Search results

The purpose of this paper is to present an up-to-date survey on the non-orthogonal multiple access (NOMA) technique with co-operative strategy, a fast-evolving fifth-generation (5 G) technology. NOMA is used for serving many mobile users, both in power and code domains. This paper considers the power-domain NOMA, which is now discussed as NOMA.

The first part of the paper discusses NOMA-based cooperative relay systems using different relay strategies over different channel models. In various research works, the analytical expressions of many performance metrics were derived, measured and simulated for better performance of the NOMA systems. In the second part, a brief introduction to diversity techniques is discussed. The multiple input and multiple output system merged with cooperative NOMA technology, and its future challenges were also presented in this part. In the third part, the paper surveys some new conceptions such as cognitive radio, index modulation multiple access, space-shift keying and reconfigurable intelligent surface that can be combined with NOMA systems for better performance.

The paper presents a brief survey of diverse research projects being carried out in the field of NOMA. The paper also surveyed two different relaying strategies that were implemented in cooperative NOMA over different channels and compared several performance parameters that were evaluated and derived in these implementations.

The paper provides a scope for recognizable future work and presents a brief idea of the new techniques that can be united with NOMA for better performance in wireless systems.

This article explores consumers' attitudes to the trend of gourmet burgers, notably the gourmet burgers' combination of highbrow food (gourmet) and lowbrow food (fast food). The authors use the case of the NOMA cheeseburger from the iconic New Nordic restaurant NOMA.

The data set consists of interviews (n = 20) with urban Danish consumers attending the NOMA burger pop-up.

The analysis highlights an acceptance among informants of “gourmetfied” burgers. This signals a change in the culinary status of burgers in Danish food culture. The authors also discovered some ambivalence in relation to the highbrow-lowbrow negotiations: while all informants celebrate the casualization of NOMA during the burger pop-up, half of the informants found the burger underwhelming: it did not live up to the edginess of the NOMA brand.

The authors believe this research can inform people working with culinary highbrow-lowbrow mix in their food designs, notably in relation to developing and matching the relation between symbolic and material aspects of the food design.

The authors argue that the concept of transgression can help us theorize how consumers accept, refuse, and negotiate boundaries in relation to gourmet burgers, and more generally between food consumption mixing highbrow and lowbrow elements. More particularly, the authors propose to distinguish between symbolic, social, and material transgressions. This perspective might also be interesting for practitioners in the field.

Among the proposed radio access strategies for improving system execution in 5G networks, the non-orthogonal multiple access (NOMA) scheme is the prominent one.

Among the most fundamental NOMA methods, power-domain NOMA is the one where at the transmitter, superposition coding is used, and at the receiver, successive interference cancellation (SIC) is used. The importance of power allocation (PA) in achieving appreciable SIC and high system throughput cannot be overstated.

This research focuses on an outage probability analysis of NOMA downlink system under various channel conditions like Rayleigh, Rician and Nakagami-m fading channel. The system design's objectives, techniques and constraints for NOMA-based 5G networks' PA strategies are comprehensively studied.

From the results of this study, it is found that the outage probability performance of downlink ordered NOMA under Rayleigh, Rician and Nakagami-m fading channel was good.

Outage probability analysis of downlink ordered NOMA under various channel conditions like Rayleigh, Rician and Nakagami-m fading channels were employed. Though the performance of Nakagami-m fading channel is lesser compared to Rayleigh channel, the performance for user 1 and user 2 are good.

Non-orthogonal multiple access (NOMA) is a much hopeful scheme, which is deployed to enhance the spectral efficiency (SE) significantly, and it also enhances the massive access that has attained substantial concern from industrial and academic domains. However, the deployment of superposition coding (SC) at the receiver side resulted in interference. For reducing this interference, “multi-antenna NOMA” seems to be an emerging solution. Particularly, by using the channel state information at the transmitter, spatial beam forming could be deployed that eliminates the interference in an effective manner.

This survey analyzes the literature review and diverse techniques regarding the NOMA-based spatial modulation (SM) environment. It reviews a bunch of research papers and states a significant analysis. Initially, the analysis depicts various transmit antenna selection techniques that are contributed in different papers. This survey offers a comprehensive study regarding the chronological review and performance achievements in each contribution. The analytical review also concerns on the amplitude phase modulation (APM) selection schemes adopted in several contributions. Moreover, the objective functions adopted in the reviewed works are also analyzed. Finally, the survey extends with various research issues and its gaps that can be useful for the researchers to promote improved future works on NOMA-based SM.

This paper contributes to a review related to NOMA-based SM systems. Various techniques and performance measures adopted in each paper are analyzed and described in this survey. More particularly, the selection of transmission antenna and APM are also examined in this review work. Moreover, the defined objective function of each paper is also observed and made a chronological review as well. Finally, the research challenges along with the gaps on NOMA-based SM systems are also elaborated.

