Browsing NUP Academic Publications - Ακαδημαϊκές Δημοσιεύσεις ΠΝΠ by Title

Now showing items 417-436 of 1593

  • ‘Horses for Courses’ in demand forecasting 

    Petropoulos, Fotios; Makridakis, Spyros; Assimakopoulos, Vassilis (Elsevier, 2014-02-22)
    Forecasting as a scientific discipline has progressed a lot in the last 40 years, with Nobel prizes being awarded for seminal work in the field, most notably to Engle, Granger and Kahneman. Despite these advances, even ...

  • How Accurate and Reliable (Certain) Are Medical Predictions? 

    Makridakis, Spyros (2015)
    Unpredictability and uncertainty reigns over most of medicine. Should women be screened for mammography and men for prostate cancer? The answer is not obvious as a growing number of researchers and doctors assert that the ...

  • How much does a zero-permission Android app know about us? 

    Dimitriadis, Antonios; Drosatos, George; Efraimidis, Pavlos S. (2019-11)
    Android devices contain a vast amount of personal data of their owners. These data are stored on the device and are protected by the Android permission scheme. Android apps can obtain access to specific data items by ...

  • How Rewarding is Technical Analysis? Evidence from Athens Stock Exchange 

    Vasiliou, Dimitrios; Eriotis, Nikolaos; Papathanasiou, Spyros (Springer, 2006)
    The purpose of this paper is to investigate the performance of various technical trading rules in the Athens Stock Market. We test two of the simplest and most popular trading rules- Moving Averages and MACD Indicator. We ...

  • How Smart Are Smartphones?: Bridging the marketing and information technology gap. 

    Amanatiadis, Angelos; Chatzichristofis, Savvas A. (IEEE, 2014)
    The term "smart" has become widespread in consumer electronics in recent years, reflecting the consumers' need for devices that assist them in their daily activities. The term has a long history of usage in marketing science ...

  • Human security in EU strategy: reflecting on the experience of EUPM in Bosnia and Herzegovina and EULEX in Kosovo 

    Fakiolas, Efstathios T.; Tzifakis, Nikolaos (Routledge. Taylor & Francis Group, 2019)
    In the early 2000s, the EU incrementally appeared to have espoused a distinguishing human security discourse. This was bound not only to inform its crisis management operations but also to shape its global role. Today, the ...

  • Hybrid Cellular Ants for Clustering Problems 

    Bitsakidis, Nikolaos P.; Chatzichristofis, Savvas A.; Sirakoulis, Georgios Ch. (Old City Publishing, 2014)
    In the last decade the amount of the stored data related to almost all areas of life has rapidly increased. However, the overall process of discovering knowledge from data demands more powerful clustering techniques to ...

  • Hybrid scheme for fast and accurate image retrieval based on color descriptors 

    Chatzichristofis, Savvas A.; Boutalis, Yiannis (ACTA Press, Canada, 2007)
    This paper proposes a new image retrieval system, thatuses only color features and it's based on a hybrid scheme which combines crisp and fuzzy techniques, in order to retrieve color based similar images. The system ...

  • Hypertension: empirical evidence and implications in 2014 

    Makridakis, Spyros; DiNicolantonio, James J. (Open Heart, 2014-05-28)
    High blood pressure (HBP) or hypertension (HTN) is one of the leading causes of cardiovascular (CV) morbidity and mortality throughout the world. Despite this fact, there is widespread agreement that the treatment of HBP, ...

  • Identification and Retrieval of DNA Genomes Using Binary Image Representations Produced by Cellular Automata 

    Konstantinidis, K.; Amanatiadis, A.; Chatzichristofis, Savvas A.; Sandaltzopoulos, R.; Sirakoulis, G. Ch. (IEEE (Computer Society), 2014)
    We have developed a novel method for the identification and retrieval of DNA sequences which are represented as binary images. This type of representation emanates from the evolution of one-dimensional nucleotide arrays ...

  • If we cannot forecast how can we plan? 

