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Exploring optimal combination of a file system and an I/O scheduler for underlying solid state disks

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第8期15卷 607-621页

作者： Hui SUN Xiao qin Chang-sheng XIE National Laboratory for Optoelectronics and School of Science and Technology Huazhong University of Science and Technology Department of Computer Science and Software Engineering Auburn University

Performance and energy consumption of a solid state disk(SSD) highly depend on file systems and I/O schedulers in operating systems. To find an optimal combination of a file system and an I/O scheduler for SSDs, we use a metric called the aggregative indicator(AI), which is the ratio of SSD performance value(e.g., data transfer rate in MB/s or throughput in IOPS) to that of energy consumption for an SSD. This metric aims to evaluate SSD performance per energy consumption and to study the SSD which delivers high performance at low energy consumption in a combination of a file system and an I/O scheduler. We also propose a metric called Cemp to study the changes of energy consumption and mean performance for an Intel SSD(SSD-I) when it provides the largest AI, lowest power, and highest performance, respectively. Using Cemp, we attempt to find the combination of a file system and an I/O scheduler to make SSD-I deliver a smooth change in energy consumption. We employ Filebench as a workload generator to simulate a wide range of workloads(i.e., varmail, fileserver, and webserver), and explore optimal combinations of file systems and I/O schedulers(i.e., optimal values of AI) for tested SSDs under different workloads. Experimental results reveal that the proposed aggregative indicator is comprehensive for exploring the optimal combination of a file system and an I/O scheduler for SSDs, compared with an individual metric.

关键词： Solid state disk(SSD) Performance Energy consumption File system I/O scheduler

Single-Hopf Bursting in Periodic Perturbed Belousov–Zhabotinsky Reaction with Two Time Scales

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Chinese Physics Letters 2013年第1期30卷 37-40页

作者： LI Xiang-Hong BI qin-sheng Department of Mathematics and Physics Shijiazhuang Tiedao UniversityShijiazhuang 050043 Faculty of Civil Engineering and Mechanics Jiangsu UniversityZhenjiang 212013

By introducing weak periodic perturbation to the Oregonator,we investigate a mathematical model with two time *** novel dynamical phenomena called the single-Hopf bursting with unusually quiescent state are *** related bifurcation mechanism is presented by means of the transition portrait and slow-fast analysis,which has rarely been reported in the previous works associated with the Oregonator ***,the influence of forcing amplitude on bursting behaviors is *** investigation finds that excitation amplitude may play an important role in a two-timescale system with the slow procedure dominated by periodic perturbation.

关键词： Hopf periodic Periodic

Fabrication of Carbon Nanotube-Reinforced 6061Al Alloy Matrix Composites by an In Situ Synthesis Method Combined with Hot Extrusion Technique

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Acta Metallurgica Sinica(English Letters) 2016年第2期29卷 188-198页

作者： Chun-Nian He Chao feng Ji-Chuan Lin En-Zuo Liu Chun-sheng Shi Jia-Jun Li Nai-qin Zhao School of Materials Science and Engineering Tianjin KeyLaboratory of Composite and Functional MaterialsTianjin University Tianjin 300072 China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 China Chengdu SIWI High-Tech Industry Co. Ltd Chengdu 611731 China

Carbon nanotube （CNT）-reinforced 6061Al alloy matrix composites were prepared by chemical vapor depo- sition （CVD） combined with hot extrusion technique. During the preparation process, the 6061Al flakes obtained by ball milling of the 6061Al spherical powders were subjected to surface modification to introduce a hydrophilic polyvinyl alcohol （PVA） membrane on their surface （6061Al@PVA） to bond strongly with nickel acetate [Ni（II）]. Then the 6061Al@PVA flakes bonded with Ni（II） were calcined and reduced to Ni nanoparticles, which were then heat-treated at 580 ℃ to remove PVA for obtaining even Ni/6061Al catalyst. After that, the as-obtained Ni/6061Al catalyst was employed to synthesize CNTs on the surface of the 6061Al flakes by CVD. After hot extrusion of the CNT/6061Al composite powders, the as-obtained CNT/6061Al bulk composites with 2.26 wt% CNTs exhibited 135% increase in yield strength and 84.5% increase in tensile strength compared to pristine 6061Al matrix.

