cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Bringing Balance to the Force: Dynamic Analysis of the Android Application Framework
Creators: name: Dawoud, Abdallah
name: Bugiel, Sven
Publisher: name: CISPA
Year: 2023

description: Android's application framework plays a crucial part in protecting users' private data and the system integrity. Consequently, it has been the target of various prior works that analyzed its security policy and enforcement. Those works uncovered different security problems, including incomplete documentation, permission re-delegation within the framework, and inconsistencies in access control. However, all but one of those prior works were based on static code analysis. Thus, their results provide a one-sided view that inherits the limitations and drawbacks of applying static analysis to the vast, complex code base of the application framework. Even more, the performances of different security applications---including malware classification and least-privileged apps---depend on those analysis results, but those applications are currently tarnished by imprecise and incomplete results as a consequence of this imbalanced analysis methodology. To complement and refine this methodology and consequently improve the applications that are dependent on it, we add dynamic analysis of the application framework to the current research landscape and demonstrate the necessity of this move for improving the quality of prior results and advancing the field. Applying our solution, called Dynamo, to four prominent use-cases from the literature and taking a synoptical view on the results, we verify but also refute and extend the existing results of prior static analysis solutions. From the manual investigation of the root causes of discrepancies between results, we draw new insights and expert knowledge that can be valuable in improving both static and dynamic testing of the application framework.
A theorem on fractional ID-(g,f)-factor-critical graphs
Creators: name: Zhou, Sizhong
name: Sun, Zhiren
name: Xu, Yang
Publisher: name: Faculty of Science, University of Calgary
Year: 2016
Subjects: graph; binding number; fractional $(g, f)$-factor, fractional ID-$(g, f)$-factor-critical graph.

description: Let $a$, $b$ and $r$ be three nonnegative integers with $2\leq a\leq b-r$, let $G$ be a graph of order $p$ satisfying the inequality $p(a+r) \geq (a+b-3)(2a+b+r)+1$, and let $g$ and $f$ be two integer-valued functions defined on $V(G)$ satisfying $a\leq g(x)\leq f(x)-r\leq b-r$ for every $x\in V(G)$. A graph $G$ is said to be fractional ID-$(g,f)$-factor-critical if $G-I$ contains a fractional $(g,f)$-factor for every independent set $I$ of $G$. In this paper, we prove that $G$ is fractional ID-$(g,f)$-factor-critical if $\operatorname{bind}(G)((a+r)p - (a+b-2)) > (2a+b+r-1)(p-1)$, which is a generalization of a previous result of Zhou.
description: Contributions to Discrete Mathematics, Vol 10, No 2 (2015)
On universally rigid frameworks on the line
Creators: name: Jordan, Tibor
name: Nguyen, Viet Hang
Publisher: name: Faculty of Science, University of Calgary
Year: 2016
Subjects: Universal rigidity; bar-and-joint framework; cover graph; generic rigidity; global rigidity; bipartite framework

description: A $d$-dimensional bar-and-joint framework $(G,p)$ with underlying graph $G$ is called universally rigid if all realizations of $G$ with the same edge lengths, in all dimensions, are congruent to $(G,p)$. We give a complete characterization of universally rigid one-dimensional bar-and-joint frameworks in general position with a complete bipartite underlying graph. We show that the only bipartite graph for which all generic $d$-dimensional realizations are universally rigid is the complete graph on two vertices, for all $d\geq 1$. We also discuss several open questions concerning generically universally rigid graphs and the universal rigidity of general frameworks on the line.
description: Contributions to Discrete Mathematics, Vol 10, No 2 (2015)
Double-Cropping Wheat and Soybeans in the Southeast
Creators: name: Marra, Michele C.
name: Carlson, Gerald A.
name: Marra, Michele C.
name: Carlson, Gerald A.
Publisher: name: Unknown
Year: 1986
Subjects: subject: Crop Production/Industries
subject: Farm Management
subject: Productivity Analysis
subject: Research Methods/ Statistical Methods
subject: Risk and Uncertainty
subject: Double-cropping
subject: wheat
subject: soybeans
subject: conservation tillage
subject: input use
subject: risk
subject: production under uncertainty
subject: pesticides

description: Southeastern farmers have increased their double-cropped wheat and soybean acreage by nearly half since 1970. Double-cropping, the raising of two crops per year in the same field, helps raise producer revenues and reduce total input use, since it encourages conservation tillage by farmers. But double-cropping seems to make soybean yields more variable and has helped to quadruple stockpiles of surplus soft red winter wheat since 1970. This report gives State data for double-cropping and examines the factors that caused the year-to-year expansions and contractions in double-cropped acres since the seventies.
Exploring User-Centered Security Design for Usable Authentication Ceremonies
Creators: name: Fassl, Matthias
name: Gröber, Lea
name: Krombholz, Katharina
Publisher: name: CISPA
Year: 2023

