检索结果-南通市图书馆

Learning Human-Written Commit messages to Document Code Changes

Journal of Computer science & Technology 2020年第6期35卷 1258-1277页

作者： Yuan Huang Nan Jia Hao-Jie Zhou Xiang-Ping Chen Zi-Bin Zheng ming-Dong Tang National Engineering Research Center of Digital Life School of Data and Computer ScienceSun Yat-sen University Guangzhou 510006China School of Information Engineering Hebei GEO UniversityShijiazhuang 050031China Guangdong Key Laboratory for Big Data Analysis and Simulation of Public Opinion School of Communication and DesignSun Yat-sen UniversityGuangzhou 510006China School of Information science and Technology Guangdong University of Foreign StudiesGuangzhou 510006China Guangdong Key Laboratory of Big Data Analysis and Processing Guangzhou 510006China

Commit messages are important complementary information used in understanding code changes. To address message scarcity, some work is proposed for automatically generating commit messages. However, most of these approaches focus on generating summary of the changed software entities at the superficial level, without considering the intent behind the code changes (e.g., the existing approaches cannot generate such message:"fixing 'null' pointer exception"). Considering developers often describe the intent behind the code change when writing the messages, we propose ChangeDoc, an approach to reuse existing messages in version control systems for automatical commit message generation. Our approach includes syntax, semantic, pre-syntax, and pre-semantic similarities. For a given commit without messages, it is able to discover its most similar past commit from a large commit repository, and recommend its message as the message of the given commit. Our repository contains half a million commits that were collected from SourceForge. We evaluate our approach on the commits from 10 projects. The results show that 21.5% of the recommended messages by ChangeDoc can be directly used without modification, and 62.8% require minor modifications. In order to evaluate the quality of the commit messages recommended by ChangeDoc, we performed two empirical studies involving a total of 40 participants (10 professional developers and 30 students). The results indicate that the recommended messages are very good approximations of the ones written by developers and often include important intent information that is not included in the messages generated by other tools.

关键词： commit message recommendation code syntax similarity code semantic similarity code change comprehension

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

mitigating parametric instabilities in plasmas by sunlight-like lasers

引用

matter and Radiation at Extremes 2021年第5期6卷 54-61页

作者： H.H.ma X.F.Li S.m.Weng S.H.Yew S.Kawata P.Gibbon Z.m.Sheng J.Zhang Key Laboratory for Laser Plasmas(moE) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China Graduate School of Engineering Utsunomiya UniversityYohtoh 7-1-2Utsunomiya 321-8585Japan Institute for Advanced Simulation J¨ulich Supercomputing CentreForschungszentrum J¨ulich52425 J¨ulichGermany Centre for mathematical Plasma Astrophysics Katholieke Universiteit Leuven3000 LeuvenBelgium SUPA Department of PhysicsUniversity of StrathclydeGlasgow G40NGUnited Kingdom Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

Sunlight-like lasers that have a continuous broad frequency spectrum,random phase spectrum,and random polarization are formulated *** a sunlight-like laser beam consisting of a sequence of temporal speckles,the resonant three-wave coupling that underlies parametric instabilities in laser–plasma interactions can be greatly degraded owing to the limited duration of each speckle and the frequency shift between two adjacent *** wave coupling can be further weakened by the random polarization of such *** simulations demonstrate that the intensity threshold of stimulated Raman scattering in homogeneous plasmas can be doubled by using a sunlight-like laser beam with a relative bandwidth of∼1%as compared with a monochromatic laser ***,the hot-electron generation harmful to inertial confinement fusion can be effectively controlled by using sunlight-like laser *** drivers may be realized in the next generation of broadband lasers by combining two or more broadband beams with independent phase spectra or by applying polarization smoothing to a single broadband beam.

