180 research outputs found

    A concept–relationship acquisition and inference approach for hierarchical taxonomy construction from tags

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    Author name used in this publication: W. M. WangAuthor name used in this publication: C. F. CheungAuthor name used in this publication: Adela S. M. Lau2009-2010 > Academic research: refereed > Publication in refereed journalAccepted ManuscriptPublishe

    Evidence of the influence of phonon density on Tm³⁺ upconversion luminescence in tellurite and germanate glasses

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    Author name used in this publication: C. L. MakAuthor name used in this publication: W. L. TsuiAuthor name used in this publication: K. H. Wong2001-2002 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

    Manually operated scratch tester for characterization of mechanical properties of thin films

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    Author name used in this publication: Chung Wo OngAuthor name used in this publication: Woon Ming Lau2004-2005 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

    Controllability and controller-observer design for a class of linear time-varying systems

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    “The final publication is available at Springer via http://dx.doi.org/10.1007/s10852-012-9212-6"In this paper a class of linear time-varying control systems is considered. The time variation consists of a scalar time-varying coefficient multiplying the state matrix of an otherwise time-invariant system. Under very weak assumptions of this coefficient, we show that the controllability can be assessed by an algebraic rank condition, Kalman canonical decomposition is possible, and we give a method for designing a linear state-feedback controller and Luenberger observer

    Management of Hepatic Angiomyolipoma

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    Preoperative diagnosis of hepatic angiomyolipoma is difficult, and the treatment for it remains controversial. The aim of this study is to review our experience in the treatment of hepatic angiomyolipoma and to propose a treatment strategy for this disease. We retrospectively collected the clinical, imaging, and pathological features of patients with hepatic angiomyolipoma. Immunohistochemical studies with antibodies for HMB-45, actin, S-100, cytokeratin, vimentin, and c-kit were performed. Treatment experience and long-term follow-up results are summarized. During a period of 9 years, 10 patients with hepatic angiomyolipoma were treated at our hospital. There was marked female predominance (nine patients). Nine patients received surgical resection without complications. One patient received nonoperative management with biopsy and follow-up. One patient died 11 months after surgery because of recurrent disease. We propose all symptomatic patients should receive surgical resection for hepatic angiomyolipoma. Conservative management with close follow-up is suggested in patients with asymptomatic tumors and meet the following criteria: (1) tumor size smaller than 5 cm, (2) angiomyolipoma proved through fine needle aspiration biopsy, (3) patients with good compliance, and (4) not a hepatitis virus carrier
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