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Association for Computing Machinery
(6222 results)-
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Heapviz: Interactive Heap Visualization for Program Understanding and Debugging
August 3, 2010, 12:00am PDT
Understanding the data structures in a program is crucial to understanding how the program works, or why it doesn't work. Inspecting the code that implements the data structures, however, is an...
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BPGen: An Automated Breakpoint Generator for Debugging
May 8, 2010, 12:00am PDT
During debugging processes, breakpoints are frequently used to inspect and understand runtime behaviors of programs. Although most development environments offer convenient breakpoint facilities,...
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A Visual Interactive Debugger Based on Symbolic Execution
July 6, 2010, 12:00am PDT
The paper presents the concepts, usage, and prototypic implementation of a new kind of visual debugging tool based on symbolic execution of Java source code called visual symbolic state debugger....
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Debugging in the (Very) Large: Ten Years of Implementation and Experience
October 14, 2009, 12:00am PDT
Windows Error Reporting (WER) is a distributed system that automates the processing of error reports coming from an installed base of a billion machines. WER has collected billions of error...
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Respec: Efficient Online Multiprocessor Replay Via Speculation and External Determinism
March 17, 2010, 12:00am PDT
Deterministic replay systems record and reproduce the execution of a hardware or software system. While it is well known how to replay uniprocessor systems, replaying shared memory multiprocessor...
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Static Analysis to Model & Measure OO Paradigms
March 26, 2010, 12:00am PDT
Object oriented development has proved its worth in today's system because its design and development is better, reliable and easier to access than the traditional methodologies. Due to updated...
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Detailed Diagnosis of Performance Anomalies in Sensornets
June 29, 2010, 12:00am PDT
This paper addresses the problem of analysing performance anomalies in sensor networks. This paper proposes an approach that uses the local flash storage of the motes for logging system data, in...
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Toward a Verified Relational Database Management System
January 23, 2009, 12:00am PST
This paper reports on the experience implementing a lightweight, fully verified relational database management system (RDBMS). The functional specification of RDBMS behavior, RDBMS implementation,...
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Interactive Data Integration through Smart Copy & Paste
December 12, 2008, 12:00am PST
In many scenarios, such as emergency response or ad hoc collaboration, it is critical to reduce the overhead in integrating data. Here, the goal is often to rapidly integrate "enough" data to...
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Bootstrapping Pay-As-You-Go Data Integration Systems
June 12, 2008, 12:00am PDT
Data integration systems offer a uniform interface to a set of data sources. Despite recent progress, setting up and maintaining a data integration application still requires significant upfront...
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SciPort: An Adaptable Scientific Data Integration Platform for Collaborative Scientific Research
September 28, 2007, 12:00am PDT
Scientific data are posing new challenges to data management due to the large volume, complexity and heterogeneity of the data. Meanwhile, scientific collaboration becomes increasingly important,...
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capDL: A Language for Describing Capability-Based Systems
August 30, 2010, 12:00am PDT
Capabilities provide an access control model that can be used to construct systems where safety of protection can be precisely determined. However, in order to be certain of the security provided...
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Dynamic and Graphical Web Page Breakpoints
April 30, 2010, 12:00am PDT
Breakpoints are perhaps the quintessential feature of a de-bugger: they allow a developer to stop time and study the program state. Breakpoints are typically specified by selecting a line of...
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Opportunities for Concurrent Dynamic Analysis With Explicit Inter-Core Communication
June 6, 2010, 12:00am PDT
Multicore is now the dominant processor trend, and the number of cores is rapidly increasing. The paradigm shift to multicore forces the redesign of the software stack, which includes dynamic...
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What Would Other Programmers Do?: Suggesting Solutions to Error Messages
April 15, 2010, 12:00am PDT
Interpreting compiler errors and exception messages is challenging for novice programmers. Presenting examples of how other programmers have corrected similar errors may help novices understand...
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Digging Into UML Models to Remove Performance Antipatterns
May 3, 2010, 12:00am PDT
Performance antipatterns have been informally defined and characterized as bad practices in software design that can originate performance problems. Such special type of patterns can involve...
