cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Χωρική Στατιστική και Ανάλυση σε Χωρικά Δεδομένα Πλέγματος:
Creators: name: Λαδοπούλου, Ραφαέλα-Ειρήνη Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Μαρκοβιανά Τυχαία Πεδία
Δομή Γειτονίας
Χωρική Συσχέτιση
Markov Random Fields
Neighbor Structure
Spatial Correlation

description: Στην παρούσα εργασία ασχολούμαστε με τη στατιστική μελέτη των χωρικών δεδομένων που δίνονται στους κόμβους ενός πλέγματος. Σημαντικότερο ρόλο στη μελέτη διαδραματίζει η απόσταση που έχουν τα δεδομένα στο χώρο και η δομή γειτονίας τους. Στο πρώτο κεφάλαιο παρουσιάζονται δύο βασικά χωρικά μοντέλα, το δεσμευμένο και το από κοινού χωρικό μοντέλο, τα οποία δρουν πάνω σε Μαρκοβιανά τυχαία πεδία. Επιπλέον, μελετώνται χωριστά τα μοντέλα με διακριτά και συνεχή δεδομένα. Το επόμενο στάδιο, που αναπτύσσεται στο δεύτερο κεφάλαιο, αφορά στην εκτίμηση των παραμέτρων που χρησιμοποιήθηκαν στα αρχικά μοντέλα. Συγκεκριμένα παρουσιάζεται η εκτίμηση των παραμέτρων με τη μέθοδο της μέγιστης πιθανοφάνειας και με τη μορφή κωδικοποίησης καθώς και η εκτίμηση των παραμέτρων των Αυτοπαλινδρομούμενων μοντέλων. Στη συνέχεια γίνεται αναφορά στην τηλεανίχνευση, μια αποδοτική μέθοδο συγκέντρωσης δεδομένων σε πλέγμα, δηλαδή δεδομένων που αφορούν τους κόμβους ενός πλέγματος. Τέλος δίνονται δυο παραδείγματα με χωρικά μοντέλα, που μελετήσαμε στο πρώτο κεφάλαιο, πάνω σε πραγματικά δεδομένα.
description: This paper deals with the study of spatial statistics and particularly the study of spatial lattice data. In this study the distance between the sites and also the neighbor structure play an important role. In the first chapter, two basic spatial models are presented, the conditionally and simultaneously spatial model, which are concentrated on Markov random fields. Moreover, models in discrete and continuous data separately are studied. The next step, where is presented in the second chapter, is to estimate parameters of the previous models. Specifically estimation based on Maximum Likelihood and Coding and estimation on parameters in Autoregressive Spatial Models are presented. Later, remote sensing is referred, an efficient method of data gathering based on lattice shape. Finally, two examples concerning basic spatial models, which are studied in the first chapter, on real data are given.
Isolation, structure determination, and biosynthetic studies of secondary metabolites from Dorid Nudibranchs
Creators: name: Graziani, Edmund Idris
Publisher: name: University of British Columbia
Year: 2009

description: Investigations of the skin extracts from a number of dorid nudibranchs have led to the isolation of two novel compounds, lovenone (2) and limaciamine (8). Lovenone (2), isolated from the North Sea dorid Adalaria loveni, represents the first triterpenoid isolated from a nudibranch, and is only the second triterpenoid ever isolated from a marine mollusc. The structure of lovenone (2) was solved using a number of two-dimensional NMR techniques. Similarly, the isolation of limaciamine (8) from the North Sea dorid Limacia clavigera, represents the only naturally occurring analogue reported to date of triophamine (9). Triophamine (9) was originally isolated from the British Columbia dorids, Triopha catalinae and Polycera tricolor. [Model omitted] The isolation and structure determination of these novel compounds led directly to an investigation into the biosynthesis of secondary metabolites by dorid nudibranchs. By taking advantage of the unique biology of dorid nudibranchs, a protocol has been developed whereby multiple injections over time of [1,2-¹³C₂] acetate has afforded irrefutable proof for de novo biosynthesis in a number of dorid nudibranchs. Terpenoic acid glycerides have been isolated from skin extracts of a number of dorid nudibranchs collected worldwide. Herein is reported the first unambiguous proof for the de novo synthesis of terpenoic acid glycerides 28 and 29, isolated from Archidoris odhneri and A. montereyensis, respectively, by NMR analysis of ¹³C-¹³C coupling arising from incorporation of intact doubly labeled acetate. [Model omitted] Stable isotope incorporation studies with [1,2-¹³C₂] acetate have been used to investigate the biosynthesis of the sesquiterpenoids nanaimoal (38), acanthodoral (39), and isoacanthodoral (40) by the dorid nudibranch Acanthodoris nanaimoensis. The results have shown that: i) the sesquiterpenoids are synthesized de novo by A. nanaimoensis and ii) that a previously proposed biogenetic pathway to the isoacanthodoral skeleton was not tenable and required modification. [Model omitted] The use of stable isotope methodology has been extended to probe polyketide biosynthesis by the dorid nudibranch, Triopha catalinae. Incorporation of [1,2-¹³C₂]acetate into triophamine (9) has clearly shown the biogenesis of (9) from two units of butyrate and one unit of acetate. This work represents the first experimental evidence for de novo polyketide biosynthesis by a dorid nudibranch; moreover, the use of doubly-labeled [1,2-¹³C₂] acetate has provided clear evidence in support of one pathway where a number of biosynthetic pathways were possible.
The diffuse Galactic gamma-rays from dark matter annihilation
Creators: name: Bi, Xiao-Jun
name: Zhang, Juan
name: Yuan, Qiang
name: Zhang, Jian-Li
name: Zhao, HongSheng
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The diffuse Galactic $γ$-rays from EGRET observation shows excesses above 1 GeV in comparison with the expectations from conventional Galactic cosmic ray (CR) propagation model. In the work we try to solve the "GeV excess" problem by dark matter (DM) annihilation in the frame of supersymmetry (SUSY). Compared with previous works, there are three aspects improved in this work: first, the direction-independent "boost factor" for diffuse $γ$-rays from dark matter annihilation (DMA) is naturally reproduced by taking the DM substructures into account; second, there is no need for renormalization of the diffuse $γ$-ray background produced by CRs; last but not the least, in this work our new propagation model can give consistent results of both diffuse $γ$-rays and antiprotons, by directly adding the signals from DMA to the diffuse $γ$-ray background. This is a self-consistent model among several possible scenarios at present, and can be tested or optimized by the forthcoming experiments such as GLAST, PAMELA and AMS02.
description: 6 pages, 4 figures; the published version
Diffuse light scattering dynamics under conditions of electromagnetically induced transparency
Creators: name: Datsyuk, V. M.
name: Sokolov, I. M.
name: Kupriyanov, D. V.
name: Havey, M. D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We show that, under conditions of electromagnetically induced transparency (EIT), a significant portion of the incident probe pulse can be transferred into Rayleigh and Raman scattering channels. The light scattered into the Rayleigh channel emerges from the sample with an EIT time delay. We show that a proper description of the probe light propagation in the sample should include, in the diffusion dynamics, a spin polariton generated by the two-photon EIT process. The results have important implications for studies of weak light localization, and for manipulation of single and few photon states in ultracold atomic gases.
description: Submitted to Physical Review A
Exact solution of the six-vertex model with domain wall boundary condition. Critical line between ferroelectric and disordered phases
Creators: name: Bleher, Pavel
name: Liechty, Karl
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 82B20

