scholarly journals Evolution of Implicit and Explicit Communication in Mobile Robots

2009 ◽  
pp. 179-214 ◽  
Author(s):  
Joachim de Greeff ◽  
Stefano Nolfi
Keyword(s):  
Mobile Robots ◽  
Implicit And Explicit ◽  
Explicit Communication

Navigation of non-communicating autonomous mobile robots with guaranteed connectivity

Robotica ◽  
2013 ◽  
Vol 31 (5) ◽  
pp. 767-776 ◽  
Author(s):  
Ahmet Cezayirli ◽  
Feza Kerestecioğlu
Keyword(s):  
Mobile Robots ◽  
Measurement Errors ◽  
Real Life ◽  
Autonomous Mobile Robots ◽  
Optimal Solutions ◽  
Position Measurement ◽  
Position Information ◽  
Computational Burden ◽  
Group Connectivity ◽  
Explicit Communication

SUMMARYWe consider the connectivity of autonomous mobile robots. The robots navigate using simple local steering rules without requiring explicit communication among themselves. We show that using only position information of neighbors, the group connectivity can be sustained even in the case of bounded position measurement errors and the occlusion of robots by other robots in the group. In implementing the proposed scheme, sub-optimal solutions are invoked to avoid an excessive computational burden. We also discuss the possibility of deadlock which may bring the group to a standstill and show that the proposed methodology avoids such a scenario in real-life settings.

scholarly journals Validating a methodology for understanding pedestrian - vehicle interactions: A comparison of video and field observations

2021 ◽  
Author(s):  
Ruth Madigan ◽  
Yee Mun Lee ◽  
Natasha Merat
Keyword(s):  
Detailed Examination ◽  
Field Observations ◽  
Systematic Observation ◽  
Communication Techniques ◽  
Road Users ◽  
Observation Protocol ◽  
Implicit And Explicit ◽  
Vehicle Movement ◽  
Exact Sequences ◽  
Explicit Communication

The successful deployment of automated vehicles (AVs) will depend on their capacity to travel within a mixed traffic environment, adopting appropriate interaction strategies across different scenarios. Thus, it is important to gain a detailed understanding of the specific types of interactions that are most likely to arise. The overall purpose of this paper was to present a methodology designed to facilitate the systematic observation of pedestrian-vehicle interactions, and to validate its use for both onsite and video based observations. A detailed observation protocol was developed to capture pedestrian and vehicle movement and communication patterns across four interaction phases. Onsite coders completed field observations of 50 pedestrian-vehicle interactions at a UK intersection, while video coders observed the same interactions recorded through a wireless camera mounted on a nearby rooftop. Results show that the observation protocol provides a reliable methodology for capturing patterns of pedestrian-vehicle interactions, with high levels of inter-coder consistency emerging across all categories of codes. A detailed examination of the specific descriptors selected suggests that onsite coding may be particularly beneficial in situations where the aim is to capture any explicit, and perhaps subtle, communication cues, whereas video based coding may be more appropriate in situations where exact sequences of behaviours or measurements of timings are desired. It is anticipated that this type of observation tool will be beneficial for AV developers to increase their understanding of how to interpret the movements of road users, along with increasing knowledge of when implicit and explicit communication techniques should be used.

Explicit Communication Among Stigmergic Robots

2019 ◽  
Vol 30 (02) ◽  
pp. 315-332 ◽  
Author(s):  
Yoann Dieudonné ◽  
Shlomi Dolev ◽  
Franck Petit ◽  
Michael Segal
Keyword(s):  
Mobile Robots ◽  
Distributed Algorithms ◽  
Communication Protocols ◽  
Exchange Of Information ◽  
Sense Of Direction ◽  
Synchronous Systems ◽  
Communication Devices ◽  
One To One ◽  
Explicit Communication ◽  
The Way

