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윤태홍,이철호,박기성,배지훈,조준우,장재석 대한흉부외과학회 2019 Journal of Chest Surgery (J Chest Surg) Vol.52 No.4
Background: Accurate mediastinal lymph node staging is vital for the optimal therapy and prognostication of patients with lung cancer. This study aimed to determine the preoperative risk factors for pN2 disease, as well as its incidence and long-term outcomes, in patients with clinical N0–1 non-small cell lung cancer. Methods: We retrospectively analyzed patients who were treated surgically for primary non-small cell lung cancer from November 2005 to December 2014. Patients staged as clinical N0–1 via chest computed tomography (CT) and positron emission tomography (PET)-CT were divided into two groups (pN0–1 and pN2) and compared. Results: In a univariate analysis, the significant preoperative risk factors for pN2 included a large tumor size (p=0.083), high maximum standard uptake value on PET (p<0.001), and central location of the tumor (p<0.001). In a multivariate analysis, central location of the tumor (p<0.001) remained a significant preoperative risk factor for pN2 status. The 5-year overall survival rates were 75% and 22.9% in the pN0–1 and pN2 groups, respectively, and 50% and 78.2% in the patients with centrally located and peripherally located tumors, respectively. In a Cox proportional hazard model, central location of the tumor increased the risk of death by 3.4-fold (p<0.001). Conclusion: More invasive procedures should be considered when preoperative risk factors are identified in order to improve the efficacy of diagnostic and therapeutic plans and, consequently, the patient’s prognosis.
윤태홍,변재현 대한산업공학회 2008 산업공학 Vol.21 No.4
Small sized companies have not been successful in systematically applying statistical process control because of insufficient human resources. In this paper we present a case study of automatic checking system for a small sized company which produces various types of gears. A systematic way of automatically measuring gears is proposed and statistical analysis methods are presented. To reduce variation in the measurement data, a standard operating procedure is also proposed. This case study can be helpful to quality assurance practitioners of small sized companies who are willing to develop checking or inspection systems for their products.
체계적인 문제해결을 위한 QC도구의 활용 방안에 관한 연구
윤태홍(Tae-Hong Yun),김창열(Chang-Yeol Kim),변재현(Jai-Hyun Byun) 한국경영과학회 2008 한국경영과학회 학술대회논문집 Vol.2008 No.5
There are many quality control(QC) tools useful for solving quality problems. In this paper, we suggest problem-solving procedures to systematically deal with various quality problems. These procedures will help quality practitioners to solve field quality problems.
체계적인 문제해결을 위한 QC도구의 활용 방안에 관한 연구
윤태홍(Tae-Hong Yun),김창열(Chang-Yeol Kim),변재현(Jai-Hyun Byun) 대한산업공학회 2008 대한산업공학회 춘계학술대회논문집 Vol.2008 No.5
There are many quality control(QC) tools useful for solving quality problems. In this paper, we suggest problem-solving procedures to systematically deal with various quality problems. These procedures will help quality practitioners to solve field quality problems.
윤태홍 ( Tae Hong Yun ),변재현 ( Jai Hyun Byun ) 한국품질경영학회 2012 품질경영학회지 Vol.40 No.4
Purpose: In this paper we propose modified Notz designs which are useful to experimenters who want to adopt the sequential experimentation strategy and to estimate second-order regression model with as few experimental points as possible. Methods: We first present the design matrices and design points in two or three dimensional spaces for such small sized second-order designs as small composite hybrid and Notz designs. Modified Notz designs are proposed and compared with some response surface designs in terms of the total number of experimental points the estimation capability criteria such as D- and A-optimality. Results: When sequential experimentation is necessary the modified Notz designs are recommendable. Conclusion: The result of this paper will be beneficial to experimenters who need to do experiments more efficiently especially for those who want to reduce the time of experimentation as much as possible to develop cutting-edge products.