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Analysis of the performance of robotic assembly systems considering the usage of tools or jigs for the task-board task in the WRS 2018

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Advanced Robotics 2023年第20期37卷 1329-1346页

作者： Dobashi, Hiroki Ogawa, Koki Shibata, Mizuho Uemura, Wataru Yokokohji, Yasuyoshi Faculty of Systems Engineering Wakayama University Wakayama Japan Graduate School of Systems Engineering Wakayama University Wakayama Japan Department of Robotics Faculty of Engineering Kindai University Higashi-Hiroshima Japan Electronics Information and Communication Engineering Course Faculty of Advanced Science and Technology Ryukoku University Otsu Japan Department of Mechanical Engineering Graduate School of Engineering Kobe University Kobe Japan

A task-board task is a task in which robots perform a set of fundamental assembly operations related to the assembly of a specific product such as inserting a part into another part, tightening bolts and nuts, attaching flexible parts, etc. In the task-board task competition in the industrial robotics category of the World Robot Summit (WRS) 2018, 15 teams from around the world performed the task. In our previous work, we observed recorded videos of the competition frame by frame and manually investigated the performance of robotic systems of the top four teams, focusing only on whether robots contact target parts. In this paper, we introduce frame sets to represent mainly contact states between robots, tools, or jigs and target parts to be handled for such a frame-by-frame analysis of the recorded videos, and based on the frame sets, we analyze the performance of robotic assembly systems of other teams as well as the top four teams in the task-board task competition in the WRS 2018, considering the usage of tools or jigs. © 2023 Informa UK Limited, trading as Taylor & Francis Group and The Robotics Society of Japan.

关键词： Robotic assembly

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A STUDY ON POSSIBILITY OF USING VR SPACE IN DESIGN EDUCATION (PART 2): VERIFICATION OF THE EFFECTIVENESS OF VR COMPARED TO 2D DRAWINGS AND 3DCAD BASED ON THE METHOD OF POINTING OUT ERROR OBJECTS

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Journal of Environmental engineering (Japan) 2024年第823期89卷 514-525页

作者： Hou, Ning Nishina, Daisaku Nishii, Shunki Jiang, Rui Kindaichi, Sayaka Sugita, So Matsuura, Yasuaki Graduate School of Advanced Science and Engineering Hiroshima University Japan Faculty of Environmental Studies Hiroshima Institute of Technology Japan

In recent years, VR has attracted attention as a new method in architectural design. VR will be expected to understand a space more easily, and more useful for improving designers’ ability. In this study, we proposed an evaluation method by performing "pointing out error objects" task, in order to understand the educational effects of tools used in architectural design education objectively. Based on this, we examined the superiority at each content of design process, between VR to traditional tools such as 2D drawings and 3DCAD. © 2024 Architectural Institute of Japan. All rights reserved.

关键词： Architectural design

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Analysis of Billing Inducement Methods in Smart-phone Games

Computer Software

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Computer Software 2024年第1期41卷 75-81页

作者： Asou, Naoki Nishiura, Kinari Sasakura, Mariko Monden, Akito Dept. of Information Technology Faculty of Engineering Okayama University Japan Graduate School of Natural Science and Technology Okayama University Japan

With the growth of the smartphone game market, many cases have been reported in which children have purchased charged items in games without restraint and have been charged large sums of money. In addition, there are users called"heavy payers" or"wasteful payers," who pay much more than the normal amount of money, and there are also reports of cases in which these users are disturbed in their daily lives. In this study, we actually play several representative smartphone games and analyze how developers induce users to pay for their games. As a result of extracting and tabulating the billing elements for each game, we found that many games employ a rich gacha system that makes consumers dependent on the game, similar to gambling, and that they also employ a number of game management strategies to make the amount charged look profitable and to stimulate user motivation to pay. © 2024 Japan Society for Software science and technology. All rights reserved.

