Gerhard-Wilhelm Weber

Gerhard-Wilhelm Weber
Poznan University of Technology

Prof. Dr.

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1,415
Publications
96,833
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8,914
Citations
Citations since 2017
474 Research Items
5789 Citations
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201720182019202020212022202305001,0001,500
201720182019202020212022202305001,0001,500

Publications

Publications (1,415)
Presentation
Content:  Introduction,  Regression and Classification,  MARS,  CMARS,  Robustification of CMARS: RCMARS,  Generalized Linear Models (GLMs),  Generalized Partial Linear Models (GPLMs),  Conic GPLMs,  Robust Conic GPLMs (RCGPLMs),  Numerical Experience with RCGPLM,  Process Version of RCGPLM,  Stochastic Dynamics with Fractional Brownian...
Article
Complex regulatory networks often have to be further expanded and improved with regard to the unknown effects of additional parameters and factors that can emit a disturbing influence on the key variables under consideration. The concept of target-environment TE networks provides a holistic framework for the analysis of such parameter-dependent mul...
Conference Paper
We propose a new method to explore the characteristics of genetic networks whose dynamics are described by a linear discrete dynamical model x t + 1 = Ax t . The gene expression data x t is given for various time points and the matrix A of interactions among the genes is unknown. First we formulate and solve a parameter estimation problem by linear...
Article
Full-text available
Background: This paper generalizes the results of Embedding problem of Fuzzy Number Space and its extension into a Fuzzy Banach Space C(Ω) × C(Ω), where C(Ω) is the set of all real-valued continuous functions on an open set Ω. Objectives: The main idea behind our approach consists of taking advantage of interplays between fuzzy normed spaces and no...
Presentation
Some references: N. Azevedo, D. Pinheiro and G.-W. Weber, Dynamic programming for a Markov–switching jump-diffusion, Journal of Computational and Applied Mathematics 267 (2014) 1–19. --- E. Savku and G.-W. Weber, A stochastic maximum principle for a Markov regime-switching jump-diffusion model with delay and an application to finance, JOTA (Journa...
Technical Report
Full-text available
We propose a new method to explore the characteristics of genetic networks whose dynamics are described by a linear discrete dynamical model x_t+1 = A*x_t. The gene expression data x_t is given for various time points and the matrix A of interactions among the genes is unknown. First we formulate and solve a parameter estimation problem by linear p...
Article
The aim of this thematic issue »Recent Advances in Systems, Decision Making, Business Intelligence and Learning« is to continue presenting the research achievement from the area of Systems Approach and Decision Support Systems for assessments of complex problems. The majority of the contributions were presented at the 23rd Conference on System Rese...
Presentation
Content:  Introduction,  Regression and Classification,  MARS,  CMARS,  Robustification of CMARS: RCMARS,  Generalized Linear Models (GLMs),  Generalized Partial Linear Models (GPLMs),  Conic GPLMs,  Robust Conic GPLMs (RCGPLMs),  Numerical Experience with RCGPLM  Process Version of RCGPLM Stochastic Dynamics with Fractional Brownian Mo...
Presentation
Full-text available
Some references: P. Taylan, G.-W. Weber and F. Yerlikaya, Continuous optimization applied in MARS for modern applications in finance, science and technology, ISI Proceedings of 20th Mini-EURO Conference "Continuous Optimization and Knowledge-Based Technologies" (Neringa, Lithuania, May 20-23, 2008) 317-322. --- P. Taylan, G.-W. Weber and F. Yerlika...
Article
Proportional-Integral-Derivative (PID) control is the most com-mon method applied in the industry due to its simplicity. On the other hand, due to its difficulties, parameter tuning of the PID controllers are usually per-formed poorly. Generally, the design objectives are obtained by adjusting the controller parameters repetitively until the desire...
Presentation
References: B. Kjamili and G.-W. Weber, METU International Student Association - and First International Student Congress "International in Turkey'': a Sparkling Initiative for Education, Friendship and Community Service, OR News 52 (November 2014) 44-45. --- B. Kjamili and G.-W. Weber, Opening Doors to International Students, IFORS News 8, 4 (Dece...
Chapter
Optimizers coming from different regions of the globe - Australia, Canada, China, France, Germany, Hong Kong, Japan, Korea, Macau, Malaysia, Mongolia, Norway, Poland, Saudi Arabia, South Africa, Singapore, South Australia, Taiwan, Thailand, Turkey, United Kingdom, USA, Vietnam, congregated in Taipei from December 12 to 16 for the 9th International...
