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Fuzzy interval linguistic sets with applications in multi-attribute group decision making 被引量:1
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作者 LUO Xiao LI Weimin +1 位作者 WANG Xuanzi ZHAO Zhenchong 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2018年第6期1237-1250,共14页
Uncertain and hesitant information, widely existing in the real-world qualitative decision making problems, brings great challenges to decision makers. Hesitant fuzzy linguistic term sets(HFLTSs), an effective linguis... Uncertain and hesitant information, widely existing in the real-world qualitative decision making problems, brings great challenges to decision makers. Hesitant fuzzy linguistic term sets(HFLTSs), an effective linguistic computational tool in modeling and eliciting such information, have hence aroused many scholars’ interests and some extensions have been introduced recently.However, these methods are based on the discrete linguistic term framework with the limited expression domain, which actually depict qualitative information using several single values. Therefore,it is hard to ensure the integrity of the semantics representation and the accuracy of the computation results. To deal with this problem, a semantics basis framework called complete linguistic term set(CLTS) is designed, which adopts a separation structure of linguistic scale and expression domain, enriching semantics representation of decision makers. On this basis the concept of fuzzy interval linguistic sets(FILSs) is put forward that employs the interval linguistic term with probability to increase the flexibility of eliciting and representing uncertain and hesitant qualitative information. For practical applications, a fuzzy interval linguistic technique for order preference by similarity to ideal solution(FILTOPSIS) method is developed to deal with multi-attribute group decision making(MAGDM) problems. Through the cases of movie and enterprise resource planning(ERP) system selection, the effectiveness and validity of the proposed method are illustrated. 展开更多
关键词 hesitant fuzzy sets multi-attribute group decision making(MAGDM) fuzzy interval linguistic set(FILS) hesitant fuzzy linguistic term set(HFLTS) fuzzy linguistic approach
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Half-global discretization algorithm based on rough set theory 被引量:2
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作者 Tan Xu Chen Yingwu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2009年第2期339-347,共9页
It is being widely studied how to extract knowledge from a decision table based on rough set theory. The novel problem is how to discretize a decision table having continuous attribute. In order to obtain more reasona... It is being widely studied how to extract knowledge from a decision table based on rough set theory. The novel problem is how to discretize a decision table having continuous attribute. In order to obtain more reasonable discretization results, a discretization algorithm is proposed, which arranges half-global discretization based on the correlational coefficient of each continuous attribute while considering the uniqueness of rough set theory. When choosing heuristic information, stability is combined with rough entropy. In terms of stability, the possibility of classifying objects belonging to certain sub-interval of a given attribute into neighbor sub-intervals is minimized. By doing this, rational discrete intervals can be determined. Rough entropy is employed to decide the optimal cut-points while guaranteeing the consistency of the decision table after discretization. Thought of this algorithm is elaborated through Iris data and then some experiments by comparing outcomes of four discritized datasets are also given, which are calculated by the proposed algorithm and four other typical algorithras for discritization respectively. After that, classification rules are deduced and summarized through rough set based classifiers. Results show that the proposed discretization algorithm is able to generate optimal classification accuracy while minimizing the number of discrete intervals. It displays superiority especially when dealing with a decision table having a large attribute number. 展开更多
关键词 half-global discretization continuous condition attributes correlation coefficient rough entropy STABILitY rough set theory
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Research on knowledge acquisition method about the IF/THEN rules based on rough set theory 被引量:2
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作者 Liu Daohua Yuan Sicong +1 位作者 Zhang Xiaolong Wang Fazhan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2008年第3期628-634,F0003,共8页
The basic principles of IF/THEN rules in rough set theory are analyzed first, and then the automatic process of knowledge acquisition is given. The numerical data is qualitatively processed by the classification of me... The basic principles of IF/THEN rules in rough set theory are analyzed first, and then the automatic process of knowledge acquisition is given. The numerical data is qualitatively processed by the classification of membership functions and membership degrees to get the normative decision table. The regular method of relations and the reduction algorithm of attributes are studied. The reduced relations are presented by the multi-representvalue method and its algorithm is offered. The whole knowledge acquisition process has high degree of automation and the extracted knowledge is true and reliable. 展开更多
关键词 rough set theory knowledge's automatic gain IF/theN rule attribute reduction multi-dimensionalrepresentative value.
