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Undiagnosed Anterior Cranial Fossa Dural Arteriovenous Fistula with Intracranial Hematoma: Case Report and Review of the Literature about Its Natural History

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Open Journal of Modern Neurosurgery 2015年第2期5卷 64-69页

作者： Takashi Yamaguchi Satsuki Miyata toshihiro mashiko Eiju Watanabe Department of Neurosurgery Jichi Medical University Shimotsuke Japan

Dural arteriovenous fistulas (dAVFs) of an anterior cranial fossa are rare. Because of the high risk of intracranial hemorrhage and relatively easy access for direct surgery, aggressive treatment has been recommended. The natural history of anterior cranial fossa dAVFs (ACF dAVFs) is unclear in spite of many reports for the natural history of general dAVFs. To treat ACF dAVFs, direct surgery has traditionally been performed and endovascular surgery has recently been introduced. A 74-year-old man was transferred with severe consciousness disturbance and presented with devastating intracerebral hemorrhage on the CT scan. Digital subtraction angiography revealed the ACF dAVFs with a large venous pouch. The patient received direct surgery, nevertheless he became vegetative state. Later on, a smaller venous pouch was recognized on the CT scan when he had suffered from the thalamic hemorrhage sixteen months before. There are twelve cases including our case which was treated for a certain period and documented in detail. Eleven of twelve cases were asymptomatic. Three of the six cases with a venous pouch had some events possibly related to the disease, though none of the six cases without a venous pouch had any events during observation. In conclusion, an ACF dAVF with a venous pouch should be treated by direct surgery or endovascular surgery even if it is incidentally found. By contrast, careful observation might be a possible therapeutic option for an ACF dAVF without a venous pouch if there is mild reflux flow.

关键词： Dural Arteriovenous Fistula Anterior Cranial Fossa Natural History Venous Pouch Intracranial Hemorrhage

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Quasi-periodic orbits of small solar sails with time-varying attitude around Earth–Moon libration points

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Astrodynamics 2024年第1期8卷 161-174页

作者： toshihiro Chujo Department of Mechanical Engineering School of EngineeringTokyo Institute of TechnologyTokyo152-8550Japan

This paper proposes new quasi-periodic orbits around Earth–Moon collinear libration points using solar *** including the time-varying sail orientation in the linearized equations of motion for the circular restricted three-body problem(CR3BP),four types of quasi-periodic orbits(two types around L1 and two types around L2)were *** them,one type of orbit around L2 realizes a considerably small geometry variation while ensuring visibility from the Earth if(and only if)the sail acceleration due to solar radiation pressure is approximately of a certain magnitude,which is much smaller than that assumed in several previous *** means that only small solar sails can remain in the vicinity of L2 for a long time without propellant *** orbits designed in the linearized CR3BP can be translated into nonlinear CR3BP and high-fidelity ephemeris models without losing geometrical *** this study,new quasi-periodic orbits are formulated,and their characteristics are ***,their extendibility to higher-fidelity dynamic models was verified using numerical examples.

关键词： solar sail libration point orbit Earth-Moon system circular restricted three-body problem(CR3BP)

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Optimization of body configuration and joint-driven attitude stabilization for transformable spacecraft under solar radiation pressure

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Astrodynamics 2024年第1期8卷 47-60页

作者： Yuki Kubo toshihiro Chujo Institute of Space and Astronautical Science Japan Aerospace Exploration AgencyKanagawa252-5210Japan Department of Mechanical Engineering Tokyo Institute of TechnologyTokyo152-8550Japan

The solar sail is one of the most promising space exploration systems due to its theoretically infinite specific impulse achieved through solar radiation pressure(SRP).Recently,researchers have proposed“transformable spacecraft”capable of actively reconfiguring their body configurations using actuatable *** spacecraft,if used similarly to solar sails,are expected to significantly enhance orbit and attitude control capabilities owing to their high redundancy in control degrees of ***,controlling them becomes challenging due to their large number of inputs,leading previous researchers to impose strong constraints to limit their potential control *** study focuses on novel attitude control techniques for transformable spacecraft under *** developed two methods,namely,joint angle optimization to obtain arbitrary SRP force and torque,and momentum damping control driven by joint angle *** proposed methods are formulated in a general manner and can be applied to any transformable spacecraft comprising front faces that can predominantly receive the SRP on each *** validity of our proposed method is confirmed through numerical *** study contributes to making most of the high control redundancy of transformable spacecraft without the need for expendable propellants,thus significantly enhancing the orbit and attitude control capabilities.

