1,091 research outputs found
tritrophic-dispersal-model: Code used for creating figures for "Non-hierarchical dispersal promotes stability and resilience in a tri-trophic metacommunity"
No full text<p>This is the commented code used for creating figures for the paper. Any questions regarding the code should be directed to the corresponding author and repository owner (Eric Pedersen). </p>
Odontites verna (Bell.) Dum. subsp. pumila (Nordst.) A. Pedersen in Nederland
No full textThe author gives a brief survey of ecology, distribution, and differences in flowering time of Odontites verna (Bell.) Dum. subsp. verna, subsp. litoralis (Fr.) A. Pedersen, subsp. fennica (Markl.), subsp. serotina (Wettst.) E. F. Warb., and subsp. pumila (Nordst.) A. Pedersen. In a description of the last named differential characters with subsp. serotina are stressed. Subsp. pumila is known from sandy pastures along the coasts of S. W. Sweden, Denmark, N. and N. W. Germany, and the Netherlands. Fig. 1 gives a map, showing the distribution in the Netherlands, based on the material of the Rijksherbarium, Leiden
DeCSIDH: Delegating Isogeny Computations in the CSIDH Setting
No full textsponsorship: This work was supported in part by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant agreement No. 101020788 -Adv-ERC-ISOCRYPT), the Research Council KU Leuven grant C14/18/067, and by CyberSecurity Research Flanders with reference number VR20192203. The author would like to thank Frederik Vercauteren and Osmanbey Uzunkol, as well as the anonymous reviewers for valuable feedback regarding this work. (European Research Council (ERC) under the European Union|101020788, Research Council KU Leuven|C14/18/067, CyberSecurity Research Flanders|VR20192203, European Research Council (ERC)|101020788)status: Publishe
Story, Hallie Pedersen
No full textReflections on the article "The Clarity That Comes With Hard Times" by author Margaret Renkl
Implicit large-eddy simulation of the stratocumulus-topped boundary layer: A grid sensitivity study
No full textA range of implicit large-eddy simulations of the stratocumulus-topped boundary layer is performed to study the influence of grid resolution on selected parameters including liquid water path and second and third moments of vertical velocity fluctuations. The simulations are based on two sets of aircraft measurements, which are also used to evaluate the results of the simulations. The specific case presented here indicates that simulations with a grid aspect ratio accounting for the anisotropic nature of the turbulence near the surface and at the top of the boundary layer lead to better agreement with measurements than simulations with an isotropic grid
Lashing Out after Stewing over Public Insults: The Effects of Public Provocation, Provocation Intensity, and Rumination on Triggered Displaced Aggression
No full textFour studies present the first evidence showing that public (vs. private) provocation augments triggered displaced aggression by increasing the perceived intensity of the provocation. This effect is shown to be independent of face-saving motivation. Following a public or private provocation, Study 1 participants were induced to ruminate or were distracted for 20 min. They then had an opportunity to aggress against another person who either acted in a neutral or mildly annoying fashion (viz. triggering event). As expected, the magnitude of the greater displaced aggression of those who ruminated before the triggering event compared with those distracted was greater under public than private provocation. Study 2 replicated the findings of Study 1 and confirmed that public provocations are experienced as more intense. Studies 3 and 4 both manipulated provocation intensity directly to show that it mediated the moderating effect of public/private provocation found in Study 1. The greater intensity of a public provocation increases reactivity to a subsequent trigger, which in turn, augments triggered displaced aggression
CSI-RAShi: Distributed Key Generation for CSIDH
No full textWe present an honest-majority Distributed Key Generation protocol (DKG) based on Shamir’s (k, n)-threshold secret sharing in the setting of Very Hard Homogenous Spaces (VHHS). DKGs in the discrete logarithm setting use Pedersen commitments, for which there is no known analogue in the VHHS setting. As a replacement, we introduce a new primitive called piecewise verifiable proofs, which allow a prover to prove that a list of NP-statements is valid with respect to a common witness, and such that the different statements can be verified individually. Our protocol is robust and actively secure in the Quantum Random Oracle Model. For n participants, the total runtime of our protocol is 2+λ+n(1+4λ)
