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- An Adaptive Link Layer for Range Diversity in Multi-Radio Mobile Sensor Networks
- An important challenge in mobile sensor networks is to enable energy-efficient communication over a diversity of distances while being robust to wireless effects caused by node mobility. This paper argues that the pairing of two complementary radios with heterogeneous range characteristics enables greater range diversity at lower energy cost than...
- Tags: Mobile, Network, University Of Massachusetts, Sensor, Diversity, Advertising & Promotion, Wireless And Mobility, Marketing
- White papers 2009-03-05
- Block-Switched Networks: A New Paradigm for Wireless Transport
- TCP has well-known problems over multi-hop wireless networks as it conflates congestion and loss, performs poorly over time-varying and lossy links, and is fragile in the presence of route changes and disconnections. In this paper contribution is a clean-slate design and implementation of a wireless transport protocol, Hop, that uses...
- Tags: University Of Massachusetts, Wi-Fi, Tcp/Ip, Wireless, Networking
- White papers 2008-05-28
- University of Massachusetts enters online degree deal with China
- University of Massachusetts enters online degree deal with ChinaWhat are you thinking UMass?What is happening? China murders its citizens so we engage as if nothing is happening? Please, I beg my University that I love, stop and THINK! What are you doing? In your rush to...
- Tags: University of Massachusetts, UMass
- Discussion threads 2008-04-03
- University of Massachusetts enters online degree deal with China
- The University of Massachusetts announced today that it would be the first foreign university to offer courses and degrees via the Internet in China. Plans call for UMassOnline to offer credit and non-credit courses, certificate programs, and degree programs from all five UMass campuses -- through online...
- Tags: China, University Of Massachusetts, Internet, Groupware, Enterprise Software, Software, Christopher Dawson
- Blog posts 2008-03-31
- Memory Buddies: Exploiting Page Sharing for Server Consolidation in Virtualized Data Centers
- Modern data centers increasingly employ virtualization in order to maximize resource utilization while reducing costs. With the advent of multi-core processors, memory has become the key limiting resource when running multiple virtual machines on a given server. This paper argues for exploiting page sharing to significantly reduce aggregate memory requirements...
- Tags: Data Center, University Of Massachusetts, Data Centers, Storage, Server Consolidation, Servers, Hardware, Data Management
- White papers 2008-01-28
- A Three-Stage Load-Balancing Switch
- This paper presents a three-stage load-balancing switch without the mis-sequencing problem. Analytical results indicate that this 3SLB switch is able to guarantee 100% throughput as an ideal OQ switch plus a bounded delay. Moreover, the switch architecture naturally minimizes the blocking problem without any scheduling computation. There is no speedup...
- Tags: University Of Massachusetts, Fabric, Network Technology, Networking
- White papers 2008-01-15
- Understanding the Interaction Between Overlay Routing and Traffic Engineering
- This paper studies the interaction between overlay routing and MultiProtocol Label Switching MPLS Traffic Engineering TE in a single Autonomous System AS. This interaction is formulated as a two-player non-cooperative non-zero sum game, where the overlay tries to minimize the delay of overlay traffic and TE's objective is to minimize...
- Tags: Overlay, MPLS, University Of Massachusetts, Games, Networking, Personal Technology
- White papers 2008-01-01
- Prediction Based Routing for Vehicular Ad Hoc Networks
- Development in short range wireless LAN WLAN and long range wireless WAN WWAN technologies have motivated recent efforts to integrate the two. This creates new application scenarios that were not possible before. Vehicles with only WLAN radios can use other vehicles that have both WLAN and WWAN radios as mobile...
- Tags: Mobile, University Of Massachusetts, WLAN, Wireless LANs, LANs, Wi-Fi, Wireless, Advertising & Promotion, Networking, Marketing
- White papers 2008-01-01
- Proxy-Based Distribution of Streaming Video Over Unicast/Multicast Connections
- This paper addresses the problem of efficiently streaming a set of heterogeneous videos from a remote server through a proxy to multiple asynchronous clients so that they can experience playback with low startup delays. They developed a technique to analytically determine the optimal proxy prefix cache allocation to the videos...
- Tags: University Of Massachusetts, Streaming Video, Video, Allocation, Corporate Communications, Marketing
- White papers 2008-01-01
- A Multipath Background Network Architecture
- Background transfers, or transfers that humans do not actively wait on, dominate the Internet today. In today's best-effort Internet, background transfers can interfere with foreground transfers causing long wait times, thereby hurting human productivity. This paper presents the design and implementation of a background network, Harp, that addresses this problem....
- Tags: Network, University Of Massachusetts, Network Architecture, Internet, Networking
- White papers 2008-01-01
- A Peer-to-Peer On-Demand Streaming Service and Its Performance Evaluation
- Providing on-demand video streaming service over the Internet is a challenging task. This paper proposes DirectStream, a directory based peer-to-peer video streaming service that efficiently and cost-effectively provides video on-demand service with VCR operation support. The paper analytically and experimentally examines the system performance, and show that the proposed scheme...
