• 제목/요약/키워드: Morphology-pair

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Morphology-pair 연산과 중간 값을 이용한 심전도 신호의 기저선 변동 잡음 제거 (Removing Baseline Drift in ECG Signal using Morphology-pair Operation and median value)

  • 박길흠;김정홍
    • 한국컴퓨터정보학회논문지
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    • 제19권8호
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    • pp.107-117
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    • 2014
  • 본 논문에서는 심전도 파형에서 P, R, T-wave와 같은 local maxima 신호 영역과 Q, S-wave와 같은 local minima 신호영역을 제거하여 기저선 변동 잡음을 제거하기 위한 방법을 제시한다. 이를 위해 형태연산을 개선한 morphology-pair 연산을 심전도 파형에 적용하고, 그 결과 발생되는 돌출 파형을 제거하고자 중간 값 연산을 적용하였다. 제안한 알고리즘의 성능을 확인하기 위해 실제 심전도 임상 데이터인 MIT/BIH 데이터베이스를 이용하였으며, 실험 결과 원 신호를 왜곡 하지 않고, 기저선 변동 잡음을 효과적으로 제거함을 확인하였다.

Morphology-pair를 이용한 심전도 신호의 기저선 변동 잡음 제거 알고리즘 (Minimizing Algorithm of Baseline Wander for ECG Signal using Morphology-pair)

  • 김성완;김세윤;김태훈;최병재;박길흠
    • 한국지능시스템학회논문지
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    • 제20권4호
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    • pp.574-579
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    • 2010
  • 심전도 신호 잡음 중 기저선 변동 잡음은 신뢰성 있는 심장 질환 진단을 위해 반드시 제거되어야 하는 것으로서, 이를 위해 본 논문에서는 P, T파 및 QRS-complex를 동시에 배제하여 기저선 변동 잡음만을 추정할 수 있는 Morphology-pair를 제안한다. 즉, P, R, T파와 같은 국부 최대값(local maxima) 특성을 가지는 신호 영역과 Q, S파와 같은 국부 최소값(local minima) 특성을 가지는 신호 영역을 배제할 수 있는 각각의 Morphology 연산을 하나의 Morphology-pair로 정의하고, 이를 이용하여 추정된 기저선 변동 잡음 신호와 원 신호와의 차를 통해 기저선 변동 잡음 제거 신호를 도출한다. 제안한 알고리즘의 유효성을 확인하기 위해 실제 심전도 임상 데이터인 MIT/BIH 데이터베이스를 이용한 실험 결과를 살펴봄으로써 기저선 변동 잡음이 효과적으로 제거됨을 입증한다.

A study of a tidally interacting BCD pair, ESO 435-IG20 and ESO 435-IG16

  • Kim, Jinhyub;Sung, Eon-Chang;Chung, Aeree
    • 천문학회보
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    • 제39권1호
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    • pp.44.1-44.1
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    • 2014
  • Blue Compact Dwarf galaxies (BCDs) are systems that recently have experienced the burst of star formation. As one of the causes for active star formation in BCDs, tidal interaction (fly-by or merger) has been suggested. A pair of BCDs, ESO 435-IG20 and ESO 435-IG16 are separated by only ~80 kpc in projection at a similar redshift (at a ~9 Mpc distance), and hence suspected to be a good example of such case. Intergalactic atomic hydrogen gas found in HIPASS survey is also suggestive of this hypothesis. In this study, we probe the HI morphology and kinematics of this BCD pair using ATCA HI data to study detailed interaction history. We investigate various star formation tracers of the pair to study how responsible tidal interaction is for triggering star formation in these galaxies.

