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  1. AU="Choi, Hyunho"
  2. AU="Jayaprakash, Balamuralikrishna"
  3. AU="Lee, Brian H"
  4. AU="May, Susann"
  5. AU="Remondes-Costa, Sónia"
  6. AU="Lauren Sauer"
  7. AU="G Saiz, Paula"
  8. AU="Stoica, George"
  9. AU=Odorizzi Pamela M.
  10. AU=Pollaers Katherine
  11. AU="Stefanova, Veselina"
  12. AU="Geraldine M. O’Connor"
  13. AU="Jim E. Banta"
  14. AU="Marti-Bonmati, Luis"
  15. AU="Doris Kampner"
  16. AU="Luca Soraci"

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  1. Artikel ; Online: Safety and efficacy of tailored antiplatelet therapy using prasugrel or ticagrelor based on clopidogrel responsiveness in endovascular treatment for intracranial aneurysms: a meta-analysis.

    Jang, Kyoung Min / Jang, Ju Sung / Choi, Hyunho / Cho, Young Dae

    Journal of neurointerventional surgery

    2023  

    Abstract: Background: Clopidogrel (CPG)-based dual antiplatelet therapy (DAPT) in combination with aspirin has been widely used before endovascular procedures for intracranial aneurysms to prevent procedural thromboembolic complication (TEC). However, the main ... ...

    Abstract Background: Clopidogrel (CPG)-based dual antiplatelet therapy (DAPT) in combination with aspirin has been widely used before endovascular procedures for intracranial aneurysms to prevent procedural thromboembolic complication (TEC). However, the main drawback of CPG is the high proportion of hyporesponders. This study sought to investigate the usefulness of tailored DAPT using novel P2Y12 inhibitors (prasugrel or ticagrelor, (PSG/TCG)) guided by a platelet reactivity test (PRT), compared with CPG-based conventional DAPT.
    Method: Data were extracted from PubMed, Embase, and Cochrane Central Register of Controlled Trials by two independent reviewers. A random effects model was used to investigate the procedural TEC and hemorrhagic complications (HEC) of the tailored DAPT and conventional therapy by risk ratios (RR) and 95% confidence intervals (95% CI). Additionally, we performed subgroup analyses to directly compare prasugrel/ticagrelor with CPG.
    Results: Six studies comprising 2557 patients were included in the analysis. Compared with conventional non-tailored therapy, PRT-guided tailored DAPT with PSG/TCG was associated with a lower risk of TEC (RR 0.40, 95% CI 0.22 to 0.74, P=0.004) without increasing HEC rates. The subgroup analysis showed that the switch to PSG/TCG in CPG hyporesponders was related to a lower incidence of TEC (RR 0.46, 95% CI 0.23 to 0.95, P=0.03) without a difference in HEC, compared with maintenance of CPG in CPG responders.
    Conclusion: Evidence from this analysis supports PRT-guided tailored DAPT (using PSG/TCG) as a better choice for preparation towards endovascular procedures to treat aneurysms. Furthermore, it suggests that PSG/TCG is not limited to the role of a substitute for CPG but may be a first-line agent for DAPT.
    Sprache Englisch
    Erscheinungsdatum 2023-08-23
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2514982-9
    ISSN 1759-8486 ; 1759-8478
    ISSN (online) 1759-8486
    ISSN 1759-8478
    DOI 10.1136/jnis-2023-020548
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Speckle noise reduction for ultrasound images by using speckle reducing anisotropic diffusion and Bayes threshold.

    Choi, Hyunho / Jeong, Jechang

    Journal of X-ray science and technology

    2019  Band 27, Heft 5, Seite(n) 885–898

    Abstract: Ultrasound imaging has been used for diagnosing lesions in the human body. In the process of acquiring ultrasound images, speckle noise may occur, affecting image quality and auto-lesion classification. Despite the efforts to resolve this, conventional ... ...

