• Title/Summary/Keyword: EMA

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The Study of the Financial Index Prediction Using the Equalized Multi-layer Arithmetic Neural Network (균등다층연산 신경망을 이용한 금융지표지수 예측에 관한 연구)

  • 김성곤;김환용
    • Journal of the Korea Society of Computer and Information
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    • v.8 no.3
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    • pp.113-123
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    • 2003
  • Many researches on the application of neural networks for making financial index prediction have proven their advantages over statistical and other methods. In this paper, a neural network model is proposed for the Buying, Holding or Selling timing prediction in stocks by the price index of stocks by inputting the closing price and volume of dealing in stocks and the technical indexes(MACD, Psychological Line). This model has an equalized multi-layer arithmetic function as well as the time series prediction function of backpropagation neural network algorithm. In the case that the numbers of learning data are unbalanced among the three categories (Buying, Holding or Selling), the neural network with conventional method has the problem that it tries to improve only the prediction accuracy of the most dominant category. Therefore, this paper, after describing the structure, working and learning algorithm of the neural network, shows the equalized multi-layer arithmetic method controlling the numbers of learning data by using information about the importance of each category for improving prediction accuracy of other category. Experimental results show that the financial index prediction using the equalized multi-layer arithmetic neural network has much higher correctness rate than the other conventional models.

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CORRELATION BETWEEN BIS-GMA : TEGDMA RATIO AND DEGREE OF CONVERSION IN VARIOUS LAYERS OF COMPOSITE AFTER ADDITIONAL HEAT CURING (수종 복합레진 내의 bis-GMA와 TEGDMA의 구성비가 레진 인레이 법에 의한 부가적 열처리시 복합레진의 표면 및 내부의 중합률 변화에 미치는 영향)

  • Park, Seong-Ho;Chung, Chan-Moon
    • Restorative Dentistry and Endodontics
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    • v.21 no.2
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    • pp.642-651
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    • 1996
  • The purpose of this study was to evaluate the relationship between monomer compositions and the changes in the degree of conversion in the various layers of composites after additional heat curing. Four types of composites and 3 types of inlay ovens were used in this study. Composite was placed in a 4-mm thick teflon mold, and light cured from the top for 60 seconds. Ten samples were prepared for each composite ; 5 of these were additionally heat cured in an inlay oven as the manufacturer recommended. After light curing or light and heat curing, the samples were sectioned into four parts and assigned to groups A, B, C, or D according to their distance from the light source. These sections were then thinned to 50-$70{\mu}m$, and these wafers were analyzed with a Fourier Transform Infrared Spectrometer(FI-IR) to determine the degree of conversion. A standard baseline technique was used to calculate the degree of conversion. $^{13}C$ NMR spectra of bis-GMA, TEGDMA and bis-EMA, were acquired using a Varian Gemini spectrometer operated at 200 MHz. $CDCl_3$ solvent was used for qualitative analysis. The degree of conversion was affected by bis-GMA : TEGDMA ratio but it seemed to be also affected by other factors. When the composites were heat cured, significant increases in the degree of conversion were noted throughout the samples, but the amount of increase differed between materials. Thus, clinical performance of a heat-treated composite inlay may be different depending on materials.

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Hydrograph Separation Using EMMA Model for the Coniferous Forest Catchment in Gwangneung Gyeonggido, Republic of Korea (I) - Determination of the End Members and Tracers -