关键词： Smartphones

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Evolutions of mechanical and thermal properties of TmNbO_(4)/Tm_(3)NbO_(7) composites as protective coating materials

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Journal of Advanced Ceramics 2024年第11期13卷 1771-1785页

作者： Jiankun Wang Lin Chen Baihui Li Hao Xu Xiang Jiang Jing-Feng Li Jing Feng Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Southwest United Graduate School Kunming 650092China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

High fracture toughness,low thermal conductivity,and thermal expansion coefficient(TEC)matching substrate are essential for thermal barrier coatings(TBCs)and abradable seal coatings(ASCs).In this work,TmNbO_(4)/Tm_(3)NbO_(7) composites are designed and synthesized to increase their fracture toughness(KIC)and thermal insulation *** with those of TmNbO_(4)(KIC=2.2±0.1 MPa·m^(1/2))and Tm_(3)NbO_(7)(KIC=1.7±0.2 MPa·m^(1/2)),the increments in fracture toughness are as high as 50.0%and 91.1%,*** highest toughness reaches 3.3±0.4 MPa·m^(1/2),which is attributed to the superior combination of grains between TmNbO_(4) and Tm_(3)NbO_(7),as well as the simultaneous effects of microcracks and crack bridging and *** estimation of the effect of the interfacial thermal resistance on the thermal conductivity at low temperatures was achieved using the minimum interfacial thermal resistance model.A novel method is proposed to inhibit radiative heat transfer by utilizing oxides with glass-like thermal conductivity to suppress thermal ***,the TmNbO_(4)/Tm_(3)NbO_(7) composite maintains a low thermal conductivity(1.19–2.02 W·m^(−1)·K^(−1))at 1000°*** high TECs(10.4×10^(−6)–11.8×10^(−6)·K^(−1) at 1500°C)and excellent high-temperature stability ensure that the designed TmNbO_(4)/Tm_(3)NbO_(7) composites can be used at temperatures reaching 1500°***,simultaneous enhancement of fracture toughness and thermal insulation in TmNbO_(4)/Tm_(3)NbO_(7) composites is effective,and the revealed mechanisms are useful for various materials.

关键词： thermal barrier coatings(TBCs) toughening mechanisms composites thermal conductivity thermal expansion thermal radiation

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Prediction Of Power Demand And Factor Identification Using Sparse Modeling AI With Ensemble Learning For Improvement Of Accuracy 13

Prediction Of Power Demand And Factor Identification Using S...

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Joint 13th International Conference on Soft Computing and Intelligent systems and 25th International Symposium on Advanced Intelligent systems, SCIS and ISIS 2024

作者： Hachiya, Tatsuma Kamei, Keiji Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology Fukuoka Japan Nishinippon Institute of Technology Faculty of Engineering Fukuoka Japan

ISBN: (纸本)9798350373332

We have been using sparse modeling AI to identify factors and predict in power demand. In this research, we applied ensemble learning to further improve the accuracy by integrating the results of multiple models. Experimental results showed that sparse modeling AI identified the demand factors, and ensemble learning achieved an average absolute prediction error of 7.5%. © 2024 IEEE.

关键词： Demand response

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VERIFICATION OF STRENGTH REDUCTION FACTOR RELATED TO OPENING HEIGHT OF RC MUTLI-STORY SHEAR WALLS FOR THE SHORT-TERM ALLOWABLE SHEAR DESIGN - For Vertically Aligned Door Openings

Journal of Structural and Construction Engineering

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Journal of Structural and Construction engineering 2023年第806期88卷 621-632页

作者： Liu, Hong Sanada, Yasushi Ichinose, Toshikatsu Faculty of Science and Technology Tokyo University of Science Japan Graduate School of Engineering Osaka University Japan Faculty of Science and Technology Meijo University Japan

Short-term allowable shear force of RC multi-story walls for safety assurance and damage control was specified in AIJ standard. However, this allowable force for multi-story shear walls with door openings was defined by limited data. In this study, based on the experimental results of five 1/4 scale multi-story shear wall specimens with various disposition of vertically aligned door openings, several strength reduction factors related to door openings were verified for the short-term allowable force based on the observed strengths for safety assurance and the observed residual crack widths for damage control. Consequently, an optimal reduction factor was suggested. © 2023 Architectural Institute of Japan. All rights reserved.