Chapter
It was hard to resist an invitation from Muhammed Yasin Çodur, head of the Department of Civil Engineering of Erzurum Technical University (http://www.erzurum.edu.tr/) who was responsible for boosting the Turkish presence at the EURO 2012 in Vilnius and EUROINFORMS 2013 in Rome. I thus paid Erzurum Technical University (ETU) a visit on November 18....
Chapter
The 9th International Conference on Optimization: Techniques and Applications (ICOTA 9) was successfully held at National Taiwan University of Science and Technology (Taiwan Tech), in the exciting city of Taipei, Taiwan, on December 12-16, 2013 (http://icota9.conf.tw/). There were over 220 participants from 22 countries and areas. The co-chairs of...
Article
This paper aims to set up and solve a multi-period stochastic portfolio optimization model from an airline company’s point of view, considering all the specific European Union Emissions Trading Scheme (EU ETS) regulatory, managerial and trading constraints (i.e. physical constraints). Our contribution to existing academic literature is multiple. As...
Article
Since, with increased volatility and further uncertainties, financial crises translated a high ''noise'' within data from financial markets and economies into the related models, recent years' events in the financial world have led to radically untrustworthy representations of the future. Hence, robustification started to attract more attention in...
Article
The generalized class of stochastic hybrid systems consists of models with regime changes including the occurrence of impulsive behavior. In this paper, the stochastic hybrid processes with jumps are approximated by locally consistent Markov decision processes that preserve local mean and covariance. We further apply a randomized switching policy f...
Article
Empirical phenomenon in financial markets such as volatility smiles and term structure of implied volatilities made stochastic volatility models more attractive. In this paper, we consider a two-factor stochastic volatility model with slow and fast mean ...
Article
This paper develops an economic ordering policy model for non-instantaneous deteriorating items with selling price- and inflation-induced demand under the effect of inflation, permissible delay in payments and customer returns. Shortages are allowed and partially backlogged. The customer returns are assumed to increase with both the quantity sold a...
Chapter
We propose a new method to explore the characteristics of genetic networks whose dynamics are described by a linear discrete dynamical model x_{t + 1} = Ax_t . The gene expression data x_t is given for various time points and the matrix A of interactions among the genes is unknown. First we formulate and solve a parameter estimation problem by line...
Presentation
Some references: C.S. Pedamallu, L. Özdamar, L.S. Ganesh, G.-W. Weber and E. Kropat, A system dynamics model for improving primary education enrollment in a developing country, Organization - Journal of Management, Information Systems and Human Resources (Organizacija) 43, 3 (May-June 2010) 90-101; in the special issue at the occasion of EURO 2009...
Presentation
Some references: N. Azevedo, D. Pinheiro and G.-W. Weber, Dynamic programming for a Markov–switching jump-diffusion, Journal of Computational and Applied Mathematics 267 (2014) 1–19. --- --- E. Savku, N. Azevedo and G.W. Weber, Optimal Control of Stochastic Hybrid Models in the Framework of Regime Switches, in Springer Proceedings in Mathematics &...
Presentation
Some references: E. Kilic, A. Karimov and G.-W. Weber, Applications of Stochastic Hybrid Systems in Portfolio Optimization, Chapter 5 in the book Recent Advances in Computational Finance}, Nova Science Publishers, Inc., NY, N. Thomaidis and G.H. Dash, Jr, eds. (2013) 75-98; ISBN: 978-1-62618-123-6. --- E. Savku and G.-W. Weber, A stochastic maximu...
Article
This contribution is located in the common area of operational research and economics, with a close relation and joint future potential with optimization: game theory. We focus on collaborative game theory under uncertainty. This study is on a new class of cooperative games where the set of players is finite and the coalition values are interval gr...
Article
We consider an optimal control problem with a deterministic finite horizon and state variable dynamics given by a Markov-switching jump-diffusion stochastic differential equation. Our main results extend the dynamic programming technique to this larger family of stochastic optimal control problems. More specifically, we provide a detailed proof of...
Article
In this paper, we consider quantitative optimization problems on decomposable discrete systems. We restrict ourselves to labeled trees as the description of the systems and we use weighted automata on them as our computational model. We introduce a new kind of labeled decomposable trees, sum-like weighted labeled trees, and propose a method, which...
Article
Improvements in computer technologies have allowed more advanced exploration of global optimization. In particular, numerical solution methods for global optimization problems, which incorporate stochastic aspects, have been analyzed and used commonly in applied and engineering sciences. Global Optimization: A Stochastic Approach focuses on these m...