    Abstract Ultrasound imaging has been used for diagnosing lesions in the human body. In the process of acquiring ultrasound images, speckle noise may occur, affecting image quality and auto-lesion classification. Despite the efforts to resolve this, conventional algorithms exhibit poor speckle noise removal and edge preservation performance. Accordingly, in this study, a novel algorithm is proposed based on speckle reducing anisotropic diffusion (SRAD) and a Bayes threshold in the wavelet domain. In this algorithm, SRAD is employed as a preprocessing filter, and the Bayes threshold is used to remove the residual noise in the resulting image. Compared to the conventional filtering techniques, experimental results showed that the proposed algorithm exhibited superior performance in terms of peak signal-to-noise ratio (average = 28.61 dB) and structural similarity (average = 0.778).
    Mesh-Begriff(e) Algorithms ; Anisotropy ; Bayes Theorem ; Humans ; Image Enhancement/methods ; Signal-To-Noise Ratio ; Ultrasonography/methods
    Sprache Englisch
    Erscheinungsdatum 2019-06-27
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article
    ZDB-ID 2012019-9
    ISSN 1095-9114 ; 0895-3996
    ISSN (online) 1095-9114
    ISSN 0895-3996
    DOI 10.3233/XST-190515
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel: Speckle Noise Reduction Technique for SAR Images Using Statistical Characteristics of Speckle Noise and Discrete Wavelet Transform

    Choi, Hyunho / Jeong, Jechang

    Remote Sensing. 2019 May 18, v. 11, no. 10

    2019  

    Abstract: Synthetic aperture radar (SAR) images map Earth’s surface at high resolution, regardless of the weather conditions or sunshine phenomena. Therefore, SAR images have applications in various fields. Speckle noise, which has the characteristic of ... ...

    Abstract Synthetic aperture radar (SAR) images map Earth’s surface at high resolution, regardless of the weather conditions or sunshine phenomena. Therefore, SAR images have applications in various fields. Speckle noise, which has the characteristic of multiplicative noise, degrades the image quality of SAR images, which causes information loss. This study proposes a speckle noise reduction algorithm while using the speckle reducing anisotropic diffusion (SRAD) filter, discrete wavelet transform (DWT), soft threshold, improved guided filter (IGF), and guided filter (GF), with the aim of removing speckle noise. First, the SRAD filter is applied to the SAR images, and a logarithmic transform is used to convert multiplicative noise in the resulting SRAD image into additive noise. A two-level DWT is used to divide the resulting SRAD image into one low-frequency and six high-frequency sub-band images. To remove the additive noise and preserve edge information, horizontal and vertical sub-band images employ the soft threshold; the diagonal sub-band images employ the IGF; while, the low- frequency sub-band image removes additive noise using the GF. The experiments used both standard and real SAR images. The experimental results reveal that the proposed method, in comparison to state-of-the art methods, obtains excellent speckle noise removal, while preserving the edges and maintaining low computational complexity.
    Schlagwörter algorithms ; anisotropy ; remote sensing ; solar radiation ; synthetic aperture radar ; wavelet
    Sprache Englisch
    Erscheinungsverlauf 2019-0518
    Erscheinungsort Multidisciplinary Digital Publishing Institute
    Dokumenttyp Artikel
    ZDB-ID 2513863-7
    ISSN 2072-4292
    ISSN 2072-4292
    DOI 10.3390/rs11101184
    Datenquelle NAL Katalog (AGRICOLA)

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  4. Artikel ; Online: On the degrees of freedom of interference alignment for multicell MIMO interfering broadcast channels.

    Choi, Hyun-Ho

    TheScientificWorldJournal

    2014  Band 2014, Seite(n) 827357

    Abstract: The interference alignment (IA) is a promising technique to efficiently mitigate interference and to enhance capacity of a wireless network. This paper proposes an interference alignment scheme for a cellular network with L cells and K users under a ... ...

    Abstract The interference alignment (IA) is a promising technique to efficiently mitigate interference and to enhance capacity of a wireless network. This paper proposes an interference alignment scheme for a cellular network with L cells and K users under a multiple-input multiple-output (MIMO) Gaussian interfering broadcast channel (IFBC) scenario. The proposed IA scheme aligns intercell interferences (ICI) into a small dimensional subspace through a cooperative receive beamforming and cancels both the ICI and interuser interferences (IUI) simultaneously through a transmit beamforming. We characterize the feasibility condition for the proposed IA to achieve a total number of degrees of freedom (DoF) of LK in terms of the numbers of transmit antennas and receive antennas. Then we derive the maximum number of DoF achieved by the proposed IA by finding an optimal dimension of ICI alignment subspace for a given antenna configuration. The numerical results show that the proposed IA scheme has a better DoF performance than the conventional schemes.
    Mesh-Begriff(e) Algorithms ; Feasibility Studies ; Wireless Technology
    Sprache Englisch
    Erscheinungsdatum 2014-02-10
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2075968-X
    ISSN 1537-744X ; 1537-744X
    ISSN (online) 1537-744X
    ISSN 1537-744X
    DOI 10.1155/2014/827357
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel ; Online: Spatial epidemic dynamics of the COVID-19 outbreak in China.