关键词： polarization scattering speckle

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Coalition Game Based Full-Duplex Concurrent Scheduling in millimeter Wave Wireless Backhaul Network

引用

china Communications 2019年第2期16卷 59-75页

作者： Haiyan Jiang Yong Niu Jiayi Zhang Bo Ai Zhangdui Zhong The State Key Laboratory of Rail Traffic Control and Safety and the School of Electronic and Information EngineeringBeijing Jiaotong University

With the development of self-interference(SI) cancelation technology, full-duplex(FD) communication becomes possible. FD communication can theoretically double the spectral efficiency. When the time slot(TS) resources are limited and the number of flows is large, the scheduling mechanism of the flows becomes more important. Therefore, the effectiveness of FD scheduling mechanism for the flows is studied in millimeter wave wireless backhaul network with the limited TS resources. We proposed a full duplex concurrent scheduling algorithm based on coalition game(FDCG) to maximize the number of flows with their QoS requirements satisfied. We transformed the problem of maximizing the number of flows with their QoS requirements satisfied into the problem of maximizing sum rate of concurrently scheduled flows in each slot. We obtained the scheduled flows with maximum sum rate in first slot by using coalition *** then with certain restrictions, the maximum sum rate of concurrently scheduled flows can also be achieved in subsequent time slots. The simulation results show that the proposed FDCG algorithm canachieve superior performance in terms of the number of flows that meet their QoS requirements and system throughput compared with other three algorithms.

关键词： millimeter wave wireless backhaul network coalition game concurrent scheduling maximum sum rate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Autonomous maneuver strategy of swarm air combat based on DDPG

引用

Autonomous Intelligent Systems 2021年第1期1卷 232-243页

作者： Luhe Wang Jinwen Hu Zhao Xu Chunhui Zhao School of Automation Northwestern Polytechnical UniversityXi’an 710129China School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710129China

Unmanned aerial vehicles(UAVs)have been found significantly important in the air combats,where intelligent and swarms of UAVs will be able to tackle with the tasks of high complexity and *** key to empower the UAVs with such capability is the autonomous maneuver decision *** this paper,an autonomous maneuver strategy of UAV swarms in beyond visual range air combat based on reinforcement learning is ***,based on the process of air combat and the constraints of the swarm,the motion model of UAV and the multi-to-one air combat model are ***,a two-stage maneuver strategy based on air combat principles is designed which include inter-vehicle collaboration and target-vehicle ***,a swarm air combat algorithm based on deep deterministic policy gradient strategy(DDPG)is proposed for online strategy ***,the effectiveness of the proposed algorithm is validated by multi-scene *** results show that the algorithm is suitable for UAV swarms of different scales.

关键词： Deep reinforcement learning Cooperative air combat Swarm maneuver strategy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Analysis and Design of Four-Plate Capacitive Wireless Power Transfer System for undersea Applications

引用

CES Transactions on Electrical machines and Systems 2021年第3期5卷 202-211页

作者： Lei Yang Yuanqi Zhang Xiaojie Li Jiale Jian Zhe Wang Jingjing Huang Li ma Xiangqian Tong School of Electrical Enginerring Xi’an Technology of UniversityXi’an710048China the School of Electronic and Information Engineering Xi’an Jiaotong UniversityXi’an 710049China

This paper presents a four-plate undersea capacitive wireless power transfer(CPT)system for underwater applications such as autonomous underwater vehicles(AUVs).Generally,a CPT system transfers the power based on electric *** complex resonant compensation networks are used to make the CPT system work in the resonant *** resonant voltage is always very *** will be a big challenge to the human *** this paper,a virtual electrons periodic reciprocating flow theory is proposed for the CPT *** one switching cycle,the electrons firstly flow in the forward direction through the forward path and then flow in the inverse direction through the inverse *** CPT system has been deeply studied with the vacuum dielectric or the air ***,for the CPT system,there are few papers to show the underwater *** this paper,an undersea four-plate CPT system is designed and studied in the underwater *** two coupling capacitors and other elements of the CPT system could build a closed-loop path.A small value inductor is adapted as a resonant compensation network for the four-plate CPT *** DC voltage is inverted to the AC voltage in the primary side with the single-phase full-bridge *** resonant voltage is rectified to the DC voltage in the secondary side with the single-phase full-bridge diode rectifier.A 100 W power level CPT system is constructed to verify the theory analysis and the *** theory analysis is verified by the simulated and experimental *** stable output voltage and load power are achieved in this paper.

