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检索条件"任意字段=Conference on All-Optical Communication Systems: Architecture, Control and Network Issues"

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A novel approach to advanced asynchronous transfer mode for high-speed computer communication networks

A novel approach to advanced asynchronous transfer mode for ...

引用

IEEE International conference on ATM

作者： K. Toyoshima K. Hayashi NTT Optical Network Systems Laboratories Yokosuka Japan

The number of Internet users continues to increase due to the popularity of the WWW (World Wide Web). Intranets and extranets have also become very popular as they enable the efficient use of data within companies and enhance business processing speed. IP (Internet protocol) packets are used to realize most of these computer communication services. IP belongs to the network layer in the OSI reference model, so the transfer performance of IP is influenced by the technology used in the data link layer under the network layer. One communication technology for the data link layer is ATM (asynchronous transfer mode). ATM technology was researched and recommended for B-ISDN (broadband integrated services digital network). We have been tackling an Internet/intranet/extranet backbone system that offers high speed, high throughput, small delay and low cost by IP/MAC (media access control) over ATM. However we faced the problem that ATM does not completely suit IP packet and MAC frame transfer. For example, there is the "dead cell problem" in which the loss of even one of the ATM cells forming the IP packet causes the loss of the entire packet. There is also the "cell tax problem", in which the overhead of ATM cells is much larger than those of other long distance transfer techniques. Perfect EPD (early packet discard) is impossible because there is no indication bit that means a cell includes the head or tail part of a datagram in the payload. Moreover, intelligent and effective application use is difficult because the cell header has few CLP (cell loss priority) bits. This paper describes the main problems of datagram transfer across existing ATM networks and details a new cell structure that solves these problems. Other issues relating to this remodelling of the existing cell structure are also examined.

关键词： Asynchronous transfer mode Extranets B-ISDN World Wide Web Web sites Companies Web and internet services Protocols Open systems communications technology

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Dynamic load balancing techniques for flexible wireless industrial networks

Dynamic load balancing techniques for flexible wireless indu...

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Annual conference of Industrial Electronics Society

作者： Mario Collotta Lucia Lo Bello Emanuele Toscano Orazio Mirabella Department of Computer Engineering and Telecommunications Universita Catania Italy

This paper deals with load management in flexible industrial networks, characterized by a hybrid wired/wireless architecture and mobile wireless nodes. Our target scenario is an industrial network, in which data is exchanged between sensors and actuators running on the wireless side and a wired automation network. As many unpredictable elements affect the performance of wireless data transmission, it is necessary to control the load over the different Access Points (AP) through dynamic balancing policies. In traditional WLANs, one station selects the AP to connect with on the basis of the received signal strength indicator (RSSI). This approach may cause all active mobile stations to connect to a small subset of the APs and saturate their capacity, while other APs may still be underloaded. This paper shows a dynamic technique to manage the unbalanced load caused by moving nodes and fluctuating channel characteristics. Simulation results highlight the advantage of the proposed technique over the standard AP selection mechanism and another load balancing approach in the literature.

关键词： Wireless communication Mobile communication Load management Real time systems Quality of service Delay Heuristic algorithms

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Placement of Optimized Number of Wireless Sensor Nodes to Design an Efficient Monitoring network 2

Placement of Optimized Number of Wireless Sensor Nodes to De...

引用

2nd IEEE International conference on Wireless communications, Signal Processing and networking (WiSPNET)

作者： Ganguly, Somesh Mondal, Sribas Ghosh, Arnab Konar, Gargi Chakraborty, Niladri Jadavpur Univ Power Engn Dept Kolkata India

ISBN: (纸本)9781509044429

Wireless sensor networks have come into recognition nowadays as the potential monitoring tool for all remote systems. The deficiencies of the wired networks has somewhat been eliminated by the wireless networks but still some limitations exist. Often the wireless nodes become dead when battery power is exhausted and data is lost due to interferences. This work aims to design a reliable architecture where the optimum number of routers and their best suited position are determined with the help of Cultural Algorithm (CA). This will help to develop a reliable data communication pathway with minimum amount of interferences among the sensor nodes. Four sensors are placed initially to collect data from four different sources while the position of the control station has been fixed. The results obtained from optimization have been used for hardware implementation of the wireless network in a physical environment in Power Engineering Department of Jadavpur University, Saltlake Campus, Kolkata. The routers are placed as per the positions obtained from the optimization. Thus, a reliable path with optimum number of routers is obtained. CA has been implemented with the novel idea of considering the drawbacks of wireless network such as signal overlap and complete coverage of the sensor nodes as the constraint functions. The data from the sensors are continuously being monitored in the control station through this network. Reliable communication through newly deployed nodes justifies the result obtained from CA. This model would help to deploy routers in applications involving large number of sensors to form a less congested wireless network.