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基于BlendMask与改进Super4PCS的物体位姿估计方法
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作者 郑银环 张帅彬 +1 位作者 吴飞 陈恩杰 《合肥工业大学学报(自然科学版)》 北大核心 2025年第1期10-18,58,共10页
针对工业上常见的散乱堆叠工件的位姿估计和无序分拣问题,文章提出一种基于BlendMask实例分割算法与改进Super 4PCS(super 4-points congruent sets)点云配准算法的物体位姿估计方法。利用BlendMask实例分割算法分割目标工件并构建工件... 针对工业上常见的散乱堆叠工件的位姿估计和无序分拣问题,文章提出一种基于BlendMask实例分割算法与改进Super 4PCS(super 4-points congruent sets)点云配准算法的物体位姿估计方法。利用BlendMask实例分割算法分割目标工件并构建工件表面点云;定义抓取分数选择最上层工件作为抓取对象,实现机器人自上而下抓取;针对不同形状的目标工件,基于相似匹配度函数选择模板点云;融合Super 4PCS与正态分布转换(normal distributions transform,NDT)算法完成目标点云和模板点云在低重合率情况下的精确配准,获取目标工件的抓取位姿;并针对Super 4PCS算法粗配准时速度较慢的问题,通过对体素滤波后的目标点云和模板点云提取3D内部形状描述子(intrinsic shape signatures,ISS)作为点云配准算法的输入点集来提高算法的配准速度。点云配准实验和机器人无序分拣实验结果表明,文章提出的物体位姿估计方法可以快速、准确地完成目标工件的位姿估计和无序分拣任务,配准算法均方根误差(root mean square error,RMSE)小于3.8 mm,位姿估计所需时间小于5.8 s,性能满足实际应用要求。 展开更多
关键词 散乱堆叠工件 位姿估计 无序分拣 BlendMask实例分割算法 Super 4PCS算法 点云配准
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基于改进SEWM-CRITIC博弈集成云的城市燃气PE管道风险评价方法
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作者 张鹏 刘为 +3 位作者 沈豪 肖博文 宋文琦 刘思铭 《安全与环境工程》 北大核心 2025年第2期116-123,132,共9页
为解决城市燃气PE管道的安全评估问题,提出一种基于博弈集成云模型的管道风险评价法。以西南某地区城市燃气PE管道为研究对象,通过全息直觉模糊集(HHM-IFS)选取并筛选了5项一级指标,22项二级指标;利用基于博弈论主客观权衡改进的结构熵... 为解决城市燃气PE管道的安全评估问题,提出一种基于博弈集成云模型的管道风险评价法。以西南某地区城市燃气PE管道为研究对象,通过全息直觉模糊集(HHM-IFS)选取并筛选了5项一级指标,22项二级指标;利用基于博弈论主客观权衡改进的结构熵权(SEWM)法与基于指标相关性的权重赋权系数(CRITIC)法,以云理论为基础构建了充分考虑模糊性与随机性的博弈集成云模型,并确定了管道风险等级。结果表明,该区燃气管道为中等风险等级,应该重点关注回填质量、自然灾害、钢塑接头腐蚀、运行误操作、地形以及生物侵蚀等风险薄弱项。分析结果与实际工程相吻合,证明了该方法是一种科学合理的评估方法,为更有效地评估城市燃气PE管道的安全状态提供了新途径。 展开更多
关键词 城市燃气PE管道 风险评价 博弈论 集成云模型 全息直觉模糊集(HHM-IFS)
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Condition Monitoring and Fault Diagnosis Based on Rough Set Theory 被引量:1
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作者 Li Xiong Li Shengli Xu Zongchang 《仪器仪表学报》 EI CAS CSCD 北大核心 2005年第z1期781-783,共3页
In order to raise the efficiency,automatization and intelligentization of condition monitoring and fault diagnosis for complex equipment systems,rough set theory is used to the field. A feature reduction algorithm bas... In order to raise the efficiency,automatization and intelligentization of condition monitoring and fault diagnosis for complex equipment systems,rough set theory is used to the field. A feature reduction algorithm based on rough set theory is adopted to extract condition information in monitoring and diagnosis for an engine,so that the technology condition monitoring parameters are optimized. The decision tables for each fault source are built and the diagnosis rules rooting in rough set reduction is applied to carry through intelligent fault diagnosis. The cases studied show that rough set method in condition monitoring and fault diagnosis can lighten the work burden in feature selection and afford advantages for autonomic learning and decision during diagnosis. 展开更多
关键词 CONDitION monitoring FAULT diagnosis ROUGH set theory ENGINE
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重离子导致的SOI SiGe HBT的SET效应数值模拟研究
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作者 李府唐 郭刚 +4 位作者 张峥 孙浩瀚 刘翠翠 史慧琳 欧阳晓平 《半导体技术》 北大核心 2025年第7期714-722,共9页
锗硅异质结双极晶体管(SiGe HBT)具有优异的低温性能以及抗总剂量效应和位移损伤的能力,但是其对单粒子效应(SEE)较敏感。利用计算机辅助设计技术(TCAD)构建了SiGe HBT模型,研究了衬底类型、重离子入射位置、器件温度和重离子线性能量转... 锗硅异质结双极晶体管(SiGe HBT)具有优异的低温性能以及抗总剂量效应和位移损伤的能力,但是其对单粒子效应(SEE)较敏感。利用计算机辅助设计技术(TCAD)构建了SiGe HBT模型,研究了衬底类型、重离子入射位置、器件温度和重离子线性能量转移(LET)值对SiGe HBT单粒子瞬态(SET)效应的影响。研究结果表明,集电极/衬底结及其附近是器件的SET效应敏感区域,绝缘体上硅(SOI)工艺的引入有助于提高SiGe HBT的抗SEE能力。此外,载流子迁移率与自由载流子浓度是影响器件SET温度依赖性的最主要因素,随着温度进一步降低至极端低温,杂质不完全电离的影响也愈发凸显。随着LET值升高,SOI SiGe HBT的SET效应显著增强。尤其在低温与高LET耦合作用下,器件的SET电流峰值和电荷收集量远超在其他辐照条件下的。 展开更多
