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Image-based fall detection and classification of a user with a walking support system

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Frontiers of Mechanical Engineering 2018年第3期13卷 427-441页

作者： Sajjad TAGHVAEI kazuhiro KOSUGE School of Mechanical Engineering Shiraz University Shiraz 71936- 16548 Iran Department of Bioengineering and Robotics Tohoku University Sendai 980-8579 Japan

The classification of visual human action is important in the development of systems that interact with humans. This study investigates an image-based classifica- tion of the human state while using a walking support system to improve the safety and dependability of these systems. We categorize the possible human behavior while utilizing a walker robot into eight states （i.e., sitting, standing, walking, and five falling types）, and propose two different methods, namely, normal distribution and hidden Markov models （HMMs）, to detect and recognize these states. The visual feature for the state classification is the centroid position of the upper body, which is extracted from the user＇s depth images. The first method shows that the centroid position follows a normal distribution while walking, which can be adopted to detect any non-walking state. The second method implements HMMs to detect and recognize these states. We then measure and compare the performance of both methods. The classification results are employed to control the motion of a passive-type walker （called ＂RT Walker＂） by activating its brakes in nonwalking states. Thus, the system can be used for sit/stand support and fall prevention. The experiments are performed with four subjects, including an experienced physiotherapist. Results show that the algorithm can be adapted to the new user＇s motion pattern within 40 s, with a fall detection rate of 96.25% and state classification rate of 81.0%. The proposed method can be implemented to other abnormality detection/classification applications that employ depth image-sensing devices.

关键词： fall detection walking support hidden Markov model multivariate analysis

Nonalcoholic steatohepatitis-associated hepatocellular carcinoma:Our case series and literature review

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World Journal of Gastroenterology 2010年第12期16卷 1436-1441页

作者： Yoshitaka Takuma kazuhiro Nouso Department of Gastroenterology Kurashiki Central Hospital Department of Internal Medicine National Hospital Organization Iwakuni Clinical Center Department of Molecular Hepatology Okayama University Graduate School of MedicineDentistryand Pharmaceutical Sciences

Recently,nonalcoholic steatohepatitis(NASH) has been considered to be another cause of liver cirrhosis and hepatocellular carcinoma(HCC).The natural history and prognosis of NASH are ***,we assessed the clinicopathological features of NASH-associated HCC in our experience and reviewed the literature of NASH-associated *** experienced 11 patients with NASH-associated HCC(6 male,5 female;mean age 73.8 ± 4.9 years) who received curative ***(91%) patients had been diagnosed with obesity,diabetes,hypertension,or *** patients(64%) also had a non-cirrhotic *** recurrence-free survival rates at 1,3 and 5 years were 72%,60%,and 60%.We also summarized and reviewed 94 cases of NASH-associated HCC which were reported in the literature(64 male;mean age 66 years).The majority of patients(68%) were obese,66% of patients had diabetes,and 24% had ***,26% of the HCCs arose from the non-cirrhotic *** conclusion,patients with non-cirrhotic NASH may be a high-risk group for HCC,and regular surveillance for HCC is necessary in non-cirrhotic NASH patients as well as cirrhotic patients.

关键词： Nonalcoholic steatohepatitis Hepatocellular carcinoma Nonalcoholic fatty liver disease Cryptogenic cirrhosis

Surveillance using trimodal imaging endoscopy after endoscopic submucosal dissection for superficial gastric neoplasia

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World Journal of Gastroenterology 2014年第43期20卷 16311-16317页

作者： Hiroyuki Imaeda Naoki Hosoe kazuhiro Kashiwagi Yosuke Ida Rieko Nakamura Hidekazu Suzuki Yoshimasa Saito Naohisa Yahagi Yasushi Iwao Yuko Kitagawa Toshifumi Hibi Haruhiko ogata Takanori Kanai Department of General Internal Medicine Saitama Medical UniversitySaitama 350-0495Japan Center for Diagnostic and Therapeutic Endoscopy School of MedicineKeio UniversityTokyo 108-8345Japan Division of Gastroenterology Department of Internal MedicineSchool of MedicineKeio UniversityTokyo 108-8345Japan Cancer Center School of MedicineKeio UniversityTokyo 108-8345Japan Center for Preventive Medicine School of MedicineKeio UniversityTokyo 108-8345Japan Department of Surgery School of MedicineKeio UniversityTokyo 108-8345Japan

AIM: To evaluate the effectiveness of trimodal imaging endoscopy (TME) to detect another lesion after endoscopic submucosal dissection (ESD) for superficial gastric neoplasia (SGN).

