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Roussel R, Andonian G, Lynn W, Sanwalka K, Robles R, Hansel C, Deng A, Lawler G, Rosenzweig JB, Ha G, Seok J, Power JG, Conde M, Wisniewski E, Doran DS, Whiteford CE. Single Shot Characterization of High Transformer Ratio Wakefields in Nonlinear Plasma Acceleration. Phys Rev Lett 2020; 124:044802. [PMID: 32058730 DOI: 10.1103/physrevlett.124.044802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 11/12/2019] [Indexed: 06/10/2023]
Abstract
Plasma wakefields can enable very high accelerating gradients for frontier high energy particle accelerators, in excess of 10 GeV/m. To overcome limits on single stage acceleration, specially shaped drive beams can be used in both linear and nonlinear plasma wakefield accelerators (PWFA), to increase the transformer ratio, implying that the drive beam deceleration is minimized relative to acceleration obtained in the wake. In this Letter, we report the results of a nonlinear PWFA, high transformer ratio experiment using high-charge, longitudinally asymmetric drive beams in a plasma cell. An emittance exchange process is used to generate variable drive current profiles, in conjunction with a long (multiple plasma wavelength) witness beam. The witness beam is energy modulated by the wakefield, yielding a response that contains detailed spectral information in a single-shot measurement. Using these methods, we generate a variety of beam profiles and characterize the wakefields, directly observing transformer ratios up to R=7.8. Furthermore, a spectrally based reconstruction technique, validated by 3D particle-in-cell simulations, is introduced to obtain the drive beam current profile from the decelerating wake data.
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Affiliation(s)
- R Roussel
- Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
| | - G Andonian
- Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
| | - W Lynn
- Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
| | - K Sanwalka
- Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
| | - R Robles
- Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
| | - C Hansel
- Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
| | - A Deng
- Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
| | - G Lawler
- Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
| | - J B Rosenzweig
- Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
| | - G Ha
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J Seok
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J G Power
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Conde
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - E Wisniewski
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - D S Doran
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C E Whiteford
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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Seok J, Lee JS, Jeong KY, Lee CM. Association between Systolic Blood Pressure after Thrombolysis and Early Neurological Improvement in Ischaemic Stroke Patients. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791702400304] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Introduction This study aimed to evaluate the relationship between systolic blood pressures (SBPs) within 12 hours after intravenous recombinant tissue plasminogen activator (rtPA) treatment and early neurological outcomes. Methods This was a retrospective observational study of acute ischaemic stroke (AIS) patients who received intravenous rtPA administration. SBPs at the time of rtPA bolus and thereafter every hour were collected. The mean, standard deviation, and coefficient of variation values of SBP during the periods of 0-2 h, 2-6 h, and 6-12 h were calculated. The primary outcome was major neurologic improvement (MNI) at 24 hours after thrombolysis. Results Serial measures of SBPs revealed different 12-hour courses between the patients with and without MNI. The difference of SBP tendency was statistically significant (p=0.013). In univariate analysis, patients with MNI showed lower levels of mean SBPs during the periods of 2-6 h and 6-12 h (p=0.030 and p=0.005, respectively), and higher frequency of very early neurologic improvement (VENI) at the end of rtPA infusion (p<0.001). In logistic regression analysis, VENI at 1 h, mean SBP value during 6-12 h, and atrial fibrillation were independently related to MNI at 24 h. Conclusions SBP level during the first 12 hours after intravenous rtPA treatment may be an important clinical factor that is associated with early neurological improvement of AIS patients.