Article
Russian version of the article: Ö.N. Onak, Y. Serinagaoglu Dogrusöz and G.-W. Weber, Linear Inverse Electrocardiography Problem by Minimum Relative Entropy Method, International IFNA-ANS Journal "Problems of Nonlinear Analysis in Engineering Systems''.
Article
Full-text available
The problem of sample size estimation is important in medical applications, especially in cases of expensive measurements of immune biomarkers. This paper describes the problem of logistic regression analysis with the sample size determination algorithms, namely the methods of univariate statistics, logistics regression, cross-validation and Bayesi...
Article
Full-text available
In statistical research, regression models based on data play a central role; one of these models is the linear regression model. However, this model may give misleading results when data contain outliers. The outliers in linear regression can be resolved in two stages: by using the Mean Shift Outlier Model MSOM and by providing a new solution for...
Article
Full-text available
The usual goal in inverse electrocardiography (ECG) is to reconstruct cardiac electrical sources from body surface potentials and a mathematical model that relates the sources to the measurements [1-20]. Due to attenuation and smoothing that occurs in the thorax, the inverse ECG problem is ill-posed. Minimum relative entropy (MRE) is an approach fo...
Chapter
Full-text available
The system dynamics approach is a holistic way of solving problems in real-time scenarios. The Cross Impact Analysis (CIA) is a system dynamics method that enables the construction of a model relating entities and attributes relevant to a system. Then, the CIA simulates the model construct and observes the changing system status. The CIA permits th...
Chapter
In this chapter, we give a review and new interpretations on the solution of stochastic differential equation by using the change of time method and the numerical solution with stochastic Taylor expansion. Firstly, a random time change is analyzed. Time change is one of the standard tools for building financial models. The process can be done by a...
Chapter
In this study, we extend the well-known obligation rules by using interval calculus. We introduce interval obligation rules for minimum interval cost spanning tree (micst) situations. It turns out that the interval obligation rule and the interval Bird rule are equal under suitable conditions. Further, we show that such rules are interval cost mono...
Chapter
Coming from all corners of the globe: Belgium, Brazil, Canada, Finland, Georgia, Montenegro, Portugal, Spain, Sweden, Switzerland, Turkey, Ukraine, USA and all corners of Russia: Chelyabinsk, Chita, Dolgoprudny, Irkutsk, Kazan, Khimki, Krasnoyarsk, Moscow, Nizhny Novgorod, Novosibirsk, Obninsk, Perm, Petrozavodsk, Rostov-naDonu, Saint Petersburg, T...
Chapter
The 8th annual summer school “Achievements and Applications of Contemporary Informatics Mathematics and Physics” http:// summerschool.ssa.org.ua/ organized by volunteers from Student Science Association of National Technical University of Ukraine took place from August 1 to 17 this year. Participating were 73 students from 20 countries and 28 tutor...
Chapter
As in the past, the Summer School welcomed students from all academic backgrounds and degrees (Bachelor’s, Master’s or PhD, young scientists under 35 and professionals) with all courses taught in English. Highly qualified lecturers and scientists from Ukraine, Germany, Turkey, Spain, the Netherlands, Belgium, Sweden, Poland, Russia and other countr...
Presentation
Outline: 1 Introduction: - System of SDEs, - Stochastic Control Problem, 2 Sensitivity Approach, 3 Malliavin Calculus: - Malliavin Derivative, - Skorohod Integral, 4 Monte-Carlo Simulation, 5 Approximation Procedure, Approximation Procedure via It^o-Taylor Expansion, 6 Solution of Optimization Problem, 7 Application, 8 Conclusion and Outlook
Presentation
Content: - Introduction, - Regression, - MARS, - CMARS, - Robust Optimization, - Robustification of CMARS, - CMARS Model with Polyhedral Uncertainty, - Generalized Linear Models (GLMs), - Generalized Partial Linear Models (GPLMs), - Conic GPLMs, - Robust Conic GPLMs (RCGPLMs), - Numerical Experience with RCGPLM, - Real-word Application for RCGPLM,...
Presentation
Some references: E. Savku and G.-W. Weber, A stochastic maximum principle for a Markov regime-switching jump-diffusion model with delay and an application to finance, JOTA (Journal of Optimization Theory and Applications), Volume 179, Issue 2 (November 2017) pp. 696-721. --- E. Savku, N. Azevedo and G.W. Weber, Optimal Control of Stochastic Hybrid...
