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From Communications of the ACM

Technical Perspective: Building a Safety Net for Data Reuse

The authors of "Guilt-Free Data Reuse" show there is a way to construct a safety net that goes around a fixed dataset so that it may be analyzed interactively without...

Guilt-Free Data Reuse
From Communications of the ACM

Guilt-Free Data Reuse

In this work, we initiate a principled study of how to guarantee the validity of statistical inference in adaptive data analysis.

From Communications of the ACM

Technical Perspective: Proving File Systems Meet Expectations

"Certifying a File System Using Crash Hoare Logic: Correctness in the Presence of Crashes" presents a big step toward real-world file systems that are crash-safe...

Certifying a File System Using Crash Hoare Logic
From Communications of the ACM

Certifying a File System Using Crash Hoare Logic: Correctness in the Presence of Crashes

This paper introduces Crash Hoare logic, which extends traditional Hoare logic with a crash condition, a recovery procedure, and logical address spaces for specifying...

From Communications of the ACM

Technical Perspective: Data Distribution for Fast Joins

What is the most drastic way to reduce the cost of communication for parallel data processing algorithms? This is the question studied in "Reasoning on Data Partitioning...

Reasoning on Data Partitioning for Single-Round Multi-Join Evaluation in Massively Parallel Systems
From Communications of the ACM

Reasoning on Data Partitioning for Single-Round Multi-Join Evaluation in Massively Parallel Systems

We introduce a framework for reasoning about data partitioning to detect when we can avoid the data reshuffling step. 

From Communications of the ACM

Technical Perspective: The Power of Wi-Fi to Deliver Power

The authors of "Powering the Next Billion Devices with Wi-Fi" turn the problem of powering wireless sensor networks on its head. Instead of focusing on energy harvesting...

Powering the Next Billion Devices with Wi-Fi
From Communications of the ACM

Powering the Next Billion Devices with Wi-Fi

We present the first power over Wi-Fi system that delivers power to low-power sensors and devices and works with existing Wi-Fi chipsets.

Authentication Using Pulse-Response Biometrics
From Communications of the ACM

Authentication Using Pulse-Response Biometrics

We propose a new biometric based on the human body's response to an electric square pulse signal, called pulse-response.

From Communications of the ACM

Technical Perspective: Cleaning Up Flaws in TLS Implementations

One unfortunate fact about protocols is that as they get older and applied to more scenarios — and TLS is used basically everywhere — they tend to gain weight....

A Messy State of the Union
From Communications of the ACM

A Messy State of the Union: Taming the Composite State Machines of TLS

We systematically test popular TLS implementations and find unexpected transitions in many of their state machines that have stayed hidden for years. We show how...

From Communications of the ACM

Technical Perspective: Mapping the Universe

"HACC: Extreme Scaling and Performance Across Diverse Architectures" describes the Hardware/Hybrid Accelerated Cosmology Code (HACC) framework, which uses a novel...

HACC
From Communications of the ACM

HACC: Extreme Scaling and Performance Across Diverse Architectures

In this Research Highlight, we demonstrate the success of HACC on two very different machines, the CPU/GPU system Titan and the BG/Q systems Sequoia and Mira, attaining...

From Communications of the ACM

Technical Perspective: Magnifying Motions the Right Way

"Eulerian Video Magnification and Analysis" demonstrates that phase differences at a given frequency band, due to subtle motions in a video, can be independently...

Eulerian Video Magnification and Analysis
From Communications of the ACM

Eulerian Video Magnification and Analysis

We present Eulerian Video Magnification, a computational technique for visualizing subtle color and motion variations in ordinary videos by making the variations...

From Communications of the ACM

Technical Perspective: 3D Image Editing Made Easy

The authors of "Extracting 3D Objects from Photographs Using 3-Sweep" present an important step toward achieving 3D editing.

Extracting 3D Objects from Photographs Using 3-Sweep
From Communications of the ACM

Extracting 3D Objects from Photographs Using 3-Sweep

We introduce an interactive technique to extract and manipulate simple 3D shapes in a single photograph.

From Communications of the ACM

Technical Perspective: The Chemistry of Software-Defined Batteries

A time-tested principle in computer systems design is to use an interface to separate an abstraction from its implementation. "Software-Defined Batteries" represents...

Software-Defined Batteries
From Communications of the ACM

Software-Defined Batteries

In this paper, we present a new hardware-software system, called Software Defined Battery, which allows system designers to integrate batteries of different chemistries...

From Communications of the ACM

Technical Perspective: FPGA Compute Acceleration is First About Energy Efficiency

"A Reconfigurable Fabric for Accelerating Large-Scale Datacenter Services" presents a research deployment of Field Programmable Gate Arrays (FPGAs) in a Microsoft...
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