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Proposal of Rip-up &Re-allocate Algorithm for Optical Layer-2 Switch Network

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光子学报 2014年第7期43卷 34-41页

作者： masahiro NAKAGAWA Kyota HATTORI Naoki KIMISHIMA Masaru KATAYAMA Akira MISAWA NTT Network Service Systems Laboratories NTT Corporation

We are developing an optical layer-2s witch network that uses both wavelength-division multiplexing and time-division multiplexing technologies for efficient traffic aggregation in metro *** efficient traffic aggregation,path bandwidth control is key because it strongly affects bandwidth *** this paper,we propose a dynamic time-slot allocation method that uses periodic information of difference values of traffic *** method can derive near-optimal allocation with lower computational cost,which enlarges the maximum available network size compared with conventional time-slot allocation *** results show that the proposed method enables dynamic path control in 1K-node-scale optical layer-2s witch network,which leads to cost-effective metro networks.

关键词：交通聚集技术地铁网络成本效益交通管理

Development of Bio-cultured Artificial Muscles with High Design Flexibility

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Journal of Bionic Engineering 2023年第4期20卷 1635-1645页

作者： Hirono Ohashi Shunsuke Shigaki Ryo Teramae masahiro Shimizu Koh Hosoda Department of Systems Innovation Osaka University1-2MachikaneyamaToyonakaOsaka560-0043Japan

Recent advances in bionics have made it possible to create various tissue and *** this cell culture technology,engineers have developed a robot driven by three-dimensional cultured muscle cells(bioactuator)—a muscle cell *** more applications,researchers have been developed various tissues and organs with bio3D ***,three-dimensional cultured muscle cells printed by bio3D printer have been not used for muscle cell robot *** aim of our study is to develop easy fabrication method of bioactuator having high design flexibility like as bio3D *** fabricated three-dimensional cultured muscle cells using mold and dish having pin which can contribute to shape and cell *** this study,we observed that our method maintained the shape of three-dimensional cultured muscle cells and caused cell alignment which is important for bioactuator *** named three-dimensional cultured muscle cells developed in this study“bio-cultured artificial muscle(BiCAM)”.Finally,we observed that BiCAM contracted in response to electrical *** these data,we concluded our proposed method is easy fabrication method of bioactuator having high design flexibility.

关键词： Three-dimensional cultured muscle cells Bio-cultured artificial muscle Skeletal muscle cell Tissue engineering

Behaviors of Spherical and Nonspherical Particles in a Square Pipe Flow

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Communications in Computational Physics 2011年第5期9卷 1179-1192页

作者： Takaji Inamuro Hirofumi Hayashi masahiro Koshiyama Department of Aeronautics and Astronautics Graduate School of EngineeringKyoto UniversityKyoto 606-8501Japan Advanced Research Institute of Fluid Science and Engineering Graduate School of EngineeringKyoto UniversityKyoto 606-8501Japan

The lattice Boltzmann method(LBM)for multicomponent immiscible fluids is applied to the simulations of solid-fluid mixture flows including spherical or nonspherical particles in a square pipe at Reynolds numbers of about 100.A spherical solid particle is modeled by a droplet with strong interfacial tension and large viscosity,and consequently there is no need to track the moving solid-liquid boundary ***(discoid,flat discoid,and biconcave discoid)solid particles are made by applying artificial forces to the spherical *** is found that the spherical particle moves straightly along a stable position between the wall and the center of the pipe(the Segr´e-Silberberg effect).On the other hand,the biconcave discoid particle moves along a periodic helical path around the center of the pipe with changing its orientation,and the radius of the helical path and the polar angle of the orientation increase as the hollow of the concave becomes large.

关键词： Lattice Boltzmann method square pipe flow spherical particle biconcave discoid particle

Efficacy and safety of emergency endoscopic retrograde cholangiopancreatography for acute cholangitis in the elderly

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World Journal of Gastroenterology 2016年第37期22卷 8382-8388页

作者： Gen Tohda masahiro Ohtani Masaki Dochin Department of Gastroenterology Fukui Kosei Hospital Fukui Fukui 918-8537 Japan Second Department of Internal Medicine Faculty of Medical SciencesUniversity of Fukui Eiheji-cho Fukui 910-1193 Japan

AIM To investigate the efficacy and safety of emergency endoscopic retrograde cholangiopancreatography(ERCP) in elderly patients with acute cholangitis. METHODS From June 2008 to May 2016, emergency ERCPs were performed in 207 cases of acute cholangitis at our institution. Patients were classified as elderly if they were aged 80 years and older(n = 102); controls were under the age of 80 years(n = 105). The patients' medical records were retrospectively reviewed for comorbidities, laboratory data, etiology of cholangitis(presence of biliary stones, biliary stricture and malignancy), details of the ERCP(therapeutic approaches, technical success rates, procedure duration), ERCP-related complications and mortality. RESULTS The frequency of comorbidities was higher in the elderly group than the control group(91.2% vs 67.6%). Periampullary diverticulum was observed in the elderly group at a higher frequency than the control group(24.5% vs 13.3%). Between the groups, there was no significant difference in the technical success rates(95.1% vs 95.2%) or endoscopicprocedure durations. With regard to the frequency of ERCP-related complications, there was no significant difference between the two groups(6.9% vs 6.7%), except for a lower rate of post-ERCP pancreatitis in the elderly group than in the control group(1.0% vs 3.8%). Neither angiographic nor surgical intervention was required in any of the cases with ERCP-related complications. There was no mortality during the observational periods. CONCLUSION Emergency ERCP for acute cholangitis can be performed safely even in elderly patients aged 80 years and older.

