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| 1 | Collision Avoidance Strategy Supported by LTE-V-Based Vehicle Automation and Communication Systems for Car Following显示文摘We analyzed and improved a collision avoidance strategy, which was supported by Long Term EvolutionVehicle(LTE-V)-based Vehicle-to-Vehicle(V2 V) communication, for automated vehicles. This work was completed in two steps. In the first step, we analyzed the probability distribution of message transmission time, which was conditional on transmission distance and vehicle density. Our analysis revealed that transmission time exhibited a near-linear increase with distance and density. We also quantified the trade-off between high/low resource reselection probabilities to improve the setting of media access parameters. In the second step, we studied the required safety distance in accordance with the response time, i.e., the transmission time, derived on the basis of a novel concept of Responsibility-Sensitive Safety(RSS). We improved the strategy by considering the uncertainty of response time and its dependence on vehicle distance and density. We performed theoretical analysis and numerical testing to illustrate the effectiveness of the improved robust RSS strategy. Our results enhance the practicability of building driverless highways with special lanes reserved for the exclusive use of LTE-V vehicles. | Jiayang Li Yi Zhang Mengkai Shi Qi Liu Yi Chen | 2020 | Tsinghua Science and Technology2020，25，1： | 5 |
| 2 | Application-Oriented Performance Comparison of 802.11p and LTE-V in a V2V Communication System显示文摘In recent years, the Vehicle-to-Vehicle(V2V) communication system has been considered one of the most promising technologies to build a much safer and more efficient transportation system. Both simulation and field test have been extensively performed to evaluate the performance of the V2V communication system. However,most of the evaluation methods are communication-based, and although in a transportation environment, lack a V2V application-oriented analysis. In this study, we conducted real-world tests and built an application-oriented evaluation model. The experiments were classified into four scenarios: static, following, face 2 face, and crossing vertically, which almost covered all the V2V communication patterns on the road. Under these scenarios, we conducted experiments and built a probability model to evaluate the performance of 802.11p and LTE-V in safetyrelated applications. Consequently, we found out that improvements are still needed in Non-Line-of-Sight scenarios. | Mengkai Shi Yi Zhang Danya Yao Chang Lu | 2019 | Tsinghua Science and Technology2019，24，2： | 4 |
| 3 | Nonlinear Optical Properties of Perfectly Polarized KIO_(3) Single Crystal显示文摘The nonlinear optical properties of a perfectly polarized KIO^single crystal were investigated.The principal refractive indices and nonlinear optical coefficients have been measured.The results are as follows:n1=1.6967,n2=1-8329,n3=1.8358 for 0.5893μm;d_(31)=1.2|d_(31)(LiIO_(3))|,d_(32)=1.8|d_(31)(LiIO_(3))|.The in tensity of the frequency-doubled light of the KIO_(3 )single crystal with 2.96 mm thickness is 1.2 times as large as that of the KTP single crystal with the same thickness. | YIN Xin LU Mengkai ZHANG Shaojun LI Fuqi | 1992 | Chinese Physics Letters1992，9，2： | 2 |
| 4 | Modeling and Simulation of Packet Delivery Rate in LTE-V Network Based on Markov Chain显示文摘As one of the most promising communication technologies for vehicular networks, LTE-V has the advantages of wide coverage and a high transmission rate. 3 GPP released the technical specification of LTE-V in March 2017, launching a spate of related research and industrialization. In this paper, we propose a communication model based on Markov process to evaluate the reliability of LTE-V. We derived the Packet Delivery Rate(PDR) of LTE-V based on the model. Moreover, we use Poisson process to model the distribution of vehicles on a highway,then combine the communication model with the vehicles’ distribution to derive the PDR under this scenario. To verify the correctness of the proposed model, we established a simulation program on the MATLAB platform. By comparing the simulation results and the mathematical results, we found that simulation results are a very good fit for the model. | Mengkai Shi Yaohan Tang Xiangyun Zhang Yi Zhang Jun Xu | 2020 | Tsinghua Science and Technology2020，25，3： | 2 |
