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New Estimates for the Shadow Economies all over the World
Friedrich Schneider,Andreas Buehn,Claudio E. Montenegro 한국국제경제학회 2010 International Economic Journal Vol.24 No.4
This paper presents estimations of the shadow economies for 162 countries, including developing, Eastern European, Central Asian, and high income OECD countries over 1999 to 2006/2007. According to our estimations, the weighted average size of the shadow economy (as a percentage of 'official' GDP) in Sub-Saharan Africa is 37.6%, in Europe and Central Asia (mostly transition countries) 36.4% and in high income OECD countries 13.4%. We find that an increased burden of taxation (direct and indirect ones), combined with (labour market) regulations and the quality of public goods and services as well as the state of the 'official' economy are the driving forces of the shadow economy.
Quantification of the Energy Flows during Ultrasonic Wire Bonding under Different Process Parameters
Yangyang Long,Friedrich Schneider,Chun Li,Jörg Hermsdorf,Jens Twiefel,Jörg Wallaschek 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.3
Despite of its wide and long-term application for interconnections in the field of microelectronics packaging, a quantitative understanding on the mechanisms of ultrasonic (US) wire bonding is still lacked. In this work, the energy flows from the electrical input energy to the different mechanisms during the US bonding process are quantified based on real-time observations via which the relative motions at the wire/substrate and the wire/tool interfaces can be detected. The relative motions at the two interfaces are proved to be caused by both the continuous plastic deformation and the US vibration. The normal force and US power interdependently affect the relative motion amplitudes. The deduced energy flows show that the energy from the transducer mainly flows to the vibration induced friction at the two interfaces and the microwelds formation, deformation and breakage. Despite of their significance to the process, the other mechanisms receive only little amount of energy. The impacts of the process parameters including normal force, US power and time on the energy flows are quantitatively investigated. A good coupling of the normal force and the US power guides more energy to the formation of microwelds while a long process time would increase the friction induced energy consumption.
Regional Estimates of the Shadow Economy in Europe
Egle Tafenau,Helmut Herwartz,Friedrich Schneider 한국국제경제학회 2010 International Economic Journal Vol.24 No.4
The aim of the paper is to estimate the extent of the shadow economy in the regions of the European Union. For this purpose the multiple-indicators multiple-causes approach combined with elements of spatial econometrics is implemented. The analysis shows that the shadow economy is most extensive in Eastern and Southern Europe, confirming results from previous literature. Within countries, the poorest regions tend to exhibit the highest shadow economy quotas. The smallest extent of shadow activities is obtained for the Netherlands and the United Kingdom, while in Poland the shadow economy is most extensive.