Factors influencing car user propensity to shift to other modes and their impacts on demand for airport parking facilities

Purpose: The aim of this paper is to analyse the factors influencing car user behaviour and examine the possible impacts of public transit improvements on the demand for airport long-term parking facilities. The case of the Athens International Airport (AIA) is considered for the analysis. Design/methodology: The followed approach comprises three steps: First the related literature is reviewed and the method is presented. Then data collection is carried out through a survey questionnaire comprising a revealed preference and a stated preference part. The compiled data is processed using factor analysis. Finally, the results are assessed leading to the drawing of final conclusions. Findings: The results of the analysis enable: (a) to determine different user groups with different demand elasticities and likelihoods to shift to public transport, and (b) to conclude from the quantitative representation of the different user groups the real impact on the car parking demand. Research limitations: The analysis gives no consideration to the mix of measures that can possibly increase competitiveness of parking services such as real-time information about availability of parking space to users; online booking and discount rates for early birds, etc. Originality/value: The paper includes original work based on primary data from a field survey, similar of which has not been published for the AIA. The results are important for airport authorities to keep a balance between parking demand and supply by formulating the right marketing policies.Peer Reviewe

Seamless-based Infomobility Applications to Support the Needs of All Travellers

Non

Fast Screening Method for the Assessment of Freight Demand at the Initial Planning Stage of a New Transport and Logistics Centers

This paper presents an empirical approach that allows pre-feasibility assessment of logistics infrastructure for defined locational and fleet constraints. It aims at developing a fast screening method for the assessment of demand of a public Transport and Logistics Center, which is important for properly selecting the Center’s size and minimising the risk of over or under-estimation of capacity needs. The results are useful for policy makers to facilitate the early planning and commercialisation phases of a TLC project. The method develops the appropriate cost functions in order to compare two logistics strategies: one that involves the use of TLC to achieve economies of scale, and another one that assumes direct deliveries from origin to destination to save time and handling costs. The method has been applied as a pilot study in a case of a regional Center in Greece, advocating its applicability and reusabilit

SHREC 2023: Point cloud change detection for city scenes

Localization and navigation are the two most important tasks for mobile robots, which require an up-to-date and accurate map. However, to detect map changes from crowdsourced data is a challenging task, especially from billions of points collected by 3D acquisition devices. Collecting 3D data often requires expensive data acquisition equipment and there are limited data sources to evaluate point cloud change detection. To address these issues, in this Shape Retrieval Challenge (SHREC) track, we provide a city-scene dataset with real and synthesized data to detect 3D point cloud change. The dataset consists of 866 pairs of object changes from 78 city-scene 3D point clouds collected by LiDAR and 845 pairs of object changes from 100 city-scene 3D point clouds generated by a high-fidelity simulator. We compare three methods on this benchmark. Evaluation results show that data-driven methods are the current trend in 3D point cloud change detection. Besides, the siamese network architecture is helpful to detect changes in our dataset. We hope this benchmark and comparative evaluation results will further enrich and boost the research of point cloud change detection and its applications

Factors influencing car user propensity to shift to other modes and their impacts on demand for airport parking facilities

Purpose: The aim of this paper is to analyse the factors influencing car user behaviour and examine the possible impacts of public transit improvements on the demand for airport long-term parking facilities. The case of the Athens International Airport (AIA) is considered for the analysis. Design/methodology: The followed approach comprises three steps: First the related literature is reviewed and the method is presented. Then data collection is carried out through a survey questionnaire comprising a revealed preference and a stated preference part. The compiled data is processed using factor analysis. Finally, the results are assessed leading to the drawing of final conclusions. Findings: The results of the analysis enable: (a) to determine different user groups with different demand elasticities and likelihoods to shift to public transport, and (b) to conclude from the quantitative representation of the different user groups the real impact on the car parking demand. Research limitations: The analysis gives no consideration to the mix of measures that can possibly increase competitiveness of parking services such as real-time information about availability of parking space to users; online booking and discount rates for early birds, etc. Originality/value: The paper includes original work based on primary data from a field survey, similar of which has not been published for the AIA. The results are important for airport authorities to keep a balance between parking demand and supply by formulating the right marketing policies.Peer Reviewe

