cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fermion Fractionalization to Majorana Fermions in Dimerized Kitaev Superconductor
Creators: name: Wakatsuki, Ryohei
name: Ezawa, Motohiko
name: Tanaka, Yukio
name: Nagaosa, Naoto
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study theoretically a one-dimensional dimerized Kitaev superconductor model which belongs to BDI class with time-reversal, particle-hole, and chiral symmetries. There are two sources of the particle-hole symmetry, i.e., the sublattice symmetry and superconductivity. Accordingly, we define two types of topological numbers with respect to the chiral indices of normal and Majorana fermions, which offers an ideal laboratory to examine the interference between the two different physics within the same symmetry class. Phase diagram, zero-energy bound states, and conductance at normal metal/superconductor junction of this model are unveiled from this viewpoint. Especially, the electron fractionalization to the Majorana fermions showing the splitting of the local density of states is realized at the soliton of the dimerization in this model.
description: 12 pages, 13 figures
Galaxy-Classification Activity for All Ages
Creators: name: Cooksey, Kathy L.
name: Metevier, Anne J.
name: Rubin, Kate H. R.
name: Choi, Philip I.
name: Raschke, Lynne
Publisher: name: arXiv
Year: 2022
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: Classification is a general tool of science; it is used to sort and categorize biological organisms, chemical elements, astronomical objects, and many other things. In scientific classification, taxonomy often reflects shared physical properties that, in turn, may indicate shared origins and/or evolution. A "hands-on" galaxy-classification activity developed and implemented by Professional Development Program (PDP) participants, for a high-school summer STEM enrichment program, has been adopted for various age groups and venues, from young (K-3) to college students. We detail the basic tools required, outline the general activity, and describe the modifications to the activity based on learners' ages and learning objectives. We describe the facilitation strategies learned through PDP training and used when implementing the activity, including prompts to motivate the students. We also discuss how we connected the classification process to astronomy and science more broadly during the concluding remarks.
description: 17 pages, 4 figures; in S. Seagroves, A. Barnes, A.J. Metevier, J. Porter, & L. Hunter (Eds.), Leaders in effective and inclusive STEM: Twenty years of the Institute for Scientist & Engineer Educators. UC Santa Cruz: Institute for Scientist & Engineer Educators; see https://escholarship.org/uc/isee_pdp20yr
Is there evidence for intelligence-by-conscientiousness interaction in the prediction of change in school grades from age 11 to 15 years?
Creators: name: Hufer-Thamm, Anke
name: Starr, Alexandra
name: Steinmayr, Ricarda
Publisher: name: TU Dortmund
Year: 2023
Subjects: subject: School grades
subject: Educational success
subject: Intelligence-personality interaction
subject: Cognitive abilities
subject: Conscientiousness
subject: 150
subject: Notengebung |
subject: Lernerfolg |
subject: Intelligenz |
subject: Kognitive Kompetenz |
subject: Schüler |
subject: Schülerin |

description: Fluid intelligence and conscientiousness are the most important predictors of school grades. In addition to this main effect, researchers have suggested that the two traits might also interact with each other in the prediction of school success. A synergistic and a compensatory form of interaction have been suggested, but past evidence has been mixed so far. Most previous studies on this subject have been cross-sectional and many of them focused on older adolescents or adults in upper secondary school or university. We thus investigated the main and interaction effects of fluid intelligence and conscientiousness on school grades in math and German in a longitudinal sample of 1043 German students from age 11 to 15 years. Results from latent growth curve models with latent interaction terms showed a small compensatory interaction effect for baseline levels of math grades but not for their development. No interaction effect was found for German grades. These findings are discussed against the background that (synergistic) interaction effects between intelligence and conscientiousness might be more relevant in older students from higher secondary school or university context.
description: Journal of Intelligence.;Vol. 11. 2023, Issue 3, Artikel-ID 45
SIENNA D3.7: Proposal for an ethical framework for human enhancement
Creators: name: Kühler, Michael
name: Nils-Frederic Wagner
name: Brey, Philip
Publisher: name: Zenodo
Year: 2020
Subjects: human enhancement
ethical framework
research ethics
medical ethics

description: This report provides proposals towards, and discussions of, a general ethical framework for research on and development of human enhancement technologies (HET). Until now, in spite of the extensive discussions on human enhancement and its ethical aspects, both in academic as well as in popular circles, very few, if any, proposals for ethical guidelines to guide research, development and human enhancement technologies have been made In this deliverable we will consider both the pros and cons of the development of ethical guidelines at this time. We will start by distinguishing between general ethical guidelines and guidelines for specific types of enhancement. We will then present three options for developing ethical guidelines for human enhancement, if the choice is made to do so: self- contained general ethical guidelines, self-contained domain- or field-specific ethical guidelines, and general or field-specific guidelines incorporated into existing guidelines for medical, computer and engineering ethics. We will then discuss more specifically how research ethics committees (RECs) in the medical, computer and engineering sciences could implement guidelines for human enhancement into their existing protocols. Finally, in our annexes, we include two documents: firstly a reference document that RECs could use to inform researchers about ethical issues in human enhancement and how these could be addressed in their self-assessment, and secondly case studies that could further help in understanding what types of issues can arise in connection to HET.
