Pattern Analysis is the process of fi nding general relations in a set of data,
and forms the core of many disciplines, from neural networks to so-called syn-
tactical pattern recognition, from statistical pattern recognition to machine
learning and data mining. Applications of pattern analysis range from bioin-
formatics to document retrieval.
As a general rule, PhD students and their supervisors tend to focus
primarily, or even exclusively, on the content of the research that will
go into the doctoral thesis. Other issues are often taken for granted:
how to organize your work, give a presentation, work in a team, cope
with your supervisor, and how to effectively manage your time.When
asked, former PhD students usually claim that the general experience
of being a graduate student, which includes learning how to solve
complex problems and work well with others, was of greater value to
their careers than the actual topic of their thesis.
This project provides a general purpose library which implements read and write support for MMC, SD and SDHC memory cards. Written in ANSI C portable for several Microcontrollers.
■ High Performance, Low Power AVR? 8-Bit Microcontroller
■ Advanced RISC Architecture
–120 Powerful Instructions – Most Single
Clock Cycle Execution
–32 x 8 general Purpose Working Registers
–Fully Static Operation
當前全球定位系統（Navigation Satellite Timing And Ranging Global Position System，簡稱GPS）廣泛應用于艦船導航，航空航天，地理測繪等領域，特別是移動式定位系統對于目前的城市交通管理有著非常重要的意義。本文分析了當前交通管理中的實際問題，介紹了一種車載終端的設計方法。設計采用ARM9內核的S3C2410微處理器構造的嵌入式系統，可以實現對GPS定位信息的接受和處理，并采用嵌入式Linux操作系統，結合開放式Linux圖形軟件Qt，可以為后續的建立地理信息系統（Geographic information system，簡稱GIS）提供數據支持，是集GPS全球衛星定位系統和通用分組無線業務（general Packet Radio Service，簡稱GPRS）無線通信技術于一體的新型電子產品。它為現代交通運輸提供了新穎，可靠，有效的控制和管理途徑。 車載終端通過將GPS模塊的定位信息提取出來，一方面將定位信息在車載終端上顯示，一方面又結合車輛的狀態信息通過GPRS模塊發送出去，該信息通過無線公共網絡傳輸給車輛管理部門。車輛管理部門根據車輛的位置和狀態等，結合GIS系統中的地圖信息提供GPS數據的差分修正，并采取一定的措施，從而實現車輛的有效管理。 本設計從硬件和軟件兩大部分出發，硬件上設計了ARM處理器、存儲器、內存及其外圍電路，另外還有GPS模塊電路和GPRS模塊電路；軟件上采用Qt的人機界面完成數據顯示與更新，采用PPP撥號腳本完成GPRS模塊的撥號，通過Qt多線程編程的方法完成GPS數據的提取和GPRS的信息發送。在硬件和軟件之間采用了嵌入式Linux系統，包括啟動代碼、內核和文件系統等。
視頻目標識別與跟蹤技術是當今世界重要的研究課題,它涉及圖像處理、自動控制、計算機應用等學科,該文主要論述該項目的具體實現及相關理論分析,重點在于該系統的硬件模塊實現及分析.該系統的硬件模塊是典型的高速數字電路,這也是當今世界電路設計的一大熱點.同時,該系統的硬件模塊不同于傳統的模擬、數字電路.嚴格的說它是基于可編程芯片的系統(System On Programmable Chip).它與傳統電路的最大不同在于,硬件模塊本身不具備任何功能,但該硬件模塊可以與相應的軟件結合(此處,我們將FPGA中的可編程指令也廣義的歸入軟件范疇),實現相應的功能.換言之,該硬件模塊通過換用其他軟件,可以實現其他功能.所以從這個意義上講,我們也可以將其稱為基于可編程芯片的通用平臺系統(general System On Programmable Chip).此外,該文還對該系統進行了嘗試性的層狀結構描述,這種描述同樣適用于其它IT目的或電子系統.
general Description
The LM621 is a bipolar IC designed for commutation of
brushless DC motors. The part is compatible with both
three- and four-phase motors. It can directly drive the power
switching devices used to drive the motor. The LM621 provides
an adjustable dead-time circuit to eliminate ``shootthrough''
current spiking in the power switching circuitry.
Operation is from a 5V supply, but output swings of up to
40V are accommodated. The part is packaged in an 18-pin,
dual-in-line package.
Abstract: This application note presents an overview of the operational characteristics of accurate I²C real-time clocks (RTCs),including the DS3231, DS3231M, and DS3232. It focuses on general application guidelines that facilitate use of device resources forpower management, I²C communication circuit configurations, and I²C characteristics relative to device power-up sequences andinitializations. Additional discussions on decoupling are provided to support developing strategies for mitigating power-supply pushingof device frequency.
