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An analysis method for ISL of multilayer constellation

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Journal of Systems Engineering and Electronics 2022年第4期33卷 961-968页

作者： XU Xiaoyi wang chunhui JIN Zhonghe Micro-Satellite Research Center Zhejiang UniversityHangzhou 310027China

The multilayer satellite network has high spatial spectrum utilization, flexible networking, strong survivability, and diversified functions. The inter-satellite links(ISLs) and crosslayer ISLs(CLISLs) enable direct communication paths between satellites, which improves the spatial autonomy of the constellation. Due to the existence of perturbation, ISLs are affected for a long time, which impacts reliable inter-satellite transmission. The stability and complexity of ISL establishment are related to the static and dynamic characteristics of range and azimuth. This paper presents a model of ISLs in a perturbed multilayer constellation. Series of theoretical derivation, simulation, and numerical calculation are carried out. A more comprehensive multilayer constellation ISL model is obtained. The work of this paper provides some theoretical foundations for constellation networking research.

关键词： satellite network multilayer constellation inter-satellite link(ISL)

Experimental study on behavior of mortar-aggregate interface after elevated temperatures

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Frontiers of Structural and Civil Engineering 2017年第2期11卷 158-168页

作者： Wan wang Jianzhuang XIAO Shiying XU chunhui wang Department of Structural Engineering Tongji University Shanghai 200092 China

A push-out test program was designed and conducted to study the meso-scale behavior of mortaraggregate interface for concrete after elevated temperatures ranging from 20℃ to 600℃ with the concept of modeled concrete （MC） and modeled recycled aggregate concrete （MRAC）. The MCs and MRACs were designed with different strength grade of mortar and were exposed to different elevated temperatures. Following that the specimens were cooled to room temperature and push-out tests were conducted. Failure process and mechanical behaviors were analyzed based on failure modes, residual load-displacement curves, residual peak loads and peak displacements. It is found that failure modes significantly depended on specimen type, the elevated temperature and the strength grade of mortar. For MC, major cracks started to propagate along the initial cracks caused by elevated temperatures at about 80% of residual peak load. For MRAC, the cracks appeared at a lower level of load with the increasing elevated temperatures. The cracks connected with each other, formed a failure face and the specimens were split into several parts suddenly when reaching the residual peak load. Residual load-displacement curves of different specimens had similarities in shape. Besides, effect of temperatures and strength grade of mortar on residual peak load and peak displacement were analyzed. For MC and MRAC with higher strength of new hardened mortar, the residual peak load kept constant when the temperature is lower than 400℃ and dropped by 43.5% on average at 600℃. For MRAC with lower strength of new hardened mortar, the residual peak load began to reduce when the temperatures exceeded 200℃ and reduced by 27.4% and 60.8% respectively at 400℃ and 600℃. The properties of recycled aggregate concrete （RAC） may be more sensitive to elevated temperatures than those of natural aggregate concrete （NAC） due to the fact that the interracial properties of RAC are lower than those of NAC, and are deteriorated at lower

关键词： mortar-aggregate interface push-out test elevated temperatures modeled concrete (MC) modeled recycled aggregate concrete (MRAC)

Atomistic Insights into the Irradiation Resistance of Co-Free High Entropy Alloy FeMnNiCr

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Acta Metallurgica Sinica(English Letters) 2024年第10期37卷 1657-1666页

作者： chunhui wang Lei Guo Rui Li Qing Peng School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Guangdong Aerospace Research Academy Guangzhou511458China

We have investigated the displacement cascade irradiation resistance behavior of a cobalt-free high entropy alloy FeMnNiCr using molecular dynamics *** results show that defects in FeMnNiCr form in small clusters,and their migration is significantly inhibited,leading to a higher defect recombination rate and a lower number of residual defects compared to ***,FeMnNiCr exhibits a longer thermal peak life and lower thermal conductivity compared to Ni,providing a longer time for defect migration and *** migration of defect clusters in FeMnNiCr displays three-dimensional properties,attributed to its high chemical *** prolonged irradiation,defects in FeMnNiCr stabilize as small clusters,whereas point defects in Ni tend to form large defect clusters and evolve into *** the feature of absence of the element cobalt,our results imply that FeMnNiCr has great potential in application in nuclear energies.

