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Search Results: 1 - 10 of 1959 matches for " Alexey Vinel "
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Evaluating IEEE 802.15.4 for Cyber-Physical Systems
Feng Xia,Alexey Vinel,Ruixia Gao,Linqiang Wang
EURASIP Journal on Wireless Communications and Networking , 2011, DOI: 10.1155/2011/596397
Abstract:
Evaluating IEEE 802.15.4 for Cyber-Physical Systems
Xia Feng,Vinel Alexey,Gao Ruixia,Wang Linqiang
EURASIP Journal on Wireless Communications and Networking , 2011,
Abstract: With rapid advancements in sensing, networking, and computing technologies, recent years have witnessed the emergence of cyber-physical systems (CPS) in a broad range of application domains. CPS is a new class of engineered systems that features the integration of computation, communications, and control. In contrast to general-purpose computing systems, many cyber-physical applications are safety critical. These applications impose considerable requirements on quality of service (QoS) of the employed networking infrastruture. Since IEEE 802.15.4 has been widely considered as a suitable protocol for CPS over wireless sensor and actuator networks, it is of vital importance to evaluate its performance extensively. Serving for this purpose, this paper will analyze the performance of IEEE 802.15.4 standard operating in different modes respectively. Extensive simulations have been conducted to examine how network QoS will be impacted by some critical parameters. The results are presented and analyzed, which provide some useful insights for network parameter configuration and optimization for CPS design.
On the Performance of Packet Aggregation in IEEE 802.11ac MU-MIMO WLANs
Boris Bellalta,Jaume Barcelo,Dirk Staehle,Alexey Vinel,Miquel Oliver
Computer Science , 2012,
Abstract: Multi-user spatial multiplexing combined with packet aggregation can significantly increase the performance of Wireless Local Area Networks (WLANs). In this letter, we present and evaluate a simple technique to perform packet aggregation in IEEE 802.11ac MU-MIMO (Multi-user Multiple Input Multiple Output) WLANs. Results show that in non-saturation conditions both the number of active stations (STAs) and the queue size have a significant impact on the system performance. If the number of stations is excessively high, the heterogeneity of destinations in the packets contained in the queue makes it difficult to take full advantage of packet aggregation. This effect can be alleviated by increasing the queue size, which increases the chances to schedule a large number of packets at each transmission, hence improving the system throughput at the cost of a higher delay.
Performance Analysis of CSMA/CA Protocols with Multi-packet Transmission
Boris Bellalta,Azadeh Faridi,Dirk Staehle,Jaume Barcelo,Alexey Vinel,Miquel Oliver
Computer Science , 2012,
Abstract: Wireless objects equipped with multiple antennas are able to simultaneously transmit multiple packets by exploiting the channel's spatial dimensions. In this paper, we study the benefits of such Multiple Packet Transmission (MPT) approach, when it is used in combination with a Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocol for fully interconnected networks, addressing the interactions between the two mechanisms and showing the performance gains that can be achieved. To this end, a very simple Media Access Control (MAC) protocol that captures the fundamental properties and tradeoffs of a CSMA/CA channel access protocol supporting MPT is introduced. Using this protocol as a reference, a new analytical model is presented for the case of non-saturated traffic sources with finite buffer space. Simulation results show that the analytical model is able to accurately characterize the steady-state behaviour of the reference protocol for different number of antennas and different traffic loads, providing a useful tool for understanding the performance gains achieved by MAC protocols supporting MPT.
Women’s Memories in a Depressed Steel Valley: an Attempt to Deconstruct the Imaginings of Steel-working Lorraine
Virginie Vinel
Outlines : Critical Practice Studies , 2010,
Abstract: This paper is based on a research conducted between 2004 and 2006 and dealing with the memories of women in a steel valley struck by depression since the seventies, in the North-Eastern part of France. The imagery of steel-producing Lorraine coalesced in a rather standardized way around the figure of the steelworker working at the blast furnace. This research and the exhibition which followed from it, highlighted the activities of women, in the working place as well as in the domestic realm and in community or political movements. It thus contributes to a more complex imagining and less androcentric perspective on the ironworks past of the Lorraine region.
