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Nanotechnology and Precision Engineering 2018年第3期1卷 157-171页

作者： Philipp Maas Yuta Mizumoto yasuhiro Kakinuma Sangkee Min Department of System Design Engineering Faculty of Science & TechnologyKeio University Department of Mechanical Engineering University of Wisconsin-Madison

Single-crystal sapphire is utilized as a high-performance engineering material,especially in extreme and harsh ***,due to its extreme hardness and brittleness,the machinability of sapphire is still a *** means of nanoindentation and plunge-cut experiments,the anisotropic brittle-ductile transition of the prismatic M-plane and rhombohedral R-plane is examined by analyzing crack morphologies and the critical depth-of-cut(CDC).The experimental results of the nanoindentation tests are correlated to the plunge-cut *** the prism plane and the rhombohedral crystal plane exhibit a two-fold symmetry of ductility with various crack patterns along the machined *** direction-dependent plasticity of the hexagonal sapphire crystal is mainly connected to a twinning process accompanied by slip dislocation.

关键词： Sapphire Anisotropy Brittle-ductile transition Orthogonal cutting

New methods for the management of gastric varices

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World Journal of Gastroenterology 2006年第37期12卷 5926-5931页

作者： Hiroshi Yoshida yasuhiro Mamada Nobuhiko Taniai Takashi Tajiri Department of Surgery Nippon Medical SchoolTokyo 113-8603 Japan

Bleeding from gastric varices has been successfully treated by endoscopic modalities. Once the bleeding from the gastric varices is stabilized, endoscopic treatment and/or interventional radiology should be performed to eradicate varices completely. Partial splenic artery embolization is a supplemental treatment to prolong the obliteration of the veins feeding and/or draining the varices. The overall incidence of bleeding from gastric varices is lower than that from esophageal varices. No studies to date have defi nitively characterized the causal factors behind bleeding from gastric varices. The initial episodes of bleeding from esophageal varices or gastric varices without prior treatment may be at least partly triggered by a violation of the mucosal barrier overlying varices. This is especially likely in the case of varices of the fundus. In view of the high rate of hemostasis achieved among bleeding gastric varices, treatment should be administered in selective cases. Among untreated cases, steps to prevent gastric mucosal injury confer very important protection against gastric variceal bleeding.

关键词： Gastric varices Esophageal varices Bleeding

Acquisition of hyponymy relations for agricultural terms from a Japanese statutory corpus

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Information Processing in Agriculture 2014年第2期1卷 95-104页

作者： Makoto Nakamura Tomohiro Ohno yasuhiro Ogawa Katsuhiko Toyama Japan Legal Information Institute Graduate School of LawNagoya UniversityFuro-choChikusa-kuNagoya 464-8601Japan Information Technology Center Nagoya UniversityFuro-choChikusa-kuNagoya 464-8601Japan Graduate School of Information Science Nagoya UniversityFuro-choChikusa-kuNagoya 464-8601Japan

This paper,which aims to increment the vocabulary of an existing thesaurus using hyponymy relations,focuses on an agricultural thesaurus called *** main goal is to acquire AGROVOC-qualified candidates from the hyponymy relations of legal texts and *** propose a pattern-based approach to hyponymy relation *** experimental result showed that 222 and 868 candidates are extracted from statutory sentences with 67.1%precision and tables with 37.0%precision,respectively.

关键词： AGROVOC Japanese statutory corpus Legal text processing

A Delayed HIV Infection Model with the Homeostatic Proliferation of CD4^(+)T Cells

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Acta Mathematicae Applicatae Sinica 2022年第2期38卷 441-462页

作者： Qiang-hui XU Ji-cai HUANG Yue-ping DONG yasuhiro TAKEUCHI School of Mathematics and Statistics and Hubei Key Laboratory of Mathematical Sciences Central China Normal UniversityWuhan 430079China College of Science and Engineering Aoyama Gakuin UniversityKanagawa 252-5258Japan

In this paper,we investigate a delayed HIV infection model that considers the homeostatic prolif-eration of CD4^(+)T *** existence and stability of uninfected equilibrium and infected equilibria(smaller and larger ones)are studied by analyzing the characteristic equation of the *** intracellular delay does not affect the stability of uninfected equilibrium,but it can change the stability of larger positive equilibrium and Hopf bifurcation appears inducing stable limit ***,direction and stability of Hopf bifur-cation are well investigated by using the central manifold theorem and the normal form *** numerical simulation results show that the stability region of larger positive equilibrium becomes smaller as the increase of time ***,when the maximum homeostatic growth rate is very small,the larger positive equilibrium is always *** the contrary,when the rate of supply of T cells is very small,the larger positive equilibrium is always unstable.

