Browsing by Author "Wang, Chuan-Chi"

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Mechanism of Aluminum Induced Lateral Crystallization of Amorphous Silicon
(2010)
Huang, Shih-Yang
;
Wang, Chuan-Chi
;
Lin, Chih-Lung
;
Tsai, Yu-Lin
;
Chao, Cheun-Guang
The aluminium-induced lateral crystallization (AILC) of amorphous silicon (a-Si) on a glass substrate has been investigated. By means of a photoresist-based process, Al islands (100 nm) were thermally evaporated using 15 V, 3.5 A, and 25 V, 5.6A on the a-Si layer (100 nm), which was deposited on a glass substrate. SEM examinations indicated that the Al islands exhibited smooth and crystalline-grain morphology. Annealing processes were carried out at 748 and 823 K for various times. After annealing, AILC could be clearly observed in the crystalline-grain sample, but not in the smooth sample. TEM analyses showed that the mechanism of AILC resulted from two layer exchange processes. First, the Al islands exchanged with the underlying a-Si layer vertically during AIC, and then the generation of Al particles accompanying AIC caused a lateral layer exchange with the remaining a-Si layer with further annealing. (C) 2010 The Japan Society of Applied Physics
Untraceable Identity Management Framework for Mobile Access
(2008)
Kao, Min-Chih
;
Yeh, Yi-Shiung
;
Wang, Chuan-Chi
;
資訊工程學系
;
Department of Computer Science
Although some Extensible Authentication Protocol (EAP) methods such as EAP-TTLS (Tunneled Transport Layer Security) can hide true identity to protect the privacy of the mobile user, they cannot identify the mobile user for accounting and authorization purposes. The EAP framework lacks a mechanism to manage the relationship between true identities and pseudo identities. This study proposes an identity management framework based on the short-lived certificate so that the proposed scheme can deal with both authentication and authorization with privacy. The proposed scheme has no need of a certificate revoke scheme in which the authentication process can only occur between the mobile user and an authenticator. This greatly reduces the authentication delay. Thus, the proposed scheme can achieve both privacy and efficiency.