2,484 research outputs found
Composite Correlation Quantization for Efficient Multimodal Retrieval
Efficient similarity retrieval from large-scale multimodal database is
pervasive in modern search engines and social networks. To support queries
across content modalities, the system should enable cross-modal correlation and
computation-efficient indexing. While hashing methods have shown great
potential in achieving this goal, current attempts generally fail to learn
isomorphic hash codes in a seamless scheme, that is, they embed multiple
modalities in a continuous isomorphic space and separately threshold embeddings
into binary codes, which incurs substantial loss of retrieval accuracy. In this
paper, we approach seamless multimodal hashing by proposing a novel Composite
Correlation Quantization (CCQ) model. Specifically, CCQ jointly finds
correlation-maximal mappings that transform different modalities into
isomorphic latent space, and learns composite quantizers that convert the
isomorphic latent features into compact binary codes. An optimization framework
is devised to preserve both intra-modal similarity and inter-modal correlation
through minimizing both reconstruction and quantization errors, which can be
trained from both paired and partially paired data in linear time. A
comprehensive set of experiments clearly show the superior effectiveness and
efficiency of CCQ against the state of the art hashing methods for both
unimodal and cross-modal retrieval
Tidal capture of an asteroid by a magnetar: FRB-like bursts, glitch and anti-glitch
Recently, remarkable anti-glitch and glitch accompanied by bright radio
bursts of the Galactic magnetar SGR J1935+2154 were discovered. These two
infrequent temporal coincidences between the glitch/anti-glitch and the fast
radio burst (FRB)-like bursts reveal their physical connection of them. Here we
propose that the anti-glitch/glitch and FRB-like bursts can be well understood
by an asteroid tidally captured by a magnetar. In this model, an asteroid is
tidally captured and disrupted by a magnetar. Then, the disrupted asteroid will
transfer the angular momentum to the magnetar producing a sudden change in the
magnetar rotational frequency at the magnetosphere radius. If the orbital
angular momentum of the asteroid is parallel (or anti-parallel) to that of the
spinning magnetar, a glitch (or anti-glitch) will occur. Subsequently, the
bound asteroid materials fall back to the pericenter and eventually are
accreted to the surface of the magnetar. Massive fragments of the asteroid
cross magnetic field lines and produce bright radio bursts through coherent
curvature radiation. Our model can explain the sudden magnetar spin changes and
FRB-like bursts in a unified way.Comment: 6 pages, 1 figure, published by MNRAS
https://doi.org/10.1093/mnras/stad158
Anti-tumor activity of triterpenoid-rich extract from bamboo shavings (Caulis bamfusae in Taeniam)
Bamboo shavings are a kind of Chinese traditional medicine, which have been certificated as a material of functional food by the Ministry of Health in China. The anti-tumor activities of a triterpenoid-rich extract of bamboo shavings (EBS) and its main component, friedelin were evaluated in the present study. It was proved that EBS could inhibit the growth of P388 and A549 cancer cell lines effectively by SRB and MTT assay. Meanwhile, EBS had notable inhibitory effect on the sarcoma-loaded mice S180 model, which led to a depressed trend of tumor weight, compared to cyclophosphamide. Furthermore, the anti-tumor activity of friedelin monomer, a main triterpenoid separated from EBS, was tested by MTT assay and results showed that friedelin displayed rather strong anti-tumor activities on the proliferation of four cancer lines, A375, L929, Hela and THP-1, with a time-dose relationship compared to de-methylcantharidin, respectively. Therefore, it is suggested that EBS has a great potential to be applied in functional food for its anti-tumor activity, in which friedelin was one of the most important active factors.Key words: Extract of bamboo shavings, anti-tumor, friedelin, triterpenoid (Caulis bamfusae in Taeniam)
The separability of tripartite Gaussian state with amplification and amplitude damping
Tripartite three mode Gaussian state undergoes parametric amplification and
amplitude damping as well as thermal noise is studied. In the case of a state
totally symmetrically interacting with the environment, the time dependent
correlation matrix of the state in evolution is given. The conditions for fully
separability and fully entanglement of the final tripartite three mode Gaussian
state are worked out.Comment: 9 pages, 3 figure
Experimental Decoy Quantum Key Distribution Up To 130KM Fiber
Decoy State Quantum Key Distribution (QKD), being capable of beating PNS
attack and uncon- ditionally secure, have become an attractive one recently.
But, in many QKD systems, disturbances of transmission channel make quantum bit
error rate (QBER) increase which limits both security distance and key bit rate
of real-life decoy state QKD systems. We demonstrate the two-intensity decoy
QKD with one-way Faraday-Michelson phase modulation system, which is free of
channel dis- turbance and keeps interference fringe visibility (99%) long
period, near 130KM single mode optical fiber in telecom (1550 nm) wavelength.
This is longest distance fiber decoy state QKD system based on two intensity
protocol.Comment: 4 pages, 2figure
The Effects of the interfacial Pseudo-spin Coupling Fluctuation on the Dielectric Property of a Ferroelectric Superlattice
Using effective-field theory with correlations, we investigate the effects of
interfacial pseudo-spin coupling fluctuations on the susceptibility and
polarization of ferroelectric superlattices within the framework of transverse
Ising model. It is found that the interfacial coupling fluctuations increase
the susceptibility in the low temperature region. For a strong interfacial
coupling, the phase transition temperature decreases with the strength of
fluctuations of the interfacial coupling. The dependence of the susceptibility
on the superlattice period of are plotted for different
interfacial coupling fluctuations strength. At room temperature, when the
interfacial coupling fluctuation increases, the peak position of the
susceptibility will shift to a large superlattice period.Comment: 14 pages, 5 figures, RevTex
Redactable Signatures for Signed CDA Documents
[[abstract]]The Clinical Document Architecture, introduced
by Health Level Seven, is a XML-based standard intending
to specify the encoding, structure, and semantics of clinical
documents for exchange. Since the clinical document is in
XML form, its authenticity and integrity could be guaranteed
by the use of the XML signature published by W3C.
While a clinical document wants to conceal some personal
or private information, the document needs to be redacted.
It makes the signed signature of the original clinical
document not be verified. The redactable signature is thus
proposed to enable verification for the redacted document.
Only a little research does the implementation of the
redactable signature, and there still not exists an appropriate
scheme for the clinical document. This paper will investigate
the existing web-technologies and find a compact and
applicable model to implement a suitable redactable
signature for the clinical document viewer.[[notice]]補正完畢[[incitationindex]]SC
- …