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ABSTRACT: The next generation of social networks-social life networks (SLNs)-could become a powerful force for individual well-being and economic growth. In particular, SNLs in emerging economies could provide timely access to essential resources such as healthcare, transportation, education, and water. The authors outline requirements for SLNs and the challenges of realizing these next-gen social networks.
IT Professional 11/2011;
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ABSTRACT: With the advances in technology and proliferation of cheap storage, high rate of digital multimedia interaction signifies the increasing need of computer users for a decent application to organize personal media in a meaningful way. In this paper, we want to organize personal media in terms of the sub-events they cover. A semantic gap exists between media, and people's perception of the events and memories associated with this media. A framework is needed to address such gap. This paper describes a novel model-based approach for partitioning and organizing personal photo archive in terms of high-level subevents that capture and represent human experience. Since photos are the most ubiquitous and prolific form of user generated content, we focus on the automatic annotation of personal photo collection in this paper. We introduce ROntology (Recognition-Ontology) that is a context-aware model with concrete contextual information for subevent recognition. Currently our approach utilizes the mereological, spatial and temporal properties of modeled-events in R-Ontology. Personal media will then populate R-Ontology. We tested this approach using our personal photo archive describing two different scenarios: Trip and Indianwedding.
Semantic Computing (ICSC), 2011 Fifth IEEE International Conference on; 10/2011
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ABSTRACT: Cooperation between rational users has emerged as a new networking paradigm to improve the performance of wireless networks. In this paper, transmitter cooperation between wireless nodes in a Gaussian multiple access channel is studied under the framework of coalitional game theory. The stability of the grand coalition, the coalition of all users, is studied by modeling the game in partition form, in contrast to previous approaches using characteristic form games, in scenarios with infinite and finite cooperation capacity between transmitters. In both cases, irrespective of the channel gains, the grand coalition is shown to be the sum rate optimal and stable, in the sense that users do not have any incentive to leave the coalition.
Information Theory Proceedings (ISIT), 2011 IEEE International Symposium on; 09/2011
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ABSTRACT: This paper examines the impact of hot carriers (HCs) on n-channel metal-oxide-semiconductor (MOS) field-effect transistor mismatch across the 45- and 65-nm complementary MOS technology generations. The reported statistical analysis is based on a large overall sample population of about 1000 transistors. HC stress introduces a source of variability in device electrical parameters due to the randomly generated charge traps in the gate dielectric or at the substrate/dielectric interface. The evolution of the threshold-voltage mismatch during an HC stress is well modeled by assuming a Poisson distribution of the induced charge traps with a nonuniform generation along the channel. Once the evolution of the HC-induced VT shift is known, a single parameter is able to accurately describe the evolution of the HC-induced VT variability. This parameter is independent of the stress time and stress bias voltage. The HC stress causes a significantly larger degradation in the subthreshold slope variability, compared to threshold voltage variability for both investigated technology nodes.
IEEE Transactions on Electron Devices 09/2011; · 2.32 Impact Factor
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ABSTRACT: The current Internet, which was designed over 40 years ago, is facing unprecedented challenges in many aspects, especially in the commercial context. The emerging demands for security, mobility, content distribution, etc. are hard to be met by incremental changes through ad-hoc patches. New clean-slate architecture designs based on new design principles are expected to address these challenges. In this survey article, we investigate the key research topics in the area of future Internet architecture. Many ongoing research projects from United States, the European Union, Japan, China, and other places are introduced and discussed. We aim to draw an overall picture of the current research progress on the future Internet architecture.
IEEE Communications Magazine 08/2011; · 3.79 Impact Factor
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ABSTRACT: The last 40 years of research has matured packet switching technology as a key communication primitive. Its key use context, the Internet, has been phenomenally successful. From its humble beginning as a research network, it has evolved into a critical infrastructure for the development of businesses, societies, and nations. The Internet??s most popular application, the World Wide Web, has powered the present information age that has accelerated progress in all areas. There is no doubt that a lot has been achieved. Yet as we look toward the future, a very different set of research challenges present themselves. These challenges originate primarily from the ??responsibilities?? of handling an elite infrastructure, the ??burden?? of satisfying popular expectations, and catering to the ??change?? in its use context.
IEEE Communications Magazine 08/2011; · 3.79 Impact Factor
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ABSTRACT: The support for mobility is a major requirement for the future Internet. Although several mobility solutions have been proposed, none of them has been largely deployed, mostly because they are not economically viable. We propose a business oriented mobility framework - Mobility Support Service (MSS) to be offered as a value-added service to paying mobile customers. MSS uses Identifiers (IDs) to locate the nodes and network addresses as points of attachment for the nodes. MSS is a scalable distributed service. MSS does not require changes in existing network architecture nor services. We present two MSS distributing algorithms that enable tradeoffs among costs and QoS. We show by simulations the advantages of MSS compared to existing mobility solutions, especially regarding scalability and service delay. However the main advantage of MSS is that it can be realistically offered, because it is economically viable.
