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Konstantinos P. Tsagarakis
Business and Environmental Technology Economics Lab, Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, 67100, Xanthi, Greece

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Journal article
Published: 18 September 2020 in Journal of Big Data
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During the last decade, the use of online search traffic data is becoming popular in examining, analyzing, and predicting human behavior, with Google Trends being a popular tool in monitoring and analyzing the users' online search patterns in several research areas, like health, medicine, politics, economics, and finance. Towards the direction of exploring the Sterling Pound’s predictability, we employ Google Trends data from the last 5 years (March 1st, 2015 to February 29th, 2020) and perform predictability analysis on the Pound’s exchange rates to Euro and Dollar. The period selected includes the 2016 UK referendum as well as the actual Brexit day (January 31st, 2020), with the analysis aiming at analyzing the Pound’s relationships with Google query data on Pound-related keywords and topics. A quantile dependence method is employed, i.e., cross-quantilograms, to test for directional predictability from Google Trends data to the Pound’s exchange rates for lags from zero to 30 (in weeks). The results indicate that statistically significant quantile dependencies exist between Google query data and the Pound’s exchange rates, which point to the direction of one of the main implications in this field, that is to examine whether the movements in one economic variable can cause reactions in other economic variables.

ACS Style

Amaryllis Mavragani; Konstantinos Gkillas; Konstantinos P. Tsagarakis. Predictability analysis of the Pound’s Brexit exchange rates based on Google Trends data. Journal of Big Data 2020, 7, 1 -19.

AMA Style

Amaryllis Mavragani, Konstantinos Gkillas, Konstantinos P. Tsagarakis. Predictability analysis of the Pound’s Brexit exchange rates based on Google Trends data. Journal of Big Data. 2020; 7 (1):1-19.

Chicago/Turabian Style

Amaryllis Mavragani; Konstantinos Gkillas; Konstantinos P. Tsagarakis. 2020. "Predictability analysis of the Pound’s Brexit exchange rates based on Google Trends data." Journal of Big Data 7, no. 1: 1-19.

Journal article
Published: 25 February 2020 in Renewable Energy
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This contribution looks into logos as a powerful designing tool which can promote the implementation of Renewable Energy Sources (RES) policy. Given the lack of universal logo which would communicate the RES-derived products and services effectively, we initially explored the public’s emotions, thoughts, perceptions, images, experiences, beliefs and attitudes towards RES and non-RES through their design illustration. Experts decoded a total of 769 RES and 737 non-RES designs of four different sample groups ranging from the less informed children to well-informed engineers, and defined the design variables of a RES logo. On the basis of these design guidelines, professional designers created 60 RES logos. Besides, 432 participants randomly selected evaluated the logos on a score scale from 1 to 6. Interdisciplinary, cross-cultural and semiotic analysis of the winner logo revealed that in order to promote the RES use, a logo should be of round shape; present a sense of movement; convey a clear positive message; embed natural elements in the composition of the image with various hues of green, white and yellow-orange colours; include visually acute, religious and cultural symbols, and carry connotations of personal and social responsibility. This is the first attempt of designing a RES logo with public participation.

ACS Style

Kiriaki M. Keramitsoglou; Robert C. Mellon; Maria I. Tsagkaraki; Konstantinos P. Tsagarakis. Designing a logo for renewable energy sources with public participation: Empirical evidence from Greece. Renewable Energy 2020, 153, 1205 -1218.

AMA Style

Kiriaki M. Keramitsoglou, Robert C. Mellon, Maria I. Tsagkaraki, Konstantinos P. Tsagarakis. Designing a logo for renewable energy sources with public participation: Empirical evidence from Greece. Renewable Energy. 2020; 153 ():1205-1218.

Chicago/Turabian Style

Kiriaki M. Keramitsoglou; Robert C. Mellon; Maria I. Tsagkaraki; Konstantinos P. Tsagarakis. 2020. "Designing a logo for renewable energy sources with public participation: Empirical evidence from Greece." Renewable Energy 153, no. : 1205-1218.

Editorial
Published: 02 December 2019 in Renewable Energy
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ACS Style

Konstantinos P. Tsagarakis; Giovanna Biscontin; Marcelo Sanchez. Editorial. Renewable Energy 2019, 147, 2555 .

AMA Style

Konstantinos P. Tsagarakis, Giovanna Biscontin, Marcelo Sanchez. Editorial. Renewable Energy. 2019; 147 ():2555.

Chicago/Turabian Style

Konstantinos P. Tsagarakis; Giovanna Biscontin; Marcelo Sanchez. 2019. "Editorial." Renewable Energy 147, no. : 2555.

