Improved artificial bee colony algorithm based gravity matching navigation method.

Gravity matching navigation algorithm is one of the key technologies for gravity aided inertial navigation systems. With the development of intelligent algorithms, the powerful search ability of the Artificial Bee Colony (ABC) algorithm makes it possible to be applied to the gravity matching navigation field. However, existing search mechanisms of basic ABC algorithms cannot meet the need for high accuracy in gravity aided navigation. Firstly, proper modifications are proposed to improve the performance of the basic ABC algorithm. Secondly, a new search mechanism is presented in this paper which is based on an improved ABC algorithm using external speed information. At last, modified Hausdorff distance is introduced to screen the possible matching results. Both simulations and ocean experiments verify the feasibility of the method, and results show that the matching rate of the method is high enough to obtain a precise matching position.

[Comparative observation on curative effects of stenosing tenovaginitis of flexor digitorum treated with acupuncture knife therapy and blocking therapy].

OBJECTIVE: To compare the curative effects on stenosing tenovaginitis of flexor digitorum treated with acupuncture knife therapy and blocking therapy so as to explore the better method. METHODS: Three hundred and four cases were randomly divided into acupuncture knife therapy group (164 cases) and blocking therapy group (140 cases). In acupuncture knife therapy group, hooking and cutting were applied on the pressure points and scleromas with Ren's hooked acupuncture knife; routine blocking therapy was applied in blocking therapy group. The curative effects of both groups after 1-2 treatments and the recurrence after treatment in following 6 months were observed. RESULTS: The curative rate was 98.2% (161/164)in acupuncture knife therapy group, superior to that of 65.7% (92/140) in blocking therapy group; the recurrence rate was 1.9% (3/161) in acupuncture knife therapy group, inferior to that of 37.0% (34/92) in blocking therapy group. The differences are significant between groups (both P < 0.01). CONCLUSION: The curative effect of stenosing tenovaginitis of flexor digitorum treated with acupuncture knife therapy is superior to that of blocking therapy, with low recurrence rate.