數字信號處理器dsPIC33F集多通道高精度A/D轉換、多通訊模式、看門狗、CMOS Flash技術等于一體，其內部可完成所有數據操作，實現總線不出芯片技術。將該處理器應用于微機保護裝置，提出基于dsPIC33F微處理器的微機保護裝置的設計方案，給出相應的接口電路與軟件流程。該設計方案結構簡單，性價比及可靠性高，開發周期短，具有一定的實用推廣價值。所研制的微機保護裝置現場運行效果良好。
Abstract:
The dsPIC33F microprocessor has a plentiful interior resource which contains multi-channel，high precision A/D converters，multi-communication module，watchdog，CMOS Flash technology，and so on.All data manipulations is accomplished interiorly.What is more，it makes the technology that bus does not go beyond the chip comes into Practice.The paper put forwards a design scheme based on dsPIC33F microprocessor.The scheme has the advantages of simple structure，high reliability and shortened exploitation cycle.What is more，it has definite practicality and reference.The microcomputer protection device has been put into operation with excellent effects.
針對視頻監控中攝像機鏡頭光圈大小、圖像聚焦、圖像變焦三項參數的控制問題，介紹了一種基于89C51單片機的鏡頭控制電路的設計。 該電路以89C51單片機為核心，結構簡單，成本低廉，控制可靠，實現了智能監控終端對攝像參數的完全控制。
Abstract:
The design of camera lens control circuit based on 89C51 is introduced. This circuit can adjust parameters of camera such as aperture, zoom and focusing. The Practice of project shows that this circuit has advantages of structure simple, low cost and high reliability.
The main objective of this book is to present all the relevant informationrequired for RF and micro-wave power amplifier design includingwell-known and novel theoretical approaches and practical design techniquesas well as to suggest optimum design approaches effectively combininganalytical calculations and computer-aided design. This bookcan also be very useful for lecturing to promote the analytical way ofthinking with practical verification by making a bridge between theoryand Practice of RF and microwave engineering. As it often happens, anew result is the well-forgotten old one. Therefore, the demonstrationof not only new results based on new technologies or circuit schematicsis given, but some sufficiently old ideas or approaches are also introduced,that could be very useful in modern Practice or could contributeto appearance of new ideas or schematic techniques.
Semiconductor memory, card readers, microprocessors,disc drives, piezoelectric devices and digitally based systemsfurnish transient loads that a voltage regulator mustservice. Ideally, regulator output is invariant during a loadtransient. In Practice, some variation is encountered andbecomes problematic if allowable operating voltage tolerancesare exceeded. This mandates testing the regulatorand its associated support components to verify desiredperformance under transient loading conditions. Variousmethods are employable to generate transient loads, allowingobservation of regulator response
Beginning with an introduction to 802.11b in general, 802.11 Security gives you a broad basis in theory and Practice of wireless security, dispelling some of the myths along the way. In doing so, they provide you with the technical grounding required to think about how the rest of the book applies to your specific needs and situations. If you are a network, security, or systems engineer, or anyone interested in deploying 802.11b--based systems, you ll want this book beside you every step of the way.
軟件開發工程是有趣的、多產的，甚至是大膽的。同時，它也能源源不斷地帶來商業價值，并保持在我們的掌控之下。 極限編程(XP)的構思和發展是針對小型團隊進行軟件開發時，在面對不確知的、變化的需求時所產生的特定需要的。這一新的、輕量級的方法學對許多傳統思維提出了挑戰，這其中包括一個一直以來的假設，即在軟件開發過程中，對軟件進行一個小小的改動就必然會使其開發成本大大增加。極限編程認可軟件開發工程應該節約成本，而且一旦實現了某種節約就應該加以開發利用。 你可以喜歡XP，也可以恨它，但是本書將會使你對如何開發軟件有一個全新的認識。KentBeck擁有并經營著First Class軟件公司，在這里他把主要精力放在兩個最大的興趣上——模式和極限編程。他一直在研究軟件開發的先驅模式、CRC卡、HotDraw畫圖編輯器框架、xUnit單元測試框架以及測試為先的編程。他發表了五十多篇關于編程的文章，并出版了《The Smalltalk Best Practice Patterns》(Prentice-Hall出版社)和《Kent Beck’s Guide to Better Smalltalk：A Sorted Collection》(劍橋大學出版社)兩本著作，同時他還是超級暢銷書《重構——改善既有代碼的設計》(中英文版皆由中國電力出版社出版)的特約撰稿人。
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With the release of PHP 5 web developers need a guide to developing with PHP 5 to both learn its complex new features and more fully implement the long-standing features on which PHP s success is built. PHP 5 in Practice is a reference guide that provides developers with easy-to-use and easily extensible code to solve common PHP problems. It focuses on providing real code solutions to problems, allowing the reader to learn by seeing exactly what is happening behind the scenes to get your solution. Because a real-life situation will rarely match the book s example problems precisely, PHP 5 in Practice explains the solution well enough that you will understand it and can learn how to truly solve your own problem.
