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Application Layer Multicast Model with Low Delay and High Stability
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作者 廖小飞 宣益亮 +1 位作者 宿轩策 李德敏 《Journal of Donghua University(English Edition)》 CAS 2023年第1期74-79,共6页
As an alternative of Internet protocol(IP)multicast,application layer multicast(ALM)is widely used with the advantage of simplicity and flexibility.However,the existing problems of large transmission delay and poor st... As an alternative of Internet protocol(IP)multicast,application layer multicast(ALM)is widely used with the advantage of simplicity and flexibility.However,the existing problems of large transmission delay and poor stability limit the application and development.In this article,to solve these problems,an ALM model based on node potential(NP)and topological index(TI)is proposed.The proposed model considers the factors of node capability and node distance in constructing and maintaining multicast tree to reduce transmission delay and increase stability,and thus it improves the application level in real-time multimedia multicast.The computer simulations prove that the proposed model reduces the ALM transmission delay,increases multicast tree stability effectively,and improves the ALM performance,and therefore it is suitable to apply in large-scale real-time multimedia environment. 展开更多
关键词 application layer multicast(ALM) high stability low delay node potential(NP) topological index(TI)
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Effects of Phosphorus Application in Different Soil Layers on Root Growth, Yield, and Water-Use Efficiency of Winter Wheat Grown Under Semi-Arid Conditions 被引量:5
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作者 KANG Li-yun YUE Shan-chao LI Shi-qing 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2014年第9期2028-2039,共12页
Deep phosphorus application can be a usefull measure to improve crops' performance in semi-arid regions, but more knowledge of both its general effects and effects on specific crops is required to optimize treatments... Deep phosphorus application can be a usefull measure to improve crops' performance in semi-arid regions, but more knowledge of both its general effects and effects on specific crops is required to optimize treatments. Thus, the aims of this study were to evaluate the effects of phosphorus(P) application at different soil layers on root growth, grain yield, and water-use efficiency(WUE) of winter wheat grown on the semi-arid Loess Plateau of China and to explore the relationship between root distribution and grain yield. The experiment consisted of four P treatments in a randomized complete block design with three replicates and two cultivars: one drought-sensitive(Xiaoyan 22, XY22) and one drought-tolerant(Changhan 58, CH58). The four P treatments were no P(control, CK), surface P(SP), deep P(DP), and deep-band P application(DBP). CH58 produced larger and deeper root systems, and had higher grain yields and WUE, under the deep P treatments(DP and DBP) than under SP, clearly showing that deep P placement had beneficial effects on the drought-tolerant cultivar. In contrast, the grain yield and root growth of XY22 did not differ between DP or DBP and SP treatments. Further, root dry weight(RW) and root length(RL) in deep soil layer(30-100 cm) were closely positively correlated with grain yield and WUE of CH58(but not XY22), highlighting the connections between a well-developed subsoil root system and both high grain yield and WUE for the drought-tolerant cultivar. WUE correlated strongly with grain yield for both cultivars(r=0.94, P〈0.001). In conclusion, deep application of P fertilizer is a practical and feasible means of increasing grain yield and WUE of rainfed winter wheat in semi-arid regions, by promoting deep root development of drought-tolerant cultivars. 展开更多
关键词 water stress phosphorus application soil layers grain yield root growth water-use efficiency
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Architecture design and demand analysis on application layer of standard system for ubiquitous power Internet of Things 被引量:4
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作者 Jing Zhang Yunying Ye +1 位作者 Chunjin Hu Bin Li 《Global Energy Interconnection》 EI CAS CSCD 2021年第3期304-314,共11页
