
Spyridon K ChronopoulosUniversity of Ioannina | UOI · Department of Physics
Spyridon K Chronopoulos
Doctor of Philosophy
Adjunct Assistant Professor
About
140
Publications
29,912
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Introduction
Dr. S. K. Chronopoulos was born in Athens, Greece. He received a BSc in Physics, an MSc in "Modern Electronic Technologies" and his PhD in "Telecommunications Applications" from UOI, Greece. His interests include D&D of Wireless & Embedded Systems related to OFDM, Turbo Codes, Antenna Design, Satellite Links, Measuring Technology, Mathematical Analysis & Modelling, and Interdisciplinarity. His most insightful works include more than 40 Journals, 8 Book Chapters, and 1 Monograph (Journal).
Additional affiliations
November 2021 - September 2023
February 2021 - September 2021
October 2018 - September 2019
Education
June 2014 - June 2014
September 2011 - September 2011
Epirus Region, Division of Transportation and Communications (Greece)
Field of study
- Telecommunications
October 2006 - October 2006
Publications
Publications (140)
A telecommunication system uses carriers in order to transmit information through a cable or wirelessly. If each time only one carrier is transmitted, then the system’s signal will not be immune to frequency selective fading. If frequency selective fading includes the working frequency of the system, then the wireless link will not be established....
For this Special Issue of Sensors, we hope to present works (research papers and reviews) that focus on the dual public and military application of the same, or at least similar, hardware. Especially, works focusing on green technology combining public and military aspects are welcomed, as are works on any kind of unmanned vehicles based on the afo...
Long Range (LoRa) systems have recently attracted significant attention within the research community as well as for commercial use due to their ability to transmit data over long distances at a relatively low energy cost. In this study, new results for the bit error rate performance of Long Range (LoRa) systems operating in the presence of Rayleig...
For this Special Issue of Sensors, the main goal is to approach the solutions procedures with a different point of view by emphasizing the essential idea while expressing it in simple words to enhance the endeavors of various scientific teams. The new proposed techniques must be easily implementable because they refer to a pluralism of phenomena an...
In the modern technological era of sophisticated applications and high-quality communications, a platform of clever strategy and quickly updated systems is needed. It should be capable of withstanding the fastest emerging problems like signal attenuation and hostile actions intended to harm the whole network. The main contributions of this work are...
The urgent need for timely and accurate precipitation estimations in the face of ongoing climate change and the increasing frequency and/or intensity of extreme weather events underscores the necessity for innovative approaches. Recently, several studies have focused on estimating the precipitation rate through induced attenuation of radio frequenc...
We analyzed a large number (77) of low-to-medium-magnitude earthquakes (M3.5–M6.5) that occurred within a period of three years (2020–2022) in the Southern half of Greece in relation to the ELF activity in that region and time period. In most cases, characteristic ELF signals appear up to 20 days before the earthquakes. This observation may add an...
In light of recent extreme weather events, it is imperative to explore innovative methodologies for promptly and accurately measuring various meteorological parameters. The high spatial and temporal variability in precipitation often surpasses the resolution capabilities of traditional rain gauge measurements and satellite estimation algorithms. Th...
This paper presents a compact multifrequency reconfigurable patch antenna in terms of design and fabrication for operating in the S and C bands of the RF spectrum, which are overwhelmed by wireless applications. Reconfiguration is achieved by using a single PIN diode on the ground plane. By varying the voltage applied to the diode, three modes can...
This Special Issue aims to gather researchers from different scientific areas to highlight new and future trends in this interdisciplinary field. This particular issue highlights works that propose new or improved traditional or opportunistic sensing methods, in situ and remote rainfall devices, methodologies, and algorithms. Challenges to be cover...
The purpose of this paper is to mention the overall scientific needs and provocation of the Quantum Theory, but also the stages that led to its formation (whereas there is rich literature). Moreover, we demonstrate and innovate toward providing the basic principles aiming to give meaning and context to what the title of this work includes, and that...
In this paper, a preliminary implementation of a system monitoring the fetus’s heart rate (FHR) has been designed and implemented as a mobile wearable measuring system with remote sensing specifically developed on Node MCU ESP8266 (ESP). In particular, the proposed system uses sensors for heart rate, humidity, temperature, and a transceiver module....
Artificial Intelligence and machine learning become more and more crucial for participating in the role of digital entities in various projects. One of these projects could be the resonance disorders and nasality problems as terms referring to a problem that can be recognized during speech production in both children and adults. The previous condit...
