Search results for: Kyung Hee Ko

Items from 1 to 17 out of 17 results

article

Can enhancement types on preoperative MRI reflect prognostic factors and surgical outcomes in invasive breast cancer?

Jieun Koh, Ah Young Park, Kyung Hee Ko, Hae Kyoung Jung

European Radiology > 2019 > 29 > 12 > 7000-7008

Objectives This study was conducted in order to evaluate whether enhancement types on preoperative MRI can reflect prognostic factors and surgical outcomes in invasive breast cancer. Methods Among 484 consecutive patients who underwent preoperative breast MRI from October 2014 to July 2017 for biopsy-proven breast cancer, 313 patients with 315 invasive breast cancers who underwent subsequent surgery...

article

The antipsychotic agent clozapine induces autophagy via the AMPK-ULK1-Beclin1 signaling pathway in the rat frontal cortex

Se Hyun Kim, Soyoung Park, Hyun Sook Yu, Kyung Hee Ko, more

Progress in Neuro-Psychopharmacology and Biological Psychiatry > 2018 > 81 > C > 96-104

Clozapine, a representative atypical antipsychotic, has superior efficacy compared to other antipsychotic agents and is used for the treatment of severe psychotic disorders. Therefore, studies on its mechanisms of action are important for understanding the mechanisms of therapeutic approaches to psychosis. Adenosine monophosphate-activated protein kinase (AMPK) is a serine–threonine kinase that plays...

article

Mammography, US, and MRI for Preoperative Prediction of Extensive Intraductal Component of Invasive Breast Cancer: Interobserver Variability and Performances

Hye Rin Kim, Hae Kyoung Jung, Kyung Hee Ko, So Jung Kim, more

Clinical Breast Cancer > 2016 > 16 > 4 > 305-311

Interobserver variability and performances of imaging studies for predicting an extensive intraductal component (EIC) of invasive breast cancer have not been well established.Two independent readers retrospectively reviewed every preoperative mammography, ultrasonography (US), and magnetic resonance imaging (MRI) studies of 145 breast cancers in 144 patients with surgically confirmed EIC status and...

article

Potential role of shear-wave ultrasound elastography for the differential diagnosis of breast non-mass lesions: preliminary report

Kyung Hee Ko, Hae Kyoung Jung, So Joong Kim, Hyerin Kim, more

European Radiology > 2014 > 24 > 2 > 305-311

Objectives To report our preliminary experience with shear-wave elastography (SWE) for non-mass lesions (NMLs) in the breast and suggest a potential ancillary role of SWE for BI-RADS Category 4a NMLs in reducing the number of unnecessary benign biopsies. Methods A total of 310 breast lesions in 286 consecutive women who had been scheduled for US-guided automated gun biopsy or vacuum-assisted biopsy...

article

Qualitative pattern classification of shear wave elastography for breast masses: How it correlates to quantitative measurements

Jung Hyun Yoon, Kyung Hee Ko, Hae Kyoung Jung, Jong Tae Lee

European Journal of Radiology > 2013 > 82 > 12 > 2199-2204

To determine the correlation of qualitative shear wave elastography (SWE) pattern classification to quantitative SWE measurements and whether it is representative of quantitative SWE values with similar performances.From October 2012 to January 2013, 267 breast masses of 236 women (mean age: 45.12±10.54 years, range: 21–88 years) who had undergone ultrasonography (US), SWE, and subsequent biopsy were...

article

Diagnostic performances of shear wave elastography: which parameter to use in differential diagnosis of solid breast masses?

Eun Jung Lee, Hae Kyoung Jung, Kyung Hee Ko, Jong Tae Lee, more

European Radiology > 2013 > 23 > 7 > 1803-1811

Objective To evaluate which shear wave elastography (SWE) parameter proves most accurate in the differential diagnosis of solid breast masses. Methods One hundred and fifty-six breast lesions in 139 consecutive women (mean age: 43.54 ± 9.94 years, range 21–88 years), who had been scheduled for ultrasound-guided breast biopsy, were included. Conventional ultrasound and SWE were performed in all women...

article

Shear-wave elastography in the diagnosis of solid breast masses: what leads to false-negative or false-positive results?

