Yannis Alamanos, N. Tsifetaki, P. V. Voulgari, Chrysostomos Siozos, Kyriaki Tsamandouraki, George Α. Alexiou, Alexandros A. Drosos,
To investigate the incidence and prevalence, as well as the mortality and survival rates, of systemic sclerosis (SSc) in a defined area of northwest Greece with a population of about 500,000 inhabitants. Cases have been recorded from the following sources: (1) inpatients and outpatients referred to the Rheumatology Clinics of the Ioannina University Hospital and the Ioannina General Hospital; (2) patients referred to the private rheumatologists practicing in the study area. All patients recorded between ...
Tópico(s): Dermatologic Treatments and Research
2005 - Elsevier BV | Seminars in Arthritis and Rheumatism
Panagiotis Kokkalis, Dimitrios Alexiou, Alexandros Papayannis, Francesc Rocadenbosch, Ουρανία Σουπιωνά, Ioannis-Panagiotis Raptis, Maria Mylonaki, Chris G. Tzanis, John Christodoulakis,
We investigate the temporal evolution of the planetary boundary-layer (PBL) height over the basin of Athens, Greece, during a 6-year period (2011–2016), using data from a Raman lidar system. The range-corrected lidar signals are selected around local noon (1200 UTC) and midnight (0000 UTC), for a total of 332 cases: 165 days and 167 nights. In this dataset, the extended-Kalman filtering technique is applied and tested for the determination of the PBL height. Several well-established techniques for the ...
Tópico(s): Atmospheric and Environmental Gas Dynamics
2020 - Springer Science+Business Media | Boundary-Layer Meteorology
Guanpeng Dong, Levi John Wolf, Alexandros Alexiou, Daniel Arribas‐Bel,
Social and physical processes often exhibit both macro-level geographic smoothness – implying positive spatial dependence – and micro-level discontinuities – suggesting implicit step changes or boundaries in the data. However, a simultaneous treatment of the two features in a unified statistical model poses great challenges. This study extends an innovative locally adaptive spatial auto-regressive modelling approach to a multi-level modelling framework in order to explore multiple-scale geographical data. ...
Tópico(s): Housing Market and Economics
2018 - Elsevier BV | Computers Environment and Urban Systems
Alex Singleton, Alexandros Alexiou, Rahul Savani,
Geographic variation in digital inequality manifests as a result of a range of demographic, attitudinal, behavioural and locational factors. To better understand this multidimensional geography, our paper develops a new geodemographic classification for the spatial extent of Great Britain. In this model, we integrate a range of new small area measures that are drawn from multiple new forms of data including consumer purchasing data, survey and open data sources. Our analytical approach innovatively ...
Tópico(s): Health disparities and outcomes
2020 - Elsevier BV | Computers Environment and Urban Systems
Davara Bennett, Kate Mason, Daniela K. Schlüter, Sophie Wickham, Eric T C Lai, Alexandros Alexiou, Ben Barr, David Taylor‐Robinson,
To assess trends in inequalities in Children Looked After (CLA) in England between 2004 and 2019, after controlling for unemployment, a marker of recession and risk factor for child maltreatment.Longitudinal local area ecological analysis.150 English upper-tier local authorities.Children under the age of 18 years.The annual age-standardised rate of children starting to be looked after (CLA rate) across English local authorities, grouped into quintiles based on their level of income deprivation. Slope ...
Tópico(s): Child Abuse and Trauma
2020 - BMJ | BMJ Open
Konstantinos Daras, Alexandros Alexiou, Tanith C. Rose, Iain Buchan, David Taylor‐Robinson, Ben Barr,
Background: During the initial wave of the COVID-19 epidemic in England, several population characteristics were associated with increased risk of mortality - including, age, ethnicity, income deprivation, care home residence and housing conditions. In order to target control measures and plan for future waves of the epidemic, public health agencies need to understand how these vulnerabilities are distributed across and clustered within communities. We therefore generated an empirically informed vulnerability ...
Tópico(s): Employment and Welfare Studies
2020 - RELX Group (Netherlands) | SSRN Electronic Journal
Alexandros Alexiou, Kate Mason, Katie Fahy, David Taylor‐Robinson, Ben Barr,
Since 2010 there have been large reductions in funding for local government services in England. This has led to reduced income to fund services, such as housing services, that potentially promote health. Housing services expenditure includes spending on housing advice services, homelessness relief and provision of temporary accommodation. During the same period there has been an increase in homelessness and drug related mortality. We carried out an ecological study by linking data on housing services ...
