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Han Zhaoxuan

Bio: Han Zhaoxuan is an academic researcher from Northwestern Polytechnical University. The author has contributed to research in topics: Hypercube & Histogram. The author has an hindex of 1, co-authored 2 publications receiving 2 citations.

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Journal ArticleDOI
TL;DR: The simulation results show that the proposed image enhancement algorithm can effectively suppress the noise of an image, enhance its contrast and visual effect, sharpen its edge and adjust its dynamic range.

2 citations

Journal ArticleDOI
TL;DR: It is concluded that although it is believed that a hypercube is generally superior to hyper-rings in performance, this is not always the case, particularly for locally constrained applications, where communications occur mostly among neighboring nodes.
Abstract: The well-known torus and its variants, which we call hyper-rings, as well as hypercube architectures are further studied and evaluated as interconnection networks for multicomputers. Comparisons are made among hyper-rings and between hyper-ring and hypercube networks under different communication patterns. It is concluded that although it is believed that a hypercube is generally superior to hyper-rings in performance, this is not always the case, particularly for locally constrained applications, where communications occur mostly among neighboring nodes.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: A PI curriculum for two upper-division computer science courses that achieved student learning gains equivalent to those reported in successful lower-division computing courses and found that student feedback for each class was overwhelmingly positive, with 88% of students recommending PI for use in other computer science classes.
Abstract: Peer Instruction (PI) is an active learning pedagogical technique. PI lectures present students with a series of multiple-choice questions, which they respond to both individually and in groups. PI has been widely successful in the physical sciences and, recently, has been successfully adopted by computer science instructors in lower-division, introductory courses. In this work, we challenge readers to consider PI for their upper-division courses as well. We present a PI curriculum for two upper-division computer science courses: Computer Architecture and Theory of Computation. These courses exemplify several perceived challenges to the adoption of PI in upper-division courses, including: exploration of abstract ideas, development of high-level judgment of engineering design trade-offs, and exercising advanced mathematical sophistication. This work includes selected course materials illustrating how these challenges are overcome, learning gains results comparing these upper-division courses with previous lower-division results in the literature, student attitudinal survey results (N = 501), and pragmatic advice to prospective developers and adopters. We present three main findings. First, we find that these upper-division courses achieved student learning gains equivalent to those reported in successful lower-division computing courses. Second, we find that student feedback for each class was overwhelmingly positive, with 88p of students recommending PI for use in other computer science classes. Third, we find that instructors adopting the materials introduced here were able to replicate the outcomes of the instructors who developed the materials in terms of student learning gains and student feedback.

85 citations

Journal ArticleDOI
01 Oct 2022
TL;DR: In this paper , a faulty feeder detection method based on the characteristics of transient zero-mode current (TZMC) in multi-frequency bands is proposed, which is tested through simulations on the PSCAD/EMTDC platform.
Abstract: In a small-current grounding system, the pole-to-ground fault may cause the voltage drop in the fault pole and the voltage rise in the other poles. In flexible DC distribution systems, Severe voltage variation may shorten the insulation lifetime of the equipment, which leads to great concerns on the safety issue. In addition, the existence of high transition resistance degrades the accuracy of fault detection methods, thus further affecting the reliability of the system. Therefore, it is essential to explore an advanced technology for faulty feeder detection. This study proposes a faulty feeder detection method based on the characteristics of transient zero-mode current (TZMC) in multi-frequency bands. The change rate of zero-mode voltage is applied as the protection activation criterion. Then, the characteristic matrix is constructed via computing the fuzzy entropy of TZMC in each frequency band. Finally, the faulty feeder can be identified by conducting fuzzy C-means on the characteristic matrix. This proposed method is tested through simulations on the PSCAD/EMTDC platform, which successfully demonstrates its outstanding adaptability, reliability, and accuracy.

4 citations

Journal ArticleDOI
TL;DR: Experimental results show that the fuzzy degree of the image is reduced by the improved algorithm, and the clarity of the adaptive smoothness constraint image is improved effectively.
Abstract: For the problems of poor enhancement effect and long time consuming of the traditional algorithm, an adaptive smoothness constraint image multilevel fuzzy enhancement algorithm based on secondary color-to-grayscale conversion is proposed. By using fuzzy set theory and generalized fuzzy set theory, a new linear generalized fuzzy operator transformation is carried out to obtain a new linear generalized fuzzy operator. By using linear generalized membership transformation and inverse transformation, secondary color-to-grayscale conversion of adaptive smoothness constraint image is performed. Combined with generalized fuzzy operator, the region contrast fuzzy enhancement of adaptive smoothness constraint image is realized, and image multilevel fuzzy enhancement is realized. Experimental results show that the fuzzy degree of the image is reduced by the improved algorithm, and the clarity of the adaptive smoothness constraint image is improved effectively. The time consuming is short, and it has some advantages.

2 citations