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Tool Support for Code Generation From a UMLsec Property
July 7, 2010, 12:00am PDT
Security requirements can be made explicit on the design level, such as annotations on a UML model. UMLsec extends UML to allow one to express security properties on a model, but it is still the...
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Improving the Requirements Process by Visualizing End-User Documents as Tag Clouds
April 15, 2010, 12:00am PDT
The process of requirements gathering has been a much-discussed subject in computer science for years. It seems difficult to incorporate end-users in this process. Although there have been...
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Model Driven Development of Secure XML Data Warehouses: A Case Study
March 26, 2010, 12:00am PDT
Data Warehouses (DWs) are currently considered to be the cornerstone of Business Intelligence (BI) systems. Security is a key issue in DWs since the business information that they manage is...
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The Benefits of the Interaction Between Data Warehouses and Question Answering
March 26, 2010, 12:00am PDT
Business Intelligence (BI) applications allow their users to query, understand, and analyze existing data within their organizations in order to acquire useful knowledge, thus making better...
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OneBusAway: Results From Providing Real-Time Arrival Information for Public Transit
April 15, 2010, 12:00am PDT
Public transit systems play an important role in combating traffic congestion, reducing carbon emissions, and promoting compact, sustainable urban communities. The usability of public transit can...
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Test-First Java Concurrency for the Classroom
March 13, 2010, 12:00am PST
Concurrent programming is becoming more important due to the growing dominance of multi-core processors and the prevalence of Graphical User Interfaces (GUIs). To prepare students for the...
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Shore-MT: A Scalable Storage Manager for the Multicore Era
March 26, 2009, 12:00am PDT
Database storage managers have long been able to efficiently handle multiple concurrent requests. Until recently, however, a computer contained only a few single-core CPUs, and therefore only a...
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Active GSM Cell-ID Tracking: "Where Did You Disappear?"
July 8, 2009, 12:00am PDT
Location-based services are mobile network applications of growing importance and variability. The space of location technologies and applications has not yet been fully explored, perhaps omitting...
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GUI Testing Using Computer Vision
April 15, 2010, 12:00am PDT
Testing a GUI's visual behavior typically requires human testers to interact with the GUI and to observe whether the expected results of interaction are presented. This paper presents a new...
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Flexible Resource Allocation and Composition Across GSM/3G Networks and WLANs
January 8, 2008, 12:00am PST
In this paper, the authors present system architecture to enable seamless composition of wireless network access across a range of technologies. Importantly, the authors do not require...
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Stragglers of the Herd Get Eaten: Security Concerns for GSM Mobile Banking Applications
June 1, 2010, 12:00am PDT
The first GSM standard was published in 1989, fully two decades ago. Since then, cryptanalysis has weakened or broken significant parts of the original specification. Yet many of these compromised...
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Helios: A Hybrid Electrical/Optical Switch Architecture for Modular Data Centers
September 3, 2010, 12:00am PDT
The basic building block of ever larger data centers has shifted from a rack to a modular container with hundreds or even thousands of servers. Delivering scalable bandwidth among such containers...
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How Green is IP-Telephony?
August 30, 2010, 12:00am PDT
With constantly increasing costs of energy, authors ask themselves what they can say about the energy efficiency of existing VoIP systems. To answer that question, authors gather information about...
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Preserving Privacy and Fairness in Peer-to-Peer Data Integration
June 10, 2010, 12:00am PDT
Peer-to-peer data integration - a.k.a. Peer Data Management Systems (PDMSs) - promises to extend the classical data integration approach to the Internet scale. Unfortunately, some challenges...
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White Papers
Phastlane: A Rapid Transit Optical Routing Network
June 24, 2009, 12:00am PDT
This paper presents Phastlane, a hybrid electrical/optical routing network for future large scale, cache coherent multi core microprocessors. The heart of the Phastlane network is a low latency...
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HAIR: Hierarchical Architecture for Internet Routing
December 1, 2009, 12:00am PST
In the light of recent interest in re-designing the Internet, authors introduce HAIR, a routing architecture that tackles the problem of routing table growth, restricts the visibility of routing...
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Whitepapers
Channel Assignment Algorithms: A Comparison of Graph Based Heuristics
May 4, 2009, 12:00am PDT
This paper gives the comparison of different channel assignment heuristics proposed in the literature and introduces a new algorithm named MCAIR. Specifically, it compares, static, multi-radio...
