1,262 research outputs found
Response Time Bounds for DAG Tasks with Arbitrary Intra-Task Priority Assignment
Most parallel real-time applications can be modeled as directed acyclic graph (DAG) tasks. Intra-task priority assignment can reduce the nondeterminism of runtime behavior of DAG tasks, possibly resulting in a smaller worst-case response time. However, intra-task priority assignment incurs dependencies between different parts of the graph, making it a challenging problem to compute the response time bound. Existing work on intra-task task priority assignment for DAG tasks is subject to the constraint that priority assignment must comply with the topological order of the graph, so that the response time bound can be computed in polynomial time. In this paper, we relax this constraint and propose a new method to compute response time bound of DAG tasks with arbitrary priority assignment. With the benefit of our new method, we present a simple but effective priority assignment policy, leading to smaller response time bounds. Comprehensive evaluation with both single-DAG systems and multi-DAG systems demonstrates that our method outperforms the state-of-the-art method with a considerable margin
Cyclotron Dynamics of a Kondo Singlet in a Spin-Orbit-Coupled Alkaline-Earth Atomic Gas
We propose a scheme to investigate the interplay between Kondo-exchange
interaction and quantum spin Hall effect with ultracold fermionic
alkaline-earth atoms trapped in two-dimensional optical lattices using
ultracold collision and laser-assisted tunneling. In the strong Kondo-coupling
regime, though the loop trajectory of the mobile atom disappears, collective
dynamics of an atom pair in two clock states can exhibit an unexpected
spin-dependent cyclotron orbit in a plaquette, realizing the quantum spin Hall
effect of the Kondo singlet. We demonstrate that the collective cyclotron
dynamics of the spin-zero Kondo singlet is governed by an effective
Harper-Hofstadter model in addition to second-order diagonal tunneling
Multi-Path Bound for DAG Tasks
This paper studies the response time bound of a DAG (directed acyclic graph)
task. Recently, the idea of using multiple paths to bound the response time of
a DAG task, instead of using a single longest path in previous results, was
proposed and leads to the so-called multi-path bound. Multi-path bounds can
greatly reduce the response time bound and significantly improve the
schedulability of DAG tasks. This paper derives a new multi-path bound and
proposes an optimal algorithm to compute this bound. We further present a
systematic analysis on the dominance and the sustainability of three existing
multi-path bounds and the proposed multi-path bound. Our bound theoretically
dominates and empirically outperforms all existing multi-path bounds. What's
more, the proposed bound is the only multi-path bound that is proved to be
self-sustainable
Influence of green technology, tourism, and inclusive financial development on ecological sustainability: exploring the path toward green revolution
This study demonstrates the linkages between green technological
innovations, sustainable tourism, financial development,
economic growth, and ecological sustainability using China’s
regional data from 2000 to 2019. The study applies the novel estimation
technique, Quantile Autoregressive Distributive Lag
(QARDL) approach to examine long-run and short-run relationships
between the stated variables. The initial findings confirm
non-linearity in the data verified through J-B test statistics. It
approves the implication of QARDL estimation for exploring ecological
sustainability trends over the study period. The study outcomes
confirm that tourism and green technology innovation
assists in reducing ecological footprints in China in the long run.
Moreover, financial development and economic growth reflect a
direct role towards more ecological footprints; therefore, the sustainability
dimension has been missing both in financial development
and growth. Furthermore, the results in the short run cover
the same phenomenon and confirm that ecological innovations
and tourism would help in sustaining the natural environment.
The study outcomes demonstrate that government officials in
China should specifically implement long-term policies to support
the natural environment from adverse shocks of more financial
development and economic growth
Nutrition Mission--A Multimedia Educational Tool for Youth Grades 4 - 6
Nutrition Mission is a multimedia educational CD-ROM with an accompanying Web site designed to teach 4th - 6th grade students about making healthy food and activity choices. The CD-ROM incorporates a rich learning environment using graphics, audio, video, and interactive animations to excite students and make learning about nutrition fun. The CD includes lessons about the food guide pyramid, food labels, nutrient density, fast foods, snacking, physical activity, and food science experiments. Preliminary data indicates that the majority of youth acquire knowledge and skills related to foods, nutrition, and physical activity
Physical layer security enhancement in multi-user multi-full-duplex-relay networks
We propose a novel joint user and full-duplex (FD)
relay selection (JUFDRS) scheme to enhance physical layer
security in a multi-user multi-relay network. In this scheme, the
user and the FD decode-and-forward relay are selected such
that the capacity of the end-to-end channel (i.e., the user-relaydestination
channel) is maximized to ensure the highest quality of
cooperative transmission. In order to fully examine the benefits
of the JUFDRS scheme, we derive a new closed-form expression
for the secrecy outage probability. We show that the JUFDRS
scheme significantly outperforms the joint user and half-duplex
relay selection (JUHDRS) scheme when the self-interference at
the FD relay can be reasonably suppressed. This result indicates
that adopting the FD technique at relays can effectively enhance
the physical layer secrecy performance in the multi-user multirelay
network.ARC Discovery Projects Grant DP150103905
Particle Swarm Algorithm to Optimize LSTM Short-Term Load Forecasting
Accurate load forecasting is of great significance for national and grid planning and management. In order to improve the accuracy of short-term load forecasting, an LSTM prediction model based on particle swarm optimization (PSO)algorithm is proposed. LSTM has the characteristics of avoiding gradient disappearance and gradient explosion, but there is a problem that parameters are difficult to select. Therefore, particle swarm optimization algorithm is used to help it select parameters. The experimental results show that the optimized LSTM has higher prediction accuracy
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