We develop an efficient parallel distributed algorithm for matrix completion, named NOMAD (Non-locking, stOchastic Multi-machine algorithm for Asynchronous and Decentralized matrix completion). NOMAD is a decentralized algorithm with non-blocking communication between processors. One of the key features of NOMAD is that the ownership of a variable is asynchronously transferred between processors in a decentralized fashion. As a consequence it is a lock-free parallel algorithm. In spite of being asynchronous, the variable updates of NOMAD are serializable, that is, there is an equivalent update ordering in a serial implementation. NOMAD outperforms synchronous algorithms which require explicit bulk synchronization after every iteration: our extensive empirical evaluation shows that not only does our algorithm perform well in distributed setting on commodity hardware, but also outperforms state-of-the-art algorithms on a HPC cluster both in multi-core and distributed memory settings.
Recent studies have shown a range of co-residency side channels that can be used to extract private information from cloud clients. Unfortunately, addressing these side channels often requires detailed attack-specific fixes that require significant modifications to hardware, client virtual machines (VM), or hypervisors. Furthermore, these solutions cannot be generalized to future side channels. Barring extreme solutions such as single tenancy which sacrifices the multiplexing benefits of cloud computing, such side channels will continue to affect critical services. In this work, we present Nomad, a system that offers vector-agnostic defense against known and future side channels. Nomad envisions a provider-assisted VM migration service, applying the moving target defense philosophy to bound the information leakage due to side channels. In designing Nomad, we make four key contributions: (1) a formal model to capture information leakage via side channels in shared cloud deployments; (2) identifying provider-assisted VM migration as a robust defense for arbitrary side channels; (3) a scalable online VM migration heuristic that can handle large datacenter workloads; and (4) a practical implementation in OpenStack. We show that Nomad is scalable to large cloud deployments, achieves near-optimal information leakage subject to constraints on migration overhead, and imposes minimal performance degradation for typical cloud applications such as web services and Hadoop MapReduce.
Materials science research is becoming increasingly data-driven, which requires more effort to manage, share, and publish data. NOMAD is a web-based application that provides data management for materials science research data. In addition to core data management functions like uploading and sharing files, NOMAD allows for entering structured data using customizable forms providing the software with electronic laboratory notebook (ELN) functionalities. It automatically extracts rich meta-data from supported file formats, normalizes and converts data from these formats, and provides a faceted search with materials science-specific filters based on extracted meta-data. NOMAD integrates data analysis and machine learning tools.<br>Installations of NOMAD can be connected to share data between research institutes and can<br>publish data to an open central NOMAD service. The NOMAD software is distributed as a<br>Docker image to create data management services and as a Python package to automate the client’s use of these services.
Abstract The Novel Materials Discovery (NOMAD) Laboratory is a user-driven platform for sharing and exploiting computational materials science data. It accounts for the various aspects of data being a crucial raw material and most relevant to accelerate materials research and engineering. NOMAD, with the NOMAD Repository, and its code-independent and normalized form, the NOMAD Archive, comprises the worldwide largest data collection of this field. Based on its findable accessible, interoperable, reusable data infrastructure, various services are offered, comprising advanced visualization, the NOMAD Encyclopedia, and artificial-intelligence tools. The latter are realized in the NOMAD Analytics Toolkit. Prerequisite for all this is the NOMAD metadata, a unique and thorough description of the data, that are produced by all important computer codes of the community. Uploaded data are tagged by a persistent identifier, and users can also request a digital object identifier to make data citable. Developments and advancements of parsers and metadata are organized jointly with users and code developers. In this work, we review the NOMAD concept and implementation, highlight its orthogonality to and synergistic interplay with other data collections, and provide an outlook regarding ongoing and future developments.