关键词： Shear walls

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Nanoparticle-stabilized CO_(2) foam flooding for enhanced heavy oil recovery:A micro-optical analysis

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Petroleum 2024年第4期10卷 696-704页

作者： Arifur Rahman Ezeddin Shirif Farshid Torabi Petroleum Systems Engineering Faculty of Engineering and Applied ScienceUniversity of ReginaReginaSK S4S 0A2Canada Petroleum and Mining Engineering School of Applied Science&TechnologyShahjalal University of Science and TechnologySylhet 3114Bangladesh

Surfactant flooding is a well-known chemical approach for enhancing oil *** flooding has the disadvantage that it cannot withstand the harsh reservoir *** in oil recovery and release are made possible by the use of nanoparticles and surfactants and CO_(2)co-injection because they generate stable foam,reduce the interfacial tension(IFT)between water and oil,cause emulsions to spontaneously form,change the wettability of porous media,and change the characteristics of *** the current work,the simultaneous injection of SiO_(2),Al2O3 nanoparticles,anionic surfactant SDS,and CO_(2)in various scenarios were evaluated to determine the microscopic and macroscopic efficacy of heavy oil ***(interfacial tension)was reduced by 44%when the nanoparticles and SDS(2000 ppm)were added,compared to a reduction of roughly 57%with SDS ***-stabilized CO_(2)foam flooding,however,is unstable due to the adsorption of SDS in the rock surfaces as well as in heavy *** assess foam's potential to shift CO_(2)from the high permeability zone(the thief zone)into the low permeability zone,directly visualizing micromodel flooding was successfully executed(upswept oil-rich zone).Based on typical reservoir permeability fluctuations,the permeability contrast(defined as the ratio of high permeability to low permeability)for the micromodel flooding was ***,the results of the experiment demonstrated that by utilizing SDS and nanoparticles,minimal IFT was *** addition of nanoparticles to surfactant solutions,however,greatly boosted oil recovery,according to the findings of flooding *** ultimate oil recovery was generally improved more by the anionic surfactant(SDS)solution including nanoparticles than by the anionic surfactant(SDS)alone.

关键词： Micromodel CO_(2) foam Surfactant Nanoparticles Interfacial tension Heavy oil

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Mechanical property enhancements and amorphous thermal transports of ordered weberite-type RE_(3)Nb/TaO_(7) high-entropy oxides

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Journal of Advanced Ceramics 2023年第2期12卷 399-413页

作者： Lin CHEN Keren LUO Baihui LI Mingyu HU Jing FENG Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Peking University Shenzhen Graduate School Shenzhen 518055China

A_(3)BO_(7)-type(A=rare earth(RE),B=Nb or Ta)oxides have been studied as protective coating materials because of their low thermal conductivity;however,their hardness,toughness,and stiffness are insufficient,particularly for members with webeirte-type *** this work,we have synthesized two high-entropy oxides(HEOs)of weberite-type RE niobates/tantalates(RE_(3)Nb/TaO_(7)),i.e.,(Nd_(1/7)Sm_(1/7)Eu_(1/7)Gd_(1/7)Dy_(1/7)Ho_(1/7)Er_(1/7))_(3)NbO_(7)(7HEOs-Nb)and(Nd_(1/7)Sm_(1/7)Eu_(1/7)Gd_(1/7)Dy_(1/7)Ho_(1/7)Er_(1/7))3(Nb_(1/2)Ta_(1/2))O_(7)(7HEOs-NbTa),to overcome the mechanical *** short-and long-range ordered arrangements of RE cations in the A-site and Nb/Ta cations in the B-site were identified by the X-ray diffraction(XRD),scanning electron microscopy equipped with energy-dispersive spectrometry(EDS),and transmission electron *** enhancements in hardness(H=9.4 GPa)and fracture toughness(KIC=2.0 MPa·m^(1/2))were realized by grain refinement,solid solution strengthening,and high stiffness(K).The exceptional phase stability at 25-1500℃,amorphous thermal conductivity(k=1.5-1.7 W·m^(−1)·K^(−1) at 25-900℃),and high thermal expansion coefficients(TEC>11.0×10^(−6) K^(−1) at 1500℃)further supported their potential application as protective coating materials.

