Browsing by Author "Lin, Tzu-Hsuan"

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Active 433 MHz-W UHF RF-powered chip integrated with a nanocomposite m-MWCNT/polypyrrole sensor for wireless monitoring of volatile anesthetic agent sevoflurane
(2008-01-15)
Chavali, Murthy
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Lin, Tzu-Hsuan
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Wu, Ren-Jang
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Luk, Hsiang-Ning
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Hung, Shih-Lin
Tiny remote sensors capable of monitoring gases and vapors are having greatest demand due to their potential applications in diverse research fields. In the present work, design and fabrication of an active wireless UHF (433 MHz) RF-powered sensing system for monitoring volatile organic compounds is presented. The developed sensor chip consists of a thin film of gas-responsive composite material, based on modified multiwalled carbon nanotubes (m-MWCNTs) and polypyrrole (Ppy), coated over two comb-like interdigitated gold electrodes. Wireless modules have been integrated with the chemical sensor chip (composite m-MWCNTs/Ppy) and RF components to detect volatile anesthetic agent, fluoromethyl 2,2,2,-trifluoro-1-(trifluoromethyl) ethyl ether (sevoflurane) is demonstrated. (c) 2007 Elsevier B.V. All rights reserved.
Development of an Internet of Civil Infrastructure Framework
(2013)
Liaw, Der-Cherng
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Lin, Tzu-Hsuan
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交大名義發表
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National Chiao Tung University
Nowadays, the civil infrastructures are subjected to disasters such as fires, floods, and earthquakes. Recently, the novel concept of Internet of Things (IoT) is known to be useful for managing crisis situations via providing a good disaster management and emergency response information. This paper addresses the civil infrastructure issue of health monitoring and disaster management by introducing IoT technology. A concept of interne of civil infrastructure (IoCI) framework is also proposed in this paper. The proposed framework is a three layered architecture. Among them, the top layer is a wireless sensor network (WSN) client which is deployed in civil infrastructure to perform specific tasks such as sensing, data processing, and acknowledgement. The middle layer is an information exchange web service (IEWS) through which all the information such as sensor data, structural health and location are exchanged, while the remaining layer is a mobile device based information platform for data representation, control, and event notification.
DEVELOPMENT OF WIRELESS SENSORS FOR RAPID DEPLOYMENT IN CIVIL INFRASTRUCTURES
(2007)
Lin, Tzu-Hsuan
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Hung, Shih-Lin
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Wen, Chun-Ming
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交大名義發表
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National Chiao Tung University
Buildings and civil infrastructures are frequently subjected to natural hazards such as earthquakes, typhoons, hurricanes and fires. Therefore, developing an efficient and robust monitoring system has become a most significant research area. Wireless Sensor Network (WSN) is a novel and attractive technology and has been an energetic research area in recent years. Furthermore, wireless sensor networks have developed several applications mainly to monitor hazardous environments. The bolt is ubiquitous in our life environment, such as buildings, bridges, railways and pipelines. Therefore, the new inspiration for developing a wireless sensor device, which is named "smart bolt", is proposed in this paper, which is to develop a wireless sensor device for rapid deploying. The prototype device is capable of wireless sensing via embedding the wireless sensor into a bolt, consisting of sensing and wireless communication modules. This paper introduces wireless technology and applications; moreover, it presents the prototype device design that includes hardware design and sensor integration. Experimental study was designed to investigate the benefit and efficiency of the proposed prototype and is finally shown in the paper to confirm the feasibility of a wireless sensor network in buildings and civil infrastructure.
