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Maximum Flow (maximum + flow)

Distribution by Scientific Domains
Medical Sciences60%

Terms modified by Maximum Flow

  • maximum flow rate
    		•

    Selected Abstracts

    Transobturatory tension-free composite sling for urethral support in patients with stress urinary incontinence: Favorable experience after 1 year follow up

    INTERNATIONAL JOURNAL OF UROLOGY, Issue 6 2006
    IVAN IGNJATOVIC
    Objective:, Symptomatic, anatomic and urodynamic results of a composite transobturatory tension-free sling with an absorbable middle part, in patients with stress urinary incontinence (SUI), were studied. Methods:, A prospective study in 40 women with SUI was performed. Symptoms, urodynamics and anatomical improvements were evaluated separately. Surgery was performed with the transobturatory approach. Results:, All patients had both clinically and urodynamically confirmed SUI. Clinical outcome was favorable in 36/40 (90%) patients, after 1 year. Operation improved the position of the bladder neck (2.8 cm and 1.4 cm below the pubic bone, respectively) and significantly decreased mobility of the bladder neck during abdominal straining (3.3 cm and 1.7 cm, respectively). Both symptoms and quality of life were significantly improved 1 month after the surgery. Postoperative maximum flow was lower than the preoperative one but with borderline significance (25.8 and 23.7 mL/s; P = 0.05). Pressure flow study showed unobstructed voiding both preoperatively and postoperatively. Detrusor pressure at the maximum flow was increased (20, 4 and 22, 8 cmH2O, respectively) but not significantly. Conclusion:, Our results confirmed a high objective cure rate, improvement of symptoms and quality of life, and at the same time, corrected position of the bladder neck and unobstructed voiding. [source]

    An improved direct labeling method for the max,flow min,cut computation in large hypergraphs and applications

    INTERNATIONAL TRANSACTIONS IN OPERATIONAL RESEARCH, Issue 1 2003
    Joachim Pistorius
    Algorithms described so far to solve the maximum flow problem on hypergraphs first necessitate the transformation of these hypergraphs into directed graphs. The resulting maximum flow problem is then solved by standard algorithms. This paper describes a new method that solves the maximum flow problem directly on hypergraphs, leading to both reduced run time and lower memory requirements. We compare our approach with a state,of,the,art algorithm that uses a transformation of the hypergraph into a directed graph and an augmenting path algorithm to compute the maximum flow on this directed graph: the run,time complexity as well as the memory space complexity are reduced by a constant factor. Experimental results on large hypergraphs from VLSI applications show that the run time is reduced, on average, by a factor approximately 2, while memory occupation is reduced, on average, by a factor of 10. This improvement is particularly interesting for very large instances, to be solved in practical applications. [source]

    The multiroute maximum flow problem revisited

    NETWORKS: AN INTERNATIONAL JOURNAL, Issue 2 2006
    Donglei Du
    Abstract We are given a directed network G = (V,A,u) with vertex set V, arc set A, a source vertex s , V, a destination vertex t , V, a finite capacity vector u = {uij}(i,j),A, and a positive integer m , Z+. The multiroute maximum flow problem (m -MFP) generalizes the ordinary maximum flow problem by seeking a maximum flow from s to t subject to not only the regular flow conservation constraints at the vertices (except s and t) and the flow capacity constraints at the arcs, but also the extra constraints that any flow must be routed along m arc-disjoint s - t paths. In this article, we devise two new combinatorial algorithms for m -MFP. One is based on Newton's method and another is based on an augmenting-path technique. We also show how the Newton-based algorithm unifies two existing algorithms, and how the augmenting-path algorithm is strongly polynomial for case m = 2. © 2006 Wiley Periodicals, Inc. NETWORKS, Vol. 47(2), 81,92 2006 [source]

    Urodynamic evaluation of the human bladder response tgo an increase in outlet resistance

    NEUROUROLOGY AND URODYNAMICS, Issue 6 2002
    Jason D. Engel
    Abstract Aim. We prospectively evaluated the response of the human bladder to a chronic increase in urethral resistance according to the indices of pressure, volume flow rate, total (external) bladder work, and maximum and average detrusor power. Methods. Six men with incontinence after radical prostatectomy were evaluated urodynamically before and 3,6 months after undergoing a bulbourethral sling procedure. Results. None of the men suffered from significant obstructive or irritative voiding symptoms preoperatively. Urodynamic evaluation showed postoperative increases in both average detrusor pressure and pressure at maximum flow, but there were no significant changes in voided volume, void time, or postvoid residual urine volume. Maximum detrusor power, average detrusor power, and total (external) bladder work were all significantly increased. Conclusion. These data confirm that the human bladder possesses a functional reserve, which is elicited by an increase in urethral resistance. Neurourol. Urodynam. 21:524,528, 2002. © 2002 Wiley-Liss, Inc. [source]