In the US in particular, there is an increasing emphasis on the importance of science in education. To better understand a scientific topic, students need to compile information from multiple sources and determine the principal causal factors involved. We describe an approach for automatically inferring the quality and completeness of causal reasoning in essays on two separate scientific topics...

Distributed Object Systems are known to be very complex. Consequently it is very difficult, if not impossible, to see the overall relationship among participating objects in the system. That complicates the issues connected with performance tuning and maintenance. An economical way to visualize the system is clearly needed. In this paper, we propose a tracing facility for Java-based distributed...

Most concurrency control algorithms for multilevel secure databases based on kernelized architecture prevent covert channels between transactions at different security levels by preempting the high security transaction in the event of a data conflict with a lower security transaction. In environments with moderate to high levels of contention between low and high security transactions, this can...

Based on the current studies on the algorithms of the affinity propagation and normalized cut, a new scalable graph clustering method called APANC (Affinity Propagation And Normalized Cut) is proposed in this paper. During the APANC process, we firstly use the “Affinity Propagation” (AP) to preliminarily group the original data in order to reduce the data-scale, and then we further group the re...

When spatial objects are replicated at several sites in the network, the updates of a long transaction in a specific site should be propagated to the other sites for maintaining the consistency of replicated spatial objects. If any two or more transactions at different sites concurrently update some spatial objects within a given region, two spatial objects having spatial relationships should b...

This paper considers the problem of estimating the population mean Y of the study variate y with two auxiliary variates x and z in the presence of non-response using twophase (double) sampling procedure. Four classes of combined regression and ratio estimators have been defined in four different situations and their properties are studied under large sample approximation. Comparisons of the sug...

Abstract. This paper approaches the problem of synthesising an asynchronous control circuit for a stage of the Sproull Counterflow pipeline processor (CFPP) as an exercise in exploiting formal techniques available for Petri nets. We first synthesise a Petri net model of the CFPP stage control from its original “five-state-five-event” description due to Charles Molnar. Secondly, we implement tha...

We recently discovered 5 new putative globally optimum configurations for Morse clusters at ρ = 8. This report contains the main algorithmic details as well as the structure determined with our method. Methodology After the success obtained in solving minimum energy conformation problems for Lennard-Jones clusters (see [LS02] and [LS03]) we recently adapted our twophase monotonic basin-hopping ...

This study addresses the problem of finding the range of efficiency for each Decision Making Unit (DMU) considering uncertain data. Uncertainty in the DMU coefficients in each factor (input or output) is captured through interval coefficients (i.e., these are uncertain but bounded). A twophase additive Data Envelopment Analysis (DEA) model for performance evaluation is used, which is adapted to...