关键词： Cultural Algorithm Interference Reliability Router Placement Wireless Sensor network

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WSN for Food Product Quality control

WSN for Food Product Quality Control

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IEEE International Workshop on Intelligent Data Acquisition and Advanced Computing systems: Technology and Applications

作者： Volodymyr Romanov Igor Galelyuka Oleksandr Voronenko V.M. Glushkov Institute of Cybernetics of National Academy of Sciences of Ukraine Kyiv Ukraine

ISBN: (纸本)9781665426060

Quality control of food products, including beverages, during the production process is an important task that can be successfully solved by information technology. Currently, quality control of wine, beer, juices and other beverages is carried out using biochemical control, which takes a time and requires the application of complex analytical devices under the control of qualified personnel. The development of information technologies, biosensors, sensor networks makes it possible to solve the problem of quality control of various beverages in express mode. The main contribution of this paper is the design and prototyping of wireless amperometric biosensors and wireless sensor network (WSN) on their base to monitor the concentration of various components in beverages. The WSN architecture was modified for technological process of winemaking. Wireless biosensors were tested with different types of enzymes on different concentration of solutions. Such tests confirm the possibility to use the wireless biosensors on some stages of technological process of winemaking. The upgrading wireless nodes by sensing unit with particular enzymes will allow covering all technological process.

关键词： Wireless communication Wireless sensor networks Protocols Quality control Biochemistry Food products Sensors

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Timing stability of active Q-switched mode-locked laser for synchronous laser ranging network

Timing stability of active Q-switched mode-locked laser for ...

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IEEE Instrumentation and Measurement Technology conference

作者： H. Kunimori T. Otsubo B. Engelkemier T. Yoshino B. Greene Communications Research Laboratories Tokyo Japan Electro Optic Systems Private Limited Queanbeyan NSW Australia

The communications Research Laboratory (CRL) has been developing a laser time synchronization system based on a satellite laser ranging (SLR). The system directs to control all the firing time of the pulse laser so that each laser pulse reaches at a target satellite exactly on a specified epoch within 100 ns. A conventional Nd:YAG active-passive laser has been upgraded to an active Q-switched mode-locked laser to reduce the firing time jitters with respect to command time. The epoch triggered fire control has also been introduced to ensure command time to take account on prediction, clock error and other fixed delay. It has been demonstrated that the timing stability of firing is several 10 ns level including one way range prediction error to a target satellite.< >

关键词： Laser stability Timing Laser mode locking optical pulses Synchronization Artificial satellites optical control communication system control control systems Jitter

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Call admission control algorithm for multipoint-to-multipoint communications in heterogeneous network

Call admission control algorithm for multipoint-to-multipoin...

引用

International conference on Information, communications and Signal Processing

作者： H. Yokota T. Asami N. Shacham KDD R&D Laboratories Kamifukuoka Japan SRI International Inc. Menlo Park CA USA

Call admission control (CAC) in a multipoint-to-multipoint (multiple-source, multiple-destination) environment is discussed. We present a new CAC algorithm which combines admissions from all sources to maximize the performance. Firstly, we consider point-to-multipoint CAC, which is designed to maintain fairness, efficiency and low complexity. Then we extend it to multipoint-to-multipoint CAC. By introducing two new mechanisms which we call "partial selection" and "negative message sending mechanism", our approach is made robust enough to avoid a deadlock. We also discuss the issues of a trade-off between delay performance and resource utilization.

关键词： Call admission control Streaming media Quality of service System recovery Resource management Robustness Protocols Availability Intelligent networks communication system control

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Migrating the Subscribers of a Prepaid Service

Migrating the Subscribers of a Prepaid Service

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International conference on systems and International conference on Mobile communications and Learning Technologies, (ICN/ICONS/MCL) International conference on networking

作者： M. Cheboldaeff Lucent Technologies Inc. USA

When migrating a service from a legacy system to a target platform, the tasks associated to the introduction of the new platform should be distinguished from the subscriber data migration itself. Migrating the subscriber data of a Prepaid service is a complex operation because data at Application level is checked in real-time when the service is triggered, and further influences the actual behaviour of the service delivered to the end-subscriber. In most cases, telcos want to avoid service interruption for end-subscribers. But the migration steps take some time, so there is always a delay between the moment when subscriber data is dumped from the legacy system and the moment when it can be actually uploaded onto the target platform. Consequently, updates during migration windows cannot be taken into account. In order to avoid any credit loss for the end-subscribers, recharges should be blocked in that time frame. Besides, the routing of the calls and the subscriber location information need to be updated in the customer environment too. A detailed migration procedure involving all the steps on the legacy system, on the target platform, and on the Core network needs to be designed. Two examples of successful Prepaid Migration are given, one at KPNMobile, one at Vodafone. In the context of the IMS architecture, the current issues with Migration could eventually be simplified in the future.

关键词： Delay effects Routing Guidelines Concrete Mobile communication communications technology

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COVID-19 Detection using Convolutional Neural network architectures based upon Chest X-rays Images

COVID-19 Detection using Convolutional Neural Network Archit...