Communications (ICC), 2011 IEEE International Conference on; 07/2011
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ABSTRACT: Ad hoc network is a network formed without any central administration which consists of nodes that use a wireless interface to send packet data. Since the nodes in a network of this kind can serve as routers and hosts, they can forward packets on behalf of other nodes and run user applications. A mobile ad hoc network (MANET) is probably the most well-known example of this networking paradigm having been around for over twenty years, mainly exploited to design tactical networks. Furthermore, the multi-hop ad hoc networking paradigm is often used for building sensor networks to study, control, and monitor events and phenomena. To exploit these potentialities, simulation modeling and theoretical analyses have to be complemented by real experiences (e.g., experiences/measurements on real prototypes), which provide both a direct evaluation of ad hoc networks and, at the same time, precious information for a realistic modeling of these systems. In this paper we will simulate the environment used for analyzing, evaluating and implementing AODV, DSR and DSDV routing protocols in MANET, to analyze the performance of above said protocols based on Packet Delivery Fraction, Average End-to-End Delay and Number of dropped data packets. We have compared these three protocols on the basis of two traffic sources and these are TCP and CBR. For our simulation we had used a discrete event simulator known as NS2 (i.e. Network Simulator Ver.2.27).
Communication Systems and Network Technologies (CSNT), 2011 International Conference on; 07/2011
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ABSTRACT: A novel ripple mitigation technique is proposed for switched-capacitor voltage regulators (SCVR), which eliminates the output voltage ripple without using multi-phase interleaving. An inner control loop matches the SCVR's switch current to the load current on a cycle by cycle basis. A 2-phase 3:2 SCVR is designed in 45-nm CMOS process with the proposed control. For a 1.8 V to 1.05 V /40 mA converter, the proposed mitigation loop reduces the peak-to-peak output ripple from 330 mV<sub>p-p</sub> to 17 mV<sub>p-p</sub>, using total output capacitance of 4 nF/A. In addition, the proposed technique yields excellent regulation transient response.
Circuits and Systems (ISCAS), 2011 IEEE International Symposium on; 06/2011
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ABSTRACT: Social network analysis is a set of theories, tools, and processes for better understanding the relationships and structure of a network. Clustering with constraints is an active area of Social network analysis. Adding constraints to clustering improves the performance of a variety of algorithms. Cluster analysis is concerned with the problem of partitioning a given set of entities into homogeneous and well-separated subsets called clusters. Cluster Analysis aims at finding subsets, called clusters, which are homogeneous and/or well separated. Minimum sum of diameters clustering for two clusters can be solved by reduction constraints into the 2-Conjunctive Normal Form statement. This paper presents a formulation to form cluster based on concept of bonding and bridging in social network.
Emerging Trends in Networks and Computer Communications (ETNCC), 2011 International Conference on; 05/2011
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ABSTRACT: New air-to-ground wireless datalinks are needed to supplement existing civil aviation technologies. The 960 - 1164 MHz part of the IEEE L band has been identified as a candidate spectrum. EUROCONTROL - the European organization for the Safety of Air Navigation, has funded two parallel projects and developed two proposals called L-DACS1 and L-DACS2. Although, there is a significant amount of literature available on each of the two technologies from the two teams that designed the respective proposals, there is very little independent comparison of the two proposals. The goal of this paper is to provide this comparison. We compare the two proposals in terms of their scalability, spectral efficiency, and interference resistance. Both the technologies have to co-exist with several other aeronautical technologies that use the same L-band.
Aerospace Conference, 2011 IEEE; 04/2011
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ABSTRACT: We study the online micro-blog sentiment detection problem, which aims to determine whether a micro-blog post expresses emotions. This problem is challenging because a micro-blog post is very short and individuals have distinct ways of expressing emotions. A single classification model trained on the entire corpus may fail to capture characteristics unique to each user. On the other hand, a personalized model for each user may be inaccurate due to the scarcity of training data, especially at the very beginning where users have just posted a few entries. To overcome these challenges, we propose learning a global model over all micro-bloggers, which is then leveraged to continuously refine the individual models through a collaborative online learning way. We evaluate our algorithm on a real-life micro-blog dataset collected from the popular micro-blog site - Twitter. Results show that our algorithm is effective and efficient for timely sentiment detection in real micro-blogging applications.
Data Mining (ICDM), 2010 IEEE 10th International Conference on; 01/2011
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ABSTRACT: In this paper, we propose a new dynamic resource allocation (DRA) scheme to support the constantly increasing online video stream traffic, especially high definition (HD) video streams. Our DRA scheme is based on online traffic prediction using seasonal time analysis. Our scheme seeks to provide accurate traffic prediction, to minimize the resource negotiation frequency, and to increase the utilization of the network resources while meeting maximum delay requirements. We validate our approach using various video traces, including our video collection of more than 50 HD video traces. We show through our results that our proposed scheme achieve up to 19.8% improvement in allocating bandwidth for short-length video traces, and up to 25% for long traces compared to the variable step-size adaptive (VSA) algorithm.