Article
Published: 31 October 2019 in Environment, Development and Sustainability
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The increasing interest in water protection creates a new complex business environment. On account of firms’ large-scale impacts on the environment and water resources as well as the important role of specific industry sectors, such as water utilities, in water protection, various groups of stakeholders have lately requested for firms to provide transparent and extensive information about their water management strategies implemented to deal with water risks and opportunities. In this regard, sustainability reports play a critical role in informing stakeholders about their water risk performance and management practices. Despite the popularity of sustainability reports as a communication tool for environmental and water-related information, there is not a widely applied technique for evaluating and reporting water risk information. To advance the water risk reporting practices, this paper develops an evaluation framework which could assist firms, especially water utilities, in disclosing accurate and detailed information and data about water risks. The proposed methodological framework was applied in a sample of water utilities in order to examine its applicability, highlighting the strong and weak points.

ACS Style

Thomas A. Tsalis; Ioannis E. Nikolaou; Konstantinos Tsagarakis. A benchmarking–scoring methodology for assessing the water risk disclosures of water utilities. Environment, Development and Sustainability 2019, 22, 6473 -6493.

AMA Style

Thomas A. Tsalis, Ioannis E. Nikolaou, Konstantinos Tsagarakis. A benchmarking–scoring methodology for assessing the water risk disclosures of water utilities. Environment, Development and Sustainability. 2019; 22 (7):6473-6493.

Chicago/Turabian Style

Thomas A. Tsalis; Ioannis E. Nikolaou; Konstantinos Tsagarakis. 2019. "A benchmarking–scoring methodology for assessing the water risk disclosures of water utilities." Environment, Development and Sustainability 22, no. 7: 6473-6493.

Journal article
Published: 01 October 2019 in Drones
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Drones have been employed for multiple uses, such as for military, surveillance, recreational, scientific, and research purposes. Their presence inside civil areas has necessitated the need to regulate their use. Towards this direction, many countries worldwide have issued national legislations, which vary on vehicle categorization according to the size, weight, flight altitude, purpose of use, and restrictions. In this study, we pursued the first comparative analysis of the Organization for Economic Co-operation and Development (OECD) countries’ national legislations, in order to explore the similarities and differences in drone use and recommend improvements and homogenization. Some of the examined countries issued legislation during recent years of drone application, while others amended their existing legislative framework in order to catch up with drone technology evolution. Although from the 35 OECD countries 22 belong to the European Union, we observed much diversity among national legal frameworks. The intensive use of drones has led to severe ethical dilemmas that policy makers will need to address in the near future. We conclude with a proposal regarding the basic legislation for different uses according to the criteria that have been developed so far, followed by limitations and restrictions.

ACS Style

Nikolaos Tsiamis; Loukia Efthymiou; Konstantinos P. Tsagarakis. A Comparative Analysis of the Legislation Evolution for Drone Use in OECD Countries. Drones 2019, 3, 75 .

AMA Style

Nikolaos Tsiamis, Loukia Efthymiou, Konstantinos P. Tsagarakis. A Comparative Analysis of the Legislation Evolution for Drone Use in OECD Countries. Drones. 2019; 3 (4):75.

Chicago/Turabian Style

Nikolaos Tsiamis; Loukia Efthymiou; Konstantinos P. Tsagarakis. 2019. "A Comparative Analysis of the Legislation Evolution for Drone Use in OECD Countries." Drones 3, no. 4: 75.

Journal article
Published: 28 June 2019 in Sustainability
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Awareness for organic products is low for young people. This paper sheds light on primary school pupils’ knowledge about organic products before and after a dedicated information session and analysis of their preferences for logos of organic products. Furthermore, we explore the intervention impact per grade. The analysis of 724 pupils’ responses, age ranged from 6 to 12 years, reveals gap in their knowledge about organic products. This intervention seems to affect more pupils older than 10 years. The majority of them would prefer the previously established organic logo with optional use to certify organic goods. Finally, the evaluation of logo drawings created by the pupils shows their slight preference for green colours and rounded shape. Our intervention can assist better design school curriculums regarding environmental related issues.

ACS Style

Aikaterini D. Kosta; Konstantinos P. Tsagarakis. Introducing the Concept of Organic Products to the Primary School Curriculum. Sustainability 2019, 11, 3559 .

AMA Style

Aikaterini D. Kosta, Konstantinos P. Tsagarakis. Introducing the Concept of Organic Products to the Primary School Curriculum. Sustainability. 2019; 11 (13):3559.

Chicago/Turabian Style

Aikaterini D. Kosta; Konstantinos P. Tsagarakis. 2019. "Introducing the Concept of Organic Products to the Primary School Curriculum." Sustainability 11, no. 13: 3559.

Journal article
Published: 09 April 2019 in Energies
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A techno-economic assessment has been carried out to evaluate the economic feasibility of energy self-consumption from a combination of photovoltaics and lead-acid batteries (PV-BAT). The Total annual economic cost (TAEC) and the cost per unit of energy were first calculated, from PV-BAT data collected over a 12 month period and then from energy system model data for the same period. A comparison of the actual renewable energy yield to optimal model output revealed that energy was restrained partially due to limited storage resources. The cost per kilowatt-hour for the two examined scenarios ranged from 0.55 to 0.62 €/kWh and from 0.42 to 0.46 €/kWh, respectively, showing room for further cost reductions. Despite currently lower energy purchasing costs from electricity providers, these findings constitute a significant price indication of the kilowatt-hour produced by PV-BAT, showing the need for further investigation into battery sizing can be optimized and battery cost can be reduced.

