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Rapid Prototyping of Computer Systems

Rapid Prototyping of Computer Systems. Carnegie Mellon University IBM CMU Computing Services. Handy Andy Overview. Goals Rapidly develop an integrated set of applications and services that use the Wireless Andrew network

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Rapid Prototyping of Computer Systems

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  1. Rapid Prototyping ofComputer Systems Carnegie Mellon University IBM CMU Computing Services Handy Andy

  2. Handy Andy Overview • Goals • Rapidly develop an integrated set of applications and services that use the Wireless Andrew network • Design software that allows people to find and share the information they need as quickly as possible • Solution • Handy Andy: A suite of software designed with the wireless user in mind Handy Andy

  3. Handy Andy • Overview I. Introduction II. Infrastructure & Tools III. Database IV. Location (Stalker) V. Portable Help Desk (PhD) VI. Audio-centric (Waldo) VII. Information Exchange (Idealink) Handy Andy

  4. Infrastructour & Tules • Presenter • Bryan Meyer • Group Members • Yue Cathy Chang • Brian Frankel • Kevin Lin • Seth Matthews • Lisa Nelson Handy Andy

  5. Proposed IBM Architecture Services User Proxies Device Proxies Devices Handy Andy

  6. Final Architecture Database Infrastructure Login/Logout Waldo PhD Idealink Stalker Service Infrastructure User Proxy Device Proxy Device Proxy Device Proxy Speech Encode/Decode Device Itsy Jornada Other Devices Handy Andy

  7. What Did We Implement? • Device • Login/Logout program • Send/Receive wrapper functions for services • Network • Buffer plug-in • Authentication service • Service Layer • Plug-in to communicate with services Handy Andy

  8. Device • Login/Logout Program • Send/Receive wrapper functions for services • Send (data, device#) • Recv (data) Handy Andy

  9. Network • Buffer Plug-in • Device proxy plug-in • Buffers information sent from service to device • Useful if temporarily disconnected • Authentication Service • Connects to database • Authenticated user gets access to all services Infrastructure Login/Logout UP DP Speech Encode/Decode Handy Andy

  10. Database • Presenter • Bryan Meyer • Group Members • Ming Hsu • Frank Lai • Jeremy Shaffer Handy Andy

  11. Database Overview • Responsibilities • Setup, configure, and maintain database and web server • Help other groups link to the content they need • Resources Used • Microsoft SQL Server 7.0 • Active Server Pages (ASP) • Borland C++ stored procedure calls via ODBC Handy Andy

  12. UserInfo Table Field Name Type Size User-Id char 30 Password char 30 Picture char 10 Phone Number char 50 What We Do • Database • Stored procedures sp_CreateUser sp_GetUserInfo sp_ChangeUserInfo • Tables • Permissions Handy Andy

  13. Responsibilities • Accessing the Database • Use ASP web pages to access tables • C++ function calls to database Handy Andy

  14. Stalker • Presenter • Michael Kolb • Group Members • Nate Drees • Ben Ernest-Jones • Sripal Mehta • Chirag Shah Handy Andy

  15. Stalker Overview • Goal: Create a service to provide basic location information to the campus • Use Simple Network Management Protocol (SNMP) to query wireless network access points • Provide hardware address and corresponding access point information to database for location resolution Handy Andy

  16. Information Query Access Handy Andy

  17. Statistics • Entire Network • Total number of access points: 280 • Total query time (real-time): 13 min. 25 sec. • Total query CPU time: 43 sec. • Time for each query: 2.875 sec. • Memory usage: 6,892 KB Handy Andy

  18. Statistics Continued • Demonstration • Total number of access points: 37 • Total query time (real-time): 55 sec. • Total query CPU time: 3 sec. • Time for each query: 1.486 sec. • Memory usage: 7,104 KB Handy Andy

  19. Plans for the Future • Make it Multi-threaded • Currently, to poll all access points, it takes 13 minutes 25 seconds • Use Signal Strength Information • We could get greater precision because we would have information from multiple access points • CMU would almost have a miniature, local Global Positioning System • Greater Need for Security • Our service, while potentially very helpful, could also be dangerous Handy Andy

  20. Portable Help Desk (PhD) • Presenter • Darrin Filer • Group Members • Michael Fortson • Chris Lin • Spencer Moy • Dan Yocum Handy Andy

  21. The Portable Help Desk (PhD) • Functionality • Similar to conventional help desk • Maps • Directories (rooms and people) • Information • Motivation • Utilize wireless, handheld devices to remedy shortcomings of conventional help desks • Out of date information • Fixed format • Stationary Handy Andy

  22. The Portable Help Desk (PhD) • Remedy • User-configurable web pages • Real-time maps and information display • Customizable map formats • Information available in multiple formats Handy Andy

  23. User Interface Design • Design Constraints • Web browser limitations • Bandwidth • Target audience Early Prototype Handy Andy

  24. User Interface Design • UI Design Process • Brainstorm • Paper prototypes • Think-aloud user studies Early Prototype Handy Andy

  25. User Interface Design • User Study Results • Group list confusion • Screen layout improvement • Quick-search Revised Prototype Handy Andy

  26. PhD Features and Interaction • User’s List: • • Items can be added,moved, and removed • Only “checked” items appear on the map • Description: • Information on the currently selected item • Dynamic information automatically updated • Map: • Dynamic information automatically updated Map Controls: Zoom & Pan Handy Andy