Using Pre-/Post-Quizzes Intentionally in Curriculum Development and Evaluation
Creators: name: Cooksey, Kathy L.
name: Jonsson, Patrik
Publisher: name: arXiv
Year: 2022
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: Developing the final summative assessment of a course at the start of curriculum development is an implementation of "backward design," whereby learning objectives are identified first and the curriculum is engineered end-to-beginning to achieve them. We trained in backward design through the Professional Development Program (PDP) and adapted PDP assessment ideas for evaluation of curriculum designs and teaching efficacy. A pre-/post-quiz is an assessment administered the first and last day of a course; a learner's scores are used to measure normalized gain: the ratio of what a student learned during a course relative to what they knew entering it. The intentional process of developing a pre-/post-quiz for every course focuses the educator on the essential understanding desired of the learners exiting the course. The normalized-gain statistics for the course can then be used to evaluate the course's efficacy, and improvements to the curriculum can be monitored by tracking the normalized gains over time, using the same pre-/post-quiz. Moreover, an individual instructor may self-evaluate their teaching efficacy by tracking normalized gains from all courses over time. Here we discuss applying the practice of backward curriculum design starting with a custom pre-/post-quiz and utilizing it for immediate and longitudinal evaluation, focusing primarily on designing an entire undergraduate science course.
description: 17 pages, 2 figures; in S. Seagroves, A. Barnes, A.J. Metevier, J. Porter, & L. Hunter (Eds.), Leaders in effective and inclusive STEM: Twenty years of the Institute for Scientist & Engineer Educators. UC Santa Cruz: Institute for Scientist & Engineer Educators; see https://escholarship.org/uc/isee_pdp20yr
Ανάλυση πιστωτικού κινδύνου μέσω μεθόδου μηχανικής μάθησης
Creators: name: Μπαμπούρη, Ευφροσύνη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Εξόρυξη γνώσης
subject: Μηχανική μάθηση
subject: Πιστωτικός κίνδυνος
subject: Πρόβλεψη
subject: Πιθανότητα αθέτησης
subject: Αξιολόγηση πιστωτικού κινδύνου
subject: Δέντρα απόφασης

description: Η ταχεία εξέλιξη της τεχνολογίας, το ανταγωνιστικό περιβάλλον και ο τεράστιος όγκος δεδομένων που είναι διαθέσιμα στην σημερινή εποχή, λαμβάνουν υπόψη την επείγουσα ανάγκη των εταιρειών να μεταβούν σε μια νέα ψηφιακή πραγματικότητα. Η χρήση δεδομένων για την αυτοματοποίηση των διαδικασιών και των αποφάσεων μέσω της χρήσης νέων μεθόδων όπως η τεχνητή νοημοσύνη και η μηχανική μάθηση είναι κύριος στόχος των οργανισμών. Στα πρώτα βήματα της, η τεχνητή νοημοσύνη, αν και προκάλεσε ενθουσιασμό και ενδιαφέρον, δεν μπόρεσε να εφαρμοστεί με την αναμενόμενη επιτυχία. Πρόσφατες τεχνολογικές εξελίξεις και ανακαλύψεις κατέστησαν τις εφαρμογές της Τεχνητής Νοημοσύνης εμπορικά βιώσιμες. Η Τεχνητή Νοημοσύνη καθίσταται μια από τις πιο δημοφιλείς τεχνολογίες η οποία πρόκειται να μετασχηματίσει τον τραπεζικό κλάδο, καθώς οι εφαρμογές της αποδεικνύονται βιώσιμες και η αποδοχή τους από τους πελάτες ικανοποιητική. Στον τραπεζικό κλάδο η Τεχνητή Νοημοσύνη εφαρμόζεται, μεταξύ άλλων, στην εξυπηρέτηση πελατών, στην ανίχνευση απάτης και ξεπλύματος μαύρου χρήματος, στην εφαρμογή κανονιστικής συμμόρφωσης, στην ανάλυση και την αξιολόγηση του πιστωτικού κινδύνου. Στην παρούσα διπλωματική εργασία αναπτύχθηκαν τρία μοντέλα εποπτευόμενης μηχανικής μάθησης, με τα οποία γίνεται η ταξινόμηση των πελατών μίας τράπεζας σε «καλούς» ή «κακούς» με βάση την πιθανότητα αθέτησης των υποχρεώσεών τους. Οι αλγόριθμοι που χρησιμοποιήθηκαν είναι οι Random Forest, KNN και Decision Trees.
A jetlet hierarchy for ideal fluid dynamics
Creators: name: Cotter, C. J.
name: Holm, D. D.
name: Jacobs, H. O.
name: Meier, D. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Mathematical Physics (math-ph)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Truncated Taylor expansions of smooth flow maps are used in Hamilton's principle to derive a multiscale Lagrangian particle representation of ideal fluid dynamics. Numerical simulations for scattering of solutions at one level of truncation are found to produce solutions at higher levels. These scattering events to higher levels in the Taylor expansion are interpreted as modeling a cascade to smaller scales.
description: 1st revision -- Comments welcome
Propagation of Superluminal PeV IceCube Neutrinos: A High Energy Spectral Cutoff or New Constraints on Lorentz Invariance Violation
Creators: name: Stecker, Floyd W.
name: Scully, Sean T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The IceCube observation of cosmic neutrinos with $E_ν > 60$ TeV, most of which are likely of extragalactic origin, allows one to severely constrain Lorentz invariance violation (LIV) in the neutrino sector, allowing for the possible existence of superluminal neutrinos. The subsequent neutrino energy loss by vacuum $e^+e^-$ pair emission (VPE) is strongly dependent on the strength of LIV. In this paper we explore the physics and cosmology of superluminal neutrino propagation. We consider a conservative scenario for the redshift distribution of neutrino sources. Then by propagating a generic neutrino spectrum, using Monte Carlo techniques to take account of energy losses from both VPE and redshifting, we obtain the best present constraints on LIV parameters involving neutrinos. We find that $δ_{νe} = δ_ν - δ_e \le 5.2 \times 10^{-21}$. Taking $δ_e \le 5 \times 10^{-21}$, we then obtain an upper limit on the superluminal velocity fraction for neutrinos alone of $1.0 \times 10^{-20}$. Interestingly, by taking $δ_{νe} = 5.2 \times 10^{-21}$, we obtain a cutoff in the predicted neutrino spectrum above 2 PeV that is consistent with the lack of observed neutrinos at those energies, and particularly at the Glashow resonance energy of 6.3 PeV. Thus, such a cutoff could be the result of neutrinos being slightly superluminal, with $δ_ν$ being $(0.5 \ {\rm to} \ 1.0) \times 10^{-20}$.