关键词 锗硅异质结双极晶体管(SiGe HBT) 绝缘体上硅(SOI)工艺 单粒子瞬态(set) 单粒子效应(SEE) 计算机辅助设计技术(TCAD)
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基于SET/AHP/FBS的失能老人移位辅具设计
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作者 郑智雄 唐德红 谢敏 《包装工程》 北大核心 2025年第16期114-123,共10页
目的为解决失能老人居家移位问题,提高其生活质量。方法构建了基于SET-AHP-FBS的设计策略。首先,通过SET分析法对用户需求进行调研分析,找到产品的设计缺口;其次,运用AHP确定需求权重并使用模糊综合评价法验证层次模型的合理性;再次,将... 目的为解决失能老人居家移位问题,提高其生活质量。方法构建了基于SET-AHP-FBS的设计策略。首先,通过SET分析法对用户需求进行调研分析,找到产品的设计缺口;其次,运用AHP确定需求权重并使用模糊综合评价法验证层次模型的合理性;再次,将用户需求分别转化为产品功能;最后,依据FBS模型,实现产品由功能、行为到结构的映射,从而确定产品各结构模块,输出设计方案。结果基于SET-AHP-FBS的设计策略具有可行性,该策略客观上使得用户需求与产品功能之间形成精准有效的映射关系,并且减少了设计过程中因主观因素而造成的影响。结论能够较为全面的解决失能老人在日常生活中遇到的移位、如厕等一系列问题,同时有效地改善了现有产品常未能准确把握用户核心需求的问题,也为同类产品研究提供了新的设计思路。 展开更多
关键词 产品设计 移位辅具设计 set AHP FBS
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AN INTRACONTINENTAL EXTENSIONAL TECTONIC SETTING FOR THE ORIGIN OF YULONG PORPHYRY COPPER DEPOSIT IN EAST TIBET
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作者 Wang Gaoming, Wang Mingjie 《地学前缘》 EI CAS CSCD 2000年第S1期402-402,共1页
The plate tectonic model constructed by R.H. Sillitoe for the origin of porphyry copper deposits said that porphyry copper deposits were associated with convergent plate boundaries and compressional tectonic settings.... The plate tectonic model constructed by R.H. Sillitoe for the origin of porphyry copper deposits said that porphyry copper deposits were associated with convergent plate boundaries and compressional tectonic settings. They were formed along destructive plate margins above subduction zones of oceanic crust. Although this model is suitable for most porphyry copper deposits because the main porphyry copper deposit belts accord with the main Mesozoic or Cenozoic plate subduction zones in space and time in the world, it is difficult to use Sillitoe’s model for explaining the formation of some intracontinental porphyry deposits such as Yulong, the largest one in East Tibet.Having no relation with a subduction zone of plates, Yulong porphyry copper deposit was formed in an intracontinental extensional tectonic setting. Qamdo block, in which Yulong lies, was a small massif in East Tibet. With its Proterozoic crystalline basement and Lower Paleozoic folded basement, Qamdo block had experienced relative stable geologic evolution and a cover more than 20000m in thickness mainly composed of clastic rock and carbonate formed from Devonian to Cretaceous. During this time, although two small oceanic basins(Jinshajiang basin and Lancangjiang basin) between which Qamdo block lay developed and subducted and relevant island arc belts occured along the east and west margins of the block, all of them were closed before Later Triassic. In Cenozoic, mainly from 52 to 35Ma, influenced by the intracontinental convergence of the three large plates(India to the southwest, Tarim to the northwest,and Yangtze to the east), Qamdo block and its surrounding areas (East Tibet) which were just to the west of Yangtze plate were in an intracontinental pull\|apart situation induced by the sinistral strike\|slip fault system while most Himalaya—Kunlun—Tibet areas between India and Tarim plates were in a compression state by the SN\|trending tectonic stress. Controlled by the regional strike\|slip fault systems, the calc\|alkaline magma deriving from the upper mantle or lower crust ascended, occurring porphyry copper mineralization in the relative uplift areas. At the same time, in the relative depression areas, also controlled by the regional deep strike\|slip faults which might cut the lithosphere, several linear or rhombic pull\|apart red molasse basins such as Gongjoe, Nangqen, parallel to the porphyry belt, were formed in this region. 展开更多
