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Search Results: 1 - 10 of 26100 matches for " Limin Cheng "
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Latest Progress of Research on Fault Diagnosis Based on Information Fusion
Limin Cheng
Information Technology Journal , 2008,
Abstract: As we know that information fusion technology can synthetically utilize all kinds of information and remarkably improve the correctness of diagnosis finally. In order to male information fusion technology play more roles in fault diagnosis field, therefore, some contents about the basic principle, methods and fusion architectures of fault diagnosis based on information fusion in many fields are discussed in this research. At last, a conclusion is reached that it is establishing a firm foundation for the further development of information fusion for fault diagnosis.
Solving Information Fusion Problems on Unreliable Evidential Sources with Generalized DSmT
Limin Cheng,Li Kong,Xinde Li
Journal of Applied Sciences , 2006,
Abstract: How to deal with information fusion problems on unreliable evidential sources? Because the kind of fusion problem is everywhere in information society, DSmT recently developed from DST and probability theory is much more powerful than the other method (DST, etc.). However, it needs to be improved for its limitation that its author didn`t mention of solving information fusion problem on unreliable evidence source. Therefore in this study we ourselves extend DSmT and solve the fusion problem on not only equal-reliable sources of evidence, as well as unreliable evidence source. At last, An example is illustrated to verify the benefit of this kind of method and a conclusion is reached that generalized DSmT method can fuse any class information and knowledge effectively whether handing static fusion problems or dynamic fusion problems in real time directly.
大连理工大学学报 , 2010, DOI: 10.7511/dllgxb201005030
Abstract: Theissueofrobustlyexponentialstabilityforaclassofuncertainmultipletime-varyingdelaysystemswithcontrollerfailuresandnonlinearperturbationsisconsidered.Aswitcheduncertainmulti-delaysystemmodelisutilizedtodescribetheconsideredsystems.Aswitchingapproachbasedontheaveragedwelltimeisemployedfortheswitchedsystem.Adelay-dependentsufficientconditionforrobustlyexponentialstabilityoftheswitchedsystemisestablishedintermsoflinearmatrixinequalitiesbyusingtheswitchingmethod.Itisprovedtheoreticallythattheresultingclosed-loopsystemisrobustlyexponentiallystableevenifcontrollerfailuresareencountered.Theeffectivenessoftheproposedmethodisalsodemonstratedbysimulationexample.
Developing chemical signatures of particulate air pollution in the Pearl River Delta region, China