description: Security technology often follows a systems design approach that focuses on components instead of users. As a result, the users' needs and values are not sufficiently addressed, which has implications on security usability. In this paper, we report our lessons learned from applying a user-centered security design process to a well-understood security usability challenge, namely key authentication in secure instant messaging. Users rarely perform these key authentication ceremonies, which makes their end-to-end encrypted communication vulnerable. Our approach includes collaborative design workshops, an expert evaluation, iterative storyboard prototyping, and an online evaluation. While we could not demonstrate that our design approach resulted in improved usability or user experience, we found that user-centered prototypes can increase the users' comprehension of security implications. Hence, prototypes based on users' intuitions, needs, and values are useful starting points for approaching long-standing security challenges. Applying complementary design approaches may improve usability and user experience further.
A Lower Bound for Radio $k$-chromatic Number of an Arbitrary Graph
Creators: name: Kola, Srinivasa Rao
name: Panigrahi, Pratima
Publisher: name: Faculty of Science, University of Calgary
Year: 2016
Subjects: radio $k$-coloring; span; radio $k$-chromatic number

description: Radio $k$-coloring is a variation of Hale's channel assignment problem, in which one seeks to assign positive integers to the vertices of a graph $G$, subject to certain constraints involving the distance between the vertices. Specifically, for any simple connected graph $G$ with diameter $d$ and a
positive integer $k$, $1\leq k \leq d$, a radio $k$-coloring of $G$ is an assignment $f$ of positive integers to the vertices of $G$ such that $|f(u)-f(v)|\geq 1+k-d(u, v)$, where $u$ and $v$ are any two distinct vertices of $G$ and $d(u, v)$ is the distance between $u$ and $v$.
In this paper we give a lower bound for the radio $k$-chromatic number of an arbitrary
graph in terms of $k$, the total number of vertices $n$ and a
positive integer $M$ such that $d(u,v)+d(v,w)+d(u,w)\leq M$ for all $u,v,w\in V(G)$. If $M$ is the triameter we get a better lower bound. We also find the triameter $M$ for several graphs, and show that the lower bound obtained for these graphs is sharp for the case $k=d$.
description: Contributions to Discrete Mathematics, Vol 10, No 2 (2015)
Triangle-free Uniquely 3-Edge Colorable Cubic Graphs
Creators: name: Belcastro, Sarah-Marie
name: Haas, Ruth
Publisher: name: Faculty of Science, University of Calgary
Year: 2016
Subjects: edge coloring; unique coloring; triangle-free; cubic graphs

description: This paper presents infinitely many new examples of triangle-free uniquely 3-edge colorable cubic graphs.  The only such graph previously known was given by Tutte in 1976.
description: Contributions to Discrete Mathematics, Vol 10, No 2 (2015)
Mechanical Equilibrium of Hot, Large-Scale Magnetic Loops on T Tauri Stars
Creators: name: Aarnio, Alicia
name: Llama, Joe
name: Jardine, Moira
name: Gregory, Scott G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The most extended, closed magnetic loops inferred on T Tauri stars confine hot, X-ray emitting plasma at distances from the stellar surface beyond the the X-ray bright corona and closed large-scale field, distances comparable to the corotation radius. Mechanical equilibrium models have shown that dense condensations, or "slingshot prominences", can rise to great heights due to their density and temperatures cooler than their environs. On T Tauri stars, however, we detect plasma at temperatures hotter than the ambient coronal temperature. By previous model results, these loops should not reach the inferred heights of tens of stellar radii where they likely no longer have the support of the external field against magnetic tension. In this work, we consider the effects of a stellar wind and show that indeed, hot loops that are negatively buoyant can attain a mechanical equilibrium at heights above the typical extent of the closed corona and the corotation radius.
description: 6 pages, 5 figures. Accepted for publication in MNRAS
Increasing thermoelectric performance using coherent transport
Creators: name: Karlstrom, Olov
name: Linke, Heiner
name: Karlstrom, Gunnar
name: Wacker, Andreas
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show that coherent electron transport through zero-dimensional systems can be used to tailor the shape of the system's transmission function. This quantum-engineering approach can be used to enhance the performance of quantum dots or molecules in thermal-to-electric power conversion. Specifically, we show that electron interference in a two-level system can substantially improve the maximum thermoelectric power and the efficiency at maximum power by suppressing parasitic charge flow near the Fermi energy, and by reducing electronic heat conduction. We discuss possible realizations of this approach in molecular junctions or quantum dots.
description: 4+ pages, 4 figures
Investigating Car Drivers' Information Demand after Safety and Security Critical Incidents
Creators: name: Gröber, Lea
name: Fassl, Matthias
name: Gupta, Abhilash
name: Krombholz, Katharina
Publisher: name: CISPA
Year: 2023

