15,012 research outputs found
Fluctuation and localization of acoustic waves in bubbly water
Here the fluctuation properties of acoustic localization in bubbly water is
explored. We show that the strong localization can occur in such a system for a
certain frequency range and sufficient filling fractions of air-bubbles. Two
fluctuating quantities are considered, that is, the fluctuation of transmission
and the fluctuation of the phase of acoustic wave fields. When localization
occurs, these fluctuations tend to vanish, a feature able to uniquely identify
the phenomenon of wave localization.Comment: 10 pages, 4 figure
Teleportation and Dense Coding with Genuine Multipartite Entanglement
We present an explicit protocol for faithfully teleporting an
arbitrary two-qubit state via a genunie four-qubit entangled state. By
construction, our four-partite state is not reducible to a pair of Bell states.
Its properties are compared and contrasted with those of the four-party GHZ and
W states. We also give a dense coding scheme involving our state
as a shared resource of entanglement. Both and
indicate that our four-qubit state is a likely candidate for the genunine
four-partite analogue to a Bell state.Comment: 9 pages, 0 figur
Towards Secure Blockchain-enabled Internet of Vehicles: Optimizing Consensus Management Using Reputation and Contract Theory
In Internet of Vehicles (IoV), data sharing among vehicles is essential to
improve driving safety and enhance vehicular services. To ensure data sharing
security and traceability, highefficiency Delegated Proof-of-Stake consensus
scheme as a hard security solution is utilized to establish blockchain-enabled
IoV (BIoV). However, as miners are selected from miner candidates by
stake-based voting, it is difficult to defend against voting collusion between
the candidates and compromised high-stake vehicles, which introduces serious
security challenges to the BIoV. To address such challenges, we propose a soft
security enhancement solution including two stages: (i) miner selection and
(ii) block verification. In the first stage, a reputation-based voting scheme
for the blockchain is proposed to ensure secure miner selection. This scheme
evaluates candidates' reputation by using both historical interactions and
recommended opinions from other vehicles. The candidates with high reputation
are selected to be active miners and standby miners. In the second stage, to
prevent internal collusion among the active miners, a newly generated block is
further verified and audited by the standby miners. To incentivize the standby
miners to participate in block verification, we formulate interactions between
the active miners and the standby miners by using contract theory, which takes
block verification security and delay into consideration. Numerical results
based on a real-world dataset indicate that our schemes are secure and
efficient for data sharing in BIoV.Comment: 12 pages, submitted for possible journal publicatio
The Evolved Survival of SM Entertainment in the Chinese Market: Legitimation Strategies and Organizational Survival
AVEX, a Japanese leading entertainment company, decided to withdraw from the Chinese market in 2013 due to its business failure. In contrast, SM Entertainment adapted to the Chinese market and has survived. Organizations are affected by their external environment and implement strategies to adapt and respond to this environment. This study investigates reasons for SM Entertainment’s successful entry into China. We analyze how the corporation’s strategies evolved to acclimatize to changes in the Chinese cultural industry policy from 1998 to 2014, and explored the results of these strategies. From this analysis, we argue that it is important for organizations to tailor their response strategies to changing external environments in order to acquire social support
Deconfinement Phase Transition Heating and Thermal Evolution of Neutron Stars
The deconfinement phase transition will lead to the release of latent heat
during spins down of neutron stars if the transition is the first-order one.We
have investigated the thermal evolution of neutron stars undergoing such
deconfinement phase transition. The results show that neutron stars may be
heated to higher temperature.This feature could be particularly interesting for
high temperature of low-magnetic field millisecond pulsar at late stage.Comment: 4 pages, to be published by American Institute of Physics, ed. D.Lai,
X.D.Li and Y.F.Yuan, as the Proceedings of the conference Astrophysics of
Compact Object
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