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91.
If it's fifth period, it must be time for Hacky Sack for high school senior Jess Rojas. Second period the Boulder, Colo., student spends staring into space at the library, and the rest of his day isn't much more challenging: The 17-year-old claims he can get A' or B's with little or no ef- 相似文献
92.
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, SIMR, SIMDTC, 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
93.
Several researchers have investigated the effects of computer simulations on students’ learning. However, few have focused
on how simulations with authentic contexts influences students’ inquiry skills. Therefore, for the purposes of this study,
we developed a computer simulation (FossilSim) embedded in an authentic inquiry lesson. FossilSim integrated data from real
field investigations with geological laws for identifying the sequence of geological events. Data were collected from two
experiments to examine ninth graders’ abilities for reconstructing a sequence of geological events with the aid of FossilSim.
The sample groups in Experiments 1 and 2 were 58 and 11 ninth graders, respectively. The results indicated that the authentic
inquiry lesson promoted the development of students’ inquiry skills. In addition, FossilSim played a key role in engaging
students to apply geological laws, make multi-scale observations, and clarify their ideas about geological time. 相似文献
94.
Previous research on professional certification has primarily focused on graduate certificates in intensive care nursing, writing certificates for practitioners, maintenance of certification in radiation oncology, and the certification of teachers and surgeons. Research on certification in the domain of business and management from an attitudinal?Cbehavioral approach has been lacking. Social psychological theories provide potentially useful tools for explaining how attitudes, intentions, and behaviors are changed. The current study compared four intention-based models??the theory of planned behavior, the theory of self-regulation (TSR), the revised TSR (in which desire is a partial mediator), and the other revised TSR (in which desire is a full mediator)??in terms of their ability to predict the intentions of business and management students to obtain certification in their fields. Participants were drawn from the southern, middle, and northern areas of Taiwan. A structural equation model applied to a sample of 273 undergraduates demonstrated that attitudes, subjective norms, perceived behavioral controls, desires, intentions, and behaviors were associated with certification in business and management domains. The explanatory power of the revised TSR in which desire was a full mediator was superior to that of the competing models. Implications and future directions are discussed. 相似文献
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98.
The Goal-based Scenario method is a design model for applying simulations to instruction. This portfolio item describes an
implementation of Goal-based Scenarios for the teaching of statistics. The application demonstrates how simulations can be
contextualized and how they can allow learners to engage in legitimate inquiry in the pursuit of their instructional goals. 相似文献
99.
Pei-Ling Hsu 《Cultural Studies of Science Education》2012,7(1):103-110
I respond to Baron and Chen’s article on creative cultural divergence, which they describe as the novel pedagogy of diverging
from culturally generated educational expectations. Their article provides an analysis on how an experienced Taiwanese teacher
drew on different forms of creative cultural divergence to facilitate students’ critical thinking and science inquiry. To
better understand the phenomenon of creative cultural divergence, I draw on Bakhtin’s concepts of outsideness, novelization, and internally persuasive discourse to analyze how these divergences are produced. These concepts not only help us to understand the phenomenon of creative cultural
divergence, they also help me to reflect on my own culture-crossing experience. The implications of these concepts for culture
and education are further discussed. 相似文献
100.
Renato Borba Teixeira Tiago Roux Oliveira Ramon Romankevicius Costa Liu Hsu 《Journal of The Franklin Institute》2021,358(3):1715-1742
The problem of adaptive control design for multivariable linear time-invariant plants with unknown control direction is considered. A solution is proposed based on the SDU factorization of the high frequency gain matrix (HFG) and the monitoring function approach. The adaptation scheme is the binary model reference adaptive control (BMRAC) which utilizes parameter projection and sufficiently high adaptation gains. The signs of the leading principal minors of the HFG define the control directions, and the lack of knowledge of which is a major challenge in the multivariable framework. The role of the monitoring function is to monitor the output error transient and then provide the necessary changes of the adaptation gain signs to guarantee a stable adaptive control. In addition to proving the signal boundedness of the resulting closed-loop system, the output tracking error is shown to be asymptotically as well as exponentially practically stable, i.e., exponentially stable with respect to a small residual compact set of size inversely proportional to the BMRAC adaptation gain. The latter implies good transient properties of the output tracking error in contrast to conventional adaptive laws which only guarantee asymptotic stability but can lead to extremely slow error convergence. The extension of the proposed approach to matched disturbances is also briefly discussed following the classical paradigm of disturbance estimators. Numerical results with a visual servoing application illustrate the efficiency of the proposed method. 相似文献