• 제목/요약/키워드: Wander

검색결과 53건 처리시간 0.026초

기울기 분석과 굴곡점 검출을 이용한 ECG 기저선 잡음 제거 알고리즘 (ECG Baseline Wandering Removing Algorithm using Slope analysis and Curve Point Detection)

  • 조익성;권혁숭
    • 한국정보통신학회논문지
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    • 제14권9호
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    • pp.2105-2112
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    • 2010
  • 심전도의 잡음 성분은 일정한 주파수대역에 분포하지 않고 측정자의 신체 및 환경조건에 따라서 다양한 형태의 신호로 나타난다. 특히 기저선 변동 잡음은 전극을 부착한 부위의 근육수축과 호흡의 리듬에 따라 0 ~ 2[Hz] 범위의 주파수 성분이 원 신호에 섞여 발생하기 때문에 신호를 분석하는 데 많은 어려움이 있다. 기저선 변동을 제거하기 위한 여러 방법들이 제안되어 왔으나 기존의 방법들은 많은 연산량으로 인한 처리시간이 길어지고 원 신호 성분을 왜곡시키는 문제점이 있다. 따라서 본 논문에서는 원신호의 변형을 줄이고 계산량의 복잡도를 최소화하는 효과적인 기저선 변동 제거 방법을 제안한다. 이는 신호의 기울기를 분석하여 기저선 변동 구간 및 굴곡점을 검출하고, 검출된 구간의 최소값에서 최대값까지를 근사화하여 원 신호에서 이를 감산함으로써 기저선 변동 곡선을 제거하는 방법이다. 제안된 알고리즘의 성능 평가를 위해 MIT-BIH 데이터베이스 101번, 111번, 113번, 234번 레코드 중 기저선이 변동된 신호를 대상으로 0~2[Hz]와 2~40[Hz]의 주파수 대역에서의 평균자승오차를 각각 비교하였다. 실험결과 제안된 방법은 원신호의 왜곡과 계산량의 복잡도를 최소화하여 효과적으로 기저선 변동을 제거하였다.

역전달 신경회로망을 이용한 심전도 파형의 부정맥 분류 (Classification of ECG Arrhythmia Signals Using Back-Propagation Network)

  • 권오철;최진영
    • 대한의용생체공학회:의공학회지
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    • 제10권3호
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    • pp.343-350
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    • 1989
  • A new algorithm classifying ECG Arrhythmia signals using Back-propagation network is proposed. The base-line of ECG signal is detected by high pass filter and probability density function then input data are normalized for learning and classifying. In addition, ECG data are scanned to classify Arrhythmia signal which is hard to find R-wave. A two-layer perceptron with one hidden layer along with error back-propagation learning rule is utilized as an artificial neural network. The proposed algorithm shows outstanding performance under circumstances of amplitude variation, baseline wander and noise contamination.

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세계적 추세에서 본 한국도서관학의 일측면에 대한 논고 (One Aspect of Library Science in Korea with World Trends of Librarianship)

  • 김세익
    • 한국문헌정보학회지
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    • 제1권
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    • pp.103-132
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    • 1970
  • Last twenty years since the introduction of library science as a new scholarship to Korea are considered as a period of imitation and wander. We are supposed to try relevant changes in library education to settle it down and to keep up with world trends in Korea. This paper discusses development and status quo of curricula in foreign countries and tries to show a guide for the library science field in Korea. The writer makes recommendations for the improvement of curricula for Korean library schools.

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자기이상 역산에 의한 마샬제도 북서쪽 세 해저산의 고지자기 해석 (Paleomagnetism of Three Seamounts Northwest of the Marshall Islands from Magnetic Inversion)

