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一种基于机器学习的模型检查算法性能预测方法

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华东师范大学学报（自然科学版） 2024年第4期 18-29页

作者：张枨宇诸嘉逸黄怿豪杨迪李建文缪炜恺阎迪顾斌詹乃军蒲戈光苏黎世联邦理工学院计算机科学学院苏黎世8006 华东师范大学软件工程学院上海200062 南洋理工大学计算机科学与技术学院新加坡211106 中航商用航空发动机有限责任公司上海200241 中国航天科技集团有限公司北京100048 中国科学院软件研究所北京100190

与非图模型是一种表示电路设计的通用基础形式,同时也是模型检查器的一种通用输入格式.介绍了一种基于与非图结构编码的特征提取方法,并基于该方法实现了一种快速的组合模型检查器Liquid.所提出的结构编码的核心思想:首先罗列出与非图... 详细信息

与非图模型是一种表示电路设计的通用基础形式,同时也是模型检查器的一种通用输入格式.介绍了一种基于与非图结构编码的特征提取方法,并基于该方法实现了一种快速的组合模型检查器Liquid.所提出的结构编码的核心思想:首先罗列出与非图中所有可能的子结构,再将每个子结构出现的次数编码成向量,该向量即作为与非图的特征向量参与之后的机器学习过程.由于各种模型检查算法的性能在不同的与非图上参差不齐,Liquid的设计目标是组合多种模型检查算法,针对不同的与非图使用机器学习模型挑选出合适的算法.收集了目前所有的模型检查器基准测试集作为实验数据集并进行了实验.实验结果表明,Liquid在实验数据集上的表现优于所有组合中的独立模型检查算法,并有着不错的预测准确率.同时,还从多个维度分析了Liquid有效的原因.

关键词：模型检查与非图组合模型检查器

Automated coverage-driven testing: combining symbolic execution and model checking

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Science China(Information Sciences) 2016年第9期59卷 242-243页

作者： Ting SU Geguang PU weikai miao Jifeng HE Zhendong SU Shanghai Key Laboratory of Trustworthy Computing East China Normal University Department of Computer Science University of California

Software testing is the primary way to ensure software quality,but occupies more than 50%the cost of software development[1].It was estimated that software failures cost the US economy alone about 60 billion each year... 详细信息

关键词： test combining symbolic execution and model checking Automated coverage-driven testing DSE code

Improved precise positioning with BDS-3 quad-frequency signals

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Satellite Navigation 2020年第1期1卷 328-337页

作者： Bofeng Li Zhiteng Zhang weikai miao Guang’e Chen College of Surveying and GeoInformatics Tongji UniversityShanghai 200092China Department of Geomatics Engineering University of CalgaryCalgary T2N 1N4Canada

The establishment of the BeiDou global navigation satellite system(BDS-3)has been completed,and the current constellation can independently provide positioning service ***-3 satellites provide quad-frequency signals,which can benefit the ambiguity resolution(AR)and high-precision *** paper discusses the benefits of quad-frequency observations,including the precision gain of multi-frequency high-precision positioning and the sophisticated choice of extra-wide-lane(EWL)or wide-lane(WL)combinations for instantaneous EWL/WL ***,the performance of EWL real-time kinematic(ERTK)positioning that only uses EWL/WL combinations is *** results indicate that the horizontal positioning errors of ERTK positioning using ionosphere-free(IF)EWL observations are approximately 0.5 m for the baseline of 27 km and 1 m for the baseline of 300 ***,the positioning errors are reduced to the centimetre level if the IF EWL observations are smoothed by narrow-lane observations for a short period.

关键词： Quad-frequency Precise point positioning Real-time kinematic Extra-wide-lane combinations Ambiguity resolution

Performance Predictable ServiceBSP Model for Grid Computing

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Wuhan University Journal of Natural Sciences 2007年第5期12卷 871-874页

作者： TONG Weiqin miao weikai School of Computer Engineering and Science Shanghai University Shanghai 200072 China

This paper proposes a performance prediction model for grid computing model ServiceBSP to support developing high quality applications in grid environment. In ServiceBSP model, the agents carrying computing tasks are dispatched to the local domain of the selected computation services. By using the IP （integer program） approach, the Service Selection Agent selects the computation services with global optimized QoS （quality of service） consideration. The performance of a ServiceBSP application can be predicted according to the performance prediction model based on the QoS of the selected services. The performance prediction model can help users to analyze their applications and improve them by optimized the factors which affects the performance. The experiment shows that the Service Selection Agent can provide ServiceBSP users with satisfied QoS of applications.