关键词 intracontinental TECTONIC setTING PORPHYRY copper DEPOSit Y ulong TIBET
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An Improved Mumford-Shah Model and Its Applications to Image Processing with the Piecewise Constant Level Set Method 被引量:1
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作者 SONG Jin-Ping LI Shuai-Jie 《自动化学报》 EI CSCD 北大核心 2007年第12期1259-1262,共4页
为快分割并且降噪,提高 penalization 学期的古典 Mumford-Shah (MS ) 模型需要,即增加 penalization 参数,它导致目标的渐渐的消失。在这份报纸,我们建议一个改进 Mumford-Shah (IMS ) 模型避免现象,并且采用 piecewise 常数水平... 为快分割并且降噪,提高 penalization 学期的古典 Mumford-Shah (MS ) 模型需要,即增加 penalization 参数,它导致目标的渐渐的消失。在这份报纸,我们建议一个改进 Mumford-Shah (IMS ) 模型避免现象,并且采用 piecewise 常数水平集合方法(PCLSM ) 和坡度降下方法解决最小化问题。数字实验被给显示出新模型和算法的效率和优点。 展开更多
关键词 分段持续水平集方法 分割 降噪 经典MS模型 最小化 算法
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Review of Marxist Political Party Theory Innovation Over the 70 Years Since the Establishment of PRC
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作者 Meng Pengfei 《学术界》 CSSCI 北大核心 2019年第11期215-224,共10页
since the establishment of the People’s Republic of China,the central leader-groups from generation to generation have been continuously exploring and innovating Marxist political party theory in terms of its value t... since the establishment of the People’s Republic of China,the central leader-groups from generation to generation have been continuously exploring and innovating Marxist political party theory in terms of its value target,ideological construction,working style,and organization developments.This process can be categorized into five stages:the founding stage in Mao Zedong’s era,the development stage in Deng Xiaoping’s ear,the promotion stage in Jiang Zemin’s times,the deepening stage under Hu Jintao’s leadership,and the stage of further innovation by Xi Jinping in the new era,with the characteristics of inheritance,development as well as scientificity and valuation. 展开更多
关键词 70years SINCE the ESTABLISHMENT of New China MARXIST POLitICAL PARTY theory progress characteristics
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Rough similarity degree and rough close degree in rough fuzzy sets and the applications
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作者 Li Jian Xu Xiaojing Shi Kaiquan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2008年第5期945-951,共7页
Based on rough similarity degree of rough sets and close degree of fuzzy sets, the definitions of rough similarity degree and rough close degree of rough fuzzy sets are given, which can be used to measure the similar ... Based on rough similarity degree of rough sets and close degree of fuzzy sets, the definitions of rough similarity degree and rough close degree of rough fuzzy sets are given, which can be used to measure the similar degree between two rough fuzzy sets. The properties and theorems are listed. Using the two new measures, the method of clustering in the rough fuzzy system can be obtained. After clustering, the new fuzzy sample can be recognized by the principle of maximal similarity degree. 展开更多
关键词 rough fuzzy set rough similarity degree rough close degree CLUSTERING recognition of rough pattern maximal similarity degree principle.
