scholarly journals Analysis of a Frequency Response of a Noisy Optical Network for Its Self-adaptation

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Artur Rataj ◽  
Amira Kamli ◽  
Tulin Atmaca
Keyword(s):  
Frequency Response ◽  
Computer Network ◽  
Optical Network ◽  
Packet Transmission ◽  
Step Frequency ◽  
Safe Limits ◽  
Self Adaptation ◽  
Optical Ring ◽  
Adaptation Scheme

Abstract We study the quality of frequency response in a noisy optical network. Such a response can be useful in traditional frequency-domain industrial loop controllers. In particular, we analyse a (step, frequency) response of a simulated computer network, where the stimulus is one of the coefficients which regulate the network’s strategy of packet transmission, and the response is the network’s momentary performance. This way, we find a frequency range, where an instantaneous dependence between the stimulus and the response can direct a self-adaptation scheme of the proposed strategy due to changing network conditions. To stay in the safe limits of the network’s behaviour, we make the stimulus weak. We use a bursty traffic model to test the limits of this approach. We use a model of an optical ring of an experimental NGREEN network developed at NOKIA. The discussed technique was capable of optimising the network’s behaviour.

MULTISTAGE MICROSTRIP UHF LOAD

2018 ◽  
pp. 53-57 ◽  
Author(s):  
G. G. Savenkov ◽  
V. P. Razinkin ◽  
A. D. Mekhtiev
Keyword(s):  
Frequency Response ◽  
Frequency Band ◽  
High Power ◽  
Two Stage ◽  
High Power Microwave ◽  
Modelling Method ◽  
Optimal Values ◽  
Inductive Elements ◽  
Power Microwave

Applications of modern terminal loads and its relevant disadvantages are described in this paper. The decomposing method of wideband microwave high power microstrip loads design is proposed in this paper with purpose of matching quality improving. Multiple extension of multistage load bandwidth is provided by using of external matching circuit and internal matching inductive elements. The maximum reachable bandwidth of multistage load is estimated and optimal values of mathing circuit elements are founded on basis of equivalent lumped scheme. The topology of microstrip two-stage high power microwave load is developed and its frequency response, calculated via numeric electrodynamic modelling method is outlined in the paper. Modelling results show good matching quality of considered load at the frequency band below 3,5 GHz.

scholarly journals FPGA–implementation of PID-controller by differential evolution optimization

2018 ◽  
Vol 8 (1) ◽  
pp. 395-402
Author(s):  
Mika Hanhila ◽  
Timo Mantere ◽  
Jarmo T. Alander
Keyword(s):  
Differential Evolution ◽  
Pid Controller ◽  
Differential Evolution Algorithm ◽  
Fpga Implementation ◽  
Solution Convergence ◽  
Fitness Value ◽  
Mutation Operation ◽  
Self Adaptation ◽  
Evolution Algorithm

Abstract We will describe an FPGA implementation of PID-controller that uses differential evolution to optimize the coefficients of the PID controller, which has been implemented in VHDL. The original differential evolution algorithm was improved by ranking based mutation operation and self-adaptation of mutation and crossover parameters. Ranking-based mutation operation improves the quality of solution, convergence rate and success of optimization. Due to the self-adaptive control parameters, the user does not have to estimate the mutation and crossover rates. Optimization have been performed by calculating for each generation fitness value by means of trial parameters. The final optimal parameters are selected based on the minimum fitness.

TRANSMISSION RELIABILITY OF A STOCHASTIC IMPERFECT VERTEX COMPUTER NETWORK WITH PACKET UNRELIABILITY AND TIME ATTRIBUTES

2013 ◽  
Vol 20 (05) ◽  
pp. 1350018
Author(s):  
YI-KUEI LIN ◽  
CHENG-FU HUANG
Keyword(s):  
Network Topology ◽  
Packet Loss ◽  
Data Center ◽  
Computer Network ◽  
Packet Delay ◽  
Solution Procedure ◽  
Transmission Reliability ◽  
Reliability Issue ◽  
Internet Data Center

Quality of the received data at the sink can be based on packet delay, packet errors, packet loss, etc. From the viewpoint of quality of service (QoS), the packet unreliability (PU) and transmission time are both of critical attributes to assess internet quality for supervisor and customers. A computer system is usually modeled as a network topology with arcs and vertices where each arc denotes a transmission medium and each vertex represents an Internet data center. Due to failure, partial failure, maintenance, etc., each component (arc or vertex) should be considered as stochastic. The network with imperfect vertices is more complex to evaluate the reliability issue because vertex failure results in the disablement of adjacent arcs. Such a network named a stochastic imperfect vertex computer network (SIVCN) is addressed in this paper. We study how the data can be delivered through multiple minimal paths simultaneously within both permitted PU and time constraint. A solution procedure comprising two efficient algorithms is proposed to assess transmission reliability accordingly.

