Fast Dual-Radio Cross-Layer Handoffs in Multi-Hop Infrastructure-mode 802.11 Wireless Networks for In-Vehicle Multimedia Infotainment

Minimizing handoff latency and achieving near-zero packet loss is critical for delivering multimedia infotainment applications to fast-moving vehicles that are likely to encounter frequent handoffs. In this paper, we propose a dual-radio cross-layer handoff scheme for infrastructure-mode 802.11 Wireless Networks that achieve this goal. We present performance results of an implementation of our algorithm in a Linux-based On-Board-Unit prototype.Comment: Presented (oral) at IEEE Advanced Networking and Telecommunications, 2008 (ANTS 2008) Conference (http://www.antsconference.org) held at Indian Institute of Technology, Mumbai. Awarded Best Paper (Honorable Mention

Radial and non-radial decompositions of profit change: an application

Grifell-Tatje and Lovell (1999) made a contribution to the literature by decomposing profit change in extended radial DEA framework into six mutually exclusive components. Their approach appears to suffer from two shortcomings. First, radial models do not achieve full efficiency when slacks are present, and therefore, the contributions of each of these components are grossly underestimated. Second, evaluations of these components, using base-period prices as weights, can be potentially misleading. To circumvent over these shortcomings, we, first, introduce non-radial DEA models, and second, provide strong theoretical argument in favor of either current-period prices/average price of both periods as weights to be used to value the contributions of each of these components. The Indian banking sector is taken as a case study to illustrate the radial and non-radial decompositions of profit change so as to empirically examine the role of competition on profit change as well as its six mutually exclusive components. Our broad empirical results are as follows: First, radial and non-radial models yield diametrical opposite sign on the contributions of various components. Second, the increasing efficiency change trend in all ownership groups after 2002 indicates an affirmative gesture about the effect of the reform process on the performance of the Indian banking sector. Third, despite the fact that nationalized banks are the oldest banks, they do not reflect their learning experience in their output-and resource allocation behaviors.http://www.grips.ac.jp/list/facultyinfo/tone_kaoru

Nonparametric and Parametric Measures of Scale Elasticity: A Comparative Evaluation

In any competitive set up, policy recommendations based on elasticity parameters have assumed greater significance for the firm\u27s financial viability and success. So there is a need to examine with more prudence the elasticity estimates obtained from various parametric as well nonparametric methods. The main aim of this paper is first to critically examine these methods in order to shed light on what seems to be missing, and then to proceed by developing an empirically demanding ecompassing measure of scale elasticity. All these measures, which are finally applied to a panel data of US electric companies, constitute the empirical premise of this paper.Research supported by Grant-in-Aid for Scientific Research (C) Japan Society for the Promotion of ScienceFirst version: "A Comparative Evaluation of Parametric and Nonparametric Methods to Estimating Degree of Scale Economies" Tone, Kaoru; Sahoo, Biresh K., 2002/7/31http://www.grips.ac.jp/list/facultyinfo/tone_kaoru