• 제목/요약/키워드: Frequency focusing

검색결과 913건 처리시간 0.024초

고배속 광디스크 적용을 위한 외란 관측기 설계 (Disturbance Observer Design for a High Speed Optical Disk Drive)

  • 이주상;최진영;박노철;양현석;박영필
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2003년도 춘계학술대회논문집
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    • pp.1170-1175
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    • 2003
  • Recently, the disturbance caused by an optical disk vibration and the external vibration/shock are more serious problem in an optical disk drives (ODD) as an ODD become small size and rotation speed increases. The conventional controller cannot cope with the mentioned problems properly when the disturbance and vibration are larger than some range. Therefore, we propose a new control scheme using a disturbance observer (DOB) and it can control the aforementioned problems. The designed the controller is applied to a commercial ODD in focusing direction, then its validity is proved by experimental method. By rising the disturbance observer theory, the focusing performance is conspicuously improved in the presence of sinusoidal vibrations or a shock disturbance. This algorithm also applies to a tracking structure also, because focusing structure is very similar to it.

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컴퓨터 비젼 및 자동초점장치를 이용한 크레이타 마멸측정 (Crater Wear Measurement Using Computer Vision and Automatic Focusing)

  • 양민양;권오달
    • 대한기계학회논문집A
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    • 제20권12호
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    • pp.3759-3766
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    • 1996
  • In this paper a new gefchmique to measaure the creater wear using image processing and automatic focusing is presented. The contour detection algorithm, which can adopt ina noisy image, is suggested. It is suitable for eliminating high frequency noses with lower processing time and without blurring. An automatic focusing technique is applied to measure a createrwear depth with a one-dimensional search algorithm for finding the bestfocus. This method is implemented in the tool microscope driven by a servo motor. The results show that the countour and depth of crater wear can be measured reliably.

키워드 빈도 및 중심성 분석 기반의 머신러닝 헬스케어 연구 동향 : 미국·영국·한국을 중심으로 (Research Trend on Machine Learning Healthcare Based on Keyword Frequency and Centrality Analysis : Focusing on the United States, the United Kingdom, Korea)

  • 이택균
    • 디지털산업정보학회논문지
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    • 제19권3호
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    • pp.149-163
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    • 2023
  • In this study we analyze research trends on machine learning healthcare based on papers from the United States, the United Kingdom, and Korea. In Elsevier's Scopus, we collected 3425 papers related to machine learning healthcare published from 2018 to 2022. Keyword frequency and centrality analysis were conducted using the abstracts of the collected papers. We identified keywords with high frequency of appearance by calculating keyword frequency and found central research keywords through the centrality analysis by country. Through the analysis results, research related to machine learning, deep learning, healthcare, and the covid virus was conducted as the most central and highly mediating research in each country. As the implication, studies related to electronic health information-based treatment, natural language processing, and privacy in Korea have lower degree centrality and betweenness centrality than those of the United States and the United Kingdom. Thus, various convergence research applied with machine learning is needed for these fields.

A Sub-Wavelength Focusing Lens Composed of a Dual-Plate Metamaterial Providing a Negative Refractive Index

  • Kim, Dong-Ho
    • Journal of electromagnetic engineering and science
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    • 제12권1호
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    • pp.26-31
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    • 2012
  • We have proposed a metamaterial lens that enables sub-wavelength focusing, which is shorter than an operating wavelength. Our lens is a two dimensional array of a unit cell consisting of a metallic dual-plate printed on a dielectric substrate. The unique dual-plate structure provides negativeness both in permittivity and permeability, with no help from conventional additional structures, which are normally printed on the opposite of metallic patterns. Therefore, we can focus a source (or an image) in a tiny distance shorter than the free space wavelength (${\lambda}$) at the frequencies of interest. Furthermore, since the proposed geometry does not need separate supplementary structures to acquire negative permittivity or permeability, our lens is much simpler than conventional metamaterial lenses, which is a strong point in practical applications. We have validated sub-wavelength focusing ability in a 6 GHz frequency band through an experiment of near field scanning, which provided the width of about 0.19 ${\lambda}$ at a half maximum of a peak value of an measured image. The width of the focused image through the lens is more than 4 times shorter than that without the lens, which confirms the validity of our design approach.

