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ネットワークアーキテクチャ Robert Kahn氏特別講演

1 :名無しさん@お腹いっぱい。:04/11/15 16:38:27 ID:XYhA9Rv4
ネットワークアーキテクチャ
の授業ではTCP/IPの生みの親であるRobert Kahn氏が講演を行います。
 SOIではその模様のリアルタイム中継を行います。

http://www.soi.wide.ad.jp/conference/20041115na

2 :名無しさん@お腹いっぱい。:04/11/15 16:43:20 ID:XYhA9Rv4
Selected Major Network Issues

How to get affordable broadband access to
homes, businesses, government, etc.

How to add more dimensionality to the mobile
wireless experience



3 :名無しさん@お腹いっぱい。:04/11/15 16:43:46 ID:XYhA9Rv4
How to take advantage of many
devices/appliances being on the Internet

Protecting critical elements (including
infrastructure elements such as DNS)

Stifling SPAM; detecting and fighting Viruses

4 :名無しさん@お腹いっぱい。:04/11/15 16:44:27 ID:XYhA9Rv4
Selected Major Issues (con’t)
. Identity Management (w/o certificates)
. Trust in the security mechanisms
. Managing Privacy
. How to enable more widespread sharing of
important information on the net
. Trusting your information to the Net
. Managing your information on the Net over
very long periods of time

5 :名無しさん@お腹いっぱい。:04/11/15 16:46:21 ID:XYhA9Rv4
What is the Internet?
. Interestingly, this matter is still unresolved
. The U.S. Federal Networking Council adopted
a definition in 1995 - need to update
www.hpcc.gov/fnc/Internet_res.html
. Not the wires, switches, computers and routers
. Rather it’s a “logical architecture” that allows
relevant components such as different networks
to be interconnected with open interfaces,
protocols and objects

6 :名無しさん@お腹いっぱい。:04/11/15 16:51:19 ID:XYhA9Rv4
Motivation for
the Digital Object Architecture
. To reformulate the Internet architecture around the
notion of uniquely identifiable data structures
. Making use of its world-wide connectivity
. But not necessarily its underlying transport
mechanisms


7 :名無しさん@お腹いっぱい。:04/11/15 16:51:43 ID:XYhA9Rv4
. Enabling existing and new types of information to be
reliably managed and accessed in the Internet
environment over long periods of time
. Providing mechanisms to stimulate dynamic new
forms of expression and to manifest older forms
. While supporting intellectual property protection,
privacy and well-formed business practices

8 :名無しさん@お腹いっぱい。:04/11/15 17:05:14 ID:XYhA9Rv4
Digital Object Architecture
Technical Components
Digital Objects (DOs)
Resolution of Unique Identifiers
Repositories from which DOs may be accessed
Metadata Registries


9 :名無しさん@お腹いっぱい。:04/11/15 17:06:06 ID:XYhA9Rv4
Community Applications of the Technology
Build a cohesive community of repository-based systems,
initially around a core set of projects at universities, nonprofit
organizations, and government
Demonstrate interoperability between heterogeneous
repositories and repository systems
Involve business interests such as the publishing industry

10 :名無しさん@お腹いっぱい。:04/11/15 17:14:33 ID:XYhA9Rv4
Nature of the Repository
. Not like a bookshelf or a pantry
. More like a service-oriented restaurant
. One can deposit & access digital objects
. Deposit produces a “stored digital object”
. Access results in a service that disseminates
information in the form of a DO
. Like restaurant ordering results in a culinary
service which results in an eating experience

11 :名無しさん@お腹いっぱい。:04/11/15 17:19:13 ID:XYhA9Rv4
The Handle System
Distributed Identifier Service on the Internet
based on open interface specifications for a scalable,
extendable, and efficient system (RFCs 3650, 3651, 3652)
First General Purpose Network Indirection system
provides user-defined state information - optimized for speed
& reliability on the Internet


12 :名無しさん@お腹いっぱい。:04/11/15 17:19:43 ID:XYhA9Rv4
Can be used to locate repositories that contain
digital objects given their handles - and more!
More generally, can be used to provide indirect
references - other rapid lookup information (e.g.,PKI)
The DNS was demonstrated to work on the Handle
System and can co-exist with other resolution

13 :名無しさん@お腹いっぱい。:04/11/15 17:20:08 ID:XYhA9Rv4
Handle System Features
.Full featured Identifier service
.Supports ID resolution and administration
. Internationalized character sets
.supports non-ASCII native characters
. Secured resolution service
.Supports client/server authentication, service
integrity, and confidentiality
. Persistent Identifier space
.Separates identity of underlying digital objects
from location

14 :名無しさん@お腹いっぱい。:04/11/15 17:20:57 ID:XYhA9Rv4
MetaObjects & Metadata
Registries
. MetaObjects provide a structural basis for indirection
and for organizing information within the architecture
. MetaObjects are themselves DOs whose elements
may reference other Dos


