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31.
Anastasios J. Sakalis Nikolaos A. Kazakis Nikolaos Merousis Nestor C. Tsirliganis 《Journal of Cultural Heritage》2013,14(6):485-498
Various types of Late Neolithic decorated pottery excavated in Polyplatanos (Imathia, Greece) such as Crusted (C), Classical Dimini (CD), Black-on-Red (BoR), Cream-on-Red (CoR) and Graphite (G) were archaeometrically studied in order to investigate their provenance and to clarify specific technological features. The clay bodies, the paints and the slips were stereoscopically analyzed, while their elemental composition was determined, using non-destructive multi-elemental micro X-ray fluorescence spectroscopy. Furthermore, the analytical data were statistically treated using multivariate exploratory techniques (Principal Component Analysis, PCA). As a result, novel technological information was derived especially concerning the Crusted type ceramics, which have not been widely examined by archaeometric means up to now, while useful provenance associations were also derived from the statistical combination of the studied groups. 相似文献
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Nikolaos Tselios Nikolaos Avouris Vassilis Komis 《Education and Information Technologies》2008,13(1):55-76
This paper focuses on usability evaluation of information and communication technologies applications in education (ICTE applications).
Various classes of teaching and learning systems are discussed in terms of technologies used and pedagogical approaches. Their
usability is analyzed according to various dimensions and the impact of system usability on the learning effectiveness is
studied. We argue that various classes of ICTE applications such as multimedia/hypermedia applications, open educational environments
and CSCL environments, based on different theoretical perspectives, require fundamentally different approaches in evaluating
their usability. The paper is structured as follows: an overview of different usability evaluation approaches is presented
first, followed by a discussion on applicability of these techniques in various categories of teaching and learning computer
systems. Typical case studies that engage both usability experts and users themselves (students and teachers) are also discussed.
The objective is to describe both the methods, and the way to apply them effectively in order to certify the usability of
an ICTE application with respect to its teaching and learning objectives. 相似文献
34.
Content-based filtering can be deployed for personalised information dissemination on the web, but this is a possibility that has been largely ignored. Nowadays, there are no successful content-based filtering applications available online. Nootropia is an immune-inspired user profiling model for content-based filtering. It has the advantageous property to be able to represent a user’s multiple interests and adapt to a variety of changes in them. In this paper we describe our early efforts to develop real world personalisation services based on Nootropia. We present, the architecture, implementation, usage and evaluation of the personalised news and paper aggregator, which aggregates news and papers that are relevant to an individual’s interests. Our user study shows that Nootropia can effectively learn a user’s interests and identify relevant information. It also indicates that information filtering is a complicated task with many factors affecting its successful application in a real situation. 相似文献
35.
Ioannis Rabias Danai Tsitrouli Eleni Karakosta Thomas Kehagias Georgios Diamantopoulos Michael Fardis Dimosthenis Stamopoulos Thomas G. Maris Polykarpos Falaras Nikolaos Zouridakis Nikolaos Diamantis Georgios Panayotou Dimitrios A. Verganelakis Garyfalia I. Drossopoulou Effie C. Tsilibari Georgios Papavassiliou 《Biomicrofluidics》2010,4(2)
One of the most significant challenges implementing colloidal magnetic nanoparticles in medicine is the efficient heating of microliter quantities by applying a low frequency alternating magnetic field. The ultimate goal is to accomplish nonsurgically the treatment of millimeter size tumors. Here, we demonstrate the synthesis, characterization, and the in vitro as well as in vivo efficiency of a dextran coated maghemite (γ-Fe2O3) ferrofluid with an exceptional response to magnetic heating. The difference to previous synthetic attempts is the high charge of the dextran coating, which according to our study maintains the colloidal stability and good dispersion of the ferrofluid during the magnetic heating stage. Specifically, in vitro 2 μl of the ferrofluid gives an outstanding temperature rise of 33 °C within 10 min, while in vivo treatment, by infusing 150 μl of the ferrofluid in animal model (rat) glioma tumors, causes an impressive cancer tissue dissolution. 相似文献
36.
Morphology of the deltoid muscles in elite tennis players 总被引：1，自引：0，他引：1
Mavidis A Vamvakoudis E Metaxas T Stefanidis P Koutlianos N Christoulas K Karamanlis A Mandroukas K 《Journal of sports sciences》2007,25(13):1501-1506
The aim of this study was to examine the deltoid muscle properties of the dominant and non-dominant arm of Greek professional male tennis players. Eight male tennis players (mean age 22.0 years, s = 3.2) were subjected to biopsy of the deltoid muscle of both arms. Adenosine triphosphate (ATPase) histochemistry and myosin heavy chain (MHC) composition were performed on the samples with homogenate electrophoresis. No significant differences were observed in the percentage of types I, IIa, IIab, and IIb muscle fibres between the deltoid muscles of the two arms. Types I, IIa, and IIx muscle fibres of the dominant and non-dominant deltoid muscles did not differ significantly for MHC isoform composition. Type IIab muscle fibres showed a similar cross-sectional area (CSA) percentage distribution between the two arms. The CSA percentage for types I, IIa, and IIb muscle fibers did not differ significantly between the dominant and the non-dominant arm. We conclude therefore that regular tennis training probably does not lead to any significant changes in the muscle fibre types of the dominant and non-dominant arms of elite tennis players. 相似文献
37.