Internet Multimedia Services Architecture and Application(IMSAA), 2010 IEEE 4th International Conference on; 01/2011
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ABSTRACT: We propose a new constrained Markov decision process framework with risk-type constraints. The risk metric we use is Conditional Value-at-Risk (CVaR), which is gaining popularity in finance. It is a conditional expectation but the conditioning is defined in terms of the level of the tail probability. We propose an iterative offline algorithm to find the risk-contrained optimal control policy. A stochastic approximation-inspired `learning' variant is also sketched.
Decision and Control (CDC), 2010 49th IEEE Conference on; 01/2011
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ABSTRACT: We investigated the surface band-to-band tunnelling (BTBT) current under the off-state condition in drain-extended MOS (DeMOS) devices. We found significant gate-induced drain leakage current due to surface BTBT, which was also reported earlier as the dominant cause of early time-dependent dielectric breakdown and device failure. Furthermore, a layout solution for the existing DeMOS device is proposed in order to mitigate the surface BTBT current and the associated gate oxide reliability issues, without sacrificing the mixed-signal performance of the device.
IEEE Transactions on Electron Devices 01/2011; · 2.32 Impact Factor
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ABSTRACT: Most of the IEEE 802.16e Mobile WiMAX scheduling proposals for real-time traffic using unsolicited grant service (UGS) focus on the throughput and the guaranteed latency. The delay variation or delay jitter and the effect of burst overhead have not yet been investigated. This paper introduces a new technique called swapping min-max (SWIM) for UGS scheduling that not only meets the delay constraint with optimal throughput, but also minimizes the delay jitter and burst overhead.
IEEE Systems Journal 01/2011; · 0.92 Impact Factor
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ABSTRACT: Many challenges to the Internet including global routing scalability have drawn significant attention from both industry and academia, and have generated several new ideas for the next generation. MILSA (Mobility and Multihoming supporting Identifier Locator Split Architecture) and related enhancements are designed to address the naming, addressing, and routing scalability challenges, provide mobility and multihoming support, and easy transition from the current Internet. In this paper, we synthesize our research into a multiple-tier realm-based framework and present the fundamental principles behind the architecture. Through detailed presentation of these principles and different aspects of our architecture, the underlying design rationale is justified. We also discuss how our proposal can meet the IRTF RRG design goals. As an evolutionary architecture, MILSA balances the high-level long-run architecture design with ease of transition considerations. Additionally, detailed evaluation of the current inter-domain routing system and the achievable improvements deploying our architecture is presented that reveals the roots of the current difficulties and helps to shape our deployment strategy.
IEEE Journal on Selected Areas in Communications 11/2010; · 3.41 Impact Factor
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ABSTRACT: Relaying is often seen as one of the means of increasing capacity of wireless networks [?]. Thus, various cooperative communication schemes for relaying have been proposed that achieve close to the information-theoretic network capacity. The premise behind such schemes is cooperative behavior of users. This, however, cannot be taken for granted. Users may be selfish and care only about their own rates. They might even strategically deviate from their agreed role in such cooperative communication schemes leading to a possible degradation for all. In this paper, we look at the generalized Gaussian relay channel model with two selfish users. A capacity-achieving communication scheme for such channel models was proposed by Sendonaris, et al. [?]. We show that under certain channel conditions, operating on a part of the Pareto-optimal boundary of the achievable rate region with this scheme is a Nash equilibrium, and in fact these are the only Nash equilibria. We establish the results for the one-way Gaussian relay channel, and then extend it to the two-way Gaussian relay channel model. These results may be seen as being in the same spirit as the recent results of Berry and Tse for the Gaussian interference channel [?], [?].
Communication, Control, and Computing (Allerton), 2010 48th Annual Allerton Conference on; 11/2010
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ABSTRACT: Introduction of differentiated services on the Internet has failed primarily due to many economic impediments. We focus on the provider competition aspect, and develop a multi-class queueing network game framework to study it. Each network service provider is modeled as a single-server multi-class queue. Providers post prices for various service classes. Traffic is elastic and there are multiple types of it, each traffic-type is sensitive to a different degree to Quality of Service (QoS). Arriving users choose a provider and a class for service. We study the pricing and service competition between the providers in a game-theoretic setting. We provide sufficient conditions for the existence of Nash equilibrium in the Bertrand (pricing) game between the multi-class queueing service providers. We also characterize the inefficiency (price of anarchy) due to strategic DiffServ pricing.
Teletraffic Congress (ITC), 2010 22nd International; 10/2010
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ABSTRACT: High definition video streams are gaining larger shares of the Internet usage for typical users on daily basis. This is an expected result of the current boom in the online standard and high definition (HD) video streaming services such as YouTube and Hulu. Because of these video streams' unique statistical characteristics and their high bandwidth requirements, they are considered to be a continuous challenge in both network scheduling and resource allocation fields. In this paper we provide a statistical analysis of over 50 high definition video traces that resembles wide varieties of high definition video traffic workloads. We performed both factor and cluster analysis on our collection of video traces to support a better understanding of video stream workload characteristics and their impact on network traffic. Additionally, we compare and evaluate different modeling approaches for high definition videos traces.
Multimedia and Expo (ICME), 2010 IEEE International Conference on; 08/2010