description: Modern cars include a vast array of computer systems designed to remove the burden on drivers and enhance safety. As cars are evolving towards autonomy and taking over control, e.g. in the form of autopilots, it becomes harder for drivers to pinpoint the root causes of a car's malfunctioning. Drivers may need additional information to assess these ambiguous situations correctly. However, it is yet unclear which information is relevant and helpful to drivers in such situations. Hence, we conducted a mixed-methods online survey N=60 on Amazon MTurk where we exposed participants to two security- and safety-critical situations with one of three different explanations. We applied Thematic and Correspondence Analysis to understand which factors in these situations moderate drivers’ information demand. We identified a fundamental information demand across scenarios that is expanded by error-specific information types. Moreover, we found that it is necessary to communicate error sources, since drivers might not be able to identify them correctly otherwise. Thereby, malicious intrusions are typically perceived as more critical than technical malfunctions.
Refractive Convergent Plasma Lenses explain ESE and pulsar scintillation
Creators: name: Pen, Ue-Li
name: King, Lindsay
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We propose convergent plasma lenses, possibly from current sheets, as a generic solution to strong interstellar scattering. These lenses resolve the overpressure problem by geometric alignment as noted by Goldreich and Shridhar (2006). They further quantitatively explain properties of extreme scattering events, and pulsar parabolic arcs. This model makes quantitative predictions testable by VLBI on scattering events. It differs conceptually from previous models by occurring through rare, localized underdense sheets. Such sheets are thermally and kinematically stable, and could be consequences of reconnection. The apparent diffractive effects are a result of coherent interference of refractive images. We propose that these lenses can be used for precision distance determination to pulsars, enabling accurate gravity source localization.
description: 5 pages, 4 figures
Phase diagram of the extended Bose Hubbard model
Creators: name: Rossini, Davide
name: Fazio, Rosario
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: By means of the Density Matrix Renormalization Group technique, we accurately determine the zero-temperature phase diagram of the one-dimensional extended Bose Hubbard model with on-site and nearest-neighbor interactions. We analyze the scaling of the charge and of the neutral ground-state energy gaps, as well as of various order parameters. In this way we come to an accurate location of the boundaries between the superfluid and the insulating phases. In this last region we are able to distinguish between the conventional Mott insulating and density-wave phases, and the Haldane Insulator phase displaying long-range string ordering, as originally predicted by E.G. Dalla Torre, E. Berg and E. Altman in Phys. Rev. Lett. 97, 260401 (2006).
description: 13 pages, 6 figures. To appear in NJP, in the focus issue on "Bose Condensation Phenomena in Atomic and Solid State Physics"
Kinetics of a frictional granular motor
Creators: name: Talbot, Julian
name: Wildman, Ricky D.
name: Viot, Pascal
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Within the framework of a Boltzmann-Lorentz equation, we analyze the dynamics of a granular rotor immersed in a bath of thermalized particles in the presence of a frictional torque on the axis. In numerical simulations of the equation, we observe two scaling regimes at low and high bath temperatures. In the large friction limit, we obtain the exact solution of a model corresponding to asymptotic behavior of the Boltzmann-Lorentz equation. In the limit of large rotor mass and small friction, we derive a Fokker-Planck equation for which the exact solution is also obtained.
description: 4 pages, 4 Figures, To be published in Phys. Rev. Lett
Ni(111)|Graphene|h-BN Junctions as Ideal Spin Injectors
Creators: name: Karpan, Volodymyr M.
name: Khomyakov, Petr A.
name: Giovannetti, Gianluca
name: Starikov, Anton A.
name: Kelly, Paul J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Deposition of graphene on top of hexagonal boron nitride (h-BN) was very recently demonstrated while graphene is now routinely grown on Ni. Because the in-plane lattice constants of graphite, h-BN, graphite-like BC2N and of the close-packed surfaces of Co, Ni and Cu match almost perfectly, it should be possible to prepare ideal interfaces between these materials which are respectively, a semimetal, insulator, semiconductor, ferromagnetic and nonmagnetic metals. Using parameter-free energy minimization and electronic transport calculations, we show how h-BN can be combined with the perfect spin filtering property of Ni|graphite and Co|graphite interfaces to make perfect tunnel junctions or ideal spin injectors (SI) with any desired resistance-area product.
description: 4 pages, 4 figures. Accepted for publication in Physical Review B
On bisectors in normed planes
Creators: name: Jahn, Thomas
name: Spirova, Margarita
Publisher: name: Faculty of Science, University of Calgary
Year: 2016
Subjects: Bisector; normed plane; norming functional

description: In this note, we completely describe the shape of the bisector of two given points in a two-dimensional normed vector space. More precisely, we show that, depending on the position of two given points with respect to the shape of the unit circle, the following holds: the bisector of a non-strict pair of points consists of two cones and a curve, which has properties similar to those of bisectors of strict pairs of points.
description: Contributions to Discrete Mathematics, Vol 10, No 2 (2015)
Optimizing Observational Strategy for Future Fgas Constraints
Creators: name: Galli, Silvia
name: Bartlett, James G.
name: Melchiorri, Alessandro
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Planck cluster catalog is expected to contain of order a thousand galaxy clusters, both newly discovered and previously known, detected through the Sunyaev-Zeldovich effect over the redshift range 0 < z < 1. Follow-up X-ray observations of a dynamically relaxed sub-sample of newly discovered Planck clusters will improve constraints on the dark energy equation-of-state found through measurement of the cluster gas mass fraction fgas. In view of follow-up campaigns with XMM-Newton and Chandra, we determine the optimal redshift distribution of a cluster sample to most tightly constrain the dark energy equation of state. The distribution is non-trivial even for the standard w0-wa parameterization. We then determine how much the combination of expected data from the Planck satellite and fgas data will be able to constrain the dark energy equation-of-state. Our analysis employs a Markov Chain Monte Carlo method as well as a Fisher Matrix analysis. We find that these upcoming data will be able to improve the figure-of-merit by at least a factor two.
description: 11 pages, 8 figures
LIGHTBLUE: Automatic Profile-Aware Debloating of Bluetooth Stacks
Creators: name: Wu, Jianliang
name: Wu, Ruoyu
name: Antonioli, Daniele
name: Payer, Mathias
name: Tippenhauer, Nils Ole
name: Xu, Dongyan
name: Tian, Dave (Jing)
name: Bianchi, Antonio
Publisher: name: CISPA
Year: 2023

