Search (21 results, page 1 of 2)

  • × theme_ss:"Datenfernübertragung"
  1. Hinich, M.J.; Molyneux, R.E.: Predicting information flows in network traffic (2003) 0.02 
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    Abstract
    Hinich and Molyneux review the literature of internet measurement and note three results consistently to be found in network traffic studies. These are "self-similarity," "long-range dependence," by which is meant that events in one time are correlated with events in a previous time and remain so through longer time periods than expected, and "heavy tails" by which they mean many small connections with low byte counts and a few long connections with large byte counts. The literature also suggests that conventional time series analysis is not helpful for network analysis. Using a single day's traffic at the Berkeley National Labs web server, cumulated TCP flows were collected, log transforms were used with the adding of .01 to all values allowing log transforms of the zero values, and providing a distribution that overcomes the heavy tail problem. However, Hinich's bicorrelation test for nonlinearity using overlapping moving windows found strong evidence of nonlinear structures. Time series analysis assumes linear systems theory and thus additivity and scalability. Spectral analysis should provide large peaks at the lowest frequencies if long range dependence is present since the power spectrum would go to infinity if the frequency goes to zero. This does not occur and so long range dependence must be questioned, at least until it is determined what effect other OSI layers may have on the TCP data.
  2. Petry, W.; Werner, H.-J.: Anwendertraum: Kommunikations- und Retrieval-Software im Vergleich (1993) 0.01 
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    Source
    Cogito. 9(1993) H.2, S.18-22
  3. Petry, W.: Datenreisen billiger : wie man Telekommunikationskosten sparen kann (1994) 0.01 
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    Source
    Cogito. 10(1994) H.4, S.17-22
  4. Matthews, J.R.; Parker, M.R.: Local Area Networks and Wide Area Networks for libraries (1995) 0.01 
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    Date
    30.11.1995 20:53:22
  5. Scheuerer, J.: Onlinebanking (1997) 0.01 
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    Source
    Com!. 1997, H.8, S.22-24
  6. Berezak-Lazarus, N.: ADSL - Auf der Überholspur durch die Multimedia-Welt (1999) 0.01 
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    Footnote
    Rez. in: Internet Professionell 2000, H.2, S.22
  7. Cerf, V.G.: Netztechnik (1995) 0.01 
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    Pages
    S.22-31
  8. Duhm, U.: Ring frei zur nächsten Runde (1999) 0.01 
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    Date
    19. 2.1999 20:21:22
  9. Lynch, C.A.: ¬The Z39.50 information retrieval standard : part I: a strategic view of its past, present and future (1997) 0.01 
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    Abstract
    This paper, which will appear in two parts, starting with this issue of D-Lib, looks at several strategic issues surrounding Z39.50. After a relatively brief overview of the function and history of the protocol, I will examine some of the competing visions of the protocol's role, with emphasis on issues of interoperability and the incorporation of semantics. The second installment of the paper will look at questions related to the management of the standard and the standards development process, with emphasis on the scope of the protocol and how that relates back again to interoperability questions. The paper concludes with a discussion of the adoption and deployment of the standard, its relationship to other standards, and some speculations on future directions for the protocol. This paper is not intended to be a tutorial on the details of how current or past versions of Z39.50 work. These technical details are covered not only in the standard itself (which can admittedly be rather difficult reading) but also in an array of tutorial and review papers (see <http://lcweb.loc.gov/z3950/agency> for bibliographies and pointers to on-line information on Z39.50). Instead, the paper's focus is on how and why Z39.50 developed the way it did, and the conceptual debates that have influenced its evolution and use. While a detailed technical knowledge of the operation of Z39.50 is certainly helpful, it should not be necessary in order to follow most of the material here. Some disclaimers are in order. I have been actively involved in the development of Z39.50 since the early 1980s and have been a participant -- and on occasion, even an instigator -- of some of the activities described here. This paper is an attempt to make a critical assessment of the current state of Z39.50 and a review of its development with the full benefit of hindsight. It recounts a number of debates that occurred within the developer community over the past years. In many of these, I advocated specific positions or approaches, sometimes successfully and sometimes unsuccessfully. What is presented here is one person's perspective - mine --, which is sometimes at odds with the current consensus with the developer community; I've tried to represent opposing views fairly, and to differentiate my opinions from fact or consensus. However, others will undoubtedly disagree with many of the comments here.
  10. Sloan, B.G.: Remote access : design implications for the online catalog (1991) 0.01 
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    Date
    8. 1.2007 17:22:42
  11. Lazinger, S.S.; Peritz, B.C.: Reader use of a nationwide research library network : local OPAC vs. remote files (1991) 0.00 
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    Date
    22. 2.1999 13:06:18
  12. Phifer, L.A.: Tearing down the wall : integrating ISO and Internet management (1994) 0.00 
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    Abstract
    The rapid growth of the Internet TCP/IP networks has encouraged the deployment of management products based on the Internet's Simple Network Management Protocol (SNMP). However, many organizations, including most telecommunications service providers, continue to define enterprise management solutions based on ISO/CCITT standard management and underlying Common Management Information Protocol (CMIP). Concludes that the key to achieving timely, effective, integrated management is to encourage a transition process aimed away from existing commercial investment in both ISO/CCITT and Internet based management technologies through deployment of common methods and tools which support integration
  13. Reiss, L.K.; Merakos, L.F.: Performance analysis of an adaptive bandwidth reservation scheme for ATM virtual path traffic (1996) 0.00 
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    Abstract
