This study reports that the carbon star CGCS 673 is a semi-regular(SR)variable star with a period of 135 d and an amplitude of 0.18mag in the V-band.The light curve obtained by this study correlates well with the SR c...This study reports that the carbon star CGCS 673 is a semi-regular(SR)variable star with a period of 135 d and an amplitude of 0.18mag in the V-band.The light curve obtained by this study correlates well with the SR classification as the photometric data obtained show noticeable periodicity in the light changes of CGCS 673 that is occasionally interrupted by a period of irregular variability.The derived period and colour index obtained from our data and those from professional databases indicate that the attributes of this star fall within the parameters of the SR class of variable stars.Following our notification of the discovery that this star is a variable source,CGCS 673 has received the AAVSO Unique Identifier of(AAVSO UID)000-BMZ-492.展开更多
<p align="justify"> <span style="font-family:Verdana;">In this paper, tiling a plane with equilateral semi-regular convex polygons is considered, and, that is, tiling with equilateral p...<p align="justify"> <span style="font-family:Verdana;">In this paper, tiling a plane with equilateral semi-regular convex polygons is considered, and, that is, tiling with equilateral polygons of<span style="font-family:Verdana;"> the same type. Tiling a plane with semi-regular polygons depends not only on the type of a semi-regular polygon, but also on its interior angles that join at a node. In relation to the interior angles, semi-regular equilateral polygons with the same or different interior angles can be joined in the nodes. Here, we shall first consider tiling a plane with semi-regular equilateral polygons with 2m-sides. The analysis is performed by determining the set of all integer solutions of the corresponding Diophantine equation in the form of <img alt="" src="Edit_c185b1c4-6b78-4af5-b1c2-4932af77bf65.png" />, where<img alt="" src="Edit_2e6548d5-3254-4005-b19e-9d49cd5d6f81.png" />are the non-negative integers which are not equal to zero at the same time, and <img alt="" src="Edit_a6dbde8a-5f3a-43d4-bc89-27dcc3057d23.png" />are the interior angles of a semi-regular equilateral polygon from the characteristic angle. It is shown that of all semi-regular equilateral polygons with 2m-sides, a plane can be tiled only with the semi-regular equilateral quadrilaterals and semi-regular equilateral hexagons. Then, the problem of tiling a plane with semi-regular equilateral quadrilaterals is analyzed in detail, and then the one with semi-regular equilateral hexagons. For these semi-regular polygons, all possible solutions of the corresponding Diophantine equations were analyzed and all nodes were determined, and then the problem for different values of characteristic elements was observed. For some of the observed cases of tiling a plane with these semi-regular polygons, some graphical presentations of tiling constructions are also given.展开更多
Motivated by a paper of Fang (2009), we study the Samuel multiplicity and the structure of essentially semi-regular operators on an infinite-dimensional complex Banach space. First, we generalize Fang's results co...Motivated by a paper of Fang (2009), we study the Samuel multiplicity and the structure of essentially semi-regular operators on an infinite-dimensional complex Banach space. First, we generalize Fang's results concerning Samuel multiplicity from semi-Fredholm operators to essentially semi-regular operators by elementary methods in operator theory. Second, we study the structure of essentially semi-regular operators. More precisely, we present a revised version of Fang's 4 × 4 upper triangular model with a little modification, and prove it in detail after providing numerous preliminary results, some of which are inspired by Fang's paper. At last, as some applications, we get the structure of semi-Fredholm operators which revised Fang's 4 × 4 upper triangular model, from a different viewpoint, and characterize a semi-regular point λ∈ C in an essentially semi-regular domain.展开更多
建筑物的变化检测在遥感图像处理和模式识别领域中具有重要意义,但在深度学习算法的应用中,数据标注一直是一个显著的挑战,特别是在变化检测的场景下。因此,针对基于深度学习的变化检测算法中数据标注的难题,本文提出了一种半监督学习...建筑物的变化检测在遥感图像处理和模式识别领域中具有重要意义,但在深度学习算法的应用中,数据标注一直是一个显著的挑战,特别是在变化检测的场景下。因此,针对基于深度学习的变化检测算法中数据标注的难题,本文提出了一种半监督学习方法。该方法采用了融合双时相特征的孪生网络来进行特征提取,并构建了一个教师-学生网络框架以实施模型的半监督训练。为了进一步提升半监督变化检测的准确度,本文在深度特征上引入了随机扰动,以此来实现一致性正则化。此外,在图像深度特征的层面上,本文还提出通过捕获双时相图像特征的差异来形成决策边界以区分双时相图变化的方法。该方法在Levir-CD和WHU_Building两个公开数据集上分别实现了83.04%和85.57%的交并比(Intersection over Union,IoU)。实验结果表明,本文提出的方法在使用少量标注数据的前提下,能够达到与全监督训练相近的性能。展开更多
