This book is an introduction to Ada 95. It uses an example-driven approach which gradually develops small trivial programs into large case-study type programs. The main emphasis of this book is on maintenance problems, and using object-oriented technology to write maintainable, extensible programs. Program design is introduced throughout the book, with hypothetical maintenance scenarios used to shoe design shortcomings. and revise them to accomodate maintenance needs. Practical issues such as debugging programs are tackled, and important Ada features not found in other languages are dealt with practically and early on in the text. These include exception handling, user-defined types, procedures, functions, packages and child packages.
標簽： example-driven introduction gradually approach
上傳時間： 2014-01-12
上傳用戶：koulian
We analyze, both analytically and numerically, the effectiveness of cloaking an infinite cylinder from observations by electromagnetic waves in three dimensions. We show that, as truncated approximations of the ideal permittivity and permeability tensors tend towards the singular ideal cloaking fields, so that the anisotropy ratio tends to infinity, the D and B fields blow up near the cloaking surface. Since the metamaterials used to implement cloaking are based on effective medium theory, the resulting large variation in D and B will pose a challenge to the suitability of the field averaged characterization of " and 碌. We also consider cloaking with and without the SHS (softand- hard surface) lining, shown in [6] to be theoretically necessary for cloaking in the cylindrical geometry. We demonstrate numerically that cloaking is significantly improved by the SHS lining, with both the far field of the scattered wave significantly reduced and the blow up of D and B prevented.
標簽： effectiveness analytically numerically cloaking
上傳時間： 2017-03-30
上傳用戶：zxc23456789
Picking Up Perl is a freely redistributable tutorial book on Perl that can be downloaded in pdf, postscript, or textinfo format. It can also be viewed online in html format, either as one large file or as separate files for each chapter.
標簽： Perl redistributable downloaded tutorial
上傳時間： 2014-01-14
上傳用戶：colinal
2007年全國大學生電子設計大賽，A題音頻信號分析儀的全部源程序。 單片機為c8051f120，系統時鐘倍頻至96MHZ。 main.c是一個包含五級菜單的主函數。 FFT.C是進行fft變換，將時域信號變換成頻域信號。 flash.c是讀寫片外flash存儲器的程序,可以將分析結果保存,以備調用. z7290.c是周立功7290鍵盤芯片的驅動程序. FFT_xgjis.c是對變換后的頻譜進行分析和運算. FFT_CodeTable.c是一個正弦表,在FFT的時候調用. LCD320240.c是320*240的液晶驅動程序,液晶的控制器是SED1335. 所有的.h文件提供了子函數的定義. 本程序用KEIL3 802版本編譯通過，將所有的.C文件添加到工程中，并編譯main.c 注意兩點:1.器件選擇c8051f120. 2.在target中將時鐘設為96M.同時必須將Memory Model 改成large--XDATA.默認的是small. 因為本設計占用的資源是非常大的. Program Size: data=81.3 xdata=6811 code=43056
上傳時間： 2014-01-05
上傳用戶：manlian
This gorgeous, full-color book will guide you through the complete design process, from getting inspiration and sketching ideas out, through to choosing a color scheme, designing the layout, and selecting effective imagery. Throughout, the focus is on simple and practical techniques that anyone can use 鈥?you don鈥檛 need to have gone to art school or have artistic flair to create stunning designs using the methods outlined in this book. You鈥檒l follow along as author and design guru Jason Beaird creates a complete web site layout using the techniques that you鈥檝e learned. The book鈥檚 full-color layout and large format (8鈥?x 10鈥? make The Principles Of Beautiful Wed Design a pleasure to read.
標簽： full-color gorgeous complete getting
上傳時間： 2017-05-08
上傳用戶：2404
Servomotors are available as AC or DC motors. Early servomotors were generally DC motors because the only type of control for large currents was through SCRs for many years. As transistors became capable of controlling larger currents and switching the large currents at higher frequencies, the AC servomotor became used more often. Early servomotors were specifically designed for servo amplifiers. Today a class of motors is designed for applica-tions that may use a servo amplifier or a variable-frequency controller, which means that a motor may be used in a servo system in one application, and used in a variable-frequency drive in another application. Some companies also call any closed-loop system that does not use a stepper motor a servo system, so it is possible for a simple AC induction motor that is connected to a velocity controller to be called a servomotor.
標簽： motors Servomotors servomotors available
上傳時間： 2014-08-10
上傳用戶：源碼3
A Design and Implementation of The Online Shopping System Abstract: Along with the development of the computer ,the database technique is widespread in the application of Internet, more and more , providing more thoughtful and humanized service for the large network customer. Characteristic services have already become gradually the current as the application of Wed nowadays. This text studied a method of project which composed of characteristic page and dynamic state of technical customer according to the data connection rule, compared with some projects that adopt already on present nets, this project have the advantage of providing customers more simple ,reflective obvious meticulous use and so on..
標簽： Implementation development Abstract Shopping
上傳時間： 2014-12-04
上傳用戶：410805624
Find an introduction to the architecture, concepts and algorithms of the Linux kernel in Professional Linux Kernel Architecture, a guide to the kernel sources and large number of connections among subsystems.
標簽： introduction architecture Professiona algorithms
上傳時間： 2014-01-15
上傳用戶：TRIFCT
Watermarking schemes evaluation Abstract鈥擠igital watermarking has been presented as a solution to copy protection of multimedia objects and dozens of schemes and algorithms have been proposed. Two main problems seriously darken the future of this technology though. Firstly, the large number of attacks and weaknesses which appear as fast as new algorithms are proposed, emphasizes the limits of this technology and in particu-lar the fact that it may not match users expectations. Secondly, the requirements, tools and methodologies to assess the current technologies are almost non-existent. The lack of benchmarking of current algorithms is bla-tant. This confuses rights holders as well as software and hardware manufacturers and prevents them from using the solution appropriate to their needs. Indeed basing long-lived protection schemes on badly tested watermarking technology does not make sense.
標簽： Watermarking watermarking evaluation presented
上傳時間： 2013-12-04
上傳用戶：thinode
The most straightforward approximation is the standard Gaussian approximation, where the MAI is approximated by a Gaussian random variable. This approximation is simple, however it is not accurate in general. In situations where the number of users is not large, the Gaussian approximation is not appropriate. In-depth analysis of must be applied. The Holtzman?s improved Gaussian approximation provides a better approximation to the MAI term. The approximation conditions the interference term on the operation condition of each user.
標簽： approximation straightforward the Gaussian
上傳時間： 2017-06-03
上傳用戶：dyctj
