检索结果-南通市图书馆

What can we learn from quality assurance badges in open-source software?

在线全文

学校读者我要写书评

暂无评论

science china(Information sciences) 2024年第4期67卷 146-163页

作者： feng li Yiling LOU Xin TAN Zhenpeng CHEN Jinhao dong Yang li Xuanzhi WANG Dan HAO Lu ZHANG MoE Key Lab of HCST School of Computer SciencePeking University Department of computer science Purdue University school of computer science & Engineering Beihang University(BUAA) Department of computer science University College London(UCL)

In the development of open-source software(OSS), many developers use badges to give an overview of the software and share some key features/metrics conveniently. Among various badges, quality assurance(QA) badges make up a large proportion and are the most prevalent because QA is of vital importance in software development, and ineffective QA may lead to anomalies or defects. In this paper, we focus on QA badges in open-source projects, which present quality assurance information directly and instantly,and aim to produce some interesting findings and provide practical implications. We collect and analyze 100000 projects written in popular programming languages from GitHub and conduct a comprehensive empirical study both inside and outside QA badges. Inside QA badges, we build a category classification for all QA badges based on the properties they focus on, which shows the types of QA badges developers use. Then,we analyze the frequency of the properties that QA badges focus on, and property combinations, too, which present their use status. We find that QA badges focus on various properties while developers give different preferences to different properties. The use status also differs between different programming languages. For example, projects written in C focus on Security to a great extent. Our findings also provide implications for developers and badge providers. Outside QA badges, we conduct a correlation analysis between QA badges and some software metrics that have potential relationships with code quality, contribution quality, and popularity. We find that QA badges have statistically significant correlations with various software metrics.

关键词： quality assurance badge open-source software code quality empirical study

computer-assisted three-dimensional individualized extreme liver resection for hepatoblastoma in proximity to the major liver vasculature

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第4期16卷 1066-1077页

作者： Wen-li Xiu Jie liu Jing-li Zhang Jing-Miao Wang Xue-feng Wang Fei-Fei Wang Jie Mi Xi-Wei Hao NanXia Qian dong Department of Pediatric Surgery The Affiliated Hospital of Qingdao UniversityQingdao 266000Shandong ProvinceChina Department of Pediatric Surgery Yijishan Hospital of Wannan Medical CollegeWuhu 241000Anhui ProvinceChina Shandong Provincial Key Laboratory of Digital Medicine and computer-assisted Surgery Shandong College Collaborative Innovation Center of Digital Medicine Clinical Treatment and Nutrition HealthQingdao UniversityQingdao 266003Shandong ProvinceChina

BACKGROUND The management of hepatoblastoma(HB)becomes challenging when the tumor remains in close proximity to the major liver vasculature(PMV)even after a full course of neoadjuvant chemotherapy(NAC).In such cases,extreme liver resection can be considered a potential *** To explore whether computer-assisted three-dimensional individualized extreme liver resection is safe and feasible for children with HB who still have PMV after a full course of *** We retrospectively collected data from children with HB who underwent surgical resection at our center from June 2013 to June *** then analyzed the detailed clinical and three-dimensional characteristics of children with HB who still had PMV after a full course of *** Sixty-seven children diagnosed with HB underwent surgical *** age at diagnosis was 21.4±18.8 months,and 40 boys and 27 girls were ***-nine(88.1%)patients had a single tumor,39(58.2%)of which was located in the right lobe of the liver.A total of 47 patients(70.1%)had PRE-TEXT III or ***-nine patients(58.2%)underwent delayed *** a full course of NAC,16 patients still had close PMV(within 1 cm in two patients,touching in 11 patients,compressing in four patients,and showing tumor thrombus in three patients).There were 6 patients of tumors in the middle lobe of the liver,and four of those patients exhibited liver anatomy *** 16 children underwent extreme liver resection after comprehensive preoperative *** procedures were performed according to the preoperative plan,and the operations were successfully ***,the 3-year event-free survival of 67 children with HB is 88%.Among the 16 children who underwent extreme liver resection,three experienced recurrence,and one died due to multiple *** Extreme liver resection for HB that is still in close PMV after a full course of NAC is both safe and *** approach not only reduces th

关键词： Children Hepatoblastoma Surgery Three-dimensional computer-assisted

Identification and distribution of 13003 landslides in the northwest margin of Qinghai-Tibet Plateau based on human-computer interaction remote sensing interpretation

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

china Geology 2024年第2期7卷 171-187页

作者： Wei Wang Yuan-dong Huang Chong Xu Xiao-yi Shao Lei li li-ye feng Hui-ran Gao Yu-long Cui Shuai Wu Zhi-qiang Yang Kai Ma National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China Key Laboratory of Compound and Chained Natural Hazards Dynamics Ministry of Emergency Management of Chin12eijing 100085China school of Emergency Management science and Engineering University of Chinese Academy of SciencesBeijing 100049China school of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China school of Civil Engineering and Architecture Anhui University of Science and TechnologyHuainan 232001China No.3 Bureau of china Metallurgical Geology Bureau Taiyuan 030031China