  • Kim, Kyongha;Yoo, Jae-Yun;Jun, Jae-Hong;Choi, Hyung Tae;Jeong, Yong-Ho
    • Journal of Korean Society of Forest Science
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    • v.95 no.5
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    • pp.556-561
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    • 2006
  • This study was conducted to choose end-members and tracers for application of End Member Mixing Analysis (EMMA) model for the coniferous forest catchment, Gwangneung Gyeongi-do near Seoul metropolitan of South Korea (N $37^{\circ}$ 45', E $127^{\circ}$ 09'). This coniferous forest of Pinus Korainensis and Abies holophylla was planted at stocking rate of $3.0stems\;ha^{-1}$ in 1976. Thinning and pruning were carried out two times in the spring of 1996 and 2004 respectively. We monitored two successive rainfall events during ten days from June 26, 205 to July 5, 2005. Two storm events were selected to determine the end members and natural traces for hydrograph separation. The event 1 amounts to 161.9 m for two days from June 26 to 27, 2005. The event 2 precipitates to 139.2 mm for one day of July 1, 205. Throughfall, groundwater, soil water and stream water of the two events above were sampled through the bulk and automatic sampler. Their chemical properties were analyzed for prediction of the main tracer. The end members that contribute to the stream runoff were identified from the three components including groundwater, soil water and throughfall. Each component and stream water in the two events formed the suitable mixing diagram in case of chloride-nitrate ion and sulfate-potassium ion. Especially, chloride-nitrate ion was found to be the most suitable tracers for EMMA model in the two events.

Passive 3D motion optical data in shaking table tests of a SRG-reinforced masonry wall

  • De Canio, Gerardo;de Felice, Gianmarco;De Santis, Stefano;Giocoli, Alessandro;Mongelli, Marialuisa;Paolacci, Fabrizio;Roselli, Ivan
    • Earthquakes and Structures
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    • v.10 no.1
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    • pp.53-71
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    • 2016
  • Unconventional computer vision and image processing techniques offer significant advantages for experimental applications to shaking table testing, as they allow the overcoming of most typical problems of traditional sensors, such as encumbrance, limitations in the number of devices, range restrictions and risk of damage of the instruments in case of specimen failure. In this study, a 3D motion optical system was applied to analyze shake table tests carried out, up to failure, on a natural-scale masonry structure retrofitted with steel reinforced grout (SRG). The system makes use of wireless passive spherical retro-reflecting markers positioned on several points of the specimen, whose spatial displacements are recorded by near-infrared digital cameras. Analyses in the time domain allowed the monitoring of the deformations of the wall and of crack development through a displacement data processing (DDP) procedure implemented ad hoc. Fundamental frequencies and modal shapes were calculated in the frequency domain through an integrated methodology of experimental/operational modal analysis (EMA/OMA) techniques with 3D finite element analysis (FEA). Meaningful information on the structural response (e.g., displacements, damage development, and dynamic properties) were obtained, profitably integrating the results from conventional measurements. Furthermore, the comparison between 3D motion system and traditional instruments (i.e., displacement transducers and accelerometers) permitted a mutual validation of both experimental data and measurement methods.

Design and Performance Test of 10,000 lbf-in Class Dual Redundant Hinge Line Electro-Mechanical Actuator System (10,000 lbf-in급 힌지라인 이중화 전기식 구동장치 설계 및 성능평가)

  • Jeong, Seuhg-Ho;Seol, Jin-Woon;Heo, Seok-Haeng;Lee, Byung-Ho;Cho, Young-Ki
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.47 no.2
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    • pp.153-160
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    • 2019
  • Electro-mechanical actuator system for aircraft has advantages in compactness and its lightweight, compared to the hydraulic actuator system. Hinge line actuator has low air resistance and is suitable for special purpose such as stealth. This paper describes design contents of 10,000 lbf-in class dual redundant hinge line electro-mechanical actuator system for performance test. The control structure was designed to minimize impact of torque fighting. A mathematical model is proposed to analyze and validate the performances of actuator by comparison with experiment results.