description: 4 pages, 3 eps figures, corrected Fig. 3, added discussion and added/updated references. conclusions unchanged
Detecting Anomalies within Smart Buildings using Do-It-Yourself Internet of Things
Creators: name: Majib, Yasar
name: Barhamgi, Mahmoud
name: Heravi, Behzad Momahed
name: Kariyawasam, Sharadha
name: Perera, Charith
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Detecting anomalies at the time of happening is vital in environments like buildings and homes to identify potential cyber-attacks. This paper discussed the various mechanisms to detect anomalies as soon as they occur. We shed light on crucial considerations when building machine learning models. We constructed and gathered data from multiple self-build (DIY) IoT devices with different in-situ sensors and found effective ways to find the point, contextual and combine anomalies. We also discussed several challenges and potential solutions when dealing with sensing devices that produce data at different sampling rates and how we need to pre-process them in machine learning models. This paper also looks at the pros and cons of extracting sub-datasets based on environmental conditions.
description: Journal of Ambient Intelligence and Humanized Computing (2022)
Spontaneous Compactification of Bimetric Theory
Creators: name: Kan, Nahomi
name: Maki, Takuya
name: Shiraishi, Kiyoshi
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We propose a model of bimetric gravity in which the mixing of metrics naturally gives a mass to a graviton by the compactification with flux of two gauge fields in extra dimensions. We assume that each metric in the solution for the background geometry describes the four-dimensional Minkowski spacetime with an $S^2$ extra space, though the two radii of $S^2$ for two metrics take different values in general. The solution is derived by the effective potential method in the presence of the magnetic fluxes on the extra spheres. We find that the a massive graviton is governed by the Fierz-Pauli Lagrangian in the weak field limit and one massless graviton left in four dimensions.
description: 10 pages, no figure, minor correction and references added
title: Ναυτιλία και συμβολή στην παγκόσμια και ελληνική οικονομία : νομοθετικό πλαίσιο, Κίνδυνοι και κόστος
title: Shipping and its contribution to the global and Greek economy : legal framework, risks, and costs
titleType: AlternativeTitle
Creators: name: Πετρίδη, Ευτυχία Κόμισσα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Θαλάσσια μεταφορά
subject: Εμπόρευμα
subject: Φορτίο
subject: Νομοθετικό πλαίσιο
subject: Κίνδυνος
subject: Προστασία
subject: Ναυτιλία
subject: Κόστος

description: Στην παρούσα μελέτη με τίτλο «Ναυτιλία και συμβολή στην παγκόσμια και ελληνική οικονομία: Νομοθετικό πλαίσιο, Κίνδυνοι και Κόστος», εξετάζεται ο ρόλος της Ναυτιλίας στην παγκόσμια και ελληνική οικονομία, το νομοθετικό πλαίσιο που διέπει τις Θαλάσσιες Μεταφορές, τους κινδύνους και το κόστος από απειλές, όπως τρομοκρατικό χτύπημα, πειρατεία κ.α. Αρχικά, στο πρώτο κεφαλαίο δίνεται ο ορισμός της Ναυτιλίας και έπειτα γίνεται μια ιστορική αναδρομή από τη δημιουργία του κλάδου της Ναυτιλίας και πώς ο κλάδος εξελίχθηκε στο πέρας του χρόνου. Εν συνεχεία, γίνεται βιβλιογραφική διερεύνηση για την ανάδειξη των επιδράσεων του κλάδου στην παγκόσμια και ελληνική οικονομία και αναλύονται οι τύποι φορτίου και ναύλωσης. Στη συνέχεια, περιγράφεται η σημαντική συμβολή του Διεθνούς Ναυτιλιακού Οργανισμού στον κλάδο της Ναυτιλίας (International Maritime Organization / ΙΜΟ). Στο δεύτερο κεφάλαιο περιγράφεται η θαλάσσια μεταφορά των εμπορευμάτων, αναλύοντας την συνδυασμένη μεταφορά (intermodal transport) και τα συμβαλλόμενα μέρη της ναύλωσης, αναλύοντας τον ρόλο των συμβαλλόμενων μερών στην μεταφορά φορτίου χύδην και συγκεκριμένα στην μεταφορά του πετρελαίου. Στο τρίτο κεφάλαιο, μέσω βιβλιογραφικής μελέτης και έρευνας αναλύεται το νομοθετικό πλαίσιο το οποίο διέπει τις Θαλάσσιες Μεταφορές, τους κινδύνους και τα μέτρα προστασίας που μπορούν να εφαρμοστούν για την προστασία τόσο των εμπορευμάτων όσο και των εμπλεκομένων, καθώς και, αναλύεται το κόστος από τους υφιστάμενους κινδύνους. Εν συνεχεία, στο τέταρτο κεφάλαιο, παρατίθεται ένα Case Study για να γίνει πιο κατανοητή η διαδικασία προστασίας ενός πλοίου (του εμπορεύματος και του πληρώματός του), στην συγκεκριμένη περίπτωση του AZBURG στην Μαύρη Θάλασσα και ακολούθως, στο πέμπτο κεφάλαιο διατυπώνονται προτάσεις πρόληψης και μειώσεις των κινδύνων στις Θαλάσσιες Μεταφορές. Τέλος, εξάγονται χρήσιμα και σημαντικά συμπεράσματα σχετικά με το θέμα της παρούσας έρευνας.
