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Towards Reliable Configuration Management in Clouds: A Lightweight Consistency Validation Mechanism for Virtual Private Clouds

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Chinese Journal of Electronics 2025年第1期34卷 49-63页

作者： Yuhang Qiu Gongming Zhao Hongli Xu Long Li He Huang Liusheng Huang School of Computer Science and Technology University of Science and Technology of China Suzhou Institute for Advanced Research University of Science and Technology of China School of Computer Science and Technology Soochow University

The virtual private cloud service currently lacks a real-time end-to-end consistency validation mechanism, which prevents tenants from receiving immediate feedback on their requests. Existing solutions consume excessive communication and computational resources in such large-scale cloud environments, and suffer from poor timeliness. To address these issues, we propose a lightweight consistency validation mechanism that includes real-time incremental validation and periodic full-scale validation. The former leverages message layer aggregation to enable tenants to swiftly determine the success of their requests on hosts with minimal communication overhead. The latter utilizes lightweight validation checksums to compare the expected and actual states of hosts locally, while efficiently managing the checksums of various host entries using inverted indexing. This approach enables us to efficiently validate the complete local configurations within the limited memory of hosts. In summary, our proposed mechanism achieves closed-loop implementation for new requests and ensures their long-term effectiveness.

关键词： Cloud computing Memory management Configuration management Reliability engineering Real-time systems Indexing

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A Systematic Thermodynamic Analysis of the Thermally Regenerative Electrochemical Cycle

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Journal of Thermal science 2025年第2期34卷 389-399页

作者： FU Shen TANG Xin LIU Penghui LI Guiqiang Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei230026China

Thermally regenerative electrochemical cycle(TREC)is a novel and effective heat-to-electricity technology for harvesting low-grade ***,reported TREC analyses have been based on the Stirling cycle of ideal infinite heat source and infinite time for heat ***,this will lead to inaccuracy when the scenario deviates from the ideal *** this study,a systematic thermodynamic analysis on TREC is performed to address this *** on different heat transfer situations,the description of thermodynamic processes and the corresponding mathematical models are *** the same time,the TREC system,with the solar collector as the high-temperature heat source and the environment as the low-temperature heat source,is employed as a *** the study delved into discrepancies arising from incongruences between the practical operational process and the traditional ideal analytical methodologies,along with an investigation of the different thermal environment impact on system *** findings suggest that the finite analysis method should be used when the actual operating time of the system is shorter than the desired equilibrium *** the contrary,the use of the infinite analysis method,in this case,produces an error,the magnitude of which is directly related to the operating time,whereas when the time reaches 80%of the equilibrium time the error can be controlled to less than 2%.The influence of the heat source on the operating phase of the system is mainly in the temperature equilibrium and the rate of temperature *** effect is proportional to the thermal capacitance and is also positively related to the system ***,to improve system performance,it is recommended that a high-temperature heat source with a high ratio of thermal capacitance to system thermal capacitance should be selected and that the response time should slightly exceed the system equilibrium duration.

关键词： waste heat recovery thermodynamic analysis other power cycles and advanced cycles

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First satellite observation of total column water vapor from the Chinese Environmental Trace Gases Monitoring Instrument

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science china Earth sciences 2025年第4期68卷 977-997页

作者： Ran ZHAO Chengxin ZHANG Wenjing SU Jin YE Ziwei LI Cheng LIU School of Environmental Science and Optoelectronic Technology University of Science and Technology of ChinaHefei230026China Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei230026China Department of Environmental Science and Engineering University of Science and Technology of ChinaHefei230026China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei230031China Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes University of Science and Technology of ChinaHefei230026China