The modern era of advanced communications and electronic structures yields with steady steps the enhanced implementation of smart “leadership in energy and environmental design” (LEED) buildings with artificial intelligence (AI) structures. These structures need development through various studied steps. In this paper, we propose a holistic design...
Eye tracking is a promising technology offering objective metrics quantifying visual attention in various application fields. The employment in people with specific learning disabilities (SLDs), who reportedly manifest long-term functional social, emotional, and behavioral difficulties, provided well understandings of their visual attention, detect...
Although a high prevalence of developmental speech/language disorders (3–17%) has been reported in the current literature still many children are underdiagnosed resulting to miss out on effective interventions that could be of more impact if administered early. The utilization of digital and mobile technologies in health and learning has evolved, p...
Voice assessment consists of many methods, amongst them being the Voice Handicap Index (VHI) which is a non-interventional self-reported questionnaire. This research determined and interpreted the cutoff points (COPs) of the Receiver Operating Characteristic (ROC) curves (signal processing) of the standardized VHI Hellenic version along with the Gr...
Background: Currently, there is a vast number of electronic and mobile devices which serve for self-evaluation purposes. Specifically, wearable technology has been vastly developed in the last years in conjunction with the usage of mobile phones’ applications for the convenience of their users. In the context of the aforementioned, a proper segment...
Although a high prevalence of developmental speech/language disorders (3-17%) has been reported in the current literature still many children are underdi-agnosed resulting to miss out on effective interventions that could be of more impact if administered early. The utilization of digital and mobile technologies in health and learning has evolved,...
Background: Currently, there is a vast number of electronic and mobile devices which serve for self-evaluation purposes. Specifically, wearable technology has been vastly developed in the last years in conjunction with the usage of mobile phones' applications for the convenience of their users. In the context of the aforementioned, a proper segment...
Eye tracking is a promising technology offering objective metrics quantifying visual attention in various application fields. The employment in people with specific learning disabilities (SLDs), who reportedly manifest long-term functional social, emotional, and behavioral difficulties, provided well understandings of their visual attention, detect...
Voice assessment consists of many methods, amongst them being the Voice Handicap Index (VHI) which is a non-interventional self-reported questionnaire. This research determined and interpreted the cutoff points (COPs) of the Receiver Operating Characteristic (ROC) curves (signal processing) of the standardized VHI Hellenic version along with the Gr...
Currently, the needs for new technologies are rising and especially due to Covid-19. The world is changing into a digital theater of businesses and educational processes. Consequently, tele-health is constantly enriched with new scientific areas of expertise, a fact that gives a new and promising perspective for people who cannot reach in-time a sp...
Information and Communication Technologies (ICTs) have been utilized in the educational process, enriching and enhancing the traditional teaching methods. The purpose of the current study was to explore the potential of utilizing ICTs as an educational and therapeutic tool in preschool children with speech and language difficulties in the Greek lan...
Currently, hospitals and health care sectors employ low-cost Internet of Things based remote health monitoring systems and labs in order to collect a subject's or patients’ real-time data. Such a process can be helpful for the early detection of a healthy newborn life and of critical importance for the survival of these lives. In this article, a pr...
A dedicated extremely low frequency (ELF) detector has been constructed and used successfully for Schumann Resonance (SRs) measurements in N.W. Greece. The main objective of this work was to investigate the effect of local lightning activity on the recorded signal of our ELF detector and consequently on the estimated SRs parameters, namely the powe...
We analyzed an extended time series of Schumann Resonance recordings with two multi-parametric statistical methods, the generalized linear Logistic Regression—LogReg and the non-linear Random Forest—RF, in order to test their potential for earthquake prediction within a narrow time-space-magnitude window of 48 h, 250 km from our observing site, and...
Very recent work reported that patients can monitor their heartbeat at home and specify their heart conditions by means of a millimetre wave radar, but there exist serious limitations because the radar sensor is sensitive to significant body motions that cause Doppler frequency shifts. Such limitations do not exist when using a recently constructed...
Objective. The inclusion of subjective methods for evaluating Voice Disorders is proven an essential factor for diagnosis as these methods include self-reported questionnaires (eg, Voice Handicap Index-VHI) for everyday clinical practice. In turn, by obtaining cut-off scores of self-perceived questionnaires intended for assessment procedures of dif...