The ubiquitous power Internet of Things(UPIoT)is an intelligent service system with comprehensive state perception,efficient processing,and flexible application of information.It focuses on each link of the power syst... The ubiquitous power Internet of Things(UPIoT)is an intelligent service system with comprehensive state perception,efficient processing,and flexible application of information.It focuses on each link of the power system and makes full use of the mobile internet,artificial intelligence,and other advanced information and communication technologies in order to realize the inter-human interaction of all things in all links of the power system.This article systematically presents to the national and international organizations and agencies in charge of UPIoT layer standardization the status quo of the research on the Internet of Things(IoT)-related industry standards system.It briefly describes the generic standard classification methods,layered architecture,conceptual model,and system tables in the UPIoT application layer.Based on the principles of inheritance,innovation,and practicability,this study divides the application layer into customer service,power grid operation,integrated energy,and enterprise operation,emerging business and analyzes the standard requirements of these five fields.This study also proposes a standard plan.Finally,it summarizes the research report and provides suggestions for a follow-up work. 展开更多
关键词 Ubiquitous power Internet of Things(UPIoT) application layer Standard system Architecture design Demand analysis
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Survey on recent advances in IoT application layer protocols and machine learning scope for research directions 被引量:1
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作者 Praveen Kumar Donta Satish Narayana Srirama +1 位作者 Tarachand Amgoth Chandra Sekhara Rao Annavarapu 《Digital Communications and Networks》 SCIE CSCD 2022年第5期727-744,共18页
The Internet of Things(IoT)has been growing over the past few years due to its flexibility and ease of use in real-time applications.The IoT's foremost task is ensuring that there is proper communication among dif... The Internet of Things(IoT)has been growing over the past few years due to its flexibility and ease of use in real-time applications.The IoT's foremost task is ensuring that there is proper communication among different types of applications and devices,and that the application layer protocols fulfill this necessity.However,as the number of applications grows,it is necessary to modify or enhance the application layer protocols according to specific IoT applications,allowing specific issues to be addressed,such as dynamic adaption to network conditions and interoperability.Recently,several IoT application layer protocols have been enhanced and modified according to application requirements.However,no existing survey articles focus on these protocols.In this article,we survey traditional and recent advances in IoT application layer protocols,as well as relevant real-time applications and their adapted application layer protocols for improving performance.As changing the nature of protocols for each application is unrealistic,machine learning offers means of making protocols intelligent and is able to adapt dynamically.In this context,we focus on providing open challenges to drive IoT application layer protocols in such a direction. 展开更多
关键词 Internet of things Machine learning application layer Request-response protocols Publish-subscribe protocols
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The Application of Layered Progressive Teaching Method in Nursing Teaching of Health Management Centre 被引量:1
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作者 Xin Liu Xiaoying Qu 《Journal of Clinical and Nursing Research》 2020年第3期17-20,共4页
Objective:To explore the clinical effect of the layered progressive teaching method in the process of nursing teaching in the health management centre.Methods:100 nursing students in the health management centre of ou... Objective:To explore the clinical effect of the layered progressive teaching method in the process of nursing teaching in the health management centre.Methods:100 nursing students in the health management centre of our hospital were randomly divided into two groups from April 2018 to April 2019,in which students of the control group were treated with routine teaching,while those of the experimental group were treated with layered progressive teaching.Then,the teaching effect of the two groups was compared and analysed.Results:The assessment results of nursing students in the two groups were compared,in which the theoretical knowledge scores and practical operation scores of nursing students in the experimental group were(94.34±2.33)and(90.45±2.20)respectively.By contrast,the score of students in the control group was lower and the difference between the two groups was not significant(P<0.50).The teaching effect of students in the experimental group is more significant.Conclusion:During the process of nursing teaching in the Health Management Centre,the progressive teaching method showed a significant clinical effect and could effectively enhance students’scores.Therefore,it is positively significant for clinical development. 展开更多
