The menstrual cycle has been a topic of interest in relation to behavior and cognition for many years, with historical beliefs associating it with cognitive impairment. However, recent research has challenged these be...The menstrual cycle has been a topic of interest in relation to behavior and cognition for many years, with historical beliefs associating it with cognitive impairment. However, recent research has challenged these beliefs and suggested potential positive effects of the menstrual cycle on cognitive performance. Despite these emerging findings, there is still a lack of consensus regarding the impact of the menstrual cycle on cognition, particularly in domains such as spatial reasoning, visual memory, and numerical memory. Hence, this study aimed to explore the relationship between the menstrual cycle and cognitive performance in these specific domains. Previous studies have reported mixed findings, with some suggesting no significant association and others indicating potential differences across the menstrual cycle. To contribute to this body of knowledge, we explored the research question of whether the menstrual cycles have a significant effect on cognition, particularly in the domains of spatial reasoning, visual and numerical memory in a regionally diverse sample of menstruating females. A total of 30 menstruating females from mixed geographical backgrounds participated in the study, and a repeated measures design was used to assess their cognitive performance in two phases of the menstrual cycle: follicular and luteal. The results of the study revealed that while spatial reasoning was not significantly related to the menstrual cycle (p = 0.256), both visual and numerical memory had significant positive associations (p < 0.001) with the luteal phase. However, since the effect sizes were very small, the importance of this relationship might be commonly overestimated. Future studies could thus entail designs with larger sample sizes, including neuro-biological measures of menstrual stages, and consequently inform competent interventions and support systems.展开更多
星间精密测距是导航星座实现自主导航的核心技术。针对导航星座中码测量值精度低但无整周模糊度,载波相位测量值精度高但存在整周模糊度的特点,该文根据贝叶斯递推原理提出了一种衰减记忆高斯和滤波(Fading Memory Gaussian Sum Filter,...星间精密测距是导航星座实现自主导航的核心技术。针对导航星座中码测量值精度低但无整周模糊度,载波相位测量值精度高但存在整周模糊度的特点,该文根据贝叶斯递推原理提出了一种衰减记忆高斯和滤波(Fading Memory Gaussian Sum Filter,FMGSF)的伪距估计方法。该方法用高斯和形式近似表示系统后验概率密度,并根据卡尔曼滤波原理来更新高斯项的均值和方差,同时引入衰减记忆因子克服由于模型失配导致的滤波结果发散问题,利用重采样解决由于载波相位测量值不确定导致的算法复杂度增加问题。理论分析和仿真结果表明,该文提出的方法不仅能够克服周跳对伪距估计的影响,而且可以获得更好的测距精度。展开更多
Historic preservation and heritage conservation are two mainstream concepts related to the sustainability and renewal of historic houses.With the aim of enhancing the sustainability of historic houses,this article cri...Historic preservation and heritage conservation are two mainstream concepts related to the sustainability and renewal of historic houses.With the aim of enhancing the sustainability of historic houses,this article criticizes the view of historic preservation that insists on preserving historic houses with their old appearances,which does not fully develop their sustainability.In contrast,the article provides support for the view of heritage conservation that aims to promote the sustainability of historic houses and related legislation.In the second and third parts,this article examines the theoretical origin of historic preservation,which emphasizes and summarizes the one-way protection of cultural memory via historic houses.In the fourth part,the article turns to heritage conservation,highlights the sustainable cycle between historic houses and cultural memory,and underlines the advantages of this sustainable cycle.In the fifth part,this article presents a sustainable approach to heritage conservation and related legal safeguards by taking the renewal of historic houses in China’s Bagua Village(or"Eight Diagrams Village")as an example.In the last part,this paper summarizes the theoretical value,practical value and limitations of this article.The findings can facilitate the UN’s sustainable development of social inclusion,economic growth,and environmental protection to promote the heritage legislation and policy of present and future generations.展开更多
