5 research outputs found

    A Cluster-Based Web Service Discovery in MANET Environments

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    Establishing Peer-to-Peer Distributed File Sharing System With Mobile Host

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    Viimase kĂŒmne aasta jooksul on mobiilsed seadmed nagu nĂ€iteks nutitelefonid, sĂŒlearvutid, pihuarvutid jne saanud lahutamatuks osaks igapĂ€eva elust. See aga on tekitanud nĂ”udluse vĂ”imsamate, kiiremate ja energiasÀÀstlikumate seadmete jĂ€rgi. Lisaks on iOSi ja Androidi operatsioonisĂŒsteemide vĂ€ljalaske tĂ”ttu suurenenud nii mobiilirakenduste arv kui ka keerukus. Sarnane areng on toimunud ka veebiteenuste valdkonnas ja nutitelefonides on ligi-pÀÀs veebiteenustele muutunud elementaarseks. See aga on viinud jĂ€rgmise sammuni – veebiteenuste pakkumine otse nutitelefonidest. See kontseptsioon pole uus ja seda on pĂ”h-jalikult uurinud S. N. Srirama, kes pakkus vĂ€lja Mobile Host (Mobiilne Veebiteenuse Pak-kuja) lahenduse 2006. aastal, ning mida on C. Paniagua uuendanud Android OS’ile aastal 2012 kasutades REST arhitektuuri ja OSGi’t. P2P (Peer-to-Peer ehk partnervĂ”rk) pĂ”hinevad programmid nagu nĂ€iteks failide jagamine ja sĂ”numite saatmine on tĂ€napĂ€eval arvutikasutajate seas laialdaselt levinud. Ar-vutid ĂŒle maailma on ĂŒhendatud omavahel ja jagavad ressursse selles sĂŒsteemis ilma keskse serverita. Iga arvuti selles vĂ”rgus on vĂ”rdne sel moel, et on vĂ”imeline ligi pÀÀsema ja alla laadima ressursse teistest masinatest selles sĂŒsteemis. Töö kirjeldab pĂ”gusalt Mobile Hosti, P2P arhitektuuri, valitud P2P BitTorrenti pro-tokolli ja kuidas neid tehnoloogiaid kasutati P2P hajusa failide jagamise sĂŒsteemi loomi-seks. Uurimuse kĂ€igus arendati vĂ€lja hajus failide jagamise sĂŒsteem Mobile Hosti lisana kasutades BitTorrenti protokollil pĂ”hinevat C++ keeles kirjutatud Libtorrenti teeki. Valmi-nud programm on vĂ”imeline looma torrent faili, avama ja laadima ning jagama vastavaid faile. Lisaks on vĂ”imalik muuta failide hoiustamise asukohta ja mÀÀrata mĂ”ningaid ses-siooni seadeid nagu nĂ€iteks alla ja ĂŒles laadimise kiirust piirata ning porti mÀÀrata. Failide jagamise teenust pakkuvate seadmete otsingu lihtsustamiseks seati ĂŒles Apache SOLR 4.2.0 veebiteenus mcrlabs.net serverisse millega suhtlus kĂ€ib automaatselt.Mobile devices such as tablets, PDAs, mobile phones etc. have developed rapidly during last decade and become inseparable part of people’s everyday life. These devices are equipped with embedded sensors, camera, touchscreen, more memory, powerful processor, mobile 3G and 4G networks and Wi-Fi capability as well as efficient power consumption mechanisms. These improvements have led to mobile devices being able to perform tasks that usually personal computers are capable of. What is more due to release of Android OS and iOS applications for such mobile devices have increased as well as their complexity. Being online has become ubiquitous as Wi-Fi and mobile data networks are available in most of the places. For example over 45% of world’s population is covered by 3G mobile network [2]. Needlessly to say that makes using web services form mobile devices a com-mon thing. Such improvements lead to next generation of services which can be provided not only from dedicated servers but also from mobile phones. The concept of mobile web services provisioning is not new and has been in the ground for some time. Srirama et al. proposed the concept of Mobile Host [3] in 2006 where the mobile device acts as service provider. Mobile Host enables seamless integration of user specific services to the enterprise by following web service standards, also on the radio link and via resources constrained smart phones. Moreover Mobile Host fosters the new generation of ubiquitous and context-aware applications enabling the consumption of web services anywhere at any time from the handset. Mobile Host has been updated to latest technologies like for example REST archi-tecture which replaced SOAP so web services would be focused on systems resources. Early versions of Mobile Host were developed in PersonalJava and J2ME and meant for Symbian devices but as now the biggest share in smart phones market is held by Android then Mobile Host was upgraded for that platform by Paniagua [4] in 2012. Contribution of this thesis was to develop Peer-to-Peer (P2P) distributed file shar-ing system to Mobile Host for Android. This feature comes in handy when we talk about services that enables file sharing. As Mobile Host by its nature can join or leave network at any moment then accessing files that client is interested in becomes critical as file to be downloaded would be offered only by one provider as in regular client-server architecture. P2P distributed file sharing capability for Mobile Host provides users more reliable file sharing environment in distributed manner as files are downloaded as pieces from all the online peers who have pieces of desired file. What is more, small metadata torrent files are hosted by Mobile Hosts and published as a service. This setup assures the independency from other platforms and hosts

