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Search Results: 1 - 10 of 83493 matches for " Yu-Hui Ching "
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Microblogging for Strengthening a Virtual Learning Community in an Online Course
Yu-Chang Hsu,Yu-Hui Ching
Knowledge Management & E-Learning : an International Journal , 2011,
Abstract: This paper examines how a microblogging tool (i.e., Twitter) can be effectively used to strengthen a virtual learning community (VLC) in the two sections of a fully online graduate course. Students in this course were consisted of K-12 teachers, school technology specialists, corporate trainers, and military personnel. The microblogging activities were designed to allow quick peer interaction to build the momentum of social learning in the VLC. In this study, we collected quantitative data on sense of community through a Likert scale survey, and rich qualitative data on students’ perception about microblogging activities. It was found that students’ sense of community was generally high and students were positive about their microblogging experiences. In addition, microblogging was found to be useful and valuable in sustaining students’ learning by doing such as sharing real-world design examples, critiquing design examples with technical knowledge learned in class, and quick and short commenting with peer support in a VLC. Based on the findings, the authors aim to provide design suggestions for educators and instructional designers to incorporate this social web tool in strengthening virtual learning communities in a meaningful and engaging way.
Mobile Microblogging: Using Twitter and Mobile Devices in an Online Course to Promote Learning in Authentic Contexts
Yu-Chang Hsu,Yu-Hui Ching
International Review of Research in Open and Distance Learning , 2012,
Abstract: This research applied a mixed-method design to explore how best to promote learning in authentic contexts in an online graduate course in instructional message design. The students used Twitter apps on their mobile devices to collect, share, and comment on authentic design examples found in their daily lives. The data sources included tweets (i.e., postings on Twitter), students’ perceptions about mobile microblogging activities, and self-reported Twitter usage. Based on the tweet analysis, we found that the students appropriately applied the design principles and design terms in their critique of design examples. While the students were mainly engaged in assignment-relevant activities, they spontaneously generated social tweets as they related peers’ authentic design examples to their own life experiences. Overall, they had positive perceptions toward the mobile microblogging activities. The students also indicated that the design examples shared by peers through mobile microblogging inspired their own message design work. We synthesized instructional design suggestions and challenges for educators interested in incorporating mobile microblogging in their instructional settings.
Application of Schema Theory in Teaching College English Reading
Yu-hui Liu
Canadian Social Science , 2010,
Abstract: The paper first introduces three models of reading comprehension theory: Bottom-up Model, Top-down Model and Interactive Model, and then discusses in detail the schema theory based on interactive model. Three types of schema theory ——language schema, content schema and form schema are introduced and their different functions in teaching college English reading are discussed with sufficient teaching practice. Key words: reading comprehension; schema theory; reading ability Résumé: Tout d’abord, l'article présente trois premiers modèles de la théorie de compréhension en lecture: modèle bas-haut, modèle haut-bas et modèle interactif, et ensuite il discute en détail la théorie des schémas basée sur le modèle interactif.Trois types de théorie des schémas - schéma de la langue, schéma du contenu et schéma de la forme sont introduites et leurs fonctions différentes dans l'enseignement de la lecture en anglais dans les collèges sont discutées avec une pratique pédagogique suffisante. Mots-Clés: compréhension en lecture, théorie des schémas, capacité de lecture
Innovation Effect on Patent Pool Formation:Empirical Case of Philips’ Patents in Digital Versatile Disc 3C
Yu-Hui Wang,Benjamin Liu
International Journal of Automation and Smart Technology , 2013, DOI: 10.5875/ausmt.v3i3.176
Abstract: The aim of this paper is to understand the evolution of a patent pool over time, focusing on an individual firm. The legitimacy of patent pools requires a careful balance between innovation incentives, anti-competitive possibilities and consumer surpluses. Thus, it is an empirically important issue whether a patent pool continues to maintain this carefully struck balance even as the mix of its patent assets continues to evolve. The particular focus of this study is to examine the quality and quantity of Phillips’ patent holdings within the DVD 3C patent pool in order to understand the extent of the firm’s innovation within that patent pool over its lifetime, measured by four indicators that previous scholars have linked to the notion of patent quality. The result shows that, while the four indicators of patent quality varied, they together reveal that the breadth of exclusivity expanded significantly during the life of the patent pool, but that this expansion represented little innovative activity. Most of the patents issued post-formation are extensions of patents granted before pool-formation.
Metabolomic Studies Using High Performance Liquid Chromatography and Tandem Mass Spectrometry to Discover Quality Markers for Oriental Beauty (Dongfang Meiren) Tea  [PDF]
Yi-Hong Chen, Yu-Hui Liu, Yi-Jhen Wu, Chu-Chin Chen
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.59092

In this study, a high-performance liquid chromatograph and an electrospray ionization (ESI) triple quadrupole mass spectrometry (TQ MS) detector were used to scan Oriental Beauty tea of different grades and prices. Principle component analysis (PCA) of the profiling data was performed for pattern recognition, clearly showing that the proposed MS profiling method was able to classify Oriental Beauty tea into different grades. The component mass ions primarily responsible for the separation were selected with high loading strength in the PCA for subsequent identification with tandem mass (MS/MS). Caffeine, citrate and salicylate were verified, whereas certain other compounds remained ambiguous. Regression analysis considering caffeine, citrate and salicylate showed a linear relationship between the prices of the Oriental Beauty tea with an adjusted R2 of 0.84. If all the selected marker ions (in addition to caffeine, citrate and salicylate) could have been identified and incorporated into regression analysis, a stronger relationship could have been confirmed. These results suggest that metabolomics can facilitate the determination of real markers in the quality control of Oriental Beauty tea, and may lead to the further application of metabolomics in other food quality controls.

