A combined time and frequency domain method for model reduction of discrete systems     

Chyi Hwang  Yen-Ping Shih  Ruey-Yinn Hwang 《Journal of The Franklin Institute》1981,311(6):391-402

A new combined time and frequency domain method for the model reduction of discrete systems in z-transfer function is presented. First, the z-transfer functions are transformed into the w-domain by the bilinear transformation, z = (1+w)/(1?w). Then, four model reduction methods—Routh approximation, Hurwitz polynomial approxima- tion, stability equation, and retaining dominant poles—are used respectively to reduce the order of the denominator polynomials in the w-domain. Least squares estimate is then used to find the optimal coefficients in the numerator polynomials of the reduced models so that the unit step response errors are reduced to a minimum. The advantages of the proposed method are that both frequency domain and time domain characteristics of the original systems can be preserved in the reduced models, and the reduced models are always stable provided the original models are stable.  相似文献   

Film scenes in interdisciplinary education: teaching the Internet of Things*     

Young-mee Hwang  Kwang-sun Kim  Tami Im 《Educational Media International》2017,54(2):83-98

The Internet of Things (IoT) is gaining importance in education owing to its rapid development. This study addresses the importance of interdisciplinary education between technology and the humanities. The use of films as a teaching resource is suitable for interdisciplinary education because films represent creative forecasts and predictions on future human society, helping the public realize what could occur in the future. By utilizing films in instruction, students can be trained to understand the three key functions of IoT and acquire the ability to develop creative applications of IoT. An IoT teaching model using the films Minority Report (2002), Big Hero 6 (2014), Iron Man 3 (2013), Her (2013), and Transcendence (2014), all of which depict various applications of IoT that could be helpful in the teaching of the functions and concepts of IoT, is suggested; an interdisciplinary class is carried out for 15 weeks following the model. The effectiveness of the class is measured using quantitative analysis, qualitative analysis, and reflection journals. The findings show that students developed interdisciplinary capacity through education using films.  相似文献   

Investigation of Learning Behaviors and Achievement of Vocational High School Students Using an Ubiquitous Physics Tablet PC App     

Siska Wati Dewi Purba  Wu-Yuin Hwang 《Journal of Science Education and Technology》2017,26(3):322-331

In this study, we designed and developed an app called Ubiquitous-Physics (U-Physics) for mobile devices like tablet PC or smart phones to help students learn the principles behind a simple pendulum in Physics. The unique characteristic of U-Physics is the use of sensors on mobile devices to collect acceleration and velocity data during pendulum swings. The data collected are transformed to facilitate students’ understanding of the pendulum time period. U-Physics helped students understand the effects of pendulum mass, length, and angle in relation to its time period. In addition, U-Physics was equipped with an annotation function such as textual annotation to help students interpret and understand the concepts and phenomena of the simple pendulum. U-Physics also generated graphs automatically to demonstrate the time period during which the pendulum was swinging. Results showed a significant positive correlation between interpreting graphs and applying formula. This finding indicated that the ability to interpret graphs has an important role in scientific learning. Therefore, we strongly recommend that physics teachers use graphs to enrich students’ information content and understanding and negative correlation between pair coherence and interpreting graphs. It may be that most of the participants (vocational high school students) have limited skill or confidence in physics problem solving; so, they often seek help from teachers or their high-achieving peers. In addition, the findings also indicated that U-Physics can enhance students’ achievement during a 3-week time period. We hope that this app can be globally used to learn physics in the future.  相似文献   

Influence of an integrated learning diagnosis and formative assessment-based personalized web learning approach on students learning performances and perceptions     

Charoenchai Wongwatkit  Niwat Srisawasdi  Gwo-Jen Hwang 《Interactive Learning Environments》2017,25(7):889-903

The advancement of computer and communication technologies has enabled students to learn across various real-world contexts with supports from the learning system. In the meantime, researchers have emphasized the necessity of providing personalized learning guidance or support by considering individual students’ status and needs in order to improve their learning performance. Based on this perspective, this study proposes a formative assessment-based approach for improving the learning performance of students in a personalized learning environment. An integrated learning diagnosis and formative assessment-based personalized web learning system was developed based on this approach. To evaluate the effectiveness of the proposed approach, an experiment was conducted in an elementary school mathematics course in Thailand. The experimental results showed that (1) the students learning with the proposed system revealed significantly better learning achievement and learning perceptions than those learning with the conventional learning system and (2) students’ learning perceptions of the system had significant relationships with their learning achievement.  相似文献   

