This paper presents a low-pressure experimental validation of two-phase transient pipeline flow model. Measured pressure and rate data are collected for slug froth patterns at the low 6 bar National University Singapore Multiphase Flow Loop facility. The analyzed low-dimensional model proposed in comprises steady-state multiphase series with linear dynamic capturing transients. is based on diss...

The recent availability of high-resolution remote sensing technology provides a new data source for urban geospatial data acquisition, which has made it possible to detect buildings quickly and automatically. The building data are used for a variety of applications, including urban planning, land-use monitoring, map updating, and 3D city modeling. However, conventional approaches for building e...

This paper presents a novel two-step approach that incorporates fuzzy c-means (FCMs) clustering and gradient vector flow (GVF) snake algorithm for lesions contour segmentation on breast magnetic resonance imaging (BMRI). Manual delineation of the lesions by expert MR radiologists was taken as a reference standard in evaluating the computerized segmentation approach. The proposed algorithm was a...

Breast cancer is one of the most common diseases diagnosed among female cancer patients. Early detection of breast cancer is needed to reduce the risk of fatality of this disease as no cure has been found yet for this illness. This research is conducted to improve the Gradient Vector Flow (GVF) Snake Active Contour segmentation technique in mammography segmentation. Segmentation of the mammogra...

This paper presents discussions on experimental result evaluation outcomes of a new liver volume segmentation method developed for 10 specified CT image datasets. Precise liver surface segmentation is the first step and one of the major tasks in individual surgical resection virtual reality simulations. There are five major difficulties: Firstly, the automatic initialization of liver detection ...

We present a novel approach for detection of tubular objects in medical images. Conventional tube detection / lineness filters make use of local derivatives at multiple scales using a linear scale space; however, using a linear scale space may result in an undesired diffusion of nearby structures into one another and this leads to problems such as detection of two tangenting tubes as one single...

Skeleton extraction and visualization of 3D reconstructed target objects from multiple views continues to be a major challenge in terms of providing intuitive and uncluttered images that allow the users to understand their data. This paper presents a three-dimensional skeleton extraction technique of deformable objects based on a normalized gradient vector flow in order to analyze and visualize...

This paper proposes a new solution method for the leakage and static characteristics of smooth annular seal under homogeneous gas-liquid two-phase flow based on bulk-flow model. In this method, Rayleigh–Plesset equation is introduced into governing equations to describe behavior bubbles considering mixture compressibility. Detailed comparisons between Childs’ experimental rates predicted ones p...

This paper introduces a novel combinatorial algorithm to compute a hierarchy of discrete gradient vector fields for three-dimensional scalar fields. The hierarchy is defined by an importance measure and represents the combinatorial gradient flow at different levels of detail. The presented algorithm is based on Forman’s discrete Morse theory, which guarantees topological consistency and algorit...

We establish conditions under which the worldsheet β-functions of logarithmic conformal field theories can be derived as the gradient of some scalar function on the moduli space of running coupling constants. We derive a renormalization group invariant version of this function and relate it to the usual Zamolodchikov C-function expressed in terms of correlation functions of the worldsheet energ...