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System Dynamic Modelling of patient Flow and Transferral Problem in a Mixed Public-Private healthcare System:A case Study of hong Kong SAR

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Journal of Systems Science and Systems Engineering 2020年第5期29卷 590-608页

作者： c.K.M.LEE W.c.TAI Kam K.h.NG Department of Industrial and Systems Engineering The Hon g Kong Polytechnic UniversityHung HornHong Kong SARChina School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

The current healthcare system in hong Kong is experiencing pressure due to constrained resources,with dramatic increases in inpatient services queue lengths,dissatisfaction with the working environment,unacceptable workforce arrangements and high turnover rate of hospital *** maintain the robustness of the healthcare system and a sustainable inpatients flow,the Food and health Bureau launched a public-private partnership programme to utilise the resources of the public and private *** research investigates the potential for extension of the programme and further enhancing the sustainability of the long-term inpatient services under a mixed public-private healthcare policy via system dynamic *** findings show that an increase of human resources in public hospitals does not substantially improve inpatient flow rate ***,the results from the system dynamic approach provide insights into the expansion of the service areas of the programme and suggest increasing the number of referrals to private hospitals.

关键词： System dynamic models scenario analysis inpatient transferral mixed public-private healthcare system

The use of the node-based smoothed finite element method to estimate static and seismic bearing capacities of shallow strip footings

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第1期14卷 180-196页

作者： h.c.Nguyen T.Vo-Minh Department of civil and environmental engineering imperial college londonuk Department of civil engineering and industrial design university of liverpoolliverpooluk Faculty of civil engineering ho chi minh city university of technology(hutech)ho chi minh cityviet nam

The node-based smoothed finite element method(NS-FEM)is shortly presented for calculations of the static and seismic bearing capacities of shallow strip footings.A series of computations has been performed to assess variations in seismic bearing capacity factors with both horizontal and vertical seismic *** results obtained agree very well with those using the slip-line method,revealing that the magnitude of the seismic bearing capacity is highly dependent upon the combinations of various directions of both components of the seismic *** upward vertical seismic acceleration reduces the seismic bearing capacity compared to the downward vertical seismic acceleration in *** addition,particular emphasis is placed on a separate estimation of the effects of soil and superstructure inertia on each seismic bearing capacity *** the effect of inertia forces arising in the soil on the seismic bearing capacity is non-trivial,and the superstructure inertia is the major contributor to reductions in the seismic bearing *** tables and charts are given for practical application to the seismic design of the foundations.

关键词： Limit analysis Node-based smoothed finite element method(NS-FEM) Second-order cone programming(SOcP) Seismic bearing capacity Strip footing

Recent progress of interconnecting layer for tandem organic solar cells

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Science china chemistry 2017年第4期60卷 460-471页

作者： Shunmian Lu Dan Ouyang Wallace c.h. choy Department of Electrical and Electronic Engineering The University of Hong Kong Pok Fu Lam Road Hong Kong China

This paper has reviewed:(1) the two unique advantages of tandem organic solar cells(OScs) compared to single OScs;(2) the challengings as well as strategies to develop qualified interconnecting layer(IcL) for tandem *** specifically,firstly,the two key advantages unique to tandem OScs as compared to single OScs,namely minimizing sub-bandgap transmission and thermalization loss as well as realizing optical thick and electrical thin structures,have been ***,the IcL,as one of the most challenging issue in tandem OScs that needs to fulfill the optical,electrical and mechanical requirements simultaneously to realize a qualified IcL has been *** one of the most challenging requirement among the three,the electrical requirement and its corresponding three different solving strategies have been discussed in detail,revealing a bright future for developing a general strategy to realizing qualified IcL composed of different hole transporting layer(hTL) and electron transporting layer(ETL).

关键词： tandem organic solar cell interconnecting layer

A stable cS-FEM for the static and seismic stability of a single square tunnel in the soil where the shear strength increases linearly with depth

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第4期14卷 1253-1265页

作者： h.c.Nguyen L.Nguyen-Son Department of civil and Environmental Engineering Imperial College LondonLondonUK Department of civil Engineering and Industrial Design University of LiverpoolLiverpoolUK Faculty of civil Engineering Ho Chi Minh City University of Technology(HUTECH)Ho Chi Minh CityViet Nam

