53 resultados para model driven system, semantic representation, semantic modeling, enterprise system development


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现代信息技术的发展促使世界各国进行教育信息化的改革。用IT技术辅助教学,特别是网络教学成为信息化教育的主要应用之一,它在提高教学效率的同时,缓解了知识爆炸对教育所带来的冲击,可是目前的IT技术只是用于加固传统落后的教学模式,不能从根本上改变现代教育不适应知识经济发展的社会需求,需要思考能建立适应信息社会人才需要的教育模式。 多尔的后现代课程观批判了现代主义课程观的弊端,例如封闭性、简单性和累积性,重视课程系统的开发性,课程内容的丰富性,注重学习环境的关联性。而网络教学突破教学时空的局限,提供丰富的教育资源,优化自主学习,强化教学互动。因此将后现代课程观理念融入网络教学的教学模式,用网络教学来支持后现代课程教学理念的实现,能为解决现代教学存在的问题开辟新的道路。 本文抓住后现代课程观的核心概念之一交互,通过分析目前网络教学中交互支持工具的现状,提出了围绕主题的同步交互学习支持的方法和工具实现,将后现代课程观中的交互理念与围绕主题学习的思想相结合,利用即时通信和个性化知识的再组织辅助学习中的交互过程,使得整个交互过程与学习内容紧密结合,提高了学习的效率和质量,体现了后现代课程观对课程教学的指导意义。

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本文以菩提树为培养对象,采用改进的液驱式间歇浸没培养技术进行组织培养实验。为了更准确,精密地控制培养条件我们研制了间歇浸没式植物培养箱;为了提高培养效率,降低成本,我们对现有培养系统和方法进行了改进。鉴于液驱式间歇浸没培养半开放等培养特点,容易造成雪崩式污染。通过调查污染来源,研究各种物理化学生物杀菌抑菌方法的特点,以及对各个培养环节的消毒能力,建立了一套适合菩提树间歇浸没无糖培养的污染控制操作规程,为进一步大规模的商业化生产打下坚实的基础。 研究结果表明, 1、利用液驱式间歇浸没系统装置(简写为TD-TIB)进行组织培养,效率更高,成本更低。 液驱式间歇浸没培养与RITA和TIB相比,简单易操作,能耗低,效率高,成本低。与间歇浸没式植物培养箱配合使用,能够精密控制环境培养参数,包括温湿度,二氧化碳氧气的全程自动化检测控制 ,能够实现远程实时控制。利用液驱式培养方法生根后的培养苗自养光合能力强,驯化时间短,成活率高,芽多,健壮。 2、操作规程能够控制半开放间歇浸没培养中的污染问题。 从对紫外,臭氧,酒精,抗生素,杀菌剂以及过滤等污染控制方法的研究我们得出,任何一种消毒杀菌方法都不能控制系统的污染,只有结合培养系统环节和消毒方法的特点,把各种方法有机组合起来才能控制半开放条件下的污染。预处理是整个控制过程的关键。按照该操作规程,在2min/2h的间歇频率下的无糖间歇培养中,30天内成功实现了菩提树的生根驯化实验,培养液无污染。 间歇浸没培养技术与污染控制技术相结合实现了小范围的规模化培养,为大规模自动化组织培养技术奠定了坚实的基础。

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Recent vacuum system development with an XHV condition for the particle accelerators is briefly described. The progress of selecting and treatment of the materials used in XHV systems is introduced, and the choice of the main pump for an XHV system and some new pumping method are presented. Some leak detection experiences both for the superconducting and warm vacuum systems are recommended and the status of XHV measurement and the gauge calibration are introduced.

