Since the data is collected from disparate sources in many actual data mining environments, it is common to have data values in different abstraction levels. This paper shows that such multiple abstraction levels of data can cause undesirable effects in decision tree classification. After explaining ...
DATABASESYSTEM CONCEPTS SIXTH EDITION Abraham Silberschatz Yale University Henry F. KorthLehigh University S. SudarshanIndian Institute of Technology, Bombay Data Abstraction For the system to be usable, it must retrieve data efficiently. The need for efficiency has led designers to use complex data s...
The shift in emphasis is representative of the move toward more abstraction in computer science education. We now are interested in the study of the abstract properties of classes of data objects in addition to how the objects might be represented in a program. Johannes J. Martin puts it very...
Conceptual database design is the highest level of abstraction in the database design process. At this stage, designers focus on understanding the problem domain and defining the overall structure of the database without getting into technical implementation details. The primary goal is to crea...
The visualization of such structures faces many challenges that are not relevant in the visualization of one-dimensional data. The visualized data can be represented using several different types of visual metaphors. These metaphors can be divided into several different levels of abstraction depending ...
Purdue e-Pubs Development Of Operating Envelope Limits For Equipment Tested In A Wind Tunnel Development of Operating Envelope Limits for Equipment Tested ... A wind tunnel conditions the air flow for testing equipment, such as heat exchangers, over a wide range of conditions. In this paper, a...
We argue that it is imperative that modelers select the right, and potentially differing levels of abstraction for different components of their computational models, as too global or too specific components will hinder scientific progress. We describe ACT-R, from the perspective that is a useful ...
Two Levels of Abstraction 抽象的2个级别 Now that we have a powerful, database-agnostic approach to exception handling, let's look at implementing an abstraction framework that will make JDBC much easier to use. 现在我们有一个强大的,与数据库无关的途径去处理异常,让我们看实现一个是jdbc更容易用...
现成的调试工具能够帮助开发者,选定特定的线程作为调试目标,一次检查一个线程可能会很乏味,并且在将错误缩小到代码中的特定部分时最有效。可视化的检查并行操作的输出结果能够帮助开发者快速获得整体概述,有助于更快的确定出问题的地方。这个可以视为,对higher level of abstraction的调试,需要能够快速获取底层的信息。
Data Abstraction: Definition & Example from Chapter 4 / Lesson 17 59K Data abstraction makes complex systems more user-friendly by removing the specifics of the system mechanics. Discover how data abstraction involves creating a new user interface t...