Hyo S. Lee

Cheil General Hospital and Women's Healthcare Center

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Soon Hyung Hong

Korea Advanced Institute of Science and Technology

Byung‐Joo Park

Seoul National University

Kyung H Na

Korea Institute of Industrial Technology

Woo C. Lee

Won Kim

Seoul National University

I. Nakatani

National Institute for Materials Science

Duk Jae Yoon

Korea Institute of Industrial Technology

T. Furubayashi

National Institute for Materials Science

Se H Kim

Soonchunhyang University

Yeung K. Kim

Kangnam University

Cooperative Institutions

Seoul National University

Seoul National University Hospital

New Generation University College

Yonsei University

Korea Advanced Institute of Science and Technology

National University College

Seoul National University Bundang Hospital

Korea University

Korea Institute of Industrial Technology

National Institute for Materials Science

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On the chemical stability of iron-nitride magnetic fluids in atmospheric conditions

Journal of Magnetism and Magnetic Materials (1999)

Hyo S. Lee I. Nakatani

Maghemite

Iron nitride

Saturation (graph theory)

10.1016/s0304-8853(99)00126-2

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Citations (16)

A comparison of coprecipitation with microemulsion methods in the preparation of magnetite

Journal of Applied Physics (1999)

Hyo S. Lee Woo C. Lee T. Furubayashi

Coprecipitation and microemulsion were used to prepare nanosized magnetite. The average particle sizes of samples A and B were calculated by Brunauer–Emmett–Teller analysis and are 8.16 and 2.24 nm, respectively. The saturation magnetization of sample A at 300 K was 57.2 emu/g, but sample B was not saturated even 7.0 T. The blocking temperature for sample B was 17 K and the crystalline anisotropy energy was 1.2×105 J/m3. At 5 K, sample B is ferrimagnetic with σs=7.62 emu/g. This value is much lower than the σs=65.4 emu/g of the crystallized sample A at 50 K. Mössbauer spectra showed that sample A was ferrimagnetic at room temperature, but sample B was superparamagnetic at T>Tb (critical blocking temperature).

Coprecipitation

Ferrimagnetism

Superparamagnetism

Microemulsion

Anisotropy energy

10.1063/1.369953

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Citations (45)

Visceral adipose tissue area is an independent risk factor for hepatic steatosis

Journal of Gastroenterology and Hepatology (2007)

Byung‐Joo Park Yoon Jun Kim Donghee Kim Won Kim Yong J Jung

Abstract Background and Aim: Recent data indicate that hepatic steatosis is associated with insulin resistance, dyslipidemia and obesity (especially central body fat distribution). There have been few studies on the correlation between biopsy‐proven hepatic steatosis and the above factors in a disease‐free population. The aim of the present study was to evaluate the relation between hepatic steatosis assessed by biopsy and clinical characteristics including regional fat distribution measured by computed tomography (CT) in living liver donors. Methods: Laboratory data, liver/spleen Hounsfield ratio (L/S ratio), regional fat distribution by CT and liver status by biopsy were evaluated retrospectively in a total of 177 living liver donors without a history of alcohol intake. Results: The unpaired t ‐test showed that age, triglycerides (TG), high density lipoprotein, total cholesterol, alanine aminotransferase, body mass index, L/S ratio, visceral adipose tissue area (VAT) and subcutaneous adipose tissue area (SAT) were associated with hepatic steatosis. In the multiple logistic regression analysis, VAT (odds ratio 1.031, 95% CI 1.013–1.048, P < 0.01) and TG (odds ratio 1.012, 95% CI 1.004–1.020, P < 0.01) were independent risk factors of hepatic steatosis. Subgroup analysis also showed that VAT was an independent risk factor in men (odds ratio 1.022, 95% CI 1.003–1.041, P < 0.05) and women (odds ratio 1.086, 95% CI 1.010–1.168, P < 0.05). Conclusion: Our results suggest that visceral abdominal adiposity is correlated with hepatic steatosis in healthy living liver donors.

Steatosis

Dyslipidemia

10.1111/j.1440-1746.2007.05212.x

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Citations (150)

Journal of Materials Science (2002)

Hyo S. Lee Soon Hyung Hong Jae R. Lee Yeung K. Kim

Honeycomb structure

Honeycomb

10.1023/a:1014344228141

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Citations (59)

The fabrication process and mechanical properties of SiCp/Al–Si metal matrix composites for automobile air-conditioner compressor pistons

Journal of Materials Processing Technology (2001)

Hyo S. Lee Jae Seong Yeo Soon Hyung Hong Duk Jae Yoon Kyung H Na

Metal matrix composite

10.1016/s0924-0136(01)00680-x

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Citations (121)

Clinical, Hormonal, and Genetic Evaluation of Idiopathic Nonobstructive Azoospermia and Klinefelter Syndrome Patients

Cytogenetic and Genome Research (2017)

Shin Y. Kim Bom Y. Lee Ah Rum Oh So Yeon Park Hyo S. Lee

To investigate the clinical, hormonal, and genetic factors in infertile men with idiopathic nonobstructive azoospermia (NOA) or azoospermic Klinefelter syndrome (KFS), a total of 556 and 96 patients, respectively, were included in this study. All patient samples were analyzed cytogenetically. Serum reproductive hormone levels were measured. Microdeletions in the azoospermia factor (AZF) region of the Y chromosome were detected by multiplex PCR using 16 specific sequence-tagged sites. FSH and LH levels in both NOA and KFS patients were significantly higher than the normal range, and the testosterone level in KFS patients was significantly lower. Ninety-two (95.8%) of the KFS patients showed non-mosaic 47,XXY karyotypes and 47,XXY,inv(9)(p11.1q13); the other KFS patients had mosaic karyotypes of 47,XXY/46,XY, 47,XXY/46,XX, and 47,XXY/48,XXXY/46,XX. Among the 556 idiopathic NOA patients with normal karyotypes, 67 (12.05%) had microdeletions in the AZF region of the Y chromosome. Microdeletions were most frequently detected in the AZFc region, followed by AZFa, AZFb, AZFbc, and partial AZFc deletions. However, Y chromosome microdeletions were not found in any of the azoospermic KFS patients. In view of the hormonal and genetic abnormalities in infertile men with idiopathic NOA and with azoospermic KFS, genetic testing for karyotype, Y chromosome microdeletions, and hormonal parameters is advocated.

Y chromosome microdeletion

Klinefelter syndrome

Azoospermia factor

10.1159/000487039

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Citations (17)

Major factors to the solder joint strength of ENIG layer in FC BGA package

Microelectronics Reliability (2006)

Dong-Jun Lee Hyo S. Lee

Ball grid array

Galvanic corrosion

Galvanic cell