关键词 layered progressive teaching method Health Management Centre Nursing teaching The application effect
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THE APPLICATION OF DYNAMICSCHLIEREN-PHOTON CORRELATIONTECHNIQUE TO A SUPERSONIC SHEAR LAYER
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作者 Xu LipingBeijing University of Aeronautics and Astronautics 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1990年第2期115-122,共8页
By applying the dynamic schlieren-photon correlation technique to a two dimensional separated supersonic shear layer, the convection velocity of large eddies inside the shear layer and the frequency of the self-sustai... By applying the dynamic schlieren-photon correlation technique to a two dimensional separated supersonic shear layer, the convection velocity of large eddies inside the shear layer and the frequency of the self-sustaining oscillation of the shear layer induced by the shedding of large eddies have been obtained. The distribution of the turbulence intensity inside the shear layer can also be estimated. It is shown that the method has its promising potentials in the measurement of high speed complex flows. 展开更多
关键词 THE application OF DYNAMICSCHLIEREN-PHOTON CORRELATIONTECHNIQUE TO A SUPERSONIC SHEAR layer HIGH
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Pseudohalide induced tunable electronic and excitonic properties in two-dimensional single-layer perovskite for photovoltaics and photoelectronic applications 被引量:1
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作者 Zhuo Xu Ming Chen Shengzhong(Frank)Liu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第9期106-113,共8页
Two-dimensional(2D) layered organic-inorganic hybrid perovskites have attracted much more attention for some applications than their three-dimensional(3D) perovskite counterparts due to their promising thermal and moi... Two-dimensional(2D) layered organic-inorganic hybrid perovskites have attracted much more attention for some applications than their three-dimensional(3D) perovskite counterparts due to their promising thermal and moisture stabilities.In particular, the 2D perovskite devices have shown better promise for optoelectronic applications.However, tunability of optoelectronic properties is often demanded to improve the device performance.Herein, we adopt a newly method to tune the electronic properties of 2D perovskite by introducing pseudohalide into the structure.In this work, we designed a pseudohalidesubstituted 2D perovskite by substituting the out-of-plane halide with pseudohalide and studied the electronic and excitonic properties of 2D-BA2MX4 and 2D-BA2MX2Ps2(M=Ge^(2+), Sn^(2+), and Pb^(2+);X=I;Ps=NCO, NCS, OCN, SCN, Se CN).We revealed the dependence of electronic properties including band gaps, composition of band edges, bonding characteristics, work functions, effective masses, and exciton binding energies on different pseudohalides substituted in 2D perovskite.Our results indicate that the substitution of pseudohalide in 2D perovskites is energetically favorable and can significantly affect the bonding characteristics as well as the CBM and VBM that often play major role in determining their performance in optoelectronic devices.It is expected that the pseudohalide substitution will be helpful in developing more advanced optoelectronic device based on 2D perovskite by optimizing band alignment and promoting charge extraction. 展开更多
关键词 Two-dimensional perovskites Pseudohalides Density functional theory Electronic and excitonic properties
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Application Analysis of Fine-grained Drainage Asphalt Surface Layer in Sponge Urban Road
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作者 Jibin Lu 《Journal of World Architecture》 2018年第4期1-6,共6页
