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关键词： 文字符号   工程图纸   字符识别   字符分离  

摘要： 根据工程图纸中字符的特点，定义了字符轮廓的长宽比、形状复杂度、内孔数和区域密集度，阐述了基于这些轮廓特征的字符分离方法，且将神经网络应用于工程图纸的字符识别，取得了满意的识别效果。

关键词： Computer simulation  

摘要： Better diagnostic assistance is achieved when viewing a combination of static and dynamic properties of the simulation code. Now, the analyst is able to find logical/execution errors, e.g., errors related to resource deadlocks, before running simulation experiments. Since the graphical model is generated from the simulation code, and the process combines views, the analyst also has a better framework for verifying the coded simulation model. Also, the reverse engineering step provides a structural model useful in converting between different simulation languages or systems. Improvements to the techniques for conversion between languages will facilitate reuse of existing programmed models.

关键词： 涡流损耗   等梯度下降   部分   磁滞损耗   瑞利公式   磁滞回线面积   磁损耗   分离技术   多频功率电源   异常损耗  

关键词： 工程图理解   字符分离   轮廓跟踪   字符串生成   字符识别  

摘要： 提出了同步边缘特性检测的轮廓跟踪算法，并基于规则从扫描图像全图轮廓中分离字符轮廓；在此基础上，针对机械工程图，采用全方位的邻域搜索技术生成不同方向的字符串，通过分类树进行识别，并根据专业领域知识进行校正．实验测试表明。

关键词： Algorithms   Tradeoffs   Polynomials   Dynamic programming   Total costs  

摘要： This note addresses the discrete version of the well-known time-cost tradeoff problem for project networks, which has been studied previously in the standard project management literature as well as in the related literature on Decision-CPM, All the algorithms proposed thus far for the solution of the general problem exhibit exponential worst-case complexity, with the notable exception of the pseudo-polynomial dynamic program due to Hindelang and Muth. We first demonstrate that this algorithm is flawed, and that when we correct it. it no longer remains pseudo-polynomial. Continuing on in the main result of the note, we show that this is not at all surprising, since the problem is strongly NP-hard. Finally, we discuss the complexities of various network structures and validate an old conjecture that certain structures are necessarily more difficult to solve.

关键词： 分离工程   CAI软件   教学软件   利用计算机   计算机辅助   数据处理   精馏塔   化静为动   设计思想   逻辑判断  

摘要： 一、设计思想与组成 本教学软件充分利用和发挥计算机优势,以及逻辑判断功能,集动画、闪烁、计时、声音、人机对话等于一体。使分离工程课程中不易理解的一些抽象概念形象化、微观运动宏观化、化静为动、化小为大,以帮助学生深刻理解和掌握该课程中的知识。

关键词： 水力机械   流动分离   水力损失   分离尺度  

摘要： 分离的产生将严重影响水力机械的流动特性，流动分离与水力损失密切相关。为了在设计中确定流动分离损失，该文通过利用死水区假设近似计算分离区的大小，提出了一种近似计算分离损失的方法。同时，给出了一种利用进出口参数来确定转轮内部流动分离的分离尺度和起始位置的工程模型。研究结果表明，流动发生分离后，在流向下游的过程中分离区不断扩大。流动分离的起始位置对转轮出口的分离尺度及水力损失有很大的影响。

关键词： 工程图自动识别   矢量化   图素   图素分离  

摘要： 迄今为止,工程图自动识别的算法很多,但由于识别技术仍存在着质量上的问题,识别率不能满足工程实际的需要,众多识别软件离实用化还有一段距离.如何另辟蹊径,探索新的识别方法,改进识别效果是工程图自动识别领域新的研究方向.

关键词： SOFTWARE engineering   MANUFACTURING cells   PETRI nets  

摘要： The objective of this work has been to develop a cell. control system which could be used in manufacturing cells, truly adapted to real industrial environment needs and suited for different physical cell configurations. The main goals achieved within the project have been the development of a user-oriented methodology and software tools, a reference architecture for cell control applications and a common language for the analysis, design, simulation and implementation of the cell control logic. The proposed methodology is characterized by modular, integrable, and distributed developments and is described in an Implementation Guide, which gives a complete project view and covers different issues related to cell control development projects, and also compiles and organizes the previous knowledge and experience existing in cell control. In order to validate, evaluate and prove the methodology, an industrial pilot application was developed using a Petri-net-based graphical tool. With the proposed approach most of the problems appearing in the software development for manufacturing control systems have been reduced, giving a complete project support, and covering all the development stages. The use of Petri nets also offers the possibility Co deal with synchronous and concurrent events as it is required for manufacturing control systems.

关键词： 海洋生物资源   分离技术   生物工程   开发  

摘要： 本文综述了在海洋资源开发上应用的现代生物工程分离技术。介绍了最新的分离提取技术如制备型和生产型色谱技术、超临界萃取技术、膜分离技术、毛细管电泳技术、酶工程技术等。从海洋生物资源中提取有用的生物活性物质，需要符合特定要求的现代生物工程技术。其中柱层析技术和超临界萃取技术是海洋生物活性物质分离提取技术中的主要部分。