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
제27권 제5호 (2025년 10월) 50건
1.
2025.10
구독 인증기관 무료, 개인회원 유료
This research identifies security vulnerabilities in IoT-based healthcare authentication, specifically replay attacks, session key predictability, and biometric data leakage. We propose enhancements like adaptive timestamp verification and hybrid entropy sources for stronger session keys. Quantum-resistant cryptography and advanced biometric data protection are also recommended.
4,000원
2.
2025.10
구독 인증기관 무료, 개인회원 유료
A compact vibratory bowl feeder system is proposed to transport lightweight annular film components. Vibration analysis was conducted to calculate its natural frequencies, and the motion characteristics of the bowl and transported parts were analyzed under resonance excitation at varying supply voltage levels. The natural frequencies of the proposed system were found to be 157Hz, 249Hz, and 505Hz. At these resonance frequencies, significant rotational vibrations occurred, while vertical vibrations were relatively small. Especially at 505Hz, bending of the leaf spring caused large rotational motion of the bowl. The part feeding speed increased linearly with the applied voltage, reaching 4mm/sec at 100V and 18mm/sec at 200V. At 157Hz and 249Hz excitation frequencies, large rotational and vertical vibrations were observed, respectively. Under rotational vibration, the parts moved forward via jumping motion when the bowl's velocity amplitude was relatively large, or via slipping when smaller. Minor backward slipping was also observed. Under vertical vibration, parts exhibited forward jumping motion without back-and-forth slipping.
4,000원
3.
2025.10
구독 인증기관 무료, 개인회원 유료
In this study, quantum dots with Au/CdSe complex cores composed of Au as a metal base were synthesized, syrup was prepared, and coated on natural simulated LED unit modules, and the optical properties of traffic signs using them were investigated, and the following conclusions were obtained. The nanoparticles synthesized at 260°C and 280°C grew into irregular shapes with PL wavelengths of 624-627㎛, half-widths of 35㎛, PL-QY ratios of 55-61%, and grain diameters of 5-7㎛. The quantum dot syrup was applied to the LED unit module to produce a traffic sign composed of 4CL unit modules, and the luminance of 179 ㏅/㎡, insulation resistance of 10,000㏁, and insulation withstand of 500V were achieved, meeting the performance and specifications of the standard guidelines for luminescent traffic safety signs. The surface temperature of the unit module laminated with 4CL resin is 24~25℃, which shows a stable heat distribution, confirming that it can be applied as a sign using unit modules.
4,000원
4.
2025.10
구독 인증기관 무료, 개인회원 유료
This study focuses on electro-galvanizing of iron materials. Zinc plating provides superior corrosion resistance at a low cost due to zinc's lower potential (Zn: -0.76V) compared to iron (Fe: -0.44V), enabling it to act as a sacrificial layer. The paper also highlights the need for post-plating chromate or coating treatments to prevent the surface corrosion of zinc itself. The primary objective of this research is to analyze how different electro-galvanizing bath solutions influence key plating characteristics, such as uniformity of deposition and hydrogen embrittlement. The study examines various bath types, including acidic and alkaline solutions. Acidic baths, like zinc sulfate solutions, are shown to be suitable for high-current plating, ideal for high-speed processes like wire rod plating. Alkaline baths, such as cyanide solutions, produce a dense and glossy deposit, commonly used for decorative and anti-corrosion applications. Through a quantitative analysis of each solution's current efficiency and uniformity of deposition, this paper provides valuable insights for selecting the optimal plating bath in industrial applications.
4,000원
5.
2025.10
구독 인증기관 무료, 개인회원 유료
Marine mines are placed in major ports with high cargo volumes and military ports where naval vessels are anchored, and can pose a significant obstacle to naval operations. Thus, minesweeping is a very important operation to open up sea route for warships and merchant ships to enter and exit easily. This paper describes the design and testing of underwater speaker for sweeping acoustic mines. In order predict the performance of the underwater speaker, an acoustic analysis was performed with a unit force of 1N applied to the diaphragm. Then, the driving force and displacement were calculated to satisfy the target performance. Since acoustic testing using microphones can generate undesirable noise sources under anechoic conditions, the results of accelerometer measurements were converted to source levels to predict the results. During the land tests, a laser displacement sensor was simultaneously used to verify the validity of the accelerometer measurement results. Finally, marine testing confirmed that the full-frequency sound pressure levels of the underwater speaker satisfied the target performance.
4,000원
6.
