2,329 research outputs found
Wi-Closure: Reliable and Efficient Search of Inter-robot Loop Closures Using Wireless Sensing
No full textIn this paper we propose a novel algorithm, Wi-Closure, to improve the computational efficiency and robustness of loop closure detection in multi-robot SLAM. Our approach decreases the computational overhead of classical approaches by pruning the search space of potential loop closures, prior to evaluation by a typical multi-robot SLAM pipeline. Wi-Closure achieves this by identifying candidates that are spatially close to each other measured via sensing over the wireless communication signal between robots, even when they are operating in non-line-of-sight or in remote areas of the environment from one another. We demonstrate the validity of our approach in simulation and in hardware experiments. Our results show that using Wi-closure greatly reduces computation time, by 54.1% in simulation and 76.8% in hardware experiments, compared with a multi-robot SLAM baseline. Importantly, this is achieved without sacrificing accuracy. Using Wi-closure reduces absolute trajectory estimation error by 98.0% in simulation and 89.2% in hardware experiments. This improvement is partly due to Wi-Closure's ability to avoid catastrophic optimization failure that typically occurs with classical approaches in challenging repetitive environments.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Learning & Autonomous Contro
WI Aids Safety
No full textNewspaper Article - 'WI Aids Safety' (Farm Safety - Reflector Tape) No dateAWI CollectionWI AIDS SAFETY — District roads in the
Echo Hill area, 35 miles northwest of Edmonton
are safer at night because of the Echo Hill
Women's Institute. Concerned over the hazards
posed by poorly marked machinery travelling
the roads, the WI raised $ 180 for nearly 200
yards of red reflective tape. With the aid of the
Echo Hill 4- H Club, the WI had the tape placed
in nearly 300 pieces of machinery along a 10-
mile portion of a district road. Official commendation
recently was given the project by the
Alberta Safety Council with an Outstanding
Achievement plaque. The picture shows Mrs.
William Price and Mrs. Lloyd McMillan, members
of the Echo Hill Women's Institute safety
committee, receiving the plaque from William
Perkins, the council's farm safety director
Distributed Multi-agent Negotiation for Wi-Fi Channel Assignment
No full textChannel allocation in dense, decentralized Wi-Fi networks is a challenging due to the highly nonlinear solution space and the difficulty to estimate the opponent’s utility model. So far, only centralized or mediated approaches have succeeded in applying negotiation to this setting. We propose the first two fully-distributed negotiation approaches for Wi-Fi channel assignment. Both of them leverage a pre-sampling of the utility space with simulated annealing and a noisy estimation of the Wi-Fi utility function. Regarding negotiation protocols, one of the approaches makes use of the Alternating Offers protocol, while the other uses the novel Multiple Offers Protocol for Multilateral Negotiations with Partial Consensus (MOPaC), which naturally matches the problem peculiarities. We compare the performance of our proposed approaches with the previous mediated approach, based on simple text mediation. Our experiments show that our approaches yield better utility outcomes, better fairness and less information disclosure than the mediated approach.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Interactive Intelligenc
Effect of using micropalm oil fuel ash as partial replacement of cement on the properties of cement mortar
No full textThis study investigates the effects of micropalm oil fuel ash (mPOFA) on compressive strength and pore structure of cement mortar. Various experimental techniques, such as compression test, isothermal calorimetry, mercury intrusion porosimetry, and X-ray diffraction, are performed to figure out the effect of using mPOFA as partial replacement of cement on the hydration of cement and determine its optimal replacement level to increase mechanical property of the mortar specimens. 10 wt.% of cement replacement with mPOFA is found to give the highest level of compressive strength, achieving a 23% increase over the control specimens after 3 days of curing. High K2O contents in mPOFA stimulate C3S in cement to form C-S-H at early ages, and high surface area of mPOFA acts as a nucleus to develop C-S-H. Also, small mPOFA particles and C-S-H formed by pozzolanic reaction fill the pores and lead to reduction in large capillary pores. In XRD analysis, a decrease in Ca(OH)2 and SiO2 contents with age confirmed a high pozzolanic reactivity of mPOFA
Il Commentario della vita di Giannozzo Manetti di Vespasiano da Bisticci (con un’edizione critica e commentata del testo)
No full textThis work consists in a critical edition and a historical and cultural analysis of the Commentario della vita di Giannozzo Manetti (henceforth Commentario), a work written by Vespasiano da Bisticci (1422-1498). We propose a rereading of it, ascribing the Commentario to an environment of opposition to the Medici’s regime, and we suppose a date of composition in the afterwards of the Pazzi conspiracy.
