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A framework for rapid on-board deterministic estimation of occupant injury risk in motor vehicle crashes with quantitative uncertainty evaluation

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Science China(Technological Sciences) 2021年第3期64卷 521-534页

作者： BANCE Iason YANG SaiChao zhou qing LI ShengBo NIE BingBing State Key Laboratory of Automotive Safety and Energy School of Vehicle and MobilityTsinghua UniversityBeijing 100084China

Accurate on-board occupant injury risk prediction of motor vehicle crashes(MVCs)can decrease fatality rates by providing critical information timely and improving injury severity triage *** present implemented prediction algorithms in vehicle safety systems are probabilistic and rely on multi-variate logistic regression of real-world vehicle collision *** a result,they do not utilize important vehicle and occupant features and tend to overgeneralize the solution *** study presents a framework to address these problems with deterministic and computationally efficient lumped parameter model simulations driven by a database of vehicle crash tests.A 648-case mixed database was generated with finite element and multi-body models and validated under the principal directions of impact with experimental results for a single vehicle body *** the finite element database,we developed lumped parameter models for four principal modes of impact(i.e.,frontal,rear,near side and far side)with parameters identified via genetic algorithm *** obtain confidence bounds for the injury risk prediction,the parameter uncertainty and model adequacy were evaluated with arbitrary and bootstrapped polynomial chaos *** developed algorithm was able to achieve over triage rates of 17.1%±8.5%,whilst keeping the under triage rates below 8%on a finite element-multi body model database of a single vehicle body *** study demonstrated the feasibility and importance of using low-complexity deterministic models with uncertainty quantification in enhanced occupant injury risk *** research is required to evaluate the effectiveness of this framework under a wide range of vehicle *** the flexibility of parameter adjustment and high computational efficiency,the present framework is generic in nature so as to maximize future applicability in improved on-board triage decision making in active safety systems.

关键词： occupant safety injury prediction lumped parameter model motor vehicle crash uncertainty quantification

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Effective control allocation using hierarchical multi-objective optimization for multi-phase flight

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Chinese Journal of Aeronautics 2020年第7期33卷 2002-2013页

作者： Liguo SUN qing zhou Baoxu JIA Wenqian TAN Hangxu LI School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China Shanghai Aircraft Design and Research Institute Commercial Aircraft Corporation of China Ltd.Shanghai 201210China

For different flight phases in an overall flight mission,different control and allocation preferences should be pursued considering lift,drag or maneuverability *** multi-objective flight control allocation problem for a multi-phase flight mission is *** an overall flight mission,different flight phases namely climbing,cruise,maneuver and gliding phases are ***,a multi-objective control allocation problem considering drag,lift or control energy preference is ***,considering different control preferences at different flight phases,the analytic hierarchical process method is used to construct a comprehensive performance index from different objectives such as lift or drag *** active set based dynamic programming optimization method is used to solve the real-time optimization *** the validation,the Innovative Control Effector(ICE)tailless aircraft nonlinear model and the angular acceleration measurements based adaptive Incremental Backstepping(IBKS)are used to construct the validation ***,an overall flight mission is simulated to demonstrate the efficiency of the proposed multi-phase and multi-objective flight control allocation *** results show that the comprehensive performance index for different phases,which are determined from the Analytic Hierarchy Process(AHP)method,can suitably satisfy the preference requirements for different flight phases.

关键词： Adaptive control Control allocation Flying-wing aircraft Multi-phase and multi-objective Real-time optimization

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Development of small pixel HgCdTe infrared detectors

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Chinese Physics B 2019年第3期28卷 17-25页

作者： Ming Liu Cong Wang Li-qing zhou North China Research Institute of Electroptics Beijing 100015China

After approximately half a century of development, HgCdTe infrared detectors have become the first choice for high performance infrared detectors, which are widely used in various industry sectors, including military tracking, military reconnaissance, infrared guidance, infrared warning, weather forecasting, and resource detection. Further development in infrared applications requires future HgCdTe infrared detectors to exhibit features such as larger focal plane array format and thus higher imaging resolution. An effective approach to develop HgCdTe infrared detectors with a larger array format size is to develop the small pixel technology. In this article, we present a review on the developmental history and current status of small pixel technology for HgCdTe infrared detectors, as well as the main challenges and potential solutions in developing this technology. It is predicted that the pixel size of long-wave HgCdTe infrared detectors can be reduced to5 μm, while that of mid-wave HgCdTe infrared detectors can be reduced to 3 μm. Although significant progress has been made in this area, the development of small pixel technology for HgCdTe infrared detectors still faces significant challenges such as flip-chip bonding, interconnection, and charge processing capacity of readout circuits. Various approaches have been proposed to address these challenges, including three-dimensional stacking integration and readout circuits based on microelectromechanical systems.

