1,678 research outputs found
Framework for pedestrian walking behaviour recognition to minimize road accident
Pedestrian walking misbehaviour represents a severe problem to road safety.
Therefore, pedestrian behaviour classification is a perfect solution in providing safety
for both pedestrians and vehicles by exchanging movement information among entities
via wireless communication. However, wireless communication has critical issues
with network failure, and these issues significantly affect the communication system.
Thus, the framework involved two modules for pedestrian walking behaviour
classification in a vehicle-to-pedestrian (V2P) context is proposed. In the
methodology, this study discloses five useful stages. Firstly, mobile phone users'
irregular walking behaviour is investigated using a questionnaire to determine their
options on mobile usage in the street. Secondly, four different testing scenarios are
chosen to acquire pedestrian walking data using the gyroscope sensor, where the
essential features were extracted and selected. Thirdly, the pedestrian's behaviour is
recognized using grid optimizer in machine learning. Fourthly, four standard vectors
for pedestrian walking behaviour are developed. Fifthly, the performance of the
proposed classification methods is validated and evaluated against multiple scenarios
and features. Two sets of real-time data are presented in this work. The first one is
related to the questionnaire data, consisting of 262 respondent samples, while the
second set has 263 samples of pedestrian walking signals. The results indicate the
following: (1) From 262 samples, 66.80% and 48.10% of respondents use mobile
phones for calling and chatting, respectively. (2) 263 samples of participants are
obtained and analysed, and 90 features are extracted from each sample. (3) 100%
classification accuracy are obtained for each class (normal walking, calling, chatting,
and running) using the grid optimiser method in machine learning. (4) The precision
of classification using Euclidean algorithm for normal walking and calling is 70%. In
contrast, for chatting and running behaviour, the accuracy is 100% and 80%,
respectively. This study's implication serves the safety system in the V2P context by
programming the proposed framework as an application in smartphones for
exchanging pedestrian information to the vehicles for avoiding accidents
Empirical likelihood test in a posteriori change-point nonlinear model
In this paper, in order to test whether changes have occurred in a nonlinear
parametric regression, we propose a nonparametric method based on the empirical
likelihood. Firstly, we test the null hypothesis of no-change against the
alternative of one change in the regression parameters. Under null hypothesis,
the consistency and the convergence rate of the regression parameter estimators
are proved. The asymptotic distribution of the test statistic under the null
hypothesis is obtained, which allows to find the asymptotic critical value. On
the other hand, we prove that the proposed test statistic has the asymptotic
power equal to 1. These theoretical results allows find a simple test
statistic, very useful for applications. The epidemic model, a particular model
with two change-points under the alternative hypothesis, is also studied.
Numerical studies by Monte-Carlo simulations show the performance of the
proposed test statistic, compared to an existing method in literature
Empirical likelihood test for high-dimensional two-sample model
A non parametric method based on the empirical likelihood is proposed for
detecting the change in the coefficients of high-dimensional linear model where
the number of model variables may increase as the sample size increases. This
amounts to testing the null hypothesis of no change against the alternative of
one change in the regression coefficients. Based on the theoretical asymptotic
behaviour of the empirical likelihood ratio statistic, we propose, for a fixed
design, a simpler test statistic, easier to use in practice. The asymptotic
normality of the proposed test statistic under the null hypothesis is proved, a
result which is different from the law for a model with a fixed
variable number. Under alternative hypothesis, the test statistic diverges. We
can then find the asymptotic confidence region for the difference of parameters
of the two phases. Some Monte-Carlo simulations study the behaviour of the
proposed test statistic
Conceptual Model for Communication
A variety of idealized models of communication systems exist, and all may
have something in common. Starting with Shannons communication model and ending
with the OSI model, this paper presents progressively more advanced forms of
modeling of communication systems by tying communication models together based
on the notion of flow. The basic communication process is divided into
different spheres (sources, channels, and destinations), each with its own five
interior stages, receiving, processing, creating, releasing, and transferring
of information. The flow of information is ontologically distinguished from the
flow of physical signals, accordingly, Shannons model, network based OSI
models, and TCP IP are redesigned.Comment: 13 pages IEEE format, International Journal of Computer Science and
Information Security, IJCSIS November 2009, ISSN 1947 5500,
http://sites.google.com/site/ijcsis
Value co-creation in corporate event industry : Identifying clientsâ value propositions
This study discusses the importance of value co-creation in corporate event industry in Finland. The purpose of this study is to identify how event service providers in the corporate event industry co-create value with their clients with two sub-objectives: to understand the role of event providers by investigating to what extent they can affect the value creation and to scrutinize how interaction between event providers and clients create value in corporate event industry.
The theoretical background of the study consists of literature relating to the concepts of value creation and value co-creation by looking at the characteristics of events as a service and the characteristics of value. This study adapts the qualitative research approach enabling to profoundly explore the phenomenon and expand the current understanding of corporate events and value co-creation. The empirical research conducted for this study is based on semi-structured interviews. The interview data was collected between November 2019 and January 2020. In total, seven interviews were conducted: three with representatives of startup companies, two with large companies and two with governmental organizations.
This study finds that close relationship and collaboration between event providers and clients is crucial for ensuring the successfulness of a corporate event. It was also concluded that the outcomes of a successful and valuable event for clients are new customer acquisition, number of leads, the value of completed trade and number of new connections. The findings of this research emphasize the importance of the event providerâs knowledge about clientsâ businesses in order to maximize the efficiency and to better leverage benefits of the corporate event and to ensure proper service for the clients to meet their goals.
