In Soo Kim

Yonsei University Hospital, Sŏul, Seoul, South Korea

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Publications (52)57.64 Total impact

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    ABSTRACT: The identification of sick sinus syndrome (SSS) in patients with atrial flutter (AFL) is difficult before the termination of AFL. This study investigated the patient characteristics used in predicting a high risk of SSS after AFL ablation. Out of 339 consecutive patients who had undergone radiofrequency ablation for AFL from 1991 to 2012, 27 (8%) had SSS (SSS group). We compared the clinical characteristics of patients with and without SSS (n=312, no-SSS group). The SSS group was more likely to have a lower body mass index (SSS: 22.5±3.2; no-SSS: 24.0±3.0 kg/m²; p=0.02), a history of atrial septal defects (ASD; SSS: 19%; no-SSS: 6%; p=0.01), a history of coronary artery bypass graft surgery (CABG; SSS: 11%; no-SSS: 2%; p=0.002), and a longer flutter cycle length (CL; SSS: 262.3±39.2; no-SSS: 243.0±40; p=0.02) than the no-SSS group. In multivariate analysis, a history of ASD [odds ratio (OR) 3.7, 95% confidence interval (CI) 1.2-11.4, p=0.02] and CABG (7.1, 95% CI 1.5-32.8, p=0.01) as well as longer flutter CL (1.1, 95% CI 1.0-1.2, p=0.04) were independent risk factors for SSS. A history of ASD and CABG as well as longer flutter CL increased the risk of SSS after AFL ablation. While half of the patients with SSS after AFL ablation experienced transient SSS, heart failure was associated with irreversible SSS.
    Yonsei Medical Journal 01/2015; 56(1):31-7. DOI:10.3349/ymj.2015.56.1.31 · 1.26 Impact Factor
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    Taehan-Kŭmsok-Hakhoe-chi = Journal of the Korean Institute of Metals and Materials 06/2014; 52(6):397-406. DOI:10.3365/KJMM.2014.52.6.397 · 1.02 Impact Factor
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    ABSTRACT: The aim of this study was to evaluate whether the clinical outcomes were associated with socioeconomic status (SES) in patients with acute myocardial infarction (AMI) who underwent percutaneous coronary intervention (PCI). The author analyzed 2,358 patients (64.9 ± 12.3 yr old, 71.5% male) hospitalized with AMI between November 2005 and June 2010. SES was measured by the self-reported education (years of schooling), the residential address (social deprivation index), and the national health insurance status (medical aid beneficiaries). Sequential multivariable modeling assessed the relationship of SES factors with 3-yr major adverse cardiovascular events (MACEs) and mortality after the adjustment for demographic and clinical factors. During the 3-yr follow-up, 630 (26.7%) MACEs and 322 (13.7%) all-cause deaths occurred in 2,358 patients. In multivariate Cox proportional hazards regression modeling, the only lower education of SES variables was associated with MACEs (hazard ratio [HR], 1.41; 95% confidence interval [CI], 1.04-1.91) and mortality (HR, 1.93; 95% CI, 1.16-3.20) in the patients with AMI who underwent PCI. The study results indicate that the lower education is a significant associated factor to increased poor clinical outcomes in patients with AMI who underwent PCI.
    Journal of Korean medical science 04/2014; 29(4):536-43. DOI:10.3346/jkms.2014.29.4.536 · 1.25 Impact Factor
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    ABSTRACT: Morningness-Eveningness (ME) can be defined by the difference in individual diurnal preference observed from general behavioral patterns including sleep habits. The Horne & Östberg Morningness-Eveningness Questionnaire (MEQ) has been used for classifying ME types. We examined the reliability of a Korean version of the MEQ (Korean MEQ) and verified its validity by comparing responses on the Korean MEQ to objectively-recorded sleep-wake rhythms. After translating and back translating the MEQ from English into Korean, we examined the internal consistency of 19 items of the Korean MEQ in 91 subjects, and the test-retest reliability in 21 subjects who took the Korean MEQ twice, 4 weeks apart. The Korean MEQ was then administered to 1022 young adult subjects. A subset of 46 morning, neither, and evening type subjects took part in a validation study in which their rest-activity timing was collected by actigraphy for 7 days. Cosinor analyses on these data were done to obtain the acrophase and amplitude of the sleep-wake rhythm. Cronbach's alpha of the total scores from the Korean MEQ was 0.77, and the test-retest reliability intra-class correlation coefficient was 0.90 (p < 0.0001). There was a significant negative correlation between Korean MEQ score and reported sleep-wake timing among the entire cohort (p < 0.0001). There was a significant difference in bedtime and wake time (on both work and free days), and in the mean sleep-wake rhythm acrophase, between ME types (p < 0.01). In this study, the validity of the Korean MEQ was verified by illustrating the difference in acrophases of the sleep-wake rhythm between the ME types in young adults.
    Chronobiology International 01/2014; DOI:10.3109/07420528.2013.867864 · 2.88 Impact Factor
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    ABSTRACT: The objective of this study is to improve water quality resulting from rainwater purification treatment and to utilize reclaimed water purification system and high-class treatment purification system. This can be done by developing a purification treatment technique through resolution of discharged ozone problems by circulation-type of ozone treatment method with the use of a high-efficiency air-cooled cylindrical ozone generator. While the final removal rate of BOD showed the highest rate of 96% for 12g without showing a great difference for the ozone injection amount of 9g and 12g, the final removal rate of COD upon treating for 12 minutes showed 73%, 66%, 93% and 96% for 3g, 6g, 9g and 12g, respectively, exhibiting similar treatment results to that of BOD. The removal of TSS and VSS due to ozone treatment was indicated not to have occurred. Also, upon passage of the magnetized water device, the removal rate of colon bacterium and general bacteria was shown to be about 35%, while a high removal rate exceeding 70% was indicated during the initial 3 minutes. Upon final treatment for 12 minutes, sterilization power above 99% was exhibited. Upon treatment using the magnetized water device and the OH- radical generator, not only dissolved suspended materials but also excellent sterilization power appeared to be identifiable.
