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111.
With its remarkable growth, the cable TV industry has witnessed increasing business integration continuously. This study categorizes technology-based operators into 3 groups on the basis of business integration—vertically integrated, horizontally integrated, and isolated system operators-and estimates the efficiency of each group. In addition, metafrontier analysis is employed to compare the efficiencies of the groups. The results suggest that vertically and horizontally integrated system operators can improve technical efficiency by accomplishing economies of scope and scale, respectively. 相似文献
112.
Jon-Chao Hong Ming-Yueh Hwang Yu-Ju Chen Mei-Yung Chen Li-Chun Liu 《Thinking Skills and Creativity》2012,7(3):187-197
Eight trigrams (BaGua) is a philosophy that has played an essential role in Chinese life. The purpose of the present study is to extend the theory to organizational problem-solving, so that individuals can engage in creative problem solving and justification to discover the most effective approaches. Questionnaires were returned by 259 research and development managers, and were analyzed using the SEM statistical method. The results indicate that the interaction among each trigram in the model of BaGua was significantly correlated. Most of the hypotheses were supported. The more an individual interacted with others, with data and with devices, the higher the problem sensitivity and evaluation performance. Despite the finding that the Tui trigram was not significantly related to the Ken trigram, all other trigram elements significantly affected each other. This finding is discussed in terms of the confirmatory situation and the conceptualization of epistemology in problem-solving. 相似文献
113.
J. B. Arbaugh Regina Bento Alvin Hwang 《Decision Sciences Journal of Innovative Education》2010,8(2):391-415
Using data provided by graduates from 128 MBA programs, we examined the extent to which age, gender, and ethnicity predicted student perceptions of the MBA experience. We found that women and minorities were more likely to see program costs and the availability of financial support as significant factors in their program enrollment decisions than were Caucasian males. The most consistent predictor of students’ perceptions of their educational experience was whether the MBA program was full time or part time, with full‐time programs generally perceived more favorably. Our findings suggest that because diversity measures of age, gender, and ethnicity were not consistent predictors across the different perception areas, at minimum, MBA programs presently do not consistently inhibit diversity. However, given the increasing percentage of women and minorities that comprise the undergraduate population, maintaining the present path in program accessibility may create enrollment problems for MBA programs perhaps in the very near future. Therefore, we conclude with a discussion of the changing demographics in higher education and their potential implications for MBA programs and suggestions for how MBA programs might respond. 相似文献
114.
We present the conformal coating of non-spherical magnetic particles in a co-laminar flow
microfluidic system. Whereas in the previous reports spherical particles had been coated with thin
films that formed spheres around the particles; in this article, we show the coating of
non-spherical particles with coating layers that are approximately uniform in thickness. The novelty
of our work is that while liquid-liquid interfacial tension tends to minimize the surface area of
interfaces—for example, to form spherical droplets that encapsulate spherical particles—in our
experiments, the thin film that coats non-spherical particles has a non-minimal interfacial area. We
first make bullet-shaped magnetic microparticles using a stop-flow lithography method that was
previously demonstrated. We then suspend the bullet-shaped microparticles in an aqueous solution and
flow the particle suspension with a co-flow of a non-aqueous mixture. A magnetic field gradient from
a permanent magnet pulls the microparticles in the transverse direction to the fluid flow, until the
particles reach the interface between the immiscible fluids. We observe that upon crossing the
oil-water interface, the microparticles become coated by a thin film of the aqueous fluid. When we
increase the two-fluid interfacial tension by reducing surfactant concentration, we observe that the
particles become trapped at the interface, and we use this observation to extract an approximate
magnetic susceptibility of the manufactured non-spherical microparticles. Finally, using
fluorescence imaging, we confirm the uniformity of the thin film coating along the entire curved
surface of the bullet-shaped particles. To the best of our knowledge, this is the first
demonstration of conformal coating of non-spherical particles using microfluidics. 相似文献
115.
Fostering High School Students’ Conceptual Understandings About Seasons: The Design of a Technology-enhanced Learning Environment 总被引:1,自引:0,他引:1
The purpose of this study is to understand in what ways a technology-enhanced learning (TEL) environment supports learning
about the causes of the seasons. The environment was designed to engage students in five cognitive phases: Contextualisation,
Sense making, Exploration, Modeling, and Application. Seventy-five high school students participated in this study and multiple
sources of data were collected to investigate students’ conceptual understandings and the interactions between the design
of the environment and students’ alternative conceptions. The findings show that the number of alternative conceptions held
by students were reduced except for the incorrect concepts of “the length of sunshine” and “the distance between the sun and
the earth.” The percentage of partial explanations held by students was also reduced from 60.5 to 55.3% and the percentage
of students holding complete scientific explanations after using Lesson Seasons rose from 2.6 to 15.8%. While some students
succeeded in modeling their science concepts closely to the expert’s concepts, some failed to do so after the invention. The
unsuccessful students could not remediate their alternative conceptions without explicit guidance and scaffolding. Future
research can then be focused on understanding how to provide proper scaffoldings for removing some alternative concepts which
are highly resistant to change.
