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Sökning: swepub > Rapport > Fritt online > (1985-1989) > (1989)

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1.
  • Alm, Håkan (författare)
  • Representation of large-scale environments
  • 1989
  • Rapport (övrigt vetenskapligt)abstract
    • The purpose of this report is to, through a literature study, shed some light on peoples’ representation of large-scale environments. This knowledge will make it possible to adapt the information from a navigation or route guidance-system to the drivers representation of the environment. In other words, if one knows how drivers are thinking about their environment, then it is possible to provide them with information that they understand and can use effectively during navigation.Before considering the question of how people represent large-scale environments it seems necessary to briefly analyse the task of navigation. The reason is that the navigation task will, to some extent, determine what type of information a driver needs from the environment.
2.
  • Grönlund, Anders (författare)
  • HF-limning av lamellkonstruktioner
  • 1989
  • Rapport (övrigt vetenskapligt)abstract
    • Genom att studera vad som påverkar HF-limning har vi kunnat fastställa ett antal faktorer som ökar processäkerheten. Dessutom har ett par olika metoder för icke förstörande limfogskontroll undersökts.
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6.
  • Ahlgren, Bengt, et al. (författare)
  • SPION: Secure Protocols in OSI Networks
  • 1989
  • Rapport (övrigt vetenskapligt)abstract
    • SPION: Secure Protocols in OSI Networks This report describes how security services can be realized in a computer network using the protocols of the Open Systems Interconnection (OSI) reference model for communication. The report starts with defining security requirements for a "typical" local area network in a company, university or similar organization. It is assumed that the organization does not use the network for transfer of extremely sensitive information, such as military secrets. A set of security services, as specified in the OSI security architecture, are selected in order to satisfy the requirements. The selected services are then placed in suitable layers of the OSI model according to the criteria in the security architecture, and to the taste of the authors. The report concentrates on the transport layer. An extension of the OSI transport protocol, class 4, including security services is described in detail. The protocol is a fully compatible extension of the standard transport protocol. Key management is another topic which is included in the report. A key management system for handling public keys and digital signatures based on an article by Dorothy E. Denning is described. The system includes functions for distributing and validating public keys, and registering and later verifying digital signatures. A key management protocol supporting these functions is defined for communication between ordinary open systems and special key server systems.
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8.
  • Anderson, Kym (författare)
  • Rent-Seeking and Price-Distorting Policies in Rich and Poor Countries
  • 1989
  • Rapport (övrigt vetenskapligt)abstract
    • Who do rich countries tend to subsidize agricultural production more than industrial production and to effectively tax food consumption, while poor countries tend to protect industrial producers and food consumers at the expense of farmers? This paper uses a computable general equilibrium model and representative parameters to demonstrate that the income distributional effects of those two different patterns of price distortions are such that on a per capita basis the losers lose little relative to the benefits to gainers. When coupled with determinants of the relative efficiency of different groups in pressuring policy-makers and influencing social preferences, such as the costs of information and collective action, it becomes less puzzling as to why we so often observe these policy regimes.
9.
  • Andersson, Jerker, et al. (författare)
  • On the usage of knowledge based techniques in configuring computer systems: a case study
  • 1989
  • Rapport (övrigt vetenskapligt)abstract
    • The aim of the thesis has been to define the domains of control structure specification and process station configuration in order to find a general approach applicable to problems concerning the configuration of a process control system or any similar system. These findings are then used as the foundation for constructing a knowledge based system capable of realizing a problem solving method pertaining to the domain of configuring a specific computer system.
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