Individuals in the creative sector often pursue the idea of the location-independent style of living and working (Müller, A. 2016. The digital nomad: Buzzword or research category? Transnational Social Review, 6(3), 344–348). Digital nomads represent a modern “knowmad” society (Moravec, J. W. 2013. Knowmad society: The “new” work and education. On the Horizon, 21(2), 79–83), whose boundaries between leisure, travel, and work appear blurred (Reichenberger, I. 2018. Digital nomads–a quest for holistic freedom in work and leisure. Annals of Leisure Research, 21(3), 364–380). This new type of fluid workforce tends to merge itself with the selected geographic area or environment for a brief period of time, and by that utilizing its logistic and digital infrastructure to maintain an individualized lifestyle (Richards, G. 2015. The new global nomads: Youth travel in a globalizing world. Tourism Recreation Research, 40(3), 340–352). Digital nomadism has brought upon a new form of creative tourism (Putra, G. B., & Agirachman, F. A. 2016. Urban coworking space: Creative tourism in digital nomads perspective. In Proceedings of Arte-Polis 6 International Conference (pp. 169–178)) that emancipates the involvement of individuals in the creative life of the destination and interaction with local communities by exchanging skill sets and ideas in a synergetic way (Richards, G., & Marques, L. 2012. Exploring creative tourism: Editors Iintroduction. Journal of Tourism Consumption and Practice Volume, 4(2), 1–11) by frequently using local coworking spaces. However, the motivational factors behind the usage of local coworking spaces remain unclear, as do the benefits offered by these flexible office environments. This paper thus investigates the popularization of digital nomadism and the influence of the digital nomad lifestyle on the work-leisure balance that appears to be affected by the use of coworking spaces.
Contents: Rural markets in North Africa and the political economy of the Roman Empire The undecemprimi in Roman Africa The structure of local society in the early Maghrib: the elders The Elder Plinya (TM)s African geography The formation of Africa Proconsularis a Eaters of flesh, drinkers of milka (TM): the ancient Mediterranean ideology of the pastoral nomad Fear and loathing: the nomad menace and Roman Africa Autonomy and tribute: mountain and plain in Mauretania Tingitana Soldiers and society: the army in Numidia The elders of Christian Africa African Christianity: disputes, definitions and a Donatistsa (TM) Critical Bibliographical Addenda Index.
Increasing youth travel has led to young people being labelled as ‘nomads’. This paper examines the phenomenon of youth nomadism in the tourism literature as well as examining recent empirical evidence. A review of the literature around youth nomadism identifies two major themes: analyses of the growth and development of youth travel niches, such as backpacking, volunteer tourism and educational exchange, and broader approaches linked to the rise of the mobilities paradigm. A major global survey of youth travel (34,000 respondents) indicates three major travel styles related to different forms of ‘nomadism’: the backpacker, the flashpacker and the global nomad. The traditional backpacker can be seen as a form of ‘neo-tribe’, gathering in self-sufficient enclaves. In contrast, the flashpacker, or ‘digital nomad', utilizes existing digital and logistic infrastructure to maintain a fluid, individualized lifestyle. The global nomad, or ‘location independent traveller’, tries to integrate with the local community, while trying to avoid the strictures of ‘system’.
«… the Menace is loose again, the Hell’s Angels, the hundred carat headline, running fast and loud on the early morning freeway, low in the saddle, nobody smiles, jamming crazy through traffic and ninety miles an hour down the centre stripe, missing by inches … like Genghis Khan on an iron horse, a monster steed with fiery anus, flat out through the eye of a beer can and up your daughter’s leg with no quarter asked and none given … » 1
Abstract This paper defines the rapidly emerging mobile lifestyle of digital nomads, who work while traveling and travel while working. Digital nomadism is driven by important societal changes, such as the ubiquity of mobility and technology in everyday lives and increasingly flexible and precarious employment. Despite the growing prevalence of this lifestyle, there is a lack of common understanding of and holistic perspective on the phenomenon. The emerging literature on digital nomadism is fragmented and scattered through different disciplines and perspectives. This paper looks into digital nomadism against the array of contemporary lifestyle-led mobilities and location independent work to develop a comprehensive perspective of the phenomenon. The paper also suggests a conceptual framing of digital nomadism within lifestyle mobilities. A limited number of empirical studies on digital nomads narrows the scope of analytical discussion in this paper. Thus, the paper defines aspects and directions for further conceptualization of the phenomenon.
This article focuses on a theoretical discussion about the interrelations between global hypermobility and subjectivity formation. Based on ethnographic fieldwork among expatriates that circulate through global circuits of countercultural lifestyle, the study initially evinces the cultural and conceptual significance of global nomadism. It then detects conceptual limitations for the investigation of fluidic and metamorphic formations in global studies. Through a dialogue between the anthropology of nomadism and philosophy of nomadology, the article then seeks to integrate tropes of fluidity, rootlessness and aesthetic reflexivity into an ideal‐type of postidentitarian mobility (neo‐nomadism), a device for investigating the cultural effects of hypermobility on self, identity and sociality. It includes methodological notes on nomadic ethnography. The article concludes that the neo‐nomad is both a phenomenon and a concept that allows us to rethink models of subjectivity formation in globalization.