  • 이태국;문재운;고영탁;정미숙;김현섭;이기화
    • Ocean and Polar Research
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    • 제26권4호
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    • pp.559-565
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    • 2004
  • Total magnetic field measurements were performed to study paleomagnetism of three seamounts (OSM7, OSM8-1, and OSM8-2) to the northwest of the Marshall Islands in the western Pacific. The study area is located at the Ogasawara Fracture Zone which is a boundary between the Pigafetta and East Mariana basins. The magnetic parameters and paleopoles of three seamounts were derived from inversion of the measured magnetic field. The goodness-of-fit ratio of OSM7 is too low to be included to the estimation of parameters. The complex magnetic anomalies of center, scarcity of flank rift zones and steep slope at OSM7 suggest that the multiple intrusions of magma converge into the center of volcanic edifice. Inclination calculated from the magnetic anomalies of OSM8-1 and OSM8-2 is $-41.2^{\circ}$, and the paleolatitude calculated from the inclination is $23.6^{\circ}S$. The corresponding paleopoles for OSM8-1 and OSM8-2 are $(24^{\circ}42'W,\;48^{\circ}54'N)\;and\;(18^{\circ}18'W,\;48^{\circ}30'N)$, respectively. In comparison with the apparent polar wander path (APWP) of the Pacific plate, the paleopoles are close to 129-Ma pole. The paleopoles and paleolatitudes of OSM8-1 and OSM8-2 suggest that they were formed at similar time and location. The seamounts have drifted northward about $41^{\circ}$ from the paleolatitude to present latitude of seamounts.

청소년의 소진 경험에 관한 연구 -고3 수험생을 중심으로- (A Study Exhaustion Experiences in Adolescents - Samples of 12th Grade Examinees-)

  • 김경희;권혜진;염순교
    • 한국학교보건학회지
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    • 제10권2호
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    • pp.241-257
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    • 1997
  • This study identifies a basic framework to analyze specific experiences of examinees so that which nurses are better able to understand reactions of examinees and, further, to provide better nursing treatments to them. This study follows Strauss & Corbin's analysis tool (1990). This basic framework identifies the specific mental reactions in a process away from the "being tightened" state. The main factors explaining this process include the 28 following variables : anxiety, being burdened, being suppressed, lack of agency, being suffocated, term pressure, expectation pressure, grade pressure, firmness, feebleness, helping others, being disturbed, watching others, off ficiousness, staightening on, depending on, getting along with, getting out of, shooting out, giving up, being alone, devoting, bracing up, being industrious, being harassed, being distressed, troubles, and quiting. Twelve variables are factored from the above factors which include pressure, being tighened, terms, expectations, grades, will, friends, family, open-minded confrontation, close-minded confrontation, pursuing, and wandering around. The Examinees' state of being tightened is first developed, watched by others, and finally resolved causing students either to pursue (positive reactions) or to wander around (negative reactions). Based on the theoretical framework, the following sixteen hypotheses are developed : 1. Students are less tightened in the first term. 2. Students are more tightened in the second term. 3. Students with higher grades feel less tightened. 4. Students with lower grades feel more tightened. 5. Students with higher expectations feel more tightened. 6. Students with lower expectations feel less tightened. 7. Students who are less tightened confront open-mindedly. 8. Students who are higher tightened confront close-mindedly. 9. Students with a strong will confront open-mindedly. 10. Students with a weak will confront close-mindedly. 11. Students who have more sincere friends confront open-mindedly. 12. Students who have less sincere frieds confront close-mindedly. 13. Students with family support confront open-mindedly. 14. Students with little family support confront close-mindedly. 15. Students confronting open-mindedly pursue. 16. Students confronting close-mindedly wander. We identify the following four relations from the data analysis : 1. Students with average grades in their first term are more tightened from high expectations and have a tendency to wander if they have less supporting families even if they also have a strong will and sincere friends. 2. Students with low grades in their second term are less tighened because of low expectations and have a tendency to wander if they have a weak will and few sincere friends even if they have strong family support. 3. Students with high grades in their second term are more tightened with high expectations and have a tendency to pursue confrontations open-mindedly if they have supporting families and a strong will even if they have few sincere friends. 4. Students with average grades in their first term are less tightened from fewer expectations and have a tendency to pursue confrontations open-mindedly when they have more supporting families and sincere friends even if they have a weak will. A Student's degree of being tightened are affected by grades, terms, and expectations. Being tightened is resolved positively or negatively based on will, friends, and family. We conclude that will, family support, and sincere friends cause students to confront "being tightened" open-mindedly. We also conclude that practical nursing for students who are tightened have to focus on creating environments in which students are able to confront open-mindedly.