    Discovery and Push Notification Mechanisms for Mobile Cloud Services

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    Viimase viie aasta jooksul on mobiilsed seadmed nagu sĂŒlearvutid, pihuarvutid, nutitelefonid jmt. tunginud peaaegu kĂ”igisse inimeste igapĂ€evaelu tegevustesse. Samuti on pĂ”hjalik teadus- ja arendustegevus mobiilsete tehnoloogiate vallas viinud mĂ€rkimisvÀÀrsete tĂ€iustusteni riistvara, tarkvara ja andmeedastuse alal. TĂ€napĂ€eval on mobiilsed seadmed varustatud sisseehitatud sensorite, kaamera, puutetundliku ekraani, suurema hulga mĂ€luga, kuid ka tĂ”husamate energiatarbemehhanismidega. Lisaks on iOS ja Android operatsioonisĂŒsteemide vĂ€ljalaske tĂ”ttu suurenenud nii mobiilirakenduste arv kui keerukus, pakkudes arvukamalt kĂ”rgetasemelisi rakendusi. Sarnaselt on toimunud olulised arengud ja standardiseerimisele suunatud jĂ”upingutused veebiteenusete valdkonnas ja elementaarsetele veebiteenuste ligipÀÀsu kasutatakse laialdaselt nutitelefonidest. See on viinud loogilise jĂ€rgmise sammuna veebiteenuste pakkumiseni nutitelefonidest. Telefonidest veebiteenuste pakkumise kontseptsioon ei ole uus ning seda on pĂ”hjalikult uurinud Srirama, kes pakkus vĂ€lja Mobile Host (Mobiilne Veebiteenuse Pakkuja) kontseptsiooni. Algne realisatsioon kasutas aga aegunud tehnoloogiaid nagu JMEE, PersonalJava, SOAP arhitektuur jne. See töö uuendab Mobile Host'i kasutades uusimaid tehnoloogiad, nagu Android OS ja REST arhitektuur, ning pakub vĂ€lja teenusemootori, mis pĂ”hineb Apache Felix'il - OSGi platvormi realisatsioonil piiratud ressurssidega seadmetele. HĂ€mmastava kiirusega toimunud arengud mobiilsete arvutuste vallas vĂ”imaldavad uue pĂ”lvkonna veebirakenduste loomist valdkondades nagu keskkonnateadlikkus, sotsiaalvĂ”rgustikud, koostöövahendid, asukohapĂ”hised teenused jne. Sellised rakendused saavad Ă€ra kasutada Mobile Host'i vĂ”imalusi. Selle tulemusena on klientidel ligipÀÀs vĂ€ga suurele hulgale teenustele, mistĂ”ttu tekib vajadus efektiivse teenuste avastamise mehhanismi jĂ€rele. See töö pakub vĂ€lja kataloogipĂ”hise avastusmehhanismi vĂ”rgu ĂŒlekatte toega suurtele, kĂ”rge liikuvusega vĂ”rgustikele. See mehhanism toetub OWL-S'le, mis on ontoloogia veebiteenuseid pakkuvate ressursside avastamiseks, vĂ€ljakutseks, koostamiseks ja jĂ€lgimiseks. Töö kirjeldab ka Srirama vĂ€lja pakutud algupĂ€rast teenuste avastamise mehhanismi, mis toetub peer-to-peer vĂ”rkudele ja Apache Lucene vĂ”tmesĂ”na otsingumootorile. Uurimuse kĂ€igus uuendatakse teenuseotsing kasutama Apache Solr'i, Apache Lucene'i viimast versiooni. Teenuste avastust testiti pĂ”hjalikult ja tulemused on töös kokkuvĂ”tvalt vĂ€lja toodud. Mobiilsete tehnoloogiate vallas uuritakse ka vĂ”imalust kasutada pilvetehnolologiat laiendamaks mobiilseadmete salvestusmahtu ja töökoormust edastades pilve andme- ja arvutusmahukad ĂŒlesanded. See soodustab keerulisemate ja vĂ”imalusrohkemate mobiilirakenduste arendust. Pilve delegeeritavate toimingute aeganĂ”udva iseloomu tĂ”ttu aga on vajalik asĂŒnkroonne mehhanism teavitamaks kasutajat, millal töömahukad tegevused on lĂ”petatud. Mobiilsete pilveteenuste pakkujad ja vahevara lahendused vĂ”ivad kasu saada Mobile Host'ist ja selle asĂŒnkroonsete teavituste vĂ”imekusest. Uurimus esitleb nelja teavitusmehhanismi: AC2DM, APNS, IBM MQTT ja Mobile Host'i pĂ”hine teavitus. Töö vĂ”tab kokku kvantitatiivse analĂŒĂŒsi tulemused ja toob vĂ€lja nelja teavitamise lĂ€henemise tugevused ja nĂ”rkused. Lisaks kirjeldatakse CroudSTag