自顶向下

So far, we have considered two top-down and two bottom-up approaches.

到目前为止，我们已经考虑了两种自顶向下和两种自底向上的方法。

All the conspicuity maps will be integrated into a single conspicuity map which will be used to extract interesting map by nonlinear relaxation algorithm. The top-down attention mechanism uses the knowledge of visual task and object.

知识驱动的自顶向下注意机制基于自底向上兴趣图和待注意物体的知识，通过模式匹配生成描述待注意物体可能存在的位置的自顶向下兴趣图。

This paper presents the general methods and process of panel die design in PRO/E environment. The design can be top- down and bottomup. The emphasis is on the design and analysis of die surfaces under the PRO/DIEFACE including extensions, extension ratio, spring back ,etc.

本文探讨在PRO／E环境下采用自顶向下和自底向上的方法进行覆盖件模具设计的技术、方法和过程，着重叙述利用PRO／DIEFACE进行模具接触面设计、分析和空间曲面处理的步骤，包括模具型面、工艺余料、法兰、拉深筋、弹复角的生成和成形度分析等。

It is a bottom-up, Agent-OrientedDesigning paradigm, compared with the traditional method that emphasizes top-down function analysis, modular decomposition and component construction.

这是一种自底向上的面向Agent的系统设计方法，它和传统的自顶向下功能分解并实现的模块设计法形成了鲜明的对比。

In application, this system has been used to process a large numbers of page images, and has shown efficient and satisfiable performance.

本系统采用了自顶向下方法与自底向上方法相结合、自动处理与人工修正相结合的设计思想。

Since any frequent itemset is a subset of a maximal frequent itemset (an itemset is maximal frequent if it has no superset that is frequent), this paper proposes the DMFI (Discovery of Maximal Frequent Itemsets) algorithm for mining all the maximal frequent itemsets from data sets. This algorithm searches the maximal frequent itemsets in data sets from both bottom-up and top-down directions in the meantime. This paper proposes an algorithm that evaluates the boundaries on the support and confidence of uncalculated itemsets by exploiting the information provided by the calculated itemsets.

本文在经典关联规则的基础上，提出了一系列扩展的关联规则开采算法：发现关联规则的难度体现在发现频繁项目集上，事实上最大频繁项目集（其所有的超集都为非频繁项目集的频繁项目集）的集合已经包含了所有的频繁项目集，本文提出一种发现最大频繁项目集的算法DMFI(Discovery Maximal Frequent Itemsets)，该算法采用自底向上和自顶向下相结合的搜索策略对数据空间进行有效的搜索。

Based on this mapping, the processing of visual information is separated into foveal and peripheral channel, or what and where channel, which mainly relates to the tasks of interesting object recognition and fixation point movement respectively.

不同于以往的大多数工作，本文强调了将注意目标的选择建立在基于低级刺激的自底向上注意过程和基于知识的自顶向下注意过程相结合的基础上。

Autonomous system always need to work in complex multivariant environment, e.

控制一个复杂系统有两种方式：自顶向下的还原主义方式和自底向上的行为控制方式。

On the basis of parameterization technology based on feature and assembly modeling technology based on Top Basic Skelton, a Top-down modeling method which combines skeleton model with dominant parts is put forward, and accomplished a product design with it.

本文研究了支持自顶向下设计的产品功能建模与装配模型，在基于特征的参数化技术以及基于顶层基本骨架的建模技术基础上，提出了骨架模型与主导零件相结合的自顶向下建模方法，完成了具体的产品设计。

Based on the characteristics of parameterized design and key technologies of knowledge based engineering, and specially according to the characteristics of the construction, figure, assembly-parameter of bicycle frame design, the article has achieved repeated using of experiential parameter and knowledge by adopting methods such as automatic reading experiential datasheet, computing parameter by making use of program, manual data-input or modifying and so on. Based on analyzing the characteristics of Rear End design and the associated characteristics with Chain Stay and Seat Stay, different design methods are analyzed in detail, and rapidly assembling of Rear End, Chain Stay and Seat Stay is achieved by using the method of combining top-down-assembly with down-top-assembly method. Based on analyzing special technologies and UDF characteristics, the repeated using of different sectional shapes by using UDF technology on the tube section design is also achieved, and this will greatly shorten the time spent on fixing the dimensions and orientations on sketches.

在探讨了参数化设计技术特点和知识工程关键技术的基础上，针对自行车车架设计中的结构、形状、装配参数特点，分别采用了读入经验数据表、参数程序求解、手工录入或修改方法实现车架设计经验参数和知识的重复利用；在分析自行车后叉片设计特点及与平、立叉的关联特性的基础上，对不同的设计方案进行了详细分析，并采用自顶向下和自底向上相结合的方法，实现了后叉片的快速装配定位与平、立叉设计相关联；在分析了特征技术和UDF特点的基础上，将UDF用于管件截面的设计上，使各种截面形状能不断重复利用，大大节省了约束草图尺寸和位置的时间。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。