title: Η επιρροή της σχέσης εργαζομένου-διοίκησης στις επιδόσεις των εκπαιδευτικών στην ιδιωτική εκπαίδευση
title: The Influence of employee-management relationship into performance of teachers in private schools
titleType: AlternativeTitle
Creators: name: Ραδιώτη, Νίκη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Απόδοση
subject: Επίδοση
subject: Ανθρώπινο δυναμικό
subject: Εκπαιδευτικοί
subject: Ιδιωτική εκπαίδευση
subject: Διοίκηση

description: Η διαχείριση του ανθρώπινου δυναμικού μπορεί να παίξει σημαντικό ρόλο στην απόδοση των εκπαιδευτικών. Οι αποτελεσματικές πρακτικές διαχείρισης ανθρώπινου δυναμικού μπορούν να βοηθήσουν στην προσέλκυση, διατήρηση και ανάπτυξη εκπαιδευτικών υψηλής ποιότητας, οι οποίοι με τη σειρά τους μπορούν να συμβάλουν σε βελτιωμένα αποτελέσματα διδασκαλίας και μάθησης. Η σχέση μεταξύ της διαχείρισης ανθρώπινων πόρων και της απόδοσης των εκπαιδευτικών ισχύει και στην ιδιωτική εκπαίδευση. Στην πραγματικότητα, οι αποτελεσματικές πρακτικές διαχείρισης ανθρώπινου δυναμικού μπορεί να είναι ακόμη πιο σημαντικές στα ιδιωτικά σχολεία, όπου ο ανταγωνισμός για εκπαιδευτικούς υψηλής ποιότητας μπορεί να είναι έντονος και οι διαθέσιμοι οικονομικοί πόροι για αποζημιώσεις και παροχές μπορεί να είναι πιο περιορισμένοι σε σύγκριση με τα δημόσια σχολεία. Ορισμένες από τις πρακτικές διαχείρισης ανθρώπινου δυναμικού που μπορούν να επηρεάσουν την απόδοση των εκπαιδευτικών, όπως οι διαδικασίες πρόσληψης, οι ευκαιρίες για επαγγελματική ανάπτυξη, η αξιολόγηση της απόδοσης και ανατροφοδότηση, καθώς και το σύστημα ανταμοιβών, μελετήθηκαν στην παρούσα εργασία σε ένα δείγμα ευκολίας 104 εργαζομένων της ιδιωτικής εκπαίδευσης. Η ανάλυση πραγματοποιήθηκε με τη χρήση SPSS. Συνολικά, οι αποτελεσματικές πρακτικές διαχείρισης ανθρώπινου δυναμικού μπορούν να βοηθήσουν στη δημιουργία ενός υποστηρικτικού εργασιακού περιβάλλοντος για τους εκπαιδευτικούς, αυξάνοντας την ικανοποίησή τους, και να συμβάλουν στη βελτίωση των αποτελεσμάτων διδασκαλίας και μάθησης. Επενδύοντας στους δασκάλους τους, τα σχολεία μπορούν να βοηθήσουν να διασφαλίσουν ότι οι μαθητές τους λαμβάνουν εκπαίδευση υψηλής ποιότητας.
Double plumbings of disk bundles over spheres
Creators: name: Horvat, Eva
Publisher: name: arXiv
Year: 2014
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M27, 57R95

description: We consider double plumbings of two disk bundles over spheres. We calculate the Heegaard-Floer homology with its absolute grading of the boundary of such a plumbing. Given a closed smooth 4-manifold $X$ and a suitable pair of classes in $H_{2}(X)$, we investigate when this pair of classes may be represented by a configuration of surfaces in $X$ whose regular neighbourhood is a double plumbing of disk bundles over spheres. Using similar methods we study single plumbings of two disk bundles over spheres inside $X$.
description: 40 pages, 9 figures
Insights into the behavior of certain optical systems gleaned from Feynman's approach to quantum electrodynamics
Creators: name: Mansuripur, Masud
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Richard Feynman's method of path integrals is based on the fundamental assumption that a system starting at a point A and arriving at a point B takes all possible paths from A to B, with each path contributing its own (complex) probability amplitude. The sum of the amplitudes over all these paths then yields the overall probability amplitude that the system starting at A would end up at B. We apply Feynman's method to several optical systems of practical interest and discuss the nuances of the method as well as instances where the predicted outcomes agree or disagree with those of classical optical theory. Examples include the properties of beam-splitters, passage of single photons through Mach-Zehnder and Sagnac interferometers, electric and magnetic dipole scattering, reciprocity, time-reversal symmetry, the optical theorem, the Ewald-Oseen extinction theorem, far field diffraction, and the two-photon interference phenomenon known as the Hong-Ou-Mandel effect.
description: 42 pages, 18 figures, 3 appendices, 30 references
title: Strategies employed in an alternative school setting for adolescents with special needs, to achieve academic and behavioural growth
Creators: name: Arathoon, Nicole
Publisher: name: University of Southern Queensland
Year: 2023
Subjects: classificationCode: 3904
subject: Specialist studies in education

description: This paper reports a case study focussed on a co-educational alternative secondary school in an Inner West suburb of Sydney, NSW, which caters to adolescents in Years 7 – 10 who are diagnosed with one or more of the following special needs: attention deficit hyperactivity disorder, oppositional defiance disorder, autism spectrum disorder, learning difficulties and mental health complexities. The researcher identified, across the literature, twelve good practice strategies which should be included in alternative school settings in order to achieve a level of behavioural and academic success for adolescents. Four staff members employed in this alternative school setting were interviewed individually and were required to rank the twelve good practice strategies in order of effectiveness, based on their professional knowledge and experience in this school. Three themes emerged from the interviews, which highlighted the effectiveness of building relationships, positive approaches, and flexibility as the strategies that achieve academic and behavioural success for students in alternative school settings.