| 5 | RNA binding protein 24 deletion disrupts global alternative splicing and causes dilated cardiomyopathy显示文摘RNA splicing contributes to a broad spectrum of posttranscriptional gene regulation during normal development, as well as pathological manifestation of heart diseases. However, the functional role and regulation of splicing in heart failure remain poorly understood. RNA binding protein (RBP), a major component of the splicing machinery, is a critical factor in this process. RNA binding motif protein 24 (RBM24) is a tissue-specific RBP which is highly expressed in human and mouse heart. Previous studies demonstrated the functional role of RBM24 in the embryonic heart development. However, the role of RBM24 in postnatal heart development and heart disease has not been investigated. In this paper, using conditional RBM24 knockout mice, we demonstrated that ablation of RBM24 in postnatal heart led to rapidly progressive dilated cardiomyopathy (DCM), heart failure, and postnatal lethality. Global splicing profiling revealed that RBM24 regulated a network of genes related to cardiac function and diseases. Knockout of RBM24 resulted in misregulation of these splicing transitions which contributed to the subsequent development of cardiomyopathy. Notably, our analysis identified RBM24 as a splice factor that determined the splicing switch of a subset of genes in the sacomeric Z-disc complex, including Titin, the major disease gene of DCM and heart failure. Together, this study identifies regulation of RNA splicing by RBM24 as a potent player in remodeling of heart during postnatal development, and provides novel mechanistic insights to the pathogenesis of DCM. | Jing Liu Xu Kong Mengkai Zhang Xiao Yang Xiuqin Xu | 2019 | Protein & Cell2019，10，6： | 2 |
| 6 | Degradation of micropolluants in flow-through VUV/UV/H2O2 reactors: Effects of H2O2 dosage and reactor internal diameter显示文摘The degradation of atrazine (ATZ),sulfamethoxazole (SMX) and metoprolol (MET) in flowthrough VUV/UV/H2O2reactors was investigated with a focus on the effects of H2O2dosage and reactor internal diameter (ID).Results showed that the micropollutants were degraded efficiently in the flow-through VUV/UV/H2O2reactors following the pseudo first-order kinetics (R2>0.92).However,the steady-state assumption (SSA) kinetic model being vital in batch reactors was found invalid in flow-through reactors where fluid mixing was less sufficient.With the increase of H2O2dosage,the ATZ removal efficiency remained almost constant while the SMX and MET removal was enhanced to different extents,which could be explained by the different reactivities of the pollutants towards HO·.A larger reactor ID resulted in lower degradation rate constants for all the three pollutants on account of the lower average fluence rate,but the change in energy efficiency was much more complicated.In reality,the electrical energy per order (EEO) of the investigated VUV/UV/H2O2treatments ranged between 0.14–0.20,0.07–0.14 and 0.09–0.26 k Wh/m3/order for ATZ,SMX and MET,respectively,with the lowest EEOfor each pollutant obtained under varied H2O2dosages and reactor IDs.This study has demonstrated the efficiency of VUV/UV/H2O2process for micropollutant removal and the inadequacy of the SSA model in flow-through reactors,and elaborated the influential mechanisms of H2O2dosage and reactor ID on the reactor performances. | Lumeng Zhan Wentao Li Li Liu Tao Han Mengkai Li Zhimin Qiang 无 | 2021 | Journal of Environmental Sciences2021，33，12： | 2 |
| 7 | Synthesis and photoluminescence properties of a new red emitting phosphor: Ca3(VO4)2 : Eu^3+; Mn^2+ 显示文摘 | Zhang Haiping Lu Mengkai Xiu Zhiliang | 2007 | Mater Res Bull2007，42，6： | 1 |
