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Qos-aware Service Selection For Web Service CompositionAbdyldaeva, Rahat 01 June 2012 (has links) (PDF)
Composition of web services is one of the flexible and easiest approaches for
creating composite services that fulfill complex tasks. Together with providing
convenience in creation of new software applications, service composition has
various challenges. One of them is the satisfaction of user-defined Quality of Service
(QoS) requirements while selecting services for a composition. Load balancing issue
is another challenge as uncontrolled workload may lead to violation of service
providers&rsquo / QoS declarations. This thesis work proposes a QoS aware method for
optimum service composition while taking into account load balancing. M/M/C
queuing model is utilized for the individual services to determine sojourn time
distribution for possible compositions. Percentile of the execution time, price and
availability are considered as QoS parameters. Proposed algorithm selects the
optimum composition according to QoS constraints and utility provided by the
services. The performance of the method is evaluated by custom simulation software
and is compared to two other methods, random selection and average execution timebased
optimal service selection.
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Panic buttons, shrugged shoulders and drowning email inboxes : Stories of account takeovers and trust / Panikknappar, ryck på axlarna och drunknande emailinkorgar : Berättelser om kontoövertagandeincidenter och förtroendeBerglöf, Amalia January 2022 (has links)
Users face many risks while being online, including ones posed by their own actions, such as keeping the same passwords on multiple services. This makes them potential victims of account takeovers, in which a hacker uses stolen credentials to acquire and use accounts for their own benefit. However, few papers have researched how users experience these incidents, and how this affects their trust in the service. To fill this research gap, 4 users that were part of the same account takeover incident were interviewed. Storytelling was used to present and analyse the interviews. One participant experienced the takeover as it happened, while the other three learned about it after it was mitigated. The results show that the role the user took, and how they valued the platform, affected their trust. This paper contributes to research by giving in-depth insights into account takeovers, and what challenges and opportunities the systems face. / Användare står inför många risker när de är online, inklusive de som orsakas av deras egna handlingar, som att behålla samma lösenord på flera tjänster. Detta gör dem till potentiella offer för kontoövertaganden, där en hackare använder stulna inloggningsuppgifter för att ta kontroll över och använda konton till sin egen fördel. Men få studier har undersökt hur användare upplever dessa incidenter och hur detta påverkar deras förtroende för tjänsten. För att bidra med kunskap inom detta område intervjuades 4 användare som ingick i samma incident med kontoövertagelser. Storytelling användes för att presentera och analysera intervjuerna. En deltagare upplevde övertagandet medan det hände, medan de andra tre f ick veta om det efter att det hanterats. Resultaten visar att den roll användaren tog, och hur de värderade plattformen, påverkade deras förtroende. Denna artikel bidrar till forskningen genom att ge ingående insikter om övertaganden och vilka utmaningar och möjligheter systemen står inför.
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Social capital and the digital divide : implications for online health informationPrincipe, Iolanda January 2006 (has links)
This thesis addresses the implications of Australian and South Australian government policies for the provision of online health information. It focuses on subjective meanings about internet use and access by questioning the use of information and communications technology (ICT) for health information. It analyses egalitarian approaches by government entities for universal access and explores how the phenomenon of the internet is claimed to be a potential conduit for social inclusion to reduce health inequalities.
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Energy-efficient Routing To Maximize Network Lifetime In Wireless Sensor NetworksZengin, Asli 01 July 2007 (has links) (PDF)
With various new alternatives of low-cost sensor devices, there is a strong demand for large scale wireless sensor networks (WSN). Energy efficiency in routing is crucial for achieving the desired levels of longevity in these networks. Existing routing algorithms that do not combine information on transmission energies on links, residual energies at nodes, and the identity of data itself, cannot reach network capacity. A proof-of-concept routing algorithm that combines data aggregation with the minimum-weight path routing is studied in this thesis work. This new algorithm can achieve much larger network lifetime when there is redundancy in messages to be carried by the network, a practical reality in sensor network applications.
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Using Google Analytics And Think-aloud Study For Improving The Information Architecture Of Metu Informatics Institute Website: A Case StudyDemirel Kutukcu, Seher - 01 September 2010 (has links) (PDF)
Today, web sites are important communication channels that reach a wide group of people. Measuring the effectiveness of these web-sites has become a key issue for researchers as well as practitioners. However, there is no consensus on how to define web site effectiveness and which dimensions need to be used for the evaluation of these web sites. This problem is more noteworthy for information driven web sites like academic web sites. There is limited academic literature in this predominant application area. The existing studies measured the effectiveness of these academic web sites by taking into account their information architecture mostly using think-aloud methodology. However, there is limited study on web analytics tools which are capable of providing valuable information regarding the web site users such as their navigation behaviours and browser details. Although web analytics tools provide detailed and valuable information, the existing studies have utilized their very basic features.
In this thesis, we have explored web analytic tools and think-aloud study method to improve information architecture of web sites. Taking METU Informatics Institute web site as a case study, we have used the reports of Google Analytics which is a commercial web analytics tool owned by Google and think-aloud study results to improve the information architecture of our case study web-site.
