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Wuhan University Journal of Natural Sciences 2004年第1期9卷 68-72页

作者： LuoJuan caoyang HeZheng LiFeng SchoolofElectronicInformation WuhanUniversity.Wuhan430072HubeiChina StateKeyLaboratoryofSoftwareEngineering WuhanUniversityWuhan430072HubeiChina

Despite the rapid evolution in all aspects of computer technology, both the computer hardware and software are prone to numerous failure conditions. In this paper, we analyzed the characteristic of a computer system and the methods of constructing a system, proposed a communication link management model supporting high availability for network applications, Which will greatly increase the high availability of network applications. Then we elaborated on heartbeat or service detect, fail-over, service take-over, switchback and error recovery process of the model. In the process of constructing the communication link, we implemented the link management and service take-over with high availability requirement, and discussed the state and the state transition of building the communication link between the hosts, depicted the message transfer and the start of timer. At Last, we applied the designed high availability system to a network billing system, and showed how the system was constructed and implemented, which perfectly satisfied the system requirements. Key words high availability - service take-over - fail-over - communication link management CLC number TP 393 Foundation item: Supported by the National Natural Science Foundation of China (60132030)Biography: Luo Juan (1974-), female, Ph. D candidate, research direction: high speed network and information security.

关键词： high availability service take-over fail-over communication link management

Implementation of Transaction Level AMBA Bus Models Using SystemC

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Wuhan University Journal of Natural Sciences 2004年第2期9卷 198-202页

作者： HeZhen caoyang ZhangJun-xin MaQin-sheng SchoolofElectronicInformation WuhanUniversityWuhan430072HubeiChina StateKeyLaboratoryofSoftwareEngineering WuhanUniversityWuhan430072HubeiChina

This paper deals with how to implement AMBA bus transaction level modeling in SystemC. There are two main techniques used in the whole modeling process, which consist of starting the platform modeling at the transaction level and using the uniformed modeling language— System C. According to the concepts of interface, port and hierarchical channel introduced in SystemC 2.0, the system of master-channel (AMBA bus) slave is created as the architecture of the AMBA bus transaction level model, which can make it more extendable. The port and interface classes of the model that are prone to program are defined in accordance with the SoC hierarchical design methodology. In addition, method calls, not signal communication, are used between different modules in the model, so the higher-level abstraction is achieved and the simulation performance is improved. The AMBA bus transaction level model is analyzed and certified by simulation experiment, and proved to be completely compliant to the AMBA specification 2.0. Key words AMBA - transaction level - SystemC - SoC CLC number TP 393 Foundation item: Supported by the National High Technology Development 863 Program of China (2002AA1Z1490)Biography: He Zhen (1979-), male, Master candidate, research direction: system level modeling in SoC hardware/software co-design.

关键词： AMBA transaction level SystemC SoC

Preparation and Structural Characterization of Superionic Conductor RbAg4I5 Crystalline Grain Film

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Chinese Physics Letters 2003年第5期20卷 756-758页

作者： XINGZhi GUOJi-Hua caoyang SUNHong-San SUNJia-Lin TIANGuang-Yan DepartmentofChemistry TsinghuaUniversityBeijing100084 KeyLaboratoryofAtomicandMolecularNanosciencesofEducationMinistryandDepartmentofPhyiscs TsinghuaUniversityBeijing100084 LaboratoryofCAAD TsinghuaUniversityBeijing100084

Superionic conductor RbAg4I5 crystalline grain films were prepared by vacuum thermal evaporation on NaCl crystalline substrates. The surface morphology, microstructure and the electronic energy states of the films were examined by atomic force microscopy, transmission-electron microscopy, x-ray diffraction and x-ray photoelectron spectroscopy. The results show that the obtained RbAg4I5 layer has an epitaxial film of perfect crystalline structure, and the unit cell of crystalline grain RbAg4I5 films belongs to cubic crystal system. The principal x-ray diffraction peaks at d = 3.7447 and 1.8733 Å are related to the structure of ternary compound RbAg4I5 films.

