Y S Kim

Kyungpook National University, Daikyū, Daegu, South Korea

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Publications (516)1941.88 Total impact

  • J.Y. Park · G.Y. Gwak · J M Kim · H J Oh · N J Yi · K S Suh · D K Kim · C S Lim · Y.S. Kim · J P Lee
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    ABSTRACT: Liver transplantation (LT) is the treatment of choice for hepatorenal syndrome (HRS). Recently, acute kidney injury (AKI) due to acute hepatitis A (HA) is increasing, but the outcome of LT is not well established. We investigated the outcomes of LT in patients with AKI due to acute HA compared with those of patients with HRS due to other causes. We investigated the outcomes of LT in 20 patients with AKI associated with acute HA (HAV group) compared with 76 patients with hepatorenal syndrome (HRS) due to other causes (HRS group) at 3 Korea centers. Preoperative mean prothrombin time and serum creatinine level were higher in the HAV group than in the HRS group. But mean total bilirubin level was lower in the HAV group. There was no difference in Model for End-Stage Liver Disease scores. Post-transplantation patient and graft survival rates were similar between the 2 groups. More patients in the HAV group needed post-transplantation hemodialysis than in the HRS group (65.0% vs 38.2%; P = .043). However, post-transplantation estimated glomerular filtration rate was significantly higher in the HAV group after post-transplantation month 2 (P < .05). Peri-transplantation kidney function of the HAV group was poorer than that of HRS group. However, post-transplantation long-term renal outcome could be better in the HAV group. Copyright © 2015 Elsevier Inc. All rights reserved.
    Transplantation Proceedings 04/2015; 47(3):709-17. DOI:10.1016/j.transproceed.2014.10.057 · 0.95 Impact Factor
  • K D Yoo · J N An · C T Kim · J H Cho · C D Kim · S K Park · D W Chae · Y.K. Oh · C S Lim · Y S Kim · Y H Kim · J P Lee
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    ABSTRACT: The kidney transplantation rate in elderly patients is increasing rapidly. However, the clinical outcomes of kidney transplantation in elderly patients have not yet been thoroughly evaluated. This multicenter cohort study included adult kidney transplant recipients (KTRs) admitted to five major tertiary hospitals in Korea between 1997 and 2012. A total of 3,565 adult participants were enrolled. Patient survival, allograft survival, and biopsy-proven acute rejection (BPAR) of 242 elderly recipients (≥60 years) were assessed and compared with those of a younger population. Patients were divided into five groups according to age at time of transplantation. The proportion of elderly patients was 6.7 % (mean age, 63.1 ± 2.7 years; n = 242). The numbers of male patients (69.4%), those with diabetes mellitus history (36.3%), and those with pretransplantation ischemic heart disease history (17.7%) were significantly higher in the elderly group than in the younger age groups. Elderly patients were more likely to receive a cadaveric kidney, and overall mortality rates were significantly higher in the elderly patients (1-year survival 93.3%, 5-year survival 91.3%). However, death-censored allograft survival rate and BPAR were not affected by patient age (P = .104 and .501, respectively). Among the elderly, BPAR and female donors were independent risk factors for allograft loss. The overall survival rate of the elderly KTRs was significantly lower than that of younger KTRs. However, the death-censored allograft survival rate did not differ between groups. Kidney transplantation should not be stagnated especially in elderly patients with end-stage renal disease. Copyright © 2015 Elsevier Inc. All rights reserved.