Atmospheric water vapor is a critical component of the Earth's water cycle and has significant impacts on weather,climate,and atmospheric ***,deficiencies remain in the coverage and accuracy of water vapor *** this study,we first retrieved the total column water vapor(TCWV)in the visible blue spectral band from two Chinese satellite UV-Vis spectrometers,the Environmental Trace Gases Monitoring Instruments(EMIs),which are onboard the Chinese GaoFen-5(GF-5,since May 2018)and GaoFen-5B(GF-5B,since September 2021)***,limited by factors such as the relatively lower spectral signal-to-noise ratio and weak absorption of water vapor,the accurate retrieval of TCWV from the EMI spectrum is rather ***,we improved the baseline TCWV retrieval based on the differential optical absorption technique,including the re-calibration of the on-orbit spectra,optimization of the spectral fitting,and bias correction in the fitted *** tests show that the mean retrieval TCWV error of the EMI decreased by 1.47 kg m-2compared to that using uncalibrated *** improved spectral fitting significantly reduced the relative uncertainty of the water vapor slant column densities(SCD)by 13.42%,and increased the number of successful fits by 11.64%.The improved EMI TCWV retrieval results from both the GF-5 and GF-5B satellites show a trend consistent with the TROPOspheric Monitoring Instrument(TROPOMI)satellite observations,with a correlation coefficient(R)of 0.98 and a mean bias of 1.04 kg m-2(6.88%).Ground-based validations showed that the correlation between the EMI TCWV retrievals from the GF-5B satellite(R=0.91)and sun photometer measurements was significantly higher than that from the GF-5 satellite(R=0.87),which may have been due to the improved performance of the EMI instrument on the GF-5B ***,we showed that an intense atmospheric river event could be successfully captured by EMI TCWV measurements,whi

关键词： Water vapor UV-Vis sensor Trace gas Remote sensing Atmospheric composition

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Room-temperature ferrimagnetism and size-modulated electronic structures in two-dimensional cluster-based metal-organic frameworks

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science china Chemistry 2024年第4期67卷 1334-1340页

作者： Jing Cheng Xingxing Li Jinlong Yang Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of ChinaHefei 230026China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Cluster-assembled materials have attracted particular attention for their complex hierarchical structures and unique ***,the majority of cluster-based assemblies developed so far are either non-magnetic or only exhibit magnetic ordering with a relatively low Curie temperature,limiting their applications in ***,two-dimensional(2D)cluster-assembled materials with room-temperature magnetism remain highly *** this purpose,based on first principles calculations,we design a series of thermodynamically stable 2D cluster-based metal-organic frameworks(MOFs)Fe_(n)-(pyz)(n=1-6)by utilizing Fenmetal clusters as nodes and nitrogen-containing pyrazine ligands as organic *** 2D cluster-based MOFs exhibit robust ferrimagnetic ordering due to the strong d-p direct exchange interaction between d-electron spin of Fe_(n)(n=1-6)clusters and charge transfer-induced p-electron spin of pyrazine *** particular,the ferrimagnetic Curie temperatures are well above room temperature(up to 836 K).Additionally,altering the size of Fe_(n)clusters in Fe_(n)-(pyz)(n=1-6)MOFs results in diverse functional spintronic properties,including bipolar magnetic semiconductors,half semiconductors and Dirac half ***,these 2D assembled MOFs possess sizable magnetic anisotropy energies,up to 9.16 me V per formula.

关键词： metal-organic framework two-dimensional material half metal bipolar magnetic semiconductor magnet

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Leveraging Concise Concepts With Probabilistic Modeling for Interpretable Visual Recognition

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IEEE Transactions on Multimedia 2025年 27卷 3117-3131页

作者： Zhang, Yixuan Liu, Chuanbin Liu, Yizhi Gao, Yifan Lu, Zhiying Xie, Hongtao Zhang, Yongdong University of Science and Technology of China School of Information Science and Technology Hefei230027 China Hunan University of Science and Technology Department of Computer Science and Engineering Hunan411199 China

Interpretable visual recognition is essential for decision-making in high-stakes situations. Recent advancements have automated the construction of interpretable models by leveraging Visual Language Models (VLMs) and Large Language Models (LLMs) with Concept Bottleneck Models (CBMs), which process a bottleneck layer associated with human-understandable concepts. However, existing methods suffer from two main problems: a) the collected concepts from LLMs could be redundant with task-irrelevant descriptions, resulting in an inferior concept space with potential mismatch. b) VLMs directly map the global deterministic image embeddings with fine-grained concepts results in an ambiguous process with imprecise mapping results. To address the above two issues, we propose a novel solution for CBMs with Concise Concept and Probabilistic Modeling (CCPM) that can achieve superior classification performance via high-quality concepts and precise mapping strategy. First, we leverage in-context examples as category-related clues to guide LLM concept generation process. To mitigate redundancy in the concept space, we propose a Relation-Aware Selection (RAS) module to obtain a concise concept set that is discriminative and relevant based on image-concept and inter-concept relationships. Second, for precise mapping, we employ a Probabilistic Distribution Adapter (PDA) that estimates the inherent ambiguity of the image embeddings of pre-trained VLMs to capture the complex relationships with concepts. Extensive experiments indicate that our model achieves state-of-the-art results with a 6.18% improvement in classification accuracy on eight mainstream recognition benchmarks as well as reliable explainability through interpretable analysis. © 1999-2012 IEEE.

