Social media communication strategies of government agencies: Twitter use in Korea and the USA     

Gohar Feroz Khan  Ho Young Yoon 《亚洲交流杂志》2014,24(1):60-78

This study examines Twitter use by the central government in Korea and the federal government in the USA by employing the webometric technique to extract their Twitter activity (basic Twitter statistics such as the numbers of followers, followings, and Tweets) and the social network analysis technique to map the relationship between their Twitter accounts and the direction of outlinks in their Tweets. The results of the initial analysis indicate some differences in Twitter strategies between the two governments. For example, Korean ministries were well connected through a dense network, engaged in collective cooperation, and retweeted common content to reinforce their collective agendas regardless of their main administrative functions, whereas US government departments were less collective and more individualistic and retweeted those messages that specifically fit the purpose of each department. In addition, the results for outlinks indicate that US government departments preferred private sources of information, whereas Korean ministries, government sources.  相似文献   

The performance of adverse effects search filters in MEDLINE and EMBASE   总被引：1，自引：1，他引：0  

Golder S  Loke YK 《Health information and libraries journal》2012,29(2):141-151

Background: Search filters can potentially improve the efficiency of searches involving electronic databases such as medline and embase . Although search filters have been developed for identifying records that contain adverse effects data, little is known about the sensitivity of such filters. Objectives: This study measured the sensitivity of using available adverse effects filters to retrieve papers with adverse effects data. Methods: A total of 233 included studies from 26 systematic reviews of adverse effects were used for analysis. Search filters from medline and embase were tested for their sensitivity in retrieving the records included in these reviews. In addition, the sensitivity of each individual search term used in at least one search filter was measured. Results: Subheadings proved the most useful search terms in both medline and embase . No indexing terms in medline achieved over 12% sensitivity. The sensitivity of published search filters varied in medline from 3% to 93% and in embase from 57% to 97%. Whether this level of sensitivity is acceptable will be dependent on the purpose of the search. Conclusions: Although no adverse effects search filter captured all the relevant records, high sensitivity could be achieved. Search filters may therefore be useful in retrieving adverse effects data.  相似文献   

A new perspective on in vitro assessment method for evaluating quantum dot toxicity by using microfluidics technology     

Sanjeev Kumar Mahto  Tae Hyun Yoon    Seog Woo Rhee 《Biomicrofluidics》2010,4(3)

In this study, we demonstrate a new perspective on in vitro assessment method for evaluating quantum dot (QD) toxicity by using microfluidics technology. A new biomimetic approach, based on the flow exposure condition, was applied in order to characterize the cytotoxic potential of QD. In addition, the outcomes obtained from the flow exposure condition were compared to those of the static exposure condition. An in vitro cell array system was established that used an integrated multicompartmented microfluidic device to develop a sensitive flow exposure condition. QDs modified with cetyltrimethyl ammonium bromide∕trioctylphosphine oxide were used for the cytotoxicity assessment. The results suggested noticeable differences in the number of detached and deformed cells and the viability percentages between two different exposure conditions. The intracellular production of reactive oxygen species and release of cadmium were found to be the possible causes of QD-induced cytotoxicity, irrespective of the types of exposure condition. In contrast to the static exposure, the flow exposure apparently avoided the gravitational settling of particles and probably assisted in the homogeneous distribution of nanoparticles in the culture medium during exposure time. Moreover, the flow exposure condition resembled in vivo physiological conditions very closely, and thus, the flow exposure condition can offer potential advantages for nanotoxicity research.  相似文献   

“Gangnam Style” in Dhaka and inter-Asian refraction     

Soo Ryon Yoon 《Inter-Asia Cultural Studies》2018,19(2):162-179

This essay explores the political implications of the flash mob dance in Dhaka, Bangladesh performed in response to the 2012 global viral sensation of South Korean rapper PSY’s “Gangnam Style” music video. The global fame of “Gangnam Style” has much to do with its success online and in the U.S. popular music industry. It, however, also solicited suspicion from popular culture critics that the images of comical PSY worked successfully thanks to unchecked consumption of the racial stereotypes of Asian men. While recognizing these problems as more than valid, this essay simultaneously calls for a more transnational and inter-Asian understanding of the material to argue for a productive quality of PSY’s performance. Using “refraction” as a mode of thinking about inter-Asian circulation of pop culture, this essay considers the flash mob performed in Dhaka, Bangladesh as an important yet underexplored case study that shows different performative practices associated with “Gangnam Style” deeply rooted in historicity of colonialism and nationalism. The case study shows that the circulation of “Gangnam Style” materialized through a performance in Dhaka enlarged contemporary discourse among young urban Bangladeshi spectators around Bangladeshiness and its cultural identity. This complicated an easy assumption about “Gangnam Style” and its success in the U.S. mainstream pop culture, while simultaneously displacing the Bangladeshi cultural subjects from the immobile position of “the Other.”  相似文献   

Learning analytics application to examine validity and generalizability of game-based assessment for spatial reasoning     

Yoon Jeon Kim  Mariah A. Knowles  Jennifer Scianna  Grace Lin  José A. Ruipérez-Valiente 《British journal of educational technology : journal of the Council for Educational Technology》2023,54(1):355-372

Game-based assessment (GBA), a specific application of games for learning, has been recognized as an alternative form of assessment. While there is a substantive body of literature that supports the educational benefits of GBA, limited work investigates the validity and generalizability of such systems. In this paper, we describe applications of learning analytics methods to provide evidence for psychometric qualities of a digital GBA called Shadowspect, particularly to what extent Shadowspect is a robust assessment tool for middle school students' spatial reasoning skills. Our findings indicate that Shadowspect is a valid assessment for spatial reasoning skills, and it has comparable precision for both male and female students. In addition, students' enjoyment of the game is positively related to their overall competency as measured by the game regardless of the level of their existing spatial reasoning skills.

Practitioner notes

What is already known about this topic:

• Digital games can be a powerful context to support and assess student learning.
• Games as assessments need to meet certain psychometric qualities such as validity and generalizability.
• Learning analytics provide useful ways to establish assessment models for educational games, as well as to investigate their psychometric qualities.

What this paper adds:

• How a digital game can be coupled with learning analytics practices to assess spatial reasoning skills.
• How to evaluate psychometric qualities of game-based assessment using learning analytics techniques.
• Investigation of validity and generalizability of game-based assessment for spatial reasoning skills and the interplay of the game-based assessment with enjoyment.

Implications for practice and/or policy:

• Game-based assessments that incorporate learning analytics can be used as an alternative to pencil-and-paper tests to measure cognitive skills such as spatial reasoning.
• More training and assessment of spatial reasoning embedded in games can motivate students who might not be on the STEM tracks, thus broadening participation in STEM.
• Game-based learning and assessment researchers should consider possible factors that affect how certain populations of students enjoy educational games, so it does not further marginalize specific student populations.

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