scholarly journals Effect of User Mobility upon Trust Building among Autonomous Content Routers in an Information-Centric Network

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Jerzy Konorski ◽  
Jakub Grochowski
Keyword(s):  
Autonomous Agents ◽  
High Mobility ◽  
Mobility Model ◽  
Trust Building ◽  
User Mobility ◽  
Negative Effect ◽  
Current Content ◽  
Content Availability ◽  
The One ◽  
Willingness To Cooperate

The capability of proactive in-network caching and sharing of content is one of the most important features of an information-centric network (ICN). We describe an ICN model featuring autonomous agents controlling the content routers. Such agents are unlikely to share cached content with other agents without an incentive to do so. To stimulate cooperation between agents, we adopt a reputation and trust building scheme that is able to explicitly account for both objective current content availability and subjective willingness to cooperate. The scheme is further complemented with a so-called one-time goodwill mechanism introduced to avoid penalizing agents failures to provide temporarily unavailable content. In a simulated ICN environment under a modified Random Waypoint user mobility model, we investigate the resiliency of the reputation and trust building scheme to subversion, that is, strategic (selfish or malicious) agents acquiring higher trust values than honest ones, for varying user mobility scenarios. The scheme proves resilient in low-mobility scenarios, while increased user mobility is shown to have a negative effect. The one-time goodwill mechanism partly remedies this for high-mobility scenarios. We validate the results by comparison with an existing reputation and trust building scheme and with an alternative user mobility model.

Disaster Relief Management Using Reinforcement Learning-Based Routing

2021 ◽  
Vol 17 (1) ◽  
pp. 24-37
Author(s):  
Gajanan Madhavrao Walunjkar ◽  
Anne Koteswara Rao ◽  
V. Srinivasa Rao
Keyword(s):  
Reinforcement Learning ◽  
Routing Protocol ◽  
Ad Hoc ◽  
Average Energy ◽  
High Mobility ◽  
Adaptive Routing ◽  
Mobility Model ◽  
Delivery Ratio ◽  
Disaster Area ◽  
Disaster Scenario

Effective disaster management is required for the peoples who are trapped in the disaster scenario but unfortunately when disaster situation occurs the infrastructure support is no longer available to the rescue team. Ad hoc networks which are infrastructure-less networks can easily deploy in such situation. In disaster area mobility model, disaster area is divided into different zones such as incident zone, casualty treatment zones, transport areas, hospital zones, etc. Also, in order to tackle high mobility of nodes and frequent failure of links in a network, there is a need of adaptive routing protocol. Reinforcement learning is used to design such adaptive routing protocol which shows good improvement in packet delivery ratio, delay and average energy consumed.

scholarly journals Mobility Range of a Cable Skidder for Timber Extraction on Sloped Terrain

Forests ◽  
2018 ◽  
Vol 9 (9) ◽  
pp. 526 ◽  
Author(s):  
Andreja Đuka ◽  
Tomislav Poršinsky ◽  
Tibor Pentek ◽  
Zdravko Pandur ◽  
Dinko Vusić ◽  
...  
Keyword(s):  
Load Distribution ◽  
Thrust Force ◽  
High Mobility ◽  
Extraction Methods ◽  
Mobility Model ◽  
Harvesting Systems ◽  
Terrain Parameters ◽  
Load Size ◽  
Slope Direction ◽  
Timber Extraction

The use of forestry vehicles in mechanised harvesting systems is still the most effective way of timber procurement, and forestry vehicles need to have high mobility to face various terrain conditions. This research gives boundaries of planning timber extraction on sloped terrain with a cable skidder, considering terrain parameters (slope, direction of skidding, cone index), vehicle technical characteristics and load size (5 different loads) relying on sustainability and eco-efficiency. Skidder mobility model was based on connecting two systems: vehicle-terrain (load distribution) and wheel-soil (skidder traction performance) with two mobility parameters: (1) maximal slope during uphill timber extraction by a cable skidder based on its traction performance (gradeability), and (2) maximal slope during downhill timber extraction by a cable skidder when thrust force is equal to zero. Results showed mobility ranges of an empty skidder for slopes between −50% and +80%, skidder with 1 tonne load between −26% and +63%, skidder with 2 tonne load between −30% and +51%, skidder with 3 tonne load between −34% and +39%, skidder with 4 tonne load between −35% and +30% and skidder with 5 tonne load between −41% and +11%.These results serve to improve our understanding of safer, more efficient timber extraction methods on sloped terrain.

scholarly journals Die taal of die cheetah? Perspektiewe op die belang van taalsigbaarheid by die nuwe Vrystaatse nommerplaat as openbare teken

Literator ◽  
2007 ◽  
Vol 28 (2) ◽  
pp. 119-144 ◽  
Author(s):  
T. Du Plessis
Keyword(s):  
Graphic Design ◽  
Motor Vehicle ◽  
The Other ◽  
Free State ◽  
Linguistic Features ◽  
Positive Identification ◽  
Other Hand ◽  
Negative Effect ◽  
The One

The language or the cheetah? Perspectives on the importance of language visibility on the new Free State number plate as public sign This article investigates the importance of language visibility on the new Free State number plate, on the basis of a survey that was conducted during 2002 among a representative group of motor-vehicle owners in the province. This survey tested the opinions of respondents in respect of two aspects. On the one hand, opinions regarding the illustrated design of the new number plate which was introduced in 2002, were tested; and on the other hand, opinions concerning the linguistic features of the number plate were also investigated. In this article, selected responses to two sets of questions relating to the above will be compared, in order to determine the effect of the graphic design of the new number plate on respondents’ opinions regarding language visibility. A positive identification therewith would provide an indication of the degree to which the negative effect of reduced language visibility on the illustrated number plate in the province’s two main languages, by this minimised.

