Adding Value to the Teaching and Learning of Design and Technology

It has been argued that design and technology can be used as a vehicle for teaching science and vice versa. In this paper, we report an investigation into Grade 6 students understandings of concepts embodied in the Systems strand of a technology syllabus as they grappled with a unit of work in technology for the first time. The unit of work involved students in the design and construction of simple systems, followed by experiences with more complex systems. Qualitative research methods were used to investigate the activities of the students as they engaged in the design and technology learning experiences for eight weeks. Data sources included student and teacher interviews, video and audio recordings of whole class and small group interactions, students notes, drawings and diagrams, and researchers field notes and reflections. Changes in students ability to identify the individual components and analyse how the components worked together in systems, and evidence of students use of scientific understandings for explanations, were noted as the unit of work progressed. An improvement was observed in students abilities to describe relationships between inputs, processes and outputs, and outline sequences of cause and effect. The technology and science appeared to be complementary as they developed technology specific and action-oriented technology and science language, which may be evidence of the presence of a community of learners. Recommendations are proposed for enhancing the value of both design and technology and science if both subjects are taught together as part of an integrated program in primary schools.     

Technical Efficiency of the Brazilian Municipalities: Correcting Nonparametric Frontier Measurements for Outliers

In this paper we estimate the DEA technical efficiency for 4796 Brazilian municipalities, by applying a recently proposed “Jackstrap” method, which combines Bootstrap and Jackknife resampling techniques, to reduce the effect of outliers and possible errors in the data set. We perform calculations to identify and eliminate high leverage municipalities, using different variants of Data Envelopment Analysis (DEA), as well as Free Disposal Hull (FDH). Corroborating previous results, efficiency results for the Brazilian municipalities show a clear relationship between the size of the municipality and its efficiency scores. Indeed, under both DEA variants, smaller cities tend to be less efficient than larger ones hence indicating that the quality of the frontier adjustment improves significantly as the size of the municipality increases. We present arguments that may explain to some extent these findings, such as economies of scale and the excess spending due to revenue from royalties. However, such effects require further, more careful examination.     

劳动禀赋结构和技术效应结构——贸易与工资差距研究范式新探

在回顾文献基础上,本文梳理出贸易影响工资差距的机制,认为在劳动供给结构不变的前提下,工资差距决定于劳动需求结构变动,而劳动禀赋结构和技术效应结构是研究两者关系的重要范式。劳动禀赋结构模型是在两国生产两种产品且技术水平相同的框架下,贸易品由于劳动禀赋结构不同,导致单位成本产出水平变动,进而影响劳动需求结构和工资差距;而技术效应结构模型则是在两国生产一种产品且技术水平不同的框架下,贸易品由于技术效应结构不同,导致相对工资和劳动需求关系曲线变动,进而影响劳动需求结构和工资差距,而且直接效应和间接效应的传导机制有很大差别。     

Dreaming of the West: The power of the brand in Soviet Lithuania, 1960s–1980s

Abstract

The article reveals the interest in foreign trademarks observed in Lithuanian society from the 1960s through the 1980s, when the demand for brand names spread after Western culture reached the Soviet Union. The consumption of Western cultural products, or imitations thereof, became one of the key symbolic expressions of freedom in Soviet society. In Lithuania, the most popular clothes were those bearing fake trademarks, even though Soviet authorities attempted to prevent the desire for and the wearing of these garments through the use of ideological tools.     

Who is who

Praxis / MagazinNews

Who is who     

Television-Induced Tourism: Evidence from Croatia

Atlantic Economic Journal - This paper analyzes the extent to which the filming of the popular television show Game of Thrones affected tourism in the Croatian city of Dubrovnik. Using monthly data...     

Fed funds futures variance futures

We develop a novel contract design, the fed funds futures (FFF) variance futures, which reflects the expected realized basis point variance of an underlying FFF rate. The valuation of short-term FFF variance futures is completely model-independent in a general setting that includes the cases where the underlying FFF rate exhibits jumps and where the realized variance is computed by sampling the FFF rate discretely. The valuation of longer-term FFF variance futures is subject to an approximation error which we quantify and show is negligible. We also provide an illustrative example of the practical valuation and use of the FFF variance futures contract.