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Affiliation(s)
- J Seok
- Kyung Hee University Medical Center, Department of Emergency Medicine, Seoul, Korea
| | - JS Lee
- Kyung Hee University Medical Center, Department of Emergency Medicine, Seoul, Korea
| | - KY Jeong
- Kyung Hee University Medical Center, Department of Emergency Medicine, Seoul, Korea
| | - CM Lee
- Kyung Hee University, Department of Medicine, Graduate School, Seoul, Korea
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Hong JY, Seok J, Kim JM, Jang YJ, Kim BJ. Successful treatment of trichoepithelioma with a novel insulated, monopolar, radiofrequency microneedle device. Clin Exp Dermatol 2017; 43:108-109. [DOI: 10.1111/ced.13218] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2016] [Indexed: 11/29/2022]
Affiliation(s)
- J. Y. Hong
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul South Korea
| | - J. Seok
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul South Korea
| | - J. M. Kim
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul South Korea
| | - Y. J. Jang
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul South Korea
| | - B. J. Kim
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul South Korea
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Lee JS, Kim JM, Seok J, Kim BJ. Correlation between socio-economic status and atopic dermatitis in Korean adults: the Korea national health and nutrition examination survey (2007-2014). J Eur Acad Dermatol Venereol 2017; 31:1509-1515. [PMID: 28516452 DOI: 10.1111/jdv.14343] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Accepted: 04/19/2017] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Atopic dermatitis (AD) is one of the most common allergic diseases. Its prevalence has been increasing in recent decades. Socio-economic status is well-known risk factor of allergic diseases. OBJECTIVE This study was performed to investigate the relationship between socio-economic status and AD in Korean adults. METHODS Data were acquired from 47 351 men and women, ≥19 years of age who participated in the Korea National Health and Nutrition Examination Surveys (KNHANES) conducted from 2007 to 2014. The presence of AD was based on self-reported physician diagnosis of AD in the Health Interview Surveys. RESULTS The prevalence of AD was 3.1%, which decreased with increasing age. In univariate analysis, adults with AD were prone to be female, younger, never-married, well educated, lower household members, and urban dwelling (all P < 0.01). Monthly family income and smoking status were not associated with the presence of AD. The prevalence of hypertension, diabetes mellitus and asthma was higher in AD subjects (all P < 0.01), while obesity was not associated with adult AD. After adjusting for confounders, logistic regression analysis showed female sex (adjusted odds ratio [aOR]: 1.483, 95% CI: 1.268-1.734), age (P < 0.01), marital status (Single: aOR: 1.307, 95% CI: 1.012-1.690; Never-married: aOR: 1.938, 95% CI: 1.513-2.482), urban residence (aOR: 1.281, 95% CI: 1.045-1.569) and asthma (aOR: 1.788, 95% CI: 1.416-2.258) were associated with higher prevalence of AD (all P < 0.01). CONCLUSION Female sex, age, marital status, urban residence, and the presence of asthma are important risk factors of the prevalence of AD in Korean adults.
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Affiliation(s)
- J S Lee
- Department of Pediatrics, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea
| | - J M Kim
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea
| | - J Seok
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea
| | - B J Kim
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea
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Choi S, Seok J, Kwon H, Kwon T, Kim B. Hyaluronic acid injection via a pneumatic microjet device to improve forehead wrinkles. J Eur Acad Dermatol Venereol 2016; 31:e164-e166. [DOI: 10.1111/jdv.13900] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- S.Y. Choi
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
- Department of Dermatology; Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
| | - J. Seok
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - H.J. Kwon
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - T.R. Kwon
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - B.J. Kim
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
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Affiliation(s)
- S.Y. Jeong
- Departments of Dermatology; Chung-Ang University College of Medicine; Seoul South Korea
- GoodDay Skin & Laser Clinic; Seoul South Korea
| | - K.Y. Park
- Departments of Dermatology; Chung-Ang University College of Medicine; Seoul South Korea
| | - J. Seok
- Departments of Dermatology; Chung-Ang University College of Medicine; Seoul South Korea
| | - E.J. Ko
- Departments of Dermatology; Chung-Ang University College of Medicine; Seoul South Korea
| | - T.Y. Kim
- Clinical Research Team; Daewoong Pharmaceutical; Seoul South Korea
| | - B.J. Kim
- Departments of Dermatology; Chung-Ang University College of Medicine; Seoul South Korea
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Jeong SY, Kwon TR, Seok J, Park KY, Kim BJ. Non-invasive tumescent cryolipolysis using a new 4D handpiece: a comparative study with a porcine model. Skin Res Technol 2016; 23:79-87. [DOI: 10.1111/srt.12305] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/21/2016] [Indexed: 01/09/2023]
Affiliation(s)
- S. Y. Jeong
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
- GoodDay Skin & Laser Clinic; Seoul South Korea
| | - T. R. Kwon
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - J. Seok
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - K. Y. Park
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - B. J. Kim
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
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Park KY, Park MK, Seok J, Li K, Seo SJ. Clinical characteristics of Korean patients with filaggrin-related atopic dermatitis. Clin Exp Dermatol 2016; 41:595-600. [DOI: 10.1111/ced.12854] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/14/2015] [Indexed: 02/03/2023]
Affiliation(s)
- K. Y. Park
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - M. K. Park
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - J. Seok
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - K. Li
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - S. J. Seo
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
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Seok J, Yeo IK, Park KY, Kim BJ, Seo SJ, Hong CK. Permanent leucoderma after hair transplantation surgery. Clin Exp Dermatol 2016; 41:440-2. [PMID: 26805507 DOI: 10.1111/ced.12799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/24/2015] [Indexed: 12/01/2022]
Affiliation(s)
- J Seok
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea
| | - I K Yeo
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea
| | - K Y Park
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea
| | - B J Kim
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea
| | - S J Seo
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea
| | - C K Hong
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea.
