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Your search keyword '"Jan, Jinn-Ke"' showing total 89 results
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89 results on '"Jan, Jinn-Ke"'

70. Two Phased Decompression Scheme for Quality Improvement of Vector Quantized Images.

Author

Jan, Jinn-Ke, Shen, Jau-Ji, and Yeh, Chun-Hsiu

Abstract

With the development of the cloud virtual environment, a lot of storage space to store the user's image files is looking forward in the future. in this study, we hope to use the user already owned image database to enhance the quality of a VQ decompressed image which is received its index table by the user from internet. the major idea is to set an indexing structure for all of the images in database. the indexing structure is established according to the VQ codebook such that image blocks (in size 4x4 as usual) will be linked with the same codeword if this codeword is their most similar codeword in the VQ codebook. All the blocks were clustered into groups in accordance with the same index value of codeword, any compressed block using the same codeword will correspond to a clustered group to find more suitable block to restore this image block. the experimental results showed that our method can restore the decompressed images in better quality from the same index table as the conventional VQ decompression. [ABSTRACT FROM PUBLISHER]

Published
2012
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87. On the Security of Methods for Protecting Password Transmission

Author

Tseng, Yuh-Min, Jan, Jinn-Ke, and Chien, Hung-Yu

Abstract

Peyravian and Zunic (2000) proposed a password transmission scheme and a password change scheme over an insecure network. Their proposed solutions do not require the use of any symmetric-key or public-key cryptosystems. However, this article points out that their schemes have several security flaws for practical applications. A slight improvement on their schemes is proposed in this paper to remove the security flaws.

Published
2001
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88. A scheme and concept for limited inheritance of privileges in a user hierarchy.

Author

Tseng, Yuh-Min and Jan, Jinn-Ke

Subjects
*HIERARCHIES, *USER interfaces
Abstract

Proposes a user privilege hierarchy to represent the policy that a user only inherits partial privileges from other users who are below him in a user hierarchy. Method of deriving the relationships and the inheritable privileges among users in a user privilege hierarchy; Algorithms for checking an inheritable privilege between two users; Performance of the scheme; Conclusions.

Published
1998
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