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White Papers
Towards Energy Efficient VoIP Over Wireless LANs
May 30, 2008, 12:00am PDT
Wireless LAN (WLAN) radios conserve energy by staying in sleep mode. With real-time applications like VoIP, it is not clear how much energy can be saved by this approach since packets delayed...
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A Realisitic VoIP Traffic Generation and Evaluation Tool for OMNeT++
March 3, 2008, 12:00am PST
The fraction of voice over Internet Protocol (VoIP) based telephone calls among the totality of voice based communication acts has been significantly growing during the last years. In wired, as...
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Pr2-P2PSIP: Privacy Preserving P2P Signaling for VoIP and IM
August 1, 2010, 12:00am PDT
In the last few years, there has been a good deal of effort put into the research and standardization of P2P-based VoIP signaling, commonly called P2PSIP. However, there has been one important...
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DCell: A Scalable and Fault-Tolerant Network Structure for Data Centers
August 22, 2008, 12:00am PDT
A fundamental challenge in data center networking is how to efficiently interconnect an exponentially increasing number of servers. This paper presents DCell, a novel network structure that has...
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Scalable Network Virtualization Using FPGAs
February 23, 2010, 12:00am PST
Recent virtual network implementations have shown the capability to implement multiple network data planes using a shared hardware substrate. In this project, a new scalable virtual networking...
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Scalable Network Distance Browsing in Spatial Databases
June 12, 2008, 12:00am PDT
An algorithm is presented for finding the k nearest neighbors in a spatial network in a best-first manner using network distance. The algorithm is based on precomputing the shortest paths between...
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Sharing Conversation and Sharing Life: Video Conferencing in the Home
April 15, 2010, 12:00am PDT
Video conferencing is a technology that families and friends use to connect with each other over distance. However, even with such technology readily available, one still does not have a good...
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Whitepapers
Distributed Rating Prediction in User Generated Content Streams
October 27, 2011, 12:00am PDT
Recommender systems predict user preferences based on a range of available information. For systems in which users generate streams of content (e.g., blogs or periodically-updated newsfeeds),...
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On the Stability and Optimality of Universal Swarms
July 11, 2011, 12:00am PDT
Recent work on BitTorrent swarms has demonstrated that a bandwidth bottleneck at the seed can lead to the underutilization of the aggregate swarm capacity. Bandwidth underutilization also occurs...
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CARE: Content Aware Redundancy Elimination for Challenged Networks
October 30, 2012, 12:00am PDT
This paper presents the design of a novel architecture called CARE (Content-Aware Redundancy Elimination) that enables maximizing the informational value that challenged networks offer their...
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Whitepapers
Orchestrating Massively Distributed CDNs
December 13, 2012, 12:00am PST
The authors consider content delivery architecture based on geographically dispersed groups of "Last-mile" CDN servers, e.g., set-top boxes located within users' homes. These servers may belong to...
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McMAC: A Power Efficient, Short Preamble Multi-Channel Medium Access Control Protocol for Wireless Sensor Networks
March 23, 2012, 12:00am PDT
In this paper, the authors present McMAC, a lightweight, low power and multi-channel MAC protocol for duty cycled Wireless Sensor Networks (WSNs) based on the strobed preamble sampling technique...
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An Amulet for Trustworthy Wearable mHealth
February 29, 2012, 12:00am PST
Mobile technology has significant potential to help revolutionize personal wellness and the delivery of healthcare. Mobile phones, wearable sensors, and home-based tele-medicine devices can help...
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Interference Scripting: Protocol-Aware Interference Generation for Repeatable Wireless Testbed Experiments
August 26, 2012, 12:00am PDT
Despite its practical importance, interference can still be considered a "Black box" in wireless network experiments as it is difficult to generate in a controlled and repeatable manner. Current...
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Anatomy of a Large European IXP
August 17, 2012, 12:00am PDT
The largest IXPs carry on a daily basis traffic volumes in the petabyte range, similar to what some of the largest global ISPs reportedly handle. This little-known fact is due to a few hundreds of...
