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Recognition of Plastic Bottles Region Using Improved DeepLab v3+
Get PDFFactory automation is one solution to the labor shortage. We focus on the sorting of plastic bottles in waste disposal plants and try to automate the process using robotic arms. In this paper, we propose an image analysis method for the recognition of plastic bottles limited to 500ml capacity. The method is semantic segmentation, and the deep learning model is DeepLab v3+. Modifications using ECA Block and Mish function show improvements at the points of misrecognition with the base model.conference pape
A Gait Analysis with Multibody Dynamics Toward Energy-Efficient Active Knee Prostheses
Get PDFIn general, prosthetic knee users have a large stress in the locomotion due to less smoothness and unnecessary energy consumption. In the passive prosthesis, it is difficult to regulate the stiffness depending on the ground contact force. In consideration of designs for such an adaptivity to improve passive systems, we propose an artificial knee kinematics design to absorb the redundant contact force for the smooth and stable walking and explore necessary constraints for the proposed mechanics to be able to have multi-functions not only for walking but also knee flexion accumulating the power for jumping. In the analysis, we used Multibody Dynamics (MBD) to investigate. This result will contribute to design an integrated dynamic model by incorporating a flexible body and ground contact forces in various purposes.conference pape
Mechanical Evaluation of Novel High-Strength Lightweight Concrete with Core-Shell Structured Lightweight Aggregate
No full textCore-shell structured aggregates (CSA) offer a promising approach to lightweight concrete to reduce density, en- hance sustainability, and improve thermal insulation but face challenges such as stress concentration, poor interfacial bonding, and manufacturing limitations. This study investigates the critical factors influencing the performance of CSA-based lightweight concrete, including morphology, size, quantity, shell thickness, spatial distribution, and ma- terial composition. Based on this investigation, a novel capsule-shaped CSA (CCSA) was developed and evaluated through concrete compression experiments and finite element analysis. The steel-based lightweight concrete achieved a 16–19 % density reduction (1811–1879 kg/m3) while retaining 82–92 % of the compressive strength (32.6–36.8 MPa) of conventional concrete. For the PLA-based variants achieved a lower density (1383 kg/m3) but reduced strength (11.16 MPa), highlighting material-dependent trade-offs. The capsule design’s optimized geometry and sur- face treatments enhanced interfacial bonding and stress distribution, demonstrating its viability for structural applica- tions requiring lightweight and high-strength concrete.journal articl
Oligolysine Enhances and Inhibits DNA Condensate Formation
Get PDFThe formation of biomolecular condensates via phase separation relates to various cellular functions. Reconstituting these condensates with designed molecules facilitates the exploration of their mechanisms and potential applications. Sequence-designed DNA nanostructures enable the investigation of how structural design influences condensate formation and the construction of functional artificial condensates. Despite the high designability of DNA-based condensates, free nanostructures that do not assemble into condensates remain a challenge. Combining DNA nanostructures with other molecules, such as peptides, represents a promising approach to overcoming the limitations of DNA condensates and gaining a deeper understanding of molecular condensates. Herein, we report the effects of cationic oligolysines with several residues on DNA condensate formation assembled from Y-shaped DNA nanostructures. DNA condensate formation was enhanced by oligolysines at an appropriate L/P ratio, which refers to the ratio of positively charged amine groups in lysine (L) to negatively charged nucleic acid phosphate groups (P). Oligolysines with five residues enhanced condensate formation while maintaining the sequence-specific interaction of DNA. In contrast, oligolysines inhibited condensate formation depending on the L/P ratio and residue number. This was attributed to nanostructure deformation caused by oligolysines. These results suggest that the amount and length of cationic peptides significantly affect the self-assembly of branched DNA nanostructures. This study offers important insights into biomolecular condensates that can guide further development of DNA/peptide hybrid condensates to enhance the functions of artificial condensates for use in artificial cells and molecular robots.journal articl
持続可能な住民参加型道路維持管理制度の仕組みと地域コミュニティ活性化に関する研究
Get PDF九州工業大学九州工業大学博士学位論文（要旨）学位記番号: 工博甲第600号 学位授与年月日:令和7年3月25日thesi
車載用コモンモードチョークコイルによる妨害波抑制効果の簡易評価法に関する研究
Get PDF九州工業大学九州工業大学博士学位論文（要旨）学位記番号: 工博甲第603号 学位授与年月日:令和7年3月25日thesi
ソフトウェア不具合解析作業の効率化に向けたテキストログ異常検知に関する研究
Get PDF九州工業大学九州工業大学博士学位論文（要旨）学位記番号: 工博甲第605号 学位授与年月日:令和7年3月25日thesi
Effect of Introducing Leucine Residues into 2-Aminoisobutyric Acid-Based Amphiphilic Helical Peptides on Intermolecular Interactions and Peptide Self-Assembly
Get PDFIn recent years, self-assembling de novo-designed peptides have attracted increasing attention as materials for constructing submicrometer-scale structures. We have previously conducted structure–activity relationship studies on the BXBA-20 series of 20-residue amphiphilic peptides containing 2-aminoisobutyric acid (Aib) [Higashimoto, Y. et al. (1999) J. Biochem. 125, 705–712; Hara, T. et al. (2001) J. Biochem. 130, 749–755; Taira, J. et al. (2010) J. Pept. Sci. 16, 607–612]. These peptides share the common sequence Ac-(Aib-Xxx-Aib-Ala)5-NH2, where the introduction of a hydrophilic amino acid at the Xxx position results in the formation of a hydrophilic face on one side of the helix. Among them, some peptides exhibited weak intermolecular association and interactions with lipid membranes, though none demonstrated the ability to form submicrometer-scale structures through self-assembly. In this study, we present BKBL-20, a new member of this peptide series incorporating leucine on the hydrophobic face and lysine on the hydrophilic face. Circular dichroism spectroscopy indicated strong association in buffer, while hemolysis assays revealed significant membrane disruption. Transmission electron microscopy further confirmed the formation of ordered fibrous or array-like structures. These findings suggest that BKBL-20 successfully combines self-assembly and membrane-disruptive functions.journal articl
An Underwater Self-Positioning System with a Smartphone Based on Visual-Inertial Odometry and Trajectory Matching
Get PDFThe introduction of net cleaning robots is required in aquaculture. For an efficient operation of net cleaning robots, a high-precision underwater self-positioning system is required. In this research, we have proposed and verified a method by VIO and trajectory matching using a smartphone for the purpose of implementing a small underwater self-positioning system to be implemented in a net cleaning robot. The verification results shows that the system is possible to achieve highly accurate self-position estimation by correcting the estimated position by trajectory matching.journal articl