关键词： HIV infection and persistence T cell homeostatic proliferation delayed model dynamics analysis Hopf bifurcation

Selection of Suitable Maximum-heart-rate Formulas for Use with Karvonen Formula to Calculate Exercise Intensity

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International Journal of Automation and computing 2015年第1期12卷 62-69页

作者： Jinhua She Hitoshi Nakamura Koji Makino yasuhiro Ohyama Hiroshi Hashimoto Graduate School of Bionics Computer and Media Sciences Tokyo University of Technology 1404-1 KatakuraHachioji Tokyo 192-0982 Japan Interdisciplinary Graduate School of Medical and Engineering University of Yamanashi4-3-11 Takeda Kofu 400-8511 Japan Master Program of Innovation for Design and Engineering Advanced Institute of Industrial Technology 1-10-40 HigashiooiShinagawa-ku Tokyo 140-0011 Japan

The Karvonen formula, which is widely used to estimate exercise intensity, contains maximum heart rate, H Rmax, as a variable. This study employed pedaling experiments to assess which of the proposed formulas for calculating H Rmaxwas the most suitable for use with the Karvonen formula. First, two kinds of experiments involving an ergometer were performed: an all-in-one-day experiment that tested eight pedaling loads in one day, and a one-load-per-day experiment that tested one load per day for eight days.A comparison of the data on 7 subjects showed that the all-in-one-day type of experiment was better for assessing H Rmaxformulas,at least for the load levels tested in our experiments. A statistical analysis of the experimental data on 47 subjects showed two of the H Rmaxformulas to be suitable for use in the Karvonen formula to estimate exercise intensity for males in their 20 s. In addition, the physical characteristics of a person having the greatest impact on exercise intensity were determined.

关键词： Borg CR10 scale Karvonen formula exercise intensity maximum heart rate pedaling statistical analysis

Multicolor pattern scan laser for diabetic retinopathy with cataract

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International Journal of Ophthalmology(English edition) 2014年第4期7卷 673-676页

作者： Takao Hirano yasuhiro Iesato Toshinori Murata Department of Ophthalmology Shinshu University School of Medicine

· AIM: To evaluate the ability of various laser wavelengths in delivering sufficient burns to the retina in eyes with cataract using a new multicolor pattern scan laser with green(532 nm), yellow(577 nm), and red(647 nm)lasers.·METHODS: The relationship between the Emery-Little(EL) degree of cataract severity and the laser wavelength required to deliver adequate burns was investigated in102 diabetic eyes. Treatment time, total number of laser shots, and intra-operative pain were assessed as well.·RESULTS: All EL-1 grade eyes and 50% of EL-2 eyes were successfully treated with the green laser, while 50%of EL-2 eyes, 96% of EL-3 eyes, and 50% of EL-4 eyes required the yellow laser. The red laser was effective in the remaining 4% of EL-3 and 50% of EL-4 eyes.·CONCLUSION: Longer wavelength lasers are more effective in delivering laser burns through cataract when we use a multicolor pattern scan laser system.

关键词： diabetic macular edema photocoagulation retinal hemorrhage pain photoreceptors

Endoscopic papillectomy of minor papillar adenoma associated with pancreas divisum

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World Journal of Gastroenterology 2009年第9期15卷 1138-1140页

作者： Akira Kanamori Takashi Kumada Seiki Kiriyama yasuhiro Sone Makoto Tanikawa yasuhiro Hisanaga Hidenori Toyoda Hiroki Kawashima Akihiro Itoh Yoshiki Hirooka Hidemi Goto Department of Gastroenterology Ogaki Municipal HospitalOgaki 503-8502Japan Department of Gastroenterology Nagoya University Graduate School ofMedicineNagoya 466-8560Japan Department of Gastroenterology Nagoya University Graduate School of MedicineNagoya 466-8560Japan Department of Endoscopy Nagoya University HospitalNagoya 466-8560Japan

Tumors of the minor papilla of the duodenum are quite *** successfully and safely treated an 18-mm adenoma of the minor papilla associated with pancreas divisum using endoscopic papillectomy.A 64-year-old man was admitted to our hospital for treatment of an asymptomatic mass in the minor papilla detected by upper gastrointestinal *** analysis showed an 18-mm,whitish,sessile mass,located in the duodenum proximal to a normal-appearing major *** retrograde pancreatography did not reveal the pancreatic *** resonance cholangiopancreatography showed a lack of the ventral pancreatic *** suspected this case was associated with pancreatic divisum;therefore,we performed endoscopic papillectomy of the minor papilla ***,endoscopic pancreatic stent placement in the minor papilla was done to prevent drainage *** patient has been asymptomatic without recurrence of tumor or stenosis of the Santorini orifice upon endoscopic examination for the past 2 years.

