Yewon Kim

Abstract While investigating multiphase flows experimentally, the spatiotemporal variation in the interfacial shape between different phases must be measured to analyze the transport phenomena. For this, numerous image processing techniques have been proposed, showing good performance. However, they require trial-and-error optimization of thresholding parameters, which are not universal for all experimental conditions; thus, their accuracy is highly dependent on human experience, and the overall

PURPOSE: To investigate changes in the clinical features of patients with dry eye disease (DED) according to short-term outdoor ground-level ozone exposure. METHODS: This prospective observational study included patients with DED who were treated with the same topical drugs (0.05% cyclosporine or 3% diquafosol) and visited the hospital twice at 2-month intervals. Patients who showed a short tear film breakup time and positive ocular surface staining were assigned to the diquafosol and cyclospori

주가붕괴(stock price crash)는 경영자들이 악재(bad news)를 호재(good news)에 비해 지연하여 공시하는 성향으로 인해 악재가 누적되었다가 한꺼번에 시장에 알려질 때 주가가 폭락하는 현상을 말한다. 본 연구는 기업의 관점에서 주가붕괴의 발생 원인 및 결과에 초점을 맞추는 선행연구를 확장하여 주가붕괴에 대한 투자자의 반응을 살펴보았다. 주가붕괴는 투자자들이 기업의 기회주의적 공시 행태를 인지하는 계기가 되어 투자자들의 해당 기업에 대한 신뢰도를 저해한다. 이는 해당 기업이 발표하는 회계정보에 대한 투자자들의 의존도를 하락시킬 수 있으며, 특히 이익 정보에 대해 주가가 반응하는 정도를 나타내는 이익반응계수(earnings response coefficient)가 하락할 것으로 예측할 수 있다. 2007년부터 2018년까지의 국내 자료를 이용한 실증분석 결과는 이러한 예측을 지지한다. 본 연구의 발견은 주가붕괴가 그 자체로 기업 및 투자자들에게 큰 경제적 손실을

Migraine is a common neurological disorder that occurs in approximately 12% of adults in western countries and can significantly impair the quality of life of the patients. In Korea, 6.1% of the population suffers from migraine headaches at least once a year, and women roughly have three times higher incidence of migraine than men. It is most frequent in women aged 40-49 years and men aged 19-29 years. his neurological disorder has a broad range of severity and symptoms; it is a unilateral, puls

BACKGROUND: Chronic obstructive pulmonary disease (COPD) is a chronic respiratory disease characterized by persistent airflow limitation. Therefore, both work ability and workday length may be affected in individuals with this disease. We studied a worker with suspected COPD and assessed fitness to work using post-bronchodilator spirometry, symptom assessment scales, and the exercise stress test. CASE REPORT: The patient was a 58-year-old man due to work as a field supervisor in the ship constru

Inflammatory abdominal aortic aneurysms (IAAAs) are rare large-vessel pathology, with potentially life-threatening complications including obstructive uropathy secondary to retroperitoneal fibrosis. Comprising a small proportion of all AAA, their pathogenesis remains unknown, with the hypothesis of infective and immunological aetiologies circulating in current literature. Management principles of IAAAs aim at prevention of aortic rupture and include open-surgical or endovascular therapies. Due t

Abstract We investigate the information benefits from R&D capitalization by focusing on the role of financial analysts in mitigating information asymmetry. Using a large sample of Korean firms, we find a positive association between analyst coverage and the market valuation of expensed R&D indicating that an analyst's activities can help investors to understand the implications of R&D investments. In contrast, analyst coverage does not significantly improve the valuation of capitaliz

This study investigates managerial ability’s effect on firms’ earnings response coefficients (ERCs). We find that ERC increases with managerial ability, suggesting that investors more favorably perceive earnings from competent managers. Further, managerial ability influences ERC via the information environment; the influence is positive only for firms with better information environments. Meanwhile, since foreign investors have incentive to improve the information environment to overcome their i