Electromechanical Institute;
Yantai University;
Yantai 264005;
Shandong Province;
P. R. China;
Construction Engineering Institute;
Harbin Engineering Universit Harbin 150001;
P. R. China;
Photoelectrical Institute;
Yantai University;
Yantai 264005;
Shandong Province;
P. R. China;
Yantai Technology College;
Yantai 264005;
Shandong Province;
P. R. China;