title: Παράγοντες που επηρεάζουν την στρατηγική τιμολόγησης : μια εμπειρική μελέτη
title: Factors affecting the pricing strategy : an empirical approach
titleType: AlternativeTitle
Creators: name: Γιαννόπουλος, Παναγιώτης
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Στρατηγικές τιμολόγησης
subject: Παράγοντες επιρροής στρατηγικών τιμολόγησης
subject: Ανταγωνιστικές στρατηγικές
subject: Εταιρικές στρατηγικές
subject: Β2Β αγορές

description: Η λήψη αποφάσεων σχετικά με την τιμολόγηση των αγαθών ενός οργανισμού, έχει αποτελέσει ένα από τα κύρια ζητήματα που απασχολούν την επιστημονική και επιχειρηματική κοινότητα, καθώς τέτοιου είδους αποφάσεις έχουν άμεση επίπτωση στην κερδοφορία και τα ταμειακά διαθέσιμα των οργανισμών. Υπό την έννοια αυτή, οι αποφάσεις τιμολόγησης έχουν έντονο στρατηγικό χαρακτήρα και επηρεάζουν τόσο τον σχεδιασμό ανταγωνιστικών στρατηγικών, σε ένα πρώτο επίπεδο, όσο και τον γενικότερο στρατηγικό σχεδιασμό, σε μακροπρόθεσμο ορίζοντα. Στο πλαίσιο της παρούσας διπλωματικής εργασίας, αναδεικνύεται η συσχέτιση των στρατηγικών τιμολόγησης με τις ανταγωνιστικές και τις εταιρικές στρατηγικές. Επιπρόσθετα, παρατίθενται ορισμένες κλασικές στρατηγικές τιμολόγησης, ενώ δίνεται και το θεωρητικό υπόβαθρο σχεδιασμού στρατηγικών τιμολόγησης, μέσω της ανάλυσης των ποιοτικών και ποσοτικών στόχων που θέτουν οι οργανισμοί κατά την στρατηγική επιλογή εμπορίας ή παραγωγής συγκεκριμένων αγαθών. Ένας ορθολογικός σχεδιασμός, αναμφίβολα επηρεάζεται από εσωτερικούς, εξωτερικούς και παράγοντες σχετικά με τον κύκλο ζωής των αγαθών. Σχετικά, με την παραμετροποίηση των εν λόγω περιορισμών, γίνεται αναλυτική αναφορά. Στον πυρήνα της εργασίας, βρίσκεται η ανάπτυξη ενός ολοκληρωμένου πλάνου τιμολόγησης, με χρήση τεχνικών ανάλυσης δεδομένων. Το πλάνο, υλοποιείται με ανάλυση δεδομένων οργανισμού, που δραστηριοποιείται σε χονδρικό εμπόριο (B2B). Η συγκριτική θεώρηση του προτεινόμενου πλάνου, με τα αντίστοιχα μαθηματικά μοντέλα προσομοίωσης των κλασικών στρατηγικών τιμολόγησης, αποδεικνύει την υπεροχή του έναντι των υπολοίπων. Συγκεκριμένα, αποδεικνύεται δυνητική αύξηση της κερδοφορίας της τάξης του 20%, σε βάθος διετίας.
Photoluminescence spectroscopy of YVO$_{4}$:Eu$^{3+}$ nanoparticles with aromatic linker molecules: a precursor to biomedical functionalization
Creators: name: Senty, T. R.
name: Yalamanchi, M.
name: Zhang, Y.
name: Cushing, S. K.
name: Seehra, M. S.
name: Shi, X.
name: Bristow, A. D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Photoluminescence spectra of YVO$_{4}$:Eu$^{3+}$ nanoparticles are presented,with and without the attachment of of organic linker molecules that are proposed for linking to biomolecules. YVO$_{4}$:Eu$^{3+}$ nanoparticles with 5% dopant concentration were synthesized by wet chemical synthesis. X-ray diffraction and transmission electron microscopy show the expected wakefieldite structure of tetragonal particles with an average size of 17 nm. Fourier-transform infrared spectroscopy determines that metal-carboxylate coordination is successful in replacing the native metal-hydroxyl bonds with three organic linkers, namely benzoic acid, 3-nitro 4-chloro-benzoic acid and 3,4-dihydroxybenzoic acid, in separate treatments. UV-excitation photoluminescence spectra show that the position and intensity of dominant $^{5}D_{0}-^{7}F_{2}$ electric-dipole transition at 619 nm is unaffected by the benzoic acid and 3-nitro 4-chloro-benzoic acid treatments. Attachment of the 3,4-dihydroxybenzoic acid produces an order-of-magnitude quenching of the photoluminescence, due to the presence of high-frequency modes in the linker. Ratios of the dominant electric- and magnetic-dipole transitions confirm infrared measurements, which indicate that the bulk crystal of the nanoparticle is unchanged by all three treatments.
description: 9 pages, 5 figures, journal article
title: Molecular genetic analyses in hereditary cardiac arrhythmia syndromes
Creators: name: Scheiper-Welling, Stefanie
Publisher: name: UNSPECIFIED
Year: 2022

description: The present thesis describes the value and application of NGS in genetic investigations of sudden unexpected death cases and inherited arrhythmia syndromes using targeted sequencing. It represents the conceptualization, establishment and optimization of an NGS workflow for challenging heterogeneous - forensic and diagnostic - sample material. Furthermore, this work illustrates the need of characterization experiments of variants with unknown functional relevance.
