3,411 research outputs found
Systemic lupus erythematosus with initial presentation of empyematous pleural effusion in an elderly male patient: A diagnostic challenge
Systemic lupus erythematosus (SLE) poses great difficulty in making an early diagnosis in elderly males, often presenting with atypical manifestations. Acute onset of empyematous pleural effusion has rarely been seen. Herein, we report a 66-year-old man with SLE presenting with rapid progression of bilateral pleural effusion. Diagnostic thoracocentesis disclosed neutrophil-predominant exudates and chest computed tomography revealed multiple loculated pleural effusions. Nevertheless, optimal antibiotic therapy plus surgical decortication of the pleura did not improve his condition. The diagnosis of SLE was readily established after LE cells were accidentally found in the pleural effusion. Large amounts of pleural effusion subsided soon after high dose corticosteroid therapy
Accelerating and Improving AlphaZero Using Population Based Training
AlphaZero has been very successful in many games. Unfortunately, it still
consumes a huge amount of computing resources, the majority of which is spent
in self-play. Hyperparameter tuning exacerbates the training cost since each
hyperparameter configuration requires its own time to train one run, during
which it will generate its own self-play records. As a result, multiple runs
are usually needed for different hyperparameter configurations. This paper
proposes using population based training (PBT) to help tune hyperparameters
dynamically and improve strength during training time. Another significant
advantage is that this method requires a single run only, while incurring a
small additional time cost, since the time for generating self-play records
remains unchanged though the time for optimization is increased following the
AlphaZero training algorithm. In our experiments for 9x9 Go, the PBT method is
able to achieve a higher win rate for 9x9 Go than the baselines, each with its
own hyperparameter configuration and trained individually. For 19x19 Go, with
PBT, we are able to obtain improvements in playing strength. Specifically, the
PBT agent can obtain up to 74% win rate against ELF OpenGo, an open-source
state-of-the-art AlphaZero program using a neural network of a comparable
capacity. This is compared to a saturated non-PBT agent, which achieves a win
rate of 47% against ELF OpenGo under the same circumstances.Comment: accepted by AAAI2020 as oral presentation. In this version,
supplementary materials are adde
Partial wave effects in the heavy quarkonium radiative electromagnetic decays
In a previous paper \cite{Bc}, it was pointed out that the wave functions of
all particles are not pure waves, besides the main partial waves, they all
contain {other partial waves}. It is very interesting to know what role these
different partial waves play in particle transitions. Therefore, by using the
Bethe-Salpeter equation method, we study the radiative electromagnetic decays
and
(). We find that for the and wave dominated states, like the
, , , and etc.,
the dominant and waves provide main and nonrelativistic contrition to
the decays; other partial waves mainly contribute to the relativistic
correction. For the states like the , ,
, and etc., they are the mixing state
dominated by wave or the mixing state dominated by wave. Large
decay widths are found in the transitions ,
, and etc.,
which may be helpful to study the missing states ,
, and .Comment: 31 pages, 19 table
Evaluation of Biological Toxicity of CdTe Quantum Dots with Different Coating Reagents according to Protein Expression of Engineering Escherichia coli
The results obtained from toxicity assessment of quantum dots (QDs) can be used to establish guidelines for the application of QDs in bioimaging. This paper focused on the design of a novel method to evaluate the toxicity of CdTe QDs using engineering Escherichia coli as a model. The toxicity of mercaptoacetic acid (MPA), glutathione (GSH), and L-cysteine (Cys) capped CdTe QDs was analyzed according to the heterologous protein expression in BL21/DE3, engineering Escherichia coli extensively used for protein expression. The results showed that the MPA-CdTe QDs had more serious toxicity than the other two kinds of CdTe QDs. The microscopic images and SEM micrographs further proved that both the proliferation and the protein expression of engineering Escherichia coli were inhibited after treatment with MPA-CdTe QDs. The proposed method is important to evaluate biological toxicity of both QDs and other nanoparticles
A Local-Pattern Related Look-Up Table
This paper describes a Relevance-Zone pattern table (RZT) that can be used to
replace a traditional transposition table. An RZT stores exact game values for
patterns that are discovered during a Relevance-Zone-Based Search (RZS), which
is the current state-of-the-art in solving L&D problems in Go. Positions that
share the same pattern can reuse the same exact game value in the RZT. The
pattern matching scheme for RZTs is implemented using a radix tree, taking into
consideration patterns with different shapes. To improve the efficiency of
table lookups, we designed a heuristic that prevents redundant lookups. The
heuristic can safely skip previously queried patterns for a given position,
reducing the overhead to 10% of the original cost. We also analyze the time
complexity of the RZT both theoretically and empirically. Experiments show the
overhead of traversing the radix tree in practice during lookup remain flat
logarithmically in relation to the number of entries stored in the table.
Experiments also show that the use of an RZT instead of a traditional
transposition table significantly reduces the number of searched nodes on two
data sets of 7x7 and 19x19 L&D Go problems.Comment: Submitted to IEEE Transactions on Games (under review
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