ACS Style

Ioannis E. Kosmadakis; Costas Elmasides; Dimitrios Eleftheriou; Konstantinos P. Tsagarakis. A Techno-Economic Analysis of a PV-Battery System in Greece. Energies 2019, 12, 1357 .

AMA Style

Ioannis E. Kosmadakis, Costas Elmasides, Dimitrios Eleftheriou, Konstantinos P. Tsagarakis. A Techno-Economic Analysis of a PV-Battery System in Greece. Energies. 2019; 12 (7):1357.

Chicago/Turabian Style

Ioannis E. Kosmadakis; Costas Elmasides; Dimitrios Eleftheriou; Konstantinos P. Tsagarakis. 2019. "A Techno-Economic Analysis of a PV-Battery System in Greece." Energies 12, no. 7: 1357.

Journal article
Published: 14 January 2019 in Journal of Big Data
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In addressing the challenge of Big Data Analytics, what has been of notable significance is the analysis of online search traffic data in order to analyze and predict human behavior. Over the last decade, since the establishment of the most popular such tool, Google Trends, the use of online data has been proven valuable in various research fields, including -but not limited to- medicine, economics, politics, the environment, and behavior. In the field of politics, given the inability of poll agencies to always well approximate voting intentions and results over the past years, what is imperative is to find new methods of predicting elections and referendum outcomes. This paper aims at presenting a methodology of predicting referendum results using Google Trends; a method applied and verified in six separate occasions: the 2014 Scottish Referendum, the 2015 Greek Referendum, the 2016 UK Referendum, the 2016 Hungarian Referendum, the 2016 Italian Referendum, and the 2017 Turkish Referendum. Said referendums were of importance for the respective country and the EU as well, and received wide international attention. Google Trends has been empirically verified to be a tool that can accurately measure behavioral changes as it takes into account the users’ revealed and not the stated preferences. Thus we argue that, in the time of intelligence excess, Google Trends can well address the analysis of social changes that the internet brings.

ACS Style

Amaryllis Mavragani; Konstantinos P. Tsagarakis. Predicting referendum results in the Big Data Era. Journal of Big Data 2019, 6, 3 .

AMA Style

Amaryllis Mavragani, Konstantinos P. Tsagarakis. Predicting referendum results in the Big Data Era. Journal of Big Data. 2019; 6 (1):3.

Chicago/Turabian Style

Amaryllis Mavragani; Konstantinos P. Tsagarakis. 2019. "Predicting referendum results in the Big Data Era." Journal of Big Data 6, no. 1: 3.

Journal article
Published: 06 January 2019 in Renewable Energy
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The design and operation of Shallow Geothermal Energy (SGE) systems have been continuously increasing in scientific research over the past years. What hinders the wide penetration of SGE systems in most countries are issues mostly related to high installation costs, administration, stakeholders' awareness, and marketing. On top of this, SGE systems lack an in-depth economic evaluation, which is often limited to the financial inputs, and thus omitting the non-market monetized environmental benefits. This paper consists of a primer for conceptually improving understanding in regions with low levels of SGE penetration. It provides guidance to project evaluation and discusses the social and institutional strategies to assist SGE systems penetration.

ACS Style

Konstantinos P. Tsagarakis. Shallow geothermal energy under the microscope: Social, economic, and institutional aspects. Renewable Energy 2019, 147, 2801 -2808.

AMA Style

Konstantinos P. Tsagarakis. Shallow geothermal energy under the microscope: Social, economic, and institutional aspects. Renewable Energy. 2019; 147 ():2801-2808.

Chicago/Turabian Style

Konstantinos P. Tsagarakis. 2019. "Shallow geothermal energy under the microscope: Social, economic, and institutional aspects." Renewable Energy 147, no. : 2801-2808.

