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나노 입자 증착 공정으로 제작한 TiO₂ 박막의 물 분해 장치 개발 및 특성 평가
최정오(Jung-Oh Choi),송성혁(Sung-Hyuk Song),한홍택(H. Thomas Hahn),안성훈(Sung-Hoon Ahn) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Nano-sized TiO₂ photo catalytic water-splitting technology has great potential for low-cost, environmentally friendly solar-hydrogen production to support the future hydrogen economy. Presently, the solar-to-hydrogen energy conversion efficiency is too low for the technology to be economically sound. The main barriers are the rapid recombination of photo-generated electron/hole pairs as well as backward reaction and the poor activation of TiO₂ by visible light. In response to these deficiencies, many investigators have been conducting research with focused on the enhancement of photo catalysis by modification of TiO₂. This paper focus on the development of TiO₂ film for water splitting system using nano particle deposition system(NPDS).
직조 형태의 지능형 연성 복합재료를 이용한 쉘 구동기의 제작
한민우(Min-Woo Han),송성혁(Sung-Hyuk Song),추원식(Won-Shik Chu),이경태(Kyung-Tae Lee),이재원(Daniel Lee),안성훈(Sung-Hoon Ahn) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.1
Smart material such as SMA (Shape Memory Alloy) has been studied in various ways because it can perform continuous, flexible, and complex actuation in simple structure. Smart soft composite (SSC) was developed to achieve large deformation of smart material. In this paper, a shell actuator using woven type SSC was developed to enhance stiffness of the structure while keeping its deformation capacity. The fabricated actuator consisted of a flexible polymer and woven structure which contains SMA wires and glass fibers. The actuator showed various actuation motions by controlling a pattern of applied electricity because the SMA wires are embedded in the structure as fibers. To verify the actuation ability, we measured its maximum end-edge bending angle, twisting angle, and actuating force, which were 103°, 10°, and 0.15 N, respectively.
김민수(Min-Soo Kim),송성혁(Sung-Hyuk Song),김형일(Hyung-Il Kim),안성훈(Sung-Hoon Ahn) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.1
Intricate deflection requires many conventional actuators (motors, pistons etc.), which can be financially and spatially wasteful. Novel smart soft composite (SSC) actuators have been suggested, but fabrication complexity restricts their widespread use as general-purpose actuators. In this study, a hybrid manufacturing process comprising 3-D printing and casting was developed for automated fabrication of SSC actuators with 200 μm precision, using a 3-D printer (3DISON, ROKIT), a simple polymer mixer, and a compressor controller. A method to improve precision is suggested, and the design compensates for deposition and backlash errors (maximum, 170 μm). A suitable flow rate and tool path are suggested for the polymer casting process. The equipment and process costs proposed here are lower than those of existing 3D printers for a multi-material deposition system and the technique has 200 μm precision, which is suitable for fabrication of SSC actuators.
Fabrication of Miniature High-Speed Actuator Capable of Biomimetic Flapping Motions
Min-Sik Kim(김민식),Sung-Hyuk Song(송성혁),Min-Woo Han(한민우),Won-Shik Chu(추원식),Sung-Hoon Ahn(안성훈) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.9
Beyond conventional military products, technologies in the defense industry sectors around the globe are integrated and fused with newly emerging technologies such as three-dimensional printing (3DP) and smart material fabrication. Acknowledging these trends, this study proposes a miniature high-speed actuator whose fabrication process entails 3DP, smart materials, and shape memory alloy. The manufactured actuator is 25 mm long and 5 mm wide in and weighs 2.5 g, having the optimal frequency in the range of 35-40 Hz. Force and deformation measurement were also conducted, resulting in the lift force of 0.18 N per second with a bending deformation of 5 mm.
천두만(Doo-Man Chun),윤해성(Hae-Sung Yoon),송성혁(Sung-Hyuk Song),김형중(Hyung-Jung Kim),안성훈(Sung-Hoon Ahn) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The number of engineering materials is increasing, and the product development cycle becomes shorter. At the same time, the requirements for product design become wider because the consumers are interested in the environmental aspect and aesthetic aspect as well as functional aspect. Under this circumstance, engineering designers should consider the multi-dimensional aspects for product design at the same time. However, there are few tools for multi-dimensional design method. Most design methods can support optimization of one dimension or provide information of each dimension. In this research, multi-dimensional design method was studied for engineering material selection. Material information contains material property, environmental impact, and cost. All numerical values of multi-dimensional information were demonstrated with graphical approach and the order of preferable materials was suggested.
박동일(Dongil Park),최태용(Taeyong Choi),김휘수(Hui-su Kim),송성혁(Sung-hyuk Song),박찬훈(Chanhun Park) 한국생산제조학회 2020 한국생산제조학회지 Vol.29 No.6
The demand for industrial robots has spread across several markets, ranging from the automobile market to the electric and electronic markets, including various IT products. Consequently, the demand for assembly process automation using robots is gradually increasing. Control technology for assembly processes using robots can be classified into two categories. The first method involves force control-based robot control, wherein the robot is actively directed for controlling assembly reaction forces. In the second method, assembly implementation is performed by attaching a passive compliance mechanism to the robot. However, in both methods, implementation of the assembly process through a commercial industrial robot can be difficult. To address this issue, we developed a gripper that can implement the assembly process through a commercial industrial robots which are operated in position-control based robot control. Furthermore, the obtained results are summarized in this paper.
섬유 강화 지능형 연성 복합재 구동기의 재료구성에 따른 거동특성 평가
한민우(Min-Woo Han),김형일(Hyung-Il Kim),송성혁(Sung-Hyuk Song),안성훈(Sung-Hoon Ahn) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The fiber-reinforced polymer (FRP) composites, which are made by combining a continuous fiber as a reinforcement and a homogeneous polymer material as a host, are known as a engineering materials to improve their strength and stiffness with lightweight structure. In this study, the shape memory alloy (SMA) reinforced composite actuator is described to generate a large deformation in a lightweight single structure which can be used in applications requiring a high degree of adaptability to the various external conditions. The proposed actuator consists of a multi-ply composed of individual lamina by embedding in a polymer matrix. To characterize its deformation behavior, the composition of the actuator was changed in terms of the matrix material, and the volume fraction of glass fiber fabric. Also, to study on the effect of heating SMA wires by applying current, different magnitudes of current were applied to each actuators.