Responsive facades can reduce building energy consumption and control daylight and natural ventilation to improve user comfort.This study aims to develop alternative responsive facade systems based on semi-regular and...Responsive facades can reduce building energy consumption and control daylight and natural ventilation to improve user comfort.This study aims to develop alternative responsive facade systems based on semi-regular and demi-regular tessellations.For this purpose,first,the tessellation method used to generate responsive facades is introduced.Then,the geometric and parametric design principles and the movement capabilities of the proposed facade systems are presented.Finally,a set of analyses are performed to test and compare the performances of the facade systems based on daylight metrics and indoor glare comfort.This study contributes to the literature with the proposed facade systems that can adapt to changing environmental conditions,provide flexibility in shape control and simplicity in mechanism design,and improve building performance.The analysis results show that all the proposed facade systems provide the desired visual comfort and daylight levels at different configurations.展开更多
现有的半监督声音事件检测方法直接使用强标签合成样本、弱标签真实样本和无标签真实样本进行训练,以缓解标签样本量不足的问题。然而,合成和真实数据域之间存在不可避免的分布差异,这种差异会干扰模型梯度优化方向,从而限制模型的泛化...现有的半监督声音事件检测方法直接使用强标签合成样本、弱标签真实样本和无标签真实样本进行训练,以缓解标签样本量不足的问题。然而,合成和真实数据域之间存在不可避免的分布差异,这种差异会干扰模型梯度优化方向,从而限制模型的泛化能力。针对这一问题,基于元学习(Meta Learning)提出了一种新颖的半监督声音事件检测学习范式MMT(Meta Mean Teacher)。具体来说,对于每个训练批次的数据,将其分为由合成样本组成的元训练集和由真实样本组成的元测试集;将模型在元训练集上计算的元梯度作为元测试梯度更新的指导,使模型感知并学习到更具泛化性的知识。在DCASE2021任务4数据集的测试集上进行对比实验,结果表明,相较于官方基线,所提出的学习范式MMT在F1,PSDS1和PSDS2指标上分别提升了8.9%,6.6%和1.1%;相较于当前的先进方法,所提出的学习范式MMT同样表现出了显著的性能优势。展开更多
基金This research was made possible through the use of the AAVSO Photometric All-Sky Survey(APASS),funded by the Robert Martin Ayers Sciences Fund and NSF AST-1412587.
文摘This study reports that the carbon star CGCS 673 is a semi-regular(SR)variable star with a period of 135 d and an amplitude of 0.18mag in the V-band.The light curve obtained by this study correlates well with the SR classification as the photometric data obtained show noticeable periodicity in the light changes of CGCS 673 that is occasionally interrupted by a period of irregular variability.The derived period and colour index obtained from our data and those from professional databases indicate that the attributes of this star fall within the parameters of the SR class of variable stars.Following our notification of the discovery that this star is a variable source,CGCS 673 has received the AAVSO Unique Identifier of(AAVSO UID)000-BMZ-492.
文摘<p align="justify"> <span style="font-family:Verdana;">In this paper, tiling a plane with equilateral semi-regular convex polygons is considered, and, that is, tiling with equilateral polygons of<span style="font-family:Verdana;"> the same type. Tiling a plane with semi-regular polygons depends not only on the type of a semi-regular polygon, but also on its interior angles that join at a node. In relation to the interior angles, semi-regular equilateral polygons with the same or different interior angles can be joined in the nodes. Here, we shall first consider tiling a plane with semi-regular equilateral polygons with 2m-sides. The analysis is performed by determining the set of all integer solutions of the corresponding Diophantine equation in the form of <img alt="" src="Edit_c185b1c4-6b78-4af5-b1c2-4932af77bf65.png" />, where<img alt="" src="Edit_2e6548d5-3254-4005-b19e-9d49cd5d6f81.png" />are the non-negative integers which are not equal to zero at the same time, and <img alt="" src="Edit_a6dbde8a-5f3a-43d4-bc89-27dcc3057d23.png" />are the interior angles of a semi-regular equilateral polygon from the characteristic angle. It is shown that of all semi-regular equilateral polygons with 2m-sides, a plane can be tiled only with the semi-regular equilateral quadrilaterals and semi-regular equilateral hexagons. Then, the problem of tiling a plane with semi-regular equilateral quadrilaterals is analyzed in detail, and then the one with semi-regular equilateral hexagons. For these semi-regular polygons, all possible solutions of the corresponding Diophantine equations were analyzed and all nodes were determined, and then the problem for different values of characteristic elements was observed. For some of the observed cases of tiling a plane with these semi-regular polygons, some graphical presentations of tiling constructions are also given.
