Aiming at satellite optical network and optical switching, we bring forward an assembly algorithm for satellite onboard optical switching. It can regulate the assembly threshold on the basis of traffic flow of edge no...
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ISBN:
(纸本)9781467329644;9781467329637
Aiming at satellite optical network and optical switching, we bring forward an assembly algorithm for satellite onboard optical switching. It can regulate the assembly threshold on the basis of traffic flow of edge node, then achieve intelligent assembly. The simulation result shows that the algorithm improves the packet loss ratio and delay, and its complexity is not high, so it is suitable for satellite optical network.
In order to solve the problem of on-board optical burst switching assembly algorithm cannot realize completely QoS guarantee, an on-board optical burst switching weight-weighted round robin assembly algorithm based on...
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ISBN:
(纸本)9781509034918
In order to solve the problem of on-board optical burst switching assembly algorithm cannot realize completely QoS guarantee, an on-board optical burst switching weight-weighted round robin assembly algorithm based on the QoS guarantee(QWRRA) is proposed in this paper. In this assembly algorithm, IP packet will be inserted in different queue according to the different destination and QoS level when arrive at edge node LEO, the assemble scheduler removes the IP packet from the queue according to the weight-weighted round robin mechanism and assembles the IP packet. When the assemble scheduler generates a burst data packet, it will detect the length of each queue, and change the weights of the queue. Simulation studies the transmission delay and throughput performance of the algorithm, then compared with the assembly algorithm based on mixed threshold and round-robin scheme(FZTFR) and assembly algorithm based on maximum length and maximum time(MSMAP). The results show that the proposed algorithm improves the transmission quality of high priority IP packet and guarantees the transmission of lower level IP packet at the same time.
To prevent harmful information through ISP's firewall, major technical measures are filtering technology and classification access. ACL assembly technology can effectively achieve the effect of fine filtering and ...
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ISBN:
(纸本)9781538633229
To prevent harmful information through ISP's firewall, major technical measures are filtering technology and classification access. ACL assembly technology can effectively achieve the effect of fine filtering and restricted access, so the network equipment with the application of ACL assembly technology is a new research direction. This paper briefly introduces the basic principles and development of ACL assembly, and focuses on the matching performance of ACL assembly. An improved NP+ TCAM-based ternary bitmap matching algorithm is proposed to effectively minimize the number of times of matching when assembling ACLs. The test data suggest that this algorithm effectively improves the real-timeliness of correlation matching.
In order to improve the performance and quality of service (QoS) guarantee of space-based optical burst switching networks, this paper proposes a burst assembly algorithm appropriate for on-board optical switching, wh...
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ISBN:
(纸本)9781728121840
In order to improve the performance and quality of service (QoS) guarantee of space-based optical burst switching networks, this paper proposes a burst assembly algorithm appropriate for on-board optical switching, which adaptively adjusts the time threshold according to the QoS priority to reduce the assembly time delay of the high-QoS services without extra overhead. The simulation results indicate that compared with the traditional assembly algorithm based on hybrid threshold, the assembly time delay of high-QoS services can be reduced by 2.81%-44.68%.
Presently, optical burst switching (OBS) technology is under study as a promising solution for the backbone of the optical Internet in the near future because OBS eliminates the optical buffer problem at the switching...
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Presently, optical burst switching (OBS) technology is under study as a promising solution for the backbone of the optical Internet in the near future because OBS eliminates the optical buffer problem at the switching node with the help of no optical/electro/optical conversion and guarantees class of service without any buffering. To implement the OBS network, there are a lot of challenging issues to be solved. The edge router, burst offset time management, and burst assembly mechanism are critical issues. In addition, the core router needs data burst and control header packet scheduling, a protection and restoration mechanism, and a contention resolution scheme. In this paper, we focus on the burst assembly mechanism. We present a novel data burst generation algorithm that uses hysteresis characteristics in the queueing model for the ingress edge node in optical burst switching networks. Simulation with Poisson and self-similar traffic models shows that this algorithm adaptively changes the data burst size according to the offered load and offers high average data burst utilization with a lower timer operation. It also reduces the possibility of a continuous blocking problem in the bandwidth reservation request, limits the maximum queueing delay, and minimizes the required burst size by lifting up data burst utilization for bursty input IP traffic.
assembly algorithm plays a vital role in the functionality of OBS networks. In this article, the fixed and dynamic assembly period algorithms are analyzed and also, we proposed Enhanced Fast Recovery dynamic assembly ...