description: The Bluetooth standard is ubiquitously supported by com- puters, smartphones, and IoT devices. Due to its complex- ity, implementations require large codebases, that are prone to security vulnerabilities, such as the recently discovered BlueBorne and BadBluetooth attacks. While defined by the standard, most of the Bluetooth functionality, as defined by different Bluetooth profiles, is not required in the common usage scenarios. Starting from this observation, we implement L IGHT B LUE , a framework performing automatic, profile-aware debloating of Bluetooth stacks, allowing users to automatically minimize their Bluetooth attack surface by removing unneeded Blue- tooth features. L IGHT B LUE starts with a target Bluetooth application, detects the associated Bluetooth profiles, and ap- plies a combination of control-flow and data-flow analysis to remove unused code within a Bluetooth host code. Fur- thermore, to debloat the Bluetooth firmware, L IGHT B LUE extracts the used Host Controller Interface (HCI) commands and patches the HCI dispatcher in the Bluetooth firmware au- tomatically, so that the Bluetooth firmware avoids processing unneeded HCI commands. We evaluate L IGHT B LUE on four different Bluetooth hosts and three different Bluetooth controllers. Our evaluation shows that L IGHT B LUE achieves between 32% and 50% code reduction in the Bluetooth host code and between 57% and 83% HCI command reduction in the Bluetooth firmware. This code reduction leads to the prevention of attacks responsible for at least 20 CVEs, such as BlueBorne and BadBluetooth, while introducing no performance overhead and without af- fecting the behavior of the debloated application.
Integrated spectra extraction based on signal-to-noise optimization using Integral Field Spectroscopy
Creators: name: Rosales-Ortega, F. F.
name: Arribas, S.
name: Colina, L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We propose and explore the potential of a method to extract high signal-to-noise (S/N) integrated spectra related to physical and/or morphological regions on a 2-dimensional field using Integral Field Spectroscopy (IFS) observations by employing an optimization procedure based on either continuum (stellar) or line (nebular) emission features. The optimization method is applied to a set of IFS VLT-VIMOS observations of (U)LIRG galaxies, describing the advantages of the optimization by comparing the results with a fixed-aperture, single spectrum case, and by implementing some statistical tests. We demonstrate that the S/N of the IFS optimized integrated spectra is significantly enhanced when compared with the single aperture unprocessed case. We provide an iterative user-friendly and versatile IDL algorithm that allows the user to spatially integrate spectra following more standard procedures. This is made available to the community as part of the PINGSoft IFS software package.
description: Accepted for publication in Astronomy & Astrophysics, 12 pages, 7 figures
Trends In Double Cropping
Creators: name: Hexem, Roger W.
name: Boxley, Robert F.
name: Hexem, Roger W.
name: Boxley, Robert F.
Publisher: name: Unknown
Year: 1986
Subjects: subject: Crop Production/Industries
subject: Farm Management
subject: Double cropping
subject: conservation tillage
subject: cropping systems
subject: management

description: U.S. farmers increased double-cropped acreage from 5.8 to 12.4 million acres during 1974-82, from 1.9 percent of all acres harvested in 1974 to nearly 4 percent in 1982. Double cropping was expanding because of rising commodity prices and producers' adoption of advanced technologies in plant varieties and farming practices. Appalachia, the Delta States, and the Southeast showed the sharpest growth in double cropping, partly because growing seasons there are relatively long. Double cropping declined after 1982 because of weak soybean prices. Government-sponsored idling of some wheat acreage that would otherwise have been double cropped, and unfavorable weather in several important double-cropping areas.
title: Multiphasic aqueous hydroformylation of 1-alkenes with micelle-like polymer particles as phase transfer agents
Creators: name: Bibouche, Bachir
name: Peral, Daniel
name: Stehl, Dmitrij
name: Söderholm, Viktor
name: Schomäcker, Reinhard
name: Klitzing, Regine von
name: Vogt, Dieter
Publisher: name: Royal Society of Chemistry
Year: 2021

