교통흐름을 고려한 교통약자 우선신호 운영 방안 연구 : 연동화 가로구간내 횡단보도를 대상으로

유준일,김원철,이선하 한국ITS학회 2013 한국ITS학회 학술대회 Vol.2013 No.1

신호프로그램 선택에 의한 교통축 제어에 따른 효과 분석

유준일,정현지,이선하 한국ITS학회 2012 한국ITS학회 학술대회 Vol.2012 No.1

이태원 참사로 인한 관광목적지 이미지 파괴효과 연구 : 이중차분법의 적용

유준일,이예린,김민혁,구철모 한국경영정보학회 2023 한국경영정보학회 학술대회논문집 Vol.2023 No.06

Evaluating Postoperative Muscle Strength Using Surface Electromyography in Hip Fracture Patient

유준일,변하영,Hyeong Seop Kim,Yun Jeong Jang,Chang Han Lee 대한골대사학회 2020 대한골대사학회지 Vol.27 No.2

Background: To compare the muscle strength of patients with a hip fracture according to the presence of sarcopenia after surgery and the correlation of measured values between a Biodex and surface electromyography (sEMG) in postoperative measurement of muscle strength. Methods: Seventy-one patients who underwent hip fracture surgery were included in this study. Muscle mass was measured using dual energy X-ray absorptiometry and the grip strength was evaluated using a dynamometer. The diagnosis of sarcopenia followed the Asian Working Group for Sarcopenia criteria. We evaluated the Biodex to assess muscle strength according to the presence of sarcopenia and at the same time measured the sEMG to evaluate the correlation of muscle strength between Biodex and sEMG. Results: We assigned 34 patients with sarcopenia and 37 without sarcopenia to 2 groups. In the comparison of muscle strength using Biodex and sEMG between the 2 groups, it was confirmed that muscle strength of sarcopenia group was decreased compared with that of the non-sarcopenia group, although there was no statistical significance between the groups. However, Biodex and sEMG showed very close correlation with muscle strength in all variables. Conclusions: We suggest that using sEMG for the evaluation of muscle strength after hip fracture surgery may be an excellent tool alternative to isokinetic testing machines such as the Biodex.

Incidence and Mortality of Osteoporotic Refractures in Korea according to Nationwide Claims Data

유준일,하용찬,박기수,김록범,서성효,구경회 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.10

Purpose: Studies on the incidence and mortality of refractures after primary osteoporotic fracture are limited by the relatively rareincidence of such refractures and small sample sizes. The objectives of this research were: 1) to determine the incidence of osteoporoticrefractures and fracture locations and 2) to assess mortality rates associated with osteoporotic refracture over a medianfollow up of 3 years using nationwide claim database. Materials and Methods: Patients over 50 years of age who had an osteoporotic fracture that was confirmed operationally wereenrolled. Refracture was defined as that after 6 months of an untreated period. Mortality rate was calculated using the Charlsoncomorbidity index and was analyzed using Cox proportional hazards regression analysis. Results: A total of 18956 first-time instances of osteoporotic fracture were reported between 2007 and 2012 after a median followup of 3.1 years (range, 1 to 7 years). Among 18956 patients, 2941 (15.50%) experienced refracture. After follow up for 1 year, cumulativemortality rates for re-fracture and non-refracture groups were 9.1% and 7.2%, respectively. After adjusting for covriates,mortality rate was 1.2 times greater in patients with re-fracture than in patients without re-fracture over a median follow up of 3years (hazard ratio: 1.20, 95% confidence interval: 1.08–1.34, p<0.001). Conclusion: The incidence of osteoporotic re-fracture in this nationwide study was 15.5%, and the mortality rate of re-fracturepatients was 1.2 times higher than that of non-refracture patients over a median follow up of 3 years.

Nutrition and Exercise Treatment of Sarcopenia in Hip Fracture Patients: Systematic Review

유준일,Yong-Chan Ha,차용한 대한골대사학회 2022 대한골대사학회지 Vol.29 No.2

Background: This study aimed to investigate nutritional or rehabilitation intervention protocols for hip fracture patients with sarcopenia and to analyze the effect of these protocols through a systematic review of studies that reported clinical results. Methods: Studies were selected based on the following criteria: (1) study design: randomized controlled trials or non-randomized comparative studies; (2) study population: patients with hip fracture; (3) intervention: nutritional or rehabilitation; and (4) reporting the clinical outcomes and definition of sarcopenia. Results: Of the 247 references initially identified from the selected databases, 5 randomized controlled studies and 2 comparative studies were selected for further investigation. The total number of patients was 497. We found 2 specific rehabilitation interventions, one medication intervention using erythropoietin, and 4 nutritional interventions using amino-acid or protein. Among the studies included in this systematic review, 2 studies did not find a clear statistical difference in assessment tools compared to controls after intervention. On the other hand, the rest of the studies positively interpreted the results for intervention. The most frequently used assessment tool for intervention was handgrip strength. Conclusions: Although mainstream methods of intervention for sarcopenia include nutritional, exercise, and drug interventions, the validity of these interventions in elderly hip fractures has not been clearly proven. In addition, as most studies only reported short-term results, there is no consensus on the optimal long-term treatment.

