17,449 research outputs found
Dynamic keystroke analysis using AR model
The design and development of a pressure sensor based typing biometrics authentication
system (BAS) is discussed in this paper. The dynamic keystroke, represented by its time
duration and force generates a waveform, which when concatenated results in a user's
typing pattern for the typed password. The design of the BAS is in two stages, whereby
the hardware comprising the pressure sensor and the associated data acquisition system
(DAS) is first implemented. The system DAS has been designed using LabVIEW
software. Furthermore several data preprocessing techniques have been used to improve
the quality of the acquired waveforms. The second stage involves a classifier to
authenticate the users. This paper discusses a new data classifier technique based on
autoregressive signal modeling (AR), which has been developed so as to correctly identify
and authenticate the users of the system. Some experiments have been conducted to
show the validity of the overall BAS performance. The results obtained have shown that
this proposed system is reliable with many potential applications for computer security
New "Square Root" Model of Lepton Family Cyclic Symmetry
Following the newly formulated notion of form invariance of the neutrino mass
matrix, a complete model of leptons is constructed. It is based on a specific
unitary 3 X 3 matrix U in family space, such that U^2 is the simple discrete
symmetry nu_e to -nu_e, nu_mu to nu_tau. Thus U also generates the cyclic group
Z_4. The charged-lepton mass matrix is nearly diagonal while the neutrino mass
matrix is of the form suitable for explaining maximal (large) mixing in
atmospheric (solar) neutrino oscillations in the context of three nearly
degenerate neutrino masses. Observable lepton flavor violation is predicted.
Quarks may be treated in the same way as the charged leptons.Comment: 10 pages, no figur
Penggunaan Sandwich Plate System (Sps) Pada Konstruksi Inner Bottom
Perkembangan teknologi yang semakin maju memberikan alternatif-alternatif dalam memperbaiki berbagai bentuk sistem, termasuk di dalamnya konstruksi struktur kapal. Latar belakang dari penelitian ini adalah pada permasalahan kebutuhan material ringan pada kapal, kecepatan proses produksi, penyederhanaan konstruksi dan biaya perawatan kapal yang rendah. Penggunaan material ringan Sandwich Plate System (SPS) menjadi salah satu jawaban dari permasalahan-permasalahan tersebut, penggunaan SPS dapat menyederhanakan bentuk dari konstruksi kapal dengan menghilangkan penegar inner bottom longitudinal dan mampu mengurangi Light Weight Tonnase (LWT). Artikel ini membahas perbandingan pola distribusi tegangan dan deformasi pada konstruksi bottom yang menggunakan SPS dan baja AH36, selain dari itu juga mengetahui seberapa besar pengurangan LWT yang dihasilkan untuk meningkatkan Payload kapal. Analisa dilakukan dengan simulasi numerik berdasarkan FEM pada konstruksi inner bottom dengan pembebanan muatan. Dari hasil simulasi didapatkan besar tegangan maksimal untuk material baja AH36 sebesar 226 Mpa dengan menggunakan penegar, sedangkan konstuksi dengan material SPS tegangan maksimal yang dihasilkan sebesar 221 Mpa tanpa penggunaan penegar, dengan deformasi maksimal untuk AH36 dan SPS yaitu 77 mm yang terjadi pada bagian tengah blok konstruksi inner bottom. Dengan hilangnya penegar berat konstruksi berkurang sebesar 13,05% dari penggunaan material baja AH36 sehingga memberikan peningkatan payload sebesar 13,05%. Simulasi penelitian dilakukan pada kapal Bulk Carrier (BC)
Leptogenesis via multiscalar coherent evolution with supersymmetric neutrino see-saw
A novel scenario of leptogenesis is investigated in the supersymmetric
neutrino see-saw model. The right-handed sneutrino and the field in the direction of the slepton and Higgs
doublets start together coherent evolution after the inflation with
right-handed neutrino mass smaller than the Hubble parameter of
inflation. Then, after some period the motion of and is
drastically changed by the cross coupling
from the and terms, and the significant
asymmetries of and are generated. The asymmetry is fixed later by the thermal effect as the lepton number
asymmetry for baryogenesis, while the asymmetry disappears
through the decays with almost the same rate but opposite final lepton numbers.Comment: 4pages, 1 figure; submitted to Physical Review D. The renormalization
group effects were include
Defining the user role in infection control