关键词： HgCdTe infrared detector small size pixel readout circuit

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Unsteady heat-moisture transfer of wet airway in deep mining

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Journal of Central South University 2013年第7期20卷 1971-1977页

作者： WANG Yi-jiang zhou Guo-qing WU Lei State Key Laboratory for Geomechanics and Deep Underground Engineering (China University of Mining and Technology) Xuzhou 221116 China School of Mechanics and Civil Engineering China University of Mining and Technology Xuzhou 221116 China

To study the mechanism of unsteady heat-moisture transfer of wet surrounding rock in deep mining, a series of experiments with different initial and boundary conditions were carried out. Test results show that rock temperature decreases quickly at the initial stage, and reduces slowly to be a constant value finally for transient heat-moisture transfer. The quasi-steady surface temperature of wet airway is lower than that of dry airway due to the moisture transfer. The diffusion radius is less than the cooling radius owing to the large diffusion resistance. The outlet airflow enthalpy of wet airway is much larger than that of dry airway. Latent heat caused by the moisture transfer plays a significant role in a deep thermal environment. For periodic heat-moisture transfer, temperature, humidity and enthalpy of outlet airflow and rock temperature also change periodically. The wave amplitude of rock temperature decreases gradually with increasing distance away from the airway surface, and the wave phase of rock temperature is also behind that of airflow. Moreover, direction of the heat-moisture transfer between airway and airflow is bidirectional, which is different from results of transient transfer.

关键词： unsteady heat-moisture transfer wet airway deep mining moisture content airflow enthalpy

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Greedy Randomized Adaptive Search Procedure with Path-Relinking for the Vertex p-Center Problem

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Journal of Computer Science & Technology 2017年第6期32卷 1319-1334页

作者： Ai-Hua Yin Tao-qing zhou Jun-Wen Ding qing-Jie Zhao Zhi-Peng Lv School of Software and Communication Engineering Jiangxi University of Finance and Economics Nanchang 330013 China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China Department of Computer Science School of Information Engineering Zhejiang Agriculture and Forestry University Hangzhou 311300 China

The p-center problem consists of choosing a subset of vertices in an undirected graph as facilities in order to minimize the maximum distance between a client and its closest facility. This paper presents a greedy randomized adaptive search procedure with path-relinking （GRASP/PR） algorithm for the p-center problem, which combines both GRASP and path-relinking. Each iteration of GRASP/PR consists of the construction of a randomized greedy solution, followed by a tabu search procedure. The resulting solution is combined with one of the elite solutions by path-relinking, which consists in exploring trajectories that connect high-quality solutions. Experiments show that GRASP/PR is competitive with the state-of-the-art algorithms in the literature in terms of both solution quality and computational efficiency. Specifically, it virtually improves the previous best known results for 10 out of 40 large instances while matching the best known results for others.

关键词： p-center problem tabu search path-relinking facility location

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Pricing Vulnerable Options with Correlated Credit Risk Under Jump-diffusion Processes When Corporate Liabilities Are Random

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Acta Mathematicae Applicatae Sinica 2019年第2期35卷 305-318页

作者： qing zhou Jiao-jiao YANG Wei-xing WU School of Science Beijing University of Posts and Telecommunications School of Banking and Finance University of International Business and Economics

In this paper, we consider an improved model of pricing vulnerable options with credit risk. We assume that the vulnerable European options not only face default risk, but also face the rare shocks of the underlying assets and the counterparty assets. The dynamics of two correlated assets are modeled as a class of jump diffusion processes. Furthermore, we assume that the dynamic of the corporate liability is a geometric Brownian motion that is related to the underlying asset and the counterparty asset. Under this new framework,we give an explicit pricing formula of the vulnerable European options.

关键词： vulnerable option default credit risk pricing jump-diffusion

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All-solution-processed PIN architecture for ultra-sensitive and ultra-flexible organic thin film photodetectors

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Science China Chemistry 2016年第10期59卷 1258-1263页

作者： Zhiwen Jin qing zhou Peng Mao Hui Li Jizheng Wang National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences

An ideal organic thin film photodetectors(OTFPs) should adopt a hierarchical, multilayer p-type/blend-type/n-type(PIN) structure,with each layer having a specific purpose which could greatly improve the exciton dissociation while guarantee efficient charge transport. However, for the traditional layer-by-layer solution fabrication procedure, the solvent used can induce organic material mixing and molecular disordering between each layer. Hence, such architecture for OTFPs can now only be formed via thermal evaporation. In this paper, a contact-film-transfer method is demonstrated to all-solution processing organic PIN OTFPs on flexible substrates. The fabricated PIN OTFPs exhibit high photoresponse and high stability under continuous mechanical bending. Hence,the method we described here should represent an important step in the development of OTFPs in the future.

