Speak little, code much.

Frequency-hopping spread spectrum (FHSS) is a spread-spectrum method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver.

A spread-spectrum transmission offers three main advantages over a fixed-frequency transmission:

1. Spread-spectrum signals are highly resistant to noise and interference. The process of re-collecting a spread signal spreads out noise and interference, causing them to recede into the background.
2. Spread-spectrum signals are difficult to intercept. A Frequency-Hop spread-spectrum signal sounds like a momentary noise burst or simply an increase in the background noise for short Frequency-Hop codes on any narrowband receiver except a Frequency-Hop spread-spectrum receiver using the exact same channel sequence as was used by the transmitter.
3. Spread-spectrum transmissions can share a frequency band with many types of conventional transmissions with minimal interference. The spread-spectrum signals add minimal noise to the narrow-frequency communications, and vice versa. As a result, bandwidth can be utilized more efficiently.

Source:http://en.wikipedia.org/wiki/Frequency_hopping

In telecommunications, direct-sequence spread spectrum (DSSS) is a modulation technique. As with other spread-spectrum technologies, the transmitted signal takes up more bandwidth than the information signal that is being modulated. The carrier signals occur over the full bandwidth (spectrum) of a device transmitting frequency, which is why it is called “spread-spectrum”. DSSS has the following features:

1. It phase-modulates a sine wave pseudorandomly with a continuous string of pseudonoise code symbols called “chips”, each of which has a much shorter duration than an information bit. That is, each information bit is modulated by a sequence of much faster chips. Therefore, the chip rate is much higher than the information signal bit rate.
2. It uses a signal structure in which the sequence of chips produced by the transmitter is known a priori by the receiver. The receiver can then use the same PN sequence to counteract the effect of the PN sequence on the received signal in order to reconstruct the information signal.

Source:http://en.wikipedia.org/wiki/Direct-sequence_spread_spectrum

Spread-spectrum techniques are methods in which energy generated at a single frequency is deliberately spread over a wide band of frequencies. This is done for a variety of reasons, including increasing resistance to natural interference or jamming and to prevent hostile detection.

Source:http://en.wikipedia.org/wiki/Spread_spectrum

東西不錯吃，不過價錢不便宜，掛菜雞加湯不用錢但是羊肉爐加湯要200，人客很多，五常街並排停車多，新警察會開單，老闆一旦發現新警察出現，警告聲一發，食客蜂擁而出的景象蔚為奇觀！

如同尼克隊，就算勇士隊沒進季後賽或是變成常年爛隊，我還是他們的球迷…
從wikipedia看到關於Bobby Cox的文章片段，有點小感觸~

Top 5 Reasons You Can’t Blame…

In September 2006, ESPN Classic aired The Top 5 Reasons You Can’t Blame… Bobby Cox for the Atlanta Braves only winning one World Series. These are the 5 reasons:

5. Bobby Cox – Without Bobby Cox, the Braves would have never had the chances that they had to win it all.

4. Mariano Rivera – The Braves never had a dominant closer like Rivera.

3. Damn Yankees – The Yankees dynasty defeated the Braves on two occasions in the World Series and took away their championship in the 1996 World Series.

2. Rhett Butler – The “I Don’t Give a Damn” persona of the Braves’ fans. Many of the postseason games that were played at Turner Field weren’t sold out and the Braves had been eliminated on many different occasions at home during the playoffs.

1. Mr. October – The Braves never had a clutch hitter like Reggie Jackson during their run, with the exception of David Justice in Game 6 of the 1995 World Series. So many situations in the postseason required a key hit for the Braves and hardly anyone ever came through. However, Mark Lemke and Raphael Belliard were both beating critics expectations on what “short, defensive” infielders bats should do. They both ended up having respectable averages in their post season careers.

Biometrics (ancient Greek: bios ="life", metron ="measure") is the study of automated methods for uniquely recognizing humans based upon one or more intrinsic physical or behavioural traits.

In information technology, biometric authentication refers to technologies that measure and analyze human physical and behavioural characteristics for authentication purposes. Examples of physical characteristics include fingerprints, eye retinas and irises, facial patterns and hand measurements, while examples of mostly behavioural characteristics include signature, gait and typing patterns. Voice is considered a mix of both physical and behavioural characteristics. However, it can be argued that all biometric traits share physical and behavioural aspects.

source:http://en.wikipedia.org/wiki/Biometric