关键词： Wireless power transfer system capacitive underwater applications autonomous underwater vehicles(AUVs)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research on the mechanical properties and electrical conductivity of cement mortar based on recycled nano-iron boride

引用

Waste Disposal and Sustainable Energy 2021年第2期3卷 155-164页

作者： Wei He Zhinan Jiao Yawei Wang Jihang Xu Qingxin Zhao College of Architectural Engineering and mechanics Yanshan UniversityQinhuangdao 066004China Key Laboratory of Green Construction and Intelligent maintenance for Civil Engineering of Hebei Province Yanshan UniversityQinhuangdao 066004China State Key Laboratory of metastable materials science and Technology Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China

Traditional cement-based materials are being gradually replaced by nanomodified cement-based materials because the traditional materials cannot meet the production needs of modern ***-iron boride(nano-FeB)is a high-performance nanomaterial prepared from waste iron powder during *** one-dimensional structure is similar to that of carbon nanotubes,which makes it a potential candidate for nano-reinforcement *** this paper,the effects of different contents of recycled nano-FeB(0%,0.05%,0.075%,and 0.1 wt.%,based on cement weight)on the mechanical properties and electrical conductivity of cement mortar were *** results showed that the mechanical properties of the composite cement mortar were improved with the addition of *** the content of nano-FeB was 0.075%,the 28 d compressive strength and flexural strength of the composite cement mortar increased by 60.2%and 42.1%,*** addition,a 0.075%nano-FeB content favorably improved the conductivity of cement *** with that of the control group,the volume resistivity of the composite cement mortar decreased by one order of magnitude.

关键词： Construction waste iron powder Recycled nano-FeB Composite cement mortar Compressive strength Flexural strength Electrical conductivity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Co-Ru alloy nanoparticles decorated onto two-dimensional nitrogen doped carbon nanosheets towards hydrogen/oxygen evolution reaction and oxygen reduction reaction

引用

Journal of Energy Chemistry 2023年第12期87卷 286-294,I0008页

作者： Huizhen Wang Pengfei Yang Xiaoyuan Sun Weiping Xiao Xinping Wang minge Tian Guangrui Xu Zhenjiang Li Yubing Zhang Fusheng Liu Lei Wang Zexing Wu Key Laboratory of Eco-chemical Engineering Ministry of EducationInternational Science and Technology Cooperation Base of Eco-chemical Engineering and Green ManufacturingCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina College of science Nanjing Forestry UniversityNanjing 210037JiangsuChina Scientific Green(Shandong)Environmental Technology Co.Ltd Jining Economic Development ZoneJining 272499ShandongChina School of materials science and Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina

Constructing highly-efficient electrocatalysts toward hydrogen evolution reaction(HER)/oxygen evolution reaction(OER)/oxygen reduction reaction(ORR)with excellent stability is quite important for the development of renewable energy-related ***,Co-Ru based compounds supported on nitrogen doped two-dimensional(2D)carbon nanosheets(NCN)are developed via one step pyrolysis procedure(Co-Ru/NCN)for HER/ORR and following low-temperature oxidation process(Co-Ru@RuO_(x)/NCN)for *** specific 2D morphology guarantees abundant active sites ***,the synergistic effects arising from the interaction between Co and Ru are crucial in enhancing the catalytic ***,the resulting Co-Ru/NCN shows remarkable electrocatalytic performance for HER(70 mV at 10 mA cm^(-2))in 1 m KOH and ORR(half-wave potential E_(1/2)=0.81 V)in 0.1 m ***,the Co-Ru@RuO_(x)/NCN obtained by oxidation exhibits splendid OER performance in both acid(230 mV at 10 mA cm^(-2))and alkaline media(270 mV at 10 mA cm^(-2))coupled with excellent ***,the fabricated two-electrode water-splitting device exhibits excellent performance in both acidic and alkaline *** research provides a promising avenue for the advancement of multifunctional nanomaterials.

关键词： Electrocatalyst 2D Carbon nanosheet Hydrogen/oxygen evolution reaction Oxygen reduction reaction Water-splitting

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Numerical Study on Hydraulic Fracturing Problems via the Proper Generalized Decomposition method

引用

Computer modeling in Engineering & sciences 2020年第2期122卷 703-720页

作者： Daobing Wang Sergio Zlotnik Pedro Díez Hongkui Ge Fujian Zhou Bo Yu School of mechanical Engineering Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil&Gas DevelopmentBeijing Institute of Petrochemical TechnologyBeijing102617China. Laboratori de Càlcul Numèric(LaCàN) ETS de Ingeniero de CaminosCanales y PuertosUniversitat Politècnica de CatalunyaBarcelonaE-08034Spain. Research Institute of Unconventional Oil and Gas science and Technology China University of PetroleumBeijing102249China. Department of Oil&Gas Transportation and Engineering Beijing Institute of Petrochemical TechnologyBeijing102617China.