关键词： solar sail transformable spacecraft attitude-joint coupled motion attitudestabilization

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Topic highlight on texture and color enhancement imaging in gastrointestinal diseases

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World Journal of Gastroenterology 2024年第14期30卷 1934-1940页

作者： Osamu Toyoshima toshihiro Nishizawa Keisuke Hata Department of Gastroenterology Toyoshima Endoscopy ClinicTokyo 157-0066Japan Department of Gastroenterology and Hepatology International University of Health and WelfareNarita HospitalNarita 286-8520Japan Department of Gastroenterology Nihonbashi Muromachi Mitsui Tower Midtown ClinicTokyo 103-0022Japan

Olympus Corporation developed texture and color enhancement imaging(TXI)as a novel image-enhancing endoscopic *** topic highlights a series of hot-topic articles that investigated the efficacy of TXI for gastrointestinal disease identification in the clinical setting.A randomized controlled trial demonstrated improvements in the colorectal adenoma detection rate(ADR)and the mean number of adenomas per procedure(MAP)of TXI compared with those of white-light imaging(WLI)observation(58.7%vs 42.7%,adjusted relative risk 1.35,95%CI:1.17-1.56;1.36 vs 0.89,adjusted incident risk ratio 1.48,95%CI:1.22-1.80,respectively).A cross-over study also showed that the colorectal MAP and ADR in TXI were higher than those in WLI(1.5 vs 1.0,adjusted odds ratio 1.4,95%CI:1.2-1.6;58.2%vs 46.8%,1.5,1.0-2.3,respectively).A randomized controlled trial demonstrated non-inferiority of TXI to narrow-band imaging in the colorectal mean number of adenomas and sessile serrated lesions per procedure(0.29 vs 0.30,difference for non-inferiority-0.01,95%CI:-0.10 to 0.08).A cohort study found that scoring for ulcerative colitis severity using TXI could predict relapse of ulcerative colitis.A cross-sectional study found that TXI improved the gastric cancer detection rate compared to WLI(0.71%vs 0.29%).A cross-sectional study revealed that the sensitivity and accuracy for active Helicobacter pylori gastritis in TXI were higher than those of WLI(69.2%vs 52.5%and 85.3%vs 78.7%,res-pectively).In conclusion,TXI can improve gastrointestinal lesion detection and qualitative ***,further studies on the efficacy of TXI in clinical practice are required.

关键词： Endoscopy Texture and color enhancement imaging White-light imaging Narrow-band imaging Colorectal neoplasm Gastric cancer Adenoma Ulcerative colitis Helicobacter infections Colonoscopy

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On Exit Time from Balls of Jump-type Symmetric Markov Processes

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Acta Mathematica Sinica,English Series 2010年第1期26卷 185-192页

作者： toshihiro UEMURA Department of Mathematics Faculty of Engineering Science Kansai University

We obtain upper and lower bounds of the exit times from balls of a jump-type symmetric Markov process. The proofs are delivered separately. The upper bounds are obtained by using the Levy system corresponding to the process, while the precise expression of the （L^2-）generator of the Dirichlet form associated with the process is used to obtain the lower bounds.

关键词： symmetric Dirichlet form jump-type Markov process Levy system exit times from balls

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Effect of Exit Geometry of Tail Pipe on the Performance of Pulse Jet Engines

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Journal of Thermal Science 2006年第3期15卷 263-268页

作者： toshihiro NAKANO ShigeruMATSUO KenbuTERAMOTO ToshiakiSETOGUCHI Department of Mechanical Engineering Saga University1 Honjo-machiSaga-shiSaga 840-8502Japan

In this paper,the effect of geometries of tube open end on the shock,compression and expansion wavespropagating in the tube was investigated numerically and *** of them is a conventional straightshock tube with an open *** other has a divergent tail tube at the *** a divergent tail tube(flaretube)to an open end shock tube,the period of one-cycle process could be shortened and the pressure behind theexpansion wave produced at the exit of the shock tube could be lowered much more below the atmosphericpressure than that produced in the straight *** results suggested that the intake air into the engine wassignificantly increased by applying a flare tube instead of a straight tube.

关键词： compressible flow shock wave expansion wave pulse jet numerical simulation

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Landscape gradient of autumn photosynthetic decline in Abies sachalinensis seedlings

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Journal of Forestry Research 2023年第1期34卷 187-195页

作者： Tetsuto Sugai Wataru Ishizuka toshihiro Watanabe Hokkaido Research Center Forestry and Forest Products Research InstituteHitsujigaoka 7Sapporo 062-8516Japan Plant Nutrition Laboratory Research Faculty of AgricultureHokkaido UniversitySapporo 060-8689Japan Forest Research Institute Hokkaido Research OrganizationBibaiHokkaido 079-0198Japan

Understanding what environmental factors are genetically linked to a phenologic al event is critical for predicting responses to climate *** synthetic phenology often varies among a species of evergreen conifers due to local ***,few empirical studies have revealed relevant relationships between climatic factors in provenance environments and photosynthetic *** study evaluated the effects of environmental conditions of the growing site and seed source provenance on the seasonal changes in maximal photochemical quantum yield of photo systemⅡ(Fv/Fm)in a common garden experiment with 2-year-old seedlings of Sakhalin fir(Abies sachalinensis),a representative species with local adaptation,from four seed source provenances.A logistic model was constructed to explain the seasonal variation of Fv/Fmfrom July to October and the relationships between the estimated model parameters and representative factors featuring provenance environments were *** landscape gradient of the detected model parameters responsible for the provenance environments was visualized in a map of the distribution *** lowest temperature was the most plausible factor in the growing environment to explain the seasonal changes of Fv/*** the representative meteorological factors of provenance environments,the lowest temperatures in July showed significant relationships with two model parameters,explaining the lower limit of Fv/Fmand the higher sensitivity of autumn Fv/*** estimated spatial maps of model parameters consistently showed that the higher the lowest temperature in July in the provenance environment,the lower the Fv/Fmin October and the greater the decrease in the autumn Fv/***,the lowest summer temperature could be associated with the local adaptation of autumn photosynthetic phenology in ***.

