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Search Results: 1 - 10 of 12292 matches for " Kuo Chao Yew "
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Antireflux Endoluminal Therapies: Past and Present
Kuo Chao Yew,Seng-Kee Chuah
Gastroenterology Research and Practice , 2013, DOI: 10.1155/2013/481417
Abstract: The basic principle of antireflux procedures employing endoscopic intervention aims to create a mechanical barrier to prevent primary pathophysiology in gastroesophageal reflux disease (GERD). We review, highlight, and discuss the past and present status of endoluminal therapy. Currently, there are 3 commonly employed anti-reflux endoluminal procedures: fundoplication or suturing techniques (EndoCinch, NDO, and EsophyX), intramural injection or implant techniques (enhancing lower esophageal sphincter (LES) volume and/or strengthening compliance of the LES-Enteryx and Gatekeeper), and radiofrequency ablation of LES and cardia. EndoCinch plication requires further study and modification of technique before it can be recommended because of durability issues. Esophynx, the transoral incisionless fundoplication, may reduce hiatal hernias and increase LES length. Preliminary studies have shown promising reduction in symptoms and medication use but evidence concerning safety and long-term durability is still pending. The safety issue with injection technique is the main concern as evident from the incidences of implant withdrawals after reported major adverse events. Future research with cautious monitoring is required before any new implant material can be recommended for commercial application. Radiofrequency ablation therapy is regaining popularity in treating refractory symptoms despite PPI use due to improved efficacy, durability, and safety after years of refinement of protocol. 1. Introduction Gastroesophageal reflux disease (GERD) is a disease spectrum caused by regurgitation of stomach contents causing troublesome esophageal or extraesophageal symptoms as defined by Montreal definitions [1]. Either mild heartburn and/or regurgitation for at least 2 days per week or moderate to severe symptoms for at least one day per week qualifies as significant symptom-based diagnosis [2]. Phenotypical classifications of GERD are nonerosive reflux disease (NERD), erosive esophagitis (EE), and Barrett’s esophagus (BE). Population-based study reported 15%–20% of the Western population experience reflux on a weekly basis which can lead to impoverishment of a country’s economy and quality of life [3]. Dent et al. reported the prevalence of GERD in Sweden (15.5%), Italy (11.8%), China, Japan, Korea (3.4%–8.5%), and Taiwan (9%–24.6%), respectively [4]. Subanalysis shows that EE and hiatus hernia are more common in Europe than in Asia with the exception of Taiwan which reported similar EE prevalence as Europe. Over years, the prevalence of GERD is increasing by
Concurrent Hepatic and Ruptured Renal Angiomyolipoma in Tuberous Sclerosis Complex.
Cheng-Han Chao,Chin-Yew Lin,Siu-Cheung Chan,Kuo-Su Chen
Chang Gung Medical Journal , 2004,
Abstract: Angiomyolipoma of the liver or kidney is one of the clinical manifestations of tuberoussclerosis complex. However, concurrence of angiomyolipoma in both liver and kidney associatedwith tuberous sclerosis complex is a rare entity. Renal angiomyolipomas with largeaneurysms confer a higher probability of rupture as compared to small aneurysms. Herein,we document a case of tuberous sclerosis coexisting with hepatic and renal angiomyolipomain a 37 year-old woman who presented with an acute abdomen due to ruptured tumor.Computed tomography of the abdomen revealed multiple tumors over the bilateral kidneysand liver. A right nephrectomy was performed. During surgery, a liver biopsy was performedfrom which a preliminary diagnosis of necrosis was established. However, immunoreactivitystaining using monoclonal antibody HMB-45 (Human Melanoma, Black) led to the finaldiagnosis of angiomyolipoma. We emphasized that pathologists and clinicians should beaware that cases of tuberous sclerosis complex may be associated with renal and hepaticangiomyolipoma. To avoid an inappropriate diagnosis, before diagnosing liver necrosis,immunohistochemical staining for HMB-45 is recommended.
Critical nuclear charge and shape resonances for the two-electron systems
Zong-Chao Yan,Yew Kam Ho
Physics , 2015, DOI: 10.1088/1742-6596/635/5/052015
Abstract: The hydrogen negative ion H$^-$ is the simplest two-electron system that exists in nature. This system is not only important in astrophysics but it also serves as an ideal ground to study electron-electron correlations. The peculiar balance of the correlations between the two electrons with the interaction of electron-nucleus in H$^-$ makes this system to have only two bound states, one being the ground state $1s^2\,^{1}\!S^e$ and the other the doubly-excited metastable state $2p^2\,^{3}\!P^e$ embedded below the hydrogen $n=2$ threshold. Here we report a calculation for the $2p^2\,^{3}\!P^e$ state of H$^-$ that yields the energy eigenvalue $E=-0.125\,355\,451\,242\,864\,058\,376\,012\,313\,25(2)$, in atomic units. Our result substantially improves the best available result by 16 orders of magnitude. We further study the critical nuclear charge $Z_{\rm cr}$, the minimum value of nuclear charge $Z$ that is required to bind a nucleus and two electrons. Our determination of $Z_{\rm cr}$ for the $2p^2\,^{3}\!P^e$ state of two-electron systems is $Z_{\rm cr}=0.994\,781\,292\,240\,366\,246\,3(1)$, corresponding to $1/Z_{\rm cr}= 1.005\,246\,085\,546\,985\,509\,4(1)$, which improves the best published value of $Z_{\rm cr}$ by about 10 orders of magnitude. We further investigate in a definitive way the unexplored regime of $Z < Z_{\rm cr}$ using the method of complex scaling and establish precise shape resonance poles for the state of $2p^2\,^{3}\!P^e$ in the complex energy plane.
