SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Kaj Ingemar) "

Sökning: WFRF:(Kaj Ingemar)

  • Resultat 1-50 av 111
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  •  
2.
  • Bartoszek, Krzysztof, et al. (författare)
  • Predicting pathogenicity behavior in Escherichia coli population through a state dependent model and TRS profiling
  • 2018
  • Ingår i: PloS Computational Biology. - : PUBLIC LIBRARY SCIENCE. - 1553-734X .- 1553-7358. ; 14:1
  • Tidskriftsartikel (refereegranskat)abstract
    • The Binary State Speciation and Extinction (BiSSE) model is a branching process based model that allows the diversification rates to be controlled by a binary trait. We develop a general approach, based on the BiSSE model, for predicting pathogenicity in bacterial populations from microsatellites profiling data. A comprehensive approach for predicting pathogenicity in E. coli populations is proposed using the state-dependent branching process model combined with microsatellites TRS-PCR profiling. Additionally, we have evaluated the possibility of using the BiSSE model for estimating parameters from genetic data. We analyzed a real dataset (from 251 E. coli strains) and confirmed previous biological observations demonstrating a prevalence of some virulence traits in specific bacterial sub-groups. The method may be used to predict pathogenicity of other bacterial taxa.
  •  
3.
  • Bartoszek, Krzysztof, 1984-, et al. (författare)
  • Using the Ornstein-Uhlenbeck process to model the evolution of interacting populations
  • 2017
  • Ingår i: Journal of Theoretical Biology. - : Elsevier BV. - 0022-5193 .- 1095-8541. ; 429, s. 35-45
  • Tidskriftsartikel (refereegranskat)abstract
    • The Ornstein-Uhlenbeck (OU) process plays a major role in the analysis of the evolution of phenotypic traits along phylogenies. The standard OU process includes random perturbations and stabilizing selection and assumes that species evolve independently. However, evolving species may interact through various ecological process and also exchange genes especially in plants. This is particularly true if we want to study phenotypic evolution among diverging populations within species. In this work we present a straightforward statistical approach with analytical solutions that allows for the inclusion of adaptation and migration in a common phylogenetic framework, which can also be useful for studying local adaptation among populations within the same species. We furthermore present a detailed simulation study that clearly indicates the adverse effects of ignoring migration. Similarity between species due to migration could be misinterpreted as very strong convergent evolution without proper correction for these additional dependencies. Finally, we show that our model can be interpreted in terms of ecological interactions between species, providing a general framework for the evolution of traits between "interacting" species or populations.
  •  
4.
  •  
5.
  • Biermé, Hermine, et al. (författare)
  • Self-similar random fields and rescaled random balls models
  • 2007
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • We study generalized random fields which arise as rescaling limits ofspatial configurations of uniformly scattered random balls as the meanradius of the balls tends to $0$ or infinity. Assuming that the radiusdistribution has a power law behavior, we prove that the centered andrenormalized random balls field admits a limit with strong spatialdependence. In particular, our approach provides a unified frameworkto obtain all self-similar, translation and rotationinvariant Gaussian fields.In addition to investigating stationarity and self-similarityproperties, we give $L2$-representations of the asymptotic generalizedrandom fields viewed as continuous random linear functionals.
  •  
6.
  • Biermé, Hermine, et al. (författare)
  • Self-similar Random Fields and Rescaled Random Balls Models
  • 2010
  • Ingår i: Journal of theoretical probability. - : Springer Science and Business Media LLC. - 0894-9840 .- 1572-9230. ; 23:4, s. 1110-1141
  • Tidskriftsartikel (refereegranskat)abstract
    • We study generalized random fields which arise as rescaling limits of spatial configurations of uniformly scattered random balls as the mean radius of the balls tends to 0 or infinity. Assuming that the radius distribution has a power-law behavior, we prove that the centered and renormalized random balls field admits a limit with self-similarity properties. Our main result states that all self-similar, translation-and rotation-invariant Gaussian fields can be obtained through a unified zooming procedure starting from a random balls model. This approach has to be understood as a microscopic description of macroscopic properties. Under specific assumptions, we also get a Poisson-type asymptotic field. In addition to investigating stationarity and self-similarity properties, we give L-2-representations of the asymptotic generalized random fields viewed as continuous random linear functionals.
