Search results for "NETWORKING"
showing 10 items of 1776 documents
Transportation in the Philippines
2017
Linking the islands of the archipelago was traditionally done by boat. Today, ships are still used by millions of people to cross straits between the major islands, since there are no bridges except from Leyte to Samar. Cebu lies at the center of the ferries network, while small bangkas bring people to remote islets or through river mouths and harbors. The implementation of the Strong Republic Nautical Highway aims at speeding up and smoothing transfers from island to island. The port of Manila, a small player in the dynamic West Pacific rim, may be relieved from congestion with the rise of Batangas and Subic. Aviation, centered at the saturated Manila airport, has grown quickly since dereg…
Edukacyjne aspekty energetycznej globalizacji
2018
Wokół handlu energią i surowcami do jej produkcji skupiają się wszystkie klasyczne problemy związane z procesem globalizacji. Problemy ekologiczne wynikające z produkcji energii elektrycznej przekraczają granice polityczne, a realizacja celów pakietu klimatycznego oraz wdrażanie zasad zrównoważonego rozwoju napotyka na liczne bariery i jest szeroko kontestowane przez niektóre grupy społeczne. W związku z tym tworzy się przestrzeń do pogłębionych działań edukacyjnych i promocyjnych na ich rzecz. W prezentowanej pracy skupiono się na edukacyjnych aspektach związanych z tą problematyką oraz na wykorzystaniu w edukacji nieformalnej serwisów społecznościowych przy promowaniu zasad zrównoważonego…
Verkkohuijausten tyypit sosiaalisessa mediassa
2017
Types of online scams in social media. In this thesis, types of online scams in social media are examined first by defining online scams and then applying the principles of them to social media setting. The thesis is a literature review in which it was found that in social media there are similar types of scams than outside of it. These types of scams were phishing scams, scams related to social engineering malware attacks and 419 -scams. There were a couple of scam scenarios that were not detected outside of social media context due to social networking site required as a platform for the scams. These were scams involving impersonation of celebrities or friends, services offering followers…
Requirements for Energy Efficient Edge Computing: A Survey
2018
Internet of Things is evolving heavily in these times. One of the major obstacle is energy consumption in the IoT devices (sensor nodes and wireless gateways). The IoT devices are often battery powered wireless devices and thus reducing the energy consumption in these devices is essential to lengthen the lifetime of the device without battery change. It is possible to lengthen battery lifetime by efficient but lightweight sensor data analysis in close proximity of the sensor. Performing part of the sensor data analysis in the end device can reduce the amount of data needed to transmit wirelessly. Transmitting data wirelessly is very energy consuming task. At the same time, the privacy and s…
Latency-Oblivious Distributed Task Scheduling for Mobile Edge Computing
2018
Mobile Edge Computing (MEC) is emerging as one of the effective platforms for offloading the resource- and latency-constrained computational services of modern mobile applications. For latency- and resource-constrained mobile devices, the important issues include: 1) minimize end-to-end service latency; 2) minimize service completion time; 3) high quality-of-service (QoS) requirement to offload the complex computational services. To address the above issues, a latencyoblivious distributed task scheduling scheme is designed in this work to maximize the QoS performance and goodput for the MEC services. Unlike most of the existing works, we consider the latency-oblivious property of different …
Optimization of Linearized Belief Propagation for Distributed Detection
2020
In this paper, we investigate distributed inference schemes, over binary-valued Markov random fields, which are realized by the belief propagation (BP) algorithm. We first show that a decision variable obtained by the BP algorithm in a network of distributed agents can be approximated by a linear fusion of all the local log-likelihood ratios. The proposed approach clarifies how the BP algorithm works, simplifies the statistical analysis of its behavior, and enables us to develop a performance optimization framework for the BP-based distributed inference systems. Next, we propose a blind learning-adaptation scheme to optimize the system performance when there is no information available a pr…
Modeling and Mitigating Errors in Belief Propagation for Distributed Detection
2021
We study the behavior of the belief-propagation (BP) algorithm affected by erroneous data exchange in a wireless sensor network (WSN). The WSN conducts a distributed multidimensional hypothesis test over binary random variables. The joint statistical behavior of the sensor observations is modeled by a Markov random field whose parameters are used to build the BP messages exchanged between the sensing nodes. Through linearization of the BP message-update rule, we analyze the behavior of the resulting erroneous decision variables and derive closed-form relationships that describe the impact of stochastic errors on the performance of the BP algorithm. We then develop a decentralized distribute…
Restoration and Enhancement of Historical Stereo Photos
2021
Restoration of digital visual media acquired from repositories of historical photographic and cinematographic material is of key importance for the preservation, study and transmission of the legacy of past cultures to the coming generations. In this paper, a fully automatic approach to the digital restoration of historical stereo photographs is proposed, referred to as Stacked Median Restoration plus (SMR+). The approach exploits the content redundancy in stereo pairs for detecting and fixing scratches, dust, dirt spots and many other defects in the original images, as well as improving contrast and illumination. This is done by estimating the optical flow between the images, and using it …
Moving RTS/CTS to the frequency domain: an efficient contention scheme for 802.11ax networks
2019
In this paper, we propose a contention mechanism based on the execution of multiple contention rounds in the frequency domain (ReCHo), which is designed to offer high throughput performance and robustness with respect to imperfect carrier sensing. The main idea is using narrow tones as signalling messages for performing channel access contentions and allowing the Access Point (AP) to echo these signals, in order to extend the sensing capabilities to all the stations associated to the AP. In particular, we refer to the emerging IEEE 802.11ax standard, showing how our scheme can boost performance of random access with respect to the current version of IEEE 802.11ax OFDMA Back-Off (OBO), even …
'Good to Repeat': Making Random Access Near-Optimal with Repeated Contentions
2020
Recent advances on WLAN technology have been focused mostly on boosting network capacity by means of a more efficient and flexible physical layer. A new concept is required at MAC level to exploit fully the new capabilities of the PHY layer. In this article, we propose a contention mechanism based on Repeated Contentions (ReCo) in frequency domain. It provides a simple-to-configure, robust and short-term fair algorithm for the random contention component of the MAC protocol. The throughput efficiency of ReCo is not sensitive to the number of contending stations, so that ReCo does not require adaptive tuning of the access parameters for performance optimization. Efficiency and robustness is …