description: This is a continuation of the papers [4] of Bleher and Fokin and [5] of Bleher and Liechty, in which the large $n$ asymptotics is obtained for the partition function $Z_n$ of the six-vertex model with domain wall boundary conditions in the disordered and ferroelectric phases, respectively. In the present paper we obtain the large $n$ asymptotics of $Z_n$ on the critical line between these two phases.
description: 22 pages, 6 figures, to appear in the Journal of Statistical Physics
Double Nuclear Spin Relaxation in Hybrid Quantum Hall Systems
Creators: name: Fauzi, M. H.
name: Munro, William J.
name: Nemoto, Kae
name: Hirayama, Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Recent advances in quantum engineering have given us the ability to design hybrid systems with novel properties normally not present in the regime they operate in. The coupling of spin ensembles and magnons to microwave resonators has for instance lead to a much richer understanding of collective effects in these systems and their potential quantum applications. We can also hybridize electron and nuclear spin ensembles together in the solid-state regime to investigate collective effects normally only observed in the atomic, molecular and optical world. Here we explore in the solid state regime the dynamics of a double domain nuclear spin ensemble coupled to the Nambu-Goldstone boson in GaAs semiconductors and show it exhibits both collective and individual relaxation (thermalization) on very different time scales. Further the collective relaxation of the nuclear spin ensemble is what one would expect from superradiant decay. This opens up the possibility for the exploration of novel collective behaviour in solid state systems where the natural energies associated with those spins are much less than the thermal energy.
description: 11 pages including supplementary material
Warped Gravitons at the LHC and Beyond
Creators: name: Agashe, Kaustubh
name: Davoudiasl, Hooman
name: Perez, Gilad
name: Soni, Amarjit
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the production and decay of Kaluza-Klein (KK) gravitons at the Large Hadron Collider (LHC), in the framework of a warped extra dimension in which the Standard Model (SM) fields propagate. Such a scenario can provide solutions to both the Planck-weak hierarchy problem and the flavor puzzle of the SM. In this scenario, the production via $q \bar{q}$ annihilation and decays to the conventional photon and lepton channels are highly suppressed. However, we show that graviton production via gluon fusion followed by decay to longitudinal $Z/W$ can be significant; vector boson fusion is found to be a sub-dominant production mode. In particular, the ``golden'' $ZZ$ decay mode offers a distinctive 4-lepton signal that could lead to the observation at the LHC with 300 fb$^{-1}$ (SLHC with 3 ab$^{-1}$) of a KK graviton with a mass up to $\sim 2$ ($\sim 3$) TeV for the ratio of the AdS$_5$ curvature to the Planck scale modestly above unity. We argue that (contrary to the lore) such a size of the curvature scale can still be within the regime of validity of the framework. Upgrades beyond the SLHC luminosity are required to discover gravitons heavier than $\sim 4$ TeV, as favored by the electroweak and flavor precision tests in the simplest such models.
description: 9 pages, 5 figures. Minor modifications, reference added
Limits of spatial vision in the presence and absence of fixational eye movements
Creators: name: Harmening, Wolf
name: Ratnam, Kavitha
name: Roorda, Austin
name: Domdei, Niklas
Publisher: name: F1000Research
Year: 2015

description: In human vision due to constant eye motion – retinal images are being translated across multiple receptors at all times, yielding spatio-temporal information to be included in the sampling process. To what degree is this information employed during high acuity and hyperacuity tasks?

We used an adaptive optics scanning laser ophthalmoscope (AOSLO) to image the retina and deliver aberration corrected visual stimuli at high levels of retinal contingency. During sustained fixation, subjects were randomly presented with stimuli shown in either retinally stabilized or normal viewing conditions at specific retinal locations for 750 msec, with stimulus feature size below the Nyquist sampling limit. In acuity experiments, all subjects performed significantly worse in the stabilized condition, with a mean performance drop of ~23%. Performance was unchanged during hyperacuity tasks.

