cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Speculative Analysis for Quality Assessment of Code Comments
Creators: name: Rani, Pooja
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Previous studies have shown that high-quality code comments assist developers in program comprehension and maintenance tasks. However, the semi-structured nature of comments, unclear conventions for writing good comments, and the lack of quality assessment tools for all aspects of comments make their evaluation and maintenance a non-trivial problem. To achieve high-quality comments, we need a deeper understanding of code comment characteristics and the practices developers follow. In this thesis, we approach the problem of assessing comment quality from three different perspectives: what developers ask about commenting practices, what they write in comments, and how researchers support them in assessing comment quality. Our preliminary findings show that developers embed various kinds of information in class comments across programming languages. Still, they face problems in locating relevant guidelines to write consistent and informative comments, verifying the adherence of their comments to the guidelines, and evaluating the overall state of comment quality. To help developers and researchers in building comment quality assessment tools, we provide: (i) an empirically validated taxonomy of comment convention-related questions from various community forums, (ii) an empirically validated taxonomy of comment information types from various programming languages, (iii) a language-independent approach to automatically identify the information types, and (iv) a comment quality taxonomy prepared from a systematic literature review.
description: 5 pages, 1 figure, conference
Ζητήματα φύλου στο διεθνές νομικό καθεστώς προστασίας των προσφύγων
Creators: name: Καλλιντέρη, Χαρά Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Πρόσφυγες
Φύλο
Άσυλο
Refugees
Gender
Asylum

description: Η παρούσα εργασία έχει σαν αντικείμενο της την διερεύνηση του παράγοντα φύλου στο διεθνές καθεστώς προστασίας των προσφύγων. Συγκεκριμένα εξετάζεται, ποια είναι τα ουσιαστικού δικαίου εμπόδια που παρουσιάζονται κατά την εξέταση αιτημάτων ασύλου λόγω δίωξης που σχετίζεται με το φύλο του αιτούντος. Ακολουθώντας την δομή του ορισμού του πρόσφυγα, όπως αυτός διατυπώνεται στην Σύμβαση της 28.4.1951 για το Καθεστώς των Προσφύγων, η ανάλυση γίνεται σε τρία επίπεδα έκφανσης της προβληματικής του φύλου στη χορήγηση ασύλου. Σε πρώτο επίπεδο εξετάζεται ο παράγοντας φύλο στο επίπεδο της δίωξης, της πρόκλησης σοβαρής βλάβης που να δικαιολογεί το φόβο του αιτούντα, σε δεύτερο επίπεδο αναλύεται η προϋπόθεση της αποτυχίας της κρατικής προστασίας και τέλος μελετάται η απόδοση της υφιστάμενης δίωξης σε έναν από τους απαριθμημένους λόγους της Σύμβασης. Στο πλαίσιο αυτό γίνεται αναφορά στις κατευθυντήριες οδηγίες της Ύπατης Αρμοστείας αλλά και σε περιφερειακά και εθνικά εργαλεία, ενώ εξετάζονται παράλληλα επί μέρους θεωρητικές προσεγγίσεις στα ανωτέρω ζητήματα και αξιολογούνται οι προτεινόμενες λύσεις.
description: This work aims to investigate the role of gender in the international refugee protection regime. Specifically it considers the substantive law obstacles encountered in the process of asylum determination in the case of gender related asylum claims. Following the structure of the refugee definition as laid down in the 28.04.1951 Convention on the Status of Refugees, the analysis is done on three main levels. On a first level the issue of gender is looked upon in connection with persecution, if and when gender persecution constitutes serious harm, on a second level we look upon failure of state protection as a prerequisite for the award of asylum protection, and finally we study the enumerated grounds of Convention upon which a gender related asylum claim can potentially be based. In this context, reference is made to the guidelines of UNHCR but also to relative regional and national tools. At the same time we examine a number of theoretical approaches to these issues and evaluate proposed solutions.
The Cultural Evolution of Socially Situated Cognition
Creators: name: Gabora, Liane
Publisher: name: arXiv
Year: 2008
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Neurons and Cognition (q-bio.NC)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Because human cognition is creative and socially situated, knowledge accumulates, diffuses, and gets applied in new contexts, generating cultural analogs of phenomena observed in population genetics such as adaptation and drift. It is therefore commonly thought that elements of culture evolve through natural selection. However, natural selection was proposed to explain how change accumulates despite lack of inheritance of acquired traits, as occurs with template-mediated replication. It cannot accommodate a process with significant retention of acquired or horizontally (e.g. socially) transmitted traits. Moreover, elements of culture cannot be treated as discrete lineages because they constantly interact and influence one another. It is proposed that what evolves through culture is the mind; ideas and artifacts are merely reflections of its current evolved state. Interacting minds transform (in part) through through a non-Darwinian autopoietic process similar to that by which early life evolved, involving not survival of the fittest but actualization of their potential.