关键词： Endscopic papitlectomy Minor papill aradenoma Pancreas divisum Endoscopic pancreatic stent Endoscopic retrograde pancreatography

Improvement of the physical properties of poly(methyl methacrylate) by copolymerization with N-pentafluorophenyl maleimide; zero-orientational and photoelastic birefringence polymers with high glass transition temperatures

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Science China Chemistry 2012年第5期55卷 850-853页

作者： TAGAYA Akihiro LOU LiPing IDE Yoko KOIKE yasuhiro OKAMOTO Yoshiyuki Keio Photonics Research Institute Keio University E-building Shin-Kawasaki Town Campus 7-1 Shin-Kawasaki Saiwai-ku Kawasaki 212-0032 Japan Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan Polymer Research Institute Polytechnic Institute of NYU 6 MetroTech Center Brooklyn New York 11201 USA

Copolymers of N-pentafluorophenyl maleimide (PFPMI) with methyl methacrylate (MMA) were synthesized by a free radical initiator, such as AIBN. The refractive indexes of the copolymers remained nearly constant (1.4970 at 532 nm) regardless of the polymer composition. These copolymers also showed high thermal stability. The orientational and photoelastic birefringence of the copolymers obtained were measured. Since both of the orientational and photoelastic birefringences of PMMA are negative whereas poly(PFPMI) exhibits positive, thus we have obtained nearly zero orientational and photoelastic birefringence polymers when the ratios of MMA/PFPMI were 91.8/8.2 and 97.0/3.0 mol%, respectively. Based on the experimental data, the ratios of MMA/PFPMI for zero birefringence were determined to be 88.9/11.1 and 93.8/6.2 mol% for orientational and photoelastic birefringence, respectively. The Tgs of corresponding copolymers were estimated to be 128 and 122 ℃.

关键词： N-pentafluorophenyl maleimide copolymers orientational birefringence photoelastic birefringence

New methods for the management of esophageal varices

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World Journal of Gastroenterology 2007年第11期13卷 1641-1645页

作者： Hiroshi Yoshida yasuhiro Mamada Nobuhiko Taniai Takashi Tajiri Department of Surgery Nippon Medical School Tokyo 1138603 Japan

Bleeding from esophageal varices (EVs) is a catastrophic complication of chronic liver disease. Many years ago, surgical procedures such as esophageal transection or distal splenorenal shunting were the only treatments for EVs. In the 1970s, interventional radiology procedures such as transportal obliteration, left gastric artery embolization, and partial splenic artery embolization were introduced, improving the survival of patients with bleeding EVs. In the 1980s, endoscopic treatment, endoscopic injection sclerotherapy (EIS), and endoscopic variceal ligation (EVL), further contributed to improved survival. We combined IVR with endoscopic treatment or EIS with EVL. Most patients with EVs treated endoscopically required follow- up treatment for recurrent varices. Proper management of recurrent EVs can significantly improve patients’ quality of life. Recently, we have performed EVL at 2-mo (bimonthly) intervals for the management of EVs. Longer intervals between treatment sessions resulted in a higher rate of total eradication and lower rates of recurrence and additional treatment.

关键词： Esophageal varices Surgery Interventional radiology Embolization Endoscopic treatment Bi-rnonthly

Modeling the effect of time delay in budget allocation to control an epidemic through awareness

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International Journal of Biomathematics 2018年第2期11卷 263-282页

作者： A. K. Misra Rajanish Kumar Rai yasuhiro Takeuchi Department of Mathematics Institute of ScienceBanaras Hindu University Varanasi 221 005 India Department of Physics and Mathematics College of Science and Engineering Aoyama Gakuin University Kanagawa 252-5258 Japan

The emergence of any new infectious disease poses much stress on the government to control the spread of such disease. The easy, fast and less expensive way to slow down the spread of disease is to make the population be aware of its spread and possible control mechanisms. For this purpose, government allocates some funds to make public aware through mass media, print media, pamphlets, etc. Keeping this in view, in this paper, a nonlinear mathematical model is proposed and analyzed to assess the effect of time delay in providing funds by the government to warn people. It is assumed that suscep- tible individuals contract infection through the direct contact with infected individuals; however the rate of contracting infection is a decreasing function of funds availability. The proposed model is analyzed using stability theory of delay differential equations and numerical simulations. The model analysis shows that the increase in funds to warn people reduces the number of infected individuals but delay in providing the funds desta- bilizes the interior equilibrium and may cause stability switches.

关键词： Epidemic model economic funds time delay Hopf bifurcation stabilityswitches.