Simultaneous measurement of concentrations and velocities of submicron species using multicolor imaging and microparticle image velocimetry     

Jing-Tang Yang  Yu-Hsuan Lai  Wei-Feng Fang    Miao-Hsing Hsu 《Biomicrofluidics》2010,4(1)

We propose a novel approach to resolve simultaneously the distributions of velocities and concentration of multiple, submicron species in microfluidic devices using microparticle image velocimetry, and particle counting. Both two-dimensional measurement and three-dimensional analysis of flow fields, from the stacked images, are achieved on applying a confocal fluorescence microscope. The displacements of all seeding particles are monitored to determine the overall velocity field, whereas the multicolor particles are counted and analyzed individually for each color to reveal the distributions of concentration and velocity of each species. A particle-counting algorithm is developed to determine quantitatively the spatially resolved concentration. This simultaneous measurement is performed on a typical T-shaped channel to investigate the mixing of fluids. The results are verified with numerical simulation; satisfactory agreement is achieved. This measurement technique possesses reliability appropriate for a powerful tool to analyze multispecies mixing flows, two-phase flows, and biofluids in microfluidic devices.  相似文献   

Retrieval of images by spatial and object similarities     

Shu-Ming Hsieh  Chiun-Chieh Hsu 《Information processing & management》2008

In the last several decades it has become an important basis to retrieve images from image databases (IDBs) by the semantic information held in the image objects and the spatial patterns formed by these objects. In this paper, we propose a new method for similarity retrieval of symbolic images by both the attributes and the spatial relationships of the contained objects. The proposed method CPM (common pattern method) retains the common spatial patterns of two images in new data structures CP_DAG (common pattern directed acyclic graph) and performs the similarity calculation efficiently in practice. The conducted experiments use both a synthetic dataset and an existing image database. The experimental results show that CPM outperforms LCS_Clique, SIM_R, SIM_DTC, and 2D Be-string for average efficiency and effectiveness. CPM also has steady efficiency while the number of image objects and the object symbol duplication rates increase.  相似文献   

Automated estimation of item difficulty for multiple-choice tests: An application of word embedding techniques     

Fu-Yuan Hsu  Hahn-Ming Lee  Tao-Hsing Chang  Yao-Ting Sung 《Information processing & management》2018,54(6):969-984

Pretesting is the most commonly used method for estimating test item difficulty because it provides highly accurate results that can be applied to assessment development activities. However, pretesting is inefficient, and it can lead to item exposure. Hence, an increasing number of studies have invested considerable effort in researching the automated estimation of item difficulty. Language proficiency tests constitute the majority of researched test topics, while comparatively less research has focused on content subjects. This paper introduces a novel method for the automated estimation of item difficulty for social studies tests. In this study, we explore the difficulty of multiple-choice items, which consist of the following item elements: a question and alternative options. We use learning materials to construct a semantic space using word embedding techniques and project an item's texts into the semantic space to obtain corresponding vectors. Semantic features are obtained by calculating the cosine similarity between the vectors of item elements. Subsequently, these semantic features are sent to a classifier for training and testing. Based on the output of the classifier, an estimation model is created and item difficulty is estimated. Our findings suggest that the semantic similarity between a stem and the options has the strongest impact on item difficulty. Furthermore, the results indicate that the proposed estimation method outperforms pretesting, and therefore, we expect that the proposed approach will complement and partially replace pretesting in future.  相似文献   

Extending the technology acceptance model of college learners' mobile-assisted language learning by incorporating psychological constructs     

Hui-Tzu Hsu  Chih-Cheng Lin 《British journal of educational technology : journal of the Council for Educational Technology》2022,53(2):286-306

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台湾四位得奖SUPER教师之教学研究     

管贵贞  徐章华 《教育学术月刊》2013,(1):50-56

成为一位好老师是老师们的目标也是压力.台湾少子化现象日益明显,每个孩子都是宝,如何将宝贝教导成才是挑战老师智慧的工作.“全国”教师会办理的“SUPER教师奖”选拔,发掘出“全国”教师的学习楷模.研究者以其中四位SUPER教师的访谈为起点,观摩他们的上课情形,归纳分析其特质,整理其教学特色.研究发现,四位SUPER教师具有如下特质:态度超热血,拥有无比的热情和毅力,凡事优先考虑学生;教学超用心,活泼有趣的教学策略让人跃跃欲试;关心超全面,掌握学生身心各方面发展,才能对症下药.  相似文献   

