8,342 research outputs found
LSCD: A Large-Scale Screen Content Dataset for Video Compression
Multimedia compression allows us to watch videos, see pictures and hear
sounds within a limited bandwidth, which helps the flourish of the internet.
During the past decades, multimedia compression has achieved great success
using hand-craft features and systems. With the development of artificial
intelligence and video compression, there emerges a lot of research work
related to using the neural network on the video compression task to get rid of
the complicated system. Not only producing the advanced algorithms, but
researchers also spread the compression to different content, such as User
Generated Content(UGC). With the rapid development of mobile devices, screen
content videos become an important part of multimedia data. In contrast, we
find community lacks a large-scale dataset for screen content video
compression, which impedes the fast development of the corresponding
learning-based algorithms. In order to fulfill this blank and accelerate the
research of this special type of videos, we propose the Large-scale Screen
Content Dataset(LSCD), which contains 714 source sequences. Meanwhile, we
provide the analysis of the proposed dataset to show some features of screen
content videos, which will help researchers have a better understanding of how
to explore new algorithms. Besides collecting and post-processing the data to
organize the dataset, we also provide a benchmark containing the performance of
both traditional codec and learning-based methods
Towards theAmbidexterity of Service Processes: Implications for the Managing of IT Usage and Organization Learning
In this study, we develop a conceptual model to illuminate how firms can better compete through service basing on a process view. In accordance with the thought of organizational ambidexterity, we firstly suggest that the efficiency and flexibility in the operation of service process are equally important for organizations desiring to achieve a superior service performance. Additionally, considering that the ambidextrous behavior of organization members is an effective mechanism to attain ambidexterity, we identify two kinds of service behaviors as the crux to promote the ambidextrous state of service processes, concerning IT usage of service personnel and learning behavior of service leaders respectively
Features of the Three Dimensional Structure in the Pacific Sub-surface Layer in Summer
The anomaly of the summer sea temperature is analyzed by a spatial-temporal synthetically rotated orthogonal function (REOF) at three different depths (0 m, 40 m, and 120 m) over the area 110°E~100°W and 30°S~60°N. The spatial-temporal distribution shows that the “signal” of annual anomaly is stronger in the sub-surface layer than the surface layer, and it is stronger in the eastern equatorial Pacific than in the western area. The spatial structure of the sea temperature anomaly at different layers is related to both the ocean current and the interaction of ocean and atmosphere. The temporal changing trend of the sub-surface sea temperature in different areas shows that the annual mean sea temperature increases and the annual variability evidently increases from the 1980s, and these keep the same trend with the increasing El Nino phenomenon very well
Investigation of flow field characteristics and performance of carbon-hydrogen/oxygen-rich air rotating detonation engine
Numerical simulations were conducted to investigate the flow field
characteristics and performance of a carbon-hydrogen/oxygen-rich air rotating
detonation engine (RDE). Three distinct flow field structures were observed in
the gas-solid two-phase RDE. The results show that reducing the hydrogen
equivalence ratio and particle diameter both contribute to the transition from
gas-phase single-front detonation to gas-solid two-phase double-front
detonation and further to gas-solid two-phase single-front detonation. The
effects of solid fuel particle diameter and hydrogen equivalence ratio on the
flow field characteristics and performance are revealed. The results show that
reducing the particle diameter enhances the speed of the two-phase detonation
wave, improves the pressure gain in the combustion chamber, and increases the
specific impulse. Decreasing the hydrogen equivalence ratio reduces the
detonation wave speed, enhances the stability of the detonation flow field,
increases the pressure gain in the detonation wave and combustion chamber and
boosts thrust. Furthermore, the selection of operational conditions to ensure
stable operation and optimal performance of the RDE is discussed. In order to
take into account the requirements of stability, pressure gain performance and
propulsion performance, two-phase single-front detonation should be realized in
gas-solid two-phase RDE, and smaller hydrogen equivalent ratio and appropriate
particle diameter should be selected. According to the conclusion of this
study, the particle diameter should be 0.5-1 {\mu}m. Under such conditions, the
detonation flow field demonstrates good stability, allowing the RDE to achieve
higher pressure gain and specific impulse while maintaining stable operation
Research on Warehouse Target Localization and Tracking Based on KF and WSN
Abstract: This paper firstly established the model of warehouse targeting and tracking system based on Wireless Sensor Networks (WSN). The principle of Location and tracking is based on the maximum likelihood estimation method of multilateral measurement. According to monitoring motion trajectory of the same unknown target node within a continuous period of time, the motion equation can be established. It can achieve the effective tracking of warehouse target that KF algorithm is applied to carrying out the state estimation of warehouse target motion equation. Simulation results show that, while the warehouse target tracking system state equations are linear, using KF algorithm can obtain satisfactory tracking accuracy. Copyright © 2014 IFSA Publishing, S. L
Suppression of epidemic spreading in complex networks by local information based behavioral responses
This work was funded by the National Natural Science Foundation of China (Grant Nos. 61473001, 11105025, and 11331009) and the Doctoral Research Foundation of Anhui University (Grant No. 02303319). Y.C.L. was supported by AFOSR under Grant No. FA9550-10-1-0083.Peer reviewedPublisher PD
- …