Conclusion: Fixational eye movements facilitate discrimination in acuity but not in hyperacuity tasks. Stimulus motion does not need to be congruent with own eye motion.
Παραμετρική εκτίμηση της σεισμικής επικινδυνότητας στον ευρύτερο χώρο του Αιγαίου με τη χρήση ημι-Μαρκοβιανών αλυσίδων:
Creators: name: Περτσινίδου, Χριστίνα-Ελισάβετ Θεόφιλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Ημι-Μαρκοβιανές αλυσίδες
Πιθανότητες πρώτης εισόδου
Χρόνοι πρώτης εισόδου
Semi-Markov chains
First hitting time probabilities
First hitting times

description: Στόχος της παρούσας διπλωματικής εργασίας είναι η παραμετρική εκτίμηση της σεισμικής επικινδυνότητας στην ευρύτερη περιοχή του Αιγαίου με τη χρήση ημι-Μαρκοβιανών αλυσίδων. Στα κεφάλαια 1 και 2 μελετώνται οι χρόνοι πρώτης εισόδου και οι πιθανότητες πρώτης εισόδου σε Μαρκοβιανές και ημι-Μαρκοβιανές αλυσίδες. Στο κεφάλαιο 3 γίνεται η μελέτη της προσαρμογής της γεωμετρικής κατανομής στους χρόνους παραμονής που προκύπτουν από ένα σύνολο δεδομένων που αποτελείται από σεισμούς από τον ευρύτερο χώρο του Αιγαίου και επίσης υπολογίζονται οι χρόνοι πρώτης εισόδου και οι πιθανότητες πρώτης εισόδου. Στο κεφάλαιο 4 προτείνεται η υπολογιστική εκτίμηση των παραμέτρων της διακριτής Weibull κατανομής και γίνεται μελέτη της προσαρμογής της κατανομής στο ίδιο σύνολο δεδομένων. Επίσης, υπολογίζονται οι χρόνοι πρώτης εισόδου και οι πιθανότητες πρώτης εισόδου. Από τη σύγκριση των κατανομών και από τις προσομοιώσεις ημι-Μαρκοβιανών αλυσίδων διατυπώνονται κάποια συμπεράσματα και προτάσεις. Στο παράρτημα βρίσκονται όλα τα προγράμματα που χρειάστηκε να κατασκευάσουμε στα πλαίσια της παραπάνω μελέτης.
description: In this thesis we perform via a parametric estimation a seismic hazard assessment of the Aegean and the surrounding area, using the semi-Markov chains. In chapters 1 and 2 the first hitting times and the first hitting time probabilities in Markov and semi-Markov chains are presented. In the 3rd chapter we study the adaption of the geometric distribution for the sojourn times of a dataset of earthquakes from the Aegean and the surrounding areas. First hitting times and first hitting time probabilities are also computed. In the 4th chapter a computational estimation of the discrete Weibull distribution parameters is proposed and the adaption of this distribution for the same dataset is also studied. Furthermore, first hitting times and first hitting time probabilities are computed. Finally, by the above study, general and theoretical results are obtained. In the appendix all the programs that we constructed for the needs of the above study, are presented.
Discovering key topics from short, real-world medical inquiries via natural language processing and unsupervised learning
Creators: name: Ziletti, Angelo
name: Berns, Christoph
name: Treichel, Oliver
name: Weber, Thomas
name: Liang, Jennifer
name: Kammerath, Stephanie
name: Schwaerzler, Marion
name: Virayah, Jagatheswari
name: Ruau, David
name: Ma, Xin
name: Mattern, Andreas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Computation and Language (cs.CL)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Millions of unsolicited medical inquiries are received by pharmaceutical companies every year. It has been hypothesized that these inquiries represent a treasure trove of information, potentially giving insight into matters regarding medicinal products and the associated medical treatments. However, due to the large volume and specialized nature of the inquiries, it is difficult to perform timely, recurrent, and comprehensive analyses. Here, we propose a machine learning approach based on natural language processing and unsupervised learning to automatically discover key topics in real-world medical inquiries from customers. This approach does not require ontologies nor annotations. The discovered topics are meaningful and medically relevant, as judged by medical information specialists, thus demonstrating that unsolicited medical inquiries are a source of valuable customer insights. Our work paves the way for the machine-learning-driven analysis of medical inquiries in the pharmaceutical industry, which ultimately aims at improving patient care.
Exit asymptotics for small diffusion about an unstable equilibrium
Creators: name: Bakhtin, Yuri
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 60H10

description: A dynamical system perturbed by white noise in a neighborhood of an unstable fixed point is considered. We obtain the exit asymptotics in the limit of vanishing noise intensity. This is a refinement of a result by Kifer (1981).
description: 13 pages
The non linear Bass diffusion model on Renewable Energy Technologies in European countries:
Creators: name: Δίγκα, Πασχαλία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Μοντέλο διάδοσης του Bass
Τεχνολογίες ανανεώσιμων πηγών ενέργειας
Προβλέψεις
Bass diffusion model
Renewable energy technologies
Forecasting