  27. System Requirements • PhD Client • Hardware: Jornadas, wirelesslaptops, desktop PCs • Software: Very thin—web browser • Bandwidth • Server-side • Hardware: Desktop PC • Software: Windows NT, Microsoft SQLServer 7.0, web server with ASP Handy Andy

  28. The PhD Server • Active Server Pages (ASP) • Permits thin client strategy • Supports multiple clients • Upgrades and new versions • SQL Database • Shared among multiple services, proxies, and applications • Stored Procedures • Sole method of database interaction • Programmatic access from ASP pages Handy Andy

  29. Web Browser Device Proxy ASP Pages Other Services User Proxy Stored Procedures SQL Tables The Role of Proxies • Device Proxy • Functionality similar to role of web browser • Could be used in conjunction with User Proxy Database Handy Andy

  30. Web Browser Device Proxy ASP Pages Other Services User Proxy Stored Procedures SQL Tables The Role of Proxies • User Proxy • Subset of database stored procedures • Forwards HTTP requests • Appends user-specific information Database Handy Andy

  31. Web Browser Device Proxy ASP Pages Other Services User Proxy Stored Procedures SQL Tables The Role of Proxies • PhD Services • Accessed solely through stored procedures • Database tables are shared • Never accessed through direct queries Database Handy Andy

  32. Waldo • Presenter • Sreekar Gadde • Group Members • Joshua Anhalt • Kevin Auyoung • Meredith Beveridge • Barry Schneider Handy Andy

  33. Waldo Overview • Goal: Voice interface for Handheld Andrew • User speaks to the system naturally • System responds verbally • Provide user-requested services Bob is currently on the Fourth Floor of Wean Where is Bob? Handy Andy

  34. Requirements • Get User Input • Record what the user said • Transfer this recording to aplace where we canprocess it • Translate the Input • Turn the audio input intotext • Determine what the user isasking for • Respond to the User’s Query • Get the information to answer the query • Relay this information to the user Handy Andy

  35. Architecture • Input to System • <Where is Joshua> • Speech to Text • Sphinx • “Where is Joshua” • Grammar Parser • Phoenix • ActionFrame: [Location] (WHERE IS) • ObjectFrame: [Person] ([FIRSTNAME] (JOSHUA)) User’s Speech Audio Digitizer Speech to Text Grammar Parser Handy Andy

  36. Architecture • Action Processor • [Location] (Hamburg Hall 2224) • Response Formatter • “Joshua Anhalt is located in Hamburg Hall 2224” • Text to Speech • Festival • <Joshua Anhalt is located in Hamburg Hall 2224> Handy Andy

  37. Input to the System • Choice Motivated by User Studies • Visibility • Plantronics • Decent audio quality • Volume and quality are generallyconsistent over time Handy Andy

  38. Action Processor • Plug-in Architecture • Each plug-in getssame input • Expandable • Very easy tounderstand Action Processor Error plug-in Contact plug-in Location plug-in Response Formatter Handy Andy

  39. Plans for the Future • Fully Functional Audio Assistant • Appointments with campus-wide Andrew Calendar • Location based to-do list • Sound Bite News Handy Andy

  40. Idealink • Presenter • Cori Swinehart • Group Members • Tridib Chakravarty • Kavin Du • Nathan Los • John Meier • Minh Tran Handy Andy

  41. Idealink Overview • Idealink Is • A digital shared whiteboard • A tool for communicating graphical ideas • The Target Audience Includes • CMU students and faculty • Handheld Andrew users Handy Andy

  42. Conceptual Design Phase • Researched Physical Whiteboards • Several people can draw simultaneously • Encourage flow of creative ideas • Easy to display both text and images • People build off of each other’s work Handy Andy

  43. Limitations and Solutions • Limitations of Physical Whiteboards • Drawing area is too small • Ideas lost when board is erased • All users must be in the same location • Digital Solutions • Infinite space and storage • Remote collaboration is possible Handy Andy

  44. Detailed Design Phase • Design Constraints • Relatively small screen size • Synchronization is critical • User Interface Design Process • Guiding principle: minimal intrusion • Analyzed videos of brainstorming sessions • Interviewed potential users Handy Andy

  45. Interface Features • Powerful Menu Commands • Session management • Geometric tools • Expandable plug-ins Handy Andy

  46. Interface Features • Easy-to-Access Toolbar • Pen colors • Line thicknesses • Eraser Handy Andy

  47. Interface Features • Large Drawing Region • Multiple people can draw simultaneously • Users can join a session while in progress • All users’ drawings are automatically synchronized Handy Andy

  48. Architecture Overview Service broadcasts received coordinates to all clients Clients draw received coordinates on screen; all clients are synchronized Client sends a user’s drawing to the service as a series of coordinates Handy Andy

  49. System Requirements • Wireless Client • Handheld PC running Windows CE • WaveLAN card and network connectivity • Service • Desktop PC running Windows 9x/NT • Network connection with devices Handy Andy

  50. Plans for the Future • Session Archival Features • Service would automatically save session • Thought process would be preserved • Additional Drawing Capabilities • More Communication Among Users • Text-based chat • Post-It Note modifications Handy Andy

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