When evaluating the seismic safety and reliability of complex engineering structures,it is a critical problem to reasonably consider the randomness and multi-dimensional nature of ground motions.To this end,a proposed...When evaluating the seismic safety and reliability of complex engineering structures,it is a critical problem to reasonably consider the randomness and multi-dimensional nature of ground motions.To this end,a proposed modeling strategy of multi-dimensional stochastic earthquakes is addressed in this study.This improved seismic model has several merits that enable it to better provide seismic analyses of structures.Specifically,at first,the ground motion model is compatible with the design response spectrum.Secondly,the evolutionary power spectrum involved in the model and the design response spectrum are constructed accordingly with sufficient consideration of the correlation between different seismic components.Thirdly,the random function-based dimension-reduction representation is applied,by which seismic modeling is established,with three elementary random variables.Numerical simulations of multi-dimensional stochastic ground motions in a specific design scenario indicate the effectiveness of the proposed modeling strategy.Moreover,the multi-dimensional seismic response and the global reliability of a high-rise frame-core tube structure is discussed in detail to further illustrate the engineering applicability of the proposed method.The analytical investigations demonstrate that the suggested stochastic model of multi-dimensional ground motion is available for accurate seismic response analysis and dynamic reliability assessment of complex engineering structures for performance-based seismic resistance design.展开更多
It was proved in this paper that there exists a labeled resolvable block design LRB (4,3; v ) if and only if v ≡0 (mod 4) and v ≥8, with 8 possible exceptions. It was also proved that there exists a nearly Kirkman s...It was proved in this paper that there exists a labeled resolvable block design LRB (4,3; v ) if and only if v ≡0 (mod 4) and v ≥8, with 8 possible exceptions. It was also proved that there exists a nearly Kirkman system NKS (2,4; v ) if and only if v ≡0 (mod 12) and v ≥24, except possibly when v =264 or 372.展开更多
There are many problems when traditional temperature sensing radio frequency identification(RFID) tags are applied to logistics temperature monitoring, such as inconvenient data reading, large power consumption, and l...There are many problems when traditional temperature sensing radio frequency identification(RFID) tags are applied to logistics temperature monitoring, such as inconvenient data reading, large power consumption, and low bandwidth. Therefore, a low-dissipation electronic tag is designed in this paper to solve the above problems. The electronic tag and the portable temperature recorder were placed in the same position in the same refrigeration unit, and the temperature of the same space was recorded at the same time. The data measured by the designed electronic tag was used as the measured value, and the data measured by the portable temperature recorder was used as the standard value. The correlation coefficient between the two was calculated to be 0.866 9, the root mean square error(RMSE) was 0.796 7 ℃, and the average relative deviation(ARD) was 16.21%. Therefore, the electronic tag designed in this study can meet the requirements of users for temperature monitoring and recording. The temperature control switch designed in this study can disconnect the power supply to single chip microcomputer(SCM) and other modules when the temperature is in the range of normal threshold, so that the power consumption is further reduced and the cost is reduced. The results of this study laid a foundation for the development of low-cost and easy-to-use temperature monitoring technology in the logistics process.展开更多