基金supported by National Natural Science Foundation of China (Grant No.11171066)Specialized Research Fund for the Doctoral Program of Higher Education (Grant Nos. 2010350311001 and 20113503120003)+1 种基金Natural Science Foundation of Fujian Province (Grant Nos. 2011J05002 and 2012J05003)Foundation of the Education Department of Fujian Province (Grant No. JB10042)
文摘Motivated by a paper of Fang (2009), we study the Samuel multiplicity and the structure of essentially semi-regular operators on an infinite-dimensional complex Banach space. First, we generalize Fang's results concerning Samuel multiplicity from semi-Fredholm operators to essentially semi-regular operators by elementary methods in operator theory. Second, we study the structure of essentially semi-regular operators. More precisely, we present a revised version of Fang's 4 × 4 upper triangular model with a little modification, and prove it in detail after providing numerous preliminary results, some of which are inspired by Fang's paper. At last, as some applications, we get the structure of semi-Fredholm operators which revised Fang's 4 × 4 upper triangular model, from a different viewpoint, and characterize a semi-regular point λ∈ C in an essentially semi-regular domain.
文摘建筑物的变化检测在遥感图像处理和模式识别领域中具有重要意义,但在深度学习算法的应用中,数据标注一直是一个显著的挑战,特别是在变化检测的场景下。因此,针对基于深度学习的变化检测算法中数据标注的难题,本文提出了一种半监督学习方法。该方法采用了融合双时相特征的孪生网络来进行特征提取,并构建了一个教师-学生网络框架以实施模型的半监督训练。为了进一步提升半监督变化检测的准确度,本文在深度特征上引入了随机扰动,以此来实现一致性正则化。此外,在图像深度特征的层面上,本文还提出通过捕获双时相图像特征的差异来形成决策边界以区分双时相图变化的方法。该方法在Levir-CD和WHU_Building两个公开数据集上分别实现了83.04%和85.57%的交并比(Intersection over Union,IoU)。实验结果表明,本文提出的方法在使用少量标注数据的前提下,能够达到与全监督训练相近的性能。
文摘Responsive facades can reduce building energy consumption and control daylight and natural ventilation to improve user comfort.This study aims to develop alternative responsive facade systems based on semi-regular and demi-regular tessellations.For this purpose,first,the tessellation method used to generate responsive facades is introduced.Then,the geometric and parametric design principles and the movement capabilities of the proposed facade systems are presented.Finally,a set of analyses are performed to test and compare the performances of the facade systems based on daylight metrics and indoor glare comfort.This study contributes to the literature with the proposed facade systems that can adapt to changing environmental conditions,provide flexibility in shape control and simplicity in mechanism design,and improve building performance.The analysis results show that all the proposed facade systems provide the desired visual comfort and daylight levels at different configurations.
文摘现有的半监督声音事件检测方法直接使用强标签合成样本、弱标签真实样本和无标签真实样本进行训练,以缓解标签样本量不足的问题。然而,合成和真实数据域之间存在不可避免的分布差异,这种差异会干扰模型梯度优化方向,从而限制模型的泛化能力。针对这一问题,基于元学习(Meta Learning)提出了一种新颖的半监督声音事件检测学习范式MMT(Meta Mean Teacher)。具体来说,对于每个训练批次的数据,将其分为由合成样本组成的元训练集和由真实样本组成的元测试集;将模型在元训练集上计算的元梯度作为元测试梯度更新的指导,使模型感知并学习到更具泛化性的知识。在DCASE2021任务4数据集的测试集上进行对比实验,结果表明,相较于官方基线,所提出的学习范式MMT在F1,PSDS1和PSDS2指标上分别提升了8.9%,6.6%和1.1%;相较于当前的先进方法,所提出的学习范式MMT同样表现出了显著的性能优势。