Μια μετα-δραματική προσσέγγιση του Ατρέα στο Θυέστη του Σενέκα
Creators: name: Καμψιάδης, Τριαντάφυλλος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Θυέστης
Σενέκας
μετα-δράμα
Thyestes
Seneca
meta-dramatic

description: Ο Θυέστης του Σενέκα εμπεριέχει μια σειρά από στοιχεία που καταδεικνύουν τη φύση του ως δραματικού έργου. Ο Ατρέας, αναλαμβάνει τον ρόλο του δημιουργού/ποιητή και επινοεί το σχέδιο εκδίκησης εναντίον του αδελφού του το οποίο αποκτά τα χαρακτηριστικά ενός ένθετου έργου. Κατά την εκτέλεση του σχεδίου ο Ατρέας υποδύεται τον ρόλο του σπλαχνικού και ευγενικού αδελφού καλώντας τον αδελφό του να επιστρέψει από την εξορία, ενώ ταυτόχρονα παραθέτει ένα συμπόσιο για να τιμήσει την συμφιλίωσή τους. Στο πλαίσιο της τελετής της θυσίας ο Ατρέας δολοφονεί τα παιδιά του Θυέστη, τεμαχίζει τα άψυχά σώματά τους και τα προσφέρει ως γεύμα στον αδελφό του. Το σχέδιο εκδίκησης του Ατρέα προϋποθέτει την ανάληψη διαφορετικών ρόλων η οποία διαπιστώνεται όχι μόνο κατά την διάρκεια του δείπνου, αλλά και κατά την αφήγηση της θυσίας. Στην αφήγηση αυτή ο Ατρέας υποδύεται και εκτελεί τους διαφορετικούς ρόλους του ιερέα, του δήμιου και του μάγειρα. Με το σχέδιο αυτό ο Ατρέας εκδικείται τον Θυέστη για τη σχέση με τη σύζυγό του Αερόπη, η οποία δημιούργησε σοβαρές αμφιβολίες στον Ατρέα αναφορικά με την πατρότητα των δύο γιών του: του Αγαμέμνονα και του Μενελάου. Με το πέρας της εκδίκησης ο Ατρέας παραδόξως διατυπώνει την άποψη πως τα παιδιά είναι δικά του και ότι εν τέλει ο γάμος του με την Αερόπη είναι αγνός. ΄Ετσι καθίσταται εμφανής και η σύνδεση του μετα-δραματικού στοιχείου με την αναζήτηση της αλήθειας με απώτερο σκοπό τη διασφάλιση της σταθερότητας στον οίκο (βλ. Schiesaro, 2003).
description: Seneca’s Thyestes is a highly self-conscious play, containing elements that direct attention to its status as drama. Atreus assumes the role of poet and devises a meta-dramatic scheme against his brother Thyestes. In performing this scheme Atreus assumes the role of lenient and gentle brother, inviting his brother to return from exile and organizing a feast to honor the reconciliation between them. However, in a sacrificial setting Atreus murders Thyestes’ children, cuts them into pieces and offers them as a meal to his brother during the feast. The assumption of roles by Atreus is observed not only in the performance of the scheme but also in the narration of the sacrifice, as he acts out the distinct roles of priest, butcher and cook. With the performance of his scheme Atreus exacts terrible vengeance on Thyestes for having had an affair with his wife Aerope, an affair which led Atreus to have serious doubts regarding the paternity of Agamemnon and Menelaus, his two sons. Having taken revenge, Atreus strangely believes that his children are ultimately his and that his marriage to Aerope is pure. He thus ultimately links meta-drama with the search for truth and the stability of his domus (see Schiesaro, 2003).
Thermodynamic considerations on a class of dislocation-based constitutive models
Creators: name: Wu, Ronghai
name: Zaiser, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Dislocations are the main carriers of plastic deformation in crystalline materials. Physically based constitutive equations of crystal plasticity typically incorporate dislocation mechanisms, using a dislocation density based description of dislocation microstructure evolution and plastic flow. Typically, such constitutive models are not formulated in a thermodynamic framework. Nevertheless, fundamental considerations of thermodynamic consistency impose constraints on the admissible range of model parameters and/or on the range of application of such models. In particular, it is mandatory to ensure that the internal energy increase associated with dislocation accumulation is properly accounted for in the local energy balance. We demonstrate on some examples taken from the literature how failure to do so can lead to constitutive equations that violate the first and second laws of thermodynamics either generally or in some particular limit cases, and we discuss how to formulate constraints that recover thermodynamic consistency.
Alfven Waves and Turbulence in the Solar Atmosphere and Solar Wind
Creators: name: Verdini, A.
name: Velli, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We solve the problem of propagation and dissipation of Alfvenic turbulence in a model solar atmosphere consisting of a static photosphere and chromosphere, transition region, and open corona and solar wind, using a phenomenological model for the turbulent dissipation based on wave reflection. We show that most of the dissipation for a given wave-frequency spectrum occurs in the lower corona, and the overall rms amplitude of the fluctuations evolves in a way consistent with observations. The frequency spectrum, for a Kolmogorov-like slope, is not found to change dramatically from the photosphere to the solar wind, however it does preserve signatures of transmission throughout the lower atmospheric layers, namely oscillations in the spectrum at high frequencies reminiscent of the resonances found in the linear case. These may disappear once more realistic couplings for the non-linear terms are introduced, or if time-dependent variability of the lower atmospheric layer is introduced.
description: 27 pages, 9 figures, accepted for publication in ApJ
Self-organized network evolution coupled to extremal dynamics
Creators: name: Garlaschelli, Diego
name: Capocci, Andrea
name: Caldarelli, Guido
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: The interplay between topology and dynamics in complex networks is a fundamental but widely unexplored problem. Here, we study this phenomenon on a prototype model in which the network is shaped by a dynamical variable. We couple the dynamics of the Bak-Sneppen evolution model with the rules of the so-called fitness network model for establishing the topology of a network; each vertex is assigned a fitness, and the vertex with minimum fitness and its neighbours are updated in each iteration. At the same time, the links between the updated vertices and all other vertices are drawn anew with a fitness-dependent connection probability. We show analytically and numerically that the system self-organizes to a non-trivial state that differs from what is obtained when the two processes are decoupled. A power-law decay of dynamical and topological quantities above a threshold emerges spontaneously, as well as a feedback between different dynamical regimes and the underlying correlation and percolation properties of the network.