Integrating a Hive Triangle Pattern with Subpixel Analysis for Noncontact Measurement of Structural Dynamic Response by Using a Novel Image Processing Scheme
(2014)
Lu, Yung-Chi
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Hung, Shih-Lin
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Lin, Tzu-Hsuan
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土木工程學系
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Department of Civil Engineering
This work presents a digital image processing approach with a unique hive triangle pattern by integrating subpixel analysis for noncontact measurement of structural dynamic response data. Feasibility of proposed approach is demonstrated based on numerical simulation of a photography experiment. According to those results, the measured time-history displacement of simulated image correlates well with the numerical solution. A small three-story frame is then mounted on a small shaker table, and a linear variation differential transformation (LVDT) is set on the second floor. Experimental results indicate that the relative error between data from LVDT and analyzed data from digital image correlation is below 0.007%, 0.0205 in terms of frequency and displacement, respectively. Additionally, the appropriate image block affects the estimation accuracy of the measurement system. Importantly, the proposed approach for evaluating pattern center and size is highly promising for use in assigning the adaptive block for a digital image correlation method.
Locating Damage Using Integrated Global-Local Approach with Wireless Sensing System and Single-Chip Impedance Measurement Device
(2014)
Lin, Tzu-Hsuan
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Lu, Yung-Chi
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Hung, Shih-Lin
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土木工程學系
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Department of Civil Engineering
This study developed an integrated global-local approach for locating damage on building structures. A damage detection approach with a novel embedded frequency response function damage index (NEFDI) was proposed and embedded in the Imote2.NET-based wireless structural health monitoring (SHM) system to locate global damage. Local damage is then identified using an electromechanical impedance-(EMI-) based damage detection method. The electromechanical impedance was measured using a single-chip impedance measurement device which has the advantages of small size, low cost, and portability. The feasibility of the proposed damage detection scheme was studied with reference to a numerical example of a six-storey shear plane frame structure and a small-scale experimental steel frame. Numerical and experimental analysis using the integrated global-local SHM approach reveals that, after NEFDI indicates the approximate location of a damaged area, the EMI-based damage detection approach can then identify the detailed damage location in the structure of the building.
Optimal Filtering Methods to Structural Damage Estimation under Ground Excitation
(2013)
Hsieh, Chien-Shu
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Liaw, Der-Cherng
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Lin, Tzu-Hsuan
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電機工程學系
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Department of Electrical and Computer Engineering
This paper considers the problem of shear building damage estimation subject to earthquake ground excitation using the Kalman filtering approach. The structural damage is assumed to take the form of reduced elemental stiffness. Two damage estimation algorithms are proposed: one is the multiple model approach via the optimal two-stage Kalman estimator (OTSKE), and the other is the robust two-stage Kalman filter (RTSKF), an unbiased minimum-variance filtering approach to determine the locations and extents of the damage stiffness. A numerical example of a six-storey shear plane frame structure subject to base excitation is used to illustrate the usefulness of the proposed results.
Towards Development of Wireless Sensor System for Monitoring Anesthetic Agents
(2010-12-01)
Lin, Tzu-Hsuan
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Hung, Shih-Lin
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Chavali, Murthy
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Wu, Ren-Jang
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Luk, Hsiang-Ning
In this paper, the design and development of sensing system for volatile anesthetic agent based on wireless sensor network is proposed. The proposed system include smart sensor chip fabricated by dip coating conducting polymer for sensing sevoflurane, the most commonly used inhalational anesthetic agent. This paper also discusses the total sensor system design including hardware design, software design and sensor integration. Present sensor system consists of both wireless sensing unit and a wireless receiving unit. The wireless sensing unit includes, sensing module, data acquisition module and wireless microprocessor module. The design of the wireless receiving unit includes two functional modules, a wireless microprocessor module and gateway. The experimental study was conducted to investigate the proposed prototype wireless sensor system. Results indicate the response of the sensor is rapid, and while returning to the initial level immediately after removal of the analyte. The response time T(90) (represents the time to 90% signal with the equilibrium signal) of 5.77% sevoflurane sensing curve is less than 60 s, and recovery time is also less than 60 S. This system has good potential application in monitoring indoor environments in hospitals and being anesthetic agent it is a challenge subject to study as well.