Support Aggregate Analytic Window Function over Large Data with Spilled State
X Shi, C Wang - Journal of Physics: Conference Series, 2020 - iopscience.iop.org
Analytic function, also called window function, is to query the aggregation of data over a
sliding window. For example, a simple query over the online stock platform is to return the …
sliding window. For example, a simple query over the online stock platform is to return the …
The Irregularity Propagation Characteristics of Radio Signals For Wireless Sensor Network In Farmland
HJ Zhu, HR Wu, LH Zhang, YS Miao - ITM Web of Conferences, 2016 - itm-conferences.org
This work aims to investigate the irregular propagation characteristics of wireless sensor
network (WSN) at frequency of 433 MHz. Through the analysis of the received signal …
network (WSN) at frequency of 433 MHz. Through the analysis of the received signal …