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  • 1
    Online Resource
    Online Resource
    Wiley ; 2009
    In:  European Transactions on Telecommunications Vol. 20, No. 2 ( 2009-03), p. 203-215
    In: European Transactions on Telecommunications, Wiley, Vol. 20, No. 2 ( 2009-03), p. 203-215
    Abstract: Mobile systems have recently evolved from being simple devices used for voice communications to systems that support new features such as data transmissions, video streaming and Internet access. The capacity demands to handle these new services led to a new era of wireless technologies. cdma2000 1xEV‐DV is considered to be the solution for the ever‐growing demand of high‐speed wireless packet data transmission. In this paper, we investigate several aspects related to resource management techniques over the cdma2000 1xEV‐DV reverse packet data channel (R‐PDCH). In particular, based on the developed rise over thermal (RoT) model, we provide an upper bound for the R‐PDCH throughput as a function of the number of mobile stations (MSs) that are allowed to transmit instantaneously on each time slot. We also provide a lower bound for the average sector throughput based on the number of users per sector. We propose several autonomous rate assignment, and scheduling techniques that provide a significant throughput improvement relative to other published techniques. Copyright © 2007 John Wiley & Sons, Ltd.
    Type of Medium: Online Resource
    ISSN: 1124-318X , 1541-8251
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2009
    detail.hit.zdb_id: 2108576-6
    detail.hit.zdb_id: 1241059-7
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  • 2
    Online Resource
    Online Resource
    Wiley ; 2011
    In:  Wireless Communications and Mobile Computing Vol. 11, No. 10 ( 2011-10), p. 1331-1340
    In: Wireless Communications and Mobile Computing, Wiley, Vol. 11, No. 10 ( 2011-10), p. 1331-1340
    Abstract: This paper proposes a new cross‐layer optimization algorithm for wireless mesh networks (WMNs). CDMA/TDD (code division multiple access/time division duplex) is utilized and a couple of TDD timeslot scheduling schemes are proposed for the mesh network backbone. Cross‐layer optimization involves simultaneous consideration of the signal to interference‐plus‐noise ratio (SINR) at the physical layer, traffic load estimation and allocation at medium access control (MAC) layer, and routing decision at the network layer. Adaptive antennas are utilized by the wireless mesh routers to take advantage of directional beamforming. The optimization formulation is subject to routing constraints and can be solved by general nonlinear optimization techniques. Comparisons are made with respect to the classic shortest‐path routing algorithm in the network layer. The results reveal that the average end‐to‐end successful packet rate (SPR) can be significantly improved by the cross‐layer approach. The corresponding optimized routing decisions are able to reduce the traffic congestion. Copyright © 2010 John Wiley & Sons, Ltd.
    Type of Medium: Online Resource
    ISSN: 1530-8669 , 1530-8677
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2011
    detail.hit.zdb_id: 2050643-0
    detail.hit.zdb_id: 2045240-8
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  • 3
    Online Resource
    Online Resource
    Wiley ; 2009
    In:  Wireless Communications and Mobile Computing Vol. 9, No. 1 ( 2009-01), p. 61-70
    In: Wireless Communications and Mobile Computing, Wiley, Vol. 9, No. 1 ( 2009-01), p. 61-70
    Abstract: Efficient utilization of bandwidth and high data rates have a great impact on the performance of wireless networks. The cdma2000 1xEV‐DO standard provides high‐speed wireless data services to mobile subscribers based on CDMA technology. In this paper, we study the bandwidth utilization for the 1xEV‐DO packet mode standard. In particular, we develop an analytical model for lowest‐rate‐first, highest‐rate‐first priority scheduling techniques, and two round‐robin fair scheduling techniques over the reverse data channel in cdma2000 1xEV‐DO. For these four scheduling techniques, the distribution of the mobile stations (MSs) among the possible data rates is modeled as a Markov process. An analytical expression for the steady state system throughput is derived from the steady state distribution of the above Markov process. The developed model is validated through simulations. Copyright © 2008 John Wiley & Sons, Ltd.