A fuzzy multicriteria evaluation system for road tunnels

Η ανάπτυξη και δυναμική που εμφανίζουν τα τελευταία χρόνια τα έργα οδικής υποδομής τροφοδοτείται από το γενικότερο πνεύμα της αειφόρου ανάπτυξης που καθορίζει σε στρατηγικό επίπεδο τις επιλογές του σύγχρονου σχεδιασμού. Η ανάπτυξη της οικονομίας και οι επιπτώσεις της στην διαμόρφωση των σύγχρονων αναγκών και απαιτήσεων, σε συνδυασμό με την πρόοδο της τεχνολογίας που καθιστά ολοένα και περισσότερες κατασκευαστικές λύσεις οικονομικά και τεχνικά εφικτές, οδήγησαν στην αναζήτηση εναλλακτικών λύσεων που μπορούν να διασφαλίσουν καλύτερη ποιότητα οδικών υπηρεσιών, με έμφαση στην προστασία του περιβάλλοντος και στην βελτίωση της ποιότητας ζωής. Οι λύσεις αυτές αποσκοπούν εν μέρει και στη συχνότερη αξιοποίηση της τρίτης διάστασης, δηλαδή, στη δημιουργία υπόγειων χαράξεων με την κατασκευή σηράγγων. Ήδη από τα τέλη του προηγούμενου αιώνα, αρκετές σήραγγες έχουν κατασκευαστεί σε πολλές χώρες του κόσμου, συμβάλλοντας με επιτυχία στην εξυπηρέτηση των στόχων που επέβαλαν την επιλογή τους. […

Fast Screening Method for the Assessment of Freight Demand at the Initial Planning Stage of a New Transport and Logistics Centers

This paper presents an empirical approach that allows pre-feasibility assessment of logistics infrastructure for defined locational and fleet constraints. It aims at developing a fast screening method for the assessment of demand of a public Transport and Logistics Center, which is important for properly selecting the Center’s size and minimising the risk of over or under-estimation of capacity needs. The results are useful for policy makers to facilitate the early planning and commercialisation phases of a TLC project. The method develops the appropriate cost functions in order to compare two logistics strategies: one that involves the use of TLC to achieve economies of scale, and another one that assumes direct deliveries from origin to destination to save time and handling costs. The method has been applied as a pilot study in a case of a regional Center in Greece, advocating its applicability and reusability

Fractionation and characterization of Dunaliella microalgal biomass and extraction of carotenoids

This paper presents findings on the application of two fractionation protocols of Dunaliella microalgal biomass with the aim to separate and recover the lipid, pigment and protein fraction, leaving as “residue” the fraction that contains carbohydrates. The first protocol (LPC) is based on the initial extraction of lipids, followed by extraction of proteins, while in the second protocol (CLP), the pigments are first extracted followed by lipids extraction. With the LPC protocol the recovered lipid fraction was 34 and 32 wt%, while the recovered proteinic fraction was 46 and 50 wt% for the two samples under study, i.e. 1120 (D. granulata) and 1220 (D. minutissima). The CLP protocol led to the initial extraction of the pigment fraction with a percentage of 10–15 wt% while the subsequently recovered lipidic fraction was 16–24 wt%. The initial biomass was characterized for its moisture (<0.7 wt% for both samples), ash (approx. 45 wt% for both samples), organic matter, elemental composition and higher heating value (HHV) which was 23 and 30 MJ/kg (organic matter based-OMB). The composition of the lipid fraction was analyzed via esterification and gas chromatography (GC-FID) showing C16 and C18 as the predominant acids in the samples. The residue/carbohydrate fraction was analyzed via acid hydrolysis and analysis by high pressure liquid chromatography (HPLC) showing about 20 wt% (-OMB) content of carbohydrates. The high ash content of the biomass was found to be co-extracted during the fractionation protocols at a percentage of ≈49 % in the lipidic fraction and 45 % in the proteinic fraction. Furthermore, emphasis was given on pigment extraction and recovery using various solvents and quantification methods. Measurements of β-carotene, carotenoids, and chlorophyll content through UV and HPLC analyses is presented with chlorophyl and carotenoid content being ≈12 wt% and ≈9 wt% for samples 1120 and 1220 (-OMB). Additionally, a comparison between three solvents (THF, dichloromethane, acetone) was performed regarding their ability to extract the pigments from the microalgal biomass showing that acetone is capable of extracting pigments when concentration of the pigments is not high. The comparison of the HPLC with the UV method, suggested that UV spectroscopy is a reliable and rapid alternative for pigments determination, while HPLC enables identification and quantitative determination of specific pigments and chlorophyll species. The study provides insights for different fractionation protocols applied in two not yet fully studied Dunaliella species as well as the chlorophyl and carotenoid content

Circular economy in practice: the fenix project

Circular economy is a concept even more exploited by governments and companies to share green principles. However, its real adoption at industrial level remains limited to either small-scaled pilot plants or appositely constituted startups. The main aim of the FENIX project is the development of new business models and industrial strategies for three novel supply chains to enable value-added product-services. Through a set of success stories coming from the application of circular economy principles in different industrial sectors, FENIX wants to demonstrate in practice the real benefits coming from its adoption. In addition, Key Enabling Technologi es (KETs) will be integrated within the selected processes to impr ove the efficient recovery of secondary resource