    Kang, Dayun / Choi, Hyunho / Kim, Jong-Hun / Choi, Jungsoon

    International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases

    2020  Band 94, Seite(n) 96–102

    Abstract: Background: On 31 December 2019 an outbreak of COVID-19 in Wuhan, China, was reported. The outbreak spread rapidly to other Chinese cities and multiple countries. This study described the spatio-temporal pattern and measured the spatial association of ... ...

    Abstract Background: On 31 December 2019 an outbreak of COVID-19 in Wuhan, China, was reported. The outbreak spread rapidly to other Chinese cities and multiple countries. This study described the spatio-temporal pattern and measured the spatial association of the early stages of the COVID-19 epidemic in mainland China from 16 January-06 February 2020.
    Methods: This study explored the spatial epidemic dynamics of COVID-19 in mainland China. Moran's I spatial statistic with various definitions of neighbours was used to conduct a test to determine whether a spatial association of the COVID-19 infections existed.
    Results: The spatial spread of the COVID-19 pandemic in China was observed. The results showed that most of the models, except medical-care-based connection models, indicated a significant spatial association of COVID-19 infections from around 22 January 2020.
    Conclusions: Spatial analysis is of great help in understanding the spread of infectious diseases, and spatial association was the key to the spatial spread during the early stages of the COVID-19 pandemic in mainland China.
    Mesh-Begriff(e) Betacoronavirus ; COVID-19 ; China/epidemiology ; Cities ; Coronavirus Infections/epidemiology ; Disease Outbreaks ; Epidemics ; Humans ; Pandemics ; Pneumonia, Viral/epidemiology ; SARS-CoV-2
    Schlagwörter covid19
    Sprache Englisch
    Erscheinungsdatum 2020-04-03
    Erscheinungsland Canada
    Dokumenttyp Journal Article
    ZDB-ID 1331197-9
    ISSN 1878-3511 ; 1201-9712
    ISSN (online) 1878-3511
    ISSN 1201-9712
    DOI 10.1016/j.ijid.2020.03.076
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 4516: Hefte anzeigen Standort:
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    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
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  6. Artikel ; Online: Wettability and spontaneous penetration of a water drop into hydrophobic pores.

    Choi, Hyunho / Liang, Hong

    Journal of colloid and interface science

    2016  Band 477, Seite(n) 176–180

    Abstract: The penetration of a water drop into hydrophobic pores reflects its instability on a porous surface. To understand the mechanism of penetration and to predict the behavior of such a drop, an investigation was conducted through experimental study combined ...

    Abstract The penetration of a water drop into hydrophobic pores reflects its instability on a porous surface. To understand the mechanism of penetration and to predict the behavior of such a drop, an investigation was conducted through experimental study combined theoretical analysis. Water drops with volumes from 0.5 to 15μL were examined on Polydimethylsiloxane (PDMS) substrates containing pores of 800μm and less in diameter. Results showed a critical condition at which a drop starts to penetrate into a certain sized pore. The critical condition presents a parabolic relationship between the volume of a water drop and the size of a hydrophobic pore. This behavior was due to a net force resulting from Laplace pressure, and capillary pressure. This force was found to be affected by the porosity, wetting angle, and there after the critical condition. The finding of this research will be beneficial for future design of structured surfaces.
    Sprache Englisch
    Erscheinungsdatum 2016-09-01
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2016.05.029
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  7. Artikel: Wettability and spontaneous penetration of a water drop into hydrophobic pores

    Choi, Hyunho / Hong Liang

    Journal of colloid and interface science. 2016 Sept. 01, v. 477

    2016  

    Abstract: The penetration of a water drop into hydrophobic pores reflects its instability on a porous surface. To understand the mechanism of penetration and to predict the behavior of such a drop, an investigation was conducted through experimental study combined ...