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A Multi-wavelength Study of a Pair of Interacting BCDs: ESO 435-IG20 and ESO 435-IG16

  • Kim, Jinhyub;Chung, Aeree;Sung, Eon-Chang;Staveley-Smtih, Lister
    • 천문학회보
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    • 제39권2호
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    • pp.49-49
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    • 2014
  • Blue Compact Dwarf galaxies (BCDs) are low-mass galaxies with recently enhanced star formation activity. Since the discovery of old stellar population in the BCDs, a number of hypotheses have been suggested as the origin of the current active star formation. One theory is tidal interactions such as fly-by and merger. In this study we test this hypothesis using a pair of BCDs, ESO 435-IG20 and ESO 435-IG16 that are separate by only ~80 kpc in projection at a similar redshift (at a ~9 Mpc distance). In the HIPASS survey, intergalactic atomic hydrogen envelope has been found to be covering both galaxies, making the pair a good candidate for the case where the star formation has been triggered by tidal interaction. We probe the gas morphology and kinematics of the BCD pair using ATCA HI data in order to find the evidence of tidal interaction. We also estimate star formation rates in the pair based on Ha emission and UV continuum, and compare with other dwarf galaxies to investigate how responsible the tidal interaction is for the enhanced star formation in this case.

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An HI study of a tidally interacting BCD pair, ESO 435-IG20 and ESO-IG16

  • Kim, Jinhyub;Sung, Eon-Chang;Chung, Aeree
    • 천문학회보
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    • 제38권2호
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    • pp.50.1-50.1
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    • 2013
  • Blue Compact Dwarf galaxies (BCDs) are systems which have been experiencing the bursts of star formation in their central region. As one of the origins of active star formation, tidal interaction (merger or fly-by between dwarf galaxies) has been suggested. A pair of BCDs, ESO 435-IG20 and ESO 435-IG16, are suspected to be a good example of such case. They are located at a similar redshift and separated only by ~130 kpc at their distances. In addition a bridge-like HI structure has been found between these two BCDs in the HIPASS survey. In this study, using the ATCA HI data of a much better resolution, we probe the gas morphology and kinematics of individual galaxies. We discuss how tidal interaction is responsible for the high star formation rate in this BCD pair.

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Ultrastrucure of Germ Cells during Spermatogenesis and Some Characteristics of Sperm Morphology in Male Mytilus coruscus (Bivalvia: Mytilidae) on the West Coast of Korea

  • Kim, Jin-Hee;Chung, Ee-Yung;Choi, Ki-Ho;Park, Kwan-Ha;Park, Sung-Woo
    • 한국패류학회지
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    • 제26권1호
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    • pp.33-43
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    • 2010
  • The ultrastructure of germ cells during spermatogenesis and some characteristics of sperm morphology in male Mytilus coruscus, which was collected on the coastal waters of Gyeokpo in western Korea, were investigated by transmission electron microscope observations. The morphology of the spermatozoon has a primitive type and is similar to those of other bivalves in that it contains a short midpiece with five mitochondria surrounding the centrioles. The morphologies of the sperm nucleus type and the acrosome shape of this species have an oval and modified cone shape, respectively. In particular, the axial rod is observed between the nucleus and acrosome of the sperm. The spermatozoon is approximately $45-50{\mu}m$ in length including a sperm nucleus (about $1.46{\mu}m$ in length), an acrosome (about $3.94{\mu}m$ in length) and tail flagellum (approximately $40-45{\mu}m$). The axoneme of the sperm tail flagellum consists of nine pairs of microtubules at the periphery and a pair at the center. The axoneme of the sperm tail shows a 9+2 structure. Some special charateristics of sperm morphology of this species in the genus Mytilus are (1) acrosomal morphology, (2) the number of mitochondria in the midpiece of the sperm, and (3) the existence of a satellite. The axial rod appears in the acrosome and sperm nucleus as one of the characteristics seen in several species of the subclass Pteriomorphia, unlikely the subclass Heterodonta containing axial filament instead of the axial rod. The number of mitochondria in the midpiece of the sperm of this species in the family Mytilidae are five, as one of common characteristics appeared in most species in the family Mytilidae. Most of Mytilus species contain a satellite body which is attached to the proximal centriole in the middle piece of the sperm, as one of common characteristics of sperm morphology in the family Mytilidae.

