Perceptually Grounded Language Learning: Part 2—DETE: A Neural/Procedural Model

In Part 1 of this two-part series, we introduced Katamic memory—a neural network architecture capable of robust sequence learning and recognition. In Part 2, we introduce the Blobs World taskjdomain for language learning and describe the DETE language learning system, which is composed of over 50 Katamic memory modules. DETE currently learns small subsets of English and Spanish via association with perceptual! motor inputs. In addition to Kaiamic memory, DETE employs several other novel features: (1) use of feature planes, to encode visual shapes, spatial relationships and the motions of objects, (2) phase-locking of neural firing, in order to represent focus of atention and to bind objects across multiple feature planes, and (3) a method for encoding temporal relationships, so that DETE can learn utterances involving the immediate past and future. We compare DETE to related models and discuss the implications of this approach for language-learning research.     

交流采样综合电量变送器的算法和误差分析

本文介绍了一种交流采样综合电量变送器的测量算法和设计技术要点，分析了仪表的误差来源：通道传输误差、电流互感器非线性误差、相位误差和频率混叠误差。论文提出了提高锁相同步的精度、减小通道误差和频率混叠等误差的方法。由于仪表采用了具有高Q模拟低通滤波器的锁相同步技术、内部动态校准与外校准相结合的免调整技术、采用较高的采样率和抗混叠滤波、相位补偿等技术，从而保证了仪表能适应谐波畸变严重的电网，并有良好的温度适应性。几项关键技术尚未见在国内其它的微机电量变送器中使用。     

约瑟夫森阵列振荡器的相位锁定分析

系统地研究了超导亚毫米波阵列振荡器的相位锁定问题。为使超导振荡器达到高工作频率、窄线宽和高稳定的性能，约瑟夫森结与结之间的相位必须相互锁定。相位锁定可以通过结与结之间的耦合电路得以实现。通过对振荡器的各种耦合电路的比较表明，蝴蝶领结天线结构是一个比较适合约瑟夫森振荡器相位锁定的耦合电路。本文提出了一种超导亚毫米波阵列振荡器模型并对其进行了模拟计算与分析，仿真得出了振荡器各项参数值，并给出了相位锁定的条件。     

C波段磁控管注入锁相的实验研究

为了对C波段磁控管进行大功率功率合成,须进行单管锁相研究,本文主要对单管磁控管进行注入锁相实验研究,并讨论了不同注入功率大小对磁控管输出频谱带宽的影响.实验结果表明,通过注入外部信号的方式对C波段磁控管是能够锁相成功的,锁相后输出功率稳定.在实验过程中取得了大量的试验数据,为下一步功率合成实验提供了实验基础.     

光纤激光合成技术研究新进展

介绍了目前国内外光纤激光器合成技术的最新进展，分析了几种流行的非相干和相干合成技术方法，指出了其优缺点，最后对光纤激光器相干合成技术的发展作了展望。     

光纤激光阵列锁相和孔径装填技术研究进展

介绍了几种典型的激光阵列锁相和孔径装填技术,重点综述了国内外光纤激光阵列锁相和孔径装填技术的研究进展,最后对高功率高光束质量激光光源的应用和发展前景进行了展望.     

3kW可调度型并网逆变器的研制

3kW可调度型并网逆变器采用80C196 16位单片机配合D／A转换和MOSFET功率模块实现SPWM正弦脉宽调制、电流同步跟踪、并网逆变／独立逆变的切抑控制等功能。本机设计为带有蓄电池“可调度型”并网逆变器,目的是提高光伏并网系统的实用性和调峰能力,电力部门可以根据当地电网的峰,谷期和实际需要,通过遥控方式将光伏系统进入或退出电网;当电网停电时,并网逆变器还可以自动转入“独立逆变方式”为用户供电。     

高功率相对论磁控管注入式锁相条件的研究

在经典锁相理论Adler 条件基础上,考虑到相对论磁控管互作用空间内高度非线性的束波互作用,用粒子模拟方法得出了磁控管注入式锁相模型的注入比和频率差的参数区域图,研究了注入比和频率差对锁相的影响。模拟结果表明,在相对论磁控管的谐振频率为2.4667GHz 情况下,当注入比为0.25、频率差为35MHz 或20MHz、注入比为0.15 都可以实现稳定锁相。在此基础上对经典的Adler 条件引入了非线性参数修正,其取值与器件工作时的非线性程度有关,基于本文模型得到的非线性参数约为7,可见修正后的理论结果比经典理论结果允许有更大的锁相范围。     

一种新的频率跟踪技术

提出一种新的频率跟踪技术———数字式无暂态频率跟踪器 ,该技术采用数字逻辑电路实现了频率精确同步跟踪 ,具有电路简单、输入输出频率关系可调、没有暂态过程等优点 ,在电子技术和现代通信等科技领域具有广泛的应用前景。     

Resonance and the Perception of Musical Meter

Many connectionist approaches to musical expectancy and music composition let the question of ‘What next?’ overshadow the equally important question of ‘When next?’. One cannot escape the latter question, one of temporal structure, when considering the perception of musical meter. We view the perception of metrical structure as a dynamic process where the temporal organization of external musical events synchronizes, or entrains, a listener's internal processing mechanisms. This article introduces a novel connectionist unit, based upon a mathematical model of entrainment, capable of phase- and frequency-locking to periodic components of incoming rhythmic patterns. Networks of these units can self-organize temporally structured responses to rhythmic patterns. The resulting network behavior embodies the perception of metrical structure. The article concludes with a discussion of the implications of our approach for theories of metrical structure and musical expectancy.