Presentation
Outline - Introduction: ◦ Spline functions, ◦ MARS, ◦ Atmospheric correction, Why?, ◦ Atmospheric correction, How?; - Study Area, Data Set & Methodology: ◦ MODIS, ◦ MARS on MODIS Images; - Results & Concluding Remarks
Presentation
Some references: E. Savku and G.-W. Weber, A stochastic maximum principle for a Markov regime-switching jump-diffusion model with delay and an application to finance, JOTA (Journal of Optimization Theory and Applications), Volume 179, Issue 2 (November 2017) pp. 696-721. --- N. Azevedo, D. Pinheiro and G.-W. Weber, Dynamic programming for a Markov...
Chapter
The workshop Nonlinear Optimization: A bridge from theory to applications is an international conference which took place in Erice, Sicily, Italy at the “E. Majorna Centre for Scientific Culture”, in June 10-17 2013, with 38 contributed lectures and 14 invited lectures. This conference was the 59th workshop of the International School of Mathemati...
Preprint
Target-environment networks provide a conceptual framework for the analysis and prediction of complex regulatory systems such as genetic networks, eco-finance networks or sensor-target assignments. These evolving networks consist of two major groups of entities that are interacting by unknown relationships. The structure and dynamics of the hidden...
Presentation
Outline: � Introduction: ◦ Atmospheric correction, Why?, ◦ Atmospheric correction, How?, ◦ MARS & CMARS; � Study Area, Data Set & Methodology: ◦ MARS & CMARS on MODIS Images; � Results & Concluding Remarks
Conference Paper
In: VII Moscow International Conference on Operations Research (ORM2013), Moscow, Russia, October 15-19, 2013, 241-244.
Conference Paper
In: Proceedings Volume 1, VII Moscow International Conference on Operations Research (ORM2013), Moscow, Russia, October 15-19, 2013, 88-91.
Chapter
cf. https://istina.msu.ru/conferences/presentations/4890605/ and http://io.cs.msu.su/ORM2013/FINAL/ORM2013_Vol_I_ENG.pdf
Presentation
Reference: E. Daylova and G.-W. Weber, From Russia, With Love for OR: The Seventh Moscow International Conference on Operations Research, IFORS News 7, 4 (December 2013) 5.
Presentation
Some references: S. Kuter, G.-W. Weber, A. Özmen and Z. Akyürek, Modern applied mathematics for alternative modelling of the atmospheric effects on satellite images, Chapter 27 in book Modeling, Optimization, Dynamics and Bioeconomy I, Springer Proceedings in Mathematics & Statistics}, Volume 73, 2014, pp. 469-485, D. Zilberman and A. Pinto, eds. -...
Presentation
Some references: E. Savku and G.-W. Weber, A stochastic maximum principle for a Markov regime-switching jump-diffusion model with delay and an application to finance, JOTA (Journal of Optimization Theory and Applications), Volume 179, Issue 2 (November 2017) pp. 696-721. --- N. Azevedo, D. Pinheiro and G.-W. Weber, Dynamic programming for a Markov...
Presentation
Some references: F. Yilmaz, H. Öz and G.W. Weber, Simulation of Stochastic Optimal Control Problems with Symplectic Partitioned Runge-Kutta Scheme, Dynamics of Continuous, Discrete and Impulsive Systems, Series B, 22, 6 (December 2015) 425-440. --- H. Öz, F. Yilmaz and G.-W. Weber, A discrete optimality system for an optimal harvesting problem, Com...
Article
The allocation problem of rewards or costs is a central question for individuals and organizations contemplating cooperation under uncertainty. The involvement of uncertainty in cooperative games is motivated by the real world where noise in observation and experimental design, incomplete information and further vagueness in preference structures a...
Presentation
Some references: E. Savku and G.-W. Weber, A stochastic maximum principle for a Markov regime-switching jump-diffusion model with delay and an application to finance, JOTA (Journal of Optimization Theory and Applications), Volume 179, Issue 2 (November 2017) pp. 696-721. --- E. Savku, N. Azevedo and G.W. Weber, Optimal Control of Stochastic Hybrid...
Conference Paper
In: International IFNA-ANS Journal "Problems of Nonlinear Analysis in Engineering Systems'',, No. 1(41), vol. 20 (2014) 71-78 (in Russian)
Conference Paper
In: International IFNA-ANS Journal ``Problems of Nonlinear Analysis in Engineering Systems'', No. 1(41), vol. 20 (2014) 130-135
Conference Paper
In: International IFNA-ANS Journal ``Problems of Nonlinear Analysis in Engineering Systems'', No. 1(41), vol. 20 (2014) 136-142 (in Russian)
Chapter
The highly-successful 2nd International Conference on Operations Research (InteriOR 2013) http://www. interior2013.org/ was held August 26-27, 2013, in Medan, North Sumatera, Indonesia. Jointly organized by the Department of Mathematics, University of Sumatera Utara, and Indo Mathematical Society, the twoday meeting attracted over 315 old hands and...