关键词： Decision making

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Fermiology with nodal structures in nonsymmorphic superconductor LaNiGa_(2):A de Haas-van Alphen study

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science china(Physics,Mechanics & Astronomy) 2025年第4期68卷 189-197页

作者： Houpu Li Ye Yang Mengzhu Shi Yingcai Qian Senyang Pan Kaibao Fan Nan Zhang Kaixin Tang Hongyu Li Zhiwei Wang Jinglei Zhang Chuanying Xi Ziji Xiang Xianhui Chen Department of Physics University of Science and Technology of ChinaHefei 230026China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China School of Physics Hefei University of TechnologyHefei 230009China High Magnetic Field Laboratory Chinese Academy of SciencesHefei 230031China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Topological metals possess various types of symmetry-protected degenerate band *** a topological metal becomes superconducting,the low-energy electronic excitations stemming from the band crossings located close to the Fermi level may contribute to highly unusual pairing symmetry and superconducting *** this work,we study the electronic band structure of the time-reversal symmetry breaking superconductor LaNiGa_(2)by means of quantum oscillation measurements.A comprehensive investigation combining angle-resolved high-field de Haas-van Alphen(dHvA)spectroscopy and first-principles calculations reveals the fermiology of LaNiGa_(2)and verifies its nonsymmorphic Cmcm lattice symmetry,which promises nodal band crossings pinned at the Fermi level with fourfold ***,such nodal structures,proposed to play a crucial role giving rise to the interorbital triplet pairing,are indeed captured by our d Hv A *** results identify LaNiGa_(2)as a prototypical topological crystalline superconductor and highlight the putative contribution of low-energy nodal quasiparticles to unconventional superconducting pairing.

关键词： LaNiGa_(2) quantum oscillation fermiology nodal structures

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EAROE:Enabling Body-Channel Voice Interaction Interface on Earphones via Occlusion Effect

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IEEE Internet of Things Journal 2025年第12期12卷 18651-18664页

作者： Han, Feiyu Zuo, You Jiang, Weiwei Yan, Dawei Zhao, Yuxin Yang, Panlong Yan, Yubo School of Computer Science Nanjing University of Information Science and Technology Nanjing210044 China School of Computer Science and Technology University of Science and Technology of China Hefei230021 China

Nowadays, voice input on earphones has become one of the most paramount human-computer interaction approaches. Traditional voice interaction is built on the air channel, which is highly noise-susceptible and suffers from being falsely triggered by nearby competing users. In our work, we design a noise-resistant voice interaction interface on earphones, named EAROE, which takes advantage of the narrow-bandwidth body channel to reconstruct high-fidelity audible speech. Although promising, directly taking the body channel as a voice interaction interface is non-trivial since the limited bandwidth of body-channel speech causes the original timbre information and linguistic content to be lost. To address these issues, we employ an electro-acoustic (EA) model for occlusion effect-based cross-channel correlation analysis. Based on that, we carefully design an attention-based encoder-decoder network to embrace cross-channel correlation for high-quality wide-bandwidth spectrum synthesis. To accommodate individual differences and improve model generalization, we implement a physics-based data augmentation strategy to expand the scale of the training dataset. Through extensive real-world experiments with 28 participants, EAROE can achieve an average Mel-cepstral distance of 8.08, an average modulation spectra distance of 0.82, and an average log-spectral distance of 11.16, outperforming existing solutions. © 2014 IEEE.

关键词： Bandwidth

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Pushing the Limits of WiFi-Based Gait Recognition Towards Non-Gait Human Behaviors

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IEEE Transactions on Mobile Computing 2025年第7期24卷 6137-6153页

作者： Yan, Dawei Yang, Panlong Shang, Fei Han, Feiyu Yan, Yubo Li, Xiang-Yang University of Science and Technology of China School of Computer Science and Technology Hefei230021 China Nanjing University of Information Science & Technology School of Computer Science Nanjing210044 China

