Search results for "Content"
showing 10 items of 1859 documents
Moving RTS/CTS to the frequency domain: an efficient contention scheme for 802.11ax networks
2019
In this paper, we propose a contention mechanism based on the execution of multiple contention rounds in the frequency domain (ReCHo), which is designed to offer high throughput performance and robustness with respect to imperfect carrier sensing. The main idea is using narrow tones as signalling messages for performing channel access contentions and allowing the Access Point (AP) to echo these signals, in order to extend the sensing capabilities to all the stations associated to the AP. In particular, we refer to the emerging IEEE 802.11ax standard, showing how our scheme can boost performance of random access with respect to the current version of IEEE 802.11ax OFDMA Back-Off (OBO), even …
'Good to Repeat': Making Random Access Near-Optimal with Repeated Contentions
2020
Recent advances on WLAN technology have been focused mostly on boosting network capacity by means of a more efficient and flexible physical layer. A new concept is required at MAC level to exploit fully the new capabilities of the PHY layer. In this article, we propose a contention mechanism based on Repeated Contentions (ReCo) in frequency domain. It provides a simple-to-configure, robust and short-term fair algorithm for the random contention component of the MAC protocol. The throughput efficiency of ReCo is not sensitive to the number of contending stations, so that ReCo does not require adaptive tuning of the access parameters for performance optimization. Efficiency and robustness is …
Matemātikas mācību satura integrācija informātikas mācību stundās vispārējās vidējās izglītības posmā
2018
Darba autors: Deniss Kļukins Darba nosaukums: Matemātikas mācību satura integrācija informātikas mācību stundās vispārējās vidējās izglītības posmā Darba mērķis: Teorētiski pamatot un praktiski pārbaudīt matemātikas mācību satura integrācijas nepieciešamību un iespējas mācību stundas vispārējās vidējās izglītības posmā. Pētījuma ietvaros ir analizētas mācību satura un tā integrācijas iespējas caur integrācijas būtības un veidu apskati, mācību priekšmeta “Informātika” mācību satura analīzi, mācību priekšmeta “Matemātika” mācību satura analīzi un matemātikas mācību satura integrācijas iespēju informātikas mācību stundās analīzi. Pētījuma laikā pārbaudīta mācību satura praktiskā integrācija ca…
Investigation of the dynamics of bacteriorhodopsin
1990
Bacteriorhodopsin (bR) converted to the blue form by deionization has been reconstituted to the active purple membrane by addition of57Fe ions. Mossbauer spectra measured in a wide temperature range reveal Fe3+ binding places with oxygen atoms in the neighbourhood. No evidence for a well defined functional binding place of the iron has been found. On a timescale faster 100 ns the purple membrane shows increasing flexibility above 200 K. In order to analyse the influence of the lipids, a bacteriorhodopsin sample where the lipid content has been increased artificially by the incorporation of DMPC as well as a sample consisting of lipid bilayer have been investigated.
FeOOH-modified clay sorbents for arsenic removal from aqueous solutions
2019
The presence of arsenic (As) in natural and anthropogenic soils causes severe pollution of groundwater due to its harmful carcinogenic effects. The present work describes the research activities for searching of appropriate innovative sorbents based on clay material for As sorption using iron oxy-hydroxide modification. Natural and manufactured clay was chosen for comparison of modification efficiency in order to obtain best sorption results for As(V). The results of pilot testing were obtained and the sorption was studied as a function of initial arsenic concentration. Obtained results indicate that modification of clay with Fe compounds significantly improves the sorption capacity of a ne…
Selecting significant respondents from large audience datasets: The case of the World Hobbit Project
2016
International projects, online questionnaires, or data mining techniques now allow audience researchers to gather very large and complex datasets. But whilst data collection capacity is hugely growing, qualitative analysis, conversely, becomes increasingly difficult to conduct. In this paper, I suggest a strategy that might allow the researcher to manage this complexity. The World Hobbit Project dataset (36,109 cases), including answers to both closed and open-ended questions, was used for this purpose. The strategy proposed here is based on between-methods sequential triangulation, and tries to combine statistical techniques (k-means clustering) with textual analysis. K-means clustering pe…
Makes sense, Maken järki : a case study of using English while playing
2015
Englanninkielen käyttöä suomenkielisen tekstin lomassa on tutkittu videopeleihin liittyen keskusteluanalyysiä käyttäen, muttei koskaan diskurssi- tai sisältöanalyysillä. Myöskään pelivideoissa esiintyvää kielen vaihtelua ei ole tutkittu. Tämä tutkimus pyrkii selvittämään tapaustutkimuksen kautta, miten suomea äidinkielenään käyttävä pelivideoiden tekijä käyttää videoissaan englantia. Tarkoituksena on myös yrittää kategorisoida erilaisia englannin kielen käyttötapoja. Tutkimuksen aineistoksi valittiin yksi noin 20 minuutin pelivideo suositulta Youtube-kanavan pitäjältä. Aineistoksi kerättiin videosta jokainen englantia tai lainasanoja sisältänyt fraasi ja ne litteroitiin. Tutkimuksessa analy…
Exploring Creativity Expectation in CS1 Students’ View of Programming
2020
Full paper in Research category: Literature provides creativity definitions that are applicable to educational settings. For example, the definition by Plucker et al. emphasizes the ‘social context’ in which the usefulness and novelty of a creative outcome is evaluated, and notes that this emphasis allows students’ coursework to be deemed creative without extraordinary characteristics. Computing educators tend to assume that incoming CS course populations welcome creativity, and utilize application contexts (e.g., games, media, arts, and robots) in which creativity is a central attribute. Previous research also suggests that beginner CS students may initially possess versatile identities re…
Mitä opin? Monilukutaitoa ja tutkivaa oppimista monialaisessa oppimiskokonaisuudessa
2019
Tarkastelemme tässä artikkelissa, mitä oppilaat, opettajat ja opettajaopiskelijat raportoivat oppineensa yhdessä toteuttamassaan monialaisessa oppimiskokonaisuudessa, johon osallistuivat erään yhtenäiskoulun kaikki 5.–8. luokan oppilaat. Oppimiskokonaisuuden aihe oli terve elämä ja sitä opiskeltiin viikon ajan ikäsekoitteisissa ryhmissä tutkivan oppimisen keinoin ja monilukutaitoa harjaannuttaen. Tutkimusaineisto koostuu 250 oppilaan, 25 opettajan ja 23 opettajaopiskelijan laadullisista itsearvioinneista, ja se analysoitiin laadullisen aineistolähtöisen teoriaohjaavan sisällönanalyysin keinoin. Tulosten mukaan oppilaat kertoivat oppineensa vuorovaikutustaitoja ja monimuotoisten tekstien tuo…
Company values guiding the recruitment of employees with a foreign background
2019
Purpose In this paper, the following research question is addressed: Why do business organisations recruit employees with a foreign background? This was examined in terms of the values that guide organisations and their management. The paper aims to discuss this issue. Design/methodology/approach The study focused on two businesses in Finland that are pioneers in the recruitment of immigrants. A case study approach was adopted. The research data consist of interviews and documentary data. The data were analysed using content analysis in accordance with grounded theory. Findings Companies can act as an enabling force in the integration of immigrants into the local labour market, especially …