相似文献
Fu-Kwun HwangEmail: |
116.
Factors influencing university teachers’ use of a mobile technology-enhanced teaching (MTT) platform
Tang Kai-Yu Hsiao Chun-Hua Tu Yun-Fang Hwang Gwo-Jen Wang Youmei 《Educational technology research and development : ETR & D》2021,69(5):2705-2728
Educational technology research and development - The main purpose of this study was to examine the critical factors influencing university teachers’ use of a mobile technology-enhanced... 相似文献
117.
Electroconvection is known to cause strong convective mixing in a microchannel near a nanoporous membrane or a nanochannel in contact with an electrolyte solution due to the external electric field. This study addresses micromixer behavior subject to electroconvection occurring near a nanoporous membrane in-situ fabricated by a laser polymerization technique on a microfluidic chip. We found that the micromixer behavior can be categorized into three regimes. Briefly, the weak electroconvection regime is characterized by weak mixing performance at a low applied voltage and KCl concentration, whereas the strong electroconvection regime has a high mixing performance when the applied voltage and KCl concentration are moderately high. Finally, the incomplete electroconvection regime has an incomplete electric double-layer overlap in the nanopores of the membrane when the electrolyte concentration is very high. The mixing index reached 0.92 in the strong electroconvection regime. The detailed fabrication methods for the micromixer and characterization results are discussed in this paper. 相似文献
118.
Hyun-Yong Noh Author VitaeJin-Hyung Lee Author Vitae Sae-Won Oh Author VitaeKeum-Sung Hwang Author Vitae Sung-Bae ChoAuthor Vitae 《Information processing & management》2012,48(1):1-12
Personal mobile devices such as cellular phones, smart phones and PMPs have advanced incredibly in the past decade. The mobile technologies make research on the life log and user-context awareness feasible. In other words, sensors in mobile devices can collect the variety of user’s information, and various works have been conducted using that information. Most of works used a user’s location information as the most useful clue to recognize the user context. However, the location information in the conventional works usually depends on a GPS receiver that has limited function, because it cannot localize a person in a building and thus lowers the performance of the user-context awareness. This paper develops a system to solve such problems and to infer a user’s hidden information more accurately using Bayesian network and indoor-location information. Also, this paper presents a new technique for localization in a building using a decision tree and signals for the Wireless LAN because the decision tree has many advantages which outweigh other localization techniques. 相似文献
119.
Ju‐Ling Shih Hui‐Chun Chu Gwo‐Jen Hwang Kinshuk 《British journal of educational technology : journal of the Council for Educational Technology》2011,42(3):373-394
In recent years, digital learning has been converting from e‐learning to m‐learning because of the significant growth of wireless and mobile computing technologies. Students can learn any time and any where with mobile devices. Consequently, context‐aware ubiquitous learning (u‐learning) is emerging as a new research area. It integrates wireless, mobile and context awareness technologies in order to detect the situation of the learners and provide more seamless adaptive support in the learning process. In this paper, a context‐aware u‐learning environment is developed for learning about campus vegetation in elementary schools based on an innovative approach by employing repertory grid method in designing learning content. In addition, we probe the feasibility of context‐aware u‐learning in courses by soliciting feedback from the students and teachers through interviews and questionnaires. The findings reveal that the environment is capable of enhancing students’ motivation and learning effectiveness. Moreover, it is also capable of reducing the teaching load while enabling better control of class order. 相似文献
120.
Gwo-Jen Hwang Chun-Ming Hung Nian-Shing Chen 《Educational technology research and development : ETR & D》2014,62(2):129-145
In this study, a peer assessment-based game development approach is proposed for improving students’ learning achievements, motivations and problem-solving skills. An experiment has been conducted to evaluate the effectiveness of the proposed approach in a science course at an elementary school. A total of 167 sixth graders participated in the experiment, 82 of whom were assigned to the experimental group and learned with the peer assessment-based game development approach, while 85 students were in the control group and learned with the conventional game development approach. From the empirical results, it was found that the proposed approach could effectively promote students’ learning achievement, learning motivation, problem-solving skills, as well as their perceptions of the use of educational computer games. Moreover, it was found from the open-ended questions that most of the students perceived peer assessment-based game development as an effective learning strategy that helped them improve their deep learning status in terms of “in-depth thinking,” “creativity,” and “motivation.” 相似文献