Opin vísindi
Opin vísindi er varðveislusafn vísindaefnis og doktorsritgerða í opnum aðgangi á vegum íslenskra háskóla og Landsbókasafns Íslands - Háskólabókasafns.
Opinn aðgangur að rannsóknaniðurstöðum er í samræmi við 10. gr. laga nr. 3/2003 um opinberan stuðning við vísindarannsóknir sem og kröfur innlendra og erlendra rannsóknasjóða. Markmiðið með opnum aðgangi er að niðurstöður rannsókna séu aðgengilegar sem flestum óhindrað og án endurgjalds á rafrænu formi. Vistun í varðveislusafninu er varanleg og ætlað að tryggja aðgang að vísindaefni íslenskra háskóla í opnum aðgangi um ókomna tíð. Varðveislusafnið Opin vísindi er tengt við rannsóknagáttina IRIS og rannsóknaniðurstöður í opnum aðgangi sem eru skráðar í IRIS eru um leið vistaðar og gerðar aðgengilegar til framtíðar í varðveislusafninu. Með því að safna þessu efni saman í eitt safn verður aðgangur að því einfaldur og þægilegur fyrir alla sem vilja kynna sér það og geta þannig notið þess öfluga vísindastarfs sem fram fer í háskólum landsins.
Varðveislusafnið er OpenAIRE / OpenAIREplus samhæft og samrýmist kröfum sem gerðar eru um birtingu rannsóknaniðurstaðna úr verkefnum sem styrkt eru úr evrópsku rannsóknaáætlununum FP7 og H2020.
Varðveislusafnið notar opna hugbúnaðinn DSpace.
Opinn aðgangur að rannsóknaniðurstöðum er í samræmi við 10. gr. laga nr. 3/2003 um opinberan stuðning við vísindarannsóknir sem og kröfur innlendra og erlendra rannsóknasjóða. Markmiðið með opnum aðgangi er að niðurstöður rannsókna séu aðgengilegar sem flestum óhindrað og án endurgjalds á rafrænu formi. Vistun í varðveislusafninu er varanleg og ætlað að tryggja aðgang að vísindaefni íslenskra háskóla í opnum aðgangi um ókomna tíð. Varðveislusafnið Opin vísindi er tengt við rannsóknagáttina IRIS og rannsóknaniðurstöður í opnum aðgangi sem eru skráðar í IRIS eru um leið vistaðar og gerðar aðgengilegar til framtíðar í varðveislusafninu. Með því að safna þessu efni saman í eitt safn verður aðgangur að því einfaldur og þægilegur fyrir alla sem vilja kynna sér það og geta þannig notið þess öfluga vísindastarfs sem fram fer í háskólum landsins.
Varðveislusafnið er OpenAIRE / OpenAIREplus samhæft og samrýmist kröfum sem gerðar eru um birtingu rannsóknaniðurstaðna úr verkefnum sem styrkt eru úr evrópsku rannsóknaáætlununum FP7 og H2020.
Varðveislusafnið notar opna hugbúnaðinn DSpace.
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GRandLine : Adaptively Secure DKG and Randomness Beacon with (Log-)Quadratic Communication Complexity
(Association for Computing Machinery, Inc, 2024-12-09) Bacho, Renas; Lenzen, Christoph; Loss, Julian; Ochsenreither, Simon; Papachristoudis, Dimitrios; Department of Computer Science
A randomness beacon is a source of continuous and publicly verifiable randomness which is of crucial importance for many applications. Existing works on randomness beacons suffer from at least one of the following drawbacks: (i) security only against static (i.e., non-adaptive) adversaries, (ii) each epoch takes many rounds of communication, or (iii) computationally expensive tools such as proof-of-work (PoW) or verifiable delay functions (VDF). In this work, we introduce GRandLine, the first adaptively secure randomness beacon protocol that overcomes all these limitations while preserving simplicity and optimal resilience in the synchronous network setting. We achieve our result in two steps. First, we design a novel distributed key generation (DKG) protocol GRand that runs in O(?n2 logn) bits of communication but, unlike most conventional DKG protocols, outputs both secret and public keys as group elements. Here, ? denotes the security parameter. Second, following termination of GRand, parties can use their keys to derive a sequence of randomness beacon values, where each random value costs only a single asynchronous round and O(?n2) bits of communication. We implement GRandLine and evaluate it using a network of up to 64 parties running in geographically distributed AWS instances. Our evaluation shows that GRandLine can produce about 2 beacon outputs per second in a network of 64 parties. We compare our protocol to the state-of-the-art randomness beacon protocols OptRand (NDSS ‘23), BRandPiper (CCS ‘21), and Drand, in the same setting and observe that it vastly outperforms them.
