|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Symbolic model checking for discrete real-time systems显示文摘A considerably large class of critical applications run in distributed and real-time environments,and most of the correctness requirements of such applications must be expressed by time-critical properties.To enable the specification and verification of these properties in both qualitative and quantitative manners,we propose a new real-time temporal logic RTCTL*, by incorporating both the quantitative(bounded)future and past temporal operators from the qualitative temporal logic CTL*. First, we propose a symbolic method for constructing the temporal tester for arbitrary principally temporal formulas. A temporal tester is constructed as a non-deterministic transducer with a fresh boolean output variable, such that at any position the output variable is set to be true if and only if the corresponding formula holds starting from that position.Then we propose a symbolic model checking method for RTCTL* over finite-state transition systems with weak fairness constraints based on the compositionality of testers. The soundness and completeness of the model checking method, the expressiveness of RTCTL*, and the complexity of the tester construction are described and proven. We have already implemented an efficient model checking prototype for the real-time linear temporal logic RTLTL, which is a quantifier-free version of RTCTL*, by building upon the Nu SMV model checker. The theoretical and the experimental results from the prototype both confirm that for checking bounded temporal formulae of the form f U[0,b]g or f S[0,b]g, our method performs exponentially better than the translation-based method in Nu SMV. | Xiangyu LUO Lijun WU Qingliang CHEN Haibo LI Lixiao ZHENG Zuxi CHEN | 2018 | Science China(Information Sciences)2018，61，5： | 1 |
| 2 | Seasonal variation of fluxes and distributions of dissolved methane in the North Yellow Sea显示文摘 | YANG JING ZHANG GUILING ZHENG LIXIAO | 2010 | Continental Shelf Research2010，30，： | 1 |
| 3 | Seasonal variation of fluxes and distributions of dissolved methane in the North Yellow Sea显示文摘 | Yang Jing Zhang Guiling Zheng Lixiao | 2010 | Continental shelf research2010，30，： | 1 |
| 4 | View determinacy for preserving selected information in data transformations显示文摘 | Wenfei Fan Floris Geerts Lixiao Zheng | 2011 | Information Systems2011，，1： | 1 |
| 5 | Comparative Analysis of Proanthocyanidins and Polysaccharides on Wild Lycium ruthenicum显示文摘[Objectives] To compare content of proanthocyanidins and polysaccharides in wild Lycium ruthenicum. [Methods] The wild L. ruthenicum collected from different regions such as Qinghai, Inner Mongolia, Ningxia and Gansu Province were taken as the research objects. The conventional indicators such as proanthocyanidins and polysaccharides of the experimental materials were determined, and the proanthocyanidins and polysaccharides of the experimental materials in different regions were compared and analyzed. The difference in content and correlation, and the cluster analysis method were used to divide clusters of the experimental materials. [Results] The absorbance of proanthocyanidins in the fruit of wild L. ruthenicum was No.4>No.1>No.5>No.6>No.3>No.2, among which the absorbance of anthocyanin(2.43) of wild L. ruthenicum variety No.4 was significantly higher than other experimental materials(P<0.05), and proanthocyanidin of No.2 had the lowest absorbance value of 1.35. There was no significant difference between No.3 and No.6(P>0.05), and there were significant differences among other experimental materials(P<0.05). The content of polysaccharides was: No.3>No.7>No.2>No.4>No.5>No.6>No.1; there was no significant difference between No.3 and No.7(P>0.05), but significantly higher than other materials(P<0.05). Besides, proanthocyanidins and polysaccharides showed significant variability, but there was no consistency in the correlation between them. [Conclusions] In terms of the absorbance of proanthocyanidins, the experimental materials No.1 and No.4 can be classified into a cluster; experimental materials No.2, No.3, No.5 and No.6 can be classified into another cluster. This can provide a theoretical basis for the introduction and breeding of fine varieties. | Haijun CHEN Jiawei LIU Yumei SHAN Lijun HE Yong YANG Yan ZHENG Jie HOU Yu ZHOU Lixiao MA | 2019 | Medicinal Plant2019，10，1： | 1 |
| 6 | Single-view determinacy and rewriting completeness for a fragment of XPath queries显示文摘Dear editor,The problem of answering queries using views,where a view is a set of predefined queries,arises in a variety of data management applications.To formalize the fact that a set of views V contains enough information for answering a specific | Lixiao ZHENG Shuai MA Xiangyu LUO Tiejun MA | 2016 | Science China(Information Sciences)2016，59，9： | 0 |
