In addition to the complex aspects of exposure and metering, Photography enthusiasts often find that depth of field is the most difficult concept to grasp. This is not hard to understand, because it is a coefficient of assumptions based on subjective judgment. If some people really pay attention to these technical issues, others simply stick to their backs to cope with night school courses, however, many people almost ignore technical issues or simply absorb something in urgent need. I have to a
P90, p90
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About fn p90
To meet the requirements, FN designers abandoned the idea of improving 9mm bullets and decided to re-design a new cylinder. They designed a 5.7x28mm SS90 bullet for P90, this type of bullet uses a composite bullet to reduce the weight. The weight of the SS90 bullet is only 5.5 grams, while that of the NATO 5.56mm SSl09 bullet is 12.5 grams. The new bullet uses a slow-burning propellant, which reduces the impulse of the rear seat. In addition, the gun uses the back
changes, all mappings must be updated in the system. In P2P systems, the buffer changes are equivalent to adding or exiting peer systems. This situation occurs frequently in P2P systems, resulting in great computing and transmission load. Monotonic means that the hash algorithm is required to cope with this situation.
Spread)
In a distributed environment, terminals may not be able to see all the buffers, but only some of them. When the terminal wants to map content to the buffer th
application. Based on functions, the system includes the root key system, master key system, initial key system, and samka key system. The system structure has certain scalability. You can reduce or increase the hierarchical hierarchy according to your actual needs. Generally, the level-3 Transfer relationship is not higher than the level-3 Transfer relationship (as shown in the figure) to avoid system complexity. In the system we put into practical use, according to user requirements and syste
original point of the 1 class, the line through the origin is the projection line, from the diagram can be clearly seen, the red dots and blue dots are clearly separated from the original point , this data is just casually painted, if in the case of high-dimensional, It will look a little better. Let me deduce the formula for the two category LDA problem:Suppose that the line (projection function) used to differentiate two classifications is:One goal of the LDA classification is to make the dis
. Because multiple drives increase the mean time between failures (MTBF), storing redundant data also increases fault tolerance.
Improved reliability through redundancy
Improve performance with parallel processing
12.7.3 RAID levelMirroring provides high reliability, but is expensive; dispersion provides high data transfer rates, but does not improve reliability.Disk dispersion and "parity
Gen_batches (Len (X), $): = Nbrs.kneighbors (X[batch,:], return_distance=True) + = Np.max (d, Axis=1). SUM ( )return bandwidth/x.shape[0]The default quantile of this estimate_bandwidth is 0.3, which is the average maximum distance of the surrounding 30% neighbors. Such a large percentage of neighbors, plus the maximum distance obtained, is used here to estimate that our radius should be feasible. Of course the user can also give radius.Then the RADIUS-based K-Nearest neighbor i
patterns. Obviously, the MVC pattern is part of this pattern. The MVC pattern often includes the mediator (mediator) pattern, the Strategy (strategy) pattern, the composition (Composite) pattern, the Observer (Observer) pattern, and so on.In addition, the common architectural patterns are:· Layers (layered) mode, sometimes also called tiers mode· Blackboard (blackboard) mode· Broker (Mediation) mode· Distributed Process (dispersion) mode· Microkernel
the traditional locomotive technology, the high-speed railway train has the characteristics of fast speed, much pulling, more types, creating value, comfortable and modern, and the high speed, mass, variety, high value and visualization of big data.High speed"Harmony" high-speed railway using EMU technology, compared to the "Dongfeng" internal combustion engine traction locomotive, its power-driven technology has been a revolutionary improvement, so as to ensure that the train speed from 100 km
[Email protected] ~]# ntpdate-u time.uuwatch.com9 Jul 11:18:50 ntpdate[853]: No server suitable for synchronization found[Email protected] ~]# ntpdate-d time.uuwatch.com9 Jul 11:20:01 ntpdate[896]: ntpdate [email protected] Sat Nov 18:21:48 UTC 2013 (1)Looking for host time.uuwatch.com and service NTPHost Found:master.uc.uuwatch.comTransmit (192.168.5.211)Transmit (192.168.5.211)Transmit (192.168.5.211)Transmit (192.168.5.211)Transmit (192.168.5.211)192.168.5.211:server Dropped:no DataServer 192
problem, as shown in:The Red Square point is the original point of the 0 class, the blue Square point is the original point of the 1 class, the line through the origin is the projection line, from the diagram can be clearly seen, the red dots and blue dots are clearly separated from the original point , this data is just casually painted, if in the case of high-dimensional, It will look a little better. Let me deduce the formula for the two category LDA problem:Suppose that the line (projection
and multi-mode modes. The difference is:
1. Single-Mode Optical Fiber core diameter is about 10 m), only one transmission mode is allowed, the dispersion is small, and the work is at a long wavelength of 1310nm and 1550nm), it is relatively difficult to coupling with the optical device.
2. Multi-Mode Optical Fiber Core Diameter of 62.5 m or 50 m), allows transmission in hundreds of modes, large dispersion
original point of the 1 class, the line through the origin is the projection line, from the diagram can be clearly seen, the red dots and blue dots are clearly separated from the original point , this data is just casually painted, if in the case of high-dimensional, It will look a little better. Let me deduce the formula for the two category LDA problem:Suppose that the line (projection function) used to differentiate two classifications is:One goal of the LDA classification is to make the dis
Recently, when fiddling with data dispersion, I encountered a graph called box diagram (BoxPlot). It works well for discrete distributions of display data.The box was invented in 1977 by John Tukey, the American statistician John Tuki. It consists of five numeric points: Minimum (min), lower four (Q1), median (median), Upper four (Q3), Maximum (max). You can also add an average (mean) to the box diagram. Such as. The next four-digit, median, and four-
Wavelength:There are currently 3 main types:850nm (MM, multimode, low cost but short transmission distance, generally only transfer 500M);1310nm (SM, single mode, transmission process loss of large but small dispersion, generally used for transmission within 40KM);1550nm (SM, single mode, transmission process loss of small but large dispersion, generally used for over 40KM long-distance transmission, the f
situation should be avoided because it causes the same content to be stored in different buffers, reducing the system storage efficiency. Dispersion is defined as the severity of the above situation. A good hash algorithm should be able to avoid inconsistencies as much as possible, that is, to minimize dispersion.
Load)
The load problem is actually a problem of decentralization from another perspectiv
See the 2016 version of the Laravel series Getting Started tutorial (a) Here is a passage:
Eloquent is the Laravel ORM, the most powerful place in the Laravel system, not one of them. The original Laravel author in the development of the first version of the time spent a full one-third to get out eloquent. Of course, "to practice this work, must first self-palace", eloquent is also the slowest place in Laravel, so far cannot solve. (Routing, auto-loading, configuration
.
Number of Median
The numbers are arranged sequentially, from the smallest to the largest, and if there are an odd number of values, the median is the number in the middle. If there are n numbers, the median position is (n+1)/2, if there is an even number of values, the two intermediate numbers are added, and then divided by 2. The algorithm for the median position is: (n+1)/2, and two intermediate numbers are located on each side of the middle position.
Used when the d
original point of the 1 class, the line through the origin is the projection line, from the diagram can be clearly seen, the red dots and blue dots are clearly separated from the original point , this data is just casually painted, if in the case of high-dimensional, It will look a little better. Let me deduce the formula for the two category LDA problem:Suppose that the line (projection function) used to differentiate two classifications is:One goal of the LDA classification is to make the dis
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