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Search Results: 1 - 10 of 117853 matches for " T. Emura "
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Two-dimensional Dirac fermions with random axial-vector potential
T. Fukui,H. Emura,H. Yamada
Physics , 2002, DOI: 10.1103/PhysRevB.65.153301
Abstract: A Dirac fermion model with random axial-vector potential is proposed. At a special strength of randomness, the symmetry of the action is enhanced, which is due to the gauge symmetry \`a la Nishimori. Some exact scaling exponents of single-particle Green functions are computed. The relationship with the XY gauge glass model is discussed.
Measurement of the trailing edge of cosmic-ray track signals from a round-tube drift chamber
M. Abe,T. Emura,S. Odaka
Physics , 1999, DOI: 10.1016/S0168-9002(00)00360-0
Abstract: The trailing edge of tube drift-chamber signals for charged particles is expected to provide information concerning the particle passage time. This information may be useful for separating meaningful signals from overlapping garbage at high-rate experiments, such as the future LHC experiments. We carried out a cosmic-ray test using a small tube chamber in order to investigate the feasibility of this idea. We achieved a trailing-edge time resolution of 12 ns in rms by applying simple pulse shaping to eliminate a signal tail. A comparison with a Monte Carlo simulation indicates the importance of well-optimized signal shaping to achieve good resolution. The resolution may be further improved with better shaping.
Self-Organized Synchronization Phenomena in Spatiotemporal Coupled Oscillator Model for Emergent Systems
Tetsuji Emura
Journal of Systemics, Cybernetics and Informatics , 2005,
Abstract: The author proposes a spatiotemporal coupled Lorenz model with an excitatory-excitatory connection or an excitatory-inhibitory connection, which consists of three temporal coupling coefficients c1,2,3 and three spatial coupling coefficients d1,2,3. This model is an emergent device that has synchronized three nonlinear oscillators. In this study, the author discovers that self-organized various phase transition phenomena appear in this model in changing the values of c1,2,3 and d1,2,3 in the case of using the excitatory-inhibitory connection. Proposed model also concerns the neural population model for autonomous agent.
La disección endoscópica de la submucosa produce menos bordes positivos que la mucosectomía en cáncer gástrico temprano Endoscopic submucosal dissection produces less positive edges than mucosectomy in early gastric cancer
Fabián Emura,Ichiro Oda
Revista Colombiana de Gastroenterologia , 2010,
Abstract:
Diagnóstico y tratamiento endoscópico del cáncer gástrico estado 0.: Qué hacer para que aumente más?
Fabián Emura,Ichiro Oda
Revista Colombiana de Gastroenterologia , 2009,
Abstract:
Disección endoscópica de la submucosa (DES): Un procedimiento superior a la muco-sectomía para el tratamiento del cáncer gástrico temprano
Emura,Fabián; Oda,Ichiro; Ono,Hiroyuki;
Revista Colombiana de Gastroenterologia , 2007,
Abstract: the new development in endoscopic techniques like endoscopic submucosal dissection (esd) has revolutionized the minimally invasive treatment of gastric cancer. different to conventional surgery, now it is possible treat large and ulcerative lesion with esd and with low morbimortality. esd constitutes a new development that allows direct visualization and cutting of the submucosal layer using el it-knife. although mucosectomy is minimally invasive and safe, it is limited for the treatment of lesions >15 mm. evidence suggests that if larger lesions are treated by this technique the resection will probably be a piecemeal resection due to limitations of standard mucosectomy. the largest series has reported 1033 esd using the it-knife in 945 patients. the en-block resection rate was 98% (1008/1033) and the rate en-block resection and negative margins was 93% (957/1033). in spite of these promising results, the complications rate is higher than that of standard mucosectomy since esd needs high levels of endoscopic skills and experience. in addition evaluation of long term results is still ongoing. a detailed histological analysis along with adhesion to strict inclusion criteria are determinant for the reproducibility of success of des in the west
Disección endoscópica de la submucosa (DES): Un procedimiento superior a la muco-sectomía para el tratamiento del cáncer gástrico temprano Endoscopic Submucosal Dissection: A more effective procedure compared to mucosectomy for the treatment of Early Gastric Cancer
Fabián Emura,Ichiro Oda,Hiroyuki Ono
Revista Colombiana de Gastroenterologia , 2007,
Abstract: El desarrollo de nuevas técnicas endoscópicas como la disección endoscópica de la submucosa (DES) ha revolucionado el manejo mínimamente invasivo del cáncer gástrico. A diferencia de la cirugía convencional, ahora es posible tratar con esta técnica y con baja morbimortalidad lesiones grandes y ulceradas. La DES constituye un nuevo desarrollo que permite la disección bajo visión directa de la capa submucosa con el bisturí endoscópico (IT-knife). La mucosectomía es mínimamente invasiva y segura, pero insuficiente para el tratamiento de lesiones >15 mm. La evidencia sugiere que cuando estas lesiones son resecadas con esta técnica, la resección tiene una alta probabilidad de ser en "pedazos" (piecemeal) debido a las limitaciones técnicas de la mucosectomía estándar. En la serie más grande hasta ahora reportada, se trataron 1033 CGT por resección endoscópica en 945 pacientes usando el IT-Knife. La DES con el IT-Knife demostró mayor número de resecciones en bloque, de márgenes negativos y de resecciones curativas comparado con la mucosectomía estándar. La frecuencia total de resección en bloque fue del 98% (1008/1033) y la frecuencia total de lesiones con márgenes negativos fue 93% (957/1033). A pesar de lo promisorio de esta nueva técnica, la frecuencia de complicaciones es más alta comparada con la técnica convencional pues necesita habilidad endoscópica de alto nivel y experiencia. En adición, los datos a largo