1. System Software for Ubiquitous Computing
유비퀴터시 시스템을 실제로 운용할 때 생길 수 있는 문제점들에 대한 내용을 정리하였다.
즉 시스템 소프트웨어에 대한 내용은 아니다. (제목을 잘못 지었음)
Presented by 진성근

2. Ubiquitous !! But, How?

3. Outline Characteristics of ubiquitous systems The semantic Rubicon
Discussion areas related to ubicomp
Summary

4. Characteristics of ubiquitous systems
Physical integration
Integration between computing nodes and physical world
Spontaneous interoperation
Spontaneous interoperating in changing environments
Need to cope with the highly dynamic and unpredictable changes of users, HW, and SW

5. Semantic Rubicon What is Semantic Rubicon
Division between system and user for high-level decision-making or physical-world semantics processing world

6. Progress report Discovery Adaptation Integration Programming framework
Robustness
Security

7. Discovery and interaction
Service discovery
Example
Address allocation and name resolution
Challenges
Avoiding overspecification
More abstract and much less detailed specifications can lead to ambiguity
Interaction
Event systems and tuple-spaces

8. Adaptation Varying resources Content adaptation
Ubicomp should deal with limited and dynamically varying computational resources
Content adaptation
Content adaptation among various heterogeneous device types

9. Integration Integration with the physical world
It needs low-level application programming interfaces
software is able to deal with physical sensors
It needs high-level software framework
Applications can sense and interact with their environment

10. Programming frameworks
Compatibility
To leverage existing applications
Because of large investment in the applications, their data, and knowledge of how to use them
To leverage Oss without modification
Oss are fragile, most users are reluctant or insufficiently sophisticated to apply OS patches, and OS functionality is generally regarded as beyond application writers’ control

11. Robustness and Routine Failures
Ubiquitous systems using wireless
A radical increase of failure frequency due to wireless networking
Solutions
Expiration-based schemes and soft state
Periodic advertisement announcing its presence or availability to the directory service
Separating operations
Failure-free and failure-prone operations
Provide a method to solve the failures.
Group communication for ‘free’ indirection
To provide a level of indirection that helps rediscover lost resources

12. Security Trust Security for resource-poor devices Access control
Spontaneous interoperation
Exchange cryptographic keys
Security for resource-poor devices
Resource-poor devices do not have sufficient computing resources for asymmetric encryption  symmetric encryption
Access control
Knowing an identified user’s whereabouts raises privacy issues
It can be advantageous to issue time-limited capabilities

13. What is this?

14. Summary When developing ubicomp software
Ubicomp devices are small and resource constraint
Human should step a side for spontaneous interoperation
Ubicomp should be a part of our lives.