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    Research on Schedule Management Method Based on Critical Chain Technology by MA Di, GUAN Xiaodi, WANG Wenjin, WEI Huanhuan, ZHU Yongfeng

    Published 2022-01-01
    “…Critical chain technology is a new method of project schedule management.In recent years,scholars at home and abroad have increasingly studied this technology.The research on critical chain technology mainly focuses on solving the problems of inter-project operation slack and construction delay caused by unreasonable buffer setting.In this paper,the information entropy theory is employed to build a new buffer setting model that comprehensively considers overall complexity entropy,individual complexity entropy,construction difficulty entropy,resource constraint entropy,and decision-maker preference factor.The root variance method is adopted to improve the buffer calculation formula.Then,the redundant buffer is integrated into the project buffer,and the buffer setting model is modified by absorbing possible risks.Finally,an example is discussed to verify the practicability of the model.The research shows that the proposed model can quantify the impact of risk factors on project schedule more reasonably and comprehensively,improve the accuracy of buffer setting,and effectively solve the series of problems caused by excessive import buffer.…”
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    Design and Characteristic Research of the Spindle Box of Vertical Machining Center by Gao Dongqiang, Yang Lei, Sun Qian, Zhang Xifeng

    Published 2015-01-01
    “…Headstock is the key components of the high speed vertical machining center,its static stiffness,dynamic characteristics has great effect on machining precision and stability of machining center.Taking DVG850 high speed vertical machining center spindle box as the research object,the design scheme of geometrical model of four kinds of different structure of spindle box is established,by using the finite element simulation software,the simulating calculation of the statics,modal and harmonic response of the spindle box are carried out,the resonance region of spindle box under static stiffness,natural frequency,vibration mode and the excitation frequency are got.Through the comparison analysis of finite element simulation of cloud and data,known that scheme two rib structure is the best layout,it is indicated that the research method can be to improve the spindle box structure natural frequency and increase the structure stiffness.provides the basis for avoiding resonance,for other machine tool spindle box the theory basis for optimization of structural design and improvement is provided,the design cycle can be shorten.…”
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    THE TECHNIQUE OF RESEARCH OF THE DEMPPING PROPERTIES OF THE ADAPTIVE AMORTIZOR WITH THE CONTROLLING THROTTLE by V. S. Konchak, S. V. Hitrikov, D. A. Shvets, Y. A. Bahdanau, V. L. Efremov

    Published 2017-10-01
    “…The research of the designed sample of the adaptive shock absorber, designed forthe use in the systems of cushioning of trucks operating in off-road conditions is considered. …”
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    The importance of field research in efficient water use in Kashkadarya region by Matyakubov B., Yakhyoev O., Karabayev A., Altmishev A.

    Published 2025-01-01
    “…Based on this, it is stated that 22% of the total area of Kashkadarya region is being used for research on the use of water-saving irrigation technology, and as a result, up to 40% of irrigation water has been saved. …”
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    Research on deception defense techniques based on network characteristics obfuscation by Jinlong ZHAO, Guomin ZHANG, Changyou XING

    Published 2021-08-01
    “…There is usually a reconnaissance stage before a network attack, the attacker obtains the key information of the target system through techniques such as traffic analysis and active scanning, to formulate a targeted network attack.Deception defense techniques based on network characteristics obfuscation is an effective strategy to confront network reconnaissance, which makes the attacker launch an ineffective attack by thwarting the attacker's reconnaissance stage.The technical principle of the existing obfuscation defense solutions was analyzed, the formal definition of network obfuscation was given, the existing research works were discussed from three aspects, and finally the development trend of the obfuscation deception defense technique were analyzed.…”
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    Research and practice of OTN controller northbound unified interface model by Yanxia TAN, Yanlei ZHENG, Guangquan WANG, He ZHANG

    Published 2022-10-01
    “…In the software defined optical transport network (SDOTN) architecture, the manufacturer’s controller system is required to be connected to the optical transport network (OTN) orchestrator system through the northbound interface.However, there is currently no unified northbound interface standard, which brings many problems to the automatic provisioning of cross-domain and cross-vendor end-to-end services in SDOTN.The status and problems of OTN controller northbound open interface standards were expounded, and the current mainstream transport application programming interface (TAPI) and abstraction and control of traffic engineering network (ACTN) northbound interface standards from the perspective of network models were compared and analyzed.Finally, the research practice of China Unicom in the standardization of ACTN unified interface model and the construction of management and control system were introduced, and an outlook on the follow-up research and development direction was provided.…”
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    Current Research and Development Trend of 5G Network Technologies by Hucheng Wang, Hui Xu, Zhimi Cheng, Ke Wang

    Published 2015-09-01
    “…The challenges for mobile communication network raised by new requirements in 5G were analyzed, and then the necessity of researching 5G network technologies was explained. After that, the research situation of global research organizations was introduced, such as NGMN, 5GPPP, IMT-2020 and so on, regarding 5G network technologies, moreover, the standardization status of global standards development organizations on 5G network technologies were introduced. …”
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