Yu X.,Engineering University of Armed Police Force
Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology | Year: 2015
In order to exploit spatial multiplexing gain and multiuser diversity gain for multiuser multi-input multi-output(MIMO)system, a joint optimization of both Tomlinson-Harashima precoding(THP)scheme and multiuser scheduling algorithm is proposed. Unlike traditional THP scheme, the proposed THP scheme can be applied to the case where the number of data streams are less that of receive antennas for each user, which can greatly improve the system sum rate by exploiting the multi-antenna receiving diversity of multiuser MIMO systems. Because the optimal scheduling algorithm for the multiuser MIMO system with the proposed THP scheme has very high computational complexity, a suboptimal scheduling algorithm with low computational complexity is proposed, which greedily schedules users by utilizing the layered precoding. Simulation results demonstrate that the performance of the proposed scheduling is near to that of the optimal scheduling scheme, and outperforms that of the traditional scheduling scheme. ©, 2015, Nanjing University of Science and Technology. All right reserved.
Duan D.,Engineering University of Armed Police Force
Complex Systems and Complexity Science | Year: 2015
To better explore the universal robustness against cascading failures on complex networks, closely focusing on the load which is the most important physical quantity that can affect the spread of cascading failure, and dynamic process after a node fails, a cascading failure model with tunable parameters is proposed based on the local characteristic of node. With this model we study the cascading failure condition of ER and BA networks, and obtain the formula of phase transition point theoretically. The relationship between the robustness against cascading failures on complex networks and parameters in the model, including the topology parameters, the initial load coefficient, and the redistribution coefficient, is discussed numerically. In addition, theoretical results also are verified by the simulation results of the ER and BA networks. ©, 2015, The Journal Agency of Complex Systems and Complexity Science. All right reserved.
Kong W.,Engineering University of Armed Police Force
Infrared Physics and Technology | Year: 2014
A novel image fusion technique based on NSST (non-subsampled shearlet transform) is presented, aiming at resolving the fusion problem of spatially gray-scale visual light and infrared images. NSST, as a new member of MGA (multi-scale geometric analysis) tools, possesses not only flexible direction features and optimal shift-invariance, but much better fusion performance and lower computational costs compared with several current popular MGA tools such as NSCT (non-subsampled contourlet transform). We specifically propose new rules for the fusion of low and high frequency sub-band coefficients of source images in the second step of the NSST-based image fusion algorithm. First, the source images are decomposed into different scales and directions using NSST. Then, the model of region average energy (RAE) is proposed and adopted to fuse the low frequency sub-band coefficients of the gray-scale visual light and infrared images. Third, the model of local directional contrast (LDC) is given and utilized to fuse the corresponding high frequency sub-band coefficients. Finally, the final fused image is obtained by using inverse NSST to all fused sub-images. In order to verify the effectiveness of the proposed technique, several current popular ones are compared over three different publicly available image sets using four evaluation metrics, and the experimental results demonstrate that the proposed technique performs better in both subjective and objective qualities. © 2013 Elsevier B.V. All rights reserved.
Yang C.,Engineering University of Armed Police Force
Advances in Information Sciences and Service Sciences | Year: 2012
Building energy efficiency is a very effective way of energy-saving of green house, and intelligent technology is also a very important means of building energy efficiency. However, how the intelligent building energy-saving, due to the appropriate means of assessment was not established and no data to support. Intelligent building energy evaluation system for building energy consumption measurement, statistics, analysis and energy assessment in order to support the intelligent building energy-saving theory and data. This paper presents intelligent building in the new green building energy saving system based on CFD, and analyses intelligent building energy-saving evaluation system. The article extends the construction of intelligent content; enrich the connotation of the intelligent building, promoting intelligent building energy efficiency, with a strong use value and practical significance.
Duan D.-L.,Engineering University of Armed Police Force
Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice | Year: 2015
To maintain high level of mission reliability, phased mission system generally takes both device backup measure and execution plan backup measure in the process of task execution. A Markov reliability evaluation model of the system is proposed by analyzing state transition relationship and state mapping relationship between two consecutive stages in this paper. An optimization model for mission reliability is put forward with task execution plan as its strategic variable, mission reliability as optimization objective and device working hours as constraints. The typical example shows the rationality and effectiveness of the proposed model in PMS. ©, 2015, Systems Engineering Society of China. All right reserved.