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Learning a graph-based classifier for fault localization

Science China(Information Sciences) 2020年第6期63卷 195-216页

作者： hao zhong Hong MEI Department of Computer Science and Engineering Shanghai Jiao Tong University

Because software emerged, locating software faults has been intensively researched, culminating in various approaches and tools that have been applied in real development. Despite the success of these developments, improved tools are still demanded by programmers. Meanwhile, some programmers are reluctant to use any tools when locating faults in their development. The state-of-the-art situation can be naturally improved by learning how programmers locate faults. The rapid development of open-source software has accumulated many bug fixes. A bug fix is a specific type of comments containing a set of buggy files and their corresponding fixed files, which reveal how programmers repair bugs. Feasibly, an automatic model can learn fault locations from bug fixes, but prior attempts to achieve this vision have been prevented by various technical challenges. For example, most bug fixes are not compilable after checking out, which hinders analyzing bug fixes by most advanced static/dynamic tools. This paper proposes an approach called ClaFa that trains a graph-based fault classifier from bug fixes. ClaFa is built on a recent partial-code tool called Grapa, which enables the analysis of partial programs by the complete code tool called WALA. Once Grapa has built a program dependency graph from a bug fix, ClaFa compares the graph from the buggy code with the graph from the fixed code, locates the buggy nodes, and extracts the various graph features of the buggy and clean nodes. Based on the extraction result, ClaFa trains a classifier that combines Adaboost and decision tree learning. The trained ClaFa can predict whether a node of a program dependency graph is buggy or *** evaluate ClaFa on thousands of buggy files collected from four open-source projects: Aries, Mahout,Derby, and Cassandra. The f-scores of ClaFa achieves are approximately 80% on all projects.

关键词： fault classifier partial code analysis bug fix analysis

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Rate Function of Large Deviation for a Class of Nonhomogeneous Markov Chains on Supercritical Percolation Network

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Acta Mathematica Sinica,English Series 2011年第9期27卷 1813-1830页

作者： zhong hao XU Dong HAN School of Finance and Statistics East China Normal University Shanghai 200241 P. R. China Department of Mathematics Shanghai Jiao Tong University Shanghai 200240 P. R. China

We model an epidemic with a class of nonhomogeneous Markov chains on the supercritical percolation network on Zd. The large deviations law for the Markov chain is given. Explicit expression of the rate function for la... 详细信息

关键词： Nonhomogeneous Markov chain large deviation rate function percolation network

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Magnetometer-only linear attitude estimation for bias momentum pico-satellite

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第6期11卷 455-464页

作者： Ke HAN hao WANG zhong-he JIN Department of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China

Satellite attitude information is essential for pico-satellite applications requiring light-weight,low-power,and fast-computation *** objective of this study is to provide a magnetometer-only attitude estimation method for a low-altitude Earth orbit,bias momentum *** on two assumptions,the spacecraft spherical symmetry and damping of body rates,a linear kinematics model of a bias momentum satellite's pitch axis is derived,and the linear estimation algorithm is *** algorithm combines the linear Kalman filter(KF) with the classic three-axis attitude determination method(TRIAD).KF is used to estimate satellite's pitch axis orientation,while TRIAD is used to obtain information concerning the satellite's three-axis *** tests confirmed that the algorithm is suited to the time-varying model errors resulting from both *** estimate result keeps tracking satellite attitude motion during all damping,stable,and free rotating control *** with nonlinear algorithms,such as extended Kalman filer(EKF) and square root unscented Kalman filer(SRUKF),the algorithm presented here has an almost equal performance in terms of convergence time and estimation accuracy,while the consumption of computing resources is much lower.

关键词： Pico-satellite Attitude estimation Bias momentum Magnetometer Kalman filter(KF)

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An end-to-end 3D seismic simulation of underground structures due to point dislocation source by using an FK-FEM hybrid approach

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Frontiers of Structural and Civil Engineering 2022年第12期16卷 1515-1529页

作者： Zhenning BA Jisai FU Zhihui ZHU hao zhong State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300350China National Engineering Research Center of High Speed Railway Construction Technology Central South UniversityChangsha 410075China School of Civil Engineering Central South UniversityChangsha 410075China