Primary Intraspinal Mesenchymal Chondrosarcoma:A Case Report and Literature Review
Kuo-Feng Huang,Wen-Ching Tzaan,Chin-Yew Lin
Chang Gung Medical Journal , 2003,
Abstract: Mesenchymal chondrosarcomas are rare malignant tumors of the bone and soft tissue.Extraskeletal mesenchymal chondrosarcomas, especially those that arise in the central nervoussystem, are even rarer. Most of those described were intracranially located, with only avery few cases having been reported in an intraspinal region. Therapeutic experience withprimary spinal mesenchymal chondrosarcomas is also extremely limited. We report on acase of a 21-year-old man with back pain and bilateral progressive weakness and numbnessof the lower extremities. A T1-weighted magnetic resonance image revealed a hypointensetumor located at the T8 level. The tumor was completely excised through a posteriorapproach. Microscopic examination and immunohistochemical studies confirmed the diagnosisof mesenchymal chondrosarcoma. Spinal irradiation and chemotherapy were alsoadministered for prevention of local recurrence and metastasis. The patient has been symptom-free for 1 year after surgery. Herein, we review the 22 cases of primary intraspinal mesenchymalchondrosarcomas in the literature and discuss their clinical presentations, pathology,imaging studies, treatments, and outcomes.
Controllability of Strongly and Weakly Dependent Siphons under Disturbanceless Control  [PDF]
Daniel Yuh Chao, Kuo-Chiang Wu, Jiun-Ting Chen, Mike Y. J. Lee
Intelligent Control and Automation (ICA) , 2011, DOI: 10.4236/ica.2011.24036
Abstract: Li and Zhou propose to add monitors Vs to elementary siphons S only while controlling the rest of dependent siphons - important for large systems but far from being maximally permissive. The control policy for weakly dependent siphons (WDS) is rather conservative due to some negative terms in the controllability. We show that this is no longer true as can be shown that it has the same controllability as that for strongly dependent siphons.
Electromagnetic energy and energy flows in photonic crystals made of arrays of parallel dielectric cylinders
Chao-Hsien Kuo,Zhen Ye
Physics , 2004, DOI: 10.1103/PhysRevE.70.046617
Abstract: We consider the electromagnetic propagation in two-dimensional photonic crystals, formed by parallel dielectric cylinders embedded a uniform medium. The frequency band structure is computed using the standard plane-wave expansion method, and the corresponding eigne-modes are obtained subsequently. The optical flows of the eigen-modes are calculated by a direct computation approach, and several averaging schemes of the energy current are discussed. The results are compared to those obtained by the usual approach that employs the group velocity calculation. We consider both the case in which the frequency lies within passing band and the situation in which the frequency is in the range of a partial bandgap. The agreements and discrepancies between various averaging schemes and the group velocity approach are discussed in detail. The results indicate the group velocity can be obtained by appropriate averaging method.
Sonic crystal lenses that obey Lensmaker's formula
Chao-Hsien Kuo,Zhen Ye
Physics , 2003, DOI: 10.1088/0022-3727/37/15/017
Abstract: This paper presents a theoretical study of the phenomenon of acoustic imaging by sonic crystals, which are made of two-dimensional regular arrays of rigid cylinders placed in parallel in air. The scattering of acoustic waves is computed using the standard multiple scattering theory, and the band structures are computed by the plane-wave expansion method. It is shown that properly arranged arrays not only can behave as acoustic lenses, but also the focusing effect can be well described by Lensmaker's formula. Possible applications are also discussed.
Flat lens imaging does not need negative refraction
Chao-Hsien Kuo,Zhen Ye
Physics , 2003,
Abstract: In a recent communication, Parimi et al. (Nature 426, 404 (2003)) reported the experimental results on imaging by a flat lens made of photonic crystals. They attributed the observed focusing to the negative refraction expected for the Left-Handed-Materials (LHMs). Here we demonstrate that the experimental observation is irrelevant to the negative refraction of LHMs. Rather, the phenomenon is a natural result of the anisotropic scattering by an array of scatterers.
Light deflection by photonic crystals
Chao-Hsien Kuo,Zhen Ye
Physics , 2003, DOI: 10.1016/j.physleta.2004.08.018
Abstract: When propagating through periodically structured media, i. e. photonic crystals, optical waves will be modulated with the periodicity. As a result, the dispersion of waves will no longer behave as in a free space, and so called frequency band structures appear. Under certain conditions, waves may be prohibited from propagation in certain or all directions, corresponding to partial and complete bandgaps respectively. Here we report a new fascinating phenomenon associated with the partial gaps, that is, deflection of optical waves. This phenomenon will render novel applications in manipulating light flows.
Left-Handed-Material-like behavior revealed by arrays of dielectric cylinders
Chao-Hsien Kuo,Zhen Ye
Physics , 2003, DOI: 10.1103/PhysRevE.70.026608
Abstract: We investigate the electromagnetic propagation in two-dimensional photonic crystals, formed by parallel dielectric cylinders embedded a uniform medium. The transmission of electromagnetic waves through prism structures are calculated by the standard multiple scattering theory. The results demonstrate that in certain frequency regimes and when the propagation inside the scattering media is not considered, the transmission behavior mimics that expected for a left-handed material. Such feature may illusively lead to the conclusion that a left-handed material is fabricated and it obeys Snell's law of negative refraction. We also discuss possible ambiguities that may be involved in previous experimental evidence of left-handed materials.
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