Set Up an NTP Server. Using the NTP Time Protocol in Linux. IntroductionConfigurationFirewallsMonitoring and TroubleshootingCarefully Adjusting Your ClockResources Introduction Except for discussion of iptables/ipchains firewalling, this discussion applies to Unix systems in general as well as Linux in particular. I have worked with ntpd, also known as xntpd, versions 4.1 and 4.2, using Red Hat 7.3, 9.0 and SuSE 9.1. The documentation for NTP is voluminous and much of it is devoted to complex issues that may concern an expert setting up groups of time servers for other systems to access.
Practical information for the average system administrator can be hard to extract from all of this, so a short focused article aimed at practical setup issues seemed like it would be valuable. The material here reflects some of the author's personal experiences in setting up ntpd on various Linux systems and can hopefully serve as a practical "NTP HOWTO". This article is probably most useful for someone with system administration experience. Configuration Firewalls t. Overview — NAO Software 1.14.3 documentation.
Cross-correlation. In signal processing, cross-correlation is a measure of similarity of two waveforms as a function of a time-lag applied to one of them. This is also known as a sliding dot product or sliding inner-product. It is commonly used for searching a long signal for a shorter, known feature. It has applications in pattern recognition, single particle analysis, electron tomographic averaging, cryptanalysis, and neurophysiology. For continuous functions f and g, the cross-correlation is defined as: where f* denotes the complex conjugate of f and t is the time lag.
Similarly, for discrete functions, the cross-correlation is defined as: The cross-correlation is similar in nature to the convolution of two functions. In an autocorrelation, which is the cross-correlation of a signal with itself, there will always be a peak at a lag of zero unless the signal is a trivial zero signal. If and is formally given by the cross-correlation (in the signal-processing sense) Explanation[edit] .
Is maximized. Where Let is. ANT (network) ANT is a proprietary open access multicast wireless sensor network technology featuring a wireless communications protocol stack that enables semiconductor radios operating in the 2.4 GHz industrial, scientific, and medical allocation of the RF spectrum ("ISM band") to communicate by establishing standard rules for co-existence, data representation, signalling, authentication, and error detection. The ANT protocol is designed and marketed by ANT Wireless, a division of Dynastream Innovations Inc. (a Cochrane, Canada-based company), which is subsequently a subsidiary of GPS equipment manufacturer Garmin.
The ANT protocol is available on low-power RF transceiver chips from manufacturers such as Nordic Semiconductor (since 2005)[1] and Texas Instruments (since 2010),[2] as well as combination connectivity transceiver chips from manufacturers such as Broadcom, MediaTek or Qualcomm used in cellphones, tablets, etc. A more direct comparison can be drawn with ZigBee.