Based on the domain reduction idea and artificial boundary substructure method,this paper proposes an FK-FEM hybrid approach by integrating the advantages of FK and FEM(i.e.,FK can efficiently generate high-frequency three translational motion,while FEM has rich elements types and constitutive models).An advantage of this approach is that it realizes the entire process simulation from point dislocation source to underground *** with the plane wave field input method,the FK-FEM hybrid approach can reflect the spatial variability of seismic motion and the influence of source and propagation *** approach can provide an effective solution for seismic analysis of underground structures under scenario of earthquake in regions where strong earthquakes may occur but are not recorded,especially when active faults,crustal,and soil parameters are *** Daikai subway station as an example,the seismic response of the underground structure is simulated after verifying the correctness of the approach and the effects of crustal velocity structure and source parameters on the seismic response of Daikai station are *** this example,the influence of velocity structure on the maximum interlayer displacement angle of underground structure is 96.5%and the change of source parameters can lead to the change of structural failure direction.

关键词： source-to-structure simulation FK-FEM hybrid approach underground structures point dislocation source

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The Intersection Numbers of Nearly Kirkman Triple Systems

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Acta Mathematica Sinica,English Series 2016年第12期32卷 1430-1450页

作者： Bing Li FAN zhong hao JIANG Institute of Mathematics Beijing Jiaotong University

In this paper, we investigate the intersection numbers of nearly Kirkman triple ***[V] is the set of all integers k such that there is a pair of NKTS（v）s with a common uncovered collection of 2-subset intersecting in k triples. It has been established that JN[v] = {0, 1,. v（v-2）/6-6,v（v-2）/6-4,v（v-2）/6} for any integers v = 0 （mod 6） and v ≥ 66. For v ≤ 60, there are 8 cases leftundecided.

关键词： Nearly kirkman triple system parallel class frame intersection number

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碳酸钙/桉木复合材料的制备及力学性能研究

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森林工程 2025年第1期41卷 50-58页

作者：钟昊林作鹏王亚男郭明辉东北林业大学生物质材料科学与技术教育部国家重点实验室哈尔滨150040

为扩大木材在室外反光材料领域的应用,使用氯化钙、碳酸氢钠对桉木交替真空浸渍的矿化方法,模拟天然贝壳有机/无机复合结构,通过热压法制备出一系列不同碳酸钙(CaCO_(3))含量的碳酸钙/桉木复合材料。通过对其进行结构表征及性能测试,探... 详细信息

为扩大木材在室外反光材料领域的应用,使用氯化钙、碳酸氢钠对桉木交替真空浸渍的矿化方法,模拟天然贝壳有机/无机复合结构,通过热压法制备出一系列不同碳酸钙(CaCO_(3))含量的碳酸钙/桉木复合材料。通过对其进行结构表征及性能测试,探究CaCO_(3)对矿化材料结构和性能的影响。结果表明,CaCO_(3)能够增强矿化材料的力学性能,提高其热稳定性以及对太阳光线的反射能力,降低材料受光照而发热的温度。当矿化时间低于3 d时,抗拉强度随CaCO_(3)的含量增加而提高,最高为18.35 MPa,过程呈现多次断裂;当矿化时间达到4 d时,材料对太阳光线的反射率达到80%以上,相比原始木材自身温度降低了10℃。这种环境友好型材料在户外反光隔热领域具有一定的应用潜力。

关键词：碳酸钙桉木仿生矿化光热效应热稳定性

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Extraction,Optical Properties and Bio-Imaging of Fluorescent Composition From Moso Bamboo Shoots

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Journal of Renewable Materials 2019年第11期7卷 1209-1219页

作者： Jinlai Yang Liangru Wu Yanhong Pan hao zhong China National Bamboo Research Center Hangzhou310012China Key Laboratory of High Efficient Processing of Bamboo of Zhejiang Province Hangzhou310012China Key Laboratory of Resources and Utilization of Bamboo of State Forestry Administration Hangzhou310012China

A novel fluorescent composition was firstly isolated from natural winter fresh Moso bamboo shoots,and its optical properties were fully investigated by fluorescence *** could emit strong blue light both in solid and solution state,providing high fluorescence intensity in *** solution’s concentration and addition of water greatly affected the fluorescence intensity,high concentration and addition of much water could quench *** results showed that the fluorescent extract(0-25 mg/L)could not induce apoptosis of Hela *** fluorescent microscopic imaging in human hepatocellular carcinoma cells(HepG2)was realized using the fluorescent extract,it could dye the whole cell well which was different from 4',6-diamidino-2-phenylindole(DAPI)only dying cell *** fluorescent extract may be candidate for future natural fluorescent bio-imaging agent.

