For time-sensitive applications requiring frequent data gathering from a remote wireless sensor network, it is a challenging task to design an efficient routing scheme that can minimize delay and also offer good performance in energy efficiency and network lifetime. In this paper, we propose a new data gathering scheme which is a combination of clustering and shortest hop pairing of the sensor ...

We propose a novel data collection architecture, called Ring-based Information Collection Architecture (RICA), for sensor networks. In the RICA scheme, sensors are organised into a ring. According to our study, the transmission delay time of data collection in a ring is only a half of that in PEGASIS, in which sensors are organised into a chain. We present a ring construction algorithm for RICA...

In this paper, we propose Privacy Profile Negotiation Protocol (PPNP) that is a protocol for applying user’s privacy profile to services in public spaces to protect users from theft and leakage of privacy profile. In public spaces, third parties can provide services. This may cause malicious services to exist, which handle privacy profiles illegally. Thus, unintended third parties know privacy ...

1.0 INTRODUCTION Much progress has been made in modeling trace gases such as ozone and ozone precursors; however, relatively large uncertainties are still associated with urban, regional, and global-scale model predictions of aerosols (mass, size distribution, composition, physical characteristics, and optical properties) and aerosol direct and indirect forcing. A key step in improving the repr...

Wireless Sensor Network (WSN) stands forefront in the scientific research community recently. WSNs are highly scattered selforganizing system and are deployed in various fields. Routing schemes have the common objective of trying to get better throughput with minimum delay and to prolong the lifespan of the sensor network. This paper mainly focused on brief technical introduction to WSN stack a...

Energy is the vital resource in the life of a wireless sensor node. So, its usage must be optimized to extend the network life. Routing protocols should also be concerned about the overhead energy which is wasted at each hop during data transfer. Main feature of routing protocol, I n order to be efficient wireless sensor networks, is the energy consumption and the extension of the network’s lif...

In this paper, we examine the issues of workflow mapping and execution in opportunistic environments such as the grid. As applications become ever more complex, the process of choosing the appropriate resources and successfully executing the application components becomes ever more difficult. In this paper, we focus on the interplay between a workflow mapping component that plans the high-level...

We have developed a portable, motorized, multi-shot, third-order autocorrelator capable of measuring the time width of a large bandwidth pulse with femtosecond acuracy. Here we give a detailed description of the device and report measurements made in the Pegasus laboratory on a Coherent Legend Elite laser system, generating a short pulse, (IR) λ = 800nm E < 3mJ , and a frequency tripled pulse, ...

The evolution of airborne lidar mapping systems has been largely driven toward ever-increasing laser pulse repetition frequencies (PRF) for higher density model applications. The greater pulse rates increase the density of points on the ground, providing a higher resolution and detailed representation of the target surface. In combination with an appropriate scanning system, they can provide mo...