description: Accepted version. Supplementary information at http://www.nature.com/nphys/journal/v3/n11/suppinfo/nphys729_S1.html
Bernstein-Greene-Kruskal approach for the quantum Vlasov equation
Creators: name: Haas, Fernando
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The one-dimensional stationary quantum Vlasov equation is analyzed using the energy as one of the dynamical variables, similarly as in the solution of the Vlasov-Poisson system by means of the Bernstein-Greene-Kruskal method. In the semiclassical case where quantum tunneling effects are small, an infinite series solution is developed and shown to be immediately integrable up to a recursive chain of quadratures in position space only. { As it stands, the treatment of the self-consistent, Wigner-Poisson system is beyond the scope of the method, which assumes} a given smooth { time-independent} external potential. Accuracy tests for the series expansion are also provided. Examples of anharmonic potentials are worked out up to a high order on the quantum diffraction parameter.
Απόψεις και αντιλήψεις καθηγητών δευτεροβάθμιας εκπαίδευσης και ακαδημαϊκών για τη διδασκαλία ιστορικών συγκρουσιακών θεμάτων
Creators: name: Αναστασιάδου, Ανατολή Ανδρέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: ιστορικά συγκρουσιακά θέματα
απόψεις και αντιλήψεις καθηγητών δευτεροβάθμιας εκπαίδευσης
απόψεις και αντιλήψεις ακαδημαϊκών καθηγητών
historical controversial issues
secondary education school teachers’ views and perceptions
University professors’ views and perceptions

description: Η παρούσα έρευνα αποσκοπεί στη διερεύνηση των απόψεων και των αντιλήψεων των καθηγητών δευτεροβάθμιας εκπαίδευσης για τη διδασκαλία συγκρουσιακών θεμάτων στο μάθημα της Ιστορίας. Παράλληλα, διερευνώνται οι απόψεις και οι αντιλήψεις των ακαδημαϊκών καθηγητών για τη διδασκαλία ιστορικών συγκρουσιακών θεμάτων στην τριτοβάθμια εκπαίδευση, με απώτερο στόχο, μέσα από τη συγκριτική μελέτη τους και τον εντοπισμό διαφορών στις απόψεις και τις αντιλήψεις τους, να ερμηνεύσουμε καλύτερα τα αίτια της προθυμίας, της επιφύλαξης ή της απροθυμίας των καθηγητών των δύο διαφορετικών βαθμίδων να διδάξουν ιστορικά συγκρουσιακά θέματα. Προκειμένου να συλλάβουμε τις σύνθετες και διαφορετικές απόψεις και αντιλήψεις, τις βιωματικές εμπειρίες και τις διαφορετικές οπτικές καθηγητών δευτεροβάθμιας εκπαίδευσης και ακαδημαϊκών καθηγητών, που συμμετέχουν στην έρευνα, υιοθετήσαμε μια ποιοτική προσέγγιση. Το μεθοδολογικό εργαλείο, που χρησιμοποιήσαμε για τη συλλογή των ερευνητικών δεδομένων μας, είναι η ημι-δομημένη συνέντευξη. Μέσα από τη συγκριτική μελέτη, τον εντοπισμό διαφορών και την ερμηνεία τους, επιδιώκουμε να εντοπίσουμε το πρόβλημα που υπάρχει στη δευτεροβάθμια εκπαίδευση σχετικά με το ρόλο του εκπαιδευτικού και τη μορφωτική αποστολή του σχολείου.
description: The purpose of this research is to explore secondary education school teachers’ perceptions and views in regard to teaching controversial issues in the subject of History. At the same time University professors’ perceptions and views concerning teaching historical controversial issues at University are explored. The main aim is, through comparative study and identification of differences in views and perceptions, to interpret the reasons why secondary education school teachers and University professors are willing, sceptical or unwilling to teach historical controversial issues. In order to capture the complexity and diversity of teachers’ and University professors’ views, perceptions, experiences and different perspectives, a qualitative approach was adopted. The semi-structured interview was selected as the method for data collection. Through comparative study, identification of the differences and their interpretation, we aspire to emphasize the problem which exists in secondary education concerning both the teacher’s role as well as the school’s educational mission.
On Universal Halos and the Radial Orbit Instability
Creators: name: MacMillan, Joseph D.
name: Widrow, Lawrence M.
name: Henriksen, Richard N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The radial orbit instability drives dark matter halos toward a universal structure. This conclusion, first noted by Huss, Jain, and Steinmetz, is explored in detail through a series of numerical experiments involving the collapse of an isolated halo into the non-linear regime. The role played by the radial orbit instability in generating the density profile, shape, and orbit structure is carefully analyzed and, in all cases, the instability leads to universality independent of initial conditions. New insights into the underlying physics of the radial orbit instability are presented.