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Cellular Data Meet Vehicular Traffic Theory: Location Area Updates and Cell Transitions for Travel Time Estimation
September 8, 2012, 12:00am PDT
Road traffic can be monitored by means of static sensors and derived from floating car data, i.e., reports from a sub-set of vehicles. These approaches suffer from a number of technical and...
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Outsourcing the Routing Control Logic: Better Internet Routing Based on SDN Principles
October 30, 2012, 12:00am PDT
Inter-domain routing is based on a fully decentralized model, where multiple Autonomous Systems (AS) interact via the BGP protocol. Although BGP is the "Glue" of the Internet, it faces a lot of...
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On Flow Concurrency in the Internet and Its Implications for Capacity Sharing
December 10, 2012, 12:00am PST
Flow concurrency is the measure of the number of active flows at a given point in time at a given point in the network, and can be used as a complement to traffic volume to understand the dynamics...
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Optimal Deployment of Charging Stations for Electric Vehicular Networks
December 10, 2012, 12:00am PST
In a smart city environment, the authors look at a new, upcoming generation of vehicles running on electric power supplied by on-board batteries. Best recharging options include charging at home,...
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AFR: Automatic Multi-Stage Forensic Data Retrieval
December 10, 2012, 12:00am PST
The investigation of malware infections in enterprise networks is today a tedious task with a lot of manual intervention in order to find the scattered relevant bits and bytes from infected hosts....
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On the Feasibility of Distributed Link-Based Channel Assignment in Wireless Mesh Networks
November 4, 2011, 12:00am PDT
In this paper, the authors present an experimental evaluation of the Distributed Greedy Algorithm (DGA) for distributed channel assignment in wireless mesh networks. The algorithm has the...
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Modeling and Simulation of Joint Time-Frequency Properties of Spectrum Usage in Cognitive Radio
October 29, 2011, 12:00am PDT
The development of the Dynamic Spectrum Access/Cognitive Radio (DSA/CR) technology can significantly benefit from the availability of realistic models able to accurately capture and reproduce the...
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Advanced and Versatile Real-Time Emulation Platform for Heterogeneous Radio Access Systems
October 31, 2008, 12:00am PDT
This paper is aimed at showing the capabilities of the real-time testbed for all-IP beyond 3G heterogeneous wireless networks that has been developed in the framework of the European IST AROMA...
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Real-Time Evaluation of Radio Access Technology Selection Policies in Heterogeneous Wireless Systems: The AROMA Testbed Approach
October 31, 2008, 12:00am PDT
This paper presents and describes the real-time testbed for all-IP Beyond 3G heterogeneous wireless networks that has been developed in the framework of the European IST AROMA project. The main...
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Real-Time HSPA Emulator for End-to-Edge QoS Evaluation in All-IP Beyond 3G Heterogeneous Wireless Networks
March 3, 2008, 12:00am PST
This paper is aimed at presenting the real-time High Speed Packet Access (HSPA) emulator that has been developed in the framework of the AROMA project. Real-time emulators allow reproducing...
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Tahoe - The Least-Authority Filesystem
October 31, 2008, 12:00am PDT
Tahoe is a storage grid designed to provide secure, long-term storage, such as for backup applications. It consists of userspace processes running on commodity PC hardware and communicating with...
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Proofs of Retrievability with Public Verifiability and Constant Communication Cost in Cloud
December 13, 2012, 12:00am PST
For data storage outsourcing services, it is important to allow data owners to efficiently and securely verify that the storage sever stores their data correctly. To address this issue, several...
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Comparing Apples and Oranges? Trends in IVC Simulations
June 25, 2012, 12:00am PDT
Looking back at recent years in Inter-Vehicle Communication (IVC) research, tremendous improvements in precision and realism of simulation models concerning all its aspects can be observed. These...
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BotFinder: Finding Bots in Network Traffic Without Deep Packet Inspection
December 13, 2012, 12:00am PST
Bots are the root cause of many security problems on the Internet, as they send spam, steal information from infected machines, and perform distributed denial-of-service attacks. Many approaches...
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Coexist: Integrating Content Oriented Publish/Subscribe Systems With IP
October 30, 2012, 12:00am PDT
Content-Centric Networking (CCN) seeks to meet the content-centric needs of users. In this paper, the authors propose hybrid-COPSS, a hybrid content-centric architecture. They build on the...