In this paper, we investigate avenues for the exchange of information (explicit communication) among deaf and mute mobile robots scattered in the plane. We introduce the use of movement-signals (analogously to flight signals and bees waggle) as a mean to transfer messages, enabling the use of distributed algorithms among robots. We propose one-to-one deterministic movement protocols that implement explicit communication among semi-synchronous robots. We first show how the movements of robots can provide implicit acknowledgment in semi-synchronous systems. We use this result to design one-to-one communication among a pair of robots. Then, we propose two one-to-one communication protocols for any system of [Formula: see text] robots. The former works for robots equipped with observable IDs that agree on a common direction (sense of direction). The latter enables one-to-one communication assuming robots devoid of any observable IDs or sense of direction. All protocols (for either two or any number of robots) assume that no robot remains inactive forever. However, they cannot avoid that the robots move either away or closer to each others, by the way requiring robots with an infinite visibility. In this paper, we also present how to overcome these two disadvantages (some activity of every robot and infinite visibility). Our protocols enable the use of distributing algorithms based on message exchanges among swarms of stigmergic robots. They also allow robots to be equipped with the means of communication to tolerate faults in their communication devices.

Impliciete en expliciete communicatiestrategieën tijdens organisatieveranderingen

2011 ◽  
Vol 39 (4) ◽  
Author(s):  
Anna Wamsteeker ◽  
Mark van Vuuren
Keyword(s):  
Organizational Change ◽  
Public Sector ◽  
Communication Strategies ◽  
Communication Strategy ◽  
Service Center ◽  
The Public ◽  
Shared Service ◽  
Implicit And Explicit ◽  
Explicit Communication

Implicit and explicit communication strategies during organizational change: a case study on a shared service center implementation within the public sector Implicit and explicit communication strategies during organizational change: a case study on a shared service center implementation within the public sector In this case study, we used the Organizational Stakeholder Model of Change Implementation Communication (Lewis, 2007) to evaluate the communication strategy used during the implementation of a Shared Service Center in a large governmental agency. The model proves to be useful for describing the strategic choices made by the project managers. Most of the dimensions were recognizable in the communication efforts, even though most of these choices were made implicitly. Interestingly, several stakeholders disagreed with the project management team about the identification of the strategy. They experienced the communication efforts negatively rather than balanced or positive. The results show the complexity of communication during change and the ways people make sense of these dynamic processes. The strategy dimensions can be useful guides when managing complex changes like the implementation of a Shared Service Center.

Division of Iterative-Transportation Based on State Estimation Using Local Observation

2012 ◽  
Vol 433-440 ◽  
pp. 5004-5011
Author(s):  
Yuta Sato ◽  
Yuichi Kobayashi ◽  
Manabu Gouko
Keyword(s):  
Mobile Robots ◽  
State Estimation ◽  
Division Of Labor ◽  
Control Law ◽  
Total Efficiency ◽  
Global Information ◽  
Multiple Robots ◽  
Local Observation ◽  
Excessive Number ◽  
Explicit Communication

This paper deals with a framework of decentralized approach to division of labor by multiple mobile robots. An iterative-transportation task by multiple robots with multiple sets of starts (pick-up place of the object) and goals (put down place) is considered as the task. On each route between a start and a goal, the efficiency of transportation improves when the number of robots increases. Due to jams, however, excessive number of robots on the same route causes inefficiency. We propose a control law of each robot to choose an appropriate route so as to optimize the total efficiency of the transportation, where each robot utilizes information which can be obtained only by local observation (without any explicit communication among robots). The proposed control is based on the estimation of the number of robots on the routes in the future by using EXPAR model. In simulation, it was verified that the proposed control law realized the similar level of the efficiency by appropriately choosing the route, compared with the case where global information can be utilized.

