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Jianping Zhang,Chao Liu,Guoliang Cheng,Xiao Chen,Jionglei Wu,Qunzhi Zhu,Laichang Zhang 한국정보디스플레이학회 2014 Journal of information display Vol.15 No.2
It is currently hard to estimate the reliability parameters of organic light-emitting diodes (OLEDs) when conducting a life test at normal stress, due to the remarkably improved life of OLEDs to thousands hours. This work adopted three constant-stress accelerated life tests (CSALTs) to predict the life of white OLEDs in a short time. TheWeibull function was applied to describe the life distribution, and the shape and scale parameters were estimated using the least square method. The experimental test data were statistically analyzed using a self-developed software. The life of white OLEDs predicted via this software is ingood agreement with that reported from the customers. The numerical results indicated that the assumptions of CSALT are correct, and that CSALT can be used to predict the life of white OLEDs. This work confirmed that the life of white OLEDs meets the Weibull distribution, and that the accelerated life equation conforms to the inverse power law. Furthermore, the precise accelerated parameters were shown to be particularly useful in enabling the rapid estimation of white OLEDs’ life.
Couple-group L2-L∞ Consensus of Nonlinear Multi-agent Systems with Markovian Switching Topologies
Xiao Li,Cancan Zhou,Jianping Zhou,Zhen Wang,Jianwei Xia 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.3
The paper is devoted to the couple-group L2-L∞ consensus problem of nonlinear multi-agent systemsaffected by external disturbances. The interaction topologies among agents obey a continuous-time Markovianprocess with unknown transition probabilities. By a system transformation, the problem of couple-group L2-L∞ consensus is converted into a L2-L∞ control issue. Then, by Lyapunov stability theory and graph theory, sufficientconditions for the couple-group L2-L∞ consensus are obtained. The control gains can be acquired via the solutionsof a group of linear matrix inequalities. Moreover, the present method is extended to the multi-group L2-L∞consensus. Finally, an example is provided to illustrate the effectiveness of the results.
Jianping Jin,Xiao Liu,Shuai Yuan,Peng Gao,Yanjun Li,Hao Zhang,Xiangzhi Meng 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
Red mud and coal gangue are industrial solid wastes discharged during alumina extraction and coalmining, respectively. As these are hazardous materials, their disposal leads to serious environmentalissues. In this study, an innovative utilization of red mud through co-roasting with coal gangue forseparation and recycling of iron and aluminum minerals is presented. Under optimum co-roastingconditions (550 C for 50 min), an iron concentrate containing 57.25% TFe (total iron content) with therecovery of 65.22%, and an aluminum-rich product containing 27.26% Al2O3 with the recovery of 71.37%were obtained after magnetic separation. The characteristics of mixed raw material and products allindicated that the goethite and hematite phases in the mixed raw material were transformed into amagnetite phase after co-roasting, although some of the magnetite generated during co-roasting wasoxidized to hematite again. This study demonstrates that co-roasting of coal gangue and red mud is apromising technology for the reduction of iron and activation of aluminum to realize resource recyclingwithout additional materials
Weihua Li,Yipeng Wang,Junlong Guo,Dianbo Ren,Jianfeng Wang,Shengkai Zhu,Jianping Xiao,Shijuan Chen 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.5
This study proposes an improved artificial potential field (APF) by considering the cooperative control of local obstacle avoidance and path tracking for automated vehicles. We established the path gravitational potential field (GPF) based on the scheduled path (SP), including the lateral and longitudinal GPFs, to enable the automated vehicle to quickly return to the SP and track after obstacle avoidance, while maintaining control of speed for the entire process. To address the local optimal solution problem of the classical APF, we proposed a sub-target-point selection strategy based on the information of obstacles and SP and established the GPF of the sub-target points. Thus, the automated vehicle can avoid obstacles and quickly return to the SP. Furthermore, the relative velocity of the automated vehicle and the obstacle was used to establish the velocity repulsion potential field (RPF), which improved the adaptability of the APF to dynamic obstacles. The simulation results indicate that the improved APF is capable of cooperative control of path tracking and local obstacle avoidance. Code is available at https://github.com/xiaowang617/Improve-APF.
Caineng Cao,Jingwei Luo,Li Gao,Junlin Yi,Xiaodong Huang,Suyan Li,Jianping Xiao,Zhong Zhang,Guozhen Xu 대한암학회 2017 Cancer Research and Treatment Vol.49 No.2
Purpose This study was conducted is to identify the prognostic value and staging categories of magnetic resonance imaging (MRI)–detected intracranial extension in nasopharyngeal carcinoma (NPC) with intensity-modulated radiotherapy (IMRT) to determine whether it is necessary to subclassify the T4 classification NPC. Materials and Methods A total of 335 nonmetastatic T4 classification NPC patients with MRI treated between March 2004 and June 2011 by radical IMRT were included. The T4 classification patients were subclassified into two grades (T4a, without intracranial extension vs. T4b, with intracranial extension) according to the site of invasion. Results The frequency of intracranial extension was 40.9% (137 of 335 patients). Multivariate analysis identified subclassification (T4a vs. T4b) as an independent prognostic factor for local failure-free survival (p=0.049; hazard ratio [HR], 0.498) and overall survival (p=0.004; HR, 0.572); however, it had no effect on regional failure-free survival or distant failure-free survival (p > 0.050). Conclusion For patients with T4 classification NPC, those with MRI-detected intracranial extension are more likely to experience local failure and death after IMRT than patients without intracranial extension. According to the site of invasion, subclassification of T4 patients as T4a or T4b has prognostic value in NPC.