    Type of Medium: Online Resource
    ISSN: 1530-8669 , 1530-8677
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2009
    detail.hit.zdb_id: 2050643-0
    detail.hit.zdb_id: 2045240-8
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  • 4
    Online Resource
    Online Resource
    Wiley ; 2015
    In:  Earth Surface Processes and Landforms Vol. 40, No. 9 ( 2015-07), p. 1216-1226
    In: Earth Surface Processes and Landforms, Wiley, Vol. 40, No. 9 ( 2015-07), p. 1216-1226
    Abstract: A model was developed for the prediction of the entrainment rate of non‐uniform sediment considering the movement of bedforms. Laboratory experiments were conducted to advance the formulations of the proposed model and to validate and estimate the model parameters. The model parameters were related to the hydraulic conditions of the flow and the properties of the sediment mixtures using dimensional analysis and gene expression programming. The model incorporated four parameters on its formulation, namely the Shields stress and critical Shields stress to describe the hydraulic and sediment conditions of the flow, the Kramer coefficient of uniformity to describe the grain size distribution of a particular sediment mixture, and the relative position of a particular grain size fraction to the geometric mean to describe the entrainment rate of that fraction within the sediment mixture. The proposed model provided satisfactorily predictions with a deviation less than 25% between the measured and predicted values for most of the fractions, which confirms the validity of the proposed approach and model in predicting of the entrainment rates of various fractions. The model predictions were also compared with other models available for the prediction of the entrainment rate of non‐uniform sediment. The model predictions were within the same order of magnitude of the other models’ predictions. Copyright © 2015 John Wiley & Sons, Ltd.
    Type of Medium: Online Resource
    ISSN: 0197-9337 , 1096-9837
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 602320-4
    detail.hit.zdb_id: 1479188-2
    SSG: 14
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  • 5
    Online Resource
    Online Resource
    Wiley ; 2012
    In:  Transactions on Emerging Telecommunications Technologies Vol. 23, No. 1 ( 2012-01), p. 6-15
    In: Transactions on Emerging Telecommunications Technologies, Wiley, Vol. 23, No. 1 ( 2012-01), p. 6-15
    Abstract: A cross‐layer joint optimization approach is proposed for multihop routing in time‐division duplex code‐division multiple‐access wireless mesh networks. Two timeslot scheduling schemes are investigated for time‐division duplex operations. The routing at the network layer, the packet delay at the medium access control layer, and the signal‐to‐interference‐plus‐noise ratio at the physical layer are jointly optimized in a cross‐layer manner. The results show that the proposed cross‐layer optimization algorithm significantly outperforms the shortest‐path routing algorithm with respect to overall network performance. The maximum throughput of the whole mesh network can be optimized by jointly taking into account the end‐to‐end delay and successful packet rate. Copyright © 2011 John Wiley & Sons, Ltd.
    Type of Medium: Online Resource
    ISSN: 2161-3915 , 2161-3915
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2012
    detail.hit.zdb_id: 2652250-0
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  • 6
    Online Resource
    Online Resource
    Wiley ; 1996
    In:  European Transactions on Telecommunications Vol. 7, No. 4 ( 1996-07), p. 297-304
    In: European Transactions on Telecommunications, Wiley, Vol. 7, No. 4 ( 1996-07), p. 297-304
    Abstract: Short codes are known to have better balance and spectral characteristics than their long counterparts. In this work we show by simulations that for certain users loads their bit error performance are excellent. A CDMA network performance is investigated under different load and fading situations. We also investigate the effects of using orthogonal codewords in conjunction with concatenated short codes to further reduce the multi‐user interference in these networks.