Review
Published: 06 November 2018 in Journal of Medical Internet Research
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In the era of information overload, are big data analytics the answer to access and better manage available knowledge? Over the last decade, the use of Web-based data in public health issues, that is, infodemiology, has been proven useful in assessing various aspects of human behavior. Google Trends is the most popular tool to gather such information, and it has been used in several topics up to this point, with health and medicine being the most focused subject. Web-based behavior is monitored and analyzed in order to examine actual human behavior so as to predict, better assess, and even prevent health-related issues that constantly arise in everyday life. This systematic review aimed at reporting and further presenting and analyzing the methods, tools, and statistical approaches for Google Trends (infodemiology) studies in health-related topics from 2006 to 2016 to provide an overview of the usefulness of said tool and be a point of reference for future research on the subject. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines for selecting studies, we searched for the term "Google Trends" in the Scopus and PubMed databases from 2006 to 2016, applying specific criteria for types of publications and topics. A total of 109 published papers were extracted, excluding duplicates and those that did not fall inside the topics of health and medicine or the selected article types. We then further categorized the published papers according to their methodological approach, namely, visualization, seasonality, correlations, forecasting, and modeling. All the examined papers comprised, by definition, time series analysis, and all but two included data visualization. A total of 23.1% (24/104) studies used Google Trends data for examining seasonality, while 39.4% (41/104) and 32.7% (34/104) of the studies used correlations and modeling, respectively. Only 8.7% (9/104) of the studies used Google Trends data for predictions and forecasting in health-related topics; therefore, it is evident that a gap exists in forecasting using Google Trends data. The monitoring of online queries can provide insight into human behavior, as this field is significantly and continuously growing and will be proven more than valuable in the future for assessing behavioral changes and providing ground for research using data that could not have been accessed otherwise.

ACS Style

Amaryllis Mavragani; Gabriela Ochoa; Konstantinos P Tsagarakis. Assessing the Methods, Tools, and Statistical Approaches in Google Trends Research: Systematic Review. Journal of Medical Internet Research 2018, 20, e270 .

AMA Style

Amaryllis Mavragani, Gabriela Ochoa, Konstantinos P Tsagarakis. Assessing the Methods, Tools, and Statistical Approaches in Google Trends Research: Systematic Review. Journal of Medical Internet Research. 2018; 20 (11):e270.

Chicago/Turabian Style

Amaryllis Mavragani; Gabriela Ochoa; Konstantinos P Tsagarakis. 2018. "Assessing the Methods, Tools, and Statistical Approaches in Google Trends Research: Systematic Review." Journal of Medical Internet Research 20, no. 11: e270.

Review article
Published: 05 October 2018 in Science of The Total Environment
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This opinion paper focuses on the role of eco-toxicological tools in the assessment of possible impacts of emerging contaminants on the aquatic ecosystem, hence, on human health. Indeed, organic trace pollutants present in raw and treated wastewater are the pivot targets: a multidisciplinary approach allows defining the basic principles for managing this issue, from setting a proper monitoring campaign up to evaluating the optimal process treatment. Giving hints on trace pollutants fate and behaviour, attention is focused on the choice of the bioassay(s), by analysing the meaning of possible biological answers. Data interpretation and exploitation are detailed with the final goal of providing criteria in order to be able to select the best targeted treatment options. The manuscript deals with conventional and innovative analytical approaches for assessing toxicity, by reviewing laboratory and field assays; illustrative real scale and laboratory applications integrate and exemplify the proposed approach.

ACS Style

Roberta Pedrazzani; Giorgio Bertanza; Ivan Brnardić; Zeynep Cetecioglu; Jan Dries; Jolanta Dvarionienė; Antonio J. García-Fernández; Alette Langenhoff; Giovanni Libralato; Giusy Lofrano; Biljana Škrbić; Emma Martínez-López; Süreyya Meriç; Dragana Mutavdžić Pavlović; Matteo Papa; Peter Schröder; Konstantinos P. Tsagarakis; Christian Vogelsang. Opinion paper about organic trace pollutants in wastewater: Toxicity assessment in a European perspective. Science of The Total Environment 2018, 651, 3202 -3221.

AMA Style

Roberta Pedrazzani, Giorgio Bertanza, Ivan Brnardić, Zeynep Cetecioglu, Jan Dries, Jolanta Dvarionienė, Antonio J. García-Fernández, Alette Langenhoff, Giovanni Libralato, Giusy Lofrano, Biljana Škrbić, Emma Martínez-López, Süreyya Meriç, Dragana Mutavdžić Pavlović, Matteo Papa, Peter Schröder, Konstantinos P. Tsagarakis, Christian Vogelsang. Opinion paper about organic trace pollutants in wastewater: Toxicity assessment in a European perspective. Science of The Total Environment. 2018; 651 ():3202-3221.

Chicago/Turabian Style

Roberta Pedrazzani; Giorgio Bertanza; Ivan Brnardić; Zeynep Cetecioglu; Jan Dries; Jolanta Dvarionienė; Antonio J. García-Fernández; Alette Langenhoff; Giovanni Libralato; Giusy Lofrano; Biljana Škrbić; Emma Martínez-López; Süreyya Meriç; Dragana Mutavdžić Pavlović; Matteo Papa; Peter Schröder; Konstantinos P. Tsagarakis; Christian Vogelsang. 2018. "Opinion paper about organic trace pollutants in wastewater: Toxicity assessment in a European perspective." Science of The Total Environment 651, no. : 3202-3221.