Chapter
The annual international workshop Networking Games and Management (NGM-2013) http://mathem.krc.karelia.ru/ event.php?id=184&plang=rand. was held June 23-25, 2013 at a recreation camp in Urozero on the shore of one of the cleanest lakes in Europe. With nature as a backdrop, participants gathered to discuss the latest trends and advances of game-theo...
Chapter
The workshop Nonlinear Optimization: A bridge from theory to applications http://www.dis.uniroma1. it/~erice2013/ is an international conference which took place in Erice, Sicily, Italy at the Ettore Majorana Foundation and Centre for Scientific Culture (EMFCSC). Held from June 10 to 17 2013, the conference featured 38 contributed and 14 invited le...
Chapter
The stream “Initiatives for OR Education” was held July 3, 2013, during the EURO-INFORMS 2013 at Sapienza University. The main focus of the stream was to exchange experiences about existing initiatives for OR education - to share and systematize common approaches and methods for creating, adopting and developing OR courses in regular and extended e...
Chapter
Florence was the site of the 11th Meeting of the Continuous Optimization Working Group of EURO (EUROPT Workshop) from June 26-28, 2013. From the very first one held in Budapest, Hungary in 2000, EUROPT workshops have been highly appreciated by the international optimization community. About180 researchers made their way to Florence en route to the...
Chapter
VII International Conference on Game Theory and Management http:// www.gsom.spbu.ru/en/gtm2013/ was held at the Graduate School of Management, St. Petersburg University in Russia from June 26- 28, 2013. This annual English-speaking conference is a product of the long-term multilateral cooperation between St. Petersburg University (Graduate School o...
Presentation
Some references: E. Savku and G.-W. Weber, A stochastic maximum principle for a Markov regime-switching jump-diffusion model with delay and an application to finance, JOTA (Journal of Optimization Theory and Applications), Volume 179, Issue 2 (November 2017) pp. 696-721. --- E. Savku, N. Azevedo and G.W. Weber, Optimal Control of Stochastic Hybrid...
Presentation
Some references: S. Kuter, G.-W. Weber, A. Özmen and Z. Akyürek, Modern applied mathematics for alternative modelling of the atmospheric effects on satellite images, Chapter 27 in book Modeling, Optimization, Dynamics and Bioeconomy I, Springer Proceedings in Mathematics & Statistics}, Volume 73, 2014, pp. 469-485, D. Zilberman and A. Pinto, eds. -...
Presentation
Some references: A. Özmen and G.-W. Weber, RMARS: Robustification of Multivariate Adaptive Regression Spline under Polyhedral Uncertainty, Journal of Computational and Applied Mathematics (JCAM) 259 (2014) 914-924, in special issue at the occasion of ICACM - International Conference on Applied and Computational Mathematics Ankara, Turkey, October 3...
Preprint
In this paper, we develop a mathematical model to analyse a dynamical system of a stochastic process of a certain type of bacterial conjugation in microbiology and give a general solution. We consider three types of bacteria which are called F-recipients, F+ donors with free plasmid and F+ donors with integrated plasmid, with arbitrary initial cond...
Chapter
The aim of the project of this book, Soft Computing Intelligent Algorithms in Engineering, Management, and Technology, has been to explore the emerging and current cutting edge technology in the research fields of soft computing intelligent algorithms and their original, novel and innovative modern-time real-world applications. During the past deca...
Presentation
Some references: A. Özmen and G.-W. Weber, RMARS: Robustification of Multivariate Adaptive Regression Spline under Polyhedral Uncertainty, Journal of Computational and Applied Mathematics (JCAM) 259 (2014) 914-924, in special issue at the occasion of ICACM - International Conference on Applied and Computational Mathematics Ankara, Turkey, October 3...
Presentation
Outline: 1 The Mean-Variance Approach in a One-Period Model: Introduction; --- 2 The Continuous-Time Market Model: Modeling the Security Prices, Excursion 1: Brownian Motion and Martingales, Continuation: Modeling the Security prices, Excursion 2: The Itˆo Integral, Excursion 3: The Itˆo Formula, Trading Strategy and Wealth Process, Properties of t...
Presentation
Based on a lecture by S. Jaimungal, STA 2502 / ACT 460, Department of Statistics and Mathematical Finance Program, University of Toronto, 2006
Presentation
Some references: E. Kropat, A. Özmen, G.-W. Weber, S. Meyer-Nieberg and Ö. Defterli, Fuzzy Prediction Strategies for Gene-Environment Networks – Fuzzy Regression Analysis for Two-Modal Regulatory Systems, RAIRO Operations Research 50, 2 (2016) 413–435, in the Special Issue at the occasion of CBBM 2014, Poznan - Biedrusko, Poland, June 26-28, 2014;...
