G. Karagiannis

• PhD Electrical Engineering
• Scientific Director at "Ormylia" Foundation

Ο μηχανισμός αυτο-ίασης των τσιμεντοειδών υλικών έχει διερευνηθεί από πολλούς ερευνητές τις τελευταίες δύο δεκαετίες. Στο ταξίδι αυτής της αναζήτησης, έχουν χρησιμοποιηθεί όλο και πιο προηγμένες μέθοδοι ανάλυσης του μηχανισμού ίασης. Αυτές οι μέθοδοι έχουν σκοπό να αποσαφηνίσουν και να ποσοτικοποιήσουν τον μηχανισμό επούλωσης. Ωστόσο πολλοί από του...

The study of the art objects’ paint layers stratigraphy is crucial for their documentation, since it provides important information related to the painting technique and also the previous restoration attempts, if any. Simultaneously, nondestructive evaluation of the cultural heritage objects is crucial, given the fact that cultural heritage objects...

Stone has been a basic building material of different monuments and structural components such as foundations and masonry. At the same time, dif-ferent types of stones have been used for decorative architectural elements, such as cornices, reliefs, colonnettes, and corbels. The maintenance of stone ele-ments is essential for the continuity of these...

In the current work the endoscopy and retrieval of mortar covered mosaic patterns, such as the Hagia Sophia ones, is presented. In particular, an appropriate instrumentation is developed combining ultra-sonic tomography and an accurate motion planning. The acquisition of high-response tomographic images is performed utilizing transducers in a linea...

The preservation of the Athenian Acropolis monuments constitutes an ongoing top-priority national project of global significance and impact. The project concerning the analytical investigation of the polychromy of the Acropolis monuments presented in this paper was part of the Acropolis Restoration Service (YSMA) program (2011–2015), regarding the...

Stone has been a basic building material of different monuments and structural components such as foundations and masonry. At the same time, different types of stones have been used for decorative architectural elements, such as cornices, reliefs, colonnettes, and corbels. The maintenance of stone elements is essential for the continuity of these s...

The degradation effects of artificial aging on the “true” pigment color of Byzantine iconography are thoroughly investigated in this work. For this purpose, a multi-material palette is fabricated, consisting of various popular egg-tempera pigments, while the original recipes from the literature are utilized in order to mimic the genuine art of Byza...

The industry practice of machining hard metal parts using CNC lathe turning machines is through grinding and milling procedures. The typical practice for quality control is through manual inspection, as automated solutions are difficult to integrate in production and do not reach the same level of accuracy. In this scope, the proposed system aims t...

The core idea of the spectracoustic technique is the development and fabrication of a common probe for two modalities, the infrared spectroscopy and ultrasonic μTomography, for its application as a non-invasive analysis technique for tissue classification. The acquired and fused data from both modalities, provide a spectroscopic mapping tomographic...

The dynamic breast skin temperature evaluation is investigated in the present work for the diagnosis of breast cancer at an initial stage. In particular, a realistic breast model, including a relatively small-sized tumor, is designed and thoroughly analyzed numerically in terms of the biological heat transfer equation. Initially, the skin surface t...

The self‐healing mechanism of cementitious materials has been investigated by many researchers in the last two decades. In the journey of this quest, more and more advanced methods of analyzing the efficiency of healing have been employed. These methods are intended to clarify and quantify the healing mechanism. This paper presents five techniques,...

In this work, infrared spectroscopy, supported by acoustic microscopy, is utilized for the analysis of artworks regarding the sub-surface details. It is well-known that electromagnetic energy is able to penetrate into deeper than the surface layers as the wavelength is increased. For this reason, the infrared spectral band is capable of revealing s...

The purpose of this work is the development of a method for the acquisition of multispectral images at the infrared region on cultural heritage artworks. The infrared light is able to penetrate into deeper, to the surface, layers, especially at the mid and far infrared spectrum. To this end, Fourier-transform Infrared spectrophotometer, is utilized...

In this paper, the techniques of high-frequency ultrasound and infrared imaging are combined to enhance the sub-surface characterization of cultural heritage artworks. Initially, these two different modalities are studied independently focusing on the extraction of an art object’s stratigraphy through acoustic microscopy and the distinction of mate...

An efficient transmission line model in the micrometric order is presented in this paper, to determine the thickness of thin dielectric films deposited on highly-doped substrates. In particular, the estimation of the thickness is based on multiple reflections of an incident infrared electromagnetic wave generating interference on the sensor. To thi...