Not too close, not too far: Urbanisation and life satisfaction along the urban hierarchy

Urban Studies ◽  
2020 ◽  
pp. 004209802096239
Author(s):  
Camilla Lenzi ◽  
Giovanni Perucca
Keyword(s):  
Life Satisfaction ◽  
Urban Economics ◽  
Positive Association ◽  
Well Being ◽  
City Size ◽  
Urban Hierarchy ◽  
Developed Economies ◽  
Positive Externalities ◽  
Negative Effect ◽  
The One

Empirical evidence on the effect of urbanisation on individual self-reported well-being generally points to a negative effect of urbanisation and city size, at least in most developed economies. This article aims to re-assess this conclusion by claiming that this approach overlooks the fact that a city’s positive externalities may expand well beyond the urban boundaries, as postulated in urban economics theory. Based on survey data on self-reported life satisfaction derived from different waves of Eurobarometer surveys in the period 2005–2010 covering 21 European Union member countries, the article empirically verifies the existence of a positive association between urbanisation and individual well-being, depending on the proximity to settings of higher rank in the urban hierarchy. In particular, it shows that the higher the distance from a city larger than the one of residence of the respondent, the lower the probability of being satisfied with life.

THEORETICAL DESIGN OF LIGHT-EMITTING POLYMERS — SUBSTITUTION EFFECTS OF EXCITED STATE ORDERING OF POLYDIACETYLENE AND POLYACETYLENE

2006 ◽  
Vol 05 (spec01) ◽  
pp. 391-400 ◽  
Author(s):  
LIPING CHEN ◽  
XINJUAN HOU ◽  
LINGYUN ZHU ◽  
SHIWEI YIN ◽  
Z. SHUAI
Keyword(s):  
Excited States ◽  
High Mobility ◽  
Molecular Orbital Calculation ◽  
Electron System ◽  
Substitution Effects ◽  
Electron Model ◽  
Light Emitting ◽  
Correlated Electron ◽  
The One ◽  
Correlated Electron System

The excited states structure, essential in determining the light-emitting properties, in a correlated electron system behaves differently from the one-electron system. Previous investigations show that upon proper chemical substitution, the non-emissive polyacetylene (PA) can be designed to be strongly light-emitting materials. On the basis of the correlated quantum chemical calculations within the INDO/EOM-CCSD approach, we systematically studied both the pristine and substituted polydiacetylene (PDA) about the low-lying excited states orderings. PDA possesses high mobility, but it is non-emissive. We predict that it is impossible to cause PDA to be light-emitting. From these numerical results, we propose a simple and practical rule to design conjugated light-emitting polymers, which require only a molecular orbital calculation instead of sophisticated correlated calculations. This rule is derived from physical pictures of correlated electron model, and is found to be in agreement with the existing experiments for various substituted PA and poly(p-phenylenebutadiynylene) (PPPB).

A hotspot attraction driven user mobility model and direction deciding algorithm

2010 ◽  
Author(s):  
Hao Guo ◽  
Zhipeng Gao ◽  
Heng Zhang ◽  
Zhili Guan ◽  
Xingyu Chen ◽  
...  
Keyword(s):  
Mobility Model ◽  
User Mobility

Analysis and interpretation of long term light trap data for Helicoverpa punctigera (Lepidoptera; Noctuidae) in Australia: population changes and forecasting pest pressure

1996 ◽  
Vol 86 (5) ◽  
pp. 547-557 ◽  
Author(s):  
D. Maelzer ◽  
M.P. Zalucki ◽  
R. Laughlin
Keyword(s):  
Light Trap ◽  
South Australia ◽  
Positive Influence ◽  
Weather Data ◽  
Early Season ◽  
South Wales ◽  
Spring Generation ◽  
Negative Effect ◽  
The One ◽  
Trap Catches

AbstractUsing regression analysis the early season dynamics of Helicoverpa punctigera (Wallengren) were determined from long series of light trap catches (10–19 years) from three sites in Australia (Narrabri and Trangie in New South Wales, and Turretfield in South Australia). The size of the second spring generation (G2, the one causing major pest problems in summer cropping regions) was strongly related to the size of the first spring generation (G1). In most cases, rainfall in early winter had a positive influence on the size of G2, whereas rainfall in spring had a negative effect. Regressions were found to account for 49 to 93% of the annual variation in G2, depending on site. The use of light trap catches and weather data to forecast pest levels from a few months to a few weeks in advance is discussed, along with the improved understanding of early season H. punctigera dynamics.

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