Frame Repetition Research Articles

Effect of block size on BER performance of inverse filtering based MIMO FBMC

Filter bank multicarrier (FBMC) is a novel next-generation data transfer technique. FBMC has a large number of benefits over conventional orthogonal frequency division multiplexing (OFDM) techniques. The FBMC scheme suffers from imaginary interference, which degrades the bit error rate (BER) performance at the receiver. In the recent past, inter carrier interference (ICI)-free Alamouti-coded FBMC frame and block repetition schemes for BER improvement were discussed. However, in the analysis, various interfering terms are neglected. In this work to reduce ICI and inter symbol interference (ISI), the concept of inverse filtering is applied while considering other interfering terms. Inverse filtering can be used to reduce the negative impacts of the ICI and ISI. This is determined by mathematical modelling that includes the ICI, ISI, and other interfering parameters. The simulation is performed in MATLABR software. The obtained BER at an SNR of 15 dB is 2.3 × 10−4.The simulation results are also compared with some of the recent methods, and it has been found that the proposed scheme is better in comparison to the considered recent methods.

Capture: American Pursuits and the Making of a New Animal Condition

Capture: American Pursuits and the Making of a New Animal Condition

Segment frame replication and elimination for redundant routing provision in the FlexE-over-WDM networks

Flexible Ethernet (FlexE)-over-WDM is one of the promising technologies of 5G transport networks that aims to provide a variety of Ethernet MAC rates over large capacity wavelength channels. Ultra-reliable communication is a key scenario of 5G, which poses a big challenge to the transport networks. To achieve ultra-reliability, frame replication and elimination for reliability (FRER) was proposed by IEEE. 802.1CB to provide redundant transmission in layer 2. However, previous studies of FRER considered to replicate MAC frames at source node and eliminate them at the destination, which may cause a waste of network resources, especially for the services that require different reliabilities in a condition of network with different packet loss rates of link and node. To this end, we propose a novel redundant routing scheme, called segment FRER (S-FRER), to balance the reliability and network efficiency. And a FlexE group allocation scheme is coming with S-FRER to assign the Flexible Ethernet channels along the path. Two heuristic algorithms, which are end-to-end FRER (E-FRER) and ordinal FRER (O-FRER), are compared with S-FRER. Simulation results show that S-FRER can satisfy diverse reliability requirements of services, and the resource redundancy and equipment cost are condensed.We further take the resource utilization efficiency as the optimization goal, and propose a FlexE Group allocation strategy based on segmented frame repetition and elimination to realize the resource redistribution of service flows on redundant routes. The experimental results verify the effectiveness of the scheme in terms of resource utilization efficiency.

The irony of sectarianism: Sectarianizing by desectarianizing in Syria

AbstractThe study seeks to resolve a conundrum in Syrian politics: the ruling regime has always claimed and celebrated a harmonious social fabric, national unity, and a long‐standing tradition of coexistence despite the prevalence of an opposite grim reality marked by sectarian divisions and factionalism which the regime itself mainly created or sustained. I explore the process of acting “as if not” by analyzing the speeches of Syria's President Bashar al‐Assad since the eruption of the conflict in 2011, a period when the country has been buffeted by extreme sectarian waves. The process shows how Assad has constructed a process of desectarianization based on repetition, frequency, and resonance of specific frames in his speeches, and also based on building an image of an idealized present of internal unity and integration. The process includes externalizing sectarianization as a “western” import and emphasizing the regime's ideologies of pan‐Arab nationalism and secularism as bulwarks against it. Furthermore, the Assad regime has taken credit as a “desectarianization guardian” in different ways including maintaining the status quo and consolidating the impression of his active positive leadership drawn on taking the country down the path of unity and solidarity. However, ironically, desectarianization has also entrenched the very sectarian practices which it claimed its mission to stand against. Sectarianisation and desectarianization are both sides of the same coin in Syria's politics of authoritarianism.