Many works have been conducted relevant to rainfall measurements, while the first relevant ones were based on the power loss estimation function from wireless links located back to the early 1940s. It is notable, though, that this innovative idea conduced to many theoretical models correlating the signal attenuation to the rainfall intensity. This...
Rain monitoring through signal attenuation has been a significant concern for the scientific community over the last decade. The lowest L-, Sand C-bands in the microwave spectrum are full of potential for environmental monitoring devices. It has not been extensively proven whether signal attenuation can be used for rain estimation throughout the mi...
Background/aims:
The number of different words (NDW), an essential measure of lexical diversity, is extremely valuable towards providing data regarding children's language development. However, in Cyprus, practitioners are deprived of the opportunity to utilize NDW, as no normative data exist for toddlers who speak Cypriot Greek (CYG).
Methods:...
Objective(s)
The use of subjective evaluation tools are proven useful and of high clinical value in the case of voice disordered population. For that type of evaluation, self-assessment questionnaires about the severity of the voice like Voice Handicap Index-30 (VHI-30) have been developed. The VHI-30 is the most studied tool which includes psycho...
Two medium-magnitude earthquakes separated by a distance of 230 km occurred within 34 days from each other in Northern Greece. A few hours before the manifestation of seismic activity, significant extra-low-frequency (ELF) perturbations were detected in a nearby Schumann resonance observation site. The typical spectrum of ELF measurements was defor...
Schumann resonances (SRs) provide a unique tool for exploring continuous and long-term monitoring of global environmental parameters, although their detection and study is a very complex task. This paper presents diurnal and seasonal variations of principal parameters, namely the resonance frequency, the Q-factor, and the power of SRs, in the North...
This paper presents a prototype test fixture for the absolute calibration and estimation of the equivalent magnetic flux noise of the extremely low frequency (ELF) Schumann resonant (SR) magnetic antenna receiver and rods’ magnetic permeability measurement. The test fixture, for ELF the SR detector’s calibration, consists of a constructed coil, the...
In this paper, a prototype photoplethysmography (PPG) electronic device is presented for the distinction of individuals with congestive heart failure (CHF) from the healthy (H) by applying the concept of Natural Time Analysis (NTA). Data were collected simultaneously with a conventional three-electrode electrocardiography (ECG) system and our proto...
Background:
Voice disorders influence the quality of people's life. When the type of disorder is determined then the clinicians are capable of finding their patients' needs and address their complaints concerning their vocal problems. One of the most used tools, for assessing the patients' quality of life (in accordance with their vocal status), i...
Voice disorders often remain undiagnosed. Many self-perceived questionnaires exist for various medical conditions. Here, we used the Greek Voice Handicap Index (VHI) to address the aforementioned problem. Everyone can fill in the VHI questionnaire and rate their symptoms easily. The innovative feature of this research is the global cut-off score ca...
Data security plays a crucial role in healthcare monitoring systems, since critical patient information is transacted over the Internet, especially through wireless devices, wireless routes such as optical wireless channels, or optical transport networks related to optical fibers. Many hospitals are acquiring their own metro dark fiber networks for...
Several studies have shown that smoking is the primary candidate for provoking voice disorders in adults. This unwanted condition has unfortunately other additional unwanted effects. One strong effect which is the result of this study, is relevant to psychological affected aspect of subjects which smoked [1–4]. For the purpose of conducting this re...
Various therapies of voice disorders exist such as the kind of invasive treatments. On the contrary, a significant non-invasional method, demanding only the physical exercise of the subject, is Tango Voice Treatment Method [1]. Its beneficial results constitute this voice therapy as a standalone procedure even without hydration (not a strong factor...
In recent years, the usefulness of Green Technology along with the implementation of advanced wireless technologies led scientists towards investigating the effects of this advanced Green Technology to Human Resources. A large number of surveys have investigated the impact, of working conditions inside conventional buildings, on health, productivit...
The new era of the continuous deployment of wireless and sensory technology in conjunction to the rapid expansion of Green Buildings’ has led to a point of developing and enforcing specific rules and conditions. These conditions depend on the proper matching of Peoples’ temperament and Green Smart Buildings. In parallel, the rules are relevant to t...
The promotion of green growth has been a strategy for developed countries by improving the energy performance of residences. This tendency will help towards overcoming the continuously increasing greenhouse effect because the contribution of typical residences to the production of air pollutants is extremely high. Housing conditions (indoor air qua...
