Publications by authors named "Kwan Hoon Kim"
Article Synopsis
- - Four-dimensional (4D) printing enhances traditional 3D printing by introducing movement in response to external stimuli, with potential uses in industries like robotics, aerospace, and automotive.
- - This study investigates a new method of 4D printing by integrating microcellular foaming processes with common materials like PLA, design patterns, and evaluating their dynamic behaviors.
- - Results show that 3D-printed specimens can achieve predictable deformations through gas saturation, indicating that conventional materials can be used for 4D printing, paving the way for innovative applications without needing specialized smart materials.
Article Synopsis
- Previous studies faced challenges in measuring changes in high-pressure vessels due to sensor issues and gas desorption errors in polymer-gas mixtures.
- A new device using magnetic sensors was developed to measure real-time gas-saturated polymer changes inside high-pressure vessels, specifically testing polymethyl methacrylate under varying temperatures and pressures.
- The study proposes a new model for deflection in high-pressure environments and demonstrates that this method allows for accurate, in-situ measurement of polymer behavior, aiding in better control of high-pressure polymer processes.
This study proposes a novel process that integrates the molding and patterning of solid-state polymers with the force generated from the volume expansion of the microcellular-foaming process (MCP) and the softening of solid-state polymers due to gas adsorption. The batch-foaming process, which is one of the MCPs, is a useful process that can cause thermal, acoustic, and electrical characteristic changes in polymer materials. However, its development is limited due to low productivity.
View Article and Find Full Text PDFSeveral researchers have investigated the phenomenon of polymer-gas mixtures, and a few have proposed diffusion coefficient values instead of a diffusion coefficient model. There is a paucity of studies focused on the continuous change in the diffusion coefficient corresponding to the overall pressure and temperature range of the mixture. In this study, the gas sorption and desorption experiments of poly(methyl methacrylate) (PMMA) were conducted via solid-state batch foaming, and the weight change was measured using the gravimetric method with a magnetic balance.
View Article and Find Full Text PDFSesame oil cakes (SOC) produced during sesame oil production can be classified as plant residues. This study aims to use SOC as a composite material for injection molding. A biocomposite containing polypropylene (PP) and SOC, namely PP/SOC, was developed and its mechanical properties were evaluated.
View Article and Find Full Text PDFDespite the potential of learning analytics for personalized learning, it is seldom used to support collaborative learning particularly in face-to-face (F2F) learning contexts. This study uses learning analytics to develop a dashboard system that provides adaptive support for F2F collaborative argumentation (FCA). This study developed two dashboards for students and instructors, which enabled students to monitor their FCA process through adaptive feedback and helped the instructor provide adaptive support at the right time.
View Article and Find Full Text PDFContext: Despite the growing use of virtual patients (VPs) in medical education, few studies have explored the features and effectiveness of VP-based medical communication skills training. We undertook a systematic review to summarise the design and evaluation of VP-based medical communication skills training systems in order to identify features of successful cases.
Methods: Following PRISMA guidelines, we searched four databases for studies published between 2006 and 2018.