The State Machine Based Automatic Conditioning Application for PITZ
Creators: name: Melkumyan, David
name: Boonpornprasert, P.
name: Chen, Y.
name: Good, J. D.
name: Groß, M.
name: Huck, H.
name: Isaev, Igor
name: Kalantaryan, Davit
name: Krasilnikov, M.
name: Lishilin, O.
name: Loisch, G.
name: Oppelt, A.
name: Petrosyan, B.
name: Qian, Houjun
name: Stephan, F.
name: Trowitzsch, G.
name: Otevrel, Marek
name: Renier, Yves
name: Vashchenko, Gryforii
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2018

description: 12th International Workshop on Personal Computers and Particle Accelerator Controls, Hsinchu, Taiwan, 16 Oct 2018 - 19 Oct 2018
Διαχείριση στρατηγικού κινδύνου στο φαρμακευτικό επιχειρείν
Creators: name: Καφίρη, Λουκία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Κίνδυνος
subject: Στρατηγική
subject: Διαχείριση κινδύνου

description: Το διαρκώς μεταβαλλόμενο επιχειρηματικό τοπίο αναγκάζει τις εταιρείες να αντιμετωπίζουν αβεβαιότητα κάθε μέρα: οι νέες τεχνολογίες, ο ανταγωνισμός, η παγκοσμιοποίηση και η καινοτομία σε προϊόντα και διαδικασίες επηρεάζουν καθοριστικά τη δυναμική διαδικασία της λήψης αποφάσεων. Ο τρόπος με τον οποίο οι οργανισμοί αντιμετωπίζουν την αβεβαιότητα και τους διάφορους κινδύνους μπορεί να αποτελέσει βασικό παράγοντα επιτυχίας ή αποτυχίας. Στον τομέα της Υγείας, οι κίνδυνοι απορρέουν από στρατηγικά λάθη, από λειτουργικές ή χρηματοοικονομικές αστοχίες, από αστοχίες των συστημάτων ποιότητας και ασφάλειας, από μείζονα περιβαλλοντικά συμβάντα ή γεγονότα δημόσιας υγείας, από ανεπαρκείς εγκαταστάσεις ή αναποτελεσματικό εξοπλισμό και από ελλιπή συμμόρφωση στους κανονισμούς (NSW Health,2015). Η διαχείριση κινδύνων αποτελεί ένα κορυφαίο ζήτημα και για τις επιχειρηματικές οντότητες του φαρμακευτικού κλάδου. Σε ένα πολιτικά και οικονομικά ταραχώδες περιβάλλον, οι κίνδυνοι που αντιμετωπίζουν οι φαρμακευτικές εταιρείες, ιδίως στον σχεδιασμό και στην εκτέλεση κλινικών δοκιμών, στην έγκριση φαρμάκων, στην ποιότητα των προϊόντων και στις παγκόσμιες εμπορικές πρακτικές, αυξάνονται τόσο σε συχνότητα όσο και σε μέγεθος. Εκτός από τους σημαντικούς ρυθμιστικούς κινδύνους, οι φαρμακευτικές εταιρείες αντιμετωπίζουν επιπλέον στρατηγικούς κινδύνους που σχετίζονται με τον επιχειρηματικό σχεδιασμό και τη λήψη αποφάσεων στο ανώτερο επίπεδο διοίκησης. Στην παρούσα διατριβή επιδιώκεται η ανάλυση θεωρητικών εννοιών του κινδύνου και της διαχείρισης του στο σύγχρονο επιχειρηματικό περιβάλλον. Κατόπιν παράθεσης θεμελιωδών εννοιών, η μελέτη εστιάζει στη φύση του στρατηγικού κινδύνου και στην πρακτική διαχείριση αυτού στο φαρμακευτικό κλάδο. Η μελέτη περίπτωσης του Ομίλου Lavipharm A.E. επικυρώνει το σκοπό της εργασίας, βασιζόμενη στο στρατηγικό έλεγχο της εταιρείας, στην τοποθέτηση του εσωτερικού περιβάλλοντος της στις τρέχουσες εξωτερικές συνθήκες και στην εξέταση της ιστορικής πορείας της μέσα από πρότερες και μελλοντικές στρατηγικές. Στη διάρκεια ελέγχου πληρότητας βασικών κριτηρίων διαχείρισης στρατηγικού κινδύνου από τον Όμιλο μέσω ερωτηματολογίου, ενσωματώνεται η πρακτική εφαρμογή των κυριότερων σημείων και συμπερασμάτων του θεωρητικού μέρους της μελέτης, σε έναν ολοκληρωμένο οργανισμό Έρευνας και Ανάπτυξης, παραγωγής, εισαγωγής, εμπορίας και διανομής προϊόντων υγείας στην Ελλάδα και στο διεθνές στερέωμα.
The Two-Loop Master Integrals for $q \bar{q} \to V V$
Creators: name: Gehrmann, Thomas
name: von Manteuffel, Andreas
name: Tancredi, Lorenzo
name: Weihs, Erich
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the full set of two-loop Feynman integrals appearing in massless two-loop four-point functions with two off-shell legs with the same invariant mass. These integrals allow to determine the two-loop corrections to the amplitudes for vector boson pair production at hadron colliders, $q \bar{q} \to V V$, and thus to compute this process to next-to-next-to-leading order accuracy in QCD. The master integrals are derived using the method of differential equations, employing a canonical basis for the integrals. We obtain analytical results for all integrals, expressed in terms of multiple polylogarithms. We optimize our results for numerical evaluation by employing functions which are real valued for physical scattering kinematics and allow for an immediate power series expansion.
