|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Traffic Prediction in 3G Mobile Networks Based on Multifractal Exploration显示文摘Traffic prediction plays an integral role in telecommunication network planning and network optimization. In this paper, we investigate the traffic forecasting for data services in 3G mobile networks. Although the Box-Jenkins model has been proven to be appropriate for voice traffic (since the arrival of calls follows a Poisson distribution), it has been demonstrated that the Internet traffic exhibits statistical self-similarity and has to be modeled using the Fractional AutoRegressive Integrated Moving Average (FARIMA) process. However, a few studies have concluded that the FARIMA process may fail in modeling the Internet traffic. To this end, we conducted experiments on the modeling of benchmark Internet traffic and found that the FARIMA process fails because of the significant multifractal characteristic inherent in the traffic series. Thereafter, we investigate the traffic series of data services in a 3G mobile network from a province in China. Rich multifractal spectra are found in this series. Based on this observation, an integrated method combining the AutoRegressive Moving Average (ARMA) and FARIMA processes is applied. The obtained experimental results verify the effectiveness of the integrated prediction method. | Yanhua Yu Meina Song Yu Fu Junde Song | 2013 | Tsinghua Science and Technology2013，18，4： | 6 |
| 2 | Comparative analysis of the cardiac structure and transcriptome of scallop and snail,perspectives on heart chamber evolution显示文摘The evolution of a two-chambered heart,with an atrium and a ventricle,has improved heart function in both deuterostomes(vertebrates)and some protostomes(invertebrates).Although studies have examined the unique structure and function of these two chambers,molecular comparisons are few and limited to vertebrates.Here,we focus on the two-chambered protostome heart of the mollusks,offering data that may provide a better understanding of heart evolution.Specifically,we asked if the atrium and ventricle differ at the molecular level in the mollusk heart.To do so,we examined two very different species,the giant African land snail(Lissachatina fulica)and the relatively small,aquatic yesso scallop(Mizuhopecten yessoensis),with the assumption that if they exhibited commonality these similarities would likely reflect those across the phylum.We found that,although the hearts of these two species differed histologically,their cardiac gene function enrichments were similar,as revealed by transcriptomic analysis.Furthermore,the atrium and ventricle in each species had distinct gene function clusters,suggesting an evolutionary differentiation of cardiac chambers in mollusks.Finally,to explore the relationship between vertebrate and invertebrate two-chambered hearts,we compared our transcriptomic data with published data from the zebrafish,a well-studied vertebrate model with a two-chambered heart.Our analysis indicated a functional similarity of ventricular genes between the mollusks and the zebrafish,suggesting that the ventricle was differentiated to achieve the same functions in invertebrates and vertebrates.As the first such study on protostomes,our findings offered initial insights into how the two-chambered heart arose,including a possible understanding of its occurrence in both protostomes and deuterostomes. | Meina Lu Rabia Hayat Xuejiao Zhang Yaqi Jiao Jianyun Huang Yifan Huangfu Mingcan Jiang Jieyi Fu Qingqiu Jiang Yaojia Gu Shi Wang Alexander A.Akerberg Ying Su Long Zhao | 2023 | Marine Life Science & Technology2023，5，4： | 1 |
| 3 | The right inferior frontal gyrus as pivotal node and effective regulator of the basal ganglia-thalamocortical response inhibition circuit显示文摘Background:The involvement of specific basal ganglia-thalamocortical circuits in response inhibition has been extensively mapped in animal models.However,the pivotal nodes and directed causal regulation within this inhibitory circuit in humans remains con-troversial.Objective:The main aim of the present study was to determine the causal information flow and critical nodes in the basal ganglia-thalamocortical inhibitory circuits and also to examine whether these are modulated by biological factors(i.e.sex)and behavioral performance.Methods:Here,we capitalize on the recent progress in robust and biologically plausible directed causal modeling(DCM-PEB)and a large response inhibition dataset(n=250)acquired with concomitant functional magnetic resonance imaging to determine key nodes,their causal regulation and modulation via biological variables(sex)and inhibitory performance in the inhibitory circuit encompassing the right inferior frontal gyrus(rIFG),caudate nucleus(rCau),globus pallidum(rGP),and thalamus(rThal).Results:The entire neural circuit exhibited high intrinsic connectivity and response inhibition critically increased causal projections from the rIFG to both rCau and rThal.Direct comparison further demonstrated that response inhibition induced an increasing rIFG inflow and increased the causal regulation of this region over the rCau and rThal.In addition,sex and performance influenced the functional architecture of the regulatory circuits such that women displayed increased rThal self-inhibition and decreased rThal to GP modulation,while better inhibitory performance was associated with stronger rThal to rIFG communication.Furthermore,control analyses did not reveal a similar key communication in a left lateralized model.Conclusions:Together,these findings indicate a pivotal role of the rIFG as input and causal regulator of subcortical response inhibition nodes. | Qian Zhuang Lei Qiao Lei Xu Shuxia Yao Shuaiyu Chen Xiaoxiao Zheng Jialin Li Meina Fu Keshuang Li Deniz Vatansever Stefania Ferraro Keith M.Kendrick Benjamin Becker | 2023 | Psychoradiology2023，3，1： | 0 |
| 4 | Nitrogen deposition suppresses fungal biomass and oxidase activity in faeces of the millipede Spirobolus formosae in a temperate forest显示文摘Atmospheric nitrogen(N)deposition has increased dramatically since the industrial revolution due to human activities.In terrestrial ecosystems,excess nitrogen inputs can greatly affect soil chemical properties,plant growth,and activities of soil microbes and fauna.Millipedes can fragment and consume large quantities of litter,and they regulate nutrient cycling and affect soil fertility through excretion of faeces.Many soil fauna graze on the faeces of millipedes as a part of the soil food web.The decomposition and stabilization of these millipede faeces are especially important in soil carbon dynamics and nutrient cycling,and these processes rely heavily upon microbial activity.However,very few studies have investigated how microbial community structure and oxidase activity of millipede faeces respond to climate change,especially N deposition.Therefore,we designed a microcosm study to investigate this question,which included two treatments,N addition treatment and control(without N addition).We found that:(i)microbial community structure in millipede faeces was altered and the biomass of fungi and actinomycetes in faecal pellets were significantly reduced after N addition,but bacteria still dominated in millipede faeces after N addition,(ii)oxidase activity was suppressed in response to N addition,and(iii)microbial community structure and oxidase activities were significantly correlated to organic carbon and dissolved total nitrogen of faeces.All these changes suggest that millipede excretion activities under nitrogen deposition contribute to carbon stabilization and reduction in greenhouse gas emission owing to the significant role of fungi and associated oxidase in carbon mineralization.It is noteworthy to pay more attention to the function of saprotrophic invertebrates in future N deposition studies. | Mengru Wang Shenglei Fu Hongzhi Zhang Meina Wang Haixiang Xu Leilei Shi | 2019 | Soil Ecology Letters2019，1，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员