description: Micelle-like polymer particles have been applied in aqueous multiphasic hydroformylation reactions of long chain alkenes. These colloids act as phase transfer agents for the nonpolar substrates and as carriers for the catalyst bearing sulfonated ligands by electrostatic attraction. The catalyst performance and the phase separation were optimized with special focus on the conversion, selectivity and catalyst recovery, as those are key points in multiphasic systems to achieve a feasible industrial process. The effect on the catalyst performance of the number of sulfonate groups and electron withdrawing trifluoromethyl groups in the ligand has been studied. The approach was successfully demonstrated for 1-alkenes from 1-hexene to 1-dodecene. For 1-octene, a TOF of more than 3000 h⁻¹ could be achieved at a substrate to catalyst ratio of 80 000, while keeping the rhodium and phosphorous leaching below 1 ppm. In repetitive batch experiments the catalyst was recycled four times, yielding an accumulated TON of more than 100 000 for 1-octene.
Noisy optimal control strategies for modelling saccades
Creators: name: Jones, Garrett L.
Publisher: name: University of British Columbia
Year: 2011

description: Eye movements have for a while provided us a closer view into how the brain commands the body. Particularly interesting are saccades: fast and accurate eye movements that allow us to scan our visual surroundings. One observation is that motor commands issued by the brain are corrupted by a signal-dependent noise. Moreover, the variance of the signal scales linearly with the control signal squared. It is assumed that such uncertainty in the dynamics introduces a probability distribution of the eye that the brain accounts for during motion planning. We propose a framework for computing the optimal control law for arbitrary dynamical systems, subject to noise, and where the cost function depends on a statistical distribution of the eye’s position. A key contribution of this framework is estimating the endpoint distribution of the plant using Monte Carlo sampling, which is done efﬁciently using commodity graphics hardware in parallel. We then describe a modiﬁed form of gradient descent for computing the optimal control law for an objective function prone to stochastic effects. We compare our approach to other methods, such as downhill simplex and Covariance-Matrix-Adaptation, which are considered “gradient-free” approaches to optimization. We ﬁnally conclude with several examples that show the framework successfully controlling saccades for different plant models of the oculomotor system: this includes a 3D torque-based model of the eye, and a a nonlinear model of the muscle actuator that drives the eye.
Scales of the magnetic fields in the quiet Sun
Creators: name: Ariste, A. López
name: Dalda, A. Sainz
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context: The presence of a turbulent magnetic field in the quiet Sun has been unveiled observationally using different techniques. The magnetic field is quasi-isotropic and has field strengths weaker than 100G. It is pervasive and may host a local dynamo. Aims: We aim to determine the length scale of the turbulent magnetic field in the quiet Sun. Methods: The Stokes V area asymmetry is sensitive to minute variations in the magnetic topology along the line of sight. Using data provided by Hinode-SOT/SP instrument, we performed a statistical study of this quantity.We classified the different magnetic regimes and infer properties of the turbulent magnetic regime. In particular we measured the correlation length associated to these fields for the first time. Results: The histograms of Stokes V area asymmetries reveal three different regimes: one organized, quasi-vertical and strong field (flux tubes or other structures of the like); a strongly asymmetric group of profiles found around field concentrations; and a turbulent isotropic field. For the last, we confirm its isotropy and measure correlation lengths from hundreds of kilometers down to 10km, at which point we lost sensitivity. A crude attempt to measure the power spectra of these turbulent fields is made. Conclusions: In addition to confirming the existence of a turbulent field in the quiet Sun, we give further prove of its isotropy.We also measure correlation lengths down to 10km. The combined results show magnetic fields with a large span of length scales, as expected from a turbulent cascade.
description: 11 pages, 6 figures. Accepted for publication in A&A
COTS Drone Detection Using Video Streaming Characteristics
Creators: name: Alsoliman, Anas
name: Rigoni, Giulio
name: Levorato, Marco
name: Pinotti, Cristina
name: Tippenhauer, Nils Ole
name: Conti, Mauro
Publisher: name: CISPA
Year: 2023

description: Cheap commercial off-the-shelf (COTS) drones have become widely available for consumers in recent years. Unfortunately, they also provide low-cost capabilities for attackers. Therefore, effective methods to detect the presence of non-cooperating rogue drones within a restricted area are highly required. Approaches based on detection of control traffic have been proposed but were not yet shown to work against other benign traffic, such as that generated by wireless security cameras. In this work, we propose a novel drone detection framework based on a Random Forest classification model. In essence, the framework leverages specific patterns in video traffic transmitted by drones. The patterns consist of repetitive synchronization packets (denoted as pivots) which we use as features in the proposed machine learning classifier. We show that our framework can achieve up to 99% detection accuracy over an encrypted WiFi channel using only 20 packets originated from the drone. Our system is able to identify drone transmissions even among very similar WiFi transmission (such as a security camera video stream) and in a noisy scenario with background traffic.
Development and analysis of the precision micro milling system
Creators: name: Chae, Jaehee
Publisher: name: University of Calgary
Year: 2006

