Connectionist Finite State Natural Language Processing

Unless one is prepared to argue that existing, ‘classical’formal language and automata theory, together with the natural language linguistics built on them, are fundamentally mistaken about the nature of language, any viable connectionist natural language processing (NLP) model will have to be characterizable, at least approximately, by some generative grammar or by an automaton of the corresponding class. An obvious way of ensuring that a connectionist NLP device is so characterizable is to specify it in classical terms and then to implement it in an artificial neural network, and that is what this paper does. It adopts the deterministic pushdown transducer (DPDT) as an adequate formal model for general NLP and shows how a simple recurrent network (SRN) can be trained to implement a finite state transducer (FST) which simulates the DPDT. A computer simulation of a parser for a small fragment of English is used to study the properties of the model. The conclusion is that such SRN implementation results in a device which is broadly consistent with its classical specification, but also has emergent properties relative to that specification which are desirable in an NLP device.     

Connectionism and Determinism in a Syntactic Parser

The processing of natural language is, at the same time, naturally symbolic and naturally subsymbolic. It is symbolic because ultimately symbols play a critical role. Writing systems, for example, owe their existence to the symbolic nature of language. It is also subsymbolic because of the nature of speech, the fuzziness of concepts, and the high degree of parallelism that is difficult to explain as a purely symbolic phenomenon. Building a processor of natural language, therefore, requires a hybrid approach. This report details a set of experiments which support the claim that natural language can be syntactically processed in a robust manner using a connectionist deterministic parser. The model is trained from patterns derived from a deterministic grammar and tested with grammatical, ungrammatical and lexically ambiguous sentences.     

功率超声细化Sn-Sb合金凝固组织工艺研究

通过金相组织分析和力学性能实验,研究了不同的功率超声处理工艺对Sn-Sb合金凝固组织和力学性能的影响,分析了功率超声空化和声流在凝固过程中的作用情况,得出了功率超声最佳的处理工艺,并对超声波的空化和声流作用在金属凝固过程中的变化情况进行了论述。     

"THERMO": COMPUTER PROGRAM FOR SIMULATION OF SURFACE PULSE HEATING

1.IntroductionTheoneofthemostimportantparametersofthethermalcycleduringsurfacepulseheatingistherateofheatingandcooling.Knowledgeofthesevaluesinparticulartemperatureintervalshelpstoprognosticatephasestructureintheheataffectedzones(HAZ),toanalyzecausesofthestructuretransformations.Todaythereisavoluminousliteratureoncalculationofthethermalconditionsforasolidduringsurfaceprocessing.Butthetemperaturevariationsareusuallyexaminedasafunctionoftimeorspacecoordinates.Sometimesthefirstderivativeofthete…     

磁力研磨在模具型腔精加工的应用

提出一种新的模具型腔精加工方法———磁力研磨法 ,并对该方法在模具型腔精加工中的应用给予了充分的论证 ,同时对影响磁力研磨的一些因素进行了讨论 ,提出了该技术在模具精加工中的应用前景     

人工神经网络技术在无损检测中的应用

介绍神经网络技术在无损检测领域的应用现状 ,包括神经网络技术应用于设备缺陷特征的确定和设备缺陷评判、设备运行的状态监测以及数据融合等 ,并对这项技术在无损检测中的进一步应用作了展望     

焊缝的主动红外线成像检测技术

提出了一种以红外光源照射焊缝，CCD摄取图像，通过计算机对图像进行分析处理，提取焊缝的长度、宽度和偏心距的方法。该方法检测精度高，算法速度快，可以实时运用于对手工电弧焊进行漏焊检测。     

Machining accuracy for shearing process of thin-sheet metals—Development of initial tool position adjustment system

In the shearing process, clearance has a significant effect on machining accuracy. However, the relationship between uneven clearance caused by misalignment of tool position and machining accuracy remains unclear. This is attributed to the fact that, previously, the effect was small because the thickness of the workpiece was not so thin, and a method for precisely measuring and adjusting the tool position had not been established. Therefore, in the present study, a new method of adjusting the initial tool position is developed. In addition, punching experiments are conducted under the condition that the initial tool position is adjusted to an accuracy of 2 μm or better, and the effects of clearance on machining accuracy, shape of cross-section, and diameter of hole, are investigated in three types of materials. From these results, the importance of adjusting the initial tool position is clarified.     

消失模铸造工艺因素对金属液充型速度影响的研究述评

评述了消失模铸造金属液充型速度的研究现状，从传热、传质角度分析了各工艺因素对充型速度的影响。消失模铸造金属液的充型速度是由泡沫模样的热分解速率及分解产物的逸出速率之问的动平衡所控制的，某个给定铸造过程的实际充型速度是充型阶段各因素的综合结果。凡是影响传热、传质的工艺因素都对充型速度有影响。     

SUS430不锈钢的冷轧工艺及质量

针对国内市场对SUS430不锈钢需求不断扩大而其生产难度较大问题 ,宝新不锈钢公司摸索出一套生产技术。文中介绍了从退火→酸洗→轧制→冷轧卷退火、酸洗→平整中各工序出现的问题及解决措施。