关键词： Metal matrix composites (MMCs) Microstructure Mechanical properties Carbon

Talagrand Inequality on Free Path Space and Application to Stochastic Reaction Diffusion Equations

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Acta Mathematicae Applicatae Sinica 2020年第2期36卷 253-261页

作者： feng-yu WANG Tu-sheng ZHANG Center for Applied Mathematics Tianjin UniversityTianjin 300072China Department of Mathematics Swansea UniversityBay CampusSAI 8ENUK School of Mathematics University of ManchesterOxford RoadManchester M139PLUK School of Mathematics University of Science and Technology of ChinaHefei 230026China

By using a split argument due to[1],the transportation cost inequality is established on the free path space of Markov *** general result is applied to stochastic reaction diffusion equations with random initial values.

关键词： Stochastic reaction diffusion equations Talagrand transportation cost inequality free path space.

Audit of the Implementation Effect of Economic Policies: A New Domain of Government Audit

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当代财经 2013年第S1期 121-129页

作者： qin Rong-sheng Beijing National Accounting Institute

The government audit authority has the necessity and feasibility to carry out the audit of the implementation effect of economic *** evaluating index system for the audit of the implementation effect of economic policies includes the legality,scientificity,rationality,applicability,operability and performance of the economic *** at present this kind of audit is still a new area,we shall quicken the steps of theoretical researches for the audit of the implementation effect of economic policies,innovate the auditing procedures and methods,improve the construction of the related system of laws and regulations and the teams of auditing professionals,and give full play to the"immune system"function of the government audit.

关键词： economic policy effect of implementation government audit

Cusp Bursting and Slow-Fast Analysis with Two Slow Parameters in Photosensitive Belousov–Zhabotinsky Reaction

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Chinese Physics Letters 2013年第7期30卷 30-33页

By introducing weakly periodic perturbation given by light,the three-variable model of photosensitive Belousov–Zhabotinsky reaction with two time scales may possess two slow *** codimension-2 bursting called cusp bursting is novel,especially the phenomenon that is of the transiently quiescent state mixed among repetitively large amplitude *** slow-fast dynamics analysis with two slow parameters,based on overlapping the codimension-2 bifurcation diagram of the fast subsystem with the 3-dimensional transition phase portrait of the whole system,is proposed to reveal the bifurcation mechanism of bursting oscillation with two slow *** adjustment behavior of slow parameters is used to explain the transformation between the spiking state and quiescent state.

关键词： state. bifurcation weakly

Multi-objective optimization design of deviation-correction trajectory considering the production loss in shale gas cluster well

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Petroleum Science 2022年第6期19卷 2995-3003页

作者： Zi-Jun Dou Yong-sheng Liu Xing qin De-Li Gao Gan-sheng Yang Key Laboratory of Deep Geological Drilling Technology of Ministry of Natural Resources China University of GeosciencesBeijing 100083China Sinopec Research Institute of Petroleum Engineering Beijing 100101China MOE Key Lab of Petroleum Engineering China University of PetroleumBeijing 102249China

In shale gas mining,the inter-fracture interference effect will significantly occur if the actual well deviates from the planned *** reduce production loss,operators want to get back on the planned trajectory economically and *** on this,a multi-objective optimization model of deviationcorrection trajectory is established considering the production loss ***,the functional relationship between the production envelope and the fracturing depth is constructed,and the production loss is obtained by combining the calculation method of volume *** on the proposed“double-arc”trajectory design method,the production loss of the fracture on the deviation-correction trajectory is ***,combined with the well profile energy evaluation,a new optimization model of deviation-correction trajectory is *** results demonstrate that after optimizing the fracturing depth,the production loss of the deviation-correction trajectory is reduced by 13.2%.The maximum curvature value results in a trajectory with a minimum production loss yet a maximum well profile *** proposed model reduces the well profile energy by 15.6%compared with the existing *** is proved that the proposed model can reduce the probability of drilling accidents and achieve high gas production in the later mining *** study fully considers various factors affecting horizontal wells in the fracturing area,which can provide theoretical guidance for the design of deviationcorrection trajectory.

