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绿色混合数字计算机电源管理
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作者 Chun Cheung Weihong Qiu +2 位作者 Miller Greg jason lin Huang Yi 《今日电子》 2012年第10期48-52,共5页
图1所示的模拟电源解决方案是一种众所周知和经过实践检验的技术,功率电子工程师在时域中理解起来毫不费力。模拟PWM控制器包括一个误差放大器,用一些电阻和电容构成补偿网络。通过对电阻和电容值进行微调可实现最佳性能。模拟PWM控... 图1所示的模拟电源解决方案是一种众所周知和经过实践检验的技术,功率电子工程师在时域中理解起来毫不费力。模拟PWM控制器包括一个误差放大器,用一些电阻和电容构成补偿网络。通过对电阻和电容值进行微调可实现最佳性能。模拟PWM控制器提供快速和准确控制,人们开发了许多先进的模拟控制方案来实现最佳性能,特别是在瞬态要求非常严格的微处理器核心电源应用中。其针对核心及外设电源应用的简单性、易用性和低成本是无可替代的。 展开更多
关键词 电源管理 数字计算机 PWM控制器 模拟电源 混合 最佳性能 误差放大器 微处理器核
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Review of outcomes measures used to evaluate upper extremity surgical treatment of cervical spinal cord injury with recommendations for the future
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作者 jason lin Ida Fox 《Plastic and Aesthetic Research》 2024年第1期384-395,共12页
Cervical spinal cord injury is a life-altering event that profoundly affects an individual’s upper extremity function.Nerve transfer surgeries have been shown to restore more natural movement and fine motor control i... Cervical spinal cord injury is a life-altering event that profoundly affects an individual’s upper extremity function.Nerve transfer surgeries have been shown to restore more natural movement and fine motor control in this population.At present,there is no consensus on how to evaluate the efficacy of these restorative surgeries.The purpose of this work was to perform a comprehensive review of the existing literature and describe the outcome measures used.We hypothesized that the assessments will be heterogeneous across studies and will incompletely capture the effect of nerve transfers on upper extremity motion in cervical spinal cord injury.A search strategy was designed and a review of multiple databases(Embase.com,Ovid-Medline All,and Scopus)yielded 481 articles;26 unique studies met inclusion criteria and underwent analysis.Both manual muscle strength testing and video content were presented in the majority of studies.Outcome assessments including myometry,functional outcomes measures(such as the grasp and release test),patient-reported outcomes(including generic,extremity,and disease-specific types),and custom de novo questionnaires were used variably across studies.Future work should focus on standardizing outcomes measures in the field and developing and incorporating kinematic analysis to quantify the intricate,coordinated,and precise movement attained after nerve transfer surgery in the setting of cervical spinal cord injury. 展开更多
关键词 Nerve transfer surgery upper extremity function cervical spinal cord injury TETRAPLEGIA outcome assessments kinematic analysis
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