By establishing the connection between graph colouring and the solution of some equation systems in finite fields, we obtain some formulas to the number of solutions of some equation systems in finite fields, in terms...By establishing the connection between graph colouring and the solution of some equation systems in finite fields, we obtain some formulas to the number of solutions of some equation systems in finite fields, in terms of chromatic polynomial of a graph.展开更多
A new stereo matching scheme from image pairs based on graph cuts is given,which can solve the problem of large color differences as the result of fusing matching results of graph cuts from different color spaces.This...A new stereo matching scheme from image pairs based on graph cuts is given,which can solve the problem of large color differences as the result of fusing matching results of graph cuts from different color spaces.This scheme builds normalized histogram and reference histogram from matching results,and uses clustering algorithm to process the two histograms.Region histogram statistical method is adopted to retrieve depth data to achieve final matching results.Regular stereo matching library is used to verify this scheme,and experiments reported in this paper support availability of this method for automatic image processing.This scheme renounces the step of manual selection for adaptive color space and can obtain stable matching results.The whole procedure can be executed automatically and improve the integration level of image analysis process.展开更多
鉴于中国南方古稻作梯田作为全球重要农业文化遗产的独特地位及其对生态系统服务、生物多样性保护及农业可持续发展的重要意义,文章采用文献计量分析方法,系统梳理了Web of Science及CNKI数据库中该领域相关的国内外文献,旨在全面评估...鉴于中国南方古稻作梯田作为全球重要农业文化遗产的独特地位及其对生态系统服务、生物多样性保护及农业可持续发展的重要意义,文章采用文献计量分析方法,系统梳理了Web of Science及CNKI数据库中该领域相关的国内外文献,旨在全面评估该领域研究现状并探索其未来发展路径。研究发现:(1)国内在该领域的研究分为初步发展期和快速发展与繁荣期两个阶段,不同时期的研究内容也不相同;国际学术界在该研究领域尚处于逐渐升温的阶段;(2)当前形成的合作群体多以导师与学生之间的紧密合作为主,但各研究力量间的合作尚显不足;(3)该领域的研究内容广泛,涉及自然、社会、经济、文化等多维度,涵盖梯田文化、遗产保护、水稻土等,聚焦于生态系统服务、生物多样性保护、水土保持与农业可持续发展以及梯田撂荒问题等。本研究同时揭示了当前研究存在的空白点,为增强跨学科、跨机构的合作和推动梯田生态、文化及经济的综合可持续发展提供重要的研究依据和策略方向。展开更多
针对同步定位与建图(simultaneous localization and mapping,SLAM)技术对计算资源的高需求、有限环境适应性、累积误差问题、系统复杂度高、成本昂贵、大场景处理能力受限以及缺乏有效的回环检测机制的缺点,提出一种结合人工势场法和...针对同步定位与建图(simultaneous localization and mapping,SLAM)技术对计算资源的高需求、有限环境适应性、累积误差问题、系统复杂度高、成本昂贵、大场景处理能力受限以及缺乏有效的回环检测机制的缺点,提出一种结合人工势场法和深度强化学习的方法。利用图论模拟人工势场在机器人间的相互作用以及机器人与目的地之间的势场力,并采用孪生延迟深度确定性策略梯度(twin delayed deep deterministic policy gradient,TD3)算法来优化机器人对障碍物信息的感知和处理。仿真试验结果表明:该方法使机器人能够在未知环境中快速、准确地进行定位、移动,同时维持队形的稳定性和一致性。展开更多
Let p be a prime and K be a number field with non-trivial p-class group ClpK. A crucial step in identifying the Galois group G∞p of the maximal unramified pro-p extension of K is to determine its two-stage approximat...Let p be a prime and K be a number field with non-trivial p-class group ClpK. A crucial step in identifying the Galois group G∞p of the maximal unramified pro-p extension of K is to determine its two-stage approximation M=G2pk, that is the second derived quotient M≃G/Gn. The family τ1K of abelian type invariants of the p-class groups ClpL of all unramified cyclic extensions L/K of degree p is called the index- abelianization data (IPAD) of K. It is able to specify a finite batch of contestants for the second p-class group M of K. In this paper we introduce two different kinds of generalized IPADs for obtaining more sophisticated results. The multi-layered IPAD (τ1Kτ(2)K) includes data on unramified abelian extensions L/K of degree p2 and enables sharper bounds for the order of M in the case Clpk≃(p,p,p), where current im-plementations of the p-group generation algorithm fail to produce explicit contestants for M , due to memory limitations. The iterated IPAD of second order τ(2)K contains information on non-abelian unramified extensions L/K of degree p2, or even p3, and admits the identification of the p-class tower group G for various infinite series of quadratic fields K=Q(√d) with ClpK≃(p,p) possessing a p-class field tower of exact length lpK=3 as a striking novelty.展开更多
文摘By establishing the connection between graph colouring and the solution of some equation systems in finite fields, we obtain some formulas to the number of solutions of some equation systems in finite fields, in terms of chromatic polynomial of a graph.