description: Σε αυτή την εργασία παρουσιάζεται μια επισκόπηση της ευρωπαϊκής και παγκόσμιας αγοράς ενέργειας ανανεώσιμων πηγών και ειδικότερα η εφαρμογή ενός μη γραμμικού μοντέλου, ως μοντέλο αύξησης, έτσι ώστε να επιβεβαιωθεί η ακρίβεια και η επάρκειά του για να δημιουργήσει προβλέψεις για την παραγωγή ενέργειας. Το μοντέλο διάχυσης Bass είχε την καλύτερη προβλεπτική απόδοση από τα άλλα μοντέλα αύξησης που δοκιμάστηκαν, και κατά συνέπεια αυτό επιλέχθηκε να χρησιμοποιηθεί και να αναλυθεί. Ως αποτέλεσμα, προβλέπεται εκτός δείγματος η παραγωγή ενέργειας για ορίζοντα 10ετίας, μέσω τεχνικών προσομοίωσης για σημειακές προβλέψεις και διαστήματα πρόβλεψης, έως το 2020, για τέσσερις τεχνολογίες ανανεώσιμων πηγών ενέργειας, τα πεπιεσμένα και οργανικά απόβλητα, ηλιακή, αιολική και γεωθερμική τεχνολογία σε ορισμένες ευρωπαϊκές χώρες. Το κύριο ερώτημα που αναμένεται να απαντηθεί είναι εάν το προϊόν (παραγωγή ενέργειας), σε κάθε χώρα που μελετήθηκε, έχει φτάσει στο μέγιστο επίπεδο διείσδυσής του στην αγορά, έτσι ώστε να καθοριστεί η ενεργειακή πολιτική ή να βρεθούν ενδεχόμενες ευκαιρίες ανάπτυξης στην αγορά ανανεώσιμων πηγών ενέργειας.
description: In this thesis is presented an overview of the European and global renewable energy market and more specifically an application of a non linear model, as a growth model, so as to provide enough evidence for its accuracy and adequacy to generate energy production forecasts. The Bass diffusion model had the better forecasting performance than the other growth models that were tested, and it is consequently selected to be used. The energy production is forecasted out-of-sample for a 10-year-ahead horizon through simulation techniques for point forecasts, until 2020, for four renewable energy technologies, combustibles and waste, solar, wind and geothermal, in some European countries. The main question that is expected to be answered is if the product (energy production), in each country studied, has reached its maximum penetration level in order the energy policy to be set or market opportunities for development to be found.
Proto-Clusters with Evolved Populations around Radio Galaxies at z~2.5
Creators: name: Kajisawa, Masaru
name: Kodama, Tadayuki
name: Tanaka, Ichi
name: Yamada, Toru
name: Bower, Richard
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report a discovery of proto-cluster candidates around high redshift radio galaxies at z~2.5 on the basis of clear statistical excess of colour-selected galaxies around them seen in the deep near-infrared imaging data obtained with CISCO on Subaru Telescope. We have observed six targets, all at similar redshifts at z~2.5, and our data reach to J=23.5, H=22.6 and K=21.8 (5 sigma) and cover a 1.6' x 1.6' field centered on each radio galaxy. We apply colour cuts in JHKs in order to exclusively search for galaxies located at high redshifts, z>2. Over the magnitude range of 19.52.3 by a factor of two around the combined radio galaxies fields compared to those found in the general field of GOODS South. The excess of galaxies around the radio galaxies fields becomes more than factor of three around 19.5
description: 7 pages, 4 figures, accepted for publication in MNRAS
Homoscedastic controlled calibration model
Creators: name: Achic, Betsabé G. Blas
name: Sandoval, Mônica C.
name: Yoshida, Olga Satomi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: In the context of the usual calibration model, we consider the case in which the independent variable is unobservable, but a pre-fixed value on its surrogate is available. Thus, considering controlled variables and assuming that the measurement errors have equal variances we propose a new calibration model. Likelihood based methodology is used to estimate the model parameters and the Fisher information matrix is used to construct a confidence interval for the unknown value of the regressor variable. A simulation study is carried out to asses the effect of the measurement error on the estimation of the parameter of interest. This new approach is illustrated with an example.
description: LaTex, 21 pages. Includes 13 tables. Version published in Journal of Chemometrics, v. 21, p. 145-155, 2007
Κινητό και Τοποκεντρικό Εμπόριο: Μελλοντικές Τάσεις – Πειραματική Έρευνα και Ανάπτυξη Κινητής Εφαρμογής.:
Creators: name: Καλού, Αναστασία Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Κινητή Υπολογιστική
Κινητό Εμπόριο
Τοποκεντρικό Εμπόριο
Mobile Computing
Mobile Commerce
Location Based Commerce

description: Η παρούσα διπλωματική εργασία συγκροτείται από τρία βασικά μέρη, τη βιβλιογραφική έρευνα, την πειραματική μελέτη και την πρακτική εφαρμογή. Το πρώτο μέρος επικεντρώνεται στις δυνατότητες που προσφέρει η κινητή υπολογιστική και τις ευκαιρίες που προφέρουν οι κινητές τοποκεντρικές υπηρεσίες στο εμπόριο. Παράλληλα, γίνεται ανάλυση της παγκόσμιας αγοράς της κινητής υπολογιστικής και των τάσεων που φαίνεται να διαμορφώνει εξελίσσοντας την φύση του παραδοσιακού εμπορίου. Στην πειραματική μελέτη συμμετείχαν φοιτητές του Οικονομικού τμήματος του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης και αποτέλεσε στοιχείο ενδοσκόπησης της ελληνικής αγοράς της κινητής υπολογιστικής και των αντίστοιχων τάσεων που διαφαίνονται. Επιπροσθέτως, η έρευνα επικεντρώνεται στη χρήση εφαρμογών κινητών τρίτης γενιάς και αξιολόγηση της συμπεριφοράς των χρηστών ή δυνητικών χρηστών προς τις εφαρμογές βάση τοποθεσίας. Το τελευταίο μέρος της παρακάτω διπλωματικής εργασίας αφορά την πρακτική εφαρμογή και συγκεκριμένα την ανάπτυξη μίας τοποκεντρικής εφαρμογής. Οι κύριες υπηρεσίες που προσφέρει είναι ο εντοπισμός της θέσης του χρήστη και την εμφάνιση πάνω στον χάρτη τοποθεσιών – πληροφοριών.
description: This dissertation is consisted of three main parts, literature research, experimental study and practice. The first part focuses on the potential of mobile computing and the opportunities of the location based services in trade. Furthermore, there is an analysis of the global market of mobile computing and the trends which seem to be shaping the nature of traditional trade. The experimental study inspects the Greek market of mobile computing and respectively the emerging trends, and involved students in Economics from the Aristotle University of Thessaloniki. Furthermore, the research focuses on the use of the smartphone applications and evaluates the behavior of users or potential users to LBS applications. The last part of the following thesis is concerns the development of a location based application. The main services offered are to identify the user's location and display it on the map sites - information.
Research protocol. Primary Care Physician eHealth profile and burnout: an international cross sectional study
Creators: name: Jendly, Mathieu
name: Santschi, Valérie
name: Tancredi, Stefano
name: von Wyl, Viktor
name: Chiolero, Arnaud
Publisher: name: Zenodo
Year: 2024

