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Astrodynamics 2020年第2期4卷 89-103页

作者： Naoko ogawa Fuyuto Terui Yuya Mimasu Kent Yoshikawa Go Ono seiji Yasuda Kota Matsushima Tetsuya Masuda Hiroki Hihara Junpei Sano Takashi Matsuhisa Satoshi Danno Manabu Yamada Yasuhiro Yokota Yuto Takei Takanao Saiki Yuichi Tsuda Japan Aerospace Exploration Agency Sagamihara252-5210Japan NEC Corporation Fuchu183-8501Japan NEC Space Technologies Ltd.Fuchu183-8551Japan Systems Engineering Consultants Co. Ltd.Tokyo158-0097Japan Planetary Exploration Research Center Chiba Institute of TechnologyNarashino275-0016Japan

Hayabusa2 is an asteroid sample return mission carried out by the Japan Aerospace Exploration *** spacecraft was launched in 2014 and arrived at the target asteroid Ryugu on June 27,*** the 1.5-year proximity phase,several critical operations(including two landing/sampling operations)were successfully *** were based on autonomous image-based descent and landing *** paper describes an imagebased autonomous navigation scheme of the Hayabusa2 mission using artificial landmarks named target markers(TMs).Its basic algorithm,and the in-flight results of the first touchdown and its rehearsal,are shown.

关键词： Hayabusa2 Ryugu image-based navigation target marker tracking

Aerodynamic Study on Supersonic Flows in High-Velocity Oxy-Fuel Thermal Spray Process

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Journal of Thermal Science 2005年第2期14卷 126-129页

作者： Hiroshi KATANODA Takeshi MATSUOKA seiji KURODA Jin KAWAKITA Hirotaka FUKANUMA Kazuyasu MATSUO The University of Kitakyushu 1-1 Hibikino Wakamatsu-kuKitakyushuFukuoka808-0135 JapanTakagi Precision Dies Co. Ltd.2-4-1 IshidaminamiKokuraminami-kuKitakyushuFukuoka802-0836 JapanNational Institute for Materials Science 1-2-1SengenTsukubaIbaraki305-0047 JapanNational Institute for Materials Science 1-2-1SengenTsukubaIbaraki305-0047 JapanPlasma Giken Co. Ltd.2-1-12BijogiTodaSaitama335-0031 JapanThe University of Kitakyushu 1-1 HibikinoWakamatsu-kuKitakyushuFukuoka808-0135 Japan

To clarify the characteristics of gas flow in high velocity oxy-fuel (HVOF) thermal spray gun, aerodynamic research is performed using a special gun. The gun has rectangular cross-sectional area and sidewalls of optical glass to visualize the internal flow. The gun consists of a supersonic nozzle with the design Mach number of 2.0 followed by a straight passage called barrel. Compressed dry air up to 0.78 MPa is used as a process gas instead of combustion gas which is used in a commercial HVOF gun. The high-speed gas flows with shock waves in the gun and jets are visualized by schlieren technique. Complicated internal and external flow-fields containing various types of shock wave as well as expansion wave are visualized.

关键词：超声流冲击波热喷涂内流热处理

Estrogen and oxytocin involvement in social preference in male mice:a study using a novel long-term social preference paradigm with aromatase,estrogen receptor-αand estrogen receptor-β,oxytocin,and oxytocin receptor knockout male mice

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Integrative Zoology 2018年第6期13卷 698-710页

作者： Mumeko C.TSUDA Kazuyo NAGATA Shoko SAGOSHI Sonoko ogawa Laboratory of Behavioral Neuroendocrinology University of TsukubaTsukubaIbarakiJapan

Certain aspects of social behavior help animals make adaptive decisions during encounters with other *** mice choose to approach another conspecific,the motivation and preference behind the interaction is not well *** and oxytocin are known to influence a wide array of social behaviors,including social motivation and social *** present study investigated the effects of estrogen and oxytocin on social preference using aromatase(ArKO),estrogen receptor(ER)α(αERKO),ERβ(βERKO),oxytocin(OTKO),oxytocin receptor(OTRKO)knockout and their respective wild-type(WT)male *** were presented with gonadally-intact versus castrated male(IC),intact male versus ovariectomized female(IF),or intact male versus empty cage(IE)stimuli sets for 5 *** showed no preference for either stimuli in IC and IF and intact male preference in IE,but ArKO mice preferred a castrated male or an ovariectomized female,or had no preference for either stimulus in IC,IF and IE stimuli sets,respectively,suggesting reduced intact male preference.αandβWT mice preferred a castrated male,showed no preference,and preferred an intact male in IC,IF and IE,respectively.αERKO mice displayed similar modified social preference patterns as ArKO,whereas the social preference ofβERKO mice remained similar toβ*** preferred a castrated male whereas OTKO,OTRWT and OTRKO mice failed to show any preference in IC and none showed preference for either stimuli in ***,these findings suggest that estrogen regulates social preference in male mice and that impaired social preference in oxytocin-deficient mice may be due to severe deficits in social recognition.

