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Current Medical Science 2020年第3期40卷 574-579页

作者： sheng-jun jianG zhong-zhi JIN You-jian PENG Department of Stomatology Renmin Hospital of Wuhan UniversityWuhan430060China

We previously reported that the increased expression of Dickkopf-related protein 1(DKK1)is positively related to vascular endothelial growth factor in the synovial fluid from patients with temporomandibular joint disorders(TMDs).DKK1 is involved in angiogenic activities in the TMD synovium in vitro,but the expression of DKK1 after treatment of TMD-osteoarthritis(TMD-OA)with hyaluronic acid(HA)remains *** this study,we assessed the expression of DKK1 in the synovial fluid of TMD-OA patients before and after treatment with HA via enzyme-linked immunosorbent *** also investigated the role of DKK1 in TMD-OA via immunohistochemical *** relationship between the expression of DKK1 and the clinicopathological characteristics was determined by Pearson *** results showed that the expression of DKK1 was significantly decreased after treatment with *** analyses indicated that the expression of DKK1 in the TMD-OA samples was closely correlated with mouth opening and *** findings suggest that DKK1 could play an important role in the pathogenesis and treatment of *** of the pain by HA treatment may be correlated with the decreased expression of DKK1.

关键词： Dickkopf-related protein 1 temporomandibular joint disorders hyaluronic acid synovial fluid

Environmental change in Bashang Region historical periods

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Journal of Environmental Sciences 2001年第2期13卷 224-227页

作者： sheng Xue-bin SUN jian-zhong LIU Yun-xia FENG jiang-bin Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Research Institute of Environmental Conservation Science of Beijing Beijing 100037China

The Bashang region is a typical vulnerable eco-environmental zone. Our analysis of paleodunes, paleosol profiles, and lake changes taking place during last ten thousands years indicated that: (1) 10 - 6.9 ka B. P. was a post-glacial temperature-increasing stage, in which lakes had their high water level; (2) 6.9 - 3.0 ka B. P. was a large warm stage, during which four paleosol layers were developed and climate fluctuation has assumed 4 - 5 small cold-humid and cold-dry alternations. Since 5.4 ka B. P, the lakes tended to gradually shrink; and by 2.1 ka B. P., water level has fallen by 2.7 m; (3) since 3.0 ka B. P. a general trend of the region was to change into a dry, warm-dry and cold-dry environment.

关键词： Bashang region environmental change

An efficient data layout scheme for better I/O balancing in RAID-6 storage systems

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Frontiers of Information Technology & Electronic Engineering 2015年第5期16卷 335-345页

作者： Ping XIE jian-zhong HUANG Er-wei DAI Qiang CAO Chang-sheng XIE Wuhan National Laboratory for Opto Electronics Huazhong University of Science & Technology Computer College Qinghai Normal University

Among redundant arrays of independent disks(RAID)-6 codes, maximum distance separable(MDS)based RAID-6 codes are popular because they have the optimal storage efficiency. Although vertical MDS codes exhibit better load balancing compared to horizontal MDS codes in partial stripes, an I/O unbalancing problem still exists in some vertical codes. To address this issue, we propose a novel efficient data layout, uniform P-code(UPC), to support highly balanced I/Os among P-coded disk arrays(i.e., PC). In UPC, the nonuniformly distributed information symbols in each parity chain of P-code are moved along their columns to other rows, thus enabling the parity chain to keep original parity relationships and tolerate double disk failures. The UPC scheme not only achieves optimal storage efficiency, computational complexity, and update complexity, but also supports better I/O balancing in the context of large-scale storage systems. We also conduct a performance study on reconstruction algorithms using an analytical model. Besides extensive theoretical analysis, comparative performance experiments are conducted by replaying real-world workloads under various configurations. Experimental results illustrate that our UPC scheme significantly outperforms the PC scheme in terms of average user response time. In particular, in the case of a 12-disk array, the UPC scheme can improve the access performance of the RAID-6 storage system by29.9% compared to the PC scheme.