关键词：结构分析 RbAg4I5晶体铷银碘化合物表面形貌微观结构电子能量薄膜生长 X射线衍射

A Novel Immune System Model and Its Application to Network Intrusion Detection

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Wuhan University Journal of Natural Sciences 2003年第02A期8卷 393-398页

作者： LingJun caoyang YinJian-hua HuangTian-xi SchoolofElectronicInformation WuhanUniversityWuhan430072HubeiChina StateKeyLaboratoryofSoftwareEngineering WuhanUniversityWuhan430072HubeiChina

Based on analyzing the techniques and architecture of existing network Intrusion Detection System (IDS), and probing into the fundament of Immune System (IS), a novel immune model is presented and applied to network IDS, which is helpful to design an effective IDS. Besides, this paper suggests a scheme to represent the self profile of network. And an automated self profile extraction algorithm is provided to extract self profile from packets. The experimental results prove validity of the scheme and algorithm, which is the foundation of the immune model.

关键词： Key words network Intrusion Detection System 5 Immune System self profile automated self profile extraction algorithm

RED-DTB: A Dual Token Bucket Based Queue Management Algorithm

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Wuhan University Journal of Natural Sciences 2003年第2A期8卷 388-392页

作者： YinJian-hua caoyang LingJun HuangTian-xi SchoolofElectronicInformation WuhanUniversityWuhan430072HubeiChina StateKeyLaboratoryofSoftwareEngineering WuhanUniversityWuhan430072HubeiChina

Improving the Quality of Service (QoS) of Internet traffic is widely recognized as a critical issue for the next-generation networks. In this paper, we present a new algorithm for the active queue management, namely RED-DTB. This buffer control technique is used to enforce approximate fairness among a large number of concurrent Internet flows. Like RED (Random Early Detection) algorithm, the RED-DTB mechanism can be deployed to actively respond to the gateway congestion, keep the gateway in a healthy state, and protect the fragile flows from being stolen bandwidth by greedy ones. The algorithm is based on the so-called Dual Token Bucket (DTB) pattern. That is, on the one hand, every flow is rate-limited by its own token bucket, to ensure that it can not consume more than its fair share of bandwidth; On the other hand, to make some compensations to less aggressive flows, such as connections with larger round trip time or smaller sending window, and to gain a relatively higher system utilization coefficient, all flows, depending on their individual behavior, may have a chance to fetch tokens from the public token bucket when they run out of their own share of tokens. The algorithm is analyzed and evaluated by simulations, and is proved to be effective in protecting the gateway buffer and controlling the fair allocation of bandwidth among flows.

关键词： Key words congestion control active queue management Dual Token Bucket fair bandwidth allocation network simulation

Diving dynamics identification and motion prediction for marine crafts using field data

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Journal of Ocean Engineering and Science 2024年第4期9卷 391-400页

作者： Yiming Zhong caoyang Yu Yulin Bai Zheng Zeng Lian Lian School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China Key Laboratory of Polar Ecosystem and Climate Change Ministry of EducationShanghai Jiao Tong UniversityShanghai 200030China Shanghai Key Laboratory of Polar Life and Environment Sciences Shanghai Jiao Tong UniversityShanghai 200030China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Ensuring accurate parameter identification and diving motion prediction of marine crafts is essential for safe navigation,optimized operational efficiency,and the advancement of marine *** this,this paper proposes an instrumental variable-based least squares(IVLS)***,aiming to balance complexity with accuracy,a decoupled diving model is constructed,incorporating nonlinear actuator characteristics,inertia coefficients,and damping ***,a discrete parameter identification matrix is designed based on this dedicated model,and then a IVLS algorithm is innovatively derived to reject measurement ***,the stability of the proposed algorithm is validated from a probabilistic point of view,providing a solid theoretical ***,performance evaluation is conducted using four depth control datasets obtained from a piston-driven profiling float in Qiandao Lake,with desired depths of 30 m,40 m,50 m,and 60 *** on the diving dynamics identification results,the IVLS algorithm consistently shows superior performance when compared to recursive weighted least squares algorithm and least squares support vector machine algorithm across all depths,as evidenced by lower average absolute error(AVGAE),root mean square error(RMSE),and maximum absolute error values and higher determination coefficient(R2).Specifically,for desired depth of 60 m,the IVLS algorithm achieved an AVGAE of 0.553 m and RMSE of 0.655 m,significantly outperforming LSSVM with AVGAE and RMSE values of 8.782 m and 11.117 m,***,the IVLS algorithm demonstrates a remarkable generalization capability with R2 values consistently above 0.95,indicating its robustness in handling varied diving dynamics.

