1. Provide Wireless Technology and Architectural Evaluation This objective calls for investigation on the cutting edge technologies in wireless and thin-client equipment,and the forecast of what would be available in the near future for the best performance and price consideration. 2. Develop Software and System Infrastructure We plan to design an overall wireless campus architecture, including the acquisition of wireless and thin-client devices, the number of required components, and their hierarchical distribution and appropriate layout structure. We will also develop software infrastructure for teaching and learning in wireless networks. This infrastructure includes software components for (i) lecture presentation and student/teacher communication, (ii) graphical user interface design, (iii) multimedia applications for information searching and contents retrieval. 3. Create Wireless Quality Education Service and Content This objective focuses on the development of courseware for wireless setting. The developed courseware will emphasise high interaction and user-friendly multimedia contents. It will also develop wireless-based testing mechanism. Students can perform test in the wireless environment, and testing questions can be dynamically adjusted according to students' learning progress and capabilities.
FHSS is well known for its ability to resist interference and its ability to scale.
Before the release of Windows 95, most games were released for the DOS platform, usually using something like DOS4GW or some other 32-bit DOSextender to obtain access to 32-bit protected mode. Windows 95, however, seemed to signal the beginning of the end of the DOS prompt. Games developers began to wonder how they were going to write games optimally that would run under Windows 95 - games typically need to run in full-screen mode, and need to get as close as possible to your hardware. Windows 95 seemed to be &quot;getting in the way&quot; of this. DOS had allowed them to program as &quot;close to the metal&quot; as possible, that is, get straight to the hardware, without going through layers of abstraction and encapsulation. In those days, the extra overhead of a generic API would have made games too slow. So Microsoft's answer to this problem was a Software Development Kit (SDK) called DirectX API can work with Visual C, Watcom C and Borland C Provide standard way: For example, Direct3D provides a &quot;standard&quot; programming interface that can be used to access the 3D hardware acceleration features of almost all 3D cards on the market which have Direct3D drivers written for them. In theory this is supposed to make it possible for one application to transparently run as it is supposed to across a wide variety of different hardware configurations. In practice, it usually isn't this simple.
DirectX is designed with hardware acceleration in mind. It tries to provide the lowest possible level access to hardware, while still remaining a generic interface. HAL provide standard interface for accessing the same kind of hardware Request for hardware, search if the hardware exist, if no , use HEL 2 possibilities of using HEL: ignore or use software to simulate Provide the lowest possible level access to hardware. Speed... Abstraction of hardware: developers no need to concern about the implementation details of that hardware. reducing the complexity of installation and configuration. Support future hardware just install the newer version of direct x and ur program will support the new hardware automatically.
Wireless Campus LYU9902 By Starsky Wong, Marti Wong 1999, All rights reserved 11th Oct, 99
- Mobility, Installation Speed and Simplicity, Installation Flexibility, Scalability … etc.
Wireless LAN Configurations
Evaluation of some Wireless Devices 1, Proxim RangeLAN2 Wireless LAN Proxim uses license-free 2.4 GHz Frequency Hopping Spread Spectrum (FHSS) technology for robustness and scalability. Ethernet and Token Ring Access Points Radio Data Rate : 1.6 Mbps Channels : Supports 15 independent virtual channels Range : 150 meters indoor, 300+ meters outdoors Platform : Windows 95/98/NT, WinCE RangeLAN2 7401/02 PC Card Specifications
Evaluation of some Wireless Devices (cont’d) 2, Apple iBook Airport Specifications Radio Data Rate : 11 Mbps Range : 150 meters indoor Platform : MacOS 8.6 iBook, Airport station and Airport card
Evaluation of some Wireless Devices (cont’d) 3, WaveLAN WaveLAN IEEE Turbo PC Card WavePOINT-II Access Point Specifications Radio Data Rate : 2 - 6 Mbps (4 Speed Options, can be chosen by user) Range : 120 - 540 meters indoor (Depends on speed) Platform : Windows 95/98/NT, WinCE, Apple, IEEE 802.11 (e.g. Linux) Use Frequency Band from 2400MHz to 2483.5 MHz