Виды комбинированных синтаксических повторов (на материале текстов русскоязычных писателей Казахстана)

In the literature devoted to types of repetitions, one can find research on so called ‘combined repetition’. However, linguistic works that deal with syntactic techniques, imagery means, means of linking in a sentence and text do not provide description of combinations consisting of two or more types of repetitions. In our opinion, solution to this issue depends on the basis of the study. The syntactic-stylistic approach makes it possible to identify the following combinations of syntactic repetitions: parallelism and frame repetition; parallelism and anaphora; parallelism and catch-up. In addition to a combination of two types of repetitions, the paper describes combinations of three types of repetitions: parallelism, anaphora, parcellation; parallelism, anaphora, paragraph. The identified versions of combination allowed us to conclude that one of the types of repetitions is parallelism. The connection between various syntactic repetitions was studied both at the level of the complex syntactic whole, constructions with another person’s speech and at the level of a paragraph, despite the fact that a paragraph can be considered both as a syntactic and a compositional-stylistic unit. The paper outlines directions for the study of combined repetitions. Apart from describing combinations within one level, it is necessary to carry out research at the junction of several levels of the language. This will make it possible to identify new variants of interaction of units belonging to different levels, possibly those not previously presented in theoretical works. This is the main line for further research. In addition, the use of various factual materials, namely literary texts, characterized by a variety of grammatical structures, will make it possible to identify new combinations of repetitions.

LoRa Channel Characterization for Flexible and High Reliability Adaptive Data Rate in Multiple Gateways Networks

We characterize the LoRa channel in terms of multi-path fading, loss burstiness, and assess the benefits of Forward Error Correction as well as the influence of frame length. We make these observations by synthesizing extensive experimental measurements realized with The Things Network in a medium size city. We then propose to optimize the LoRaWAN Adaptive Data Rate algorithm based on this refined LoRa channel characterization and taking into account the LoRaWAN inherent macro-diversity from multi-gateway reception. Firstly, we propose ADRopt, which adjusts Spreading Factor and frame repetition number to maintain the communication below a target Packet Error Rate ceiling with optimized Time-On-Air. Secondly, we propose ADRIFECC, an extension of ADRopt in case an Inter-Frame Erasure Correction Code is available. The resulting protocol provides very high reliability even over low quality channels, with comparable Time on Air and similar downlink usage as the currently deployed mechanism. Simulations corroborate the analysis, both over a synthetic random wireless link and over replayed real-world packet transmission traces.

Frame Repetition: A Solution to Imaginary Interference Cancellation in FBMC/OQAM Systems

In this paper, we propose a complex-valued symbol based FBMC/OQAM (C-FBMC/OQAM) system to achieve the self-cancellation of intrinsic imaginary interference. The key idea is the employment of a well-designed repeated frame, in which complex-valued QAM symbols are transmitted instead of only real-valued symbols in the classical FBMC/OQAM systems. It is proven that, intrinsic interference among symbols can be eliminated in the proposed C-FBMC/OQAM systems, and the spectral efficiency is maintained even in the existence of repeated frame. Simulation results shows that the proposed C-FBMC/OQAM system and preamble structures for channel estimation demonstrate improved robustness against frequency selective fading channels compared to conventional FBMC/OQAM systems due to the intrinsic interference cancellation.

Effects of Frame Repetition Through Cues in the Online Environment

Research has shown that message frames can shape a reader’s subsequent judgments on political issues. In the online news environment, additional cues outside the story may be present that can affect the power of the frame. This online experiment investigates the role of repetitive cues in the framing processes using news editorials and their accompanying recommended headlines that repeat the editorial’s frame. Results suggest that regarding issue-related attitudes and emotions, consistent frame repetition reinforced the effects of the original article when the frame’s relevance to the readers was high but undermined the article’s impact when the relevance was low. Implications for framing studies and online news consumption are discussed.

Video Compression Based on Spatio-Temporal Resolution Adaptation

A video compression framework based on spatio-temporal resolution adaptation (ViSTRA) is proposed, which dynamically resamples the input video spatially and temporally during encoding, based on a quantisation-resolution decision, and reconstructs the full resolution video at the decoder. Temporal upsampling is performed using frame repetition, whereas a convolutional neural network super-resolution model is employed for spatial resolution upsampling. ViSTRA has been integrated into the high efficiency video coding reference software (HM 16.14). Experimental results verified via an international challenge show significant improvements, with BD-rate gains of 15% based on PSNR and an average MOS difference of 0.5 based on subjective visual quality tests.