On Fraas and Newman's goodness‐of‐fit test for structural equation models     

Louis M. Hsu 《Structural equation modeling》2013,20(2):152-154

Fraas and Newman's (1994) binomial test of goodness of fit of structural equation models is based on the assumption that counts of path estimates consistent with a researcher's expectations can be viewed as, binomial random variables. In this article I argue that these counts do not have binomial distributions because of the lack of independence among estimates of path coefficients of structural equation models.  相似文献   

Social Justice and Juvenile Offenders: Examples of Fairness,Respect, and Access in Education Settings     

Janay B. Sander  Jill D. Sharkey  Amber N. Groomes  Lauren Krumholz  Kimberly Walker  Julie Y. Hsu 《Journal of educational and psychological consultation》2013,23(4):309-337

Youths involved in juvenile justice face unique barriers to educational and mental health services. This qualitative study illustrates social justice violations that are particularly salient for this population. Youths on probation, their mothers, and juvenile probation staff participated in interviews as part of a multisite study conducted in Texas and California. Interviews were coded using the Consensual Qualitative Research method. This study provides detailed examples of social justice components of fairness, respect, and access within school and juvenile justice settings. Implications for how schools could address these types of situations to promote fairness and decrease discrimination and stigma for youths with a criminal record who are trying to succeed in school are also discussed.  相似文献   

The importance and use of targeted content knowledge with scaffolding aid in educational simulation games     

Fu-Hsing Tsai  Charles Kinzer  Kuo-Hsun Hung  Cheng-Ling Alice Chen  I-Ying Hsu 《Interactive Learning Environments》2013,21(2):116-128

While most current educational simulation games provide learners with gameplay experience to motivate learning, there is often a lack of focus on ensuring that the desired content knowledge is actually learned. Students may focus on completing game activities without learning the targeted content knowledge, thus negating the desired learning outcomes. We argue that to help students achieve improved learning performance, providing targeted content knowledge should be a specific focus in designing educational games; in addition, scaffolding strategies to promote the use of in-game contents should also be provided. Thus, the present study explores the effects and usage of providing three types of scaffolding aids in two versions of educational simulations with in-game contents. The results suggest that providing targeted content with scaffolding aid in educational simulation games helps students to achieve better learning performance.  相似文献   

Supporting scientific modeling practices in atmospheric sciences: intended and actual affordances of a computer-based modeling tool     

Pai-Hsing Wu  Che-Yu Kuo  Ying-Shao Hsu 《Interactive Learning Environments》2013,21(6):748-765

Computer-based learning tools include design features to enhance learning but learners may not always perceive the existence of these features and use them in desirable ways. There might be a gap between what the tool features are designed to offer (intended affordance) and what they are actually used (actual affordance). This study thus aims at investigating how the design features of a computer-based tool supported high school students' modeling practices in atmospheric sciences. Twenty-three 10th graders participated in 16 hours of learning activities by using the tool. We conducted a detailed analysis of students' computer activities, their use of the design features, and their building, testing, analyzing, and evaluating practices. The analysis showed that while some design features such as Variable List and Testing Variables were perceived by students and successfully afforded their enactment of building and analyzing practices, other features including Screen Shot and Edit were rarely used or not utilized in the desirable ways. Based on the findings, this study suggests that the realization of intended affordances may involve factors of learners' characteristics, the nature of learning activities, and the complexity of tasks, and constructs an affordance analysis scheme to inform the design of computer-based learning tools.  相似文献   

Middle School Science Teachers’ Confidence and Pedagogical Practice of New Literacies     

Hui-Yin Hsu  Shiang-Kwei Wang  Lisa Runco 《Journal of Science Education and Technology》2013,22(3):314-324

Due to the rapid advancements of information and communication technologies (ICTs), educational researchers argue that multimodal and new literacies should become common practices in schools. As new ICTs emerge and evolve, students need the new literacies skills and practices to successfully participate fully in the civic life of a global community. Are teachers prepared to integrate ICTs in the classroom to develop students’ new literacies skills? The purpose of this study is to suggest a new literacies framework that guides ICTs integration and supports scientific inquiry, as well as investigate middle school teachers’ confidence to practice new literacies in science classrooms. The study adopted mixed-methodology design, surveyed 32 middle school science teachers’ ICTs and new literacies skills, and randomly observed 15 teachers’ new literacies practices in the classrooms. The results revealed that even though teachers have high confidence in using ICTs, the meaningful technology integration and new literacies practices were scarcely observed in their classroom practices.  相似文献