Browsing by Author "Lin, Chen-Yi"

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Live Streaming Channel Recommendation Using HITS Algorithm
(2015)
Liu, Yu-Wen
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Lin, Chen-Yi
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Huang, Jiun-Long
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資訊工程學系
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網路工程研究所
Live streaming services have been developed prosperously in recent years. With live streaming services, broadcasters broadcast their videos to attract large numbers of viewers to watch. Some live streaming services also provide a platform for viewers gathering together to watch channels and interact with others. Over hundreds of videos broadcast every day, recommending channels are necessary to help viewers finding channels of interests. In this paper, we propose the hybrid HITS algorithm for Channel Recommendation (HyHITS_CR) which adopts the HITS algorithm with modification to utilize the follower-followee relationship on channel recommendation. Besides, we also observe from real logs that some viewers may focus on few particular channels. Thus, HyHITS_CR also takes advantage on such observation to further improve the accuracy of recommendation. Experimental results show that the hit rate of HyHITS_CR is around 10% higher than other prior algorithms.
Personalized channel recommendation on live streaming platforms
(2019-01-01)
Lin, Chen-Yi
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Chen, Han-Shen
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資訊工程學系
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Department of Computer Science
With unceasing technological advancements, an increasing number of viewers are watching channels through live streaming platforms, and live streaming technologies are developing rapidly. However, as thousands of channels are broadcasting on live streaming platforms, it is difficult for viewers to find their favorite channels. As a result, an accurate channel recommendation technique is required for the viewers. The current method of promoting live streaming channels recommends the most popular channels to viewers, but this ignores viewers' personal preferences. Therefore, we cluster viewers based on their personal preferences so that one cluster of viewers contains the viewers with similar favorite channels. In this way, the channels liked by viewers can be recommended to other viewers in the same group. In addition, our recommendation technique also considers viewers' loyalty towards a particular channel. In the experiment, a currently popular live streaming gaming platform, Twitch, is used for the analysis. The results confirm that our proposed recommendation technique is more accurate than the existing recommendation techniques.
RcsB regulation of the YfdX-mediated acid stress response in Klebsiella pneumoniae CG43S3
(2019-02-28)
Liu, Chia-Jui
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Lin, Ching-Ting
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Chiang, Jo-Di
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Lin, Chen-Yi
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Tay, Yen-Xi
In Klebsiella pneumoniae CG43S3, deletion of the response regulator gene rcsB reduced the capsular polysaccharide amount and survival on exposure to acid stress. A comparison of the pH 4.4-induced proteomes between CG43S3 and CG43S3.rcsB revealed numerous differentially expressed proteins and one of them, YfdX, which has recently been reported as a periplasmic protein, was absent in CG43S3.rcsB. Acid survival analysis was then conducted to determine its role in the acid stress response. Deletion of yfdX increased the sensitivity of K. pneumoniae CG43S3 to a pH of 2.5, and transforming the mutant with a plasmid carrying yfdX restored the acid resistance (AR) levels. In addition, the effect of yfdX deletion was cross-complemented by the expression of the periplasmic chaperone HdeA. Furthermore, the purified recombinant protein YfdX reduced the acid-induced protein aggregation, suggesting that YfdX as well as HdeA functions as a chaperone. The following promoter activity measurement revealed that rcsB deletion reduced the expression of yfdX after the bacteria were subjected to pH 4.4 adaptation. Western blot analysis also revealed that YfdX production was inhibited by rcsB deletion and only the plasmid expressing RcsB or the nonphosphorylated form of RcsB, RcsBD56A, could restore the YfdX production, and the RcsB-mediated complementation was no longer observed when the sensor kinase RcsD gene was deleted. In conclusion, this is the first study demonstrating that YfdX may be involved in the acid stress response as a periplasmic chaperone and that RcsB positively regulates the acid stress response partly through activation of yfdX expression. Moreover, the phosphorylation status of RcsB may affect the YfdX expression under acidic conditions.