Linking satellites via Earth hot spots and the Internet to form ad hoc constellations

2005 ◽  
Author(s):  
Daniel Mandl ◽  
Stu Frye ◽  
Sandra Grosvenor ◽  
Mary Ann Ingram ◽  
John Langley ◽  
...  
Keyword(s):  
Hot Spots ◽  
Ad Hoc ◽  
The Internet

scholarly journals Sensor System: A Survey of Sensor Type, Ad Hoc Network Topology and Energy Harvesting Techniques

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 219
Author(s):  
Phuoc Duc Nguyen ◽  
Lok-won Kim
Keyword(s):  
Energy Harvesting ◽  
Large Scale ◽  
Ad Hoc ◽  
Sensor Nodes ◽  
Sensor System ◽  
Wireless Sensor ◽  
The Internet ◽  
Original Research ◽  
Energy Scavenging ◽  
Term Operation

People nowadays are entering an era of rapid evolution due to the generation of massive amounts of data. Such information is produced with an enormous contribution from the use of billions of sensing devices equipped with in situ signal processing and communication capabilities which form wireless sensor networks (WSNs). As the number of small devices connected to the Internet is higher than 50 billion, the Internet of Things (IoT) devices focus on sensing accuracy, communication efficiency, and low power consumption because IoT device deployment is mainly for correct information acquisition, remote node accessing, and longer-term operation with lower battery changing requirements. Thus, recently, there have been rich activities for original research in these domains. Various sensors used by processing devices can be heterogeneous or homogeneous. Since the devices are primarily expected to operate independently in an autonomous manner, the abilities of connection, communication, and ambient energy scavenging play significant roles, especially in a large-scale deployment. This paper classifies wireless sensor nodes into two major categories based the types of the sensor array (heterogeneous/homogeneous). It also emphasizes on the utilization of ad hoc networking and energy harvesting mechanisms as a fundamental cornerstone to building a self-governing, sustainable, and perpetually-operated sensor system. We review systems representative of each category and depict trends in system development.

Deviant writing and youth identity

2011 ◽  
Vol 2 (1) ◽  
pp. 58-79 ◽  
Author(s):  
Jin Liu
Keyword(s):  
Ad Hoc ◽  
Dominant Strategy ◽  
Written Language ◽  
The Internet ◽  
Youth Identity ◽  
Visual Style ◽  
Chinese Writing System ◽  
Standard Chinese ◽  
Youth Language ◽  
Chinese Writing

This paper examines the emergence of the representation of dialect with Chinese characters (fangyan wenzihua) on the Internet. The online dialect writing is primarily identified as a subject of Internet language and youth language study. The CMC discourse as a hybrid register mixing spoken and written language features facilitates the written use of oral dialect on the Internet. Deviating from the standard Chinese writing system, the Internet-savvy youth transcribe their native dialects on an ad hoc basis, which celebrates multiplicity, creativity, individuality and resists uniformity, standardization, and institutionalization. Taking the SHN website (www.shanghaining.com) as a case study, the paper discusses how the written Shanghai Wu words are explored to mark a distinct visual style and to articulate a distinct local youth identity. Furthermore, this paper examines the dominant strategy of phonetic borrowing in dialect transcription on the Internet. It is argued that diachronically, the youth’s phonocentric obsession tapped into the May Fourth tradition of the baihua vernacular movement that was heavily influenced by the European logocentrism; and synchronically, the celebration of dialect sound on the Internet echoes the contemporary soundscape of local dialects formed in the mass media in recent years.

An Optimal Fuzzy Load Balanced Adaptive Gateway Discovery for Ubiquitous Internet Access in MANET

Fuzzy Systems ◽  
2017 ◽  
pp. 663-681 ◽  
Author(s):  
Prakash Srivastava ◽  
Rakesh Kumar
Keyword(s):  
Fuzzy Logic ◽  
Natural Disaster ◽  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Internet Access ◽  
The Internet ◽  
Optimal Selection ◽  
Multiple Parameters ◽  
Gateway Discovery ◽  
Selection Of

A mobile ad hoc network (MANET) is an autonomous collection of independent nodes cooperating together to form an infrastructure less network spontaneously. For increasing usability of MANET domain which finds application in natural disaster such as earthquake, floods etc. it is also desired to be connected with Internet through Internet gateways. Therefore, an efficient gateway discovery mechanism is required for MANET-Internet integration. Existing schemes use one or multiple parameters for optimal selection of gateway which causes a particular gateway to be selected many times which results in higher delay latency and packet drops due to prevailing congestion at a particular gateway. To avoid this situation, the authors have utilized the potential of fuzzy logic to ascertain the decision of load balancing at the Internet gateway. Besides this, their scheme also incorporates an effective adaptive gateway discovery mechanism. Consequently, enhanced performance is achieved as compared to existing state-of-the-art related schemes. The proposed approach is evaluated by simulation and analytical validation.

scholarly journals An Efficient Relayed Broadcasting based on the Duplication Estimation Model for IoT Applications

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 2038
Author(s):  
Youngboo Kim ◽  
Eun-Chan Park
Keyword(s):  
Wireless Ad Hoc Networks ◽  
Ad Hoc ◽  
The Internet ◽  
Estimation Model ◽  
Simple Method ◽  
Broadcast Storm ◽  
Iot Applications ◽  
Transmission Opportunity ◽  
Hoc Networks ◽  
The Internet Of Things

In this paper, we consider relay-based broadcasting in wireless ad hoc networks, which can enable various emerging services in the Internet of Things (IoT). In this kind of traffic dissemination scheme, also known as flooding, all the nodes not only receive frames but also rebroadcast them. However, without an appropriate relay suppression, a broadcast storm problem arises, i.e., the transmission may fail due to severe collisions and/or interference, many duplicate frames are unnecessarily transmitted, and the traffic dissemination time increases. To mitigate the broadcast storm problem, we propose a reasonable criterion to restrict the rebroadcasting named the duplication ratio. Based on this, we propose an efficient mechanism consisting of duplication suppression and re-queuing schemes. The former discards duplicate frames proactively in a probabilistic manner to decrease the redundancy whereas the latter provides a secondary transmission opportunity reactively to compensate for the delivery failure. Moreover, to apply the duplication ratio practically, we propose a simple method to approximate it based on the number of adjacent nodes. The simulation study confirms that the proposed mechanism tightly ensured the reliability and decreased the traffic dissemination time by up to 6-fold compared to conventional mechanisms.

A hierarchical approach of integrating Mobile ad hoc Network and the internet

2008 ◽  
Author(s):  
Khaleel Ur Rahman Khan ◽  
Rafi U. Zaman ◽  
A. Venugopal Reddy ◽  
Kashifa Hafeez ◽  
Tabassum Sultana
Keyword(s):  
Ad Hoc Network ◽  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
The Internet ◽  
Hierarchical Approach ◽  
Mobile Ad Hoc
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