Design and implementation of web-based keystroke analytics for user verification

Keystroke analytics is the study of the way in which a user types rather than simply what they are typing. Through the application of statistical or machine learning methods the gathered biometric data may be used to verify the identity of a user, based on their typing style. This project aims to explore the field of keystroke analytics to gain an understanding of the methods involved and as such detail the implementation process for such a system’s design and implementation in a web-based context. Details regarding the technical design and implementation are specifically highlighted as current literature often does not describe how the systems shown were developed by rather the theory and methods used by them. The use of JavaScript to gather typing characteristic data is explored and the process of extracting useful features illustrated. Additionally both PHP and MySQL and used to create the backbone infrastructure to process and store the typing data. A phased development approach has been employed, with the overall system being separated into a collection of subsystems which are designed, implemented and tested before combining them to form the overall system. The supplementary software system requirements are presented, including the process of setting up a system capable of both being used to perform research on a local system as well as expand to online users for the data collection process. Method of testing the performance of a keystroke analytics system are discussed with potential changes to improve performance and minimise problems encountered outlined. The project was successful in that a working proof-of-concept web-based keystroke verification system was designed and implemented which yielded promising results for the data tested (FAR: 0%, FRR: 3.33%). Although to fully evaluate the system’s performance further testing needs to take place for a larger sample size of participants. The results obtained show that a keystroke analytics system may be implemented in a web-based environment, with relatively simple statistical methods, and provide reasonable performance results with only minor additional interaction required by the end-user. This has shown that keystroke analytics is a valid and well-performing method of providing non-intrusive multifactor authentication to traditional login systems

Confronting deep uncertainty in the forest carbon industry

Global momentum on carbon markets has the potential to direct substantial capital toward protecting the world’s forests. Yet the billion-dollar forest-carbon-offsetting industry is attracting criticism, in part from doubts about the methods used to measure and causally attribute changes in tree cover and biomass (1). Many actors in the industry are thus pursuing increasingly detailed measurement and monitoring of carbon outcomes and risks, under the assumption that this will improve accuracy and offset integrity (2). However, mounting scientific evidence (3, 4) implies that many forest landscapes are subject to “deep uncertainty” (5), such that claims of high accuracy in assessing carbon change are likely to remain inherently contestable, regardless of the technology or methodology deployed. Further, demands for such accuracy are likely to perpetuate inefficiencies and injustices among carbon suppliers (6–9). Approaches from other sectors may offer alternative ways forward in the absence of highly accurate measurements of outcomes

Operation of kinetic-inductance travelling wave parametric amplifiers at millimetre wavelengths

It is expected that the operation of microwave Kinetic Inductance Travelling Wave Parametric Amplifiers (KITWPAs) can be extended to the millimetre (mm) and the sub-mm wavelength range as long as the frequency is below the gap frequency of the superconducting film. This paper presents possible mm-wave designs for KITWPAs based on microstrip transmission lines. Our device is designed based on the BCS (Bardeen-Cooper-Schrieffer) model which successfully reproduces the measured transmission profile, gain, bandwidth, and nonlinear response of a fabricated KITWPA operating in the Ka-band, and includes the millimetre-wave dielectric loss determined by fitting the quality factor of a Wband microstrip resonator. We suggest a layout for a KITWPA operating near 220 GHz that can be fabricated using the same superconducting properties as the Ka-band device and can be coupled to a waveguide system. We conclude the paper by extending the 220 GHz design to higher frequency regimes approaching 1 THz

Unusual Nucleophilic Addition of Grignard Reagents in the Synthesis of 4-Amino-pyrimidines

Pyrimidines have always received considerable attention because of their importance in synthesis and elucidation of biochemical roles, in particular that of vitamin B1. Herein, we describe a reaction pathway in a Grignard reagent-based synthesis of substituted pyrimidines. A general synthesis of α-keto-2-methyl-4-amino pyrimidines and their C6-substituted analogues from 4-amino-5-cyano-2-methylpyrimidine is reported. The presence of the nitrile substituent in the starting material also results in an unusual reaction pathway leading to C6-substituted 1,2-dihydropyrimidines. Grignard reagents that give normal pyrimidine products under standard reaction conditions can be 14 switched to give dihydropyrimidines by holding the reaction at 0 °C before quenching

Voice of the Clinician: the case of an Australian health system.