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Multidimensional Adaptive Noise Cancellation of Stress ECG Signal

  • Gautam, Alka;Lee, Young-Dong;Chung, Wan-Young
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2008년도 춘계종합학술대회 A
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    • pp.285-288
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    • 2008
  • In ubiquitous computing environment the biological signal ECG (Electrocardiogram signal) is usually recorded with noise components. Adaptive interference (or noise) canceller do adaptive filtering of the noise reference input to maximally match and subtract out noise or interference from the primary (signal plus noise) input thereby adaptively eliminate unwanted interference from the ECG signal. Measured Stress ECG (or exercise ECG signal) signal have three major noisy component like baseline wander noise, motion artifact noise and EMG (Electro-mayo-cardiogram) noise. These noises are not only distorted signal but also root of incorrect diagnosis while ECG data are analyzed. Motion artifact and EMG noises behave like wide band spectrum signals, and they considerably do overlapping with the ECG spectrum. Here the multidimensional adaptive method used for filtering which is more effective to improve signal to noise ratio.

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광전송망에서 정상상태 동기클럭 성능 (A Performance Analysis on Steady-state Synchronous Clock in NG-SDH Network)

  • 양충열;고제수;이창기;김환우
    • 한국통신학회논문지
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    • 제32권6B호
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    • pp.305-315
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    • 2007
  • 본 논문에서는 차세대 광전송망의 전송노드와 DOTS에 대해 실제 측정한 클럭잡음 데이터를 기반으로 광전송망 내에서 동기클럭이 정상상태에 있을 때 성능을 분석하고, 이 때 구성가능한 최대 망노드 수준을 제시하였다.

18관절 2족보행 로봇의 안정한 모션제어에 관한연구 (A Study on Stable Motion Control of Biped Robot with 18 Joints)

  • 박문열;;원종범;박성준;김용길
    • 한국산업융합학회 논문집
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    • 제17권2호
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    • pp.35-41
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    • 2014
  • This paper describes the obstacle avoidance architecture to walk safely around in factory and home environment, and presents methods for path planning and obstacle avoidance for the humanoid robot. Solving the problem of obstacle avoidance for a humanoid robot in an unstructured environment is a big challenge, because the robot can easily lose its stability or fall down if it hits or steps on an obstacle. We briefly overview the general software architecture composed of perception, short and long term memory, behavior control, and motion control, and emphasize on our methods for obstacle detection by plane extraction, occupancy grid mapping, and path planning. A main technological target is to autonomously explore and wander around in home environments as well as to communicate with humans.

NG-SDH 시스템을 위한 망동기 설계, 구현 및 동기클럭 모델링 (Design and Implementation of Network Synchronization for NG-SDH System)

  • 양충열;이종현;김환우
    • 한국통신학회논문지
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    • 제30권12A호
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    • pp.1120-1135
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    • 2005
  • 본 논문에서는 120 Gb/s급 NG-SDH 시스템을 위한 망동기장치를 설계 및 구현한다. 그리고 이를 바탕으로 동기클럭 모델링을 통하며 망을 구성하고 있는 NG-SDH 노드클릭의 클럭 특성과 최대노드 수를 도출하는 방법을 제시한다.

물 위에 사는 곤충의 부양과 가라앉음에 관한 연구 (Study on the Floating and Sinking of Insects Living on Water)

  • 이덕규;김호영
    • 대한기계학회논문집B
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    • 제30권10호
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    • pp.982-986
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    • 2006
  • It is well known that the surface tension forces can make a particle denser than water float when the size of the particle is of the order of 1 mm. This is deeply related to the basic mechanism enabling small insects to wander around on the pond surface and also to a newly emerging technology of self-assembly using capillary forces. For the quantitative understanding of this effect, we experimentally study the maximum density of a cylinder that can float on water and how fast the cylinder sinks when the density exceeds the maximum value. We compare our experimental results with the theoretical prediction and find good agreement between them.