With the overall progress and development of the market economy,the construction of sponge city has received extensive attention.To further create an environment more suitable for people’s lives,relevant departments ... With the overall progress and development of the market economy,the construction of sponge city has received extensive attention.To further create an environment more suitable for people’s lives,relevant departments should actively apply diversified materials and integrate material supervision mechanisms in the construction of sponge city roads,and construct a systematic road restraint mechanism and management system to ensure that the characteristics of the surface ecological environment can be fundamentally improved.This paper briefly analyzes the pavement structure design mechanism in combination with the engineering project.The application path of the finegrained drainage asphalt surface layer in the sponge city road is explained from the mix ratio of the mixture and the construction process.It is for reference only. 展开更多
关键词 FINE-GRAINED drainage ASPHALT surface layer SPONGE CITY construction application
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Modeling TCP Incast Issue in Data Center Networks and an Adaptive Application-Layer Solution
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作者 Jin-Tang Luo Jie Xu Jian Sun 《Journal of Electronic Science and Technology》 CAS CSCD 2018年第1期84-91,共8页
In data centers, the transmission control protocol(TCP) incast causes catastrophic goodput degradation to applications with a many-to-one traffic pattern. In this paper, we intend to tame incast at the receiver-side a... In data centers, the transmission control protocol(TCP) incast causes catastrophic goodput degradation to applications with a many-to-one traffic pattern. In this paper, we intend to tame incast at the receiver-side application. Towards this goal, we first develop an analytical model that formulates the incast probability as a function of connection variables and network environment settings. We combine the model with the optimization theory and derive some insights into minimizing the incast probability through tuning connection variables related to applications. Then,enlightened by the analytical results, we propose an adaptive application-layer solution to the TCP incast.The solution equally allocates advertised windows to concurrent connections, and dynamically adapts the number of concurrent connections to the varying conditions. Simulation results show that our solution consistently eludes incast and achieves high goodput in various scenarios including the ones with multiple bottleneck links and background TCP traffic. 展开更多
关键词 application-layer solution data center networks MODELING transmission control protocol(TCP) incast
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Vegetation of mono-layer landfill cover made of coal bottom ash and soil by compost application
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作者 Seul Bi Lee Sang Yoon Kim +2 位作者 Chan Yu Soon-Oh Kim Pil Joo Kim 《Journal of Agricultural Chemistry and Environment》 2013年第3期50-58,共9页
Monolayer barriers called evapotranspiration (ET) covers were developed as alternative final cover systems in waste landfills but high-quality soil remains a limiting factor in these cover systems. Coal bottom ash was... Monolayer barriers called evapotranspiration (ET) covers were developed as alternative final cover systems in waste landfills but high-quality soil remains a limiting factor in these cover systems. Coal bottom ash was evaluated to be a very good alternative to soil in previous tests and a combination of soil (65% wt.wt-1) and coal bottom ash (35% wt.wt-1) was evaluated to be the most feasible materials for ET cover systems. In our pot test, selected manure compost as soil amendment for the composite ET cover system, which was made of soil and bottom ash at ca. 40 Mg.ha-1 application level was very effective to promote vegetation growth of three plants;namely, garden cosmos (Cosmosbipinnatus), Chinese bushclover (Lespedezacuneata), and leafy lespedeza (Lespedeza cyrtobotrya). To evaluate the effect of compost application on plant growth in an ET vegetative cover system, two couples of lysimeters, packed with soil and a mixture of soil and bottom ash, were installed in a pilot landfill cover system in 2007. Manure composts were applied at the rates of 0 and ?40 Mg.ha-11before sowing the five plant species, i.e.indigo-bush (Amorphafruticosa), Japanese mugwort (Artemisia princeps, Arundinella hirta, Lespedezacuneata, and Lespedezacyrtobotrya). Unseeded native plant (green foxtail,Setaria viridis) was dominant in all treatments in the 1st year after installation while the growth of the sown plants significantly improved over the years. Total biomass productivity significantly increased with manure compost application, and more significantly increased in the composite ET cover made of soil and bottom ash treatment compared to the single soil ET cover, mainly due to more improved soil nutrient levels promoting vegetation growth and maintaining the vegetation system. The use of bottom ash as a mixing material in ET cover systems has a strong potential as an alternative to fine-grained soils, and manure compost addition can effectively enhance vegetative propagation in ET cover systems. 展开更多