Argyris G. Toubekis Nikolaos Beidaris Petros G. Botonis Maria Koskolou 《Journal of sports sciences》2017,35(11):1025-1033
The purpose of this study was to examine the metabolic responses during submaximal swimming with self-selected normal breathing (N) and prolonged expiration along with reduced frequency breathing (RB). Ten male swimmers (age: 23.1 ± 2.2 years; VO2max: 47.3 ± 7.2 ml · kg?1 · min?1) performed 75-, 100-, 175-, 200-, 275-, 300-, 375- and 400-m trials with N and RB at intensity corresponding to 90% of the critical speed. In RB condition, all trials longer than 75 m were interspersed with 25 m of self-selected N in regular intervals. In RB, oxygen saturation during recovery was decreased compared to starting values after 75, 100, 175, 275 and 375 m (78–91%, P < 0.05), while it remained unchanged after all trials in N condition (98 ± 2%, P > 0.05). Lactate concentration was higher in RB than in N after 400 m (4.3 ± 1.5 vs. 3.3 ± 1.7 mmol · l?1, P < 0.05). During recovery after the 375-m trial, partial pressure of carbon dioxide was increased and pH was decreased in RB compared to N condition. Prolonged expiration along with RB provokes severe hypoxemia during the recovery period after swimming, which is restored with self-selected N during submaximal swimming. 相似文献
38.
Nikolaos K. Tselios Nikolaos M. Avouris Maria Kordaki 《Education and Information Technologies》2002,7(1):17-40
Design and evaluation of computer-based open problem solving environments is a non-trivial task. Definition of a design framework, which involves a strong field-evaluation phase, has been the subject of the research described in this paper. This framework is based on the concept of student task modeling. Tools to support design and evaluation have been built and used in the frame of this study. The framework and the developed tools have produced promising results during the evaluation of an open problem-solving educational environment. 相似文献
39.
Ioannis Kazanidis Nikolaos Pellas Panagiotis Fotaris Avgoustos Tsinakos 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(4):2014-2027
While “flipping” a classroom has gained attention in K-12 and Secondary school programs, there has been relatively no explicit focus on its effectiveness as a teaching method for instructional media design courses in Higher Education. The purpose of this quasi-experimental study was to determine the effectiveness of the flipped classroom approach to teaching instructional media design subjects by comparing students’ academic performance and training satisfaction in traditional lecture-based instruction with those in a flipped classroom. A total of 128 undergraduate students participated voluntarily and were divided into a control (n = 62) and an experimental (n = 66) group, respectively. The study findings indicated substantial differences in both academic performance and training satisfaction between the two groups, with the students in the experimental group performing significantly better. Specifically, the results showed some determining factors associated with training satisfaction that explain why students in flipped classes achieved notably higher mastery in the learning objectives than their control group peers. This study adds to the literature by providing evidence on how a flipped classroom can potentially benefit students’ academic performance, leading to higher training satisfaction and deeper disciplinary understanding in instructional media design courses. 相似文献
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Thomas Kourtessis Nikolaos Tsigilis Maria Maheridou Theodoros Ellinoudis Michael Kiparissis Efthimis Kioumourtzoglou 《Journal of Early Childhood Teacher Education》2013,34(4):276-286
The purpose of this study was to assess the effectiveness of a short intervention program designed to enhance the educators' ability to identify children with developmental coordination disorder (DCD). Twenty early childhood and 20 physical education teachers (n = 40) participated in the study. Participants were randomly assigned into an experimental group (n = 20) and a control group (n = 20). A 3-week intervention program implemented, which comprised of four 2-hour lectures and two practice sections of the same duration and focused on the issue of DCD within the educational setting. After the completion of the program, each educator evaluated four children's motor performance using the Movement Assessment Battery for Children Checklist (Sugden & Sugden, 1991). Subsequently, another assessment took place using the Movement Assessment Battery for Children. The total number of evaluated children was 160. Results showed that the educators who attended the educational program showed higher identification ability. No significant differences were found between physical education and early childhood teachers of the experimental group. On the contrary, in the control group, early childhood teachers exhibited higher identification ability than the physical education teachers. The intervention program significantly enhanced the educators' ability to identify children with DCD. The implication of this study is that the education of school professionals should be a continuous process. 相似文献