Woo-Hyun Lee

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BACKGROUND Obstructive sleep apnea (OSA) is associated with diverse health risks, including death. However, the role of OSA as a risk factor for death has never been studied in Asians. This study is aimed at evaluating the influence of OSA on the mortality in Korean sleep clinic population. METHODS A total of 2,240 patients who underwent in-laboratory(More)
OBJECTIVES/HYPOTHESIS Sleep videofluoroscopy (SVF) has been introduced to identify upper airway obstruction. This study was aimed to determine the interrater reliability of SVF in patients with obstructive sleep apnea (OSA). STUDY DESIGN A retrospective analysis. METHODS On the basis of apnea-hypopnea index in full-night attended polysomnography, 374(More)
Retroglossal obstruction is one of the etiologies causing obstructive sleep apnea (OSA) and can be addressed by removing some tissues of the tongue base. However, because of its deep-seated location, its surgical removal is still challenging. Although coblation technique has been introduced, its efficacy and morbidity need further evaluation, particularly(More)
PageRank, a representative link-based algorithm, evaluates the importance of Web pages based on the number of inlinks each has. However, this feature may cause a problem in that pages with many in-links can be highly ranked regardless of their importance to the given query. Many methods have attempted to solve this problem by evaluating the weight of the(More)
While advanced analysis of large dataset is in high demand, data sizes have surpassed capabilities of conventional software and hardware. Hadoop framework distributes large datasets over multiple commodity servers and performs parallel computations. We discuss the I/O bottlenecks of Hadoop framework and propose methods for enhancing I/O performance. A(More)
The aim of this study was to compare coblation and diathermy techniques with respect to secondary post-tonsillectomy hemorrhage (PTH). A total of 1,397 children underwent tonsillectomies with or without adenoidectomy by a single surgeon in a single center from June 2005 through December 2011. A diathermy tonsillectomy was performed on 315 patients for the(More)
IMPORTANCE This study presents an innovative method for developing a neuromuscular model of obstructive sleep apnea (OSA). OBJECTIVE To establish a new OSA animal model simulating real upper airway conditions during sleep. DESIGN AND SETTING In vivo animal study at an academic tertiary referral center. SUBJECTS A total of 27 New Zealand white male(More)
INTRODUCTION Although tonsillectomy has a very long history as one of the most common surgical procedures in childhood, post-tonsillectomy hemorrhage is not uncommon and occasionally life threatening. Although primary post-tonsillectomy hemorrhage that occurs within 24 hours of surgery is often caused by insufficient intraoperative hemostasis, delayed(More)
OBJECTIVES/HYPOTHESIS To analyze the prevalence of adenoid regrowth at 1 year after coblation adenoidectomy using cephalometric radiography. STUDY DESIGN Retrospective analysis. METHODS One hundred eighty-eight children who underwent adenoidectomy from June 2006 through September 2010 were included. Demographic data, preoperative size of palatine(More)
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