This paper proposes a class of novel progressive edge growth-based codebooks for downlink sparse code multiple access(SCMA)systems.In the first scheme,we propose to progressively design the codebooks of each resource ...This paper proposes a class of novel progressive edge growth-based codebooks for downlink sparse code multiple access(SCMA)systems.In the first scheme,we propose to progressively design the codebooks of each resource node(RN)instead of rotating a mother constellation(MC)as in the conventional SCMA works.In the other one,based on the MC,a multi-resources rotated codebooks are proposed to improve the performance of the superimposed constellations.The resultant codebooks are respectively referred to as the resource edge multidimensional codebooks(REMC)and the user edge multi-dimensional codebooks(UEMC).Additionally,we delve into the detailed design of the MC and the superimposed constellation.Then,we pay special attention to the application of the proposed schemes to challenging design cases,particularly for the high dimensional,high rate,and irregular codebooks,where the corresponding simplified schemes are proposed to reduce the complexity of codebook design.Finally,simulation results are presented to demonstrate the superiority of our progressive edge growth-based schemes.The numerical results indicate that the proposed codebooks significantly outperform the stateof-the-art codebooks.In addition,we also show that the proposed REMC codebooks outperform in the lower signal-to-noise ratio(SNR)regime,whereas the UEMC codebooks exhibit better performance at higher SNRs.展开更多
AGED,全称为ArGument Extractor with Definitions in FrameNet,是最近提出的一种框架语义角色标注(FSRL)模型。该模型以框架和框架元素的定义为模板,在整个训练语料上使用预训练语言模型进行编码,是一种基于论元查询的FSRL模型。然而,...AGED,全称为ArGument Extractor with Definitions in FrameNet,是最近提出的一种框架语义角色标注(FSRL)模型。该模型以框架和框架元素的定义为模板,在整个训练语料上使用预训练语言模型进行编码,是一种基于论元查询的FSRL模型。然而,随着语料规模和模型参数的日益增加,AGED模型的训练和超参数调优变得相当耗时,进而影响了AGED模型的训练和调优效率。为此,该文在训练阶段引入集成学习方法,在调优阶段引入正交设计方法,提出了基于正则化m×2交叉验证(m×2 BCV)的AGED集成模型。具体地,在训练阶段,该文引入m×2 BCV和众数投票结合的集成学习方法,在整个训练语料上使用m×2 BCV构造多组训练子集和验证子集;然后利用并行训练技术和AGED模型生成多个AGED子模型;最后利用众数投票方法集成这些子模型,构造性能更优的AGED集成模型。在调优阶段,使用正交设计方法,以最大化验证集上F_(1)值为优化目标,从AGED集成模型的大量超参数组合中选出一部分具有代表性的超参数组合进行调优。实验结果表明,与AGED模型相比,提出的AGED集成模型在测试集上的F_(1)值可以提高1.34百分点,且训练时间仅占AGED模型的0.79倍,这充分验证了AGED集成模型的有效性。此外,该文也开展了消融实验,验证了AGED集成模型中引入的集成学习方法和正交设计方法的有效性。展开更多
基金National Natural Science Foundation of China under Grant Nos.51978543,52108444,and 51778343Plan of Outstanding Young and Middle-aged Scientific and Technological Innovation Team in the Universities of Hubei Province with Project No.T2020010Natural Science Foundation of Hebei Province under Grant No.E2021512001。
文摘When evaluating the seismic safety and reliability of complex engineering structures,it is a critical problem to reasonably consider the randomness and multi-dimensional nature of ground motions.To this end,a proposed modeling strategy of multi-dimensional stochastic earthquakes is addressed in this study.This improved seismic model has several merits that enable it to better provide seismic analyses of structures.Specifically,at first,the ground motion model is compatible with the design response spectrum.Secondly,the evolutionary power spectrum involved in the model and the design response spectrum are constructed accordingly with sufficient consideration of the correlation between different seismic components.Thirdly,the random function-based dimension-reduction representation is applied,by which seismic modeling is established,with three elementary random variables.Numerical simulations of multi-dimensional stochastic ground motions in a specific design scenario indicate the effectiveness of the proposed modeling strategy.Moreover,the multi-dimensional seismic response and the global reliability of a high-rise frame-core tube structure is discussed in detail to further illustrate the engineering applicability of the proposed method.The analytical investigations demonstrate that the suggested stochastic model of multi-dimensional ground motion is available for accurate seismic response analysis and dynamic reliability assessment of complex engineering structures for performance-based seismic resistance design.
