这一实验性的“餐馆系统”是一个很典型商业应用，但并不复杂。归根结底，就实现5个功能：1）增加一个新的预约（涉及数据库中的一个insert操作），2）删除一个被选中的预约（delete操作），3）在一个已有预约上记录到达时间（提前预约的顾客来吃饭了）（对应update操作），4）更改分配给一个预约的餐桌（update操作），5）显示指定日期内所有已有的预约（select操作）。从数据库的角度来看，要实现这些功能不难。在我们的样板系统中，在运行时主要通过以下对象的合作，实现上述功能。
上传时间： 2018-11-02
上传用户：jack110
We were on the lookout for ice. I was in a 32 foot sailing yacht with writer and explorer Tristan Gooley, undertaking a double-handed sail from Scotland through the Faroes up to 66 33 45.7 N and the midnight sun. Now sailing out of the Arctic Circle we were approaching Iceland from the north, heading for the Denmark Straits, where ice flowed south. The Admiralty Pilot warned of bergs but the ice charts we had sailed with were over a week old. We needed an update.
标签： Interference Analysis
上传时间： 2020-05-27
上传用户：shancjb
This book on electrostatic discharge phenomena is essentially a translation and update ofa Swedish edition from 1992. The book is intended for people working with electronic circuits and equipments, in application and development. All personnel should be aware of the ESD-hazards, especially those responsible for quality. ESD-prevention is a part of TQM (Total Quality Management). The book is also usable for courses on the subject.
标签： Electronics Scourge ESD The of
上传时间： 2020-06-05
上传用户：shancjb
Since the original publication of Manual 74 in 1991, and the preceding “Guidelines for Transmission Line Structural Loading” in 1984, the understanding of structural loadings on transmission line structures has broadened signifi cantly. However, improvements in computational capa- bility have enabled the transmission line engineer to more easily deter- mine structural loadings without properly understanding the parameters that affect these loads. Many seasoned professionals have expressed concern for the apparent lack of recent information on the topic of struc- tural loadings as new engineers enter this industry. The Committee on Electrical Transmission Structures is charged with the responsibility to report, evaluate, and provide loading requirements of transmission struc- tures. This task committee was therefore formed to update and revise the 1991 manual.
标签： Transmission Guidelines Electrical Line for
上传时间： 2020-06-07
上传用户：shancjb
The first edition as well as its forerunner of Kuffel and Abdullah published in 1970 and their translations into Japanese and Chinese languages have enjoyed wide international acceptance as basic textbooks in teaching senior under- graduate and postgraduate courses in High-Voltage Engineering. Both texts have also been extensively used by practising engineers engaged in the design and operation of high-voltage equipment. Over the years the authors have received numerous comments from the text’s users with helpful suggestions for improvements. These have been incorporated in the present edition. Major revisions and expansion of several chapters have been made to update the continued progress and developments in high-voltage engineering over the past two decades.
标签： Engineering Voltage High
上传时间： 2020-06-07
上传用户：shancjb
The past decade has seen an explosion of machine learning research and appli- cations; especially, deep learning methods have enabled key advances in many applicationdomains,suchas computervision,speechprocessing,andgameplaying. However, the performance of many machine learning methods is very sensitive to a plethora of design decisions, which constitutes a considerable barrier for new users. This is particularly true in the booming field of deep learning, where human engineers need to select the right neural architectures, training procedures, regularization methods, and hyperparameters of all of these components in order to make their networks do what they are supposed to do with sufficient performance. This process has to be repeated for every application. Even experts are often left with tedious episodes of trial and error until they identify a good set of choices for a particular dataset.
标签： Auto-Machine-Learning-Methods-Sys tems-Challenges
上传时间： 2020-06-10
上传用户：shancjb
-file /win8.vdf 镜像文件名，无此参数将搜索当前目录的iso镜像 -dev PciRoot(0x0)/Pci(0x1,0x1)/Ata(Primary,Master,0x0)/HD(3,MBR,0x9553A441,0xEFFF800,0x13FF800) 设备路径，无此参数默认为当前设备 -wait 50 启动前等待 -mem 将镜像载入内存， -type HD 可选CD HD FD,无此参数默认HD镜像类型，类型错了不能启动 -dev auto 搜索所有设备
上传时间： 2020-12-20
上传用户：
LAN9254 + SAME54 MCU 从站设计•1.支持2/3个port口的EtherCat Slave控制器，并内置有8个FMMU 和8个SyncManagers; 并有8KB的更大的DPRAM存储资源；•2. 8/16bit总线，支持和大多数8/16bit以及32bit的host MCU通讯； •3. 内部集成了支持HP Auto-MDIX的以太网PHY芯片； •4. 支持Wake on Lan以太网远程唤醒技术；兼容EtherCat P协议； •5. 具有低功耗工作模式，可以允许系统进入睡眠模式以节省更多功耗，直到被Master访问； •6. 支持线缆诊断技术； •7. 支持1.8V~3.3V的灵活可变的IO电压，省去需要外加Voltage shifter芯片的成本； •8. 多功能GPIO，可以配置为Local Bus，SPI, PWM，通用GPIO等多种接口功能； •9. 工业级温度范围，最高可以支持105度工业温度要求；
标签： mcu lan9254 ethercat从站
上传时间： 2021-11-09
上传用户：
C10018_RTL8201CP-VD-LF_2012-11-22.PDFSINGLE-CHIP/SINGLE-PORT 10/100M FAST ETHERNET PHYCEIVER (With Auto Crossover) DATASHEET
标签： rtl8201cp
上传时间： 2022-01-13
上传用户：xsr1983
The PW2606B is a front-end over voltage and over current protection device. It achieves wide inputvoltage range from 2.5VDC to 40VDC. The over voltage threshold can be programmed externally orset to internal default setting. The low resistance of integrated power path nFET switch ensures betterperformance for battery charging system applications. It can deliver up to 1A current to satisfy thebattery supply system. It integrates the over-temperature protection shutdown and auto-recoverycircuit with hysteresis to protect against over current events
标签： pw2606b
上传时间： 2022-02-11
上传用户：