This paper presents a brief analysis of NOMA-based SM systems. To the best of the authors’ knowledge, this is the first work that uses NOMA-based SM systems to enhance SE.

The suggested work examines the latest developments such as the techniques employed for allocation of power, browser techniques, modern analysis and bandwidth efficiency of nonorthogonal multiple accesses (NOMA) in the network of 5G. Furthermore, the proposed work also illustrates the performance of NOMA when it is combined with various techniques of wireless communication namely network coding, multiple-input multiple-output (MIMO), space-time coding, collective communications, as well as many more. In the case of the MIMO system, the proposed research work specifically deals with a less complex recursive linear minimum mean square error (LMMSE) multiuser detector along with NOMA (MIMO-NOMA); here the multiple-antenna base station (BS) and multiple single-antenna users interact with each other instantaneously. Although LMMSE is a linear detector with a low intricacy, it performs poorly in multiuser identification because of the incompatibility between LMMSE identification and multiuser decoding. Thus, to obtain a desirable iterative identification rate, the proposed research work presents matching constraints among the decoders and identifiers of MIMO-NOMA.

To improve the performance in 5G technologies as well as in cellular communication, the NOMA technique is employed and contemplated as one of the best methodologies for accessing radio. The above-stated technique offers several advantages such as enhanced spectrum performance in contrast to the high-capacity orthogonal multiple access (OMA) approach that is also known as orthogonal frequency division multiple access (OFDMA). Code and power domain are some of the categories of the NOMA technique. The suggested research work mainly concentrates on the technique of NOMA, which is based on the power domain. This approach correspondingly makes use of superposition coding (SC) as well as successive interference cancellation (SIC) at source and recipient. For the fifth-generation applications, the network-level, as well as user-experienced data rate prerequisites, are successfully illustrated by various researchers.

The suggested combined methodology such as MIMO-NOMA demonstrates a synchronized iterative LMMSE system that can accomplish the optimized efficiency of symmetric MIMO NOMA with several users. To transmit the information from sender to the receiver, hybrid methodologies are confined to 2 × 2 as well as 4 × 4 antenna arrays, and thereby parameters such as PAPR, BER, SNR are analyzed and efficiency for various modulation strategies such as BPSK and QAM_j (j should vary from 8,16,32,64) are computed.

The proposed hybrid MIMO-NOMA methodologies are synchronized in terms of iterative process for optimization of LMMSE that can accomplish the optimized efficiency of symmetric for several users under different noisy conditions. From the obtained simulated results, it is found, there are 18%, 23% 16%, and 8% improvement in terms of Bit Error Rate (BER), Least Minimum Mean Squared Error (LMMSE), Peak to Average Power Ratio (PAPR), and capacity of channel respectively for Binary Phase Shift Key (BPSK) and Quadrature Amplitude Modulation (QAM) modulation techniques.

The purpose of this study was to examine the global perceptions of social equity in the fine dining business model as a result of the surprise announcement for the 2024 planned closure of the Michelin three-star restaurant, Noma.

This study used critical discourse analysis to inductively analyze 91 source documents retrieved through a lexical database search. The analysis yielded five overarching themes and six subthemes.

Findings from this study serve as a benchmark in retrospect for capturing a rapidly accelerating global conversation from January to March 2023 around the long-term viability and social sustainability of the fine dining business model.

Against the backdrop of labor challenges in the restaurant industry due to the Covid-19 pandemic and its aftermath, the announced closure of Noma precipitated criticism of the stage (unpaid intern) system and the intense pressures of attaining and maintaining Michelin star status.

Results from the discourse analysis suggest certification for fine dining restaurants, perhaps through the Michelin Guide, for demonstrating a commitment to social sustainability as a qualifier to achieve a Michelin star.

Findings from this research reveal a palpable change in societal tolerance for a more socially sustainable fine dining restaurant business model that advances equitable solutions for its workers while assuring the economic sustainability of restaurants.

This study drew upon a foodscape lens to reveal a juxtaposition between well-executed environmentally sustainable initiatives in the fine dining business model and the threats to the social sustainability among its workers.

This chapter will describe and assess initiatives by the University of Oslo (UoO) in Norway, the purpose of which has been to expand and improve collaboration with universities in Africa, notably the University of Dar es Salaam (UDSM) in Tanzania. UoO has a long history of North-South cooperation with a wide range of institutions on the African continent. In 2009, the UoO initiated a collaborative program with UDSM entitled “Program for Institutional Transformation Research Outreach” (PITRO) III, supported by Norwegian Agency for Development Co-operation (NORAD). The chapter will situate the UoO-UDSM cooperation in relation to Norwegian aid, and compare the program with previous programs, giving attention to the ways they were developed, how problems and challenges were tackled, and the probable consequences for Tanzania’s development. The chapter will compare and contrast the structure and experiences from these programs, and will point out strengths and weaknesses. Attention will be given to the rights-based approach, an important new dimension in North-South cooperation on higher education in Africa. It will be argued that the incorporation of this approach provides a basis for developing new policies and programs that strengthen African collaboration within research, education, and capacity building in higher education.