| 8 | The Stagnant Export Upgrading in Northeast China:Evidence from Value-added Tax Reform显示文摘China's 2004 value-added tax(VAT)pilot reform in the Northeast region,which changed the VAT from production type to consumption type,introduced a sizable tax credit for fixed investment in manufacturing industries,leading to more investment and higher productivity at firm level.This paper,however,uses difference-in-difference estimation and finds a negative structural effect;that is,the VAT pilot reform leads to a reduction in the export sophistication of Northeast cities relative to other cities in China,and the results hold for a battery of robustness checks.It is found that resources are reallocated towards less-sophisticated industries.As the products with higher export sophistication are more skill and research and development(R&D)intensive,the shortfalls of skilled labor and R&D spending hinder the upgrading process.With a new round of revitalization plans in the Northeast,policymakers should be cautious with similar structural effects and focus on increasing skilled labor supply and R&D investment. | Yan Du Mengkai Yang Jing Li Yunong Li | 2020 | China & World Economy2020，28，4： | 1 |
| 9 | Evaluation and Comparative Study of Industrial Competitiveness in the Beijing-Tianjin-Hebei Area显示文摘With the industrial competitiveness in the Beijing-Tianjin-Hebei area in 2013 as the object of study,this paper uses principal component analysis to evaluate and compare the industrial competitiveness in the Beijing-Tianjin-Hebei area,in order to provide reference for Beijing-Tianjin-Hebei joint development. The results show that in terms of industrial structure competitiveness,Beijing > Tianjin > Hebei; in terms of agricultural competitiveness,Tianjin > Beijing > Hebei; in terms of industrial competitiveness,Tianjin > Beijing > Hebei; in terms of service industry competitiveness,Tianjin > Beijing > Hebei; in terms of high-tech industry competitiveness,Beijing > Tianjin > Hebei. It is suggested that Beijing-Tianjin-Hebei should further optimize industrial structure,and develop modern service industry. In the Beijing-TianjinHebei joint development,Hebei should focus on the development of agriculture,Tianjin should focus on the development of industry,and Beijing should focus on the development of high-tech industry. | Mengkai WANG | 2016 | Asian Agricultural Research2016，8，10： | 1 |
| 10 | Significance of RBP4 in patients with gestational diabetes mellitus:a case-control study of Han Chinese women显示文摘 | Zhaoxia L Mengkai D Qin F | 2014 | Gynecol Endocrinol2014，30，2： | 1 |
| 11 | Combustion synthesis and luminescent properties of Dy3+-doped La2Sn2O7 nanocrystals 显示文摘 | Wang Shumei Xiu Zhiliang Ltl Mengkai | 2007 | Materials Science and Engineering: B2007，143，123： | 1 |
| 12 | Nanorods of La:Sn207 synthesized in ethanol solvent 显示文摘 | Wang Shumei Zhou Guangjun Lu Mengkai etal | 2006 | Journal of Alloys and Compounds2006，424，12： | 1 |
| 13 | Preparation and photocatalytic properties of Zr4+ doped TiO2 nanocrystals显示文摘 | Wang Yanmin Liu Suwen Lu Mengkai | 2004 | Journal of Molecular Catalysis A:Chemical2004，215，12： | 1 |
| 14 | Growth,Spectra and Influence of Annealing Effect on Laser Properties of Nd:YVO4 Crystal显示文摘 | Zhang Huaijin Meng Xianlin Zhu Li Wang Changqing Chow Y T Lu Mengkai | 2000 | Optical Materials2000，14，： | 1 |
| 15 | Photoluminescence properties ofZnS nanoparticles co-doped with Pb^2+ and Cu^2+显示文摘 | Ping Yang Mengkai LU Dong XU | 2001 | Chemical Physics Letters2001，336，： | 1 |
| 16 | Preparation and photocatalytic properties of Zr^4+ - doped TiO2 nanocrystals 显示文摘 | WANG Yanmin LIU Suwen LU Mengkai | 2004 | Journal of Molecular Catalysis A : Chemical2004，215，： | 1 |
| 17 | Pho- toluminescence of Cu+-doped and Cu2+-doped ZnS nanocrystallites显示文摘 | Yang Ping Song ChunfengsLv Mengkai | 2002 | Journal of Physics and Chemis- tiy of Solids2002，63，4： | 1 |
| 18 | Luminescence properties of Sr5 ( PO4 ) 3 Cl : Ni^2 + nanocrystals 显示文摘 | Xiu Zhiliang Lu Mengkai Liu Suwen Zhang Haiping Zhou Guangjun | 2006 | Materials Letters2006，60，： | 1 |
| 19 | Enhanced blue emission from Eu, Dy co-doped sol-gel Al2O3-SiO2 glasses 显示文摘 | Song Chunfeng Yang Ping Lu Mengkai | 2003 | Journal of Physics and Chemistry of Solids2003，64，： | 1 |
| 20 | Synthesis of zirconium sols and fibers by electrolysis of zirconium oxychloride显示文摘 | Tao He Xiuling Jiao Dairong Chen Mengkai Lü Duorong Yuan Dong Xu | 2001 | Journal of Non-Crystalline Solids2001，，1： | 1 |
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