关键词： Autofluorescence imaging Endoscopic submucosal dissection Superficial gastric neoplasia

Metal-free catalytic reduction of aldehydes,ketones,aldimines,and ketimines

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Chinese Chemical Letters 2010年第11期21卷 1314-1317页

作者： Hiroaki Matsuoka kazuhiro Kondo Graduate School of Medical Sciences Nagoya City University Graduate School of Pharmaceutical Sciences Nagoya City University

The metal-free combination of catalytic amounts of PPh3,B（C6F5）3,and PhSiH_3 can efficiently hydrosilylate aldehydes, ketones,aldimines and ketimines to afford the corresponding reduction products in good yields.

关键词： Metal-free hydrosilylation Reduction Ketone Ketimine

Boundary Conditions for Combustion Field and LB Simulation of Diesel Particulate Filter

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Communications in Computational Physics 2013年第3期13卷 769-779页

作者： kazuhiro Yamamoto Department of Mechanical Science and Engineering Faculty of EngineeringNagoya UniversityFuro-choChikusa-kuNagoya464-8603 Japan

A diesel particulate filter(DPF)is a key technology to meet future emission standards of particulate matters(PM),mainly *** is generally consists of a wall-flow type filter positioned in the exhaust stream of a diesel *** is difficult to simulate the thermal flow in DPF,because we need to consider the soot deposition and combustion in the complex geometry of filter *** our previous study,we proposed an approach for the conjugate simulation of gas-solid *** is,the gas phase was simulated by the lattice Boltzmann method(LBM),coupled with the equation of heat conduction inside the solid filter ***,its numerical procedure was slightly *** this study,to reduce numerical costs,we have tested a new boundary condition with chemical equilibrium in soot combustion at the surface of filter *** on the soot oxidation rate with catalysts evaluated in experiments,the lattice Boltzmann simulation of soot combustion in the catalyzed DPF is firstly presented to consider the process in the after-treatment of diesel exhaust *** heat and mass transfer is shown to discuss the effect of catalysts.

关键词： Lattice Boltzmann method DPF heat conduction X-ray CT multiphase flow

Enzymatic synthesis of bioactive compounds by Rhus laccase from Chinese Rhus vernicifera

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Science China Chemistry 2007年第2期50卷 179-182页

作者： AKIYAMA kazuhiro MIYAKOSHI Tetsuo Department of Industrial Chemistry School of Science and TechnologyMeiji UniversityHigashi-mitaTama-kuKawasaki 214Japan

A simple one step synthesis of pinoresinol and its derivatives-active components of Du-Zhong(Eu-commia ulmoides) -from coniferyl alcohol and p-courmaryl alcohol with higher yields was achieved by Rhus laccases(RL) catalysis in water miscible organic solvents. Biomacromolecules dehydro-genative polymers(DHP) were only synthesized by fungal laccases,not by RL. The structures and the reaction mechanism were discussed to promote the understanding of the function of laccases in the process of lignin biosynthesis.

关键词： lignan laccases pinoresinol dehydrogenative polymers enzymatic mechanism

Superiority of urgent vs early endoscopic hemostasis in patients with upper gastrointestinal bleeding with high-risk stigmata

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Gastroenterology Report 2021年第6期9卷 543-551页

作者： Masayasu Horibe Eisuke Iwasaki Juntaro Matsuzaki Fateh Bazerbachi Tetsuji Kaneko kazuhiro Minami Seiichiro Fukuhara Tatsuhiro Masaoka Naoki Hosoe Yuki Ogura Shin Namiki Yasuo Hosoda Haruhiko ogata Takanori Kanai Division of Gastroenterology and Hepatology Department of Internal MedicineKeio University School of MedicineTokyoJapan Division of Gastroenterology and Hepatology Mayo ClinicMNUSA Interventional Endoscopy Program CentraCareSt Cloud HospitalMNUSA Department of Clinical Trial Tokyo Metropolitan Children’s Medical CenterTokyoJapan Teikyo Academic Research Center Teikyo UniversityTokyoJapan Center for Diagnostic and Therapeutic Endoscopy Keio University HospitalTokyoJapan Department of Gastroenterology and Hepatology Tokyo Metropolitan Tama Medical CenterTokyoJapan Division of Gastroenterology Department of Internal MedicineNational Hospital Organization Saitama National HospitalSaitamaJapan