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Efficiently Identifying Working Sets in Block I/O Streams
June 1, 2011, 12:00am PDT
Identifying groups of blocks that tend to be read or written together in a given environment is the first step towards powerful techniques for device failure isolation and power management. For...
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Understanding Data Survivability in Archival Storage Systems
June 6, 2012, 12:00am PDT
Preserving data for a long period of time in the face of faults, large and small, is crucial for designing reliable archival storage systems. However, the survivability of data is different from...
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MusicScore: Mobile Music Composition for Practice and Fun
November 2, 2012, 12:00am PDT
In this paper, the authors present their design of MusicScore, a professional grade application on the iOS platform for music composition and live performance tracking, used by composers and...
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Cloud-based Social Application Deployment using Local Processing and Global Distribution
December 13, 2012, 12:00am PST
Social applications represent a paradigm shift on how the Internet is to be used, and have already changed the way users work, live, and play. When it comes to deploying social applications, cloud...
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Scalable Locking and Recovery for Network File Systems
November 16, 2007, 12:00am PST
Petascale computing systems pose serious scalability challenges for any data storage system. Lustre is a scalable, secure, robust, highly-available cluster file system that has been successfully...
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Data Layout Optimization for Petascale File Systems
November 15, 2009, 12:00am PST
High-Performance Computing (HPC) has crossed the Petaflop mark and is moving forward to reach the Exaflop range. However, while computing resources are making rapid progress, there is a...
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pNFS, POSIX, and MPI-IO: A Tale of Three Semantics
November 15, 2009, 12:00am PST
Advanced research collaborations push the bounds of modern technology, but continue to be constrained by rigid computing and storage infrastructures. Many large compute clusters are tightly...
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Scalable I/O Tracing and Analysis
November 15, 2009, 12:00am PST
As supercomputer performance approached and then surpassed the petaflop level, I/O performance has become a major performance bottleneck for many scientific applications. Several tools exist to...
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Uncovering Errors: The Cost of Detecting Silent Data Corruption
November 15, 2009, 12:00am PST
Data integrity is pivotal to the usefulness of any storage system. It ensures that the data stored is free from any modification throughout its existence on the storage medium. Hash functions such...
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Using the Active Storage Fabrics Model to Address Petascale Storage Challenges
November 15, 2009, 12:00am PST
The authors present the Active Storage Fabrics (ASF) model for storage embedded parallel processing as a way to address petascale data intensive challenges. ASF is aimed at emerging scalable...
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Extending Scalability of Collective IO Through Nessie and Staging
November 13, 2011, 12:00am PST
The increasing fidelity of scientific simulations as they scale towards exascale sizes is straining the proven IO techniques championed throughout terascale computing. Chief among the successful...
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In-Situ I/O Processing: A Case for Location Flexibility
November 13, 2011, 12:00am PST
Increasingly severe I/O bottlenecks on High-End Computing machines are prompting scientists to process output data during simulation time, "in-situ", and before placing data on disks. This paper...
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Power Use of Disk Subsystems in Supercomputers
November 13, 2011, 12:00am PST
Exascale will present many challenges to the HPC community, but the primary problem will likely be power consumption. Current petascale systems already use a significant fraction of the power that...
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Robust Benchmarking for Archival Storage Tiers
November 13, 2011, 12:00am PST
Until recently, archival storage tiers have consisted of tape-based devices with a large storage capacity, but limited I/O performance for data retrieval. However, the growing capacity and...
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Performance Prediction for Concurrent Database Workloads
June 16, 2011, 12:00am PDT
Current trends in data management systems, such as cloud and multi-tenant databases are leading to data processing environments that concurrently execute heterogeneous query workloads. At the same...
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C-MR: Continuously Executing MapReduce Workflows on Multi-Core Processors
June 18, 2012, 12:00am PDT
The widespread appeal of MapReduce is due, in part, to its simple programming model. Programmers provide only application logic while the MapReduce framework handles the logistics of data...
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Optimizing Index Deployment Order for Evolving OLAP
February 1, 2012, 12:00am PST
Many database applications deploy hundreds or thousands of indexes to speed up query execution. First, real-world businesses often require online index deployment, and the traditional off-line...
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