  •  
7.
  •  
8.
  • Bountouvi, Evangelia, et al. (författare)
  • Longitudinal Data in Patients with Niemann-Pick Type C Disease Under Combined High Intrathecal and Low Intravenous Dose of 2-hydroxylpropyl-β-cyclodextrin.
  • 2021
  • Ingår i: Innovations in clinical neuroscience. - 2158-8333. ; 18:1-3, s. 11-16
  • Tidskriftsartikel (refereegranskat)abstract
    • Niemann-Pick Type C disease (NPC) is a rare, incurable, autosomal-recessive, lysosomal storage disorder with protean and progressive neurovisceral manifestations characterized by accumulation of intracellular unesterified cholesterol. The investigational use of 2-hydroxypropyl-beta-cyclodextrin (HP-β-CD) in the treatment of NPC has shown promising results in improving life expectancy and reducing neurological damage in this patient population. This case report describes two children with the neurological form of NPC: a 5-year-old male patient in advanced stage of the disease and an 11-year-old female patient in moderately advanced stage. Despite treatment with the enzyme inhibitor, miglustat, both patients continued to exhibit severe neurodegeneration. High intrathecal (900mg) and low intravenous (350-500mg/kg) doses of HP-β-CD (Trappsol®Cyclo™) were administrated twice monthly to the patients in addition to miglustat therapy. The patients were monitored clinically as well as by imaging, laboratory, and biomarker (e.g., total tau protein [T-tau]; phosphorylated tau [P-tau]; neurofilament light [NFL], oxysterols) studies over a period of 16 to 22 months. The combination therapy of miglustat and HP-β-CD resulted in disease stabilization in both patients. The combination therapy demonstrated a good safety profile, and no adverse effects on hearing were observed. Additionally, CSF biomarkers appeared useful in monitoring neuronal damage. Large, randomized studies are needed to confirm these findings.
  •  
9.
  • Bremander, Ann B, et al. (författare)
  • Revision in previously satisfied knee arthroplasty patients is the result of their call on the physician, not on pre-planned follow-up : a retrospective study of 181 patients who underwent revision within 2 years
  • 2005
  • Ingår i: Acta Orthopaedica. - : Medical Journals Sweden AB. - 1745-3674 .- 1745-3682. ; 76:6, s. 785-90
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: Degree of satisfaction with a knee arthroplasty is said to be correlated to reduced pain and better function. During a validation of the Swedish Knee Arthroplasty Register in 1997, previously operated patients were asked how satisfied they were with their knee. A subgroup of "satisfied" patients was identified who underwent revision within 2 years of having expressed satisfaction. Our aim was to study the revision diagnosis, to determine whether the problem leading to revision had been discovered as a result of routine follow-up, and also to find out when the symptoms leading to revision had started.METHODS: We retrospectively studied the medical records of 181 patients (181 knees), with a median age of 74 (31-88) years. 68% were women and the median time between primary operation and revision was 8 (3-21) years.RESULTS: Aseptic loosening (74/181) was the most common diagnosis. 2 cases were revised as a result of routine follow-up. 44% of the medical records included reports of pain in the replaced knee prior to answering the satisfaction questionnaire.INTERPRETATION: Few patients were admitted to knee revision surgery due to medical findings discovered during routine follow-up. The term "satisfaction" must be interpreted with care, as it seems to have a more complex meaning for the patients than absence of knee pain.
  •  
10.
  • Dombry, Clement, et al. (författare)
  • Moment measures of heavy-tailed renewal point processes : asymptotics and applications
  • 2013
  • Ingår i: ESAIM. P&S. - : EDP Sciences. - 1292-8100 .- 1262-3318. ; 17, s. 567-591
  • Tidskriftsartikel (refereegranskat)abstract
    • We study higher-order moment measures of heavy-tailed renewal models, including a renewal point process with heavy-tailed inter-renewal distribution and its continuous analog, the occupation measure of a heavy-tailed Lévy subordinator. Our results reveal that the asymptotic structure of such moment measures are given by explicit power-law density functions. The same power-law densities appear naturally as cumulant measures of certain Poisson and Gaussian stochastic integrals. This correspondence provides new and extended results regarding the asymptotic fluctuations of heavy-tailed sources under aggregation, and clarifies existing links between renewal models and fractional random processes.