关键词： Acute cholangitis Endoscopic retrograde cholangiopancreatography Complication Comorbidity Elderly

Semisolid casting with ultrasonically melt-treated billets of Al-7mass%Si alloys

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China Foundry 2012年第1期9卷 78-83页

作者： Yoshiki Tsunekawa masahiro Okumiya Takahiro Motomura Toyota Technological Institute

Abstract： The demand for high performance cast aluminum alloy components is often disturbed by increasing impurity elements, such as iron accumulated from recycled scraps. It is strongly required that coarse plate-like iron compound of β-Al5FeSi turns into harmless form without the need for applying refining additives or expensive virgin ingots. The microstructural modification of Al-7mass%Si alloy billets with different iron contents was examined by applying ultrasonic vibration during the solidification. Ultrasonically melt-treated billets were thixocast right after induction heating up to the semisolid temperature of 583 ℃, the microstructure and tensile properties were evaluated in the thixocast components. Globular primary reAl is required to fill up a thin cavity in thixocasting, so that the microstructural modification by ultrasonic melt-treatment was firstly confirmed in the billets. With ultrasonic melt-treatment in the temperature range of 630 ℃ to 605 ℃, the primary α-AI transforms itself from dendrite into fine globular in morphology. The coarse plate-like β-AIsFeSi compound becomes markedly finer compared with those in non-treated billets. Semisolid soaking up to 583 ℃, does not appreciably affect the size of β-AIsFeSi compounds; however, it affects the solid primary reAl morphology to be more globular, which is convenient for thixocasting. After thixocasting with preheated billets, eutectic silicon plates are extremely refined due to the rapid solidification arising from low casting temperature. The tensile strength of thixocast samples with different iron contents does not change much even at 2mass% of iron, when thixocast with ultrasonically melt-treated billets. However, thixocast AI-7mass%Si-2mass%Fe alloy with non-treated billets exhibits an inferior strength of 80 MPa, compared with 180 MPa with ultrasonically melt-treated billets. The elongation is also improved by about a factor of two in thixocastings with ultrasonically melt-treated billets

关键词： cast Al-Si alloy ultrasonic radiation thixocasting α-Al iron compound

Efficacy of cytapheresis in patients with ulcerative colitis showing insufficient or lost response to biologic therapy

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World Journal of Gastroenterology 2022年第34期28卷 4959-4972页

作者： masahiro Iizuka Takeshi Etou Shiho Sagara Akita Health Care Center Akita Red Cross HospitalAkita 010-0001Japan Department of Gastroenterology Akita Red Cross HospitalAkita 010-1495Japan

For the optimal management of refractory ulcerative colitis(UC),secondary loss of response(LOR)and primary non-response to biologics is a critical *** article aimed to summarize the current literature on the use of cytapheresis(CAP)in patients with UC showing a poor response or LOR to biologics and discuss its advantages and ***,we summarized the efficacy of CAP in patients with UC showing insufficient response to thiopurines or immunomodulators(IM).Eight studies evaluated the efficacy of CAP in patients with UC with inadequate responses to thiopurines or *** were no significant differences in the rate of remission and steroid-free remission between patients exposed or not exposed to thiopurines or *** studies evaluated the efficacy of CAP in patients with UC showing an insufficient response to biologic *** remission rates of biologics exposed or unexposed patients were 29.4%and 44.2%,*** studies evaluated the efficacy of CAP in combination with biologics in patients with inflammatory bowel disease showing a poor response or LOR to *** rates of remission/response and steroid-free remission in patients with UC ranged 32%-69%(mean:48.0%,median:42.9%)and 9%-75%(mean:40.7%,median:38%),*** had the same effectiveness for remission induction with or without prior failure on thiopurines or IM but showed little benefit in patients with UC refractory to *** heterogeneity existed in the efficacy of the combination therapy with CAP and biologics,these combination therapies induced clinical remission/response and steroid-free remission in more than 40%of patients with UC refractory to biologics on *** the excellent safety profile of CAP,this combination therapy can be an alternative therapeutic strategy for UC refractory to *** prospective studies are needed to understand the efficacy of combination therapy with CAP and biologics.