description: Digital health (eHealth) tools are becoming increasingly prevalent in healthcare systems. They hold the potential to enhance workflow efficiency and improve patient care. However, they may also increase administrative workload and contribute to stress among physicians. The relationship between digital health and physician burnout remains unclear, despite growing concerns about burnout’s significant impact on healthcare quality and patient outcomes. The aim of this analysis is to use data from a cross-sectional study to provide an international ranking of the use of digital health and burnout among primary care physicians, as well as the relationship between the two.
Erkennung menschlicher Aktivitäten durch Erfassung und Analyse von Bewegungstrajektorien
Creators: name: Back, Kristine
Publisher: name: KIT Scientific Publishing
Year: 2019
Subjects: Bildverarbeitung
Maschinelles Lernen
Körpertracking
Aktivitätserkennung
Image Processing
Machine Learning
Pose Estimation
Human Activity Recognition

description: Das Verstehen menschlichen Verhaltens ist essenziell für intelligente technische Systeme in menschlichen Umgebungen. Diese Arbeit befasst sich mit der videobasierten Aktivitätsanalyse. Dazu werden zwei Methoden der Merkmalsextraktion untersucht: ein markerloses dreidimensionales Körpertracking mit einem evolutionären Algorithmus und ein modellfreies Tracking dynamischer Videomerkmale. Anschließend erfolgt eine Modellierung und Klassifikation von Aktivitäten auf Basis der gewonnenen Merkmale.
A Search for the Rare Leptonic Decays B+ -> mu+ nu and B+ -> e+ nu
Creators: name: Satoyama, N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a search for the decays B+ -> mu+ nu_mu and B+ -> e+ nu_e in a 253 fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy B factory. We find no significant evidence for a signal and set 90% confidence level upper limits of B(B+ -> mu+ nu_mu) < 1.7 x 10^{-6} and B(B+ -> e+ nu_e) < 9.8 x 10^{-7}.
description: 13 pages, 10 figures, accepted to Phys. Lett. B
Nanoantennas Design for THz Communication: Material Selection and Performance Enhancement
Creators: name: Dash, Sasmita
name: Liaskos, Christos
name: Akyildiz, Ian F.
name: Pitsillides, Andreas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In the development of terahertz (THz) communication systems, the nanoantenna is the most significant component. Especially, the focus is to design highly directive antennas, because it enhances the performance of the overall system by compensating the large path loss at THz and thus improves the signal-to-noise ratio. This paper presents suitable material for nanoantenna design and the advancement in their performance for THz communications. Copper, Graphene, and carbon nanotube materials are used as promising candidates for nanoantenna design. The performance of nanoantennas is carried out by analyzing the properties and behavior of the material at THz. Results show that the Graphene nanoantenna provides better performance in terms of miniaturization, directivity, and radiation efficiency. Further, the performance enhancement of the nanoantenna at THz is studied by dynamically adjusting the surface conductivity via the chemical potential of Graphene using the electric field effect. The performance of the nanoantenna is enhanced in terms of high miniaturization, high directivity, low reflection, frequency reconfiguration, and stable impedance. The THz nanoantennas using Graphene have the potential to be used for THz communication systems. In view of the smart THz wireless environment; this paper finally presents a THz Hypersurface using Graphene meta-atoms. The user-side Graphene nanoantennas and environment-side Graphene Hypersurface can build a promising smart THz wireless environment.
Η αμερικανική σχολή υποκριτικής εκπαίδευσης:
Creators: name: Παλίλης, Μιχάλης Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Αμερικανική υποκριτική εκπαίδευση
American Acting education