description: 31 pages, 11 figures, submitted to the Astrophysical Journal
Relativistic Ermakov-Milne-Pinney Systems and First Integrals
Creators: name: Haas, Fernando
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: The Ermakov-Milne-Pinney equation is ubiquitous in many areas of physics that have an explicit time-dependence, including quantum systems with time dependent Hamiltonian, cosmology, time-dependent harmonic oscillators, accelerator dynamics, etc. The Eliezer and Gray physical interpretation of the Ermakov-Lewis invariant is applied as a guiding principle for the derivation of the special relativistic analog of the Ermakov-Milne-Pinney equation and associated first integral. The special relativistic extension of the Ray-Reid system and invariant is obtained. General properties of the relativistic Ermakov-Milne-Pinney are analyzed. The conservative case of the relativistic Ermakov-Milne-Pinney equation is described in terms of a pseudo-potential, reducing the problem to an effective Newtonian form. The non-relativistic limit is considered as well. A relativistic nonlinear superposition law for relativistic Ermakov systems is identified. The generalized Ermakov-Milne-Pinney equation has additional nonlinearities, due to the relativistic effects.
Functional form of the generalized gradient approximation for exchange: The PBE$α$ functional
Creators: name: Madsen, Georg K. H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A new functional form for the exchange enhancement in the generalized gradient approximation within density functional theory is given. The functional form satisfies the constraints used to construct the Perdew-Burke-Ernzerhof (PBE) functional but can be systematically varied using one parameter. This gives the possibility to estimate the reliability of a computational result or to fit the parameter for a certain problem. Compared to other semi-empirical functionals, the present has the advantage that only one physically transparent parameter is used and that the fitted functional will obey the same exact conditions as PBE functional. Furthermore the simple form of the exchange enhancement means that oscillating terms in the exchange potential are avoided.
Υπαίθρια γλυπτά της Θεσσαλονίκης, παράμετροι υποβάθμισης και φθοράς των υλικών τους.
Creators: name: Ορφανίδης, Δωρόθεος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Υπαίθρια Γλυπτική Θεσσαλονίκης
Αίτια Φθοράς
Καταγραφή γλυπτών
Outdoor Sculptures of Thessaloniki
Causes of Degradation
Registration of Outdoor Sculptures

description: Στην παρούσα διπλωματική εργασία γίνεται καταγραφή των παραμέτρων υποβάθμισης και φθοράς των υπαίθριων γλυπτών της Θεσσαλονίκης. Αρχικά δίνονται στοιχεία για το κλίμα της Θεσσαλονίκης σε συνάρτηση με όλους εκείνους τους παράγοντες επιτάχυνσης της υποβάθμισης και διάβρωσης των υπαίθριων γλυπτών, όπως η θερμοκρασία, ο άνεμος και η υγρασία. Στη συνέχεια, περιγράφεται η διαδικασία που ακολουθείται στην επιστήμη της συντήρησης, η οποία περιλαμβάνει την καταγραφή και τη φωτογράφιση και δίνονται χρήσιμες πληροφορίες για τις βασικές πρώτες ύλες των γλυπτών, όπως το μέταλλο, το μάρμαρο, η πέτρα και ο ύαλος. Επιπλέον, και αφού γίνει καταγραφή των υλικών, με τα συμπτώματα φθοράς και τους λόγους υποβάθμισης, γίνεται και καταγραφή της διαδικασίας αποκατάστασης των υλικών. Σημαντικό ρόλο στο εκτεθειμένο υλικό παίζει και η βιοδιάβρωση που προκαλείται από τα βρύα και τους λειχήνες. Η εργασία κλείνει με τις λεγόμενες καρτέλες-ταυτότητες των γλυπτών, που περιλαμβάνουν φωτογραφίες και αναλυτικά στοιχεία.
description: The purpose of this thesis is to record the parameters of degradation and deterioration of the materials of the outdoor sculptures of Thessaloniki. The thesis begins with Thessalonikis’ climate which is studied in relation with all the acceleration factors of deterioration and corrosion of outdoor sculptures, such as temperature, wind and humidity. Then, the procedure that the conservation science follows is presented, which includes recording and photographing followed by useful information on basic raw material of sculptures, such as metal, marble, stone and glass. Furthermore and after an inventory of materials has been done, with the symptoms of wear and the reasons of deterioration, it is examined the restoration process of the material. Important role in the exposed material also plays the bioerosion with mosses and lichens. The thesis ends with the so-called context sheets of the sculptures, which include photographs and thorough details of them.
Precise determination of $B_K$ and light quark masses in quenched domain-wall QCD
Creators: name: Nakamura, Yousuke
name: Aoki, Sinya
name: Taniguchi, Yusuke
name: Yoshié, Tomoteru
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We calculate non-perturbative renormalization factors at hadronic scale for $ΔS=2$ four-quark operators in quenched domain-wall QCD using the Schrödinger functional method. Combining them with the non-perturbative renormalization group running by the Alpha collaboration, our result yields the fully non-perturbative renormalization factor, which converts the lattice bare $B_K$ to the renormalization group invariant (RGI) $\hat{B}_K$. Applying this to the bare $B_K$ previously obtained by the CP-PACS collaboration at $a^{-1}\simeq 2, 3, 4$ GeV, we obtain $\hat{B}_K=0.782(5)(7)$ (equivalent to $B_K^{\bar{\rm MS}}({\rm NDR}, 2 {\rm GeV}) = 0.565(4)(5)$ by 2-loop running) in the continuum limit, where the first error is statistical and the second is systematic due to the continuum extrapolation. Except the quenching error, the total error we have achieved is less than 2%, which is much smaller than the previous ones. Taking the same procedure, we obtain $m_{u,d}^{\rm RGI}=5.613(66)$ MeV and $m_s^{\rm RGI}=147.1(17)$ MeV (equivalent to $m_{u,d}^{\bar{\rm MS}}(2 {\rm GeV})=4.026(48)$ MeV and $m_{s}^{\bar{\rm MS}}(2 {\rm GeV})=105.6(12)$ MeV by 4-loop running) in the continuum limit.