The Commentario has already been published twice: a first time by Pietro Fanfani in 1862 and a second time by Aulo Greco in 1976. However, both publications are somewhat imprecise from the philological point of view, and limited insofar as they are only based on one version of the Commentario: in reality there are six witnesses with numerous authorial variants, the analysis of which enriches the interpretation of the work. In our dissertation, we highlight that the Commentario is not a mere literary exercise by the author but conveys in fact contents of protest towards the gradual establishment of a Medici lordship in Florence, in contrast to what has hitherto been assumed. Such contents are however cautiously expressed by the author through recourse to Giannozzo Manetti’s biography. Manetti was indeed an important character of Fifteenth Century Florentine public life who showed his reluctance to submit to the centralization of state power in Cosimo the Elder’s hands
Use of an agricultural by-product, nano sized Palm Oil Fuel Ash as a supplementary cementitious material
No full textAn experimental study was conducted with objectives to find out the properties of nano sized Palm Oil Fuel Ash (nPOFA), which is a by-product of palm oil industry, and its effects on the hydration kinetics. The replacement ratios of nPOFA was set at 0-90%. Mortar and paste specimens containing nPOFA were prepared to study the effects of nPOFA on compressive strength and the microstructure. The results of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) indicated that the nPOFA mainly consists of SiO2 and its average size is 100-150 nm. There was an increase in compressive strength of mortar specimens by the incorporation of nPOFA. However, more than 40% of nPOFA caused the reduction in compressive strength. As curing age increases, the microstructure of the specimens with nPOFA became denser than the samples without nPOFA due to the refinement of microstructure. The reduction in Ca(OH)(2) from pozzolanic reaction and the further formation of C-S-H were confirmed by thermogravimetric analysis (TGA), XRD and FT-IR. On this basis, a schematic hydration mechanism of nPOFA in cement matrix was proposed, and it is anticipated that nPOFA could be used as eco-friendly cementitious materials. (c) 2018 Elsevier Ltd. All rights reserved.This work was supported by basic science research program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science, ICT and Future Planning (No. 2015R1A5A1037548)
Determine activity based on the classified identity of users by using Wi-Fi monitoring
No full textThe Wi-Fi technologies are used in everyday life on numerous applications that detect the crowd information for commercial, security and other reasons. The Wi-Fi monitoring can be used for tracking people when they are moving along different access points. The results from the Wi-Fi monitoring can provide the location of the users in an area and therefore, useful information can be extracted. The goal of this project is to recognize the activity of different users for different sessions of a Wi-Fi network. The Wi- Fi dataset that is used, is acquired from the Wi-Fi network of the Delft University of Technology (TU Delft). Initially, the estimation of the users’ occupation is determined with the use of a Markov model with the information that is derived from the Wi-Fi dataset. Their possible identity is used, in order to estimate the activity that a user is probably doing at a specific location of the research area. The results on the use of the research area, are calculated and visualised in different spatial levels, campus, building and floor level. The use of the building complex of the TU Delft Campus, is examined during irregular hours, to allow efficient real estate management and provide security solutions.Architecture and The Built EnvironmentGeo-information TechnologyGeomatics for the Built EnvironmentTRACK-i
Remote Control Car using Wi-Fi
No full textWireless Fidelity, Wi-Fi utilize one of the IEEE 802.11 wireless standards to achieve a
wireless network. In this project, author has to use Wi-Fi in controlling a Wi-Fi car.