关键词： RAID-6 Data availability High performance I/O balancing

Power Adjusting Algorithm： A New Cross-Layer Power Saving Mechanism for Mobile Ad-Hoc Networks

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Journal of Computer Science & Technology 2013年第1期28卷 42-53页

作者： Jin-Tao Meng jian-Rui Yuan sheng-zhong Feng Lian-sheng Tan Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Central South University Changsha 410083 China School of Information Science and Engineering Central China Normal University Wuhan 430079 China

Power saving is one of the key issues in Mobile Ad-Hoc Networks （MANETs）. It can be realized in Medium Access Control （MAC） layer and network layer. However, previous attentions were mainly paid to MAC layer or network layer with the aim of improving the channel utilization by adopting variable-range transmission power control. In this paper we focus on the power saving in both MAC layer and network layer, and propose a Power Adjusting Algorithm （PAA）. In the presence of host＇s mobility, PAA is designed to conserve energy by adjusting the transmission power to maintain the route＇s connectivity and restarting the route discovery periodically to find a new route with better energy efficiency dynamically. After analyzing the operations of PAA, we find that the length of route discovery restarting period is a critical argument which will affect power saving, and an energy consumption model is abstracted to find the optimal value of the restarting period by analyzing the energy consumption of this algorithm. PAA can handle the mobility of MANET by adjusting the transmission power and in the meantime save energy by restarting route discovery periodically to balance the energy consumption on route discovery and packet delivering. Simulation results show that, PAA saves nearly 40% energy compared with Dynamic Source Routing protocol when the maximum speed of mobile hosts is larger than 8 m/s.

关键词： mobile ad-hoc networks mobility control power control power efficiency

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纯棉厚重织物低碱前处理工艺

西安工程大学学报 2013年第5期27卷 586-590页

作者：王洪海林明穗唐孝明钟建生三明职业技术学院轻纺工业系福建三明365000 三明学院资源与化工学院福建三明365000

应用氧化退浆剂D-2和多功能精练剂AW分别对纯棉厚重织物进行无碱退浆和低碱煮漂联合工艺.分析氧化退浆剂D-2用量、退浆温度、退浆时间对织物退浆效果的影响以及多功能精练剂AW用量、双氧水用量、煮漂处理时间等工艺因素对织物煮漂效果... 详细信息

应用氧化退浆剂D-2和多功能精练剂AW分别对纯棉厚重织物进行无碱退浆和低碱煮漂联合工艺.分析氧化退浆剂D-2用量、退浆温度、退浆时间对织物退浆效果的影响以及多功能精练剂AW用量、双氧水用量、煮漂处理时间等工艺因素对织物煮漂效果的影响,并将新工艺处理的效果与传统强碱前处理工艺处理的效果作比对.实验结果表明,用优化的工艺对纯棉厚重织物进行低碱前处理,处理后的织物毛细管效应值较高,强力损伤较低,手感柔软,半制品质量较好,效果优于传统强碱前处理的效果,而且煮漂废液含碱量低至0.96g/L以下,可以降低废水处理负荷,符合清洁生产的要求.

关键词：纯棉厚重织物低碱前处理多功能氧漂精练剂AW 半制品质量

Particle agglomeration behavior in fluidized bed during direct reduction of iron oxide by CO/H_(2)mixtures

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Journal of Iron and Steel Research International 2023年第4期30卷 626-634页

作者： Feng Lu Hong zhong Bo Liu jian Xu sheng-fu Zhang Liang-ying Wen School of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China School of Mechanical and Materials Engineering Washington State UniversityPullmanWA 99163USA

The agglomeration behavior of particles significantly impacts on the defluidization occurring in a fluidized bed during the direct reduction *** influence of CO/H_(2)ratio on surface diffusion of iron atoms was proposed,and the solid bridge force between iron oxide particles was quantificationally ***,the solid bridge force was successfully added into a CFD–DEM(computational fluid dynamics–discrete element method)model combined with heat transfer and mass transport to investigate the detailed information of agglomeration in a fluidized bed,including the spatial distribution of temperature,velocity and metallization of iron oxide *** region of defluidization is sensitive to the reduction *** the same reduction temperature,the iron oxide powder will perform higher metallization and stable fluidization properties with molar fraction of H_(2)in the range of 0.6–0.8,when iron oxide is reduced by CO/H_(2)mixture.

关键词： Direct reduction Computational fluid dynamics Discrete element method Particle agglomeration CO/H_(2)mixture Micro morphology

The Classification of 2 and 3 Torsion Free Polyhedra

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Acta Mathematica Sinica,English Series 2015年第11期31卷 1659-1682页

作者： jian zhong PAN zhong jian ZHU Academy of Mathematics and Systems Science Chinese Academy of Sciences

We classify the stable homotopy types of （n- 1）-connected, （n ＋ k）-dimensional polyhedra with 2 and 3-torsion free homologies for k 〈 6. The technique used is matrix problem （bimodule categories） which is give... 详细信息

关键词： Homotopy indecomposable matrix problem

Cutting Performance and Wear Behavior of AITiN-and TiAlSiN-Coated Carbide Tools During Dry Milling of Ti-6Al-4V