2025.10
구독 인증기관 무료, 개인회원 유료
In this study, when Butyl ether, a type of diether-based oxygenated fuel, is mixed in each volume ratio in a naturally aspirated direct injection diesel engine, the exhaust gas emission characteristics of the oxygenated component in the fuel affect each operating area of the engine I wanted to investigate the effect on. For comparative measurement of engine performance and exhaust emissions, commercial diesel and butyl ether mixed fuels were classified into 4 types according to the mixing ratio and tested. As the content of butyl ether in fuel increases, soot emission reduction increases, and when the maximum mixing amount of butyl ether (diesel 80vol-% + BE 20vol%) is applied, compared to the case of using only diesel as fuel, at 2500 rpm and no load, 39%, and about 32% of smoke reduction effect at full load was confirmed.
4,000원
7.
2025.10
구독 인증기관 무료, 개인회원 유료
This study investigates the flow resistance and heat transfer characteristics of a fin-and-tube heat exchanger, applied to a water-cooled thermal management system designed for a cabinet-mounted high-performance computer operating aboard naval vessels. The analysis was conducted through both experimental and numerical approaches, focusing on the evaluation of heat transfer performance (j factor) and flow resistance (f factor) under varying air flow rates, while maintaining a fixed fin geometry and arrangement. Particular emphasis was placed on assessing the variation of the j factor along the total length of the heat exchanger to understand the impact of exchanger length on thermal performance. In the numerical analysis, instead of modeling the entire heat exchanger, a representative repeated unit composed of a single fin and twelve connected tubes was simulated. The outlet temperature from each tube segment was sequentially used as the inlet condition for the subsequent segment. This methodology significantly enhances computational efficiency while providing reliable predictions of progressive thermal characteristics along the flow path.
4,000원
8.
2025.10
구독 인증기관 무료, 개인회원 유료
The human body has many degrees of freedom (1-3 degrees of freedom) per joint, enabling smooth and stable walking. However, unlike humans, robots require many more joints, and their design necessitates the control of numerous motors. However, controlling more motors leads to lower walking stability. Therefore, this paper studies a real-time control method for stable walking of a bipedal robot. To enable stable walking of a bipedal robot with 12 degrees of freedom, we study a method for generating and supplementing walking patterns between each joint using numerical analysis of the multi-joint robot's kinematics and learning-based AI. This research is to apply the adaptive control of neuron networks for the real-time attitude control of Multi-articulated robot. Multi-articulated robot is expressed with a complicated mathematical model on account of the mechanic, electric non-linearity which each articulation of mechanism has, and includes an unstable factor in time of attitude control. If such a complex expression is included in control operation, it leads to the disadvantage that operation time is lengthened. Thus, if the rapid change of the load or the disturbance is given, it is difficult to fulfill the control of desired performance. In this research we used the response property curve of the robot instead of the activation function of neural network algorithms, so the adaptive control system of neural networks constructed without the information of modeling can perform a real-time control. The proposed adaptive control algorithm generated control signs corresponding to the non-linearity of Multi-articulated robot, which could generate desired motion in real time.
4,000원
9.
2025.10
구독 인증기관 무료, 개인회원 유료
This study investigates the thermal behavior of H7 halogen headlamps through Computational Fluid Dynamics(CFD) analysis and experimental validation. Headlamp geometries were reconstructed via reverse engineering, and simulations incorporated conduction, convection, and radiation effects using the Discrete Ordinate (DO) model. Experiments were conducted using thermocouples and infrared thermography to validate the numerical predictions. The results showed good agreement, with average discrepancies of 3–5% confirming the reliability of the simulation framework. These results demonstrate that current thermo-fluid simulation can accurately capture complex thermal transport phenomena in headlamp assemblies. The proposed methodology is extendable to LED headlamps, providing a practical tool for aftermarket product design, replacement part evaluation, and optimization of next-generation automotive lighting systems.
4,000원
10.
2025.10
구독 인증기관 무료, 개인회원 유료
This study investigates the effect of different objective functions on the topology optimization of a loudspeaker basket for structural resonance avoidance. Three objective functions were considered: maximization of the first natural frequency, minimization of static strain energy, and minimization of dynamic strain energy. The results show that, for all objective functions, the first natural frequency increased significantly compared to the initial design, while both static and dynamic strain energies were reduced, indicating effective suppression of structural resonance. Although the performance differences among the objective functions were not substantial, minimization of static and dynamic strain energy exhibited higher computational efficiency compared to natural frequency maximization. In particular, minimization of static strain energy demonstrated advantages in computational efficiency and ease of implementation, suggesting it as a practical alternative for resonance-avoidance design of loudspeaker baskets. This study highlights the importance of objective function selection by quantitatively comparing optimization outcomes under different formulations.
4,000원
11.
