Power Efficient Visible Light Communication (VLC) with Unmanned Aerial Vehicles (UAVs)

A novel approach that combines visible light communication (VLC) with unmanned aerial vehicles (UAVs) to simultaneously provide flexible communication and illumination is proposed. To minimize the power consumption, the locations of UAVs and the cell associations are optimized under illumination and communication constraints. An efficient sub-optimal solution that divides the original problem into two sub-problems is proposed. The first sub-problem is modeled as a classical smallest enclosing disk problem to obtain the optimal locations of UAVs, given the cell association. Then, assuming fixed UAV locations, the second sub-problem is modeled as a min-size clustering problem to obtain the optimized cell association. In addition, the obtained UAV locations and cell associations are iteratively optimized multiple times to reduce the power consumption. Numerical results show that the proposed approach can reduce the total transmit power consumption by at least 53.8% compared to two baseline algorithms with fixed UAV locations.Comment: 4 pages, 4 figures. Accepted for publication in IEEE Communications Letter

Combining Channel Theory, HowNet and Extension Model to Analyze Big Data

AbstractBecause the diversity of unstructured data has brought new challenges to big data analysis, this paper proposes to combine Channel theory, HowNet and extension model to improve big data analysis ability. The paper proposes a new method to process big data, which is based on the Channel theory idea and HowNet structure, in order to overcome the semantic conflicts of big data. In view of the problems that people are difficult to analyze their big data in order to get profits, the paper proposes a case study to show the effective of our method

A Novel Received Signal Strength Assisted Perspective-three-Point Algorithm for Indoor Visible Light Positioning

In this paper, a received signal strength assisted Perspective-three-Point positioning algorithm (R-P3P) is proposed for visible light positioning (VLP) systems. The basic idea of R-P3P is to joint visual and strength information to estimate the receiver position using 3 LEDs regardless of the LEDs' orientations. R-P3P first utilizes visual information captured by the camera to estimate the incidence angles of visible lights. Then, R-P3P calculates the candidate distances between the LEDs and the receiver based on the law of cosines and the Wu-Ritt's zero decomposition method. Based on the incidence angles, the candidate distances and the physical characteristics of the LEDs, R-P3P can select the exact distances from all the candidate distances. Finally, the linear least square (LLS) method is employed to estimate the position of the receiver. Due to the combination of visual and strength information of visible light signals, R-P3P can achieve high accuracy using 3 LEDs regardless of the LEDs' orientations. Simulation results show that R-P3P can achieve positioning accuracy within 10 cm over 70% indoor area with low complexity regardless of LEDs orientations.Comment: arXiv admin note: substantial text overlap with arXiv:2004.0629

External application of Ruyi Jinhuang powder for phlebitis: A systematic review and meta-analysis

Purpose: To systematically review the effectiveness of the external application, Ruyi Jinhuang powder, on phlebitis Methods: Relevant literature was retrieved from Medline, Embase, China National Knowledge Infrastructure database (CNKI), Cochrane Central Register, Chongqing Vip, Wanfang Data and SinoMed using the search terms “Ruyi Jinhuang San”, “Ruyi Jinhuang powder”, “Ruyi Jinhuang cream”, “Agreeable golden powder”, “satisfactory golden powder”, “Jinhuang cream”, “phlebitis”, “prevention and (or) treatment”, “randomized controlled trials” and “RCRs”. Two researchers independently arranged and analyzed the data. Results: Significant differences were observed in the total effectiveness rate of Ruyi Jinhuang powder [relative risk (RR) = 1.27, 95% confidence interval (CI) = 1.19 to 1.36, and p < 0.0001). Ruyi Jinhuang powder can reduce the incidence of phlebitis versus conventional therapy in preventing phlebitis (RR = 0.32, 95 % CI 0.24 to 0.42, and p < 0.0001). Shorten the average healing time [mean difference (MD) =- 32.17, 95 % CI= -48.39 to -15.94, and p = 0.0001). Reduced pain relief time for phlebitis (MD = -3.29, 95% CI -5.42 to -1.16, and p = 0.002). However, no statistical difference was observed with regard to the onset time of phlebitis (MD = -0.62, 95 % CI -1.76 to 0.52, and p = 0.29). Conclusion: Clinicians consider Ruyi Jinhuang powder a viable complementary and alternative medicine for phlebitis following the stronger evidence being offered

Nash's Existence Theorem for Non-compact Strategy Sets

This paper generalizes the Fan-Knaster-Kuratowski-Mazurkiewicz (FKKM) lemma to the case of weak topology, and obtains the Ky Fan minimax inequality defined on non-empty non-compact convex subsets in reflexive Banach spaces, then we apply it to game theory and obtain Nash's existence theorem for non-compact strategy sets, together with John von Neumann's existence theorem in two-player zero-sum games.Comment: 8 page