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Message logging is the tool of choice to stay informed about the health of a machine or application. These messages, called logs, are used for various purposes, including system management, performance optimization, investigation of suspicious activities, and more generally analysis and debugging. Operations that demand a level of reliability at least equivalent to the emphasis placed on them during their use. However, the syslog protocol was originally designed to work exclusively over UDP. Traditional applications, which have not benefited from the a postorio additions such as TCP, are forced to communicate over a network that is not suitable for them (corrupted or lost messages, reordering, or unreachable server) and over which they have no control. The objective of this work is to develop a resilient syslog relay that will operate downstream of applications, collect their syslog messages and send them to a central syslog server. Several mechanisms such as the use of the TCP protocol and the retention of messages in case of connection loss guarantee reliability. Topics related to message ordering and strategies in case of an overload are also discussed and several approaches are presented to either mitigate or regulate their impact. The implementation, in the form of a prototype, is deployed inside a router running the Cisco IOx environment and features the modern syslog message engine, rsyslog. The model is evaluated on the basis of its functionality and performance in a test environment with network quality such as 3G cellular and EDGE. Several configurations are proposed depending on the type of usage involved. Although the solution does not cover all possible and imaginable problems, such as router outages, the evaluations demonstrate the efficiency and scalability of the proposed solution, which can for example easily handle several tens of thousands of messages per second with a very low resource footprint.

docker --- cisco --- iox --- syslog --- log --- rsyslog --- aarch64 --- linux --- event --- relay --- reliable --- store and forward --- kibana --- elasticsearch --- message generator --- python --- router --- cellular --- network --- TCP --- UDP --- TLS --- configuration --- ioxclient --- chronological order --- timestamp --- 3G --- EDGE --- performance --- testbed --- wanem --- downtime, --- recover --- permanent storage --- open source --- central server --- server --- low footprint --- Ingénierie, informatique & technologie > Sciences informatiques

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This open access book explores implications of the digital revolution for migration scholars’ methodological toolkit. New information and communication technologies hold considerable potential to improve the quality of migration research by originating previously non-viable solutions to a myriad of methodological challenges in this field of study. Combining cutting-edge migration scholarship and methodological expertise, the book addresses a range of crucial issues related to both researcher-designed data collections and the secondary use of “big data”, highlighting opportunities as well as challenges and limitations. A valuable source for students and scholars engaged in migration research, the book will also be of keen interest to policymakers.

Quantitative migration research --- Available administrative sources --- Forced migrants in the global North and South --- General population surveys --- Reliable quantitative information --- Migratory flows and populations --- Sampling and data collection --- Intercultural differences --- Survey design issues --- Absence of suitable sampling frames --- Target population --- Migration research --- Internally displaced persons --- Social networking sites --- Internet survey --- Data collection --- Transnational human mobility

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The Internet of Things (IoT) has attracted much attention from society, industry and academia as a promising technology that can enhance day to day activities, and the creation of new business models, products and services, and serve as a broad source of research topics and ideas. A future digital society is envisioned, composed of numerous wireless connected sensors and devices. Driven by huge demand, the massive IoT (mIoT) or massive machine type communication (mMTC) has been identified as one of the three main communication scenarios for 5G. In addition to connectivity, computing and storage and data management are also long-standing issues for low-cost devices and sensors. The book is a collection of outstanding technical research and industrial papers covering new research results, with a wide range of features within the 5G-and-beyond framework. It provides a range of discussions of the major research challenges and achievements within this topic.

fog computing --- heterogeneous networks --- distributed mechanism --- energy efficiency --- scheduling --- CSMA --- throughput --- grant-free --- D2D communication --- MAC --- Industrial Internet of Things --- estimation --- 5G --- survey --- liquid detection --- power control --- sensor --- SINR --- radio propagation --- MU association --- Raspberry Pi --- reliability --- latency --- deterministic --- Industry 4.0 --- stochastic geometry --- dielectric constant --- Cyber Physical System --- IoT --- successive interference cancellation --- URLLC --- end-to-end delay --- resource allocation --- polynomial interpolation --- industrial automation --- cloud computing --- mMTC --- smart factory --- deployment --- ultra-reliable and low-latency communications --- PHY --- aperiodic traffic --- NB-IoT --- irregular repetition slotted ALOHA --- edge computing --- time-critical --- eMBB --- medium access control --- M2M --- Internet of Things --- internet of things --- sensor network --- random access --- smart devices --- non-orthogonal multiple access --- USRP --- WCI --- narrowband --- congestion

