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新型数据管理系统研究进展与趋势 被引量:32
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作者 崔斌 高军 +3 位作者 童咏昕 许建秋 张东祥 邹磊 《软件学报》 EI CSCD 北大核心 2019年第1期164-193,共30页
随着各类新型计算技术和新兴应用领域的浮现,传统数据库技术面临新的挑战,正在从适用常规应用的单一处理方法逐步转为面向各类特殊应用的多种数据处理方式.分析并展望了新型数据管理系统的研究进展和趋势,涵盖分布式数据库、图数据库、... 随着各类新型计算技术和新兴应用领域的浮现,传统数据库技术面临新的挑战,正在从适用常规应用的单一处理方法逐步转为面向各类特殊应用的多种数据处理方式.分析并展望了新型数据管理系统的研究进展和趋势,涵盖分布式数据库、图数据库、流数据库、时空数据库和众包数据库等多个领域.具体而言:分布式数据管理技术是支持可扩展的海量数据处理的关键技术;以社交网络为代表的大规模图结构数据的处理需求带来了图数据库技术的发展;流数据管理技术用来应对数据动态变化的管理需求;时空数据库主要用于支持移动对象管理;对多源、异构而且劣质数据源的集成需求催生出新型的众包数据库技术.最后讨论了新型数据库管理系统的未来发展趋势. 展开更多
关键词 分布式数据库 数据库 流数据库 时空数据库 众包数据库
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复杂边界条件浮环轴承油膜力模型研究
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作者 张聪聪 周瑜哲 +2 位作者 付晓瑞 冯泽民 蔡长旺 《润滑与密封》 CAS CSCD 北大核心 2024年第10期92-101,共10页
为了增加浮环轴承润滑油的流通性,常在浮环上开设周向槽或轴向槽,然而油槽的存在使得油膜边界复杂化。针对短轴承模型难以处理复杂边界条件以及数值方法计算效率极低的问题,引入和发展了2种油膜力模型——数据库法和分离变量法,以处理... 为了增加浮环轴承润滑油的流通性,常在浮环上开设周向槽或轴向槽,然而油槽的存在使得油膜边界复杂化。针对短轴承模型难以处理复杂边界条件以及数值方法计算效率极低的问题,引入和发展了2种油膜力模型——数据库法和分离变量法,以处理浮环轴承复杂边界和计算效率问题。针对轴向槽轴瓦,基于数据库方法建立具有三维结构的非线性油膜力和摩擦力数据库;而针对周向槽轴瓦,基于分离变量法推导出非线性油膜力解析表达式。通过与有限差分法对比,验证了所发展的油膜力模型具有较高的计算精度和计算效率。 展开更多
关键词 浮环轴承 油膜力模型 分离变量法 体力数据库 复杂边界条件
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Development of CAD software package of intellectualized casting technology 被引量:1
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作者 侯华 程军 徐宏 《Journal of Central South University of Technology》 2005年第3期280-283,共4页
Based on the numerical simulation of solidification, a computer aid design(CAD) software package of casting technique was developed to design the rising system intelligently. The software can calculate the size and lo... Based on the numerical simulation of solidification, a computer aid design(CAD) software package of casting technique was developed to design the rising system intelligently. The software can calculate the size and locate the situations of the isolated melts. According to the liquid shrinkage of each isolated melts and the standard parameters of risers in the database, the riser’s situation and the size can be identified intelligently as long as the riser’s shape is selected. 3-D software and simulation analysis of CAST soft/computer aid engineering(CAE) software show that the design of the riser and the running system is feasible. 展开更多
关键词 CAD casting technique isolated melts rising system running system DATABASE
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Comparative epidemiology of gastric cancer between Japan and China 被引量:64
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作者 Yingsong Lin Junko Ueda +4 位作者 Shogo Kikuchi Yukari Totsuka Wen-Qiang wei You-Lin Qiao Manami Inoue 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第39期4421-4428,共8页
AIM:To clarify the similarities and differences in gastric cancer epidemiology between Japan and China.METHODS:A comprehensive literature search of the PubMed database was performed.The relevant literature published i... AIM:To clarify the similarities and differences in gastric cancer epidemiology between Japan and China.METHODS:A comprehensive literature search of the PubMed database was performed.The relevant literature published in China was also been cited.Data on incidence and mortality rates in 2008 were obtained from the Cancer Mondial database,published by International Agency for Research on Cancer at http://www-dep.iarc.fr/.RESULTS:Gastric cancer remains a significant publichealth burden in both Japan and China.The prevalence of Helicobacter pylori(H.pylori)colonization is high in the adult populations of both countries.Accumulating evidence from intervention studies in both countries has shown the effectiveness of H.pylori eradication in reduc-ing gastric cancer incidence.There are differences,however,in many aspects of gastric cancer,including patterns of incidence and mortality,trends in the prevalence of H.pylori infection,H.pylori strains,the magnitude of risk of gastric cancer related to H.pylori infection,and associations with dietary habits.Compared with China,Japan has seen a more rapid decline in H.pylori infection among adolescents.While Japanese cohort studies have dominated the literature concerning the associations between gastric cancer and dietary habits,numerous case-control studies in China suggest a positive association between a high intake of preserved fish and vegetables and gastric cancer risk.There is a need for a multidisciplinary research approach to understand the interactions between various strains of H.pylori,host factors,and other lifestyle and environmental factors in gastric carcinogenesis in both countries.CONCLUSION:The shared high incidence of gastric cancer and high prevalence of H.pylori,as well as differences in many aspects of gastric cancer,provide an excellent opportunity to establish Sino-Japanese collaborations. 展开更多