description: Η μελέτη της αμερικάνικης σχολής εκπαίδευσης ηθοποιών αποτελεί μια δυναμική διαδικασία που έχει τις ρίζες της σε προηγούμενες επιρροές. Το ζητούμενο της εργασίας αυτής είναι να ανακαλύψει την πορεία αυτής της διαδρομής και να συγκρίνει τις κύριες διδασκαλίες των εκφραστών της. Επιδιώκει να κατανοήσει τις θεωρίες αυτής της σχολής και να διαπιστώσει τον βαθμό διαφοροποίησής τους από τον κύριο παράγοντα που τις διαμόρφωσε, από το Σύστημα Stanislavski. H αρχή της εργασίας προσπαθεί να παρουσιάσει το νήμα αυτής της διαδρομής. Στη συνέχεια παρουσιάζoνται συνοπτικά το Σύστημα Stanislavski, η Μέθοδος και οι διδασκαλίες των κύριων εκφραστών της, Lee Strasberg, Stella Adler και Sanford Meisner. Κατόπιν, παρουσιάζονται η κριτική που έχει ασκηθεί στην Mέθοδο, και οι αρχές ενός πολέμιού της που εκφράζει μια σύγχρονη αντίληψη περί της υποκριτικής, του David Mamet. Η εργασία ολοκληρώνεται με τη σύγκριση των κυρίαρχων παραμέτρων που συνιστούν το φαινόμενο της υποκριτικής στην αμερικάνικη σχολή εκπαίδευσης.
description: The study of american actors’ training school is a dynamic process that has its roots in earlier influences. The aim of this thesis is to discover the course of this journey, and to compare the main teachings of its exponents. It seeks to understand the theories of this school and to find the degree of differentiation from the main factor configuration, the System Stanislavski. At the beginning, the thesis tries to present the thread of this route. Then, follows a brief presentation of the Stanislavski System, the Method and the teachings of the main modulators of the Method, meaning Lee Strasberg, Stella Adler and Sanford Meisner. After, the thesis presents the criticism that the Method has received, and the main principles of an opponent of the Method that expresses a modern approach to drama, the teachings of David Mamet. The thesis concludes with a comparison of the dominant parameters that constitute the phenomenon of acting in American acting education..
Access Control, Key Management, and Trust for Emerging Wireless Body Area Networks
Creators: name: Salehi Shahraki, Ahmad
name: Lauer, Hagen
name: Grobler, Marthie
name: Sakzad, Amin
name: Rudolph, Carsten
Publisher: name: Monash University
Year: 2024
Subjects: classificationCode: 460407
subject: System and network security
classificationCode: 460904
subject: Information security management
classificationCode: 460609
subject: Networking and communications
classificationCode: 460402
subject: Data and information privacy

description: Wireless Body Area Networks (WBANs) are an emerging industrial technology for monitoring physiological data. These networks employ medical wearable and implanted biomedical sensors aimed at improving quality of life by providing body-oriented services through a variety of industrial sensing gadgets. The sensors collect vital data from the body and forward this information to other nodes for further services using short-range wireless communication technology. In this paper, we provide a multi-aspect review of recent advancements made in this field pertaining to cross-domain security, privacy, and trust issues. The aim is to present an overall review of WBAN research and projects based on applications, devices, and communication architecture. We examine current issues and challenges with WBAN communications and technologies, with the aim of providing insights for a future vision of remote healthcare systems. We specifically address the potential and shortcomings of various Wireless Body Area Network (WBAN) architectures and communication schemes that are proposed to maintain security, privacy, and trust within digital healthcare systems. Although current solutions and schemes aim to provide some level of security, several serious challenges remain that need to be understood and addressed. Our aim is to suggest future research directions for establishing best practices in protecting healthcare data. This includes monitoring, access control, key management, and trust management. The distinguishing feature of this survey is the combination of our review with a critical perspective on the future of WBANs.
Overlooked astrophysical signatures of axion(-like) particles
Creators: name: Zioutas, K.
name: Tsagri, M.
name: Semertzidis, Y.
name: Papaevangelou, Th.
name: Nordt, A.
name: Anastassopoulos, V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The working principle of axion helioscopes can be behind unexpected solar X-ray emission, being associated with solar magnetic fields, which become the catalyst. Solar axion signals can be transient brightenings as well as continuous radiation. The energy range below 1 keV is a window of opportunity for direct axion searches. (In)direct signatures support axions or the like as an explanation of striking behaviour of X-rays from the Sun.
description: 17 pages, 7 figures, extended proc. IDM2006, X-ray brightenings of non-flaring Sun, solar disk centre crossings
Interactions of a shock with a molecular cloud at various stages of its evolution due to thermal instability and gravity
Creators: name: Kupilas, M. M.
name: Wareing, C. J.
name: Pittard, J. M.
name: Falle, S. A. E. G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using the adaptive mesh refinement code MG, we perform hydrodynamic simulations of the interaction of a shock with a molecular cloud evolving due to thermal instability and gravity. To explore the relative importance of these processes, three case studies are presented. The first follows the formation of a molecular cloud out of an initially quiescent atomic medium due to the effects of thermal instability and gravity. The second case introduces a shock whilst the cloud is still in the warm atomic phase, and the third scenario introduces a shock once the molecular cloud has formed. The shocks accelerate the global collapse of the clouds with both experiencing local gravitational collapse prior to this. When the cloud is still atomic, the evolution is shock dominated and structures form due to dynamical instabilities within a radiatively cooled shell. While the transmitted shock can potentially trigger the thermal instability, this is prevented as material is shocked multiple times on the order of a cloud crushing time-scale. When the cloud is molecular, the post-shock flow is directed via the pre-existing structure through low-density regions in the inter-clump medium. The clumps are accelerated and deformed as the flow induces clump-clump collisions and mergers that collapse under gravity. For a limited period, both shocked cases show a mixture of Kolmogorov and Burgers turbulence-like velocity and logarithmic density power spectra, and strongly varying density spectra. The clouds presented in this work provide realistic conditions that will be used in future feedback studies.
Twisting K3 x T^2 Orbifolds
Creators: name: Cvetic, Mirjam
name: Liu, Tao
name: Schulz, Michael B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We construct a class of geometric twists of Calabi-Yau manifolds of Voisin-Borcea type (K3 x T^2)/Z_2 and study the superpotential in a type IIA orientifold based on this geometry. The twists modify the direct product by fibering the K3 over T^2 while preserving the Z_2 involution. As an important application, the Voisin-Borcea class contains T^6/(Z_2 x Z_2), the usual setting for intersecting D6 brane model building. Past work in this context considered only those twists inherited from T^6, but our work extends these twists to a subset of the blow-up modes. Our work naturally generalizes to arbitrary K3 fibered Calabi-Yau manifolds and to nongeometric constructions.
description: 57 pages, 4 figures; uses harvmac.tex, amssym.tex; v3: minor corrections, references added
A Discussion on Context-awareness to BetterSupport the IoT Cloud/Edge Continuum
Creators: name: Silva, Daniel M. A.
name: Sofia, Rute C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: This paper debates on notions of context-awareness as a relevant asset of networking and computing architectures for an Internet of Things (IoT), in particular in regards to a smoother support of the the networking operation between Cloud and Edge. Specifically, the paper debates on notions of context-awareness and goes over different types of context-awareness indicators that are being applied to Edge selection algorithms, covering the approaches currently used, the role of the algorithms applied, their scope, and contemplated performance metrics. Lastly, the paper provides guidelines for future research in the context of Cloud-Edge and the application of context-awareness to assist in a higher degree of automation of the network and, as consequence, a better support of the Cloud to Edge continuum.
Εφαρμογή τεχνικών Data Mining με τον SQL Server 2012 και την γλώσσα R:
Creators: name: Κολιόπουλος, Φοίβος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Εξόρυξη Δεδομένων
Βάσεις Δεδομένων
Αποθήκες Δεδομένων
Δένδρα Απόφασης
Αλγόριθμοι Ταξινόμησης
Κανόνες Απόφασης
Συσταδοποίηση
Αλγόριθμοι Συσταδοποίησης
Αξιολόγηση μοντέλων πρόβλεψης
Data Mining
Data Warehousing
OLAP
Mining tools
SQL Server 2012
R language
Rattle package
Decision trees
Clustering
Mining model evaluation

