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Extending the decision-making process during yellow phase from human drivers to autonomous vehicles:A microsimulation study with safety considerations

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第2期11卷 362-379页

作者： Efthymis Papadopoulos anastasia nikolaidou Emmanouil Lilis Ioannis Politis Panagiotis Papaioannou Transport Engineering Laboratory School of Civil EngineeringFaculty of EngineeringAristotle University of ThessalonikiThessaloniki 54124Greece

One of the main factors affecting the safety of signalised intersections is the stop/go behaviour during the yellow *** previous research has exhaustively examined drivers’stop/go decision-making,the expected autonomous vehicles’(AVs’)stop/go behaviour has not yet been thoroughly *** a series of simulation experiments developed for conventional and autonomous vehicles using different carfollowing,lane-changing,lateral placement and stop/go model parameter values,we examine here whether the default VISSIM stop/go parameter values can adequately replicate the observed drivers’behaviour at the considered intersection and assess the suitability of using the currently available options,albeit referring to human drivers,to simulate the expected stop/go behaviour of *** also propose a policy framework for determining the desired behaviour of AVs in yellow interval,which is integrated into an AVs logic and achieved in the last simulation to explore the effect of automation on the stop/go outcome and,hence,on the safety level of signalised *** data analysis and modeling techniques were used for the formulation of certain scenarios,including binary choice *** default stop/go parameter values were found unfit to replicate the observed stop/go behaviour and subjected to *** to the currently available options,the proposed AVs logic proved to produce the most accurate results,in terms of the stop/go simulation *** the impact of automation on the stop/go outcome,the simulation experiments showed that AVs preferred a more conservative behaviour in favor of road safety,as indicated by the significant reduction(≈15%)in the number of vehicles crossing the stop line during the yellow light and zero instances of red light ***,compared to the conservative drivers represented by the default stop/go parameter values,AVs preferred a more rational behaviour in favor of intersection capacit

关键词： Driver behaviour AVs behaviour Signalised intersection Choice model Micro-simulation Policy framework

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Modeling neutral-atmospheric electromagnetic delays in a“big data”world

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Geo-Spatial Information Science 2018年第2期21卷 75-79页

作者： Marcelo C.Santos Thalia nikolaidou Department of Geodesy and Geomatics Engineering University of New BrunswickFrederictonCanada

If left unmodeled,the delay suffered by electromagnetic waves while crossing the neutral atmosphere negatively affects Global Navigation Satellite System *** modeling of the delay has been carried out by means of empirical models formulated based on climatological information or using information extracted from numerical weather prediction(NWP)*** paper explores the potential use of meteorological information of several types that will become available with the increasing number of sensors(e.g.a cell phone,or the thermometer of a nearby smart home)in *** can we make use of these potentially huge datasets,which may help to provide the best possible representation of the neutral atmosphere at any given time,as readily and as accurately as possible?This situation falls in the realm of Big Data.A few potential scenarios,a sequential improvement of Marini mapping function coefficients,a self-feeding NWP,and near real-time empirical model updates,are discussed in this *** pros and cons of each approach are discussed in comparison with what is done *** indicate that they have potential for a positive contribution.

关键词： Global navigation satellite system(GNSS) big data neutral atmosphere

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Effect of panel reactive antibodies on T cell immunity reinstatement following renal transplantation

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World Journal of Transplantation 2022年第10期12卷 313-324页

作者： Lampros Vagiotas Maria Stangou Efstratios Kasimatis Aliki Xochelli Grigorios Myserlis Georgios Lioulios Vasiliki nikolaidou Manolis Panteli Konstantinos Ouranos Nikolaos Antoniadis Daoudaki Maria Aikaterini Papagianni Georgios Tsoulfas Asimina Fylaktou Department of Transplant Surgery School of MedicineAristotle University of ThessalonikiHippokration General HospitalThessaloniki 54642Greece Department of Nephrology School of MedicineAristotle University of ThessalonikiHippokration General HospitalThessaloniki 54642Greece Department of Immunology National Peripheral Histocompatibility CenterHippokration General HospitalThessaloniki 54642Greece Medical School Aristotle University of Thessaloniki Biochemistry LaboratorySchool of MedicineAristotle University of ThessalonikiThessaloniki 54124Greece

