Hyung Seok Lee

Learn More
Squamous cell carcinoma of the head and neck (SCCHN), which is relatively prevalent in Korea, is believed to be induced by environmental carcinogens and host genetic factors. Accumulating evidence has shown that genetic differences in DNA repair capacity resulting from genetic polymorphism influence the risk of environmental carcinogenesis. We therefore(More)
Recently, Dielectric Elastomer Actuator(DEA) comes to the market successfully by introducing commercial products such as tactile interfaces for mobile applications. As an advanced application, we present a tactile display device actuated with dielectric elastomer actuator(DEA) in this paper. By employing fluid coupling between the touch spot and the(More)
The purpose of this paper is to verify the relationships among service quality, perceived value, customer satisfaction, and customer loyalty in mobile phone service. The study conducted an empirical research. A total of 384 mobile phone users' responses were collected from Seoul in Korea. The findings show that service quality positively influences customer(More)
OBJECTIVES The Web-based integrated public healthcare information system (PHIS) of Korea was planned and developed from 2005 to 2010, and it is being used in 3,501 regional health organizations. This paper introduces and discusses development and performance of the system. METHODS We reviewed and examined documents about the development process and(More)
This paper estimates the value of Internet information by using the hedonic price model (HPM). We specify a hedonic price function, and measure the consumer's willingness to pay for attributes to the Internet connection charge. We also identify a functional form for the HPM by using the Box–Cox transformation of the variables in our analysis. Our results(More)
INTRODUCTION Predictive factors for myasthenic crisis after transsternal thymectomy have been reported, but little is known about myasthenic crisis after videoscopic thymectomy (MCAVT). METHODS We investigated 146 myasthenia gravis patients who underwent videoscopic thymectomy. RESULTS Patients with MCAVT had a lower forced vital capacity (FVC) (2.1 vs.(More)
OBJECTIVES To evaluate the necessity of preserving the posterior branch of the great auricular nerve during parotidectomy. STUDY DESIGN AND SETTING Forty-six patients undergoing parotidectomy were prospectively analyzed. Twenty-four patients had preservation of the posterior branch of the great auricular nerve; in the remaining 22 patients the nerve was(More)
We have developed a modified optical frequency domain imaging (OFDI) system that performs parallel imaging of three-dimensional (3D) surface profiles by using the space division multiplexing (SDM) method with dual-area swept sourced beams. We have also demonstrated that 3D surface information for two different areas could be well obtained in a same time(More)
Advances in wireless technology have expanded the existing internet environment and accelerated the rapid development of mobile service. Many previous studies were conducted on users' needs and satisfaction prior to the expansion of the mobile service.Thus, the impact of mobile service factors on user satisfaction has important implications for both(More)
BACKGROUND Spinal cord involvement in Behçet's disease is not well studied. OBJECTIVE To evaluate the clinical, laboratory and magnetic resonance imaging characteristics of spinal cord involvement in Behçet's disease. METHODS We retrospectively reviewed 10 spinal cord involvements in seven patients with Behçet's disease. RESULTS The median age of(More)