关键词： High entropy alloys Displacement cascade Irradiation defects Molecular dynamics

Nanotechnologies for enhancing cancer immunotherapy

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Nano Research 2020年第10期13卷 2595-2616页

作者： Jingxian Yang chunhui wang Shuo Shi Chunyan Dong Breast cancer center Shanghai East HospitalSchool of MedicineShanghai Key Laboratory of Chemical Assessment and SustainabilitySchool of Chemical Science and EngineeringTongji UniversityShanghai 200120China

Immunotherapy,a burgeoning field differs from traditional cancer treatments,is revolutionizing oncologic *** aims to stimulate the innate and adaptive immune system of a patient to fight against tumor ***,low response rate and immune-related adverse effects(irAEs)remain problems during its management.A novel technology using nanomaterials may bring a *** nanoparticles have been investigated as delivery systems to augment cancer therapeutic efficacy in the lab and *** this review,we briefly summarize the connotation of immunotherapy,the application of nanotechnology in cancer,especially focusing on the synergistic effect of nanoplatform-based technology combined with cancer immunotherapy,hoping to make readers a deep insight into this interdisciplinary field.

关键词： cancer im munotherapy nanoplatform-based technology combination therapy synergistic effect

Tetrandrine and arsenic trioxide synergistically inhibit proliferation of HCC1937 triple negative breast cancer cells

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Journal of Traditional Chinese Medicine 2017年第4期37卷 436-443页

作者： Liang Chen wang chunhui Pei Xiaohua Beijing University of Chinese Medicine Beijing 100029 China Beijing University of Chinese Medicine Third Affiliated Hospital Beijing 100029 China

OBJECTIVE: To evaluate the effects of tetrandrine plus arsenic trioxide on HCC1937 cells, a triple negative breast cancer cell line, and to explore possible ***: The 3-(4,5-Dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide method was used to compare the antiproliferative effects of tetrandrine,arsenic trioxide alone and tetrandrine plus arsenic trioxide on HCC1937 cells. The median-effect principle(Chou-Talalay combination index method) was used to examine the interaction between the two drugs. Flow cytometry was used to evaluate effects of treatment with tetrandrine, arsenic trioxide or the combination of both on HCC1937 cell apoptosis. Real-time polymerase chain reaction and western blotting were performed to evaluate changes in apoptosis-related gene expression and protein ***: Tetrandrine and arsenic trioxide each in-hibited HCC1937 cell proliferation in a dose-dependent manner. The cell inhibition rate of HCC1937 cells treated with a combination of tetrandrine and arsenic trioxide was significantly higher than with either compound alone. The two drugs produced a synergistic effect when the inhibition rate was20%-40%. Flow cytometry results showed that treatment with the two drugs increased the proportion of apoptotic cells. In the combination treated group, caspase-3 activation and PARP cleavage were significantly higher than in the other ***, Bcl-2 and survivin expression were decreased, whereas that of both Bid and Bax was ***: These findings demonstrated that tetrandrine plus arsenic trioxide had synergistic efficacy on induction of apoptosis in HCC1937 cells.

关键词： Triple negative breast neoplasms Tetrandrine Arsenicum sublimatum HCC1937 Synergistic effect

Approach to inter-satellite time synchronization for micro-satellite cluster

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Journal of Systems Engineering and Electronics 2018年第4期29卷 805-815页

作者： XU Jiuling ZHANG Chaojie wang chunhui JIN Xiaojun Micro-Satellite Research Center Zhejiang University

Micro-satellite cluster enables a whole new class of missions for communications, remote sensing, and scientific research for both civilian and military purposes. Synchronizing the time of the satellites in a cluster is important for both cluster sensing capabilities and its autonomous operating. However, the existing time synchronization methods are not suitable for microsatellite cluster, because it requires too many human interventions and occupies too much ground control resource. Although, data post-process may realize the equivalent time synchronization, it requires processing time and powerful computing ability on the ground, which cannot be implemented by cluster itself. In order to autonomously establish and maintain the time benchmark in a cluster, we propose a compact time difference compensation system（TDCS）, which is a kind of time control loop that dynamically adjusts the satellite reference frequency according to the time difference. Consequently, the time synchronization in the cluster can be autonomously achieved on-orbit by synchronizing the clock of other satellites to a chosen one＇s. The experimental result shows that the standard deviation of time synchronization is about 102 ps when the carrier to noise ratio（CNR） is 95 d BHz, and the standard deviation of corresponding frequency difference is approximately0.36 Hz.