关键词 Bottom ASH Coal ASH COMPOST application EVAPOTRANSPIRATION (ET) Cover Mono-layer Barrier
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Preparation,Characterization and Application of ZnAlLa-Hydrotalcite-Like Compounds 被引量:3
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作者 Xianmei Xie, Xia An, Xiulan Wang , Zhizhong WangCollege of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2003年第4期259-263,共5页
The preparation of ZnAlLa-hydrotalcite-like compounds [ZnAlLa-HTLcs] wasstudied. ZnAlLa-HTLcs were synthesized by a method of variable pH with the raw materials ofZn(NO_3)_2, Al(NO_3)_3, La(NO_3)_3, and NaOH. The eS&#... The preparation of ZnAlLa-hydrotalcite-like compounds [ZnAlLa-HTLcs] wasstudied. ZnAlLa-HTLcs were synthesized by a method of variable pH with the raw materials ofZn(NO_3)_2, Al(NO_3)_3, La(NO_3)_3, and NaOH. The eS'ccts of some factors (i.e. pH values, the moleratio of Al^(3+) to La^(3+), temperature and the period of hydrothermal treatment) on thepreparation of HTLcs were discussed systematically. XRD, TG-DTA, FT-IR spectroscopy, and ICP wereperformed to characterize ZnAlLa-HTLcs samples, and the thermal stability of HTLcs was alsodiscussed. It was shown that unique ZnAlLa-HTLcs with high crystallinity can be prepared, under theconditions of pH = 5.5-6.5, n(Zn^(2+))/n(Al^(3+) + La^(3+))=2 and the atomic ratio of La^(3+) toAl^(3+) ranging from 0.07 to 2, hydrothermal treatment at 120 ℃ for 5 h. When the calcination ofthe HTLcs is performed at temperatures above 200 ℃, ZnO phase is detected with Al_2O_3 and La_2O_3spreading on its top. The complex metal oxides derived from ZnAlLa-HTLcs at 500 ℃ have highercatalytic activity and selectivity than those from ZnAl-HTLcs for the esterification of acetic acidwith n-butanol under the same reaction conditions. 展开更多
关键词 layered compound double hydroxide anionic clay HYDROTALCITE ZnAlLa PREPARATION CHARACTERIZATION application
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Principle and engineering application of pressure relief gas drainage in low permeability outburst coal seam 被引量:15
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作者 LIU lin CHENG Yuan-ping +2 位作者 WANG Hai-feng WANG Liang MA Xian-qin 《Mining Science and Technology》 EI CAS 2009年第3期342-345,351,共5页
With the increase in mining depth, the danger of coal and gas outbursts increases.In order to drain coal gas effectively and to eliminate the risk of coal and gas outbursts, we used a specific number of penetration bo... With the increase in mining depth, the danger of coal and gas outbursts increases.In order to drain coal gas effectively and to eliminate the risk of coal and gas outbursts, we used a specific number of penetration boreholes for draining of pressure relief gas.Based on the principle of overlying strata movement, deformation and pressure relief, a good effect of gas drainage was obtained.The practice in the Panyi coal mine has shown that, after mining the C11coal seam as the protective layer, the relative expansion deformation value of the protected layer C13 reached 2.63%, The permeability coefficient increased 2880 times, the gas drainage rate of the C13 coal seam increased to more than 60%, the amount of gas was reduced from 13.0 to 5.2 m3/t and the gas pressure declined from 4.4 to 0.4 MPa, which caused the danger the outbursts in the coal seams to be eliminated.The result was that we achieved a safe and highly efficient mining operation of the C13 coal seam. 展开更多
关键词 protective layer mining technology principle drainage of pressure relief gas engineering application
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Interactive transport of multi-view videos for 3DTV applications 被引量:4
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作者 KURUTEPE Engin CIVANLAR M.Reha TEKALP A.Murat 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第5期830-836,共7页