Together in the Mikrokosmos : Exploring Disabled Embodied Experiences in Designed Sociotechnical Worlds
(2024-11-08) Ringland, Kathryn E.; Carstensdottir, Elin; Tung, Matthew; Seetharaman, Bhavani; Eagle, Tessa; Baltaxe-Admony, Leya Breanna; Weatherwax, Kevin; Department of Computer Science
For geographically dispersed communities, including professional, academic, hobbyist, and fandom communities, in-person events and meetups play a crucial role in the function and health of the whole community. Building off prior literature, we take a nuanced look at large scale community events that blend online and offline interactions across digital and physical embodied experiences in order to build understanding of how this knowledge can be leveraged to build more accessible hybrid modalities for community events. Building on this foundation, this paper presents a comprehensive study using ethnographic methods to examine large scale community events, specifically stadium music concerts of varying modalities (e.g., in-person, live-streamed). Using a disability lens, we explore how such community events are experienced and technologically mediated, as well as how the community and individuals design and construct their own sociotechnical worlds across multiple modalities and embodied experiences. By centering the disabled embodied experience, we examine how community members navigate the concert environment, time, and the social experience of concert attendance. Based on our findings, we highlight the nuanced complexities of inclusive community-centered large scale, multi-modal events.
Stability Analysis of Switched Linear Systems via Numeric Computations of Continuous Piecewise Affine and Continuous Piecewise Quadratic Lyapunov Functions
(University of Iceland, School of Engineering and Natural Sciences, Faculty of Physical Sciences, 2026-11-20) Andersen, Stefania; Sigurður Hafstein; Faculty of Physical Sciences (UI); Raunvísindadeild (HÍ); School of Engineering and Natural Sciences (UI); Verkfræði- og náttúruvísindasvið (HÍ)
In this dissertation we present numerical methods for computing continuous piecewise affine (CPA) and continuous piecewise quadratic (CPQ) Lyapunov functions via linear programming (LP) for switched linear systems. We discuss the application of these methods to both arbitrary switching signals and signals subject to average dwell-time (ADT) constraints. Further, we discuss the challenges of computing the minimum average dwell-time (MADT) and present a search algorithm for its computation. Finally, we discuss our approach to computing CPQ functions via LP, rather than semidefinite programming (SDP).
Geothermal fluid extraction and injection-related fracture slip susceptibility and seismicity in naturally fractured rocks
(2024-11) Cao, Wenzhuo; Durucan, Sevket; Shi, Ji Quan; Korre, Anna; Ratouis, Thomas; Hjörleifsdóttir, Vala; Department of Engineering
Understanding fracture slip susceptibility in geothermal reservoirs is central to the control of fluid injection-induced seismicity. To investigate the role of regional fracture systems on induced seismicity, a coupled thermo-hydro-mechanical (THM) model containing fracture networks was developed, which features direct coupling between different physics for explicit fractures, fractured rocks (porous matrix blocks with small-scale fractures) and their interactions, as well as indirect coupling through changes of material properties, such as stress-dependent fracture and rock permeabilities. The model was applied to simulate geothermal fluid extraction and re-injection in a natural fracture system comprised of three dominant fracture sets at the Hellisheiði geothermal field over a 10-year period (2011–2021), utilising field recorded monthly production and re-injection rates. Based on the model results, the slip susceptibility of regional fracture systems was examined under reservoir conditions before and after the start of fluid re-injection across different time scales, i.e., over short (1 month), intermediate (1 year) and long-term (10 years). Two model scenarios, one with cooling contraction and one without, were considered to examine the relative contribution of cooling contraction and fluid overpressure on fracture slip susceptibility. Results have shown that fracture networks act as preferential fluid flow paths that influence fluid pressure and stress distribution and fracture slip susceptibility in geothermal reservoirs. NE-SW and N-S trending fractures at Hellisheiði are susceptible to slippage before the start of fluid re-injection. During fluid re-injection, the distribution of fractures with enhanced slip susceptibility gradually shifts from surrounding the re-injection region to forming a two-lobed pattern in the fault-normal direction around the re-injection region, indicating the dominant role of cooling contraction over fluid overpressure on the fracture slip susceptibility in the intermediate- and long-term.
Pseudo-Scientist : Towards Narrative Interventions for Imposter Syndrome
(2024-10-15) Grasse, Katelyn M.; Junius, Nic; Weatherwax, Kevin; Sisodiya, Shweta; Martin, Amanda; Carstensdottir, Elin; Department of Computer Science
Imposter syndrome (IS) is a mental state that can severely inhibit a person’s productivity and well-being. Although IS is extremely common (especially in high achievers, e.g., academics), few studies offer effective modes of support and recovery. In response, we introduce the application of relatable narrative as a way to help people overcome IS. We present a randomized group comparison study exploring the impact of various design factors – specifically, choice-based interactivity and character relatability – on our story’s capacity to engage and impact 107 STEM undergraduates. Almost all participants enthusiastically endorsed the story as a valuable learning experience, and a majority reported positive impacts to mood and feelings of relatedness to peers. We discuss 1) how our specific digital story design can support positive changes in mental health at both individual and institutional levels and 2) how our findings can inform efficient design of interactive narrative content for educational applications.
Flokkar í Opnum vísindum
Veldu flokk til að skoða.
- University of Iceland
- University of Akureyri
- Bifröst University
- Hólar University College
- IRIS
- Agricultural University of Iceland
- National and University Library of Iceland
- Iceland University of the Arts