[Abstract]The new PowerDesigner launches a model diagram for building the cube, while object-oriented modeling supports the UML 2.0 standard. But if PDM is to change the database through the forward engineering, it must adjust the syntax for different brand, PowerDesigner support Oracle, DB2, SQL Server, Sybase, Teradata, MySQL and other brand database, if we differentiate the old and new versions, There are about 60 relational databases supported by
, in an OLAP data similar to Arbor or Oracle Express, information is passed through the customer, production
Products, dates, sales departments and geographical attributes to access, which for data understanding and information acquisition are
Seems very intuitive.
After the OLAP product gets the relational data, it is placed in a very simple table that makes it easy to analyze.
Databases and an OLAP product can be viewed as a multidimensional table. This market is quite popular, Arbor,
Or
balancing and scaling; MS SQL Server provides ha failover functionality, but no load balancing; The Sybase ASE 15 cluster is equivalent to the Oracle RAC function; Teradata itself is a distributed database platform; The MySQL cluster claims that the TPC-C performance benchmark is higher than the Oracle RAC; • IBM DB2/UDB works well on clusters of IBM P-series/power servers and Veritas Vcs/sun that run Aix HACMP (highly available cluster multi-process
Launch Image for the IPhone 6. If you want to quickly test the new effect, here are 3 sample images to download.2. Add Launch screen FileLaunch screen is a new feature of Xcode6 and IOS8, and it uses a xib file as a splash. This property is automatically ignored when the app is launched in the previous version of iOS and does not cause an exception.First, click New File->ios User Interface->launch screen, and then enable it in the project setup:The above two settings allow the app to enter high
. Therefore, the pointer address can be stored in another pointer.
Generally, the number of * can be distinguished by the pointer level. That is to say, ** indicates the pointer to the pointer, ** indicates the pointer to the pointer, and so on:
Int ivals = 1024;
Int * Pi = ival; // PI indicates the number of an int type.
Int ** PPI = PI; // PPI points to an int type pointer.
Here, Pi is a pointer to the
To handle a wide range of resolutions and sizes.
For images, Android uses DPI as the unit. If you select an image, right-click the image under win and you will see the DPI attribute. The higher the DPI, the finer the image. For a mobile phone or display device, a pixel is a point, so DPI = PPI. In turn, it is often said that the height and height of the phone screen PPI are equivalent to the DPI value taken
I. RS485 interface circuit diagram inside the S7-200PLC: see the attachment for circuit diagram
In the figure, R1 and R2 are common resistance with a resistance of 10 euro. Their function is to prevent the generation of an over-current burned-out chip when the RS485 signal D + and D-short circuit are used. Z1 and Z2 are the 6 V clamping voltage, zonea diode with a maximum current of 10A. The 24 V power supply and the 5 V power supply are not isolated. When the common mode dry disturbance voltage
ObjectiveTo do embedded and mobile development, different devices, different resolutions need UI to adapt, this is a very real problem. Qml as a UI for Qt, the use of QML must solve the problem of adaptation.ResolutionNow the same size of the screen, its resolution is also different, in QML with the anchors for the relative layout, it is in pixels. Now there is a concept called pixel number per inch. When the device's PPI is different, the size of the
Copyright Notice: This article is for bloggers original articles, reproduced please indicate the author and source. Strong Light Flashlight [ Ekrem Technology-Wireless business unit ]1. nRF51822 Register TypenRF51822 Register and the general microcontroller is different, the nRF51822 register is divided into the following three kinds.
Task: Mission register, which can be triggered by a program or event.
Events: Event registers, events can cause interrupts or trigger tasks.
Regi
master site, while 200 can only be used as the slave site.For example, the use of PROFIBUS-DP communications, 300, 400 settings for the main station, and 200 + em277 as the slave station for CPU communication.