关键词： aromatase estrogen receptor oxytocin receptor social motivation social preference

Quantification of intermuscular and intramuscular adipose tissue using magnetic resonance imaging after neurodegenerative disorders

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Neural Regeneration Research 2017年第12期12卷 2100-2105页

作者： Madoka ogawa Robert Lester Hiroshi Akima Ashraf S.Gorgey Graduate School of Education & Human Development Nagoya University Nagoya Japan Japan Society for Promotion of Science Tokyo Japan Spinal Cord Injury and Disorders Center Hunter Holmes McGuire VAMC Richmond VA USA Research Center of Health Physical Fitness and Sports Nagoya University Nagoya Japan Department of Physical Medicine and Rehabilitation Virginia Commonwealth University Richmond VA USA

Ectopic adiposity has gained considerable attention because of its tight association with metabolic and cardiovascular health in persons with spinal cord injury（SCI）. Ectopic adiposity is characterized by the storage of adipose tissue in non-subcutaneous sites. Magnetic resonance imaging（MRI） has proven to be an effective tool in quantifying ectopic adiposity and provides the opportunity to measure different adipose depots including intermuscular adipose tissue（IMAT） and intramuscular adipose tissue（Intra MAT） or intramuscular fat（IMF）. It is highly important to distinguish and clearly define these compartments, because controversy still exists on how to accurately quantify these adipose depots. Investigators have relied on separating muscle from fat pixels based on their characteristic signal intensities. A common technique is plotting a threshold histogram that clearly separates between muscle and fat peaks. The cut-offs to separate between muscle and fat peaks are still not clearly defined and different cut-offs have been identified. This review will outline and compare the Midpoint and Otsu techniques, two methods used to determine the threshold between muscle and fat pixels on T1 weighted MRI. The process of water/fat segmentation using the Dixon method will also be outlined. We are hopeful that this review will trigger more research towards accurately quantifying ectopic adiposity due to its high relevance to cardiometabolic health after SCI.

关键词： intermuscular adipose tissue intramuscular adipose tissue intramuscular fat ectopic adiposity magnetic resonance imaging

Chronic atrophic gastritis detection with a convolutional neural network considering stomach regions

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World Journal of Gastroenterology 2020年第25期26卷 3650-3659页

作者： Misaki Kanai Ren Togo Takahiro ogawa Miki Haseyama Graduate School of Information Science and Technology Hokkaido UniversitySapporo 0600814HokkaidoJapan Education and Research Center for Mathematical and Data Science Hokkaido UniversitySapporo 0600812HokkaidoJapan Faculty of Information Science and Technology Hokkaido UniversitySapporo 0600814HokkaidoJapan

BACKGROUND The risk of gastric cancer increases in patients with Helicobacter pylori-associated chronic atrophic gastritis(CAG).X-ray examination can evaluate the condition of the stomach,and it can be used for gastric cancer mass ***,skilled doctors for interpretation of X-ray examination are decreasing due to the diverse of *** To evaluate the effectiveness of stomach regions that are automatically estimated by a deep learning-based model for CAG *** We used 815 gastric X-ray images(GXIs)obtained from 815 *** ground truth of this study was the diagnostic results in X-ray and endoscopic *** a part of GXIs for training,the stomach regions are manually annotated.A model for automatic estimation of the stomach regions is trained with the *** the rest of them,the stomach regions are automatically ***,a model for automatic CAG detection is trained with all GXIs for *** In the case that the stomach regions were manually annotated for only 10 GXIs and 30 GXIs,the harmonic mean of sensitivity and specificity of CAG detection were 0.955±0.002 and 0.963±0.004,*** By estimating stomach regions automatically,our method contributes to the reduction of the workload of manual annotation and the accurate detection of the CAG.

关键词： Gastric cancer risk Chronic atrophic gastritis Helicobacter pylori Gastric Xray images Deep learning Convolutional neural network Computer-aided diagnosis

Formation mechanism of extension fractures induced by excavation of a gallery in soft sedimentary rock,Horonobe area,Northern Japan

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Geoscience Frontiers 2013年第1期4卷 105-111页

作者： Tetsuya Tokiwa Kimikazu Tsusaka Makoto Matsubara Taiki Ishikawa Daisuke ogawa Horonobe Underground Research Unit Japan Atomic Energy AgencyHokkaido 098-3224Japan Geoscience Research Laboratory Kanagawa 242-0014Japan Mitsubishi Materials Techno Corporation Tokyo 102-8205Japan

This paper focuses on the formation mechanism of fractures induced by excavation of a gallery in soft sedimentary rocks in the Horonobe area of Japan. Detailed fracture mapping of the gallery indicates that the fractures consist of both pre-existing shear fractures and excavation damaged zone （EDZ） fractures. EDZ fractures correspond to weak planes associated with bedding planes or transgranular cracks. The EDZ fractures terminate against pre-existing shear fractures. Therefore, even for excavations in soft sedimentary rocks, formation of the EDZ fractures are controlled by pre-existing fractures and earlier weak planes.

