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황정택,김종학,전주연,한재현,Hwang, Jeong Taek,Kim, Jong Hak,Jeon, Ju Yeon,Han, Jae Hyeon 한국안전학회 2017 한국안전학회지 Vol.32 No.5
This paper is to introduce the main modeling assumptions and data structures associated with right-censored data to describe the successful methodological ideas for analyzing such a field-failure-data when components operating in different environments. The Kaplan - Meier method is the most popular method used for survival analysis. Together with the log-rank test, it may provide us with an opportunity to estimate survival probabilities and to compare survival between groups. An important advantage of the Kaplan - Meier curve is that the method can take into account some types of censored data, particularly right-censoring. The above non-parametric method was used to verify the equality of parts life used in different environments. After that, we performed the life distribution analysis using the parametric method. We simulated data from three distributions: exponential, normal, and Weibull. This allowed us to compare the results of the estimates to the known true values and to quantify the reliability indices. Here we used the Akaike information criterion to find a suitable life time distribution. If the Akaike information criterion is the smallest, the best model of failure data is presented. In this paper, no-nparametrics and parametrics methods are analyzed using R program which is a popular statistical program.
퍼지추론을 이용한 위험도 관리 기반의 차륜삭정 순위 선정 연구
황정택,김종학,전주연 한국철도학회 2019 한국철도학회논문집 Vol.22 No.6
When the wear or deformation of EMU wheels reaches certain dimensional limits, either the treads have tobe reprofiled to the correct shape or the wheels have to be replaced. If we miss the correct cutting time, the wheels willundergo sudden deformation. This can lead to rapid deformation of high-risk wheels, resulting in availability and costproblems. Taking into account the difficulty of wheel wear (include deformation) prediction and the priority-mechanismof wheel-turning, it is reasonable to determine the wheel-turning order as a risk-based rule. However, it is not appropriateto apply the risk management method applied in other technology fields to the priority mechanism of EMU wheels. As a result, we have developed a fuzzy-risk model that can be practically applied, and have also been able to derive efficientresults through experiments.
Usefulness of Arthroscopic Treatment of Painful Hip after Acetabular Fracture or Hip Dislocation
황정택,이우용,강찬,황득수,김동열,Long Zheng 대한정형외과학회 2015 Clinics in Orthopedic Surgery Vol.7 No.4
Background: Painful hip following hip dislocation or acetabular fracture can be an important signal for early degeneration and progression to osteoarthritis due to intraarticular pathology. However, there is limited literature discussing the use of arthroscopy for the treatment of painful hip. The purpose of this retrospective study was to analyze the effectiveness and benefit of arthroscopic treatment for patients with a painful hip after major trauma. Methods: From July 2003 to February 2013, we reviewed 13 patients who underwent arthroscopic treatment after acetabular fracture or hip dislocation and were followed up for a minimum of 2 postoperative years. The degree of osteoarthritis based on the Tonnis classification pre- and postoperatively at final follow-up was determined. Clinical outcomes were evaluated using visual analogue scale for pain (VAS) and modified Harris hip score (MHHS), and range of motion (ROM) of the hip pre- and postoperatively at final follow-up. Results: There were nine male and four female patients with a mean age at surgery of 28 years (range, 20 to 50 years). The mean follow-up period of the patients was 59.8 months (range, 24 to 115 months), and the mean interval between initial trauma and arthroscopic treatment was 40.8 months (range, 1 to 144 months). At the final follow-up, VAS and MHHS improved significantly from 6.3 and 53.4 to 3.0 and 88.3, respectively (p = 0.002 and p < 0.001, respectively). However, there were no significant differences in hip flexion, abduction, adduction, external rotation, and internal rotation as minor improvements from 113.1°, 38.5°, 28.5°, 36.5°, and 22.7° to 118.5°, 39.0°, 29.2°, 38.9°, and 26.5° were observed, respectively (p = 0.070, p = 0.414, p = 0.317, p = 0.084, and p = 0.136, respectively). None of the patients exhibited progression of osteoarthritis of the hip at the final follow-up. Conclusions: Arthroscopic treatment after acetabular fracture or hip dislocation is effective and delays the progression of traumatic osteoarthritis.
