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    Item type:Publication, Access status: with files ,
    Hull form optimization to lower resistance in still water and added resistance in waves
    (2019-09)
    Hao, Hao
    ;
    Chen, Weimin
    ;
    Li, Chuanqing
    In order to improve operating economy of a container ship, its hydrodynamic performance is improved by optimizing bow and stern hull-forms with parametric hull form generation method. Different optimization algorithms are deployed to obtain the optimum hull form at the condition of design draft and design speed when displacement is defined as a basic constraint. The paper uses STARCCM+ to calculate the resistance in still water, while added resistance is calculated by STF strip method. By comparing the numerical results, a satisfying hull form can be found. Both powering performance and seakeeping performance are improved.
    Publicationtype: Conference Paper
      117  166
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    Item type:Publication, Access status: without files ,
    Dimensioning of the IP-based UTRAN with multiple Node Bs for elastic traffic using DiffServ QoS
    (IEEE, 2009-09)
    Li, Xi
    ;
    Chen, Weimin
    ;
    Timm-Giel, Andreas
    ;
    Görg, Carmelita
    ;
    An, Chunlei
    This paper presents dimensioning of an IP-based UMTS Terrestrial Radio Access Network (UTRAN) with multiple Node Bs connected to one RNC, where the applied QoS architecture is based on Differentiated Service (DiffServ) with an integrated Weighted Fair Queue (WFQ) and Strict Priority (SP) scheduling. To provide an appropriate network dimensioning for guaranteeing a desired end-to-end QoS, a general analytical approach is proposed in this paper to dimension the individual links of the Iub interface (between the Node B and the RNC) and furthermore to derive overbooking for the backbone link for elastic traffic. The analytical approach is validated by simulations. Furthermore, based on the proposed analytical approach, important dimensioning rules are summarized.
    Publicationtype: Conference Paper
      46