Author
Chun-Gon Kim
Bio: Chun-Gon Kim is an academic researcher from KAIST. The author has contributed to research in topics: Fiber Bragg grating & Fiber optic sensor. The author has an hindex of 43, co-authored 347 publications receiving 6328 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this article, a radar absorbing structure (RAS) which can support loads and absorb the electromagnetic wave has been designed by blending conductive carbon black with the binder matrix of glass/epoxy composite.
Abstract: It is an important issue not only for military purposes but also from commercial point of view, whether or not the reflective wave from an incident electromagnetic wave can be nullified. In this research, by blending conductive carbon black with the binder matrix of glass/epoxy composite, a radar absorbing structure (RAS) which can support loads and absorb the electromagnetic wave has been designed. The RAS was specially designed so as to exhibit the optimum absorptivity for X-band of (8.2–12 GHz) frequency ranges, centered at 10 GHz. Its absorbing characteristics were also investigated. Unlike other existing measurements of reflection loss using a waveguide, the reflection loss within an anechoic chamber simulating the radar cross section method of measurement was used with a plane-wave shaped incident wave. An optimized multi-layer design of RAS using the adopted material system is described in this research.
345 citations
TL;DR: In this paper, the radar absorbing structures (RAS) having sandwich structures in the X-band (8.2-12.4 GHz) frequencies were designed and fabricated, and the reflection loss characteristics for multi-layer sandwich structures were calculated using the theory of transmission and reflection in a multi-layered medium.
293 citations
TL;DR: In this paper, the complex permittivities of E-glass/epoxy composite laminates were measured at the frequency band of 0.5-18.0 GHz and the effect of the different rates was examined by using Cole-Cole plots.
197 citations
TL;DR: In this paper, a genetic algorithm and a theory of the reflection/transmission of electromagnetic waves in a multi-layered RAS were applied to design an optimal RAS composed of MWNT-filled composites.
169 citations
TL;DR: The failure strength of composite bonded joint is not always proportionate to adhesion strength of adhesive due to the weakness of delamination in composite materials.
167 citations
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Posted Content•
TL;DR: The two-step solution-phase reactions to form hybrid materials of Mn(3)O(4) nanoparticles on reduced graphene oxide (RGO) sheets for lithium ion battery applications should offer a new technique for the design and synthesis of battery electrodes based on highly insulating materials.
Abstract: We developed two-step solution-phase reactions to form hybrid materials of Mn3O4 nanoparticles on reduced graphene oxide (RGO) sheets for lithium ion battery applications. Mn3O4 nanoparticles grown selectively on RGO sheets over free particle growth in solution allowed for the electrically insulating Mn3O4 nanoparticles wired up to a current collector through the underlying conducting graphene network. The Mn3O4 nanoparticles formed on RGO show a high specific capacity up to ~900mAh/g near its theoretical capacity with good rate capability and cycling stability, owing to the intimate interactions between the graphene substrates and the Mn3O4 nanoparticles grown atop. The Mn3O4/RGO hybrid could be a promising candidate material for high-capacity, low-cost, and environmentally friendly anode for lithium ion batteries. Our growth-on-graphene approach should offer a new technique for design and synthesis of battery electrodes based on highly insulating materials.
1,587 citations
1,401 citations
TL;DR: A comprehensive review on the state of the art of Lamb wave-based damage identification approaches for composite structures, addressing the advances and achievements in these techniques in the past decades, is provided in this paper.
1,350 citations
Journal Article•
1,178 citations
TL;DR: In this article, the synthesis, curing process, and application of epoxy resins are reviewed and a review of the final properties of cured epoxide resins is presented. But, the authors do not consider the type of epoxide resin, curing agent, and curing process.
1,132 citations