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Changepoint detection methods are used in many areas of science and engineering, for example, in the analysis of copy number variation data to detect abnormalities in copy numbers along the genome. Despite the broad array of available tools, methodology for quantifying our uncertainty in the strength (or the presence) of given changepoints post‐selection are lacking. Post‐selection inference offers...
Accurate forecasts could enable more informed public health decisions. Since 2013, CDC has worked with external researchers to improve influenza forecasts by coordinating seasonal challenges for the United States and the 10 Health and Human Service Regions. Forecasted targets for the 2014–15 challenge were the onset week, peak week, and peak intensity of the season and the weekly percent of outpatient...
Secure data dissemination is indispensable in various network systems such as wireless sensor networks (WSNs) and Information-Centric Networks. Several approaches have been proposed for secure data dissemination while adopting forward error correction techniques (e.g., erasure codes) for efficiency. In particular, an approach named LR-Seluge was proposed to achieve efficient, secure data dissemination...
Femtosecond pulse lasers provide novel possibilities to high-precision optical profilometry for quality assurance of step-structures on 3D microelectronic products based on its time and frequency domain characteristics.
We demonstrate an all-fiber-based multi-channel fiber laser referenced to the frequency comb. Three sample optical frequencies were generated within telecommunication band with a frequency stability of 2.24×10−12 and a linewidth less than 30 kHz.
Precision measurement of large-stepped surface profiles is demonstrated using the frequency comb of a femtosecond pulse laser. Four optical wavelengths are selected out of the frequency comb to realize the principle of multi-wavelength interferometry with traceability to the Rb atomic clock of time/frequency standard. A large step-height of ∼70 μm is exemplarily measured with nanometre precision with...
This paper presents the design of a channel migration scheme to mitigate wireless jamming attacks. By exploiting the multiple wireless channels typically available on most wireless platforms, our scheme uses a flexible and resilient approach to switch communication channels, which enables wireless nodes to continue communication with their neighbors in the presence of jamming attacks. A nice property...
We demonstrate an all-fiber-based apparatus built to generate near-infrared frequencies directly from an Er-doped fiber frequency comb. The amplified final output signal yields a frequency stability of 2×10−15 with a linewidth less than 1 Hz.
The optical frequency generator built using the optical comb of a femtosecond laser enables absolute distance measurements with sub-wavelength precision by performing multi-wavelength interferometry. This method will benefit precise manufacture of large objects and also future space missions.
The frequency comb of a femtosecond laser is exploited as the wavelength ruler for length metrology. This permits absolute distances to be precisely measured with uncertainty directly traceable to the atomic clock of time standard.
The frequency comb of a femtosecond laser is exploited as the wavelength ruler for length metrology. This permits absolute distances to be precisely measured with uncertainty directly traceable to the atomic clock of time standard.
Wireless sensor networks are considered ideal candidates for a wide range of applications, such as industry monitoring, data acquisition in hazardous environments, and military operations. It is desirable and sometimes necessary to reprogram sensor nodes through wireless links after deployment, due to, for example, the need of removing bugs and adding new functionalities. The process of propagating...
The frequency comb of a femtosecond laser is exploited as the wavelength ruler for length metrology. This permits absolute distances to be precisely measured with uncertainty directly traceable to the atomic clock of time standard.
Emerging possibilities for advanced optical metrology using the optical frequency synthesizer are addressed with emphasis on absolute distance measurements. The synthesizer is constructed by tuning an external cavity laser diode to the optical comb of a femtosecond pulse laser, which encompasses monochromatic laser lines evenly spaced over a wide spectral range.
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