황정택,고덕환,박진영,Hwang, Jung-Taek,Kho, Duk-Hwan,Park, Jin-Young 대한관절경학회 2012 대한관절경학회지 Vol.16 No.1
회전근 개 파열의 봉합술은 최근 들어 괄목할만한 발전을 보여주고 있다. 회전근 개 파열의 자연사를 관찰하면 대부분의 경우에서 시간이 지남에 따라 크기가 증가하는 양상이 관찰되었다. 회전근 개 파열의 후기에 오는 지방 침윤 및 광범위 회전근 개 파열 후 발생하는 회전근 개 파열 관절증은 회전근 개 파열의 봉합술에서 예후를 예측하거나 수술 시기를 결정하는데 중요한 요소라 할 수 있다. 회전근 개 파열시 증상 발생 후 3년 뒤에 중등도의 지방 침윤이 발생하는 것으로 관찰되어 그 이전에 회전근 개 파열의 봉합술을 시행하는 것이 추천되고 있으며, 또한 회전근 개 파열 관절증에서도 견봉상완골 간격이 감소하기 전에 봉합술을 하는 것이 권장되고 있다. 회전근 개 파열의 관절경하 봉합술은 크게 일열 봉합술 및 이열 봉합술로 나눌 수 있으며, 시간과 비용 면에서는 전자가 장점이 있으나, 생역학적이 관점에서는 후자가 더 우수하다. 이열 봉합술의 생역학적인 장점을 유지하면서 보다 적은 시간에 회전근 개의 봉합을 가능하게 한 교량형 봉합술이 개발되어 최근 널리 사용되고 있으며, 교량형 봉합술 내에서도 파열의 특성에 따라 몇 가지 다른 술식이 개발되어 사용되고 있다. The repair technique of rotator cuff tear has been markedly developed in recent years. When the natural history of rotator cuff tear was followed, the size of rotator cuff tear increased with time. The fatty infiltration which would come at the later period of rotator cuff tear and the rotator cuff tear arthropathy which would be occurred after massive rotator cuff tear may be the important factors in predicting the prognosis of rotator cuff tear or determining the timing of surgery. Because moderate supraspinatus fatty infiltration appeared an average of 3 years after onset of symptoms, the repair of rotator cuff tear was recommended to be performed before that. And if there was massive rotator cuff tear with cuff tear arthropathy, it was recommended that the rotator cuff repair should be performed before the occurrence of the narrowing of acromiohumeral interval. The techniques of arthroscopic rotator cuff repair were mainly the single row repair and the double row repair. The former is good in view of time consuming and cost, but the latter is superior in view of biomechanics. To maintain the benefit in biomechanics of double row technique and reduce the time of surgery, the suture-bridge technique was invented and widely used recently. There are several modified techniques in arthroscopic suture-bridge technique according to the characteristics of rotator cuff tear.
황정택(Jeong Taek Hwang),목진용(Jin Yong Mok),이승일(Seung Il Lee),이희성(Hi Sung Lee) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Derailment is likely to have a direct connection with human life and must be eliminated. A traveling safety evaluation method based mainly on derailment coefficient has already established. But this method is very difficult because Derailment is caused by multiple factors. To evaluate the derailment factor of running train that runs on the curved track, we make use of mechanism that wheel loads and lateral forces were affected by track and rolling stock parameter. In this paper, deal with a search on the parameter and derailment factor. According to results of computer simulation value of Q/P, running safety is connected with operation velocity, curve radius, cant, track irregularity, suspension stiffness and static wheel load ratio, etc.
만성 요촌 환자에 있어서 척추주위 근육의 위축에 대한 관찰
황종헌,김영백,권정택,민병국,황성남,최덕영,석종식 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.4
The purpose of this study is to investigate whether paraspinal muscle wasting occurs in association with chronic low back pain(LBP) and to know whether low back muscle exercise is effective for abating chronic low back pain Cross sectional areas(CSA) of lumbar vertebral bodies and paraspinal muscles were measured using CT at the level of the fouth lumbar vertebral body in 37 patients(23 males. 14 females) with acute low back pain and in 44 patients(2O males, 24 females) with chronic low back pain. The results were as follows; 1) The mean age of the patients with chronic LBP were higher than those with acute LBP 2) The CSAs of L4 vertebral bodies were correlated significantly with body weight and the CSAs of L4 vertebral bedies. erector spinae and psoas muscles were larger in males than in females. 3) The volumes of the paraspinal muscles were significantly reduced in patients with chronic LBP compared to acute LBP. These changes can cause erector spinae and psoas muscle weakness and disuse atrophy and thereby predispose to spinal instability and progressive dysfunction.