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Structures and Evolutions of Explosive Cyclones over the northwestern and northeastern Pacific

Journal of Ocean University of China 2018年第3期17卷 581-593页

作者： zhang Shuqin FU gang Key Laboratory of Physical Oceanography Ocean-Atmosphere Interaction and Climate Laboratory Department of Marine Meteorology Ocean University of China Division of Oceanic Dynamics and Climate Qingdao National Laboratory for Marine Science and Technology

In this study, the structures and evolutions of moderate(MO) explosive cyclones(ECs) over the northwestern Pacific(nwP) and northeastern Pacific(nEP) are investigated and compared using composite analysis with cyclone-relative coordinates. Final Operational Global Analysis data gathered during the cold seasons(October–April) of the 15 years from 2000 to 2015 are used. The results indicate that MO nwP ECs have strong baroclinicity and abundant latent heat release at low levels and strong upper-level forcing, which favors explosive cyclogenesis. The rapid development of MO nEP ECs results from their interaction with a northern cyclone and a large middle-level advection of cyclonic vorticity. The structural differences between MO nwP ECs and MO nEP ECs are significant. This results from their specific large-scale atmospheric and oceanic environments. MO nwP ECs usually develop rapidly in the east and southeast of the Japan Islands; the intrusion of cold dry air from the East Asian continent leads to strong baroclinicity, and the Kuroshio/Kuroshio Extension provides abundant latent heat release at low levels. The East Asian subtropical westerly jet stream supplies strong upper-level forcing. while MO nEP ECs mainly occur over the nEP, the low-level baroclinicity, upper-level jet stream, and warm ocean currents are relatively weaker. The merged cyclone associated with a strong middle-level trough transports large cyclonic vorticity to MO nEP ECs, which favors their rapid development.

关键词： northern Pacific explosive cyclones composite analysis structures evolutions

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Adaptive Update Distribution Estimation under Probability Byzantine Attack

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Computers, Materials & Continua 2024年第10期81卷 1667-1685页

作者： gang Long Zhaoxin zhang Faculty of Computing Harbin Institute of TechnologyHarbin150000China

The secure and normal operation of distributed networks is crucial for accurate parameter ***,distributed networks are frequently susceptible to Byzantine *** real-life scenarios,this paper investigates a probability Byzantine(PB)attack,utilizing a Bernoulli distribution to simulate the attack ***,additional detection mechanisms are used to mitigate such attacks,leading to increased energy consumption and burdens on distributed nodes,consequently diminishing operational *** from these approaches,an adaptive updating distributed estimation algorithm is proposed to mitigate the impact of PB *** the proposed algorithm,a penalty strategy is initially incorporated during data updates to weaken the influence of the ***,an adaptive fusion weight is employed during data fusion to merge the ***,the reason why this penalty term weakens the attack has been analyzed,and the performance of the proposed algorithm is validated through simulation experiments.

关键词： Distribution estimation network security least-mean-square binomial distribution probability Byzantine attack

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PUnet:A Semi-Supervised Anomaly Detection Model for network Anomaly Detection Based on Positive Unlabeled Data

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Computers, Materials & Continua 2024年第10期81卷 327-343页

作者： gang Long Zhaoxin zhang Faculty of Computing Harbin Institute of TechnologyHarbin150000China

network anomaly detection plays a vital role in safeguarding network ***,the existing network anomaly detection task is typically based on the one-class zero-positive *** approach is susceptible to overfitting during the training process due to discrepancies in data distribution between the training set and the test *** phenomenon is known as prediction ***,the rarity of anomaly data,often masked by normal data,further complicates network anomaly *** address these challenges,we propose the PUnet network,which ingeniously combines the strengths of traditional machine learning and deep learning techniques for anomaly ***,PUnet employs a reconstruction-based autoencoder to pre-train normal data,enabling the network to capture potential features and correlations within the ***,PUnet integrates a sampling algorithm to construct a pseudo-label candidate set among the outliers based on the reconstruction loss of the *** approach effectively mitigates the prediction drift problem by incorporating abnormal ***,PUnet utilizes the CatBoost classifier for anomaly detection to tackle potential data imbalance issues within the candidate *** experimental evaluations demonstrate that PUnet effectively resolves the prediction drift and data imbalance problems,significantly outperforming competing methods.

