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Search Results: 1 - 10 of 1674 matches for " Osamu Uchida "
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Product Reputation Trend Extraction from Twitter  [PDF]
Aizhan Bizhanova, Osamu Uchida
Social Networking (SN) , 2014, DOI: 10.4236/sn.2014.34024
Abstract:

Micro-blogging today has become a very popular communication tool among the Internet users. Real-time web services such as Twitter allow users to express their opinions and interests, often expressed in the form of short text messages. Many business companies are looking into utilizing these data streams in order to improve their marketing campaigns, refine advertising and better meet their customer needs. In this study, we focus on using Twitter, for the task of extraction product reputation trend. Thus, business could gauge the effectiveness of a recent marketing campaign by aggregating user opinions on Twitter regarding their product. In this paper, we introduce an approach for automatically classifying the sentiment of Twitter messages toward product/brand, using emoticons and by improving pre-processing steps in order to achieve high accuracy.

A Single-Feed Planar Antenna for Terrestrial Dtv Reception in Mobile Communication
Herman Hideyuki Uchida;Hiroyasu Matsui;Osamu Mikami;Toshio Wakabayashi
PIER C , 2011, DOI: 10.2528/PIERC11081203
Abstract: Japanese terrestrial broadcasting was completely converted to digital television (DTV) broadcasting on 470--710\,MHz as of July 2011. However, fading phenomenon resulting from standing waves is a factor in quality deterioration in TV and mobile communication technologies. Suppression of this is needed for many kinds of technologies. A broadband single-feed planar antenna composed of two antenna components, a Broadband Planar Monopole Antenna (B-PMA) and a Broadband Planar Slot Antenna (B-PSA), is proposed for reducing deterioration of reception due to the fading across the DTV band. Reflection coefficients and radiation patterns analyzed by the Finite Difference Time Domain (FDTD) method and compared with measured results indicate that the proposed antenna is broadband compared with a conventional antenna studied previously. A field experiment is conducted in the DTV band. The results of the field experiment indicate clearly that the proposed antenna efficiently suppresses fading resulting from standing waves across the band.
Single-Feed Planar Antenna for Suppressing the Change in Received Signal Level Due to Standing Waves in Mobile Communication
Herman Hideyuki Uchida;Hiroyasu Matsui;Osamu Mikami;Toshio Wakabayashi
PIER B , 2011, DOI: 10.2528/PIERB11020311
Abstract: The fading phenomenon resulting from standing waves is a factor in quality deterioration in mobile communication technologies (e.g., cellular phones and television receivers). Suppression of this fading phenomenon is needed for many kinds of technologies. A single-feed planar antenna composed of two antenna components, a Planar Monopole Antenna (PMA) and a Planar Slot Antenna (PSA), is proposed for reducing deterioration of reception due to the fading phenomenon. Reflection coefficient and radiation patterns are analyzed by the Finite Difference Time Domain (FDTD) method and compared with measured results. Results indicate that the proposed antenna has a resonant frequency with functions of the PMA and the PSA. The results of a field experiment at 583.76MHz in the Ultra High Frequency (UHF) band indicate that the proposed antenna efficiently suppresses the fading phenomenon resulting from multipath propagation.
Advances in Angioscopic Imaging of Vascular Disease  [PDF]
Yasumi Uchida, Yasuto Uchida
World Journal of Cardiovascular Surgery (WJCS) , 2012, DOI: 10.4236/wjcs.2012.24021
Abstract:

Percutaneous angioscopy, using high resolution fiberoptic imaging, allows direct and two-dimensional visualization of the vascular interior, thereby enabling macroscopic pathological diagnosis. Percutaneous angioscopy has revealed that the vascular luminal surface exhibits various colors and morphologies characteristic of different vascular diseases. This imaging technique is used for evaluation of the severity of vascular diseases, staging of atherosclerosis, analysis of thrombus composition, evaluation of interventional and surgical therapies, and for guidance of intravascular interventions such as angioplasty, venous valvuloplasty and aortic stentgrafting. Recently, dye-image angioscopy has been used clinically for analyses of thrombus composition, endothelial damage and plaque composition. Intravascular microscopy was also developed for cellular imaging of vascular disease. Furthermore, fluorescent angioscopy was developed for molecular imaging of substances comprising atherosclerotic plaques. In this article, we describe the history of the development of angioscopy, angioscopic systems and techniques, angioscopic changes associated with vascular diseases, angioscope-guided intravascular therapies, and evaluation of intravascular and surgical therapies. Angioscopic pictures, except those of the coronary arteries, have rarely been published in the literature, so we have included many representative angioscopic pictures obtained by the authors in this article.