WiFi-based gait recognition technologies have seen significant advancements in recent years. However, most existing approaches rely on a critical assumption: users must walk continuously and maintain a consistent body posture. This poses a substantial challenge when users engage in non-periodic or discontinuous behaviors (e.g., stopping, starting, or turning mid-walk), which can disrupt the extraction of gait-related features and degrade recognition performance. To address this issue, we propose freeGait, a novel approach designed to mitigate the impact of non-gait behaviors in WiFi-based gait recognition systems. Our solution models this problem as domain adaptation, where we learn domain-independent representations to isolate gait features from behavior-dependent noise. We treat human behaviors with labeled user data as source domains and behaviors without user labels as target domains. However, applying domain adaptation directly is challenging due to the ambiguous classification boundaries in the target domains for WiFi signals. To overcome this, we align the posterior distributions between the source and target domains and constrain the conditional distribution within the target domains to enhance gait classification accuracy. Additionally, we implement a data augmentation module to generate data resembling the labeled data, while supervised learning ensures distinctiveness between users. Our experiments, conducted with 20 participants across 3 different scenarios, demonstrate that freeGait can accurately predict data across 15 domains by labeling only a small subset from 6 source domains, achieving up to a 45% improvement in user classification accuracy compared to existing methods. © 2002-2012 IEEE.

关键词： Wi-Fi

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Effects of doors on an open cavity flow at Mach number 6

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Chinese Journal of Aeronautics 2025年第2期38卷 75-91页

作者： Baoping NIE Xilin HU Zhufei LI Department of Modern Mechanics University of Science and Technology of ChinaHefei 230027China

Open cavities with different door-opening angles are investigated using high-speed schlieren visualization and dynamic pressure measurements in hypersonic flow with a freestream Mach number of *** the help of numerical simulations,the shear layer deformation and pressure increase in the cavities due to the impingement of the door-leading-edge shocks are identified via comparison with those in the cavity without *** the door-opening angle decreases from 90°,the shear layer above the forepart of the cavity is gradually raised by the high pressure in the *** the door-opening angle decreases to 30°and 15°,the boundary layer on the upstream flat plate of the cavity separates,and separation shock is *** doors enhance the instability of the cavity flow and increase the pressure fluctuations in the cavities.A new oscillation pattern,referred to as coupled oscillation,is observed in the cases with separation on the upstream flat plate,in which the separation shock oscillates at the same dominant frequency as the flow inside the *** with the cavity without doors,this coupled oscillation causes a lower oscillation frequency and a larger overall sound pressure ***-correlation analyses between pressure signals indicate that the disturbances generated at the trailing edge of the cavity can propagate to the separation on the upstream flat plate and cause coupled oscillation of the separation *** fundamental frequencies of the coupled oscillations can be normalized to approximately the same Strouhal number as that of the cavity without *** findings support that the oscillation mechanisms of hypersonic cavities without and with doors are primarily dominated by acoustic feedback.

关键词： Hypersonic flow Cavity oscillation Doors Shear-layer deformation Pressure fluctuation Acoustic feedback

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Labeling-based centrality approaches for identifying critical edges on temporal graphs

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Frontiers of computer science 2025年第2期19卷 89-104页

作者： Tianming ZHANG Jie ZHAO Cibo YU Lu CHEN Yunjun GAO Bin CAO Jing FAN Ge YU School of Computer Science and Technology Zhejiang University of TechnologyHangzhou 310023China School of Computer Science and Technology Zhejiang UniversityHangzhou 310013China Department of Computer Science Northeastern UniversityShenyang 110819China

Edge closeness and betweenness centralities are widely used path-based metrics for characterizing the importance of edges in *** general graphs,edge closeness centrality indicates the importance of edges by the shortest distances from the edge to all the other *** betweenness centrality ranks which edges are significant based on the fraction of all-pairs shortest paths that pass through the ***,extensive research efforts go into centrality computation over general graphs that omit time ***,numerous real-world networks are modeled as temporal graphs,where the nodes are related to each other at different time *** temporal property is important and should not be neglected because it guides the flow of information in the *** state of affairs motivates the paper’s study of edge centrality computation methods on temporal *** introduce the concepts of the label,and label dominance relation,and then propose multi-thread parallel labeling-based methods on OpenMP to efficiently compute edge closeness and betweenness centralities *** types of optimal temporal *** edge closeness centrality computation,a time segmentation strategy and two observations are presented to aggregate some related temporal edges for uniform *** edge betweenness centrality computation,to improve efficiency,temporal edge dependency formulas,a labeling-based forward-backward scanning strategy,and a compression-based optimization method are further proposed to iteratively accumulate centrality *** experiments using 13 real temporal graphs are conducted to provide detailed insights into the efficiency and effectiveness of the proposed *** with state-ofthe-art methods,labeling-based methods are capable of up to two orders of magnitude speedup.

关键词： temporal graph closeness centrality between-ness centrality temporal path

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