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Acta Metallurgica Sinica(English Letters) 2020年第3期33卷 459-470页

作者： Jie Liu Shui-sheng Zhu Xin Deng jian-Ye Liu zhong-Ping Wang Zhi Qu School of Electromechanical Engineering University of Technology Guangzhou 510006China School of Electromechanical Engineering Guangzhou Panyu PolytechnicGuangzhou 511483China Guangdong Hanbang 3d Technology Co. Ltd.Zhongshan 528427China Heyuan Fuma Cemented Carbide Co. Ltd.Heyuan 517583China Guangdong Fenghua Zhuoli Technology Co. Ltd.Foshan 528225China

Machining,especially dry machining of titanium alloys,has been one of the most significant challenges for carbide cutting *** this study,aluminum-rich AlTiN coating,as well as TiAlSiN nanocomposite coating,were successfully employed for dry milling of Ti-6 A1-4 V alloy with high efficiency and long tool *** the cutting speeds of 150 m/min and 200 m/min,the tool life of the TiAlSiN-coated tool exceeds that of AlTiN-coated tool by 32 and 66%,*** wear modes for both coated tools include the uniform flank wear,smooth wear,chipping,coating and substrate flaking,crater and notch wear,and the wear mechanisms include adhesion,diffusion,oxidation and *** them,the wear mechanism is dominated by the adhesion and oxidation *** compared with AlTiN coating,TiAlSiN coating exhibits better mechanical properties and oxidation resistance,which contribute to a better cutting performance,fewer thermal cracks and smaller and uniform workpiece chips during the dry milling of Ti-6 A1-4 V alloy.

关键词： Cutting performance Wear behavior Ti-6Al-4V AlTiN coating TiAlSiN coating

O2iJoin： An Efficient Index-Based Algorithm for Overlap Interval Join

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Journal of Computer Science & Technology 2018年第5期33卷 1023-1038页

作者： Ji-Zhou Luo sheng-Fei Shi Guang Yang Hong-Zhi Wang jian-zhong Li School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 China Guangdong Key Laboratory of Popular High Performance Computers Key Laboratory of Service Computing and Application Shenzhen 518000 China

Time intervals are often associated with tuples to represent their valid time in temporal relations, where overlap join is crucial for various kinds of queries. Many existing overlap join algorithms use indices based on tree structures such as quad-tree, B＋-tree and interval tree. These algorithms usually have high CPU cost since deep path traversals are unavoidable, which makes them not so competitive as data-partition or plane-sweep based algorithms. This paper proposes an efficient overlap join algorithm based on a new two-layer flat index named as Overlap Interval Inverted Index （i.e., O2i Index）. It uses an array to record the end points of intervals and approximates the nesting structures of intervals via two functions in the first layer, and the second layer uses inverted lists to trace all intervals satisfying the approximated nesting structures. With the help of the new index, the join algorithm only visits the must-be-scanned lists and skips all others. Analyses and experiments on both real and synthetic datasets show that the proposed algorithm is as competitive as the state-of-the-art algorithms.

关键词： overlap interval join temporal relation overlap inverted index join algorithm

A new heuristic for task scheduling in heterogeneous computing environment

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第12期9卷 1715-1723页

作者： Ehsan Ullah MUNIR jian-zhong LI sheng-fei SHI Zhao-nian ZOU Qaisar RASOOL School of Computer Science and Technology Harbin Institute of TechnologyHarbin 150001China Department of Computer Science COMSATS Institute of Information TechnologyWah Cantt 47040Pakistan

Heterogeneous computing (HC) environment utilizes diverse resources with different computational capabilities to solve computing-intensive applications having diverse computational requirements and constraints. The task assignment problem in HC environment can be formally defined as for a given set of tasks and machines, assigning tasks to machines to achieve the minimum makespan. In this paper we propose a new task scheduling heuristic, high standard deviation first (HSTDF), which considers the standard deviation of the expected execution time of a task as a selection criterion. Standard deviation of the ex- pected execution time of a task represents the amount of variation in task execution time on different machines. Our conclusion is that tasks having high standard deviation must be assigned first for scheduling. A large number of experiments were carried out to check the effectiveness of the proposed heuristic in different scenarios, and the comparison with the existing heuristics (Max-min, Sufferage, Segmented Min-average, Segmented Min-min, and Segmented Max-min) clearly reveals that the proposed heuristic outperforms all existing heuristics in terms of average makespan.

关键词： Heterogeneous computing Task scheduling Greedy heuristics High standard deviation first (HSTDF) heuristic