关键词： Marine craft Parameter identification Motion prediction Instrumental variable-based least-squares algorithm Diving dynamics model

Wall Cracks Detection in Aerial Images Using Improved Mask R-CNN

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Computers, Materials & Continua 2022年第10期73卷 767-782页

作者： Wei Chen caoyang Chen Mi Liu Xuhong Zhou Haozhi Tan Mingliang Zhang College of Civil Engineering Changsha University of Science and TechnologyChangsha410114China College of Civil Engineering Chongqing UniversityChongqing730000China Department of Civil and Environmental Engineering University of AucklandAuckland1010New Zealand Hunan Construction Engineering Group Co.Ltd. Changsha410004China

The present paper proposes a detection method for building exterior wall cracks since manual detection methods have high risk and low *** proposed method is based on Unmanned Aerial Vehicle(UAV)and computer vision ***,a crack dataset of 1920 images was established using UAV to collect the images of a residential building exterior wall under different lighting ***,the average crack detection precisions of different methods including the Single Shot MultiBox Detector,You Only Look Once v3,You Only Look Once v4,Faster Regional Convolutional Neural Network(R-CNN)and Mask R-CNN methods were ***,the Mask R-CNN method with the best performance and average precision of 0.34 was ***,based on the characteristics of cracks,the utilization ratio of Mask R-CNN to the underlying features was improved so that the average precision of 0.9 was *** was found that the positioning accuracy and mask coverage rate of the proposed Mask R-CNN method are greatly ***,it will be shown that using UAV is safer than manual detection because manual parameter setting is not *** addition,the proposed detection method is expected to greatly reduce the cost and risk of manual detection of building exterior wall cracks and realize the efficient identification and accurate labeling of building exterior wall cracks.

关键词： Exterior wall cracks object detection mask R-CNN DenseNet

BASIC FIBROBLAST GROWTH FACTOR GENE TRANSFECTION TO ENHANCE THE REPAIR OF AVASCULAR NECROSIS OFTHE FEMORAL HEAD

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Chinese Medical Sciences Journal 2004年第2期19卷 111-115页

作者： caoyang Shu-huaYang Jing-yuanDu JinLi Wei-huaXu Yu-fangXiong DepartmentofOrthopedics UnionHospitalHuazhongUniversityofScienceandTechnologyWuhan430022 DepartmentofBiochemistry TongjiMedicalCollegeHuazhongUniversityofScienceandTechnologyWuhan430022

Objective To explore a new method for the therapy of avascular necrosis of the femoral head. Method The recombinant plasmid pCD-rbFGF was mixed with collagen and was implanted in the necrotic femoral head. Expression of basic fibroblast growth factor (bFGF) was examined by RT-PCR and immunohistochemical method. Re-pair of the femoral head was observed by histological and histomorphometric analysis. Result Expression of bFGF was detected in the femoral head transfected with bFGF gene, indicating significant increase of angiogenesis 2 weeks after gene transfection and increased new bone formation 8 weeks after gene transfection on histom-orphometric analysis (P< 0.01). Conclusion Transfection of bFGF gene enhances bone tissue angiogenesis. Repair in osteonecrosis would be accelerated accordingly.

关键词： basic fibroblast growth factor gene transfection avascular necrosis femoral head

Energy Based Ultra-Wideband Multipath Routing Algorithm in Ad Hoc Sensor Networks

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China Communications 2011年第2期8卷 159-165页

作者：刘婕曹阳 School of Electronic and Information Wuhan University State Key Laboratory of Software Engineering Wuhan University

The Energy based Ultra-Wideband Multipath Routing(EUMR) algorithm for Ad hoc sensor network is proposed. It utilizes the function of UWB positioning to reduce the network communication delay and route overhead. Furthermore,the algorithm considers energy consumption,the residual energy and node hops of communication paths to make energy consumption more balanced and extend the network lifetime. Then routing which is stable,energy-saving and low-delay is realized. Simulation results show that the algorithm has better performance on saving energy,route overhead,stability and extending network lifetime.

关键词： UWB multipath ad hoc network energy EUMR