The periphery of the Qinghai-Tibet Plateau is renowned for its susceptibility to ***,the northwestern margin of this region,characterised by limited human activities and challenging transportation,remains insufficiently explored concerning landslide occurrence and *** the planning and construction of the Xinjiang-Tibet Railway,a comprehensive investigation into disastrous landslides in this area is essential for effective disaster preparedness and mitigation *** using the human-computer interaction interpretation approach,the authors established a landslide database encompassing 13003 landslides,collectively spanning an area of 3351.24 km^(2)(36°N-40°N,73°E-78°E).The database incorporates diverse topographical and environmental parameters,including regional elevation,slope angle,slope aspect,distance to faults,distance to roads,distance to rivers,annual precipitation,and *** statistical characteristics of number and area of landslides,landslide number density(LND),and landslide area percentage(LAP)are *** authors found that a predominant concentration of landslide origins within high slope angle regions,with the highest incidence observed in intervals characterised by average slopes of 20°to 30°,maximum slope angle above 80°,along with orientations towards the north(N),northeast(NE),and southwest(SW).Additionally,elevations above 4.5 km,distance to rivers below 1 km,rainfall between 20-30 mm and 30-40 mm emerge as particularly susceptible to landslide *** study area’s geological composition primarily comprises Mesozoic and Upper Paleozoic *** fault and human engineering activities have different degrees of influence on landslide ***,the significance of the landslide database,the relationship between landslide distribution and environmental factors,and the geometric and morphological characteristics of landslides are *** landslide H/L ratios in the study area are

关键词： Landslides Human-computer interaction interpretation Landslide database Spatial distribution Earthquake Rainfall Human engineering activity Qinghai-Tibet Plateau Geological hazards survey engineering

Highly transparent anti-reflection coating enhances the underwater efficiency and stability of perovskite solar modules

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 8126-8133页

作者： feng Qian Shihao Yuan Ting Zhang Lei Wang Xiaobo li Hualin Zheng Qien Xu Zhi David Chen Shibin li school of Optoelectronic science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China Department of Electrical and computer Engineering and Center for Nanoscale science and Engineering University of KentuckyLexingtonKentucky 40506USA

Perovskite solar cells have shown great potential in the field of underwater solar cells due to their excellent optoelectronic properties;however,their underwater performance and stability still hinder their practical *** this research,a 1H,1H,2H,2H-heptadecafluorodecyl acrylate(HFDA)anti-reflection coating(ARC)was introduced as a high-transparent material for encapsulating perovskite solar modules(PSMs).Optical characterization results revealed that HFDA can effectively reduce reflection of light below 800 nm,aiding in the absorption of light within this wavelength range by underwater solar ***,a remarkable efficiency of 14.65%was achieved even at a water depth of 50 ***,the concentration of Pb^(2+)for HFDA-encapsulated film is significantly reduced from 186 to 16.5 ppb after being immersed in water for 347 ***,the encapsulated PSMs still remained above 80%of their initial efficiency after continuous underwater illumination for 400 ***,being exposed to air,the encapsulated PSMs maintained 94%of their original efficiency after 1000 h light *** highly transparent ARC shows great potentials in enhancing the stability of perovskite devices,applicable not only to underwater cells but also extendable to land-based photovoltaic devices.

关键词： underwater photovoltaics perovskite solar modules anti-reflection coating underwater stability

Up-conversion emissions of Er^(3+)-Yb^(3+) codoped Al_2O_3 nanoparticles by the arc discharge synthesis method

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

science china(Physics,Mechanics & Astronomy) 2009年第7期52卷 1043-1046页

作者： dong Bin1, CAO BaoSheng1, feng ZhiQing1, WANG XingJun2, li ChengRen3 & HUA RuiNian4 1 school of science, Dalian Nationalities university, Dalian 116600, china 2 school of Electronics Engineering and computer science, Peking university, Beijing 100871, china 3 College of Physics and Electronic technology, liaoning Normal university, Dalian 116029, china 4 College of life science, Dalian Nationalities university, Dalian 116600, china 1. school of science Dalian Nationalities University Dalian 116600 China 2. school of Electronics Engineering and computer science Peking University Beijing 100871 China 3. College of Physics and Electronic technology Liaoning Normal University Dalian 116029 China 4. College of life science Dalian Nationalities University Dalian 116600 China

The Er3+-Yb3+ codoped Al2O3 nanoparticles with an average particle size of about 50 nm have been synthesized by an arc discharge synthesis method. The green and red up-conversion emissions centered at about 526, 547 and 677 nm, corresponding respectively to the 2H11/2→4I15/2, 4S3/2→4I15/2 and 4 F9/2→4I15/2 transitions of Er3+, were detected by a 978-nm semiconductor laser diode excitation. The Annealing has evident effect on the up-conversion emissions of the samples: The red up-conversion emission is noticeable before annealing; however, the green up-conversion emission becomes predominant after annealing. The mixture of (Er,Yb)3Al5O12 and α-(Al,Er,Yb)2O3 phases is more favorable for green up-conversion emissions due to an enhancement of the ESA (I) of 4I11/2+a photon→4F7/2 and ET (III) of 2F5/2(Yb3+)+4I11/2(Er3+)→2F7/2(Yb3+)+4F7/2(Er3+) processes. The two-photon absorption up-conversion process is involved in the green and red up-conversion emissions. The results have proved that arc discharge synthesis is a new promising preparation technology for optical materials.

