|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Utility function based fair data scheduling algorithm for OFDM wireless network显示文摘A system model is formulated as the maximization of a total utility function to achieve fair downlink data scheduling in multiuser orthogonal frequency division multiplexing (OFDM) wireless networks. A dynamic subcarrier allocation algorithm (DSAA) is proposed, to optimize the system model. The subcarrier allocation decision is made by the proposed DSAA according to the maximum value of total utility function with respect to the queue mean waiting time. Simulation results demonstrate that compared to the conventional algorithms, the proposed algorithm has better delay performance and can provide fairness under different loads by using different utility functions. | Guo Kunqi Sun Lixin Jia Shilou | 2007 | Journal of Systems Engineering and Electronics2007，18，4： | 3 |
| 2 | Channel-aware and queue-aware joint-layer resource optimization for cognitive radio networks显示文摘An optimization model is derived to maximize the utilization efficiency of the idle channels of primary users(PU) in cognitive radio networks.In the optimization model,Lyapunov optimization method is used to allocate the idle channels of PU to secondary user(SU) most efficiently.The time distribution of the idle channels of PU is predicted by a low-pass time window.An algorithm is proposed to implement the optimization process.The algorithm is efficient because of using a greedy selection mechanism.The efficiency of the algorithm is demonstrated by mathematic analyses and simulation results. | GUO KunQi SUN LiXin LI Yong JIA ShiLou | 2010 | Science China(Information Sciences)2010，53，12： | 2 |
| 3 | Efficiency-aware and fairness-aware joint-layer optimization for downlink data scheduling in OFDM显示文摘Efficiency and fairness are two crucial issues to be considered for resource alloca- tion in multi-user wireless networks.Based on the joint optimization of physical layer and data link layer,an optimization model is derived to achieve efficient and fair downlink data scheduling in multi-user OFDM wireless networks by maximizing the total utility function with respect to the average waiting time of user queue.A dynamic sub-carrier allocation algorithm(DSAA)based on the optimization model is proposed in order to obtain the maximization of the total scheduling utility.Effi- ciency is improved by combining DSAA with time scale interference predictor(TSIP) which at large time scales predict ON/OFF period of user data with temporal corre- lation structure across multiple time scales in multi-user interference environment. Simulation results verify the efficiency and fairness of the scheme. | GUO KunQi SUN LiXin WANG Ping JIA ShiLou | 2008 | Science in China(Series F)2008，51，2： | 1 |
| 4 | Heuristic based data scheduling algorithm for OFDMA wireless network显示文摘A system model based on joint layer mechanism is formulated for optimal data scheduling over fixed point-to-point links in OFDMA ad-hoc wireless networks. A distributed scheduling algorithm (DSA) for system model optimization is proposed that combines the randomly chosen subcarrier according to the channel condition of local subcarriers with link power control to limit interference caused by the reuse of subcarrier among links. For the global fairness improvement of algorithms, a global power control scheduling algorithm (GPCSA) based on the proposed DSA is presented and dynamically allocates global power according to difference between average carrier-noise-ratio of selected local links and system link protection ratio. Simulation results demonstrate that the proposed algorithms achieve better efficiency and fairness compared with other existing algorithms. | Guo Kunqi Sun Lixin Jia Shilou Yu Xiaoyang | 2008 | Journal of Systems Engineering and Electronics2008，19，1： | 0 |
| 5 | Toplayer-dependent crystallographic orientation imaging in the bilayer two-dimensional materials with transverse shear microscopy显示文摘Nanocontact properties of two-dimensional(2D)materials are closely dependent on their unique nanomechanical systems,such as the number of atomic layers and the supporting substrate.Here,we report a direct observation of toplayer-dependent crystallographic orientation imaging of 2D materials with the transverse shear microscopy(TSM).Three typical nanomechanical systems,MoS_(2) on the amorphous SiO_(2)/Si,graphene on the amorphous SiO_(2)/Si,and MoS_(2) on the crystallized Al_(2)O_(3),have been investigated in detail.This experimental observation reveals that puckering behaviour mainly occurs on the top layer of 2D materials,which is attributed to its direct contact adhesion with the AFM tip.Furthermore,the result of crystallographic orientation imaging of MoS_(2)/SiO_(2)/Si and MoS_(2)/Al_(2)O_(3) indicated that the underlying crystalline substrates almost do not contribute to the puckering effect of 2D materials.Our work directly revealed the top layer dependent puckering properties of 2D material,and demonstrate the general applications of TSM in the bilayer 2D systems. | Sabir Hussain Rui Xu Kunqi Xu Le Lei Shuya Xing Jianfeng Guo Haoyu Dong Adeel Liaqat Rashid Iqbal Muhammad Ahsan Iqbal Shangzhi Gu Feiyue Cao Yan Jun Li Yasuhiro Sugawara Fei Pang Wei Ji Liming Xie Shanshan Chen Zhihai Cheng | 2021 | Frontiers of physics2021，16，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员