description: Στην κοινωνία της πληροφορίας του 21ου αιώνα, η μετατροπή των δεδομένων σε πληροφορία είναι αναγκαίο να οδηγεί και την μετατροπή της πληροφορίας σε γνώση. Ένα από τα μεγαλύτερα και ανερχόμενα σε σπουδαιότητα και δυσκολία πεδία είναι η ανακάλυψη προτύπων και μοντέλων σε τεράστια σύνολα δεδομένων. Η επιστήμη αυτή, η οποία συμπεριλαμβάνει μία πληθώρα άλλων επιστημονικών πεδίων, όπως της στατιστικής, της μηχανικής μάθησης και της θεωρίας της πληροφορίας, ονομάζεται «Εξόρυξη Πληροφορίας από Δεδομένα». Στα πλαίσια του Διατμηματικού Μεταπτυχιακού Προγράμματος Σπουδών «Πληροφορική & Διοίκηση», πραγματοποιήθηκε η εκπόνηση αυτής της εργασίας με σκοπό την εφαρμογή τεχνικών Data Mining σε σύνολα δεδομένων πού αφορούν κινηματογραφικές ταινίες, με εφαρμογή μεθόδων επεξεργασίας δεδομένων, κανόνων συσχέτισης και αλγορίθμων κατηγοριοποίησης στο περιβάλλον του SQL Server 2012 και της γλώσσας R. Κύριος κορμός αυτής της εργασίας είναι η εφαρμογή διαφόρων αλγορίθμων στα σύνολα δεδομένων, η παρουσίαση των αποτελεσμάτων τους στα παραπάνω περιβάλλοντα και η σύγκριση τους ως προς την ακρίβεια των αποτελεσμάτων.
description: In the so-called ‘information society’ of the 21st century, the transformation of data into information should also lead to the transformation of information into knowledge. One of the most significant, arising and challenging research areas is the formation of patterns and models in large datasets. This scientific area, which includes several other scientific areas like Statistics, Computational Intelligence and Information Theory, is called “Data Mining”. This Dissertation has been elaborated as part of the Interdisciplinary Post-Graduate Program of Studies "Information & Management" and its goal is the application of Data Mining techniques in datasets regarding cinema movies, with the application of data processing methods and classification algorithms in a SQL Server 2012 environment and with R language. The main body of this Dissertation covers the application of different algorithms in datasets, the presentation of their results in SQL Server 2012 environment and the comparison of the results regarding their accuracy.
Access Control, Key Management, and Trust for Emerging Wireless Body Area Networks
Creators: name: Salehi Shahraki, Ahmad
Publisher: name: Monash University
Year: 2024
Subjects: classificationCode: 460407
subject: System and network security
classificationCode: 460904
subject: Information security management
classificationCode: 460609
subject: Networking and communications
classificationCode: 460402
subject: Data and information privacy

description: Wireless Body Area Networks (WBANs) are an emerging industrial technology for monitoring physiological data. These networks employ medical wearable and implanted biomedical sensors aimed at improving quality of life by providing body-oriented services through a variety of industrial sensing gadgets. The sensors collect vital data from the body and forward this information to other nodes for further services using short-range wireless communication technology. In this paper, we provide a multi-aspect review of recent advancements made in this field pertaining to cross-domain security, privacy, and trust issues. The aim is to present an overall review of WBAN research and projects based on applications, devices, and communication architecture. We examine current issues and challenges with WBAN communications and technologies, with the aim of providing insights for a future vision of remote healthcare systems. We specifically address the potential and shortcomings of various Wireless Body Area Network (WBAN) architectures and communication schemes that are proposed to maintain security, privacy, and trust within digital healthcare systems. Although current solutions and schemes aim to provide some level of security, several serious challenges remain that need to be understood and addressed. Our aim is to suggest future research directions for establishing best practices in protecting healthcare data. This includes monitoring, access control, key management, and trust management. The distinguishing feature of this survey is the combination of our review with a critical perspective on the future of WBANs.
Ο ορισμός της διεθνούς τρομοκρατίας:
Creators: name: Δερμεντζόπουλος, Χρήστος Αλέξανδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Διεθνής τρομοκρατία
Γενική συνέλευση
Συμβούλιο ασφαλείας
Terrorism
United nations
Patriot act