关键词： up-conversion Er3+-Yb3+ codoped Al2O3 arc discharge synthesis

在线全文

学校读者我要写书评

暂无评论

基于DM2的可扩展DBMS体系结构研究

计算机工程与应用 2001年第18期37卷 119-121页

作者：冯玉才张东李东华中理工大学计算机学院武汉430074

目前，日益变化的数据管理要求和新型数据库应用的出现，要求DBMS具有良好的可扩展性与可伸缩性，能方便快速地加入新的数据库功能，以适应新的应用需求。DM2是拥有国产自主版权的分布式DBMS系统，它采用当前最流行的客户/服务器模型结... 详细信息

目前，日益变化的数据管理要求和新型数据库应用的出现，要求DBMS具有良好的可扩展性与可伸缩性，能方便快速地加入新的数据库功能，以适应新的应用需求。DM2是拥有国产自主版权的分布式DBMS系统，它采用当前最流行的客户/服务器模型结构。文章介绍了一种基于DM2的可扩展DBMS体系结构及数据库组件化技术的应用。

关键词：分布式数据库管理系统体系结构软件复用组件 DBMS

Generating and AnalyzingN-di mensional Hilbert Cell

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information science 2005年第4期8卷 297-305页

作者： feng yucai li Chenyang school of computer science and technology Huazhong University of Science and Technology Guanshan Wuhan 430074 China 不详

In this paper, two algorithms are presented for generating two code scan lists of an N dimensional Hilbert cell, and a formal proof of the backward encoding algorithm is given. On the basis of the self similarity properties of a Hilbert curve, this paper gives a novel algorithm for generating a static evolvement rule table through analyzing a Hilbert cell. By looking up the static evolvement rule table, the N dimensional Hilbert mappings are efficiently implemented.

关键词： algorithm Hilbert curve space-filling curve

在线全文

学校读者我要写书评

暂无评论

云原生数据库综述

软件学报 2024年第2期35卷 899-926页

作者：董昊文张超李国良冯建华清华大学计算机科学与技术系北京100084

云基础设施的虚拟化、高可用、可弹性调度等特点,为云数据库提供了开箱即用、可靠可用、按需计费等优势.云数据库按照架构可以划分为云托管数据库(cloud-hosted database)以及云原生数据库(cloud-native database).云托管数据库将数据... 详细信息

云基础设施的虚拟化、高可用、可弹性调度等特点,为云数据库提供了开箱即用、可靠可用、按需计费等优势.云数据库按照架构可以划分为云托管数据库(cloud-hosted database)以及云原生数据库(cloud-native database).云托管数据库将数据库系统直接部署到云上虚拟机环境中,具备低成本、易运维、高可靠的优势.在此基础上,云原生数据库充分利用云基础设施弹性伸缩的特点,采用计算存储分离的架构,实现了计算资源和存储资源的独立伸缩,进一步提升数据库性价比.然而计算存储分离的架构为数据库系统设计带来了新的挑战.深入分析云原生数据库系统的架构和技术.首先将云原生OLTP和云原生OLAP的数据库架构按照资源分离模式的差异分别进行归类分析,并对比各类架构的优势与局限.其次,基于计算存储分离的架构,按照各个功能模块深入探讨云原生数据库的关键技术:主要包括云原生OLTP关键技术(数据组织、副本一致性、主备同步、故障恢复以及混合负载处理)和云原生OLAP关键技术(存储管理、查询处理、无服务器感知计算、数据保护以及机器学习优化).最后,总结现有云原生数据库的技术挑战并展望未来研究方向.

关键词：云原生数据库计算存储分离数据库即服务

在线全文

学校读者我要写书评

暂无评论

基于区块链的园区碳排放可信监测模型

中国电力 2024年第7期57卷 182-187页

作者：王栋冯景丽李达牛静伟李军国网区块链科技(北京)有限公司北京100053 北京信息科技大学计算机学院北京102206

构建了基于能源电力区块链的园区碳排放可信监测数字模型。首先,利用区块链防篡改技术保障监测数据的可信存证要求,相关接入实体指标全部由联盟链进行身份认证和权限控制,避免了数据遗失以及主体以外其他人恶意篡改的风险;其次,在具体... 详细信息

构建了基于能源电力区块链的园区碳排放可信监测数字模型。首先,利用区块链防篡改技术保障监测数据的可信存证要求,相关接入实体指标全部由联盟链进行身份认证和权限控制,避免了数据遗失以及主体以外其他人恶意篡改的风险;其次,在具体的监测指标融合过程中,结合层次分析法,构建碳排放评价指标融合策略,对能源电力相关指标数据结合相似性聚类算法进行多源在线融合;最后,基于局部异常因子算法(local outlier factor,LOF)实现指标数据长周期异常离群检测,一定程度上解决数据畸变和错报自筛难题。

关键词：区块链碳排放监测层次决策