    Type of Medium: Online Resource
    ISSN: 1124-318X , 1541-8251
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 1996
    detail.hit.zdb_id: 2108576-6
    detail.hit.zdb_id: 1241059-7
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  • 7
    Online Resource
    Online Resource
    Wiley ; 2007
    In:  European Transactions on Telecommunications Vol. 18, No. 2 ( 2007-03), p. 179-192
    In: European Transactions on Telecommunications, Wiley, Vol. 18, No. 2 ( 2007-03), p. 179-192
    Abstract: This paper presents a channel estimation technique amenable to space‐time coding (STC). An array of transmission antennas operates in band‐limited channels with intersymbol interference. The effectiveness of STC schemes requires the development of practical and high‐performance algorithms for channel estimation. The channel parameters, to be estimated at the reception antennas, are the attenuations and delays incurred by the signals transversal along the different propagation paths. The estimation technique is based on an iterative procedure derived through the maximum a posteriori probability (MAP) approach. Unlike classic estimation techniques, we iterate on the different probabilities of different coefficients rather than the coefficient values themselves. Two practical approaches are proposed, which are simplified versions of the general approach to implement the derived expressions required to estimate the actual channel coefficients. The performance of the two proposed algorithms has been assessed by simulation. Combined analysis/simulation results are presented and compared against those of conventional channel estimation techniques. Simulation results show that the required performance can be achieved with fewer number of iterations compared to conventional techniques. Copyright © 2006 AEIT
    Type of Medium: Online Resource
    ISSN: 1124-318X , 1541-8251
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2007
    detail.hit.zdb_id: 2108576-6
    detail.hit.zdb_id: 1241059-7
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  • 8
    Online Resource
    Online Resource
    Wiley ; 2019
    In:  Neuropathology Vol. 39, No. 6 ( 2019-12), p. 461-466
    In: Neuropathology, Wiley, Vol. 39, No. 6 ( 2019-12), p. 461-466
    Abstract: Chondroma is a benign cartilage‐forming tumor which usually occurs in small bones of extremities but occasionally occurs in the brain. Usually, intracranial chondromas originate from skull base; however, chondroma of the falx cerebri is a very rare condition. We here report a rare case of falcine chondroma in a 19‐year‐old man who had normal physical examination without signs of any syndromic disorder. The neuroimaging findings were inconclusive, and the diagnosis was based on histopathological examination. The purpose of this paper is to raise attention about intracranial chondromas and suggest that chondroma must be ruled out in any patient presenting with masses arising from the falx.
    Type of Medium: Online Resource
    ISSN: 0919-6544 , 1440-1789
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2008290-3
    detail.hit.zdb_id: 1483794-8
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  • 9
    In: Aquaculture Research, Wiley, Vol. 50, No. 5 ( 2019-05), p. 1547-1556
    Type of Medium: Online Resource
    ISSN: 1355-557X , 1365-2109
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 1227359-4
    detail.hit.zdb_id: 2019895-4
    SSG: 21,3
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  • 10
    In: Pediatric Obesity, Wiley, Vol. 18, No. 12 ( 2023-12)
    Abstract: Energy balance‐related behaviours (EBRBs), that is, dietary intake, screen, outdoor play and sleep, tend to combine into ‘lifestyle patterns’, with potential synergistic influences on health. To date, studies addressing this theme mainly focused on school children and rarely accounted for sleep, with a cross‐country perspective. Objectives We aimed at comparing lifestyle patterns among preschool‐aged children across Europe, their associations with socio‐demographic factors and their links with body mass index (BMI). Methods Harmonized data on 2–5‐year‐olds participating in nine European birth cohorts from the EU Child Cohort Network were used (EBRBs, socio‐demographics and anthropometrics). Principal component analysis and multivariable linear and logistic regressions were performed. Results The most consistent pattern identified across cohorts was defined by at least three of the following EBRBs: discretionary consumption, high screen time, low outdoor play time and low sleep duration. Consistently, children from low‐income households and born to mothers with low education level had higher scores on this pattern compared to their socioeconomically advantaged counterparts. Furthermore, it was associated with higher BMI z‐scores in the Spanish and Italian cohorts (β = 0.06, 95% CI = [0.02; 0.10], both studies). Conclusion These findings may be valuable in informing early multi‐behavioural interventions aimed at reducing social inequalities in health at a European scale.
    Type of Medium: Online Resource
    ISSN: 2047-6302 , 2047-6310
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2648531-X
    detail.hit.zdb_id: 2655527-X
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