7 research outputs found
An investigation of the variability of start-up lost times and departure headways at signalized intersections in urban areas
No full textAn investigation of the variability of start-up lost times and departure headways at signalized intersections in urban areas
No full textSMoT: A Smartphone-Based Mobile Testbed for Human-Centric Wireless Networks
No full textRecently, wireless sensor networks (WSNs) are becoming vital to a wide range of application domains, from precision agriculture and smart buildings to health systems and monitoring of humans, animals, crowds and robots. In particular, there is an increasing number of sensor devices that are worn by persons who interact with them on a daily basis. In these applications, networks are formed by the persons who wear the sensor devices and as a result the mobility comes from them. This results in new protocols and applications for this kind of networks and new challenges arise. Human factors are crucial aspects in this case and researchers should consider them in their designs. The protocols and applications developed, should be tested and verified before their final deployment. We argue that a testbed, exposing the human characteristics is needed. In this thesis, we define the fundamental requirements that a testbed for experimentation with human-centric wireless networks must fulfil. We design and implement a fully functional testbed that allows researchers to run experiments in a realistic and controlled testing environment. We show that our testbed has the appropriate features and tools to make the running of the experiments easy and effortless. In addition, our testbed gives the ability to the researchers to observe how human diversity and variability (like body orientation or walking speed) affect their work. Furthermore, we evaluated the mechanisms of our testbed and present how they affect the execution of an experiment.MSc Embedded SystemsEmbedded Software GroupElectrical Engineering, Mathematics and Computer Scienc
Augmented Bridges: Investigating the potential of augmented reality for the design of configurable bridges
No full textThe paper expands on the potential of using Augmented Reality (AR) for the design and customization of bridges. Following a literature review on the use of AR in architectural design, and in particular in design education, the authors discuss educational experiences gained in two digital design studios. These two courses were taught remotely at the University of Thessaly and the Frankfurt University of Applied Sciences and cross-informed each other. The teaching experiences of the authors were evaluated and subsequently used to develop the curriculum of “Augmented Bridges”, an experimental AR design studio. The aim of the paper is to present current research in AR and the interactive design process of site-specific bridges, using digital and augmented media. The studio results offered valuable insight into the educational and creative value of AR technologies in architecture. © The Author(s) 2022
Peripapillary ROI selection demonstrated on 10-frame averaged OCTAs.
No full text(A) Choroidal OCTA and (B) superficial OCTA layers displaying the optic disc margin approximation (red ellipse). (C) Superficial layer with optic disc margin (red ellipse), 1° away from the optic disc margin (yellow ellipse), demarcation of the quadrants (cross in inner ellipse), and the five ~2x2° ROIs from each region. S = superior, ST = superotemporal, T = temporal, IT = inferotemporal, I = inferior. Images were contrast-stretched for display purposes only.</p
Recommended from our members
Writing The see-through man: poetry and commentary
No full text'Writing The See-Through Man: Poetry and Commentary' is a Creative Writing thesis in two parts. The first part is a collection of poems called The See-Through Man, written specifically for this project. It comprises thirty short poems (of approximately one page in length) and one long poem, '1969' (approximately sixty pages in length). The second part of the thesis is a personal, critical commentary which reflects on the evolution of the themes in this collection, from an initial desire to write about the male nude in art, to a desire to write about masculinity, to, finally, a desire to write autobiographically on issues of male embodiment. It reflects, retrospectively, on the creative processes behind the writing of the poems, with specific reference to technical experiments undertaken during the writing of key poems. It uses my own contemporaneous journals to piece together their 'histories', from idea to final draft. It also reflects on the influence of other poets and poetic traditions, with particular reference to the long poem, the prose-poem and the sonnet (and how assigning a central place to the sonnet grew out of a translation of Michelangelo). The sonnet, for example, comes to be understood as a metaphor for the Apollonian male body (considered to be a negative construct) and the versions of sonnets in the collection as examples of that form undergoing Dionysian adjustments
Study of Cu(In,Al)Se2 thin films prepared by selenisation of sputtered metallic precursors for application in solar cells
No full textCu-In, Cu-Al and Cu-In-Al metallic precursor layers were deposited using radio-frequency magnetron sputtering and selenised to produce thin films of CuInSe2 (CIS), CuAlSe2 (CAS) and CuIn1-xAlxSe2 (CIAS), respectively. The selenisation stage of this 2-stage process was carried out in a tube furnace (TF) or a rapid thermal processor (RTP) in the presence of elemental Se, either deposited on top of the precursor film or provided from an external source in the chamber, in order to fabricate the chalcopyrite material. The aim was to produce single phase, device quality CIS, CAS and CIAS for use as an absorber layer material in thin film photovoltaic solar cells. Profilometry performed on the as-deposited Cu-In-Al metallic precursors showed an important increase in surface roughness compared to the Cu-In and Cu-Al precursors. This was found to be due to the preferential formation of Cu9(In,Al)4, which stoichiometry led the excess In to form island-shaped In phases at the surface of the bulk, while only Cu2In and CuIn2 formed in Cu-In precursors. Regarding the selenisation, temperatures ranging from 250°C to 550°C were used, and the resulting samples were investigated using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), secondary ion mass spectroscopy (SIMS) and glow-discharge optical emission spectroscopy (GD-OES). Thin films of single phase CIS and CAS were successfully produced with energy band gaps of 0.99 eV and 2.68 eV, respectively. However the incorporation of Al proved to be difficult. The results showed that no incorporation of the Al into the chalcopyrite lattice was achieved in the samples selenised in the RTP, which was believed to be due to the oxidation of the element Al into amorphous Al2O3. In the tube furnace, possibly due to lower levels of oxidation, incorporation occurred more readily but Al and In segregated towards the back and front of the layer, respectively. The causes of the segregation were studied and solutions to avoid it developed, resulting under certain conditions in successful production of CuIn1-xAlxSe2. Samples were tested in a photoelectrochemical cell and showed (apparent) external quantum efficiency values comparable to a CuInSe2 (CIS) sample used as a standard