关键词： high-entropy oxides(HEOs) RE niobates/tantalates(RE_(3)Nb/TaO_(7)) stiffness(K) fracture toughness(KIC) thermal transports

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On-surface Synthesis of Multiple Non-benzenoid Carbohelicenes Fused with Fluorene Unit(s)

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Chinese Journal of Chemistry 2024年第22期42卷 2811-2817页

作者： Wei Xiong Xi Geng Jianchen Lu Gefei Niu Boyu Fu Yi Zhang Shicheng Li Yuhang Yang Nianqiang Li Lei Gao Jinming Cai Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunmingYunnan 650093China Faculty of Science Kunming University of Science and TechnologyKunmingYunnan 650093China Southwest United Graduate School KunmingYunnan 650093China

Carbohelicenes have garnered considerable attention for their inherent chirality and structural *** multi-helicity and incorporating non-six-membered rings to substitute benzenoid rings within helicenes are effective strategies for introducing unique photoelectric *** the disclosure of numerous helicenes,the inaccessible precursors and the lack of synthetic routes pose a challenge in achieving desired helicene structures fused with non-benzenoid ***,we report the synthesis of multiple non-benzenoid carbohelicenes fused with fluorene unit(s)through intramolecular cyclodehydrogenation of 9,10-di(naphthalen-1-yl)anthracene on Au(111)*** potential cyclodehydrogenation manners between naphthyl and anthracene lead to the formation of fluorene-fused[5]helicene and[4]helicene ***,a total of four stable products were *** atomic topographies of products are characterized by bond-resolving scanning tunneling *** chiral helicity of targeted products can be switched by tip ***-functional-theory calculations unveils the reaction pathway of four *** comparative analysis of their respective energy barriers exhibits a correlation with the experimentally determined ***,we synthesize the polymer chains incorporating non-benzenoid carbohelicenes via the Ullmann reaction of 2,6-dibromo-9,10-di(1-naphthyl)anthracene *** work proposes a synthetic methodology for several novel helicene-like structures fused with fluorene units and the polymer bearing helicene subunits,thus highlighting the immense potential of these compounds in the application fields of luminescent electronic devices.

关键词： Helicene Scanning tunneling microscopy On-surface synthesis Helicity switching Hydrocarbons Molecular recognition Nanostructures

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Hardening of Cu/Carbon Steel Multilayered Sheet by Quenching

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Materials Transactions 2025年第6期66卷 752-757页

作者： Koga, Norimitsu Kato, Ryusei Watanabe, Chihiro Faculty of Mechanical Engineering Institute of Science and Engineering Kanazawa University Kanazawa920-1192 Japan Division of Mechanical Science and Engineering Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Ishikawa Kanazawa920-1192 Japan

A Cu/carbon steel multilayered sheet was quenched, and its tensile properties and electrical conductivity were evaluated. A full martensite structure was developed in the carbon steel layers in the multilayered sheet after quenching at 1063 K. The obtained Cu/martensite steel multilayered sheet exhibited a much higher ultimate tensile stress and approximately identical electrical conductivity compared to those in the Cu/carbon steel multilayered sheet without a quenching process. The decrease in the electrical conductivity during the quenching process in the multilayered sheet can be predicted from the decrease in the conductivity of the Cu layers owing to the diffusion of Fe atoms into the Cu layer. The ultimate tensile stress-electrical conductivity balance in the Cu/martensite steel multilayered sheet was 5.0 © 104 MPa%IACS, which is higher than that in conventional commercial Cu alloys. The ultimate tensile stress-total strain balance in the Cu/martensite steel multilayered sheet was significantly lower than that in each phase in the sheet. The measured ultimate tensile stress and electrical conductivity in the Cu/martensite steel multilayered sheet were approximately identical to the values estimated from the rule of mixture, using the tensile stress, electrical conductivity, and volume fraction of each component phase. This result indicates that the ultimate tensile stress and electrical conductivity of multilayered sheets can be easily controlled based on the rule of mixture. ©2025 Journal of Japan Institute of Copper.

关键词： Interdiffusion (solids)

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