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Nanoscale cobalt oxide (Co 3 O 4 ) particles are produced on three-dimensional nickel/silicon microchannel plates (Ni/Si-MCPs) as the active electrode materials in miniature supercapacitors. The Co 3 O 4 nano-flakes are fabricated on the surface and interior of the Ni/Si-MCPs by annealing the nano-structured Co(OH) 2 /Ni/Si-MCPs, and the electrical conductivity...
Manganese-dioxide is electrodeposited on three-dimensional nickel/silicon microchannel plates (Si-MCPs) to produce miniature supercapacitors. The nanostructured MnO 2 thin film can be clearly observed from the channels and largely contribute to the capacitance. The compositions and morphology are characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM)...
In situations where cellular networks are either unavailable or in outage, a temporary multi-hop wireless network (MWN) can be instantiated and services such as video streaming can be valuable for various purposes. The interference and limitation of bandwidth however challenge the streaming quality in MWNs. To ensure the quality of service (QoS), it is necessary to apply admission control to video...
Vehicular ad hoc network is a kink of open wireless network. Due to this kind opening, it may face many serious security and privacy challenges. Recently, Kim et al proposed an efficient anonymous authentication protocol with tracing to enhance efficiency of anonymous authentication protocol. Unfortunately, in this paper, we show the protocol is insecure by analyzing the security of the scheme, it...
Anonymous receiver encryption is an important cryptographic primitive. It can protect the privacy of the receiver. In 2010, Fan \emph{et al} proposed an anonymous multi-receiver ID-based encryption by using Lagrange interpolating polynomial. However, Wang \emph{et al} showed that Fan \emph{et al}'s scheme didn't satisfy the anonymity of the receivers. Then they provided an improved scheme to fix it...
As an important delegation technique, proxy signature was introduced in 1996 by Mambo, Usud a, and Okamoto. And any variants of proxy signature schemes have been proposed. In some cases, to protect privacy of proxy signer, the identity of proxy signer is hidden. Recently, to satisfy the requirement of proxy signer's privacy protection, Hu \emph{et.al} gave an enhanced ID-based anonymous proxy signature...
Traffic congestion has become a global problem in urban areas, resulting in a great waste of time and fuel every year. Thus, the real-time detection for road congestion becomes a great challenge for both scientists and engineers. Recently, the technology of vehicular ad-hoc networks (VANETs) has been utilized to alleviate this problem, and becomes an important component of the intelligent transportation...
Finding suitable multi-hop routing paths for video streaming remains a challenging issue for 802.11 based multihop wireless networks. In this paper, we present an analytical approach that takes cross-layer factors into account and propose a new routing metric based on optimizing a queueing model that considers local data transmission rates, interference and packet drop rates. Simulation results using...
In highway environment, many safety-related applications demand localization. Currently, localization is usually achieved by on-vehicle GPS. However, it requires that each car has a GPS device, which increases vehicle's cost and restricts the scope of some applications to some extent. The road side unit (RSU) is a fix infrastructure to collect information, enhance road safety and indicate navigations,...
In VANET, vehicles moving on the highway usually form clusters, and the wireless communications between vehicles are generally conducted by cluster heads. In most cluster-based protocols, however, the cluster head selection carried out through inter-cluster communications has some limitations, e.g., large communication and computation cost, quite complex algorithms, requirement of additional devices...
Urban traffic congestion has become a global phenomenon in recent years, resulting in a great waste of time and fuel. Thus, it is a great challenge for both scientists and engineers to detect the road condition timely and accurately. The technology of vehicular ad-hoc networks (VANETs) applied in intelligent transportation system (ITS) is a new promising approach to alleviate this problem. In this...
Vehicle traffic congestion has become a serious urban phenomenon in recent years, resulting in a large number of negative effects both on economy and ecology. Thus, finding a way to detect traffic congestion is a highly urgent problem to be solved by scientists and politicians throughout the world. One new promising approach is the usage of vehicular ad-hoc network (VANET). In this paper, we study...
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