rakenduse realisatsiooni - CroudSTag on mobiilirakendus, mille eesmĂ€rgiks on sotsiaalsete gruppide moodustamine kasutades nĂ€otuvastustehnoloogiat. CroudSTag-i realisatsioon kasutab mobiilseid pilveteenuseid ja Mobile Host'i, et pakkuda oma funktsionaalsust kasutajale.In the last lustrum the mobile devices such as laptops, PDAs, smart phones, tablets, etc. have pervaded almost all the environments where people perform their day-to-day activities. Further, the extensive Research and Development in mobile technologies has led to significant improvements in hardware, software and transmission. Similarly, there are significant developments and standardization efforts in web services domain and basic web services have been widely accessed from smart phones. This has lead to the logical next step of providing web services from the smart phones. The concept of the web service provisioning from smart phones is not new and has been extensively explored by Srirama who proposed the concept of Mobile Host. However, the original implementation considered aged technologies such as JMEE, PersonalJava, SOAP architecture among others. This work updates the Mobile Host to the latest technologies like Android OS and REST architecture and proposes a service engine based on Apache Felix, and OSGI implementation for resource constraint devices. Moreover, the astonishing speed in developments in mobile computing enable the new generation of applications from domains such as context-awareness, social network, collaborative tools, location based services, etc., which benefit from the Mobile Host service provisioning capabilities. As a result the clients have access to a huge number of services available; therefore, an efficient and effective service discovery mechanism is required. The thesis proposes a directory-based with network overlay support discovery mechanism for large networks with high mobility. The proposed discovery mechanism relies in OWL-S, an ontology for service discovery, invocation, composition, and monitoring of web resources. The work also considers the original service discovery mechanism proposed by Srirama relying in peer-to-peer networks and Apache Lucene, a keyword search engine. The study updates the service search to Apache Solr, the latest development for Apache Lucene. The service discovery was extensively tested and the results are summarized in this work. Mobile technologies are looking into the clouds for extending their capabilities in storage and processing by offloading data and process intensive tasks. This fosters the development of more complex and rich mobile applications. However, due to the time-consuming nature of the tasks delegated to the clouds, an asynchronous mechanism is necessary for notifying the user when the intensive tasks are completed. Mobile cloud service providers and Middleware solutions might benefit from Mobile Host and its asynchronous notification capabilities. The study presents four push notification mechanisms being AC2DM, APNS, IBM MQTT and Mobile Host based push notification. The work summarizes the results of a quantitative analysis and highlights the strengths and weakness of the four notifications approaches. In addition, it explains CroudSTag realization, a mobile application that aims the social group formation by means of facial recognition that relies in mobile cloud services and Mobile Host to provide its functionality to the user
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