The findings of this study enhance understanding of the concept of buyer-seller relationship. Thus, this study provides important managerial implications, enabling corporate event providers to identify the essential characteristics in order to create value for their clients, as well as provides suggestions for future academic research.TÀmÀ tutkimus kÀsittelee arvon yhteisluonnin merkitystÀ yritystapahtuma-alalla Suomessa. Tutkimuksen tavoitteena on tunnistaa, kuinka yritystapahtumatoimialan palveluntarjoajat luovat arvoa yhdessÀ asiakkaidensa kanssa. LisÀksi tutkimukselle asetettiin kaksi alatavoitetta. EnsimmÀinen tavoite on ymmÀrtÀÀ tapahtumatoimittajien rooli yritystapahtumien lisÀarvon tuottajana. Toinen tavoite on selvittÀÀ kuinka paljon tapahtumatoimittajat voivat vaikuttaa lisÀarvon luomiseen, sekÀ tarkastella tapahtumatoimittajien ja heidÀn asiakkaidensa vÀlisestÀ vuorovaikutuksesta syntyvÀÀ lisÀarvoa yritystapahtuma-alalla.
Tutkimuksen tavoitteen saavuttamiseksi tutkittiin arvonluonnin ja arvon yhteisluonnin kÀsitteisiin liittyviÀ kirjallisuuksia tarkastelemalla tapahtumien ominaisuuksia palveluna sekÀ arvon ominaispiirteitÀ. Haastatteluaineiston jÀsentÀmisessÀ hyödynnettiin laadullista tutkimusmenetelmÀÀ, jonka avulla voidaan tutkia syvÀllisesti ilmiötÀ ja laajentaa nykyistÀ ymmÀrrystÀ yritystapahtumista ja arvonluonnista. Tutkielmaa varten toteutettiin empiirinen tutkimus, joka perustuu puolistrukturoituihin haastatteluihin. Haastatteluja tehtiin marraskuun 2019 ja tammikuun 2020 vÀlisenÀ aikana yhteensÀ seitsemÀn: kolme startup-yritysten, kaksi suuryritysten ja kaksi valtionhallinnon organisaation edustajien kanssa.
TÀmÀ tutkimus osoittaa, ettÀ tehokas yhteistyö tapahtumatoimittajien ja asiakkaiden vÀlillÀ on vÀlttÀmÀtöntÀ yritystapahtuman onnistumisen varmistamiseksi. LisÀksi, onnistuneen ja asiakkaille arvokkaan tapahtuman tuloksia ovat uusasiakashankinta, potentiaalisten asiakkaiden lukumÀÀrÀ, toteutuneen kaupan arvo ja uusien yhteyksien mÀÀrÀ. Tutkimustulokset korostavat tapahtumatoimittajien tietÀmyksen merkitystÀ yritysasiakkaidensa liiketoiminnasta, jotta yritystapahtumien tehokkuutta voidaan maksimoida ja hyödyntÀÀ paremmin sekÀ varmistaa yritysasiakkaille asianmukaisen palvelun tavoitteidensa saavuttamiseksi.
Tutkimuksen tulokset auttavat ymmÀrtÀmÀÀn ostajan ja myyjÀn vÀlisen suhteen kÀsitettÀ yritystapahtuma-alalla. Tutkimus tarjoaa tÀrkeitÀ johtopÀÀtöksiÀ, joiden avulla yritystapahtumien tarjoajat voivat tunnistaa ne erityispiirteet, jotka vaikuttavat arvon yhteisluontiin sekÀ ymmÀrtÀmÀÀn kuinka arvon yhteisluonti tapahtuu. Tutkimuksen lopuksi tarjotaan myös ehdotuksia tulevaisuuden akateemiselle tutkimukselle
Real structures on primary Hopf surfaces
The first goal of this article is to give a complete classification (up to
Real biholomorphisms) of Real primary Hopf surfaces , and, for any such
pair, to describe in detail the following naturally associated objects : the
group of Real automorphisms, the Real Picard group
, and the Picard group of Real holomorphic line
bundles . Our second goal: the classification of
Real primary Hopf surfaces up to equivariant diffeomorphisms, which will allow
us to describe explicitly in each case the real locus and
the quotient
Engineering Sciences Vol. 30, No. 2, 2022â
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ۧÙÙÙŰŻŰłÙÙEngineering Science
Cement Percent Effect on the Shear and Interface Strength of Remolded Cement Treated Sand
This research aims to simulate the behavior of remolded cement treated poorly graded sand in term of shear and interface strength using the direct shear test. Different percentages of cement up to 15% by weight are added to the soil samples. Compacted cement treated soil samples are prepared at the optimum moisture content and left for 28 days in the humidity room then distributed to use them for the remolding samples preparation. The shear strength parameters for both cases soil to soil interface and concrete to soil interface are predicted, where the results show that the interface strength parameters are higher than the shear strength parameters of the remolded soil samples. The increase in cement percent increases the cohesion (C) of the treated soil, whereas the interface cohesion (Cint.) has a maximum value at 10% of added cement, and the maximum percent between cohesion (Cint.) and soil cohesion (C) is of 76.2% at 0% added cement. Moreover, the results show an increase in the interface angle of friction (ÎŽ) and a decrease in the angle of friction (Ï) as the percent of cement increases. The maximum percent between interface angle (ÎŽ) and angle of friction (Ï) is 63.5% at 15% of the added cement. The hardened cement in the remolded case adheres to sand grains and works as soil grains with different sizes that lead to changes in the shear properties of the soil
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