Local map generation using position and communication history of mobile nodes

2010 ◽  
Author(s):  
Shinichi Minamimoto ◽  
Sae Fujii ◽  
Hirozumi Yamaguchi ◽  
Teruo Higashino
Keyword(s):  
Mobile Nodes ◽  
Communication History ◽  
Map Generation ◽  
History Of ◽  
Local Map

The History of Communication History

2015 ◽  
Author(s):  
Peter Simonson ◽  
Janice Peck ◽  
Robert T. Craig ◽  
John P. Jackson, Jr.
Keyword(s):  
Communication History ◽  
History Of

The epistemic project of open diplomacy and the League of Nations: Co-evolution between diplomacy, PR and journalism

2020 ◽  
Vol 25 (4) ◽  
pp. 607-621
Author(s):  
Arne Lorenz Gellrich ◽  
Erik Koenen ◽  
Stefanie Averbeck-Lietz
Keyword(s):  
League Of Nations ◽  
Communication Studies ◽  
Content Type ◽  
The Public ◽  
Communication History ◽  
History Of ◽  
The Subject ◽  
Collective Biography ◽  
The Public Sphere ◽  
Method Approach

PurposeThe article discusses findings from a research project on the communication history of the League of Nations. It departs from the League's normative goal of “open diplomacy”, which, from an analytical standpoint, can be framed as an “epistemic project” in the sense of a non-linear and ambivalent negotiation by communication of what “open diplomacy” should and could be. The notion of the “epistemic project” serves as an analytical concept to understand this negotiation of open diplomacy across co-evolving actors' constellations from journalism, PR and diplomacy.Design/methodology/approachThe study employs a mixed-method approach, including hermeneutic document analysis of UN archival sources and collective biography/prosopography of 799 individual journalists and information officers.FindingsIt finds that the League's conceptualisations of the public sphere and open diplomacy were fluent and ambivalent. They developed in the interplay of diverse actors' collectives in Geneva. The involved roles of information officers, journalists and diplomats were permeable, heterogenous and – not least from a normative perspective – conflictive.Originality/valueThe subject remains under-researched, especially from the perspective of communication studies. The study is the first to approach it with the described research framework.

scholarly journals Distributed Monocular SLAM for Indoor Map Building

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Ruwan Egodagamage ◽  
Mihran Tuceryan
Keyword(s):  
Mobile Agents ◽  
Single Agent ◽  
Map Building ◽  
Computational Framework ◽  
Critical Elements ◽  
Localization And Mapping ◽  
Monocular Slam ◽  
Map Generation ◽  
Indoor Tracking ◽  
Local Map

Utilization and generation of indoor maps are critical elements in accurate indoor tracking. Simultaneous Localization and Mapping (SLAM) is one of the main techniques for such map generation. In SLAM an agent generates a map of an unknown environment while estimating its location in it. Ubiquitous cameras lead to monocular visual SLAM, where a camera is the only sensing device for the SLAM process. In modern applications, multiple mobile agents may be involved in the generation of such maps, thus requiring a distributed computational framework. Each agent can generate its own local map, which can then be combined into a map covering a larger area. By doing so, they can cover a given environment faster than a single agent. Furthermore, they can interact with each other in the same environment, making this framework more practical, especially for collaborative applications such as augmented reality. One of the main challenges of distributed SLAM is identifying overlapping maps, especially when relative starting positions of agents are unknown. In this paper, we are proposing a system having multiple monocular agents, with unknown relative starting positions, which generates a semidense global map of the environment.

scholarly journals An Efficient Routing Protocol Using the History of Delivery Predictability in Opportunistic Networks

2018 ◽  
Vol 8 (11) ◽  
pp. 2215 ◽  
Author(s):  
Eun Lee ◽  
Dong Seo ◽  
Yun Chung
Keyword(s):  
Routing Protocol ◽  
Opportunistic Networks ◽  
Opportunistic Routing ◽  
Delay Tolerant Network ◽  
Buffer Size ◽  
Destination Node ◽  
Delivery Ratio ◽  
Mobile Nodes ◽  
Final Destination ◽  
History Of

In opportunistic networks such as delay tolerant network, a message is delivered to a final destination node using the opportunistic routing protocol since there is no guaranteed routing path from a sending node to a receiving node and most of the connections between nodes are temporary. In opportunistic routing, a message is delivered using a ‘store-carry-forward’ strategy, where a message is stored in the buffer of a node, a node carries the message while moving, and the message is forwarded to another node when a contact occurs. In this paper, we propose an efficient opportunistic routing protocol using the history of delivery predictability of mobile nodes. In the proposed routing protocol, if a node receives a message from another node, the value of the delivery predictability of the receiving node to the destination node for the message is managed, which is defined as the previous delivery predictability. Then, when two nodes contact, a message is forwarded only if the delivery predictability of the other node is higher than both the delivery predictability and previous delivery predictability of the sending node. Performance analysis results show that the proposed protocol performs best, in terms of delivery ratio, overhead ratio, and delivery latency for varying buffer size, message generation interval, and the number of nodes.

Failed awake craniotomy: a retrospective analysis in 424 patients undergoing craniotomy for brain tumor

2013 ◽  
Vol 118 (2) ◽  
pp. 243-249 ◽  
Author(s):  
Erez Nossek ◽  
Idit Matot ◽  
Tal Shahar ◽  
Ori Barzilai ◽  
Yoni Rapoport ◽  
...  
Keyword(s):  
Medical Center ◽  
Brain Regions ◽  
Awake Craniotomy ◽  
Gross Total Resection ◽  
Total Resection ◽  
Failure Group ◽  
Communication History ◽  
Hospitalization Period ◽  
Successful Group ◽  
History Of

Object Awake craniotomy for removal of intraaxial tumors within or adjacent to eloquent brain regions is a well-established procedure. However, awake craniotomy failures have not been well characterized. In the present study, the authors aimed to analyze and assess the incidence and causes for failed awake craniotomy. Methods The database of awake craniotomies performed at Tel Aviv Medical Center between 2003 and 2010 was reviewed. Awake craniotomy was considered a failure if conversion to general anesthesia was required, or if adequate mapping or monitoring could not have been achieved. Results Of 488 patients undergoing awake craniotomy, 424 were identified as having complete medical, operative, and anesthesiology records. The awake craniotomies performed in 27 (6.4%) of these 424 patients were considered failures. The main causes of failure were lack of intraoperative communication with the patient (n = 18 [4.2%]) and/or intraoperative seizures (n = 9 [2.1%]). Preoperative mixed dysphasia (p < 0.001) and treatment with phenytoin (p = 0.0019) were related to failure due to lack of communication. History of seizures (p = 0.03) and treatment with multiple antiepileptic drugs (p = 0.0012) were found to be related to failure due to intraoperative seizures. Compared with the successful awake craniotomy group, a significantly lower rate of gross-total resection was achieved (83% vs 54%, p = 0.008), there was a higher incidence of short-term speech deterioration postoperatively (6.1% vs 23.5%, p = 0.0017) as well as at 3 months postoperatively (2.3% vs 15.4%, p = 0.0002), and the hospitalization period was longer (4.9 ± 6.2 days vs 8.0 ± 10.1 days, p < 0.001). Significantly more major complications occurred in the failure group (4 [14.8%] of 27) than in the successful group (16 [4%] of 397) (p = 0.037). Conclusions Failures of awake craniotomy were associated with a lower incidence of gross-total resection and increased postoperative morbidity. The majority of awake craniotomy failures were preventable by adequate patient selection and avoiding side effects of drugs administered during surgery.

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