Cognition function of brain was simulated by artificial nerve network by changing thresholdlimitvalue of linking point.
人工神经网络模拟大脑的认知功能，通过改变连接点的权值和阈值来训练神经网络完成特定的功能。
2
OBJECTIVE: To assess the effect of blood lead level on t cell subgroup of children, and the association of t cell subgroup with thresholdlimitvalue of blood lead level.
目的：评估血铅对儿童T细胞亚群的影响，以及血铅临界值与T细胞亚群的关系。
3
Objective: To investigate the acute and accumlative toxicities of hydroquinone in mice and rats and to provide the information for establishing the thresholdlimitvalue of hydroquinone.