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1.
Eun-hye Park Won-young Bae Jae-yeon Kim Kee-tae Kim Hyun-dong Paik 《Journal of Zhejiang University. Science. B》2017,18(9):816-824
The inhibitory effects of Lactobacillus plantarum-fermented and non-fermented Inula britannica extracts on the tyrosinase activity were comparatively investigated to examine whether and how they improve the whitening activity, and the contents of total flavonoids and polyphenolics as bioactive compounds were determined. The skin whitening activity using in vitro or ex vivo tyrosinase and L-3,4-dihydroxyphenylalanine (L-DOPA) staining was examined. The total flavonoid content (TFC) was increased by 13.4% after 72 h-fermentation. The viabilities of the B16F10 cells treated with the fermented and non-fermented control extracts were 100.26% and 92.15% at 500 μg/ml, respectively. In addition, the inhibition of tyrosinase activity was increased by the fermented samples from 29.33% to 41.74% following fermentation for up to 72 h. The tyrosinase activity of the untreated control group was increased to 145.69% in B16F10 cells. The results showed that I. britannica fermented by L. plantarum dose-dependently inhibited tyrosinase activity, which was stimulated by α-melanocyte stimulating hormone. These results suggest that lactic fermented I. britannica extracts can be used as effective skin-whitening materials. 相似文献
2.
Jeong Soojeong Elliott Jennifer B. Feng Zhang Feldon David F. 《Journal of Science Education and Technology》2022,31(5):691-705
Journal of Science Education and Technology - The properties and functions of complex systems apply across a variety of domains of science and are at the heart of the solutions to many global... 相似文献
3.
Two experiments tested the claim that the transparency of Korean fraction names promotes fraction concepts (Miura, Okamoto, Vlahovic-Stetic, Kim, & Han, 1999). In Experiment 1, U.S. and Korean first and second graders made similar errors on a fraction-identification task, by treating fractions as whole numbers. Contrary to previous findings, Korean children performed at chance when a whole-number representation was included. Nonetheless, Korean children outperformed their U.S. peers overall. In Experiment 2, U.S. children's performance improved when fraction names were used that explicitly referred to part-whole relations like Korean fraction names. U.S. children's scores actually exceeded those of Korean children. Thus, although the differences in fraction names may influence children's performance, this may not account for the reported cross-national differences. 相似文献
4.
From the theoretical perspectives of communication accommodation and intergroup contact, this study examined South Korean young adults’ (N?=?301) perceptions of their communication experiences with a frequently-contacted grandparent, as well as attitudes toward older adults and own aging. Findings from structural equation modeling indicated that the participants’ attitudes towards older adults were positively predicted by contact frequency with the grandparent and negatively predicted by perceptions of the grandparent’s non-accommodative communication. Analyses of indirect effects revealed that young adults’ intergroup anxiety explained these associations. Although the direct effects of contact frequency and the grandparent’s non-accommodation on attitudes toward own aging were nonsignificant, the indirect effects through intergroup anxiety were significant. Moderation analysis indicated that these direct and indirect associations between non-accommodation and aging attitudes were significant only when age salience was low – a finding contrary to existing theory and research. Results are discussed in terms of intergenerational communication and culture, and theories of intergroup contact. 相似文献
5.
To study deception, participants were randomly assigned the role of allocator or recipient in an ultimatum negotiation game. Allocators “earned” 7 dollars and divided the money between themselves and recipient and communicated the decision either face-to-face or through text chat. Recipients were unaware the amount the allocator had, and therefore, allocators could deceive. Most allocators used deception. We hypothesized that participants who self-identified as good liars would communicate more face-to-face than through text chat when deceiving, and this was supported for deceptive omission but not fabrications. Good liars were more likely to have their truths correctly detected than bad liars. 相似文献
6.
“Science Talks” in Kindergarten Classrooms: Improving Classroom Practice Through Collaborative Action Research 总被引：1，自引：0，他引：1
Meilan Zhang Susan Passalacqua Mary Lundeberg Matthew J. Koehler Jan Eberhardt Joyce Parker Mark Urban-Lurain Tianyi Zhang Sunhee Paik 《Journal of Science Teacher Education》2010,21(2):161-179
In this study we described an action research project enacted by a veteran Kindergarten teacher (Sarah) in the context of
a professional development program. Over the course of a year, Sarah collaborated with other teachers in a small group to
investigate how to use “Science Talks” to promote student learning in Kindergarten classrooms. A Problem-Based Learning approach
was adopted to guide the collaborative action research. Based on a rich set of data sources, we concluded that Sarah’s action
research improved student learning and led to her own professional growth. We also identified important conditions in support
of action research. 相似文献
7.