    Transplantation Proceedings 04/2015; 47(3):600-7. DOI:10.1016/j.transproceed.2015.01.021 · 0.95 Impact Factor
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    ABSTRACT: In chloroplasts and mitochondria, antioxidant mechanisms include the ascorbate-glutathione cycle, and monodehydroascorbate reductase (MDHAR) is important for regeneration of ascorbate (AsA) from monodehydroascorbate (MDHA). To improve detoxification of reactive oxygen species (ROS), we established a construct of the MDHAR gene from Brassica rapa fused to the targeting signal peptides of Pisum sativum glutathione reductase (GR), which was controlled by a stress-inducible SWPA2 promoter, and introduced this expression system into Arabidopsis thaliana. Transgenic (TG) plants overexpressing BrMDHAR targeted to chloroplasts and mitochondria through signal peptides showed an elevated MDHAR activity and an increased ratio of AsA to dehydroascorbate (DHA) when compared to wild-type (WT) plants under a freezing stress. These led to increased photosynthetic parameters, redox homeostasis, and biomass in TG plants when compared to the WT plants. Our results suggest that the overexpression of the BrMDHAR gene targeted to chloroplasts and mitochondria conferred an enhanced tolerance against the freezing stress, and a stress adaptation of dual-targeted BrMDHAR was better than that of single BrMDHAR.
    Biologia Plantarum 09/2014; 58(3):456-468. DOI:10.1007/s10535-014-0416-7 · 1.74 Impact Factor
  • Y S Kim · E Sohn · D H Jung · Y M Lee · C S Kim · J Kim · J S Kim
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    ABSTRACT: To identify novel genes regulated in diabetic nephropathy.
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    ABSTRACT: BACKGROUND The prevalence and economic burden of chronic obstructive pulmonary disease (COPD) are increasing worldwide. However, little information is available concerning COPD-associated health care use and costs in Korea. OBJECTIVE To analyse 1) health care use, medical costs and medication use in 2009, and 2) changes in costs and medication use over 5 years (2006–2010). DESIGNUsing the database of the Korean Health Insurance Review and Assessment Service, COPD patients were identified by searching on both ICD-10 codes and COPD medication. RESULTSA total of 192 496 COPD patients were identified in 2009. Total medical costs per person were US$2803 ± 3865; the average annual number of days of out-patient care and days of hospitalisation were respectively 40 ± 36 and 11 ± 33. Methylxanthine and systemic beta-agonists were the most frequently used drugs. However, the number of prescriptions for long-acting muscarinic antagonist increased rapidly. The total cost of COPD-related medications increased by 33.1% over 5 years. CONCLUSION The present study provides new insight into health care use and the economic burden of COPD in Korea. Changing patterns of COPD-related medication use could help inform COPD management policies.
    The International Journal of Tuberculosis and Lung Disease 06/2014; 18(6). DOI:10.5588/ijtld.13.0634 · 2.76 Impact Factor
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    ABSTRACT: Dehydroascorbate reductase (DHAR, EC helps to maintain redox pools of ascorbate (AsA) by recycling dehydroascorbate (DHA) to AsA. To investigate whether DHAR influences the acquired tolerance of rice plants to abiotic stresses, cDNA encoding DHAR (OsDHAR1) was isolated from rice and used to develop OsDHAR1-overexpressing transgenic rice plants regulated by a maize ubiquitin promoter. The incorporation and expression of the transgene was confirmed by polymerase chain reaction (PCR) and semi-quantitative reverse transcription PCR, real-time PCR, Western blot and enzyme activity. The overexpression of OsDHAR1 greatly increased the DHAR activity and the AsA/DHA ratio, following increase in AsA content and decrease in DHA content. In addition, the enzyme activity of monodehydroascorbate reductase, glutathione reductase and ascorbate peroxidase, which are related to the ascorbate–glutathione systems, was enhanced in the presence and the absence of salt stress in homozygous transgenic rice plants (OsDHAR1-OX1, -OX2) harbouring Ubi::OsDHAR1. In addition, OsDHAR1-expressing transgenic rice plants enhanced the redox state by reducing both hydroperoxide and malondialdehyde levels under salt and methyl viologen (MV) stress conditions, which led to better plant growth, ion leakage and quantum yield (Fv/Fm). Therefore, our results show that the overexpression of OsDHAR1 increases the adaptation of rice plants to salt stress, by maintaining the AsA pool, ion homoeostasis and redox homoeostasis. Finally, the findings of this study indicate that OsDHAR1 plays an important role in attenuating the deleterious effects of various abiotic stresses.