Green residences are known for their innovative character towards living conditions and low energy emissions. Their reduced ecological footprints design is not only limited to aforementioned but also include the construction of better environmental spaces and conditions even through transforming conventional buildings. Moreover, the psychological f...
Throughout the history of e-learning, the people with disabilities had to face a lot of omissions relevant to every aspect of their learning procedure [1]. These problems ranged from improper web designed pages to the improper way of confronting these types of our fellow citizens. This research takes into consideration the need for radical changes...
In the modern era of vast communication and information dissemination the need for radical security measures must be addressed. Specifically, as the Internet has a tremendous influence on people and especially on younger ones, new threats are added to existing ones such as the Blue Whale phenomenon [1]. The latter is continuously growing with the c...
Reading abilities in women seem to alter as age progresses and as cultural framework changes. Estrogen related changes also appear to contribute in reading abilities. Moreover, research shows that analphabetism affects women more than men which results in literacy difficulties. However, it is important to determine how different ages perceive their...
Robots as well-known are complex machines constituted of artificial parts and digital logic structures. Two key points need special attention in order an artificial humanoid to be finely developed. Firstly, the artificial structure must resemble to a human not only in the figure but moreover in expressed movements accomplishing a body language very...
Many problems arise for adults with literacy difficulties in the daily demanding environment. Those problems are probably the outcome of undetected and untreated literacy symptoms (as reading disabilities) at childhood. Recent findings suggest that such difficulties are more common amongst men than women. Considering the above, the purpose of this...
Coordination of speech musculature is strongly associated with neurological disorders also resulting from natural aging. Whichever is the cause, an important part of the assessment is the use of self-reported tools [1–8] to determine the patient’s needs and requests. One is the Adult Developmental Co-ordination Disorders/Dyspraxia Checklist (ADC)....
The motor that demands of speech production can be compromised by normal aging processes and thus it could change an individual’s precision and fluency. It is important to have individualized data on the motor difficulties which any person might face throughout his/her life to make the clinical process more efficient and client-oriented. To this di...
Cluttering is a fluency disorder characterized by an abnormally rapid rate. Several studies about its diagnosis were conducted based on different processes, such as articulation’s and phonological assessments and/or collection of spontaneous speech samples. Standardized diagnostic tools had not been proposed till Davis et al. suggested the “Predict...
Fluency disorders affects 1% of the population and over 3 million people in the United States. Cluttering is a disorder characterized by a rapid rate of speech that may appear as non-proper erratic pronunciation. Many guidelines were suggested for the evaluation of cluttering to the literature and one diagnostic procedure is the use of self-perceiv...
Fluency disorders and its etiologies was always of interest by mental health professionals. Cluttering -as a fluency disorder- is a clinical condition that needs to be diagnosed accurately and extensively. Self-perceived questionnaires are a new trend in evidence-based assessment, and gender is a factor that influences their results. Particularly,...
Anticipation of stuttering and its symptoms is a frequent but inadequately measured phenomenon of high importance in clinical evidence based practice. It is common in assessment procedure of stuttering—especially in kids—to use self-perceived questionnaires as in other disorders [1–9]. In the literature only one questionnaire is referred to adults’...
The collection and analysis of a language sample is of particular research and clinical interest due to its high validity [1–5]. The most widely used language indicator is the Mean Length of Utterance (MLU). MLU is usually counted in words (MLU-w) or morphemes (MLU-m). A brief review of the literature revealed a lack of research evidence which is w...
The factual study examines the use of language in a social context. The purpose of the research was to examine the use of language in 4-year-old children of typical language development, speaking the Cypriot dialect.
Language is a way of expression which is inherent in all people. Each person is born with the ability to develop language irrespective of nationality or language. However, some children may have language disorder or they may not have typical language development [1–4]. In order to diagnose a language disorder, clinicians use formal or informal asse...
The current research studied in depth the actual views of the parents of Greek Cypriot children with autistic spectrum disorder regarding the communication skills of their children at pre-school and primary school age.
Quite a few questionnaires have been created for the detection of autistic characteristics of average population. One of them is the Autism Spectrum Screening Questionnaire (ASSQ) [1]. It is consisted of 27 questions which detect impairments in socialization, communication and unfamiliar behaviors. ASSQ has been satisfactorily validated and used in...