    09/2013; 423-426:1383-1387. DOI:10.4028/www.scientific.net/AMM.423-426.1383
  • Kwang Taek Kim, In Soo Kim
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    ABSTRACT: This study proposed and demonstrated a fiber Bragg grating sensor for simultaneous detection of the temperature and refractive index of a liquid. The fiber Bragg grating is composed of three index layers: an inner core, an outer core, and a cladding. The cladding was etched for evanescent wave coupling between the outer core mode and an external liquid. The Bragg wavelength of the inner core mode is used for obtaining temperature data, while the refractive index for the liquid was determined by using the difference between the Bragg wavelength of the inner core mode and that of outer core mode.
    Fiber and Integrated Optics 05/2013; 32(3). DOI:10.1080/01468030.2013.765931 · 0.40 Impact Factor
  • The American Journal of Cardiology 04/2013; 111(7):18B. DOI:10.1016/j.amjcard.2013.01.046 · 3.43 Impact Factor
  • The American Journal of Cardiology 04/2013; 111(7):70B. DOI:10.1016/j.amjcard.2013.01.175 · 3.43 Impact Factor
  • Kwang Taek Kim, In Soo Kim
    03/2013; 22(2):95-99. DOI:10.5369/JSST.2013.22.2.95
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    ABSTRACT: To compensate for the temperature dependency of a standard FBG, a cladding-etched FBG immersed with a liquid mixture having a negative thermo-optic coefficient is presented, and its characteristics are investigated. The Bragg wavelength of the cladding-etched FBG is shifted counter to the direction of the Bragg wavelength shift of a conventional FBG according to the mixing ratio of glycerin to water; thus, the temperature-dependent Bragg wavelength shift was almost compensated by using a liquid mixture of water (50%) and glycerin (50%) having the negative thermo-optic coefficient of -5 × 10(-4) °C(-1).
    Sensors 12/2012; 12(6):7886-92. DOI:10.3390/s120607886 · 2.05 Impact Factor
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    ABSTRACT: The precipitation behaviors of the topologically close-packed (TCP) phase in the Ru-free and Ru-containing single-crystal Ni-based superalloys have been investigated. All the TCP phases have been identified as the μ phase with large numbers of planar defects by using a scanning transmission electron microscope (STEM). The addition of 3 wt pct Ru effectively suppresses the nucleation of the μ phase because the addition of 3 wt pct Ru not only decreases the supersaturation of γ phase but also increases the elastic strain energy for the nucleation of the μ phase. Additionally, the addition of 3 wt pct Ru makes more Re enter the μ phase during its growth and the critical nucleus radius of the μ phase becomes larger. Therefore, it is found that the addition of 3 wt pct Ru decreases the growth rate of the μ phase.
    Metallurgical and Materials Transactions A 10/2012; 43(10). DOI:10.1007/s11661-012-1163-z · 1.73 Impact Factor
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    ABSTRACT: This study investigated changes in phase fraction caused by the addition of Mo, as well as the subsequent behaviour of N and its effect on the mechanical properties of welded 24Cr-N duplex stainless steel weld metals. Filler metal was produced by fixing the contents of Cr, Ni, N, and Mn while adjusting the Mo content to 1.4, 2.5, 3.5 wt%. The delta ferrite fraction increased as the Mo content increased. In contrast, the (sic) fraction decreased and changed from a round to an acicular shape. Secondary austenite (gamma') was observed in all specimens in a refined form, but it decreased as the Mo content increased to the extent that it was nearly impossible to find any secondary austenite at 3.5 wt% Mo. Both tensile and yield strengths increased with the addition of Mo. In contrast, the highest value of ductility was observed at 1.41 wt% Mo. At all temperatures, impact energy absorption showed the lowest value at 3.5 wt% Mo, at which the amount of delta-ferrite was greatest. There was no significant temperature dependence of the impact energy absorption values for any of the specimens. As the fraction of gamma phase decreased, the amount of N stacked in the gamma phase increased. Consequently, the stacking fault energy decreased, while the hardness of gamma increased.
    Taehan-Kŭmsok-Hakhoe-chi = Journal of the Korean Institute of Metals and Materials 09/2012; 50(9):645-651. DOI:10.3365/KJMM.2012.50.9.645 · 1.02 Impact Factor
  • Philosophical Magazine A 08/2012; 92(22):2809-2825. DOI:10.1080/14786435.2012.676212
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    ABSTRACT: Solid organ transplant recipients frequently report gastrointestinal symptoms, especially heartburn or dyspepsia. However, the prevalence of endoscopic erosive esophagitis (EE) and associated risk factors after transplantation are unknown. The aim of this study was to determine whether there was a high incidence of endoscopic findings of EE in solid organ transplant recipients. This retrospective case-control study included 256 of 3,152 solid organ transplant recipients who underwent sequential screening upper endoscopic examinations and an equal number of controls. Forty-four (17.2%) and 16 (6.2%) cases of EE were detected in the solid organ transplant and control groups, respectively (p<0.001). In the multivariate analysis, transplantation was significantly associated with EE (odds ratio [OR], 6.48; 95% confidence interval, 2.74 to 15.35). Factors such as old age (OR, 1.17), the presence of a hiatal hernia (OR, 5.84), an increased duration of immunosuppression (OR, 1.07), and the maintenance administration of mycophenolate mofetil (OR, 4.13) were independently associated with the occurrence of EE in the solid organ transplant recipients. A significant increase in the incidence of endoscopically detected EE was observed in solid organ transplant recipients. This increased incidence was associated with the type and duration of the immunosuppressive therapy.