Review
Published: 04 October 2018 in Renewable Energy
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Over the past years, the installations of Shallow Geothermal Energy (SGE) systems are increasing throughout Europe, and it is indicating that a specific and detailed legal framework is necessary. Towards this direction, this paper consists of an overview of legislation issues on SGE at European level, based on concise reviews from fourteen countries, i.e., Croatia, Cyprus, France, Greece, Italy, Latvia, Lithuania, Poland, Portugal, Serbia, Slovenia, Spain, Sweden, and Turkey. Said reviews discuss key national legislation as well as experts’ experience in the procedure of SGE integration. Legal and technical issues are also critically discussed for all involved countries, both individually and collectively. Findings show that high diversity exists on legislation provisions as well as on regulations, standards, and institutional support amongst European countries. The latter acts as an effective barrier for the further development of the SGE market; therefore indicating the need for a common approach. Increase of awareness, need for standardization, improvement of legal framework, and administration procedures and permitting, are essential steps in moving forward and supporting the effectiveness of design, construction, maintenance, and operation of SGE systems.

ACS Style

Konstantinos P. Tsagarakis; Loukia Efthymiou; Apostolos Michopoulos; Amaryllis Mavragani; Aleksandar Anđelković; Francesco Antolini; Mario Bacic; Diana Bajare; Matteo Baralis; Witold Bogusz; Sébastien Burlon; João Figueira; M. Serdar Genç; Saqib Javed; Andrius Jurelionis; Kemal Koca; Grzegorz Ryżyński; Javier F. Urchueguia; Bojan Žlender. A review of the legal framework in shallow geothermal energy in selected European countries: Need for guidelines. Renewable Energy 2018, 147, 2556 -2571.

AMA Style

Konstantinos P. Tsagarakis, Loukia Efthymiou, Apostolos Michopoulos, Amaryllis Mavragani, Aleksandar Anđelković, Francesco Antolini, Mario Bacic, Diana Bajare, Matteo Baralis, Witold Bogusz, Sébastien Burlon, João Figueira, M. Serdar Genç, Saqib Javed, Andrius Jurelionis, Kemal Koca, Grzegorz Ryżyński, Javier F. Urchueguia, Bojan Žlender. A review of the legal framework in shallow geothermal energy in selected European countries: Need for guidelines. Renewable Energy. 2018; 147 ():2556-2571.

Chicago/Turabian Style

Konstantinos P. Tsagarakis; Loukia Efthymiou; Apostolos Michopoulos; Amaryllis Mavragani; Aleksandar Anđelković; Francesco Antolini; Mario Bacic; Diana Bajare; Matteo Baralis; Witold Bogusz; Sébastien Burlon; João Figueira; M. Serdar Genç; Saqib Javed; Andrius Jurelionis; Kemal Koca; Grzegorz Ryżyński; Javier F. Urchueguia; Bojan Žlender. 2018. "A review of the legal framework in shallow geothermal energy in selected European countries: Need for guidelines." Renewable Energy 147, no. : 2556-2571.

Journal article
Published: 01 June 2018 in Renewable Energy
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ACS Style

Konstantinos P. Tsagarakis; Amaryllis Mavragani; Andrius Jurelionis; Iulia Prodan; Tugui Andrian; Diana Bajare; Aleksandrs Korjakins; Sarune Magelinskaite-Legkauskiene; Veres Razvan; Laura Stasiuliene. Clean vs. Green: Redefining renewable energy. Evidence from Latvia, Lithuania, and Romania. Renewable Energy 2018, 121, 412 -419.

AMA Style

Konstantinos P. Tsagarakis, Amaryllis Mavragani, Andrius Jurelionis, Iulia Prodan, Tugui Andrian, Diana Bajare, Aleksandrs Korjakins, Sarune Magelinskaite-Legkauskiene, Veres Razvan, Laura Stasiuliene. Clean vs. Green: Redefining renewable energy. Evidence from Latvia, Lithuania, and Romania. Renewable Energy. 2018; 121 ():412-419.

Chicago/Turabian Style

Konstantinos P. Tsagarakis; Amaryllis Mavragani; Andrius Jurelionis; Iulia Prodan; Tugui Andrian; Diana Bajare; Aleksandrs Korjakins; Sarune Magelinskaite-Legkauskiene; Veres Razvan; Laura Stasiuliene. 2018. "Clean vs. Green: Redefining renewable energy. Evidence from Latvia, Lithuania, and Romania." Renewable Energy 121, no. : 412-419.

Journal article
Published: 18 April 2018 in Sustainability
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Recycling bin design has been shown to be important in guiding and changing waste management practices. The top-down imposition of recycling scheme components, the various colour signage, the different types of recycling bins per material even in the same city, and in light of the limitations cited in the relevant literature, our contribution examines the citizens’ involvement in designing recycling bins. Analyzing the responses of 757 participants randomly selected, we initially defined design variables, i.e., shape, colour, and type of lid and insert slot. The next step was to design six bins per recyclable and non-recyclable material, which were printed in a card in a random order. In total, 12 cards were evaluated by 430 residents of a typical Greek town without previous experience in recycling; personal interviews were conducted and citizens gave a score on a scale from one to six. The results highlight the public preference for specific lids and insert slots, and a rectangular shape for all the materials apart from glass and compostables for engaging in recycling. In addition, the results suggest that a connection might exist between the colour of the recyclable material and the colour of the bin. When there is no particular bin colour preference for a material such as plastic or packages, various hues of orange, yellow, or purple dominate. A reward phrase or environmental message printed on the bins could encourage recycling.