Division of Iterative-Transportation Based on Local Observation by Multiple Mobile Robots

2012 ◽  
Vol 16 (3) ◽  
pp. 462-468
Author(s):  
Yuichi Kobayashi ◽  
◽  
Yuta Sato ◽  
Manabu Gouko ◽  
◽  
...  
Keyword(s):  
Mobile Robots ◽  
Control Law ◽  
Total Efficiency ◽  
Global Information ◽  
Centralized Control ◽  
Multiple Robots ◽  
Multiple Mobile Robots ◽  
Local Observation ◽  
Excessive Number ◽  
Explicit Communication

This paper deals with a framework of decentralized approach to division of labor by multiple mobile robots. An iterative-transportation task by multiple robots with multiple sets of starts (pick-up place of the object) and goals (put down place) is considered as the task. On each route between a start and a goal, the efficiency of transportation improves when the number of robots increases. Due to jams, however, excessive number of robots on the same route causes inefficiency. We propose a control law of each robot to choose an appropriate route so as to optimize the total efficiency of the transportation, where each robot utilizes information which can be obtained only by local observation (without any explicit communication among robots). The proposed control is based on the estimation of the number of robots on the routes in the future. In simulation, it was verified that the proposed control law realized 96% efficiency of the fully centralized control by appropriately choosing the route, compared with the case where global information can be utilized.

scholarly journals Gaining insights into organizational communication dynamics through the analysis of implicit and explicit communication

2021 ◽  
Author(s):  
Lena C. Müller-Frommeyer ◽  
Simone Kauffeld
Keyword(s):  
Organizational Communication ◽  
Science Communication ◽  
Future Research ◽  
Function Words ◽  
Central Process ◽  
Communication Behaviors ◽  
Research And Practice ◽  
Communication Dynamics ◽  
Implicit And Explicit ◽  
Explicit Communication

AbstractThis report in the journal Gruppe. Interaktion. Organisation. Zeitschrift für Angewandte Organisationspsychologie aims at presenting how the analysis of implicit and explicit communication in organizational interaction can advance our insights into and implications for these interactions for research and science. Communication is a central process in modern organizations. Especially recurring forms of interaction in organizations (e.g., meetings or appraisal interviews) are of great importance for personal and organizational success. In these interactions, the communication between the interacting organizational members has a decisive impact on the interactions’ course and outcomes (e.g., satisfaction with the interaction, performance during the interaction). Therefore, the aim of this paper is to present two aspects of communication that are empirically shown to contribute to successful outcomes of organizational interactions. Based on a practical problem, we illustrate the analysis and implications of (1) implicit communication (that is, the use and coordination of unconsciously used function words such as pronouns, articles, or prepositions) and (2) explicit communication (that is, the overarching meaning of a statement). To further illustrate the practical relevance of both communication behaviors, we present empirical insights and their implications for practice. Taking a glance at the future, possible combinations of these communication behaviors, the resulting avenues for future research, and the importance of a strengthened cooperation between research and practice to gain more naturalistic insights into organizational communication dynamics are discussed.

UNIFORM SCATTERING OF AUTONOMOUS MOBILE ROBOTS IN A GRID

2011 ◽  
Vol 22 (03) ◽  
pp. 679-697 ◽  
Author(s):  
LALI BARRIÈRE ◽  
PAOLA FLOCCHINI ◽  
EDUARDO MESA-BARRAMEDA ◽  
NICOLA SANTORO
Keyword(s):  
Mobile Robots ◽  
Scattering Problem ◽  
Autonomous Mobile Robots ◽  
State Machines ◽  
Global Localization ◽  
Localization System ◽  
Constant Size ◽  
Finite State ◽  
Visibility Range ◽  
Explicit Communication

We consider the uniform scattering problem for a set of autonomous mobile robots deployed in a grid network: starting from an arbitrary placement in the grid, using purely localized computations, the robots must move so to reach in finite time a state of static equilibrium in which they cover uniformly the grid. The theoretical quest is on determining the minimal capabilities needed by the robots to solve the problem. We prove that uniform scattering is indeed possible even for very weak robots. The proof is constructive. We present a provably correct protocol for uniform self-deployment in a grid. The protocol is fully localized, collision-free, and it makes minimal assumptions; in particular: (1) it does not require any direct or explicit communication between robots; (2) it makes no assumption on robots synchronization or timing, hence the robots can be fully asynchronous in all their actions; (3) it requires only a limited visibility range; (4) it uses at each robot only a constant size memory, hence computationally the robots can be simple Finite-State Machines; (5) it does not need a global localization system but only orientation in the grid (e.g., a compass); (6) it does not require identifiers, hence the robots can be anonymous and totally identical.

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