description: 51 pages, 27 Postscript figures, corrected typos, added reference
Additional file 1 of NtbHLH1, a JAF13-like bHLH, interacts with NtMYB6 to enhance proanthocyanidin accumulation in Chinese Narcissus
Creators: name: Fan, Yuxin
name: Peng, Jiayu
name: Wu, Jiacheng
name: Zhou, Ping
name: He, Ruijie
name: Allan, Andrew C.
name: Zeng, Lihui
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1.
Light Dark Matter Annihilations into Two Photons
Creators: name: Boehm, C.
name: Orloff, J.
name: Salati, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We compute the pair annihilation cross section of light (spin-0) dark matter particles into two photons and discuss the detectability of the monochromatic line associated with these annihilations.
description: 7 pages
Parameter Testing in Spark
Creators: name: Πετρίδης, Παναγιώτης Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Παράμετροι
Αντίκτυπος
Ρύθμιση
Spark
Parameter
Tuning

description: Στα πλαίσα αυτής της εργασίας έγινε μια προσπάθεια προσδιοριστεί ο αντίκτυπος κάποιων παραμέτρων του Apache Spark 1.5.2 στην επίδοση εφαρμογών. Κατι τέτοιο , απο οσο γνωρίζουμε είναι η πρώτη, ή μια από τις πρώτες προσπάθειες πανω στο θέμα αυτο. Επειδή ο αριθμός των παραμέτρων είναι εκτενής, ξεχωρίζουμε στην δουλειά μας αυτες οι οποίες θεωρητικά εχουν τον μεγαλύτερο αντίκτυπο βάση της περιγραφής τους , ενω παράλληλα λαμβάνουμε υποψη σεναρια στα οποία ειναι πιθανό να επηρρεασουν την απόδοση. Στην συνέχεια διεξάγουμε μια σειρά πειραματων πανω σε γνωστές εφαρμογές στον υπερυπολογιστή MareNostrum προκειμένου να προσδιορισουμε τον αντίκτυπο και την ευσαισθησία των επιλεγμένων παραμέτρων και παρουσιάζουμε τα αποτελέσματα μας καθως και τα συμπεράσματα μας. Τέλος, προτείνουμε μια μεθοδολογία για τη ρύθμιση των παραμέτρων του Apache Spark, η οποία όταν εφαρμόζεται σε μια εφαρμογή μπορεί να επιφέρει καλυτερη απόδοση.
description: In this work attempts are made to identify the impact that certain parameters of Apache Spark’s 1.5.2 configuration have on the overall performance of applications. To our knowledge this is the first, or one of the first ventures on this subject. Since the number of the parameters is extensive, we identify those that theoretically have the greatest impact based on their documentation, while taking into consideration possible scenarios that would affect the performance. We conduct a series of experiments with known benchmarks on the MareNostrum petascale supercomputer in order to test the performance sensitivity and impact of the selected parameters and present our results and conclusions. Finally , we offer a methodology for tuning Apaches Spark parameters that when applied to an application may yield better performance.
KMTNet Nearby Galaxy Survey III. Deficient H$α$ flux in the Extended Disks of Spiral Galaxies
Creators: name: Byun, Woowon
name: Sheen, Yun-Kyeong
name: Seon, Kwang-Il
name: Ho, Luis C.
name: Lee, Joon Hyeop
name: Jeong, Hyunjin
name: Kim, Sang Chul
name: Park, Byeong-Gon
name: Lee, Yongseok
name: Cha, Sang-Mok
name: Ko, Jongwan
name: Kim, Minjin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We perform a deep wide-field imaging survey of nearby galaxies using H$α$ and broadband filters to investigate the characteristics of star formation in galaxies. Motivated by the finding that star formation rates (SFRs) derived from H$α$ fluxes in dwarf galaxies are systematically lower than those inferred from far-ultraviolet (FUV) fluxes, we attempt to determine whether the same trend exists in the extended disks of two star-forming galaxies. We perform spatially resolved photometry using grid-shaped apertures to measure the FUV and H$α$ fluxes of star-forming regions. We also perform spectral energy distribution (SED) fittings using 11 photometric data (FUV-to-MIR) including data from the literature to estimate the local properties such as internal attenuation of individual star-forming clumps. Comparing SFR$_\mathrm{FUV}$ and SFR$_\mathrm{Hα}$, which are converted from the H$α$ and FUV fluxes corrected for the local properties, we find that SFR$_\mathrm{Hα}$/SFR$_\mathrm{FUV}$ tends to decrease as the SFR decreases. We evaluate possible causes of this discrepancy between the two SFRs by restricting parameters in the SED fitting and conclude that deficient H$α$ fluxes in the extended disks of galaxies are tightly correlated with recent starbursts. The strong and short starburst which is being rapidly suppressed over the last 10 Myr seems to induce a significant discrepancy between the SFR$_\mathrm{Hα}$ and SFR$_\mathrm{FUV}$. In addition, the recent bursts in the extended disks of galaxies appear to have occurred azimuth-symmetrically, implying that these were likely triggered by gas accretion or internal processes rather than external perturbation.