    Journal of Agronomy and Crop Science 05/2014; 200(6). DOI:10.1111/jac.12078 · 2.62 Impact Factor
  • E M Choi · K S Suh · S Y Rhee · Y S Kim
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    ABSTRACT: Abstract Methylglyoxal (MG) is a precursor of advanced glycation end products, which contribute to diabetic complications, including bone defects. In the present study, the effect of sciadopitysin on MG-induced cytotoxicity was investigated using osteoblastic MC3T3-E1 cells. Pretreatment of MC3T3-E1 cells with sicadopitysin prevented the MG-induced cell death and protein adducts formation. Sciadopitysin restored the MG-induced change of glyoxalase activity to almost the control level and increased glutathione levels. In addition, sicadopitysin decreased MG-induced formation of intracellular reactive oxygen species (ROS), mitochondrial superoxide, and cardiolipin peroxidation. These findings suggest that sciadopitysin provide a protective action against MG-induced glycation by increasing MG detoxification system and by reducing oxidative stress. Pretreatment with siadopitysin prior to MG exposure reduced MG-induced mitochondrial dysfunction by preventing mitochondrial membrane potential (MMP) dissipation and adenosine triphosphate (ATP) loss. The nitric oxide (NO) level was decreased by MG treatment, but it was significantly increased by sciadopitysin, suggesting that sciadopitysin may induce NO-dependent mitochondrial biogenesis. Furthermore, sciadopitysin treatment increased the levels of sirtuin 1 (SIRT1), peroxisome proliferator-activated receptor gamma coactivator 1 alpha (PGC-1α), nuclear respiratory factor 1 (NRF-1), and mitochondrial transcription factor A (TFAM). These findings indicate that sciadopitysin might exert its therapeutic effects via upregulation of mitochondrial biogenesis. Therefore, sciadopitysin may prevent the development of diabetic osteopathy.
    Free Radical Research 03/2014; 48(7). DOI:10.3109/10715762.2014.903562 · 2.99 Impact Factor
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    ABSTRACT: Androgenetic alopecia (AGA) is the most common type of hair loss, and is characterized by the transformation of terminal scalp hair into vellus hair. The epidemiology of AGA is not fully understood. A strong genetic basis has long been identified, although little is known of its nongenetic causes. To evaluate the association of AGA with a number of environmental factors, including smoking, drinking and sleeping habit. In total, 3114 Korean individuals with AGA who attended any one of 17 dermatology clinics in 6 cities in South Korea between March 2011 and February 2012 were enrolled in the study. Epidemiologic a data were collected using a standard questionnaire. No association was seen between eating or sleeping habits and severity of hair loss. However, drinking and smoking were associated with the severity of AGA in male patients. We also found that patients of both genders with a family history had more advanced types of hair loss, and the age of onset of AGA in male patients with a family history was earlier than that in male patients without a family history. Although the evidence for an environmental influence on AGA remains very weak, we did find an association between hair loss severity and certain environmental factors, such as smoking and drinking. Family history with more severe hair loss and an earlier age of onset.