基金Sponsored by"985"Second Procession Construction of Ministry of Education(3040012040101)
文摘A new stereo matching scheme from image pairs based on graph cuts is given,which can solve the problem of large color differences as the result of fusing matching results of graph cuts from different color spaces.This scheme builds normalized histogram and reference histogram from matching results,and uses clustering algorithm to process the two histograms.Region histogram statistical method is adopted to retrieve depth data to achieve final matching results.Regular stereo matching library is used to verify this scheme,and experiments reported in this paper support availability of this method for automatic image processing.This scheme renounces the step of manual selection for adaptive color space and can obtain stable matching results.The whole procedure can be executed automatically and improve the integration level of image analysis process.
文摘鉴于中国南方古稻作梯田作为全球重要农业文化遗产的独特地位及其对生态系统服务、生物多样性保护及农业可持续发展的重要意义,文章采用文献计量分析方法,系统梳理了Web of Science及CNKI数据库中该领域相关的国内外文献,旨在全面评估该领域研究现状并探索其未来发展路径。研究发现:(1)国内在该领域的研究分为初步发展期和快速发展与繁荣期两个阶段,不同时期的研究内容也不相同;国际学术界在该研究领域尚处于逐渐升温的阶段;(2)当前形成的合作群体多以导师与学生之间的紧密合作为主,但各研究力量间的合作尚显不足;(3)该领域的研究内容广泛,涉及自然、社会、经济、文化等多维度,涵盖梯田文化、遗产保护、水稻土等,聚焦于生态系统服务、生物多样性保护、水土保持与农业可持续发展以及梯田撂荒问题等。本研究同时揭示了当前研究存在的空白点,为增强跨学科、跨机构的合作和推动梯田生态、文化及经济的综合可持续发展提供重要的研究依据和策略方向。
文摘针对同步定位与建图(simultaneous localization and mapping,SLAM)技术对计算资源的高需求、有限环境适应性、累积误差问题、系统复杂度高、成本昂贵、大场景处理能力受限以及缺乏有效的回环检测机制的缺点,提出一种结合人工势场法和深度强化学习的方法。利用图论模拟人工势场在机器人间的相互作用以及机器人与目的地之间的势场力,并采用孪生延迟深度确定性策略梯度(twin delayed deep deterministic policy gradient,TD3)算法来优化机器人对障碍物信息的感知和处理。仿真试验结果表明:该方法使机器人能够在未知环境中快速、准确地进行定位、移动,同时维持队形的稳定性和一致性。
文摘Let p be a prime and K be a number field with non-trivial p-class group ClpK. A crucial step in identifying the Galois group G∞p of the maximal unramified pro-p extension of K is to determine its two-stage approximation M=G2pk, that is the second derived quotient M≃G/Gn. The family τ1K of abelian type invariants of the p-class groups ClpL of all unramified cyclic extensions L/K of degree p is called the index- abelianization data (IPAD) of K. It is able to specify a finite batch of contestants for the second p-class group M of K. In this paper we introduce two different kinds of generalized IPADs for obtaining more sophisticated results. The multi-layered IPAD (τ1Kτ(2)K) includes data on unramified abelian extensions L/K of degree p2 and enables sharper bounds for the order of M in the case Clpk≃(p,p,p), where current im-plementations of the p-group generation algorithm fail to produce explicit contestants for M , due to memory limitations. The iterated IPAD of second order τ(2)K contains information on non-abelian unramified extensions L/K of degree p2, or even p3, and admits the identification of the p-class tower group G for various infinite series of quadratic fields K=Q(√d) with ClpK≃(p,p) possessing a p-class field tower of exact length lpK=3 as a striking novelty.
