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김광훈,최영욱,이홍식,임근희,Kim, Guang-Hoon,Choi, Young-Wook,Lee, Hong-Sik,Rim, Geun-Hie,Nikiforov, S.A. 대한전기학회 2001 전기학회논문지C Vol.51 No.3
The information of the ion composition in plasma applications is required to characterize a plasma. A better understanding of ion species composition ratio and its spacial distribution, etc. is thus necessary in plasma-related processes, such as thin film deposition, plasma-based ion implantation, semiconductor processing, and so on. In this research, a compact ion mass analyzer that is based on magnetic sector analyzer was developed and its operational characteristics were studied in nitrogen plasma.
프락셔널 레이저(Er:glass) 조사한 무모생쥐에서 교원질의 합성 및 TGF-β1의 발현
김성애 ( Sung Ae Kim ),이대식 ( Dae Sic Lee ),김광훈 ( Guang Hoon Kim ),김세르게이 ( Sergey Kim ),이규석 ( Kyu Suk Lee ) 대한피부과학회 2010 大韓皮膚科學會誌 Vol.48 No.2
Background: Non-ablative dermal remodeling and ablative skin resurfacing are currently well-established skin treatment modalities. Fractional laser was recently introduced as a new concept for laser skin rejuvenation, and is characterized by creation of a dense pattern of epidermal and dermal microthermal treatment zones (MTZs). However, the precise mechanisms of dermal remodeling by Er:glass fractional laser treatment are largely unknown. Objective: The purpose of this study was to investigate the effect of 1,550 nm Er:glass fractional laser treatment on dermal collagen synthesis and expression of TGF-β1, a potent cytokine involved in collagen synthesis. Methods: We treated hairless mice with several power densities (5 W 5 mJ∼20 W 20 mJ), and examined the tissue samples on days 1, 30, and 90 after treatment. We analyzed the penetrating depth of laser treatment by determining dermal response through assessment of type I collagen synthesis and TGF-β1 expression by H&E, Masson-trichrome staining, western blot analysis and immunohistochemistry staining. Results: We observed, through H&E staining, that increasing the pulse energy of fractional laser treatment correlated with increasing depth of MTZ. Also, fractional laser treatment increased type 1 collagen synthesis on days 30 and 90, energy dependently. Immunohistochemical study showed that fractional laser treatment increased expression of type I collagen and TGF-β1, energy dependently, with TGF-β1 expression peaking on day 1. In addition, according to western blot analysis, expressions of TGF-β1 and type I collagen were up-regulated in an energy-dependent manner. Conclusion: Er:glass fractional laser induced dermal remodeling by up-regulation of TGF-β1 and type I collagen synthesis, and may be a promising modality for skin rejuvenation. (Korean J Dermatol 2010;48(2):79∼86)