Purpose The Voice of the Clinician project commenced during an era when practitioner burnout, dissatisfaction, and turnover became an increasingly global health workforce concern. One key problem is clinical staff not being empowered to voice their concerns to decision-makers, as was found in this case study of an Australian public health organization. The following research question informed the present study: What is a better committee system for clinician engagement in decision-making processes? The paper aims to discuss this issue. Design/methodology/approach The Mid North Coast Local Health District in New South Wales aspired to improve engagement between frontline clinicians and decision-makers. Social network analysis methods and mathematical modeling were used in the discovery of how committees are connected to each other and subsequently to other committee members. Findings This effort uncovered a hidden organizational architecture of 323 committees of 926 members which overall cost 84,729 person hours and AUD$2.923 million per annum. Furthermore, frontline clinicians were located far from centers of influence, just 37 percent of committees had terms of reference, and clinicians reported that meeting agendas were not being met. Practical implications In response to the findings, a technological platform was created so that the board of directors could visually see all the committees and the connections between them, thus creating ways to further improve communication, transparency of process, and - ultimately - clinician engagement. Originality/value The breakthrough idea is that all organizational meetings can be seen as a system of engagement and should be analyzed to determine and describe the points and pathways where clinician voice is blocked

Leaf trichomes affect caterpillar feeding in an instar-specific manner

Leaf trichomes play well-established roles in defense against insect herbivores, both as a physical barrier that impedes herbivore movement and by mediating chemical defenses. However, little work has examined how different trichome types influence herbivory by herbivores at different stages of development. We examined whether caterpillar instar and trichome type (glandular or non-glandular) affected the ability of the specialist herbivore caterpillar Manduca sexta to initiate feeding on 11 Solanaceous species exhibiting variation in the density and type of leaf trichomes. Our results suggest that non-glandular trichomes are far more effective than glandular trichomes in deterring the initiation of feeding by first- and second-instar caterpillars. Meanwhile, neither glandular nor non-glandular trichomes significantly affected the ability of third-instar caterpillars to commence feeding. These findings suggest that while non-glandular trichomes deter feeding initiation by early instar caterpillars, the contribution of both trichomes on later instars may depend on effects after feeding initiation

Exact sampling from non-attractive distributions using summary states

Propp and Wilson's method of coupling from the past allows one to efficiently generate exact samples from attractive statistical distributions (e.g., the ferromagnetic Ising model). This method may be generalized to non-attractive distributions by the use of summary states, as first described by Huber. Using this method, we present exact samples from a frustrated antiferromagnetic triangular Ising model and the antiferromagnetic q=3 Potts model. We discuss the advantages and limitations of the method of summary states for practical sampling, paying particular attention to the slowing down of the algorithm at low temperature. In particular, we show that such a slowing down can occur in the absence of a physical phase transition.Comment: 5 pages, 6 EPS figures, REVTeX; additional information at http://wol.ra.phy.cam.ac.uk/mackay/exac

Validity and Reliability of the Perceived Readiness for Discharge After Birth Scale

Objective: To assess the psychometric properties of a scale measuring mothers’ perceptions of readiness for discharge after birth. Design: Psychometric analyses including construct validity using factor analysis and known groups comparisons, predictive validity, and reliability. Data were collected at discharge and 6 weeks postdischarge. Setting: Tertiary-level perinatal center in the Midwestern United States. Participants: 1,462 postpartum mothers. Intervention: None. Main Outcome Measures: Perceived Readiness for Discharge After Birth Scale scores; subscale scores for personal status and knowledge factors.\u27 Results: Exploratory and confirmatory factor analyses indicated that the scale contained two factors. Perceived Readiness for Discharge After Birth Scale scores were lower for mothers who were breast-feeding, married, primiparous, and had a short hospital stay (less than 30 hours) than for their comparison groups. The Perceived Readiness for Discharge After Birth Scale personal status factor was predictive of self-reported physical and psychosocial problems and unscheduled utilization of health services in the first 6 weeks postpartum. The knowledge factor was predictive of postdischarge telephone calls to the pediatric provider. Reliability estimates ranged from 0.83 to 0.89 for the total scale and subscales. Conclusions: The Perceived Readiness for Discharge After Birth Scale performed well in psychometric testing. Assessing mothers’perceptions of readiness for discharge is important for measuring outcomes of hospitalization and for identifying mothers at risk for postdischarge problems