    Clinical and Experimental Dermatology 01/2014; 39(1):25-9. DOI:10.1111/ced.12229 · 1.23 Impact Factor
  • Radiotherapy and Oncology 01/2014; 111:S82-S83. DOI:10.1016/S0167-8140(15)31401-8 · 4.86 Impact Factor
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    ABSTRACT: The Arabidopsis gene AVP1 encodes a vacuolar H+-translocating inorganic pyrophosphatase (enzyme classification (EC) that functions as an electronic proton pump in the vacuolar membrane and affects growth development and the stress response in plants. The current study was conducted to evaluate the molecular properties of the Arabidopsis thaliana vacuolar H+-pyrophosphatase (AVP1) gene in rice (Oryza sativa L.). Incorporation and expression of the transgene was confirmed by semi-quantitative reverse-transcription polymerase chain reaction (RT-PCR) and quantitative real-time PCR. Expression of the AVP1 gene in transgenic rice plants (TRP1 and TRP2) resulted in a significantly enhanced tolerance to 5.8 g/l NaCl under greenhouse conditions when compared with the control wild-type (WT) rice plants. Augmented AVP1 expression in the transgenic rice plants (TRP) also affected total biomass and improved ion homoeostasis through increased accumulation of Na+ ions in whole tissues when compared with control WT rice plants under high salinity conditions. The photochemical yield (Fv/Fm) values of TRP were higher than those of the WT rice plants, even though the values decreased over time in both the WT and transgenic (TRP1 to TRP8) rice plants. Furthermore, rice grain yield and biomass of the TRP were at least 15% higher based on culm and root weights, and panicle and spikelet numbers when compared with those of the WT rice plants during the 2010 and 2010 growing seasons in South Korea. Thus, these results suggest that ectopic AVP1 expression conferred tolerance and stress resistance to genetically modified transgenic crop plants by improving cellular ion homoeostasis in response to saline conditions, which enhanced rice yield and biomass under natural conditions in paddy fields.
    The Journal of Agricultural Science 12/2013; 152(06):941-953. DOI:10.1017/S0021859613000671 · 2.89 Impact Factor
  • K.-J. Baek · D.-H. Lee · Y.-S. Kim · K.-Y. Na
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    ABSTRACT: A high-voltage extended drain MOS (EDMOS) transistor with a dual work function gate (DWFG) is discussed. This device enhances device performance by modifying the electric field in the channel. For DWFG EDMOS device fabrication, the polycrystalline silicon gates on the source and drain sides are doped by p + and n + ion implantation, respectively. Experimental results from the fabricated DWFG EDMOS devices show improved transconductance (gm), drain conductance (gds) and specific on-resistance (RON) characteristics without breakdown voltage reduction.
    Electronics Letters 11/2013; 49(23):1486-1487. DOI:10.1049/el.2013.1301 · 1.07 Impact Factor
  • S M Lim · H Chang · M J Yoon · Y K Hong · H Kim · W Y Chung · C S Park · K H Nam · S W Kang · M K Kim · [...] · S H Lee · H G Kim · I I Na · Y S Kim · M Y Choi · J G Kim · K U Park · H J Yun · J H Kim · B C Cho
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    ABSTRACT: This phase II study investigated the efficacy and safety of everolimus, an inhibitor of mammalian target of rapamycin (mTOR), in locally advanced or metastatic thyroid cancer. Patients with thyroid cancer of any histology that was resistant or not appropriate for (131)I received everolimus 10 mg daily orally until unacceptable toxicity or disease progression. The primary end point was disease control rate [partial response (PR) + stable response ≥12 weeks]. Secondary end points included response rates, clinical benefit (PD + durable stable disease (SD)], progression-free survival (PFS), overall survival, duration of response, and safety. Thirty-eight of 40 enrolled patients were evaluable for efficacy. The disease control rate was 81% and two (5%) patients achieved objective response; their duration of response was 21+ and 24+ weeks. Stable disease (SD) and progressive disease was reported in 76% and 17% of patients, respectively. Seventeen (45%) patients showed durable SD (≥24 weeks) and clinical benefit was reported in 19 (50%) patients. Median PFS was 47 weeks [95% confidence interval (CI) 14.9-78.5]. Calcitonin, CEA, and thyroglobulin concentrations were ≥50% lower than baseline in three (30%) and four (44%) patients with medullary thyroid cancer and five (33%) patients with PTC, respectively. The most common treatment-related adverse events were mucositis (84%), anorexia (44%), and aspartate transaminase/alanine transaminase elevation (26%). Everolimus had a limited activity with low response rate in locally advanced or metastatic thyroid cancer. Reasonable clinical benefit rate and safety profile may warrant further investigation. NCT01164176.
