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We propose two methods for improving the stability of communication in ad hoc wireless networks - firstly, the selection of reliable neighbors for data relay based on monitoring signal strength variations and secondly, the synchronous update of routing tables. These methods were designed to overcome problems observed in recent large testbed experiments. We(More)
Our ultimate goal is to develop an information diffusion system where individuals are motivated to create content and share it with public. As our first step, in this paper, we present an incentive-rewarding mechanism for social networking services and focus particularly on changing reward assignment ratio considering different risks users perceive when(More)
A problem in the social-network-based intaraction distribution is that people are less motivated to forward information when psychological forwarding cost is large. The simplest solution for this is to compensate for the cost by giving people incentive reward when they forward information. However, it is unclear that, even if we successfully propagate(More)
We demonstrate a method for improving quality of ad-hoc multihop wireless communications between moving vehicles. This method is designed to overcome problems of high packet loss and route instability common in inter-vehicular communications. We implemented the proposed method as middleware supporting real-time packet transmissions such as VoIP, and(More)
We study latency fluctuation during UDP packet exchange in ad hoc wireless groups. We focus on wireless media access using carrier sensing multiple access with collision avoidance, specifically the 802.11 protocol. We show that there can be large intermittent fluctuations in transmission times when packet exchange is done using UDP unicast. We show how the(More)
Channel detection is necessary for control of channel usage in multi-user and multi-channel wireless networks. In this paper, we propose a real time wireless channel detection method based on measuring fluctuations of packet arrival intervals in networks using IEEE802.11 media access protocol. We have used simulations to show the relationship between the(More)
This paper describes the development of a Symbiotic Service Guidance (SSG) system, and its application to a multi-modal transport system. The basic idea of symbiotic service guidance is to provide guidance to both service users and service providers in a way which supports the adaptation of supply and demand toward mutually satisfactory states. In this(More)