关键词 Gastric cancer Risk factor Helicobacter pylori EPIDEMIOLOGY
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Workflow logs analysis system for enterprise performance measurement 被引量:1
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作者 Lai Jin(赖瑾) Fan Yushun 《High Technology Letters》 EI CAS 2005年第3期274-279,共6页
Workflow logs that record the execution of business processes offer very valuable data resource for real-time enterprise performance measurement. In this paper, a novel scheme that uses the technology of data warehous... Workflow logs that record the execution of business processes offer very valuable data resource for real-time enterprise performance measurement. In this paper, a novel scheme that uses the technology of data warehouse and OLAP to explore workflow logs and create complex analysis reports for enterprise performance measurement is proposed. Three key points of this scheme are studied: 1) the measure set; 2) the open and flexible architecture for workflow logs analysis system; 3) the data models in WFMS and data warehouse. A case study that shows the validity of the scheme is also provided. 展开更多
关键词 WORKFLOW business performance measure data warehouse OLAP workflow logs analysis
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Similarity based mixed transaction concurrency control protocol
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作者 潘怡 《Journal of Chongqing University》 CAS 2005年第2期107-112,共6页
Due to the various performance requirements and data access restrictions of different types of real-time transactions, concurrency control protocols which had been designed for the systems with single type of transact... Due to the various performance requirements and data access restrictions of different types of real-time transactions, concurrency control protocols which had been designed for the systems with single type of transactions are not sufficient for mixed real-time database systems (MRTDBS), where different types of real-time transactions coexist in the systems concurrently. In this paper, a new concurrency control protocol MRTT_CC for mixed real-time transactions is proposed. The new strategy integrates with different concurrency control protocols to meet the deadline requirements of different types of real-time transactions. The data similarity concept is also explored in the new protocol to reduce the blocking time of soft real-time transactions, which increases their chances to meet the deadlines. Simulation experiments show that the new protocol has gained good performance. 展开更多
关键词 real-time database semantic concurrency control temporary consistency data similarity
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Study on the forecasting and maintenance system of special railway subsidence in mine area
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作者 王喜富 朱德明 任占营 《Journal of Coal Science & Engineering(China)》 2003年第1期85-89,共5页
The fully mechanized caving coal mining under the railway in mine area will result in difficulty maintenance of railway because of great distortion and subsidence speed of terrene and railway. If the subsidence foreca... The fully mechanized caving coal mining under the railway in mine area will result in difficulty maintenance of railway because of great distortion and subsidence speed of terrene and railway. If the subsidence forecasting is incorrect and maintenance measure is not suitable in the preceding and the process of mining, the normal operation of the railway in mine area will not be ensured and perhaps the safety accident will be resulted. The railway subsidence forecasting and maintenance system for fully mechanized caving coal face are studied and developed in this connection. Based on the accurate subsidence forecasting of the terrene and railway, the maintenance measure for track and switch turnout in railway is put forward in this system. 展开更多