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在Visual C++环境下编制了一个用于HIRFL设备自动巡检和报警的应用。通过网络自动读取和显示当前所有受计算控制的设备(电源设备)状态,遇见设备故障时自动发出警报。具有响应用户的中断请求,选择或屏蔽设备,更改设备误差,自动存储故障记录等功能。在Visual C++环境下编制了另一个用于HIRFL束流状态显示的应用软件。通过网络自动读取和分析受计算机控制的束诊设备的参数,并实时显示相应的束流位置或状态。具有直观显示束流当前位置,动态描述束流走向等功能。这两个程序在功能上能够满足HIRFL设备自动巡检和报警以及束流状态显示系统研制的任务书要求。

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通过对纸房沟流域土地利用结构和收入结构的简要分析 ,提出了生态系统与经济系统演变的一般规律 ,受生态系统与经济系统演变规律的启示 ,提出了纸房沟流域生态经济系统进一步建设的策略。

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首先应用Visual Basic 6.0计算机语言,根据我们所熟知的海洋重力数据的处理步骤和海洋重力测量规范内容,开发出一套海洋重力资料整理软件,以便能使资料整理工作成为一体化,提高工作效率,保证数据处理的准确性。应用该软件对南海某工区的实际重力资料进行了处理,得到了满意的处理结果,证明该软件使用方便,计算准确可靠,能够快速准确的处理采集到的重力数据。对数据处理结果进行了分析和应用。 通过分析Eötvös校正值与重力仪读数之间的变化关系,可以对重力仪的动态性能进行分析和评价。得到2级海况条件下重力仪的实际阻尼延迟时间约为60s,比厂方推荐的理论值(110s)更接近实际,有助于减小数据处理过程中的定位误差,提高测量精确度。通过对重力仪的灵敏性进行分析,验证重力仪在测量过程中的准确性和可靠性,为获得精确的数据提供可靠的保障。 对该套规则重力测网数据,分别采用60s阻尼延迟时间和110s阻尼延迟时间进行阻尼延迟校正,然后进行交点差计算和平差处理,得到的结果显示:采用60s阻尼延迟时间对数据进行阻尼延迟校正后得到的测量精度为1.40mGal,经过平差后的测量精度为0.77mGal;而采用110s阻尼延迟时间对数据进行阻尼延迟校正后得到的测量精度为1.62mGal,经过平差后的测量精度为0.96mGal。此结果验证了利用船只机动转向法确定海洋重力仪的实际阻尼延迟时间的必要性和应用价值。 最后,对宋文尧等人的平差方法和刘保华等人的最小二乘平差方法进行了分析比较,从推导原理和计算结果两方面证明了两种方法在规则海洋重力测网平差作用上是等效的。对于不规则重力测网平差,最小二乘平差方法具有强大的优势,且计算机程序运算实现方便。

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本文介绍了《天马》专家系统开发环境中窗口生成系统的设计原理及其实现,包括一组丰富实用的窗口操作函数及一个交互式窗口设计环境,方便了用户设计自己开发系统的人机界面。

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This study is aimed to reveal macroscopic and microscopic anisotropism by using new theories, new methods and new technology. In order to reveal the forming mechanism and distribution pattern of remaining oil, flow units 4-dimension model and realistic model was established according the data over 20 years development of the Pucheng Oil field. Based on theories of multi-discipline subject, methods and technologies, by using correspondent 4-D data body and computer, combining quantity and quality study, static and development data, macroscopic and microscopic data, the two different geneses' reservoir, eg., braided delta and lake delta, are studied. The two different geneses' reservoir flow units models were established. Main achievement of this thesis are summarized as following: The standard of parameter optimization, identification and appreciation of two different geneses' reservoir were established. Based on the standard, the reservoir were classed into four flow units class as G,E,F and P. The flow unit static models of two different geneses' reservoir were established, and the relation of geometric shape, space distribution and macroscopic remaining oil was revealed. the flow units microscopic model were established, which tells that the changes of all the microscopic factor in the development. (4) Accordig BP arithmetic method, an adapt arithmetic method were designed, and the reservoir flow units were simulated based on the new method. (5) Reservoir realistic model of flow unit were established. Based on the model the microscopic development is simulated, which reveals the oil and water seepage in the reservoir and the mechanism of the microscopic oil formation. (6) The spatial residual oil distribution patterns were summarized. The remaided oil is mainly in the places as not being affected by the injected water, high part of the structures and the place near the sealed faults. There are 3 kinds and 9 distribution modes of microscopic remaining oil. The forming mechanism and distribution rule were pointed out. The study has developed a set of theories, technology and methods for flow units study, including flow units description, characterization and prediction. The study is also an improvement of the development geology theory in continental fault depression lake basin.