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Search Results: 1 - 10 of 296546 matches for " <br>于洪 "
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Generalizing rough set theory based on constructive method

YU Hong,<br>
重庆邮电大学学报(自然科学版) , 2009,
Abstract: The generalization of the rough set theory was reviewed from the angle of constructive method. First the basic ideas and framework of the rough set theory and the different views of knowledge representation in rough set theory were introduced, and then the upper and lower approximate operators definitions were discussed respectively in view of element based, granular based, subsystem based, and probability. Furthermore, the recent studies for the generalization of the theory and the future development trend of the rough set theory were studied.
On Tactics for Planning Strategy of Periodical Culture

YU HongFei,<br>
中国科技期刊研究 , 2006,
Abstract: 阐述了期刊文化策划的理论依据和主体内容,提出了期刊文化策划的应对策略:建立期刊文化策划的理念,构筑具有中国特色的期刊文化体系;实践以人为本原则,构建人性化的期刊管理制度;建立学习型团队,形成高效务实的文化组织,增加期刊社的凝聚力和向心力;树立良好的期刊文化形象,打造品牌期刊和名牌期刊.

Yu Hongjun,<br>
第四纪研究 , 1999,
Abstract: Since the 1990s, a series of progresses have been made in the research of both exposed and buried loess layers in the shelf area of the Eastern China Seas. Records of sub-bottom profiling of thousands of kilometers have further verified the existence of buried loess layers and aeolian dunes. As a matter of fact there are many paleo-dunes and loess layers in the coastal zone of the Bobal Sea, and there are a series of buried loess layers and dunes in the shelf area of the Eastern China Seas. Basedon these facts, it can be deduced that the loess in the shelf area was not transpededfrom the west part of the mainland of China. Instead, it was mainly formed in situ, i.e., just from the shelf area itself.This is the "proximal theory of loess origin".During the maximum of the last glacial period, the sea level of the EasternChina Seas was lowered with great magnitude. The coastline of Eastern China Seasthen was located approximately along the present 130m isobath in the outer shelfzone of the East China Sea. As a result the Bobal Sea and Yellow Sea as a wholeand most part of the East China Sea were exposed to form a part of the Asianmainland. The area of the exposed shelf plains was over 1 000 000 km2. The wintermonsoon then was obviously strengthened, hence the cold and dry air currents fromthe west could spread to the exposed shelf plains. The deflation of storm winds notonly accelerated the development of inland desert-loess systems, but also led to thedevelopment of desert-loess deposition systems in the exposed shelf plains. Manyresearchers have found that the desert-loess deposition sequences in the shelf areascontain the fossils of foraminifera and radiolaria and glauconite, and consist of coarseparticles. These characteristics indicated that the loess material in the shelf plains didnot come from the west inland desert area. Most part of the loess deposit, consistingmainly of silt and silty clay, was proximal deposit and only the very fine-graineddust can be transported intcrcontinentally in the upper air currents.In the coastal zone of the Bobal Sea, the desert-derived loess deposit is mainlydistributed in the west and northwest parts of Liaodong Peninsula, the islands in theBobal Strait, and the north part of Shandong Peninsula (from Penglai to Lingezhuang) in the pattern parallel to the coasts. The loess platform in Xiazhupan-Lingezhuang-Pozi in the north part of Shandong Peninsula forms a straightly steepcliff along the coast, which is the unique loess coast in China.A series of geological drillings in the Bobal Sea have revealed that there is athick sand layer beneath the Holocene transgression sequence in the desertifled areas.The development of the deserts in the exposed shelf plains can be divided into tWophases f the expansion phase and the contraction phase. During the desert expansionphase, a thick sand layer formed in the 15-29m warer-depth zone from the west tothe east of the Bobal Sea as revealed by geological drillings. The desert
Controlling chaos using time-delay nonlinear feedback

Yu Hong-Jie,<br>
物理学报 , 2005,
Abstract: A method of chaos control using time-delay nonlinear feedback based on stability criterion is proposed. By a suitable separation of the chaotic system, a special nonlinear function is obtained. We use the difference of nonlinear functions of the chaotic output signal and its delayed output signal to construct a continuous feedback input perturbation. The method can stabilize chaotic systems to a desired periodic orbit without using any external force. The method retains the advantages of performing the self-control via delayed feedback control method. Besides, the validity of control is ensured due to the stability criterion. The control can be started at any moment, and it is convenient and flexible. The coupled Duffing oscillator is given as numerical examples. The results of numerical simulation show the validity of the method.

Yu Qing,Hong Jiazhen,<br>,嘉振
力学学报 , 1998,
Abstract: A new method is developed to correct the violations in constraint multibody systems. Compared with any conventional methods, this method has clear physical meaning, less calculation and obvious correction effect. Besides, this method has little influence on the quality of the original dynamic equations. Using this method, the violations of constraint equations can be limited efficiently in the given accuracy. Suggest that the integration is at the step t=t k , and the generalized coordinates k do not...
A hierarchical search results clustering method based on K-Means

YU Hong,SHEN Qiang,<br>,谌强
重庆邮电大学学报(自然科学版) , 2010,
Abstract: Against the difficulties of users in the search results list, a hierarchical search results clustering method based on K-Means was proposed based on the analysis of the features of web search results. The browsability of the search results was greatly improved by providing users with category labels of search results for the classification display. Besides, a prototype clustering search results system was designed and implemented based on this method. The experiment results show that the new method is feasible.
An average degree clustering algorithm in mobile ad hoc network

SU Xiao,YU Hong,<br>苏晓,
重庆邮电大学学报(自然科学版) , 2010,
Abstract: In this paper, a clustering algorithm for mobile ad hoc network (MANET) named average degree clustering algorithm (ADCA) was presented. The proposed algorithm overcomes the shortcoming of those typical clustering algorithms which can easily bring in communication bottleneck. In order to balance the burden of nodes, those nodes which have proper degree were elected as cluster heads. The proposed ADCA was simulated by Glomosim, and the experimental result shows that the novel algorithm is good at maintaining the stability of net structure.
Collaborative filtering filling miss values algorithm based on co-rating matrix

CHEN Yi,YU Hong,<br>陈逸,
计算机应用研究 , 2009,
Abstract: In order to solve the sparsity of ratings problem in collaborative filtering, this paper proposed a new filling miss va-lues algorithm. Firstly, defined the co-rating matrix. Secondly, proposed a filling miss values algorithm based on the co-rating matrix, which worked well through the change of the similarity relation on the co-rating matrix. Experimental results show that the algorithm can effectively solve the data sparse problem and improve the quality of the recommendation.

煤炭工程 , 2011,
Abstract: 针对如何解决高瓦斯煤层采掘过程中瓦斯超限的问题,提出了高压水射流割缝提高穿层钻孔瓦斯抽放效果的技术。文章分析了高压水射流割缝对瓦斯的作用机理,介绍了高压水射流割缝系统设备、工艺以及现场试验情况。通过对钻孔进行高压水射流割缝,从而增加了钻孔的煤层暴露面积以及卸压范围,钻孔瓦斯抽放量提高了2倍以上,瓦斯抽放效果有了显著的提高。

煤炭工程 , 2010,
Abstract: 为了解决综采工作面液压支架在井下组装困难的问题,文章运用工业工程的流程程序分析方法对支架组装流程进行了优化,采取“5W1H”对加工、检验、搬运、储存、等待五项活动进行提问和思考,找出原有组装流程存在的问题,运用ECRS的原则对流程进行优化改进。实践表明优化后的组装流程大大提高了支架组装效率,保证了综采工作面安装的顺利完成,从而保证了工作面的正常接替。
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