关键词： Ulcerative colitis Inflammatory bowel disease Cytapheresis Granulocyte and monocyte adsorptive apheresis Anti-tumor necrosis factor-αantibody Combination therapy

Role of microRNAs in gastric cancer

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World Journal of Gastroenterology 2014年第19期20卷 5694-5699页

作者： Hideyuki Ishiguro masahiro Kimura Hiromitsu Takeyama Department of Gastroenterological Surgery Nagoya City University Graduate School of Medical SciencesNagoya 467-8601Japan

Although gastric cancer(GC)is one of the leading causes of cancer-related death,major therapeutic advances have not been made,and patients with GC still face poor *** prognosis of GC also remains poor because the molecular mechanisms of GC progression are incompletely ***(miRNAs)are noncoding RNAs that are associated with gastric *** investigating the regulation of gene expression by miRNAs have made considerable progress in recent years,and abnormalities in miRNA expression have been shown to be associated with the occurrence and progression of *** contribute to gastric carcinogenesis by altering the expression of oncogenes and tumor suppressors,affecting cell proliferation,apoptosis,motility,and ***,a number of miRNAs have been shown to be associated with tumor type,tumor stage,and patient survival and therefore may be developed as novel diagnostic or prognostic *** this review,we discuss the involvement of miRNAs in GC and the mechanisms through which they regulate gene expression and biological ***,we review recent research on the involvement of miRNAs in GC prognosis,their potential use in chemotherapy,and their effects on Helicobacter pylori infections in GC.A greater understanding of the roles of miRNAs in gastric carcinogenesis could provide insights into the mechanisms of tumor development and could help to identify novel therapeutic targets.

关键词： MicroRNA Gastric cancer Reverse transcription-polymerase chain reaction Chemosensitivity Helicobacter pylori Circulating MicroRNA

Rate of hexabromocyclododecane decomposition and production of brominated polycyclic aromatic hydrocarbons during combustion in a pilot-scale incinerator

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Journal of Environmental Sciences 2017年第11期29卷 91-96页

作者： Yuichi Miyake masahiro Tokumura Qi Wang Takashi Amagai Yuichi Horii University of Shizuoka 52-1 Yada Suruga-ku Shizuoka 422-8526 Japan Center for Environmental Science in Saitama 914 Kamitanadare Kazo Saitama 34F-0115 Japan

Here, we examined the incineration of extruded polystyrene containing hexabromocyclododecane（HBCD） in a pilot-scale incinerator under various combustion temperatures（800–950℃） and flue gas residence times（2–8 sec）. Rates of HBCD decomposition ranged from 99.996%（800℃, 2 sec） to 99.9999%（950℃, 8 sec）; the decomposition of HBCD, except during the initial stage of combustion（flue gas residence time 〈 2 sec）, followed a pseudo-first-order kinetics model. An Arrhenius plot revealed that the activation energy and frequency factor of the decomposition of HBCD by combustion were 14.2 kJ/mol and 1.69 sec^（-1）,respectively. During combustion, 11 brominated polycyclic aromatic hydrocarbons（BrPAHs）were detected as unintentional by-products. Of the 11 BrPAHs detected, 2-bromoanthracene and 1-bromopyrene were detected at the highest concentrations. The mutagenic and carcinogenic BrPAHs 1,5-dibromoanthracene and 1-bromopyrene were most frequently detected in the flue gases analyzed. The total concentration of BrPAHs exponentially increased（range,87.8–2,040,000 ng/m^3） with increasing flue gas residence time. Results from a qualitative analysis using gas chromatography/high-resolution mass spectrometry suggest that bromofluorene and bromopyrene（or fluoranthene） congeners were also produced during the combustion.

关键词： Brominated polycyclic aromatic hydrocarbons Flame retardant Hexabromocyclododecane(HBCD) Incinerator Persistent organic pollutants(POPs)

Control of Secondary Flow in a Low Solidity Circular Cascade Diffuser

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Journal of Thermal Science 2012年第4期21卷 384-390页

作者： Daisaku Sakaguchi Takuji Fujii Hironobu Ueki masahiro Ishida Hiroshi Hayami Nagasaki University 1-14 Bunkyo-machi Kyushu University (retired)

According to the previous experimental works on the low solidity circular cascade diffuser (LSD), a pressure recovery of a centrifugal blower was improved by the LSD significantly in a wide range of flow rate, and the pres-sure recovery was improved further by the LSD with a tandem cascade in comparison with the LSD with a sin-gle-row cascade. In the present study, the flow behavior in the LSD with the tandem cascade has been analyzed numerically by using the commercial CFD code of ANSYS-CFX12. It was shown clearly that the higher pressure recovery was achieved by applying the LSD with the tandem cascade, and the high pressure recovery is based on the high pressure rise in the vaneless space upstream of the LSD and the high blade loading of the front blade of the LSD. The high pressure recovery in the LSD could be achieved by controlling the flow separation on the suc-tion surface of the front blade and also on that of the rear blade due to formation of the favorable secondary flow and due to increase in mass flow passing through the slit section between the front and rear blades.

关键词： LSD (Low solidity circular cascade diffuser) Centrifugal blower Range enhancement Tandem cascade