Distributed database directory refresh strategies, commonly recommended for the X.500 standard, are defined and analytically modeled for variations on push/pull and total/differential under idealistic asynchronous control conditions. The models are implemented in a HyperCard-based tool called DirMod (for “directory model”). Experimental test results show important elapsed time performance trade...

1 Faculdade de Educação Física e Dança, Universidade Federal de Goiás, Goiania, Brazil, 2 Laboratório de Pesquisas em Desempenho Humano, Universidade de Pernambuco-Campus Petrolina, Petrolina, Brazil, Departamento de Educação Física, Universidade Federal do Rio Grande do Norte, Natal, Brazil, 4 Institute of Sport Science, University of Koblenz-Landau, Landau, Germany, Department of Biomedical S...

This paper examines some aspects of the security services in the CCITT Draft 1988 X.400 Recommendations for Message Handling Systems. A brief introduction to relevant cryptographic concepts is followed by a description of how some of the security services may be provided. Key management, as defined within the CCITT Draft X.500 Recommendations for Directory Services, and as referenced by the X.4...

This is a discussion paper on Index DSAs, which are advanced as part of a more service-oriented approach to using X.500. The paper argues that Index DSAs are needed to provide key services which cannot be provided by simply using the existing X.500 infrastructure. Some of the problems with the use of strict X.500 techniques are then discussed. An alternative approach is proposed using X.500 ser...

'Extra-welfarism' has received some attention in health economics, yet there is little consensus on what distinguishes it from more conventional 'welfarist economics'. In this paper, we seek to identify the characteristics of each in order to make a systematic comparison of the ways in which they evaluate alternative social states. The focus, though this is not intended to be exclusive, is on h...

[This corrects the article on p. 755 in vol. 8, PMID: 29163152.].

Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.