Tópico(s): Employment and Welfare Studies
2021 - Taylor & Francis | International Journal of Housing Policy
Alexandros Alexiou, Katie Fahy, Kate Mason, Davara Bennett, Heather Brown, Clare Bambra, David Taylor‐Robinson, Ben Barr,
Since 2010, large reductions in funding for local government services have been introduced in England. These reductions in funding have potentially led to reduced provision of health-promoting public services. We aimed to investigate whether areas that showed a greater decline in funding also had more adverse trends in life expectancy and premature mortality.In this longitudinal ecological study, we linked annual data from the Ministry of Housing, Communities, and Local Government on local government ...
Tópico(s): Housing, Finance, and Neoliberalism
2021 - Elsevier BV | The Lancet Public Health
Kate Mason, Alexandros Alexiou, Davara Bennett, Carolyn Summerbell, Ben Barr, David Taylor‐Robinson,
Childhood obesity is rising in disadvantaged areas in England. Sure Start children's centres provide community-based services for children <5 years and their parents, including many services that can support healthy weight, directly or indirectly. Since 2010, austerity-driven cuts to local authority (LA) budgets have led to substantially reduced public expenditure on Sure Start services. We assessed whether childhood obesity prevalence has increased more since 2010 in those areas in England that experienced ...
Tópico(s): Child and Adolescent Health
2021 - BMJ | Journal of Epidemiology & Community Health
Konstantinos Daras, Alexandros Alexiou, Tanith C. Rose, Iain Buchan, David Taylor‐Robinson, Ben Barr,
During the initial wave of the COVID-19 epidemic in England, several population characteristics were associated with increased risk of mortality-including, age, ethnicity, income deprivation, care home residence and housing conditions. In order to target control measures and plan for future waves of the epidemic, public health agencies need to understand how these vulnerabilities are distributed across and clustered within communities.
Tópico(s): Migration, Health and Trauma
2021 - BMJ | Journal of Epidemiology & Community Health
Davara Bennett, Daniela K. Schlüter, Gabriella Melis, Paul Bywaters, Alexandros Alexiou, Ben Barr, Sophie Wickham, David Taylor‐Robinson,
BackgroundChildren in care face adverse health outcomes throughout their life course compared with their peers. In England, over the past decade, the stark rise in the number of cared-for children has coincided with rising child poverty, a key risk factor for children entering care. We aimed to assess the contribution of recent trends in child poverty to trends in care entry.MethodsIn this longitudinal, ecological study of 147 local authorities in England, we linked data from the Department for ...
Tópico(s): Children's Rights and Participation
2022 - Elsevier BV | The Lancet Public Health
Alexandros Alexiou, Alex Singleton, Paul Longley,
Identifying socio-spatial pa erns through geodemographic classification has provenutility over a range of disciplines. While most of these spatial classification systems include a plethora of socioeconomic attributes, there is arguably little to no input regarding attributes of the built environment or physical space, and their relationship to socioeconomic profiles within this context has not been evaluated in any systematic way. This research explores the generation of neighbourhood characteristics ...
Tópico(s): Land Use and Ecosystem Services
2016 - Alexandrine Press | Built Environment
Anestis Karkanis, Alexandros Alexiou, Christos Katsaros, Spyridon Α. Petropoulos,
The inclusion of species with allelopathic activity in crop rotation systems may have benefits for crop management such as weed control, but less is understood about their wider impacts on succeeding crops. The main objective of this study was to investigate the effects of two allelopathic species (spearmint and peppermint) on growth, physiological characteristics, and yield of a following maize crop. Thus, field experiments were carried out at two sites, according to a randomized complete block ...
Tópico(s): Agronomic Practices and Intercropping Systems
2019 - Multidisciplinary Digital Publishing Institute | Agronomy
Davara Bennett, Calum Webb, Kate Mason, Daniela K. Schlüter, Katie Fahy, Alexandros Alexiou, Sophie Wickham, Ben Barr, David Taylor‐Robinson,
Children in care face adverse health outcomes, throughout the life-course, relative to the general population. In England, over the last decade, the rate of children entering care has increased. The rate of change differs markedly for older and younger children, who may also experience different preventative services. These services have been subject to inequitable spending reductions due to fiscal policies trailing the 2008 recession. To assess the impact of cuts to prevention on rates of preschool ...
Tópico(s): Early Childhood Education and Development
2021 - Elsevier BV | Children and Youth Services Review
Ourania Nicolatou‐Galitis, Erofili Papadopoulou, Emmanouil Vardas, Maria Kouri, Dimitra Galiti, Evangelos Galitis, Konstantina Alexiou, Kostas Tsiklakis, Alexandros Ardavanis, Evangelia Razis, Ilias Athanasiadis, Stavroula Droufakou, Amanda Psyrri, Michalis V. Karamouzis, Helena Linardou, Danai Daliani, D. Tzanninis, Sotirios Sachanas, Konstantinos Laschos, Marie‐Christine Kyrtsonis, Fotini Antoniou, Apostolos Laskarakis, Styllianos Giassas, Adamantia Nikolaidi, George S. Rigakos, Anna Ntokou, César A. Migliorati, Carla Ripamonti,
We reported the alveolar bone histology prior to dental extractions in cancer patients, who received bone-targeting agents (BTA).Fifty-four patients were included. Patients underwent extractions, and bone biopsies were taken.Extractions were performed due to pain, swelling, purulence, fistula, and numbness, not responding to treatment, in 40 patients (group A); extractions due to asymptomatic, non-restorable teeth, were performed in 14 patients (group B). Complete alveolar jaw bone histological necrosis ...
