Investigation of blood pulse PPG signal regulation on toe effect of body posture and lower limb height

Objective: To study the regulation of blood pulse volume via photoplethysmography (PPG) signal detected from toe, while the lower limb is passively raised in different height positions. Methods: Use a modified non-invasive PPG technique to detect the blood pulse signal on toe with infrared (IR) photo sensor. A protocol consisting of two postures, i.e., supine and 45° reclining, was designed to conduct laboratory trial in this study. During the period of performing the protocol of these postures, the lower limb was passively raised from the heights of 10 cm to 60 cm randomly and individually with sponge blocks underneath the foot. Results: In the supine posture, the higher the foot was passively raised, the more the blood PPG signal decreased. In the 45° reclining posture, the blood PPG signal increased at the beginning and then decreased in the foot height position from 10 cm to 60 cm. In both postures the normalized AC signal changes significantly while the normalized DC signal changes little. Conclusion: The toe PPG signals can obviously indicate the regulated blood volume change with the designated postural procedures due to the heart level position.     

基于供应链控制的PPG运营模式分析

PPG运营模式是一种新的服装企业运营模式,从产品选择、库存、定价分析等供应链控制方面对运营模式进行分析,并提出这种新模式需要解决的问题．     

基于PPG成长战略的优劣势分析

2007年,网络直销品牌PPG在服装行业掀起了一场颠履传统商业模式的革命,成为当年最为商界学者所关注的企业之一.文章从中小企业成长战略角度出发,针对PPG成长过程中竞争战略的选择与运用进行优劣势分析,并试图找寻出能够为我国中小企业成长所借鉴的成功经验.     

从PPG模式看B2C的崛起

“B2C”、“网上直销”这些曾一度沉寂的名词在2007年再度被人们提起,在B2C模式的背后涌现了一批象PPG一样的践行者。而论2007年国内服装行业的风云企业,PPG则可以被称为服装业的一匹黑马,PPG的成功无疑将成为业界讨论的焦点。本文从PPG的商业模式着手,透过PPG等“轻资产”企业的竞争力分析说明B2C这一曾经风光无限的电子商务模式正重新焕发新的光彩。