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We present a sub-mm3, fully wireless, implantable intraocular pressure monitor microsystem (IMM) that comprises a powering coil, an antenna, a piezoresistive micro-electro-mechanical system pressure sensor, and a pressure sensing IC. The system provides a 24-h intraocular pressure monitoring, which is not possible with currently used tonometric measurements. The IMM volume is limited to 0.38 mm3 (4...
Pedestrian detection is one of the key technologies of driver assistance system. In order to prevent potential collisions, pedestrians should be always accurately identified whether during the day or at night. Since the visual images of the night are not clear, this paper proposes a method for recognizing pedestrians by using a high-definition LIDAR without visual images. In order to handle the long-distance...
Glaucoma is an eye disease, where the elevated level of intraocular pressure (IOP) in the anterior chamber of the eye can damage the optic nerve causing irreversible blindness [1]. An IOP monitoring microsystem (IMM) implanted in the interior chamber of the eye is required to take frequent IOP measurements to account for its diurnal variation and dependency on the body posture, which is not possible...
In this paper, we design a medium access control (MAC) layer prootocol for wireless body area networks (WBANs) to cope with inter-WBAN interference. Each WBAN consists of a coordinator and multiple sensor nodes. Interference happens when multiple nodes transmit to their coordinators at the same time. To avoid interference among WBANs, carrier sensing multiple access with collision avoidance (CSMA/CA)...
In this paper, we present the prototype of our developed cylindrical interactive display, CINDY. It is an advanced version of our previous proposed omnidirectional display, Omni-Tube. In addition to the advantages of ease of use, low production cost, high portability and mobility that Omni-Tube possesses, CINDY greatly improves accuracy of the motion detection module and is able to give the users...
During the past decade, many companies have applied MEMS micromachining technique to the fabrication of miniature microphone such as Knowles SiSonicTM, Yamaha, Akustica, and Omron. In addition to the miniature volume, one major advantage that MEMS microphones is the capability of handling the heat produced during the reflow soldering processes on typical surface mount fabrication lines. However, most...
The IEEE 802.11e and the IEEE 802.11n focus on quality of service (QoS) and enhancements for high throughput respectively. Modern wireless LAN (WLAN) products should integrate both features. This paper presents a design of a high throughput MAC with QoS guarantee which combines the hybrid coordination function (HCF) of the 802.11e with the frame aggregation technique in the 802.11n. The basic idea...
In this study, a process modeling methodology applied in finite element (FE) analysis has been developed to investigate the evolution of residual stress during and after the CMOS-MEMS process. The MEMS (micro-electromechanical systems) capacitive microphone structure which contains a large membrane for sound sensing is selected to be studied, and it is fabricated using a standard foundry CMOS process...
Most of wireless sensor networks (WSN) research topics consider how to save the energy of the sensor nodes. However, in some applications of WSN, such as in the monitoring of an earthquake or forest wildfire, transmitting emergency data packets to the sink node as soon as possible is much more important than saving power. In this paper, we propose a Priority-based Hybrid Protocol (PHP) WSN model to...
There are some unresolved issues in classical hierarchical routing protocols for wireless sensor networks (WSN), In this paper, an energy-efficient multi-hop hierarchical routing protocol (EMHR) is proposed for WSN. Based on the energy strategy in the cluster head decision, the node of the largest surplus energy is selected to become the cluster head, which can effectively avoid the low-energy nodes...
Hierarchical routing protocols are critical for the wireless sensor networks (WSN) to maximize its lifetime, but the existing protocols are prone to lead nodes in clusters to die early due to ignoring the state of neighbors in the cluster head decision. In this paper, a new cluster-based optimization algorithm is set up which optimizes clustering process, to effectively avoid the low-energy and long-distance...
Most of wireless sensor network (WSN) research topics consider how to save the energy of the sensor node. However, in some WSN applications, such as in the monitoring of an earthquake or forest wildfire, transmitting emergency data packets to the sink node in time is much more important then saving power. In this letter, we propose a hybrid cluster-based (HC) WSN model. The HC WSN model provides a...
From the energy point of view, obtaining simultaneous blood pressure and flow rate of the radial artery at the wrist is very important for sphygmic diagnosis in medicine. This work depicts the conceptual design for a noninvasive multi-functional sphygmus detection system. According to Y. C. Fung's flow rate equation, flow rate is a function of the diameter of the blood vessel, two adjacent pressures,...
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