2,269 research outputs found
Cournot Competition Yields Spatial Avoiding Competition in Groups
This paper characterizes the properties of equilibrium location patterns in an Anderson-Neven-Pal model and uses these characteristics to comprehensively find the subgame perfect Nash equilibria, most of which are not yet found in the literature. Since the external competition effect may be exactly canceled out, or internal competition strictly dominates external competition, or the internal competition effect is consistent with the external competition effect, therefore without any externality and prior collusion, a competitive group structure may form endogenously in equilibrium and firms tend to avoid competition inside each group. The analyses of an Anderson-Neven-Pal model are instructive in studying the conditions for a capacity to implement a ``Nash combination."Cournot competition; Spatial competition; Nash equilibrium
Distributed Indexing Schemes for k-Dominant Skyline Analytics on Uncertain Edge-IoT Data
Skyline queries typically search a Pareto-optimal set from a given data set
to solve the corresponding multiobjective optimization problem. As the number
of criteria increases, the skyline presumes excessive data items, which yield a
meaningless result. To address this curse of dimensionality, we proposed a
k-dominant skyline in which the number of skyline members was reduced by
relaxing the restriction on the number of dimensions, considering the
uncertainty of data. Specifically, each data item was associated with a
probability of appearance, which represented the probability of becoming a
member of the k-dominant skyline. As data items appear continuously in data
streams, the corresponding k-dominant skyline may vary with time. Therefore, an
effective and rapid mechanism of updating the k-dominant skyline becomes
crucial. Herein, we proposed two time-efficient schemes, Middle Indexing (MI)
and All Indexing (AI), for k-dominant skyline in distributed edge-computing
environments, where irrelevant data items can be effectively excluded from the
compute to reduce the processing duration. Furthermore, the proposed schemes
were validated with extensive experimental simulations. The experimental
results demonstrated that the proposed MI and AI schemes reduced the
computation time by approximately 13% and 56%, respectively, compared with the
existing method.Comment: 13 pages, 8 figures, 12 tables, to appear in IEEE Transactions on
Emerging Topics in Computin
Inhibition of stimulated Raman scattering due to the excitation of stimulated Brillouin scattering
The nonlinear coupling between stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) of intense laser in underdense plasma is studied theoretically and numerically. Based upon the fluid model, their coupling equations are derived, and a threshold condition of plasma density perturbations due to SBS for the inhibition of SRS is given. Particle-in-cell simulations show that this condition can be achieved easily by SBS in the so-called fluid regime with kLλD<0.15, where kL is the Langmuir wave number and λD is the Debye length [Kline et al., Phys. Plasmas 13, 055906 (2006)]. SBS can reduce the saturation level of SRS and the temperature of electrons in both homogeneous and inhomogeneous plasma. Numerical simulations also show that this reduced SRS saturation is retained even if the fluid regime condition mentioned above is violated at a later time due to plasma heating
Personal Exposure to Submicrometer Particles and Heart Rate Variability in Human Subjects
We conducted a study on two panels of human subjects—9 young adults and 10 elderly patients with lung function impairments—to evaluate whether submicrometer particulate air pollution was associated with heart rate variability (HRV). We measured these subjects’ electrocardiography and personal exposure to number concentrations of submicrometer particles with a size range of 0.02–1 μm (NC(0.02–1)) continuously during daytime periods. We used linear mixed-effects models to estimate the relationship between NC(0.02–1) and log(10)-transformed HRV, including standard deviation of all normal-to-normal intervals (SDNN), square root of the mean of the sum of the squares of differences between adjacent NN intervals (r-MSSD), low frequency (LF, 0.04–0.15 Hz), and high frequency (HF, 0.15–0.40 Hz), adjusted for age, sex, body mass index, tobacco exposure, and temperature. For the young panel, a 10,000-particle/cm(3) increase in NC(0.02–1) with 1–4 hr moving average exposure was associated with 0.68–1.35% decreases in SDNN, 1.85–2.58% decreases in r-MSSD, 1.32–1.61% decreases in LF, and 1.57–2.60% decreases in HF. For the elderly panel, a 10,000-particle/cm(3) increase in NC(0.02–1) with 1–3 hr moving average exposure was associated with 1.72–3.00% decreases in SDNN, 2.72–4.65% decreases in r-MSSD, 3.34–5.04% decreases in LF, and 3.61–5.61% decreases in HF. In conclusion, exposure to NC(0.02–1) was associated with decreases in both time-domain and frequency-domain HRV indices in human subjects
Entrepreneur narcissism and unethical pro-organizational behaviour: an examination of mediated-moderation model
Drawing on research taking narcissism as a ‘dark’ side of personality
traits, we examine how and when narcissistic entrepreneurs
are more likely to engage in unethical pro-organizational behaviours
(UPBs). We collected data from 347 entrepreneurial teams in
three entrepreneurial parks of China. The results show that entrepreneur
narcissism is positively related to entrepreneurial goal
difficulty and UPBs, and entrepreneurial goal difficulty mediates
the relationship between entrepreneur narcissism and UPBs; and
these positive associations are stronger when external environment
is more complex. Theoretical and practical implications as
well as research limitation of this study are also discussed
Superradiant Solid in Cavity QED Coupled to a Lattice of Rydberg Gas
We study an optical cavity coupled to a lattice of Rydberg atoms, which can
be represented by a generalized Dicke model. We show that the competition
between the atomic interaction and atom-light coupling induces a rich phase
diagram. A novel "superradiant solid" (SRS) phase is found, where both the
superradiance and crystalline orders coexist. Different from the normal second
order superradiance (SR) transition, here both the Solid-1/2 and SRS to SR
phase transitions are first order. These results are confirmed by the large
scale quantum Monte Carlo simulations.Comment: 5 pages,4 figure
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