description: 26 pages, results included as ancillary files. v2: minor typos corrected, references added, published on JHEP
title: Συγκριτική ανάλυση μεταξύ FDA και EMA
title: Comparative analysis between FDA and EMA
titleType: AlternativeTitle
Creators: name: Μπαρτζώκα, Αντιγόνη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2022
Subjects: subject: EMA
subject: FDA

description: Ο Ευρωπαϊκός Οργανισμός Φαρμάκων (ΕΜΑ) και ο FDA έχουν κοινούς στόχους, μεταξύ των οποίων η προστασία της δημόσιας υγείας, η αξιολόγηση της ασφάλειας και της αποτελεσματικότητας των θεραπευτικών προϊόντων, η συνεργασία με εξωτερικούς εμπειρογνώμονες, η παροχή πληροφοριών σχετικά με τη νομοθεσία και την υγεία και η ενίσχυση της ανάπτυξης προϊόντων. Ωστόσο, οι εν λόγω οργανισμοί διαφέρουν ως προς τη διάρθρωση, στους χρόνους εξέτασης των φαρμάκων και την αξιολόγηση οφέλους-κινδύνου. Συμπερασματικά, είναι σημαντικό να διαμορφωθεί μια δικλείδα ασφαλείας για τους αποδέκτες του δικαιώματος στην υγεία, που είναι πολίτες (Adashi et al., 2022). Η διαχείριση των προβλημάτων υγείας πρέπει να πραγματοποιείται με τον ίδιο τρόπο σε όλα τα κράτη. Ουσιαστικά, τα κράτη μέλη πρέπει να επικοινωνούν μεταξύ τους για να αναπτύξουν τα σχέδια δράσης τους για την επίτευξη του υψηλότερου επιπέδου υγειονομικής περίθαλψης (Adashi et al., 2022). Έτσι, οι πολίτες θα έχουν εμπιστοσύνη στη δύναμη της έννομης τάξης και στα φαρμακευτικά υλικά που παράγει.
Linear and angular momenta of photons in the context of "which path" experiments of quantum mechanics
Creators: name: Mansuripur, Masud
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In optical experiments involving a single photon that takes alternative paths through an optical system and ultimately interferes with itself (e.g., Young's double-slit experiment, Mach-Zehnder interferometer, Sagnac interferometer), there exist fundamental connections between the linear and angular momenta of the photon on the one hand, and the ability of an observer to determine the photon's path through the system on the other hand. This paper examines the arguments that relate the photon momenta (through the Heisenberg uncertainty principle) to the "which path" (German: welcher Weg) question at the heart of quantum mechanics. We show that the linear momenta imparted to apertures or mirrors, or the angular momenta picked up by strategically placed wave-plates in a system, could lead to an identification of the photon's path only at the expense of destroying the corresponding interference effects. We also describe a thought experiment involving the scattering of a circularly-polarized photon from a pair of small particles kept at a fixed distance from one another. The exchange of angular momentum between the photon and the scattering particle in this instance appears to provide the "which path" information that must, of necessity, wipe out the corresponding interference fringes, although the fringe-wipe-out mechanism does not seem to involve the uncertainty principle in any obvious way.
description: 12 pages, 5 figures, 12 equations, 19 references, one appendix
Post-Newtonian Conservation Laws in Rigid Quasilocal Frames
Creators: name: McGrath, Paul L.
name: Chanona, Melanie
name: Epp, Richard J.
name: Koop, Michael J.
name: Mann, Robert B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In recent work we constructed completely general conservation laws for energy and linear and angular momentum of extended systems in general relativity based on the notion of a rigid quasilocal frame (RQF). We argued at a fundamental level that these RQF conservation laws are superior to conservation laws based on the local stress-energy-momentum tensor of matter because (1) they do not rely on spacetime symmetries and (2) they properly account for both matter and gravitational effects. Moreover, they provide simple, exact, operational expressions for fluxes of gravitational energy and linear and angular momentum. In this paper we derive the form of these laws in a general first post-Newtonian (1PN) approximation, and then apply these approximate laws to the problem of gravitational tidal interactions. We obtain formulas for tidal heating and tidal torque that agree with the literature, but without resorting to the use of pseudotensors. We describe the physical mechanism of these tidal interactions not in the traditional terms of a Newtonian gravitational force, but in terms of a much simpler and universal mechanism that is an exact, quasilocal manifestation of the equivalence principle in general relativity. As concrete examples, we look at the tidal heating of Jupiter's moon Io and angular momentum transfer in the Earth-Moon system that causes a gradual spin-down of the Earth and recession of the Moon. In both examples we find agreement with observation.
description: 22 pages, 2 figures
A comparative analysis of the statistical properties of large mobile phone calling networks
Creators: name: Li, Ming-Xia
name: Jiang, Zhi-Qiang
name: Xie, Wen-Jie
name: Miccichè, Salvatore
name: Tumminello, Michele
name: Zhou, Wei-Xing
name: Mantegna, Rosario N.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Mobile phone calling is one of the most widely used communication methods in modern society. The records of calls among mobile phone users provide us a valuable proxy for the understanding of human communication patterns embedded in social networks. Mobile phone users call each other forming a directed calling network. If only reciprocal calls are considered, we obtain an undirected mutual calling network. The preferential communication behavior between two connected users can be statistically tested and it results in two Bonferroni networks with statistically validated edges. We perform a comparative analysis of the statistical properties of these four networks, which are constructed from the calling records of more than nine million individuals in Shanghai over a period of 110 days. We find that these networks share many common structural properties and also exhibit idiosyncratic features when compared with previously studied large mobile calling networks. The empirical findings provide us an intriguing picture of a representative large social network that might shed new lights on the modelling of large social networks.