Lime-based mortars have, up to a certain extent, a self-healing capacity which may contribute to their durability. Self-healing in lime mortars consists of a process of dissolution, transport and re-precipitation of calcium compounds to heal cracks and fissures. The spontaneous occurrence of self-healing in lime-based mortars is a well-known phenom...

An efficient transmission line model, in the micrometric order, is presented in this paper, to determine the thickness of thin dielectric films deposited on highly-doped substrates. In particular, the estimation of the thickness is based on the multiple reflections of an incident infrared electromagnetic wave that generate interference on the senso...

The characterization of the surface morphology and the material layers stratigraphy is a pivotal step in several stages of the conservation process of the artwork. Generally, optimal characterization of the surface cannot be achieved using a single technique but is not always possible to find techniques that can be coupled effectively. Surface maps...

This paper presents a method of designing variable structure control systems for robots. As the on-board robot computational resources are limited, but in some cases the demands imposed on the robot by the user are virtually limitless, the solution is to produce a variable structure system. The task dependent part has to be exchanged, however the t...

Preparing traditional flooring mortars is following a well-known technique using earth, chalk, lime, pozzolana and gravel since Neolithic ages in Greece. This type of levelling compounds recently revives again, as the demands for more sustainable building materials and methods emerge imperatively. Despite their simplistic construction, traditional...

The main role of the render is to constitute an external skin of the masonry protecting it from the environmental eroding phenomena. Even though the render is a thin layer- part of the whole wall structure, the optimal application of it ensures the efficient protection of the structure from the environmental phenomena for years. The adhesion of the...

Scientific breakthroughs have led to an increase in life expectancy, to the point where senior citizens comprise an ever increasing percentage of the general population. In this direction, the EU funded RAPP project “Robotic Applications for Delivering Smart User Empowering Applications” introduces socially interactive robots that will not only phy...

It is a general truth that increase of age is associated with a level of mental and physical decline but unfortunately the former are often accompanied by social exclusion leading to marginalization and eventually further acceleration of the aging process. A new approach in alleviating the social exclusion of older people involves the use of assist...

In this work, microRaman spectroscopy is used to investigate the stratigraphic mapping in paintings. The objective of mapping imaging is to segment the dataset, here spectra, into clusters each of which consisting spectra that have similar characteristics; hence, similar chemical composition. The spatial distribution of such clusters can be illustr...

The development of non–destructive techniques is a reality in the field of conservation science. These techniques are usually not so accurate, as the analytical micro–sampling techniques, however, the proper development of soft–computing techniques can improve their accuracy. In this work, we propose a real–time fast acquisition spectroscopic mappi...

Melanoma is a very malicious type of cancer as it metastasizes early and hence its late diagnosis leads to death. Consequently, early diagnosis of melanoma and its removal is considered the most effective way of treatment. We present a design of a high frequency acoustic microscopy and infrared reflectance system for the early detection of melanoma...

3D SPECTROSCOPIC MAPPING IMAGING FOR EARLY DETECTION OF MELANOMA

Melanoma cancer has not only rapidly increased, but also is fatal due to fast metastasis. Thus, early detection is deemed crucial. The objective of the current study is to detect melanoma as early as possible combining two modalities; acoustic microscopy and infrared (IR) mapping spetcroscopy. Acoustic microscopy provides with information about the...

Medical advances have increased life expectancy to the point where senior citizens comprise a larger than ever percentage of the general population. The RAPP project introduces socially interactive robots that will not only physically assist, but also serve as a companion to senior citizens. In this paper, a novel system is presented, designed as p...

The protection of Pendelikon marbles to weathering has been the main aim of numerous and longstanding studies. Latest scientific approaches in the field of conservation include methods for self-cleaning surfaces that mimic natural phenomena. In our research, we have critically studied and implemented by means of nanotechnology, the development of a...

The objective of this study is the application of a combination of the non-invasive imaging techniques acoustic microscopy, infrared (IR) and Raman spectroscopies, in conjunction with histological and immunohistochemical analysis, for the detection, mapping and identification of developing tumors, in a novel animal model of melanoma. Acoustic micro...

Malignant melanoma is a form of skin cancer, with increasing incidence worldwide. Early diagnosis is crucial for the prognosis and treatment of the disease. The objective of this study is to develop a novel animal model of melanoma and apply a combination of the non-invasive imaging techniques acoustic microscopy, infrared (IR) and Raman spectrosco...