关键词 railway in mine area mining subsidence forecasting and maintenance
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Research and Application of Synchronization Update of Distributed Heterogeneous Database
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作者 Xin Yingxiu 《International Journal of Technology Management》 2014年第5期77-79,共3页
According to the different equipment, different system and heterogeneous database have be information "isolated island" problem, and the data of equipments can be updated in real time on the business node. The paper... According to the different equipment, different system and heterogeneous database have be information "isolated island" problem, and the data of equipments can be updated in real time on the business node. The paper proposes a program of data synchronization platform based on J2EE (JMS) and XML, and detailed analysis and description of the workflow system, its frame structure and the key technology. Practice shows that this scheme has the advantages of convenient and real-time etc.. 展开更多
关键词 data synchronization XML JMS DATABASE real-time updates
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Close Relationship between the 2009 H1N1 Virus and South Dakota AIV Strains
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作者 Cun Li Xiao-ping An Zhi-qiang Mi Da-bin Liu Huan-huan Jiang Bo Pan Sheng Wang Bin Chen Yi-gang Tong 《Virologica Sinica》 SCIE CAS CSCD 2011年第1期54-60,共7页
Although previous publications suggest the 2009 pandemic influenza A (H1N1) virus was reassorted from swine viruses of North America and Eurasia,the immediate ancestry still remains elusive due to the big evolutionary... Although previous publications suggest the 2009 pandemic influenza A (H1N1) virus was reassorted from swine viruses of North America and Eurasia,the immediate ancestry still remains elusive due to the big evolutionary distance between the 2009 H1N1 virus and the previously isolated strains. Since the unveiling of the 2009 H1N1 influenza,great deal of interest has been drawn to influenza,consequently a large number of influenza virus sequences have been deposited into the public sequence databases. Blast analysis demonstrated that the recently submitted 2007 South Dakota avian influenza virus strains and other North American avian strains contained genetic segments very closely related to the 2009 H1N1 virus,which suggests these avian influenza viruses are very close relatives of the 2009 H1N1 virus. Phylogenetic analyses also indicate that the 2009 H1N1 viruses are associated with both avian and swine influenza viruses circulating in North America. Since the migrating wild birds are preferable to pigs as the carrier to spread the influenza viruses across vast distances,it is very likely that birds played an important role in the inter-continental evolution of the 2009 H1N1 virus. It is essential to understand the evolutionary route of the emerging influenza virus in order to find a way to prevent further emerging cases. This study suggests the close relationship between 2009 pandemic virus and the North America avian viruses and underscores enhanced surveillance of influenza in birds for understanding the evolution of the 2009 pandemic influenza. 展开更多
关键词 2009 influenza A (H1N1) virus EVOLUTION Avian influenza virus (AIV)
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The pooled analysis of single gemcitabine for non-small cell lung cancer patients with elderly age 被引量:1
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作者 Fang Wang Liangping Xia +3 位作者 Guifang Guo Huijuan Qiu Feifei Zhou Wenzhuo He 《The Chinese-German Journal of Clinical Oncology》 CAS 2010年第12期683-687,共5页