description: Bibliography: p. 110-122
description: The miniaturization of machine components plays a very important role in the future technological development of a broad spectrum of product owing to various advantages low material cost, portability, implant, lower power consumption and higher heat transfer since their surface-to-volume ratio is very high. In particular, one of the manufacturing processes for small parts is micro-mechanical machining. Similar to macro machining processes, the micro machining process can create three dimensional parts on a micro scale with various engineering materials (i.e. metallic alloys, ceramics, plastics) using miniature tools. The micro machining processes have several unique elements such as small size tools, high spindle speed, and miniaturized machine tools. This thesis focuses on several aspects of micro machining operations in order to improve the performance of micro machining process. The survey of the current efforts in micro-mechanical machining investigated various aspects such as current research directions, limitations, similarities and differences between macro and micro in order to understand the fundamental knowledge of micro mechanical machining. The prediction of the joint dynamics is vital to evaluate the micro machine tool performances through its dynamics because the joint plays significant roles in the micro system's behavior because the size of joint is relatively close to the assembled system. The fastener joint dynamics are identified with the classic receptance coupling technique. The proposed method is enhanced by identifing the joint dynamics between substructures through experimental and finit lement analyse . This novel identification method increase the accuracy of the dynamic prediction of machine tool, by minimizing numerical errors and the problems associated with convergence. Various experimntal dynamics and micro cutting tests are performed to verify the proposed methods. The fragility of micro tools would require the operation to be monitored to avoid excessive forces and vibrations that will significantly affect the overall paii and tool quality. In addition, the high rotational speeds represent high bandwidth requirements to measure micro cutting forces. In this thesis, a miniaturized milling system, and the accurate high bandwidth measurement of micro cutting forces using a 3-axis miniature force sen or and accelerometers are also developed in order to monitor the micro cutting forces accurately. The developed miniaturized milling system can fabricate micro parts with various engineering materials and micro tools within an 8 ?m resolution movement and an 80,000 rpm spindle speed. Since the inherent dynamics of the workpiece and overall machine tool affects the frequency bandwidth of sensors, the expanded Kalman filter is employed to compensate for unwanted dynamics by fusing the force sensor and accelerometer signals to increase the frequency bandwidth of the micro cutting forces measurement system.
Natural Supersymmetry: LHC, dark matter and ILC searches
Creators: name: Baer, Howard
name: Barger, Vernon
name: Huang, Peisi
name: Tata, Xerxes
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Particle physics models with Natural Supersymmetry are characterized by a superpotential parameter μ\sim m_h \sim125$ GeV, while third generation squarks have mass <0.5-1.5 TeV. Gluinos should be lighter than several TeV so as not to destabilize the lighter squarks. First and second generation sfermions can be at the tens-of-TeV level which yields a decoupling solution to the SUSY flavor and CP problems. Adopting a top-down approach, we delineate the range of GUT scale SUSY model parameters which leads to a Natural SUSY mass spectrum. We find natural SUSY models to be tightly constrained by the b-> sγbranching fraction measurement while it is also difficult but not impossible to accommodate a light Higgs scalar of mass ~125 GeV. We present several benchmark points which are expandable to slopes and planes. Natural SUSY is difficult to see at LHC unless some third generation squarks are very light. The top- and bottom- squarks cascade decay mainly to higgsino-like charginos and neutralinos via numerous possibilities, leading to a rather complex set of signatures. Meanwhile, a linear e^+e^- collider operating at \sqrt{s}\sim 0.25-0.5 TeV would be a higgsino factory and is essentially guaranteed a SUSY discovery of the low-lying charged and neutral higgsino states. Since thermal neutralino cold dark matter is underproduced, we conjecture that the incorporation of a Peccei-Quinn sector or light moduli into the theory will augment higgsino dark matter production, possibly together with an admixture of axions. We present rates for direct and indirect higgsino dark matter detection for the case where light higgsinos dominate the dark matter abundance.
description: 24 pages including 21 .eps figures
A curious polynomial interpolation of Carlitz-Riordan's q-ballot numbers
Creators: name: Chapoton, Frédéric
name: Zeng, Jiang
Publisher: name: Faculty of Science, University of Calgary
Year: 2015
Subjects: $q$-Catalan numbers; lattice paths; $q$-ballot numbers

description: We study a polynomial sequence $C_n(x|q)$ defined as a solution of a $q$-difference equation. This sequence, evaluated at $q$-integers, interpolates Carlitz--Riordan's $q$-ballot numbers. In the basis given by some kind of $q$-binomial coefficients, the coefficients are again some $q$-ballot numbers. We obtain another curious recurrence relation for these polynomials in a combinatorial way.
description: Contributions to Discrete Mathematics, Vol 10, No 1 (2015)
title: Requirement for PBAF in Transcriptional Repression and Repair at DNA Breaks in Actively Transcribed Regions of Chromatin
Creators: name: Kakarougkas, Andreas
name: Ismail, Amani
name: Chambers, Anna L.
name: Riballo, Enriqueta
name: Herbert, Alex D.
name: Künzel, Julia
name: Löbrich, Markus
name: Jeggo, Penny A.
name: Downs, Jessica A.
Publisher: name: Elsevier
Year: 2021