Increasing Data Equity Through Accessibility
Creators: name: Elavsky, Frank
name: Mankoff, Jennifer
name: Satyanarayan, Arvind
Publisher: name: arXiv
Year: 2022
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: This position statement is a response to the Office of Science and Technology Policy's Request for Information on "Equitable Data Engagement and Accountability." This response considers data equity specifically for people with disabilities. The RFI asks "how Federal agencies can better support collaboration with other levels of government, civil society, and the research community around the production and use of equitable data." We argue that one critically underserved community in the context of data equity is people with disabilities. Today's tools make it extremely difficult for disabled people to (1) interact with data and data visualizations and (2) take jobs that involve working with and visualizing data. Yet access to such data is increasingly critical, and integral, to engaging with government and civil society. We must change the standards and expectations around data practices to include disabled people and support the research necessary to achieve those goals.
description: 6 pages
Tree Mover's Distance: Bridging Graph Metrics and Stability of Graph Neural Networks
Creators: name: Chuang, Ching-Yao
name: Jegelka, Stefanie
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Understanding generalization and robustness of machine learning models fundamentally relies on assuming an appropriate metric on the data space. Identifying such a metric is particularly challenging for non-Euclidean data such as graphs. Here, we propose a pseudometric for attributed graphs, the Tree Mover's Distance (TMD), and study its relation to generalization. Via a hierarchical optimal transport problem, TMD reflects the local distribution of node attributes as well as the distribution of local computation trees, which are known to be decisive for the learning behavior of graph neural networks (GNNs). First, we show that TMD captures properties relevant to graph classification: a simple TMD-SVM performs competitively with standard GNNs. Second, we relate TMD to generalization of GNNs under distribution shifts, and show that it correlates well with performance drop under such shifts.
Quantifying the nonlinearity of a quantum oscillator
Creators: name: Paris, Matteo G. A.
name: Genoni, Marco G.
name: Shammah, Nathan
name: Teklu, Berihu
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We address the quantification of nonlinearity for quantum oscillators and introduce two measures based on the properties of the ground state rather than on the form of the potential itself. The first measure is a fidelity-based one, and corresponds to the renormalized Bures distance between the ground state of the considered oscillator and the ground state of a reference harmonic oscillator. Then, in order to avoid the introduction of this auxiliary oscillator, we introduce a different measure based on the non-Gaussianity (nG) of the ground state. The two measures are evaluated for a sample of significant nonlinear potentials and their properties are discussed in some detail. We show that the two measures are monotone functions of each other in most cases, and this suggests that the nG-based measure is a suitable choice to capture the anharmonic nature of a quantum oscillator, and to quantify its nonlinearity independently on the specific features of the potential. We also provide examples of potentials where the Bures measure cannot be defined, due to the lack of a proper reference harmonic potential, while the nG-based measure properly quantify their nonlinear features. Our results may have implications in experimental applications where access to the effective potential is limited, e.g., in quantum control, and protocols rely on information about the ground or thermal state.
description: 8 pages, 5 figures, published version
Time resolution below 100 ps for the SciTil detector of PANDA employing SiPM
Creators: name: Brunner, S. E.
name: Gruber, L.
name: Marton, J.
name: Orth, H.
name: Suzuki, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The barrel time-of-flight (TOF) detector for the PANDA experiment at FAIR in Darmstadt is planned as a scintillator tile hodoscope (SciTil) using 8000 small scintillator tiles. It will provide fast event timing for a software trigger in the otherwise trigger-less data acquisition scheme of PANDA, relative timing in a multiple track event topology as well as additional particle identification in the low momentum region. The goal is to achieve a time resolution of sigma ~ 100 ps. We have conducted measurements using organic scintillators coupled to Silicon Photomultipliers (SiPM). The results are encouraging such that we are confident to reach the required time resolution.
description: 10 pages, 7 figures
Universal parametrization of jet production based on parton and fragment rapidities
Creators: name: Trainor, Thomas A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: As the signature manifestation of QCD in high energy nuclear collisions jet production provides essential tests of that theory. But event-wise jet reconstruction can be complex and susceptible to measurement bias. And QCD theory in the form of Monte Carlo models of elementary collisions can also be complex and difficult to test. It may be beneficial to construct a simple static model of jet production in p-p collisions to facilitate data comparisons and model tests. QCD is a logarithmic theory featuring variations with energy scale of the form $\log(s/s_0)$. Jet-related data such as parton fragmentation functions plotted on logarithmic rapidities exhibit self-similar scaling behavior which admits simple and accurate parametrization with only a few parameters. In this study we extend that method to construct a parametrization of jet (scattered parton) momentum spectra based on certain measured logarithmic jet production trends. The parametrization is established with SppS jet data and then extrapolated for comparison with Tevatron and LHC jet data. In addition, the jet production model from the present study is combined with a parametrization of p-p fragmentation functions to predict the minimum-bias jet fragment contribution to hadron $p_t$ spectra. The prediction is compared with published p-p spectrum data to test the self-consistency of the model.
description: 10 pages, 10 figures
Charge radii of $^{55,56}$Ni reveal a surprisingly similar behavior at $N=28$ in Ca and Ni isotopes
Creators: name: Sommer, F.
name: König, K.
name: Rossi, D. M.
name: Everett, N.
name: Garand, D.
name: de Groote, R. P.
name: Holt, J. D.
name: Imgram, P.
name: Incorvati, A.
name: Kalman, C.
name: Klose, A.
name: Lantis, J.
name: Liu, Y.
name: Miller, A. J.
name: Minamisono, K.
name: Miyagi, T.
name: Nazarewicz, W.
name: Nörtershäuser, W.
name: Pineda, S. V.
name: Powel, R.
name: Reinhard, P. -G.
name: Renth, L.
name: Romero-Romero, E.
name: Roth, R.
name: Schwenk, A.
name: Sumithrarachchi, C.
name: Teigelhöfer, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Nuclear charge radii of $^{55,56}$Ni were measured by collinear laser spectroscopy. The obtained information completes the behavior of the charge radii at the shell closure of the doubly magic nucleus $^{56}$Ni. The trend of charge radii across the shell closures in calcium and nickel is surprisingly similar despite the fact that the $^{56}$Ni core is supposed to be much softer than the $^{48}$Ca core. The very low magnetic moment $μ(^{55}\mathrm{Ni})=-1.108(20)\,μ_N$ indicates the impact of M1 excitations between spin-orbit partners across the $N,Z=28$ shell gaps. Our charge-radii results are compared to \textit{ab initio} and nuclear density functional theory calculations, showing good agreement within theoretical uncertainties.