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Pizza till din dörr : - En konkurrensrättslig studie om marknadsavgränsning av den relevanta marknaden för onlinetjänster, särskilt onlinebeställning av mat / Pizza to your door : - A competition law study about the definition of the relevant market for online services, especially online ordering of foodHagström, Oliver, Thorn, Simon January 2015 (has links)
I uppsatsen undersöks marknadsavgränsningen vid onlinetjänster vilket är ett ämne som uppmärksammats nyligen i ett avgörande från Marknadsdomstolen där inblandade parter var OnlinePizza och Pizza24, som båda är verksamma inom onlinebeställning av mat. Yrkandet kunde inte bifallas på grund av bristande bevisning från den yrkande parten. Författarna har diskuterat hur utfallet av domen kunde blivit om tillräcklig bevisning hade lagts fram.Med stöd av svensk och europeisk rätt samt relevant praxis diskuterar författarna framförallt angående begränsningen av den relevanta produktmarknaden vid onlinetjänster, särskilt för matbeställningar.Det går inte att dra slutsatser angående den relevanta produktmarknaden för onlinetjänster eftersom tjänsterna till en väldigt stor grad skiljer sig från varandra generellt i syfte och användning. Författarna har undersökt tjänsten onlinebeställning av mat och kommit fram till att den relevanta produktmarknaden bygger på tre grundpelare. Även om onlinetjänster oftast betraktas som geografiskt obegränsade spelar dock den geografiska marknaden roll vid fastställandet av den relevanta marknaden för olika onlinetjänster.
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Tvorba a rozvoj informačního portálu pro podnikatelskou veřejnost / The creation and the development of the internet portal for public and private sector.MATOUŠEK, Libor January 2011 (has links)
This thesis deals with The Creation and the development of the internet portal for public and private sector. The main aim of this graduation theses is to describe the problematic parts during creation of the internet portal and its development.
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Podnikatelský plán online platformy propojující ekonomické komerční subjekty na českém trhu / The Business Plan to Set Up an Online Platform Connecting Economic Commercial Entities on the Czech marketŘehoř, Pavel January 2021 (has links)
The content of the master’s thesis is the elaboration of a real business plan, which deals with the creation of a digital space for the professional self-realization of customer segments. The theoretical part describes the specification and verification of the initial idea of the plan using the Lean Canvas tool, qualitative research among the first customers and other analytical methods to define key factors from the general and market environment and internal sources. The analytical part focuses on the application and results of selected analytical-research methods, including evaluation for the subsequent selection of a suitable market entry strategy. The proposition part contains the final business and market strategy and business model, which is developed into individual parts of the business plan.
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客戶回訪預測模型應用於線上預約服務 / Predictive modeling of customer retention in online reservation services林煥禹, Lin, Huan Yu Unknown Date (has links)
隨著電子商務近年的蓬勃發展,許多形形色色的創新服務應運而生。本研究針對具指標性的線上餐飲訂位平台---EZTable(簡單桌)進行分析,對於EZTable而言,前來訂位的客戶是十分重要的,因為高客戶忠誠度能為其帶來更多市佔率。因此,本研究將會針對以下兩點問題進行研究分析:(1)為了能夠準確預測顧客回訪率,那些因素與客戶回訪率是高關聯性的?如訂位者、餐廳、地理位置等資訊。(2)應如何建構並驗證高準確度的預測模型?根據以上問題,本研究使用廣義加成模型(GAM)、決策樹(decision tree)、套袋抽樣(bagging)、隨機森林(random forest)等模型訓練方法,搭配EZTable大量的訂位資料,建構不同的預測模型來預測客戶回訪率。以EZTable的資料而言,本研究發現比起訓練模型的方法,模型變數的選擇更明顯影響了預測表現,而關於訂位本身的資訊,如訂位狀態,能夠大幅度提升預測準確度。這些發現能夠幫助如EZTable等服務提供者,了解哪些變數對於顧客忠誠度是相當重要的;再者,公司能夠透過這些資訊,為有較高回訪率的會員量身打造適合的促銷活動。透過將行銷資源集中在特定的客戶上,這些提供服務公司的行銷成本也能夠因此減少。 / Electronic commerce still grows rapidly in the recent years and innovative services are introduced in the recent years accordingly. This research analyzes a representative online reservation service provider – EZTable. Loyalty of customer is crucial because EZTable can obtain more market share with high customer loyalty. Therefore, we expect to answer the following research questions: (1) What are relevant and useful consumer, restaurant, and demographic factors to predict customer retention? (2) How do we develop and determine effective predictive models? We apply generalized additive model, decision tree, bagging, and random forest, to a large volume of operational data from EZTable and develop a set of predictive models. Instead of model complexity, identifying critical variables from the research context determines predictive performance. Transaction-dependent factors could substantially enhance predictive performance. Our findings enable companies like EZTable to understand what predictors are critical to customers’ loyalty. Further, the company can design effective promotions for customers with higher return probability. Our modeling effort could help those service providers reduce advertising cost by allocating limited resources to customers with higher probability to place orders again.