Cooperation among Wirelessly Connected Static and Mobile Sensor Nodes for Surveillance Applications
Edison Pignaton de Freitas,Tales Heimfarth,Alexey Vinel,Flávio Rech Wagner,Carlos Eduardo Pereira,Tony Larsson
Sensors , 2013, DOI: 10.3390/s131012903
Abstract: This paper presents a bio-inspired networking strategy to support the cooperation between static sensors on the ground and mobile sensors in the air to perform surveillance missions in large areas. The goal of the proposal is to provide low overhead in the communication among sensor nodes, while allocating the mobile sensors to perform sensing activities requested by the static ones. Simulations have shown that the strategy is efficient in maintaining low overhead and achieving the desired coordination.
Reconstructing The Wagner Act
Jean-Christian Vinel
Transatlantica : Revue d'études Américaines , 2006,
Abstract: This paper discusses the analysis presented in the first two chapters of State of the Union : Reconstructing the 1930s, and Citizenship at work .
Introducing the Issues.
Jean-Christian Vinel
Transatlantica : Revue d'études Américaines , 2006,
Abstract: It is no exaggeration to say that the twentieth century has been both a blessing and a bane for US labor unions. While it witnessed an era of social upheavals that, unlike previous ones, generated an important and unprecedented legislative effort (and, notably, a collective bargaining law that matched those adopted in countries such as France), the twentieth century also saw US unions decline to a parlous state. The Wagner Act notwithstanding, the proportion of unionized workers in the privat...
Prognostic properties of low-frequency seismic noise  [PDF]
Alexey Lyubushin
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.428087
Abstract: The prognostic properties of four low-frequency seismic noise statistics are discussed: multi- fractal singularity spectrum support width, wavelet-based smoothness index of seismic noise waveforms, minimum normalized entropy of squared orthogonal wavelet coefficients and index of linear predictability. The proposed methods are illustrated by data analysis from broad-band seismic network F-net in Japan for more than 15 years of observation: since the beginning of 1997 up to 15 of May 2012. The previous analysis of multi-fractal properties of low-frequency seismic noise allowed a hypothesis about approaching Japan Islands to a future seismic catastrophe to be formulated at the middle of 2008. The base for such a hypothesis was statistically significant decreasing of multi-fractal singularity spectrum support width mean value. The peculiarities of correlation coefficient estimate within 1 year time window between median values of singularity spectra support width and generalized Hurst exponent allowed to make a decision that starting from July of 2010 Japan come to the state of waiting strong earthquake. This prediction of Tohoku mega-earthquake, initially with estimate of lower magnitude as 8.3 only (at the middle of 2008) and further on with estimate of the time beginning of waiting earthquake (from the middle of 2010) was published in advance in a number of scientific articles and abstracts on international conferences. It is shown that other 3 statistics (except singularity spectrum support width) could extract seismically danger domains as well. The analysis of seismic noise data after Tohoku mega-earthquake indicates increasing of probability of the 2nd strong earthquake within the region where the north part of Philippine sea plate is approaching island Honshu (Nankai Trough).
How soon would the next mega-earthquake occur in Japan?  [PDF]
Alexey Lyubushin
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.58A1001
Abstract:

The problem of seismic danger estimate in Japan after Tohoku mega-earthquake 11 March of 2011 is considered. The estimates are based on processing low-frequency seismic noise wave-forms from broadband network F-net. A new method of dynamic estimate of seismic danger is used for this problem. The method is based on calculating multi-fractal properties and minimum entropy of squared orthogonal wavelet coefficients for seismic noise. The analysis of the data using notion of “spots of seismic danger” shows that the seismic danger in Japan remains at high level after 2011. 03. 11 within north-east part of Philippine plate—at the region of Nankai Though which traditionally is regarded as the place of strongest earthquakes. It is well known that estimate of time moment of future shock is the most difficult problem in earthquake prediction. In this paper we try to find some peculiarities of the seismic noise data which could extract future danger time interval by analogy with the behavior before Tohoku earthquake. Two possible precursors of this type were found. They are the results of estimates within 1-year moving time window: based on correlation between 2 mean multi-fractal parameters of the noise and based on cluster analysis of annual clouds of 4 mean noise parameters. Both peculiarities of the noise data extract time interval 2013-2014 as the danger.

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