Three-dimensional (3-D) printing, with its capability for producing arbitrary shapes, has shown great potential for usage in patient-specific tissue engineering. However, if artificial tissues are fabricated directly through typical 3-D printing processes, the mechanical properties, particularly for softness or flexibility, significantly differ from those of natural tissues, resulting in inappropriate side effects during surgeries using vascular grafts. However, this can be overcome through the indirect 3-D printing of templates created with a thin-film formation process, such as dip coating. Dip coating is performed in two steps, including dipping/withdrawing a target base template from a polymer solution, and then drying the solvent into a solid thin film on the template. However, it is difficult to form a uniform layer on the arbitrary template because the gravitational flow of the coated solution disturbs the uniformity of the template as the solvent is drying. Therefore, we minimized the flow around the template after dip coating by rapidly removing the solvent removal by dipping the solution-coated template into ethanol. This reduced the solvent removal time and increased the viscosity of the coated solution, thereby alleviating the gravitational flow of the coated solution, and allowing us to successfully fabricate flexible vascular grafts.
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Fabrication of Long Porous Vascular Grafts Using Nozzle-Transfer Dip-Coating System Seung-Mun Lee, Yeong-Seo Kim, Suk-Hee Park Journal of the Korean Society of Manufacturing Process Engineers.2023; 22(7): 11. CrossRef
A Study on the Mechanical Properties of a Biocompatible Conduit Structure based on Electrospun Fibers Jeong Hwa Kim, Jaewon Choi, Yong Jun Yoon, Young Hun Jeong Journal of the Korean Society for Precision Engineering.2022; 39(10): 739. CrossRef
Snow removal equipment in Korea has been developed to remove snow from roads by pushing it away with snow shovels or dispersing it into the air with snow blowers. However, in urban areas, it is difficult to use snow blowers. And piled snow on sidewalks not only hinder pedestrians from walking by, but also melt onto the roads during the day and freeze at night, causing traffic accidents. As a solution to this, there has been a need to develop a machine which melts snow on the place where high priority is given for snow clearing such as airports, roads of frequent black ice occurrence, and main traffic facilities. This paper describes the main design points and experimental results in developing the snow melting system composed of the burner, blower, water tank, etc. Hot air from the burner spouts into the water tank and some of it rises through the outer jacket where hot air is mixed with water in the tank, heating it. Hot air spouted to the bottom of water tank and hot water pouring from the head of the outer jacket are two sources of snow melting in designing the equipment.
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Study on Thermal Efficiency and Heat Transfer Analysis due to the Application of Snowmelting Deck of Carbon Fiber Heating Wire Jeong-Keun Kim, Hong-Gun Kim, Hee-Jun Eun, Lee-Ku Kwac Journal of the Korean Society of Manufacturing Process Engineers.2023; 22(2): 39. CrossRef
Scaffolds for bone tissue engineering (BTE) should accomplish appropriate mechanical, cell interaction, and new bone ingrowth properties. Among calcium phosphate (CaP) based bio-ceramics used for preparing scaffolds, biphasic calcium phosphate (BCP) is attracting great interest for fabricating BTE scaffolds owing to its excellent biocompatibility and osteoconductivity. Fused deposition modeling (FDM) is an additive manufacturing technology commonly used for modeling, prototyping, and production applications. It is one of techniques used for 3D printing. The main purpose of this study was to develop new fabrication process of BCP scaffolds based on extrusion moulding using a 3D printer. Through the 3D printer, we showed new fabrication process for making scaffold mould and extrusion device parts that could be combined with tension-compression test machine. Line width, pore size, and porosity of these fabricated BCP scaffolds were measured and calculated. Mechanical properties and cell proliferation results of these BCP scaffolds were then evaluated.
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Development of machine learning models for material classification and prediction of mechanical properties of FDM 3D printing outputs Su-Hyun Kim, Ji-Hye Park, Ji-Young Park, Seung-Gwon Kim, Young-Jun Lee, Joo-Hyung Kim Journal of Mechanical Science and Technology.2025; 39(2): 541. CrossRef
A Study on the Optimization of Mold Conditions for Fabrication of Bio-ceramic Scaffold via a FDM 3D Printer Min-Woo Sa, Jong Young Kim Journal of the Korean Society of Manufacturing Process Engineers.2024; 23(1): 42. CrossRef
3D printing of Hollow Biocompatible Ceramic Scaffold by Material Deposition and Volumetric Shrinkage Seok Kim Journal of the Korean Society of Manufacturing Technology Engineers.2019; 28(1): 31. CrossRef
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