S-PPM:韩国质量革新计划

从1995年开始实行的韩国质量革新计划(SinglePPM)运动是为了提高从合作企业纳入的产品质量。此项运动的目标是将包括成品不合格率和区域索赔的交货不合格率减少至10ppm以内或100ppm以下。至今,从韩国政府获得S-PPM认证的企业有1053家。这项质量革新计划不单纯是为提高产品质量,而且也为提高企业的信誉度做贡献。     

谈戴望舒诗歌的音乐性问题

对于一些新诗人古板地追求格律化而导致的弊端,戴望舒在他的诗论与创作中表现出了一位真正诗人的探索与思考.他去掉了古典诗歌的"格律"形式的束缚,以及新格律派诗歌过分注重的外在音乐美,提出了中国新诗的第三种节奏.这是新诗创作中音乐性不同方面的转变,是新诗音乐性的"内化".     

Development of a propulsion system for a biomimetic thruster

We studied theoretically and experimentally a biomimetic propulsion system inspired by the motility mechanisms of bacteria such as E. coli. Our goal was to investigate the effect of the "complex" filament of Rhizobium Meliloti bacteria on thrust force. The complex filament is a helically perturbed filament,similar to a plain filament threaded through a small helix. The propulsive performance of this system was estimated by modeling the dynamics of helical wave motion in viscous fluid. The model consists of a helical filament which is axially rotated at angular velocity ω. Resistive force theory(RFT) was applied to this model to calculate the thrust force and required torque. The Buckingham PI theorem(non-dimensional analysis) was also used to analyze the theoretical results. The procedure for making a complex filament with various pitch angles θs from a small helix and plain filament is explained in detail. To validate the theoretical results for helical wave propulsion and compare the characteristics of complex and plain filaments together,an experiment was performed to measure the thrust forces in silicone oil. The experimental results agreed with the theoretical values predicted by RFT. The thrust forces of complex filaments depended on the shape of small helix winding. The maximum thrust force was achieved at a small helix pitch angle of θs = 45°. In addition,we found that the thrust force generated by a complex filament had a value about 10% higher than that of a plain filament with the same equivalent diameter de.     

Development of a propulsion system for a biomimetic thruster

We studied theoretically and experimentally a biomimetic propulsion system inspired by the motility mechanisms of bacteria such as E. coli. Our goal was to investigate the effect of the ??complex?? filament of Rhizobium Meliloti bacteria on thrust force. The complex filament is a helically perturbed filament, similar to a plain filament threaded through a small helix. The propulsive performance of this system was estimated by modeling the dynamics of helical wave motion in viscous fluid. The model consists of a helical filament which is axially rotated at angular velocity ??. Resistive force theory (RFT) was applied to this model to calculate the thrust force and required torque. The Buckingham PI theorem (non-dimensional analysis) was also used to analyze the theoretical results. The procedure for making a complex filament with various pitch angles ?? _s from a small helix and plain filament is explained in detail. To validate the theoretical results for helical wave propulsion and compare the characteristics of complex and plain filaments together, an experiment was performed to measure the thrust forces in silicone oil. The experimental results agreed with the theoretical values predicted by RFT. The thrust forces of complex filaments depended on the shape of small helix winding. The maximum thrust force was achieved at a small helix pitch angle of ?? _s = 45°. In addition, we found that the thrust force generated by a complex filament had a value about 10% higher than that of a plain filament with the same equivalent diameter d _e .