Winner-Takes-All Associative Memory: A Hamming Distance Vector Quantizer

We present a design methodology for mapping neuralyinspired algorithms for vector quantization, into VLSI hardware.We describe the building blocks used: memory cells, current conveyors,and translinear circuits. We use the basic building blocks todesign an associative processor for bit-pattern classification;a high-density memory based neuromorphic processor. Operatingin parallel, the single chip system determines the closest match,based on the Hamming distance, between an input bit pattern andmultiple stored bit templates; ties are broken arbitrarily. Energyefficient processing is achieved through a precision-on-demandarchitecture. Scalable storage and processing is achieved througha compact six transistor static RAM cell/ALU circuit. The singlechip system is programmable for template sets of up to 124 bitsper template and can store up to 116 templates (total storagecapacity of 14 Kbits). An additional 604 bits of auxiliary storageis used for pipelining and fault tolerance re-configuration capability.A fully functional 6.8 mm by 6.9 mmchip has been fabricated in a standard single–poly, double–metal2.0µmn–well CMOS process.     

CF4预处理后热生长薄栅氧漏电流及势垒研究

嵌入式Flash Memory要求低的工作电压．采用反应离子刻蚀技术，用CF4气体在低功率下对硅片做预处理，再热生长薄氧化层，从而在氧化层中引入F，降低氧化层势垒:势垒高度从3.05eV降低到2.5eV，隧穿电流增加，从而可以在低压下提高Flash Memory的编程效率．     

Modelling of flow pattern in a shallow aquifer affected by reservoirs

A compartmental model is developed to estimate flow parameters of a shallow aquifer affected by water loads in surface reservoirs and to evaluate its nonsteady flow distribution. The method incorporates temporal piezometric head measurements and sampling of water for dissolved chemicals and isotopes analyses. Each compartment is governed by a set of equations describing the conservation of linear momentum and mass balance expressions for water, isotopes, and dissolved chemicals. The number of compartmental balance expressions always must be greater than that of the unknown flow parameters associated with each compartment. An optimization method is described to yield spatial distribution of aquifer storativity, transmissivity, porosity, leakage, and compliance coefficients and fluxes leaking into an aquifer's lower boundary. Future predictions of an aquifer's piezometric head distribution in a compartmental system is formulated on the basis of the estimated flow parameters and the leakage components.Compartmental modelling which incorporates concentrations of environmental tracers, may yield efficiency in computing resources and accuracy enhancement for predicting an aquifer's flow regime.     

Stochastic Analysis of Macrodispersion in a Semi‐Confined Aquifer

In this paper, the macroscopic dispersion resulting from one and twodimensional flows through a semiconfined aquifer with spatially variable hydraulic conductivity K which is represented by a stationary (statistically homogeneous) random process is analyzed using the spectral representation technique. Stochastic fluctuation equations of the steady flow and solute transport are solved to construct the macroscopic dispersive flux and evaluate the resulting macrodispersivity tensor in terms of the leakage factor and input covariances describing the hydraulic conductivity in a semiconfined aquifer bounded by a leaky layer above and an impervious stratum below. The macrodispersivity tensor is studied using some convenient forms of the log hydraulic conductivity process. The sensitivity of the resulting macrodispersivity to the input covariances is discussed along with the influence of the leakage factor for both one and twodimensional flows. It is found that the longitudinal macrodispersivities are increased due to the presence of leakage, while the transverse macrodispersivities are reduced due to leakage.     

300 W侧面分布式抽运掺Yb全光纤放大器

采用角度磨抛的方式, 在纤芯/包层为20/400 μm双包层掺Yb光纤上制作了侧面抽运耦合器. 该耦合器对975 nm的半导体二极管抽运光的耦合效率最高可达97%, 对1080 nm信号光的泄漏比小于2%. 分析了侧面抽运耦合器的性能以及多个侧面抽运耦合器的级联分布对抽运耦合效率的影响; 同时, 在前向抽运和双向抽运方式下, 分析了级联耦合器的分布及信号光泄漏比对激光器整体效率的影响, 并进行了数值模拟. 采用自行研制的侧面抽运耦合器, 搭建了侧面耦合分布式抽运、掺Yb双包层全光纤主振荡功率放大器, 获得了波长为1080 nm、功率为303 W 的基模激光输出. 进一步增加抽运点个数, 提高抽运功率, 可获得更高的输出功率.     

矿用道岔控制器按钮电路安全性分析与设计

介绍了一种矿用道岔控制器的按钮电路,通过对现有按钮控制方式的隐患分析与电路改进设计,阐述了其存在隐患的设计对策。通过对按钮线路绝缘阻抗特性分析,结合线路绝缘检测技术,设计实现了具有绝缘检测功能的按钮线路漏电监督电路,解决了因按钮线路漏电引起的误动作驱动,从而实现了道岔控制器的安全可靠工作。     

低漏电常闭型光电隔离开关设计

研制了一种新型的低漏电常闭型光电隔离开关。介绍了该光电隔离开关的工作原理、参数设计。通过特别的结构设计实现了对微小漏电流的控制,并对其进行了工艺改进,提高了器件可靠性。器件测试结果显示,参数指标达到设计值,从而验证了设计的有效性。     

调频信号隧道覆盖技术研究

对调频信号隧道覆盖技术进行了研究,从信源、近端机、远端机、天馈等四个环节进行了技术分析,得出系统覆盖所需功率的计算公式,并从实践得出调频信号隧道覆盖时需考虑的重要因素,最后介绍了杭州调频信号隧道覆盖一期项目的情况,并对项目实施过程中出现的问题进行了总结。     

长距离磁路传输电能系统之磁路分析

提出一种新的传输电能的系统,即长距离磁路传输电能系统,长距离磁路是指距离在400km以上的闭合磁路。通过磁路分析的第一类方法及第二类方法对该系统的磁路结构及系统参数进行了分析,验证了该新的系统的合理性,为电能传输方式提供新的思路并进行了有益的探索。但还有诸如恒定磁场如何取电的问题有待进一步研究。