Muroran-IT Academic Resource Archive
Not a member yet
5947 research outputs found
Sort by
Homecare Robotic Systems for Healthcare 4.0: Visions and Enabling Technologies
Get PDFapplication/pdfPowered by the technologies that have originated from manufacturing, the fourth revolution of healthcare technologies is happening (Healthcare 4.0). As an example of such revolution, new generation homecare robotic systems (HRS) based on the cyber-physical systems (CPS) with higher speed and more intelligent execution are emerging. In this article, the new visions and features of the CPS-based HRS are proposed. The latest progress in related enabling technologies is reviewed, including artificial intelligence, sensing fundamentals, materials and machines, cloud computing and communication, as well as motion capture and mapping. Finally, the future perspectives of the CPS-based HRS and the technical challenges faced in each technical area are discussed.journal articl
Fast Networking for Disaster Recovery
Get PDFapplication/pdfContent-Centric Networking (CCN) is now a research hotspot aiming at building up a new network architecture compared with the traditional IP-based, host-centric one. In this paper, after leaning that CCN's content naming and content-based properties make it suitable for fast network organizing in disaster recovery, we propose methods on access point placement and routing to fast connect users in a middle-scale post-disaster scenario model. Our work includes the design of a placement algorithm using graphic union coverage and a CCN routing strategy based on Breadth-First Searching, both extracting the social attributes of user node distribution. We use real-world maps for simulation and carry out comparative analysis with existing Ad Hoc methods under the same experimental conditions. The simulation results show that CCN can bring more efficient routing and robust framework to fulfill the urgent demands of post-disaster recovery.journal articl
DeSVig: Decentralized Swift Vigilance Against Adversarial Attacks in Industrial Artificial Intelligence Systems
Get PDFapplication/pdfIndividually reinforcing the robustness of a single deep learning model only gives limited security guarantees especially when facing adversarial examples. In this article, we propose DeSVig, a decentralized swift vigilance framework to identify adversarial attacks in an industrial artificial intelligence systems (IAISs), which enables IAISs to correct the mistake in a few seconds. The DeSVig is highly decentralized, which improves the effectiveness of recognizing abnormal inputs. We try to overcome the challenges on ultralow latency caused by dynamics in industries using peculiarly designated mobile edge computing and generative adversarial networks. The most important advantage of our work is that it can significantly reduce the failure risks of being deceived by adversarial examples, which is critical for safety-prioritized and delay-sensitive environments. In our experiments, adversarial examples of industrial electronic components are generated by several classical attacking models. Experimental results demonstrate that the DeSVig is more robust, efficient, and scalable than some state-of-art defenses.journal articl
Effects of Chemical Pressure on Rare-Earth Oxide GdNIn0.7Co0.3O3 with Nonmagnetic Element Substitution
Get PDFapplication/pdfWe studied the effects of chemical pressure on Gd1-yRyMn0.7Co0.3O3 (R = nonmagnetic rare-earth element) with y = 0.1, 0.3, and 0.5. The substitution of Gd with La, Y, or Lu in orthorhombic Gd1-yRyMn1-xCoxO3 induced a systematic change in the unit-cell volume. Our results reveal that increasing or decreasing the average ionic radius of the rare-earth element in the compound affects the magnetic ordering temperature T-C. The reduction in the proportion of Gd owing to substitution by nonmagnetic elements weakens the spin reversal effect.journal articl
Sensitivity-Based Structural Optimal Design With Bi-Directional Beam Propagation Method for Photonic Devices in High-Index-Contrast Waveguides
