736 research outputs found
Co-emergence of Institutional Innovation Navigates the New Normal in Growing Economies
Increasing fear of the global simultaneous stagnation derived from the Euro-crisis together with the New Normal in growing economies reveals the limit of individual strength leading to the significance of fusion with global best practices. Dramatic advancement of the Internet has enabled consumers in any nation to choose and learn from world’s strongest suppliers. Both trends inevitably necessitate co-emergence of institutional innovation between suppliers and consumers for sustainability. On the basis of an empirical analysis comparing institutional systems in 100 nations, this paper demonstrates the significance of this co-emergence thereby navigating the New Normal in growing economies
Adverse event detection by integrating twitter data and VAERS
Background: Vaccinehasbeenoneofthemostsuccessfulpublichealthinterventionstodate.However,vaccines are pharmaceutical products that carry risks so that many adverse events (AEs) are reported after receiving vaccines. Traditional adverse event reporting systems suffer from several crucial challenges including poor timeliness. This motivates increasing social media-based detection systems, which demonstrate successful capability to capture timely and prevalent disease information. Despite these advantages, social media-based AE detection suffers from serious challenges such as labor-intensive labeling and class imbalance of the training data.
Results: Totacklebothchallengesfromtraditionalreportingsystemsandsocialmedia,weexploittheircomplementary strength and develop a combinatorial classification approach by integrating Twitter data and the Vaccine Adverse Event Reporting System (VAERS) information aiming to identify potential AEs after influenza vaccine. Specifically, we combine formal reports which have accurately predefined labels with social media data to reduce the cost of manual labeling; in order to combat the class imbalance problem, a max-rule based multi-instance learning method is proposed to bias positive users. Various experiments were conducted to validate our model compared with other baselines. We observed that (1) multi-instance learning methods outperformed baselines when only Twitter data were used; (2) formal reports helped improve the performance metrics of our multi-instance learning methods consistently while affecting the performance of other baselines negatively; (3) the effect of formal reports was more obvious when the training size was smaller. Case studies show that our model labeled users and tweets accurately.
Conclusions: WehavedevelopedaframeworktodetectvaccineAEsbycombiningformalreportswithsocialmedia data. We demonstrate the power of formal reports on the performance improvement of AE detection when the amount of social media data was small. Various experiments and case studies show the effectiveness of our model
Energy entanglement in neutron interferometry
Entanglement between degrees of freedom, namely between the spin, path and
(total) energy degrees of freedom, for single neutrons is exploited. We
implemented a triply entangled Greenberger-Horne-Zeilinger(GHZ)-like state and
coherently manipulated relative phases of two-level quantum subsystems. An
inequality derived by Mermin was applied to analyze the generated GHZ-like
state: we determined the four expectation values and finally obtained M=2.558
+/- 0.004 which is clearly above the threshold of 2. This demonstrates the
violation of a Mermin-like inequality for triply entangled GHZ-like state in a
single-particle system, which, in turn, exhibits a clear inconsistency between
noncontextual assumptions and quantum mechanics and confirms quantum
contextuality.Comment: 4 pages, 3 figure
High-speed scanless entire bandwidth mid-infrared chemical imaging
Mid-infrared spectroscopy probes molecular vibrations to identify chemical
species and functional groups. Therefore, mid-infrared hyperspectral imaging is
one of the most powerful and promising candidates for chemical imaging using
optical methods. Yet high-speed and entire bandwidth mid-infrared hyperspectral
imaging has not been realized. Here we report a mid-infrared hyperspectral
chemical imaging technique that uses chirped pulse upconversion of sub-cycle
pulses at the image plane. This technique offers a lateral resolution of 15
m, and the field of view is adjustable between 800 m 600
m to 12 mm 9 mm. The hyperspectral imaging produces a 640
480 pixel image in 8 s, which covers a spectral range of 640-3015
cm, comprising 1069 wavelength points and offering a wavenumber
resolution of 2.6-3.7 cm. For discrete frequency mid-infrared imaging,
the measurement speed reaches a frame rate of 5 kHz, the repetition rate of the
laser. As a demonstration, we effectively identified and mapped different
components in a microfluidic device, plant cell, and mouse embryo section. The
great capacity and latent force of this technique in chemical imaging promise
to be applied to many fields such as chemical analysis, biology, and medicine.Comment: 22 pages, 10 figure
Temperature Dependent Low-Frequency Noise Characteristics of NiO/GaO p-n Heterojunction Diodes
We report on the temperature dependence of the low-frequency electronic noise
in NiO/GaO p-n heterojunction diodes. The noise spectral density is
of the 1/f-type near room temperature but shows signatures of Lorentzian
components at elevated temperatures and at higher current levels (f is the
frequency). We observed an intriguing non-monotonic dependence of the noise on
temperature near T = 380 K. The Raman spectroscopy of the device
structure suggests material changes, which results in reduced noise above this
temperature. The normalized noise spectral density in such diodes was
determined to be on the order of 10 cm/Hz (f = 10 Hz) at 0.1
A/cm current density. In terms of the noise level, NiO/GaO p-n
diodes occupy an intermediate position among devices of various designs
implemented with different ultra-wide-band-gap (UWBG) semiconductors. The
obtained results are important for understanding the electronic properties of
the UWBG heterojunctions and contribute to the development of noise
spectroscopy as the quality assessment tool for new electronic materials and
device technologies.Comment: 18 pages, 6 figure
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