Tópico(s): Bone and Joint Diseases
2020 - Wiley | Oral Diseases
Kate Mason, Alexandros Alexiou, Ben Barr, David Taylor‐Robinson,
Almost 20% of children in England are living with obesity by the end of primary school, with marked and growing inequalities driven by increasing prevalence in more deprived areas. Neighbourhood environments are upstream determinants of childhood weight status. Cultural, Environmental and Planning (CEP) services delivered by local authorities (LAs) in England include various services that contribute to these local environments, e.g. leisure centres, parks, playgrounds, libraries, community safety ...
Tópico(s): Obesity and Health Practices
2023 - Elsevier BV | Health & Place
Katie Fahy, Alexandros Alexiou, Kate Mason, Davara Bennett, Matt Egan, David Taylor‐Robinson, Ben Barr,
Abstract Background Local government provides Cultural, Environmental, and Planning (CEP) services, such as parks, libraries, and waste collection, that are vital for promoting health and wellbeing. There have been significant changes to the funding of these services over the past decade, most notably due to the UK government’s austerity programme. These changes have not affected all places equally. To understand potential impacts on health inequalities, we investigated geographical patterning of ...
Tópico(s): Health disparities and outcomes
2023 - BioMed Central | BMC Public Health
... term and longer term. A new analysis by Alexandros Alexiou and colleagues8Alexiou A Fahy K Mason K et ...
Tópico(s): Employment and Welfare Studies
2021 - Elsevier BV | The Lancet Public Health
Alexandros–Apostolos A. Boulogeorgos, Angeliki Alexiou, Thomas Merkle, Colja Schubert, Robert Elschner, Alexandros Katsiotis, Panagiotis Stavrianos, Dimitrios Kritharidis, Panteleimon-Konstantinos Chartsias, Joonas Kokkoniemi, Markku Juntti, Janne Lehtomäki, A. Teixeira, Francisco Rodrigues,
This article discusses the basic system architecture for THz wireless links with bandwidths of more than 50 GHz into optical networks. New design principles and breakthrough technologies are required in order to demonstrate terabit- per-second data rates at near zero latency using the proposed system concept. Specifically, we present the concept of designing the baseband signal processing for both the optical and wireless links and using an E2E error correction approach for the combined link. We ...
Tópico(s): Photonic and Optical Devices
2018 - Institute of Electrical and Electronics Engineers | IEEE Communications Magazine
Kate Mason, Alexandros Alexiou, Ang Li, David Taylor‐Robinson,
Housing insecurity is an escalating problem in the UK but there is limited evidence about its health impacts. Using nationally representative panel data and causally focussed methods, we examined the effect of insecure housing on mental health, sleep and blood pressure, during a period of government austerity.
Tópico(s): Health disparities and outcomes
2024 - Elsevier BV | Social Science & Medicine
Dimitrios Alexiou, Panagiotis Kokkalis, Alexandros Papayannis, Francesc Rocadenbosch, Athina Argyrouli, G. Tsaknakis, Chris G. Tzanis,
In this paper we studied the temporal evolution of the Planetary Boundary Layer height (PBLH) over the basin of Athens, Greece during a 5-year period (2011-2016) using data from the EOLE Raman lidar system. The lidar data (range-corrected lidar signals-RCS) were selected around 12:00 UTC and 00:00 UTC for a total of 332 cases: 165 days and 167 nights. Extended Kalman filtering techniques were used for the determination of the PBLH. Moreover, several well established techniques for the PBLH estimation ...
Tópico(s): Aeolian processes and effects
2018 - EDP Sciences | EPJ Web of Conferences
Stamatina Th. Rassia, Alexandros Alexiou, Nick Baker,
Tópico(s): Building Energy and Comfort Optimization
2010 - Springer Science+Business Media | Energy Systems
Lykourgos Alexiou, Amit Goyal, Alexandros Kostakis, Leonidas Rompolis,
We document that implied volatility (IV) curves extracted from short-term equity options frequently become concave prior to the earnings announcement day (EAD) reflecting a bimodal risk-neutral distribution for the underlying stock price. Firms with concave IV curves exhibit significantly higher absolute stock returns on EAD and higher realized volatility after the announcement, as compared to firms with non-concave IV curves. Hence, concavity in the IV curve constitutes an ex-ante option-based signal ...