    Annals of Oncology 09/2013; 24(12). DOI:10.1093/annonc/mdt379 · 6.58 Impact Factor
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    ABSTRACT: In this study, a wire/wireless communication system transmitting the operation data of engine from the ER (Engine Room) to the engine controller of ECR(Engine Control Room) has been developed through the communication of ISM(Industrial Science Medical) Band for the test operation environment improvement of medium speed engine. This wire/wireless communication system is composed of the RTU (Remote Terminal Unit) gathering and transmitting engine data as well as the MCU (Master Control Unit) receiving engine status information from the RTU to be sent to the engine controller (PLC). Through this study, a trial product of RTU and MCU has been manufactured. A test bench that has made temperature, pressure and pick-up sensor into a module for the local test of prototype was produced a test bench. In addition, at the same time save the data to a Web server and the smart phone real-time monitoring system has been developed using Wi-Fi communications. The ultimate objective of this study is to develop a wireless smart phone monitoring system of engine for the operator of engine to be able to monitor and control engine status even from the outside of engine room and control room based on this study.
    06/2013; 10(2). DOI:10.7839/ksfc.2013.10.2.007
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    MS Lee · KH Park · MH Jung · YS Kim
    06/2013; 2(1). DOI:10.1186/2047-2994-2-S1-P11
  • K.-J. Baek · J.-M. Gim · H.-S. Kim · K.-Y. Na · N.-S. Kim · Y.-S. Kim
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    ABSTRACT: A new analogue circuit design methodology using independently optimised self-cascode (SC) structures is proposed. Based on the concept of the dual-workfunction-gate structures, which are equivalent to SC structures, transconductance and output resistance optimised SC MOSFETs were used in the differential input and output stages, respectively. An operational amplifier (opamp) with the proposed design methodology using standard 0.18 μm CMOS technology was designed to provide better performance. The measured DC gain of the fabricated opamp with independently-optimised SC MOSFETs was approximately 12 dB higher than that of the conventional opamp.
    Electronics Letters 04/2013; 49(9):591-592. DOI:10.1049/el.2013.0554 · 1.07 Impact Factor
  • Y.-S. Kim · S.-W. Choi · J.-H. Park · Eun Bok · B.-K. Kim · S.-H. Hong
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    ABSTRACT: Red-emitting (SrxCa1-x)AlSiN3:Eu2+ (SCASN:Eu2+) phosphors were successfully prepared by spark plasma sintering (SPS) at a relatively low temperature of 1700 degrees C in vacuum (200 mtorr). The synthesized phosphors showed a broad absorption band from near UV to yellow region (300 similar to 600 nm) and exhibited a single broad emission band centered at 626 similar to 653 nm under the excitation of 450 nm. The effects of Sr occupancy and Eu doping concentration on the photoluminescence (PL) properties of SCASN:Eu2+ phosphors were examined. In addition, the temperature dependence of the PL intensity and the emission characteristics of white light-emitting InGaN-based beta-sialon:Eu2+/SCASN:Eu2+ LED were compared with those of commercial YAG:Ce3+ phosphor and InGaN-based YAG:Ce3+ LED, respectively. (C) 2012 The Electrochemical Society.
    11/2012; 2(2):R3021-R3025. DOI:10.1149/2.008302jss
  • K.-Y. Na · K.-J. Baek · G.-W. Lee · Y.-S. Kim
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    ABSTRACT: An embedded non-volatile memory cell solution with a top-floating-gate structure for power management integrated circuit applications is presented. The cell is fabricated by high-voltage CMOS process (20 V) with low-voltage CMOS devices (5 V) and a PIP capacitor, without additional processing steps or extra photomasks. The fabricated cell shows stable endurance characteristics up to 103 cycles. The charge retention at 85°C is less than 0.5°V after 103 cycles stress.