Get PDFapplication/pdfThis paper presents structural optimization based on sensitivity analysis exploiting a bi-directional beam propagation method (Bi-BPM) to design efficiently passive components in high-index-contrast optical waveguides. In this study, the Bi-BPM based on scaled-version Denman-Beavers iteration (S-DBI) with branch-cut technique, and scattering operator formulation (SO-Bi-BPM) is employed to execute stable, accurate wave-propagation analysis. Comparing three computation approaches of sensitivity with respect to design variables, efficient way of sensitivity analysis is revealed when the SO-Bi-BPM is used. The application range of the presented design approach is studied by designing a wavelength filter with waveguide grating, and a polarizer based on 1D photonic crystal (1D-PhC).journal articl
The List of Accent in Idiomatic Osaka Dialect
Get PDF本稿では、大阪弁について取り上げられてきたWeb 上での記事や、田辺聖子氏の『大阪弁ちゃらんぽらん』に出てきた、いかにも大阪弁という語彙のアクセント表記を示すことが主たる目的である。とりあげる語彙は特定の年代に固まっているわけではなく、今はほとんど使っていないであろう「もみない」、世代の境界線がどのあたりにあるのか分からない「しゅんでる」、今の若い人でも使う「シュッとした」など様々な世代の大阪弁が含まれている。また、筆者の世代（1970 年生まれ）は、これまでの先行研究では「若い世代」として扱われているが、既に若い世代ではない。したがって、この世代のアクセントを資料として残しておくことが、今後の通時、共時の大阪弁研究に役立つことを願っている。journal articl
銅管の蟻巣腐食の調査と微分分極法を用いた銅電極の交換電流密度の推定
Get PDF室蘭工業大学Muroran Institute of Technology博士（工学）application/pdf家電製品やコンピュータ、車の電子化などエレクトロニクスの著しい発展や熱交換器の高性能化によって銅材料の用途は増加の一途を辿り、銅腐食の形態も多岐に渡っている。エンジンなどの構成材料を強化するために用いられる銅配合合金もバイオマス化による新たな燃焼形態によって腐食モードが異なる場合が見られる。ここでは銅材料の腐食形態で最近深刻な問題を引き起こしている「蟻巣腐食」を実験的に再現し、そのメカニズムについて考察する。また金属腐食に見られる水素発生反応を、より高精度な微分分極法によって解析し燃料電池などの電極開発に指針を与える基礎データを示した。またバイオマス燃料化の一環として液体燃料とメタンガスを併用する「デュアルフューエルモード」を取り上げ、エンジン燃焼試験を実施して燃焼効率などを測定し、これら燃焼形態が材料に及ぼす腐食の可能性について基礎実験を通して考察した。1. 銅管で最近注目される蟻巣腐食（ANC）のメカニズムはまだ明確には解っていない。我々は銅試料をギ酸銅溶液(103 ppm)に20日間浸漬することによる腐食電位とpH値の変化を測定し、表面観察、断面観察、pH測定、電気化学測定を実施した。これより、Disproportionation反応とComproportionation反応がANCメカニズムの解明のために重要な要因となることを示した。更に分極抵抗曲線によって、ANCは腐食速度の大きい高速反応系であることがわかった。2. 銅電極は、水素発生反応（HER）の有望な電極である。電極の触媒性能の計算にはHERの交換電流密度（i0）が用いられるが一般的なターフェル外挿法（TEM）では、勾配の読み取りが不正確であり、且つ電極表面に発生する物理的な抵抗の評価計算にも問題がある。この点を改良した微分分極法（DPM）を用い、0.5 mol dm-3 H2SO4溶液中の銅電極のHERを測定した。この結果DPMではTEMより高い精度を有すること、誤差要因である物理抵抗を合理的に除去できることから、ターフェルスロープ領域を正確に読み取ることができた。3. 本研究ではバイオ燃料(BDF)、並びにメタンガスとCO2の成分比率を人工的に調整したバイオガス（メタン比率40～100%）をDual Fuel(DF)に見立てて燃焼実験を行い熱発生率、燃焼安定度などの燃焼特性を測定した。実験では低トルク(3.5Nm)から高トルク(24.6Nm)の4条件で負荷を変化させ、回転数1800～2600 rpmの5条件で実施した。この結果、低負荷運転時のDFMにおいて正味熱効率は低下し、バイオディーゼル置換率、バイオガスエネルギー率、燃料消費率は増加した。これよりDFモードではメタンの影響を大きく受けること、バイオガス中の二酸化炭素は正味熱効率を上昇させる効果があることが示された。 全条件において燃焼安定度は1.7-4.89 %の間であり、実用化において許容できる値であった。The high increasing application of copper due to its advantages attract the author to do research on copper. In addition, research about dual fuel mode in a diesel engine also discussed as follows:1. Ant nest corrosion (ANC) had been found and observed on the copper tube in the air conditioner. However, the mechanism of ANC is still unclear explained. In order to understand the mechanism and behavior of the ANC, a research investigation of ANC on the copper tube was conducted in terms of the variables of the corrosion potential and pH value in 103 ppm copper formate solution over 20 days. The surface observation, cross-sectional observation, daily pH measurement, and electrochemical measurements were conducted in this research. By using all these results, the author explains the mechanisms of the ANC. It was found that Cannizzaro and Comproportionation reaction critically influenced the ANC mechanism. 2. The copper electrode is still a promising electrode in the hydrogen evolution reaction (HER). The Tafel extrapolation method (TEM) is commonly used for the estimation of the exchange current density (i0) on the HER. However, TEM is still hindered because of some issues, such as the improper reading of Tafel slope and the influence of physical resistant. The differential polarization method (DPM) was introduced in this dissertation as a reliable method to estimate the value of the i0. The research was conducted a measurement of HER on copper electrode in 0.5 mol dm-3 H2SO4 solution. The value of i0 is calculated using both methods; the TEM and the DPM. It found that the DPM is a promising method in the calculation of i0. 3. Biodiesel fuel and biogas fuel as promising alternative energy sources for dual‐fuel mode(DFM) diesel engine attract more researchers. Therefore, The DFM operation of diesel engine using biodiesel fuel from used cooking oil and simulated biogas fuel with different methane contents were conducted and focused on the combustion, rate of heat release, combustion stability, and performance. The observation of diesel engine was conducted by varying the torques and engine speeds. The relation of the results of biodiesel replacement, biogas energy ratio, and brake thermal efficiency with methane content ratio in DFM show that the methane content ratio has the maximum effect in DFM. In addition, the carbon dioxide content in the biogas can enrich the brake thermal efficiency. The combustion stability of all conditions is from 1.7% to 4.89%, which is still acceptable.doctoral thesi
