University Of Electronic Science And Technology Of China Research Articles

Interdisciplinary Project-Based Learning: Experiences and Reflections From Teaching Electronic Engineering in China

Continuous developments in the electronics industry have led to constantly changing career roles and graduate skills requirements. Students in the University of Electronic Science and Technology of China (UESTC) have complained that numerous courses in electronic engineering are heavily focused on theoretical knowledge that is disconnected from the needs of the industry. Thus, in an effort toward delivering student-centered educational programmes that meet the needs of the industry, this article introduces an innovative course that was developed using the project-based learning (PBL) method and situated in the electronic engineering undergraduate programme at UESTC. Since real-world engineering projects require teams to collaborate on ill-defined problems, we focused this innovative course on developing professional and technical skills, drawing from a range of more typical electronic engineering courses. We provide full details of two projects that were created for this PBL approach and evaluate them as practice examples that demonstrate the impact of this practical pedagogic innovation in UESTC. According to our evaluation, completed by all 40 of our enrolled students, our innovative course based on interdisciplinary PBL exercises demonstrated a significant improvement in student satisfaction and 65% of students preferred the interdisciplinary PBL course in comparison to traditional lecture-based courses.

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Meet the Editors

MOTION PLANNING OF ASSISTIVE EXOSKELETON IN HUMAN’S LOCOMOTION REHABILITATION

Researches on rehabilitation exoskeleton system have bee
 n implementing in recent decades and have been achieving many advantages. However, most of reseaches have focused on more simplified systems such as rehabilitation exoskeleton for one or two joints or for one paralysed leg with the purpose of recovering human’s locomotion pattern. Researches on rehabilitation exoskeleton using for whole two paralysed legs are limited because of the complexity of balance issue for a combined human – exoskeleton system. Therefore, crutches are used to prevent the human from falling during human’s walking in recent researches. In order to abandon the crutches and help to recover human’s nomal walking pattern, the balance problem of combined human-exoskeleton system must be considered in control algorithm. In this paper, we build a motion path for a combined human-exoskeleton ensuring that the combined human-exoskeleton system can move in a balanced area. Our proposed paths are validated in the control algorithm for the HUALEX exoskeleton system in University of Electronic Science and Technology of China (UESTC).

Ultra-High Velocity Ratio in Magnetron Injection Guns for Low-Voltage Compact Gyrotrons

Low-voltage compact gyrotron is under development at the University of Electronic Science and Technology of China (UESTC) for industrial applications. Due to the low operating voltage, the relativistic factor is weak, and interaction efficiency could not be high. Therefore, a magnetron-injection gun (MIG) with an extremely high-velocity ratio α (around 2.5) is selected to improve the interaction efficiency. As beam voltage drops, space charge effects become more and more obvious, thus a more detailed analysis of velocity-ratio α is significant to perform low-voltage gyrotrons, including beam voltage, beam current, modulating voltage, depression voltage, cathode magnetic field, and magnetic depression ratio. Theoretical analysis and simulation optimization are adopted to demonstrate the feasibility of an ultra-high velocity ratio, which considers the space charge effects. Based on theoretical analysis, an electron gun with a transverse to longitudinal velocity ratio 2.55 and velocity spread 9.3% is designed through simulation optimization. The working voltage and current are 10 kV and 0.46 A with cathode emission density 1 A/cm2 for a 75 GHz hundreds of watts’ output power gyrotron.

Teaching Embedded Systems for Energy Harvesting Applications: A Comparison of Teaching Methods Adopted in UESTC and KTH

Further to China’s plan that was introduced in 2017 for attracting more students into engineering, many Chinese universities have started to explore new teaching methods that can be adopted into their programs. This shift was geared towards developing student-centred teaching materials rather than traditional teacher centred instruction. In this manuscript, we compare two different methods of instruction for a course on energy harvesting using embedded systems. We describe the learning materials and showcase the impact that project-based learning has had on a cohort of Chinese students that were enrolled in a joint master’s program between the University of Electronic Science and Technology of China (UESTC) and the Royal Institute of Technology (KTH). KTH has made remarkable progress in the teaching of embedded systems technology for energy harvesting applications, with great emphasis on active as well as collaborative learning. We demonstrate two examples of projects that Chinese students have completed in KTH and present evaluative data regarding their experiences. Our results show that KTH’s approach in teaching this module has had a positive impact on student learning, with an average of 80% of students think that teaching in KTH is conducive to students’ independent exploration.

Practice of Library Resource Construction to Support Higher Education in University of Electronic Science and Technology of China

University of Electronic Science and Technology of China (UESTC) and its library set the goal of cultivating students “New Four Abilities”, guiding them to form independent personality, and educating them to adjust to society. The UESTC library build resource system with curriculums and other teaching materials. We reviewed these resources and found excellent usage records under current measure criteria. We plan to develop more efficacious implementations and introduce accurate evaluation system in near future.

Bayesian-MCMC-based parameter estimation of stealth aircraft RCS models**Project supported by the National Natural Science Foundation of China (Grant No. 61101173), the National Basic Research Program of China (Grant No. 613206), the National High Technology Research and Development Program of China (Grant No. 2012AA01A308), the State Scholarship Fund by the China Scholarship Council (CSC), and the Oversea Academic Training Funds, and

When modeling a stealth aircraft with low RCS (Radar Cross Section), conventional parameter estimation methods may cause a deviation from the actual distribution, owing to the fact that the characteristic parameters are estimated via directly calculating the statistics of RCS. The Bayesian–Markov Chain Monte Carlo (Bayesian-MCMC) method is introduced herein to estimate the parameters so as to improve the fitting accuracies of fluctuation models. The parameter estimations of the lognormal and the Legendre polynomial models are reformulated in the Bayesian framework. The MCMC algorithm is then adopted to calculate the parameter estimates. Numerical results show that the distribution curves obtained by the proposed method exhibit improved consistence with the actual ones, compared with those fitted by the conventional method. The fitting accuracy could be improved by no less than 25% for both fluctuation models, which implies that the Bayesian-MCMC method might be a good candidate among the optimal parameter estimation methods for stealth aircraft RCS models.

Free-electron maser based on the Smith–Purcell effect

This paper reports the experimental results of the Smith–Purcell free-electron maser (orotron) developed at University of Electronic Science and Technology of China (UESTC). The output powers from this FEM are 200 and 1200 mw, respectively, at 3 and 4 mm wavelengths.