  •  
11.
  • Dombry, Clément, et al. (författare)
  • The on-off network traffic model under intermediate scaling
  • 2011
  • Ingår i: Queueing systems. - : Springer Science and Business Media LLC. - 0257-0130 .- 1572-9443. ; 69:1, s. 29-44
  • Tidskriftsartikel (refereegranskat)abstract
    • The result provided in this paper helps complete a unified picture of the scaling behavior in heavy-tailed stochastic models for transmission of packet traffic on high-speed communication links. Popular models include infinite source Poisson models, models based on aggregated renewal sequences, and models built from aggregated on---off sources. The versions of these models with finite variance transmission rate share the following pattern: if the sources connect at a fast rate over time the cumulative statistical fluctuations are fractional Brownian motion, if the connection rate is slow the traffic fluctuations are described by a stable Lévy motion, while the limiting fluctuations for the intermediate scaling regime are given by fractional Poisson motion. In this paper, we prove an invariance principle for the normalized cumulative workload of a network with m on---off sources and time rescaled by a factor a. When both the number of sources m and the time scale a tend to infinity with a relative growth given by the so-called 'intermediate connection rate' condition, the limit process is the fractional Poisson motion. The proof is based on a coupling between the on---off model and the renewal type model.
  •  
12.
  • Flisberg, Anders, 1958, et al. (författare)
  • Does indomethacin for closure of patent ductus arteriosus affect cerebral function?
  • 2010
  • Ingår i: Acta Paediatrica. - : Wiley. - 0803-5253 .- 1651-2227. ; 99:10, s. 1493-1497
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective: To study whether indomethacin used in conventional dose for closure of patent ductus arteriosus affects cerebral function measured by Electroencephalograms (EEG) evaluated by quantitative measures. Study design: Seven premature neonates with haemodynamically significant persistent ductus arteriosus were recruited. EEG were recorded before, during and after an intravenous infusion of 0.2 mg/kg indomethacin over 10 min. The EEG was analysed by two methods with different degrees of complexity for the amount of low-activity periods (LAP, "suppressions") as an indicator of affection of cerebral function. Results: Neither of the two methods identified any change in the amount of LAPs in the EEG as compared to before the indomethacin infusion. Conclusion: Indomethacin in conventional dose for closure of patent ductus arteriosus does not affect cerebral function as evaluated by quantitative EEG.
  •  
13.
  • Flisberg, Anders, 1958, et al. (författare)
  • EEG and spectral edge frequency : analysis in posthypoxic newborn piglets
  • 2010
  • Ingår i: Neuro - endocrinology letters. - : Brain Research Promotion. - 0172-780X. ; 31:2, s. 181-186
  • Tidskriftsartikel (refereegranskat)abstract
    • OBJECTIVE: To evaluate the frequency content of the electroencephalogram (EEG) during recovery after a severe hypoxic insult in newborn piglets. METHODS: EEG was continuously monitored in nine newborn piglets exposed to a severe hypoxic period. Power spectra in five frequency bands were calculated using Fourier transformation. Spectral edge frequency 90 (SEF90) was defined as the frequency below which 90% of the power in the EEG was located. The piglets were divided into two groups; Group 1 represented piglets with some EEG recovery and Group 2 represented piglets without any EEG recovery. RESULTS: The recovery of the EEG in Group 1 had the same time course in all frequency bands. SEF90 indicates recovery earlier than the value of total power. But SEF90 also signals activity in the EEGs that were almost completely suppressed. When SEF90 was calculated during periods of periodic EEG activity during the very early phase of recovery, the values fell within the same range as during the control period. CONCLUSION: Spectral analysis of continuous EEG in newborn piglets exposed to very severe hypoxia showed that no specific frequency band of the EEG preceded the other ones during recovery. The results of the SEF90 measure, demonstrates the need for critical analysis of the raw EEG before any reliable estimation of cerebral function can be made.
  •  
14.