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Currently, nano/microparticles are widely used in various fields. Silver particles are one of the most vital of the various particles, due to their unique optical–physical–chemical properties. The developed materials have been proposed for use in various fields such as in biosensors, diagnostics, imaging, catalysts, solar cells, and as antibacterials. Their unique, size-dependent plasmonic properties render the particles superior in biomedical applications. This importance of silver materials led to the first edition of Silver Nano/Microparticles: Modification and Applications, which was successfully published last year with ten outstanding papers. This second edition of the Special Issue also provides original contributions detailing the synthesis, modification, and applications of silver materials. Eleven outstanding papers which describe examples of the most recent advances in silver nano/microparticles are included.

Technology: general issues --- antiviral property --- healthcare workers (HCWs) --- medical application --- microbicidal property --- silver nanoparticles (Ag NPs) --- cytotoxicity --- silver nanoparticles --- Candida albicans --- poly(methyl methacrylate) --- dental prostheses --- ultrasensitive detection --- thiram --- internal standard --- gold–silver-alloy-embedded silica nanoparticles --- bamboo --- Ag/TiO2 nanocomposites --- self-sacrificing reduction --- antifungal activity --- cyclophanes --- resorcin[4]arenes --- calix[n]arenes --- thiacalix[n]arenes --- pillar[n]arenes --- self-assembly --- silver nanostructures --- silver islands film --- silver deposition --- metal enhanced luminescence --- silver nanowires --- nanomaterials --- biocompatibility --- AgNP --- peptide array --- biomineralization --- green synthesis --- SIF --- photosynthetic complexes --- biohybrid structures --- MEF --- healthcare workers --- hydroxyl radical --- microbicidal activity --- silver nanoparticles (AgNPs) --- ultraviolet (UV) irradiation --- histamine --- fish --- gold-silver alloy-embedded silica nanoparticles --- surface-enhanced Raman scattering (SERS) --- reliable and sensitive detection --- n/a --- gold-silver-alloy-embedded silica nanoparticles

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Currently, nano/microparticles are widely used in various fields. Silver particles are one of the most vital of the various particles, due to their unique optical–physical–chemical properties. The developed materials have been proposed for use in various fields such as in biosensors, diagnostics, imaging, catalysts, solar cells, and as antibacterials. Their unique, size-dependent plasmonic properties render the particles superior in biomedical applications. This importance of silver materials led to the first edition of Silver Nano/Microparticles: Modification and Applications, which was successfully published last year with ten outstanding papers. This second edition of the Special Issue also provides original contributions detailing the synthesis, modification, and applications of silver materials. Eleven outstanding papers which describe examples of the most recent advances in silver nano/microparticles are included.

Technology: general issues --- antiviral property --- healthcare workers (HCWs) --- medical application --- microbicidal property --- silver nanoparticles (Ag NPs) --- cytotoxicity --- silver nanoparticles --- Candida albicans --- poly(methyl methacrylate) --- dental prostheses --- ultrasensitive detection --- thiram --- internal standard --- gold–silver-alloy-embedded silica nanoparticles --- bamboo --- Ag/TiO2 nanocomposites --- self-sacrificing reduction --- antifungal activity --- cyclophanes --- resorcin[4]arenes --- calix[n]arenes --- thiacalix[n]arenes --- pillar[n]arenes --- self-assembly --- silver nanostructures --- silver islands film --- silver deposition --- metal enhanced luminescence --- silver nanowires --- nanomaterials --- biocompatibility --- AgNP --- peptide array --- biomineralization --- green synthesis --- SIF --- photosynthetic complexes --- biohybrid structures --- MEF --- healthcare workers --- hydroxyl radical --- microbicidal activity --- silver nanoparticles (AgNPs) --- ultraviolet (UV) irradiation --- histamine --- fish --- gold-silver alloy-embedded silica nanoparticles --- surface-enhanced Raman scattering (SERS) --- reliable and sensitive detection --- n/a --- gold-silver-alloy-embedded silica nanoparticles