70 research outputs found
Robotic Wireless Sensor Networks
In this chapter, we present a literature survey of an emerging, cutting-edge,
and multi-disciplinary field of research at the intersection of Robotics and
Wireless Sensor Networks (WSN) which we refer to as Robotic Wireless Sensor
Networks (RWSN). We define a RWSN as an autonomous networked multi-robot system
that aims to achieve certain sensing goals while meeting and maintaining
certain communication performance requirements, through cooperative control,
learning and adaptation. While both of the component areas, i.e., Robotics and
WSN, are very well-known and well-explored, there exist a whole set of new
opportunities and research directions at the intersection of these two fields
which are relatively or even completely unexplored. One such example would be
the use of a set of robotic routers to set up a temporary communication path
between a sender and a receiver that uses the controlled mobility to the
advantage of packet routing. We find that there exist only a limited number of
articles to be directly categorized as RWSN related works whereas there exist a
range of articles in the robotics and the WSN literature that are also relevant
to this new field of research. To connect the dots, we first identify the core
problems and research trends related to RWSN such as connectivity,
localization, routing, and robust flow of information. Next, we classify the
existing research on RWSN as well as the relevant state-of-the-arts from
robotics and WSN community according to the problems and trends identified in
the first step. Lastly, we analyze what is missing in the existing literature,
and identify topics that require more research attention in the future
Results from the Baksan Experiment on Sterile Transitions (BEST)
The Baksan Experiment on Sterile Transitions (BEST) was designed to
investigate the deficit of electron neutrinos, , observed in previous
gallium-based radiochemical measurements with high-intensity neutrino sources,
commonly referred to as the \textit{gallium anomaly}, which could be
interpreted as evidence for oscillations between and sterile neutrino
() states. A 3.414-MCi \nuc{51}{Cr} source was placed at the
center of two nested Ga volumes and measurements were made of the production of
\nuc{71}{Ge} through the charged current reaction,
\nuc{71}{Ga}(,e)\nuc{71}{Ge}, at two average distances. The measured
production rates for the inner and the outer targets respectively are
(54.9^{+2.5}_{-2.4}(\mbox{stat})\pm1.4 (\mbox{syst})) and
(55.6^{+2.7}_{-2.6}(\mbox{stat})\pm1.4 (\mbox{syst})) atoms of
\nuc{71}{Ge}/d. The ratio () of the measured rate of \nuc{71}{Ge} production
at each distance to the expected rate from the known cross section and
experimental efficiencies are and .
The ratio of the outer to the inner result is 0.970.07, which is
consistent with unity within uncertainty. The rates at each distance were found
to be similar, but 20-24\% lower than expected, thus reaffirming the anomaly.
These results are consistent with oscillations with a
relatively large (0.5 eV) and mixing sin
(0.4).Comment: Paper updated to final versio
Commissioning of inline ECE system within waveguide based ECRH transmission systems on ASDEX upgrade
A CW capable inline electron cyclotron emission (ECE) separation system for feedback control, featuring oversized corrugated waveguides, is commissioned on ASDEX upgrade (AUG). The system is based on a combination of a polarization independent, non-resonant, Mach-Zehnder diplexer equipped with dielectric plate beam splitters [2, 3] employed as corrugated oversized waveguide filter, and a resonant Fast Directional Switch, FADIS [4, 5, 6, 7] as ECE/ECCD separation system. This paper presents an overview of the system, the low power characterisation tests and first high power commissioning on AUG
Telerobotic Pointing Gestures Shape Human Spatial Cognition
This paper aimed to explore whether human beings can understand gestures
produced by telepresence robots. If it were the case, they can derive meaning
conveyed in telerobotic gestures when processing spatial information. We
conducted two experiments over Skype in the present study. Participants were
presented with a robotic interface that had arms, which were teleoperated by an
experimenter. The robot could point to virtual locations that represented
certain entities. In Experiment 1, the experimenter described spatial locations
of fictitious objects sequentially in two conditions: speech condition (SO,
verbal descriptions clearly indicated the spatial layout) and speech and
gesture condition (SR, verbal descriptions were ambiguous but accompanied by
robotic pointing gestures). Participants were then asked to recall the objects'
spatial locations. We found that the number of spatial locations recalled in
the SR condition was on par with that in the SO condition, suggesting that
telerobotic pointing gestures compensated ambiguous speech during the process
of spatial information. In Experiment 2, the experimenter described spatial
locations non-sequentially in the SR and SO conditions. Surprisingly, the
number of spatial locations recalled in the SR condition was even higher than
that in the SO condition, suggesting that telerobotic pointing gestures were
more powerful than speech in conveying spatial information when information was
presented in an unpredictable order. The findings provide evidence that human
beings are able to comprehend telerobotic gestures, and importantly, integrate
these gestures with co-occurring speech. This work promotes engaging remote
collaboration among humans through a robot intermediary.Comment: 27 pages, 7 figure
- …