Pricing schemes for Internet services have turned out to be of crucial influence for the competitiveness of Internet Service Providers (ISP). Despite of this urgent demand, there is still no standard tariff scheme that solves the so-called “feasibility problem”, i.e. ensures simultaneously technical feasibility, economic efficiency and user acceptance. This paper investigates the reason for the...

Sweet sorghum is a popular grain crop grown in water stress prone areas in the world. Its sole stand leaves ample resources untapped. This study evaluated the feasibility of intercropping sweet sorghum using eight intercropping patterns composed of 2 x 2 x 2 factorial combinations of two legumes (viz. mung bean and soybean), two row patterns [viz. alternate single row (ASR) and double row (ADR)...

‎an  oriented perfect path double cover (oppdc) of a‎ ‎graph $g$ is a collection of directed paths in the symmetric‎ ‎orientation $g_s$ of‎ ‎$g$ such that‎ ‎each arc‎ ‎of $g_s$ lies in exactly one of the paths and each‎ ‎vertex of $g$ appears just once as a beginning and just once as an‎ ‎end of a path‎. ‎maxov{'a} and ne{v{s}}et{v{r}}il (discrete‎ ‎math‎. ‎276 (2004) 287-294) conjectured that ...