Coding techniques are progressively succeeding in finding a beneficial use throughout all the components of advanced multimedia streaming networks, including peer-to-peer (P2P) content distribution strategies. In fact...
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Coding techniques are progressively succeeding in finding a beneficial use throughout all the components of advanced multimedia streaming networks, including peer-to-peer (P2P) content distribution strategies. In fact, although P2P algorithms are regarded as an important technology that will be part of future commercial Internet protocol television (IPTV) platforms, it has been shown that their ability to efficiently distribute multimedia streams within strict time constraints, and their robustness to high churn rates, can still improve when putting to good use source and network coding algorithms. For this reason, in the past few years a wealth of research has been undertaken aiming at jointly optimizing both coding and streaming schemes. In this article, we analyze the progress made by the latest scientific research in the field of jointly using coding and P2P streaming strategies, and we offer a set of experimental results performed on a real planet-wide P2P streaming test-bed, using Digital Fountains (DFs). Surprisingly, our test-bed study reveals that utilizing DF techniques is not always beneficial to the distribution of streaming data using a P2P distribution strategy. In fact, our results show that only when the network scales beyond a certain size, it is possible to appreciate the advantages introduced by the use of DFs, showing that coding techniques should always be carefully deployed and their advantages well understood. For this reason, we believe this work can provide a useful aid in better appreciating the critical aspects of jointly utilizing multimedia streaming and DF coding techniques for IPTV.
The number of women in computing is significantly lower than the number of men, with African American women making up an even smaller segment of this population. A recent study reveals that African-American middle sch...
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The number of women in computing is significantly lower than the number of men, with African American women making up an even smaller segment of this population. A recent study reveals that African-American middle school girls generally have negative attitudes toward computer science, but that those feelings can change through intervention.
作者：
JUBIN, JTORNOW, JDROCKWELL INT
COLLINS DEF COMMUN ORGDARPA PACKET RADIO PROGRAMRICHARDSONTX 75081 SRI INT
DARPA SURVIVABLE RADIO NETWORKS PROGRAMMENLO PKCA 94025
In this paper we describe the current state of the DARPA packet radio network. Fully automated algorithms and protocols to organize, control, maintain, and move traffic through the packet radio network have been desig...
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In this paper we describe the current state of the DARPA packet radio network. Fully automated algorithms and protocols to organize, control, maintain, and move traffic through the packet radio network have been designed, implemented, and tested. By means of protocols, networks of about 50 packet radios with some degree of nodal mobility can be organized and maintained under a fully distributed mode of control. We have described the algorithms and illustrated how the PRNET provides highly reliable network transport and datagram service, by dynamically determining optimal routes, effectively controlling congestion, and fairly allocating the channel in the face of changing link conditions, mobility, and varying traffic loads.
Time-triggered communication protocols, such as time-triggered protocol (TTP) and FlexRay, have the potential to solve many system integration and concurrent engineering issues in the aerospace industry. This paper in...
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Time-triggered communication protocols, such as time-triggered protocol (TTP) and FlexRay, have the potential to solve many system integration and concurrent engineering issues in the aerospace industry. This paper investigates the scheduling of periodic applications on time-triggered systems. A novel scheduling problem is formulated to capture a unique feature commonly existing in the safety-critical time-triggered systems, i.e., in task graphs running in such systems, some nodes (i.e., tasks and messages) are strictly periodic while others are not. To address the problem, a novel scheduling algorithm called synchronized highest level first (SHLF) algorithm is presented. Moreover, to further improve schedulability, this paper also proposes two rescheduling and backtracking approaches, namely release time deferment (RTD) procedure and backtracking and priority promotion (BPP) procedure. Performance evaluation results are presented to demonstrate the effectiveness and competitiveness of our approaches when compared with existing algorithms.
This article presents a survey of state-of-the-art hardware designs optimizing the tradeoffs between security, power, and costs in ultra-low-power systems like the Internet of Things. The authors analyze the connectio...
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This article presents a survey of state-of-the-art hardware designs optimizing the tradeoffs between security, power, and costs in ultra-low-power systems like the Internet of Things. The authors analyze the connections between hardware specs and system demands to bridge the gap between research conducted in different communities. They also identify open problems in designing future ultra-low-power and secure hardware.
Extension of Nahman and Holt's method to include arbitrary resistive terminations is considered. For this purpose, new efficient algorithms have been derived.
Extension of Nahman and Holt's method to include arbitrary resistive terminations is considered. For this purpose, new efficient algorithms have been derived.
Microscopes can now cover large spatial areas and capture stem cell behavior over time. However, without discovering statistically reliable quantitative stem cell quality measures, products cannot be released to marke...
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Microscopes can now cover large spatial areas and capture stem cell behavior over time. However, without discovering statistically reliable quantitative stem cell quality measures, products cannot be released to market. A Web-based measurement system overcomes desktop limitations by leveraging cloud and cluster computing for offline computations and by using Deep Zoom extensions for interactive viewing and measurement.
Results are presented that quantify how velocity and attitude estimates can benefit from an improvement to the traditional quadrotor dynamic model. The improved model allows accelerometer measurements, which are routi...
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Results are presented that quantify how velocity and attitude estimates can benefit from an improvement to the traditional quadrotor dynamic model. The improved model allows accelerometer measurements, which are routinely available at high rates, to reduce an estimator's dependence on complex exteroceptive measurements, such as those obtained by an onboard camera or laser range finder.
A novel Fourier technique for digital signal processing is developed. This approach to Fourier analysis is based on the number-theoretic method of the Mobius inversion of series. The Fourier transform method developed...
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A novel Fourier technique for digital signal processing is developed. This approach to Fourier analysis is based on the number-theoretic method of the Mobius inversion of series. The Fourier transform method developed is shown also to yield the convolution of two signals. A computer simulation shows that this method for finding Fourier coefficients is quite suitable for digital signal processing. It competes with the classical FFT (fast Fourier transform) approach in terms of accuracy, complexity, and speed.< >
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