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From Communications of the ACM

Technical Perspective: Video Quality Assessment in the Age of Internet Video

With video delivery, it appears that once again "the Internet changes everything." In this changed environment, what measures of quality are most relevant, and...

Understanding the Impact of Video Quality on User Engagement
From Communications of the ACM

Understanding the Impact of Video Quality on User Engagement

As Internet-based videos become mainstream, user expectation for high quality is constantly increasing. In this context, it is crucial for content providers to...

From Communications of the ACM

Technical Perspective: Is Dark Silicon Real?

The microprocessor chip R&D community has been well aware of the so-called "power wall" challenge for over a decade. The following work by Esmaeilzadeh et al. is...

Power Challenges May End the Multicore Era
From Communications of the ACM

Power Challenges May End the Multicore Era

Tthe microprocessor industry has shifted to multicore scaling as its principal strategy for continuing performance growth. However, while transistor count increases...

From Communications of the ACM

Technical Perspective: Visualization, Understanding, and Design

Photographs capture the moment; paintings convey perception, impression, and feeling; illustrations tell stories. Computer graphics aims to enrich all these artistic...

From Communications of the ACM

Illustrating How Mechanical Assemblies Work

How-things-work visualizations use a variety of visual techniques to depict the operation of complex mechanical assemblies. We present an automated approach for...

From Communications of the ACM

Technical Perspective: High-Level Data Structures

This lifting of data structure thinking to the relational level has long inspired computer scientists. In "An Introduction to Data Representation Synthesis," the...

An Introduction to Data Representation Synthesis
From Communications of the ACM

An Introduction to Data Representation Synthesis

We consider the problem of specifying combinations of data structures with complex sharing in a manner that is declarative and results in provably correct code.

From Communications of the ACM

Technical Perspective: The Realities of Home Broadband

Buying residential broadband services seems relatively simple: pick among a small number of plans, and then compare similar plans by price. Unfortunately, reality...

Measuring Home Broadband Performance
From Communications of the ACM

Measuring Home Broadband Performance

We present the results from the first study of Internet access link performance measured directly from home routers. Our findings provide a snapshot of access network...

From Communications of the ACM

Technical Perspective: SQL on an Encrypted Database

There is some risk in trusting the cloud providers with sensitive data. Why not encrypt the data stored in cloud services?

CryptDB: Processing Queries on an Encrypted Database
From Communications of the ACM

CryptDB: Processing Queries on an Encrypted Database

An ideal solution to satisfying the dual goals of protecting data confidentiality and running computations is to enable a server to compute over encrypted data,...

From Communications of the ACM

Technical Perspective: For Better or Worse, Benchmarks Shape a Field

Like other IT fields, computer architects initially reported incomparable results. We quickly saw the folly of this approach. We then went through a sequence...

Looking Back and Looking Forward
From Communications of the ACM

Looking Back and Looking Forward: Power, Performance, and Upheaval

The past 10 years have delivered two significant revolutions. Microprocessor design has been transformed — leading to multicore processors. And an entirely new...

Exact Matrix Completion via Convex Optimization
From Communications of the ACM

Exact Matrix Completion via Convex Optimization

Suppose that one observes an incomplete subset of entries selected from a low-rank matrix. When is it possible to complete the matrix and recover the entries that...

From Communications of the ACM

Technical Perspective: Reconstructing the Unknown, Balancing Structure and Uncertainty

The problem of estimating or reconstructing an unknown structured object from incomplete, partial, noisy measurements is a fundamental one in scientific and technological...

Searching the Village
From Communications of the ACM

Searching the Village: Models and Methods For Social Search

With Aardvark, a social search engine, users ask a question, either by IM, e-mail, Web input, text message, or voice. Aardvark then routes the question to the person...

From Communications of the ACM

Technical Perspective: Who Knows?: Searching For Expertise on the Social Web

It is difficult to remember what people had to do to find the answer to a question before the Web. One option might be to call a friend who might know the answer...

From Communications of the ACM

Technical Perspective: The Benefits of Capability-Based Protection

Affordable personal computing hardware and the usable GUI-based PC operating systems made the vision of "a computer on every desktop and in every home" a reality...

A Taste of Capsicum
From Communications of the ACM

A Taste of Capsicum: Practical Capabilities For Unix

Capsicum is a lightweight operating system capability and sandbox framework planned for inclusion in FreeBSD 9. Capsicum extends, rather than replaces, UNIX APIs...
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