Objective:Gemcitabine,used as single agent for elderly patients with non-small cell lung cancer (NSCLC),was demonstrated effective in this population based on phase II studies.The aim of this study was to summarize al... Objective:Gemcitabine,used as single agent for elderly patients with non-small cell lung cancer (NSCLC),was demonstrated effective in this population based on phase II studies.The aim of this study was to summarize all those phase II studies with the hope to get a comprehensive understanding of gemcitabine efficacy.Methods:The PubMed database was used to search all the papers on NSCLC associated with gemcitabine used as single agent in the first line setting till to March 31st,2010.And the medians and their 95% CI of overall response rate (ORR),disease control rate (DCR),progression free survival (PFS),and overall survival (OS) were calculated.Results:1.There were 7 papers including 410 patients with performance status (PS) ≤ 2 and advanced stage collected.2.The dose-intensities of gemcitabine were 843.75 mg/m 2 /week-1125 mg/m 2 /week in the 4-week schedule,and 666.7 mg/m 2 /week in the 3-week schedule.3.The median age was 73.8 (95% CI was 72.44,75.16) years old;36.1% (95% CI:31.4%,40.7%) of patients with stage IIIB and 60.5% (95% CI:55.8%,65.2%) of patients with stage IV;35.9% (95% CI:31.2%,40.5%) patients were adenocarcinomas and 43.7% (95% CI:38.9%,48.5%) patients were squamous cell carcinomas (SCCs).4.The ORR,DCR,PFS/TTP,and OS were 22.3% (95% CI:18.2%,26.5%),58.4% (95% CI:53.5%,63.4%),3.6 (95% CI:2.9,5.15) months and 6.68 (95% CI:5.4,8.11) months,respectively.Conclusion:Gemcitabine as single agent applied in this special population was effective and can be well tolerated under different doses and usage. 展开更多
关键词 ELDERLY non-small cell lung cancer (NSCLC) pooled-analysis GEMCITABINE first line setting
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Research on Architecture of Campus Mobile Library System based on Cloud Computing
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作者 Yingpei Wang 《International Journal of Technology Management》 2013年第1期109-111,共3页
Through analysis of cloud computing and characteristics, the paper described cloud computing infrastructure architecture. Mainly discusses cloud computing advantages in the use of the library and the use should pay at... Through analysis of cloud computing and characteristics, the paper described cloud computing infrastructure architecture. Mainly discusses cloud computing advantages in the use of the library and the use should pay attention to the problem, on this basis, we propose a cloud- based library information platform construction model to analyze the basic architecture of cloud computing, cloud-depth study calculated at the library information platform and database access patterns operating mode, and cloud computing future development and application prospects. 展开更多
关键词 cloud computing mobile library information platform
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Meteorological Data Generation for the Numerical Simulation of Stratified Flow in the Joumine Reservoir, Tunisia
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作者 Tadaharu Ishikawa Kakeru Takahira +1 位作者 Mingyang Wang Mitsuteru Irie 《Journal of Environmental Science and Engineering(B)》 2014年第4期173-180,共8页
Dynamic numerical simulation of water conditions is useful for reservoir management. In remote semi-arid areas, however, meteorological and hydrological time-series data needed for computation are not frequently measu... Dynamic numerical simulation of water conditions is useful for reservoir management. In remote semi-arid areas, however, meteorological and hydrological time-series data needed for computation are not frequently measured and must be obtained using other information. This paper presents a case study of data generation for the computation of thermal conditions in the Joumine Reservoir, Tunisia. Data from the Wind Finder web site and daily sunshine duration at the nearest weather stations were utilized to generate cloud cover and solar radiation data based on meteorological correlations obtained in Japan, which is located at the same latitude as Tunisia. A time series of inflow water temperature was estimated from air temperature using a numerical filter expressed as a linear second-order differential equation. A numerical simulation using a vertical 2-D (two-dimensional) turbulent flow model for a stratified water body with generated data successfully reproduced seasonal thermal conditions in the reservoir, which were monitored using a thermistor chain. 展开更多
关键词 Meteorological data generation numerical simulation thermal stratification reservoir management.