Using Noise Level to Detect Frame Repetition Forgery in Video Frame Rate Up-Conversion

Frame repetition (FR) is a common temporal-domain tampering operator, which is often used to increase the frame rate of video sequences. Existing methods detect FR forgery by analyzing residual variation or similarity between video frames; however, these methods are easily interfered with by noise, affecting the stability of detection performance. This paper proposes a noise-level based detection method which detects the varying noise level over time to determine whether the video is forged by FR. Wavelet coefficients are first computed for each video frame, and median absolute deviation (MAD) of wavelet coefficients is used to estimate the standard deviation of Gaussian noise mixed in each video frame. Then, fast Fourier transform (FFT) is used to calculate the amplitude spectrum of the standard deviation curve of the video sequence, and to provide the peak-mean ratio (PMR) of the amplitude spectrum. Finally, according to the PMR obtained, a hard threshold decision is taken to determine whether the standard deviation bears periodicity in the temporal domain, in which way FR forgery can be automatically identified. The experimental results show that the proposed method ensures a large PMR for the forged video, and presents a better detection performance when compared with the existing detection methods.

A novel method for copyright protection of digital videos using SWEA and ZPA technique

Digital copyright protection has become an effective way to prove the ownership and protect the multimedia contents from illegal use and unauthorized users. In order to prove the ownership of a video certain security program is embedded in a video and one of the ways of ensuring the ownership of a video is embedding the watermark in a video. In this paper, a new approach to digital video copyright protection, SWEA (Split watermark embedding algorithm) with Zero Padding Algorithm (ZPA) is proposed. With the help of this algorithm, it is hard to know the original pattern of watermark because of SWEA and minimizing the perceptual degradation of watermarked video because of ZPA. Here we are using ‘db1’ wavelet domain for embedding the watermark in the LL sub-band of the original identical frame (I-frame), based on the energy of high-frequency sub-band in an adaptive manner. SCD (Scene changed detection) is used to find out the identical frame (I-frame). The proposed algorithm has undergone various attacks, such as compression, uniform noise, Gaussian noise frame repetition and frame averaging attacks. The proposed algorithm, sustain all the above attacks and offers improved performance compared with the other methods from the literature.

Opinion Formation in Social Media: The Influence of Online News Dissemination on Facebook Posts

ABSTRACTThis study aims to explore the influence of online news dissemination on public opinion in social media and examine what factors determine the influence. Online news stories (N=51) from 37 sources and Facebook posts (N=317) on the construction of Africa’s first modern international railway line, the Ethiopia-Djibouti railway line, were retrieved between June and November 2017 for the period April 11, 2012 to November 30, 2017. Comparative content analysis of online news and Facebook posts revealed that there was positive correlation between frame repetition by news media and prevalence of the frame in social media opinion. The results showed that there were statistically significant associations in the presence of positive as well as negative frame tones between news articles and Facebook posts. However, the relationship in the use of neutral frame tone between news and opinion was not significant. Regarding composition, short news stories exert more influence on social media opinion than longer news articles, as indicated by negative correlation between news article length and its influence on opinion. Overall, the results suggest that online news dissemination strongly influences opinion formation in social media.

The Basque farmhouses of Zelaa and Maiz Goena: New dendrochronology-based findings about the evolution of the built heritage in the northern Iberian Peninsula

The Basque farmhouse, a characteristic building type for north-western Spain, is an architectural solution that allows the combined management of different rural activities. In addition to providing living quarters and a space for a cider press these farmhouses were designed to function as, among others, stable, barn and warehouse. They were often owned and managed by one family, with no links to ecclesiastic organizations. Architectural studies have established that these buildings first were constructed at the end of the 15th century without previous local precedent. This places their initial construction in a calm and relatively secure period, when the wars between the aristocratic lineages which had started in 1418, and which had resulted in assaults, looting and fires, had come to an end. The timing of their first occurrence has led to the interpretation that they represent a building tradition imported from the North. Dendrochronological research initially confirmed their late fifteenth-century origin. However recent restoration work in two previously undocumented farmhouses at Ezkio and Lazkao (Gipuzkoa territory) has enabled a reassessment of this interpretation. The architectural analysis of these buildings shows that their construction plans, which are quite similar, deviates from the general plan according to which the majority of Basque farmhouses were built. The newly identified model, wholly executed in wood with the exception of the roof covering, is based on the repetition of frames and bays. Together these generate the volume of the building, which is larger than the volume of other farmhouses. We collected a total of 81 oak (Quercus sp.) samples from both farmhouses and using Basque chronology ARAB9 as a reference established that these represent trees that were cut down in the spring of 1445 and in 1453 respectively. Since construction most likely took place within a few years after the trees were felled, this indicates that Basque farmhouses began to be constructed decades earlier than expected. At that time wars still raged in the Basque Country. If it is true that the political situation determined the degree of diffusion of non-indigenous architectural concepts in this region, the new findings can be interpreted as supporting the hypothesis that Basque farmhouses reflect a regionally-developed building tradition.

