数据描述语言

基本解释 (translations)

DDL

词组短语

data description language

与数据描述语言相关的网络例句 [注：此内容来源于网络，仅供参考]

According to multimedia data model based on temporal logic and XYZ system, the authors designed and implemented a new multimedia authoring language MAL. This language supports the specification of abstraction, concurrency and the procedure of stepwise refinement design, it can be used to specify modeling information units, design and script a multimedia title in a unified framework.

根据基于时序逻辑和XYZ系统思想的多媒体数据描述模型，设计并实现了一种新的多媒体编著语言MAL，该语言具有抽象描述、同步描述、逐步求精设计的描述等能力，将多媒体节目中媒体对象的建模和多媒体节目的设计过程在一个统一的框架内进行描述。

The thesis studies the difference between GWSs composition and traditional workflow applications, proposes the implement mechanism and technical architecture of GWSs composition and defines the reference model of GWSs composition platform, which provide holistic framework and top-level guidance for studying dynamic GWSs composition technology, designing GWSs composition platform, and implementing representative composite service applications.2、Theories and methods of composite process modeling and process analysis. This thesis proposes a meta-model of Geo-spatial Web services composition process defining from two aspects, i.e. process and resource. According to the process definition meta-model, we propose a new Geo-spatial Web services composition Process/Resource model based on extended WF-net, which effectively resolves the problems on uncertain activity option and dynamic variation of service in composite process model. A notion with regard to soundness of process model is proposed from three aspects, i.e. the structural correctness of process model, validity of data link and validity of resource. The notion of soundness definitely gives a dividing line on correctness of composite GWS process. This thesis analyzes sufficient and essential terms of soundness, and studies compositional property of WSCP/R-net models which provides an effective method to construct a soundness WSCP/R-net model. According to WSCP/R-net, the thesis proposes composition algebra and studies the properties of it. Based on the composition algebra, 6 kinds of composite process reduction rules are induced to optimize the process.3、Geo-spatial Web service QoS model and its application architecture. This thesis proposes an extendable GWS QoS model from three aspects, i.e. Geo-spatial Web Service itself, networking conditions and service consumer which can be used to distinguish GWSs with overlapping or identical functionality. We work over the QoS evaluation methods of composite GWS process which can be used to guide the execution, monitor and service selection of composition process. Aming at some disadvantages in traditional Web service discovery model for its lacking of QoS supporting, this thesis proposes a new service discovery model SDMQ supporting QoS constraints.4、Technologies of composite service executing. SSPL, a new composite service process language, is defined to overcome the disadvantages of existing composite services process languages which can not adapt to the dynamic variation of Geo-spatial Web Services. An algorithm is described to translate WSCP/R-net model into SSPL. The thesis studies the model of dynamic services selection with QoS global optimization, presenting an algorithm GODSS to resolve dynamic services selection with QoS global optimization in GWSs Composition.5、Design and implement experimental system and representative applications. According to the research findings presented above, we design and implement an experimental system and construct two representative applications to show that our achievements are effective and practical.

针对当前空间信息服务聚合研究中存在的若干不足，本文重点在基于工作流的空间信息服务聚合框架、空间信息服务聚合流程建模和分析技术、空间信息服务QoS模型及应用体系以及空间信息服务聚合流程执行等几个方面进行深入研究，主要工作和创新点包括：1、基于工作流的空间信息服务动态聚合框架：研究了空间信息服务动态聚合和传统工作流应用的不同，在此基础上提出了基于工作流技术的空间信息服务动态聚合实现机制、技术体系和参考模型，为研究空间信息服务聚合的关键技术、开发服务聚合支撑平台以及在此基础上构造特定的空间信息服务聚合应用提供了总体框架和顶层指导。2、空间信息服务聚合流程建模和分析技术：首先基于动态服务聚合流程建模的需求和空间信息服务动态变化的应用实际，从服务聚合的过程维和资源维出发定义了服务聚合流程定义元模型；与之相对应，对基本的WF-net进行扩展，提出服务聚合流程/资源网作为空间信息服务聚合流程的形式化描述模型，有效解决了现有的基于基本Petri网和工作流网的服务聚合建模方法所不能解决的不确定路径选择和服务的动态变化性问题；从流程结构正确性、数据依赖有效性和资源实现有效性三个方面提出了WSCP/R-net健壮性的概念，明确界定了聚合流程正确性的标准，并对WSCP/R-net模型的健壮性分析方法和WSCP/R-net模型的组合特性进行了研究；提出了空间信息服务聚合代数算子并对其性质进行了研究，在此基础上提出了6种聚合流程约简规则，从而可达到优化聚合流程、提高聚合流程执行效率的目的。3、空间信息服务QoS模型和应用体系：从服务本身、网络环境和服务消费者三个层次出发，提出了一个可扩展的空间信息服务QoS模型GSQM，实现了对空间信息服务的度量和评价，并对GSQM不同质量要素信息的客观、公正采集方法进行了研究；研究了空间信息服务聚合流程QoS评价方法，有效支持了空间信息服务聚合流程的执行、监控以及服务选择等操作；针对目前的服务发现模型仅支持服务功能性描述、不能有效满足空间信息服务应用需求的现状，提出了一种新的支持QoS约束的服务发现模型SDMQ，并对模型的实现框架进行了研究。4、空间信息服务聚合流程执行技术：针对现有的服务聚合流程描述语言不能有效满足空间信息服务动态聚合流程描述的特点，基于BPEL4WS提出了一种新的空间信息服务聚合流程描述语言SSPL；研究了满足健壮性要求的WSCP/R-net模型向SSPL的转换算法，在此基础上可以满足用户无显式编码来实现空间信息服务聚合应用的目的；研究了服务动态选择QoS全局优化模型，并在此基础上提出了一种解决服务动态选择QoS全局优化问题的实现算法GODSS.5、基于论文研究成果，设计实现了"空间信息服务聚合实验系统"，并构建了"矿产资源评价"和"城市消防应急响应"两个典型应用案例，对论文所述模型、方法的可行性和有效性进行了验证。

XML has been widely used as a data description language.