  • Gaigalas, Raimundas, 1975- (författare)
  • A Non-Gaussian Limit Process with Long-Range Dependence
  • 2004
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis, consisting of three papers and a summary, studies topics in the theory of stochastic processes related to long-range dependence. Much recent interest in such probabilistic models has its origin in measurements of Internet traffic data, where typical characteristics of long memory have been observed. As a macroscopic feature, long-range dependence can be mathematically studied using certain scaling limit theorems. Using such limit results, two different scaling regimes for Internet traffic models have been identified earlier. In one of these regimes traffic at large scales can be approximated by long-range dependent Gaussian or stable processes, while in the other regime the rescaled traffic fluctuates according to stable ``memoryless'' processes with independent increments. In Paper I a similar limit result is proved for a third scaling scheme, emerging as an intermediate case of the other two. The limit process here turns out to be a non-Gaussian and non-stable process with long-range dependence.In Paper II we derive a representation for the latter limit process as a stochastic integral of a deterministic function with respect to a certain compensated Poisson random measure. This representation enables us to study some further properties of the process. In particular, we prove that the process at small scales behaves like a Gaussian process with long-range dependence, while at large scales it is close to a stable process with independent increments. Hence, the process can be regarded as a link between these two processes of completely different nature.In Paper III we construct a class of processes locally behaving as Gaussian and globally as stable processes and including the limit process obtained in Paper I. These processes can be chosen to be long-range dependent and are potentially suitable as models in applications with distinct local and global behaviour. They are defined using stochastic integrals with respect to the same compensated Poisson random measure as used in Paper II.
  •  
15.
  •  
16.
  •  
17.
  •  
18.
  •  
19.
  • Görgens, Maik, 1984- (författare)
  • Gaussian Bridges : Modeling and Inference
  • 2014
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis consists of a summary and five papers, dealing with the modeling of Gaussian bridges and membranes and inference for the α-Brownian bridge.In Paper I we study continuous Gaussian processes conditioned that certain functionals of their sample paths vanish. We deduce anticipative and non-anticipative representations for them. Generalizations to Gaussian random variables with values in separable Banach spaces are discussed. In Paper II we present a unified approach to the construction of generalized Gaussian random fields. Then we show how to extract different Gaussian processes, such as fractional Brownian motion, Gaussian bridges and their generalizations, and Gaussian membranes from them.In Paper III we study a simple decision problem on the scaling parameter in α-Brownian bridges. We generalize the Karhunen-Loève theorem and obtain the distribution of the involved likelihood ratio based on Karhunen-Loève expansions and Smirnov's formula. The presented approach is applied to a simple decision problem for Ornstein-Uhlenbeck processes as well. In Paper IV we calculate the bias of the maximum likelihood estimator for the scaling parameter and propose a bias-corrected estimator. We compare it with the maximum likelihood estimator and two alternative Bayesian estimators in a simulation study. In Paper V we solve an optimal stopping problem for the α-Brownian bridge. In particular, the limiting behavior as α tends to zero is discussed.
  •  
20.
  • Görgens, Maik, 1984-, et al. (författare)
  • Gaussian processes, bridges and membranes extracted from selfsimilar random fields
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • We consider the class of selfsimilar Gaussian generalized random fields introduced by Dobrushin in 1979. These fields are indexed by Schwartz functions on Rd and parametrized by a self-similarity index and the degree of stationarity of their increments. We show that such Gaussian fields arise in explicit form by letting Gaussian white noise, or Gaussian random balls white noise, drive a shift and scale shot-noise mechanism on Rd, covering both isotropic and anisotropic situations. In some cases these fields allow indexing with a wider class of signed measures, and by using families of signed measures parametrized by the points in euclidean space we are able to extract pointwise defined Gaussian processes, such as fractional Brownian motion on Rd. Developing this method further, we construct Gaussian bridges and Gaussian membranes on a finite domain, which vanish on the boundary of the domain.
  •  
21.
  •  
22.