Learning science in an era of globalization: a phenomenology of the foreign/strange     

SungWon Hwang  Wolff-Michael Roth 《Cultural Studies of Science Education》2008,3(4):937-958

In this study, we propose a set of concepts for conceptualizing issues of learning science related to globalization, the encounter with the (radically) foreign/strange—as this occurs as part of migration and even as part of the encounter of a learner with the unknown content that science lessons are to impart—from the perspective of the experiencing person and the experience. We take an approach to the question of the foreign/strange that is grounded in philosophies of difference, which have emerged in continental Europe, and which make use of advances in phenomenology, dialectics, and materialism. We draw on ethnographic work in one undergraduate physics course at a Canadian university, where we followed in particular one female Japanese student, who had come to this country for the purpose of getting a degree. As an entry point and as source of empirical materials, we draw on our own auto/ethnographic experience that brings particular advantages to ally pathos to the experience of the foreign/strange, something is happening to (affecting) us that is beyond all experience, understanding, and anticipation. We articulate three phenomenological aspects that pathos (empathy) allows us to understand concerning the experience of the foreign/strange and then provide an exemplary and exemplifying analysis.

SungWon HwangEmail:

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SungWon Hwang   is postdoctoral fellow at the University of Victoria, Canada, in which she has conducted interdisciplinary research projects that focus on cultural-historical perspectives of learning and identity and the role of the body in the context of science and mathematics. She taught middle school students in Korea and obtained her Ph.D in Seoul National University. Through her postdoctoral studies, she has developed her research interests in cultural studies and video-based qualitative research. Wolff-Michael Roth   is the Lansdowne Professor of Applied Cognitive Science at the University of Victoria, Canada. His research focuses on cultural-historical, linguistic, and embodied aspects of scientific and mathematical cognition and communication from elementary school to professional practice, including, among others, studies of scientists, technicians, and environmentalists at their work sites. The work is published in leading journals of linguistics, social studies of science, sociology, and fields and subfields of education (curriculum, mathematics education, science education). His recent books include Toward an Anthropology of Science (Kluwer, 2003), Rethinking Scientific Literacy (Routledge, 2004, with A. C. Barton), Talking Science (Rowman & Littlefield, 2005), and Doing Qualitative Research: Praxis of Method (SensePublishers, 2005).  相似文献   

Promoting children's inquiry performances in alternate reality games: A mobile concept mapping-based questioning approach     

Hsin-Yi Liang  Tien-Yu Hsu  Gwo-Jen Hwang 《British journal of educational technology : journal of the Council for Educational Technology》2021,52(5):2000-2019

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Facilitating cognitive processes during EFL smartwatch-supported learning activities in authentic contexts     

Rustam Shadiev  Wu-Yuin Hwang  Tzu-Yu Liu 《British journal of educational technology : journal of the Council for Educational Technology》2021,52(3):1230-1243

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Education and theory returning to life itself     

Keumjoong Hwang 《Educational Philosophy and Theory》2018,50(14):1328-1329

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Effects of a concept mapping-based flipped learning approach on EFL students’ English speaking performance,critical thinking awareness and speaking anxiety     

Mei-Rong Alice Chen  Gwo-Jen Hwang 《British journal of educational technology : journal of the Council for Educational Technology》2020,51(3):817-834

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A study of race and gender bias in the punishment of handicapped school children     

Anna C. McFadden  George E. Marsh II  Barrie Jo Price  Yunhan Hwang 《The Urban Review》1992,24(4):239-251

There is scant research concerned about punishment of handicapped, minority students in public schools. The purpose of this study was to investigate race and gender, types of rules violations, types of punishments, referral rates, referral frequencies, and follow-up activities to determine differences in treatment by race, sex, and handicapping condition. The sample consisted of 4,391 discipline files representing records from 9 schools in a district (K-12). All data were analyzed using the Chi Square statistic. It was demonstrated that racial bias existed in the administration of punishment, and that Black, male handicapped students were punished more severely than others for commission of the same offenses.  相似文献