    Makridakis, Spyros (Elsevier, 1981)
    The purpose of this article is to deal directly and explicitly with the issues and problems currently facing forecasting, planning and strategy and to discuss how the challenges of the 1980s can be realistically and ...

  • Il rispetto del valore dell' uomo come limite e regola di giudizio della sperimentazione biomedica. L ' esperienza constituzionale greca 

    Manitakis, Antonis (Società Editrice il Mulino, 1997)
    Il tema dei rapportl Intercorrenti tra sperimentazione bioetica e diritti umani non ha suscitato particolari dibattiti nell' ordinamento giuridico greco. li motivo di questo limitato jnteresse risiede nel fatto che, da uh ...

  • Image classification by addition of spatial information based on histograms of orthogonal vectors 

    Zafar, Bushra; Ashraf, Rehan; Ali, Nouman; Ahmed, Mudassar; Jabbar, Sohail; Chatzichristofis, Savvas A. (PLOS ONE, 2018-06-08)
    The Bag-of-Visual-Words (BoVW) model is widely used for image classification, object recognition and image retrieval problems. In BoVW model, the local features are quantized and 2-D image space is represented in the form ...

  • Image Encryption using the Recursive Attributes of the eXclusive-OR Filter 

    Chatzichristofis, Savvas A.; Marques, Oge; Lux, Mathias; Boutalis, Yiannis (Springer, 2014)
    This paper describes a visual multimedia content encryption approach based on cellular automata (CA), expanding the work proposed in [4]. The presented algorithm relies on an attribute of the eXclusive-OR (XOR) filter, ...

  • Image Encryption Using the Recursive Attributes of the eXclusive-OR Filter on Cellular Automata 

    Chatzichristofis, Savvas A.; Marques, Oge; Mathias, Lux; Boutalis, Yiannis (Springer-Verlag, 2012)
    A novel visual multimedia content encryption method based on cellular automata (CA) is presented in this paper. The proposed algorithm is based on an attribute of the eXclusive-OR (XOR) logic gate, according to which, ...

  • Image Moment Invariants as Local Features for Content Based Image Retrieval using the Bag-of-Visual-Words Model 

    Karakasis, Evangelos G.; Amanatiadis, Angelos; Gasteratos, Antonios; Chatzichristofis, Savvas A. (Elsevier, 2015)
    This paper presents an image retrieval framework that uses affine image moment invariants as descriptors of local image areas. Detailed feature vectors are generated by feeding the produced moments into a Bag-of-Visual-Words ...

  • Images of domestic suburbia in greek films of the 50's and 60's 

    Dova, Evanthia; Tentokali, Vana (Dakam, 2017-03)
    The paper is an attempt to approach the imaginary dimension of ‘making a home’ in the urban periphery; in sites that are still under construction, in places whose character is still undefined and fleeting. ‘Making a home’ ...

  • img(Anaktisi): A Web Content Based Image Retrieval System 

    Zagoris, Konstantinos; Chatzichristofis, Savvas A. (IEEE, 2009)
    img(Anaktisi) is a C#/.NET content base image retrieval application suitable for the web. It provides efficient retrieval services for various image databases using as a query a sample image, an image sketched by the ...

  • Img(Rummager): An Interactive Content Based Image Retrieval System 

    Chatzichristofis, Savvas A.; Boutalis, Yiannis; Lux, Mathias (IEEE (Institute of Electrical and Electronics Engineers , United States), 2009)
    This paper presents an image retrieval suite called img(Rummager) which brings into effect a number of new as well as state of the art descriptors. The application can execute an image search based on a query image, either ...

  • The Impact of Empirical Accuracy Studies On Time Series Analysis and Forecasting 

    Fildes, Robert; Makridakis, Spyros (International Statistical Institute (ISI), 1995-12)
    This paper examines a major area of statistics: the application of time series analysis to forecasting, particularly as it applies to the areas of business and economics. This area is unusual in the social sciences in that ...