Noise-level estimation based detection of motion-compensated frame interpolation in video sequences

Motion-Compensated Frame Interpolation (MCFI) is commonly used to produce the fake high-frame-rate videos, and it can be regarded as a video forgery operation from a broad sense. In this paper, we use the noise-level estimation to expose MCFI operator, and exploit the periodicity of noise-level varying to propose an effective automatic detection method. To guarantee the high detection accuracy, the high-pass filtering and the spike enhancement are both employed to extract the peak outliers in the Fourier domain. Depending on these outliers, we design the criterion of credibility value to make a final decision. The extensive experiments evaluated on hundreds of video sequences with different spatial resolutions and two parameter configurations of H.264/AVC have shown that the validity of the proposed method, which has the better detection accuracy for the MCFI method and the frame repetition.

Detecting video frame-rate up-conversion based on periodic properties of edge-intensity

Video frame-rate up-conversion (FRUC) is one of the common temporal-domain operations. From the earlier frame repetition and linear interpolation, FRUC has been developed to motion compensated frame interpolation (MCFI), which effectively overcomes the temporal jerkiness and ghosting shadows. In a broad sense, FRUC can be regarded as a video forgery operation. By experiments, it is observed that FRUC still leads to edge dis-continuity or over-smoothing artifacts around object boundaries. In this paper, an edge-intensity based passive forensics approach is proposed to detect the possible FRUC operation in candidate video. After computing the edge intensities of every frame, Kaufman adaptive moving average (KAMA) is exploited to define an adaptive threshold to distinguish the interpolating frames by FRUC from the original frames. Moreover, the original frame-rate of up-converted video can be inferred. Experimental results show that the proposed approach is not only effective for simple frame repetition and linear interpolation, but also valid for advanced FRUC techniques such as MCFI. The detection accuracy is up to 94.5% on average. Its computation is simple as well.

Dual-modality wire-mesh sensor for the visualization of three-phase flows

Three-phase gas–liquid–liquid flows are very common in petroleum extraction, production, and transport. In this work a dual-modality measuring technique is introduced which may be well applied for three-phase flow visualization. The measuring principle is based on simultaneous excitation with two distinct frequencies to interrogate each crossing point of a mesh sensor, which in turn are linked to conductive and capacitive parts of fluid impedance. The developed system can operate eight transmitter and eight receiver electrodes at a frame repetition frequency up to 781 Hz. The system has been evaluated by measuring reference components. The overall measurement uncertainty was 8.4%, which considering the fast repetition frequency of measurements is suitable for flow investigation. Furthermore, a model-based method to fuse the data from the dual-modality wire-mesh sensor and to obtain individual phase fraction of gas–oil–water flow is introduced. Here a parametrized model is fitted to the measured conductivity and permittivity distributions enabling one to obtain phase fraction from measured data. The method has been applied and tested to the acquired data from a mesh sensor in static and dynamic three-phase mixtures of gas, oil, and water. Fused images and quantitative values show good agreement with reference values. The newly developed dual-modality wire-mesh sensor has the potential to investigate three-phase flows to a good degree of detail, being a valuable tool to investigate such flows.

