Найденные страницы с тегом measurements всего 2607

Robust angular synchronization via directed graph neural networks - Amazon Science

The angular synchronization problem aims to accurately estimate (up to a constant additive phase) a set of unknown angles θ1, . . . , θn P r0, 2πq from m noisy measurements of their offsets θi´θj mod 2π. Applications include, for example, sensor network localization, phase retrieval, and…

SPEC extends benchmarks to cloud measurements | Network World

The Standard Performance Evaluation Corporation (SPEC), well known for its computer system benchmarks, is planning to extend its testing methodology to measure cloud deployments as well.

iPad 5 rumor rollup for the week ending July 3 | Network World

The iOSphere discovered a heretofore buried love for all things blue collar with the release of “real” machinist drawings that show, in precise lines and millimeter measurements, the shape of iPad 5.

iPad 5 rumor rollup for the week ending July 3 | Network World

The iOSphere discovered a heretofore buried love for all things blue collar with the release of “real” machinist drawings that show, in precise lines and millimeter measurements, the shape of iPad 5.

[UPDATE: Rocket exploded] Rail-launched rocket set to blast NASA satellite network swarm into space | Network World

The satellites on NASA’s Edison Demonstration of Smallsat Networks (EDSN) mission include cross-link communications and a sensor payload which will activate on orbit and make distributed, space radiation measurements, NASA stated. The EDSN swarm is scheduled to have a 60-day operational period in orbit about 280 miles above Earth. The satellites can talk to each other, share data between them and take turns in relaying science data to the ground. Only one satellite needs to contact the ground on each pas

GPS breakthrough: Low-cost accuracy within centimeters | Network World

A form of antenna motion, where the GPS is moved in wavelength-sized increments, could allow for more accurate GPS measurements with smartphone-grade chipsets, scientists say.

The rules are fuzzy in IP numbers game | Network World

When it comes time to buy Internet services, network executives are inundated with measurements that service providers use to show the size and performance of their IP networks.

WLAN companies make strides with E911 | Network World

Enabling E911 in wireless LANs requires developing triangulation software akin to the capabilities used in cellular networks. Simply put, these applications basically take signal-strength measurements from each of three infrastructure radios (three base stations in the cellular network and three access points in a WLAN) to calculate the whereabouts of a caller.

TouchStone Technologies is spot-on with VoIP monitoring | Network World

The first fundamental requirement of any VoIP analysis and troubleshooting tool is that it report accurate information while monitoring a network. The four basic measurements -- voice quality, latency, packet loss and jitter -- are key metrics that must be assessed accurately and in real time. The key differentiator in this round of testing was the accuracy of the tools in measuring these four key metrics.

Lies, Damned Lies and Latency | Network World

Some vendors' data sheets claim lower latency and jitter than the numbers we measured in this test. While these claims are valid, they also should raise questions about how the measurements were obtained.

Striking out before the season starts | Network World

With this test, we wanted groundbreaking performance measurements first and a comprehensive coverage and correctness assessments second. En route to those goals, we found the IPS systems stumbled so badly on stopping the exploits we threw at them during performance testing; we determined there was no point in proceeding with the coverage and correctness tests

Picking the ‘best’ packet size | Network World

It's a common benchmarking practice to take multiple measurements of throughput or latency, each using a different packet size. There's no one right answer as to which packet size represents the 'best' result.

Viola’s NetAlly Lifecycle Manager aims to address VoIP quality concerns | Network World

VoIP is on the rise with companies anxious to take advantage of the cost savings. Still, questions remain about its reliability and overall quality. Viola Networks recently took steps to help improve the situation when it introduced NetAlly Lifecycle Manager 5.1. The latest release includes a new algorithm for aggregating voice quality measurements among groups of VoIP network calls, referred to as the Service Level Index (SLI).

Why WAN metrics are not enough in SD-WAN policy enforcement | Network World

SD-WAN captures metrics that go far beyond the typical WAN measurements including application response time, network transfer time, and server response time.

Delay: 1 ISP, 1 good month, 1 bad night | Network World

Sprint was the only provider to install the Global Positioning System receivers necessary for precise measurements of one-way delay - the time it takes for each packet to move across Sprint’s network. For many network designers, delay is even more important than throughput in predicting application performance.

NASA spots briny water flows on Mars | Network World

NASA says super briny water is flowing today on the surface of Mars. The water flow evidence was spotted by researchers from Georgia Tech employing NASA’s Mars Reconnaissance Orbiter (MRO) – a 4,800lb spacecraft that has been taking pictures and measurements of Mars since 2006. In this case, using an imaging spectrometer researchers detected signatures of hydrated minerals on slopes where mysterious dark streaks are seen on the red planet in dozens of locations.

How we tested Juniper’s SRX 5800 | Network World

We assessed the Juniper SRX 5800 in terms of performance, features and usability. Because the product is marketed as a security appliance, our tests focused on security performance. We did not look at router metrics, such as BGP performance, although the SRX-5800 does have the full multiprotocol and multilayer JunOS 9.3 routing engine inside. Our security performance tests included separate sets of measurements using stateful TCP and stateless UDP traffic. For both sets of tests, we offered test traffic to

TikTok is restricting hashtags in Creative Center

The functionality of some hashtag links has been disabled, potentially affecting the precision of trend popularity measurements.

TikTok is restricting hashtags in Creative Center

The functionality of some hashtag links has been disabled, potentially affecting the precision of trend popularity measurements.

MongoDB vs. ScyllaDB: Performance, Scalability and Cost - The New Stack

We performed an in-depth benchmarking study comparing the two databases that applied more than 133 measurements. Here are the results.

Remeasured » Linux Magazine

Any application that collects a large number of measurements is bound to have some anomalous measurements, but good sensor breakouts should not out...

Compatible transformer for irregularly sampled multivariate time series - Amazon Science

To analyze multivariate time series, most previous methods assume regular subsampling of time series, where the interval between adjacent measurements and the number of samples remain unchanged. Practically, data collection systems could produce irregularly sampled time series due to sensor…

A (more) accurate camera sensor dynamic range measurement / Habr

Introduction Hello, everyone! In this post, let's talk about how to (more) accurately measure the dynamic range of a camera sensor and what can be done with these measurements. Of course, I am not an...