Health policy initiatives continue to recognize the valuable role of patients and the public in improving safety, advocating the availability of information as well as involvement at the point of care. In infection control, there is a limited understanding of how users interpret the plethora of publicly available information about hospital performance, and little evidence to support strategies that include reminding healthcare staff to adhere to hand hygiene practices
The bonded macro fiber composite (MFC) and woven kenaf effect analyses on the micro energy harvester performance of kenaf plate using modal testing and Taguchi method
The demand on wind energy application will continue to increase as fossil fuel prices keep increasing and the reservoir keeps decreasing. In wind energy, wind turbine application should be properly selected. The material selection for turbine blade fabrication is highlighted as well in recent research. For green material application, the usage of natural fiber reinforced composite, especially kenaf fiber, in the fabrication of wind turbines needs to be given due attention. Woven and unwoven kenaf fiber is employed to fabricate composite plates which replicate the simple turbine blade model. At the same time, Macro Fiber Composite (MFC) is attached to the kenaf plates for micro energy harvester purposes. There are two methods to attach the MFC used in this study which are surface bonded and embedding into the plate. In order to investigate the effects of bonding MFC technique, modal Testing analysis and Taguchi method is employed. It is found out that the damping percentage of both woven and unwoven kenaf plates increase at 100 % and 50 % respectively when bonded with MFC on their surfaces. Bonded technique is suggested as the most influenced factor in micro energy harvesting at the vibration range of 20 to 60 Hz. It summarized that, the kenaf woven type, the distance from structure neutral axis, the stiffness of structure, the excitation vibration and the neutral frequency of a structure are highlighted as the factors influencing the performance of micro energy harvester as well
Electron-capture branch of 100Tc and tests of nuclear wave functions for double-beta decays
We present a measurement of the electron-capture branch of Tc. Our
value, , implies that the
Mo neutrino absorption cross section to the ground state of Tc
is roughly one third larger than previously thought. Compared to previous
measurements, our value of prevents a smaller disagreement with
QRPA calculations relevant to double- decay matrix elements
The bonded macro fiber composite (MFC) and woven kenaf effect analyses on the micro energy harvester performance of kenaf plate using modal testing and Taguchi method
The demand on wind energy application will continue to increase as fossil fuel prices keep increasing and the reservoir keeps decreasing. In wind energy, wind turbine application should be properly selected. The material selection for turbine blade fabrication is highlighted as well in recent research. For green material application, the usage of natural fiber reinforced composite, especially kenaf fiber, in the fabrication of wind turbines needs to be given due attention. Woven and unwoven kenaf fiber is employed to fabricate composite plates which replicate the simple turbine blade model. At the same time, Macro Fiber Composite (MFC) is attached to the kenaf plates for micro energy harvester purposes. There are two methods to attach the MFC used in this study which are surface bonded and embedding into the plate. In order to investigate the effects of bonding MFC technique, modal Testing analysis and Taguchi method is employed. It is found out that the damping percentage of both woven and unwoven kenaf plates increase at 100 % and 50 % respectively when bonded with MFC on their surfaces. Bonded technique is suggested as the most influenced factor in micro energy harvesting at the vibration range of 20 to 60 Hz. It summarized that, the kenaf woven type, the distance from structure neutral axis, the stiffness of structure, the excitation vibration and the neutral frequency of a structure are highlighted as the factors influencing the performance of micro energy harvester as well
A Comparison of Consistent Discretizations for Elliptic Problems on Polyhedral Grids
In this work, we review a set of consistent discretizations for second-order elliptic equations, and compare and contrast them with respect to accuracy, monotonicity, and factors affecting their computational cost (degrees of freedom, sparsity, and condition numbers). Our comparisons include the linear and nonlinear TPFA method, multipoint flux-approximation (MPFA-O), mimetic methods, and virtual element methods. We focus on incompressible flow and study the effects of deformed cell geometries and anisotropic permeability.acceptedVersio
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