Quality of Service of Data Broadcasting Algorithms on Erroneous Wireless Channels

2011 ◽  
pp. 421-436
Author(s):  
Paolo Barsocchi ◽  
Alan A. Bertossi ◽  
M. Cristina Pinotti ◽  
Francesco Potortì
Keyword(s):  
Quality Of Service ◽  
Polynomial Time ◽  
Wireless Channels ◽  
Transmission Error ◽  
Packet Transmission ◽  
Optimal Solutions ◽  
Bernoulli Model ◽  
Data Scheduling ◽  
Transmission Errors

Broadcasting is an efficient and scalable way of transmitting data over wireless channels to an unlimited number of clients. In this chapter the problem of allocating data to multiple channels is studied, assuming flat data scheduling per channel and the presence of unrecoverable channel transmission errors. The behavior of wireless channels is described by the Bernoulli model, in which each packet transmission has the same probability to fail and each transmission error is independent from the others. The objective is that of minimizing the average expected delay experienced by the clients. Optimal solutions can be found in polynomial time when all data items have unit lengths, while heuristics are presented when data items have non-unit lengths. Extensive simulations, performed on benchmarks whose item popularities follow Zipf distributions, show that good sub-optimal solutions are found.

scholarly journals Self-Adaptation of mHealth Devices: The Case of the Smart Cane Platform

Proceedings ◽  
2019 ◽  
Vol 31 (1) ◽  
pp. 23 ◽  
Author(s):  
Inmaculada Ayala ◽  
Joaquín Ballesteros ◽  
Juan Caro-Romero ◽  
Mercedes Amor ◽  
Lidia Fuentes
Keyword(s):  
Energy Consumption ◽  
Relative Error ◽  
Contextual Information ◽  
Assistive Technologies ◽  
Assistive Devices ◽  
Product Lines ◽  
Trade Off ◽  
Self Adaptation ◽  
Battery Consumption

Nowadays, more than one billion people are in need of one or more assistive technologies, and this number is expected to increase beyond two billion by 2050. The majority of assistive technologies are supported by battery-operated devices like smartphones and wearables. This means that battery weight is an important concern in such assistive devices because it may affect negatively its ergonomics. Saving power in these assistive devices is of utmost importance for its potential twofold benefits: extend the device life and reduce the global warming aggravated by billion of these devices. Dynamic Software Product Lines (DSPLs) are a suitable technology that supports system adaptation, in this case, to reduce energy consumption at runtime, considering contextual information and the current state of the device. However, a reduction in battery consumption could negatively affect other quality of service parameters, like response time. Therefore, it is important to trade-off battery saving and these other concerns. This work illustrates how to approach the self-adaptation of smart assistive devices by means of a DSPL-based strategy that optimizes battery consumption taking into account other QoS parameters at the same time. We illustrate our proposal with a real case study: a Smart Cane that is integrated with a DSPL platform, Tanit. Experimentation shows that it is possible to make a trade-off between different quality concerns (energy consumption and relative error). The results of the experiments allow us to conclude that the Tanit approach elongates battery duration of the Smart Cane in one day (an increase of a 6% with a relative error of 1%), so we improve the user quality of experience and reduce the energy footprint with a reasonable relative error.

OXADM dalam Sistem Keselamatan Rangkaian Cincin Metropolitan

2012 ◽  
Author(s):  
Mohammad Syuhaimi Ab–Rahman ◽  
Seri Mastura Mustaza ◽  
Mohd Saiful Dzulkefly Zan ◽  
Aida Baharudin
Keyword(s):  
Optical Network ◽  
Ring Network ◽  
Protection Scheme ◽  
Safe Area ◽  
Pass Through ◽  
Ring Protection ◽  
Ring Architecture ◽  
Cross Connect ◽  
Optical Ring ◽  
Add And Drop Multiplexer