description: 17 pages, 13 figures, Accepted for publication in ApJ
Inconsistencies in the MIT bag model of hadrons
Creators: name: Lavenda, B. H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It is shown that what is commonly referred to as the MIT `bag' model of hadrons is thermodynamically wrong: The adiabatic conditions between pressure and temperature, and between pressure and volume imply the third, an adiabatic relation between temperature and volume. Consequently, the bag model is destitute of any predictive power since it reduces to a single adiabatic state. The virial theorems proposed by the MIT group are shown to be the result of the normal power density of states of a non-degenerate gas and not the exponential density of states of the Hagedorn mass spectrum. A number of other elementary misconceptions and inaccuracies are also pointed out.
description: 9 pages
Elektrische Charakterisierung und Modellierung von Festkörperbatterien
Creators: name: Braun, Philipp
Publisher: name: KIT Scientific Publishing
Year: 2019
Subjects: Festkörperbatterie
Kompositelektroden
Kettenleitermodell
Ragone-Diagramm
all-solid-state battery
composite electrodes
transmission line model
Ragone-diagram

description: Um zukünftige Anforderungen an Batterien erfüllen zu können, müssen heutige Lithium-Ionen Batterien weiterentwickelt werden. Ein vielversprechender Ansatz, der die Steigerung von Energie- und Leistungsdichte verspricht, ist die Lithium-Ionen Festkörperbatterie. In dieser Arbeit wird ein Ersatzschaltbild-basiertes Modell, sowie dessen Parametrierung vorgestellt, welches die Energie-/Leistungsdichte einer Festkörperbatterie abhängig von Material, Geometrie und Mikrostruktur berechnen kann.
From Neuron to Neural Networks dynamics
Creators: name: Cessac, B.
name: Samuelides, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: This paper presents an overview of some techniques and concepts coming from dynamical system theory and used for the analysis of dynamical neural networks models. In a first section, we describe the dynamics of the neuron, starting from the Hodgkin-Huxley description, which is somehow the canonical description for the ``biological neuron''. We discuss some models reducing the Hodgkin-Huxley model to a two dimensional dynamical system, keeping one of the main feature of the neuron: its excitability. We present then examples of phase diagram and bifurcation analysis for the Hodgin-Huxley equations. Finally, we end this section by a dynamical system analysis for the nervous flux propagation along the axon. We then consider neuron couplings, with a brief description of synapses, synaptic plasticiy and learning, in a second section. We also briefly discuss the delicate issue of causal action from one neuron to another when complex feedback effects and non linear dynamics are involved. The third section presents the limit of weak coupling and the use of normal forms technics to handle this situation. We consider then several examples of recurrent models with different type of synaptic interactions (symmetric, cooperative, random). We introduce various techniques coming from statistical physics and dynamical systems theory. A last section is devoted to a detailed example of recurrent model where we go in deep in the analysis of the dynamics and discuss the effect of learning on the neuron dynamics. We also present recent methods allowing the analysis of the non linear effects of the neural dynamics on signal propagation and causal action. An appendix, presenting the main notions of dynamical systems theory useful for the comprehension of the chapter, has been added for the convenience of the reader.
description: 81 pages, 91 figures, review paper
Feasibility study of TPC detector at high luminosity $Z$ pole on the circular collider
Creators: name: Yuan, Zhiyang
name: Qi, Huirong
name: Chang, Yue
name: Wu, Ye
name: Zhang, Hongyu
name: Zhang, Jian
name: Chen, Yuanbo
name: Cai, Yiming
name: Li, Yulan
name: Deng, Zhi
name: Gong, Hui
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: With the development of the circular collider, it is necessary to make accurate physics experimental measurements of particle properties at higher luminosity $Z$ pole. Micro-pattern gaseous detectors (MPGDs), which contain Gaseous Electron Multiplier (GEM) and Micro-mesh gaseous structures (Micromegas), have excellent potential for development as the readout devices of the time projection chamber (TPC) tracker detector. To meet the updated physics requirements of the high luminosity $Z$ from the preliminary concept design report (preCDR) to concept design report (CDR) at the circular electron positron collider (CEPC), In this paper, the space charge distortion of the TPC detector is simulated with the CEPC beam structure. Using the multi-physics simulation software package, the distribution of ion estimated by Geant4 is used as the input for the differential equation, and the relationship between the ion density distribution and electric field in the detector chamber is simulated. These simulation results show that the maximum deviation for Higgs $\mathcal{O}$(25 $μ$m) meets the performance requirements in CEPC TPC detector at the high luminosity $Z$ pole, while it is still a considerable challenge for $Z$ pole, with the maximum deviation $\mathcal{O}$($>100~μ$m). According to the previous developments, the cascaded structure of GEM and Micromegas detector has been measured. The new considerations of the detector's requirements were given, the gain needs to be reached to about 2000 with IBF$\times$Gain under 0.1, and IBF means the ions back flow ratio of the detector. The pixel TPC is a potential option to replace the traditional MPGDs with the low gain, low occupancy, and outstanding pattern recognition. Finally, some update parameters and experiments results were compared.