Single-incision laparoscopic cholecystectomy: Single institution experience and literature review
Yasumitsu Hirano, Toru Watanabe, Tsuneyuki Uchida, Shuhei Yoshida, Kanae Tawaraya, Hideaki Kato, Osamu Hosokawa
World Journal of Gastroenterology , 2010,
Abstract: Single-incision laparoscopic surgery is a rapidly evolving field as a bridge between traditional laparoscopic surgery and natural orifice transluminal endoscopic surgery. We report one of the initial clinical experiences in Japan with this new technique. Four cases of gallbladder diseases were selected for this new technique. A single curved intra-umbilical 25-mm incision was made by pulling out the umbilicus. A 12-mm trocar was placed through an open approach, and the abdominal cavity was explored with a 10-mm semi-flexible laparoscope. Two 5-mm ports were inserted laterally from the laparoscope port. A 2-mm mini-loop retractor was inserted to retract the fundus of the gallbladder. Dissection was performed using an electric cautery hook and an Endograsper roticulator. There were two women and two men with a mean age of 50.5 years (range: 40-61 years). All procedures were completed successfully without any perioperative complications. In all cases, there was no need to extend the skin incision. Average operative time was 88.8 min. Postoperative follow-up didnot reveal any umbilical wound complication. Single-incision laparoscopic cholecystectomy is feasible and a promising alternative method as scarless abdominal surgery for the treatment of some patients with gallbladder disease.
Soluble Isoform of the Receptor for Advanced Glycation End Products as a Biomarker for Postoperative Respiratory Failure after Cardiac Surgery
Tokujiro Uchida, Nagara Ohno, Miho Asahara, Yoshitsugu Yamada, Osamu Yamaguchi, Makoto Tomita, Koshi Makita
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0070200
Abstract: Purpose Postoperative respiratory failure is a major problem which can prolong the stay in the intensive care unit in patients undergoing cardiac surgery. We measured the serum levels of the soluble isoform of the receptor for advanced glycation end products (sRAGE), and we studied its association with postoperative respiratory failure. Methods Eighty-seven patients undergoing elective cardiac surgery were enrolled in this multicenter observational study in three university hospitals. Serum biomarker levels were measured perioperatively, and clinical data were collected for 7 days postoperatively. The duration of mechanical ventilation was studied for 28 days. Results Serum levels of sRAGE elevated immediately after surgery (median, 1751 pg/mL; interquartile range (IQR) 1080–3034 pg/mL) compared with the level after anesthetic induction (median, 884 pg/mL; IQR, 568–1462 pg/mL). Postoperative sRAGE levels in patients undergoing off-pump coronary artery bypass grafting (median, 1193 pg/mL; IQR 737–1869 pg/mL) were significantly lower than in patients undergoing aortic surgery (median, 1883 pg/mL; IQR, 1406–4456 pg/mL; p = 0.0024) and valve surgery (median, 2302 pg/mL; IQR, 1447–3585 pg/mL; p = 0.0005), and postoperative sRAGE correlated moderately with duration of cardiopulmonary bypass (rs = 0.44, p<0.0001). Receiver operating characteristic curve analysis demonstrated that postoperative sRAGE had a predictive performance with area under the curve of 0.81 (95% confidence interval 0.71–0.88) for postoperative respiratory failure, defined as prolonged mechanical ventilation >3 days. The optimum cutoff value for prediction of respiratory failure was 3656 pg/mL, with sensitivity and specificity of 62% and 91%, respectively. Conclusions Serum sRAGE levels elevated immediately after cardiac surgery, and the range of elevation was associated with the morbidity of postoperative respiratory failure. Early postoperative sRAGE levels appear to be linked to cardiopulmonary bypass, and may have predictive performance for postoperative respiratory failure; however, large-scale validation studies are needed.