Individuals, in the spectrum of autism, present difficulties in “empathising” and show higher results in “systemising” [1]. In general, women empathise more than men and in turn males systemise more than females [1–7]. Autism-Spectrum Quotient (AQ) is a 50-item self-administered questionnaire which was created to measure the level of autistic trait...
In this paper we present an experimental validated system for measuring rainfall due to radio frequency (RF) signal attenuation at 2 GHz. Measurements took place in Ioannina, NW Greece, starting in April 2015 and lasting for twelve months. The primary acquired extensive results have shown reliable and accurate measurements for rainfall amounts smal...
Voice performance is an inextricable key factor of everyday life. Obviously, the deterioration of voice quality can cause various problems to human communication and can therefore reduce the performance of social skills (relevant to voice). The deterioration could be originated from changes inside the system of the vocal tract and larynx. Various p...
- Real-time emerging applications are largely delay-sensitive
- In this context, Shannon's ergodic capacity cannot account for the transmission delay of the system.
- The effective capacity (EC) is an alternative metric that quantifies the system performance under QoS limitation.
- EC can be interpreted as the maximum constant arrival rate that a w...
Sometimes the perception and ability such as eating and swallowing, may affect the differential diagnosis of mental illnesses. Thus, the existence of an easy and reliable self-perceived tool in Greek language is essential so that professionals can gather more info as that will facilitate the clinical process and possibly prevent future complication...
Therapeutic programs for swallowing disorders are directly depended to a valid assessment by using objective and subjective methods. The subjective methods include the administration of self-assessment questionnaires so the self-perception of deglutition to be categorized. Moreover, self-assessment questionnaires can be quite beneficial if we take...
Assessment is important for the therapeutic decisions relevant to swallowing disorders.
Moreover, it is proper to detect symptoms in early stages via self-perceived questionnaires of swallowing abilities. All the above, underline the urgent need of constructing more validated self-assessment questionnaires being fully customizable in accordance to...
The correlation of clinical outcomes with reliable research evidence data is of great importance. This necessity is a fact for the Greek clinical practice and its data could help professionals. The use of self-perceived evidence data is a new trend [1-2]. The use of those type of questionnaires such as of Swallowing Disturbance Questionnaire (SDQ)...
Benefits like noninvasiveness, briefness and non-exposure to danger make the self assessment questionnaires ideal for both speech language pathologists and other clinicians. Their ability to provide evidence of symptoms in early stages or information for the perception of the individuals about their swallowing procedure makes them a useful tool. Th...
It has always been a challenge for clinicians concluding to an assessment that is both valid and accomplishable. The importance of an evident assessment is a necessity if we take into consideration that it determines the clinician’s diagnostic and therapeutic decisions. An essential part of the assessment is an individual’s self-perception of his/h...
Symptoms of feeding and swallowing in patients that have undergone laryngectomy are quite common. Thus, there is an enormous need for ongoing evident based diagnostic procedures, even in Greek language that will help health professionals to diagnose patients with such disorders [1-3]. This pilot study is focused on the evaluation of a patient-repor...
Dysphagia has a wide range of mental, medical and speech language pathology implications. Not only it affects swallowing and changes the diet habits but it also alters the quality of life. This is a quite common phenomenon in the elderly which suffer from multiple sclerosis (MS) and thus they may face social isolation and depression. Self-perceived...
Gender differences in cognitive functions of healthy older adults have been studied
widely in the past decades. Findings have shown that men, on average, outperform women at visuospatial tasks, whereas women have an advantage on verbal skills and episodic memory. Hence, the researchers focus on gender differences on the Mini-Mental State Examinatio...
Parkinson’s disease dementia (PDD), a neurodegenerative motor disorder associated
with cognitive decline, affects millions of individuals and can potentially have adverse
effects on their families. With these numbers growing by the day, researchers have started to examine the role of gender on PDD, as it can potentially contribute to the early prog...
Alzheimer’s disease (AD) is defined as a progressive neurodegenerative disease with the most prominent symptom being the deterioration of cognitive function. Similarly, Parkinson’s disease dementia (PDD) might demonstrate identical patterns of cognitive impairment, resulting in the misdiagnosis of these patients leading to a subsequently rise of th...
Attention Deficit & Hyperactivity Disorder (ADHD) is a mental disorder associated
with inability to concentrate and perform certain execution functions. Its evaluation can be based in interdisciplinary methods by using multimodal analysis. Self-perceived questionnaires are one of the evaluation methods which are gaining more evidence based data eve...