15 :名無しさん@お腹いっぱい。:04/11/15 17:21:21 ID:XYhA9Rv4
. Metadata is used to characterize digital objects, to
access their identifiers and to assist in cross
referencing
. Metadata may contain terms and conditions for use of
Digital Objects
. Metadata Registries, when repository based, provide
uniform access to metadata across multiple
heterogeneous systems

16 :名無しさん@お腹いっぱい。:04/11/15 17:21:52 ID:XYhA9Rv4
Communication of Digital Objects
Generation or Retrieval of Digital Objects for
Dissemination
Transporting Digital Objects
Making requests of Digital Objects
Sending email to a book


17 :名無しさん@お腹いっぱい。:04/11/15 17:22:04 ID:XYhA9Rv4
Interactions between DOs
Switching Digital Objects
Mapping Handles into IP Addresses at the source
Or using Handles mapped link-by-link in the routers
Managing Disseminations
Observing Relevant Terms and Conditions

18 :名無しさん@お腹いっぱい。:04/11/15 17:22:21 ID:XYhA9Rv4
Managing Rights
. Terms and conditions for use may be
contained within each DO
. They are intended to indicate clearly what one
can and cannot do with a given DO, where
such clarity is intended by the owner of the DO


19 :名無しさん@お腹いっぱい。:04/11/15 17:22:32 ID:XYhA9Rv4
. It is not an enforcement means, although it
may be used by an enforcement system
. Mobile programs that are Digital Objects may
apply such terms to themselves
. And on any digital objects that they contain

20 :名無しさん@お腹いっぱい。:04/11/15 17:23:26 ID:XYhA9Rv4
Attributes of the Handle System
. The basic Architecture of the Handle System
is flat, scaleable, and extensible
. Logically central, but physically decentralized
. Supports Local Handle Servers, when desired
. Handle resolutions return entire “Handle
Records” or portions thereof
. Handle Records are also digital objects
. Handle Servers are certificated with the
system
. Handle Records are signed by the servers

21 :名無しさん@お腹いっぱい。:04/11/15 17:23:57 ID:XYhA9Rv4
Type Resolution
Types are resolvable in the Handle
Types may be created dynamically
Types may be locally named, mapped
strings without semantics
Primary prefix zero “0” is used for system
identifiers
0.type/<type> is the system handle
Other handles may cross reference
handle (e.g. for international use)

22 :名無しさん@お腹いっぱい。:04/11/15 17:24:27 ID:XYhA9Rv4
.Digital objects are uniquely identified in a given identifier space.
.Data elements reference sequences of typed data.
.A Digital Object can have zero or more Content Types to reflect
intended uses by its creator.
.Content Type Operations are accessible as DOs

23 :名無しさん@お腹いっぱい。:04/11/15 17:24:38 ID:XYhA9Rv4
Digital Object Repository
RAP
Client
. Provides distributed Digital Object storage.
. May itself be a Digital Object.
. Provides a dynamic acquisition and
execution mechanism for the mobile code that
implements the content type operations.
. Exclusively accessed using the Repository
Access Protocol (RAP).

24 :名無しさん@お腹いっぱい。:04/11/15 17:25:01 ID:XYhA9Rv4
Setting up a Local Handle Service...
. Download the software from http://www.handle.net
. Follow the instructions in the installation script.
. Send your “site bundle”, containing the IP address
of your server and your administrator information,
to the Global Handle RegistryR (GHR) administrator
. Site is under re-development to accommodate
widespread use via automated means
. Experimental Repository software also available
on-line

25 :名無しさん@お腹いっぱい。:04/11/15 17:25:15 ID:XYhA9Rv4
The Digital Object Identifier (DOIR)
. Used by the International DOI Foundation
(IDF) to reference high-quality materials of
publishers (and other owners of IP)
. Major Commercial User of the Handle
System at present with approximately 12
Million handles
. Usage growing at about 4 Million per year
. DNS domain names, by comparison, are
relatively flat with perhaps 40% churn per
year.

26 :名無しさん@お腹いっぱい。:04/11/15 17:25:46 ID:XYhA9Rv4
Business Potential
. Selling infrastructure technology
. Providing identification, management and
Metadata services
. Enabling third-party value-added capabilities
. Helping organizations manage their own
information better & offer new types of
services
. Stimulating access to “surface information”
and “embedded information” with appropriate
access controls and conditions of use

27 :名無しさん@お腹いっぱい。:04/11/15 17:26:46 ID:XYhA9Rv4
Conclusions
. Managing Digital Objects for long-term access is the
challenge
. Technology Components are available from R&D
. Interoperability is a critical objective
. Applications (with user-friendly interfaces) need to be
developed & deployed; Metadata registries need to be
created and maintained


28 :名無しさん@お腹いっぱい。:04/11/15 17:27:02 ID:XYhA9Rv4
. Third-party value-added providers will ultimately shape the
long-term evolution
. Infrastructure for managing information over indefinite
periods can fundamentally alter the net and how we use it
. With profound impact on both business and society

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