ACS Style

Kiriaki Keramitsoglou; Konstantinos Tsagarakis. Public Participation in Designing the Recycling Bins to Encourage Recycling. Sustainability 2018, 10, 1240 .

AMA Style

Kiriaki Keramitsoglou, Konstantinos Tsagarakis. Public Participation in Designing the Recycling Bins to Encourage Recycling. Sustainability. 2018; 10 (4):1240.

Chicago/Turabian Style

Kiriaki Keramitsoglou; Konstantinos Tsagarakis. 2018. "Public Participation in Designing the Recycling Bins to Encourage Recycling." Sustainability 10, no. 4: 1240.

Journal article
Published: 12 March 2018 in JMIR Public Health and Surveillance
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Background: With the internet’s penetration and use constantly expanding, this vast amount of information can be employed in order to better assess issues in the US health care system. Google Trends, a popular tool in big data analytics, has been widely used in the past to examine interest in various medical and health-related topics and has shown great potential in forecastings, predictions, and nowcastings. As empirical relationships between online queries and human behavior have been shown to exist, a new opportunity to explore the behavior toward asthma—a common respiratory disease—is present. Objective: This study aimed at forecasting the online behavior toward asthma and examined the correlations between queries and reported cases in order to explore the possibility of nowcasting asthma prevalence in the United States using online search traffic data. Methods: Applying Holt-Winters exponential smoothing to Google Trends time series from 2004 to 2015 for the term “asthma,” forecasts for online queries at state and national levels are estimated from 2016 to 2020 and validated against available Google query data from January 2016 to June 2017. Correlations among yearly Google queries and between Google queries and reported asthma cases are examined. Results: Our analysis shows that search queries exhibit seasonality within each year and the relationships between each 2 years’ queries are statistically significant (P<.05). Estimated forecasting models for a 5-year period (2016 through 2020) for Google queries are robust and validated against available data from January 2016 to June 2017. Significant correlations were found between (1) online queries and National Health Interview Survey lifetime asthma (r=–.82, P=.001) and current asthma (r=–.77, P=.004) rates from 2004 to 2015 and (2) between online queries and Behavioral Risk Factor Surveillance System lifetime (r=–.78, P=.003) and current asthma (r=–.79, P=.002) rates from 2004 to 2014. The correlations are negative, but lag analysis to identify the period of response cannot be employed until short-interval data on asthma prevalence are made available. Conclusions: Online behavior toward asthma can be accurately predicted, and significant correlations between online queries and reported cases exist. This method of forecasting Google queries can be used by health care officials to nowcast asthma prevalence by city, state, or nationally, subject to future availability of daily, weekly, or monthly data on reported cases. This method could therefore be used for improved monitoring and assessment of the needs surrounding the current population of patients with asthma. [JMIR Public Health Surveill 2018;4(1):e24]

ACS Style

Amaryllis Mavragani; Alexia Sampri; Karla Sypsa; Konstantinos P Tsagarakis; Nicola Bragazzi; Zhu Zhang; Andrey Zheluk. Integrating Smart Health in the US Health Care System: Infodemiology Study of Asthma Monitoring in the Google Era. JMIR Public Health and Surveillance 2018, 4, e24 .

AMA Style

Amaryllis Mavragani, Alexia Sampri, Karla Sypsa, Konstantinos P Tsagarakis, Nicola Bragazzi, Zhu Zhang, Andrey Zheluk. Integrating Smart Health in the US Health Care System: Infodemiology Study of Asthma Monitoring in the Google Era. JMIR Public Health and Surveillance. 2018; 4 (1):e24.

Chicago/Turabian Style

Amaryllis Mavragani; Alexia Sampri; Karla Sypsa; Konstantinos P Tsagarakis; Nicola Bragazzi; Zhu Zhang; Andrey Zheluk. 2018. "Integrating Smart Health in the US Health Care System: Infodemiology Study of Asthma Monitoring in the Google Era." JMIR Public Health and Surveillance 4, no. 1: e24.