Background Guidelines recommend that all patients with upper gastrointestinal bleeding(UGIB)undergo endoscopy within 24 *** is unclear whether a subgroup may benefit from an urgent *** aimed to evaluate the influence of endoscopic hemostasis and urgent endoscopy on mortality in UGIB patients with high-risk stigmata(HRS).Methods Consecutive patients with suspected UGIB were enrolled in three Japanese hospitals with a policy to perform endoscopy within 24 *** primary outcome was 30-day *** hemostasis and endoscopy timing(urgent,6h;early,>6h)were evaluated in a regression model adjusting for age,systolic pressure,heart rate,hemoglobin,creatinine,and variceal bleeding in multivariate analysis.A propensity score of 1:1 matched sensitivity analysis was also *** HRS were present in 886 of 1966 patients,and 35 of 886(3.95%)patients *** urgent-endoscopy time(n=769)was 3.0h(interquartile range[IQR],2.0–4.0 h)and early endoscopy(n紏117)was 12.0h(IQR,8.5–19.0 h).Successful endoscopic hemostasis and urgent endoscopy were significantly associated with reduced mortality in multivariable analysis(odds ratio[OR],0.22;95%confidence interval[CI],0.09–0.52;P=0.0006,and OR,0.37;95%CI,0.16–0.87;P=0.023,respectively).In a propensity-score-matched analysis of 115 pairs,adjusted comparisons showed significantly lower mortality of urgent vs early endoscopy(2.61%vs 7.83%,P<0.001).Conclusions A subgroup of UGIB patients,namely those harboring HRS,may benefit from endoscopic hemostasis and urgent endoscopy rather than early endoscopy in reducing *** triage scores that predict the presence of such lesions is important.

关键词： UGIB urgent endoscopy non-variceal bleeding variceal bleeding HARBINGER GBS upper gastrointestinal bleeding

Single and multiple optical switches that use freestanding silicon nanowire waveguide couplers

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Light(Science & Applications) 2012年第1期1卷 92-99页

作者： Yuta Akihama kazuhiro Hane Department of Nanomechanics Tohoku UniversitySendai 980-0952Japan

Silicon photonic devices consisting of nanowire waveguides are a promising technology for on-chip integration in future optical telecommunication and interconnection systems based on silicon-large scale integration ***,the accommodation of variable optical components on a chip remains challenging due to the small size of *** this study,we investigated the characteristics of a microelectromechanical silicon nanowire waveguide switch with a gap-variable *** to its capacitive operation,the proposed waveguide switch consumed negligible power relative to switches that use a thermo-optical effect and carrier *** proposed switch was characterized using analyses based on coupled-mode theory for rectangular waveguides,as well as a simulation using the finite difference time domain method.A 2×2 single switch with an improved configuration and a 2×6 multiple switch composed of the 2×2 switches was designed and fabricated by a combination of electron beam lithography,fast-atom beam etching and hydrofluoric acid vapor sacrificial *** properties of the switches were measured and evaluated at a wavelength of 1.55 μm.

关键词： microelectromechanical systems optical switch silicon photonics

Aluminum Electroplating on AZ31 Magnesium Alloy with Acetic Anhydride Pretreatment

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 1996-2006页

作者： Zelei Zhang Atsushi Kitada kazuhiro Fukami Kuniaki Murase Department of Materials Science and Engineering Kyoto UniversityKyoto 606-8501Japan Department of Chemical System Engineering The University of TokyoTokyo 113-8656Japan

Magnesium(Mg)alloys for metal electroplating require a surface pretreatment,i.e.,the removal of the spontaneously oxidized surface layer(MgO,Mg(OH)_(2),andMgCO_(3)).However,the use of highly toxic and/or corrosive acids in conventional pretreatment processes has become an *** this study,a facile and less toxic pretreatment is demonstrated and applied in aluminum(Al)*** immersion of the AZ31 Mg alloy into acetic anhydride(Ac_(2)O)removed the spontaneously oxidized surface layer and formed a thin but stable magnesium acetate(Mg(OAc)_(2))layer that protects the metal substrate from further *** Al electroplating bath is a concentrated diglyme(G2)-AlCl_(3)organic solution that can readily dissolve Mg(OAc)_(2)to enable direct plating onto a metal *** as-deposited Al layer has a compact and crack-free morphology that improves the corrosion resistance and hardness(2.7 GPa).Owing to the lack of an interfacial oxidized layer,heat treatment led to the successful diff usion of Mg and Al atoms,which increased the hardness to 4.4 *** Ac_(2)O pretreatment of Mg alloys enables the successful Al electroplating and subsequent heat treatment.

关键词： Magnesium alloy Surface modifi cation Electrodeposition Hardness Corrosion resistance