Basics of qualitative research: Grounded theory procedures and techniques

物件導向軟體之架構(Object-Oriented Software Construction)探討

This paper estimates the impact of electrification on employment growth by analyzing South Africa 's mass roll-out of electricity to rural households Using several new data sources and two different identification strategies (an instrumental variables strategy and a fixed effects approach ), I find that electrification significantly raises female employment within five years This new infrastructure appears to increase hours of work for men and women, while reducing female wages and increasing male earnings Several pieces of evidence suggest that household electrification raises employment by releasing women from home production and enabling microenterprises Migration behavior may also be affected (JEL H54, L94,

/pdf/the-effects-of-rural-electrification-on-employment-new-2m109ocj0a.pdf

The Effects of Rural Electrification on Employment: New Evidence from South Africa

Governments are attempting to control the COVID-19 pandemic with nonpharmaceutical interventions (NPIs). However, the effectiveness of different NPIs at reducing transmission is poorly understood. We gathered chronological data on the implementation of NPIs for several European, and other, countries between January and the end of May 2020. We estimate the effectiveness of NPIs, ranging from limiting gathering sizes, business closures, and closure of educational institutions to stay-at-home orders. To do so, we used a Bayesian hierarchical model that links NPI implementation dates to national case and death counts and supported the results with extensive empirical validation. Closing all educational institutions, limiting gatherings to 10 people or less, and closing face-to-face businesses each reduced transmission considerably. The additional effect of stay-at-home orders was comparatively small.

Inferring the effectiveness of government interventions against COVID-19.

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/pdf/the-age-of-discontinuity-guidelines-to-our-changing-society-43cgrpykox.pdf

The age of discontinuity: guidelines to our changing society

Open standards have the potential to greatly simplify the way a utility's infrastructure is developed Moreover the software development process of applications based on that infrastructure is improved To facilitate the development of location based services (LBS), Parlay/OSA is used as an open standard development platform for such services It supports application programming interfaces for accessing different network architectures that can be used by LBS services to query for location of a mobile The Parlay/OSA framework also addresses security concerns For LBS services to be complete, a geospatial database must be used to provide information based on location An extension to the Parlay/OSA gateway is thus proposed to encapsulate the necessary APIs for querying geospatial databases

Developing location based services in Parlay/OSA

The accuracy of Received Signal Strength (RSS)-based positioning methods is highly variable due to its dependence on various varying parameters such as the wireless environment, topology of the network, propagation model utilized etc. In this paper, drive test data were analyzed to examine the effect of distances from the Mobile Station to the serving and neighbouring base stations (BSs) on the accuracy of four RSS-based geometric positioning methods. The relationship between the accuracy of these positioning methods and distances between the BSs were also considered. There is relatively varying differences that the topologies of the network have on the accuracy of the positioning algorithms. The RSS-based geometric algorithms considered include the Centre of Gravity, the Circular Trilateration, Circular Trilateration and the Least Square algorithms.

Effect of Distance on the Accuracy of RSS-Based Geometric Positioning Methods

Generalised convolution is a ubiquitous image processing operation in which a local operator is applied to an image in order to transform it in some manner. We present an extensible and flexible C++ implementation of generalised convolution in the image domain that is based on the Strategy design pattern. Our implementation facilitates the coding of different local operators.

https://ieeexplore.ieee.org/iel5/8212/25192/01146854.pdf

An implementation of generalised convolution for image processing

CART (Computer Aided Reticulation of Townships) is a software package used for the design of radial, electrical power distribution networks. Having many transformers and large numbers of consumers in the distribution network significantly increases computation time. A distributed, service-based platform is being developed, with parallelisation functionality for CART as the flagship service. The system will be used to parallelise CART's voltage and current calculations for use in the design of much larger networks, possibly of metropolitan scale. Eventually, more complex scenarios will be addressed, including real-time calculation and simulation of lightning and transient faults and performance testing and optimisation of existing power distribution networks.

B. Dwolatzky

Papers

Developing location based services in Parlay/OSA

Effect of Distance on the Accuracy of RSS-Based Geometric Positioning Methods

An implementation of generalised convolution for image processing

Parallelising calculations in electric power distribution networks

Some significant South African contributions to engineering