The purpose of this paper is to explore how vocational teachers’ everyday practices can constitute innovative learning spaces that help students to experience engagement and commitment towards education and thus increase their possibilities for completing their studies despite notable difficulties.

Based on two ethnographic field studies, we analyse vocational teaching situations in which teachers and students engage in daily remaking of the vocational educational training practice. It is argued that these everyday situations can be understood as innovative transformation of participation and practice.

The exploration of teachers’ practicing new learning spaces sheds light on innovation potential embedded in everyday educational practices. The paper thus challenges the celebration of radical innovation and argues that innovation emerges from everyday activities in which teachers succeed to balance continuities and discontinuities. Studying innovation as a balance between change and stability thus involves emerging, negotiated processes of learning and participation in everyday practices where people talk, interact and conduct their work and studies.

Based on the analysis, we argue that students’ engagement in education can be enhanced by transforming the educational settings on various parameters such as buildings, artefacts, emotions and experiences. Thus, innovation should be recognised as emerging everyday activities in which frontline workers like vocational teachers are drivers for innovation.

Innovative everyday activities are often invisible; however, we suggest that they can be studied and thus become visible by use of the analytic term: “boundary-pushing“.

The stabilization of earthen blocks improves their mechanical strength and avoids adobe construction erosion due to rainwater. However, the stabilization affects the thermal properties of the earthen blocks, and thus their capacity to provide adequate thermal comfort to occupants. This article examines the influence of cement and geopolymer binders on thermal comfort in compressed earthen buildings in hot and arid climates.

The test cell is on the building platform in Burkina Faso. The building is made of compressed earth blocks (CEB) consisting of laterite, water and binder. The thermal models of the building were implemented in EnergyPlus v9.0.1 software. Empirical validation is used to check whether the model used for the thermal dynamic simulation can reproduce with accuracy the thermal behavior in a real situation. The adaptive thermal comfort model of ASHRAE 55–2010 was used to assess thermal comfort in long-term hot and dry tropical conditions.

The results show that the CEB buildings remain hot despite the use of cement or geopolymer binder. Indeed, with both cement and geopolymer binders, on a daily basis, 19 h and 15 h are uncomfortable during, respectively, the hot and cold seasons. An increase of 1% in cement content raises the comfort hours by 9.2 h during the hot season and 11.7 h during the cold season. Hence, the comfort time varies linearly with the cement content in the building material. Moreover, there is no linear relationship between comfort time and geopolymer rate.

Complementary work should also assess the influence of stabilization on building humidity levels. In fact, earthen materials are very sensitive to outdoor humidity and indoor humidity affects thermal comfort even if it is not taken into account in the ASHRAE adaptive thermal comfort model.

The present study will certainly contribute to a better valorization of clay potential in countries with similar climatic conditions.

The use of geopolymer binder is a suitable ecological option to replace the cement binder. It is important to mention that nighttime comfort can be increased through passive strategies such as natural ventilation.

Most CEB material stabilization analyses including cement and geopolymer ones were mostly investigated at the laboratory scale and less at the building scale. Also, the influence of the binder rate on the thermal performance of buildings made of cement and geopolymer has not yet been assessed. This paper fills this gap of knowledge by assessing the impact of cement and geopolymer binder rates on the thermal comfort of CEB dwellings.

This paper aims to develop place branding theory toward the accommodation of a multifaceted understanding of value and value negotiation by Nordic branding actors by way of answering the following question: How is Nordicness appropriated by Nordic branding actors and what value regimes are drawn on in the process?

Using field data from a selection of branding actors and sectors in Norway, Sweden and Denmark, a qualitative analysis of Nordic branding performances is used to unpack the negotiations of valuation of worth.

The analysis identified three principle orders of worth behind Nordicness (civic, green and inspired) that are negotiated through compromises between orders of industry and domestic and by contesting the orders of fame and market. The findings indicate how Nordicness is performed as principle worths and tensions and how these are rendered meaningful as propositions of “value as difference” as they are performed in practice by brand actors.

Several studies focus on how place branding “adds value;” however, few studies have been aimed at unpacking how a “value universe” is negotiated as a more complex understanding of worth or “value.” This study thus opens up for branding heterogeneity, which signifies awareness of competing notions and orders of worth among small- and medium-sized enterprises and other central stakeholders; this could further inspire interdisciplinary, value-based research into the potential contingencies of (product) branding and place branding in other contexts and regions.