The authors propose a novel method for transporting multi-view videos that aims to keep the bandwidth requirements on both end-users and servers as low as possible. The method is based on application layer multicast, ... The authors propose a novel method for transporting multi-view videos that aims to keep the bandwidth requirements on both end-users and servers as low as possible. The method is based on application layer multicast, where each end point re- ceives only a selected number of views required for rendering video from its current viewpoint at any given time. The set of selected videos changes in real time as the user’s viewpoint changes because of head or eye movements. Techniques for reducing the black-outs during fast viewpoint changes were investigated. The performance of the approach was studied through network experiments. 展开更多
关键词 3DTV MULTI-VIEW video application-layer multicast Join-latency
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Hierarchical multicast with inter-layer random network coding 被引量:1
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作者 司菁菁 Zhuang Bojin Cai Anni 《High Technology Letters》 EI CAS 2011年第1期86-90,共5页
To maximize the aggregate throughput achieved in heterogeneous networks, this paper investigates inter-session network coding for the distribution of layered source data. We define inter-layer hierarchical random line... To maximize the aggregate throughput achieved in heterogeneous networks, this paper investigates inter-session network coding for the distribution of layered source data. We define inter-layer hierarchical random linear network codes (IHRLNC), which not only take the flexibility of intersession network coding for layer mixing but also consider the strict priority inherent in the layered source data. Furthermore, we propose the inter-layer hierarchical multicast (IHM), which performs IHRLNC in the network such that each sink can recover some source layers according to its individu- al capacity. To determine the optimal type of IHRLNC that should be performed on each edge in IHM, we formulate an optimization problem based on 0-1 integer linear programming, and propose a heuristic approach to approximate the optimal solution in polynomial time. Simulation results show that the proposed IHM can achieve throughput gains over the layered muhicast schemes. 展开更多
关键词 network coding inter-session inter-layer hierarchical multicast (IHM) layerED
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Adaptive DirectShow Framework for Layered MPEG-4 Video Multicast
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作者 高玉金 石峰 张艳苏 《Journal of Beijing Institute of Technology》 EI CAS 2003年第S1期114-119,共6页
An extensible framework was proposed to implement the hierarchical and adaptive control and feedback mechanism of layered MPEG-4 video multicast transmission in DirectShow architecture. In our framework, layers of MPE... An extensible framework was proposed to implement the hierarchical and adaptive control and feedback mechanism of layered MPEG-4 video multicast transmission in DirectShow architecture. In our framework, layers of MPEG-4 video and FEC data are wrapped dynamically in RTP packets to pass through the heterogeneous network effectively. An adaptive control center is designed to control the actions of the related components dynamically according to varying resources availability on local host and network. This effective and adaptive framework can be used to instruct the implementation of applications based on layered MPEG-4 video multicast transmission and other designs of multimedia application frameworks. 展开更多
关键词 DIRECTSHOW FEC RTP multicast layered video
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Optimal power allocation for a video layered multicasting relay strategy in cellular system
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作者 王成金 李屹 +1 位作者 张琳 纪红 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2011年第6期63-67,共5页
Within a cell of cellular system,cooperative relay technique can improve the performance of multicast efficiently,but it can cause the stream frequent interruptions because of the mobility of relay terminals.A video l... Within a cell of cellular system,cooperative relay technique can improve the performance of multicast efficiently,but it can cause the stream frequent interruptions because of the mobility of relay terminals.A video layered cooperative relay strategy is proposed to guarantee the continuity of multicast stream and retain high-bandwidth of the cooperative relay channel.Based on the capacity analysis for layered relay channel in the strategy,the optimal power allocation is studied to maximize capacity.After analyzing and optimizing the capacity in abstract models,the study is extended to a non-fading and a Gaussian wireless channel model to satisfy the scenario of cellular system.Giving the relay nodes position or distribution of noise power,the obtained results can determine the optimal power allocation among the transmitter and relay nodes.At last,the simulation results show that the strategy and its optimal power allocation have a significant improvement on the performance. 展开更多
