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- 저자 : Jianzhong Cui (검색결과 5 건)
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The Research of Relationship between SICSFCL and Distance Relay Protection of Power Grid
Wang, Jianzhong,Cui, Jibin,Xiong, Zhiquan,Zi, Meirong The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.2
A Saturated Iron Core Superconducting Fault Current Limiter (SICSFCL) provides a powerful fault current limitation in high voltage and high capacity power grid. A 35kV/90MVA SICSFCL was installed in a 35 kV network for live-grid operation, in January 2008 at Puji substation, Kunming, China. With deep research on SICSFCL, the matching problem between SICSFCL and relay protection currently needs to be solved. This paper analyzes the influence that SICSFCL brings to the distance relay protection which is used widely in high voltage power grid, and considering the characteristics of microcomputerbased protection, this paper proposes a new algorithm to eliminate the influence.
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Na Li,Can Cui,Yue Cheng,Yanhong Wu,Jianzhong Yin,Wen Shen 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.4
Objective: The study aimed to evaluate the contributions of levator ani muscle (LAM) injury, vesical neck movement, urethral length and mobility, and urethral sphincter dysfunction observed on magnetic resonance imaging (MRI) towards stress urinary incontinence (SUI) after vaginal delivery. Materials and Methods: Fifty primiparous women after 6 months of delivery (15 with SUI and 35 without) and 35 nulliparous as continent controls underwent MRI at rest and Valsalva maneuver. A published levator ani scoring system was used to characterize morphological changes of LAM. The severity of the injury was divided into three categories as none, minor, and major. A series of common parameters including levator plate angle, iliococcygeal angle, and levator hiatus were used to describe the functional conditions of LAM. Urethral mobility was defined based on the rotation of the urethra between Valsalva and rest status. Vesical neck movement was evaluated by its distance to the pubococcygeal line. Urethral sphincter dysfunction was defined as the widening of the proximal urethra and/or funneling at the urethrovesical junction during Valsalva. Results: Primiparous incontinent (PI) women had additional major levator ani defects (33.3% vs. 17.1%) while less minor defects (0.7% vs. 31.4%) than primiparous continent (PC) women. Vesical neck downward movement in PI women was more obvious than PC women (28.5 mm vs. 24.2 mm, p = 0.006). Urethral mobility was more active in primiparous women than in nulliparous continent controls (57.4 vs. 52.4), whereas no difference was observed on urethral mobility in the primiparous group (p = 0.25). Urethral sphincter dysfunction and funneling were present in 80% of PI women versus 22.9% in PC women (p < 0.001). Conclusion: The MRI findings revealed that de novo SUI was associated with major LAM injury, vesical neck downward movement as well as urethral sphincter dysfunction. Vesical neck funneling on sagittal images can be treated as a valuable predictor for SUI. The intervention for the PI should focus on the elevation of vesical neck, rehabilitation of LAM as well as recovery of the urethral sphincter muscle.
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Life-Cycle Reliability Evaluation of Semi-Rigid Materials Based on Modulus Degradation Model
Jiupeng Zhang,Shengchao Cui,Jun Cai,Jianzhong Pei,Yanshun Jia 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.6
The dynamic modulus of semi-rigid material is one of the important material parameters widely used in the design and evaluate ofasphalt pavement, which has a great effect on the reliability, healthy condition and service life of pavement. To show the three-phasedegradation process of dynamic modulus accurately and calculate the time-dependent reliability based on fatigue damage, thedegradation models based on non-linear fatigue damage and improved Wei-bull distribution modulus degradation are established andtestified in this paper, considering the threshold of normalized modulus. Then the reliability models based on the two abovedegradation process models are evaluated. Finally, the reliability analysis procedure is established using Monte Carlo (MC) methodand the corresponding calculation is conducted using Matlab. Cement stabilized macadam is used as an example in this paper. Results show that non-linear fatigue damage and improved Wei-bull distribution modulus degradation models can indicate threephasedegradation process of semi-rigid material modulus better and the reliability based on the proposed two models was moreaccurate to the actual situation.
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Huansen Fu,Baotong Cui,Bo Zhuang,Jianzhong Zhang 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.7
This paper addresses the anti-collision problem among mobile sensors-actuators, and settles the obstacle avoidance trouble between dynamic sensors-actuators and erratic obstacles in mobile sensor-actuator networks, which are based on a class of distributed parameter systems with time-varying delay. Initially, the radar obstacle avoidance technology is evolved into an obstacle avoidance function, combined with the anti-collision function. Subsequently, the static output feedback controller of distributed parameter systems is established. Then, by usingthe abstract development equation theory, operator semigroup approach and Lyapunov stability arguments, the stability analysis of the distributed parameter systems with time-varying delay is carried out. Moreover, an iterative and continuous control force on account of Newton’s second law is constructed, which makes anti-collision and obstacle avoidance control of mobile sensors-actuators be realized, and accelerates the state of this delayed system to be stable. Finally, numerical simulation results indicate that the proposed control strategy is effective.
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Zhiwen Shao,Qichi Le,Zhiqiang Zhang,Jianzhong Cui 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.2
Ultrasound with different powers was applied to treat AZ80 alloy melt to attain grain refinement or purifi-cation processing of the alloy. The influence of ultrasonic powers from 0 W to 1400 W on microstruc-tures of the AZ80 alloy with ultrasonic grain refinement treatment was investigated. The average grain size of the alloy could be decreased from 387 µm to 147 µm after the ultrasound with the optimal power 600 W was applied to treat the melt. The effect of ultrasonic powers from 0 W to 230 W on the inclusion distribution in the ingot that was treated by ultrasonic purification processing was also studied. The opti-mal ultrasonic power in the ultrasonic purification processing was 80 W. In order to gain insight into the mechanism by which ultrasonic power affected the microstructure of the alloy or inclusion distribution in the ingot, numerical simulations were carried out and the ultrasonic field propagation in the melt was characterized.
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