居住性历史街区保护与更新的若干理论探讨     

林翔 《福建工程学院学报》2008,6(6)

在对居住性历史街区概念界定的基础上,结合相关文献,探讨了街区保护的动态历史观,基于可持续发展和有机再生的理论基础,提出了整体保护和动态保护、小规模渐进式、社会生活结构延续性、公众参与的保护更新原则。  相似文献   

概率方法在解决实际问题中的应用     

袁德强  袁静 《牡丹江教育学院学报》2008,(4)

举例说明如何利用概率论和随机过程的相关知识建立目标函数,求出最优值来解决实际问题。  相似文献   

A cross-layer design approach on spectrum allocation and resource scheduling in cognitive PMP networks     

Jie Chen  Min-jian Zhao  Qiao Zhou  Shi-ju Li 《浙江大学学报(A卷英文版)》2008,9(4):435-444

We propose the spectrum allocation and resource scheduling algorithms in cognitive point to multipoint （PMP） networks with rapid changes of spectrum opportunities and present a media access control （MAC） protocol based on these algorithms. The objective of spectrum allocation is to make efficient use of the spectrum while maintaining the transceiver synchronization on frequency and time in the network. The objective of resource scheduling is to guarantee the quality of service （QoS） requirements of different kinds of connections and to minimize the total energy consumption in the network as well. By sensing only a small set of possible channels in each slot based on the state transition probability of each channel, our spectrum allocation algorithm achieves high spectrum efficiency in the network. The resource scheduling problem is divided into three sub problems and we derive optimal solutions to these problems by greedy algorithm and convex optimization. The simulation results show that our algorithm can make efficient use of the spectrum and the network resources at a cost of low computational complexity.  相似文献   

晚期折返过程含石墨流体包裹体及其意义：以印度两个不同地体为例     

M.K.Panigrahi S.Gupta 《中国科技期刊研究》2007,23(1):53-64

  相似文献   

大数据时代大学生自主学习能力预测研究     

郝水侠  付敏 《教育技术导刊》2021,19(12):32-37

大数据时代知识增长速度呈指数级增长,提升大学生自主学习能力迫在眉睫。根据大学生自主学习能力调查问卷,利用马尔可夫链构建大学生自主学习能力预测模型,通过模糊综合评判法对大学生自主学习能力进行评估,并对实验结果进行分析比较,给出不同年级、不同性别以及学习动机对自主学习能力的影响,最后给出大学生提升自主学习能力的方法与建议。  相似文献   

The Rise of the Creative Underclass     

Tyler Denmead 《Educational theory》2019,69(2):225-240

In this article, Tyler Denmead draws upon critical race theory to argue that the creative city discourse reproduces racial injustice for youth. In particular, the creative city invests in the property rights and profitability of whiteness by inscribing creative superiority on the bodies of young people who are more likely to be privileged by virtue of their race and class. Through evidence collected by both autoethnographic and ethnographic methods, Denmead discusses how his history as an arts educator has been entangled in the manifestation of this racist reconfiguration of urban space in one particular American city, Providence, Rhode Island. He discovered that the racial dynamics of the creative city discourse have productive power over how young people construct their identities and make life choices in this city and, further, that those dynamics operate in and through artist partnerships between those positioned as creatives and those positioned as troubled youth. As a result, Denmead argues that white arts educators, in particular, must disinvest themselves from notions of creativity that enhance the profitability and power of whiteness. This move requires advocating ceding land and resources that have been acquired through the creative city discourse and committing to reframing culture‐led urban renewal in terms of the economic and creative flourishing of communities of color.  相似文献   

遗传算法的收敛性研究     

屠昂燕  陈建成 《培训与研究》2008,25(2):49-51

通过马尔可夫链方法,分析种群在解空间上概率分布情况以及收敛到最优解的概率,证明经典GA是不会收敛到最优解的,若在GA中保留每一代的最佳个体,则可以收敛到最优解。讨论全局收敛和过早收敛的原因,最后提出GA操作中应遵循的原则是改进GA搜索性能的关键。  相似文献   

TDD-CDMA 系统中基于业务统计的联合功率控制算法     

陈波  戎蒙恬  胡威 《上海大学学报(英文版)》2008,12(5):414-418

An important feature of the traffic in mobile networks is burstiness. Drawbacks of conventional power control algorithms for time division duplex （TDD）-code division multiple access （CDMA） systems are analyzed. A joint power control algorithm based on service factor is presented to address the TDD-CDMA mobile services in the burst mode according to the Markov modulated Bernoulli process. The joint power control equation is derived. A function model is developed to verify the new algorithm and evaluate its performance. Simulation results show that the new power control algorithm can estimate interference strength more precisely, speed up convergence of power control, and enhance power efficiency and system capacity. It is shown that the proposed algorithm is more robust against link gain changes, and outperforms the reference algorithms.  相似文献   

Markov链在生命科学中的应用     

付君丽 《保定师专学报》2008,(4):28-30

通过Markov链理论,为生命科学中物种的灭绝及种群繁殖过程中的分支过程及两性G-W分支过程建立数学模型,并辅以实例加以定性分析和研究.  相似文献   

Facilitating cognitive processes during EFL smartwatch-supported learning activities in authentic contexts     

Rustam Shadiev  Wu-Yuin Hwang  Tzu-Yu Liu 《British journal of educational technology : journal of the Council for Educational Technology》2021,52(3):1230-1243

  相似文献