출판만화 칸새의 유형별 특징

칸과 칸의 반복을 통해 만화는 그 내용과 이미지를 구동시키고 독자에게 전달한다. 칸은 시 공간의 단면적 요소를 담고 있으며, 칸의 반복은 이러한 단면들을 연속되는 흐름으로 변화시키는 역할을 한다. 연속적 흐름을 원활하게 이어주는 역할은 칸과 칸 사이에 존재하는 칸새에 의해 이루어지고 초창기 칸새의 운용은 칸에 의한 수동적 의미가 대부분이었다. 그러나 칸새는 단지 칸과 칸을 이어주는 매개체의 역할뿐만 아니라 만화 구성에 새로운 표현 방식을 창출하는 효율적 참여 장치이다. 칸새의 특징적 기능은 만화의 역사와 궤를 같이 하며 만화의 구성에 새로운 연출방식을 제시하며 그 명맥을 이어왔다. 칸새의 특징적 기능으로는 장면전환 기능, 회상 기능, 말칸 기능, 팬 기능, 장식적 기능으로 크게 나눌 수 있고 이들 유형은 칸새의 직접적인 표현방식으로 만화연출에 능동적으로 기능한다. 이 기능적 요소들은 작가가 의도한 바에 의해 표현되고 서술되는 내용에 따라 그 빈도가 일정치 않지만 보편화된 경우, 작가 개개인의 차이가 누적되어 활용되는 빈도에 따라 새로운 연출구성의 방향이 제시될 수도 있을 것이다. Cartoons exhibit contents and images and deliver them to readers by repeating frames. Frames embody the cross sectional factors of space-time, and the repetition of frames makes those cross sectional factors into a continuous flow. The gutter, which exists between frames, takes the role to make the continuous flow link smoothly, and at the beginning stage of the gutter, the operating of the gutter was usually passive by the frame meanings. However, the gutter is not just a medium for linking the frames, but is an efficient participation device for creating new expression methods of cartoon organization. By producing new directing methods for cartoon organization, the distinctive functions of the gutter have been kept alive with cartoon history. The distinctive functions of the gutter can be divided largely into transition function, reminiscence function, speech balloon function, pen function, and decorative function. And those functions perform actively as direct expression method of the gutter. When those functional methods are expressed by the author's intention and the frequency of them is generalized according to described contents, using each author's individual differences can suggest direction for new directing organization of cartoons.

Video Watermarking With Empirical PCA-Based Decoding

A new method for video watermarking is presented in this paper. In the proposed method, data are embedded in the LL subband of wavelet coefficients, and decoding is performed based on the comparison among the elements of the first principal component resulting from empirical principal component analysis (PCA). The locations for data embedding are selected such that they offer the most robust PCA-based decoding. Data are inserted in the LL subband in an adaptive manner based on the energy of high frequency subbands and visual saliency. Extensive testing was performed under various types of attacks, such as spatial attacks (uniform and Gaussian noise and median filtering), compression attacks (MPEG-2, H. 263, and H. 264), and temporal attacks (frame repetition, frame averaging, frame swapping, and frame rate conversion). The results show that the proposed method offers improved performance compared with several methods from the literature, especially under additive noise and compression attacks.

Effects of the local resonance on the wave propagation in periodic frame structures: Generalized Newtonian mechanics

This work is devoted to the study of the wave propagation in infinite two-dimensional structures made up of the periodic repetition of frames. Such materials are highly anisotropic and, because of lack of bracing, can present a large contrast between the shear and compression deformabilities. Moreover, when the thickness to length ratio of the frame elements is small, these elements can resonate in bending at low frequencies when compressional waves propagate in the structure. The frame size being small compared to the wavelength of the compressional waves, the homogenization method of periodic discrete media is extended to situations with local resonance, and it is applied to identify the macroscopic behavior at the leading order. In particular, the local resonance in bending leads to an effective mass different from the real mass and to the generalization of the Newtonian mechanics at the macroscopic scale. Consequently, compressional waves become dispersive and frequency bandgaps occur. The physical origin of these phenomena at the microscopic scale is also presented. Finally, a method is proposed for the design of such materials.

High-speed multichannel impedance measuring system

In this paper, a novel high-speed multichannel impedance measuring system in presented. The measurements are based on simultaneous excitation with two distinct frequencies to interrogate the multiple sensing point of a given sensor. Received signals are analogue-to-digital converted (with a DAQ card) and the amplitudes of each frequency are determined using FFT implemented in LabVIEW. The capacitive and conductive parts of impedance are calculated based on amplitude measurements. The developed system can operate 8 transmitter and 8 receiver electrodes at a frame repetition frequency of up to 781 Hz, i.e. single channels are sampled at 6,248 Hz. The system has been evaluated by measuring reference components. Deviations from references values are below 10% which considering the fast repetition frequency of measurements is satisfactory. The developed system was applied to visualize the fluid distribution over the surface of planar multipoint sensor. Two different liquids (oil and water) and air were evaluated and their spatial distribution over the sensor’s surface was correctly visualized.