A numerical procedure using a stable cell-based smoothed finite element method(cS-FEM)is presented for estimation of stability of a square tunnel in the soil where the shear strength increases linearly with *** kinematically admissible displacement fields are approximated by uniform quadrilateral elements in conjunction with the strain smoothing technique,eliminating volumetric locking issues and the singularity associated with the Mohrecoulomb ***,a rich set of simulations was performed to compute the static stability of a square tunnel with different geometries and soil *** presented results are in excellent agreement with the upper and lower bound solutions using the standard finite element method(FEM).The stability charts and tables are given for practical use in the tunnel design,along with a newly proposed formulation for predicting the undrained stability of a single square ***,the seismic stability number was computed using the present numerical *** results reveal that the seismic stability number reduces with an increasing value of the horizontal seismic acceleration(a_(h)),for both cases of the weightless soil and the soil with unit ***,the link between the static and seismic stability numbers is described using corrective factors that represent reductions in the tunnel stability due to seismic *** is shown from the numerical results that the corrective factor becomes larger as the unit weight of soil mass increases;however,the degree of the reduction in seismic stability number tends to reduce for the case of the homogeneous ***,this advanced numerical procedure is straightforward to extend to three-dimensional(3D)limit analysis and is readily applicable for the calculation of the stability of tunnels in highly anisotropic and heterogeneous soils which are often encountered in practice.

关键词： Tunnels Stability Limit analysis cell-based smoothed finite element method (cS-FEM) Second-order cone programming(SOcP)

hot Data Identification with Multiple Bloom Filters： Block-Level Decision vs I/O Request-Level Decision

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Journal of computer Science & Technology 2018年第1期33卷 79-97页

作者： Dongchul park Weiping he h. c. Du Division of computer and Electronic Systems Engineering Hankuk University of Foreign Studies Gyeonggi-do 17035 Korea Intel corporation Hillsboro OR 97124 U.S.A. Dell Storage Eden Prairie MN 55344 U.S.A. Department of computer Science and Engineering University of Minnesota-Twin Cities Minneapolis MN 55455 U.S.A.

hot data identification is crucial for many applications though few investigations have examined the subject. All existing studies focus almost exclusively on frequency. however, effectively identifying hot data requires equally considering recency and frequency. Moreover, previous studies make hot data decisions at the data block level. Such a fine-grained decision fits particularly well for flash-based storage because its random access achieves performance comparable with its sequential access. however, hard disk drives （hDDs） have a significant performance disparity between sequential and random access. Therefore, unlike flash-based storage, exploiting asymmetric hDD access performance requires making a coarse-grained decision. This paper proposes a novel hot data identification scheme adopting multiple bloom filters to efficiently characterize recency as well as frequency. consequently, it not only consumes 50% less memory and up to 58% less computational overhead, but also lowers false identification rates up to 65% compared with a state-of-the-art scheme. Moreover, we apply the scheme to a next generation hDD technology, i.e., Shingled Magnetic Recording （SMR）, to verify its effectiveness. For this, we design a new hot data identification based SMR drive with a coarse-grained decision. The experiments demonstrate the importance and benefits of accurate hot data identification, thereby improving the proposed SMR drive performance by up to 42%.

关键词： hot data bloom filter shingled magnetic recording (SMR)

MgO-SiO_2-cr-O体系的亚固相相关系及有关含cr^(2+)端员矿物的热力学特征

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地质学报 1996年第2期70卷 173-185页

作者：李建平 h.Stc0'Neill F.Seifert 中国科学院广州地球化学研究所德国拜罗伊特大学地质研究所

在t=1100-1500℃和P=0-2.88Gpa条件下,实验确定了与金属cr平衡的SiO_2-cr-O及MgO-SiO_2-cr-O体系中的亚固相相关系。结果显示,在SiO_2-cr-O体系中,只发现绿铬矿-金属铬-石英(或鳞石英)组合;而在含MgO体系中,出现Mg-cr^(2+)橄榄石、辉石... 详细信息

在t=1100-1500℃和P=0-2.88Gpa条件下,实验确定了与金属cr平衡的SiO_2-cr-O及MgO-SiO_2-cr-O体系中的亚固相相关系。结果显示,在SiO_2-cr-O体系中,只发现绿铬矿-金属铬-石英(或鳞石英)组合;而在含MgO体系中,出现Mg-cr^(2+)橄榄石、辉石及尖晶石固溶体。cr^(3+)在橄榄石和辉石中的含量在可测定限度之下。当X_(cr^(2+))=[cr^(2+)/(Mg+cr^(2+))]>0.2时,辉石的结构由斜方晶系转为单斜晶系;尖晶石的结构由立方变为四方。对实验数据进行热力学模拟,求得Mg-cr^(2+)在橄榄石,辉石及尖晶石固溶体中的混合参数(W),以及铬橄榄石(cr_2SiO_4)、铬辉石(cr_2Si_2O_6)和铬尖晶石(cr_3O_4)的形成自由能(△G°)与温度的关系。