Tables in documents are a widely-available and rich source of information, but not yet well-utilised computationally because of the difficulty in automatically extracting their structure and data content. There has been a plethora of systems proposed to solve the problem, but current methods present low usability and accuracy and lack precision in detecting data from diverse layouts. We propose a component-based design and implementation of table processing concepts which can offer flexibility and re-usability as well as high performance on a wide range of table types. In this paper, we describe a system named TEXUS which is a fully automated table processing system that takes a PDF document and detects tables in a layout independent manner. We introduce TEXUS’s own table processing specific document model and the two-phased processing pipeline design. Through an extensive evaluation on a dataset comprised of complex financial tables, we show the performance of the system on different table types. 相似文献
8.
The aim of the present study is to shed light on the conceptions that young students have of heat and temperature, concepts that are both important in school science curricula and closely related to daily life. The subjects of the study were students from a rural district in South Korea and they ranged in age from 4 to 11 years. Interviews were conducted with each student on the basis of questions on temperature, thermal insulation, and heat equilibrium. After calculating the frequency and percentage of student responses and analyzing the rationale for their answers, it was found that younger students tended to view temperature as “size” or a “summation of numbers.” This tendency gradually diminished in older students. Most students had alternative conceptions of thermal insulation regardless of age; however, reasoning differed according to age. Younger students displayed a greater tendency to view insulation as a material property, whereas older students showed a greater tendency toward rational heat and temperature conceptions. Most students did not have clear concepts of heat equilibrium regardless of age, but possessed numerous alternative conceptions. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 44: 284–302, 2007 相似文献
9.
Paik Wondam 《Inter-Asia Cultural Studies》2016,17(1):148-157
The 60th anniversary of the Bandung Conference adopted the Bandung Message 2015, suggesting Asia and Africa be committed to eradicating poverty, narrowing the gap in living standards, and fostering closer cooperation across the regions. Whilst the historic 1955 Bandung Conference can be understood as a reaction to the Cold War system in the form of an alternative framework for cooperation among nations that resisted the hegemony of economic and military alliances dominated by specific countries, present day Asia witnesses significant attempts to reshuffle the world order; such as the Asia-Pacific system and China's “One Belt One Road” project. Equally, there are also signs of a determination towards openness and to cross boundaries in a spatial sense that may lead to the reshuffling of both institutions and everyday lives. These attempts are aimed at realizing a different Asia and a different world, rather than becoming part of a world order led by a specific country. The “people” of Asia have experienced colonization and forced emigration, drifting around the region while, at the same time, fleeing from one place to another, resulting in numerous interactions with diverse social systems and cultures. In this process they have shaped new spaces, places and social relations within the shifting landscapes of imperialism, the Cold War and globalization. These could be defined as a “historicized Asia” in which various movements, ruptures and hostilities generated by imperialism and the Cold War overlap, but at the same time crystallize the reality of Asia in the era of globalized capitalism. In this context, it is important to explore the way Asia is being constructed within the everyday lives of people as well as from the top; to focus on a different Asia that sits outside modern constructions of ethnicity and nation state, and to locate Asia in the context of its relationship with Africa and Latin America in this historic moment of the 60th anniversary of the Bandung Conference. Therefore, this is the time we may need to question whether or not “Asians in Asia are still alive and well.” 相似文献
10.
Academic music: music instruction to engage third-grade students in learning basic fraction concepts
Susan Joan Courey Endre Balogh Jody Rebecca Siker Jae Paik 《Educational Studies in Mathematics》2012,81(2):251-278
This study examined the effects of an academic music intervention on conceptual understanding of music notation, fraction symbols, fraction size, and equivalency of third graders from a multicultural, mixed socio-economic public school setting. Students (N?=?67) were assigned by class to their general education mathematics program or to receive academic music instruction two times/week, 45?min/session, for 6?weeks. Academic music students used their conceptual understanding of music and fraction concepts to inform their solutions to fraction computation problems. Linear regression and t tests revealed statistically significant differences between experimental and comparison students?? music and fraction concepts, and fraction computation at posttest with large effect sizes. Students who came to instruction with less fraction knowledge responded well to instruction and produced posttest scores similar to their higher achieving peers. 相似文献