共查询到20条相似文献，搜索用时 312 毫秒
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[目的/意义]随着国民经济的持续增长,人们的消费从物质需求转向精神需求,移动音乐平台的发展迎来新的增长点。本文基于PPM模型,以网易云音乐为研究对象,通过实证方法分析用户在移动音乐平台之间的转移行为。[方法/过程]本文将不满意度作为推动因素（Push Factor）,将财务转移成本和关系转移成本作为锚定因素（Mooring Factor）,将网络义务性和相对匮乏性作为拉动因素（Pull Factor）,假设其对用户的转移过程有影响,其中相对匮乏性由情感相对匮乏性、经济相对匮乏性和功能相对匮乏性所反映。[结果/结论]结果显示,不满意度、网络义务性和相对匮乏性都正向显著影响移动音乐平台用户的转移意愿,且用户的转移意愿正向显著影响其实际转移行为,而转移成本则对用户的转移意愿无显著影响。 相似文献
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在发达国家特别是在美国,国家实验室以及类似的公共创新平台经历了长期的发展,在整个科技创新体系和创新生态中一直扮演着十分重要的角色。本文以技术转移效率理论作为分析框架,分析了当前国家实验室技术转移研究的进展,对国家实验室技术转移的各个模式进行了分类及评价。另外,在现有文献综述的基础上,本文还梳理总结了可能影响国家实验室技术转移的因素,并归纳梳理了国家实验室技术转移的影响因素与不同转移模式之间存在的关联,从而为指导下一步研究奠定了基础。最后,本文总结我国需要推进国家实验室技术转移的实证研究,并且指出价值网络扩散会是国家实验室技术转移模式的未来发展方向,需要进一步关注。 相似文献
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中国省际技术转移:空间关联与内生演化机制 《科学学研究》2023,41(1):38-50
建设和完善国家技术转移体系,对于促进科技成果转化,激发社会创新活力,提升国家创新实力具有重要意义。本文利用2008-2019年省际专利权转移转让数据,构建了中国省际技术转移网络,运用社会网络分析和时间指数随机图模型,研究网络的空间关联特征及内生演化机制。结果发现：(1)中国省际技术转移关系日益密切,技术转移体系日趋完善,但省份间的互惠性有待提高。(2)中国省际技术转移网络存在结构依赖效应,省份间的聚敛性、传递性以及闭合性特征明显,但省份间的积极性有待提高。(3)中国省际技术转移网络存在时间依赖效应,路径依赖与路径创造并存。本研究推动了对省际技术转移的认识,对加快构建国内技术转移大循环新格局具有重要启示。 相似文献
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本文对于"李约瑟难题"从学者关注的层次、时间以及关注者身份方面进行了分析,作者认为对该难题的关注有一个从解题到解构重心上的转移;之后作者从4个方面对中国人关注"李约瑟难题"的原因进行了探讨,认为随着对"李约瑟难题"关注重心的转移,对该难题的关注也将逐渐淡化或转移。 相似文献
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Dean Karnopp 《Journal of The Franklin Institute》1983,316(5):405-415
There is a strong analogy between mechanical structural elements and magnetic circuit components which can be extended to include hysteretic energy losses associated with yielding in mechanical systems and saturation in magnetic components. Procedures for developing finite state models of hysteretic components are presented using a small number of basic elements. Using bond graph techniques, it is shown that, when dual structural models are used, elements may be assembled in arbitrary numbers to achieve any desired accuracy without problems of derivative causality. The reason for the dual structure can be seen from physical reasoning. The shape of the hysteresis curve for magnetic materials generally requires more elements for a given degree of approximation than the shape of the typical mechanical hysteresis curve. 相似文献
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本文以Gonzalez的线性小角度近似公式为例,提出跳出数学推导近似公式的惯性思维,在原有理论推导所得近似公式的基础上,尝试修改某些系数来进一步提高近似效果的新思想,并且运用这一新思想得出了同形式下,优于Gonzalez的新P-SV波线性小角度近似公式。 相似文献
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在FPGA硬件神经网络设计中激活函数的实现和数据表示方式是两个难点。本文提出了用非线性函数和21位定点法相结合来实现激活函数的逼近算法,采用源码定点表示法实现数据的硬件表示,明显减少了FPGA的资源占用,降低了激活函数逼近算法的复杂性和实现难度,最后,给出实际FPGA硬件神经网络设计实例并进行了仿真验证。 相似文献
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《Journal of The Franklin Institute》2023,360(7):4807-4829
The Discrete Tchebichef Transform (DTT) is widely used in signal processing applications such as image and video compression and digital watermarking due to its coding and decorrelation properties. In embedded systems and real-time applications, the need for fast, low complexity, and energy efficient algorithms is increasingly important. However, there is a limited number of such algorithms available for efficient computation of the DTT compared to the discrete cosine transform. To address this issue, a new DTT approximation is proposed, which provides a low-complexity and efficient solution by exploiting the deviation from orthogonality. The suggested algorithm requires fewer additions and bit-shifting operations compared to the existing ones. The implementation of this DTT approximation on the Xilinx Virtex-6 XC6VSX475T-1FF1759-2 FPGA resulted in a 19.20% decrease in hardware resources and 2% reduction in energy consumption for 1-D 8 inputs compared to the best candidate DTT approximation. With a low deviation from orthogonality, the efficiency of the proposed approximation has been confirmed in image compression and digital watermarking. The experimental results show an average quality improvement of 0.25 dB over the latest DTT approximation. 相似文献
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《Journal of The Franklin Institute》2023,360(7):5082-5091
In this article, an adaptive tracking control approach using Bernstein polynomial approximation is firstly proposed for an unknown nonlinear dynamic system. Bernstein polynomial approximation aims to compensate the unknown nonlinear dynamic function. However, if Bernstein theorem is directly used, the Bernstein polynomial's coefficients need to be derived from the system dynamic function. Nevertheless, the dynamic function is presumed to be unknown, hence the polynomial approximation still cannot be used for designing this control. In order to obtain the available function approximation, adaptive strategy is considered to estimate these coefficients. Finally, by learning from the classical adaptive algorithm, the undetermined coefficient problem is addressed, so that the valid tracking control is found for the unknown nonlinear dynamic system. According to Lyapunov stability analysis and simulation experiment, it is concluded that the new adaptive scheme can realize the control objective. 相似文献
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在模型简化、图像处理和分析、模式识别以及计算机视觉等应用中常常涉及到数字曲线的多边形逼近问题。对该问题的国内外研究成果进行了较为系统地介绍,对一些典型算法的优缺点进行了分析,对相关技术的发展进行了展望。 相似文献
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《Journal of The Franklin Institute》2022,359(7):2906-2931
This paper concentrates on proposing a novel finite-time tracking control algorithm for a kind of nonlinear systems with input quantization and unknown control directions. The nonlinear functions in the system are approximated by the means of strong approximation capability of the fuzzy logic systems. Firstly, the nonlinear system with unknown control directions is transformed into an equivalent system with known control gains by coordinate transformation. Secondly, the unknown system states are estimated by a designed fuzzy state observer, and the disturbance observer is constructed to track the external disturbances. The command filtering method is proposed to approach the problem of “explosion of complexity” existed in the conventional backstepping design process. In this system, the difficulties caused by unknown control directions are solved via the Nussbaum gain approach. Finally, based on the fuzzy state observer, the controller of the original system is obtained via using the transformed system by the backstepping method. The boundedness of all signals and the convergence of tracking and observer errors at the origin are ensured for the closed-loop system, and demonstrated by the simulation result in this paper. 相似文献