关键词 capacity cellular system layered relay multicast
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A stream layered cooperative relay multicast scheme and capacity analysis in cellular systems
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作者 王成金 Si Pengbo +2 位作者 Li Yi Zhang Lin Ji Hong 《High Technology Letters》 EI CAS 2011年第4期339-343,共5页
It is widely believed that cooperative relay technologies can improve the throughput of multicasting in mobile cellular networks significantly, however, the mobility of the relay terrninals may cause frequent relay li... It is widely believed that cooperative relay technologies can improve the throughput of multicasting in mobile cellular networks significantly, however, the mobility of the relay terrninals may cause frequent relay link outage. This paper proposes a stream layered cooperative relay scheme to deal with this problem. In order to study the characteristics of layered relay channels in the scheme, the capacity region is determined based on a single and a multi relay abstract model with streams layering. Besides, to satisfy the cellular network scenario, the results are extended to a wireless Gaussian channel model. The analysis and simulation results show that the scheme guarantees the continuity of the multicast streams, and maintains the high bandwidth of relay channel, with a slight loss on system capacity. 展开更多
关键词 cellular mobile system channel capacity cooperative relay stream layered multicast
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A Dynamic Adaptive Layered Multicast Congestion Control Mechanism
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作者 REN Liyong LU Xianliang WEI Qingsong ZHOU Xu(School of Computer Science and Engineering,UESTC Chengdu 610054 China) 《Journal of Electronic Science and Technology of China》 2003年第1期37-42,共6页
To solve the problem that most of existing layered multicast protocols cannot adapt todynamic network conditions because their layers are coarsely granulated and static,a new congestioncontrol mechanism for dynamic ad... To solve the problem that most of existing layered multicast protocols cannot adapt todynamic network conditions because their layers are coarsely granulated and static,a new congestioncontrol mechanism for dynamic adaptive layered multicast(DALM) is presented.In this mechanism,anovel feedback aggregating algorithm is put forward,which can dynamically determine the number oflayers and the rate of each layer,and can efficiently improve network bandwidth utilization ratio.Additionally,because all layers is transmitted in only one group,the intricate and time-consuminginternet group management protocol(IGMP) operations,caused by receiver joining a new layer orleaving the topmost subscribed layer,are thoroughly eliminated.And this mechanism also avoids otherproblems resulted from multiple groups.Simulation results show that DALM is adaptive and TCPfriendly. 展开更多
关键词 dynamic layered multicast congestion control TCP friendly aggregate algorithm
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基于特征融合和模板更新的孪生网络跟踪算法
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作者 吴国瑞 王峰 李杰 《电光与控制》 北大核心 2025年第1期41-47,85,共8页
针对现有孪生网络跟踪算法仅使用主干网络最后一层的特征进行相似度匹配,以及缺少有效模板更新策略的问题,提出基于多尺度特征融合和自适应模板更新的孪生网络跟踪算法。首先,结合深度过参数化卷积设计非填充单元,提取更深层的前景特征... 针对现有孪生网络跟踪算法仅使用主干网络最后一层的特征进行相似度匹配,以及缺少有效模板更新策略的问题,提出基于多尺度特征融合和自适应模板更新的孪生网络跟踪算法。首先,结合深度过参数化卷积设计非填充单元,提取更深层的前景特征和语义背景;然后,设计新的全局-局部特征融合模块,充分聚合浅、中层特征的全局和局部信息,捕获丰富的浅层外观特征和中层过渡特征;最后,采用自适应模板更新机制在线更新模板。为验证算法的有效性,在公开数据集上对所提算法进行详尽评估,实验结果显示,所提算法在OTB2015和VOT2018数据集上的精确度分别达到0.878和0.588,GOT10K数据集上平均重叠率达到0.526,优于其他主流算法。 展开更多
关键词 目标跟踪 孪生网络 计算机应用 多层特征融合 模板更新
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分层自治的Multicast地址管理和连接控制 被引量:1
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作者 王箭 张福炎 《软件学报》 EI CSCD 北大核心 1999年第8期891-896,共6页
Multicast动态地址管理和连接控制是多点会话中的重要问题.基于分层自治结构,文章提出了Multicast地址分配管理机制、主从结构连接管理体系和一种简单的多点连接建立算法,简述了它们的工作过程,并通过模拟实验比较了3种地址分配方... Multicast动态地址管理和连接控制是多点会话中的重要问题.基于分层自治结构,文章提出了Multicast地址分配管理机制、主从结构连接管理体系和一种简单的多点连接建立算法,简述了它们的工作过程,并通过模拟实验比较了3种地址分配方式,即集中管理方式、分布方式(由Eleftheri-adis提出)与分层自治方式.分层自治结构与Internet自组织拓扑结构一致,分层自治地址分配机制结合了集中方式和分布方式的优点,具有较高的整体效率,主从结构连接管理体系也具有较高的控制效率,它们都具有较高的鲁棒性、柔韧性和伸缩性. 展开更多
关键词 地址管理 分层自治 multicast地址 INTERNET网
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