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Li Baowei 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.5
Ingredient manipulations of raw materials were always an important issue in the field of recycling silicate solid wastes of mining and metallurgy processes. For this purpose, glass-ceramics of CaO-MgO-Al2O3-SiO2 quaternary system were successfully produced by the method of melting, using Baiyunebo east mine tailing and fly ash as main sources of raw materials. The effect of carbon powder variation on the crystallization, and properties of the glass-ceramics were systematically investigated by differential thermal analysis (DTA), X-ray diffraction (XRD), Raman microscopy, scanning electron microscope (SEM) and mechanical testing. The results showed though carbon powder addition cannot change the formation of main crystal phase (augite), the concentration of this primary crystalline phase can be enhanced with the increase of the carbon powder addition to 5.6 wt%. As a result, the density, bending strength, acid-resistance and activation energy of the materials can be manipulated accordingly. And the mechanism of our manipulating process was close related to the reduction effect of carbon powder on decreasing the valence and concentration of iron ion within the studied glass ceramics.
Numerical simulations of a horizontal axis water turbine designed for underwater mooring platforms
Wenlong Tian,Baowei Song,James H. VanZwieten,Parakram Pyakurel,Yanjun Li 대한조선학회 2016 International Journal of Naval Architecture and Oc Vol.8 No.1
In order to extend the operational life of Underwater Moored Platforms (UMPs), a horizontal axis water turbine is designed to supply energy for the UMPs. The turbine, equipped with controllable blades, can be opened to generate power and charge the UMPs in moored state. Threedimensional Computational Fluid Dynamics (CFD) simulations are performed to study the characteristics of power, thrust and the wake of the turbine. Particularly, the effect of the installation position of the turbine is considered. Simulations are based on the Reynolds Averaged Navier- Stokes (RANS) equations and the shear stress transport k-u turbulent model is utilized. The numerical method is validated using existing experimental data. The simulation results show that this turbine has a maximum power coefficient of 0.327 when the turbine is installed near the tail of the UMP. The flow structure near the blade and in the wake are also discussed.
SLQE : An Improved Link Quality Estimation based on Four-bit LQE
An Zhou,Baowei Wang,Xingming Sun,Xingang You,Huiyu Sun,Tao Li 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.1
Link quality estimation (LQE) is an effective basic building block in wireless sensor networks (WSNs) and higher cross layer design of network protocol. Some researchers have investigated the statistical properties of the link quality estimators independently from higher-layer protocols, and their impact on the Collection Tree Routing Protocol (CTP). Then they set up a dedicated LQE, independent of the protocol interface, which has in total of four bits information: one from the physical layer, one from the link layer, and two from the network layer. Four-bit has been found to be a good estimator; however its performance heavily depends on the tuning of its parameters. But we found that Four-bit couldn’t be working effectively in responding to the burst situation after repeated experiments. So we redesigned the link estimation method, called Stable Link Quality Estimation (SLQE), which combines active probing with passive snooping to make estimation more stable. We have found that the new design can cope with the emergency. Moreover it also enhances the robustness of the network, and saves the overall energy consumption of the network.
2C-CTP : A Centralized Clustering Data Collection Protocol based on CTP
Lingyun Xu,Tao Li,Baowei Wang,Xingming Sun,Xingang You,Yanhua Zhu 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.9
WSN (wireless sensor network) is widely applied in environmental monitoring, assets tracking, battlefield monitoring and smart building. Since nodes in WSN are constrained by finite battery power and operational capability, it will have the direct effects on the lifetime of whole network. Well-designed routing protocols could make network succinct and efficient. In order to prolong the overall lifetime of WSN, lots of clustering algorithms have been proposed. Most of them are based on LEACH and proved energy-efficient, but few are implemented in real systems. CTP (collection tree protocol) has been extensively used in many systems and provides a reliable protocol for data collection. However, it neither considers energetic balance nor follows clustering feature. In this paper, we propose an efficient routing protocol by improving the CTP, adding clustering and centrally controlled features. Furthermore, we introduce a lightweight method of command distribution and some implementation technologies of clustering based on CTP. The related experiments that carried on TelosB demonstrate that our scheme is outstanding in lifetime and efficiency.
Numerical simulations of a horizontal axis water turbine designed for underwater mooring platforms
Tian, Wenlong,Song, Baowei,VanZwieten, James H.,Pyakurel, Parakram,Li, Yanjun The Society of Naval Architects of Korea 2016 International Journal of Naval Architecture and Oc Vol.8 No.1
In order to extend the operational life of Underwater Moored Platforms (UMPs), a horizontal axis water turbine is designed to supply energy for the UMPs. The turbine, equipped with controllable blades, can be opened to generate power and charge the UMPs in moored state. Three-dimensional Computational Fluid Dynamics (CFD) simulations are performed to study the characteristics of power, thrust and the wake of the turbine. Particularly, the effect of the installation position of the turbine is considered. Simulations are based on the Reynolds Averaged Navier-Stokes (RANS) equations and the shear stress transport ${\kappa}-{\omega}$ turbulent model is utilized. The numerical method is validated using existing experimental data. The simulation results show that this turbine has a maximum power coefficient of 0.327 when the turbine is installed near the tail of the UMP. The flow structure near the blade and in the wake are also discussed.
Xingming Sun,Yachao Hu,Baowei Wang,Jian Zhang,Tao Li 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.8
Localization systems have been identified as key issues in the development and operation of wireless sensor networks. The global positioning system (GPS) solves the problem about localization, but it is not suitable for wireless sensor networks. Due to range-free localization approaches requiring low equipped hardware and easy to implement, it is widely used in WSNs localization system. When the node communication radius increases, the accuracy of area-based localization is reduced. It is important to improve the localization accuracy in this situation. In this paper, to improve the accuracy of the node localization, we propose a new range-free localization using Voronoi diagrams based approximate point-in-triangulation test (APIT) algorithm. We compare our algorithm with APIT. Simulation results show that the VPIT improved the precision of localization by narrowing the node's geometry region.