关键词： time difference measurement time synchronization dynamical reference frequency adjustment micro-satellite cluster

An optimal coupling incentive mechanism concerning insider’s compliance behavior towards marine information security policy

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Journal of Ocean Engineering and Science 2023年第5期8卷 573-575页

作者： Xiaolong wang Changlin wang Zaiguan Sun chunhui wang School of Economics and Management Binzhou UniversityBinzhou 256600China

It is widely agreed that the insider’s noncompliance to the marine information security policies has brought about a major security problem in the organizational *** research has stressed the potential of remunerative control,i.e.,reward,to better understand this *** studies have been devoted to the exploration of the coupling incentive mechanism of tangible and intangible rewards that would induce insider’s compliance behavior towards the marine information security *** the present study,we address this research gap by proposing a theoretical model that explains the optimal coupling incentive mechanism of these two different types of remunerative *** findings have delivered insightful implications for practice and research on how to improve the marine information security policy compliance in a more subtle way.

关键词： Marine information Information security policy Compliance behavior Incentive mechanism

Inversion Study on Pollutant Discharges in the Bohai Sea with the Adjoint Method

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Journal of Ocean University of China 2015年第6期14卷 941-950页

作者： SHEN Youli wang chunhui wang Yonggang LV Xianqing Physical Oceanography Laboratory Ocean University of China Beihai Marine Environmental Monitoring Center Station of SOA Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology North China Sea Branch of State Oceanic Administration The First Institute of Oceanography SOA

The adjoint method is presented which could be used to estimate the time-varying contamination concentration(CC) from pollution source(PS). Then the pollutant flux is calculated. In order to guarantee the continuity of pollutant distribution and make the calculated results more accurate, the independent point(IP) scheme is proposed. The contamination concentrations(CCs) at some time steps are selected as the independent points(IPs), and only CCs at these IPs are optimized while CCs at other points are calculated through linear interpolation of the independent CCs. In twin numerical experiments, all the given distributions are successfully inverted with the adjoint method. The cost functions and the mean absolute errors(MAEs) in concentrations and pollutant fluxes decrease greatly after assimilation, and the cost functions are reduced by about 5 orders of magnitude compared with their initial values. The results indicate that the adjoint method is computationally efficient to recover CCs from PS. It is easier to invert the given distribution which is less complex. The inversion efficiency with IP scheme is raised compared to that without this scheme. The IP scheme is significant for the inversion result, in which appropriate IP number could yield better inversion results. More work will be done to apply this method to real experiment.

关键词： adjoint method time-varying variable contamination concentration pollutant flux independent point scheme

User story clustering in agile development:a framework and an empirical study

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Frontiers of Computer Science 2023年第6期17卷 43-59页

作者： Bo YANG Xiuyin MA chunhui wang Haoran GUO Huai LIU Zhi JIN School of Information Science and Technology Beijing Forestry UniversityBeijing 100083China Engineering Research Center for Forestry Oriented Intelligent Information Processing National Forestry and Grassland AdministrationBeijing 100083China School of Information Science and Technology North China University of TechnologyBeijing 100144China College of Computer Science and Technology Inner Mongolia Normal UniversityHohhot 010020China Department of Computer Science and Software Engineering Swinburne University of TechnologyHawthorn VIC 3122Australia Key Laboratory of High Confidence Software Technologies(Peking University) Ministry of EducationBeijing 100871China Institute of Software School of Computer SciencePeking UniversityBeijing 100871China

Agile development aims at rapidly developing software while embracing the continuous evolution of user requirements along the whole development *** stories are the primary means of requirements collection and elicitation in the agile development.A project can involve a large amount of user stories,which should be clustered into different groups based on their functionality’s similarity for systematic requirements analysis,effective mapping to developed features,and efficient ***,the current user story clustering is mainly conducted in a manual manner,which is time-consuming and subjective to human *** this paper,we propose a novel approach for clustering the user stories automatically on the basis of natural language ***,the sentence patterns of each component in a user story are first analysed and determined such that the critical structure in the representative tasks can be automatically extracted based on the user story *** similarity of user stories is calculated,which can be used to generate the connected graph as the basis of automatic user story *** evaluate the approach based on thirteen datasets,compared against ten baseline *** results show that our clustering approach has higher accuracy,recall rate and F1-score than these *** is demonstrated that the proposed approach can significantly improve the efficacy of user story clustering and thus enhance the overall performance of agile *** study also highlights promising research directions for more accurate requirements elicitation.

关键词： user story agile development user story mapping clustering