Panagiotis Chountas

Dr. Panagiotis Chountas

University of Westminster, London, City of London, UK

Research Focus & Metrics

Academic Career Length

23Years (2004-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 July 2024 in Algorithms
Verified
Journal Article
Open access
PDF file
GUGeorgy Urumov
Georgy Urumov
PCPanagiotis Chountas
Panagiotis Chountas
Thierry ChaussaletThierry Chaussalet
Thierry Chaussalet
In traditional finance, option prices are typically calculated using crisp sets of variables. However, as reported in the literature novel, these parameters possess a degree of fuzziness or uncertainty. This allows participants to estimate option prices based on their risk preferences and beliefs, considering a range of possible values for the parameters. This paper presents a comprehensive review of existing work on fuzzy fractional Brownian motion and proposes an extension in the context of financial option pricing. In this paper, we define a unified framework combining fractional Brownian motion with fuzzy processes, creating a joint product measure space that captures both randomness and fuzziness. The approach allows for the consideration of individual risk preferences and beliefs about parameter uncertainties. By extending Merton’s jump-diffusion model to include fuzzy fractional Brownian motion, this paper addresses the modelling needs of hybrid systems with uncertain variables. The proposed model, which includes fuzzy Poisson processes and fuzzy volatility, demonstrates advantageous properties such as long-range dependence and self-similarity, providing a robust tool for modelling financial markets. By incorporating fuzzy numbers and the belief degree, this approach provides a more flexible framework for practitioners to make their investment decisions.

1 October 2010
Verified
Conference Paper
Closed access
MAMohammedsharaf Alzebdi
Mohammedsharaf Alzebdi
PCPanagiotis Chountas
Panagiotis Chountas
Krassimir AtanassovKrassimir Atanassov
Krassimir Atanassov
Data Warehouse (DWH) Models are based on static dimensions having single hierarchies. With the evolution of World Wide Web, including external knowledge can enrich those models and provide better results of data analysis. Therefore, it would be useful to have intelligent transformation utilities that can mine various data structures and extract useful knowledge participating in the construction of flexible DWH models. This paper proposes a new approach towards intelligent transformation utilities that will allow the utilisation of multiple hierarchical schemata when defining the dimensions of data-warehouses. By allowing a particular dimension to have multiple but semantically close definitions, we allow same users to query same data with the aid of different semantics. To put it differently users are allowed to change or refine the axis of analysis with respect to a particular query, in their effort to achieve a more meaningful answer. We make use of Intuitionistic Fuzzy Logic to soften the rules of calculating the similarity between different hierarchies which in turn is used to decide if the hierarchies can be included in the definition of data warehouse dimension. Data transformations are used to transform the data from one hierarchy to another. With the aid of external data, some sort of estimation is used to estimate values of new hierarchy levels and then based on the user's request the desired hierarchy is used to view an OLAP cube.


1 September 2006
Verified
Conference Paper
Open access
HWHuang Wei
Huang Wei
EEElia El-Darzi
Elia El-Darzi
PCPanagiotis Chountas
Panagiotis Chountas
PLPeng Liu
Peng Liu
In recent years, the providers of public and private sector health care services have been faced with some radical changes in the society they serve, and more importantly, development in the way that traditional health care is delivered to information technology (I.T.) based communities. It is widely believed by health care professionals that the better health care results really come from the improved healthcare systems and more effective health care services' management. This paper focuses on using an agent-based software engineering approach and design models to the development of an appropriate agent-based healthcare software system is described in which software researchers collaborate with environment builders to enhance the levels of cooperation and support provided within an integrated agent-based community healthcare system

1 May 2018 in Notes on Intuitionistic Fuzzy Sets
Verified
Journal Article
Open access
PCPanagiotis Chountas
Panagiotis Chountas
KAKrassimir Atanassov
Krassimir Atanassov
Vassia AtanassovaVassia Atanassova
Vassia Atanassova
ESEvdokia Sotirova
Evdokia Sotirova
SSSotir Sotirov
Sotir Sotirov
Olympia RoevaOlympia Roeva
Olympia Roeva