description: 7 pages, 8 png figures
N-body Models of Rotating Globular Clusters
Creators: name: Ernst, Andreas
name: Glaschke, Patrick
name: Fiestas, Jose
name: Just, Andreas
name: Spurzem, Rainer
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have studied the dynamical evolution of rotating globular clusters with direct $N$-body models. Our initial models are rotating King models; we obtained results for both equal-mass systems and systems composed out of two mass components. Previous investigations using a Fokker-Planck solver have revealed that rotation has a noticeable influence on stellar systems like globular clusters, which evolve by two-body relaxation. In particular, it accelerates their dynamical evolution through the gravogyro instability. We have validated the occurence of the gravogyro instability with direct $N$-body models. In the case of systems composed out of two mass components, mass segregation takes place, which competes with the rotation in the acceleration of the core collapse. The "accelerating" effect of rotation has not been detected in our isolated two-mass $N$-body models. Last, but not least, we have looked at rotating $N$-body models in a tidal field within the tidal approximation. It turns out that rotation increases the escape rate significantly. A difference between retrograde and prograde rotating star clusters occurs with respect to the orbit of the star cluster around the Galaxy, which is due to the presence of a ``third integral'' and chaotic scattering, respectively.
description: 16 pages, 17 figures, accepted by MNRAS
Sustained Comoving Acceleration of Overdense Plasmas by Colliding Laser Pulses
Creators: name: Liang, Edison
Publisher: name: arXiv
Year: 2006
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We review recent PIC simulation results which show that double-sided irradiation of a thin over- dense plasma slab by ultra-intense laser pulses from both sides can lead to sustained comoving acceleration of surface electrons to energies much higher than the conventional ponderomotive limit. The acceleration stops only when the electrons drift transversely out of the laser beam. We show latest 2.5D results of parameter studies based on finite laser spot size and discuss future laser experiments that can be used to test these results.
description: 10 pages 7 figures to appear in ICFA Taipei Conference Proceedings, ed. Nakajima (World Scientific 2006)
Additional file 1 of A machine learning framework that integrates multi-omics data predicts cancer-related LncRNAs
Creators: name: Yuan, Lin
name: Zhao, Jing
name: Sun, Tao
name: Shen, Zhen
Publisher: name: figshare
Year: 2021
Subjects: subject: Statistics
subject: FOS: Mathematics
subject: Artificial Intelligence and Image Processing
subject: FOS: Computer and information sciences

description: Additional file 1: Figure S1. The data processing procedure for disease-lncRNA association instances. Figure S2. The AUC values for 10 realizations on the dataset with 10% incorrect data. Figure S3. The box plots from 50 random splits experiment on a dataset with 10% incorrect data. Table S1. The experimental results on a dataset lacking some omics data. Table S2. The supporting literature of Top 15 gastric cancer-associated LncRNAs predicted by LGDLDA. Table S3. The confirmed databases of Top 15 breast cancer-associated LncRNAs predicted by LGDLDA. Table S4. The supporting literature of Top 15 breast cancer-associated LncRNAs predicted by LGDLDA. Table S5. The confirmed databases of Top 15 prostate cancer-associated LncRNAs predicted by LGDLDA. Table S6. The supporting literature of Top 15 prostate cancer-associated LncRNAs predicted by LGDLDA. Table S7. Summary of data sets used by each matrix.
Η σύμβαση ιατρικής αγωγής
Creators: name: Σακόγλου, Ειρήνη Σάββα
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Συμβατικές υποχρεώσεις
Γιατρός
Σύμβαση παροχής υπηρεσιών
Contractual obligations
Doctor
Service contract

description: Σκοπός της διατριβής είναι η μελέτη της σύμβασης ιατρικής αγωγής και γενικότερα της έννομης σχέσης μεταξύ γιατρού και ασθενούς. Αρχικά γίνεται αναφορά στα υποκείμενα της ιατρικής σχέσης, δηλαδή από τη μία πλευρά στον ασθενή, και ιδιαίτερα στην περίπτωση που δεν είναι σε θέση να καταρτίσει σύμβαση λόγω έλλειψης δικαιοπρακτικής ικανότητας, και από την άλλη πλευρά στο γιατρό, είτε πρόκειται για ανεξάρτητο επαγγελματία, είτε εργάζεται σε ιδιωτική κλινική ή δημόσιο νοσοκομείο. Επίσης, εξετάζεται η έννομη σχέση ιδιωτικού ή δημοσίου δικαίου που αναπτύσσεται σε κάθε περίπτωση μεταξύ γιατρού και ασθενούς. Στη συνέχεια, η διατριβή πραγματεύεται τη νομική φύση της σύμβασης ιατρικής αγωγής, υποστηρίζοντας τη θέση ότι πρόκειται για σύμβαση παροχής ανεξάρτητων υπηρεσιών. Ένα άλλο θέμα που θίγεται είναι το περιεχόμενό της σύμβασης ιατρικής αγωγής, δηλαδή οι συμβατικές υποχρεώσεις του γιατρού και του ασθενούς. Τέλος, γίνεται αναφορά στους διάφορους τρόπους λύσης της σύμβασης ιατρικής αγωγής και στους λόγους ακυρότητάς της.
description: The aim of the present thesis is to study the contract of providing medical services and generally the legal relationship between doctors and their patients. Initially, we refer to the parts of the legal relationship of medical treatment, which are on the one hand the patient, focusing especially on the case when patients have not the ability to conclude a contract due to lack of legal capacity, and on the other hand the doctor, either they are self-employed, or work in a private clinic or public hospital. Furthermore, we study the legal relationship of private or public law, which is developed between the doctor and the patient. Additionally, the present thesis analyzes the legal nature of the contract which is concluded between doctors and patients, supporting that it is a contract for the provision of independent services. We also examine the content of the contract, as well as the contractual obligations of doctors and patients. Finally, we study multiple ways of terminating the contract of providing medical services and the grounds for invalidy of the contract.