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A Dual-mode Nonlinear Model Predictive Control with the Enlarged Terminal Constraint Sets 被引量:16
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作者 ZOU Tao LI Shao-Yuao DING Bao-Cang 《自动化学报》 EI CSCD 北大核心 2006年第1期21-27,共7页
Aiming at a class of nonlinear systems with multiple equilibrium points, we present a dual-mode model predictive control algorithm with extended terminal constraint set combined with control invariant set and gain sch... Aiming at a class of nonlinear systems with multiple equilibrium points, we present a dual-mode model predictive control algorithm with extended terminal constraint set combined with control invariant set and gain schedule. Local LQR control laws and the corresponding maximum control invariant sets can be designed for finite equilibrium points. It is guaranteed that control invariant sets are overlapped each other. The union of the control invariant sets is treated as the terminal constraint set of predictive control. The feasibility and stability of the novel dual-mode model predictive control are investigated with both variable and fixed horizon. Because of the introduction of extended terminal constrained set, the feasibility of optimization can be guaranteed with short prediction horizon. In this way, the size of the optimization problem is reduced so it is computationally efficient. Finally, a simulation example illustrating the algorithm is presented. 展开更多
关键词 不变量集 非线性模型 预先控制 非线性约束系统 增益表
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Study on the Yield Reduction Mechanism of Soybean Planted under Continuous and every Second Year Cropping Conditions 被引量:3
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作者 ZuWei LiuZhongtang 《Journal of Northeast Agricultural University(English Edition)》 CAS 1998年第2期81-95,共15页
Three-year investigation was conducted to demonstrate the mechanism of reduction of soybean yield aroused by continuous and every second year cropping. Compared to normal cropping, there are many unfavorable changes i... Three-year investigation was conducted to demonstrate the mechanism of reduction of soybean yield aroused by continuous and every second year cropping. Compared to normal cropping, there are many unfavorable changes in some major elements of soybean plant and soil environment. Chloropyll content was lower. Phosphorous content of soybean plant was decreased seriously. Potassium content was lower while calcium content was higher. Magnesium content was wot affected and decreased in susceptive varieties. Some deseases and insects of soybean under continuous and wery second year cropping conditions became serious as continuous years prolonged. Organic matter content tended to go down from normal rotation to continuous cropping. Amount of bacteria and antinomyces decreased while amount of fungi increased. The development of symbiotic nitrogen fixation system wsa deteriorated. 展开更多
关键词 yield reduction mechanism SOYBEAN continous and every second year cropping condition
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The Discussion of Setting up Accounting First Level Discipline
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作者 Cao Wei 《财会通讯(上)》 北大核心 2015年第1期4-4,共1页
Such disciplines as financial management,auditing,separated from the accounting diseipline system,have hecome anindependent professional,These two disciplines together with the original accounting diseipline,are liste... Such disciplines as financial management,auditing,separated from the accounting diseipline system,have hecome anindependent professional,These two disciplines together with the original accounting diseipline,are listed in business administration firstlevel discipline in the category of management,as the secondary discipline or professional.This paper argues that requirements are met now toset up the first level discipline of accounting professional(or class),and the three secondary discipline(or major):the accounting,financialmanagement,auditing,should be included into accounting first level discipline(or classes).Then,accounting will become first level disciplineparalleling with business administration first level. 展开更多
关键词 ACCOUNTING Subject setting First level subject
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Pore-scale simulation of coupled reactive transport and dissolution in fractures and porous media using the level set interface tracking method 被引量:1
