194 research outputs found
Using content-level structures for summarizing microblog repost trees
A microblog repost tree provides strong clues on how an event described therein develops. To help social media users capture the main clues of events on mi-croblogging sites, we propose a novel re-post tree summarization framework by ef-fectively differentiating two kinds of mes-sages on repost trees called leaders and followers, which are derived from content-level structure information, i.e., contents of messages and the reposting relations. To this end, Conditional Random Fields (CRF) model is used to detect leaders across repost tree paths. We then present a variant of random-walk-based summariza-tion model to rank and select salient mes-sages based on the result of leader detec-tion. To reduce the error propagation cas-caded from leader detection, we improve the framework by enhancing the random walk with adjustment steps for sampling from leader probabilities given all the re-posting messages. For evaluation, we construct two annotated corpora, one for leader detection, and the other for repost tree summarization. Experimental results confirm the effectiveness of our method.
Engineering OnâDemand Magnetic CoreâShell Composite Wound Dressing Matrices via Electrohydrodynamic Micro Scale Printing
Herein, electrohydrodynamic (EHD) printing is utilized to produce well-ordered, dual-drug loaded-magnetic coreâshell matrices with high resolution. Coaxial EHD printing is used to load anesthetic lidocaine hydrochloride (LH) and antibiotic tetracycline hydrochloride (TH) in polycaprolactone (PCL) shell formulation and poly (ethylene oxide) (PEO) core formulation, respectively. It is found that when the concentration of PEO is 5% w/w, the fibers exhibit optimum morphology, which is applied in the fabrication of two drug-loaded coreâshell fibers. In addition, adding iron oxide (Fe3O4) nanoparticles (NPs) and varying the concentration of TH within the PCL shell layer influence mechanical properties, release behaviors, and cell behaviors of coaxial EHD printing matrices. The addition of Fe3O4 NPs and increasing TH amount in the fibers enhance the mechanical properties of the matrices. Results show rapid release of LH located in the PEO core fibers, while TH loaded in the shell PCL fibers is released sustainably from the coaxial printing matrices. In addition, the sustainable release period for PCL shell layer can be adjusted using Fe3O4 NPs under auxiliary magnetic field. The coaxial drug-loaded matrices also have good bioactivity, indicating the potential of the printed fibers in wound dressings
Task-oriented Dialogue System for Automatic Disease Diagnosis via Hierarchical Reinforcement Learning
In this paper, we focus on automatic disease diagnosis with reinforcement
learning (RL) methods in task-oriented dialogues setting. Different from
conventional RL tasks, the action space for disease diagnosis (i.e., symptoms)
is inevitably large, especially when the number of diseases increases. However,
existing approaches to this problem employ a flat RL policy, which typically
works well in simple tasks but has significant challenges in complex scenarios
like disease diagnosis. Towards this end, we propose to integrate a
hierarchical policy of two levels into the dialogue policy learning. The high
level policy consists of a model named master that is responsible for
triggering a model in low level, the low level policy consists of several
symptom checkers and a disease classifier. Experimental results on both
self-constructed real-world and synthetic datasets demonstrate that our
hierarchical framework achieves higher accuracy in disease diagnosis compared
with existing systems. Besides, the datasets
(http://www.sdspeople.fudan.edu.cn/zywei/data/Fudan-Medical-Dialogue2.0) and
codes (https://github.com/nnbay/MeicalChatbot-HRL) are all available now
Efficacy and Safety of Clearing Heat and Detoxifying Injection in the Treatment of Influenza: A Randomized, Double-Blinded, Placebo-Controlled Trial
Objective. To evaluate the efficacy and safety of CHDI in the treatment of influenza infection. Method. A randomized double-blind, double dummy trial was conducted. Influenza patients with a positive influenza A rapid test diagnosis were randomized to receive CHDI or oseltamivir. Primary outcome was assessed by the median fever alleviation time and clearance time, and secondary outcome was total scores of influenza symptoms. Results. One hundred thirty-nine participants were screened and 34 had a RT-PCR laboratory confirmation of influenza virus infection. Fever alleviation time was 2.5 and 5 hours in CHDI and oseltamivir, respectively, and fever clearance time was 32.5 and 49 hours. The HR of fever alleviation and clearance time shows no significant difference between two groups. Total scores of influenza symptoms descended significantly in both groups after treatment and descended more in CHDI than oseltamivir on day 2. Similar to total symptoms severity score, fever severity score descend more significantly in CHDI than oseltamivir on day 2, and there were no differences on other symptoms. Conclusions. CHDI have a similar effect to oseltamivir in reducing the duration of influenza illness. CHDI was well tolerated, with no serious adverse events noted during the study period
Chameleon: Plug-and-Play Compositional Reasoning with Large Language Models
Large language models (LLMs) have achieved remarkable progress in various
natural language processing tasks with emergent abilities. However, they face
inherent limitations, such as an inability to access up-to-date information,
utilize external tools, or perform precise mathematical reasoning. In this
paper, we introduce Chameleon, a plug-and-play compositional reasoning
framework that augments LLMs to help address these challenges. Chameleon
synthesizes programs to compose various tools, including LLM models,
off-the-shelf vision models, web search engines, Python functions, and
rule-based modules tailored to user interests. Built on top of an LLM as a
natural language planner, Chameleon infers the appropriate sequence of tools to
compose and execute in order to generate a final response. We showcase the
adaptability and effectiveness of Chameleon on two tasks: ScienceQA and TabMWP.
Notably, Chameleon with GPT-4 achieves an 86.54% accuracy on ScienceQA,
significantly improving upon the best published few-shot model by 11.37%; using
GPT-4 as the underlying LLM, Chameleon achieves a 17.8% increase over the
state-of-the-art model, leading to a 98.78% overall accuracy on TabMWP. Further
studies suggest that using GPT-4 as a planner exhibits more consistent and
rational tool selection and is able to infer potential constraints given the
instructions, compared to other LLMs like ChatGPT.Comment: 25 pages, 10 figures. Project page: https://chameleon-llm.github.i
RCN1 induces sorafenib resistance and malignancy in hepatocellular carcinoma by activating c-MYC signaling via the IRE1뱉XBP1s pathway
The increasing incidence of hepatocellular carcinoma (HCC) is of great concern globally, but the molecular pathogenesis of these tumors remains unclear. Sorafenib is a first-line drug for the treatment of advanced HCC. However, the efficacy of sorafenib in improving patient survival is limited, and most patients inevitably develop resistance to this drug. Recent studies have demonstrated that the activation of the IRE1αâXBP1s pathway might play a protective role in the response to sorafenib and contribute to malignancy in HCC. Here, we found that RCN1, an endoplasmic reticulum resident protein, is significantly upregulated in sorafenib-resistant HCC cells and promotes tumor progression. Our analysis showed that RCN1 may be an independent predictor of tumor recurrence and overall survival. Mechanistically, RCN1 promotes the dissociation of GRP78 from IRE1α in sorafenib-resistant cells by interacting with GRP78 through its EFh1/2 domain. Subsequently, the IRE1αâXBP1s pathway, a branch of the unfolded protein response, is sustainably activated. Interestingly, IRE1αâXBP1s pathway activity is required for c-MYC signaling, one of the most highly activated oncogenic pathways in HCC. These results suggest that RCN1-targeted therapy might be a feasible strategy for the treatment of HCC
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