    Electronics Letters 11/2012; 48(24):1557-1559. DOI:10.1049/el.2012.3041 · 1.07 Impact Factor
  • M.H. Jung · Y.S. Kim · Y.I. Ji
    Journal of Minimally Invasive Gynecology 11/2012; 19(6):S151. DOI:10.1016/j.jmig.2012.08.414 · 1.58 Impact Factor
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    ABSTRACT: We report the fabrication and characteristic analysis of ZnO thin film transistors (TFTs) having two different active layer thicknesses such as 40nm and 80nm, using RF magnetron sputter. At first, there is a positive voltage shift in all devices under the gate-bias stress, which is more manifest in TFTs with active layer thickness of 40 nm than 80nm. However, when the stress bias is removed, all ZnO TFTs recover their original characteristics, which are regarded as a result of rather preexisting traps than created traps. In addition, it is known that the thinner active layer thickness is, the smaller grain size is through XRD analysis. In order to clarify the comparison of preexisting traps according to the active layer thickness, the grain boundary traps by Levinson's model and Hooge's parameters by Hooge's model are extracted. From above results, TFTs with active layer thickness of 40 nm exposes higher grain boundary trap density and Hooge's parameter value. Consequently, we can see that the number of preexisting traps in the device increases in accordance with the decrease in the grain size.
    12/2011; DOI:10.1063/1.3666662

Publication Stats

11k Citations
1,941.88 Total Impact Points


  • 1998–2014
    • Kyungpook National University
      • • Department of Animal Science and Biotechnology
      • • College of Natural Sciences
      • • Department of Oral Physiology
      Daikyū, Daegu, South Korea
    • Inha University
      Chemulpo, Incheon, South Korea
    • University of California, San Diego
      • Department of Radiology
      San Diego, CA, United States
    • Chungnam National University
      • Department of Biochemistry
      Daiden, Daejeon, South Korea
    • Tohoku University
      • Department of Communication Engineering
      Miyagi, Japan
  • 2013
    • Kosin University
      Tsau-liang-hai, Busan, South Korea
  • 2007–2013
    • Chungbuk National University
      Chinsen, Chungcheongbuk-do, South Korea
  • 1998–2013
    • Ulsan University Hospital
      Urusan, Ulsan, South Korea
  • 1995–2012
    • Seoul National University
      • • Department of Materials Science and Engineering
      • • Department of Obstetrics and Gynecology
      • • College of Medicine
      • • Department of Pharmacology
      • • Department of Pathology
      • • Department of Internal Medicine
      Sŏul, Seoul, South Korea
    • Kanazawa Medical University
      • Department of Pathology
      Kanazawa-shi, Ishikawa-ken, Japan
    • Pohang University of Science and Technology
      • Pohang Accelerator Laboratory
      Geijitsu, Gyeongsangbuk-do, South Korea
    • International St. Mary's Hospitals
      Chemulpo, Incheon, South Korea
  • 1999–2008
    • Korea University
      • • Department of Chemical and Biological Engineering
      • • Department of Computer and Communications Engineering
      Sŏul, Seoul, South Korea
    • Kyoto University
      • Department of Materials Science and Engineering
      Kyoto, Kyoto-fu, Japan
    • Hallym University Medical Center
      Sŏul, Seoul, South Korea
    • Wonkwang University
      • College of Pharmacy
      Riri, Jeollabuk-do, South Korea
  • 1997–2007
    • Korea Advanced Institute of Science and Technology
      • Department of Biological Sciences
      Sŏul, Seoul, South Korea
    • Soon Chun Hyang University Hospital
      • Department of Gastroenterology
      Sŏul, Seoul, South Korea
    • Ajou University
      • Department of Gastroenterology
      Sŏul, Seoul, South Korea
    • Korea Research Institute of Chemical Technology
      Daiden, Daejeon, South Korea
  • 2000–2005
    • Hongik University
      • • Department of Materials Science and Engineering
      • • Department of Science
      Sŏul, Seoul, South Korea