Secondary succession of earthworm population in high production agro-ecosystem in North China

QIAO Yu-Hui,

生态学报 , 2004,
Abstract: The study was conducted in Huantai County Shandong Province in North China to study the secondary succession of earthworm population under low and high soil fertility in agro-ecosystem. The result shows that seven species were found both in two agro-ecosystems, but the earthworm population density and composition are different, the average earthworm population in the high fertility soil is relatively abundance, the population density is 83.83 in./m~2. Among the seven earthworm species, Aporrectae trapezoids is the dominant species. While in the low fertility soil, the population density is 40.18 ind./m~2 and Drawida gisti is the dominant species. Comparing the density of each earthworm species in the two kinds of soil fertility agro-ecosystems, the density of Aporrectae trapezoids and Amynthas hupeiensis is significantly higher in the high fertility soil than that in the low fertility soil, while the difference of other five species is not obvious. This result shows that with the succession of the soil fertility, the earthworm also has a process of succession; the abundance species in the low fertility agro-ecosystem Drawida gisti is gradually substituted by Aporrectae trapezoids in the high fertility agro-ecosystem. One-year experiment was also conducted to study the impact of the organic input on earthworm population and succession. The result shows that with the increase of the organic input, the earthworm population density is increasing, the earthworm density of the treatments has the following ascending trend: Chemical fertilizer
Effects of Bisphenol A on apoptosis of spermatogenic cells and expression of Bax and Bcl-2 proteins in the Siberian frog Rana chensinensis
LIN Sheng-Nan,ZHANG Yu-Hui
Acta Zoologica Sinica , 2008,
Abstract: In order to investigate the effects of bisphenol A (BPA) on apoptosis and the expression levels of Bax and Bcl-2 protein in amphibian spermatogenic cells, we treated Rana chensinensis with concentrations of 10-7, 10-6, 10-5mol/L BPA respectively. Testes were removed after R.chensinensis had been treated for 3 , 5 or 7 days. Apoptotic cells were examined by TUNEL and Methyl Green-Pyronine. The expression levels of Bax and Bcl-2 protein in spermatogenic cells were detected by immunohistochemical staining. The results show that apoptotic index (AI)of spermatogenic cells of R.chensinensis treated with BPA is significantly higher than that of the control groups. AI of spermatogenic cells in 10-6 and 10-7 mol/L BPA groups are similar (P>0.05), but AI in 10-5 mol/L is significantly higher than that of in 10-6 and 10-7 mol/L BPA groups (P<0.05). AI of spermatogenic cells increases with prolonged treatment. The relative intensity of Bax immunostaining in BPA treated groups is higher than that of control groups (P<0.05) while the relative intensity of Bcl-2 in BPA treated groups is lower than that of control groups (P<0.05). Positive correlations exist between the AI of spermatogenic cells and the expression ratio of Bax/Bcl-2. These results indicate that BPA can enhance the apoptosis of spermatogenic cells in R.chensinensis, and that the change of the expression ratio of Bax /Bcl-2 might have caused the increased apoptosis of spermatogenic cells in BPA treated R. chensinensis [Acta Zoologica Sinica 54(5): 867–876, 2008].
Research on Community Evolution Discovery Based on Clique Percolation
YAN Yan,HUANG Zhi-xing,QIU Yu-hui
Journal of Chongqing Normal University , 2009,
Abstract: Clique percolation method has been used in many cases for discovering overlapping communities. However, its result is largely affected by parameters; as community size or cohesion changes the parameters needed shift accordingly. To overcome the dependency on parameters, in this paper we propose an approach for community evolution discovery based on community tree constructed by clique percolation. A community tree provides a hierarchical structure of communities discovered under a range of parameters in a given network; related community states can be found by searching a series of community trees thus the life span of a community can be discovered. We apply it to the word association network from DBLP data set and analyze how each community evolves. The outcome shows that this approach can effectively discover the community evolution process and identify the changes in size, membership and intensity. It's also observed that communities of different size have different evolving characteristic features.
A magneto-optic modulator with unit quantum effciency
Lewis A. Williamson,Yu-Hui Chen,Jevon J. Longdell
Physics , 2014, DOI: 10.1103/PhysRevLett.113.203601
Abstract: We propose a device for the reversible and quiet conversion of microwave photons to optical sideband photons, that can reach 100% quantum effciency. The device is based on an erbium doped crystal placed in both an optical and microwave resonator. We show that effcient conversion can be achieved so long as the product of the optical and microwave cooperativity factors can be made large. We argue achieving this regime is feasible with current technology and we discuss a possible implementation.
Unified representation of formulas for single birth processes
Mu-Fa Chen,Yu-Hui Zhang
Mathematics , 2014,
Abstract: Based on a new explicit representation of the solution to the Poisson equation with respect to single birth processes, the unified treatment for various criteria on classical problems (including uniqueness, recurrence, ergodicity, exponential ergodicity, strong ergodicity, as well as extinction probability etc.) for the processes are presented.
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