PSO’s precursor was a simulator of social behavior, that was used to visualize the movement of a birds’ flock. Several versions of the simulation model were developed, incorporating concepts such as nearest-neighbor velocity matching and accele

基于PCA特征提取和距离哈希K近邻分布的人脸表情识别-PCA-based feature extraction and distribution of K-nearest neighbor distance hash Facial Expression Recognition

室内无线定位技术 室内无线定位技术可以这样分成三类：近邻法、三边（角）测量法、模式匹配法。-Indoor wireless positioning technology indoor wireless location technology can be divided into three categories: nearest neighbor, trilateral (angle) measurement method, pattern matching method.