Presentation
Some references: F. Yilmaz, H. Öz and G.W. Weber, Simulation of Stochastic Optimal Control Problems with Symplectic Partitioned Runge-Kutta Scheme, Dynamics of Continuous, Discrete and Impulsive Systems, Series B, 22, 6 (December 2015) 425-440. --- H. Öz, F. Yilmaz and G.-W. Weber, A discrete optimality system for an optimal harvesting problem, Com...
Presentation
Some references: V. Purutcuoglu, T. Erdem and G.-W. Weber, Inference of the JAK-STAT gene network via graphical models, in: Advances in Simulation-Based Decision Support, Volume II, M. Kljajic and G.E. Lasker (eds.), The International Institute for Advanced Studies in System Research and Cybernetics, 2011, 46-50, ISBN 9781897233382. --- E. Ayyildiz...
Presentation
Reference: T. Paksoy, E. Özceylan, N. Yapici Pehlivan and G.-W. Weber, Particle swarm optimization approach for estimation of energy demand of Turkey, in the proceedings of PCO 2011 Dubai, the 5th Global Conference on Power Control and Optimization, Dubai, United Arab Emirates, June 1-3, 2011; ISBN: 983-44483-49.
Presentation
In this study, we will discuss genetic regulatory systems to express and predict clearly the connections and influences among the genes and environmental factors in a cell metabolism. The corresponding model is described using dynamical equations based on a class of time-continuous ordinary differential equations and containing unknown parameters t...
Presentation
We adjust the formulation of desirability functions and consider the generalized case having a piecewise max-type structure for solving their optimization problem by nonsmooth optimization approaches. This optimization problem is needed to be robustified because the regression may be done under lack of knowledge about the underlying model and scena...
Presentation
Abstract: We present applications of Stochastic Hybrid (SH) models in finance which also accounts for regime switching dynamics. We implement SH models with insider information in framework of portfolio optimization with optimal investment and consumption strategies. The article ends with the parameter estimation and also stochastic simulation base...
Presentation
Please cf. https://euro2013.euro-online.org/data/http_/euro2013.org/wp-content/uploads/program-euro26.pdf, pages 224-225. Ethics and OR - EthOR Award Prize; Stream: OR and Ethics; Invited session; Chair: Fred Wenstøp, Strategy and Logistics, BI Norwegian School of Management, Nydalsveien 37, 0483, Oslo, Norway, fred.wenstop@bi.no; Chair: Cristobal...
Article
Recent financial crises, with an increased volatility and, hence, uncertainty factors, have introduced a high "noise" into the data taken from the financial sectors and overall from any data related to the financial markets, so that the known statistical models do not give trustworthy results. As we know the solutions of the optimization problem ca...
Presentation
Some references: G.-W. Weber, I. Batmaz, G. Köksal, P. Taylan and F. Yerlikaya-Özkurt, CMARS: A new contribution to nonparametric regression with multivariate adaptive regression splines supported by continuous optimisation, Inverse Problems in Science and Engineering (IPSE) 20, 3 (April 2012) 371-400. --- F. Yerlikaya-Özkurt, C. Vardar-Acar, Y. Yo...
Conference Paper
In: GTM2013, June 26-28, 2013, St. Petersburg University and The International Society of Dynamic Games (Russian Chapter) (2013), Abstracts, pages 180-181
Book
In this paper, we generalize the well-known mountain situations by introducing multiple sources called the forest situations. We deal with the cost sharing problem by introducing the cooperative cost game. We show that the Bird allocation is a special core element of the related cost game corresponding to the forest situation. Further, we give solu...
Presentation
Some references: B.Z. Temocin and G.-W. Weber, Optimal control of stochastic hybrid system with jumps: a numerical approximation, Journal of Computational and Applied Mathematics (JCAM) 259 (2014) 443-451, special issue at the occasion of ICACM - International Conference on Applied and Computational Mathematics, Ankara, Turkey, October 3-6, 2012....
Presentation
Full-text available
References: O. Palanci, S.Z. Alparslan Gök and G.-W. Weber, Interval obligation rules and related results, in: Contributions to Game Theory and Management, Volume VII, 2014, 262-270; at the occasion of GTM 2013, St. Petersburg, Russia, edited by L.A. Petrosyan and N.A. Zenkevich, St. Petersburg University and The International Society of Dynamic Ga...
