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Won Il Choi(최원일),Day Sung Kim,Jung Hoon Kim,Dong Shik Choi,Yil Woo Kim,Jeung-Ho Kim,Seong-Kyu Kang 대한인간공학회 2007 대한인간공학회 학술대회논문집 Vol.- No.-
The work-related musculoskeletal disorders (WMSDs) have increased at the atypical work of the food & accommodation industry as well as at the regular work such as the manufacturing industry. However, most studies related to WMSDs have focused on the manufacturing industry. This paper investigates WMSDs, their prevention activities and problems in the food & accommodation industry. This study was performed for 160 restaurants/cafeterias or hotels in Gyeongsang province through interviews, document analysis, video analysis, etc., which included jobs of bellman, front-desk, room-maids and cook, etc. Based on the results, administrative or engineering measures for preventing WMSDs were suggested.
이일화(Il-Wha Lee),장승엽(Seung-Yup Jang),엄주환(Ju-Hwan Um),최원일(Won-Il Choi),우용근(Yong-Keun Woo) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.10
토공구간에서 콘크리트궤도를 적용할 경우, 가장 중요한 사항은 노반의 침하를 적정수준으로 억제하는 것이다. 노반침하를 기준값 이내로 유지함으로써 차량 및 궤도의 주행안정성을 확보하고 유지보수 노력을 감소시켜야 한다. 콘크리트궤도는 기존 자갈도상궤도와 달리 침하가 발생하였을 경우, 궤도의 사용성 저하가 크고 대처 방안이 매우 제한적이기 때문에 장기적으로 침하를 엄격히 제한하여야 한다. 또한 유지보수단계에서 원활한 관리수준으로 억제하려면 이에 대한 합리적인 대책을 마련하는 것이 필요하다. 본 논문에서 이러한 침하와 관련된 문제점을 사전에 차단하고 효율적인 노반관리를 위한 유지보수방안을 제시하고자 하였다. An active application of concrete track is being expected for the future construction of Korean railroad. For the successful concrete track construction and operation in earthwork areas, the residual settlement should be reasonably maintained using the proper method. The maintenance is very difficult for excessive settlement on existing line, it is need to constrain the residual settlement reasonably. In this present paper, the maintenance system is suggested to reduce the settlement problem and to increase the maintenance efficiency in stage of the operation.
만성 폐쇄성 폐질환(COPD) 환자에서 운동 시 발생하는 산소 불포화 반응과 관련된 인자
심상우 ( Sang Woo Shim ),조준연 ( Jun Yeon Jo ),권용식 ( Yong Sik Kwon ),채진녕 ( Jin Nyeong Chae ),박지혜 ( Jie Hae Park ),이미영 ( Mi Young Lee ),노병학 ( Byung Hak Rho ),최원일 ( Won Il Choi ) 대한결핵 및 호흡기학회 2011 Tuberculosis and Respiratory Diseases Vol.70 No.6
Background: The causes of exertional desaturation in patients with COPD can be multifactorial. We aimed to investigate factors predict exertional desaturation in patients with moderate to severe COPD. Methods: We tested 51 consecutive patients with stable COPD (FEV1/FVC, 40±13% predicted). Patients performed a six minute walk test (6MWT). Pulse oxymetric saturation (SpO2) and pulse rate were recorded. Results: Oxygen desaturation was found in 15 subjects after 6MWT, while 36 subjects were not desaturated. Lung diffusing capacity was significantly lower in desaturation (DS) group (62±18% predicted) compared with not desaturated (ND) group (84±20, p<0.01). However there was no statistical difference of FEV1/FVC ratio or residual volume between two groups. The pulse rate change was significantly higher in the desaturated compared with the not desaturated group. Six minute walking distance, subjective dyspnea scale, airflow obstruction, and residual volume did not predict exertional oxygen desaturation. Independent factors assessed by multiple logistic regression revealed that a pulse rate increment (odd ratio [OR], 1.19; 95% confidence interval [CI], 1.01~1.40; p=0.02), a decrease in baseline PaO2 (OR, 1.105; 95% CI, 1.003~1.218; p=0.04) and a decrease in lung diffusing capacity (OR, 1.10; 95% CI, 1.01~1.19; p=0.01) were significantly associated with oxygen desaturation. Receiver operator characteristic (ROC) analysis showed that an absolute increment in pulse rate of 16/min gave optimal discrimination between desaturated and not desaturated patients after 6MWT. Conclusion: Pulse rate increment and diffusion capacity can predict exertional oxygen desaturation in stable COPD patients with moderate to severe airflow obstruction.