关键词： grid computing QoS agent ServiceBSP performance prediction

Foundation models meet visualizations: Challenges andopportunities

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Computational Visual Media 2024年第3期10卷 399-424页

作者： weikai Yang Mengchen Liu Zheng Wang Shixia Liu School of Software Tsinghua UniversityBeijing 100084China Microsoft Redmond 98052USA

Recent studies have indicated that foundation models, such as BERT and GPT, excel atadapting to various downstream tasks. This adaptability has made them a dominant force in buildingartiﬁcial intelligence (AI) systems. Moreover, a newresearch paradigm has emerged as visualizationtechniques are incorporated into these models. Thisstudy divides these intersections into two researchareas: visualization for foundation model (VIS4FM)and foundation model for visualization (FM4VIS).In terms of VIS4FM, we explore the primary roleof visualizations in understanding, reﬁning, and evaluating these intricate foundation models. VIS4FMaddresses the pressing need for transparency, explainability, fairness, and robustness. Conversely, in termsof FM4VIS, we highlight how foundation models canbe used to advance the visualization ﬁeld itself. Theintersection of foundation models with visualizations ispromising but also introduces a set of challenges. Byhighlighting these challenges and promising opportunities, this study aims to provide a starting point forthe continued exploration of this research avenue.

关键词： visualization artiﬁcial intelligence(AI) machine learning foundation models visualization for foundation model(VIS4FM) foundation model for visualization(FM4VIS)

Interdecadal change and projection of the relationship between spring Arctic Oscillation and summer precipitation in the Yangtze River valley in CMIP6 models

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Atmospheric and Oceanic Science Letters 2024年第4期17卷 15-22页

作者： weikai Jia Botao Zhou Ziyi Song Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment ChangeNanjing University of Information Science and TechnologyNanjingChina

评估了20个CMIP6模式对春季北极涛动(AO)与长江流域夏季降水(YRP)关系的模拟能力.结果表明, 4个模式(ACCESS-ESM1-5, CMC-CM2-SR5, MRI-ESM2-0, NorESM2-LM))能合理模拟出1990年代后期AO-YRP关系的减弱. 1980-1998年,当春季AO位于正位相时,夏季东亚急流北移,长江流域为异常下沉运动,同时西太平洋副热带高压减弱,减少向长江流域的水汽输送,结果导致降水减少. 1999-2014年,上述大气环流与春季AO的联系不显著,从而减弱AO-YRP的关系.利用这四个模式进一步预估了RCP4.5情景下2015-2100年期间AO-YRP的关系.两者在2015-2040年为显著负相关关系,随后再次减弱.

关键词：北极涛动降水长江流域年代际变化 CMIP6

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多频多模GNSS高精度定位关键技术与挑战

武汉大学学报(信息科学版) 2023年第11期48卷 1769-1783页

作者：李博峰苗维凯陈广鄂同济大学测绘与地理信息学院上海200092

高精度全球导航卫星系统(global navigation satellite system,GNSS)定位技术拓展了位置服务行业的纵深发展,在智慧城市、智能交通和无人驾驶等领域得到了广泛应用,是当前卫星导航领域的热点。梳理了GNSS定位技术的现状和发展脉络,阐述... 详细信息

高精度全球导航卫星系统(global navigation satellite system,GNSS)定位技术拓展了位置服务行业的纵深发展,在智慧城市、智能交通和无人驾驶等领域得到了广泛应用,是当前卫星导航领域的热点。梳理了GNSS定位技术的现状和发展脉络,阐述多频多模GNSS高精度定位所涉及的整数模糊度固定、函数模型和随机模型融合等共性基础理论,介绍提升GNSS定位性能的非模型误差处理以及周跳探测与数据中断修复等关键技术。依托基础理论和关键技术的创新成果,介绍了同济大学GNSS团队近年来发展的4种多频多模GNSS高精度定位应用新技术,并展望了未来以GNSS为核心的高精度定位技术的发展趋势及其挑战。

关键词：整数模糊度高精度定位长距离RTK 数据融合海洋定位

NP-MBO:A newton predictor-based momentum observer for interaction force estimation of legged robots

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Biomimetic Intelligence & Robotics 2024年第2期4卷 78-85页

作者： Zhengguo Zhu weikai Ding Weiliang Zhu Daoling Qin Teng Chen Xuewen Rong Guoteng Zhang School of Control Science and Engineering Shandong UniversityJinan 250061China

Swift perception of interaction forces is a crucial skill required for legged robots to ensure safe human-robot interaction and dynamic contact ***-based interactive force is widely applied due to its outstanding cross-platform *** this paper,we present a novel interactive force observer,which possesses superior dynamic tracking *** propose a dynamic cutoff frequency configuration method to replace the conventional fixed cutoff frequency setting in the traditional momentum-based observer(MBO).This method achieves a balance between rapid tracking and noise ***,to mitigate the phase lag introduced by the low-pass filtering,we cascaded a Newton Predictor(NP)after MBO,which features simple computation and *** precision analysis of this method has been *** conducted extensive experiments on the point-foot biped robot BRAVER to validate the performance of the proposed algorithm in both simulation and physical prototype.

关键词： Interaction force estimation Momentum-based observer Newton predictor Force control

Stochastic modeling of BeiDou double-difference observation and impact analysis

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Stochastic modeling of BeiDou double-difference observation ...