2025.10
구독 인증기관 무료, 개인회원 유료
Pipe organs are an important element of acoustic performance and usage of concert hall, considered as one of indicators of classical music hall. However, only limited numbers are installed or planned for local concert halls. Therefore, in order to investigate the influence of the pipe organ to the concert hall and compare with variable acoustic equipment, acoustic parameters were measured and evaluated in conditions without the pipe organ and after installation. Moreover, acoustic parameters according to acoustic variable equipment were measured and evaluated to figure out an impact on acoustic performance. The result indicates that differences of parameters according to the presence of the pipe organ were, 0.66 sec in reverberation time (RT), 0.1 in bass ratio (BR), 0.66 sec in early decay time(EDT), 2.18dB in clarity (C80), 0.12dB in strength(G), and 0.16 in lateral energy fraction(LFC). Differences of acoustic parameters due to acoustic variable equipment were 0.86 sec in reverberation time(RT), 0.09 in bass ratio(BR), 0.78 sec in early decay time(EDT), 0.64dB in clarity(C80) and 2.34dB in strength(G).
4,000원
12.
2025.10
구독 인증기관 무료, 개인회원 유료
To reduce the transient pressure oscillations (hunting) in pilot valves used in control systems of nuclear power plants, this study investigates the effect of orifice angle design using computational fluid dynamics (CFD). A conical orifice geometry with a base radius of 1.25 mm and a length of 1 mm was modeled with varying angles (10°, 20°, and 30°). The models were analyzed using transient flow simulation in ANSYS CFX, applying a k-ω turbulence model to accurately capture near-wall flow characteristics. The results showed that larger orifice angles led to reduced pressure hunting, improving system stability. Additionally, velocity and pressure distributions demonstrated smoother flow and smaller fluctuations at higher orifice angles. The findings indicate that optimizing orifice angle is an effective strategy to suppress pressure hunting in pilot valve systems.
4,000원
13.
2025.10
구독 인증기관 무료, 개인회원 유료
Active electronically scanned array (AESA) multi-function radars (MFRs) comprise numerous transmit/receive modules (TRMs) whose maximum temperature and temperature uniformity must be tightly controlled. This study proposes a new liquid-cooling-plate flow-channel design for an X-band AESA MFR: a two-layer straight channel incorporating multiple fins irregularly spaced along the flow channel. The proposed design (Type-4) is compared with three baseline channel designs. At the same coolant flow rate, Type-4 reduces the TRM maximum temperature by 28.2 K and the maximum inter-module temperature difference by 19.7 K relative to Type-1. However, the pressure drop increases by 726% because of the added internal surfaces and fins which are flow obstructions. A comprehensive thermo-hydraulic comparison, including pumping power criteria, is conducted over multiple flow-rate conditions. Overall performance was highest for Type-4, followed by Type-2, Type-3, and Type-1. When designs achieve similar maximum temperature and temperature difference with various coolant flowrate condition, Type-2 requires 83.6% less pumping power than Type-1, and Type-4 requires 33.8% less pumping power than Type-2.
4,000원
14.
2025.10
구독 인증기관 무료, 개인회원 유료
This study investigates the enhancement of crew survivability in armored vehicles, particularly against anti-tank mine threats. Human injury criteria were evaluated according to the STANAG 4569 AEP-55, Volume 2 standard to assess the vehicle’s protective performance. Analyses focused on mitigating tibia compression force, identified as a critical challenge in meeting the survivability requirements. Through parametric simulations, the influence of foam compressive strength and thickness on tibia compression force was investigated. Results demonstrate that increasing both foam compressive strength and thickness effectively delays the dissipation of impact energy, leading to a significant reduction in tibia compression force. These findings provide valuable insights for optimizing the design of armored vehicle structures to enhance crew survivability against mine blasts.
4,000원
15.
2025.10
구독 인증기관 무료, 개인회원 유료
This study examines the deformation and stress characteristics of an aerospace turbine wheel under centrifugal, thermal and pressure loads. Design modification is focused on the neck of the disk, which is a structurally critical area. Increasing the neck thickness significantly reduces radial deformation from centrifugal force, while thermal and pressure-induced deformations remain nearly unchanged. Stress at the blade root is minimally affected by geometric changes, but the disk neck stresses decrease notably when the radius is between 3.25 and 4.00 mm. Beyond 4.00 mm, stress rises again due to a shift in the peak stress location to the rear side. Yielding is first observed at a 3.5 mm radius, where deformation is also reduced to 0.29 mm. This geometry thus offers the best balance between strength and deformation. The findings provide a method to determine optimal neck design for prescribed design conditions.
4,000원
16.