关键词： MgO-SiO2-cr-O 相平衡热力学特征铬矿

Rapid Growth of TiNi intermetallic compound within undercooled Ti_(50)Ni_(50)alloy under electrostatic levitation condition

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Journal of Materials Science & Technology 2021年第18期77卷 82-89页

作者： P.F.Zou c.h.Zheng L.hu h.P.Wang School of Physical Science and Technology Northwestern Polytechnical University.Xi'an710072China

The undercooling dependence of the solidification mechanism was systematically explored by the electrostatic levitation(ESL)*** the experiments,the maximum undercooling reached up to 406 K(0.26 T_L)and the growth velocity of the primary TiNi phase was in-situ determined at various *** the initial increase of alloy undercooling,the value of growth velocity sluggishly rose followed by a power *** this case,the primary TiNi phase preferentially developed as the equiaxed dendrite,then the remnant liquid participated as Ti_(2)Ni andα-Ti phases on the grain *** the undercooling exceeded the critical value of 350 K,the growth velocity of the primary phase displayed a sharply increase ***,the TEM results demonstrated that the precipitation of the intermetallic Ti_(2)Ni compound was gradually restrained during the rapid solidification and the R-phase existing in the TiNi matrix at large undercooling implied that the martensitic transformation was incomplete.

关键词： Undercooling Ti-Ni alloy Solidification Growth kinetics

Effect of interlayer addition on microstructure and mechanical properties of NiTi/stainless steel joint by electron beam welding

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Journal of Materials Science & Technology 2021年第2期61卷 16-24页

作者： h.Niu h.c.Jiang M.J.Zhao L.J.Rong cAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of ScienceShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China

NiTi/Stainless Steel(SS) sheets have been welded via a vacuum electron beam welding process, with three methods(offsetting electron beam to SS side without interlayer, adding Ni interlayer and adding Fe Ni interlayer), to promote mechanical properties of the Ni Ti/SS joints. The joints with different interlayers are all fractured in the weld zone near the Ni Ti side, which is attributed to the enrichment of intermetallic compounds including Fe2 Ti and Ni3 Ti. The fracture mechanisms of different joints are strongly dependent on the types of interlayers, and the joints without interlayer, adding Ni interlayer and adding Fe Ni interlayer exhibit cleavage fracture, intergranular fracture and mixed fracture composed of cleavage and tearing ridge, respectively. compared with the brittle laves phase Fe2 Ti, Ni3 Ti phase can exhibit certain plasticity, block the crack propagation and change the direction of crack propagation. The composite structure of Ni3 Ti and Fe2 Ti will be formed when the Fe Ni alloy is taken as the interlayer, which provides the joint excellent mechanical properties, with rupture strength of 343 Mpa.

关键词： NiTi Stainless steel Electron beam welding Interlayer Mechanical property

Model-based adaptive locomotion and clustering control of microparticles through ultrasonic topological charge modulation

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Applied Mathematics and Mechanics(English Edition) 2023年第4期44卷 623-640页

作者： h.S.LEE h.X.cAO D.JUNG c.S.KIM School of Mechanical Engineering Chonnam National UniversityGwangju 61186South Korea Korea Institute of Medical Microrobotics Gwangju 61011South Korea

We present a novel motion control technique for microrobot clusters to exploit the characteristics of the ultrasonic *** method comprises two steps,i.e.,introducing an ultrasonic actuation(UA)linear model for three-dimensional(3D)locomotion and controlling the topological charge(Tc)in the ultrasonic vortex for microrobot ***,the Tc is a controllable parameter for the expansion and contraction of the pressure null space inside the *** present a Tc control method to cluster sporadically distributed microrobots in a specific *** validate the concept,a UA system composed of 30 ultrasonic transducers with 1 Mhz frequency is fabricated,and the characteristics of the generated acoustic pressure field are analyzed through ***,the performances of the adaptive controller for precise 3D locomotion and the Tc control method for clustering are ***,the UA technology,which performs both clustering and locomotion in a complex manner,is validated with a gelatin phantom in an in-vitro environment.

关键词： ultrasonic actuation(UA) topological charge(Tc) adaptive control particle manipulation