Browsing by Author "Chen, Tien-Ho"

Now showing 1 - 4 of 4

A Novel Near-Infrared Array Based Arterial Pulse Wave Measurement Method
(2013)
Huang, Wei-Chin
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Hou, Hsiang-Wen
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Cheng, Ching-Ju
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Wu, Shih-Yang
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Chen, Tien-Ho
Recently there have been many studies regarding pulse wave velocity (PWV) produced by near-infrared light. However, these studies have used multiple probes with the synchronization problem. This paper proposed a new detecting method to measure PWV on a radial artery with multiple channels in one front-end sensor array. The system was implemented on a MSP430F169 platform and the PWV result was transmitted by RS232 and displayed on the computer screen after being processed. Finally, the PWV result was measured to validate the functionality of the system.
A Portable 2-D Oximeter Image System Design for Breast Foreign Tissue Detection
(2012)
Cheng, Ching-Ju
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Wu, Shih-Yang
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Kang, Shih
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Chen, Tien-Ho
;
Fang, Wai-Chi
Many studies of two dimensional (2D) oxygen saturation distribution reconstruction have recently been conducted. However, these studies use powerful computers or large mainframes which are impractical for home health care systems. This paper proposes a 2D, portable, low-cost, real-time oxygen saturation distribution reconstruction system to detect breast cancer, making early detection possible. The system is implemented on FPGA with front-end sensors and display devices. The functionality of the system is verified using a phantom which presents breast tissue.
A SoC Design for Portable 2-Dimension Oximeter Image System
(2012)
Cheng, Ching-Ju
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Wu, Shih-Yang
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Kang, Shih
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Chen, Tien-Ho
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Fang, Wai-Chi
In recent years, many studies of 2-D oxygen saturation distribution reconstruction have provided easy access to human brain activity regions. However, only a few research focus on the home health care system using this technique. In this paper, we proposed a portable, low cost and real-time distribution reconstruction system of oxygen saturation in 2-D to make diagnosis at home possible. The system has been implemented in hardware as an oxygen saturation processor and verified on Field Programmable Gate Array (FPGA). Furthermore, we also introduce an image post processing unit to enhance the reconstruction result. Finally, we show that our system can recognize the variation of oxygen saturation region with high precision in detection tissue.
Three-tier authentication scheme using smart card
(2012-03-01)
Chen, Tien-Ho
;
Fang, Wai-Chi
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Kang, Shih
;
Kim, Tai-hoon
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電子工程學系及電子研究所
With current network technologies, various business activities can be done in the Internet world, and how to assure the security of these activities in an insecure communication channel becomes the most important issue. Recently, Hsiang-Shih proposed a remote user authentication scheme for multi-server environment as an improved scheme over Liao and Wang's scheme, and asserted that their scheme can escape from masquerade attack, server spoofing attack, etc. In this paper, we show that Hsiang and Shih's scheme still suffers from masquerade attack. To mend the problem, we offer a three-tier authentication using smart card procedure with dynamic ID and Diffie-Hellman's method to improve Hsiang- Shih's insecure scheme. Our scheme is suitable for applications with higher security requirement.