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摘要： 什么是ttl电平 TTL电平信号被利用的最多是因为通常数据表示采用二进制规定，+5V等价于逻辑"1"，0V等价于逻辑"0"，这被称做TTL（晶体管-晶体管逻辑电平）信号系统，这是计算机处理器控制的设备内部各部分之间通信的标准技术。TTL电平信号对于计算机处理器控制的设备内部的数据传输是很理想的，首先计算机处理器控制的设备内部的数据传输对于电源的要求不高以及热损耗也较低，另 外TTL电平信号直接与集成电路连接而不需要价格昂贵的线路驱动器以及接收器电路；再者，计算机处理器控制的设备内部的数据传输是在高速下进行的，而 TTL接口的操作恰能满足这个要求。TTL型 阅读全文

摘要： REF:http://blogs.msdn.com/b/vcblog/archive/2009/12/08/c-native-multi-targeting.aspx Hello, my name is Li Shao. I am a Software Design Engineer in Test on the C++ team. For the past two years, I have ... 阅读全文

摘要： REF：https://supporthtml.oracle.com/ep/faces/secure/km/DocumentDisplay.jspx?id=1271017.1&print=Y&bugP... 阅读全文

摘要： Oracle pagination tips Oracle Tips by Vikas Rajan Atrey Also see these important notes on estimating the maximum results from a paginated Oracle SQL query. Invariably while developing data intensive... 阅读全文

摘要： Oracle SQL - pivoting one row of several columns into one column of several rows Oracle Tips by Burleson Consulting There are many ways to use Oracle to pivot column data for display on a single row:... 阅读全文

摘要： SQL wm_concat functionExpert Oracle Tips by Burleson Consulting September 19, 2010 Question: I have a table test_test and I need to count the distinct mark columns and them display all matching valu... 阅读全文

摘要： 主要ZigBee芯片供应商ZigBee方案竞争能力比较 主要ZigBee芯片供应商ZigBee方案竞争能力比较 目前市场上主要ZigBee芯片提供商（2.4GHZ），主要有：TI/CHIPCON、EMBER(ST)、JENNIC(捷力)、FREESCALE、MICROCHIP四家。目前ZigBee技术提供方式有三种： 1) ZigBee RF+MCU 例如：TI CC2420+MSP430 、FREESCLAE MC13XX+GT60 、MICROCHIP MJ2440+PIC MCU。2)单芯片集成SOC 如：TI CC2430/CC2431(8051内核) 、FREESCALE MC13 阅读全文

摘要： Expert Oracle Tips by Burleson ConsultingAugust 24, 2010 Question: We were trying to insert approximately 76 million rows with about 4 gigabytes of space with a batch job when the insert operation failed with the archive log error. What are the best practices for performing large batch insert jobs t 阅读全文

摘要： In later releases of Oracle RAC, the traditional DBA control tools for managing RAC databases have been deprecated, and all commands should use the svrctl utility. lsnrctl: Oracle 10g and beyond have deprecated the lsnrctl command utility, and all listener start and stop commands are done via svrct 阅读全文

摘要： http://files.cnblogs.com/SGSoft/GoogleImageProxy.rar 原理：使用Google提供的缓存服务，将网页下载到本地，支持图片URL，网页URL等。 对于那些被屏蔽的技术网页，如果无法查看，可以使用这个代理将网页或者图片下载回来。 # Legend:# [C] to complete# [N] new request# [U] urgent# [X] ... 阅读全文