    Gut and liver 07/2012; 6(3):349-54. DOI:10.5009/gnl.2012.6.3.349 · 1.49 Impact Factor
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    ABSTRACT: The relationship between lipid profile and coronary plaque tissue characteristics in patients with stable angina pectoris (SAP) is unclear. The aim of this study was to evaluate the relationship between tissue characteristics and lipid profile and predictors of unstable plaques (UPs) in patients with SAP by virtual histology intravascular ultrasonography (VH-IVUS). VH-IVUS was performed for target lesions in patients with SAP (61.7±9.2 years, 174 males, n=266) at the time of coronary angiography. UPs are characterized by thin-cap fibroatheroma, ruptured plaque, or remaining thrombus with VH-IVUS. The present study showed that 34 SAP patients had UPs (61.6±9.2 years, 24 males, 12.8%). The percentage of plaque area in the minimum luminal area in high low density lipoprotein-cholesterol (LDL-C)/high density lipoprotein-cholesterol (HDL-C) ratio patients was significantly higher than in low LDL-C/HDL-C ratio patients (72.7±9.5% vs. 69.9±9.3%, p=0.035). An LDL-C/HDL-C ratio >2.0 was an independent predictor for UPs in SAP patients (odds ratio 5.252, 95% confidence interval 1.132-24.372, p=0.034). An elevated LDL-C/HDL-C ratio is a positive predictor for coronary plaque vulnerability in patients with SAP.
    Korean Circulation Journal 04/2012; 42(4):246-51. DOI:10.4070/kcj.2012.42.4.246
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    ABSTRACT: We evaluated the usefulness of intracranial stent implantation for treating patients with atherosclerotic stenosis and with recurrent, ischemic, neurological symptoms despite having undergone medical therapy. Between March 2004 and April 2010, we attempted intracranial, stent-assisted angioplasty in 77 patients with 85 lesions (anterior circulation 73 cases, posterior circulation 12 cases) and who had ischemic neurological symptoms with more than 50% major cerebral artery stenosis. We analyzed the results regarding the technical success rate, complication rate, and restenosis rate during the mean 29.4 month follow-up period. Intracranial stent implantation was successfully performed in 74 cases (87.1%). In nine cases among the 11, failed cases, stent implantation failure was due to the tortuosity of the target vessel. One patient experienced middle cerebral artery rupture during the procedure, and we embolized the vessel using a microcoil. Five patients developed cerebral infarction in three weeks after the procedure, three of whom improved using conservative management, although the other, two patients expired. The mean number of residual stenoses decreased from 72.3% to 14.7%. Three patients demonstrated significant in-stent restenosis, i.e. more than 50%, during the follow-up period. As stent-assisted angioplasty in intracranial, atherosclerotic stenosis is effective and relatively safe, it can be considered as an alternative treatment for patients with recurrent, ischemic, neurologic symptoms despite having undergone medical therapy.
    02/2012; 7(1):27-33. DOI:10.5469/neuroint.2012.7.1.27
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    ABSTRACT: We present a case of successful retrieval of an intracranial stent using a snare wire. A 52-year-old woman presented with left border zone infarction. On cerebral angiography, the C6 segment of the left internal carotid artery (ICA) showed significant stenosis. We attempted stenting of the lesion, although stent dislodgement occurred in the ICA C4 segment. We successfully removed it using a snare loop, and there were no complications during the procedure.
    02/2012; 7(1):50-3. DOI:10.5469/neuroint.2012.7.1.50
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    ABSTRACT: The effects of grain boundary serration on boron segregation and liquation cracking behavior in a simulated weld heat-affected zone (HAZ) of a wrought nickel-based superalloy 263 have been investigated. The serrated grain boundaries formed by the developed heat treatment were highly resistant to boron segregation; the serrated sample contained 41.6pct grain boundaries resistant to boron enrichment as compared with 14.6pct in the unserrated sample. During weld thermal cycle simulation, liquated grain boundaries enriched with boron were observed at the peak temperature higher than 1333K (1060°C) in both unserrated and serrated samples; however, serrated grain boundaries exhibited a higher resistance to liquation. The primary cause of liquation in this alloy was associated with the segregation of the melting point depressing element boron at grain boundaries. The hot ductility testing result indicated that the serrated grain boundaries showed a lower susceptibility to liquation cracking; the grain boundary serration led to an approximate 15K decrease in the brittle temperature range. These results reflect closely a significant decrease in interfacial energy as well as a grain boundary configuration change by the serration.
    Metallurgical and Materials Transactions A 01/2012; 43(1):173-181. DOI:10.1007/s11661-011-0837-2 · 1.73 Impact Factor
  • Taehan-Kŭmsok-Hakhoe-chi = Journal of the Korean Institute of Metals and Materials 07/2011; 49(7):535-540. DOI:10.3365/KJMM.2011.49.7.535 · 1.02 Impact Factor
  • Am Jang, In Soo Kim
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    ABSTRACT: The ability to detect and enumerate the specific bacteria is essential for determining their fate in various biological processes. Although fluorescent in situ hybridization (FISH) technique using rRNA-targeted oligonucleotide probes may be considered as the most rapid method for identification of a single bacterial cell, it could not efficiently count cells due to the limitations of light microscopy. In this study, to make accurate estimates of the active nitrifying bacterial populations from activated sludge samples, applied FISH method using Luminescence Spectrometer LS50B was used. Enumeration of nitrifying bacteria by FISH using Luminescence Spectrometer can help in the optimization of the performance of biological nitrogen removal processes.
    Journal of the Korean Society for Applied Biological Chemistry 06/2011; 54(3). DOI:10.3839/jksabc.2011.064 · 0.54 Impact Factor