| 7 | Delay-CJ:A novel cryptojacking covert attack method based on delayed strategy and its detection显示文摘Cryptojacking is a type of resource embezzlement attack,wherein an attacker secretly executes the cryptocurrency mining program in the target host to gain profits.It has been common since 2017,and in fact,it once became the greatest threat to network security.To better prove the attack ability the harm caused by cryptojacking,this paper proposes a new covert browser-based mining attack model named Delay-CJ,this model was deployed in a simulation environment for evaluation.Based on the general framework of cryptojacking,Delay-CJ adds hybrid evasion detection techniques and applies the delayed execution strategy specifically for video websites in the prototype implementation.The results show that the existing detection methods used for testing may become invalid as result of this model.In view of this situation,to achieve a more general and robust detection scheme,we built a cryptojacking detection system named CJDetector,which is based on cryptojacking process features.Specifically,it identifies malicious mining by monitoring CPU usage and analyzing the function call information.This system not only effectively detects the attack in our example but also has universal applicability.The recognition accuracy of CJDetector reaches 99.33%.Finally,we tested the web pages in Alexa 50K websites to investigate cryptojacking activity in the real network.We found that although cryptojacking is indeed on the decline,it remains a part of network security threats that cannot be ignored. | Guangquan Xu Wenyu Dong Jun Xing Wenqing Lei Jian Liu Lixiao Gong Meiqi Feng Xi Zheng Shaoying Liu | 2023 | Digital Communications and Networks2023，9，5： | 0 |
| 8 | Review of Design and Control Optimization of Axial Flux PMSM in Renewable-energy Applications显示文摘Axial flux permanent magnet synchronous motors(AFPMSMs)have been widely used in wind-power generation,electric vehicles,aircraft,and other renewable-energy applications owing to their high power density,operating efficiency,and integrability.To facilitate comprehensive research on AFPMSM,this article reviews the developments in the research on the design and control optimization of AFPMSMs.First,the basic topologies of AFPMSMs are introduced and classified.Second,the key points of the design optimization of core and coreless AFPMSMs are summarized from the aspects of parameter design,structure design,and material optimization.Third,because efficiency improvement is an issue that needs to be addressed when AFPMSMs are applied to electric or other vehicles,the development status of efficiency-optimization control strategies is reviewed.Moreover,control strategies proposed to suppress torque ripple caused by the small inductance of disc coreless permanent magnet synchronous motors(DCPMSMs)are summarized.An overview of the rotor-synchronization control strategies for disc contra-rotating permanent magnet synchronous motors(CRPMSMs)is presented.Finally,the current difficulties and development trends revealed in this review are discussed. | Jianfei Zhao Xiaoying Liu Shuang Wang Lixiao Zheng | 2023 | Chinese Journal of Mechanical Engineering2023，36，2： | 0 |
| 9 | Many-objective Optimization Method Based on Dimension Reduction for Operation of Large-scale Cooling Energy Systems显示文摘Large-scale cooling energy system has developed well in the past decade.However,its optimization is still a problem to be tackled due to the nonlinearity and large scale of existing systems.Reducing the scale of problems without oversimplifying the actual system model is a big challenge nowadays.This paper proposes a dimension reduction-based many-objective optimization(DRMO)method to solve an accurate nonlinear model of a practical large-scale cooling energy system.In the first stage,many-objective and many-variable of the large system are pre-processed to reduce the overall scale of the optimization problem.The relationships between many objectives are analyzed to find a few representative objectives.Key control variables are extracted to reduce the dimension of variables and the number of equality constraints.In the second stage,the manyobjective group search optimization(GSO)method is used to solve the low-dimensional nonlinear model,and a Pareto-front is obtained.In the final stage,candidate solutions along the Paretofront are graded on many-objective levels of system operators.The candidate solution with the highest average utility value is selected as the best running mode.Simulations are carried out on a 619-node-614-branch cooling system,and results show the ability of the proposed method in solving large-scale system operation problems. | Peng Zhu Lixiao Wang Cuiqing Wu Jinyu Yu Zhigang Li Jiehui Zheng Qing-Hua Wu | 2023 | CSEE Journal of Power and Energy Systems2023，9，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员