Journal article
Published: 12 March 2018 in Management of Environmental Quality: An International Journal
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Purpose The purpose of this paper is to address two research questions: which are the key factors that stimulate entrepreneurs to invest in ecopreneurship, and how ecopreneurhsip contributes to environmental sustainability. Design/methodology/approach To answer these questions, a framework has been developed to identify the incentives that lead entrepreneurs to invest in firms in the ecopreneurship through institutional and resource-based thinking. Findings From a survey of 91 Greek firms from the green service sector, it is shown that some specific institutional and resource-based view factors play a critical role in green entrepreneurs’ decisions, as well as some certain environmental practices that are frequently used by entrepreneurs to address environmental issues. Research limitations/implications First, the answer of the second research question through data collected by a questionnaire survey may be faced with skepticism by some authors, as it could be seen that entrepreneurs and managers of firms could have overstated their company's environmental activities. Second, although the sample selection of 91 firms is a representative sample (response rate 12.35 percent) of the total population of Greek green firms (761) and equal to other relative studies, a higher number of firms and a wider variety of green entrepreneurship ventures is necessary in future research. Practical implications The findings are useful for scholars, practitioners and policy makers since it provide information regarding the behavior of green entrepreneurs. Originality/value The paper analyze the types of green entrepreneurs in relation to the different features and strategies which are emerged from two theories, such as institutional and resource-based theory.

ACS Style

Ioannis E. Nikolaou; Konstantinos P. Tsagarakis; Kyriaki Tasopoulou. An examination of ecopreneurs’ incentives through a combination between institutional and resource-based approach. Management of Environmental Quality: An International Journal 2018, 29, 195 -215.

AMA Style

Ioannis E. Nikolaou, Konstantinos P. Tsagarakis, Kyriaki Tasopoulou. An examination of ecopreneurs’ incentives through a combination between institutional and resource-based approach. Management of Environmental Quality: An International Journal. 2018; 29 (2):195-215.

Chicago/Turabian Style

Ioannis E. Nikolaou; Konstantinos P. Tsagarakis; Kyriaki Tasopoulou. 2018. "An examination of ecopreneurs’ incentives through a combination between institutional and resource-based approach." Management of Environmental Quality: An International Journal 29, no. 2: 195-215.

Journal article
Published: 01 January 2018 in Water
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In addressing the topic of decision making in the water sector, what has been suggested to be useful up to this point is benchmarking. This paper aims at exploring the relationship between the Operating Cost Coverage Index and customer complaints about water and wastewater services for 1898 water utilities in 11 countries, i.e., Australia, Bangladesh, Brazil, Lithuania, Peru, Poland, Russia, Serbia, Tanzania, Zambia, and Zimbabwe. The data used are the most recent available per country through the International Benchmarking Network for Water and Sanitation Utilities (2013–2016). In order to examine the aforementioned relationship and further reveal the key policy messages that are derived by this analysis, parametric and non-parametric group comparisons are employed. The results of those comparisons concerning the two examined indicators of this study consist of two main findings: The first sheds light on the rational argument that well performing utilities open their data to others—at least more so than those not performing as well. The second is that there could be an association between financial performance and the complaints received about water and wastewater services, but this finding requires further investigation.

ACS Style

Konstantinos P. Tsagarakis. Operating Cost Coverage vs. Water Utility Complaints. Water 2018, 10, 27 .

AMA Style

Konstantinos P. Tsagarakis. Operating Cost Coverage vs. Water Utility Complaints. Water. 2018; 10 (1):27.

Chicago/Turabian Style

Konstantinos P. Tsagarakis. 2018. "Operating Cost Coverage vs. Water Utility Complaints." Water 10, no. 1: 27.

Article
Published: 09 November 2017 in Electronic Commerce Research
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This contribution looks into the survey mode effect using a randomized trial comparing data from paper-and-pencil and computerized web questionnaire concerning the willingness to buy (WTB) and the willingness to pay (WTP) for two food products certified as organic. A survey questionnaire was filled in by 110 university students for each mode in thermal comfort lab conditions. The design enables to study measurement variance specifically attributable to the mode of questionnaire completion (i.e. mode effect) and presentation of products (i.e. stimulus effect). While the two questionnaires were as similar as possible, the paper-and-pencil version involved the actual presentation of a tetra pack package of organic orange juice of 750 ml and a paper package of organic spaghetti of 500 g, but the computerized version involved their video projection. As regards the difference in substantive results, the prospective consumers “subjects” seemed to be more willing to buy the organic orange juice when presented live than presented on video embedded in the computerized questionnaire, while only women were willing to pay more for orange juice for the paper-and-pencil mode. No difference was found for the organic spaghetti product. As regards the response quality, in contrast to previous studies respondents wrote fewer words to the open-ended question in the computerized than in the paper-and-pencil version of the questionnaire. In addition, the study shows that using video clips as replacement for physical product presentations when measuring WTB and WTP as important concepts in consumer preference research needs further testing and evaluation as respondents may not react to them in the same way.

ACS Style

Kiriaki M. Keramitsoglou; Katja Lozar Manfreda; Charalampia Anastasiou; Knut Kalgraff Skjåk; Konstantinos P. Tsagarakis; Kiriaki Keramitsoglou. Mode comparison study on willingness to buy and willingness to pay for organic foods: paper-and-pencil versus computerized questionnaire. Electronic Commerce Research 2017, 18, 587 -603.