Chapter
EURO Working Group on Continuous Optimization (EUROPT, http:// europt.iam.metu.edu.tr/), the working group within The Association of European Operational Research Societies (EURO http://www.euroonline.org/) announces its partnership with the Pacific Optimization Research Activity Group (POP). EUROPT was established in 2000 during the annual EURO co...
Presentation
Some references: E. Savku and G.-W. Weber, A stochastic maximum principle for a Markov regime-switching jump-diffusion model with delay and an application to finance, JOTA (Journal of Optimization Theory and Applications), Volume 179, Issue 2 (November 2017) pp. 696-721. --- E. Savku, N. Azevedo and G.W. Weber, Optimal Control of Stochastic Hybrid...
Article
This paper contributes to classification and identification in modern finance through advanced optimization. In the last fewdecades, financialmisalignments and, thereby, financial crises have been increasing in numbers due to the rearrangement of the financial world. In this study, as one of the most remarkable of these, countries’ debt crises, whi...
Article
Full-text available
An appropriate distance is an essential ingredient in various real-world learning tasks. Distance metric learning proposes to study a metric, which is capable of reflecting the data configuration much better in comparison with the commonly used methods. We offer an algorithm for simultaneous learning the Mahalanobis like distance and K-means cluste...
Conference Paper
Stochastic Optimal Control is extensively used in various applications in financial mathematics and. In this study, applications of Stochastic Hybrid models in finance to account for regime switching dynamics are presented. Stochastic models with a motion part and additionally a jump part are able to capture abrupt fluctuations and they allow for m...
Chapter
Full-text available
Optimization has become a key technology in all areas on academical life and its practical use in real life. In fact, contributions of modern Optimization range from science, engineering, economics, the sectors of finance, energy, environment and ecology to social sciences and emerging “new frontiers,” “hard” and “soft” ones combined, with all thei...
Preprint
In this study, we extend the well-known obligation rules by using interval calculus. We introduce interval obligation rules for minimum interval cost spanning tree (micst) situations. It turns out that the interval obligation rule and the interval Bird rule are equal under suitable conditions. Further, we show that such rules are interval cost mono...
Presentation
Some references: E. Savku and G.-W. Weber, A stochastic maximum principle for a Markov regime-switching jump-diffusion model with delay and an application to finance, JOTA (Journal of Optimization Theory and Applications), Volume 179, Issue 2 (November 2017) pp. 696-721. --- N. Azevedo, D. Pinheiro and G.-W. Weber, Dynamic programming for a Markov...
Presentation
Some references: G.-W. Weber, P. Taylan, K. Yildirak and Z.K. Görgülü, Financial regression and organization, in the Special Issue on Optimization in Finance, of DCDIS-B (Dynamics of Continuous, Discrete and Impulsive Systems (Series B)) 17, 1b (2010) 149-174. --- F. Yerlikaya-Özkurt, C. Vardar-Acar, Y. Yolcu-Okur and G.-W. Weber, Estimation of th...

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Projects (37)
Project
Dear Colleagues, Circular economy (CE) is a key solution to dealing with resource crises, in terms of waste produced and the resources consumed. It reduces the need for raw materials by making better use of existing ones. There is a growing need in the CE for organizational culture to change toward sustainability. Supply chains can benefit from a circular economy, which requires a paradigm shift from conventional to sustainable practices. Due to this concern, CE integration has become one of the most critical strategies in developing sustainable supply chains. In order to contribute to the attainment of sustainability objectives in emerging economics, CE is committed to ensuring sustainable resource management strategies for more efficient resource utilization to preserve the environment, social conditions, and the economy. A sustainable circular economy (SCE), which combines a CE and sustainability, can contribute to energy recovery, resource efficiency, economic growth, sustained consumption, and circularity at the macro-level. Digitalisation and smart technologies can promote the transition to a SCE, while businesses can perform more efficient, effective, smart, inclusive, and sustainable operations by integrating smart enabling technologies into SCE. Getting organizations on board with Industry 4.0 will only be possible if they are motivated by a clear understanding of its strategic significance related to SCE. Smart sustainable circular economy (SSCE) is crucial for management to devote time and resources to knowledge management programs, training, and education. For SSCE to succeed, it is necessary to identify employees with the appropriate background for implementing advanced technologies. During the CE adaptation process to SSCE, organisations should also understand the importance of interfacing with humans and machines. There are different perspectives on the CE, which include, but are not limited to, the following: -Identifying sustainability criteria for CE in emerging economies; -Establishing sustainable operations in the context of Industry 4.0 and CE; -Role of smart supply chain in the circular economy; -CE application challenges in sustainable supply chains; -Application of CE and industry 4.0 driven technologies in the food supply chain; -Application of smart circularity practices in the sustainable supply chain management; -Optimizing sustainable supply chain models for CE framework; -CE and sustainable supply chain challenges; -CE strategies for net zero transition; -Advanced analytics ai/ml models for SSCE 4.0 development. Dr. Sadia Samar Ali Prof. Dr. Gerhard-Wilhelm Weber Dr. Erfan Babaee Tirkolaee Dr. Alireza Goli Guest Editors For more information: https://www.mdpi.com/journal/sustainability/special_issues/2IQ27HQTJX
