Fire detection has a great impact on people’s life safety.Fire Detection-DETR(FD-DETR)is a fire detection model based on RT-DETR for early fire identification in complex fire scenes.In this study,Adown sub-sampling m...Fire detection has a great impact on people’s life safety.Fire Detection-DETR(FD-DETR)is a fire detection model based on RT-DETR for early fire identification in complex fire scenes.In this study,Adown sub-sampling module was selected to improve the original convolution module,which improved the detection accuracy and reduced the number of parameter values.Using LSKA attention module on the backbone network further improved the detection accuracy.The experimental results showed that compared with the original RT-DETR model,the precision and mAP of FD-DETR flame detection are increased by 0.8%and 0.1%,respectively,which proves that the improved method proposed in this study effectively improves the feature extraction and feature fusion capabilities of the network.In the complex scene fire detection task,the performance of the improved RT-DETR algorithm is better than the original RT-DETR algorithm.展开更多
目的探索代偿期乙型肝炎肝硬化患者基线指标中可预测肝脏相关终点事件(liver related events,LRE)的危险因素。方法在前瞻性随访的代偿期乙型肝炎肝硬化患者队列中,根据是否发生LRE将患者分为发生LRE组和未发生LRE组,比较两组患者基线特...目的探索代偿期乙型肝炎肝硬化患者基线指标中可预测肝脏相关终点事件(liver related events,LRE)的危险因素。方法在前瞻性随访的代偿期乙型肝炎肝硬化患者队列中,根据是否发生LRE将患者分为发生LRE组和未发生LRE组,比较两组患者基线特征,并分析基线指标中可预测LRE的危险因素。结果共入组106例代偿期乙型肝炎肝硬化患者并随访3年,发生终点事件者18例(17.0%)。发生LRE组的基线血小板水平低于未发生LRE组(P<0.05)。两组患者治疗过程中可见HBV DNA均显著下降。抗病毒治疗后两组血小板水平均增加,但未发生LRE组增加程度高于已发生LRE组(P<0.05)。Cox比例风险模型分析显示,基线血小板水平是预测LRE的独立危险因素(P<0.01)。结论基线血小板水平是预测代偿期乙型肝炎肝硬化患者发生肝脏相关终点事件的独立危险因素。展开更多
An exact solution of the vacuum Einstein＇s field equations is presented, in which there exists a congruence of null geodesics whose shear behaves like a travelling wave of the KdV equation. On the basis of this exact...An exact solution of the vacuum Einstein＇s field equations is presented, in which there exists a congruence of null geodesics whose shear behaves like a travelling wave of the KdV equation. On the basis of this exact solution, the feasibility of solitonic information transmission by exploiting the nonlinearity intrinsic to the Einstein field equations is discussed.展开更多
The new four-dimensional geometry whose Killing vectors span the Poincaré algebra is presented and its structure is analyzed.The new geometry can be regarded as the Poincaré-invariant solution of the degener...The new four-dimensional geometry whose Killing vectors span the Poincaré algebra is presented and its structure is analyzed.The new geometry can be regarded as the Poincaré-invariant solution of the degenerate extension of the vacuum Einstein field equations with a negative cosmological constant and provides a static cosmological spacetime with a Lobachevsky space.The motion of free particles in the spacetime is discussed.展开更多
In this paper, we consider the discrete AKNS-D hierarchy, make the construction of the hierarchy, prove the bilinear identity and give the construction of the τ-functions of this hierarchy.
文摘Fire detection has a great impact on people’s life safety.Fire Detection-DETR(FD-DETR)is a fire detection model based on RT-DETR for early fire identification in complex fire scenes.In this study,Adown sub-sampling module was selected to improve the original convolution module,which improved the detection accuracy and reduced the number of parameter values.Using LSKA attention module on the backbone network further improved the detection accuracy.The experimental results showed that compared with the original RT-DETR model,the precision and mAP of FD-DETR flame detection are increased by 0.8%and 0.1%,respectively,which proves that the improved method proposed in this study effectively improves the feature extraction and feature fusion capabilities of the network.In the complex scene fire detection task,the performance of the improved RT-DETR algorithm is better than the original RT-DETR algorithm.
文摘目的探索代偿期乙型肝炎肝硬化患者基线指标中可预测肝脏相关终点事件(liver related events,LRE)的危险因素。方法在前瞻性随访的代偿期乙型肝炎肝硬化患者队列中,根据是否发生LRE将患者分为发生LRE组和未发生LRE组,比较两组患者基线特征,并分析基线指标中可预测LRE的危险因素。结果共入组106例代偿期乙型肝炎肝硬化患者并随访3年,发生终点事件者18例(17.0%)。发生LRE组的基线血小板水平低于未发生LRE组(P<0.05)。两组患者治疗过程中可见HBV DNA均显著下降。抗病毒治疗后两组血小板水平均增加,但未发生LRE组增加程度高于已发生LRE组(P<0.05)。Cox比例风险模型分析显示,基线血小板水平是预测LRE的独立危险因素(P<0.01)。结论基线血小板水平是预测代偿期乙型肝炎肝硬化患者发生肝脏相关终点事件的独立危险因素。
基金The project supported by National Natural Science Foundation of China under Grant Nos. 10231050 and 10375087, and National Key Basic Research Project of China under Grant Nos. 2004CB31800 and 2006CB805905
文摘An exact solution of the vacuum Einstein＇s field equations is presented, in which there exists a congruence of null geodesics whose shear behaves like a travelling wave of the KdV equation. On the basis of this exact solution, the feasibility of solitonic information transmission by exploiting the nonlinearity intrinsic to the Einstein field equations is discussed.
基金Supported by the National Natural Science Foundation of China under Grant Nos.10775140,10705048,10731080,10975141,11175245,11075206the Fundamental Research Funds for the Central Universities under Grant No.105116.
文摘The new four-dimensional geometry whose Killing vectors span the Poincaré algebra is presented and its structure is analyzed.The new geometry can be regarded as the Poincaré-invariant solution of the degenerate extension of the vacuum Einstein field equations with a negative cosmological constant and provides a static cosmological spacetime with a Lobachevsky space.The motion of free particles in the spacetime is discussed.
基金The project supported by National Natural Science Foundation of China under Grant No. 10375087, Fost-doctor Foundation ot China and K.C. Wong Education Fotmdation, Hong Kong The author would like to thank Prof. K. Wu for his helpful discussion.
文摘In this paper, we consider the discrete AKNS-D hierarchy, make the construction of the hierarchy, prove the bilinear identity and give the construction of the τ-functions of this hierarchy.