Tópico(s): Financial Risk and Volatility Modeling
2021 - RELX Group (Netherlands) | SSRN Electronic Journal
Alexandros–Apostolos A. Boulogeorgos, Angeliki Alexiou,
In this letter, we introduce a novel mixed terahertz (THz)-radio frequency (RF) wireless system architecture, which can be used for backhaul/fronthaul applications, and we deliver the theoretical framework for its performance assessment. In more detail, after identifying the main design parameters and characteristics, we derive novel closed-form expressions for the end-to-end signal-to-noise ratio cumulative density function, the outage probability and the symbol error rate, assuming that the system ...
Tópico(s): Energy Harvesting in Wireless Networks
2019 - IEEE Communications Society | IEEE Communications Letters
Alexandros–Apostolos A. Boulogeorgos, Angeliki Alexiou,
In the present work, we investigate the impact of transceiver hardware imperfection on reconfigurable intelligent surface (RIS)-assisted wireless systems. In this direction, first, we present a general model that accommodates the impact of the transmitter (TX) and receiver (RX) radio frequency impairments. Next, we derive novel closed-form expressions for the instantaneous end-to-end signal-to-noise-plus-distortion-ratio (SNDR). Building upon these expressions, we extract an exact closed-form expression ...
Tópico(s): IoT Networks and Protocols
2020 - IEEE Communications Society | IEEE Open Journal of the Communications Society
Evangelos N. Papasotiriou, Alexandros–Apostolos A. Boulogeorgos, Angeliki Alexiou,
This work aims to present the theoretical framework for the outage performance assessment of the joint impact of antenna misalignment and local oscillator (LO) phase noise (PHN) on terahertz (THz) wireless systems. In more detail, a closed form expression for the outage probability and a tight high signal to noise ratio (SNR) approximation were extracted. Our results reveal the detrimental impact of antenna misalignment and PHN and the importance of taking them into consideration when analyzing the ...
Tópico(s): Microwave Engineering and Waveguides
2020 - IEEE Communications Society | IEEE Communications Letters
Alexandros–Apostolos A. Boulogeorgos, Angeliki Alexiou,
In this paper, we provide the theoretical framework for the performance comparison of reconfigurable intelligent surfaces (RISs) and amplify-and-forward (AF) relaying wireless systems. In particular, after statistically characterizing the end-to-end (e2e) wireless channel coefficient of the RIS-assisted wireless system, in terms of probability density function (PDF) and cumulative density function (CDF), we extract novel closed-form expressions for the instantaneous and average e2e signal-to-noise ratio ( ...
Tópico(s): Antenna Design and Analysis
2020 - Institute of Electrical and Electronics Engineers | IEEE Access
Alexandros–Apostolos A. Boulogeorgos, Angeliki Alexiou,
This paper presents a connectivity analysis of reconfigurable intelligent surface (RIS) assisted terahertz (THz) wireless systems. Specifically, a system model that accommodates the particularities of THz band links as well as the characteristics of the RIS is reported, accompanied by a novel general end-to-end (e2e) channel attenuation formula. Based on this formula, we derive a closed-form expression that returns the optimal phase shifting of each reflection unit (RU) of the RIS. Moreover, we provide ...
Tópico(s): Millimeter-Wave Propagation and Modeling
2021 - Institute of Electrical and Electronics Engineers | IEEE Open Journal of Vehicular Technology
Alexandros–Apostolos A. Boulogeorgos, Angeliki Alexiou, Marco Di Renzo,
In this paper, we analyze the performance of a reconfigurable intelligent surface (RIS)-assisted unmanned aerial vehicle (UAV) wireless system that is affected by mixture-gamma small-scale fading, stochastic disorientation and misalignment, as well as transceivers hardware imperfections. First, we statistically characterize the end-to-end channel for both cases, i.e., in the absence as well as in the presence of disorientation and misalignment, by extracting closed-form formulas for the probability ...
Tópico(s): Antenna Design and Analysis
2022 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Vehicular Technology
Ioannis Mouzakitis, Zoi Kleinaki, Theodora Petropoulou, Erato Alexiou, Alexandros Stefanidis,
The coronavirus disease 2019 (COVID-19) pandemic has radically altered priorities and planning in the global medical community with continuously increasing numbers of infected patients. Cardiovascular disease accounts for the most common comorbidity encountered in patients with COVID-19. Infective endocarditis (IE) represents a grave medical condition as it may compromise circulatory homeostasis, renal function, and lead to embolic complications. COVID-19 also causes coagulopathy-associated complications. ...
Tópico(s): Streptococcal Infections and Treatments
2021 - Cureus, Inc. | Cureus