Two Newly Recorded Species of the Genus Elaphognathia (Crustacea, Isopoda, Gnathiidae) from Korean Waters

  • Kim, Sung Hoon;Yoon, Seong Myeong
    • Animal Systematics, Evolution and Diversity
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    • 제35권3호
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    • pp.123-135
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    • 2019
  • Elaphognathia monodi (Gurjanova, 1936) and Elaphognathia kikuchii Nunomura, 1992 are newly reported based on the materials collected from Wando Island and Jeju Island in Korea, respectively. Elaphognathia monodi is distinguished by the following characteristics: the lateral margin of the cephalon is narrowing posteriorly; the frontal border is slightly concave and has a small mediofrontal process, a pair of superior frontolateral processes, and a pair of inferior frontolateral processes. Elaphognathia kikuchii can be distinguished by the following characteristic features: the lateral margin of the cephalon is narrowing anteriorly; the frontal border has a small mediofrontal process and twelve pairs of simple setae along with concavity.

The uncertainty of age measurements in Globular Clusters by the variations of the 2$^{nd}$ parameter candidates

  • Han, Sang-Il;Lee, Young-Wook
    • 한국우주과학회:학술대회논문집(한국우주과학회보)
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    • 한국우주과학회 2004년도 한국우주과학회보 제13권1호
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    • pp.89-89
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    • 2004
  • It is believed that age controls horizontal-branch (HB) morphology of Globular Clusters besides metallicity (first parameter). However, other second parameter candidates, such as He abundance and alpha elements enhancement, could also affect HB morphology. These effects may influence to the age measurements from the main-sequence turnoff (MSTO) as well. We will measure the variations of age caused by each second parameter candidate at HB and MSTO respectively, using the well known second parameter pair M3 and Ml3. (omitted)

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Pd-black 촉매금속 이용한 고성능 MISFET 형 수소센서 (MISFET type H2 sensor using pd-black catalytic metal gate for high performance)

  • 강기호;조용수;한상도;최시영
    • 센서학회지
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    • 제15권2호
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    • pp.90-96
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    • 2006
  • We have fabricated the Pd-blck/NiCr gate MISFET-type $H_2$ sensor to detect the hydrogen in atmosphere. A differential pair-type structure was used to minimize the intrinsic voltage drift of the MISFET. The Pd-black film was deposited in the argon environment by thermal evaporation. In order to eliminate the blister formation in the surface of the hydrogen sensing gate metal, Pd-black/NiCr double metal layer was deposited on the gate insulator. The scanning electron microscopy and the auger electron spectroscopy was used to analyze their surface morphology and basic structure. The Pd-black/NiCr gate MISFET has been shown high sensitivity and stability more than Pd-planar/NiCr gate MISFET.

Fine Structure of the Mouthparts in the Ambrosia Beetle Platypus koryoensis(Coleoptera: Curculionidae: Platypodinae)

  • Moon, Myung-Jin;Park, Jong-Gu;Kim, Kyung-Hee
    • Animal cells and systems
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    • 제12권2호
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    • pp.101-108
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    • 2008
  • Recently, Platypus koryoensis has been reported as a major pest of oak trees in Korea which can introduce the pathogenic fungus(Raffaelea sp.) by making galleries into the heartwood of the tree. As the beetle has developed its effective drilling mouthpart enough to make tunnels, we have analyzed the fine structural aspects of the mouthpart using the field emission scanning electron microscopy(FESEM) to reveal its mechano-dynamic characteristics. The mouthparts of this ambrosia beetle which consist of a labrum, a pair of mandibles, a pair of maxillae and the labium exhibit typical morphology of mycophagous coleopteran beetles and have those characteristics of chewing mouthparts that can excavate galleries in the hardwood. Both of maxillary and labial palpi have the functions of direct the food to the mouth and hold it while the mandibles chew the food. The distal ends of these palpi are flattened and have shovel-like setae. Females have larger maxillary palpi and a larger gular region than males in general.