111 research outputs found
Satelliittiverkkojen palvelun laadun hallinta ja aikataulutus
No full textThis thesis introduces the basics of the satellite networks and traffic control methods. Different packet level network simulators supporting satellite networks are compared. This thesis utilizes the NRT-simulator developed in ESA 4SSTB project.
During the thesis a DiffServ traffic control module for ns-3 is developed. The work introduces the structure and properties of this module.
The other point of focus is to define a simple simulation scenario for comparing different traffic control methods in satellite networks. This work compares the following traffic control methods: FiFo, DiffServ, and Fq-CoDel. The performance of the traffic control methods is compared in terms of throughput, delay, jitter, and packet loss.Diplomityössä perehdytään satelliittiverkkojen perusteisiin, sekä verkkojen liikenteenohjausmenetelmiin. Työssä vertaillaan pakettitason verkkosimulaattoreita, jotka tukevat satelliittiverkkojen simulointia. Tässä työssä simulaattorina käytetään NRT-simulaattoria, joka on kehitetty ESAn 4SSTB-projektissa.
Työn aikana on kehitetty DiffServ-moduuli ns-3 simulaattorille. Moduulin ominaisuudet ja rakenne esitellään työssä.
Työssä määritetään yksinkertainen simulaatioskenaario, jossa voidaan vertailla erilaisia liikenteenohjausmenetelmiä satelliittiverkoissa. Vertailtavat menetelmät ovat FiFo, DiffServ ja Fq-CoDel. Liikenteenohjauksen suorituskykyä vertaillaan käyttämällä seuraavia mittareita: välityskyky (throughput), viive, viivevaihtelu (jitter) ja pakettihävikki
Teollisten sovellusten suorituskyky matkapuhelinverkossa
Get PDFIn this thesis the objective is to introduce the basics of IEC 61850 communication protocol and its messages, the Radio Access Network (RAN) slicing in wireless networks, and the metrics of the wireless networks to evaluate the performance of communication network. The RAN slicing approach is used to evaluate the IEC 61850 standard on 5th Generation (5G) cellular networks by simulation of four representative scenarios.
The simulation scenarios do have different client locations in relation to base stations. One scenario is related to the simulation with default settings, where clients are spread randomly in the base stations coverage area. The other three scenarios are for clients spread equally in the coverage area, clients located only in one base stations coverage area, and another in the center between the base stations coverage area. Each of the scenarios were simulated with base station distances of 100 meters and 200 meters.
The network performance was measured based on the spectral efficiency and the interference. Depending on the scenario, the spectral efficiency was mostly above the simulators reference values. The interference of the system was higher in the scenario where all the clients were in the coverage area of one base station. Distance between base stations did have effect on these key metrics, but there were no sign that distance would be proportional with these key metrics, specially in the performance of each individual RAN slicing.Tämän tutkielman tavoitteena on esitellä IEC 61850 -standardin kommunikaatioprotokolla ja sen viestit, esitellä RAN-siivutus langattomissa verkoissa, sekä esitellä langattoman verkon suorituskyvyn mittareita, jotta voitaan tarkastella verkkoyhteyden suorituskykyä. RAN-siivutusta käytetään simuloitaessa neljää eri skenaariota IEC 61850 -standardista 5G-verkossa.
Simuloitavat skenaariot sisältävät erilaisia asiakaslaitteiden sijainteja suhteessa tukiasemiin. Ensimmäinen skenaario on simulaattorin vakioasetuksilla, jolloin asiakaslaitteet ovat jakautuneet satunnaisesti tukiasemien kantaman alle. Toisessa skenaariossa asiakaslaitteet ovat jakautuneet tasaisesti, kolmannessa ainoastaan yhden tukiaseman alaisuuteen ja neljännessä keskelle. Kaikki skenaariot simuloidaan 100 ja 200 metrin tukiasemien välisellä etäisyydellä.
Verkon suorituskykyä mitattiin spektrin hyötysuhteen ja häiriöiden voimakkuuden avulla. Spektrin hyötysuhde oli enimmäkseen parempi kuin simulaattorin referenssiarvo. Järjestelmän häiriöiden taso oli suurempi skenaariossa, jossa asiakaslaitteet olivat yhden tukiaseman keilassa. Tukiasemien välinen etäisyys vaikutti skenaariosta riippuen, mutta sillä ei voitu todeta olevan suoraa vaikutusta käytettyihin mittareihin, eikä varsinkaan yksittäisiin RAN-siivuihin
KRIITTISTEN LAITTEIDEN ENNAKKOHUOLTO
Get PDFTIIVISTELMÄ
Oulun ammattikorkeakoulu
Kone ja tuotantotekniikan tutkinto-ohjelma
Tekijä: Samuli Pietarila
Opinnäytetyön nimi: Kriittisten laitteiden ennakkohuolto
Työn ohjaajat: Kari Penson ja Kai Jokinen
Työn valmistumislukukausi ja -vuosi: Syksy 2016 Sivumäärä: 45 + 5 liitettä
Opinnäytetyö on tehty Paroc Oy Ab Oulun kivivillatehtaalle. Työn tavoitteena oli löytää prosessilinjan alkupään osalta kriittisimmät laitteet sekä kehittää näiden laitteiden toimintavarmuutta ennakoivalla kunnossapidolla. Toimintavarmuutta kehitettiin selvittämällä kriittisten laitteiden varaosasaatavuudet, huollettavuudet sekä mahdolliset korvaavat laitemuutokset.