Laboratory study on the modulation evolution of nonlinear wave trains

  • Dong, G.H.;Ma, Y.X.;Zhang, W.;Ma, X.Z.
    • Ocean Systems Engineering
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    • 제2권3호
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    • pp.189-203
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    • 2012
  • New experiments focusing on the evolution characteristics of nonlinear wave trains were conducted in a large wave flume. A series of wave trains with added sidebands, varying initial steepness, perturbed amplitudes and frequencies, were physically generated in a long wave flume. The experimental results show that the increasing wave steepness, increases the speed of sidebands growth. To study the frequency and phase modulation, the Morlet wavelet transform is adopted to extract the instantaneous frequency of wave trains and the phase functions of each wave component. From the instantaneous frequency, there are local frequency downshifts, even an effective frequency downshift was not observed. The frequency modulation increases with an increase in amplitude modulation, and abrupt changes of instantaneous frequencies occur at the peak modulation. The wrapped phase functions show that in the early stage of the modulation, the phase of the upper sideband first diverges from that of the carrier waves. However, at the later stage, the discrepancy phase from the carrier wave transformed to the lower sideband. The phase deviations appear in the front of the envelope's peaks. Furthermore, the evolution of the instantaneous frequency exhibits an approximate recurrence-type for the experiment with large imposed sidebands, even when the corresponding recurrence is not observed in the Fourier spectrum.

Consistency of PPP GPS and strong-motion records: case study of Mw9.0 Tohoku-Oki 2011 earthquake

  • Psimoulis, Panos;Houlie, Nicolas;Meindl, Michael;Rothacher, Markus
    • Smart Structures and Systems
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    • 제16권2호
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    • pp.347-366
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    • 2015
  • GPS and strong-motion sensors are broadly used for the monitoring of structural health and Earth surface motions, focusing on response of structures, earthquake characterization and rupture modeling. Several studies have shown the consistency of the two data sets within at certain frequency (e.g., 0.03

Image Enhancement for Sub-Harmonic Phased Array by Removing Surface Wave Interference with Spatial Frequency Filter

  • Park, Choon-Su;Kim, Jun-Woo;Cho, Seung Hyun;Seo, Dae-Cheol
    • 비파괴검사학회지
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    • 제34권3호
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    • pp.211-219
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    • 2014
  • Closed cracks are difficult to detect using conventional ultrasonic testing because most incident ultrasound passes completely through these cracks. Nonlinear ultrasound inspection using sub-harmonic frequencies a promising method for detecting closed cracks. To implement this method, a sub-harmonic phased array (PA) is proposed to visualize the length of closed cracks in solids. A sub-harmonic PA generally consists of a single transmitter and an array receiver, which detects sub-harmonic waves generated from closed cracks. The PA images are obtained using the total focusing method (TFM), which (with a transmitter and receiving array) employs a full matrix in the observation region to achieve fine image resolution. In particular, the receiving signals are measured using a laser Doppler vibrometer (LDV) to collect PA images for both fundamental and sub-harmonic frequencies. Oblique incidence, which is used to boost sub-harmonic generation, inevitably produces various surface waves that contaminate the signals measured in the receiving transducer. Surface wave interference often degrades PA images severely, and it becomes difficult to read the closed crack's position from the images. Various methods to prevent or eliminate this interference are possible. In particular, enhancing images with signal processing could be a highly cost-effective method. Because periodic patterns distributed in a PA image are the most frequent interference induced by surface waves, spatial frequency filtering is applicable for removing these waves. Experiments clearly demonstrate that the spatial frequency filter improves PA images.

