10,571 research outputs found
Connectionless indoor inventory tracking in Zigbee RFID sensor network
Abstract: Zigbee is one of the most exciting wireless sensor
network (WSN) technologies for monitoring and control. In our
previous research, an integrated Zigbee RFID sensor network
was designed as an ‘all-in-one’ system solution for
Humanitarian Logistics Center (HLC) resource management.
Various field trials, which have justified the feasibility and
features of such a system structure, have also revealed the
requirement for simple yet reliable mobile tracking architecture
for Zigbee network. In this paper a connectionless tracking
architecture based on Zigbee RFID sensor network is proposed
for inventory management applications. Such architecture
features a consistent network structure, low hardware energy
consumption and no accumulated error for localization
algorithms with the least additional cost and hardware required
on top of the existing Zigbee RFID sensor network systems. A
simple demo system is also developed to demonstrate the
feasibility of our design
A robot swarm assisting a human fire-fighter
Emergencies in industrial warehouses are a major concern for fire-fighters. The large dimensions, together with the development of dense smoke that drastically reduces visibility, represent major challenges. The GUARDIANS robot swarm is designed to assist fire-fighters in searching a large warehouse. In this paper we discuss the technology developed for a swarm of robots assisting fire-fighters. We explain the swarming algorithms that provide the functionality by which the robots react to and follow humans while no communication is required. Next we discuss the wireless communication system, which is a so-called mobile ad-hoc network. The communication network provides also the means to locate the robots and humans. Thus, the robot swarm is able to provide guidance information to the humans. Together with the fire-fighters we explored how the robot swarm should feed information back to the human fire-fighter. We have designed and experimented with interfaces for presenting swarm-based information to human beings
GUARDIANS final report part 1 (draft): a robot swarm assisting a human fire fighter
Emergencies in industrial warehouses are a major concern for fire fighters. The large dimensions together with the development of dense smoke that drastically reduces visibility, represent major challenges. The Guardians robot swarm is designed to assist re ghters in searching a
large warehouse. In this paper we discuss the technology developed for a swarm of robots assisting re ghters. We explain the swarming algorithms which provide the functionality by which the robots react to and follow humans while no communication is required. Next we discuss the wireless communication system, which is a so-called mobile ad-hoc network. The communication network provides also the means to locate the robots and humans. Thus the robot swarm is able to provide guidance information to the humans. Together with the fire fighters we explored how
the robot swarm should feed information back to the human fire fighter. We have designed and experimented with interfaces for presenting swarm based information to human beings
Networking Solutions for Integrated Heterogeneous Wireless Ecosystem
As wireless communications technology is steadily evolving to improve the offered connectivity levels, additional research on emerging network architectures is becoming timely to understand the applicability of both traditional and novel networking solutions. This chapter concentrates on the utilization of cloud computing techniques to construct feasible system prototypes and demonstrators within the rapidly maturing heterogeneous wireless ecosystem. Our first solution facilitates cooperative radio resource management in heterogeneous networks. The second solution enables assisted direct connectivity between proximate users. The contents of the chapter outline our corresponding research and development efforts as well as summarize the major experiences and lessons learned
GUARDIANS final report
Emergencies in industrial warehouses are a major concern for firefghters. The large dimensions together with the development of dense smoke that drastically reduces visibility, represent major challenges. The Guardians robot swarm is designed to assist fire fighters in searching a
large warehouse. In this report we discuss the technology developed for a swarm of robots searching and assisting fire fighters. We explain the swarming algorithms which provide the functionality by which the robots react to and follow humans while no communication is required. Next we
discuss the wireless communication system, which is a so-called mobile ad-hoc network. The communication network provides also one of the means to locate the robots and humans. Thus the robot swarm is able to locate itself and provide guidance information to the humans. Together with
the re ghters we explored how the robot swarm should feed information back to the human fire fighter. We have designed and experimented with interfaces for presenting swarm based information to human beings
Get yourself connected: conceptualising the role of digital technologies in Norwegian career guidance
This report outlines the role of digital technologies in the provision of career guidance. It was commissioned by the c ommittee on career guidance which is advising the Norwegian Government following a review of the countries skills system by the OECD. In this report we argue that career guidance and online career guidance in particular can support the development of Norwa y’s skills system to help meet the economic challenges that it faces.The expert committee advising Norway’s Career Guidance Initiativ
Conflict-Free Replicated Data Types in Dynamic Environments
Over the years, mobile devices have become increasingly popular and gained improved
computation capabilities allowing them to perform more complex tasks such as
collaborative applications. Given the weak characteristic properties of mobile networks,
which represent highly dynamic environments where users may experience regular involuntary
disconnection periods, the big question arises of how to maintain data consistency.
This issue is most pronounced in collaborative environments where multiple users interact
with each other, sharing a replicated state that may diverge due to concurrency
conflicts and loss of updates.
To maintain consistency, one of today’s best solutions is Conflict-Free Replicated Data
Types (CRDTs), which ensure low latency values and automatic conflict resolution, guaranteeing
eventual consistency of the shared data. However, a limitation often found on
CRDTs and the systems that employ them is the need for the knowledge of the replicas
whom the state changes must be disseminated to. This constitutes a problem since it is
inconceivable to maintain said knowledge in an environment where clients may leave
and join at any given time and consequently get disconnected due to mobile network
communications unreliability.
In this thesis, we present the study and extension of the CRDT concept to dynamic
environments by introducing the developed P/S-CRDTs model, where CRDTs are coupled
with the publisher/subscriber interaction scheme and additional mechanisms to
ensure users are able to cooperate and maintain consistency whilst accounting for the
consequent volatile behaviors of mobile networks. The experimental results show that
in volatile scenarios of disconnection, mobile users in collaborative activity maintain
consistency among themselves and when compared to other available CRDT models, the
P/S-CRDTs model is able to decouple the required knowledge of whom the updates must
be disseminated to, while ensuring appropriate network traffic values
Mobility, Career Pathways, and the Landscape of Employer and Youth Engagement in the South
It's tough for a southern kid born at the bottom of the income ladder to get ahead. Overcoming regional economic hardship, long-tolerated racial inequity and subpar education infrastructure is almost impossible. But there is progress. This issue brief examines two key elements connecting southern young adults with rewarding employment opportunities: employer and youth engagement. The brief offers a framework to assess the preconditions for effectively engaging employers and young adults and identifies examples of promising efforts. It also considers what philanthropy can do to reinforce the importance of employer and youth engagement and expand the use of both in the South
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