280 research outputs found
Modal Tableaux for Verifying Security Protocols
To develop theories to specify and reason about various aspects of multi-agent systems, many researchers have proposed the use of modal logics such as belief logics, logics of knowledge, and logics of norms. As multi-agent systems operate in dynamic environments, there is also a need to model the evolution of multi-agent systems through time. In order to introduce a temporal dimension to a belief logic, we combine it with a linear-time temporal logic using a powerful technique called fibring for combining logics. We describe a labelled modal tableaux system for a fibred belief logic (FL) which can be used to automatically verify correctness of inter-agent stream authentication protocols. With the resulting fibred belief logic and its associated modal tableaux, one is able to build theories of trust for the description of, and reasoning about, multi-agent systems operating in dynamic environments
Modal tableaux for verifying stream authentication protocols
To develop theories to specify and reason about various aspects of multi-agent systems, many researchers have proposed the use of modal logics such as belief logics, logics of knowledge, and logics of norms. As multi-agent systems operate in dynamic environments, there is also a need to model the evolution of multi-agent systems through time. In order to introduce a temporal dimension to a belief logic, we combine it with a linear-time temporal logic using a powerful technique called fibring for combining logics. We describe a labelled modal tableaux system for the resulting fibred belief logic (FL) which can be used to automatically verify correctness of inter-agent stream authentication protocols. With the resulting fibred belief logic and its associated modal tableaux, one is able to build theories of trust for the description of, and reasoning about, multi-agent systems operating in dynamic environments
Iterated Belief Change and the Levi Identity
Most works on iterated belief change have focussed on iterated belief revision, namely, on how to compute (K star x) star y. However, historically, belief revision has been defined in terms of belief expansion and belief contraction that have been viewed as primary operations. Accordingly, what we should be looking at are constructions like: (K+x)+y, (K-x)+y, (K-x)+y and (K-x)-y. The first two constructions are relatively innocuous. The last two are, however, more problematic. We look at these sequential operations. In the process, we use the Levi Identity as the guiding principle behind state changes (as opposed to belief set changes)
Enabling the Analysis of Personality Aspects in Recommender Systems
Existing Recommender Systems mainly focus on exploiting users’ feedback, e.g., ratings, and reviews on common items to detect similar users. Thus, they might fail when there are no common items of interest among users. We call this problem the Data Sparsity With no Feedback on Common Items (DSW-n-FCI). Personality-based recommender systems have shown a great success to identify similar users based on their personality types. However, there are only a few personality-based recommender systems in the literature which either discover personality explicitly through filling a questionnaire that is a tedious task, or neglect the impact of users’ personal interests and level of knowledge, as a key factor to increase recommendations’ acceptance. Differently, we identifying users’ personality type implicitly with no burden on users and incorporate it along with users’ personal interests and their level of knowledge. Experimental results on a real-world dataset demonstrate the effectiveness of our model, especially in DSW-n-FCI situations
UniMOS: A Universal Framework For Multi-Organ Segmentation Over Label-Constrained Datasets
Machine learning models for medical images can help physicians diagnose and
manage diseases. However, due to the fact that medical image annotation
requires a great deal of manpower and expertise, as well as the fact that
clinical departments perform image annotation based on task orientation, there
is the problem of having fewer medical image annotation data with more
unlabeled data and having many datasets that annotate only a single organ. In
this paper, we present UniMOS, the first universal framework for achieving the
utilization of fully and partially labeled images as well as unlabeled images.
Specifically, we construct a Multi-Organ Segmentation (MOS) module over
fully/partially labeled data as the basenet and designed a new target adaptive
loss. Furthermore, we incorporate a semi-supervised training module that
combines consistent regularization and pseudolabeling techniques on unlabeled
data, which significantly improves the segmentation of unlabeled data.
Experiments show that the framework exhibits excellent performance in several
medical image segmentation tasks compared to other advanced methods, and also
significantly improves data utilization and reduces annotation cost. Code and
models are available at: https://github.com/lw8807001/UniMOS.Comment: Accepted by BIBM202
Fundamental Issues in Mobile Healthcare Information Systems
Fundamental Issues in Mobile Healthcare Information System
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