Publication Stats

120 Citations
57.64 Total Impact Points

Institutions

  • 2012–2015
    • Yonsei University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
    • Korea Institute of Materials Science
      • Division of Advanced Metallic Materials
      Sŏngnam, Gyeonggi Province, South Korea
  • 2010–2014
    • Chonnam National University Hospital
      Sŏul, Seoul, South Korea
    • Keimyung University
      • Dongsan Medical Center
      Sŏul, Seoul, South Korea
  • 2012–2013
    • Honam University
      Gwangju, Gwangju, South Korea
  • 2009–2012
    • Chonnam National University
      • Department of Cardiology
      Gwangju, Gwangju, South Korea
  • 2011
    • Gwangju Institute of Science and Technology
      • School of Environmental Science and Engineering
      Gwangju, Gwangju, South Korea
  • 2006–2010
    • Kumoh National Institute of Technology
      Sŏul, Seoul, South Korea
  • 2005–2010
    • Dong-A University
      • Department of Materials Science and Engineering
      Tsau-liang-hai, Busan, South Korea
  • 2008–2009
    • Yonsei University
      • Department of Materials Science and Engineering
      Sŏul, Seoul, South Korea
  • 2006–2008
    • Korea Institute of Machinery and Materials
      Sŏul, Seoul, South Korea