Huoltokohteet kartoitettiin kriittisyysanalyysin, tehtaan historiadokumenttien sekä laitevalmistajan toimittamien laitedokumenttien pohjalta. Tarkasteltavana alueena oli prosessilinjan alkupää, joka käsittää prosessin laitteistosta vanhinta laitekantaa. Kriittisille laitteille luotiin ennakoivat kunnonvalvonta- ja huolto-ohjelmat.
Työn tuloksena selvisi prosessin alkupään vikaherkimmät laitteet. Kriittisille laitteille kehitettiin ennakkohuolto-ohjelma, selvitettiin varaosien saatavuus sekä löydettiin korvaavat uudenaikaiset laitteet. Suurimmat haasteet tulivat tehtaan laitehistorian dokumentoinnin vajavaisuudesta, jolloin laitteiden vikahistoria on haastavaa selvittää jälkeenpäin.ABSTRACT
Oulu University of Applied Sciences
Mechanical and production engineering
Author: Samuli Pietarila
Title of thesis: Preventive Maintenance of Critical Equipment
Supervisors: Kari Penson and Kai Jokinen
Term and year when the thesis was submitted: Autumn 2016 Pages: 45 + 5 appendices
This thesis was made for Paroc Oy Ab Oulu stone wool factory. The objective was to identify the critical equipment at the beginning of the process line and to improve the reliability of such equipment with preventive maintenance. Reliability was developed by studying the availability of the spare parts of critical equipment as well as the serviceability, and potential compensatory devices of critical equipment.
Service points were mapped by using criticality analysis, on the basis of the documents provided by the machine history and the documents provided by the manufacturer. The focus of the examination was on the beginning of the process line where the machinery is oldest. Predictive condition monitoring and maintenance programs were created for the critical equipment.
The results showed the most fault-sensitive devices at the beginning of the process. A preventive maintenance program was developed for the critical equipment, the availability of spare parts was examined and modern replacement devices were found. The biggest challenges came from the incomplete documentation of the history of the devices. When the documentation is incomplete the fault history of the equipment is difficult to find out afterwards
Quality of service management & scheduling in satellite networks
No full textThis thesis introduces the basics of the satellite networks and traffic control methods. Different packet level network simulators supporting satellite networks are compared. This thesis utilizes the NRT-simulator developed in ESA 4SSTB project.During the thesis a DiffServ traffic control module for ns-3 is developed. The work introduces the structure and properties of this module.The other point of focus is to define a simple simulation scenario for comparing different traffic control methods in satellite networks. This work compares the following traffic control methods: FiFo, DiffServ, and Fq-CoDel. The performance of the traffic control methods is compared in terms of throughput, delay, jitter, and packet loss
Quality of service management & scheduling in satellite networks
No full textThis thesis introduces the basics of the satellite networks and traffic control methods. Different packet level network simulators supporting satellite networks are compared. This thesis utilizes the NRT-simulator developed in ESA 4SSTB project.During the thesis a DiffServ traffic control module for ns-3 is developed. The work introduces the structure and properties of this module.The other point of focus is to define a simple simulation scenario for comparing different traffic control methods in satellite networks. This work compares the following traffic control methods: FiFo, DiffServ, and Fq-CoDel. The performance of the traffic control methods is compared in terms of throughput, delay, jitter, and packet loss
Quality of service management & scheduling in satellite networks
No full textThis thesis introduces the basics of the satellite networks and traffic control methods. Different packet level network simulators supporting satellite networks are compared. This thesis utilizes the NRT-simulator developed in ESA 4SSTB project.During the thesis a DiffServ traffic control module for ns-3 is developed. The work introduces the structure and properties of this module.The other point of focus is to define a simple simulation scenario for comparing different traffic control methods in satellite networks. This work compares the following traffic control methods: FiFo, DiffServ, and Fq-CoDel. The performance of the traffic control methods is compared in terms of throughput, delay, jitter, and packet loss
Bilder i bruk Samuli Paulaharjus fotografier i dokumentasjonens og illustrasjonens tjeneste
Get PDFSince the late 1970s, Norwegian historians have debated the standing of photographs in historical research. Efforts have been made to establish photographs as sources, not merely illustrations in historical narratives. The present article discusses the use of photographs taken in Northern Norway in the 1920s and 1930s by the Finnish author Samuli Paulaharju, best known for his research on Finnish folk culture. Paulaharju’s photographs have been, and still are, used to tell many different stories. While Paulaharju himself used these photographs in his books to illustrate Finnish culture and history as it manifested itself among the Finnish-speaking minority on the shores of Arctic Ocean, in Norway his photographs have been used to illustrate and partly also document Northern Norwegian cultural and social history and Kven history. The analysis also shows that the photographs are widely used in a positivistic manner: they are seen as representing historical reality, whereas in practice the meaning ascribed to the photographs is contingent on the context of
their deployment. In a consequence, we argue that the position of photographs as a source must be reinforced, and that the usual rules of source criticism must also be applied to photographs
Proceedings of DELbA 2020 - Workshop on Designing and Facilitating Educational Location-based Applications co-located with the Fifteenth European Conference on Technology Enhanced Learning (EC-TEL 2020)
Get PDFThere are several implicit benefits to formal school education. One the
most important is the learning of social skills i.e. how to behave, interact meaningfully and form social bonds with other people. However, there are multiple
situations where the learning of social skills can be disrupted, e.g. bullying or the
recent COVID-19 pandemic that forced schools to transition into distance education. In this work, we investigate the potential of pervasive games (PGs) to
teach social skills and help acquire social capital. Using the theoretical viewpoints of affordance lens and Pierre Bourdieu's theory of capital, we argue that
PGs are able create meaningful activities that not only help learn social skills, but
can scaffold social bonding and increase social capital. We identify six social
affordances in the PG Pokémon GO and show the game teaches a wide variety
of social skills ranging from negotiation and bartering to group interaction. Our
findings have implications on designing educational pervasive games that teach
social skills and accrue social capital.