We estimate that there may be up to ∼105 compact objects in the mass range 10−8–10−2 M⊙ per-main-sequence star that are unbound to a host star in the Galaxy. We refer to these objects as nomads; in the literature a subset of these are sometimes called free-floating or rogue planets. Our estimate for the number of Galactic nomads is consistent with a smooth extrapolation of the mass function of unbound objects above the Jupiter-mass scale, the stellar mass density limit and the metallicity of the interstellar medium. We analyse the prospects for detecting nomads via Galactic microlensing. The Wide-Field Infrared Survey Telescope will measure the number of nomads per-main-sequence star greater than the mass of Jupiter to ∼13 per cent, and the corresponding number greater than the mass of Mars to ∼25 per cent. All-sky surveys such as Gaia and Large Synoptic Survey Telescope can identify nomads greater than about the mass of Jupiter. We suggest a dedicated drift scanning telescope that covers approximately 100 deg2 in the Southern hemisphere could identify nomads via microlensing of bright stars with characteristic time-scales of tens to hundreds of seconds.
ABSTRACT Digital nomads are portrayed as young professionals working solely in an online environment while leading a location independent and often travel reliant lifestyle where the boundaries between work, leisure and travel appear blurred. This paper aims to conceptualize the digital nomad phenomenon by establishing a definition of digital nomads. Further, it explores their motivations for adapting this lifestyle and how these are addressed in practice, and examines how work, leisure and travel are interpreted. Digital nomads aim to create a holistic lifestyle characterized by comprehensive freedom where both areas of life are regarded as equally enjoyable and do so through professional, spatial and personal freedom. Ideally, digital nomads perceive work not as an imposed obligation but regard it – much as their leisure activities – as intrinsically motivated and fulfilling. Although crucial for a positive perception of this lifestyle, travel comes with personal challenges that are considered a different type of work.
Nomads in Archaeology addresses the problem of how to study mobile peoples using archaeological techniques. It therefore deals not only with the prehistory and archaeology of nomads but also with current issues in theory and methodology, particularly the concept of 'site structure'. This is the first volume to be devoted exclusively to nomad archaeology. It includes sections on the history and origins of pastoral nomad societies, the economics of pastoralism, social organisation of pastoral communities and the 'visibility threshold' of nomad material culture. Examples and case studies are drawn from field work and published sources primarily in Turkey and Iran.
In 1997, Tsugio Makimoto and David Manners published their future-looking manifesto Digital Nomad that, decades later, would present as a manifesto for a lifestyle movement. At the time, businesses and the US government were interested in looking at tele-commuting, productivity, and work-family balance. Critiques of a neoliberal economy provide insight into understanding the context of freelance and online, piecemeal employ- ment. This article examines the types of employment that digital nomads engage in, based on in-depth interviews with thirty-eight self-identified digital nomads. The participants mostly originate from wealthy, industrialized nations, and have many class privileges, but are underemployed compared to what their socio-economic status would historically suggest. As most participants are in the Millennial Generation, an overview of the shifting socio-economic status of this age-cohort is examined in the United States, United Kingdom, Australia, and the European Union – notably their high educational achievements and increasingly precarious employment status. Many of the nomads were working part-time with their own micro-business, with few able to maintain full-time employment. Few have bene- fits such as healthcare, retirement, unemployment insurance, or family leave. While “freedom” is touted as the benefit of gig-work, by both industry management and digital nomad enthusiasts, this lifestyle marks a shift towards precarious employment – itself not a basis for economic freedom, nor security.
Abstract Digital nomads are knowledge workers who actively seek a lifestyle of freedom, using technology to perform their work remotely, traveling far and wide, and moving as often as they like. They have left their local coffee shops behind and now proudly post their “office of the day” photos from exotic locales, but what do their lives really look like? This book takes readers into an expatriate digital nomad community in Bali, Indonesia, and presents new manifestations of classic questions about community, creativity, and the role of place in the modern human ecosystem. It explains why digital nomads leave their creative class cities behind, arguing that creative class workers, though successful, often feel that their “world class cities” and desirable jobs are anything but paradise. This book follows nomads’ work transitions into freelancing, entrepreneurship, and remote jobs. Then, it explains how digital nomads create a fluid but intimate place-based community abroad in the company of like-minded others. It shows why and how individuals blend in-person and online activity in their pursuit of community and freedom. This book provides insights into individuals’ efforts to live lives and create work identities that balance freedom, community, and creative fulfillment in the digital age, and it provides insights into a larger cultural discourse about the future of cities, work, and community.