Pemultipleks Tambah Gugur Silang Optik (OXADM) merupakan satu peranti optik hibrid baru yang dihasilkan melalui gabungan dua peranti asal, iaitu Pemultipleks Tambah Gugur Optik (OADM) dan Sambung Silang Optik (OXC). Ianya telah dibangunkan berdasarkan kajian terhadap kelemahan peranti sedia ada dengan beberapa ciri baru dan menarik telah dimasukkan. OXADM diperkenalkan untuk meningkatkan tahap keselamatan dalam rangkaian cincin. Dengan adanya ciri ‘Pengumpulan’ membolehkan perlindungan multipleks diaktifkan di mana kesemua isyarat yang melalui nod optik akan dikumpulkan di atas satu talian perlindungan/persediaan sekiranya berlaku kerosakan pada talian bekerja dalam rangkaian optik cincin. Antara skema perlindungan lain yang diperkenalkan oleh OXADM ini adalah perlindungan linear dan perlindungan cincin. OXADM membenarkan isyarat membuat pusingan secara ‘U’ secara dalaman untuk mengkuarantinkan kawasan kerosakan daripada kawasan yang selamat. Kedua–dua ciri inilah yang membezakan OXADM dengan peranti–peranti sebelumnya. Dengan adanya peranti OXADM ini membolehkan sebarang kerosakan yang berlaku dalam rangkaian optik dapat dipulihkan segera dengan mengaktifkan skema perlindungan yang sesuai berdasarkan jenis dan lokasi kerosakan yang berlaku. OXADM ini merupakan peranti pertama yang mengintegrasikan ketiga–tiga jenis mekanisme keselamatan rangkaian di dalam satu peranti. Kata kunci: OXADM; skema keselamatan; rangkaian cincin; simulasi, perkakasan The Optical Cross Add & Drop Multiplexer (OXADM) is a new hybrid optical device which has the combination of the original Optical Add And Drop Multiplexer (OADM) and Optical Cross Connect (OXC) devices. OXADM is developed based on the study on the demerits of the existing devices and new features are added to the device. OXADM is introduced to increase the survivability in ring architecture network. With its ‘Accumulation’ feature enable the multiplexing protection scheme can be activated where all the signals pass through an optical node are multiplexed onto a single path as a protection/preparation in case breakdown happens at the working line in an optical ring network. Other protection schemes provided by OXADM are the Linear Protection and Ring Protection. OXADM enable the signal to route internally as U turn to segment the breakdown area from the safe area. Both features have differentiated the OXADM with the previous existing device. With this new OXADM device, any breakdown happens in an optical network can be quickly fixed by activating the appropriate protection scheme based on the type and the location of the breakdown. OXADM device is known as the first device that integrates all three network safety mechanisms onto a single device. Key words: OXADM; protection scheme; ring network; simulation; hardware

scholarly journals KLASIFIKASI PENGGUNAAN PROTOKOL KOMUNIKASI PADA TRAFIK JARINGAN MENGGUNAKAN ALGORITMA K-NEAREST NEIGHBOR

2016 ◽  
Vol 16 (1) ◽  
pp. 67
Author(s):  
Komang Kompyang Agus Subrata ◽  
I Made Oka Widyantara ◽  
Linawati Linawati
Keyword(s):  
Quality Of Service ◽  
Network Traffic ◽  
Network Architecture ◽  
Nearest Neighbor ◽  
Computer Network ◽  
Data Communication ◽  
Data Capture ◽  
K Nearest Neighbor ◽  
High Level

ABSTRACT—Network traffic internet is data communication in a network characterized by a set of statistical flow with the application of a structured pattern. Structured pattern in question is the information from the packet header data. Proper classification to an Internet traffic is very important to do, especially in terms of the design of the network architecture, network management and network security. The analysis of computer network traffic is one way to know the use of the computer network communication protocol, so it can be the basis for determining the priority of Quality of Service (QoS). QoS is the basis for giving priority to analyzing the network traffic data. In this study the classification of the data capture network traffic that though the use of K-Neaerest Neighbor algorithm (K-NN). Tools used to capture network traffic that wireshark application. From the observation of the dataset and the network traffic through the calculation process using K-NN algorithm obtained a result that the value generated by the K-NN classification has a very high level of accuracy. This is evidenced by the results of calculations which reached 99.14%, ie by calculating k = 3. Intisari—Trafik jaringan internet adalah lalu lintas ko­mu­nikasi data dalam jaringan yang ditandai dengan satu set ali­ran statistik dengan penerapan pola terstruktur. Pola ter­struktur yang dimaksud adalah informasi dari header paket data. Klasifikasi yang tepat terhadap sebuah trafik internet sa­ngat penting dilakukan terutama dalam hal disain perancangan arsitektur jaringan, manajemen jaringan dan keamanan jari­ngan. Analisa terhadap suatu trafik jaringan komputer meru­pakan salah satu cara mengetahui penggunaan protokol komu­nikasi jaringan komputer, sehingga dapat menjadi dasar pe­nen­tuan prioritas Quality of Service (QoS). Dasar pemberian prio­ritas QoS adalah dengan penganalisaan terhadap data trafik jaringan. Pada penelitian ini melakukan klasifikasi ter­hadap data capture trafik jaringan yang di olah menggunakan Algoritma K-Neaerest Neighbor (K-NN). Apli­kasi yang digu­nakan untuk capture trafik jaringan yaitu aplikasi wireshark. Hasil observasi terhadap dataset trafik jaringan dan melalui proses perhitungan menggunakan Algoritma K-NN didapatkan sebuah hasil bahwa nilai yang dihasilkan oleh klasifikasi K-NN memiliki tingkat keakuratan yang sangat tinggi. Hal ini dibuktikan dengan hasil perhi­tungan yang mencapai nilai 99,14 % yaitu dengan perhitungan k = 3. DOI: 10.24843/MITE.1601.10

Sign in / Sign up

Export Citation Format

Share Document