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Articles by Youn-Mook Lim
Total Records ( 3 ) for Youn-Mook Lim
  Youn-Mook Lim , Sung-Jun An , Hae-Kyoung Kim , Yun-Hye Kim , Min-Ho Youn , Hui-Jeong Gwon , Junhwa Shin and Young-Chang Nho
  Atopic dermatitis (AD) is a familial and chronic inflammatory pruritic skin disease that affects a large number of children and adults in industrialized countries. It is known that one of the prominent features of AD and chronic pruritus is partially due to the histamine released from mast cell. In this work, hydrogel patches with natural herbal extracts were prepared by “freezing and thawing”, and a gamma irradiation. It showed eminent healing results as a consequence of long-term moisturizing effects and natural herbal extracts on atopic wounds. Besides its non-toxicity and human harmlessness, it can be easily attached to or detached from the skin without any trace and help patients to feel refreshment when attached. Based on this work, the hydrogel patches we made can be potentially used as an alternative remedy for not only pruritus in AD, but other dermatitis.
  Jong-Seok Park , In-Hee Cho , Sung-Jin Gwon , Youn-Mook Lim and Young-Chang Nho
  The effects of the crystallinity and a radiation crosslinking on the high-density polyethylene (HDPE) with a nucleating agent were investigated. We found the optimum conditions for the stretching process according to the addition of various quantities of a nucleating agent (Millad3988). The pores of a HDPE membrane were affected by the crystallinity of the polymer, and the crystallinity of the polymer was changed with an increase thermal ageing temperature. Thermal ageing treatment of the HDPE film was conducted in an oven at 110–135 °C for 5–60 min. When the conditions for the annealing were fixed at 125 °C and 40 min, we obtained the highest crystallinity. Also, the resulting mechanical properties of the irradiated HDPE separators were analyzed.
  Young-Chang Nho , Jong-Seok Park , Jong-Kyu Youn , Youn-Mook Lim and Jun-Hwa Shin
  The photocatalytic activity of titanium dioxide prepared by a gamma-ray irradiation was investigated. The particles of the prepared TiO2 were very fine and had a narrow distribution. The particle size of the prepared TiO2 was in the range 20–100 nm and the average particle size was 61 nm from the particle size analyzer (PSA) result. The remaining ammonia gas after a UV irradiation was measured. Ammonia gas detection and analysis were carried out on a capillary column-gas chromatography (GC) system. The remaining ammonia gas of the prepared sample in a transparent tube after a UV irradiation was decreased owing to the neutralization reaction of the ammonium hydroxide and polyacrylic acid (PAC) and the photocatalytic activity of the nanosized TiO2 particles.
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