Allocation,dereferencing,and freeing of memory data in kernels are coherently linked.There widely exist real cases where the correctness of memory is compromised.This incorrectness in kernel memory brings about signif...Allocation,dereferencing,and freeing of memory data in kernels are coherently linked.There widely exist real cases where the correctness of memory is compromised.This incorrectness in kernel memory brings about significant security issues,e.g.,information leaking.Though memory allocation,dereferencing,and freeing are closely related,previous work failed to realize they are closely related.In this paper,we study the life-cycle of kernel memory,which consists of allocation,dereferencing,and freeing.Errors in them are called memory life-cycle(MLC)bugs.We propose an in-depth study of MLC bugs and implement a memory life-cycle bug sanitizer(MEBS)for MLC bug detection.Utilizing an interprocedural global call graph and novel identification approaches,MEBS can reveal memory allocation,dereferencing,and freeing sites in kernels.By constructing a modified define-use chain and examining the errors in the life-cycle,MLC bugs can be identified.Moreover,the experimental results on the latest kernels demonstrate that MEBS can effectively detect MLC bugs,and MEBS can be scaled to different kernels.More than 100 new bugs are exposed in Linux and FreeBSD,and 12 common vulnerabilities and exposures(CVE)are assigned.展开更多
通过弯曲法测量、热循环训练、扫描电镜、X射线衍射等方法,研究了复合稀土对Fe Mn Si Ni C合金形状记忆效应的影响。研究结果表明,Fe Mn Si Ni C合金中加入复合稀土,能够明显细化合金的金相组织,显著提高合金的形状记忆效应,并使合金表...通过弯曲法测量、热循环训练、扫描电镜、X射线衍射等方法,研究了复合稀土对Fe Mn Si Ni C合金形状记忆效应的影响。研究结果表明,Fe Mn Si Ni C合金中加入复合稀土,能够明显细化合金的金相组织,显著提高合金的形状记忆效应,并使合金表现出微弱的双程记忆效应。试验结果还表明,第一种训练途径以及加入微量复合稀土是降低应力诱发ε马氏体稳定化行之有效的方法,X射线衍射结果表明,该训练方法有助于提高合金中ε→γ转变的ε逆转变率,对提高合金的记忆性能起积极的作用。展开更多
文摘The menstrual cycle has been a topic of interest in relation to behavior and cognition for many years, with historical beliefs associating it with cognitive impairment. However, recent research has challenged these beliefs and suggested potential positive effects of the menstrual cycle on cognitive performance. Despite these emerging findings, there is still a lack of consensus regarding the impact of the menstrual cycle on cognition, particularly in domains such as spatial reasoning, visual memory, and numerical memory. Hence, this study aimed to explore the relationship between the menstrual cycle and cognitive performance in these specific domains. Previous studies have reported mixed findings, with some suggesting no significant association and others indicating potential differences across the menstrual cycle. To contribute to this body of knowledge, we explored the research question of whether the menstrual cycles have a significant effect on cognition, particularly in the domains of spatial reasoning, visual and numerical memory in a regionally diverse sample of menstruating females. A total of 30 menstruating females from mixed geographical backgrounds participated in the study, and a repeated measures design was used to assess their cognitive performance in two phases of the menstrual cycle: follicular and luteal. The results of the study revealed that while spatial reasoning was not significantly related to the menstrual cycle (p = 0.256), both visual and numerical memory had significant positive associations (p < 0.001) with the luteal phase. However, since the effect sizes were very small, the importance of this relationship might be commonly overestimated. Future studies could thus entail designs with larger sample sizes, including neuro-biological measures of menstrual stages, and consequently inform competent interventions and support systems.