衝撃荷重載荷時のFRPシート曲げ補強RC梁に関する数値解析 ーコンクリート構成則の適用性検討ー
Get PDFapplication/pdfIn order to establish a numerical analysis method for appropriately evaluating the impact behavior of the RC beams strengthened in flexure with FRP sheet under impact loading, 3D elasto-plastic impact response analyses of the RC beam were conducted by varying three different constitutive models for concrete: KCC; CSCM; and proposed model. The applicability of each constitutive model was investigated to compare with the experimental results. Results obtained from this study were as follows: 1) in the case of the unstrengthened RC beams, the dynamic impact behavior of the beam can be properly predicted irrespective of the models; and 2) in the case of the strengthened RC beams, the dynamic response behavior can be appropriately simulated by applying the proposed model.journal articl
The possibility of development of 'businesses-utilizing urban parks' from the viewpoint of local governments
Get PDFapplication/pdfThe purpose of this research is to consider the possibility of 'businesses-utilizing urban parks' and the difference between local governments in metropolitan areas and local governments in regional areas, paying attention to the viewpoint of local governments nationwide. The survey method of this research is based on a questionnaire survey distributed and collected by mail and targeting a total of 815 organizations in 20 government-designated cities, 772 cities, and 23 special wards nationwide at the time of the survey (August 1, 2019). Results of the survey show that, in order to disseminate 'businesses-utilizing urban parks' in the future, it is highly likely that it will be effective to publicize specific introduction cases rather than abstract information such a philosophy and concepts. Furthermore, it is inferred that formulating a master plan for the park management is effective in facilitating consensus building between local government organizations, and it is important to provide a place of learning for administrative staff and private businesses. In addition, in metropolitan areas, there are many local governments that are keenly aware of 'businesses-utilizing urban parks', while in regional areas, it is presumed that there are still few local governments that are conscious of 'businesses-utilizing urban parks'.journal articl
Pore Filling Effect of Forced Carbonation Reactions Using Carbon Dioxide Nanobubbles
Get PDFapplication/pdfVarious methods for repairing and modifying concrete surfaces have been proposed and applied to improve the durability of existing concrete structures. Surface modification through forced carbonation is a method of densification that forms calcium carbonate in the pores on the surface of concrete to improve its durability. In this study, to evaluate the applicability of this surface modification method to existing buildings, a series of experiments was conducted in which mortar specimens were repeatedly immersed in a carbon dioxide nanobubble aqueous solution. By evaluating the weight change and absorption rate, it was determined that the higher the water/cement ratio of the mortar specimen, the higher the pore filling effect owing to immersion in the carbon dioxide nanobubble aqueous solution. In addition, the effect of clogged pores generated by the precipitation of calcium carbonate was confirmed, and it was found that the higher the water/cement ratio of the mortar specimen, the higher the pore filling effect due to clogging. We believe that our findings contribute to the development of research and construction practices associated with concrete repair and restoration.journal articl