AMA Style

Kiriaki M. Keramitsoglou, Katja Lozar Manfreda, Charalampia Anastasiou, Knut Kalgraff Skjåk, Konstantinos P. Tsagarakis, Kiriaki Keramitsoglou. Mode comparison study on willingness to buy and willingness to pay for organic foods: paper-and-pencil versus computerized questionnaire. Electronic Commerce Research. 2017; 18 (3):587-603.

Chicago/Turabian Style

Kiriaki M. Keramitsoglou; Katja Lozar Manfreda; Charalampia Anastasiou; Knut Kalgraff Skjåk; Konstantinos P. Tsagarakis; Kiriaki Keramitsoglou. 2017. "Mode comparison study on willingness to buy and willingness to pay for organic foods: paper-and-pencil versus computerized questionnaire." Electronic Commerce Research 18, no. 3: 587-603.

Review
Published: 08 November 2017
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BACKGROUND In the era of information overload, are big data analytics the answer to access and better manage available knowledge? Over the last decade, the use of Web-based data in public health issues, that is, infodemiology, has been proven useful in assessing various aspects of human behavior. Google Trends is the most popular tool to gather such information, and it has been used in several topics up to this point, with health and medicine being the most focused subject. Web-based behavior is monitored and analyzed in order to examine actual human behavior so as to predict, better assess, and even prevent health-related issues that constantly arise in everyday life. OBJECTIVE This systematic review aimed at reporting and further presenting and analyzing the methods, tools, and statistical approaches for Google Trends (infodemiology) studies in health-related topics from 2006 to 2016 to provide an overview of the usefulness of said tool and be a point of reference for future research on the subject. METHODS Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines for selecting studies, we searched for the term “Google Trends” in the Scopus and PubMed databases from 2006 to 2016, applying specific criteria for types of publications and topics. A total of 109 published papers were extracted, excluding duplicates and those that did not fall inside the topics of health and medicine or the selected article types. We then further categorized the published papers according to their methodological approach, namely, visualization, seasonality, correlations, forecasting, and modeling. RESULTS All the examined papers comprised, by definition, time series analysis, and all but two included data visualization. A total of 23.1% (24/104) studies used Google Trends data for examining seasonality, while 39.4% (41/104) and 32.7% (34/104) of the studies used correlations and modeling, respectively. Only 8.7% (9/104) of the studies used Google Trends data for predictions and forecasting in health-related topics; therefore, it is evident that a gap exists in forecasting using Google Trends data. CONCLUSIONS The monitoring of online queries can provide insight into human behavior, as this field is significantly and continuously growing and will be proven more than valuable in the future for assessing behavioral changes and providing ground for research using data that could not have been accessed otherwise.

ACS Style

Amaryllis Mavragani; Gabriela Ochoa; Konstantinos P. Tsagarakis. Assessing the Methods, Tools, and Statistical Approaches in Google Trends Research: Systematic Review (Preprint). 2017, 1 .

AMA Style

Amaryllis Mavragani, Gabriela Ochoa, Konstantinos P. Tsagarakis. Assessing the Methods, Tools, and Statistical Approaches in Google Trends Research: Systematic Review (Preprint). . 2017; ():1.

Chicago/Turabian Style

Amaryllis Mavragani; Gabriela Ochoa; Konstantinos P. Tsagarakis. 2017. "Assessing the Methods, Tools, and Statistical Approaches in Google Trends Research: Systematic Review (Preprint)." , no. : 1.

Journal article
Published: 18 September 2017 in Recycling
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As waste management is becoming all the more crucial, this study investigates the way in which house left-over organic waste can be better managed on site, in order to minimize the off-site treatment cost and maximize environmental performance. For the implementation of this research, a full year measurement was recorded, showing the organic leftover waste food intake of two rabbits in a household of four. The organic food, collected in two separate baskets suitable for composting—though one for rabbit intake—was 168.5 kg in total, plus 68.8 kg, which was delivered directly to the composting bin, along with food remains and rabbit feces. The results show that, over the examined year, a total of up to 0.417 metric tons of CO2 equivalent per year emissions was avoided, suggesting that if 30 houses were to apply this methodology, one garbage truck journey per year would be saved. Overall, this study suggests that better information and environmental awareness can result in on-site, low cost, individual management of recyclable organic material, which would assist with the decrease in the cost of management, along with increased environmental performance.

ACS Style

Konstantinos P. Tsagarakis. Minimizing Onsite Organic Household Left-Over Waste: The Emission Benefits of Keeping Pet Rabbits. Recycling 2017, 2, 15 .

AMA Style

Konstantinos P. Tsagarakis. Minimizing Onsite Organic Household Left-Over Waste: The Emission Benefits of Keeping Pet Rabbits. Recycling. 2017; 2 (3):15.

Chicago/Turabian Style

Konstantinos P. Tsagarakis. 2017. "Minimizing Onsite Organic Household Left-Over Waste: The Emission Benefits of Keeping Pet Rabbits." Recycling 2, no. 3: 15.