description: Η συγκεκριμένη διπλωματική πραγματεύεται το ζήτημα της απόδοσης ενός ορισμού για το φαινόμενο της διεθνούς τρομοκρατίας. Επιπρόσθετα παρουσιάζεται περιληπτικά και ο τρόπος δράσης για την αντιμετώπιση της διεθνούς τρομοκρατίας. Στο Α κεφάλαιο υπάρχει η ιστορική αναδρομή της διεθνούς τρομοκρατίας με τις σημαντικότερες εκδηλώσεις της, τις μορφές εκδηλωσής της και την αντιπαραβολή του φαινομένου με τα απελευθερωτικά κινήματα. Στο ΄Β κεφάλαιο υπάρχει το ζήτημα ορισμού του φαινομένου της τρομοκρατίας, πως δηλαδή αρχικά ασχολήθηκε η Γενική Συνέλευση αλλά και το γεγονός οτι πλέον το Συμβούλιο Ασφαλειάς συνεισφέρει στην ίδια προσπάθεια. Τέλος στο Γ και Δ κεφάλαιο υπάρχουν οι προσπάθειες των προαναφερωμένων οργάνων για την καταπολέμηση του φαινομένου της διεθνούς τρομοκρατίας.
description: This particular thesis is dealing with the matter of defining the phenomenon of international terrorism. Additionally briefly summarizes the actions which have taken part in order to combat this phenomenon. In the Chapter A there is the historical background with major events of terrorism, forms and the comparison with the liberation movements. In Chapter B there is the question of the definition, which was addressed mainly from the General Assembly and the Security Council. Finally, in chapter C and D the reader can see the efforts of those organizations to face this phenomenon.
Σχεδίαση τυπωμένης κεραίας σάρωσης με δομή μεταϋλικού:
Creators: name: Συμεωνίδου, Αθανασία Θεολόγου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: μικροταινιακή κεραία
μεταϋλικά
σάρωση λοβού
microstrip antenna
metamaterials
beam scan

description: Η παρούσα διπλωματική εργασία πραγματεύεται τη σχεδίαση μικροταινιακής κεραίας για φορητές συσκευές επικοινωνίας στην περιοχή των 2.4 GHz με δυνατότητα ελέγχου της διεύθυνσης μέγιστης εκπομπής της κεραίας με λειτουργικό τρόπο και σε πραγματικό χρόνο. Η κεραία είναι περιοδική δομή όμοιων κυψελίδων και η σύνθεσή της βασίζεται στην προσέγγιση της θεωρίας των τεχνητών μεταϋλικών με τη θεωρία γραμμών μεταφοράς. Η εργασία διαρθρώνεται σε έξι κεφάλαια. Στο πρώτο κεφάλαιο της εργασίας γίνεται η περιγραφή των μεταϋλικών, αναδρομή στην ιστορική τους εξέλιξη, παρατίθενται εφαρμογές τους, καθώς και η μέθοδος προσέγγισής τους με τη θεωρία των γραμμών μεταφοράς. Στο δεύτερο κεφάλαιο γίνεται μια ανασκόπηση των μικροταινιακών κεραιών περιγράφοντας τα βασικά χαρακτηριστικά, τις τεχνικές τροφοδοσίας και τα πλεονεκτήματα και μειονεκτήματα τους. Στο τρίτο κεφάλαιο παρουσιάζεται αναλυτικά η μέθοδος σχεδίασης της προτεινόμενης μικροταινιακής κεραίας από τη σχεδίαση της μοναδιαίας γραμμής μεταφοράς (1 cell) μέχρι την τελική προτεινόμενη κεραία. Στο τέταρτο κεφάλαιο παρατίθενται τα αποτελέσματα των προσομοιώσεων της κεραίας που σχεδιάστηκε και αναδεικνύεται η λειτουργία της δομής ως μεταϋλικό. Στο πέμπτο κεφάλαιο παρουσιάζονται συνοπτικά τα αποτελέσματα των προσομοιώσεων εναλλακτικών δομών και γίνεται σύγκριση με την προτεινόμενη δομή του κεφαλαίου 4. Τέλος, στο τελευταίο κεφάλαιο γίνεται μια συνοπτική περιγραφή της εργασίας αυτής και προτείνονται θέματα για μελλοντική έρευνα.
description: The aim of this thesis is to design microstrip antenna for mobile communication devices in the 2.4 GHz band with the ability to control the direction of the maximum emission of the antenna operationally and in real time. The antenna consists of a repetitive periodic structure synthesized via the approach of artificial metamaterials to the theory of transmission lines. Chapter 1 introduces the idea of metamaterials, gives a recursion in their historical development, while some applications are listed. Also, the approach of metamaterials according to the theory of transmission lines is described. Chapter 2 is devoted to microstrip patch antennas. Their basic characteristics, the most common feeding techniques, as well as their advantages and disadvantages are listed. Chapter 3 presents analytically the method followed to design the microstrip antenna from scratch. Starting with the design of the unit transmission line (1 cell) until the final proposed antenna. Chapter 4 discusses the results of the simulations of the antenna designed and enhances the function of the structure as a metamaterial. Chapter 5 summarizes the results of the simulations of some alternative structures and compares the results with the proposed structure of Chapter 4. Finally, Chapter 6 summarizes the conclusions of this thesis and the research made and suggests topics for future research.