Five major brain waves can be distinguished by their frequency ranges:
|frequency band|frequency range|
|—–|—-|—-|
|delta|0.5-4Hz|appears for continuous-attention tasks|
|theta|4-8Hz|spikes when repressing(抑制) a response or action|
|alpha|8-13Hz|measures relax or closing eyes|
|beta|13-30Hz|reflects active thinking,focus,high alert or anxiety|
|gamma|30-50Hz|displays during cross-modal sensory processing|
表面上为私有，实际在外部可以访问
实际上的私有，只能在内部访问，不能在外部访问（报错）
魔法方法（magic method）/ 特殊方法
class TestPrivacy(object):
_name = 'hello'
__name = 'world'
print(TestPrivacy._name) # Output:'hello'
print(TestPrivacy.__name) # Output: AttributeError: type object 'TestPrivacy' has no attribute '__name'
Web服务器是可以向发出请求的浏览器提供文档的程序。
# coding:utf-8
import socket
import re
from multiprocessing import Process
# 设置静态文件根目录
HTML_ROOT_DIR = "./html"
def handle_client(client_socket):
"""处理客户端请求"""
# 获取客户端请求数据
request_data = client_socket.recv(1024)
print("request data:",request_data)
request_lines = request_data.splitlines()
for line in request_lines:
print(line)
# 解析请求报文
# 'GET / HTTP/1.1'
request_start_line = request_lines[0]
#提取用户请求的文件名
file_name = re.match(r"\w+ +(/[^ ]*) ",request_start_line.decode("utf-8")).group(1)
if "/" == file_name:
file_name = "/index.html"
# 打开文件，读取内容
try:
file = open(HTML_ROOT_DIR + file_name,"rb")
except IOError:
response_start_line = "HTTP/1.1 404 Not Found\r\n"
response_headers = "Server: My server\r\n"
response_body = "the file is not found"
else:
file_data = file.read()
file.close()
# 构造响应数据
response_start_line = "HTTP/1.1 200 OK\r\n"
response_headers = "Server: My server\r\n"
response_body = file_data.decode("utf-8")
response = response_start_line + response_headers + "\r\n" + response_body
print("response:",response)
# 向客户端返回响应数据
client_socket.send(bytes(response,"utf-8"))
#关闭客户端链接
client_socket.close()
def main():
server_socket = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
#SOL_SOCKET:设置选项级别为SOCKET
#SO_REUSEADDR:1
server_socket.bind(("",7788))
server_socket.listen(128)
while True:
client_socket,client_address= server_socket.accept()
print("[%s,%s]用户连接上了"%(client_address))
handle_client_process = Process(target=handle_client,args=(client_socket,))
handle_client_process.start()
client_socket.close()
if __name__ == "__main__":
main()
在浏览器地址栏输入 127.0.0.1:7788或127.0.0.1:7788/index.html
利用问题的解与其子问题的解之间的关系（动态规划方程），以自底向上的方式递归地从子问题的最优解逐步构造出整个问题的解的算法
将一个问题分为若干个子问题，将这些子问题分别求解；将求出的小规模的子问题的解合并为一个更大规模的问题的解，自底向上求出原来问题的解
分治：自顶向下
动态规划：自底向上
dynamic-program(P)
{
for(i=1;i<=n;i++)
{
compute(solution of each Pi);//解规模为i的各子问题
use(solution of each Pi) merge(solution of each Pi+1);
//将规模为i的各子问题的解合并为规模为i+1的问题的解
}
}
EEG Pathology Detection Based on Deep Learning
Method One:Shallow CNN Model
Method Two:Deep CNN Model(AlexNet)
Method Three:Fusion stategy based on a multiplayer perception
Fusion of CNN features of several distinct temporal segments of the EEG signal
In future study:investigate different fusion strategies