  • Hart, Michael W., et al. (författare)
  • Positive selection on human gamete-recognition genes
  • 2018
  • Ingår i: PeerJ. - : PeerJ. - 2167-8359. ; 6
  • Tidskriftsartikel (refereegranskat)abstract
    • Coevolution of genes that encode interacting proteins expressed on the surfaces of sperm and eggs can lead to variation in reproductive compatibility between mates and reproductive isolation between members of different species. Previous studies in mice and other mammals have focused in particular on evidence for positive or diversifying selection that shapes the evolution of genes that encode sperm-binding proteins expressed in the egg coat or zona pellucida (ZP). By fitting phylogenetic models of codon evolution to data from the 1000 Genomes Project, we identified candidate sites evolving under diversifying selection in the human genes ZP3 and ZP2. We also identified one candidate site under positive selection in C4BPA, which encodes a repetitive protein similar to the mouse protein ZP3R that is expressed in the sperm head and binds to the ZP at fertilization. Results from several additional analyses that applied population genetic models to the same data were consistent with the hypothesis of selection on those candidate sites leading to coevolution of sperm- and egg-expressed genes. By contrast, we found no candidate sites under selection in a fourth gene (ZP1) that encodes an egg coat structural protein not directly involved in sperm binding. Finally, we found that two of the candidate sites (in C4BPA and ZP2) were correlated with variation in family size and birth rate among Hutterite couples, and those two candidate sites were also in linkage disequilibrium in the same Hutterite study population. All of these lines of evidence are consistent with predictions from a previously proposed hypothesis of balancing selection on epistatic interactions between C4BPA and ZP3 at fertilization that lead to the evolution of co-adapted allele pairs. Such patterns also suggest specific molecular traits that may be associated with both natural reproductive variation and clinical infertility.
  •  
23.
  • Hart, M. W., et al. (författare)
  • Selection on coevolving human gamete recognition genes
  • 2016
  • Ingår i: Integrative and Comparative Biology. - Simon Fraser Univ, Burnaby, BC V5A 1S6, Canada. Arizona State Univ, Tempe, AZ 85287 USA. Univ Chicago, Chicago, IL 60637 USA. Uppsala Univ, Uppsala, Sweden.. - 1540-7063 .- 1557-7023. ; 56, s. E84-E84
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
  •  
24.
  •  
25.
  • Kaj, Ingemar, 1957-, et al. (författare)
  • Analysis of diversity-dependent species evolution using concepts in population genetics
  • 2021
  • Ingår i: Journal of Mathematical Biology. - : Springer Nature. - 0303-6812 .- 1432-1416. ; 82:4
  • Tidskriftsartikel (refereegranskat)abstract
    • In this work, we consider a two-type species model with trait-dependent speciation, extinction and transition rates under an evolutionary time scale. The scaling approach and the diffusion approximation techniques which are widely used in mathematical population genetics provide modeling tools and conceptual background to assist in the study of species dynamics, and help exploring the analogy between trait-dependent species diversification and the evolution of allele frequencies in the population genetics setting. The analytical framework specified is then applied to models incorporating diversity-dependence, in order to infer effective results from processes in which the net diversification of species depends on the total number of species. In particular, the long term fate of a rare trait may be analyzed under a partly symmetric scenario, using a time-change transform technique.
  •  
26.
  • Kaj, Ingemar, et al. (författare)
  • Analytical and stochastic modeling of battery cell dynamics
  • 2012
  • Ingår i: Analytical and Stochastic Modeling Techniques and Applications. - Berlin Heidelberg : Springer Berlin/Heidelberg. - 9783642307812 - 9783642307829 ; , s. 240-254
  • Konferensbidrag (refereegranskat)abstract
    • In this work we present and discuss a modelling framework for the basic discharge process which occurs in simple electrochemical battery cells. The main purpose is to provide a setting for analyzing delivered capacity, battery life expectancy and other measures of performance. This includes a number of deterministic and stochastic variations of kinetic battery models. The primary tool is a novel phase plane analysis of the balance of nominal and theoretical capacity. In particular, we study spatial versions of such models which lead to a linear diffusion equation with Robin type boundary conditions under scaling. Explicit solutions are obtained by considering reflected Brownian motion.
  •  
27.
  •  
28.
  •  
29.