Age-related Reference Intervals for Total Collagen-I-N-terminal Propeptide in Healthy Korean Population

유준일,박애자,임용관,권오주,최재희,도재혁,김선주,김영기,하용찬 대한골대사학회 2018 대한골대사학회지 Vol.25 No.4

Background: Procollagen type I N-terminal propeptide (PINP) is one of the most clinically useful bone formation biomarkers. Therefore, the purpose of this study was to independently evaluate the performance of automated total PINP assay and established age- and gender- specific reference intervals for PINP in healthy Korean population. Methods: The imprecision, linearity, and detection capability of Elecsys total PINP assay was determined and reference interval was established using 599 serums from Korean population with normal bone mineral densities based on bone densitometry. Age groups were divided into 20s, 30s, 40s, 50s, 60s and over. Results: Elecsys total PINP had excellent performance in imprecision, linearity, and detection capability. When partitioning age groups in Korean male and female populations, there was significant difference in total PINP between different age groups. In male populations, PINP level was decreased with increasing age, then it remained steady after middle-age. In female populations, there was a decreasing tendency similar to that in the male population with a sharp increase in the 50 to 59 age group. Conclusions: Elecsys total PINP assay showed precise and reliable performance in our study. We established age-related PINP reference intervals for Korean male and female population with normal bone mineral densities.

Comparison between Cementless and Cemented Bipolar Hemiarthroplasty for Treatment of Unstable Intertrochanteric Fractures: Systematic Review and Meta-analysis

유준일,차용한,김갑중,김하용,최원식,황선철 대한고관절학회 2018 Hip and Pelvis Vol.30 No.4

Purpose: This study was conducted to compare cemented and cementless bipolar hemiarthroplasty in elderly patients with unstable intertrochanteric fractures via meta-analysis and systematic review of relevant studies. Materials and Methods: Systematic review and meta-analysis were performed on 31 available clinical studies; 19 of these studies used cemented stems, 12 used cementless stems, one used both types of stems, and two studies involved a comparative analysis of both stem types. Results: There were statistically significant differences in rates of leg length discrepancy (LLD) greater than 1cm between the cemented (event rate, 0.089) and cementless groups (event rate, 0.015 and 0.047; P=0.03). Conclusion: Cemented bipolar hemiarthroplasty and cementless bipolar hemiarthroplasty performed on elderly patients with unstable intertrochanteric fracture revealed similar mortality and complication rates; however, the rate of LLD greater than 1 cm was significantly higher in the cemented group compared with the cementless group.

코로나19 상황에서 텍스트마이닝 기법을 통한 레스토랑 선택 속성 분석: 을지로 지역을 중심으로

유준일,이은지,구철모 한국경영정보학회 2022 한국경영정보학회 학술대회논문집 Vol.2022 No.11

2020년 3월, 코로나바이러스 팬데믹으로 선포되면서, 다양한 방역 조치가 취해져 왔다. 이에 따라, 관광 및 환대 산업 내의 많은 변화들이 야기되었다. 특히, 레스토랑 산업은 코로나19의 정책적 지침에 따라, 운영적 측면에서 많은 변화가 나타났다. 레스토랑 선택 속성과 관련 기존 선행 연구는 기존 분위기, 서비스, 음식 품질과 같은 요소들을 주로 다뤄왔으나, 코로나19 이후 연구에서 발견된 위생(hygiene), 청결(cleanliness) 요인의 중요성을 강조한 연구는 미비하다. 이에 따라, 본 연구에서는 코로나19 이후 연구에서 발견된 위생, 청결 요인이 국내 온라인 리뷰 상에서 해당 요인이 선택 속성으로 발견되는지 탐색적인 접근을 시도하고자 하였다. 본 연구의 대상은 서울 을지로 지역 내 406개의 레스토랑을 대상으로 수집한 31,115개의 온라인 리뷰이며, 텍스트마이닝 기법을 통해 분석을 시도하였다. 분석 결과, 코로나19 이후 레스토랑의 새로운 선택 속성으로 코로나19와 관련된 토픽을 새롭게 발견하였다. 연구 결과에 기반하여, 레스토랑 운영 방안에 대한 실무적 제언을 시도하였다.

High Prevalence of Sarcopenia in Korean Patients after Hip Fracture: A Case-Control Study

유준일,하용찬,권혁빈,이영균,구경회,유문집 대한의학회 2016 Journal of Korean medical science Vol.31 No.9

Sarcopenia-related falls and fractures are increasing worldwide due to the aging population. The purpose of this study was to 1) evaluate anthropometric characteristics related to hip fracture in Korean patients, 2) investigate sarcopenia prevalence in hip fracture (HF) and non-hip fracture (NF) groups, and 3) investigate the correlation between sarcopenia and osteoporosis. This case-control study examined 359 HF and 1,614 NF normal populations using Korea National Health and Nutrition Examination Survey data. We performed whole-body dual energy X-ray absorptiometry to analyze body composition using the skeletal muscle mass index (SMI: lean mass/height2) and bone mineral density (BMD). In the HF group, using the AWGS definition, the prevalence of sarcopenia in women and men was 44.3% and 68.2%, respectively; in the NF group, it was 7.1% and 16.1%, respectively. Lower appendicular SMI (P < 0.001), leg muscle mass (P < 0.001), and higher prevalence of sarcopenia (P < 0.001) were observed in the HF group after adjustment for age and gender. In multivariate analysis, sarcopenia (OR = 6.52; 95% CI = 4.67-9.09), age (OR = 1.15; 95% CI = 1.13-1.17), and osteoporosis (OR = 1.87; 95% CI = 1.35-2.58) were associated with the occurrence of a hip fracture. This study showed a higher prevalence of sarcopenia in patients with hip fractures compared with a normal population, and higher prevalence of sarcopenia in men.