Temporal Information Processing Technology and Its by Yong Tang, Zewu Peng, Dongning Liu, Wenshen Zhang (auth.),

Posted On March 23, 2017 at 7:58 am by / Comments Off on Temporal Information Processing Technology and Its by Yong Tang, Zewu Peng, Dongning Liu, Wenshen Zhang (auth.),

By Yong Tang, Zewu Peng, Dongning Liu, Wenshen Zhang (auth.), Prof. Yong Tang, Xiaoping Ye, Na Tang (eds.)

"Temporal info Processing expertise and Its functions" systematically experiences temporal details processing expertise and its purposes. The booklet covers following matters: 1) time version, calculus and good judgment; 2) temporal facts types, semantics of temporal variable ‘now’ temporal database ideas; three) temporal question language, a customary temporal database administration procedure: TempDB; four) temporal extension on XML, workflow and data base; and, five) implementation styles of temporal functions, a standard instance of temporal program. The ebook is meant for researchers, practitioners and graduate scholars of databases, data/knowledge administration and temporal details processing. Dr. Yong Tang is a professor on the desktop institution, South China basic college, China.

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Chronon determines the precision of computer system, for example, two things that happen at different times but at the same chronon cannot be identified by a computer system. Overall, chronon is a fixed measurement but time granularity is a database defined time unit that can be changed in order to meet practical requirements. 2 State of Existence of Time Granularity There are two types of time granularities: single granularity and dynamic granularity. z Single granularity: Single granularity means that only one time granularity can be supported in some database systems, but granularities of different database systems may be different.

Being an important method of knowledge representation, axiomatic logic system can help us to understand the properties of time structure easily. We will introduce it at the end of this chapter. Keywords time model, temporal logic, Allen’s method, temporal calculations, time span, time granularity Temporal knowledge representation is the basic and important part of temporal database. The first job of temporal knowledge representation is to find the method to define and dispose time model. There are many basic time models, such as continuous model, stepwise model, discrete model.

If time were recorded in its original manner, the capacity for the records would have to be very large. Moreover, most of the time, people do not need to acquire the time status of the entire real world. Hence, the solution to the problem, we can think of, is to build a proper time model, which can not only be applied to data model, but also meet the requirements for various application situations. Based on the choice of time axis structure, we classify time models as follows. 1 Continuous Model In continuous model, time is viewed as real numbers, each of which corresponds to a time point (Alvarez and Mossay 2006).

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