Browsing by Author "Chang, Chung-Huan"

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A Flexible Access Control Mechanism for Mobile Commerce
(2011)
Lo, Chi-Chun
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Huang, Chun-Chieh
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Chang, Chung-Huan
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資訊管理與財務金融系註：原資管所+財金所
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Department of Information Management and Finance
In this paper, we propose a flexible access control mechanism, which integrates domain information and confidence values, for mobile commerce. When user requests an access to the data server, the data server fetches and returns results according to the user's access right. Algorithms demonstrate the flexible access control is effective and flexible.
Label-free protein sensing by employing blue phase liquid crystal
(2017-03-01)
Lee, Mon-Juan
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Chang, Chung-Huan
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Lee, Wei
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光電學院
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College of Photonics
Blue phases (BPs) are mesophases existing between the isotropic and chiral nematic phases of liquid crystals (LCs). In recent years, blue phase LCs (BPLCs) have been extensively studied in the field of LC science and display technology. However, the application of BPLCs in biosensing has not been explored. In this study, a BPLC- based biosensing technology was developed for the detection and quantitation of bovine serum albumin (BSA). The sensing platform was constructed by assembling an empty cell with two glass slides coated with homeotropic alignment layers and with immobilized BSA atop. The LC cells were heated to isotropic phase and then allowed to cool down to and maintained at distinct BP temperatures for spectral measurements and texture observations. At BSA concentrations below 10(- 6) g/ ml, we observed that the Bragg reflection wavelength blueshifted with increasing concentration of BSA, suggesting that the BP is a potentially sensitive medium in the detection and quantitation of biomolecules. By using the BPLC at 37 degrees C and the same polymorphic material in the smectic A phase at 20 degrees C, two linear correlations were established for logarithmic BSA concentrations ranging from 10(- 9) to 10(- 6) g/ ml and from 10(- 6) to 10(- 3) g/ ml. Our results demonstrate the potential of BPLCs in biosensing and quantitative analysis of biomolecules. (C) 2017 Optical Society of America