Unequal Error Protection: An Information Theoretic Perspective
Creators: name: Borade, Shashi
name: Nakiboglu, Baris
name: Zheng, Lizhong
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: Discrete Mathematics (cs.DM)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: An information theoretic framework for unequal error protection is developed in terms of the exponential error bounds. The fundamental difference between the bit-wise and message-wise unequal error protection (UEP) is demonstrated, for fixed length block codes on DMCs without feedback. Effect of feedback is investigated via variable length block codes. It is shown that, feedback results in a significant improvement in both bit-wise and message-wise UEP (except the single message case for missed detection). The distinction between false-alarm and missed-detection formalizations for message-wise UEP is also considered. All results presented are at rates close to capacity.
description: 45 pages, 6 figures, Submitted to IEEE Transaction on Information Theory. Corrected typos
Internal strain regulates the nucleotide binding site of the kinesin leading head
Creators: name: Hyeon, Changbong
name: Onuchic, Jose N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Biomolecules (q-bio.BM)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: In the presence of ATP, kinesin proceeds along the protofilament of microtubule by alternated binding of two motor domains on the tubulin binding sites. Since the processivity of kinesin is much higher than other motor proteins, it has been speculated that there exists a mechanism for allosteric regulation between the two monomers. Recent experiments suggest that ATP binding to the leading head domain in kinesin is regulated by the rearward strain built on the neck-linker. We test this hypothesis by explicitly modeling a $C_α$-based kinesin structure whose both motor domains are bound on the tubulin binding sites. The equilibrium structures of kinesin on the microtubule show disordered and ordered neck-linker configurations for the leading and the trailing head, respectively. The comparison of the structures between the two heads shows that several native contacts present at the nucleotide binding site in the leading head are less intact than those in the binding site of the rear head. The network of native contacts obtained from this comparison provides the internal tension propagation pathway, which leads to the disruption of the nucleotide binding site in the leading head. Also, using an argument based on polymer theory, we estimate the internal tension built on the neck-linker to be f~(12-15) pN. Both of these conclusions support the experimental hypothesis.
description: 34 pages, 9 Figures
Additional file 1 of Effects of root dominate over aboveground litter on soil microbial biomass in global forest ecosystems
Creators: name: Jing, Yanli
name: Tian, Peng
name: Wang, Qingkui
name: Li, Weibin
name: Sun, Zhaolin
name: Yang, Hong
Publisher: name: figshare
Year: 2021
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Ecology

description: Additional file 1: Fig. S1. The root removal effect on microbial biomass by trenching and girdling methods. The numbers in the right of figure represents the number of case studies. Fig.S2. Effects of ALR and RE on dissolved organic carbon. The numbers in the right of figure represents the number of case studies. ALR, above-ground litter removal; RE, root exclusion. Table S1. Correlation coefficients of the effect size of sol microbial biomass and F/B ratio to above-ground litter removal (ALR) and root exclusion (RE) with climatic variables and soil properties
Does the complex susceptibility of the Henon map have a pole in the upper-half plane ? A numerical investigation
Creators: name: Cessac, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: It has been rigorously shown in [Ruelle, 2005] that the complex susceptibility of chaotic maps of the interval can have a pole in the upper-half complex plane. We develop a numerical procedure allowing to exhibit this pole from time series. We then apply the same analysis to the Henon map and conjecture that the complex susceptibility has also a pole in the upper-half complex plane.
description: 15 pages, 5 figures, submited
Successive Wyner-Ziv Coding Scheme and its Application to the Quadratic Gaussian CEO Problem
Creators: name: Chen, Jun
name: Berger, Toby
Publisher: name: arXiv
Year: 2006
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We introduce a distributed source coding scheme called successive Wyner-Ziv coding. We show that any point in the rate region of the quadratic Gaussian CEO problem can be achieved via the successive Wyner-Ziv coding. The concept of successive refinement in the single source coding is generalized to the distributed source coding scenario, which we refer to as distributed successive refinement. For the quadratic Gaussian CEO problem, we establish a necessary and sufficient condition for distributed successive refinement, where the successive Wyner-Ziv coding scheme plays an important role.
description: 28 pages, submitted to the IEEE Transactions on Information Theory
Gibbs Paradox and the Concepts of Information, Symmetry, Similarity and Their Relationship
Creators: name: Lin, Shu-Kun
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Information (I) is defined as the amount of the data after data compression. The first law of information theory: the total amount of data L (the sum of entropy S and information I) of an isolated system remains unchanged. The second law of information theory: Information I of an isolated system decreases to a minimum at equilibrium. The third law of information theory: For a solid structure of perfect symmetry (e.g., a perfect crystal), the information I is zero and the (information theory) entropy (called by me as static entropy for solid state) S is at the maximum. Gibbs Paradox has been resolved. Spontaneously mixed substances at gaseous state can be spontaneously separated at condensed phases (solid or liquid states), driving only by information loss or by the increase in (information theory) entropy. None of the typical pure mixing or separation processes are driving by free energy minimization and the free energy (or total amount of chemical potential) has no change during the processes of ideal mixture formation or ideal mixture separation. The thermodynamic entropy change for the formation of ideal mixtures of gases, liquids or solids is always zero.
description: 5 pages, 1 figure