Hisashi Tamaki

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This article introduces a coevolutionary approach to genetic algorithms (GAs) for exploring not only within a part of the solution space defined by the genotype-pheno-type map, but also the map itself. In canonical GAs with a fixed map, how large an area of the solution space can be covered by possible genomes, and consequently how better solutions can be(More)
In this paper, we consider an extended class of flexible job shop scheduling problems. First, we translate the problem into a mathematical programming formula, i.e., a mixed-integer programming problem. This makes it possible to apply standard packages of mixed integer programming solvers and, while lots of computational time is required in general, to(More)
Femtocell is an emerging technology that promises increased network capacity and enhanced indoor coverage at a low capital and operational cost. However, macrocell network performance depreciates when macrocell users (mUEs) are located indoors with femtocell base stations (FBSs), and these users are not allowed access to the FBSs (closed access). This is a(More)
This paper addresses the problem of fair radio resource partitioning between the cell-edge and cell-center regions in the context of the downlink of a SISO-OFDMA cellular system. Although, a plethora of studies concerning OFDMA-based radio resource allocation exists, it is, however, imperative to accord special attention to the proper design of network(More)