基于P300高性能BCI打字机的研究与实现

利用Gleeble-3800数字控制热/力模拟试验机研究了Q690低碳微合金钢在变形温度850~1150 ℃，应变速率0.01~30 s-1条件下的高温单道次压缩变形行为.建立了基于动态材料模型(DMM)的加工图，结合OM观察变形体微观组织确定了该钢种的高温热变形机制.结果表明：应变量0.7及以下的加工图中包含2个峰区(1 000~1 120 ℃，0.01~0.37 s-1和1 100~1 150 ℃，3.16~30 s-1)和3个加工失稳区(850~900 ℃，0.01~0.32 s-1和850~900 ℃，10~30 s-1以及1 000~1 085 ℃，1~30 s-1).应变量超过0.8的加工图包含2个峰区(1 025~1 100 ℃，0.01~0.38 s-1和1 100~1 150 ℃，3~30 s-1)，失稳区为低温(850~900 ℃，0.01~30 s-1)以及应变速率1 s-1以上的中低温度(850~1 100 ℃)范围，在这两个峰区峰值点附近的热变形显微组织为均匀的完全动态再结晶组织，因此，这两个区域均适合Q690钢的热加工变形.

Research and Implementation of High Performance BCI Typewriter Based on P300

With the development of science and technology, people for the improvement of computer ability is strong, so as to promote the ever-accelerated development of human-computer interaction technology. Similar to the traditional way of human-computer interaction (keyboard, mouse, remote controller, etc.), Brain Computer Interface (BCI) technology is also can be used as a way of human-computer interaction. In the input of characters, previous induced interface commonly used 6 x 6 matrix (26 letters and 10 Arabic numbers), and according to certain order to arrange and use cross column mode to flicker, then use P300 to analyze the entered characters. This paper, in accordance with the letters appear at a certain different frequency and in a certain way to combine different induced interface , by comparison to find high performance BCI typewriter. Provide some necessary reference basis for the application of the future BCI system induced interface application.