The hydraulic fracturing is a nonlinear,fluid-solid coupling and transient problem,in most cases it is always time-consuming to simulate this process *** recent years,although many numerical methods were proposed to settle this problem,most of them still require a large amount of computer *** it is a high demand to develop more efficient numerical approaches to achieve the real-time monitoring of the fracture geometry during the hydraulic fracturing *** this study,a reduced order modeling technique namely Proper Generalized Decomposition(PGD),is applied to accelerate the simulations of the transient,non-linear coupled system of hydraulic fracturing problem,to match this extremely tight response time *** separability of the solution in space and time dimensions is studied for a simplified model *** solid and fluid equations are coupled explicitly by inverting the solid discrete problem,and a simple iterative procedure to handle the non-linear characteristic of the hydraulic fracturing problem is proposed in this *** validation illustrates that the results of PGD match well with these of standard finite element method in terms o f fracture opening and fluid pressure in the ***,after the off-line calculations,the numerical results can be obtained in real time.

关键词： Hydraulic fracturing proper generalized decomposition reduced order modeling numerical simulation.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering multipartite steady entanglement of distant atoms via dissipation

引用

Frontiers of physics 2018年第5期13卷 165-174页

作者： Zhao Jin S.-L. Su Ai-Dong Zhu Hong-Fu Wang Shou Zhang Department of Physics Harbin Institute of Technology Harbin 150001 China School of Physics and Engineering Zhengzhou University Zhengzhou 450001 China Department of Physics College of Science Yanbian University Yanji dilin 133002 China

We propose a scheme for generating an entangled state for three atoms trapped in separate optical cavities that are coupled to each other through two optical fibers based on coherent driving and dissi- pation, which are induced by the classical fields and the decay of non-local bosonic modes, respectively. In our scheme, the interaction time need not be controlled strictly in the overall dynamics process, and the cavity field decay can be changed into a vital resource. The numerical simulation shows that the fidelity of the target state is insensitive to atomic spontaneous emission, and our scheme is good enough to generate the W state of distant atoms with a high fidelity and purity. In addition, the present scheme can also be generalized to prepare the N-partite W state of distant atoms.

关键词： steady-state entanglement dissipative dynamics laser manipulation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cross Project Defect Prediction via Balanced Distribution Adaptation Based Transfer Learning

引用

Journal of Computer science & Technology 2019年第5期34卷 1039-1062页

作者： Zhou Xu Shuai Pang Tao Zhang Xia-Pu Luo Jin Liu Yu-Tian Tang Xiao Yu Lei Xue College of Computer science and Technology Harbin Engineering UniversityHarbin 150001China School of Computer science Wuhan UniversityWuhan 430072China Department of Computing The Hong Kong Polytechnic UniversityHong Kong 999077China Department of ComputingThe Hong Kong Polytechnic UniversityHong Kong 999077China Key Laboratory of Network Assessment Technology Institute of Information EngineeringChinese Academy of Sciences Beijing 100190China Guangxi Key Laboratory of Trusted Software Guilin University of Electronic TechnologyGuilin 541004China Department of Computer science City University of Hong KongHong Kong 999077China

Defect prediction assists the rational allocation of testing resources by detecting the potentially defective software modules before releasing products. When a project has no historical labeled defect data, cross project defect prediction (CPDP) is an alternative technique for this scenario. CPDP utilizes labeled defect data of an external project to construct a classification model to predict the module labels of the current project. Transfer learning based CPDP methods are the current mainstream. In general, such methods aim to minimize the distribution differences between the data of the two projects. However, previous methods mainly focus on the marginal distribution difference but ignore the conditional distribution difference, which will lead to unsatisfactory performance. In this work, we use a novel balanced distribution adaptation (BDA) based transfer learning method to narrow this gap. BDA simultaneously considers the two kinds of distribution differences and adaptively assigns different weights to them. To evaluate the effectiveness of BDA for CPDP performance, we conduct experiments on 18 projects from four datasets using six indicators (i.e., F-measure, g-means, Balance, AUC, EARecall, and EAF-measure). Compared with 12 baseline methods, BDA achieves average improvements of 23.8%, 12.5%, 11.5%, 4.7%, 34.2%, and 33.7% in terms of the six indicators respectively over four datasets.

关键词： cross-project defect prediction transfer learning balancing distribution effort-aware indicator

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：