group action evaluations, where λ
is the underlying security parameter, and is thus independent of the threshold k. When instantiated with CSIDH-512, this amounts to approximately 4.5+18n
seconds.sponsorship: Research Council KU Leuven|C14/18/067, Research Council KU Leuven|C14/18/067, CyberSecurity Research Flanders|VR20192203, FWO|1S95620Nstatus: Publishe
VSS from Distributed ZK Proofs and Applications
No full textNon-Interactive Verifiable Secret Sharing (NI-VSS) is a technique for distributing a secret among a group of individuals in a verifiable manner, such that shareholders can verify the validity of their received share and only a specific number of them can access the secret. VSS is a fundamental tool in cryptography and distributed computing. In this paper, we present an extremely efficient NI-VSS scheme using Zero-Knowledge (ZK) proofs on secret shared data. While prior VSS schemes have implicitly used ZK proofs on secret shared data, we specifically use their formal definition recently provided by Boneh et al. in CRYPTO 2019. The proposed NI-VSS scheme uses a quantum random oracle and a quantum computationally hiding commitment scheme in a black-box manner, which ensures its ease of use, especially in post-quantum threshold protocols. Implementation results further solidify its practicality and superiority over current constructions. With the new VSS scheme, for parameter sets and , a dealer can share a secret in less than and seconds, respectively, and shareholders can verify their shares in less than and milliseconds. Compared to the well-established Pedersen VSS scheme, for the same parameter sets, at the cost of slightly higher communication, the new scheme is respectively and faster in the sharing phase, and notably needs and less time in the verification. Leveraging the new NI-VSS scheme, we revisit several classic and PQ-secure threshold protocols and improve their efficiency. Our revisions led to more efficient versions of both the Pedersen DKG protocol and the GJKR threshold signature scheme. We show similar efficiency enhancements and improved resilience to malicious parties in isogeny-based DKG and threshold signature schemes. We think, due to its remarkable efficiency and ease of use, the new NI-VSS scheme can be a valuable tool for a wide range of threshold protocols
Diet data for haddock (Melanogrammus aeglefinus) from two capelin spawning areas in Finnmark County, Norway, during 2005 and 2006
No full textDiet data for haddock (Melanogrammus aeglefinus) were collected from two capelin (Mallotus villosus) spawning areas in Finnmark, Norway, during 2005–2006. Haddock were sampled using bottom trawl, and stomach content analysis was performed to estimate the proportions (wet weight) of various prey groups. The data were obtained and analyzed as part of a PhD project investigating predation on capelin eggs and capelin. These data are presented in the PhD thesis: Mikkelsen, N. (2013). Predation on the demersal fish eggs of capelin Mallotus villosus and lumpsucker Cyclopterus lumpus in relation to recruitment. PhD thesis, Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, University of Tromsoe. UiT The Arctic University of Norway (former University of Tromsoe) funded a Phd-scholarship for the first author (N. Mikkelsen
CSI-RAShi: Distributed key generation for CSIDH
No full textWe present an honest-majority Distributed Key Generation protocol (DKG) based on Shamir\u27s -threshold secret sharing in the setting of Very Hard Homogenous Spaces (VHHS). DKG\u27s in the DLOG setting use Pedersen commitments, for which there is no known analogue in the VHHS setting. As a replacement, we introduce a new primitive called piecewise verifiable proofs, which allow a prover to prove that a list of NP-statements is valid with respect to a common witness, and such that the different statements can be verified individually. Our protocol is robust and actively secure in the Quantum Random Oracle Model. For participants, the total runtime of our protocol is\break group action evaluations, where is the underlying security parameter, and is thus independent of the threshold . When instantiated with CSIDH-512, this amounts to approximately seconds
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