关键词： Bamboo shoots extraction fluorescent composition optical properties bio-imaging

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Microstructure and Mechanical Properties of Wire + Arc Additively Manufactured 2050 Al–Li Alloy Wall Deposits

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Chinese Journal of Mechanical Engineering 2019年第6期32卷 174-180页

作者： hao zhong Bojin Qi Baoqiang Cong Zewu Qi Hongye Sun School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China MIIT Key Laboratory of Aeronautics Intelligent Manufacturing Beijing 100191China

Aluminum–Lithium(Al–Li) alloy is a topic of great interest owing to its high strength and light weight, but there are only a few applications of Al–Li alloy in wire ss, a special AA2050 Al–Li alloy + arc additive manufacturing(WAAM) process. To identify its feasibility in WAAM procewire was produced and employed in the production of straight-walled components, using a WAAM system based on variable polarity gas tungsten arc welding(VP-GTAW) process. The influence of post-deposited heat treatment on the microstructure and property of the deposit was investigated using optical micrographs(OM), scanning electron microscopy(SEM), X-ray diffraction(XRD), hardness and tensile properties tests. Results revealed that the microstructures of AA2050 aluminum deposits varied with their location layers. The upper layers consisted of fine equiaxed grains, while the bottom layer exhibited a coarse columnar structure. Mechanical properties witnessed a significant improvement after post-deposited heat treatment, with the average micro-hardness reaching 141 HV and the ultimate tensile strength exceeding 400 MPa. Fracture morphology exhibited a typical ductile fracture.

关键词： Aluminum-copper-lithium alloy Wire arc additive manufacturing Heat treatment Mechanical properties

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Impact of COVID-19 on the clinical status of patients with Wilson disease

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World Journal of Gastroenterology 2021年第26期27卷 4248-4251页

作者： Yu-Pei Zhuang hao-Jie zhong Department of Gastroenterology The First Affiliated Hospital of Guangdong Pharmaceutical UniversityGuangzhou 510080Guangdong ProvinceChina School of Biology and Biological Engineering South China University of TechnologyGuangzhou 510000Guangdong ProvinceChina Institute of Microbiology Guangdong Academy of SciencesGuangzhou 510000Guangdong ProvinceChina

The coronavirus disease 2019(COVID-19)pandemic has greatly impacted health *** guidelines on chronic liver diseases have been released to optimize the use of medical resources and patient ***,most of these guidelines have been established through expert consensus because the existing data do not provide strong evidence for developing effective *** Wilson disease(WD)is a rare chronic liver disease,the impact of COVID-19 on the clinical status of patients with WD is *** present study showed a marked shortage of medical resources for clinically managing patients with WD during the *** patients with WD who consistently took anticopper therapy showed no significant differences in hepatic and extrahepatic markers before and after the pandemic,their complication incidences,especially the infection incidence,were significantly increased during the study ***,patients with WD should be encouraged to adhere to anticopper therapy and be closely monitored to prevent infections and other *** present study provides a clinical basis for further managing WD during the pandemic.

关键词： Coronavirus disease 2019 Wilson disease Clinical status Complications Infections Anticopper therapy

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Optimized XML Storage in NXD Based on Tree-Structure Disassemble

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Wuhan University Journal of Natural Sciences 2006年第1期11卷 93-99页

作者： LIU Yun-sheng WANG Yi zhong hao School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074Hubei China

Independent XML storage based on XSD （XML Schema Document） is adopted in NXD（Native XML Data base）, XMI. storage structure based on tree-structure disassemble and the algorithm used in dynamically updating XML document are provided in this paper. The main idea is that in term of data model of XML document, XML document is parsed to Document Structure-Tree with Hierarchical Model and Leaf-Data with Relation Model for storage. Simultaneously Proxy node is imported in order to solve the problem that XML data store in cross-blocks. And with XSD model information, sparse index is constructed to save storage space. It is proved that this storage structure could improve efficiency of XML document operation.

关键词： XML storage storage model NXD (native XML database) document trees regular expression

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