关键词： Phenology Local adaptation Genetic cline Lowest temperature

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Maintenance and induction of murine embryonic stem cell differentiation using E-cadherin-Fc substrata without colony formation

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Frontiers of Materials Science 2013年第1期7卷 51-61页

作者： Qing-Yuan MENG toshihiro AKAIKE Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Biomolecular Engineering Graduate School of Bioscience and Biotechnnology.Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama 226-8501 Japan

Induced embryonic stem (ES) cells are expected to be promising cell resources for the observation of the cell behaviors in developmental biology as well as the implantation in cell treatments in human diseases. A recombinant E-cadherin substratum was developed as a cell recognizable substratum to maintain the ES cells’ self-renewal and pluripotency at single cell level. Furthermore, the generation of various cell lineages in different germ layers, including hepatic or neural cells, was achieved on the chimeric protein layer precisely and effectively. The induction and isolation of specific cell population was carried out with the enhancing effect of other artificial extracellular matrices (ECMs) in enzyme-free process. The murine ES cell-derived cells showed highly morphological similarities and functional expressions to matured hepatocytes or neural progenitor cells.

关键词： cell adhesion molecule embryonic stemcell differentiation E-cadherin-Fc single cell culture system

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Combined disturbance-observer-based control and iterative learning control design for pulsed superconducting radio frequency cavities

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Nuclear Science and Techniques 2021年第6期32卷 11-22页

作者： Feng Qiu Shinichiro Michizono toshihiro Matsumoto Takako Miura High Energy Accelerator Research Organization 1-1 OhoTsukubaIbaraki 305-0801Japan The Graduate University for Advanced Studies HayamaKanagawa 240-0193Japan Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

The development of iterative learning control combined with disturbance-observer-based(DOB)control for the digital low-level radio frequency(LLRF)system of the International Linear Collider project is *** objective of this study is to compensate for both repetitive(or predictable)and unpredictable disturbances in a radio frequency system(e.g.,beam loading,Lorentz force detuning,and microphonics).The DOB control approach was verified using the LLRF system at the Superconducting Test Facility(STF)at KEK in the absence of a *** method comprising DOB control combined with an iterative learning control algorithm was then demonstrated in a cavity-simulator-based test bench,where a simulated beam was *** results showed that the performance of the LLRF system was improved,as expected by this combined control *** plan to further generalize this approach to LLRF systems at the STF and the future International Linear Collider project.

关键词： Low-level radio frequency Disturbance observer Iterative learning control

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Kyoto classification of gastritis:Advances and future perspectives in endoscopic diagnosis of gastritis

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World Journal of Gastroenterology 2022年第43期28卷 6078-6089页

作者： Osamu Toyoshima toshihiro Nishizawa Department of Gastroenterology Toyoshima Endoscopy ClinicTokyo 157-0066Japan Department of Gastroenterology and Hepatology International University of Medicine and WelfareNarita 286-8520Japan

This editorial provides an update of the recent evidence on the endoscopy-based Kyoto classification of gastritis,clarifying the shortcomings of the Kyoto classification,and providing prospects for future research,with particular focus on the histological subtypes of gastric cancer(GC)and Helicobacter pylori(***)infection *** total Kyoto score is designed to express GC risk on a score ranging from 0 to 8,based on the following five endoscopic findings:Atrophy,intestinal metaplasia(IM),enlarged folds(EF),nodularity,and diffuse redness(DR).The total Kyoto score reflects *** status as follows:0,≥2,and≥4 indicate a normal stomach,***-infected gastritis,and gastritis at risk for GC,*** arrangement of collecting venules(RAC)predicts noninfection;EF,nodularity,and DR predict current infection;map-like redness(MLR)predicts past infection;and atrophy and IM predict current or past ***,IM,and EF all increase the incidence of ***-infected *** is a specific risk factor for ***-eradicated GC,while RAC results in less ***-type GC can be induced by active inflammation,which presents as EF,nodularity,and atrophy on endoscopy,as well as neutrophil and mononuclear cell infiltration on *** contrast,intestinal-type GC develops via atrophy and IM,and is consistent between endoscopy and ***,this GC risk-scoring design needs to be improved.

关键词： Kyoto classification Gastritis Endoscopy Gastric cancer Histology Helicobacter pylori

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