간행물
한국기계항공기술학회지(구 한국기계기술학회지) KCI 등재 Journal of the Korean Society of Mechanical and Aviation Technology
- 발행기관 한국기계기술학회
- 자료유형 학술지
- 간기 격월간
- ISSN 1229-604X (Print)2092-0385 (Online)
- 수록기간 1999 ~ 2026
- 주제분류 공학 > 기계공학 공학 분류의 다른 간행물
- 십진분류KDC 550DDC 620
권호리스트/논문검색
제28권 제2호 (2026년 4월) 25건
21.
2026.04
구독 인증기관 무료, 개인회원 유료
A needle-free automatic injection syringe is a device that delivers drugs into the skin and tissues using a high-speed fluid jet without using an injection needle. This technology is attracting attention as an efficient means of vaccine delivery in the veterinary and livestock fields that reduce the risk of cross-infection and require mass vaccination. In particular, animal vaccination provides various advantages over conventional needle injection methods in terms of worker safety, inoculation speed, and maintenance cost. Among these drivers, Jet Injector Nozzle's flow path design is very important in needleless automatic injection syringes. This paper was conducted to solve the problem of pressure loss at the nozzle discharge side of the existing Jet Injector in designing the flow path of the animal vaccine-free automatic injection syringe nozzle. To this end, CAE was performed and the optimum design of the flow path required by the company was performed, and a large flow rate was possible in the optimal shape design, but this focuses on the nozzle flow path, which requires a review of design additions of cylinders and motors on the rear side.
3,000원
22.
2026.04
구독 인증기관 무료, 개인회원 유료
Injection-molded products frequently exhibit localized surface defects such as weld lines, flow marks, scratches, bubbles, and burn marks due to variations in material flow, mold temperature, and cooling conditions. Conventional visual inspection is highly dependent on operator experience, while rule-based machine vision methods are limited under variations in lighting and surface texture. This study proposes a deep learning–based defect detection model using YOLOv8 combined with a novel Defect-Aware Augmentation technique designed to enhance robustness for small, local defect regions. The proposed augmentation pipeline includes geometric transformations, optical perturbations, local defect patch synthesis, and diffusion-based synthetic defect generation. Experiments were conducted on a custom dataset of 5,000 images (3,000 normal and 2,000 defective). Results show that the proposed model achieves significant improvements over baseline models, obtaining 95% precision, 90% recall, and 0.96 mAP@0.5, outperforming the default YOLOv8 model by 7%p in mAP. Ablation studies verify that defect-aware augmentation is the dominant factor contributing to the performance gain. The proposed system demonstrates high applicability for automated quality inspection in injectionmolding production lines.
4,000원
23.
2026.04
구독 인증기관 무료, 개인회원 유료
Fiber laser welding is a promising joining process for cryogenic stainless steel structures because of its high energy density, narrow heat-affected zone, and low thermal distortion. In particular, SUS316L stainless steel has been considered a suitable candidate material for cryogenic storage systems due to its favorable corrosion resistance, weldability, and mechanical stability at low temperatures. In this study, butt welding of 10 mm-thick SUS316L plates was performed using a fiber laser process, and the effects of welding conditions on weld cross-sectional geometry and mechanical properties were investigated. Five welding conditions were applied by varying laser power and welding speed, and double-sided 2-pass welding was conducted for all cases. Cross-sectional observation was carried out to evaluate bead geometry, including bead width, concave geometry, and penetration depth. Tensile tests and Charpy impact tests at -196 °C were also performed on the welded joints. The results showed that decreasing welding speed and increasing laser power generally increased bead width and penetration depth. Yield strength ranged from 288.6 to 306.6 MPa, tensile strength from 584.3 to 595.7 MPa, elongation from 47.4 to 50.0%, and cryogenic impact value from 37.0 to 52.7 J. Among the tested conditions, the 4.0 kW-0.7 mpm condition showed the most balanced mechanical performance, especially in terms of elongation and cryogenic impact toughness. These results provide useful basic data for selecting reliable fiber laser welding conditions for SUS316L cryogenic storage structures.
4,000원
24.
2026.04
구독 인증기관 무료, 개인회원 유료
Racing boats operate under high-speed conditions and repetitive rapid maneuvers, where the performance of the propulsion system plays a critical role in race outcomes. The propeller is a key component that converts engine rotational power into thrust and must maintain structural stability under high rotational speeds and hydrodynamic loading. In this study, a racing boat propeller based on a carbon fiber reinforced plastic(CFRP) laminate structure was designed and a manufacturing process was established. The proposed propeller consists of a two-blade configuration in which the hub and blades are integrated into a single structure to minimize structural discontinuity under high rotational conditions. The composite propeller was fabricated using a prepreg lay-up process followed by vacuum-assisted thermal curing. In addition, flat laminate panels with the same carbon fiber lay-up configuration as the propeller were simultaneously manufactured to prepare bending test specimens for process verification. Flexural tests were conducted to evaluate the mechanical characteristics of the CFRP laminate structure. The results of this study provide fundamental data for the design and manufacturing of lightweight CFRP-based racing boat propellers.
4,000원
25.
2026.04
구독 인증기관 무료, 개인회원 유료
This study evaluates the bonding strength characteristics of carbon fiber–foam sandwich structures for application in Wing-In-Ground(WIG) craft. Sandwich panel specimens were fabricated using low-temperature curing carbon fiber prepreg and PVC foam cores. The specimens were manufactured through a vacuum oven molding process to produce composite sandwich panels. To investigate the structural performance and interfacial bonding characteristics between the face sheet and the core, flexural tests and drum peel tests were conducted. The flexural tests were performed to evaluate the structural stiffness and failure behavior of the sandwich structure, while the drum peel tests were used to assess the adhesive bonding strength between the carbon fiber skin and the foam core. Based on the experimental results, the interfacial bonding behavior and failure characteristics of the carbon fiber–foam sandwich structures were analyzed. The results of this study are expected to provide fundamental data for the structural design and bonding performance evaluation of composite sandwich structures for WIG craft applications.
4,000원
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