Browsing by Author "Lin, Ching-Yu"

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Context-Aware Services for Mobile Multimedia Application
(2015-07-01)
Kung, Hsu-Yang
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Chen, Chi-Hua
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Lin, Ching-Yu
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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
Advancements are rapidly being made in mobile computing environments and context aware multimedia streaming services that are based on information about a user\'s context. This work proposes a Context-Aware Embedded Multimedia Presentation System (CEMP) that is based on the context vocabulary ontology to provide a formal explicit description of the multimedia information domain and the formal context process model. The designed context recognition and context representation reasoning mechanism can perform context classification to deliver multimedia services of the required quality. Additionally, the CEMP system includes an adaptation reasoning mechanism that identifies the best adaptation control when the context changes. However, context modification may cause a context conflict problem among multiple adaptation requirements and resource limitations. The CEMP system provides a conflict resolution mechanism that calculates the context\'s priority and the context weight to improve context conflict resolution results.
Neighboring-Group Participation by C-2 Ether Functions in Glycosylations Directed by Nitrile Solvents
(2011-10-01)
Chao, Chin-Sheng
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Lin, Ching-Yu
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Mulani, Shaheen
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Hung, Wei-Cheng
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Mong, Kwok-kong Tony
Ether-protecting functions at C-2 hydroxy groups have been found to play participating roles in glycosylations when the reactions are conducted in nitrile solvent mixtures. The participation mechanism is based on intramolecular interaction between the lone electron pair of the oxygen atom of the C-2 ether function and the nitrile molecule when they are positioned in a cis configuration. A 1,2-cis glycosyl oxazolinium intermediate is formed. This participation, in conjunction with the anomeric effect of the glycosyl donor, confers high 1,2-trans selectivities on glycosylations. Further application of this concept has led to efficient preparations of alpha-(1 -> 5)-arabinan oligomers.