Global ETD Search

11	Design and performance analysis of cooperative relay systems Abadi, Tarla January 2015 (has links) Cooperative relay systems have emerged as promising techniques to boost the performance of wireless systems. Recent studies have confirmed that interferences, co-channel interferences (CCIs) and self-interferences, have a huge impact on cooperative relay systems and can cause significant performance degradation. Two problems were observed in this research. Firstly, previous studies on performance analysis of Amplify-and-Forward (AF) relay systems in presence of CCIs have only focused on a specific interference channel model. However, in practical design scenarios, such an assumption is not a realistic proposition. Secondly, analyses of overheads introduced by a time-based relay selection protocol in distributed cooperative systems have been based on an over-pessimistic assumption where all packets involved in a collision are destroyed. Nevertheless, collisions due to the protocol overheads cause the system performance to be degraded but this does not mean that the failure of end-to-end transmission certainly occurs. The thesis aims to analyse the performance of practical cooperative relay systems in the presence of CCIs and self-interferences, by developing exact mathematical methods. A new unified mathematical method for AF relay systems in presence of a random number of arbitrary non-identical CCIs was developed. The obtained new approach derived in terms of a moment generating function of the aggregate interferences' power led to the derivation of new explicit expressions. The new results greatly simplify evaluation of average error rates over diverse practical interference scenarios. Moreover, a new exact mathematical analysis for distributed cooperative relay systems employing a time-based relay selection protocol based on an accurate interference model was presented. This approach led to the derivation of new exact expressions for the spectral efficiency which accounts for both self-interferences and the protocol overheads as well as for different fading scenarios and arbitrary relay locations. This approach provided several advantages over direct approaches, one of which is that it significantly simplified averaging-out the joint random variables involved. 621.382
12	Gröna märkningar som kommunikationsverktyg : En kvalitativ studie ur företagsperspektiv Carlsson, Marie Kristina, Karlsson, Sofia January 2018 (has links) The purpose of this thesis is to examine the use of certified green labelling together with green labelling created by companies themselves, as a tool within green marketing communication to create credibility for green products. A focus has been placed on department stores within the retail sector. This thesis is a qualitative study conducted in an approach where induction and deduction have been combined. Data has mainly been collected by performing 10 semi-structured interviews with company representatives and experts within the chosen subject and industry. This study clearly shows that the perception of the use of both certified green labelling and green labels created by companies themselves, as a green marketing communication tool, is positive. However, the green labelling created by companies is preferred above certified green labelling for this purpose. The result of this study also shows very clearly that all three parts of the 3Cs´ principle are of importance to create an effective green marketing communication, and that green labelling, both of the earlier mentioned types, can be an effective tool to achieve this. Thus, it is of importance that the identified risks connected to the use of green labelling are minimized. / Denna uppsats är skriven ur ett företagsperspektiv och berör bruket av egna och certifierade gröna märkningar samt dess positiva och negativa aspekter i egenskap av kommunikationsverktyg för att skapa trovärdighet för gröna produkter. Ett fokus har lagts på övrig sällanköpshandel. En kombination av induktiv och deduktiv forskningsansats tillsammans med en kvalitativ undersökningsmetod har använts till denna uppsats. Data har främst samlats in genom tio semistrukturerade intervjuer med företagsrepresentanter och experter inom den valda branschen och ämnet. Denna studie visar tydligt att uppfattningen gällande bruket av både egna och certifierade gröna märkningar är positiv ur en kommunikationssynpunkt, men att de undersökta företagen föredrar egna gröna märkningar i detta syfte. I studien har det även tydligt framkommit att samtliga tre delar av 3C-principen är av vikt för att skapa en effektiv grön marknadskommunikation, och att gröna märkningar kan vara ett effektivt sätt för att uppnå detta. Dock behöver de identifierade riskerna kopplade till användningen av gröna märkningar minimeras och förslag hur detta kan göras har kunnat presenteras. Green marketing green communication green marketing communication green consumption green product green labelling green labels certified green labels csr corporate social responsibility sustainability Grön kommunikation grön marknadskommunikation grön marknadsföring grön konsumtion grön produkt hållbarhetsmärkning miljömärkning certifiering csr corporate social responsibility csr-initiativ hållbarhet Business Administration Företagsekonomi
13	Green Relationship Imad, Fadel 01 May 2014 (has links) Green Relationship is a design solution attempting to raise awareness toward the environment and reduce consumerism. Waste generation and pollution have become major concerns of many governments, municipalities, organizations and individuals around the world since they are affecting human wellbeing and the environment. As an MFA student with VCUQatar, I chose to use design to contribute in protecting the environment hoping to make a difference in life. The thesis includes a research and a design component. The research explores the recycling programs and facilities in Qatar, the governmental and private sector actions toward waste generation and collection, as well as precedent solutions applied around the world. Furthermore, it includes a survey on recycling to gather and analyze the community’s feed back in order to come up with a solution that aims to change people’s behavior toward waste generation and to promote green lifestyle. The design component defines the Green Relationship as the personal connection between the individual and the silent partner, “the environment.” It fulfills the basic survival needs, “food and water,” and the one and only independency need, “oxygen.” The elements of the Green Relationship are the projection of the generic relationships elements we know of through the theory of “Humimicing” that I introduce in my thesis. Humimicing is the design theory that mimics human innate attributes and behaviors to develop design concepts to be applied in different industries. Every element of the Green Relationship is visualized through a different design discipline similar to its nature. Therefore, interactive, product and critical designs are the mediums used to represent Green Communication, Care and Ethics respectively through public installation, experimentation and conceptual design definition. The thesis methodology, which is “Make it Personal,” concludes in creating the Green Relationship that aims to change the behavior of individuals and ultimately to reach out to the wider community. Under the maxim, “Green is not just a color; it is a Lifestyle,” the thesis promotes the use of design to inspire people, designers and manufacturers to consume less and generate less waste in order to save natural resources and the environment. Green Relationship Humimicing Environmental awareness Green Care Green Love Green Ethics Green Communication Green lifestyle Recycling facilities in Qatar Recycling programs in Qatar Recycling solutions Recycling survey in Qatar Adopt a plant Reduce consumerism Make it personal Design and behavioral change Design and group dynamics Environment Product design and environment Interactive design and environment Critical design and environment Breathing mask Talking plants Design for change Design and community Recycling Change behavior Design ethics Design and natural resources Design and 3D printing Design & Society Social behavior & Group dynamic Green care & Product design Green ethics & Critical design Greenship Green Matts Green Jewels Community gardening Beauty of trash Green relationship course Green relationship book Green portable nursery Design and environment Protect the environment Design an consumerism Multidisciplinary designs Imad Fadel Manufacturing and design Consume less Arduino boards Plants with visual communication Plants with audible communication Plants with birth certificate Art and Design Arts and Humanities

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