BACKGROUND Chronic kidney disease is associated with immunological disorders,presented as phenotypic alterations of T *** changes are expected to be restored after a successful renal transplantation;however,additional parameters may contribute to this *** To evaluate the impact of positive panel reactive antibodies(PRAs)on the restoration of T cell phenotype,after renal *** CD4CD28null,CD8CD28null,natural killer cells(NKs),and regulatory T cells(Tregs)were estimated by flow cytometry at T0,T3,and T6 which were the time of transplantation,and 3-and 6-mo follow-up,*** were estimated regarding the presence or absence of *** Patients were classified in two groups:PRA(-)(n=43)and PRA(+)(n=28)*** and their subtypes were similar between the two groups at T0,whereas their percentage was increased at T3 in PRA(-)compared to PRA(+)[23(10.9-47.9)vs 16.4(7.5-36.8)μ/L,respectively;P=0.03].Lymphocyte changes in PRA(-)patients included a significant increase in CD4 cells(P<0.0001),CD8 cells(P<0.0001),and Tregs(P<0.0001),and a reduction of NKs(P<0.0001).PRA(+)patients showed an increase in CD4(P=0.008)and CD8(P=0.0001),and a reduction in NKs(P=0.07).CD4CD28null and CD8CD28null cells,although initially reduced in both groups,were stabilized *** Our study described important differences in the immune response between PRA(+)and PRA(-)patients with changes in lymphocytes and lymphocyte ***(+)patients seemed to have a worse immune profile after 6 mo follow-up,regardless of renal function.

关键词： Chronic kidney disease Panel reactive antibodies Lymphocyte subpopulation CD4CD28null cells CD8CD28null cells

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Hematopoietic stem cells from peripheral blood the perspective of non-mobilized peripheral blood

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Health 2010年第6期2卷 519-527页

作者： Vassilios Katsares Zissis Paparidis Eleni nikolaidou anastasia Petsa Iliana Karvounidou Karina-Alina Ardelean Nikolaos Peroulis Nikolaos Grigoriadis John Grigoriadis 不详

The peripheral blood is a major source of hematopoietic stem cells. Almost for two decades the peripheral blood has been mobilized, in order to enhance the CD34+ concentration. The isolated stem cells from the mobilized peripheral blood are used as an alternative, or in addition to bone marrow derived stem cells. In this paper, a new perspective is being discussed;the use of non-mobilized peripheral blood as an alternative source for hematopoietic progenitor cells. The number of isolated hematopoietic stem cells is evaluated using flow cytometry. The viability can be evaluated using the trypan blue exclusion test, the flow cytometry or automated assays. The isolated hematopoietic stem cells could be used for ex vivo expansion either in static systems or in proper bioreactor systems, prior to cryopreservation and/or transplantation.

关键词： Non-Mobilized Peripheral Blood Hematopoietic Stem Cells Ex Vivo Expansion

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Typology of Motivation and Aggression on the Basis of Social Network Variables: Examples of Complementary and Nested Behavioral Types through Conventional Statistics

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Social Networking 2017年第2期6卷 135-147页

作者： Alexandra Bekiari Zoi Anna nikolaidou Nikolaos Hasanagas Faculty of Physical Education and Sports Sciences University of Thessaly Trikala Greece

Goal of this research is to suggest a typology of verbal aggressiveness, argumentativeness and motivational climate influence, pointing out examples of complementary types (namely containing no identical components) and nested types (containing identical components). Complete network analysis was conducted in a student class at the Dept. of Physical Education and Sport Sciences, University of Thessaly (N = 66). Standardized questionnaires were used. Network analysis and Principal Component Analysis were implemented using Visone software and SPSS, respectively. Main results were: in the typology of targeting, parameters of motivation climate, verbal aggressiveness and argumentativeness were combined in several types (“affable ambitious”, “isolated victim”, “isolated ambitious”, “lightly victimized” and “severely victimized”) which were partially complementary and partially nested into each other. These depict student profiles vary from quite socialized and invulnerable to only isolated and victimized. They also reveal the significance of seeking knowledge acquirement vs. performance. The typology of general involvement (in- and out-degree) contains types tending to be rather nested into each other than complementary which varies from quite integrative to purely deconstructive appearance. This typology depicts the connection of motivation climate (and the subsequently induced familiarity) with verbal aggressiveness without diminishing susceptibility to argumentation. The fact that the typology of targeting is composed of several complementary types while in the typology of general involvement mainly of nested ones, can be attributed to the structural clarity of the former ones (a typology focusing

关键词： Verbal Aggressiveness Argumentativeness Motivation Complementary and Nested Types

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