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基于双向脑机接口的癫痫抑制系统
Yu Qi, Fei-qiang Ma, Ting-ting Ge, Yue-ming Wang, Jun-ming Zhu, Jian-min Zhang, Xiao-xiang Zheng, Zhao-hui Wu
Front. Inform. Technol. Electron. Eng., 2014, 15(10): 839-847.
https://doi.org/10.1631/jzus.C1400152
研究目的:皮层电刺激作为新的治疗手段,能够有效抑制癫痫发作,弥补传统癫痫治疗方法的不足。现有电刺激治疗方法大都采用持续刺激的方式,或遵照既定的刺激方案,刺激量大,副作用强,尚未广泛应用于临床。脑机接口技术有望为电刺激治疗提供有效闭环控制,从而降低电刺激带来的组织损伤和副作用。 \n创新要点:首先,提出\"双阈值\"癫痫检测算法,针对癫痫脑电波形态特征,实现在线快速检测;其次,建立闭环脑机接口系统,通过反应性高频皮层刺激,有效抑制癫痫。 \n试验结果:通过建立双向脑机接口技术,对脑电信号进行实时分析,从而在癫痫发作前期将其准确检测出来,并触发反应性电刺激,有效抑制癫痫。在青霉素癫痫大鼠模型上的对照试验表明,基于癫痫脑电形态学特征的癫痫检测方法,癫痫检测率83%,平均检测延迟3.11秒;实验组相比于对照组,平均癫痫发作时间减少30.7%。 \n重要结论:通过双向闭环脑机接口系统,能够实现\"按需刺激\",从而大大降低电刺激量,减小副作用和组织损伤。基于脑机接口的反应性电刺激系统,能够对癫痫进行实时检测和刺激,有效抑制癫痫发作。该系统具有临床应用潜力。
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Advances in the control of mechatronic suspension systems
Wajdi S. Aboud, Sallehuddin Mohamed Haris, Yuzita Yaacob
Front. Inform. Technol. Electron. Eng., 2014, 15(10): 848-860.
https://doi.org/10.1631/jzus.C14a0027
The suspension system is a key element in motor vehicles. Advancements in electronics and microprocessor technology have led to the realization of mechatronic suspensions. Since its introduction in some production motorcars in the 1980s, it has remained an area which sees active research and development, and this will likely continue for many years to come. With the aim of identifying current trends and future focus areas, this paper presents a review on the state-of-the-art of mechatronic suspensions. First, some commonly used classifications of mechatronic suspensions are presented. This is followed by a discussion on some of the actuating mechanisms used to provide control action. A survey is then reported on the many types of control approaches, including look-ahead preview, predictive, fuzzy logic, proportional–integral–derivative (PID), optimal, robust, adaptive, robust adaptive, and switching control. In conclusion, hydraulic actuators are most commonly used, but they impose high power requirements, limiting practical realizations of active suspensions. Electromagnetic actuators are seen to hold the promise of lower power requirements, and rigorous research and development should be conducted to make them commercially usable. Current focus on control methods that are robust to suspension parameter variations also seems to produce limited performance improvements, and future control approaches should be adaptive to the changeable driving conditions.
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An advanced integrated framework for moving object tracking
Gwang-Min Choe, Tian-jiang Wang, Fang Liu, Chun-Hwa Choe, Hyo-Son So, Chol-Ung Pak
Front. Inform. Technol. Electron. Eng., 2014, 15(10): 861-877.
https://doi.org/10.1631/jzus.C1400006
This paper first introduces the concept of a geogram that captures richer features to represent the objects. The spatiogram contains some moments upon the coordinates of the pixels corresponding to each bin, while the geogram contains information about the perimeter of grouped regions in addition to features in the spatiogram. Then we consider that a convergence process of mean shift is divided into obvious dynamic and steady states, and introduce a hybrid technique of feature description, to control the convergence process. Also, we propose a spline resampling to control the balance between computational cost and accuracy of particle filtering. Finally, we propose a boosting-refining approach, which is boosting the particles positioned in the ill-posed condition instead of eliminating the ill-posed particles, to refine the particles. It enables the estimation of the object state to obtain high accuracy. Experimental results show that our approach has promising discriminative capability in comparison with the state-of-the-art approaches.
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12 articles
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