372 research outputs found
Quantitative assessment of Earthās radiation belt modeling
The āQuantitative Assessment of Radiation Belt Modelingā focus group was in place at Geospace Environment Modeling from 2014 to 2018. The overarching goals of this focus group were to bring together the current stateāofātheāart models for the acceleration, transport, and loss processes in Earth's radiation belts; develop eventāspecific and global inputs of wave, plasma, and magnetic field to drive these models; and combine all these components to achieve a quantitative assessment of radiation belt modeling by validating against contemporary radiation belt measurements. This article briefly reviews the current understanding of radiation belt dynamics and related modeling efforts, summarizes the activities and accomplishments of the focus group, and discusses future directions.Accepted manuscrip
Quantitative assessment of radiation belt modeling
The āQuantitative Assessment of Radiation Belt Modelingā focus group was in place at Geospace Environment Modeling from 2014 to 2018. The overarching goals of this focus group were to bring together the current stateāofātheāart models for the acceleration, transport, and loss processes in Earth's radiation belts; develop eventāspecific and global inputs of wave, plasma, and magnetic field to drive these models; and combine all these components to achieve a quantitative assessment of radiation belt modeling by validating against contemporary radiation belt measurements. This article briefly reviews the current understanding of radiation belt dynamics and related modeling efforts, summarizes the activities and accomplishments of the focus group, and discusses future directions.Accepted manuscrip
Light Higgs boson in the NMSSM confronted with the CMS diphoton and ditau excesses
In 2018, the CMS collaboration reported a di-photon excess around 95.3 GeV
with a local significance of 2.8 . Interestingly, the CMS collaboration
also reported a di-tau excess recently at 95 100 GeV with a local
significance of 2.6 3.1 . Besides, a excess at 98 GeV
with a 2.3 local significance was reported with LEP data about twenty
years ago. In this work, we consider interpreting these excesses together with
a light Higgs boson in the next-to-minimal supersymmetric standard model
(NMSSM). We conclude that in NMSSM the 95 100 GeV excesses are difficult
to be satisfied simultaneously (not possible globally at level, or
simultaneously at level), and we analyze two partial-satisfied
scenarios: the globally scenario and small di-photon scenario. An
approximate equation of global fit to the three excesses is derived, and two
representative types of surviving samples are analyzed in detail. Since the
mass regions of these excesses are near the Z boson, we also consider checking
the light Higgs boson in the -associated channels. The detailed
results may be useful for further checking the low-mass-region excesses in the
future.Comment: 9 pages, 5 figures, 2 table
A study on the Development of Biopharmaceutical Companies Based on the Context of Big Data
Based on the requirements of the computer technology background in the new era, this paper takes Chinese biopharmaceutical enterprises as the research object, outlines the general characteristics of innovation in Chinese biopharmaceutical enterprises, and analyses the current situation of innovation development in biopharmaceutical enterprises from four aspects: policy, economy, society and technology, followed by an analysis of the current problems faced by innovation in Chinese biopharmaceutical enterprises and the reasons for their generation. Based on literature research, theoretical studies and analysis of the causes of the current innovation problems of Chinese biopharmaceutical enterprises, the factors affecting the innovation performance of Chinese biopharmaceutical enterprises are summarised. The specifics of the conditional variables, as well as the outcome variables, are then identified according to the specific manifestations of poor innovation performance of biopharmaceutical firms. Finally, corresponding countermeasures are proposed in terms of the level of corporate R&D investment, the level of financing channels, the level of government policy support, and the internal management of biopharmaceutical companies, in conjunction with the characteristics of different path models. This paper combines the big data foundation to research and analyse the development of biopharmaceutical enterprises, laying a new research foundation and providing a more efficient research path for the development of the biopharmaceutical industry
Exploiting Spatial-Temporal Context for Interacting Hand Reconstruction on Monocular RGB Video
Reconstructing interacting hands from monocular RGB data is a challenging
task, as it involves many interfering factors, e.g. self- and mutual occlusion
and similar textures. Previous works only leverage information from a single
RGB image without modeling their physically plausible relation, which leads to
inferior reconstruction results. In this work, we are dedicated to explicitly
exploiting spatial-temporal information to achieve better interacting hand
reconstruction. On one hand, we leverage temporal context to complement
insufficient information provided by the single frame, and design a novel
temporal framework with a temporal constraint for interacting hand motion
smoothness. On the other hand, we further propose an interpenetration detection
module to produce kinetically plausible interacting hands without physical
collisions. Extensive experiments are performed to validate the effectiveness
of our proposed framework, which achieves new state-of-the-art performance on
public benchmarks.Comment: 16 page
BEST: BERT Pre-Training for Sign Language Recognition with Coupling Tokenization
In this work, we are dedicated to leveraging the BERT pre-training success
and modeling the domain-specific statistics to fertilize the sign language
recognition~(SLR) model. Considering the dominance of hand and body in sign
language expression, we organize them as pose triplet units and feed them into
the Transformer backbone in a frame-wise manner. Pre-training is performed via
reconstructing the masked triplet unit from the corrupted input sequence, which
learns the hierarchical correlation context cues among internal and external
triplet units. Notably, different from the highly semantic word token in BERT,
the pose unit is a low-level signal originally located in continuous space,
which prevents the direct adoption of the BERT cross-entropy objective. To this
end, we bridge this semantic gap via coupling tokenization of the triplet unit.
It adaptively extracts the discrete pseudo label from the pose triplet unit,
which represents the semantic gesture/body state. After pre-training, we
fine-tune the pre-trained encoder on the downstream SLR task, jointly with the
newly added task-specific layer. Extensive experiments are conducted to
validate the effectiveness of our proposed method, achieving new
state-of-the-art performance on all four benchmarks with a notable gain.Comment: Accepted by AAAI 2023 (Oral
Time-Delayed Data Informed Reinforcement Learning for Approximate Optimal Tracking Control
This paper proposes a time-delayed data informed reinforcement learning
method, referred as incremental adaptive dynamic programming, to learn
approximate solutions to optimal tracking control problems (OTCPs) of
high-dimensional nonlinear systems. Departing from available solutions to
OTCPs, our developed tracking control scheme settles the curse of complexity
problem in value function approximation from a decoupled way, circumvents the
learning inefficiency regarding varying desired trajectories by avoiding
introducing a reference trajectory dynamics into the learning process, and
requires neither an accurate nor identified dynamics using time-delayed
signals. Specifically, the intractable OTCP of a high-dimensional uncertain
system is first converted into multiple manageable sub-OTCPs of low-dimensional
incremental subsystems constructed using time-delayed data. Then, the resulting
sub-OTCPs are approximately solved by a parallel critic learning structure. The
proposed tracking control scheme is developed with rigorous theoretical
analysis of system stability and weight convergence, and validated
experimentally on a 3-DoF robot manipulator
- ā¦