description: Actively transcribed regions of the genome are vulnerable to genomic instability. Recently, it was discovered that transcription is repressed in response to neighboring DNA double-strand breaks (DSBs). It is not known whether a failure to silence transcription flanking DSBs has any impact on DNA repair efficiency or whether chromatin remodelers contribute to the process. Here, we show that the PBAF remodeling complex is important for DSB-induced transcriptional silencing and promotes repair of a subset of DNA DSBs at early time points, which can be rescued by inhibiting transcription globally. An ATM phosphorylation site on BAF180, a PBAF subunit, is required for both processes. Furthermore, we find that subunits of the PRC1 and PRC2 polycomb group complexes are similarly required for DSB-induced silencing and promoting repair. Cancer-associated BAF180 mutants are unable to restore these functions, suggesting PBAF's role in repressing transcription near DSBs may contribute to its tumor suppressor activity.
Additional file 1 of Is OPRM1 genotype a valuable predictor of VAS in patients undergoing laparoscopic radical resection of colorectal cancer with fentanyl?
Creators: name: Zhou, Yan
name: Cao, Lei
name: Yang, Yihui
name: Gao, Yaoyi
name: Li, Yihao
name: Wang, Beili
name: Pan, Baishen
name: Huang, Jian
name: Guo, Wei
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Environmental Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Mental Health

description: Additional file 1.
On uniformly resolvable {K_2, P_k}-designs with with k=3,4
Creators: name: Gionfriddo, Mario
name: Milici, Salvatore
Publisher: name: Faculty of Science, University of Calgary
Year: 2015
Subjects: Resolvable graph decomposition; uniformly resolvable designs; paths

description: Given a collection of graphs H, a uniformly resolvable H-design of order v is a decomposition of the edges of K_v into isomorphic copies of graphs from H (also called blocks)  in such a way that all blocks in a given parallel class are isomorphic to the same graph from H. We consider the case H={K_2, P_k}  with k=3,4, and determine the spectrum completely.
description: Contributions to Discrete Mathematics, Vol 10, No 1 (2015)
Additional file 1 of Tricuspid annular plane systolic excursion/mitral annular plane systolic excursion ratio in critically ill patients: an index of right- and left-ventricular function mismatch and a risk factor for cardiogenic pulmonary edema
Creators: name: Zhang, Hongmin
name: Lian, Hui
name: Wang, Xiaoting
name: Zhang, Qing
name: Liu, Dawei
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: Immunology
subject: FOS: Clinical medicine
subject: Cancer
subject: Mental Health
subject: Hematology
subject: Virology

description: Supplementary Material 1: Echocardiographic and hemodynamic parameters of CPE patients with different ventricular function.
Chasing robbers on percolated random geometric graphs
Creators: name: Li, Anshui
name: Muller, Tobias
name: Pralat, Pawel
Publisher: name: Faculty of Science, University of Calgary
Year: 2015

description: In this paper, we study the vertex pursuit game of \emph{Cops and Robbers}, in which cops try to capture a robber on the vertices of a graph. The minimum number of cops required to win on a given graph $G$ is called the cop number of $G$.  We focus on $\G(n,r,p)$, a percolated random geometric graph in which $n$ vertices are chosen uniformly at random and independently from $[0,1]^2$, and two vertices are adjacent with probability $p$ if the Euclidean distance between them is at most $r$. We present asymptotic results for the game of Cops and Robber played on $\G(n,r,p)$ for a wide range of $p=p(n)$ and $r=r(n)$.
description: Contributions to Discrete Mathematics, Vol 10, No 1 (2015)
On the Usability of Authenticity Checks for Hardware Security Tokens
Creators: name: Pfeffer, Katharina
name: Mai, Alexandra
name: Dabrowski, Adrian
name: Gusenbauer, Matthias
name: Schindler, Philipp
name: Weippl, Edgar
name: Franz, Michael
name: Krombholz, Katharina
Publisher: name: CISPA
Year: 2023

description: The ultimate responsibility to verify whether a newly purchased hardware security token (HST) is authentic and unmodified lies with the end user. However, recently reported attacks on such tokens suggest that users cannot take the security guarantees of their HSTs for granted - even despite widely deployed authenticity checks. We present the first comprehensive market review evaluating the effectiveness and usability of authenticity checks for the most commonly used HSTs. Furthermore, we conducted a survey (n=194) to examine users’ perceptions and usage of these checks. We found that due to a lack of transparency and information, users often do not carry out - or are not aware of - essential checks but rely on less meaningful methods. Moreover, our results confirm that currently deployed authenticity checks cannot mitigate all variants of distribution attacks. Furthermore, some authenticity concepts of different manufacturers contradict each other. To address these challenges, we suggest a combination of already deployed and novel authenticity checks as well as a user-centered transparent design.
Optimal planning with approximate model-based reinforcement learning
Creators: name: Kao, Hai Feng
Publisher: name: University of British Columbia
Year: 2012

description: Model-based reinforcement learning methods make efficient use of samples by building a model of the environment and planning with it. Compared to model-free methods, they usually take fewer samples to converge to the optimal policy. Despite that efficiency, model-based methods may not learn the optimal policy due to structural modeling assumptions. In this thesis, we show that by combining model- based methods with hierarchically optimal recursive Q-learning (HORDQ) under a hierarchical reinforcement learning framework, the proposed approach learns the optimal policy even when the assumptions of the model are not all satisfied. The effectiveness of our approach is demonstrated with the Bus domain and Infinite Mario – a Java implementation of Nintendo’s Super Mario Brothers.
Junior Management Science, Bd. 8 Nr. 2 (2023)
Creators: name: Junior Management Science
Publisher: name: Junior Management Science
Year: 2023