关键词： network anomaly detection representation learning candidate set CatBoost

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On the Kahler-Ricci Flow on Projective Manifolds of General Type

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Chinese Annals of Mathematics,Series B 2006年第2期27卷 179-192页

作者： gang TIAn Zhou zhang Dedicated to the memory of Shiing-Shen Chern

This note concerns the global existence and convergence of the solution for Kahler-Ricci flow equation when the canonical class, Kx, is numerically effective and big. we clarify some known results regarding this flow ... 详细信息

关键词： Geometric evolution equations Minimal model program

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Towards architecture-based management of platforms in the cloud

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Frontiers of Computer Science 2012年第4期6卷 388-397页

作者： gang HUAnG Xing CHEn Ying zhang Xiaodong zhang Key Laboratory of High Confidence Software Technologies(Ministry of Education) School of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China

System management is becoming increasingly complex and brings high costs, especially with the advent of cloud computing. Cloud computing involves numerous platforms often of virtual machines （VMs） and middleware has to be managed to make the whole system work cost- effectively after an application is deployed. In order to re- duce management costs, in particular for the manual activi- ties, many computer programs have been developed remove or reduce the complexity and difficulty of system mamnage- ment. These programs are usually hard-coded in languages like Java and C＋＋, which bring enough capability and flexi- bility but also cause high programming effort and cost. This paper proposes an architecture for developing management programs in a simple but powerful way. First of all, the man- ageability of a given platform （via APIs, configuration files, and scripts） is abstracted as a runtime model of the plat- form＇s software architecture, which can automatically and immediately propagate any observable runtime changes of the target platforms to the corresponding architecture mod- els, and vice versa. The management programs are devel- oped using modeling languages, instead of those relatively low-level programming languages. Architecture-level man- agement programs bring many advantages related to perfor- mance, interoperability, reusability, and simplicity. An experiment on a real-world cloud deployment and comparison with traditional programming language approaches demonstrate the feasibility, effectiveness, and benefits of the new model based approach for management program development.

关键词： cloud management software architecture models at runtime

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Mouse models of epithelial ovarian cancer for preclinical studies

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Zoological Research 2021年第2期42卷 153-160页

作者： Sergey Karakashev Ru-gang zhang Immunology Microenvironment&Metastasis ProgramThe Wistar InstitutePhiladelphiaPA 19104USA

Epithelial ovarian cancer(EOC) is the leading cause of gynecological cancer-related mortality in the developed world. EOC is a heterogeneous disease represented by several histological and molecular subtypes. Therefore, exploration of relevant preclinical animal models that consider the heterogenic nature of EOC is of great importance for the development of novel therapeutic strategies that can be translated clinically to combat this devastating disease. In this review, we discuss recent progress in the development of preclinical mouse models for EOC study as well as their advantages and limitations.

关键词： Epithelial ovarian cancer Patientderived xenografts Orthotopic mouse model Subcutaneous mouse model Intraperitoneal mouse model Syngeneic mouse model Genetic engineered mouse model

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Analysis of an improved acquisition method for high-dynamic BOC signal

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Journal of Systems Engineering and Electronics 2016年第6期27卷 1158-1167页

作者： Yi Pan Tianqi zhang gang zhang Zhongtao Luo Chongqing Key Laboratory of Signal and Information Processing Chongqing University of Posts and Telecommunications

To reach a compromise between short acquisition time and excellent detection probability for the high-dynamic binary offset carrier (BOC) signal, an overall algorithm based on discrete polynomial-phase transform (DPT) and partial matching filter (PMF)-fast Fourier transform (FFT) algorithm is given. The high order items of received signals are removed by the method of DPT, and the PMF-FFT algorithm is redesigned for the BOC signal. The simulation experiments and theoretical analyses verify that the improved algorithm has attained improvement in acquisition performance. © 2016 Beijing Institute of Aerospace Information.

