A multimodal dataset for authoring and editing multimedia content:the MAMEM project

We present a dataset that combines multimodal biosignals and eye tracking information gathered under a human-computer interaction framework. The dataset was developed in the vein of the MAMEM project that aims to endow people with motor disabilities with the ability to edit and author multimedia content through mental commands and gaze activity. The dataset includes EEG, eye-tracking, and physiological (GSR and Heart rate) signals collected from 34 individuals (18 able-bodied and 16 motor-impaired). Data were collected during the interaction with specifically designed interface for web browsing and multimedia content manipulation and during imaginary movement tasks. The presented dataset will contribute towards the development and evaluation of modern human-computer interaction systems that would foster the integration of people with severe motor impairments back into society.</p

Optimal two treatment repeated measurement designs for three periods

Repeated Measurement Designs, with two treatments, n (experimental) units and p periods are examined, the two treatments are denoted A and B. The model with independent observations within and between treatment sequences is used. Optimal designs are derived for: (i) the difference of direct treatment effects and the difference of residual effects, (ii) the difference of direct treatment effects, and (iii) the difference of residual effects. We prove that for three periods when n is odd the optimal design in the three cases (i), (ii), and (iii) is determined by taking the sequences BAA and ABB in numbers differing by one. If n is even, the optimal design in cases (i), (ii), and (iii) is again the same, by taking the sequences ABB and BAA in equal numbers. In case (i), for n even or odd, in the optimal design there is no correlation between the two estimated parameters. For n even, case (i) was solved by Cheng and Wu in 1980. The above imply that with two treatments in practice are preferable to use three periods instead of two. © 2017 Taylor &amp; Francis Group, LLC

Estimability of parameters in a linear model and related characterizations

An alternative criterion is presented for a linear function of the unknown parameters, in a linear model, to be estimable. If there is a linear relationship between members of a subset of the columns of the design matrix X, then the parameters associated with all the columns in that subset are not estimable. Also any part of their linear relationship is non-estimable. © 2008 Elsevier B.V. All rights reserved

On reliability structures with two common failure criteria under age-based maintenance policy

In this work we study reliability structures with two common failure criteria under specific age-based preventive maintenance models. The aforementioned systems, which consist of n independent components, fail upon the occurrence of two different scenarios. The theoretical framework for delivering the expected cost rate of such structures is presented in detail, while a variety of numerical outcomes for different choices of the design parameters are also provided and discussed. © 2021 Reliability: Theory and Applications. All rights reserved

Extension and necessity of Cheng and Wu conditions

Repeated Measurement Designs, with two treatments, n (experimental) units and p periods are examined. The model examined is with uncorrelated observations following a continuous distribution with constant variance and the parameters of interest are (i) the difference of direct effects and (ii) the difference of residual effects. In this paper (a) the difference of Universal optimality and Φ-optimality is clarified and (b) the sufficient conditions of Cheng and Wu (1980) are extended to include the case n=2. mod. 4, p even, (c) also it is shown that these conditions are also necessary for Φ-optimality for estimating direct as well as residual effects, and (d) a method is proposed to construct Φ-optimal designs and examples are given when n even and p=3, n=0. mod. 4 and p=4, n=2. mod. 4 and p=4. In the last case the estimated parameters in the optimal design are correlated. © 2012 Elsevier B.V

FACTORS AFFECTING THE FOREST PLANTATIONS ESTABLISHMENT IN THE FRAME OF THE COMMON AGRICULTURAL POLICY

The enactment of measures concerning the afforestation of agricultural land (Regulation (EC) No 2080/92) was part of the accompanying measures for the CAP reform of 1992. Regulation (EC) No 2080/92 provided the opportunity for a significant number of agricultural areas to be withdrawn from food production and to be used for the wood production. The evaluation research for the implementation of Regulation (EC) No 2080/92 took place in the prefecture of Pella, Northem Greece. Data was collected with a questionnaire and analysed using logistic and multinomial logistic regression statistical models. The main conclusions of this paper are that the factors and characteristics which differ in relation to the type of forest plantation selected are the following: age, sex, seminar attendance, proximity of forest plantations to a community forest and the size of the forest plantation

Maximising Accuracy and Efficiency of Traffic Accident Prediction Combining Information Mining with Computational Intelligence Approaches and Decision Trees

The development of universal methodologies for the accurate, efficient, and timely prediction of traffic accident location and severity constitutes a crucial endeavour. In this piece of research, the best combinations of salient accident-related parameters and accurate accident severity prediction models are determined for the 2005 accident dataset brought together by the Republic of Cyprus Police. The optimal methodology involves: (a) information mining in the form of feature selection of the accident parameters that maximise prediction accuracy (implemented via scatter search), followed by feature extraction (implemented via principal component analysis) and selection of the minimal number of components that contain the salient information of the original parameters, which combined bring about an overall 74.42% reduction in the dataset dimensionality; (b) accident severity prediction via probabilistic neural networks and random forests, both of which independently accomplish over 96% correct prediction and a balanced proportion of under- and over-estimations of accident severity. An explanation of the superiority of the optimal combinations of parameters and models is given, as is a comparison with existing accident classification/prediction approaches

Stocks' data mathematical modeling using differential equations: The case of healthcare companies in athens stock exchange

Stock prices' prediction is fundamental for investment decision-making. In this research, a differential equations model is developed for stock prices prediction. More specifically, a 7×7 differential equations system based on Lanchester's combat models will be used. Data concerning the short-term stock's prices of healthcare firms listed in Athens Stock Exchange will be analyzed in order to develop and evaluate the stocks' prices predictive model. The obtained results revealed the differential equations model potential for stock prices' prediction in the short-term. © 2021 Gnedenko Forum. All Rights Reserved

Sertoli cell proliferation in the fetal and neonatal rat testis: A continuous phenomenon?

Sertoli cell population kinetics, as evidenced by semi-quantitative immunolabeling for proliferating cell nuclear antigen (PCNA) and Ki-67, in developing Wistar rat male gonads of embryos and neonates [14.5 days post conception (dpc) - 7 days post partum (dpp)], was investigated. Throughout the examined period a gradual increase of immunolabeled Sertoli cell number, associated with intense mitotic activity, was observed. PCNA labeling index of Sertoli cells increased from 66.67 (at 14.5 dpc) to 89.74 (at 18.5 dpc) and then dropped to 75.24 (at 20.5 dpc). At birth, the percentage of PCNA immunoreactive Sertoli cells reached 98.70% and remained high thereafter, attaining a peak value of 99.90% at 7 dpp. The percentage of Ki-67 immunoreactive Sertoli cells in the fetal testis increased from E14.5 (43.95%) to E20.5 (77.40%). The proliferation rate did not alter considerably in the neonatal testis until 5 dpp. At this point, a significant increase of the Ki-67 labeling index was observed and a peak value of 95.76% was reached at 7 dpp. The pattern of Sertoli cell proliferation with age and the establishment of the final Sertoli cell number in vivo established in the present study was compared to the results from earlier investigations reported in the literature and the observed fluctuation of dividing cell numbers, associated with immunolabeling results throughout the examined period, complements and extends existing data. An appraisal of the timing of Sertoli cell proliferation in other species, namely mouse and man, is presented. The current investigation may be useful in evaluating the potential influence of factors interfering with normal mitotic activity of Sertoli cells, including cell selection mechanisms, such as apoptosis, senescence, DNA repair and hormonal/paracrine growth modulation. © 2007 Elsevier GmbH. All rights reserved