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Optical packet assembly algorithms have great effects on the performances of optical packet switching network. When the granularity of an optical packet is almost the same as the switching time of an optical switch, o...
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ISBN:
(纸本)9780819469472
Optical packet assembly algorithms have great effects on the performances of optical packet switching network. When the granularity of an optical packet is almost the same as the switching time of an optical switch, optical packet assembly algorithms have to be modified. For this purpose, in this paper, two improved assembly algorithms, i.e., Threshold-Based-ST and Timer-Based-ST are proposed. The performances of the optical packet switch are evaluated by simulation experiments.
Background: Physical mapping of DNA with restriction enzymes allows for the characterization and assembly of much longer molecules than is feasible with sequencing. However, assemblies of physical map data are sensiti...
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Background: Physical mapping of DNA with restriction enzymes allows for the characterization and assembly of much longer molecules than is feasible with sequencing. However, assemblies of physical map data are sensitive to input parameters, which describe noise inherent in the data collection process. One possible way to determine the parameter values that best describe a dataset is by trial and error. Results: Here we present OMWare, a tool that efficiently generated 405 de novo map assemblies of a single datasets collected from the cotton species Gossypium raimondii. The assemblies were generated using various input parameter values, and were completed more efficiently by re-using compatible intermediate results. These assemblies were assayed for contiguity, internal consistency, and accuracy. Conclusions: Resulting assemblies had variable qualities. Although highly accurate assemblies were found, contiguity and internal consistency metrics were poor predictors of accuracy.
Over the past 20 years,tremendous advances in sequencing technologies and computational algorithms have spurred plant genomic research into a thriving era with hundreds of genomes decoded already,ranging from those of...
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Over the past 20 years,tremendous advances in sequencing technologies and computational algorithms have spurred plant genomic research into a thriving era with hundreds of genomes decoded already,ranging from those of nonvascular plants to those of flowering ***,complex plant genome assembly is still challenging and remains difficult to fully resolve with conventional sequencing and assembly methods due to high heterozygosity,highly repetitive sequences,or high ploidy characteristics of complex ***,we summarize the challenges of and advances in complex plant genome assembly,including feasible experimental strategies,upgrades to sequencing technology,existing assembly methods,and different phasing ***,we list actual cases of complex genome projects for readers to refer to and draw upon to solve future problems related to complex ***,we expect that the accurate,gapless,telomere-totelomere,and fully phased assembly of complex plant genomes could soon become routine.
A burst assembly scheme at the edge routers in optical burst switched networks (OBSNs) is presented for setting up more universal, realistic, and high-powered networks. For the first time, the concept of unit input bi...
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A burst assembly scheme at the edge routers in optical burst switched networks (OBSNs) is presented for setting up more universal, realistic, and high-powered networks. For the first time, the concept of unit input bit rate is introduced to improve universality. In addition, various factors limiting burst length are discussed, while considering service requirement and hardware architectures. Then, a novel burst assembly algorithm with a buffer safety space is proposed. Based on the above, the assembly process in optical burst switching at edge routers is simulated, and its influence on burst creation, burst length distribution, packet loss ratio, total output data, and valid data ratio are discussed. The results show that the scheme can provide more efficient QoS guarantee in optical burst switched networks, even for 32 random packet sources at an edge router, the packet loss ratio is to 5 x 10(-5), and the valid data ratio reaches 99.7%.
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