description: Bilanzierung von Spielerwerten im deutschen Profi-Fußball – Ein kritischer Vergleich der handelsrechtlichen und IFRS-Rechnungslegung...505-531 Passive ownership and long-term orientation around the world...473-504 The glamorization of overwork - an empirical study of causes and perceptions of excessive work attitudes in the pursuit of managerial careers...358-403 Innovation Performance of Family and Founder Firms: Empirical Evidence from German Listed Companies...333-357 Ethical Problems in Family Firms...431-452 Visuelle Wirkung von Produktneuheiten: Die Rolle der Marke bei der Designanpassung...453-472 Winning when Going Global – On the Role of Heritage and Strategic Moves for Internationalization Endeavors of Start-ups...532-568 The Effect of Entrepreneurs’ Gender and Gendered Startup Fields on Organizational Attraction for Potential Applicants...312-332 Determinants and Capital Market Consequences of Net Zero Targets...404-430 The implementation of financial planning and cost accounting instruments in startups...270-311
Visibility-monotonic polygon deflation
Creators: name: Bose, Prosenjit
name: Dujmovic, Vida
name: Hoda, Nima
name: Morin, Pat
Publisher: name: Faculty of Science, University of Calgary
Year: 2015
Subjects: Polygons; reconfiguration; deflation

description: A deflated polygon is a polygon with no visibility crossings.  We answer a question posed by Devadoss et al. (2012) by presenting a  polygon that cannot be deformed via continuous visibility-decreasing  motion into a deflated polygon.  We show that the  least n for which there exists such an n-gon is seven.  In  order to demonstrate non-deflatability, we use a new combinatorial  structure for polygons, the directed dual, which encodes the  visibility properties of deflated polygons.  We also show that any  two deflated polygons with the same directed dual can be deformed,  one into the other, through a visibility-preserving deformation.
description: Contributions to Discrete Mathematics, Vol 10, No 1 (2015)
Ground-Water Mining in the United States
Creators: name: Sloggett, Gordon
name: Dickason, Clifford
name: Sloggett, Gordon
name: Dickason, Clifford
Publisher: name: Unknown
Year: 1986
Subjects: subject: Crop Production/Industries
subject: Farm Management
subject: Production Economics
subject: Resource /Energy Economics and Policy
subject: Irrigation
subject: ground-water mining
subject: ground-water management

description: Ground-water levels are declining from 6 inches to over 5 feet annually beneath 14 million acres of irrigated land in 11 States irrigated mainly by ground water. Pumping costs are rising, and well yields are declining, causing farmers to adjust their irrigation practices. Farmers are adopting new irrigation technologies to improve irrigation efficiency and are changing to crops with lower water requirements in some areas. However, techniques for conserving ground water may not extend the life of aquifers. State and local governments have passed laws severely restricting further irrigation development in about 45 percent of the irrigated area affected by ground-water mining.
Careful Who You Trust: Studying the Pitfalls of Cross-Origin Communication
Creators: name: Meiser, Gordon
name: Laperdrix, Pierre
name: Stock, Ben
Publisher: name: CISPA
Year: 2023

description: In the past, Web applications were mostly static and most of the content was provided by the site itself. Nowadays, they have turned into rich client-side experiences customized for the user where third parties supply a considerable amount of content, e.g., analytics, advertisements, or integration with social media platforms and external services. By default, any exchange of data between documents is governed by the Same-Origin Policy, which only permits to exchange data with other documents sharing the same protocol, host, and port. Given the move to a more interconnected Web, standard bodies and browser vendors have added new mechanisms to enable cross-origin communication, primarily domain relaxation, postMessages, and CORS. While prior work has already shown the pitfalls of not using these mechanisms securely (e.g., omitting origin checks for incoming postMessages), we instead focus on the increased attack surface created by the trust that is necessarily put into the communication partners. To that end, we report on a study of the Tranco Top 5,000 to measure the prevalence of cross-origin communication. By analyzing the interactions between sites, we build an interconnected graph of the trust relations necessary to run the Web. Subsequently, based on this graph, we estimate the damage that can be caused through real-world exploitability of existing client-side XSS flaws.
An inductive construction of $(2,1)$-tight graphs
Creators: name: Nixon, Anthony
name: Owen, John
Publisher: name: Faculty of Science, University of Calgary
Year: 2014

description: The graphs $G=(V,E)$ with $|E|=2|V|-\ell$ that satisfy $|E'|\leq 2|V'|-\ell$ for any subgraph $G'=(V',E')$ (and for $\ell=1,2,3$) are the $(2,\ell)$-tight graphs. The Henneberg--Laman theorem characterizes $(2,3)$-tight graphs inductively in terms of two simple moves, known as the Henneberg moves. Recently, this has been extended, via the addition of a graph extension move, to the case of $(2,2)$-tight simple graphs. Here an alternative characterization is provided by means of vertex-to-$K_4$ and edge-to-$K_3$ moves. This is extended to the $(2,1)$-tight simple graphs by the addition of an edge joining move.
description: Contributions to Discrete Mathematics, Vol 9, No 2 (2014)