The effect of progeny numbers and pedigree depth on the accuracy of the EBV with the BLUP method

  • Jang, Sungbong;Kim, So Yeon;Lee, Soo-Hyun;Shin, Min Gwang;Kang, Jimin;Lee, Dooho;Kim, Sidong;Noh, Seung Hee;Lee, Seung Hwan;Choi, Tae Jeong
    • Korean Journal of Agricultural Science
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    • v.46 no.2
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    • pp.293-301
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    • 2019
  • This study was done to estimate the effect of progeny numbers and pedigree depth on the accuracy of the estimated breeding value (EBV) using best linear unbiased prediction (BLUP) method in Hanwoo. The experiment groups (sire = 100, 200, and 300; progeny = 4 and 8) were made by random sampling and by genetic evaluation of the following traits: Body weight (BW), carcass weight (CW), eye muscle area (EMA), back fat thickness (BFT) and marbling score (MS9). As a result of the genetic evaluation, the accuracy of the EBV was roughly 30 - 60% with 4 progenies, and the accuracy of the EBV increased by about 50 - 75% with 8 progenies. In the other words, when the number of progenies increased from 4 to 8, the accuracy of the EBV simultaneously increased by about 15 - 20%. Moreover, when the number of sires was higher, variations in the accuracy of the EBV within the groups for each trait decreased. Therefore, this result indicates that not only the number of progeny but also the number of sires can affect the accuracy of the EBV. Consequently, collecting information on the progeny and careful management of that information are very important things in the Hanwoo breeding system. Therefore, the EBV can show more precise results when conducting genetic evaluations.

Inhibition of Pathogenic Bacteria and Fungi by Natural Phenoxazinone from Octopus Ommochrome Pigments

  • Lewis-Lujan, Lidianys Maria;Rosas-Burgos, Ema Carina;Ezquerra-Brauer, Josafat Marina;Burboa-Zazueta, Maria Guadalupe;Assanga, Simon Bernard Iloki;del Castillo-Castro, Teresa;Penton, Giselle;Plascencia-Jatomea, Maribel
    • Journal of Microbiology and Biotechnology
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    • v.32 no.8
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    • pp.989-1002
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    • 2022
  • Cephalopods, in particular octopus (Octopus vulgaris), have the ability to alter their appearance or body pattern by showing a wide range of camouflage by virtue of their chromatophores, which contain nanostructured granules of ommochrome pigments. Recently, the antioxidant and antimicrobial activities of ommochromes have become of great interest; therefore, in this study, the pH-dependent redox effect of the extraction solvent on the antioxidant potential and the structural characterization of the pigments were evaluated. Cell viability was determined by the microdilution method in broth by turbidity, MTT, resazurin, as well as fluorescence microscopy kit assays. A Live/Dead Double Staining Kit and an ROS Kit were used to elucidate the possible inhibitory mechanisms of ommochromes against bacterial and fungal strains. The results obtained revealed that the redox state alters the color changes of the ommochromes and is dependent on the pH in the extraction solvent. Natural phenoxazinone (ommochromes) is moderately toxic to the pathogens Staphylococcus aureus, Bacillus subtilis, Salmonella Typhimurium and Candida albicans, while the species Pseudomonas aeruginosa and Pseudomonas fluorescens, and the filamentous fungi Aspergillus parasiticus, Alternaria spp. and Fusarium verticillioides, were tolerant to these pigments. UV/visible spectral scanning and Fourier- transform infrared spectroscopy (FTIR) suggest the presence of reduced ommatin in methanol/ HCl extract with high intrinsic fluorescence.

A preliminary study on laryngeal and supralaryngeal articulatory distinction of the three-way contrast of Korean velar stops

