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排序方式: 共有512条查询结果,搜索用时 15 毫秒
1.
零售业是生活中常见的行业,在零售业中引入了电子收款机系统(Point of Sells,POS)即进销存管理系统,是商店经营中的最热门的话题之一。这种进销存管理系统一般是现在比较常见的客户端/服务器模式也即C/S模式。文章介绍了采用INSPRISE公司的DELPHI7.0开发工具结合SQL SERVER2000数据库服务器。首先在短时间内建立系统应用原型,然后,对初始原型系统进行需求更迭,不断修正和改进,直到形成用户满意的可行系统。 相似文献
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Computer Numerical Control Machine Tool (CNCMT) Digital Twin (DT) model is a carrier for complex, time-varying, coupled data of CNCMT, which can theoretically provide a time-varying high-fidelity model. However, there are still many difficulties in its implementation process. And the key issue is how to realize the updated DT model with performance attenuation and validate it. In order to solve this problem, a model consistency retention method for CNCMT DT model is studied and proposed in this paper. Firstly, the framework of consistency retention method for DT model is designed including both digital space and physical space. The principles of data management and performance attenuation update in digital space are elaborated. Then, the implementation method for consistency retention of CNCMT DT model is studied in terms of performance attenuation update workflow for wear and other damage separately. Finally, a case study for the establishment and application of high-fidelity test bench DT model that focusing on rolling guide-rail is carried out to show the implementation flow of the proposed method and verify its operability and effectiveness. 相似文献
4.
A model representing the wet-end section of a paper mill has been developed to characterize its dynamic behavior during the
grade change. The model is based on the mass balance relationships written for the simplified wetend white water network.
From the linearization of the dynamic model, higher-order Laplace transfer functions were obtained followed by the reduction
procedure to give simple lower-order models in the form of 1st-order or 2nd-order plus dead times. The dynamic response of the wet-end is influenced both by the white water volume and by the level
of wire retention. Effects of key manipulated variables such as the thick stock flow rate, the ash flow rate and the retention
aid flow rate on the major controlled variables were analyzed by numerical simulations. The simple dynamic model developed
in the present study can be effectively used in the operation and control.
This paper is dedicated to Professor Se Ki Moon on the occasion of his retirement from Hanyang University. 相似文献
5.
M. S. Miskandar Y. B. Che Man M. S. A. Yusoff R. Abdul Rahman 《Journal of the American Oil Chemists' Society》2002,79(9):931-936
The effects of scraped-surface tube cooler temperatures on the isothermal solid fat content (SFC) of palm oil margarine during
processing and on margarine consistency (yield value, g/cm2), SFC, and polymorphic changes in storage were studied. SFC was measured in the mixing tank after leaving the tube cooler
and the pin worker. The SFC at the tube cooler exit was proportional to the amount of cooling; a higher SFC was produced by
more extreme cooling treatment. The SFC of all margarines were reduced in the pin worker, and the reduction was related to
the initial SFC profile of palm oil. Margarine samples were stored at 28°C for 28 d and tested daily. Margarine processed
at 25°C in the tube cooler had the highest consistency and the least change in SFC, but by the second week crystals had transformed
into the β form. Uniform product consistency and SFC were observed in margarines processed at 20 and 15°C. These margarines
retained the β′ crystal form for 3 and 4 wk, respectively. The best palm oil margarine was obtained with a tube cooler temperature
of 15°C and a residence time of 1.8 min. 相似文献
6.
Architectural design decisions (ADDs) have been used in recent years for capturing design rationale and documenting architectural knowledge (AK). However, various architectural design views still provide the most common means for describing and communicating architectural design. The evolution of software systems requires that both ADDs and architectural design views are documented and maintained, which is a tedious and time-consuming task in the long run. Also, in lack of a systematic and automated support for bridging between ADDs and architectural design views, decisions and designs tend to become inconsistent over time. In our proposal, we introduce a reusable AK transformation language for supporting the automated transformation of reusable AK knowledge to component-and-connector models, the architectural design view used most commonly today. In addition, reusable consistency checking rules verify the consistency between decisions and designs. We evaluate our approach in an industrial case study and show that it offers high reusability, provides automation, and can, in principle, deal with large numbers of recurring decisions. 相似文献
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8.
数据压缩是有效处理大数据的关键技术,在飞腾处理器平台上基于zlib库的数据压缩通常采用软件的方式实现,在数据处理量大而且实时性要求较高的情况下,已经难以满足需求。针对这个问题,通过研究zlib编程函数库,结合飞腾处理器的特性,完成了飞腾平台中硬件数据压缩的驱动设计与实现,其中提出了双向DMA传输技术和基于一致性内存的命令环机制,从而进一步提高了基于硬件的数据压缩的效率。通过实验证实了飞腾平台中采用硬件数据压缩改进的有效性。 相似文献
9.
针对代码与模型之间的不一致性问题,提出了一种基于UML模型和Java代码之间的一致性检测方法.首先,对UML类图和时序图进行形式化描述,并提出时序调用图(SD-CG)这一概念,在此基础上完成类的关联关系到关联属性的转换以及UML时序图到时序调用图SD-CG的转换;其次,通过方法调用图CG来表达类方法之间的调用关系,从而反映代码动态行为,由此通过对Java源代码的词法分析与语法分析,可获得类的信息及方法调用图CG;然后设计了UML模型与Java源代码间一致性检测算法,包括对类间静态信息以及时序调用图SD-CG与方法调用图CG间的一致性检测;最后,通过开发UML模型与Java源代码一致性检测工具,验证了所提出的方法是可行有效的. 相似文献
10.
With more and more real deployments of wireless sensor network applications, we envision that their success is nonetheless determined by whether the sensor networks can provide a high quality stream of data over a long period. In this paper, we propose a consistency-driven data quality management framework called Orchis that integrates the quality of data into an energy efficient sensor system design. Orchis consists of four components, data consistency models, adaptive data sampling and process protocols, consistency-driven cross-layer protocols and flexible APIs to manage the data quality, to support the goals of high data quality and energy efficiency. We first formally define a consistency model, which not only includes temporal consistency and numerical consistency, but also considers the application-specific requirements of data and data dynamics in the sensing field. Next, we propose an adaptive lazy energy efficient data collection protocol, which adapts the data sampling rate to the data dynamics in the sensing field and keeps lazy when the data consistency is maintained. Finally, we conduct a comprehensive evaluation to the proposed protocol based on both a TOSSIM-based simulation and a real prototype implementation using MICA2 motes. The results from both simulation and prototype show that our protocol reduces the number of delivered messages, improves the quality of collected data, and in turn extends the lifetime of the whole network. Our analysis also implies that a tradeoff should be carefully set between data consistency requirements and energy saving based on the specific requirements of different applications. 相似文献