Revitalising serial entrepreneurship in sub-Saharan Africa: insights from a newly emerging economy

In light of the growing national priority to develop and revitalise entrepreneurship in emerging economies, our understanding of barriers to serial entrepreneurship (SE) in such a context warrants further scholarly attention. Using insights from Ghana, an integrated framework of endogenous and exogenous barriers to SE is advanced. The study identified factors such as stigmatisation of business failure, fear of failure, successive governments’ suspicion of the private sector and lack of a clear national policy as barriers to the development of SE. By creating conditions for de-stigmatising of failure, countries would be able to create conditions for more serial entrepreneurs to emerge and flourish. The analysis also indicates that reinvigorating entrepreneurship by providing space and opportunity for failed entrepreneurs to re-emerge would enable such countries to enhance entrepreneurial activities and improve economic development. The implications for technology analysis and strategic entrepreneurship literature are identified and examined.     

Blockchain for tracking serial numbers in money exchanges

Money exchange is one of the most common day‐to‐day activities performed by humans in the daily market. This paper presents an approach to money tracking through a blockchain. The proposed approach consists of three main components: serial number localization, serial number recognition, and a blockchain to store all transactions and ownership transfers. The approach was tested with a total of 110 banknotes of different currency types and achieved an average accuracy of 91.17%. We conducted a user study in real‐time with 21 users, and the mean accuracy across all users was 86.42%. Each user gave us feedback on the proposed approach, and most of them welcomed the idea.     

Quantile serial dependence in crude oil markets: evidence from improved quantilogram analysis with quantile wild bootstrapping

We examine the quantile serial dependence in crude oil prices based on the Linton and Whang’s quantile-based portmanteau test which we improved by means of quantile wild bootstrapping (QWB). Through Monte Carlo simulation, we find that the quantile wild bootstrap-based portmanteau test performs better than the bound testing procedure suggested by Linton and Whang. We apply the improved test to examine the efficiency of two crude oil markets – WTI and Brent. We also examine if the dependence is stable via rolling sample tests. Our results show that both WTI and Brent are serially dependent in all, except the median quantiles. These findings suggest that it may be misleading to examine the efficiency of crude oil markets in terms of mean (or median) returns only. These crude oil markets are relatively more serially dependent in non-median ranges.     

A characterization of the extended serial correspondence

We study the problem of assigning objects to a group of agents. We focus on probabilistic methods that take agents’ ordinal preferences over the objects. Importantly, we allow for indifferences among objects. Katta and Sethuraman (2006) propose the extended serial correspondence to solve this problem. Our main result is a characterization of the extended serial correspondence in welfare terms by means of stochastic dominance efficiency, stochastic dominance no-envy and “limited invariance,” a requirement we adapt from Heo (2014a). We also prove that an assignment matrix is selected by the extended serial correspondence if and only if it satisfies “non-wastefulness” and “ordinal fairness,” which we adapt from Kesten et al. (2011).     

一种380 V交流输入的多路输出开关电源

介绍了一种用于大功率IGBT厚膜驱动电路的380V系统输入、多路输出辅助开关电源。该开关电源采用新颖的双管串联模式，解决了高电压输入条件下开关管的选用难题。与传统供电电源相比，该电源电路简单、体积小、重量轻、效率高、允许输入电压范围宽，具有很高的实用价值。该电源已研制成功并已投入实际应用。     

基于LabVIEW的远程数据采集终端通信接口的设计与实现

对LabVIEW的串行通信接口驱动进行了研究,对用VISA编程进行了初步的尝试,设计并实现了基于LabVIEW的上位机控制程序,以及基于MCS-51单片机控制的数据采集终端的数据存储与控制,完成了基于8051单片机的远程数据采集终端的上位机串口通信接口部分程序,并且通过了测试.     

多线程在水泥回转窑旋风预热器远程监控系统中的应用

基于水泥回转窑旋风预热器远程监控系统的要求，应用多线程技术实现了旋风预热器整个运行过程中的数据采集处理、图像动态显示、数据库访问以及故障报警等多任务的同步运行，从而提高了整个系统的运行效率和速度。     

基于单片机的数据复用器研究

本文探讨的是一个两路的数据复用器，该数据复用器采用异步串行通信方式，主要用89C51单片机来实现，我们从硬件和软件两方面完成了数据复用器的设计与开发及调试，通过实际的安装，基本达到了该复用器的设计性能指标，它具有结构简单、体积小、传输数据可靠等特点。     

Distributive and Additive Costsharing of an Homogeneous Good

Individual users demand different quantities of a homogeneous good produced under variable returns. We describe the family of costsharing methods that allocate costs in proportion to demands when returns are constant, and commute with the additivity and composition of cost functions. Two simple such methods are average cost pricing and incremental costsharing. All other methods in the family combine elements of the average cost and incremental ones. Serial costsharing stands out prominently in the family, whereas the Shapley–Shubik method, and all values from the associated stand alone cooperative game, are excluded.Journal of Economic LiteratureClassification Numbers: D63, C71.     

基于RapidIO的TIPC通信软件设计

将透明处理器间通信协议（TIPC）与基于高性能包交换的RapidIO总线相结合,并对RapidIO 的应用层协议进行扩展和定义,可以实现全新的基于RapidIO网络的TIPC通信软件。该软件 采用层次化和可扩展的协议来定义开放处理器间的通信协议,为各种应用提供面向消息的、 与位置无关的通信服务和标准的API函数接口,为解决多处理器、多模块和多系统互连问题 提供了方案。基于RapidIO网络的TIPC通信软件在测试中取得了良好的测试结果。