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作者 Huang Hai Li Xiao-Yi 《南京大学学报(自然科学版)》 CAS CSCD 北大核心 2011年第3期235-251,共17页
关键词 英文摘要 内容介绍 编辑工作 期刊
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OBSERVING THE ENTIRE GLOBE FOR THE GOOD OF THE MANKIND——China takes an Active Part in Activities of the“International Space Year”
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作者 Chen Shupeng 《遥感信息》 CSCD 1990年第A02期2-2,共1页
The experience of the mankind in studying the planet of our own, is long and the progress is accelerated. From the numerous geographic adventures organized in the past thousand years came only the brief knowledge of t... The experience of the mankind in studying the planet of our own, is long and the progress is accelerated. From the numerous geographic adventures organized in the past thousand years came only the brief knowledge of the outline of the land and ocean; with the scientific explorations and topographic mapping activities done in the 300-plus years that followed, only about 30% of the land got mapped. But things have been changed greatly since the beginning of the century, when the air planes were put into use for mapping: up to 1950’s, the mapped areas had gone up to 70%; From 1957, a series of resource and environment satellites have been launched one after another,observing the globe, giving coverage of it and providing endlessly varieties of information about the seas and the lands day and night. 展开更多
关键词 China takes an Active Part in Activities of the International Space year OBSERVING the ENTIRE GLOBE FOR the GOOD OF the MANKIND
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The Particularity of the Development of Labor Relationship in the 70-Year History of the People’s Republic of China
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作者 Liu Dawei 《学术界》 CSSCI 北大核心 2019年第11期207-214,共8页
The past seven decades witnesses a stage marked by"ossification-consolidation-emptiness"as regards domestic labor relationship.It is highly probable that China is to be inaugurated by the stage of"falsi... The past seven decades witnesses a stage marked by"ossification-consolidation-emptiness"as regards domestic labor relationship.It is highly probable that China is to be inaugurated by the stage of"falsification"in forthcoming days.A major cause is rooted in that labor relationship is the output of economic development that would request that labor relationship chime with it.The development course of labor relationship since the founding of PRC explicitly evinces that"flexibility"might be incurred in case labor relationship fails to align with economic development and with demands of marketing competitiveness.It might even propel main bodies of labor relationship to circumvent labor laws,as is verified by prevalence of large-scaled labor dispatching,and of"labor dispatching under the disguise of outsourcing".Lawmakers thus need to further ruminate over degree of tolerance on labor legislation. 展开更多
关键词 70-year history LABOR relationship flexible EMPLOYMENT
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人工智能高质量数据集的发展趋势及热点--基于CiteSpace的知识图谱分析 被引量:1
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作者 王鹏 程思儒 《技术经济与管理研究》 北大核心 2025年第4期43-48,共6页
近些年来,人工智能快速发展,人工智能技术迅速进步,深入人们生活的方方面面,需要加快构建高质量数据集。基于CiteSpace的知识图谱分析,系统梳理了我国人工智能高质量数据集的研究趋势和热点方向。研究表明,人工智能高质量数据集在多样... 近些年来,人工智能快速发展,人工智能技术迅速进步,深入人们生活的方方面面,需要加快构建高质量数据集。基于CiteSpace的知识图谱分析,系统梳理了我国人工智能高质量数据集的研究趋势和热点方向。研究表明,人工智能高质量数据集在多样性、针对性和规模上具有显著优势,并广泛应用于医疗健康、自动驾驶和智能制造等领域。此外,政策支持、数据驱动和深度学习技术创新成为研究的核心方向。从理论和实践层面对人工智能高质量数据集的发展提出了展望,为未来研究提供了参考。 展开更多
关键词 人工智能 高质量数据集 数据驱动 智能制造 深度学习 大数据
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Posit浮点部件实现
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作者 陈子钰 何军 +4 位作者 尹飞 颜世云 杨剑新 文周旺 马启皓 《计算机应用》 北大核心 2025年第S1期163-169,共7页
首先,介绍Posit浮点格式及相关研究现状;其次,设计并实现一组Posit浮点运算指令,包含7条算术运算指令、3条比较指令和14条格式转换指令;最后,实现一个能全流水执行的Posit浮点部件,并评估它的实现性。该部件支持Posit(32,2)、Posit(32,3... 首先,介绍Posit浮点格式及相关研究现状;其次,设计并实现一组Posit浮点运算指令,包含7条算术运算指令、3条比较指令和14条格式转换指令;最后,实现一个能全流水执行的Posit浮点部件,并评估它的实现性。该部件支持Posit(32,2)、Posit(32,3)和Posit(32,6)这3种格式,包含5级流水的Posit浮点融合乘加(PFMA)子部件和3级流水的Posit浮点格式转换(PFCVT)子部件。相较于支持FP32格式的浮点部件,所提Posit浮点部件在Posit(32,2)格式下的操作数尾数和结果尾数的最大位宽增加了4 bit,并在Posit(32,6)格式下的指数的动态范围提升了近1 072 decades,显著提高了数据表示范围和灵活性;同时,在Posit(32,6)格式下支持的数据动态范围比FP64大了近524 decades。可见,所提部件可用于探索Posit(32,6)在特定领域和应用中替代FP64的可行性,以减少计算系统的存储、访存和通信开销,从而提高计算能效。 展开更多
关键词 Posit 浮点算术 融合乘加 浮点转换 指令集
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