XML作为一种数据描述语言在信息系统中得到广泛应用。

Virtual Data Description – Language?

虚拟数据描述语言？

FDDL? File Data Description Language?

文件数据描述语言

FDDL? Field Data Description Language?

域数据描述语言

Instantiating the architecture of open CNC system to data communication components Currently, there are four types of describing and expressing software architecture:(1) figure expression drawing with rectangles and directed line segments;(2) path language in module that links traditional programming language module;(3) special software architecture description language combining object-oriented technology with the development experience of traditional program design language;(4) system description language based on components.

instantiating结构的开放式数控系统的数据通信元件目前，共有四种不同类型的描述和表示软件体系：(1)数字表达绘画rectangles定向线段；(2)路径语言模块连接传统的编程语言模块；特殊软件构架描述语言结合面向对象技术与发展经验的传统程序设计语言；(4)系统描述语言的组件。

For the image with random field feature, the description language is probability distribution model, and the description length equals the negative base-two logarithm of the probability of the image data; For the region homogeneity properties of active contour, the description language is chosen as a sign gradient map, and the description length is the summation of sign gradient inside the active contour; For the active contour regularity, the description language is smoothness, and the corresponding description length is the length of active contour curve.

随机场图像的描述语言采用概率分布模型，描述长度是围道内外区域中图像数据概率的以2为底对数的负数；活动围道区域一致性的描述语言为有符号的梯度图，描述长度是围道内区域有符号梯度的总和；围道形态的描述语言采用平滑性，描述长度正比于围道的长度。

Now HLS has absorbed much research attention in IC-CAD field. In HLS, algorithms represented by algorithm description language are transformed into hardware structure description consisted of resisters and transfers. In the transforming process, synthesis of datapath is a core. The other works is based on it. And in the synthesis of datapath, operation scheduling, functional unit allocation and binding all are NP-Completeness problems. The structure of their solution space is not known well. If we must find a global optimum solution, we can only use exhaustion. This way needs too much computation for VLSI synthesis, and is impractical in Industry. So usually heuristic algorithms are used to search suboptimum solution.

因此HLS成为国际IC-CAD学界的一个热门，它把算法描述语言表达的算法转换为用寄存器、传输器描述的硬件结构，其中以数据通路的综合为主体，其余工作皆以此为基础；而在数据通路综合中，操作调度、功能单元分配、连线等均属NP问题，目前该问题的解空间尚未充分了解，如要求得最优解，只有采取穷举搜索法，对于大规模集成电路而言运算量太大，工业中无法承受，故通常都采用启发算法求次优解。

Through the decomposition of network operation behavior and the data mining of various data,forms the most basic smallest unit of network operation behavior（DNA of network action description）,uses the Teiresias evolution algorithm to carry on the overall situation ergodicity combination to produce the new description language.

通过对网络操作行为的分解和对各种数据的挖掘，形成最基本最小的网络行为语言描述单元，再使用Teiresias进化算法对其进行全局遍历性的组合，计算产生新的描述语言，进行可行性判断后，对可行的结果进行规则匹配并进行风险评估，产生新的防御规则，从而达到入侵防御系统规则库完备的目的。

与数据描述语言相关的网络解释 [注：此内容来源于网络，仅供参考]

file data buffer：档案数据缓冲器

档案数据块 file data block | 档案数据缓冲器 file data buffer | 档案数据描述语言 file data description language,FDDL

data delimiter：数据分隔符

data compression%[]%数据压缩% | data delimiter%[]%数据分隔符% | data description language%[]%数据描述语言%

data description language：数据描述语言

data density 数据密度 | data description language 数据描述语言 | data design 数据结构设计

Data Description Language DDL：数据描述语言

数据流图 Data Flow Chart | 数据描述语言 Data Description Language DDL | 数据生成器 Data Generator

Intermediate data Description Language：中间数据描述语言

IDL Instruction Definition Language 指令定义语言 | Intermediate data Description Language 中间数据描述语言 | IE Internet Explorer Internet浏览器

schema data description language：纲目数据描述语言

纲目数据描述 schema data description | 纲目数据描述语言 schema data description language | 纲目资料项 schema data item

schema data description language：模式数据描述语言

schema 模式 | schema data description language 模式数据描述语言 | schema name 模式名

Field Data Description Language：字段数据描述语言

Fiber Distribution Data Interface 光纤分布数据接口 | Field Data Description Language 字段数据描述语言 | File Data Description Language 文件数据描述语言

File Data Description Language：文件数据描述语言

Field Data Description Language 字段数据描述语言 | File Data Description Language 文件数据描述语言 | Frequency Division Data Link 频分数据链路

ddl：数据描述语言

B) 数据描述语言(DDL)C) 数据操纵语言(DML)[解题要点]DBMS提供数据操纵语言(DML) 实现对数据库中数据的操作,数据操纵语言(DML) 是用户(包括应用程序) 与数据库系统的接口.