Mei Zheng,Yuan Cheng,Limin Zeng,Yuanhang Zhang,

环境科学学报(英文版) , 2011,
Abstract: PM2.5 samples were collected in a regional sampling network with three sites in Hong Kong and four sites in the adjacent inland Pearl River Delta (PRD) or Guangdong Province during four months/seasons from 2002-2003. Trans-boundary transport between Hong Kong and the inland PRD is inevitable under the influence of Asian monsoon. In summer, Hong Kong serves as the upwind site of the inland PRD while during other seasons it is under the influence of continental emissions. Previous studies have recognized the importance of using chemical signatures to differentiate local vs. regional contributions to air pollutants in Hong Kong such as the CO/NOx ratio, ratios of different VOC species. In this study, detailed chemical speciation by gas chromatography-mass spectrometry was performed with PM2.5 samples to identify new chemical signatures to distinguish aerosols in Hong Kong from those from the inland PRD. Since Hong Kong is not influenced by the continental emissions from the inland PRD during summer, comparison focused on chemical data obtained from this season for chemical signatures. The new ratios developed from the current study include LCPI/HCPI ratio of alkanes (0.39 +/- 0.02 in Hong Kong vs. 0.78 +/- 0.08 in the inland PRD), pyrene to benzoghi]perylene ratio (0.97 +/- 0.21 in Hong Kong compared to 0.20 +/- 0.06 in the inland PRD), and the ratio of 1,2-benzenedioic acid to 1,4-benzenedioic acid (1.8 +/- 0.1 in Hong Kong vs. 0.6 +/- 0.05 in the inland PRD). Results from this study also revealed that Hong Kong was impacted by ship emissions as reflected by substantially high V/Ni ratio (9 +/- 2) while this ratio was about 1-2 at all sites in the inland PRD, which is very close to typical ratios from residual oil combustion.
Stability and Maximum Delay Bound of Networked Control Systems with Multi-Step Delay
Limin Cheng,Li Kong,Changlin Ma,Xiaoling Zhu
Information Technology Journal , 2007,
Abstract: A new method to obtain a maximum delay bound of networked control systems whose network-induced delay is longer than a sampling period is proposed in terms of linear matrix inequalities, which is shown to render corresponding system asymptotically stable. Simulation results verify the correctness of the proposed theory.
A Certificate-Path Construction Algorithm Based on CA Quantification
Xin Wang,Limin Cheng,Hua Jiang,Jianming Liu
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: Certificate-path construction is a procedure to generate logical links between PKI users. In this study, we designed a value to quantify a given CA (Certificate Authority) and the value is used as a reference in path constructing process. Then a reverse certificate-path construction algorithm is described. The affections of this quantification are discussed by applying the new algorithm in selected PKI structures. After all, the result of those experiments indicates the new algorithm have improvements compares with the breadth-first search algorithm.
The Relationship between Seven Common Polymorphisms from Five DNA Repair Genes and the Risk for Breast Cancer in Northern Chinese Women
Peijian Ding, Yang Yang, Luyang Cheng, Xuejun Zhang, Limin Cheng, Caizhen Li, Jianhui Cai
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0092083
Abstract: Background Converging evidence supports the central role of DNA damage in progression to breast cancer. We therefore in this study aimed to assess the potential interactions of seven common polymorphisms from five DNA repair genes (XRCC1, XRCC2, XRCC3, XPA and APEX1) in association with breast cancer among Han Chinese women. Methodology/Principal Findings This was a case-control study involving 606 patients diagnosed with sporadic breast cancer and 633 age- and ethnicity-matched cancer-free controls. The polymerase chain reaction - ligase detection reaction method was used to determine genotypes. All seven polymorphisms were in accordance with Hardy-Weinberg equilibrium in controls. Differences in the genotypes and alleles of XRCC1 gene rs25487 and XPA gene rs1800975 were statistically significant between patients and controls, even after the Bonferroni correction (P<0.05/7). Accordingly, the risk for breast cancer was remarkably increased for rs25487 (OR = 1.28; 95% CI: 1.07–1.51; P = 0.006), but decreased for rs1800975 (OR = 0.77; 95% CI: 0.67–0.90; P = 0.001) under an additive model at a Bonferroni corrected alpha of 0.05/7. Allele combination analysis showed higher frequencies of the most common combination C-G-G-C-G-G-G (alleles in order of rs1799782, rs25487, rs3218536, rs861539, rs1800975, rs1760944 and rs1130409) in controls than in patients (PSim = 0.002). In further interaction analysis, two-locus model including rs1800975 and rs25487 was deemed as the overall best model with the maximal testing accuracy of 0.654 and the cross-validation consistency of 10 out of 10 (P = 0.001). Conclusion Our findings provide clear evidence that XRCC1 gene rs25487 and XPA gene rs1800975 might exert both independent and interactive effects on the development of breast cancer among northern Chinese women.
Chaos Control in a Discrete Ecological System  [PDF]
Limin Zhang, Chaofeng Zhang
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2012, DOI: 10.4236/ijmnta.2012.13011
Abstract: In research [1], the authors investigate the dynamic behaviors of a discrete ecological system. The period-double bifurcations and chaos are found in the system. But no strategy is proposed to control the chaos. It is well known that chaos control is the first step of utilizing chaos. In this paper, a controller is designed to stabilize the chaotic orbits and enable them to be an ideal target one. After that, numerical simulations are presented to show the correctness of theoretical analysis.
Research into Liyuan Buildings, the Spatial Composition of Liyuan Blocks and Liyuan Residents’ Lifestyles in Qingdao, China  [PDF]
Limin Shao, Hiroyuki Kanekiyo
Art and Design Review (ADR) , 2013, DOI: 10.4236/adr.2013.12002

Qingdao lies in the south of Shandong Peninsula, on the coast of the Yellow Sea. As a coastal and hilly city, Qingdaohas topographic features consisting of twisted coastlines dotted with capes and bays. The beginning of the 20th century witnessed the construction of western-style streets and buildings in Qingdao when it was occupied by Germany. Liyuan is the name of the residential buildings for Chinese labors during the German occupation. Liyuan retain the spatial composition of Chinese quadrangles (Siheyuan), and at the same time feature western technology. Therefore they have both Chinese and western flavors. In addition, they are the earliest urban residential complexes in China. The space system of Liyuan blocks has played an important role in the lifestyle and social network of the local residents. Liyuans have been home to Qingdao people from generation to generation, which makes it a spiritual symbol. Owing to its history and characteristics, Liyuan architecture has been designated as one of the historical and cultural protected areas in Qingdao, and has contributed to the formation of a distinctive geographical landscape. Since the 1980s, urban renewal and redevelopment in Qingdao have greatly impacted upon the protection of Liyuans, which has aroused concern from various communities.This research on Liyuans shows the geographic location of all the Liyuan blocks, classifies them in terms of courtyard composition and architectural features, and analyzes the relationship between their spatial composition and the residents’ life-style.

Banana Peel Carbon that Containing Functional Groups Applied to the Selective Adsorption of Au(III) from Waste Printed Circuit Boards  [PDF]
Huajun Zheng, Limin Wang
Soft Nanoscience Letters (SNL) , 2013, DOI: 10.4236/snl.2013.32006

This paper reports a kind of banana peel carbon (BPC) containing -OH, -NH2 functional groups which prepared through controlling carbonization temperature and its application on the selective adsorption of gold from waste printed circuit boards (PCBs). The adsorption of BPC for Au(III) reached equilibrium in 30 min and the adsorption of Au(III) was favorable at pH 2.5. Meanwhile, the adsorption isotherm showed the maximum adsorption capacity of 801.7 mg/g for Au(III). The results displayed that BPC had a strong selectivity for Au(III) and a negligible affinity to base metal ions, such as Cu(II), Ni(II), Fe(III) and Pb(II). The BPC adsorbent, which absorbed gold, can be recovered completely by HCl-thiourea solution.

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