1. When you use different communication protocols, the s7200plc can be used as the master station or slave station.For example, when the S7-200 CPU is reading and writing other S7-200 CPU data (using the PPI protocol) as the main site (the
Previous precautions and TipsSome time ago the company to do an Android app, but also to adapt to the pad and mobile phone. At first I thought it was impossible to achieve, because the app we saw on the market was two versions, mobile and pad, respectively. Because the size of the phone and screen is too different, it is generally not said that an app is compatible with two versions. in order to achieve screen compatibility, so I specifically go to the Internet to find information, to see the cu
Xcode:320*480 iphone3gs (I've never seen a 3GS physical machine, only seen pictures on the internet, but you need to know this size)640*960 IPhone 4/4s (Design dimensions for the 4 ERA)640*1136 IPhone 5/5s/5c (5 era design size, although now out of 6/6 Plus, but still others use this size design)750*1334 IPhone 6 (currently the latest design size, basically now do iOS app design, use this should be the most)1242*2208 IPhone6 Plus (this is the standard resolution, which is the size required for
unit of resolution, this pixel value is only the effective maximum resolution supported by the camera.640*480 = 307200 = 300,000 pixels 1600*1200 = 1920000 = 2 million pixels 3264*2488 = 8120832 = 8 million pixels 4536*3024 = 13716864 = 14 million pixelsDPI and PPIDPI (Dots per inch) is used in the printing industry to measure space point density, which is the number of ink points the printer can spray per inch. The computer display device draws on the concept of DPI from the printer, since the
PX: logical pixels, abstract units used by the browserDP,PT: device independent pixelsDPR: Device scaling ratioCalculation formula: 1px = (DPR) 2 * DP;The dpr=2 of iphone5;So, 1px is rendered by 4 DPIphone5 's screen is 640DP*1136DP = 320px*568px;TwoDPI: Ink dots that can be sprayed on the printer per inch (printing industry)PPI: The number of pixels per inch of the screen, which is the pixel density within the unit areaAt present, in the computer dis
Recently asked by a friend: CSS set a DOM height:65px, is the height of the display and Android 65DP elements such as high? The brain flashed a bunch of concepts, such as DPR,PPI,DP,PT, but thought for a while, paste, so re-combed the relevant knowledge, in case of a rainy day.1.ppiThe PPI refers to pixels per inch, which is the pixel point of the pixel, where the pixels are the physical pixels (i.e. the sm
inks. If you choose 100% Cyan and 50% Magenta, the final print will get the color of the printed matter. A lot of printers will tell you the value of black four colors. If you want to get the black four-color printing effect, it may not be black enough. Black four colors will mix all ink to get a darker black than pure black.
CMYK mode is the perfect way to show the color of the sample you picked, which is the biggest feature of its relative RGB mode.
Second, set the appropriate
. Therefore, the new imac in the MAC system image display size is actually the same as the previous version, similar to the size of the 2560x1440 resolution, but in fact, whether the font or image details are four times times the original, fine degree can be said to reach the near perfect level.
But if you look at the parameters, the new imac's PPI (the number of pixels per inch) is only 217, not just below the ipad Air 2 264
Objective
Pixel perfection (Pixel perfection), resolution-Independent (resolution independent) and multi-platform experience consistency are the designers ' pursuit. Accessibility (accessability), load performance, and refactoring flexibility are topics of concern to front-end engineers.
The current Internet equipment "surging", the display resolution "endless", for Web creators are bringing more and more problems.
Need to prepare @1.5x, @2x, @3x picture footage for high
GIC is an interrupt controller and should not be confused with arm core interrupts, which are connected to an IRQ or FIQ on ARM core.
To understand arm interrupt system, GIC absolutely must not be missed, good first to pay a picture that everyone can Baidu to.
+ + and * Can not be considered first, for Safe mode.
GIC can be used in a single core multicore system, this time to throw away the simple interruption of the microcontroller, from the figure of SGI (software-generated interrupt),
not able to reproduce easily and don't worry, be on the safe side, in order to get a relatively accurate message or use Getrealsize ().Second, the screen size device physical screen size. Unlike a few years ago, the current phone screen is too big to hold. Standard early has reached the 5-inch screen era.The so-called screen size refers to the length of the diagonal of the screen, in inches.However, different screen sizes can be of the same resolution, and the difference between them is differe
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