关键词： Fracture Excavation damaged zone (EDZ)Weak plane Soft rock Excavation

Applications of image analysis in plant chromosome and chromatin structure study

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Quantitative Biology 2022年第3期10卷 226-238页

作者： Nobuko Ohmido Astari Dwiranti seiji Kato Kiichi Fukui Graduate School of Human Development and Environment Kobe UniversityKobe 657-8501Japan Cellular and Molecular Mechanisms in Biological System(CEMBIOS)Research Group Department of BiologyFaculty of Mathematics and Natural SciencesUniversitas IndonesiaDepok CampusWest Java 16424Indonesia Graduate School of Pharmaceutical Sciences Osaka UniversitySuitaOsaka 565-0871Japan

Background:The use of image analysis to understand the structure of chromosome and chromatin is critical to the study of genetic evolution and ***,a detailed chromosome map and the structure of chromatin in the nucleus may contribute to the plant breeding and the study of fundamental biology and genetics in ***:In plants with a fully annotated genome project,such as the Leguminosae species,the integration of genetic information,including DNA sequence data,a linkage map,and the cytological quantitative chromosome map could further improve their genetic *** numerical parameters of chromocenters in 3D can provide useful genetic information for phylogenetic studies of plant diversity and heterochromatic markers whose epigenetic changes may explain the developmental and environmental changes in the plant *** DNA fibers combined with fluorescence in situ hybridization revealed the highest spatial resolution of the obtained genome ***,image analysis at the nano-scale level using a helium ion microscope revealed the surface structure of chromatin,which consists of chromatin fibers compacted into plant ***:The studies described in this review sought to measure and evaluate chromosome and chromatin using the image analysis method,which may reduce measurement time and improve ***,we discussed the development of an effective image analysis to evaluate the structure of chromosome and *** effective application study of cell biology and the genetics of plants using image analysis methods is expected to be a major propeller in the development of new applications.

关键词： CHIAS chromosome chromatin extended DNA fiber helium ion microscopy nucleus plants

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

Sediment organic matter source estimation and ecological classification in the semi-enclosed Batan Bay Estuary, Philippines

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International Journal of Sediment Research 2021年第1期36卷 110-119页

作者： Yuya ogawa Yuki Okamoto Resurreccion Bitoon Sadaba Mamoru Kanzaki Graduate School of Agriculture Kyoto University 2. Graduate School of Global Environmental Studies Kyoto University Division of Biological Sciences University of the Philippines Visayas

The large organic matter flow in tropical coastal areas is recognized as an important process in the global carbon(C) ***,the nature of organic matter flow in semi-enclosed tropical estuaries remains unclear due to the various environmental processes(tidal change,river flow,waves from the sea,and internal circulation) and organic matter sources ***,sediment organic matter(SOM) sources,and their distribution pattern,are key to understanding ecosystem material *** research in the Batan Bay Estuary,Philippines,a semi-enclosed estuary under large mangrove deforestation,was conducted to determine ecosystem properties through analysis of C and nitrogen stable isotope ratios and environmental ***,we determined that mangrove litter,microphytobenthos,and phytoplankton are the main SOM sources in the Batan Bay ***,the estuary was classified into three ecological zones(the Bay zone,Back-barrier zone,and River zone).In addition,we estimated SOM source ratios using the Stable Isotope Analysis in R package and determined different organic matter sources in different *** high ratios of mangrove litter as SOM indicate that a large amount of terrestrial plant organic matter remains despite the heavy mangrove deforestation that has occurred since the 1980 s,and that the Back-barrier zone consists of a different type of ecosystem that promotes accumulation of C from mangrove litter and micro phytobenthos.

关键词： Mangrove Sediment organic matter Stable isotope Carbon Nitrogen SIAR

Impact of particle size of pulverized citrus peel tissue on changes in antioxidant properties of digested fluids during simulated in vitro digestion

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Food Science and Human Wellness 2020年第1期9卷 58-63页

作者： Yidi Cai Wei Qin Sunantha Ketnawa Yukiharu ogawa Graduate School of Horticulture Chiba University648 MatsudoMatsudo 271-8510Japan

To examine the effect of mechanical processing for plant-based materials on antioxidant properties during digestion,relationships between the size of pulverized plant tissue and changes in antioxidant activities during simulated in vitro digestion were *** citrus peel tissue was pulverized and classified into four powder fractions followed their particle size distributions as 125−180m,180−355m,355−500m and 500−710*** fractions were regarded as a plant tissue model with various degrees of cell *** samples were collected during the digestion and measured their particle sizes and ***,total phenolic content and antioxidant activities of digested fluid were also *** results showed that the powder color of smaller particles were significantly changed than the bigger *** bio-properties of digested fluid for the bigger particle sizes comparatively retained more than smaller ones at the simulated gastric *** also showed mostly stable during simulated gastric or small intestinal digestion *** suggested that the release of bioactive compounds from plant tissues during digestion could be related to their structural attributes such as degrees of cell damages which could be affected by processing methods and conditions.

关键词： Plant-based food Tissue structure Antioxidant activity Simulated in vitro digestion Cell matrix