Seiichiro Ishikawa

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The Delay/Disruption Tolerant Networking (DTN) aims to provide inter-operable communications with wide range of networks which can have poor performance characteristics. In this paper, we investigate the performance of epidemic routing protocol of Vehicular DTN under urban environment. The simulations for two scenarios are conducted considering obstacles(More)
The Delay/Disruption Tolerant Networking (DTN) aims to provide inter-operable communications with wide range of networks which have poor performance characteristics. In this paper, we propose a message suppression method for Vehicular DTN (VDTN) under highly stressed environment. The simulations for two scenarios are conducted considering obstacles(More)
In this paper, we propose a Message Suppression Controller (MSC) for Vehicular Delay Tolerant Networking (VDTN) under highly stressed environment. The simulations for two scenarios are conducted considering obstacles (buildings), where MSC with Road side units (MSCRs) are present or not present. We consider 802.11p standard and send bundle messages in a(More)
The Delay/Disruption Tolerant Networking (DTN) aims to provide inter-operable communications with wide range of networks which have poor performance characteristics. In previous work, we proposed a message suppression method for Vehicular-DTN (VDTN) considering UDP traffic. In this paper, we evaluate the proposed method for VDTN considering TCP traffic. The(More)
In our previous work, we proposed a method of Message Suppression Controller (MSC) considering Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communications. In this paper, we evaluate the proposed MSC method for Vehicular Delay Tolerant Networking (VDTN). The simulations for two scenarios are conducted considering obstacles (buildings), where(More)
In our previous work, we proposed a method of Message Suppression Controller (MSC) considering Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communications. In this paper, we propose an Enhanced Message Suppression Controller (EMSC) for Vehicular-Delay/Disruption Tolerant Networking (V-DTN). The simulations for two scenarios are conducted(More)
The impact of large-scale grid-connected PV (photovoltaics) on power system transient stability is discussed in this paper. In response to an increase of PV capacity, the capacity of conventional synchronous generator needs to be reduced relatively. This leads to the lower system inertia and the higher generator reactance, and hence, the power system(More)
The Delay/Disruption Tolerant Networking (DTN) aims to provide inter-operable communications with wide range of networks which have poor performance characteristics. In this paper, we propose a message suppression method for Vehicular DTN (VDTN). The simulations for two scenarios are conducted considering obstacles (buildings), where Message Suppression(More)
In previous work, we proposed a Message Suppression (MS) method for Vehicular Delay Tolerant Networking (Vehicular-DTN) considering Epidemic routing protocol. In this paper, we evaluate our proposed MS method considering three different DTN routing protocols under highly stressed environment. In order to evaluate the performance of MS method, we use Direct(More)
Human or face tracking in a diverse environment is very important for various applications in computer vision, especially for video surveillance. Usually, a color cue offers many advantages over motion or geometric information which cannot robustly handle partial occlusion, rotation, scale and resolution changes. In this paper, we present a robust face(More)