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A parametric study based on spectral fatigue analysis for 170k LNGC
박태윤,장창두,서용석,김봉재 대한조선학회 2011 International Journal of Naval Architecture and Oc Vol.3 No.2
The Spectral Fatigue Analysis is representative fatigue life assessment method for vessels. This Analysis is performed generally for the whole vessel and many assessment sites. The spectral fatigue analysis is performed through the process of hydrodynamic response analysis, global structural analysis, local structural analysis and calculation of fatigue damage. In these processes, fatigue damage is affected by many variables. The representative variables are S-N curve data,wave scatter data, wave spectrum, bandwidth effect and etc. In this paper, the effects of these variables to the fatigue damage are analyzed through the spectral fatigue analysis for 170k LNGC.
일반화된 필터 뱅크를 적용한 OFDM 시스템에서의 다중 경로 폐이딩 채널 등화기 성능 분석
박태윤,최재호 한국통신학회 2001 韓國通信學會論文誌 Vol.26 No.11
본 논문에서는 주파수 선택적 다중 경로 페이딩 채널에서 필터 뱅크 기반의 직교 주파수 분할 다중 데이터 전송 시스템을 위한 새로운 DFE 등화 기법을 제안하였다. 기존의 OFDM 시스템과 비교하여 제안된 시스템의 복잡도가 증가하지만 비트 오류율에 있어서 나은 성능을 얻을 수 있었다. 시뮬레이션 결과 특히 낮은 SNR 태널 환경에서 제안한 기법이 우수한 성능을 보였다. A novel decision-feedback equalization technique for a generalized filter bank based orthogonal frequency division multiplexing data transmission system operating in a frequency selective multipath fading channel is presented in this paper. At the cost of relatively increased computational complexity in comparison to the conventional OFDM systems, the proposed system achieves a better performance in trims 7f bit error rates. The simulation results confirm of superiority and robustness of our method, particularly, in the low SNR channel environments.
박태윤,정재우,장주영,최재철,신종욱,박인원,최병휘,김재열 대한결핵및호흡기학회 2018 Tuberculosis and Respiratory Diseases Vol.81 No.2
Background: Eosinophilia is well recognized in specific conditions. The objective of the present study was to determine clinico-radiologic characteristics of eosinophilia and changes in prevalence over 10 years in recipients of private health screening program at a tertiary hospital in Korea. Methods: Data of private health screening program recipients at the health promotion center of Chung-Ang University Hospital from 2004 to 2013 were collected. Health-related questionnaires and laboratory findings of private health screening program with possible relation with eosinophilia were reviewed. Results of enzyme-linked immunosorbent assay (ELISA) for parasite, chest computed tomography, and pulmonary function test were also reviewed. Results: The cumulative prevalence of eosinophilia was 4.0% (1,963 of 48,928). Prevalence of eosinophilia showed a decreased trend from 2004 to 2013. Most cases (96.6%) had mild degree of eosinophilia. Eosinophilic subjects were older and male-predominant. They showed lower levels of forced expiratory volume in 1 second (FEV1%), forced vital capacity (FVC%), and FEV1/FVC than those without eosinophilia. Eosinophilic subjects showed higher positive rate for common parasite in ELISA than those without eosinophilia. On radiologic findings, consolidation and ground glass opacities were positively associated with the degree of eosinophilia. When eosinophil was classified based on severity, statistically significant correlation between the severity of eosinophil and radiologic abnormalities was found. Conclusion: Eosinophilia is uncommon in healthy population. It usually occurs at a mild degree. Eosinophilic patients have more radiologic abnormalities compared to those without eosinophilia. Such radiologic abnormalities are associated with the severity of eosinophilia.
Prediction of Anthracofibrosis Based on Clinico-Radiographic Findings
박태윤,김덕겸,허은영,정희순,진광남 연세대학교의과대학 2017 Yonsei medical journal Vol.58 No.2
Purpose: Because anthracofibrosis (AF) is associated with tuberculosis (TB), detection of AF is clinically relevant in Korea, a TB endemic region. We thus sought to develop and validate a predictive model for AF using clinical radiographic data. Materials and Methods: Between January 1, 2008 and March 31, 2014, 3849 adult patients who underwent bronchoscopies were retrospectively included from an observational registry. We dichotomized patients based on the presence (n=167) or absence (n=242) of AF. After analyzing their clinico-radiographic characteristics, a logistic prediction model was developed. An area under the curve (AUC) was drawn using the weighted score in logistic regression model. To evaluate the degree of overfitting of the predictivemodel, a 5-fold cross-validation procedure was performed. Results: In multivariate logistic regression, clinical findings such as age >70 years, female gender, active TB, and computed tomographyfindings including atelectasis, stenosis, bronchial wall thickening, enlarged and calcified lymph nodes were significant diagnostic predictors for AF. The weighed score had an AUC of 0.939 [95% confidence interval (CI)=0.911–0.960], similar to the AUC obtained from internal validation (AUC=0.926, 95% CI=0.896–0.949). Conclusion: The prediction model may be helpful for predicting AF based only on clinical and radiographic findings. However, further external validation is necessary.
변형률 속도를 고려한 저온 고속 인장 실험에 관한 연구
박태윤,전상배,전민성,송하철,김광옥,김성찬 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
In this study, high-speed tensile tests in cryogenic environment for SUS304L and AI5083 are performed considering strain rate effect. In order to assess effect of cryogenic environment, high-speed tensile tests in room temperature are also performed for same materials and conditions. From the results, generally fracture strains of SUS304L are larger than those of AI5083 in all conditions. For the SUS304L, fracture strains in the room temperature are larger than those in cryogenic environment. Otherwise, for AI5083, fracture strains in cryogenic environment are larger than those in room temperature. The effect of strain rate is also assessed for each temperatures and materials.