  • Kaj, Ingemar, 1957-, et al. (författare)
  • Convergence to fractional Brownian motion and to the Telecom process : the integral representation approach
  • 2008
  • Ingår i: In and Out of Equilibrium 2. - Basel : Birkhäuser Verlag. - 9783764387853 ; , s. 383-427
  • Bokkapitel (refereegranskat)abstract
    • It has become common practice to use heavy-tailed distributions in order to describe the variations in time and space of network traffic workloads. The asymptotic behavior of these workloads is complex; different limit processes emerge depending on the specifies of the work arrival structure and the nature of the asymptotic scaling. We focus on two variants of the infinite source Poisson model and provide a coherent and unified presentation of the scaling theory by using integral representations. This allows us to understand physically why the various limit processes arise.
  •  
30.
  •  
31.
  •  
32.
  •  
33.
  • Kaj, Ingemar, et al. (författare)
  • Modeling battery cells under discharge using kinetic and stochastic battery models
  • 2016
  • Ingår i: Applied Mathematical Modelling. - : Elsevier BV. - 0307-904X .- 1872-8480. ; 40:17-18, s. 7901-7915
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper we review several approaches to mathematical modeling of simple batterycells and develop these ideas further with emphasis on charge recovery and the responsebehavior of batteries to given external load. We focus on models which use few param-eters and basic battery data, rather than detailed reaction and material characteristicsof a specific battery cell chemistry, starting with the coupled ODE linear dynamics ofthe kinetic battery model. We show that a related system of PDE with Robin typeboundary conditions arises in the limiting regime of a spatial kinetic battery model,and provide a new probabilistic representation of the solution in terms of Brownianmotion with drift reflected at the boundaries on both sides of a finite interval. Tocompare linear and nonlinear dynamics in kinetic and stochastic battery models westudy Markov chains with states representing available and remaining capacities of thebattery. A natural scaling limit leads to a class of nonlinear ODE, which can be solvedexplicitly and compared with the capacities obtained for the linear models. To indicatethe potential use of the modeling we discuss briefly comparison of discharge profilesand effects on battery performance.
  •  
34.
  • Kaj, Ingemar, et al. (författare)
  • Modelling the arrival process for packet audio
  • 2003
  • Ingår i: 2nd international workshop on QoS in Multiservice IP Networks (QoS-IP 2003), Milano, Feb 2003. Springer Lecture Notes in Computer Science. ; 2601, s. 35-49
  • Tidskriftsartikel (refereegranskat)
  •  
35.
  •  
36.
  •  
37.
  •  
38.
  •  
39.
  •  
40.
  • Kaj, Ingemar, 1957- (författare)
  • Probabilistic analysis of hierarchical cluster protocols for wireless sensor networks
  • 2009
  • Ingår i: Network Control and Optimization. - Berlin Heidelberg : Springer Verlag. - 9783642104053 ; , s. 137-151
  • Konferensbidrag (refereegranskat)abstract
    • Wireless sensor networks are designed to extract data from the deployment environment and combine sensing, data processing and wireless communication to provide useful information for the network users. Hundreds or thousands of small embedded units, which operate under low-energy supply and with limited access to central network control, rely on interconnecting protocols to coordinate data aggregation and transmission. Energy efficiency is crucial and it has been proposed that cluster based and distributed architectures such as LEACH are particularly suitable. We analyse the random cluster hierarchy in this protocol and provide a solution for low-energy and limited-loss optimization. Moreover, we extend these results to a multi-level version of LEACH, where clusters of nodes again self-organize to form clusters of clusters, and so on.
  •  
41.
  •  
42.
  •  
43.
  • Kaj, Ingemar, et al. (författare)
  • Scaling limits for random fields with long-range dependence
  • 2007
  • Ingår i: Annals of Probability. - : Institute of Mathematical Statistics. - 0091-1798 .- 2168-894X. ; 35:2, s. 528-550
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper studies the limits of a spatial random field generated by uniformly scattered random sets, as the density λ of the sets grows to infinity and the mean volume ρ of the sets tends to zero. Assuming that the volume distribution has a regularly varying tail with infinite variance, we show that the centered and renormalized random field can have three different limits, depending on the relative speed at which λ and ρ are scaled. If λ grows much faster than ρ shrinks, the limit is Gaussian with long-range dependence, while in the opposite case, the limit is independently scattered with infinite second moments. In a special intermediate scaling regime, there exists a nontrivial limiting random field that is not stable.