- Tags: VoD, Performance, P2P, University Of Massachusetts, Streaming Video, Performance Evaluation, Web Site Development, Video On Demand (VoD), Web Technology, Digital Video, Peer To Peer (P2P), Internet, Personal Technology, Home Entertainment
- White papers 2008-01-01
- Application-Layer Multipath Data Transfer Via TCP: Schemes and Performance Tradeoffs
- For applications involving data transmission from multiple sources, an important problem is: when sources are allowed to use multiple paths, how does one select paths and control the sending rates on the paths to maximize the aggregate sending rate of the sources? This problem is considered in the context of...
- Tags: Performance, University Of Massachusetts, TCP, Source, Tcp/Ip, Networking
- White papers 2007-07-13
- A Self-Tuning Structure for Adaptation in TCP/AQM Networks
- Since Active Queue Management AQM Schemes are essentially feedback controllers, their impact on closed-loop behavior is directly related to the TCP congestion dynamic which, in turn, is strongly affected by network parameters such as link capacities and TCP loads. These parameters are non-stationary and in the absence of real-time estimates,...
- Tags: Parameter, Network, University Of Massachusetts, TCP, Tcp/Ip, Networking
- White papers 2007-01-01
- Providing Throughput Differentiation for TCP Flows Using Adaptive Two-Color Marking and Two-Level AQM
- This paper proposes a new paradigm for a Differential Service DiffServ network consisting of two-color marking at the edges of the network using token buckets coupled with differential treatment in the core. Using fluid-flow modelling, the authors present existence conditions for token-bucket rates and differential marking probabilities at the core...
- Tags: University Of Massachusetts, TCP, Core, Tcp/Ip, Networking, Performance Management, Human Resources, Workforce Management
- White papers 2007-01-01
- On the Autocorrelation Structure of TCP Traffic
- The statistical characteristics of network traffic - in particular the observation that it can exhibit long range dependence - have received considerable attention from the research community over the past few years. In addition, the recent claims that the TCP protocol can generate traffic with long rage dependent behavior has...
- Tags: University Of Massachusetts, TCP, Tcp/Ip, Networking
- White papers 2007-01-01
- Modeling Non-Functional Aspects in Service Oriented Architecture
- Service Oriented Architecture SOA is an architectural style to reuse and integrate subsystems in existing systems for designing new applications. Each application is designed in an implementation independent manner using abstract concepts: network services and connections between network services. In SOA, the non-functional aspects of services and connections should be...
- Tags: Aspect, University Of Massachusetts, SOA, Modeling, Service-Oriented Architecture (SOA), UML, Web Services, Middleware, Enterprise Software, Software, Ooa/Ood/Oop, Software Development, Software/Web Development
- White papers 2006-06-19
- Proposal: Amherst Community Wireless Project
- The Amherst Community Wireless project is a cooperative effort between UMass Amherst and the Town of Amherst. The goal of the project is to deploy a municipal wireless network covering the Town's 17 square miles of roads and facilities with wireless devices. This communication network will provide several major benefits...
- Tags: University Of Massachusetts, Wi-Fi, Wireless
- White papers 2006-03-09
- Dx/Rx: Valvular Heart Disease (Mobile)
- Dx/Rx: Valvular Heart Diseasepowered by Skyscape Authors: Dx/Rx: Valvular Heart DiseaseDennis A. Tighe, MD, University of Massachusetts Medical School, Theo E. Meyer, MD, University of Massachusetts Medical School, Gerard P. Aurigemma, MD, FACC, University of Massachusetts Medical SchoolPublisher: Jones and Bartlett Publishers Tightly organized into a super-condensed format, this handy...
- Tags: Mobile, University Of Massachusetts, Skyscape Inc., Advertising & Promotion, Marketing
- Software downloads 2005-04-11
- The Complex Envelope of a Bandlimited OFDM Signal Converges Weakly to a Gaussian Random Process
- Orthogonal Frequency Division Multiplexing OFDM systems have been used extensively in wireless communications applications in recent years; thus, there is significant interest in analyzing the properties of the transmitted signal in such systems. In particular, a large amount of recent work has focused on analyzing the variation of the complex...
- Tags: University Of Massachusetts, OFDM, Wireless
- White papers
- Handling Client Mobility and Intermittent Connectivity in Mobile Web Accesses
- Wireless devices are being increasingly used to access data on the web. Since intermittent connectivity and client mobility are inherent in such environments, this paper examines the impact of these factors on coherent dissemination of dynamic web data to wireless devices. The paper introduces the notion of eventual-delta consistency, and...
- Tags: Web, Dissemination, Mobile, University Of Massachusetts, Mobility, Client Mobility, Channel Management, Wi-Fi, Wireless, Marketing
- White papers
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