The NOMAD experiment is a short base-line search for νμ − ντ oscillations in the CERN neutrino beam. The ντ's are searched for through their charged current interactions followed by the observation of the resulting τ− through its electronic, muonic or hadronic decays. These decays are recognized using kinematical criteria necessitating the use of a light target which enables the reconstruction of individual particles produced in the neutrino interactions. This paper describes the various components of the NOMAD detector: the target and muon drift chambers, the electromagnetic and hadronic calorimeters, the preshower and transition radiation detectors and the veto and trigger scintillation counters. The beam and data acquisition system are also described. The quality of the reconstruction and individual particles is demonstrated through the ability of NOMAD to observe Ks0's, Λ0's and π0's. Finally, the observation of τ− through its electronic decay being one of the most promising channels in the search, the identification of electrons in NOMAD is discussed.
The interaction between the Eurasian pastoral nomads - most famously the Mongols and Turks - and the surrounding sedentary societies is a major theme in world history. Nomads were not only raiders and conquerors, but also transmitted commodities, ideas, technologies and other cultural items. At the same time, their sedentary neighbours affected the nomads, in such aspects as religion, technology, and political culture. The essays in this volume use a broad comparative approach that highlights the multifarious nature of nomadic society and its changing relations with the sedentary world in the vicinity of China, Russia and the Middle East, from antiquity into the contemporary world.
Global Nomads provides a unique introduction to the globalization of countercultures, a topic largely unknown in and outside academia. Anthony D’Andrea examines the social life of mobile expatriates who live within a global circuit of countercultural practice in paradoxical paradises. Based on nomadic fieldwork across Spain and India, the study analyzes how and why these post-metropolitan subjects reject the homeland in order to shape an alternative lifestyle. They become artists, therapists, exotic traders and bohemian workers seeking to integrate labor, mobility and spirituality within a cosmopolitan culture of expressive individualism. These countercultural formations, however, unfold under neo-liberal regimes that appropriate utopian spaces, practices and imaginaries as commodities for tourism, entertainment and media consumption. In order to understand the paradoxical globalization of countercultures, Global Nomads develops a dialogue between global and critical studies by introducing the concept of 'neo-nomadism' which seeks to overcome some of the shortcomings in studies of globalization. This book is an essential aide for undergraduate, postgraduate and research students of Sociology, Anthropology of Globalization, Cultural Studies and Tourism Studies.
We have studied the muon neutrino and antineutrino quasi-elastic (QEL) scattering reactions (ν μ n→μ − p and $\bar{\nu }_{\mu}p\to\mu^{+}n$ ) using a set of experimental data collected by the NOMAD Collaboration. We have performed measurements of the cross-section of these processes on a nuclear target (mainly carbon) normalizing it to the total ν μ ( $\bar{\nu}_{\mu}$ ) charged-current cross section. The results for the flux-averaged QEL cross sections in the (anti)neutrino energy interval 3–100 GeV are $\langle \sigma_{\mathrm{qel}}\rangle_{\nu_{\mu}}=(0.92\pm0.02(\mathrm{stat})\pm0.06(\mathrm{syst}))\times10^{-38}~\mathrm{cm}^{2}$ and $\langle\sigma_{\mathrm{qel}}\rangle_{\bar{\nu}_{\mu}}=(0.81\pm0.05(\mathrm{stat})\pm0.09(\mathrm{syst}))\times10^{-38}~\mathrm{cm}^{2}$ for neutrino and antineutrino, respectively. The axial mass parameter M A was extracted from the measured quasi-elastic neutrino cross section. The corresponding result is M A =1.05±0.02(stat)±0.06(syst) GeV. It is consistent with the axial mass values recalculated from the antineutrino cross section and extracted from the pure Q 2 shape analysis of the high purity sample of ν μ quasi-elastic 2-track events, but has smaller systematic error and should be quoted as the main result of this work. Our measured M A is found to be in good agreement with the world average value obtained in previous deuterium filled bubble chamber experiments. The NOMAD measurement of M A is lower than those recently published by K2K and MiniBooNE Collaborations. However, within the large errors quoted by these experiments on M A , these results are compatible with the more precise NOMAD value.
Abstract The digital nomad idea of freedom is often a generalised and subjective notion of freedom that imagines a lifestyle and future where the tensions between work and leisure melt away. This paper finds that in practice, digital nomadism is not always experienced as autonomous and free but is a way of living that requires high levels of discipline and self-discipline. The research suggests that digital nomads often overlook the role of disciplining practices when first starting out, and do not foresee how working in sites of leisure and tourism might make managing a balance between work and non-work problematic. Longitudinal ethnographic fieldwork examines the extent of these disciplining practices and reveals that they are utilised to keep work and leisure time separate.