plazo están siendo evaluados. Un minucioso análisis histopatológico con estrictos criterios de inclusión son determinantes para la reproducibilidad del éxito de la ESD en occidente The new development in endoscopic techniques like endoscopic submucosal dissection (ESD) has revolutionized the minimally invasive treatment of gastric cancer. Different to conventional surgery, now it is possible treat large and ulcerative lesion with ESD and with low morbimortality. ESD constitutes a new development that allows direct visualization and cutting of the submucosal layer using el IT-Knife. Although mucosectomy is minimally invasive and safe, it is limited for the treatment of lesions >15 mm. Evidence suggests that if larger lesions are treated by this technique the resection will probably be a piecemeal resection due to limitations of standard mucosectomy. The largest series has reported 1033 ESD using the IT-knife in 945 patients. The en-block resection rate was 98% (1008/1033) and the rate en-block resection and negative margins was 93% (957/1033). In spite of these promising results, the complications rate is higher than that of standard mucosectomy sinc
Narrow-band imaging optical chromocolonoscopy: Advantages and limitations
Fabian Emura, Yutaka Saito, Hiroaki Ikematsu
World Journal of Gastroenterology , 2008,
Abstract: Narrow-band imaging (NBI) is an innovative optical technology that modifies the center wavelength and bandwidth of an endoscope’s light into narrow-band illumination of 415 ± 30 nm. NBI markedly improves capillary pattern contrast and is an in vivo method for visualizing microvessel morphological changes in superficial neoplastic lesions. The scientific basis for NBI is that short wavelength light falls within the hemoglobin absorption band, thereby facilitating clearer visualization of vascular structures. Several studies have reported advantages and limitations of NBI colonoscopy in the colorectum. One difficulty in evaluating results, however, has been non-standardization of NBI systems (Sequential and non-sequential). Utilization of NBI technology has been increasing worldwide, but accurate pit pattern analysis and sufficient skill in magnifying colonoscopy are basic fundamentals required for proficiency in NBI diagnosis of colorectal lesions. Modern optical technology without proper image interpretation wastes resources, confuses untrained endoscopists and delays inter-institutional validation studies. Training in the principles of “optical image-enhanced endoscopy” is needed to close the gap between technological advancements and their clinical usefulness. Currently available evidence indicates that NBI constitutes an effective and reliable alternative to chromocolonoscopy for in vivo visualization of vascular structures, but further study assessing reproducibility and effectiveness in the colorectum is ongoing at various medical centers.
Tibetan Medicated-Bath Therapy May Improve Adjuvant Arthritis in Rat
Huayue Chen,Shizuko Shoumura,Shoichi Emura,Hideo Isono
Evidence-Based Complementary and Alternative Medicine , 2009, DOI: 10.1093/ecam/nem083
Abstract: Tibetan medicated-bath therapy has been applied to patients with rheumatoid arthritis for centuries. However, the detailed action mechanism of Tibetan medicated-bath therapy on the morphology and function of joints remains unknown. We designed our investigation to evaluate the efficacy of Tibetan medicated-bath therapy on adjuvant arthritis (AA) of rats in comparison with water-bath and dexamethasone administration. AA was induced by intradermal injection of Mycobacterium butyricum suspended in sterile mineral oil. The control animals were similarly injected with sterile vehicle. Eight days after injection, rats were treated with fresh-water bath, Tibetan medicated-bath (40°C, 15 min) or intramuscular injection with dexamethasone for 21 consecutive days after which we evaluated the severity of arthritis visually and microscopically and measured serum interleukin (IL)-6 and tumor necrosis factor (TNF)-α levels. While arthritis did not significantly change after water-bath treatment, the Tibetan medicated-bath and dexamethasone groups showed diminished joint swelling and alleviation of, inflammatory cell infiltration and the destruction of bone and cartilage. Serum IL-6 and TNF-α levels significantly decreased. Our results demonstrated that Tibetan medicated-bath therapy exerted a reliable effect on rat adjuvant arthritis, which may be involved in the inflammatory cytokines, IL-6 and TNF-α. Our data provide evidence for clinical use of Tibetan-medicated bath therapy for arthritis patients.
Survival Prediction Based on Compound Covariate under Cox Proportional Hazard Models
Takeshi Emura, Yi-Hau Chen, Hsuan-Yu Chen
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0047627
Abstract: Survival prediction from a large number of covariates is a current focus of statistical and medical research. In this paper, we study a methodology known as the compound covariate prediction performed under univariate Cox proportional hazard models. We demonstrate via simulations and real data analysis that the compound covariate method generally competes well with ridge regression and Lasso methods, both already well-studied methods for predicting survival outcomes with a large number of covariates. Furthermore, we develop a refinement of the compound covariate method by incorporating likelihood information from multivariate Cox models. The new proposal is an adaptive method that borrows information contained in both the univariate and multivariate Cox regression estimators. We show that the new proposal has a theoretical justification from a statistical large sample theory and is naturally interpreted as a shrinkage-type estimator, a popular class of estimators in statistical literature. Two datasets, the primary biliary cirrhosis of the liver data and the non-small-cell lung cancer data, are used for illustration. The proposed method is implemented in R package “compound.Cox” available in CRAN at http://cran.r-project.org/.
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