关键词： Shale gas Inter-fracture interference effect Production loss Deviation-correction trajectory Multi-objective optimization

Chidamide combined with traditional chemotherapy for primary cutaneous aggressive epidermotropic CD8+cytotoxic T-cell lymphoma:A case report

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World Journal of Clinical Cases 2022年第4期10卷 1341-1348页

作者： Zhen-Dong He Hai-Yan Yang sheng-sheng Zhou Man Wang qin-Li Mo feng-Xiang Huang Zhi-Gang Peng Department of Medical Oncology The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021Guangxi Zhuang Autonomous RegionChina

BACKGROUND Traditional chemotherapy has benefited many patients with non-Hodgkin's lymphoma,but results in a very poor response in patients with rare lymphomas or refractory *** studies have shown that chidamide has potential anti-lymphoma activity and reverses lymphoma cell chemoresistance to increase the chemosensitivity of lymphoma cells to traditional *** SUMMARY A 14-year-old boy was admitted to our hospital with a 5-d history of generalized erythema,papules,and ***,the disease was refractory to potent antiallergic and anti-infective treatment,and his condition progressively *** biopsy revealed primary cutaneous aggressive epidermotropic CD8+cytotoxic T-cell *** that the disease is extremely rare in clinical practice,existing case reports have shown poor efficacy with traditional chemotherapy *** recommend chidamide combined with traditional chemotherapy for *** regimen was as follows:Chidamide 30 mg/biw,cyclophosphamide 1100 mg/d1,pirarubicin 70 mg/d1,vincristine 2 mg/d1,dexamethasone 20 mg/d1-5,etoposide 100 mg/d1-5,in a 21 d *** treatment effect was considerable,and complete remission was achieved after 4 cycles of treatment,after which the patient completed a total of 6 cycles of ***,the patient regularly took chidamide 20 mg/biw as maintenance therapy for 1 *** date,the patient has been disease-free for 3 *** This case suggests that the combination of chidamide and traditional chemotherapy is effective in primary cutaneous aggressive epidermotropic CD8+cytotoxic T-cell lymphoma.

关键词： Chidamide Primary cutaneous aggressive epidermotropic CD8+cytotoxic Tcell lymphoma Traditional chemotherapy Case report

Multi-bubble motion behavior of electric field based on phase field model

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Chinese Physics B 2019年第3期28卷 238-245页

作者： Chang-sheng Zhu Dan Han Li feng sheng Xu School of Computer and Communication Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Gansu Advanced Processing and Recycling of Non-Ferrous Metal Lanzhou 730050China

By coupling the phase field model with the continuity equation of incompressible fluid, Navier–Stokes equation,electric field equation, and other governing equations, a multi-field coupling model for multi-bubble coalescence in a viscous fluids is established. The phase field method is used to capture the two-phase interface. The motion and coalescence of a pair of coaxial bubbles under an external uniform electric field and the effects of different electric field strengths on the interaction and coalescence of rising bubbles are studied. The results show that the uniform electric field accelerates the collision and coalescence process of double bubbles in the fluid, and increases the rising velocity of the coalesced *** electric field with an intensity of E = 2 kV/mm is reduced about 2 times compared with that without electric field in coalescence time. When the electric field strength is strong(E ≥ 1 kV/mm), the coalesced bubble will rupture before it rises to the top of the calculation area, and the time of the bubble rupturing also decreases with the increase of the electric field strength. The phase field method is compared with the simulation results of Lattice Boltzmann Method(LBM), and the shape of bubble obtained by the two methods is in good agreement, which verifies the correctness of the calculation model.

关键词： electro-hydro dynamics multi-bubble phase field