Junji Kitamichi

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A novel combinatorial optimization algorithm called “Gradual neural network (GNN)” is presented for NPcomplete broadcast scheduling problems in packet radio (PR) networks. A PR network provides data communications services to a set of geographically distributed nodes through a common radio channel. A time division multiple access (TDMA) protocol is adopted(More)
A novel neural network approach called gradual neural network (GNN) is presented for segmented channel routing in field programmable gate arrays (FPGA's). FPGA's contain predefined segmented channels for net routing, where adjacent segments in a track can be interconnected through programmable switches for longer segments. The goal of the FPGA segmented(More)
After a decade of extensive research on application-specific wireless sensor networks (WSNs), the recent development of information and communication technologies make it practical to realize new WSNs paradigm known as software-defined sensor networks (SDSNs). SDSNs are able to adapt to various application requirements and to fully explore the(More)
We propose a software-defined wireless sensor network system whose behavior can be redefined even after deployment by the injection of sensor node roles by means of wireless network communications. Two main technologies are used to develop this system, role generation and delivery mechanism, and a reconfigurable wireless sensor network with many(More)
According to the progress of high-speed networks, many communication protocols are specified as concurrent systems. Such systems can be modeled as concurrent deterministic FSMs (DFSMs). In those protocols, a common input may be taken by some of concurrent DFSMs competitively. In such a case, the global behaviour becomes non-deterministic in general.(More)
A novel neural network approach called "Evolutionary Neural Network (ENN)" is presented for the module orientation problem. The goal of this NP-complete problem is to minimize the total wire length by flipping circuit modules with respect to their vertical and/or horizontal axes of symmetry. In order to achieve high quality VLSI systems, it is strongly(More)
A gradual neural network (GNN) algorithm is presented for the jointly time-slot/code assignment problem (JTCAP) in a packet radio network in this paper. The goal of this newly defined problem is to find a simultaneous assignment of a time-slot and a code to each communication link, whereas time-slots and codes have been independently assigned in existing(More)
In this paper, we propose a wireless sensor network (WSN) whose behavior can be dynamically customized by injecting programs or roles specified by the user. To enable easy specification of the roles, a role-generation mechanism is also proposed. To realize the WSN, we introduce a reconfigurable wireless sensor node that has an ultra-low-power(More)