    • Minneapolis Veterans Affairs Hospital
      Minneapolis, Minnesota, United States
    • Kunsan National University
      • Department of Physics
      Gunzan, North Jeolla, South Korea
  • 2004
    • University of Manitoba
      • Department of Electrical and Computer Engineering
      Winnipeg, Manitoba, Canada
  • 1992–2004
    • Yonsei University
      • • Department of Internal Medicine
      • • Department of Surgery
      • • Department of Biochemistry
      Sŏul, Seoul, South Korea
  • 2001–2003
    • Kookmin University
      Sŏul, Seoul, South Korea
    • Asan Medical Center
      Sŏul, Seoul, South Korea
    • Korean Institute of Geoscience and Mineral Resources
      Sŏul, Seoul, South Korea
    • Pukyong National University
      • Department of Refrigeration and Air-Conditioning Engineering
      Tsau-liang-hai, Busan, South Korea
    • Chosun University
      Gwangju, Gwangju, South Korea
  • 1996–2003
    • Hanyang University
      • • College of Medicine
      • • Major in Internal Medicine
      Sŏul, Seoul, South Korea
  • 2002
    • Hyundai Heavy Industries
      Urusan, Ulsan, South Korea
  • 2001–2002
    • Korea Basic Science Institute KBSI
      Sŏul, Seoul, South Korea
  • 2000–2002
    • Pusan National University
      • • Department of Microbiology
      • • College of Medicine
      • • Department of Dermatology
      Tsau-liang-hai, Busan, South Korea
  • 1996–2002
    • Catholic University of Korea
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
  • 1995–2002
    • Seoul National University Hospital
      • • Department of Internal Medicine
      • • Department of Neuropsychiatry
      Sŏul, Seoul, South Korea
  • 1999–2001
    • Hanyang University Medical Center
      Sŏul, Seoul, South Korea
  • 1998–2001
    • Chonnam National University
      • • Center for Ligand and Transcription
      • • Department of Biology
      Gwangju, Gwangju, South Korea
  • 1996–2001
    • Hallym University
      • College of Medicine
      Seoul, Seoul, South Korea
    • Chonbuk National University
      • Semiconductor Physics Research Center
      Seoul, Seoul, South Korea
  • 1979–2001
    • University of California, San Francisco
      • • Veterans Affairs Medical Center
      • • Department of Medicine
      • • Division of Gastroenterology
      • • Department of Anatomy
      • • Division of Hospital Medicine
      San Francisco, CA, United States
    • University of California, Davis
      • Area of Biophysical Chemistry
      Davis, California, United States
  • 1998–2000
    • Korea Research Institute of Bioscience and Biotechnology KRIBB
      • • Genome Research Center
      • • Plant Cell and Molecular Biology Research Unit
      Anzan, Gyeonggi-do, South Korea
  • 1980–2000
    • San Francisco VA Medical Center
      San Francisco, California, United States
  • 1996–1999
    • Chung-Ang University
      • • College of Medicine
      • • Department of Physics
      Sŏul, Seoul, South Korea
  • 1992–1999
    • Yonsei University Hospital
      • • Department of Internal Medicine
      • • Surgery
      Seoul, Seoul, South Korea
  • 1995–1996
    • Soonchunhyang University
      • College of Medicine
      Asan, South Chungcheong, South Korea
  • 1994–1995
    • Soroka Medical Center
      • Department of Gastroenterology
      Be'er Sheva`, Southern District, Israel
    • Cardiovascular Research Foundation
      New York, New York, United States
  • 1993
    • Osaka University
      • Department of Surgery
      Suika, Ōsaka, Japan
  • 1991
    • Kyung Hee University
      • Department of Medicine
      Seoul, Seoul, South Korea
  • 1987–1990
    • New York State Institute for Basic Research in Developmental Disabilities
      • Department of Psychology
      New York, New York, United States
  • 1985
    • The University of Chicago Medical Center
      • Department of Medicine
      Chicago, Illinois, United States
  • 1983
    • University of British Columbia - Vancouver
      • Department of Medicine
      Vancouver, British Columbia, Canada