authors conclude that not only in Central and Eastern Europe, but also in Hungary, stronger efforts are made to have culturally rich and creative cities.

Open Access: Yes

DOI: 10.15196/TS600502

Exploring parental perspectives of childhood speech and language disorders across 10 countries: A pilot qualitative study

Isabel R. Rodriguez-Ortiz Sam Harding Rena Lyons Maja Kelić Kristine M. Jensen de López Inge S. Klatte Marina O. Tomazin Julie Feilberg Sofia Baena Tina C. Mantel Thora S. Ulfsdottir Rama Novogrodsky Krisztina Zajdó

Publication Name: Journal of Speech Language and Hearing Research

Publication Date: 2021-05-01

Volume: 64

Issue: 5

Page Range: 1739-1747

Description:

Purpose: Although researchers have explored parental perspectives of childhood speech and language disorders, most studies have been conducted in English-speaking countries. Little is known about parental experiences across countries, where procedures of language screening and services for language disorders differ. The authors participated in the COST1 Action network IS1406, “Enhancing Children’s Oral Language Skills Across Europe and Beyond,” which provided an opportunity to conduct cross-country qualitative interviews with parents. The aim of this pilot study was to explore ways in which parents construed and described speech and language disorders across countries. Method: Semistructured qualitative interviews were conducted with parents from 10 families in 10 different countries. The data were analyzed using thematic analysis. Findings: The overall theme was “acknowledging parental expertise.” The parents described, in detail, ways in which their children’s speech and language (dis)abilities had an impact on the children’s everyday life. Three subthemes were identified: impairment, disability, and changes over time. Conclusions: The findings suggest that, across a range of countries, parents demonstrated contextualized understandings of their children’s speech and language (dis)abilities, along with the everyday functional implications of the disorders. Hence, despite not holding professional knowledge about language disorders, the voices, views, understandings, and personal experiences of parents in relation to their child’s disorder should be listened to when planning therapy services.

Open Access: Yes

DOI: 10.1044/2020_JSLHR-20-00415

Cardiovascular Model Identification Using Neural ODE

B. Benyo Ákos Antal J. Geoffrey Chase Bálint Szabó K. Kovacs Cong Zhou Liam Murphy James Cushway Nicolas Davey Ákos Szlávecz Béla Paláncz

Publication Name: IFAC Papersonline

Publication Date: 2024-09-01

Volume: 58

Issue: 24

Page Range: 374-379

Description:

Acute circulatory failure (ACF) is a clinical syndrome when the heart and circulatory circulation cannot provide adequate blood supply to meet metabolic needs of the organs. ACF affects 30%- 50% of intensive care unit (ICU) patients. Fluid resuscitation is the primary treatment of ACF. However, it fails in a significant proportion (about 50%) of cases due to lack of clinically feasible non-invasive perfusion markers to assess the efficacy of the fluid therapy. Unfortunately, unsuccessful fluid therapy negatively affects patient outcome, increasing ICU length of stay and costs. Recent studies show identifying Stressed Blood Volume (SBV) of the cardiovascular system can be used to assess the potential efficacy of fluid therapy. The development of the diagnostic method requires the identification of the central arterial pressure curve based on the femoral arterial pressure, which is clinically available. This central arterial pressure curve can be used to identify the cardiovascular system parameters. In this study, the main goal was to develop a parameter-identification method for the Tube-load model-based transfer function connecting the femoral and central arterial pressure curve by using the so-called Physics-informed Neural Network methodology, namely the Neural ODE method. The study presents the adaptation of the Neural ODE method to the given parameter identification problem and the validation of the developed identification method. The robustness of the developed identification method was tested and used on a series of measurement data recorded in animal experiments.

Open Access: Yes

DOI: 10.1016/j.ifacol.2024.11.066