中文文本自动校对技术现状及展望

本文概述了中文文本自动校对技术的产生背景,分析了预校对文本常见的错误类 型及文本自动校对(自动查错和确认纠错)的难点,探讨了当前商品化的文本校对软件的校对策略和发展趋势。     

Probabilistic Type-2 Operators and “Almost”-Classes

We define and examine several probabilistic operators ranging over sets (i.e., operators of type 2), among them the formerly studied ALMOST-operator. We compare their power and prove that they all coincide for a wide variety of classes. As a consequence, we characterize the ALMOST-operator which ranges over infinite objects (sets) by a bounded-error probabilistic operator which ranges over strings, i.e., finite objects. This leads to a number of consequences about complexity classes of current interest. As applications, we obtain (a) a criterion for measure 1 inclusions of complexity classes, (b) a criterion for inclusions of complexity classes relative to a random oracle, (c) a new upper time bound for ALMOST-PSPACE, and (d) a characterization of ALMOST-PSPACE in terms of checking stack automata. Finally, a connection between the power of ALMOST-PSPACE and that of probabilistic circuits is given. Received: 16 April 1996     

A Skeptic's Approach to Combining HOL and Maple

We contrast theorem provers and computer algebra systems, pointing out the advantages and disadvantages of each, and suggest a simple way to achieve a synthesis of some of the best features of both. Our method is based on the systematic separation of search for a solution and checking the solution, using a physical connection between systems. We describe the separation of proof search and checking in some detail, relating it to proof planning and to the complexity class NP, and discuss different ways of exploiting a physical link between systems. Finally, the method is illustrated by some concrete examples of computer algebra results proved formally in the HOL theorem prover with the aid of Maple.     

火电机组运行小指标考核方法探讨

科学合理地开展火电厂运行小指标考核，可以调动运行人员改进操作技能的积极性，有利于提高机组运行的经济性。对运行小指标考核的原则、成绩计算方法和数据库的建立进行了探讨，建议采用根据不同运行工况和试验值确定考核成绩的实时算法。采用实时算法不仅可以真实地反映运行人员的实际操作水平，还有助于及时发现运行中存在的问题。本方法在300MW等多台运行机组上应用，在指导火电厂生产和提高机组经济、安全运行方面取得良好效果。     

A predicate spatial logic for mobile processes

A modal logic for describing temporal as well as spatial properties of mobileprocesses, expressed in the asynchronous π-calculus, is presented. The logic has recur-sive constructs built upon predicate-variables. The semantics of the logic is establishedand shown to be monotonic, thus guarantees the existence of fixpoints. An algorithm isdeveloped to automatically check if a mobile process has properties described as formulasin the logic. The correctness of the algorithm is proved.     

Parallel and Systolic Solution of Normalized Explicit Approximate Inverse Preconditioning

A new class of normalized approximate inverse matrix techniques, based on the concept of sparse normalized approximate factorization procedures are introduced for solving sparse linear systems derived from the finite difference discretization of partial differential equations. Normalized explicit preconditioned conjugate gradient type methods in conjunction with normalized approximate inverse matrix techniques are presented for the efficient solution of sparse linear systems. Theoretical results on the rate of convergence of the normalized explicit preconditioned conjugate gradient scheme and estimates of the required computational work are presented. Application of the new proposed methods on two dimensional initial/boundary value problems is discussed and numerical results are given. The parallel and systolic implementation of the dominant computational part is also investigated.     

斜井提升钢丝绳日常检查新方法

介绍了一种日检钢丝绳的新方法,分析了该方法的优、缺点及应用注意事项。这种日检方法具有操作简单、检测费用低、缺陷检测全面、劳动强度降低、查绳速度快、不易漏检缺陷等特点,适用范围广。     

基于uMSD的Web服务组合验证方法研究

手工分析组合服务相当困难和耗时,为此提出了一种基于uMSD的Web服务组合的模型检验方法.如何简单和直观地表示Web服务组合的时态性质是该方法的关键问题.鉴于uMSD在简单性和表达力之间找到了一个平衡点,定义了uMSD的形式语法和语义.以Web服务组合OJA为实例,使用uMSD来图形化地表示组合服务的时态性质,展示了u...     

Principles and methodology of fuzzy sets

The principles of fuzzy sets and their role in processing uncertain information will be discussed. The question of knowledge representation that is of significant importance in problems of system modelling will be formulated and considered at the level of fuzzy sets. Modelling and simulation realized with the aid of fuzzy sets are studied in a unified methodological framework. First a notion of the cognitive perspective is applied to articulate the problem in terms of specialized linguistic labels. Fuzzy models are constructed to capture logical relationships between the elements (linguistic labels) of the cognitive perspective. Several different classes of the models distinguished with regard to their structural dependencies will be analysed in depth. Finally a linguistic-numerical transformation constituting a type of model-environment interface will be studied.     

安全支付协议的设计与验证研究

安全支付协议是实现电子商务在线支付的关键。目前缺乏同时支持电子商品和实物商品的在线支付协议,基于此,该文给出了一种同时支持这两类商品交易的安全支付协议,最后使用SMV工具对协议的原子性进行了分析并验证了其可行性。