    Adaptive, in-call, bandwidth reservation may be used to enhance bandwidth utilization in a policed asynchronous transfer mode (ATM) virtual path shared by traffic streams originated by many bursty sources. Presents a model, based on Markov-modulated sources and stochastic fluid methods, for performance analysis of the proposed mechanism. The model, corroborated by simulations, is used to study achievable bandwidth gain and the effects of feedback delay and competing reservation processes
  14. Boßmeyer, C.: OSI-Anwendungen in Bibliotheken oder Was ein Bibliothekar von OSI wissen sollte (1995) 0.00 
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    Abstract
    Open System Interconnection (OSI) Standard 7498 appeared in 1984. Open systems of PCs and workstations decentralize information processing and divide it between several computers, based on the client-server concept. Relevant terminology is explained, including application protocol, bases of the SR/Z39.50 model, data transmission, search request services, query types, attribute sets, transmission format, transfer syntax, solution models and cooperation between library systems
  15. Poo, G.-S.; Chai, B.-P.: Modularity versus efficiency in OSI system implementations (1997) 0.00 
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    Abstract
    Examines a number of possible OSI system implementation strategies based on the various prevailing system facilities: processes, threads, kernel and front-end processors. Analyzes the pros and cons of the strategies showing their relative merits in implementation. The analysis leads to the recommendation of an enhanced subsystem architecture that holds the best compromise of the conflicting requirements of modularity and efficiency
  16. Holm, L.A.: Connectivity and protocols, the technical side : OSI and TCP/IP, FTP, TELNET, SR, ILL, update (1994) 0.00 
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    Abstract
    Describes a layer model for networks. For each layer, one or more services are defined, and for each service a protocol is specified. 2 OSI application level protocols have been defined for library services: SR and ILL. The underlying layers are supposed to be OSI services, but some implementations are using TCP/IP, and some are using a mixture of OSI and TCP/IP. The systems based directly on TCP/IP can not communicate with those based purely on OSI. Discusses the pros and cons for choosing OSI or TCP/IP. Gateways between the OSI and TCP/IP networks are needed. The ISO protocol SR and the ANSI protocol Z39.50 are both 'search and retrieve' protocols. The SR is almost a subst of Z39.50, but they may become identical in the future. There is only one protocol for interlibrary loan, the ISO ILL protocol. It covers 3 models of interlibrary loan and all services connected with ILL. Other services such as Explain, Scan and Update are presently being discussed in ISO TC 46. Discusses the needs of the library community for network services such as file transfer, remote login, directories and electronic mail
  17. Buxton, A.B.: International gateways (1991) 0.00 
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    Abstract
    Describes types of international gateways available for online searching. Public data networks are provided by national telecommunications authorities. Private data networks are run by an organization for its own use, or for customers of its services. Academic data networks are a special case of private networks which serve the the academic and research communications. Gives details of a number of academic networks: JANET, BITNET, NETNORTH, EARN, Internet. Describes the gateways between JANET and the UK public data network, EARN and Internet. Describes the international X.25 infrastructure (IXI) network which is organized by COSINE (Cooperation for OSI networking in Europe) programme which aims to provide OSI-based services for European researchers
  18. Pospischil, R.: ¬A bypass for the local loop : Deutsche Telekom's strategy for fiber to the home (1995) 0.00 
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    Abstract
    Technological and regulatory developments are opening the door for competition and new services in the local loop. The reunification of Germany created an opprotunity for Deutsche Telekom to install fibre in the loop on a large scale in eastern Germany. Deutsche Telekom's strategy consists of 4 steps: fibre in the loop is seen as a process innovation. New broadband services - product innovations - can be based on the process innovation. Only a sufficient number of installations will enable the industry to invest in new products. Besides the local networks equipped with fibre, there is an overlay network for the rapid delivery of fibre access for business customers. The experience gained in eastern Germany will be transferred to western Germany when tranforming its existing network structure
  19. Maier-Rabler, U.: Austrian information highway initiatives in the stage of disillusionment (1996) 0.00 
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    Abstract
    Discusses Austrian government policy on the information superhighway (ISH) since Aug. 94. The Austrian telecommunications infrastructure is far behind the standards of Europe. The Austrain PTT monopoly over the public telecommunications network is an obstacle to development. The rates for data services are still based on copper cable with transmission speeds of 9600 Kbps. Although there are various ISH initiatives in Austria, the gap between vision and reality is large. Describes the initiatives of the Austrian National Host and the Bureau for International Research and Technology Cooperation; the Austrian Platform for Telematic Applications; BNet (Burgenland); Telematik Initiative Wien; TELKIS Telekommunikationsinitiative Steiermark; Datahighway Upper Austria; Vorarlberger Telekommunikations GmbH; Telematik Initiative; Datenbahn Telecom GmbH (Salzburg); Ti-KOM (Tirol) and other initiatives
  20. Lucas, T.A.: Time patterns in remote OPAC use (1993) 0.00 
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    Abstract
    Expanded hours of access and the reduction of peak system loads are often cited as advantages of remote access to OPACs. This argument is based on the assumption that remote users search OPACs when libraries are closed or when there is low internal use. The study tested this assumption by performing a transactional log analysis of the remote and internal use of the OPAC at the Research Libraries of the New York Public Library. Analysis showed that pateerns of remote and internal use differed greatly. A large part of the remote searching occured when the Research Libraries were closed. Compared to internal searching, remote searching was distributed more evenly over the course of the day and the week. Results show that remote access expands the hours of use of the Online catalogue and has potential to reduce peak system loads at the Research Libraries

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  • e 14
  • d 7

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