Keywords: pervasive games, implicit learning, social capital, social capital theory, social skills. </p
Rethinking 'Jacobs Spillovers,' or how diverse cities actually make individuals more creative and economically successful
No full textThe effects of applying IFRS for SMEs for preparers and users of financial statements in Europe
Get PDFPk-yritykset ovat nousseet merkittäväksi puheenaiheeksi viime vuosina niiden työllistävän vaikutuksen vuoksi. Iso osa uusista työpaikoista on syntynyt pk-yrityksiin eikä suuriin yrityksiin. Samalla kansainvälistymiskehitys on ollut aikamme suurimpia muutosvoimia, jotka vaikuttavat talouselämään. Kansainvälistymällä yritykset ovat saaneet uusia väyliä hankkia rahoitusta, laajentaneet ja monipuolistaneet asiakaskuntaansa ja hankkineet skaalaetuja.
Kansainvälisyys aiheuttaa haasteita yritysten taloudelliselle raportoinnille, joten pk-yrityksille luotiin pk-IFRS –standardisto. Sen tarkoituksena on parantaa vertailukelpoisuutta eri maista tulevien yritysten välillä ja keventää raportoinnin raskautta. Tässä tutkielmassa selvitettiin, miten pk-IFRS:n soveltaminen vaikuttaa tilinpäätösten tekijöihin ja käyttäjiin. Tutkielma alkaa teoria-osuudesta, jossa käytiin läpi tuoreita tutkimuksia, minkä pohjalta esiin nousseita kysymyksiä käyttäen tehtiin empiria-osuudessa analysoitava haastattelu.
Tutkimuksessa saatiin selville, että tutkijoiden ja haastateltavan näkemykset pk-IFRS:tä ovat pääosin samanlaiset. Pk-IFRS:n ongelmia on sen lyhyys, mikä aiheuttaa tulkintaongelmia ja monimutkaisuus, joka kuormittaa raportoijan resursseja. Pk-yritykset toimivat useimmin vain kotimaassa, jolloin hyödyt jäävät rajallisiksi. Pienemmissä pk-yrityksissä tilinpäätöksiä käyttäviä sidosryhmiä on vähän, jolloin käyttäjien saamat hyödyt ovat pienet. Kuitenkin käypään arvoon arvostus ja tiedon annon vaatimukset voivat helpottaa rahoituksen saantia joillekin yrityksille, jos pk-IFRS:ää aletaan soveltaa samalla tavalla joka maassa ja yrityksessä.Abstract.
Author: Samuli Seppälä
Title: The effects of applying IFRS for SMEs for preparers and users of financial statements in Europe
Faculty: LUT School of Business and Management
Degree Program: Financial Management
Instructor: Helena Sjögren
Small and medium sized enterprises (SMEs) have become a major topic in recent years due to their effect on employment. A considerable number of jobs are created in SMEs instead of big companies. At the same time globalization has been one of the biggest forces of change in the economy. The discussion on globalization has mainly focused on large and international corporations. Thanks to globalization, companies have found new channels to find financing, expand and diversify their clientele and benefit from economies of scale. SMEs, having a significant position in the economy, should also have ways to benefit from these trends.
IFRS for SMEs was created because globalization created challenges to financial reporting. It aims to enhance comparability between companies from different countries and to reduce the workload of financial reporting. The goal of this thesis was to find out how IFRS for SMEs affects the preparers and the users of financial statements. This thesis consist of a theoretical part and a research part, where answers to a questionnaire are analyzed.
This research highlights the fact that the opinions in the corporate world and in the science community are similar. The biggest problems with IFRS for SMEs are its lack of proper guidance and complexity which takes resources. SMEs usually do business mainly in their home country and especially smaller SMEs have a small number of stakeholders which limits the benefits of IFRS for SMEs. On the other hand the valuation in fair value and the disclosures might help SMEs to find financing
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