2025.10
구독 인증기관 무료, 개인회원 유료
The automotive industry is rapidly shifting from hardware-focused design to Software Defined Vehicles (SDVs), where functions are flexibly updated through software. Embedded systems are central to this transition, ensuring real-time data processing and control across sensors, actuators, and controllers. Yet, most autonomous driving education and competitions have been designed for senior students, creating high entry barriers for early undergraduates. This study proposes an embedded practice-based education model for lower-year students, implemented through an autonomous driving competition. Arduino was adopted as an accessible embedded platform, enabling rapid prototyping and intuitive learning of sensor–controller–actuator integration. The curriculum was structured to advance from interrupt-based programming to Real-Time Operating System (RTOS)-based task scheduling, providing stepwise exposure to core SDV concepts. The model was validated through a mission-oriented competition that included line following, obstacle avoidance, and stop-line detection tasks. Dual assessment—combining technical performance indicators with rubric-based educational outcomes— demonstrated both algorithmic feasibility and pedagogical effectiveness. This work highlights that early undergraduates can gain meaningful SDV-oriented embedded control experience through lightweight competitions. The proposed framework offers an effective pathway for cultivating the next-generation mobility workforce, bridging the gap between theoretical education and practical implementation in the SDV era.
4,200원
17.
2025.10
구독 인증기관 무료, 개인회원 유료
This study analyzes the automotive behavior and its impact on driving safety when the Micro controller Unit (Micom), a core component of the automotive Engine Control Unit (ECU), is exposed to high temperatures. The automotive behavior was observed with and without the ECU housing cover under thermal exposure, and the temperature of the Micom was determined using heat transfer principles. The results showed that with the housing cover in place, a thermal equilibrium was maintained at approximately 160[°C], and the Micom's temperature was about 73[°C], which is within its guaranteed operating limits and did not affect the automotive behavior. When the housing cover was removed, the engine stoped to operate at approximately 220[°C], and it is presumed that the Micom's internal circuitry was damaged. These findings can provide useful quantitative data for future reliability assessments of ECUs and for investigations into sudden unintended acceleration phenomena.
4,000원
18.
2025.10
구독 인증기관 무료, 개인회원 유료
This study presents the design and application of an integrated control logic architecture for a 300BPD ES-SAGD(Expanding Solvent Steam-Assisted Gravity Drainage) demonstration plant, aimed at ensuring operational stability and efficiency. With the global expansion of unconventional oil resource development, ES-SAGD is recognized as a technology advantageous for reducing viscosity and improving energy efficiency compared to conventional SAGD. In this research, the plant process was analyzed to identify key control variables and potential risk factors, and a control logic structure integrating supervisory and unit-level control was designed. The stability and reliability of the control logic were validated through Hardware-in-the-Loop Simulation(HILS) and field implementation. The findings are expected to contribute to safer operation, reduced commissioning periods, and enhanced automation in future oil sands demonstration and commercial plants.
4,000원
19.
2025.10
구독 인증기관 무료, 개인회원 유료
This study investigates nozzle diameter and fuel type effects on combustion characteristics and NOx emissions in radiant tube heating systems through numerical simulation. Four fuels were analyzed: LPG, natural gas, coke oven gas, and hydrogen under varying nozzle conditions using computational fluid dynamics with energy conservation, species transport, and thermal NOx formation models. Results show that nozzle diameter optimization significantly enhances internal recirculation, improving fuel-air mixing and reducing NOx formation. Hydrogen exhibits higher flame temperatures, potentially increasing thermal NOx generation, but optimal nozzle design controls this effect through enhanced mixing patterns. The optimized configuration achieved substantial NOx reduction while maintaining combustion stability across all tested fuels.
4,000원
20.
2025.10
구독 인증기관 무료, 개인회원 유료
In this paper, the structural optimization and experimental validation of lightweight, high stiffness rollers for roll-to-roll(R2R) processing of lithium metal electrodes are presented. Precise dimensional control of electrode thickness below 50㎛ is essential for next-generation high energy density batteries, yet elastic recovery during rolling hinders the achievement of target specifications. To address this challenge, finite element(FE) analysis was employed to determine the optimal rolling gap and roller geometry, and the results were verified through R2R experiments. Simulations indicated that a rolling gap of 153㎛ yielded a final sheet thickness of about 49.6㎛, meeting the design requirement. Experimental results confirmed the validity of the numerical model, with thickness measurements deviating less than ±10% from FE analysis predictions. These findings demonstrate that the proposed roller design not only ensures thickness precision but also improves system efficiency, offering practical guidelines for scalable lithium metal electrode manufacturing.
4,000원