The problem statement, objectives and scope of studies for this project will be further
explained in the first part of this report, the INTRODUCTION section. As for the
scope of study, author explores Wi-Fitechnologyitself and the information gained was
documented in LITERATURE REVIEW/THEORY chapter. The proposed
METHODOLOGY used in this project is discussed in the next section, including the
tools and software utilized in developing the system. As this project is meant to
develop author understanding on wireless network, the results of this project are
included in the RESULT AND DISCUSSION section. The last section,
CONCLUSION AND RECOMMENDATION will conclude author activities
throughout these two semesters and describe suggestions to enhance and overcome
flaws of this project. All references of this project can be referred in the
REFERENCES list.
Win Farm Safety Prize (Echo Hill WI - Reflector Tape)
No full textNewspaper Article - 'Win Safety Prize' (Echo Hill WI - Reflector Tape, March 12, 1960)AWI CollectionM- URDA. Y, MARCH 12, 1960
WIN SAFETY PRIZE — Mrs. W. B. H. Squair of Legal,
seated right, is a member of Echo Hill Women's Institute, a group
which Thursday received news that it had won the $ 500 second
prize in the annual Carol Lane safety awards. Mrs. Squair,
constituency convener for the WI in her area when the safety
project was undertaken, is in Edmonton this week and attended
a WI conference at the Corona Hotel Wednesday and Thursday.
She is pictured with Mrs. Harold Lefsrud of Viking, standing,
provincial health convener, and Mrs. G. D. Spargo of Alcomdale,
present constituency convener for mid- Pembina. To win the
safety prize, the 17 members of Echo Hill WI bought S180 worth
of red reflector tape and themeselves applied it to five farm
machines on each of 73 farms in a 40- square miles area. The
project was designed to prevent accidents involving farm machines
being moved on the roads from field to field. Left- over reflector
tape was sold to farmers in neighboring areas, who became
interested in the safety measure after hearing of the WI project.
Mrs. Lloyd McMillan is president of the branch, and the safety
project was her idea, Mrs. Squair says. Money for the project
had been raised at chicken suppers, bazaars, card parties and
sales of home baking. — Photo by Goertz Studios
WI told to embrace change
No full textNewspaper Article - 'WI told to embrace change' - By Mary MacArthur-Camrose bureau - June 19, 1998. Delegates at the Alberta Women's Institutes meeting in Camrose were told to change with the times.AWI CollectionWI told to embrace change
By Mary MacArthur
Camrose bureau
Marion Brown stood at the front of the convention
hall and asked the women if they could remember
when they were afraid to eat food
cooked in a microwave oven.
Then the Alberta Women's Institutes'
convener on agriculture education
asked how they feel today about
biotechnology and genetically altered
food.
Agriculture is changing, the world is
changing and Brown challenged the
women to find out as much as they can
about the changing world to help
them face the upcoming
changes to
theWI.
The Challenge of
Change was the
theme of the two-day
AWI convention
in Camrose.
Keynote speaker
Morris Flewwelling
said the women may
feel overwhelmed
with changes facing
their organization
established in 1909,
but change is nothing
new.
In the past 50
years homes have
gone from rotary
telephones to computers
and the in-
V ou have to
change the WI to
remain strong,
relevant and vital."
— MORRIS FLEWWELLING,
SPEAKER
WP photo by Mary MacArthur
DELEGATES AT THE ALBERTA WOMEN'S INSTITUTES MEETING IN
CAMROSE WERE TOLD TO CHANGE WITH THE TIMES.
ternet. Hospitals and libraries, once established by
Women's Institutes to help the community, are being
run by government- appointed boards and the rural
economy is tied to global happenings.
" The WI has been an engine on the
train in many areas of social change," said
Flewwelling, adding that the organization
must continue its community work.
" At no time in our history have we
needed people like you more."
With an aging membership and a
structure that hasn't changed much since
it was established, Flewwelling challenged
the women to adopt change within
their organization.
" You may have
to change the WI
in order to remain
strong, relevant
and vital. You may
have to change
your structure.
" You need an organization
that is
responsive, athletic
and loving."
President Doris
Northey of Red
Deer echoed Flew-welling's
remarks
that change is necessary.
" We will move
forward. We will
have regrets, but
we will move forward.
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