Jung Hyun Yoon, Hae Kyoung Jung, Jong Tae Lee, Kyung Hee Ko

European Radiology > 2013 > 23 > 9 > 2432-2440

Objective To investigate the factors that have an effect on false-positive or false-negative shear-wave elastography (SWE) results in solid breast masses. Methods From June to December 2012, 222 breast lesions of 199 consecutive women (mean age: 45.3 ± 10.1 years; range, 21 to 88 years) who had been scheduled for biopsy or surgical excision were included. Greyscale ultrasound and SWE were performed...

article

Potential Application of Ultrasound-Guided Vacuum-Assisted Excision (US-VAE) for Well-selected Intraductal Papillomas of the Breast: Single-Institutional Experiences

Kyung Hee Ko, Hye Kyoung Jung, Ji Hyun Youk, Kyung Po Lee

Annals of Surgical Oncology > 2012 > 19 > 3 > 908-913

Background The study objective was to evaluate our experiences of ultrasound-guided vacuum-assisted excision (US-VAE) of benign intraductal papillomas, and to discuss its potential application as a minimally invasive treatment Methods We reviewed the sonographic and histologic features of 29 benign intraductal papillomas removed by US-VAE. The procedure was recommended on the basis of our indications...

article

1469: Sonographic Features of Augmented Breast with Direct Injection of Various Materials

Ji Hyun Youk, Eun-Kyung Kim, Eun Ju Son, Kyung Hee Ko, more

Ultrasound in Medicine & Biology > 2009 > 35 > 8 Supplement > S226-S227

article

1468: Atypical Papilloma Diagnosed at US-Guided 14-Gauge Core Needle Biopsy of Breast Mass

Ji Hyun Youk, Eun-Kyung Kim, Kyung Hee Ko, Min Jung Kim, more

Ultrasound in Medicine & Biology > 2009 > 35 > 8 Supplement > S226

article

1094: Factors Influencing the Recurrence after US Mammotome Excision of Probable Benign Breast Lesions

Kyung Hee Ko, Ji Hyun Youk, Eun Ju Son

Ultrasound in Medicine & Biology > 2009 > 35 > 8 Supplement > S123

article

Improved cryopreservation of bovine preimplantation embryos cultured in chemically defined medium

Kwang Taek Lim, Goo Jang, Kyung Hee Ko, Won Wou Lee, more

Animal Reproduction Science > 2008 > 103 > 3-4 > 239-248

The aim of this study was to examine the effects of modifications to a standard slow freezing protocol on the viability of in vitro produced bovine embryos. Bovine oocytes were matured, fertilized with frozen-thawed semen, and presumptive zygotes cultured in defined two-step culture media. The standard freezing medium was 1.5M ethylene glycol (EG), 0.1M sucrose, 10% fetal bovine serum (FBS) in Dulbecco's...

article

Improved in vitro bovine embryo development and increased efficiency in producing viable calves using defined media

Kwang Taek Lim, Goo Jang, Kyung Hee Ko, Won Wou Lee, more

Theriogenology > 2007 > 67 > 2 > 293-302

In this study, we developed a defined culture medium that supported improved in vitro bovine embryo development and calving rate after embryo transfer (ET). In vitro-matured bovine oocytes from abbatoir-derived ovaries from Korean native, HanWoo cattle were fertilized with frozen–thawed spermatozoa and embryos were cultured in two-step culture media. In Experiment 1, embryos were cultured in media...

article

Electrical and optical properties of ZnO transparent conducting films by the sol-gel method

Jin-Hong Lee, Kyung-Hee Ko, Byung-Ok Park

Journal of Crystal Growth > 2003 > 247 > 1-2 > 119-125

The effect of drying conditions and the first- and second-heat treatment on the structural, electrical and optical properties of ZnO thin films prepared by the sol-gel method was investigated. ZnO films were deposited on silica glass substrates by the spin-coating method. Zinc acetate dihydrate, 2-methoxyethanol and monoethanolamine were used as a starting material, solvent and stabilizer, respectively...

article

Role of signals from the dorsal root ganglion in neuropathic pain in a rat model

Heung Sik Na, Kyung Hee Ko, Seung Keun Back, Backil Sung, more

Neuroscience Letters > 2000 > 288 > 2 > 147-150

We examined whether signals from the neuroma or the dorsal root ganglion of the injured segment are critical for the generation of neuropathic pain. To this aim, we used a rat model of peripheral neuropathy made by transecting the inferior and superior caudal trunks at the level between the S1 and S2 spinal nerves under enflurane anesthesia. These animals displayed tail-withdrawal responses to normally...

article

Performance analysis of carousel systems with double shuttle

Hark Hwang, Chae-soo Kim, Kyung-hee Ko

Computers & Industrial Engineering > 1999 > 36 > 2 > 473-485

This paper deals with automated carousel systems which have been widely used in various industrial applications. We attempt to measure analytically the effects of double shuttle of the storage/retrieval machine on the throughput of standard and double carousel systems. For the double carousel system, a retrieval sequencing rule is proposed which utilizes the characteristics of two independently rotating...

article

LCG Moves in Crystallizations

Hyun Jong Song, Young Ho Im, Kyung Hee Ko

Geometriae Dedicata > 1999 > 76 > 3 > 229-251

From a point of view of crystallizations as extended Heegaard diagrams, we introduce LCG (≡ linear cut and glue) moves with which we investigate relations between geometric T-transformations and crystallization moves. As applications of LCG moves, we verify various equivalences of Lins' crystallizations r _i ⁿ by means of LCG moves. In particular, we show that the two inequivalent Heegaard splittings...

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