Collective intelligence within web video

AbstractWe present a user-based approach for detecting interesting video segments through simple signal processing of users’ collective interactions with the video player (e.g., seek/scrub, play, pause). Previous research has focused on content-based systems that have the benefit of analyzing a video without user interactions, but they are monolithic, because the resulting key-frames are the same regardless of the user preferences. We developed the open-source SocialSkip system on a modular cloud-based architecture and analyzed hundreds of user interactions within difficult video genres (lecture, how-to, documentary) by modeling them as user interest time series. We found that the replaying activity is better than the skipping forward one in matching the semantics of a video, and that all interesting video segments can be found within a factor of two times the average user skipping step from the local maximums of the replay time series. The concept of simple signal processing of implicit user interactions within video could be applied to any type of Web video system (e.g., TV, desktop, tablet), in order to improve the user navigation experience with dynamic and personalized key-frames.</jats:p

Acquired acid adaptation of Listeria monocytogenes during its planktonic growth enhances subsequent survival of its sessile population to disinfection with natural organic compounds

In this study, the possible influence of acid adaptation of L. (monocytogenes cells during their planktonic growth on their subsequent resistance against some such compounds (i.e. lactic acid, essential oil or hydrosol of Mediterranean spice Satureja( thymbra) nupon their attachment to SS, was evaluated by simultaneously using the bead vortexing technique and a conductance method

P3-21 Comparative Proteomic Analysis of Salmonella enterica serovar Enteritidis PT4 Planktonic and Sessile Cells on Stainless Steel Surface Provides New Insights in Protein Determinants Involved in the Maintenance of a Biofilm community

In order to better understand the cellular mechanisms sustaining a surface-associated lifestyle of S. Enteritidis in food related environments, the differential protein patterns of this bacterium cultivated as biofilm on SS versus planktonic mode were comparatively studied in the present work

Suburbanization in Greece: The informal transformation of Maroussi into the economic hub of Athens

Greek cities are a seminal part of the Mediterranean urbanization thesis. Corresponding features include the comparatively belated occurrence of urban in-migration, the particularity of the urban pull factors, and the unplanned nature of urban expansion. The considerable and extensive urbanisation wave note in Greece in the post-war period was part of a wider transformative process, characterized by the shifting economic orientation from a prevailing agrarian sector towards urban-industrial economies. The limited manifestation of internal economies of scale in industrial firms, and the few signs of economies of localisation affecting the spatial pattern of industrial development point to the weight of urbanisation as the major factor in industrialisation. In order to maintain and enhance the urbanization/industrialization process, the authoritarian national leadership of the time eased off regulatory planning controls, tacitly facilitating the rapid yet unordered expansion of cities. The conceptualization of the ensuing urban sprawl as an unsustainable trend occurred decades later, following the country?s return to democracy (1974). The path dependent qualities of urban growth management, however, mitigated the effectiveness of the respective efforts. This paper explores the sprawling tendencies of Greek cities, commenting on the limited ability of the regulatory planning framework to influence and direct urban expansion. The Athenian municipality of Maroussi is used as a case in point. Maroussi was a rural area of the Athenian hinterland, turned gradually into the city?s major economic centre. Fieldwork research in Maroussi underscores the informal qualities of Greek suburbanization. The paper is organized in three. The first part discusses the growth of Greek cities in the post-war years, portraying the popular colonization of peri-urban land. The second part outlines the policy changes introduced since the early 1980s, part of an attempt to delineate urban growth. Key amongst them, the launch of a series of state spatial restructuring reforms, aiming to equip local authorities with the necessary means to control urban sprawl. The third part of the paper looks closely at Maroussi, mapping the process and discussing the consequences of an urban expansion mode based on unhindered market forces and unregulated private initiative

Bioactive natural products: facts, applications, and challenges

License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Today, there are a strong debate and interest regarding the safety aspects of chemical preservatives addedwidely inmany food products to prevent mainly growth of spoilage and pathogenic microbes. Synthetic compounds are considered responsible for carcinogenic and teratogenic attributes and residual toxicity. To avoid the aforementioned problems, consumers and authorities have increased pressure on food manufacturers to substitute the harmful artificial additives with alternative, more effective, nontoxic, and natural sub-stances. In this context, the use of natural compounds with antimicrobial action presents an intriguing case. Natural antioxidants also demonstrate a wide range of biological and pharmacological activities and are considered to have bene

User-based key frame detection in social web video

Video search results and suggested videos on web sites are represented with a video thumbnail, which is manually selected by the video up-loader among three randomly generated ones (e.g., YouTube). In contrast, we present a grounded user-based approach for automatically detecting interesting key-frames within a video through aggregated users' replay interactions with the video player. Previous research has focused on content-based systems that have the benefit of analyzing a video without user interactions, but they are monolithic, because the resulting video thumbnails are the same regardless of the user preferences. We constructed a user interest function, which is based on aggregate video replays, and analyzed hundreds of user interactions. We found that the local maximum of the replaying activity stands for the semantics of information rich videos, such as lecture, and how-to. The concept of user-based key-frame detection could be applied to any video on the web, in order to generate a user-based and dynamic video thumbnail in search results.Comment: 4 pages, 4 figure