The Relationship Between Frequency of Injuries and Workplace Environment in Korea: Focus on Shift Work and Workplace Environmental Factors

  • Kim, Jongwoo
    • Safety and Health at Work
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    • 제9권4호
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    • pp.421-426
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    • 2018
  • Background: The purpose of this study was to investigate the effect of shift work on occupational safety in various industrial sectors. The study analyzes the effects of shift work on the health of workers by considering factors such as the workplace environment and welfare. Methods: Focusing on the $4^{th}$ Korean Working Conditions Survey, this study used an ordinary least-square multiple regression analysis. The dependent variable was the annual frequency of injuries reported by workers. Independent variables were categorized as demographic, shift work, workplace environment, and welfare variables. The analysis was conducted on two levels: 1) Shift work and nonshift work groups were compared, and 2) Shift work was compared with fixed and rotating shifts. Results: For the entire group, age, a low level of education, work hours, and daily and dispatch work negatively impacted the frequency of injuries. Shift work was negatively affected by workplace environment and welfare factors. In the shift group, the frequency of injuries was lower than that of regular workers, and the higher the autonomy in the choice of work hours, the lower the frequency of injuries. Furthermore, shift workers in Korea have more extended work hours (49.25 h/week) than other workers (46.34 h/week). Conclusion: Overall, welfare factors such as workplace satisfaction and worke-life balance reduced the frequency of injuries. The effect of shift work was limited, but it was confirmed that shift worker autonomy could reduce the frequency of injuries.

Chebyshev BPF와 종속 Chebyshev BPF의 리플-천이대역 Trade-offs (Trade-offs Between the Ripple and the Transition Band for the Chebyshev BPF and the Cascading Chebyshev BPF)

  • 신승식;유치형
    • 전기학회논문지
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    • 제67권2호
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    • pp.255-260
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    • 2018
  • This study is focusing on the trade-offs between the passband ripples and transition bands of the Chebyshev BPF, which is converted by using the Chebyshev LPF that is well known as a proto-type analog filter. It is also focusing on the trade-offs between the passband ripples and transition bands of the cascading Chebyshev BPF, as well as, the trade-offs between the two BPFs. The study finds the frequency responses of the proto-type analog LPF, the Chebyshev BPF and the cascading Chebyshev BPF. The study shows the results as comparative analysis tables. The study designs the 10th Chebyshev BPF in order to analyze it easily. The simulation results show that the Chebyshev BPF decreases about 55% of the transition band for the -2.5[dB] passband ripple comparing to the -0.5[dB] passband ripple. This study shows the effectiveness and economic feasibility in the restricted frequency communication environment for the decrease of the transition band as providing the passband ripple margin.

의류제품의 인터넷 구매 후 행동에 관한 연구 - 불만족 요인과 불평 행동을 중심으로 - (Consumer Post-Purchasing Behavior of Internet Shopping - Focusing on Dissatisfaction and Complaint Behavior -)

  • 박수경;조남혜
    • 복식문화연구
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    • 제18권2호
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    • pp.217-228
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    • 2010
  • The purpose of this study was to examine the post-purchasing behavior focusing on dissatisfaction and complaint behavior. There were some studies concerning dissatisfaction in on-line shopping related to satisfaction and intention to re-buying, but did not focus the relationship with complaint behavior, or identified the factors specifically related to consumer's dissatisfaction. In this study, it was examined to minimize the consumer's dissatisfaction and complaint behavior by investigating the detailed factors relating dissatisfactions and complaint behaviors after shopping apparel goods on the internet. Two hundred fifty five customers who had purchased fashion products in internet shopping had participated in this study. The data was analyzed by factor analysis, regression analysis using SPSS program. As the result, first, product, delivery, returning and price factor were extracted as factors of dissatisfaction, and as factors of complaint behavior, legal action, private action, remedial action were investigated. Second, dissatisfaction was significantly effected on complaint behavior. Specially, returning factor and price factor had effect on legal action, product, delivery factor had on private action and returning factor had affected remedial action. Third, more purchasing frequency, less dissatisfaction. Also, female had more dissatisfaction than male. Finally, more dissatisfaction and compliant behavior, less repurchasing intention. Based on these results, internet shopping fashion marketing strategies were suggested.