The influence of non-metric distance on classical clustering algorithms is discussed in detail,and a clustering model based on directed-graph and directed-tree is proposed.

This model includes four sub-models a half-synchronized neighbor discovery mechanism,a routing metric with characterized radio,a layered information distribution system,and a reasonable routing algorithm The model multi-radio diversity and employed layered collaboration to s.

According to the real background of repair and supply of valuable spare parts in the weapon equipment of the PLA,using the research results of the repairable inventory theory,the inventory model of the valuable spare parts in three-echelon repair and supply system was established through expanding the classical METRIC model and theory.

Effect of Distance between Clamp and Cutting Notch on Plywood Bond Strength Testing;

Measurement of the distance between uretero and uterine neck in the condition of enlargement of uterine neck;

Study on the Correlation of Distance and Angle with the Image of Laryngostroboscope;

Joint frequency、direction of arrival and range estimation for near-field sources;

The speed of moving-target was measured based on the principle of PD frequency shift,and the range of moving-target on the pulse-echo principle.

For the accuracy of range information is higher than that of azimuth information received by networking radar system,three-dimension target location based on range only is proposed by using the linear least square iteration algorithm.