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浅谈顺德区公众交通信息服务系统 被引量:1
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作者 罗超 李志彪 《广东公安科技》 2015年第2期33-36,51,共5页
本文主要结合顺德当前交通实际,对公众交通信息服务的需求进行详细分析,并就如何在顺德智能交通建设基础上实施公众交通信息服务系统提出建设思路,以满足公众出行的服务需要,切实提高顺德交警的公众服务能力和水平。
关键词 智能交通 公众交通信息 交通综合数据库 网络安全边界交换平台
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Traditional Chinese Medicine for the treatment of influenza: a systematic review and Meta-analysis of randomized controlled trials 被引量:5
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作者 Chunya Wang Hao Wang +3 位作者 Xinying Liu Dongping Xu Yiping Tang Ping Luo 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2014年第5期527-531,共5页
OBJECTIVE: To justify the clinical use of Traditional Chinese Medicine(TCM) in the treatment of influenza.METHODS: MEDLINE, EMBASE, Chinese Biomedical Literature Database, China National Knowledge Infrastructure Datab... OBJECTIVE: To justify the clinical use of Traditional Chinese Medicine(TCM) in the treatment of influenza.METHODS: MEDLINE, EMBASE, Chinese Biomedical Literature Database, China National Knowledge Infrastructure Database, China Science and Technology Journal Database, Wanfang Database and the Cochrane Database of Systematic Reviews were searched from thedate of inception until January 1,2013, for the literature on treatment of influenza with TCM.RESULTS: A total of 7 randomized controlled trials were identified and reviewed. Of these trials, 2 compared a(modified) prescription of TCM with oseltamivir and 5 compared a patent traditional Chinese drug with oseltamivir. Based on the Meta-analysis,compared to oseltamivir, the(modified) prescription had similar effect in defervescence [WMD=5.66, 95% CI(﹣32.02, 43.35), P=0.77] and viral shedding [WMD=﹣ 6.21, 95% CI(﹣84.19, 71.76), P=0.88], and the patent traditional Chinese drug also had similar effect in viral shedding [WMD=﹣ 0.24,95% CI(﹣4.79, 4.31), P=0.92] but more effective in defervescence [WMD=﹣4.65, 95%CI(﹣8.91, ﹣0.38),P=0.03].CONCLUSION: TCM has potential positive effects in the treatment of influenza. 展开更多
关键词 Influenza human Medicine ChineseTraditional OSELTAMIVIR Systematic review Ran-domized controlled trials
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Status and strategies analysis on international standardization of auricular acupuncture points
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作者 Lei Wang Baixiao Zhao Liqun Zhou 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2013年第3期408-412,共5页
OBJECTIVE: To supply literature for developing an international standard of auricular acupuncture points. METHODS: Electronic database searches were con- ducted in the Chinese National Knowledge Infra- structure and... OBJECTIVE: To supply literature for developing an international standard of auricular acupuncture points. METHODS: Electronic database searches were con- ducted in the Chinese National Knowledge Infra- structure and VlP, and the Western databases, Pubmed, the National Science and Technology Li- brary, and the German Journal of Acupuncture, from 1990 to April, 2012. We also searched the doc- uments of international symposiums for auricular acupuncture points (AAPs). Keywords were "auricu- lar points", "auricular acupuncture points", "ear points", or "auriculotherapy" RESULTS: Basic and clinical research on AAPs was performed in China, the United States, France, andGermany. Clinical AAP research was done in Italy, Austria, Switzerland, Spain, the UK, Holland, Japan, Russia, and Africa. However, AAP research was not communicated internationally. The World Federa- tion of Acupuncture-Moxibustion Societies recom- mended international standard of auricular acu- puncture points (ISAAPs). Standardized nomencla- ture and locations of AAPs would provide a solid basis to draft an international standard organiza- tion. CONCLUSION: Experts need to find common points from different countries or regions, provide evidence of different ideas, and list the proposal as a recommendation for an international standard. 展开更多
关键词 Acupuncture ear Reference standards Information storage and retrieval
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