Y. Sato, "DeleGate Server", Mar 1994. (URL:http://wall.etl.go.jp/delegate/)  Home/Search   Document Not in Database   Summary   Related Articles   Check

....deployment options, and implementation details have been subject to research. An overview of research issues in web caching is given in [1, 2] Content adaptation research is another area with relevance to our approach. Early efforts date back to the DeleGate Gopher proxy for Kanji transcoding [20], started in 1994. Leveraging content adaptation to adapt to the capabilities of mobile devices was investigated by the Daedalus project at the UC Berkeley. It has proven that on demand dynamic adaptation of text and images by proxies is feasible and powerful [9] The concept of proxy based ....

Y. Sato, "DeleGate Server", Mar 1994. (URL:http://wall.etl.go.jp/delegate/)

....on mobile agents [28] has focused on supporting distributed artificial intelligence, active proxies share many of the same systems level concerns, such as code mobility, naming, security, and coordination. Many projects have used transcoding to adapt service content to better suit small devices [6, 15, 29, 34, 35, 36, 49, 50]. Additionally, a number of projects have attempted to develop universal interfaces for large classes of devices, including the recent WAP protocol stack [44] Instead of assuming that a single standard will be adopted by all devices, the Ninja architecture allows multiple standards to be bridged ....

Y. Sato. DeleGate Server, March 1994. http://wall.etl. go. jp/delegate/.

....HP s e Speak [17] does target for wide area operation but does not address service scalability and fault tolerance; nor does it provide access from simple devices that are incapable of running java based communication protocol. Our work is heavily influenced by projects (e.g. 18] 19] [20], 21] 22] 23] 24] that transcode to adapt service content to better suit impoverished small devices. However, these approaches are vertically integrated. They do not use composition as a way to easily extend system functionality. Furthermore, quite a number of works have tried to develop a ....

Y. Sato, "DeleGate Server," http://wall.etl.go.jp/ delegate/, March 1994.

....e.g. workgroup. HP s e Speak [18] does target for wide area operation but does not address service scalability and fault tolerance; nor does it provide access from simple devices that are incapable of running java based communication protocol. Our work is heavily in uenced by projects (e.g. [1, 20, 29, 30, 31, 41, 40]) that transcode to adapt service content to better suit impoverished small devices. However, these approaches are vertically integrated. They do not use composition as a way to easily extend system functionality. Furthermore, quite a number of works have tried to develop a single interface for ....

Y. Sato. DeleGate Server. http://wall.etl.go.jp/delegate/, March 1994.

....on mobile agents [28] has focused on supporting distributed arti cial intelligence, active proxies share many of the same systems level concerns, such as code mobility, naming, security, and coordination. Many projects have used transcoding to adapt service content to better suit small devices [6, 15, 29, 34, 35, 36, 49, 50]. Additionally, a number of projects have attempted to develop universal interfaces for large classes of devices, including the recent WAP protocol stack [44] Instead of assuming that a single standard will be adopted by all devices, the Ninja architecture allows multiple standards to be bridged ....

Y. Sato. DeleGate Server, March 1994. http://wall.etl. go.jp/delegate/.

....wireless) networks [5] At the application level, data transformation by proxy interposition has become particularly popular for HTTP, whose proxy mechanism was originally intended for users behind security firewalls. The mechanism has been harnessed for anonymization [8] Kanji transcoding [36, 41], application specific stream transformation [7] and personalized associates for Web browsing [6, 37] Some projects provide an integrated solution with both network level and application level mechanisms [30, 17, 43] though none propose a uniform application development model analogous to ....

Y. Sato. DeleGate Server, March 1994. http:// wall.etl.go.jp/delegate/.

....of mechanisms. Examples include translation of Web pages among different languages (http: babelfish. altavista.digital.com) anonymization proxies (http: www.anonymizer.com) compression proxies (http: transend.cs. berkeley.edu and [52] and application level content transformation gateways [53, 114, 117, 135]. How could such a simple set of mechanisms be augmented to support the other components of the online bookstore, while preserving the invariant that tasks be restartable The key to the answer is that the mechanisms must be designed to compose with other mechanisms. One possibility is to compose ....

....to store inter session persistent state in the client filesystem. 1.2 Semi Transparent Agents For Semantic Transformation Proxy mechanisms have also been used to transparently modify content on the fly at a high level. Current examples of such semantic transformation include Kanji transcoding [114], Kanji to GIF conversion [135] and language translation [1] A less drastic form of semantic transformation is illustrated by personal Web browsing assistants such as Open Group s Wide Area Information Browsing Assistants (WAIBA) 116] and IBM WBI [10] these agents dynamically annotate the ....

Y. Sato. DeleGate Server, March 1994. http://wall.etl.go.jp/delegate/. 161

....wireless) networks [17, 4] At the application level, data transformation by proxy interposition has become particularly popular for HTTP, whose proxy mechanism was originally intended for users behind security firewalls. The mechanism has been harnessed for anonymization [7] Kanji transcoding [36, 40], application specific stream transformation [6] and personalized associates for Web browsing [5, 37] Some projects provide an integrated solution with both network level and application level mechanisms [18, 19, 42] though none propose a uniform application development model analogous to ....

Y. Sato. Delegate server.

....firewalls. The mechanism has been used to shield clients from the effects of poor (especially wireless) networks (Fox Brewer 1996, Liljeberg, M. et al. 1996) perform filtering (Zenel 1996) and anonymization, and perform value added transformations on content, including Kanji transcoding (Sato 1994), Kanji to GIF conversion (Yee 1995) application level stream transducers (Brooks, Mazer, Meeks Miller 1995) and personalized agent services for Web browsing (Barrett, Maglio Kellem 1995) Infrastructure proxies have also been used as a mechanism for application partitioning, as in the Wit ....

Sato, Y. (1994), `DeleGate Server'. http://wall.etl.go.jp/delegate/.

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