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이형철 국립공주대학교 KNU 기업경영연구소 2026 기업경영리뷰 Vol.17 No.2
This study examines the impact of intangible returns, which are fluctuations in returns due to factors other than the fundamentals of companies, on stock liquidity for companies listed on the Korea Exchange (KRX) and KOSDAQ markets. (1) Whether the size of stock liquidity differs between companies with different sizes of intangible returns, and (2) Whether the relationship between the size of intangible returns and stock liquidity varies depending on the level of information asymmetry in the stock market. The empirical analysis is conducted by collecting data on listed companies from 1999 to 2023. Panel regression analysis is used to examine the impact of differences in intangible return variables estimated for each individual company on stock liquidity of listed companies. The results of the empirical analysis are consistent with the expectations in the hypothesis setting. In other words, it was confirmed that stock liquidity is also small when the level of intangible returns is high. In addition, it was confirmed that the negative relationship between intangible returns and stock liquidity is stronger in samples with relatively poor stock market information environments. This study is significant in that it examines the relationship between the two based on the research on intangible returns and stock liquidity that has been dealt with in various ways in previous studies, and furthermore, it confirms that the market information environment affects this relationship, and it can be said to be a contribution. It is expected that it will provide various implications not only in corporate management practice but also in academic research in the future.
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전방 외측 대퇴 유리 피판을 접어서 시행한 혀 재건의 증례 보고
이형철,김은기,Lee, Hyung-Chul,Kim, Eun-Key 대한미세수술학회 2011 Archives of reconstructive microsurgery Vol.20 No.1
Tongue reconstruction after oncologic resection with free flap is important to conserve function and shape. Vertical rectus myocutaneous free flap is usually used for total tongue reconstruction, but our patient was thin and primary closure after flap elevation seemed hard. So we used anterolateral thigh free flap to reduce donor site morbidity and to maintain bulk of the tongue as much as possible. Deepithelization of both middle side of flap and folding was done to mimic normal tongue base's shape and volume. Flap survived without complication and patient underwent concurrent chemoradiation therapy three weeks after surgery. Anterolateral thigh free flap can be good candidate for total tongue reconstruction especially in thin patient.
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이형철 국립공주대학교 KNU 기업경영연구소 2024 기업경영리뷰 Vol.15 No.4
본 연구는 한국거래소(KRX) 유가증권시장 및 코스닥시장에 상장된 기업을 대상으로 연구개발비가 기업의 성과에 미치는 영향의 크기인 연구개발비 정보의 질이 주식 유동성에 미치는 영향을 살펴보기 위해 (1) 연구개발비 정보의 질의 크기가 다른 기업들 간에 주식 유동성의 크기가 차이가 있을지, (2) 연구개발비 정보의 질의 크기와 주식 유동성의 관계가 주식시장 정보 비대칭 수준에 따라 달라질 것인 지에 대해 검정한다. 실증분석은 2000년부터 2023년까지 기간 동안 상장 기업의 자료를 수집하여 수행한다. 각 개별 기업별로 추정한 연구개발비 정보의 질 변수의 차이가 상장 기업 주식 유동성에 미치는 영향이 어떠할 지 패널회귀분석을 이용하여 살펴본다. 실증분석을 시행한 결과, 가설 설정에서 예상한 것과 일치하는 결과를 얻었다. 즉 연구개발비 정보의 질 수준이 높은 경우에 주식 유동성도 크게 나타나는 모습을 확인할 수 있었다. 또 주식시장 정보 환경이 상대적으로 열악한 표본의 경우에 연구개발비 정보의 질과 주식 유동성의 양(+)의 관계가 더 강하게 나타나는 모습을 확인할 수 있었다. 본 연구는 기존 연구가 다양하게 다루어 오던 연구개발비 정보의 질에 관한 연구와 주식 유동성에 관한 연구를 바탕으로 양자의 관계가 어떠한 지를 살펴보고 있는 데에 의의가 있으며, 더 나아가 시장의 정보환경이 이 관계에 영향을 미치고 있음을 확인하고 있다는데에 그 의의가 있으며, 기여라고 할 수 있다. 앞으로 기업경영 실무는 물론 학술 연구에서도 다양한 시사점을 줄 수 있을 것으로 기대한다.
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이형철 국립공주대학교 KNU 기업경영연구소 2024 기업경영리뷰 Vol.15 No.1
This paper empirically investigates the effects of investors' sentiment and crash risk. In particular, this research investigates whether investors' sentiment is related to crash risks and whether the level of information asymmetry in the stock market affects the relation. Testable hypotheses were drawn. To investigate the hypotheses, stock prices and accounting information data of firms listed on Korea Exchange(KRX) were collected, and the hypotheses were examined by panel regressions. This research finds that investor sentiment has positive effects on the crash risks. Further, this study finds that the level of information asymmetry in the stock market increases the positive relationship between investors' sentiment and the crash risks. This work finds information asymmetry has a certain role in the relation between investors sentiment and crash risks. The findings suggest that an increase in information asymmetry may cause crash risks to be more effective.
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Rupture of endotracheal tube cuff during robot-assisted endoscopic thyroidectomy -A case report-
이형철,윤미자,구은경,박재현,전영태,이상철 대한마취통증의학회 2010 Korean Journal of Anesthesiology Vol.59 No.6
We encountered a case of a rupture of an endotracheal tube cuff during robot-assisted thyroid surgery in a 35-yearold male patient. Two hours after commencing surgery, the bellows of the ventilator were not filled and a rupture of the endotracheal tube cuff was suspected. Once the robot-manipulator is engaged, the position of the operating table cannot be altered without removing it from the patient. Reintubation with direct laryngoscopy was performed with difficulty in the narrow space between the patient’s head and robot-manipulator without moving the robot away from the patient. The rupture of the endotracheal tube cuff was confirmed by observing air bubbles exiting from the balloon in water. The patient was discharged 3 days after surgery without complications. In robot-assisted thyroid surgery, a preoperative arrangement of the robot away from the patient’s head to obtain easy access to the patient is essential for safe anesthetic care.
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