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The privacy protection method based on location service in the road network only focuses on the location privacy of users. When the query content proposed by the anonymous set mostly belongs to the same category, it is prone to homogeneity attack. Aiming at this problem, this paper proposes a privacy protection algorithm called V-L based on the (K, L) anonymous model. The algorithm first uses voronoi diagram to process the road network into independent voronoi diagram unit or known as V diagram unit, and then selects the anonymous set that satisfies (K, L) anonymous model in the current V diagram unit for the user, and finally adds false user to the anonymous set that does not satisfy (K,L) anonymous model, and randomly selects the location of the current V diagram unit to replace the real location of the user. The algorithm is verified by the data of Lanzhou road network. Experimental results show that on the basis of query cost slightly higher than traditional algorithms, the anonymous success rate of the proposed algorithm can be guaranteed to be 100%, and the average anonymous time is about 1ms. It is proved that the algorithm we proposed achieves a good balance between privacy protection intensity and algorithm performance.

Objective To observe treatment effect of creatine phosphate sodium referred to as CP) on reversion of diastolic dysfunction. Methods According to the 2007 European Society of Cardiology diagnostic process of diastolic heart failure and Guo-jihong (new concept of diastolic heart failure), screening out the total number of 212 patients with diastolic dysfunction, 134 were males, 78 females, average aged 52±6 years old and were randomly divided into two groups CP group and control group. All patients received treatment according to American Association 2006 Guide of diastolic heart failure. CP group on the basis of this treatment plus (CP2g +5% glucose or 0.9% sodium chloride 100 ml intravenous drip). And using colour Doppler echocardiography to detect transmitral peak early diastolic velocity (E-wave), transmitral peak late diastolic velocity (A-wave), peak early diastolic velocity of mitral annulus (Ea), and peak late diastolic velocity of mitral annulus (Aa), and the value of E/A, Ea/Aa, E/Ea were calculated. Mild diastolic dysfunction (E/A Results All patients of CP group had significantly improved signs and symptoms, the clinical effective rate was 96.2%, control group was 57.1% (p Conclusion CP has significant effect to improve and reverse the diastolic dysfunction.