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Li K, Seok J, Park K, Yoon Y, Kim K, Seo S. Copy-number variation of the filaggrin gene in Korean patients with atopic dermatitis: what really matters, ‘number’ or ‘variation’? Br J Dermatol 2016; 174:1098-100. [DOI: 10.1111/bjd.14287] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- K. Li
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - J. Seok
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - K.Y. Park
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - Y. Yoon
- Department of Microbiology; Chung-Ang University College of Medicine; Seoul Korea
| | - K.H. Kim
- Department of Dermatology; Seoul National University College of Medicine; Seoul Korea
| | - S.J. Seo
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
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Seok J, Hong J, Jang J, Bae J, Choi S, Yoo K, Kim B. The NEEDLELESS MICROJET: a novel device for hypertrophic scar remodelling on the forehead. J Eur Acad Dermatol Venereol 2015; 30:e145-e146. [DOI: 10.1111/jdv.13458] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Seok
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - J.Y. Hong
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - J.H. Jang
- Applicator Research Team; Amore Pacific Corporation Research and Development Center; Yongin Korea
| | - J.H. Bae
- Applicator Research Team; Amore Pacific Corporation Research and Development Center; Yongin Korea
| | - S.Y. Choi
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
| | - K.H. Yoo
- Department of Dermatology; Catholic Kwandong University International St. Mary's Hospital; Incheon Korea
| | - B.J. Kim
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
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Cho S, Kim S, Kim JH, Zhao J, Seok J, Keum DH, Baik J, Choe DH, Chang KJ, Suenaga K, Kim SW, Lee YH, Yang H. Phase patterning for ohmic homojunction contact in MoTe2. Science 2015; 349:625-8. [DOI: 10.1126/science.aab3175] [Citation(s) in RCA: 729] [Impact Index Per Article: 81.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Choi SY, Yoo KH, Oh CT, Kwon TR, Choi EJ, Seok J, Kim BJ. High intensity focused ultrasound as a potential new modality for the treatment of pigmentary skin disorder. Skin Res Technol 2015; 22:131-6. [PMID: 26094501 DOI: 10.1111/srt.12239] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/17/2015] [Indexed: 11/27/2022]
Abstract
BACKGROUND/PURPOSE The clinical skin tightening benefits of high intensity focused ultrasound (HIFU) have been established, but its mechanism of action in pigmented skin disorders remains unknown. We macroscopically and histopathologically investigated dermatological changes after HIFU at different exposure doses in a UVB-induced guinea pig model of hyperpigmentation. METHODS We applied HIFU irradiation at 0.1 and 0.2 J/cm(2) to UVB-induced spotty hyperpigmentation in guinea pig skin. The therapeutic effects of HIFU were judged based on gross appearance using photography, dermoscopy, and chromametry during a period of 3 weeks after HIFU irradiation. Histological assessments were performed using Fontana-Masson staining 1 day before and 3 weeks after HIFU irradiation. RESULTS Macroscopically, UVB-induced hyperpigmentation was significantly reduced 2 weeks after HIFU with 0.2 J/cm(2) , and 3 weeks after HIFU with 0.1 J/cm(2) . Histopathologically, the heavy deposition of melanin in the epidermis induced by UVB exposure was reduced 3 weeks after HIFU irradiation. CONCLUSION We confirmed that HIFU has a positive effect on UVB-induced hyperpigmentation as well as mechanical destructive activity. We suggest that HIFU may be useful as an alternative modality for human patients suffering from skin pigmentary conditions.
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Affiliation(s)
- S Y Choi
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, South Korea
| | - K H Yoo
- Department of Dermatology, Catholic Kwandong University International ST.Mary's Hospital, Incheon, South Korea
| | - C T Oh
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, South Korea.,Department of Medicine, Graduate school, Chung-Ang University, Seoul, South Korea
| | - T R Kwon
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, South Korea.,Department of Medicine, Graduate school, Chung-Ang University, Seoul, South Korea
| | - E J Choi
- Department of Medicine, Graduate school, Chung-Ang University, Seoul, South Korea
| | - J Seok
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, South Korea
| | - B J Kim
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, South Korea
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Seok J, Lee D, Kim K. 23. Correlation of clinical and MRI findings in localizing lesions in Bell’s palsy. Clin Neurophysiol 2008. [DOI: 10.1016/j.clinph.2007.11.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Chung J, Ye S, Kim J, Kim I, Seok J, Lee J, Suh T. SU-FF-T-368: Radioprotective Effect of the Bolus On Testicular Dose Following Radiation Therapy. Med Phys 2007. [DOI: 10.1118/1.2761093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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