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Photoimmunological and Photobiological Action of Infrared Radiation
Danno, Kiichiro Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
While ultraviolet radiation alters various cutaneous cell functions, little is known about photo-immunological and photobiological effects of infrared radiation (IR) on the skin except its local thermal effects. The fIrst part of this study demonstrated that single exposure of mouse skin to near IR (0.7 - 1.3 $\mu$m) reversibly suppressed the proliferating activity of the epidermis, the density of Langerhans cells, and the ability of skin to induce contact hypersensitivity reaction. The second part demonstrated that the rate of wound closure was significantly accelerated by repeated exposures in animal models. The production of transforming growth factor-$\beta$l and matrix metalloproteinase-2, which are responsible for the wound healing processes, was significantly upregulated by irradiation, as shown by enzyme immunoassay, zymography, and reverse transcription polymerase chain reaction. Thermal controls were negative. The results suggest that near-IR irradiation can modulate the epidermal proliferation and part of the skin immune system, and stimulate the wound healing processes, presumably by non-thermal effects.
團兒晧文 대한방사선방어학회 1976 방사선방어학회지 Vol.1 No.1
本 原稿는 IAEA EXPERT로서 韓國原子力 硏究所에 設置된 放射線 加工 處理施設 運營에 대한 技術援助를 爲해 協力하고 있는 團野晧文氏가 本 學會를 위하여 奉仕的으로 投稿해준 것이고 具飜譯 및 整理는 陸鍾撤氏가 해준 것이다. 未備한 點이 있더라도 讀者의 諒解를 求합니다. (1976年 2月 16日)
Development of Low-Cost Deformation-based Micro Surface Texturing System for Friction Reduction
Song Xu,Sam Oh Jin An,Danno Atsushi,Sylvie Castagne 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.8
Surface texturing as a means for enhancing tribological properties of mechanical components has been under intensive investigation over the last two decades. Many methods have been proposed to create surface texture of various patterns and geometries. However, among all these methods, deformation-based micro-surface texturing is least studied. It has many advantages over other methods that could lead to immediate industry application, including high productivity, high geometry fidelity and low cost. In the current work, a simple but effective incremental micro embossing system based on a commercially available press has been developed to create micro surface textures of various shapes and depths with accuracy up to 5 μm. The friction coefficients of the textured surfaces have been tested at different loadings and speeds with various lubricants to demonstrate their friction reduction capability. It has been observed that at high speed conditions, the friction reduction is achieved by the hydrodynamic lift. Interestingly, at the low speed conditions, the micro-surface texture is still capable of reducing the friction, thanks to its lubricant retention and debris entrapment capability. A micro surface textured mechanical face seal demonstrator has been built to further evaluate the micro surface texture created by incremental embossing method. A reduction of 20% in torque friction has been consistently achieved, which is on a par with that of the laser surface texturing method.