Due to its salient properties, mobile agent technology has received rapidly growing attention over the last few years. Many developments ofmobile agent systems are under way in both academic and industrial environments. MOLE is one of the first mobile agent systems that has been developed in the Java language; the first version came out in 1995. Since then MOLE has been constantly improved, and provides a stable environment for development and usage of mobile agents in the area of distributed applications. Furthermore, it has been used extensively in our research at the University of Stuttgart. In this paper we describe the system MOLE, some of its unique concepts and their implementation, and the results of our research in the areas of security, transactional support, and control mechanisms. Additionally, we discuss some applications built on MOLE. Copyright © 2002 John Wiley & Sons, Ltd.
Bryomol carbonates, composed of bryozoans and molluscs, are found in non-tropical shelf and upper slope settings where they are sensitive indicators of oceanographic conditions. Few modern bryomol carbonate settings have been investigated to date, despite their importance in the Phanerozoic rock record. Furthermore, no detailed facies mapping and long-term oceanographic observations have been undertaken in modern bryomol settings, even though this is important for accurately interpreting facies, climate and oceanography from fossil bryomol carbonates. A bryomol carbonate factory on the western margin of the northern Gulf of California, Mexico was selected for an integrated high-resolution in situ oceanographic monitoring, acoustic seafloor mapping, sediment and bryozoan growth morphology study. Molluscan- (28%), bryozoan- (25%) and barnacle- (14%) dominated carbonate production takes place under normal saline warm-temperate eutrophic conditions, with average near sea surface temperatures of 20°C. Even though temperatures are unusually warm for the formation of bryomol carbonates, they develop as a result of prevailing eutrophic conditions (average chlorophyll-a contents of 2.2 mg chl-a m−3). Eutrophic conditions provide ample food to heterotrophic calcifiers and largely exclude faster-growing phototrophic organisms by drastically restricting the depth of the euphotic zone and, therefore, water clarity. Thus, the presence of high amounts of nutrients can generate cool-water-type carbonate assemblages at temperatures where a warm-water association would be expected.
Abstract. Driven by the question how to identify potential communication partners and the need for well-suited communication schemes in agent-based systems, we discuss two communication concepts: sessions and global event management.Sessions establish either actively or passively a context for inter-agent interactions. Communication partners are addressed by globally unique agent identifiers or via badges. Communication in sessions is based on RPC or message mechanisms.Global event management addresses the need for anonymous communication. Event managers are employed as a synchronization means within agent groups. Based on this approach, we introduce synchronization objects, -active components that offer various synchronization services. The presented model is finally mapped onto OMG event services.
Abstract. It is widely agreed that mobile agents in conjunction with WWW technology will provide the technical foundation for future electronic commerce. A prerequisite for the use of mobile agents in a commercial environment is, that agents have to be executed reliable, independent of communication and node failure.In this paper, we first present a recently proposed fault-tolerant protocol to ensure the exactly-once execution of an agent by monitoring the agents execution. With this protocol, agents are performed in so-called stages. Each stage consists of a number of nodes. One of these nodes executes the agent while the other nodes monitor the execution.The main focus of this paper is the construction of stages. In particular, we will investigate how the number of nodes per stage influence the probability of an agent to be blocked due to failures and which nodes should be selected when forming a stage to minimize the overhead caused by the protocol. Also a flexible itinerary concept is proposed that gives agent systems the freedom to do various kinds of optimizations when determining the next node and constructing a stage.
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