文摘星间精密测距是导航星座实现自主导航的核心技术。针对导航星座中码测量值精度低但无整周模糊度,载波相位测量值精度高但存在整周模糊度的特点,该文根据贝叶斯递推原理提出了一种衰减记忆高斯和滤波(Fading Memory Gaussian Sum Filter,FMGSF)的伪距估计方法。该方法用高斯和形式近似表示系统后验概率密度,并根据卡尔曼滤波原理来更新高斯项的均值和方差,同时引入衰减记忆因子克服由于模型失配导致的滤波结果发散问题,利用重采样解决由于载波相位测量值不确定导致的算法复杂度增加问题。理论分析和仿真结果表明,该文提出的方法不仅能够克服周跳对伪距估计的影响,而且可以获得更好的测距精度。
基金This research was funded by the National Social Science Fund of China(20BH149)Shandong University Humanities and Social Sciences Innovation Team(Data Useand Data Governance Innovation in the Strategic Implementation of the Comprehensive Rule of Law).
文摘Historic preservation and heritage conservation are two mainstream concepts related to the sustainability and renewal of historic houses.With the aim of enhancing the sustainability of historic houses,this article criticizes the view of historic preservation that insists on preserving historic houses with their old appearances,which does not fully develop their sustainability.In contrast,the article provides support for the view of heritage conservation that aims to promote the sustainability of historic houses and related legislation.In the second and third parts,this article examines the theoretical origin of historic preservation,which emphasizes and summarizes the one-way protection of cultural memory via historic houses.In the fourth part,the article turns to heritage conservation,highlights the sustainable cycle between historic houses and cultural memory,and underlines the advantages of this sustainable cycle.In the fifth part,this article presents a sustainable approach to heritage conservation and related legal safeguards by taking the renewal of historic houses in China’s Bagua Village(or"Eight Diagrams Village")as an example.In the last part,this paper summarizes the theoretical value,practical value and limitations of this article.The findings can facilitate the UN’s sustainable development of social inclusion,economic growth,and environmental protection to promote the heritage legislation and policy of present and future generations.
基金supported by the National High-Level Personnel for Defense Technology Program of China under Grant No.2017-JCJQ-ZQ-013the National Natural Science Foundation of China under Grant Nos.61902405 and 61902412+2 种基金the Natural Science Foundation of Hunan Province of China under Grant No.2021JJ40692the Parallel and Distributed Processing Research Foundation under Grant No.6142110190404the Research Project of National University of Defense Technology under Grant Nos.ZK20-09 and ZK20-17.
文摘Allocation,dereferencing,and freeing of memory data in kernels are coherently linked.There widely exist real cases where the correctness of memory is compromised.This incorrectness in kernel memory brings about significant security issues,e.g.,information leaking.Though memory allocation,dereferencing,and freeing are closely related,previous work failed to realize they are closely related.In this paper,we study the life-cycle of kernel memory,which consists of allocation,dereferencing,and freeing.Errors in them are called memory life-cycle(MLC)bugs.We propose an in-depth study of MLC bugs and implement a memory life-cycle bug sanitizer(MEBS)for MLC bug detection.Utilizing an interprocedural global call graph and novel identification approaches,MEBS can reveal memory allocation,dereferencing,and freeing sites in kernels.By constructing a modified define-use chain and examining the errors in the life-cycle,MLC bugs can be identified.Moreover,the experimental results on the latest kernels demonstrate that MEBS can effectively detect MLC bugs,and MEBS can be scaled to different kernels.More than 100 new bugs are exposed in Linux and FreeBSD,and 12 common vulnerabilities and exposures(CVE)are assigned.
文摘通过弯曲法测量、热循环训练、扫描电镜、X射线衍射等方法,研究了复合稀土对Fe Mn Si Ni C合金形状记忆效应的影响。研究结果表明,Fe Mn Si Ni C合金中加入复合稀土,能够明显细化合金的金相组织,显著提高合金的形状记忆效应,并使合金表现出微弱的双程记忆效应。试验结果还表明,第一种训练途径以及加入微量复合稀土是降低应力诱发ε马氏体稳定化行之有效的方法,X射线衍射结果表明,该训练方法有助于提高合金中ε→γ转变的ε逆转变率,对提高合金的记忆性能起积极的作用。