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Dear Colleagues, Optimization plays an important role in several branches of engineering sciences. Optimization challenges are becoming increasingly complex, especially in supply chain planning; nowadays, traditional methods are not effective enough to solve complex optimization problems. New variants of meta-heuristic algorithms have recently emerged that primarily aim to combine innovative methods to better search for solutions. Many such algorithms have been inspired by nature; the most significant include the Keshtel Algorithm (KA), Red Deer Algorithm (RDA), and Gray Wolf Optimizer (GWO). Various optimization problems have also been proposed to find suitable, eligible, optimal solutions for sustainability. Furthermore, researchers and decision-makers have developed and widely employed meta-heuristic algorithms for various complex problems. In fact, it can be argued that in the future, almost all aspects of human daily life will be affected by this technology. Experts believe that meta-heuristic algorithms will soon be able to find the best possible solution for supply chains. This Special Issue, “Logistics and Operations Modelling and Optimization for Sustainable Supply Chain”, enables transparent and rapid communication of research highlighting the role of optimization in multidisciplinary areas across mathematical programming and optimization. The emphasis is on the impact, depth, and originality of new concepts, methods, and observations with respect to novel methods such as meta-heuristic algorithms. This Special Issue seeks to clarify how optimization approaches can be evaluated and implemented in sustainable supply chains. We welcome submissions highlighting new solutions to sustainable supply chain problems from a broad range of perspectives, which may include, but are not limited to, the following: -Sustainable supply chain network design using approximate optimization methods; -Sustainable Production and distribution using novel meta-heuristic algorithms; -Transportation optimization using novel meta-heuristic algorithms; -Supply chain planning using new emerged meta-heuristic algorithms; -Simulation-based optimization for sustainable supply chain planning; -Application of meta-heuristics in developing machine learning for sustainable supply chain planning; -Application of meta-heuristics in improving the neural networks for sustainable supply chain planning; -Application of meta-heuristics in developing clustering methods for sustainable supply chain planning; -Logistic network design using data-driven; Guest Editors Prof. Dr. Gerhard-Wilhelm Weber Dr. Alireza Goli Dr. Erfan Babaee Tirkolaee For further information, please see: https://www.mdpi.com/journal/sustainability/special_issues/logistics_operations
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Discussions of the resiliency, sustainability, and agility of supply chains are important in the research and management of supply chains in these difficult times, considering the ongoing pandemic of COVID-19 [1]. Ivanov [2] proposed that a viable supply chain is characterized by resiliency, sustainability, and agility in its network design. Resiliency is essential because disruption and demand fluctuations are forced upon SCs, and the effects of these for many managerial supply chains are unknown. In addition, applying novel technology in the supply chain, such as blockchain, Internet-of-Things (IoT), and artificial intelligence (AI) as agility tools can assist and enable the transition to lean production. We, as researchers, should propose methods using a mathematical modeling approach to improve the current situation and mitigate the crisis. There is great fluctuation of demand, and given that customers are preferentially shifting to e-commerce, many supply chains that lack e-commerce are destined to fail. In addition to resiliency and agility, we should pay more attention to the sustainability and greenness of a supply chain in terms of its network design or production planning. In the strategic, tactical, and operational decisions, we should consider the environmental impact, energy consumption, and social impact [3,4]. Carbon emissions, carbon trading, and waste management are effective solutions to decrease the environmental impact. Using renewable and clean energy is one strategy to apply viable management [5]. In this complex situation, given the pressure on people, we have to retain and maintain human resources that represent the best solution to ensure the welfare and suitability of the supply chain. In addition, applying new technologies such as blockchain technology and running smart contracts require modeling to demonstrate the advantages of the new technology [7-9]. This Special Issue (SI) aims to investigate management of resiliency and sustainability in supply chains. We are thus seeking contributions from authors presenting novel mathematical models toward ensuring resiliency, sustainability, and agility in supply chains. For further information, please see: https://www.springer.com/journal/11356/updates/20220644