    Abstract The penetration of a water drop into hydrophobic pores reflects its instability on a porous surface. To understand the mechanism of penetration and to predict the behavior of such a drop, an investigation was conducted through experimental study combined theoretical analysis. Water drops with volumes from 0.5 to 15μL were examined on Polydimethylsiloxane (PDMS) substrates containing pores of 800μm and less in diameter. Results showed a critical condition at which a drop starts to penetrate into a certain sized pore. The critical condition presents a parabolic relationship between the volume of a water drop and the size of a hydrophobic pore. This behavior was due to a net force resulting from Laplace pressure, and capillary pressure. This force was found to be affected by the porosity, wetting angle, and there after the critical condition. The finding of this research will be beneficial for future design of structured surfaces.
    Schlagwörter contact angle ; hydrophobicity ; polydimethylsiloxane ; porosity ; wettability
    Sprache Englisch
    Erscheinungsverlauf 2016-0901
    Umfang p. 176-180.
    Erscheinungsort Elsevier Inc.
    Dokumenttyp Artikel
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2016.05.029
    Datenquelle NAL Katalog (AGRICOLA)

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  8. Artikel: Spatial epidemic dynamics of the COVID-19 outbreak in China

    Kang, Dayun / Choi, Hyunho / Kim, Jong-Hun / Choi, Jungsoon

    Int J Infect Dis

    Abstract: BACKGROUND: On 31 December 2019 an outbreak of COVID-19 in Wuhan, China, was reported. The outbreak spread rapidly to other Chinese cities and multiple countries. This study described the spatio-temporal pattern and measured the spatial association of ... ...

    Abstract BACKGROUND: On 31 December 2019 an outbreak of COVID-19 in Wuhan, China, was reported. The outbreak spread rapidly to other Chinese cities and multiple countries. This study described the spatio-temporal pattern and measured the spatial association of the early stages of the COVID-19 epidemic in mainland China from 16 January-06 February 2020. METHODS: This study explored the spatial epidemic dynamics of COVID-19 in mainland China. Moran's I spatial statistic with various definitions of neighbours was used to conduct a test to determine whether a spatial association of the COVID-19 infections existed. RESULTS: The spatial spread of the COVID-19 pandemic in China was observed. The results showed that most of the models, except medical-care-based connection models, indicated a significant spatial association of COVID-19 infections from around 22 January 2020. CONCLUSIONS: Spatial analysis is of great help in understanding the spread of infectious diseases, and spatial association was the key to the spatial spread during the early stages of the COVID-19 pandemic in mainland China.
    Schlagwörter covid19
    Verlag WHO
    Dokumenttyp Artikel
    Anmerkung WHO #Covidence: #30963
    Datenquelle COVID19

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  9. Artikel ; Online: Spatial epidemic dynamics of the COVID-19 outbreak in China

    Kang, Dayun / Choi, Hyunho / Kim, Jong-Hun / Choi, Jungsoon

    International journal of infectious diseases, In Press

    2020  

    Abstract: BACKGROUND: On December 31, 2019, an outbreak of COVID-19 in Wuhan, China, was reported. The outbreak spread rapidly to other Chinese cities and to multiple countries. We describe the spatio-temporal pattern and measure the spatial association of the ... ...

    Abstract BACKGROUND: On December 31, 2019, an outbreak of COVID-19 in Wuhan, China, was reported. The outbreak spread rapidly to other Chinese cities and to multiple countries. We describe the spatio-temporal pattern and measure the spatial association of the early stages of the COVID-19 epidemic in mainland China from January 16 to February 6, 2020. METHODS: We explored the spatial epidemic dynamics of COVID-19 in mainland China. Moran’s I spatial statistic with various definitions of neighbors was used to conduct a test to determine whether a spatial association of the COVID-19 infections existed. RESULTS: We observed the spatial spread of the COVID-19 pandemic in China. The results showed that most of the models, except medical-care-based connection models, indicated a significant spatial association of COVID-19 infections from around January 22, 2020. CONCLUSIONS: Spatial analysis is of great help in understanding the spread of infectious diseases, and spatial association is the key to the spatial spread during the early stages of the COVID-19 pandemic in mainland China.
    Schlagwörter COVID-19 ; Spatial analysis ; China ; Spatial autocorrelation ; covid19
    Sprache Englisch
    Erscheinungsland de
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  10. Artikel ; Online: Spatial epidemic dynamics of the COVID-19 outbreak in China

    Kang, Dayun / Choi, Hyunho / Kim, Jong-Hun / Choi, Jungsoon

    International Journal of Infectious Diseases

    2020  Band 94, Seite(n) 96–102

    Schlagwörter Microbiology (medical) ; Infectious Diseases ; General Medicine ; covid19
    Sprache Englisch
    Verlag Elsevier BV
    Erscheinungsland us
    Dokumenttyp Artikel ; Online
    ZDB-ID 1331197-9
    ISSN 1878-3511 ; 1201-9712
    ISSN (online) 1878-3511
    ISSN 1201-9712
    DOI 10.1016/j.ijid.2020.03.076
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
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