Magnetic Resonance Findings of the Corpus Callosum in Canine and Feline Lysosomal Storage Diseases
Daisuke Hasegawa, Shinji Tamura, Yuya Nakamoto, Naoaki Matsuki, Kimimasa Takahashi, Michio Fujita, Kazuyuki Uchida, Osamu Yamato
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0083455
Abstract: Several reports have described magnetic resonance (MR) findings in canine and feline lysosomal storage diseases such as gangliosidoses and neuronal ceroid lipofuscinosis. Although most of those studies described the signal intensities of white matter in the cerebrum, findings of the corpus callosum were not described in detail. A retrospective study was conducted on MR findings of the corpus callosum as well as the rostral commissure and the fornix in 18 cases of canine and feline lysosomal storage diseases. This included 6 Shiba Inu dogs and 2 domestic shorthair cats with GM1 gangliosidosis; 2 domestic shorthair cats, 2 familial toy poodles, and a golden retriever with GM2 gangliosidosis; and 2 border collies and 3 chihuahuas with neuronal ceroid lipofuscinoses, to determine whether changes of the corpus callosum is an imaging indicator of those diseases. The corpus callosum and the rostral commissure were difficult to recognize in all cases of juvenile-onset gangliosidoses (GM1 gangliosidosis in Shiba Inu dogs and domestic shorthair cats and GM2 gangliosidosis in domestic shorthair cats) and GM2 gangliosidosis in toy poodles with late juvenile-onset. In contrast, the corpus callosum and the rostral commissure were confirmed in cases of GM2 gangliosidosis in a golden retriever and canine neuronal ceroid lipofuscinoses with late juvenile- to early adult-onset, but were extremely thin. Abnormal findings of the corpus callosum on midline sagittal images may be a useful imaging indicator for suspecting lysosomal storage diseases, especially hypoplasia (underdevelopment) of the corpus callosum in juvenile-onset gangliosidoses.
Fairness Norms and the Incidence of Environmental Subsidy  [PDF]
Toshihiro Uchida
Modern Economy (ME) , 2012, DOI: 10.4236/me.2012.36100
Abstract: Although fairness concerns are frequently discussed in the real world environmental politics, their effects are relatively neglected in the environmental economics literature. Using a survey method, this paper attempts to reveal how fairness norms affect the incidence of subsidy both in the short-run and long-run. The results indicate that statutory incidence (legal right to receive subsidy) affects people’s fairness norms on who should receive subsidy. In particular it is considered unfair for a firm to receive a part of the subsidy when it is legally granted to the consumer side. If firms avoid behaviors that are considered unfair, the tax and subsidy equivalence theorem may not hold under this situation. The survey results also reveal that fairness norms affect the incidence of subsidy in the long-run, in a sense that the allocation of gains that are generated due to subsidy is affected. People find it fair if allocation is made in proportion to firms’ own effort. Therefore, if an increase in profit is achieved by activities directly supported by subsidy, people find it less justifiable for firms to keep all the gains by themselves and thus firms may be forced to share the gains with consumers.
High-Quality Three-Dimensional Computed Tomography Angiography of Abdominal Viscera with Small Focal Spot, Low Tube Voltage, and Iterative Model Reconstruction Technique  [PDF]
Masafumi Uchida
Open Journal of Radiology (OJRad) , 2015, DOI: 10.4236/ojrad.2015.51002
Abstract: Purpose: To evaluate the quality of three-dimensional (3D) CT angiography images of the abdominal viscera with small focal spot, low tube voltage, and iterative model reconstruction technique (IMR). Materials and Methods: Seven patients with suspected disease of the pancreatobiliary system had undergone CT with high-quality CTA protocol in the present study. There were 5 men and 2 women, ranging in age from 52 to 80 years (mean: 64 years). Results: Depiction of abdominal small artery, small portal vein was possible in all cases. In two cases that we were able to compare, it was superior to standard CTA in small vascular depiction in CTA made clearly in high quality protocol. Conclusions: Although the use of small focal spot, low tube voltage, and IMR can produce higher-quality images of abdominal vessels than standard CTA, this improvement is not significant at elevated radiation doses.
High-Resolution Micro-Siting Technique for Large Scale Wind Farm Outside of Japan Using LES Turbulence Model  [PDF]
Takanori Uchida
Energy and Power Engineering (EPE) , 2017, DOI: 10.4236/epe.2017.912050
Abstract: The spatial distribution of wind speed varies greatly over steep complex terrain, thus the selection of an optimal site in such terrain for wind turbine construction requires great care. We have developed a numerical model for simulating unsteady flows called RIAM-COMPACT (Research Institute for Applied Mechanics, Kyushu University, COM putational Prediction of Airflow over Complex Terrain), which is based on the LES (Large-Eddy Simulation) technique. The computational domain of RIAM-COMPACT can be varied from several meters to several kilometers, and the model is able to predict airflow over complex terrain with high accuracy. The present paper discusses the application of RIAM-COMPACT to the micro-siting of wind turbines at sites outside Japan. The results from two case studies will be presented.
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