Research on e-commerce transaction networks using multi-agent modelling and open application programming interface

We provide a formal definition of an e-commerce transaction network. Agent-based modelling is used to simulate e-commerce transaction networks. For real-world analysis, we studied the open application programming interfaces (APIs) from eBay and Taobao e-commerce websites and captured real transaction data. Pajek is used to visualise the agent relationships in the transaction network. We derived one-mode networks from the transaction network and analysed them using degree and betweenness centrality. Integrating multi-agent modelling, open APIs and social network analysis, we propose a new way to study large-scale e-commerce systems.     

On the determination of an optimal sample size

Abstract

In works on sample survey theory and methods the sample size is usually regarded as determined by the sampling procedure and the total cost of the survey.     

浅谈仿真技术在高校新校区建筑施工中的应用

通过对虚拟仿真技术的概念及高校新校区建筑施工的特点的阐述,就虚拟仿真技术在新校区建筑施工中的应用进行了探索分析。     

基于AMESim的某型火箭炮液压系统仿真

火箭炮高平机控制火箭炮高低方向的运动,并赋予火箭炮固定射角,对于火炮的正常工作十分关键。本文应用AMEsim仿真软件对某型火箭炮高低机进行建模仿真,清晰展示了高平机和电液伺服系统的工作过程,为专家系统的建立和故障诊断提供了有力依据。     

Prediction of acute and chronic complications by a new computer simulation model for type 1 and type 2 diabetes: the Diabetes Mel l it us Model (DMM)

Summary

An epidemiological simulation model for patients with type 1 and type 2 diabetes (the Diabetes Mellitus Model (DMM)) was developed based on published clinical and observational data and expert estimations, for prediction of short- and long-term outcomes in defined patient cohorts. A computer program was developed with an interface for definition of patient cohorts and for results display. Patient cohorts can be user-defined by gender, age, duration and type of diabetes, glycosylated haemoglobin, blood pressure, albumin excretion and therapy. Based on risk

equations and current risk variable levels, the DMM simulates complications over 10 years (hypoglycaemia; retinopathy; blindness; microalbuminuria and macroalbuminuria; end-stage renal disease; neuropathy; amputation; diabetic foot syndrome; myocardial infarction; stroke; angina pectoris; heart failure; and death). The DMM is suitable for simulation of complications and for estimation of clinical implications of various diabetes care strategies, and may be particularly valuable in lieu of long-term clinical trial data.     

柳工856装载机电气故障模拟试验台开发

由于装载机结构庞大,电器元件隐蔽分散,不适合实物教学。我院研制开发的柳工856装载机电气故障模拟试验台结构紧凑、尺寸小,可在实验室内直接进行实验。教学效果较好,而且经济效益明显,占用实验室空间小。对国内高职院校工程机械电气课程教学有一定的示范和借鉴作用。     

极软表土层支护技术研究

通过对回风斜井的围岩性质及巷道破坏原因分析,结合数值模拟,提出了U型钢支架与短锚杆全长锚固巷道底角加锚索并喷射混凝土封闭围岩支护治理方案。经实验表明,上述方案的实施取得了良好的支护效果。     

Numerical evaluation of the critical price and American options

An approximate solution to the American put value is proposed and implemented numerically. Relaxation techniques enable the critical price to be determined with high accuracy. The method uses a modification of the quadratic approximation of MacMillan and Barone-Adesi and Whaley which gives an expression for the critical price. Numerical experimentation and iterative methods quickly provide highly accurate solutions.     

Can Banks Self‐Regulate? Voluntary Agreements,Intrinsic Motivation and Games

This article argues that lessons on how to achieve a sustainable financial system can be learnt from the work done on sustainable commons (on common‐pool resources – CPRs – where there is no ‘tragedy of the commons’). Existing approaches to financial regulation may not give proper attention to available solutions. The article proposes that innovative solutions could be tested using experimental methods commonly used in CPRs: repeat run, feedback driven games.     

压路机碾压荷载在施工期对路基拼接变形影响的数值分析

以合肥铁路枢纽改造工程为研究对象,路基拼接中应用的不同压路机碾压荷载为研究目标,通过FLAC软件就不同路基高度下应用不同压路机荷载对既有线列车安全运营和路基稳定性的影响进行了数值模拟计算。结果表明,同一路基高度,不同压路机荷载作用下,坡脚A点和新、老路基搭接处B点的垂直变形增量随压路机荷载的增大而增大;相同压路机荷载下随着路基高度的增加,老路基面、坡脚点以及新老路基搭接处的垂直方向变形与路基高度不成线性关系,采用6 m高度的路基更为合理,有利于线路列车运行的安全性和路基整体的稳定性。