769 research outputs found
SERKET: An Architecture for Connecting Stochastic Models to Realize a Large-Scale Cognitive Model
To realize human-like robot intelligence, a large-scale cognitive
architecture is required for robots to understand the environment through a
variety of sensors with which they are equipped. In this paper, we propose a
novel framework named Serket that enables the construction of a large-scale
generative model and its inference easily by connecting sub-modules to allow
the robots to acquire various capabilities through interaction with their
environments and others. We consider that large-scale cognitive models can be
constructed by connecting smaller fundamental models hierarchically while
maintaining their programmatic independence. Moreover, connected modules are
dependent on each other, and parameters are required to be optimized as a
whole. Conventionally, the equations for parameter estimation have to be
derived and implemented depending on the models. However, it becomes harder to
derive and implement those of a larger scale model. To solve these problems, in
this paper, we propose a method for parameter estimation by communicating the
minimal parameters between various modules while maintaining their programmatic
independence. Therefore, Serket makes it easy to construct large-scale models
and estimate their parameters via the connection of modules. Experimental
results demonstrated that the model can be constructed by connecting modules,
the parameters can be optimized as a whole, and they are comparable with the
original models that we have proposed
A solution for secure use of Kibana and Elasticsearch in multi-user environment
Monitoring is indispensable to check status, activities, or resource usage of
IT services. A combination of Kibana and Elasticsearch is used for monitoring
in many places such as KEK, CC-IN2P3, CERN, and also non-HEP communities.
Kibana provides a web interface for rich visualization, and Elasticsearch is a
scalable distributed search engine. However, these tools do not support
authentication and authorization features by default. In the case of single
Kibana and Elasticsearch services shared among many users, any user who can
access Kibana can retrieve other's information from Elasticsearch. In
multi-user environment, in order to protect own data from others or share part
of data among a group, fine-grained access control is necessary.
The CERN cloud service group had provided cloud utilization dashboard to each
user by Elasticsearch and Kibana. They had deployed a homemade Elasticsearch
plugin to restrict data access based on a user authenticated by the CERN Single
Sign On system. It enabled each user to have a separated Kibana dashboard for
cloud usage, and the user could not access to other's one. Based on the
solution, we propose an alternative one which enables user/group based
Elasticsearch access control and Kibana objects separation. It is more flexible
and can be applied to not only the cloud service but also the other various
situations. We confirmed our solution works fine in CC-IN2P3. Moreover, a
pre-production platform for CC-IN2P3 has been under construction.
We will describe our solution for the secure use of Kibana and Elasticsearch
including integration of Kerberos authentication, development of a Kibana
plugin which allows Kibana objects to be separated based on user/group, and
contribution to Search Guard which is an Elasticsearch plugin enabling
user/group based access control. We will also describe the effect on
performance from using Search Guard.Comment: International Symposium on Grids and Clouds 2017 (ISGC 2017
Symbol Emergence in Robotics: A Survey
Humans can learn the use of language through physical interaction with their
environment and semiotic communication with other people. It is very important
to obtain a computational understanding of how humans can form a symbol system
and obtain semiotic skills through their autonomous mental development.
Recently, many studies have been conducted on the construction of robotic
systems and machine-learning methods that can learn the use of language through
embodied multimodal interaction with their environment and other systems.
Understanding human social interactions and developing a robot that can
smoothly communicate with human users in the long term, requires an
understanding of the dynamics of symbol systems and is crucially important. The
embodied cognition and social interaction of participants gradually change a
symbol system in a constructive manner. In this paper, we introduce a field of
research called symbol emergence in robotics (SER). SER is a constructive
approach towards an emergent symbol system. The emergent symbol system is
socially self-organized through both semiotic communications and physical
interactions with autonomous cognitive developmental agents, i.e., humans and
developmental robots. Specifically, we describe some state-of-art research
topics concerning SER, e.g., multimodal categorization, word discovery, and a
double articulation analysis, that enable a robot to obtain words and their
embodied meanings from raw sensory--motor information, including visual
information, haptic information, auditory information, and acoustic speech
signals, in a totally unsupervised manner. Finally, we suggest future
directions of research in SER.Comment: submitted to Advanced Robotic
Control as Probabilistic Inference as an Emergent Communication Mechanism in Multi-Agent Reinforcement Learning
This paper proposes a generative probabilistic model integrating emergent
communication and multi-agent reinforcement learning. The agents plan their
actions by probabilistic inference, called control as inference, and
communicate using messages that are latent variables and estimated based on the
planned actions. Through these messages, each agent can send information about
its actions and know information about the actions of another agent. Therefore,
the agents change their actions according to the estimated messages to achieve
cooperative tasks. This inference of messages can be considered as
communication, and this procedure can be formulated by the Metropolis-Hasting
naming game. Through experiments in the grid world environment, we show that
the proposed PGM can infer meaningful messages to achieve the cooperative task
Induction of Ptp2 and Cmp2 protein phosphatases is crucial for the adaptive response to ER stress in Saccharomyces cerevisiae
Expression control of the protein phosphatase is critically involved in crosstalk and feedback of the cellular signaling. In the budding yeast ER stress response, multiple signaling pathways are activated and play key roles in adaptive reactions. However, it remains unclear how the expression level of the protein phosphatase is modulated during ER stress response. Here, we show that ER stress increases expression of Ptp2 tyrosine phosphatase and Cmp2 calcineurin phosphatase. Upregulation of Ptp2 is due to transcriptional activation mediated by Mpk1 MAP kinase and Rlm1 transcription factor. This induction is important for Ptp2 to effectively downregulate the activity of Hog1 MAP kinase. The budding yeast genome possesses two genes, CMP2 and CNA1, encoding the catalytic subunit of calcineurin phosphatase. CMP2 is more important than CNA1 not only in ER stress response, but also in salt stress response. Higher promoter activity of CMP2 contributes to its relative functional significance in ER stress response, but is less important for salt stress response. Thus, our results suggest that expression control of Ptp2 and Cmp2 protein phosphatases at the promoter level is crucial for adaptive responses to ER stress
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