关键词： Bins Mergers and acquisitions Titration

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Temperature effect on photolysis decomposing of perfluorooctanoic acid

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Journal of Environmental Sciences 2016年第4期28卷 126-133页

作者： Tiliang zhang gang Pan Qin Zhou Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

Perfluorooctanoic acid（PFOA）is recalcitrant to degrade and ***,the effect of temperature on the photolytic decomposition of PFOA was *** decomposition of PFOA was enhanced from 34% to 99% in 60 min of exposure when the temperature was increased from 25 to 85℃ under UV light（201–600 nm）.The limited degree of decomposition at 25℃ was due to low quantum yield,which was increased by a factor of 12 at 85℃.Under the imposed conditions,the defluorination ratio increased from 8% at 25℃ to 50% at85℃ in 60 *** of perfluorinated carboxylic acids（PFCAs,C7–C5）,PFCAs（C4–C3）and TFA（trifluoroacetic acid,C2）accelerated and attained a maximum within 30 to 90 min at 85℃.However,these reactions did not occur at 25℃ despite extended irradiation to180 *** was decomposed in a step-wise process by surrendering one *** each cyclical process,increased temperature enhanced the quantum yields of irradiation and reactions between water molecules and intermediates *** energy consumption for removing eachμmol of PFOA was reduced from 82.5 k J at 25℃ to 10.9 k J at 85℃ using *** coupled with heat achieved high rates of PFOA degradation and defluorination.

关键词： Perfluorooctanoic acid PFOA Photolysis Temperature effect

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numerical investigation of a muzzle multiphase flow field using two underwater launch methods

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Defence Technology（防务技术） 2022年第8期18卷 1454-1469页

作者： Jing-hui zhang Yong-gang Yu Xin-wei zhang School of Energy and Power Engineering Nanjing University of Science&TechnologyNanjing210094China

A two-dimensional axisymmetric model, employing a dynamic mesh and user-defined functions, is used to numerically simulate the transient multiphase flow field produced by an underwater gun. Furthermore, a visualized shooting experiment platform with a high-speed camera is built to observe the evolution process of such a multiphase flow field. The simulated phase distribution diagram is agreed well with the shadow photo of the experiment, indicating that the numerical model is reasonable. Further examinations of the multiphase flow fields by using the submerged and sealed launch methods show that use of the sealed launch can significantly improve the interior ballistic performance of an underwater gun. In the cases by using these two types of underwater launch methods, the displacement of the projectile within the range of the muzzle flow field meets the exponential law over time. Moreover, a not fully developed bottle-shaped shock wave is formed when t = 0.4 ms, but this bottle-shaped shock wave expands more rapidly for the sealed launch. In addition, the amplitude of pressure oscillation for the sealed launch is larger than that of the submerged launch, but the pressure oscillation of the sealed launch lasts shorter.

关键词： Underwater launch Multiphase flow Muzzle flow field numerical simulation Mach disk

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Effect of pile-cap connection on behavior of torsionally loaded pile groups

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第3期9卷 303-312页

作者： Ling-gang KOnG Li-min zhang Key Laboratory of Soft Soils and Geoenvironmental Engineering Ministry of Education Zhejiang University Hangzhou 310027 China Department of Civil Engineering The Hong Kong University of Science and Technology Hong Kong China

To evaluate the responses of fixed and pinned pile groups under torsion, a method is presented to analyze the nonlinear behavior of free-standing pile groups with rigid pile caps. The method is capable of simulating the nonlinear soil response in the near field usingp-y and r-θ curves, the far-field interactions through Mindlin＇s and Randolph＇s elastic solutions, and the coupling effect of lateral resistance on torsional resistance of the individual piles using an empirical factor. Based on comparisons of the solutions for fixed- and pinned-head, 1×2, 2×2, and 3×3 pile groups subjected to torsion, it was found that pile-cap connection significantly influences the torsional capacity of pile groups and the assignment of applied torques in the pile groups. In this study, the applied torques for the pinned-head pile groups are only 44%-64% of those for the corresponding fixed-head pile groups at a twist angle of 2^o. Such a difference is mainly due to the change of the lateral resistances of individual piles in the groups.

关键词： Pile group Pile foundations Torsional response Pile-cap connection nonlinear analysis

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