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International conference on ent Computing and control systems (ICICCS)

作者： Ram Murti Rawat Shivam Garg Naman Jain Gagan Gupta Delhi Technological University Delhi India

The novel Coronavirus has really been the unexpected Catastrophe, which no one could have even thought of. It has emerged as a pandemic and has raised questions on the health infrastructure and facilities available as it is required to get a large number of people tested. RT-PCR is the standard diagnostic test being used. But there are several issues with RT-PCR testing like relying only on one approach even when it is getting difficult for most countries to procure the required amount of testing kits, also there have been some cases of false positive results. all these factors definitely call for a search of alternative testing methodologies, so it not reqired to rely on just one approach. Apart from RT-PCR testing, Chest X-rays can be a great tool to know about the status and severity of COVID-19. Once obtaining the chest X-rays of a person a call has to be made on the COVID-19 status and that needs very high accuracy and expertise and again there will be a shortage of the expertise. So, a solution has been proposed to this problem by developing a COVID-19 detection system, which can assist the medical experts regarding the report and then the experts can make a final call. As observed, DeepLearning techniques, especially Convolutional Neural network (CNN) have proven to be outstanding in medical image classification and analysis, and as our task is similar to medical image classification, CNN is a good choice for our use case. So, we analyzed four different CNN architectures on Chest X-ray for Covid-19 Diagnosis. The models used are pretrained on ImageNet datasets. Transfer Learning has been used to generate results. A comparative study of the results obtained with different architecture reveals that structures based on CNN have great potential for Covid-19 diagnosis and detection.

关键词： COVID-19 Transfer learning Computer architecture Tools Convolutional neural networks Task analysis X-ray imaging

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Use of DoDAF and M&S for the Design Requirements and Optimization of a GIG-Enabled Wideband Mesh-networking Waveform

Use of DoDAF and M&S for the Design Requirements and Optimiz...

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MILCOM, Military communications conference

作者： Andrew Hunton Robert Frye Chris Hammer Todd Haynes Phong Khuu Steve Mosteiro Richard Nogay Michael Weber BAE Systems Network Enabled Solutions Wayne NJ USA

As the DoD evolves its network-centric infrastructure to support transformation, there is an increasing need to use a structured process to develop and optimize GIG-enabled networked communications and their underlying waveform layers. This paper describes an approach to this problem using DoD architecture framework (DoDAF), which has been tailored (waveform DoDAF) for the development of networked communication waveforms. We also cover the network modeling and simulation (M&S) process which supports validation and optimization of the resulting waveform protocols. The challenge of today's communication waveform specification working groups centers around the problem of generating a waveform that maximizes customer utility and data throughput, while effectively managing network connectivity, quality of service, and spectrum use. Existing, ad-hoc waveform specification methods lack operational discipline and typically do not result in a waveform meeting DoD needs. The waveform DoDAF methodology centers on a systematic transfer function from operational views (OVs), through communication laydowns or system views (SVs), to detailed waveform requirements. Using this process, complex multi-access mechanisms, physical layer attributes and layer 2/3 protocols are linked to operationally-based drivers, not stove-piped engineering concepts. An overview of each step of the process is covered, along with examples of OV, SV, and waveform views for key network-centric use-case scenarios. The paper includes a waveform application example showing the successful use of waveform DoDAF for the generation of a GIG-enabled, high capacity, RF wideband mesh networking waveform. The approach described in this paper can be used for all types of communication waveforms, including narrowband RF, wideband RF, and free-space optical (FSO) communications.

关键词： Design optimization Wideband Radio frequency Protocols Throughput Quality management Quality of service Transfer functions Physical layer Mesh generation

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The devil is in the metadata — New privacy challenges in Decentralised Online Social networks

The devil is in the metadata — New privacy challenges in De...

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IEEE Annual conference on Pervasive Computing and communications Workshops (PerCom)

作者： Benjamin Greschbach Gunnar Kreitz Sonja Buchegger School of Computer Science and Communication KTH Royal Institute of Technology Stockholm Sweden

Decentralised Online Social networks (DOSN) are evolving as a promising approach to mitigate design-inherent privacy flaws of logically centralised services such as Facebook, Google+ or Twitter. A common approach to build a DOSN is to use a peer-to-peer architecture. While the absence of a single point of data aggregation strikes the most powerful attacker from the list of adversaries, the decentralisation also removes some privacy protection afforded by the central party's intermediation of all communication. As content storage, access right management, retrieval and other administrative tasks of the service become the obligation of the users, it is non-trivial to hide the metadata of objects and information flows, even when the content itself is encrypted. Such metadata is, deliberately or as a side effect, hidden by the provider in a centralised system. In this work, we aim to identify the dangers arising or made more severe from decentralisation, and show how inferences from metadata might invade users' privacy. Furthermore, we discuss general techniques to mitigate or solve the identified issues.

关键词： Privacy Peer to peer computing Data privacy Social network services Encryption Access control

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