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This paper presents a 16-channel closed-loop neuromodulation SoC for human seizure control. The SoC includes a 16-ch signal acquisition unit, a bio-signal processor, a 16-ch adaptive stimulator, and wireless telemetry. The signal acquisition unit achieves 3.78 NEF and shares electrodes with stimulator. The seizure detection latency is 0.76s and delivered 0.5–3mA biphasic current stimulation. The SoC...
Based on the characteristics of the wireless sensor networks, a middleware layer for quality of service support was proposed. For kinds of user's QoS requirements, tasks of network were scheduled by collecting and updating local information continuously, and the reliability of network was enhanced by redundancy. Results of simulation show that the middleware mechanism can not only meet the user QoS...
A 7-bit 26MS/s SAR (successive approximation register) ADC is presented in this paper for the application of ZigBee receiver. Compared to the conventional method, the set-and-down method reduces the average switching energy by around 80%. Dynamic comparator is chosen to diminish the signal-dependent offset caused by the non-fixed input common-mode voltage. A prototype ADC was implemented in a CMOS...
Security key management is the most basic requirement for wireless sensor networks security. In this paper, we propose a dynamic key management scheme for large-scale clustering wireless sensor networks based on improved EBS. We use two one-way hash chains for nodes registration and verification, take half-symmetric t-degree trivariate polynomial keys to replace the original keys used in EBS, and...
Broadcast is very important for delivering messages in wireless sensor networks. In order to improve the efficiency of broadcast and reduce energy consumption, it is necessary to construct a virtual backbone within the entire network. Constructing a virtual backbone is identical with calculating connected dominating set. 1-hop neighbor node transmission coverage information is used to calculate the...
Dynamic event region detection is an important application of wireless sensor networks. The position of event region should be transmitted to the base station in good time. A routing scheme based on gradient field and cluster is advised to track dynamic event region. The gradient field is set up after sensors are deployed. Only the event sensors are organized into clusters and then the cluster heads...
Global milk production shows a positive trend and cow milk production increased greatly. The dairy industry requires milk with high standards of quality in all stages of milk production and milk processing, and a very important parameter that influences these quality aspects most is the milk temperature. In this paper we present a sensor network based milk temperature monitoring system, because of...
Key establishment in sensor networks is a challenging problem for the constrained energy, memory, and computational capabilities of the sensor nodes. In this paper, focusing on the management of encryption keys in clustered WSNs, We propose a novel distributed key management scheme based on Shamir secret sharing scheme and deployment knowledge(KMSGC). In KMSGC, the sensor nodes are divided into some...
Routing algorithm problem is one of the major issues to be resolved in wireless sensor network research. This article analyses the best hop routing algorithms which based on the limitations presented of the minimum-hop routing algorithms fully into the wireless sensor network's energy and load to achieve balance in all the optimum network routing. It is certain that the achievement of our research...
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