Using DEA and Network Centrality to Measure Influence and Rank of Korean Stock Funds
Data envelopment analysis (DEA) is known as a useful tool which produces many efficient decision-making units (DMUs). Traditional DEA provides relative efficient scores and reference sets, but does not influence and rank for efficient DMUs. This paper suggests a method that provides influence and ranking information using PageRank centrality of Social Network analysis (SNA) based on reference sets and their lambda value. The social network structure expresses the DMU as a node, reference sets as link, and lambda as connection strength or weight. This paper shows PageRank centrality is more accurate than any others.
A Relative Importance Among Critical Success Factors For ERP Implementation: A Content Analysis
Enterprise Resource Planning ((ERP) systems have been widely adopted in various business areas in last 20 years. Though there are many benefits of ERP systems, ERP systems implementation is a daunting task with high failure rate. There were many studies to identify critical success factors (CSFs) to manage risks inherent in ERP systems implementation. These studies have collected and described what these CSFs are by compiling anecdotal CSFs from various literatures. In this study, these compiled CSFs are ranked by a content analysis with empirical literature to understand relative importance among these factors to help ERP implementers allocate implementation efforts and limited resources appropriately. The result of the content analysis reveals that Minimum Customization of ERP systems is ranked atop. Customization of ERP system is almost certain for any implementation. This is because general functionality of the ‘best practice’ of ERP system by a vendor and specific business requirements of organization’s legacy systems need to be mutually integrated into each other, which mandates the customization of ERP systems. Therefore, a tight project management of the technical complexity of customization process is a key for a successful ERP implementation. The study concludes that the goal of the customization process of an ERP system is to achieve the organizational fit between organizational needs and ERP system’s capabilities.
Spectroscopy of high rate events during active interrogation
Abstract Pulsed accelerators are being used for radiographic inspections in homeland security applications. Adding spectroscopic detection capability enables additional information to be extracted but challenges signal processing hardware. This work compares two approaches to cost-effective digital spectroscopy systems designed to handle these high rate scenarios. In the first system, the signal from a PMT is directly digitized and then deconvolved on a PC using standard techniques. Bypassing the preamplifier, this system can handle high count rates (>10 6  cps) from an LaCl 3 detector with no dead time and an energy resolution of 5% at 1.33 MeV. Spectra acquired from fission product gamma rays between interrogation pulses are shown. At higher rates, this approach is limited by the DAQ transfer rate to the PC. Instead, we tested a fast ADC (125 MSPS) and an FPGA that performed onboard, real-time digital signal processing (DSP). The energy spectrum is generated on the FPGA board during the measurement and transferred later. This system was tested in nuclear resonance fluorescence (NRF) experiments. Resonance peaks from NRF reactions are shown.