Abstract: The protection of Pendelikon marbles to weathering has been the main aim of numerous and longstanding studies. Latest scientific approaches in the field of conservation include methods for self-cleaning surfaces that mimic natural phenomena. In our research, we have critically studied and implemented by means of nanotechnology, the develo...

What really happens in terms of social inclusion and exclusion differentiates among European Countries, cultures and social groups and is being affected by socio-economic factors, social perceptions and societal changes. There are also variations among elderly in the European Union concerning their retirement from labor, institutionalization (resid...

Cloud robotics is becoming a trend in the modern robotics field, as it became evident that true artificial intelligence can be achieved only by sharing collective knowledge. In the ICT area, the most common way to formulate knowledge is via the ontology concept, where different meanings connect semantically. Additionally, a considerable effort to m...

Four NOD SCID male mice (NOD.CB17-Prkdcscid/NcrCrl; 22-28 g, Harlan Laboratories) were used. Under deep anesthesia, SK-MEL-28 cells (Cell Lines Service, Germany; 6x10 5 cells/injection in DMEM) were endermally injected with one week interval between each site, at three equally spaced sites of the back skin. Three, bilaterally symmetrical sites serv...

Four NOD SCID male mice (NOD.CB17-Prkdcscid/NcrCrl; 22-28 g, Harlan Laboratories) were used. Under deep anesthesia, SK-MEL-28 cells (Cell Lines Service, Germany; 6x10 5 cells/injection in DMEM) were endermally injected with one week interval between each site, at three equally spaced sites of the back skin. Three, bilaterally symmetrical sites serv...

Modern sustainable architecture indicates the use of local natural stones for building. Greek sandstones from Epirus (Demati, Greece, EN 12440) used as building facades meet aesthetic and have high mechanical properties, but the inevitable interaction between stone materials and natural or anthropogenic weathering factors controls the type, and ext...

Tablet coating thicknesses were estimated using several techniques such as weight gain and scanning electron microscopy (SEM), in comparison with acoustic microscopy and diffuse reflectance spectroscopy. Acoustic microscopy, used for the first time in such an application, is based on the physical phenomenon of ultrasound propagation through the mat...

The imperative needs of energy saving during the latest years indicate the necessity of producing hydrophobic building materials in order to increase their durability. In the frame of this experimental work, low-fired clay (roof tiles and facing bricks) have been subjected to impregnation to make them water-repellent. To achieve this, water- and so...

The transition from the traditional to the Semantic Web has proven much more difficult than initially expected. The volume, complexity and versatility of data of various domains, the computational limitations imposed on semantic querying and inferencing have drastically reduced the thrust semantic technologies had when initially introduced. In orde...

The microsampling destructions caused by the sampling of analytical spectroscopic methods are generally not permitted to art objects. Consequently, the development of nondestructive analysis techniques is a necessity. In this work we present a set of signal processing and artificial intelligence techniques which support the operation of a novel dev...

A bottom-up approach for documenting art objects processes data from innovative nondestructive analysis with signal processing and neural network techniques to provide a good estimation of the paint layer profile and pigments of artwork. The approach also uses semantic Web technologies and maps concepts relevant to the analysis of paintings and Byz...

The central church of the monastery of Christ Antiphonitis near Kalogrea, within the district of Kyrenia in Cyprus, is decorated with wall paintings that date from the last decades of fifteenth century. Two large and elaborate scenes, the Last Judgement and the Root of Jesse, had been preserved in the church until the Turkish invasion (1974) after...

A main concern for the documentation of artworks (such as paintings, miniatures, icons, manuscripts, wall paintings) is how to reveal the information that stems from the internal paint layers (stratigraphy). This information is up to now mainly acquired through analytical spectroscopic methods which require a micro-sampling operation. In the majori...

Semantic annotation and querying is currently applied on a number of versatile disciplines, providing the added-value of such an approach and, consequently the need for more elaborate – either casespecific or generic – tools. In this context, we have developed a semantically-aware tool for the description and retrieval of Byzantine Artwork Informat...

Semantic annotation and querying is currently applied on a number of versatile disciplines, providing the added-value of such an approach and, consequently the need for more elaborate - either case-specific or generic - tools. In this context, we have developed Eikonomia: an integrated semantically-aware tool for the description and retrieval of By...

In the present work, a powerful tool for the investigation of paintings is presented. This permits the tuneable multispectral real time imaging between 200 and 5000 nm and the simultaneous multispectral acquisition of spectroscopic data from the same region. We propose the term infrared reflectoscopy for tuneable infrared imaging in paintings (Chry...