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Värdet av en Virtuell Relation : Aktivitet i förhållande till kontext – Spotify ur ett praktikperspektivRückert, Hugo, Johnson, Magnus January 2013 (has links)
The increased interest in relationship marketing and the potential of the Internet as a platform for relationship building activities have given rise to new ways for companies to interact with their customers, such as services based on a freemium pricing model. Based on the premise that relationships are processes consisting of interactive moments of value-creating activities, value is considered subjective, relative and dependent on the context in which the activity takes place. Value is therefore variable given its context and cannot be pre-defined without nuances being lost. Despite the Internet's given role in societal development, our understanding of what contributes to customers' intentions to build relationships with online services is yet to mature. As the music industry is well established on the Internet, alongside the change in how music is consumed, it is thus appropriate to examine activities in accordance with a freemium based service that distributes music online, since it still lacks in academic understanding. This study aims to provide insights about virtual relations and how online services that provide cultural content should relate to there users as well as contributing to the ongoing academic discussion regarding value and how it is manifested by highlighting contextual impact on relational activities. For a rapprochement of relations to online services in cultural industries, this study assumed a practice perspective. In accordance with practice theory and action research, primary data was collected through participatory observation set in users' natural social environment, with a targeted sample of informants well familiar with the object of study - the online service Spotify. The results show that value in virtual relationships arise inter-subjectively between users, where value is relative to past experiences, changeable over time, and expressed through individual and collective activities afforded by current context. If usage of a service is part of the daily routine, it also becomes a part of the user's identity, which the user, in order not to disrupt the routine, is willing to make sacrifices to uphold, thus maintaining their identity and ongoing relationship to the service provider. The more affordances a service provider manages to convey, the more meaningful a relationship is considered to be. The affective dimension of cultural products, especially music, allows for interpersonal coordination, and emotional convergence, where value is created inter-subjectively through collectively shared practices, allowing us to share feelings and experiences and enjoying how the closeness of interpersonal relationships contribute to our everyday lives. The inter-subjective value creation process thus also works as a process of humanizing the virtual relationship. / Det ökade intresset för relationsmarknadsföring och Internets potential som plattform för relationsbyggande aktiviteter har gett upphov till nya sätt för företag att interagera med sina kunder, till exempel genom freemium-tjänster. Utifrån premisserna att relationen är en process av interaktionsögonblick av meningsskapande aktiviteter, förutsätts värde vara subjektivt, relativt och beroende av kontexten i vilken aktiviteten utspelas. Värde är således föränderligt givet kontexten och kan inte på förhand definieras utan att nyanser går förlorade. Trots Internets givna roll i samhällsutvecklingen, saknas fortfarande förståelse för vilka parametrar som bidrar till kunders intentioner att bygga relationer med online-tjänster. Då musikindustrin är väl etablerad på Internet, parallellt med att det skett en förändring av hur musik konsumeras, är det således motiverat att undersöka aktiviteter förenliga med en tjänst som distribuerar musik online, baserad på affärsmodellen freemium, då den akademiskt sätt ännu befinner sig i sin vagga. Studiens syfte är att ge insikter om virtuella relationer för hur online-tjänster med kulturellt innehåll ska förhålla sig till sina användare och bidra till den pågående akademiska diskussionen om hur värde manifesteras genom att belysa kontexters inverkan på relationer. För ett närmande av relationer till online-tjänster inom kulturella industrier, antogs för denna studie ett praktikperspektiv. I enlighet med aktionsforskning inhämtades primärdata genom deltagande observation i användarnas naturliga sociala miljö, baserat på ett målinriktat urval av informanter väl bekanta med studieobjektet - online-tjänsten Spotify. Resultatet visar på att värde inom virtuella relationer uppstår intersubjektivt mellan användare, är relativt mot tidigare erfarenheter, är föränderligt över tid, och kommer till uttryck genom individuella som kollektiva aktiviteter beroende av rådande kontext. Är användningen av tjänsten en del av den dagliga rutinen, blir användningen en del av användarens identitet, med påföljden att användaren är beredd att göra uppoffringar för att inte bryta rutinen och på så vis upprätthålla sin identitet och relation till tjänsten. Ju fler affordanser tjänster lyckas förmedla, desto mer meningsfull upplevs relationen. Den affektiva dimensionen som kulturella produkter för med sig, särskilt musik, möjliggör för interpersonal koordination och emotionell sammanstrålning, där intersubjektivt värdeskapande kollektivt tillskjuter värde i den gemensamma upplevelsen, då vi tillåter oss att dela våra känslor och upplevelser och njuta av den närhet som mänskliga relationer bidrar till i våra vardagliga liv. Det intersubjektiva värdeskapandet bidrar till ett förmänskligande av den virtuella relationen.
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