Search results for "LTE"
showing 10 items of 4531 documents
Listwise Collaborative Filtering
2015
Recently, ranking-oriented collaborative filtering (CF) algorithms have achieved great success in recommender systems. They obtained state-of-the-art performances by estimating a preference ranking of items for each user rather than estimating the absolute ratings on unrated items (as conventional rating-oriented CF algorithms do). In this paper, we propose a new ranking-oriented CF algorithm, called ListCF. Following the memory-based CF framework, ListCF directly predicts a total order of items for each user based on similar users' probability distributions over permutations of the items, and thus differs from previous ranking-oriented memory-based CF algorithms that focus on predicting th…
Data mining framework for random access failure detection in LTE networks
2014
Sleeping cell problem is a particular type of cell degradation. There are various software and hardware reasons that might cause such kind of cell outage. In this study a cell becomes sleeping because of Random Access Channel (RACH) failure. This kind of network problem can appear due to misconfiguration, excessive load or software/firmware problem at the Base Station (BS). In practice such failure might cause network performance degradation, which is hardly traceable by an operator. In this paper we present a data mining based framework for the detection of problematic cells. In its core is the analysis of event sequences reported by a User Equipment (UE) to a serving BS. The choice of N i…
The influence of dataset size on the performance of cell outage detection approach in LTE-A networks
2015
The configuration and maintenance of constantly evolving mobile cellular networks are getting more and more complex and hence expensive. Self-Organizing Networks (SON) concept is an umbrella term for the set of automated solutions for network operations proposed by 3rd Generation Partnership Project (3GPP) group. Automated cell outage detection is one of the components of SON functionality. In early studies our research group developed data-driven approach for the detection of malfunctioning cells. In this paper we investigate the performance of the proposed solution as a function of the density of active users and the size of observation interval. The evaluation is conducted in Long Term E…
Higher-order Nonnegative CANDECOMP/PARAFAC Tensor Decomposition Using Proximal Algorithm
2019
Tensor decomposition is a powerful tool for analyzing multiway data. Nowadays, with the fast development of multisensor technology, more and more data appear in higherorder (order > 4) and nonnegative form. However, the decomposition of higher-order nonnegative tensor suffers from poor convergence and low speed. In this study, we propose a new nonnegative CANDECOM/PARAFAC (NCP) model using proximal algorithm. The block principal pivoting method in alternating nonnegative least squares (ANLS) framework is employed to minimize the objective function. Our method can guarantee the convergence and accelerate the computation. The results of experiments on both synthetic and real data demonstrate …
Muutos tilassa : taideteoksen autenttisuuden ja auran merkitykset installaatiotaiteen esittämisen ja tallentamisen prosesseissa
2015
Tässä pro gradu -tutkielmassa tarkastellaan taideteoksen autenttisuuden ja auran nykymerkityksiä installaatiotaiteen näkökulmasta. Keskeisenä tavoitteena on selvittää, mistä kontekstisidonnaisen ja prosessuaalisen installaatioteoksen autenttisuus muodostuu, ja millä tavoin tätä autenttisuutta pyritään taidemuseoissa teoksen esittämisen ja tallentamisen prosesseissa ylläpitämään. Lisäksi tutkielmassa avataan taiteilijan intention ja tekijyyden käsitteitä. Tutkielmassa vuoropuhelua käyvät taidefilosofinen käsiteanalyysi ja taidemuseoiden toimintatapoja kartoittava haastatteluaineisto. Taiteen autenttisuuden nykymerkityksiä peilataan erityisesti Denis Duttonin autenttisuuden teoriaa ja Walter …
Riconfigurare i territori metroplitani. Forme di urbanizzazione e fenomeni di pressione insediativa sui sistemi di interesse naturale in Sicilia
2018
The consumption of the soil due to urbanization it is a phenomena already for many years under observations, but of which only the scientific environment has noticed the elevated environmental impact progress. From a disciplinary point of view, is possible to identify a line of research focusing on the analysis and identification of new morphologies of urbanization and on the interaction among different settlement patterns coexisting in a specific context. This reading complements with the scientific production about the forms of settlement pressure on environmental systems, producing change and deterioration on natural ecosystems and loss of biodiversity. A necessary reference for this lin…
Editorial
2022
Oman äidinkielen osaaminen – hyödyntämätön resurssi
2020
Tässä artikkelissa tarkastelemme monikielisten oppilaiden oman äidinkielen merkitystä osana Suomen kansallista kielivarantoa, kuvaamme opettajan työtä ja arjen haasteita sekä pohdimme oman äidinkielen opetuksen tulevaisuutta erityisesti opettajien koulutuksen kannalta. Kysymme, olisiko jo aika luoda koulutuskokonaisuus, joka tuottaisi monipuolisesti kielididaktiikkaa ja monikielisyyttä tuntevia ammattilaisia. Samalla Suomeen muuttaneet opettajat voisivat käyttää osaamistaan ja toimia monikielisten oppilaiden ja perheiden tukena ja linkkinä kouluun. nonPeerReviewed
Onko kielikoulutus saavutettavaa?
2020
Tutkijat totesivat, että vaikka kielikoulutusta olisi saatavilla, se ei aina ole saavutettavaa. Saavutettavuuteen kuuluu tarjollaolemisen lisäksi opetuksen laatu ja opitun arvostus. nonPeerReviewed
Teaching classic put to the test: Do tongue twisters work for L2 pronunciation?
2023
Tongue twisters are a controversial pronunciation teaching classic. Whereas some see tongue twisters difficult and frustrating for learners, others find them fun and motivating. This study was inspired by these opposing views and the fact that previous studies have failed to offer convincing proof of whether this technique works for L2 pronunciation learning. This study approaches the question with a teaching experiment. Participants were 28 learners of L2 Swedish. Half of them trained with tongue twisters and half with authentic sentences. Training focussed on two sounds typically difficult for the learners, who were tested before and after the training period. Further, the participants we…