关键词： organic thin film photodetectors contact-film-transfer method PIN architecture all-solution-processed flexible

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Therapeutic revolution for inoperable stage III non-small cell lung cancer in the immune era

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Cancer Biology & Medicine 2022年第5期19卷 569-572页

作者： Jiakang Li Jingyan Xu Mingyi Yang qing zhou School of Medicine South China University of TechnologyGuangzhou 510006China Guangdong Lung Cancer Institute Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China The Second School of Clinical Medicine Southern Medical UniversityGuangzhou 510000China

The PACIFIC study ushered in a“tsunami-like”therapeutic revolution for stage III inoperable non-small cell lung cancer(NSCLC)In the past,chemoradiotherapy(CRT)has been the standard of care for inoperable stage III *** chemoradiotherapy(cCRT),if tolerable in patients,is the optimal treatment regimen.A meta-analysis has shown that cCRT results in a 5-year survival rate 4.5%longer than that with sequential chemoradiotherapy(sCRT)***,within 2 years after cCRT,approximately 30%of patients experience local recurrence,and approximately 40%develop distant *** have explored induction chemotherapy3,consolidation chemotherapy4,and combination use with targeted drugs2,and found that none improve the prognosis.

关键词： chemotherapy NSCLC drugs

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Peak of Chiral Susceptibility and Chiral Phase Transition in QED_(3)

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Chinese Physics Letters 2011年第4期28卷 63-66页

作者： zhou Yu-qing YANG Yong-Hong Department of Physics Southeast UniversityNanjing 210096

A general expression for the scalar susceptibility in QED3 is *** adopt the Dyson-Schwinger equation for the fermion propagator to solve X^(c)within a range of the number of fermion flavors,N,in chiral symmetry breaking *** show that the scalar susceptibility has a peak and the corresponding N is less than thecritical number of fermion flavors for chiral symmetry.

关键词： symmetry phase chiral

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Effects of lanthanum(Ⅲ) on nitrogen metabolism of soybean seedlings under elevated UV-B radiation

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Journal of Environmental Sciences 2007年第11期19卷 1361-1366页

作者： CAO Rui HUANG Xiao-hua zhou qing CHENG Xiao-ying The Key Laboratory of Industrial Biotechnology Ministry of Education Southern Yangtze University Wuxi 214036 China College of Chemistry and Environment Science Nanjing Normal University Nanjing 210097 China

The hydroponic culture experiments of soybean bean seedlings were conducted to investigate the effect of lanthanum （La） on nitrogen metabolism under two different levels of elevated UV-B radiation （UV-B, 280-320 nm）. The whole process of nitrogen metabolism involves uptake and transport of nitrate, nitrate assimilation, ammonium assimilation, amino acid biosynthesis, and protein synthesis. Compared with the control, UV-B radiation with the intensity of low level 0.15 W/m^2 and high level 0.45 W/m^2 significantly affected the whole nitrogen metabolism in soybean seedlings （p 〈 0.05）. It restricted uptake and transport of NO3^-, inhibited activity of some key nitrogen-metabolism-related enzymes, such as： nitrate reductase （NR） to the nitrate reduction, glutamine systhetase （GS） and glutamine synthase （GOGAT） to the ammonia assimilation, while it increased the content of free amino acids and decreased that of soluble protein as well. The damage effect of high level of UV-B radiation on nitrogen metabolism was greater than that of low level. And UV-B radiation promoted the activity of the anti-adversity enzyme glutamate dehydrogenase （GDH）, which reduced the toxicity of excess ammonia in plant. After pretreatment with the optimum concentration of La （20 mg/L）, La could increase the activity of NR, GS, GOGAT, and GDH, and ammonia assimilation, but decrease nitrate and ammonia accumulation. In conclusion, La could relieve the damage effect of UV-B radiation on plant by regulating nitrogen metabolism process, and its alleviating effect under low level was better than that under the high one.

关键词： lanthanum(Ⅲ) UV-B radiation soybean seedlings nitrogen metabolism alleviating effect

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