  •  
44.
  •  
45.
  • Kaj, Ingemar, 1957-, et al. (författare)
  • Stochastic equations and limit results for some two-type branching models
  • 2019
  • Ingår i: Statistics and Probability Letters. - : Elsevier BV. - 0167-7152 .- 1879-2103. ; 150, s. 35-46
  • Tidskriftsartikel (refereegranskat)abstract
    • A class of binary state, asymmetric, continuous time Markov branching processes are analyzed under supercritical conditions. Stochastic equations are provided, and limit results for the long time asymptotics as well as for the behavior of the model under rescaling are reviewed. Extensions are presented for model variations, such as population size dependence, with the purpose of promoting further use of these models for applications.
  •  
46.
  • Kaj, Ingemar, et al. (författare)
  • Stochastic equilibrium modeling of the TCP dynamics in various AQM environments
  • 2002
  • Ingår i: Proceedings of the 2002 International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS 2002). - San Diego, CA : The Society for Modeling and Simulation International. - 1565552520 ; , s. 481-493
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
  •  
47.
  •  
48.
  •  
49.
  •  
50.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-50 av 111
Typ av publikation
tidskriftsartikel (53)
konferensbidrag (24)
rapport (19)
doktorsavhandling (5)
bokkapitel (4)
annan publikation (3)
visa fler...
licentiatavhandling (2)
bok (1)
visa färre...
Typ av innehåll
refereegranskat (72)
övrigt vetenskapligt/konstnärligt (39)
Författare/redaktör
Kaj, Ingemar (47)
Kjellmer, Ingemar, 1 ... (29)
Lindecrantz, Kaj, 19 ... (24)
Thordstein, Magnus (20)
Löfgren, Nils, 1969 (19)
Flisberg, Anders, 19 ... (15)
visa fler...
Kaj, Ingemar, 1957- (12)
Lindecrantz, Kaj (9)
Bågenholm, Ralph, 19 ... (9)
Cato, Ingemar (6)
Lascoux, Martin (6)
Kaj, Lennart (6)
Brorström-Lundén, Ev ... (6)
Olsson, Torsten, 193 ... (5)
Palm Cousins, Anna (5)
Wallin, G (4)
Seoane, Fernando, 19 ... (4)
Remberger, Mikael (4)
Kjellmer, Ingemar (4)
Dusan, Brita (4)
Göthe, F. (4)
Hedström, A. (4)
Nivall, Stefan, 1961 (4)
Ouchterlony, J. (4)
Thordstein, M. (4)
Biermé, Hermine (4)
Estrade, Anne (4)
Mugal, Carina F (4)
Blennow, Kaj, 1958 (3)
Wolf, Jochen B. W. (3)
Glemin, Sylvain (3)
Andersson, Jeanette (3)
Ekheden, Ylva (3)
Bartoszek, Krzysztof ... (3)
Majchrzak, Marta (3)
Sakowski, Sebastian (3)
Parniewski, Pawel (3)
Löfgren, N. (3)
Björkhem, Ingemar (2)
Andreasson, S (2)
Schmidt, V (2)
Löfgren, Nils (2)
Kivipelto, Miia (2)
Winblad, Bengt (2)
Mallard, Carina, 196 ... (2)
Nordborg, Magnus (2)
Sjödin, Per (2)
Mugal, Carina (2)
Seoane Martinez, Fer ... (2)
Dean, Justin M (2)
visa färre...
Lärosäte
Uppsala universitet (62)
Chalmers tekniska högskola (28)
Göteborgs universitet (22)
Kungliga Tekniska Högskolan (22)
Högskolan i Borås (12)
Karolinska Institutet (9)
visa fler...
IVL Svenska Miljöinstitutet (5)
Stockholms universitet (4)
Linköpings universitet (3)
Lunds universitet (2)
Högskolan i Halmstad (1)
Mälardalens universitet (1)
Jönköping University (1)
Naturvårdsverket (1)
RISE (1)
visa färre...
Språk
Engelska (108)
Svenska (3)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (59)
Medicin och hälsovetenskap (27)
Teknik (19)
Samhällsvetenskap (4)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy