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Academic literature on the topic 'Correlation direction finder'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Correlation direction finder"

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Сорочан, Анатолий Григорьевич, Дмитрий Александрович Добряк, and Оксана Анатольевна Добряк. "Doppler direction finder J-correlation processing." Eastern-European Journal of Enterprise Technologies 6, no. 9(66) (December 12, 2013): 4. http://dx.doi.org/10.15587/1729-4061.2013.19003.

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Kozeruk, S. O., and O. V. Korzhyk. "Correlation direction finder for small aircraft." Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 79 (December 30, 2019): 41–47. http://dx.doi.org/10.20535/radap.2019.79.41-47.

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Kazakov, G. N., A. M. Petrakov, and V. A. Shevtsov. "Accuracy Estimation of a Correlation Interferometric Direction-Finder." Russian Aeronautics 61, no. 4 (October 2018): 620–28. http://dx.doi.org/10.3103/s1068799818040177.

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Tsyporenko, V. V., and V. G. Tsyporenko. "Research of Direct Digital Correlative-Interferometric Radio Direction Finder with Double Correlation-convolutional Processing." Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 65 (June 30, 2016): 51–61. http://dx.doi.org/10.20535/radap.2016.65.51-61.

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Lapaev, N. G., A. V. Ksendzuk, and P. A. Gerasimov. "ACCURACY OF BEARING DETERMINATION IN A THREE-CHANNEL MONOPULSE AMPLITUDE CORRELATION DIRECTION FINDER." Issues of radio electronics, no. 3 (March 20, 2019): 36–40. http://dx.doi.org/10.21778/2218-5453-2019-3-36-40.

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In the work, the study of the achievable accuracy of determining the coordinates of the radiating in the radio range of spacecraft using a three‑element amplitude correlation direction finder has been performed. The proposed scheme makes it possible to select single and group low‑power complex signals and simultaneously determine the bearings of several sources, the signals of which can be separated in time‑frequency‑code space. As an example, the radiation pattern of a three‑element antenna system with an orthogonal arrangement of partial diagrams with respect to the equal‑signal direction is considered. The results of statistical modeling of the correlation processing algorithm obtained for a three‑channel monopulse system with a 3.7° pattern width and estimates of the potential accuracy of determining the bearing are presented. Simulation results are given to evaluate the instrumental accuracy of the direction finder. The proposed method of direction finding provides the ability to determine the geodetic coordinates of aerospace objects using the station electronic reconnaissance.
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Sorochan, A. G., and Vladimir P. Kharchenko. "J-CORRELATION DIRECTION FINDER WITH IMPROVED CHARACTERISTICS OF A TIME DELAY METER." Telecommunications and Radio Engineering 77, no. 11 (2018): 957–69. http://dx.doi.org/10.1615/telecomradeng.v77.i11.30.

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Tsyporenko, V. V. "Optimization of Exactness of Direct Digital Correlation-Interferometer Direction-finder with Double Сorrelation Processing." Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 64 (March 30, 2016): 86–100. http://dx.doi.org/10.20535/radap.2016.64.86-100.

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Ципоренко, Віталій Валентинович, Валентин Григорович Ципоренко, Владислав Вікторович Чухов, and Олександр Володимирович Андреєв. "Analysis of the speed of a searchless digital correlation-interferometric direction finder with two-dimensional correlation processing of the spatial signal." Journal of Zhytomyr State Technological University. Series: Engineering, no. 1 (81) (June 21, 2018): 210–16. http://dx.doi.org/10.26642/tn-2018-1(81)-210-216.

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Uskov, S. "MODULE CALIBRATION CORRELATION INTERFEROMETRY DIRECTION FINDERS." Актуальные направления научных исследований XXI века: теория и практика 2, no. 4 (November 5, 2014): 282–85. http://dx.doi.org/10.12737/6166.

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Thomas, C. K., B. H. Ross, and R. B. Stein. "Motor-unit recruitment in human first dorsal interosseous muscle for static contractions in three different directions." Journal of Neurophysiology 55, no. 5 (May 1, 1986): 1017–29. http://dx.doi.org/10.1152/jn.1986.55.5.1017.

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Spike-triggered averaging was used to extract the twitch tensions and contraction times of 144 motor units from the first dorsal interosseous muscle of four subjects for three different directions of static contraction: abduction of the index finger, flexion of the index finger, and adduction of the thumb coupled with flexion of the index finger (hereafter referred to as adduction). Although the twitch tensions were generally largest for the abduction contraction, all units contributed tension to all three directions of contraction. A linear correlation was found for twitch tensions of motor units for the three directions of static contractions. Linear correlations were also found between twitch tension and threshold force of these motor units for each direction, which suggests that an orderly pattern of recruitment, according to increasing twitch size, adequately describes the function of human first dorsal interosseous muscle for all contraction directions. No clear evidence was found for separate groups of motor units in the muscle that were selectively activated for the different tasks. Rank order of recruitment for motor units in the three directions of contraction was correlated, but was not identical. The scatter in our data is discussed in relation to earlier reports of altered motor-unit recruitment during different movements.
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Dissertations / Theses on the topic "Correlation direction finder"

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Букар, Григорій Миколайович. "Акустична система виявлення і локалізації малих літальних апаратів." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/34775.

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Дипломна робота містить основну частину на 30 аркушах, 17 ілюстрацій та 1 таблицю. Метою роботи є розробка акустичної системи пеленгування безпілотних літальних апаратів. В роботі проведено аналітичний огляд літератури, встановлені акустичні характеристики випромінювання, вибрано тріангуляційний спосіб локалізації безпілотних літальних апаратів. Для визначення пеленгів запропоновано використати кореляційний метод. Комп’ютерне моделювання кореляційного пеленгатора дало змогу визначити відношення сигнал/завада для забезпечення достовірного виявлення.
Thesis contains the bulk of the 30 pages, 17 illustrations and 1 table. The aim of the work is to develop an acoustic guidance system for unmanned aerial vehicles. The analytical review of the literature is carried out, the acoustic characteristics of radiation are established, the triangulation method of localization of unmanned aerial vehicles is chosen. It is proposed to use the correlation method to determine the bearings. Computer simulation of the correlation direction finder made it possible to determine the signal-to-noise ratio to ensure reliable detection.
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McLaughlin, Amanda J. "Na+ channels enhance low contrast signalling in the superior-coding direction-selective circuit." Thesis, 2018. https://dspace.library.uvic.ca//handle/1828/9221.

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Light entering the eye is transformed by the retina into electrical signals. Extensive processing takes place in the retina before these signals are transmitted to the brain. Beginning in the outer retina, light-evoked electrical signals are distributed into parallel pathways specialized for different visual tasks, such as the detection of dark vs. bright ambient light, the onset or offset of light, and the direction of stimulus motion. Pathway diversity is a consequence of cell type diversity, differential cell connectivity, synapse organization, receptor expression, or any combination thereof. Cell connectivity itself can be accomplished through excitatory or inhibitory chemical synapses, or electrical coupling via gap junctions. Gap junctions are further specialized based on the expression of different connexin subunit isoforms. In aggregate, this diversity gives rise to ganglion cells with highly specialized functions, including ON and/or OFF responses, contrast-tuning and direction-selectivity (DS). The directionally-selective circuit, a circuit specialized for the encoding of stimulus motion, makes use of many of these circuit specializations. Bipolar cells, in response to glutamate release from cone photoreceptors, provide highly-sensitive glutamatergic input to amacrine cells and DS ganglion cells (DSGCs) in this circuit, while amacrine cells provide cholinergic and directionally-tuned GABAergic input to DSGCs. One population of DSGCs also transmit signals laterally to one another via gap junctions. Thus numerous specializations in bipolar cells, amacrine cells and ganglion cells endow DSGCs with their unique encoding abilities. In Chapters 2 and 3 of this dissertation I focus on synchronized firing between gap junction-coupled DSGCs. sDSGCs exhibit fine-scale correlations, with action potentials in an sDSGC more likely within ~2ms of action potential firing in a coupled neighbour. I first characterize electrical coupling of DSGCs through the identification of the molecular composition of DSGC gap junctions (Chapter 2). Physiological and immunohistochemical methods allowed me to demonstrate an important role for connexin 36 subunits in DSGC electrical coupling. Next (Chapter 3) I investigate the sub-cellular mechanisms underlying neuronal correlations between electrically coupled DSGCs. Using paired recordings, I show that chemical input (from bipolar cells and amacrine cells), electrical input (from gap junctions), and Na+ channel activity in DSGC dendrites underlie the generation of correlated spiking activity. While a common feature of electrically coupled networks, the mechanisms underlying correlations were previously unclear. In Chapter 4 I focus on the mechanisms within the DS circuit that endow these neurons with impressive sensitivity to stimulus contrast. Using physiological and pharmacological methods I first assess the relative contrast sensitivity of ganglion cells and starburst amacrine cells (SACs) in the DS circuit. The sensitivity of DSGC and SAC excitatory currents to antagonists of Na+ channels suggests an important role for these channels in amplifying low contrast responses and other weak inputs to the circuit. This role is later attributed to the differential expression of voltage-gated Na+ channels in specific bipolar cell populations. In aggregate, this dissertation describes several novel circuit mechanisms within the well-studied DS circuit. I also provide specific roles for such specializations in visual coding.
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Book chapters on the topic "Correlation direction finder"

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Shen, Jiaxing, Yi Lau, and Jiannong Cao. "Data-Driven Mall Advertising." In Smart Marketing With the Internet of Things, 123–38. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5763-0.ch007.

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Mall advertising is a critical factor for retailers to gain revenue. Traditional mall advertising strategies mainly rely on impression and empiricism which might be inefficient and result in a waste of resources. Recent research demonstrates that the effectiveness of advertisements can be affected by exposure time and relevance to customers. Authors in this chapter propose a data-driven approach to achieve these goals using fine-grained trajectories of customers. They first preprocess the trajectories and model the floorplan. Then detect stopping locations where customers stay for relatively long time and analyze the correlation between different locations. They also detect customers' facing directions at each stopping location. Lastly, according to the correlation of stopping locations and customers' facing direction, appropriate advertising locations and contents can be determined. According to evaluation analysis, the proposed approach can significant improve average advertisement exposure time and advertisement relevance by 75% and 58%, respectively.
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Rachida, Barkallah, Rym Taktak, Noamen Guermazi, Fahmi Zaïri, and Jamel Bouaziz. "Combination of Numerical, Experimental and Digital Image Correlation for Mechanical Characterization of Al2O3/β-TCP Based on CDM Criterion." In Advances in Fatigue and Fracture Testing and Modelling. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.99357.

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Cracks in engineering materials and structures can undergo different modes of deformation. This chapter presents a numerical and experimental approaches aimed to assess the fracture toughness and the Fracture behavior under tensile and shear loading of bioceramics based on commercial Alumina (Al2O3), synthesized Tricalcium phosphate (β-TCP). Conditioning was conducted at different percentages of TCP. After a sintering process at 1600°C for 1 hour, The Crack Straight Through Brazilian Disc were performed by image correlation during a mechanical test and numerical tests were carried out in order to find the angle where the pure mode II. A CDM based constitutive model was selected and implemented into a finite element code to study the damage of our bioceramics. The result of this combination was compared with the direction of crack propagation obtained experimentally. The directions of crack propagation found numerically were found in good agreement with those experimentally obtained by a mechanical test. Alumina-10 wt.% Tricalcium phosphate composites displayed the highest values of the fracture toughness. This value reached 8.76 MPa m1/2 MPa. The same optimal composition for the mode I and mode II stress intensity factor with maximum values of 7.6 MPa m1/2 and 8.45 MPa m1/2 respectively.
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Zaman, Noor, Azween Abdullah, and Muneer Ahmed. "Node Localization." In Wireless Sensor Networks and Energy Efficiency, 223–35. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0101-7.ch009.

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Wireless sensor networks (WSNs) are taking a major share with almost all types of different applications and especially, it is most suited in very harsh and tough environments, where it is too hard to deploy conventional network applications, for example in the forest fire area, battlefields during the war, chemical and thermal sites, and also for few underwater applications. WSNs are now becoming part of almost all applications because of their ease in deployment and cheaper cost. These networks are resource constraints, very small in size, computation, and with much less communication capabilities. Nodes are normally deployed in random fashion, and it’s too hard to find their location because there is no any predefined way like conventional networks to discern location. Location is highly important to know the data correlation: for example its target tracking, and to know actual vicinity of the any event occurrence. This chapter describes the current available approaches, issues, and challenges with current approaches and future directions for node localization, one by one. Node localization is highly important for large sensor networks where users desire to know about the exact location of the nodes to know the data location.
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Kennel, Charles F. "Convection For Northward Interplanetary Field." In Convection and Substorms. Oxford University Press, 1996. http://dx.doi.org/10.1093/oso/9780195085297.003.0013.

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Besides common sense, a number of results suggest that we can learn more about the slow “viscous” flow state by studying the magnetosphere during northward interplanetary field conditions. In particular, statistical studies have consistently identified a “residual” state of magnetospheric and ionospheric convection in northward field conditions. The integrated potential across the high latitudeionosphere does not drop below a certain resting value of about 20 kV even when the interplanetary field has been due north for several hours. There appears to be a similar residual component of geomagnetic activity that is independent of the direction of the interplanetary field (Scurry and Russell, 1991). Its correlation with the dynamic pressure of the solar wind strengthens our suspicion that it is related to viscosity. Will we be able to prove the convection in this residual state is driven by viscosity? Does the flow in northward field conditions resemble the underlying irregular flow state of the plasma sheet found at other times? Does the magnetosphere approach the teardrop configuration during prolonged intervals of northward interplanetary field? These are but a few of the questions that whet our interest in convection during northward field conditions. One does not arrive at the state of pure viscous convection immediately after the interplanetary field swings northward. Dungey (1963) was the first of many to argue that a northward magnetosheath field line will reconnect with an open tail lobe field line to create one that is connected to the ionosphere at one end and draped over the dayside magnetopause at the other. The sudden reconfiguration of stress will lead to sunward convection on the newly reconnected field lines. In the ionosphere, this superposes a “reverse” two-cell convection pattern in the central polar cap upon the two “direct” convection cells. If and when the draped reconnected field line finds a partner in the opposite tail lobe with which to reconnect, a newly closed field line will form. Dungey had imagined that the same magnetosheath field line would reconnect simultaneously with both tail lobes, in which case the rate at which open magnetic flux is closed depends upon the rate of tail-lobe reconnection.
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Conference papers on the topic "Correlation direction finder"

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Park, Cheol-sun, and Dae-young Kim. "The Fast Correlative Interferometer Direction Finder using I/Q Demodulator." In 2006 Asia-Pacific Conference on Communications. IEEE, 2006. http://dx.doi.org/10.1109/apcc.2006.255915.

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Ling Qin, Kexin Jia, and Zishu He. "Performance analysis of correlative interferometer direction finder using cosine function." In 2010 International Symposium on Intelligent Signal Processing and Communications Systems (ISPACS 2010). IEEE, 2010. http://dx.doi.org/10.1109/ispacs.2010.5704777.

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Anbar, Sultan, Mayank Tyagi, and Karsten Thompson. "Investigation of Compaction and Sand Migration Effect on Permeability and Non-Darcy Coefficient With Pore-Scale Simulations." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-42081.

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Compaction and sand migration are some of the main problems for the loosely consolidated and unconsolidated high rate gas reservoirs. A reliable estimation of the well productivity depends on accurate modeling of permeability and inertial effects. Therefore, the key objective of this paper is to quantify the flow parameters change in the case of compaction and sand migration, and the development of permeability and the non-Darcy coefficient correlations that can be used in reservoir simulations. The compaction effects are simulated by increasing grains diameters with the same ratio. Permeability and the non-Darcy coefficients are calculated from lattice Boltzmann method (LBM). Results indicate that permeability decrease is not directional and the change in permeability can be estimated from porosity change with a Kozeny-Carman type relation with an exponent of 3.2. A Kozeny-Carman type relation between the non-Darcy coefficient and permeability is also found with an exponent −1.303. For high compressibility reservoirs, estimation of the inertial effects from the correlations developed as a function of permeability and porosity may also lead to underestimation of the inertial effects. Sand migration causes pore-throat plugging that leads to significant reduction in permeability. Permeability impairment due to sand or fines migration is usually estimated from Kozeny-Carman type relation based on porosity. There is no study in the literature on how the inertial effects are changed with permeability impairment due to sand or fines migration. Sand particle plugging locations are found from the network simulations for different pore volume reduction, and corresponding permeability and the non-Darcy coefficient are calculated from LBM. It is found that permeability change with sand plugging is direction dependent: permeability reduction in the flow direction is twice compared to other directions. Porosity reduction does not depend on only pore-throat plugging, porosity can be decrease due to compaction and pore-surface deposition. Therefore, a correlation is developed to estimate permeability from pore-throat sand concentration. Even though permeability change is directional, the trend between permeability and the non-Darcy coefficient is similar and the magnitude of exponent in Kozeny-Carman type relation is larger, −1.803, compared to that of compaction.
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Hamakawa, Hiromitsu, Hiroki Matsuoka, Kazuki Hosokai, Eiichi Nishida, and Eru Kurihara. "Characteristics of Aerodynamic Sound Radiated From Two Finned Cylinders." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28855.

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In the present paper the attention is focused on the characteristics of aerodynamic sound radiated from two finned cylinders with tandem and staggered arrangement exposed to cross-flow. We measured the spectrum of SPL and flow velocity for the cylinder spacing ratios ranged from 0 to 1.05 in the transverse direction and the ratios from 1.24 to 6.8 in the flow direction at Reynolds number of 1.0×105−1.9×105. As a result, we found that the peak SPL and Strouhal number of vortex shedding for two finned cylinders depend on the cylinder spacing ratios as well as those for bare cylinders. The peak SPL of the spectrum varied complexly with the tube spacing ratio. The peak levels of SPL for tandem finned cylinders were approximately 8 dB lower than that for the tandem bare cylinders. At the cylinder spacing ratio of 1.24 in the flow direction, the peak SPL for two finned cylinders at the cylinder spacing ratio of 0.72 in the transverse direction was about 8 dB larger than that for tandem finned cylinders. The peak SPL depended on the spanwise correlation length of the Karman vortex formed in the near wake of the downstream of two finned cylinders.
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Sagrilo, Lui´s Volnei Sudati, Edison Castro Prates de Lima, and Arnaldo Papaleo. "A Joint Probability Model for Environmental Parameters." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57890.

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The joint probabilistic models (JPM) of the environmental parameters of wave, wind and current are nowadays extremely needed in order to perform reliability analyses of offshore structures. These JPM are also essential steps for the design of offshore structures based on long-term statistics and to perform dynamic response analysis of floating units that are strongly dependent on the directionality of the environmental actions, such as turret-moored FPSOs. Recently, some JPM have been proposed in the literature to represent the joint statistics of a reduced number of environmental parameters. However, it is difficult to find a practical and fully operational model taking into account the complete statistical dependence among all the environmental parameters intensities and their correspondent directions. In this paper, it is presented a straightforward methodology, based on the Nataf transformation, to create a JPM of the environmental parameters taking into account the dependence between the intensity and direction of all variables. The proposed model considers the statistical dependence of ten short-term variables: the significant wave height, peak period and direction of the sea waves, the significant wave height, peak period and direction of the swell waves, the amplitude and direction of the 1-h wind velocity and, finally, the amplitude and direction of the surface current velocity. The statistical dependence between them is evaluated using concepts of linear-linear, linear-circular and circular-circular variables correlation. Some results of the proposed JPM methodology are presented based on simultaneous environmental data gathered in a location offshore Brazil.
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Abdi, Iman Ashtiani, Morteza Khashehchi, and Kamel Hooman. "Investigation of Large-Scale Structures Behind a Single Tube (Finned and Foamed Tube) Using Two-Point Correlations." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21236.

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Flow structures downstream of a finned-tube are compared to those of an identical pipe; with the same diameter and length, covered with a foam layer. The standard case of cross-flow over a bare tube, i.e. no surface extension, is also tested as a benchmark. Experiments are conducted in a wind tunnel at Reynolds numbers of 4000 and 16000. Particle image velocimetry (PIV) was used for flow visualization on two different perpendicular planes. To characterize the size of the flow structures downstream of the tube, for each of the aforementioned case, two-point correlation, as a statistical analysis tool, has been used. It has been observed that by decreasing the Reynolds number, the flow structures are further stretched in streamwise direction for both bare and finned-tube cases. This is, however, more pronounced with the former. Interestingly, with a foam-wrapped tube the sizes of the flow structures are found to be independent of the Reynolds number. Finally, the structure sizes are smaller in the case of the foam-wrapped tube compared to those of finned-tube.
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Yan, Yuguang, Wen Li, Michael Ng, Mingkui Tan, Hanrui Wu, Huaqing Min, and Qingyao Wu. "Learning Discriminative Correlation Subspace for Heterogeneous Domain Adaptation." In Twenty-Sixth International Joint Conference on Artificial Intelligence. California: International Joint Conferences on Artificial Intelligence Organization, 2017. http://dx.doi.org/10.24963/ijcai.2017/454.

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Domain adaptation aims to reduce the effort on collecting and annotating target data by leveraging knowledge from a different source domain. The domain adaptation problem will become extremely challenging when the feature spaces of the source and target domains are different, which is also known as the heterogeneous domain adaptation (HDA) problem. In this paper, we propose a novel HDA method to find the optimal discriminative correlation subspace for the source and target data. The discriminative correlation subspace is inherited from the canonical correlation subspace between the source and target data, and is further optimized to maximize the discriminative ability for the target domain classifier. We formulate a joint objective in order to simultaneously learn the discriminative correlation subspace and the target domain classifier. We then apply an alternating direction method of multiplier (ADMM) algorithm to address the resulting non-convex optimization problem. Comprehensive experiments on two real-world data sets demonstrate the effectiveness of the proposed method compared to the state-of-the-art methods.
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Zhu, Linda, Nathaniel S. Miller, Charlotte Tang, Sriram Pendyala, Quinn Hanses, and Lacie Gladding. "Reliability Check of an Assessment System for Parkinson’s Disease Tremor Monitoring With Portable Devices." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-71144.