文摘It was proved in this paper that there exists a labeled resolvable block design LRB (4,3; v ) if and only if v ≡0 (mod 4) and v ≥8, with 8 possible exceptions. It was also proved that there exists a nearly Kirkman system NKS (2,4; v ) if and only if v ≡0 (mod 12) and v ≥24, except possibly when v =264 or 372.
文摘There are many problems when traditional temperature sensing radio frequency identification(RFID) tags are applied to logistics temperature monitoring, such as inconvenient data reading, large power consumption, and low bandwidth. Therefore, a low-dissipation electronic tag is designed in this paper to solve the above problems. The electronic tag and the portable temperature recorder were placed in the same position in the same refrigeration unit, and the temperature of the same space was recorded at the same time. The data measured by the designed electronic tag was used as the measured value, and the data measured by the portable temperature recorder was used as the standard value. The correlation coefficient between the two was calculated to be 0.866 9, the root mean square error(RMSE) was 0.796 7 ℃, and the average relative deviation(ARD) was 16.21%. Therefore, the electronic tag designed in this study can meet the requirements of users for temperature monitoring and recording. The temperature control switch designed in this study can disconnect the power supply to single chip microcomputer(SCM) and other modules when the temperature is in the range of normal threshold, so that the power consumption is further reduced and the cost is reduced. The results of this study laid a foundation for the development of low-cost and easy-to-use temperature monitoring technology in the logistics process.
文摘This paper proposes a class of novel progressive edge growth-based codebooks for downlink sparse code multiple access(SCMA)systems.In the first scheme,we propose to progressively design the codebooks of each resource node(RN)instead of rotating a mother constellation(MC)as in the conventional SCMA works.In the other one,based on the MC,a multi-resources rotated codebooks are proposed to improve the performance of the superimposed constellations.The resultant codebooks are respectively referred to as the resource edge multidimensional codebooks(REMC)and the user edge multi-dimensional codebooks(UEMC).Additionally,we delve into the detailed design of the MC and the superimposed constellation.Then,we pay special attention to the application of the proposed schemes to challenging design cases,particularly for the high dimensional,high rate,and irregular codebooks,where the corresponding simplified schemes are proposed to reduce the complexity of codebook design.Finally,simulation results are presented to demonstrate the superiority of our progressive edge growth-based schemes.The numerical results indicate that the proposed codebooks significantly outperform the stateof-the-art codebooks.In addition,we also show that the proposed REMC codebooks outperform in the lower signal-to-noise ratio(SNR)regime,whereas the UEMC codebooks exhibit better performance at higher SNRs.
文摘AGED,全称为ArGument Extractor with Definitions in FrameNet,是最近提出的一种框架语义角色标注(FSRL)模型。该模型以框架和框架元素的定义为模板,在整个训练语料上使用预训练语言模型进行编码,是一种基于论元查询的FSRL模型。然而,随着语料规模和模型参数的日益增加,AGED模型的训练和超参数调优变得相当耗时,进而影响了AGED模型的训练和调优效率。为此,该文在训练阶段引入集成学习方法,在调优阶段引入正交设计方法,提出了基于正则化m×2交叉验证(m×2 BCV)的AGED集成模型。具体地,在训练阶段,该文引入m×2 BCV和众数投票结合的集成学习方法,在整个训练语料上使用m×2 BCV构造多组训练子集和验证子集;然后利用并行训练技术和AGED模型生成多个AGED子模型;最后利用众数投票方法集成这些子模型,构造性能更优的AGED集成模型。在调优阶段,使用正交设计方法,以最大化验证集上F_(1)值为优化目标,从AGED集成模型的大量超参数组合中选出一部分具有代表性的超参数组合进行调优。实验结果表明,与AGED模型相比,提出的AGED集成模型在测试集上的F_(1)值可以提高1.34百分点,且训练时间仅占AGED模型的0.79倍,这充分验证了AGED集成模型的有效性。此外,该文也开展了消融实验,验证了AGED集成模型中引入的集成学习方法和正交设计方法的有效性。