  • Jiyeon Song;Sahyang Kim;Taehong Cho
    • Phonetics and Speech Sciences
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    • v.15 no.1
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    • pp.19-24
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    • 2023
  • This study investigated acoustic (VOT) and articulatory characteristics of Korean velar stops in monosyllabic CV structures to examine how the three-way distinction is realized in the laryngeal and supralaryngeal domains and how the distinction is manifested in male versus female speakers' speech production. EMA data were collected from 22 speakers. In line with previous studies, male speakers preserved the three-way differentiation of velar stops (/k*/</k/</kh/) in terms of VOT while female speakers showed only a two-way distinction (/k*/</k/=/kh/). As for the kinematic characteristics, a clear three-way distinction was found only in male speakers' peak velocity measure in the C-to-V opening movement (/kh/</k/</k*/). For the other kinematic measures (i.e., articulatory closure duration, deceleration duration of the opening movement and the entire opening movement duration), male speakers showed only a two-way distinction between fortis and the other two stops. Female speakers did not show a three-way contrast in any kinematic measure. They showed a two-way distinction between lenis and the other two stops in C-to-V deceleration duration (/k*/=/kh/</k/), and a two-way distinction between fortis and lenis stops in the opening movement duration. An overall comparison of VOT and articulatory analyses revealed that the lenis-aspirated kinematic distinction is diminishing, driven by female speakers, in line with the loss of the lenis-aspirated distinction in VOT that could influence supralaryngeal articulation.

Disturbance Observer and Time-Delay Controller Design for Individual Blade Pitch Control System Driven by Electro-Mechanical Actuator (전기-기계식 구동기 기반 개별 블레이드 피치 조종 시스템의 제어를 위한 외란 관측기와 시간 지연제어기 설계)

  • Jaewan Choi;Minyu Kim;Younghoon Choi
    • Journal of Aerospace System Engineering
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    • v.18 no.1
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    • pp.29-36
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    • 2024
  • Recently, the concept of Urban Air Mobility (UAM) has expanded to Advanced Air Mobility (AAM). A tilt rotor type of vertical take-off and landing aircraft has been actively studied and developed. A tilt-rotor aircraft can perform a transition flight between vertical and horizontal flights. A blade pitch angle control system can be used for flight stability during transition flight time. In addition, Individual Blade Control (IBC) can reduce noise and vibration generated in transition flight. This paper proposed Disturbance Observer Based Control (DOBC) and Time Delay Control (TDC) for individual blade control of an Electro-Mechanical Actuator (EMA) based blade pitch angle control system. To compare and analyze proposed controllers, numerical simulations were conducted with DOBC and TDC.

Association between Genotypes of the Isocitrate Dehydrogenase 3, beta subunit (IDH3B) Gene and Carcass Traits in an F2 Crossbred Population of Landrace × Jeju (Korea) Black Pigs (제주흑돼지와 랜드레이스 교배 2세대의 도체형질과 IDH3B 유전자형의 상관관계)

  • Kang, Yong-Jun;Jeong, Dong Kee;Cho, In-Cheol;Han, Sang-Hyun
    • Journal of Life Science
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    • v.26 no.4
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    • pp.414-418
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    • 2016
  • This study tested the association between genetic polymorphisms of the isocitrate dehydrogenase 3, beta subunit (IDH3B) gene and economic traits in an F2 crossbred population of Landrace × Jeju (South Korea) Black pigs. A 304-bp insertion/deletion mutation in promoter region was screened for determining genotypes of the IDH3B gene in a total of 1,105 F2 pigs. Three genotypes (AA, AB, and BB) were identified in the founder, F1, and F2 populations. Association analysis showed significant differences in carcass weights (CW), backfat thicknesses in three positions of the body (4th-5th ribs, BF5; 11th-12th ribs, BF12; 13th rib-1st lumbar, BFL), and carcass lengths (CL) (p<0.05), but not in meat color (MC), eye muscle area (EMA), or marbling scores (MARB) (p>0.05). The F2 IDH3B BB homozygotes showed heavier CW (80.790±0.725 kg) and shorter CL (101.875±0.336 cm) than the other genotypes (p<0.05). In addition, the BF levels between the 4th - 5th and 11th - 12th vertebrae were thicker in the carcasses of pigs with the IDH3B BB genotype than with the other genotypes (p<0.05). These results suggested that genetic variations in the IDH3B gene may serve as molecular genetic markers for improving the Landrace × Jeju Black pig crossbreeding systems.