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Abstract Tremor, or an involuntary and oscillatory movement of a body part, is a cardinal symptom of Parkinson’s disease (PD) that can significantly impact activities of daily living in people with PD (PwPD). Although tremor can be mitigated with anti-PD medications, medication effectiveness is mixed for PwPD. Therefore, daily monitoring and assessment of tremor are of interest to PwPD, clinicians, and researchers. While several sensors and wearable devices have been developed and introduced to the consumer market, high costs limit their accessibility. The current research is two-fold. First, an assessment system based on multiple algorithms is developed for evaluating the reliability of measurements of PD symptoms: hand tremor and finger/hand movement speed. Second, an Android mobile application was designed and developed to capture finger-tapping frequencies and measurements of several PD symptoms like hand tremor. A healthy young adult participant produced a self-generated tremor for this study. The participant held the portable device and conducted self-measurements by following in-app instructions. Resting tremor was measured while the participant rested his upper extremity on the arm of a chair, postural tremor was measured while he maintained a position against gravity, and kinetic tremor was measured during a movement task. Data collection took approximately fifteen minutes. The linear and rotational motions, respectively, were collected by accelerometers and gyroscopes embedded within the mobile device. The results were captured and delivered to a cloud database. An assessment system with multiple algorithms provided a final evaluation of the participant’s tremor. The process included three parts. First, calculation of root-mean-square (RMS) values at all linear and rotational directions was conducted to provide tremor strength. Second, fast Fourier transform (FFT) extracted the peak frequency at each direction. The powers of peaks were compared and the highest peak was defined as the dominant frequency and that frequency’s corresponding direction of motion. Third, hand and motion correlation analysis was used to find any coherence of tremor on 3-D motions. To test the reliability of motion measurement, the same motion input was applied to multiple devices simultaneously. The outputs of different types of mobile devices were evaluated, while considering various factors and models of mobile devices in the market (i.e., device size, weight, operating system, sampling frequency, and accuracy during the measurement). Multiple trials were conducted to test the reliability of the assessment system and the performance of the mobile app. Additionally, the mobile application supports finger tapping tests that measure hand movement speed, which is commonly impaired in PwPD. Both tremor and movement speed measurements can be used to evaluate disease progression over time and could support focused medication adjustments based on symptom data.
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Hamakawa, Hiromitsu, Yuji Kouno, and Eiichi Nishida. "Effect of Fins on Vortex Shedding Noise Generated From a Circular Cylinder in Cross Flow." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30290.

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In the present paper, the effect of twist-serrated fins around a bare tube on the Aeolian tone was experimentally investigated. These fins were mounted spirally around a bare tube and had the same geometry as those actually used in boiler tubes. We measured the intensity of velocity fluctuation, spectrum of velocity fluctuation, coherence of Karman vortex in the spanwise direction, dynamic lift force, and sound pressure level of the aerodynamic noise generated from finned tubes with various fin pitches. An Aeolian tone induced by Karman vortex shedding was observed in the case of a finned tube, although the complicated fin was mounted around a bare tube. A decrease in the pitch of the fin effectively caused an increase in the equivalent diameter, which acted as the characteristic length of a cylinder with fins. The equivalent diameter depended on the Reynolds number. We modified a relation to calculate the characteristic diameter of the finned tube, which in turn was used to calculate the Strouhal number. The coherent scales in the spanwise direction for the cases with various fin pitches were slightly larger than that of a simple circular cylinder. It is known that the sound pressure level of the Aeolian tone depends on the coherent scale of the Karman vortex in the spanwise direction. However, when the pitch of the fins decreased, the peak level of the sound pressure spectrum decreased. A correlation analysis between the flow field and Aeolian tone was carried out.
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10

Han, Yuxuan, Jiaolong Yang, and Ying Fu. "Disentangled Face Attribute Editing via Instance-Aware Latent Space Search." In Thirtieth International Joint Conference on Artificial Intelligence {IJCAI-21}. California: International Joint Conferences on Artificial Intelligence Organization, 2021. http://dx.doi.org/10.24963/ijcai.2021/99.

Full text
Abstract:
Recent works have shown that a rich set of semantic directions exist in the latent space of Generative Adversarial Networks (GANs), which enables various facial attribute editing applications. However, existing methods may suffer poor attribute variation disentanglement, leading to unwanted change of other attributes when altering the desired one. The semantic directions used by existing methods are at attribute level, which are difficult to model complex attribute correlations, especially in the presence of attribute distribution bias in GAN's training set. In this paper, we propose a novel framework (IALS) that performs Instance-Aware Latent-Space Search to find semantic directions for disentangled attribute editing. The instance information is injected by leveraging the supervision from a set of attribute classifiers evaluated on the input images. We further propose a Disentanglement-Transformation (DT) metric to quantify the attribute transformation and disentanglement efficacy and find the optimal control factor between attribute-level and instance-specific directions based on it. Experimental results on both GAN-generated and real-world images collectively show that our method outperforms state-of-the-art methods proposed recently by a wide margin. Code is available at https://github.com/yxuhan/IALS.
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