In this paper, we propose an adaptive and opportunistic forwarding mechanism that is able to match mobility characteristics in Delay Tolerant Networks (DTNs). Our protocol, Seeker, empowers nodes with the ability to estimate future contact opportunities based on a history of pair-wise contacts. Furthermore, Seeker is able to adjust and rewind forwarding and buffering decisions on the fly. This ...

retrieval? It is legitimate for the reader to ask why a distinction is made by this book between the terms ‘interactive information retrieval’ and ‘information retrieval’. Surely, in the current context of information seeking through web search engines, it is clear that information retrieval necessarily involves some form of interaction between searcher and system. An answer to this question li...

The accuracy of target position detection in IR seeker depends on the accuracy of tracking error signal (TES) extraction from seeker Field of View (FOV). The type of reticle inside the seeker determines the output modulation signal that carries the TES. In this paper, the stationary wagon wheel reticle is used, which makes the type of the output signal as FM modulation in the linear region of F...

Ross-Hime Designs, Inc. presents the results of its research and development of “Low Cost Light-Weight Seeker Gimbals.” The Super Seeker, a patent-pending gimbal design, offers a swiveling yoke design lower in cost than current gimbal designs and weighing significantly less than traditional gimbal systems while enabling a doubling of the sensor’s surface area. The swiveling yoke design has buil...

The system of asylum seeker detention in Australia is one in which those seeking refuge are stripped of many of their rights, including the right to health. This presents serious ethical problems for healthcare providers working within this system. In this article we describe asylum seeker detention and analyse the role of nurses. We discuss how far an "ethics of care" and witnessing the suffer...

This paper provides a management overview of a new joint Navy/Army millimeter wave (MMW) seeker technology development initiative. The goal of the program is to provide advanced seeker components for endoatmospheric interceptors for theater and strategic missile defense. The technologies are driven by requirements for low weight/volume interceptors, high interceptor and target velocities and a ...

The tomographic scanning (TOSCA) imaging seeker concept is presented. The system is based on conical scan reticle seeker optics modified with an eccentrically rotating circular aperture. After signal preprocessing, an image is extracted using tomography reconstruction techniques. Simulation results are provided to show the reconstruction quality. The concept, using a single pixel and a simple r...

The majority of homing guided missiles use gimbaled seekers. The equations describing seeker gimbal system are highly nonlinear. Accurate nonlinear control of the motion of the gimbaled seeker through the attached DC motors is required. In this paper, an online technique for finite-horizon nonlinear tracking problems is presented. The idea of the proposed technique is the change of variables th...

This paper presents a seeker algorithm for solving the multi-objective reactive power dispatch problem. Swarm intelligence algorithms have been productively applied to hard optimization problems. Seeker optimization algorithm is one of the latest members of that class of metaheuristics and the primary type of this algorithm was less successful with multimodal functions. We propose hybridization...