This paper examines the development pattern of the DEA (Data Envelopment Analysis) research field using Social Network Analysis. Nine stylized facts are verified: it is shown that the distribution of research performance is highly skewed, satisfying a power law, and that collaborative research...

We empirically analyze both free and paid products on the top 100 Free and Grossing charts in the Korea App Store using Weibull parametric survival analysis on the product level. The findings are as follows: First, influences of ranking, customer ratings, and contents size on product survival...

We propose a competitiveness index for the electricity industry based on efficiency, stability, and growth factors identified from previous studies subject to data accessibility. These are then weighted appropriately through the application of the analytical hierarchy process. This index is an...

The Korean economy severely suffered from the Asian financial crisis, and is well known for rapid recovery in the years following. However, the recovery was mainly due to successful restructuring by a limited number of large-sized enterprises (LSEs). The small and medium sized enterprises (SMEs)...

An electron beam melting (EBM) system was fabricated to investigate its effectiveness in the refining of metallurgical grade silicon. The metallurgical refining of silicon is a promising process for reducing the production cost of silicon feedstock for solar cells. Especially, EBM is an...

We calculate the mean neighboring degree function <InlineEquation ID="Equ1"> <EquationSource Format="TEX">$\bar k_{\rm{nn}}(k)$</EquationSource> </InlineEquation> and the mean clustering function C(k) of vertices with degree k as a function of k in finite scale-free random networks through the static model. While both are independent of k when the degree exponent γ≥3, they show...</equationsource></inlineequation>

A photovoltaic (PV) power conditioning system (PCS) must have high conversion efficiency and low cost. Generally, a PV PCS uses either a single string converter or a multilevel module integrated converter (MIC). Each of these approaches has both advantages and disadvantages. For a high...

One of the main topics regarding R&D investment in economics is “R&D market failure”. This is imputed that knowledge, which is the primary output of R&D, has spillover effects due to its public-good-like properties. It cause incomplete appropriability of innovating firm and will lead the...

In a highly competitive environment a product’s commercial success depends increasingly more upon the ability to satisfy consumers’ preferences that are highly diversified. Since a consumer product typically comprises a host of technological attributes, its market value incorporates all of...