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군인 근골격계 부상 예방운동의 체계적 문헌고찰 및 메타 분석
성호용 ( Hoyong Sung ),김건희 ( Geon Hui Kim ),이온 ( On Lee ),김재우 ( Jaewoo Kim ),김경배 ( Kyoung Bae Kim ),문효열 ( Hyo Youl Moon ),김연수 ( Yeon Soo Kim ) 대한스포츠의학회 2024 대한스포츠의학회지 Vol.42 No.1
Purpose: This study aimed to conduct a systematic literature review and meta-analysis of the exercise intervention effects for the prevention of musculoskeletal injuries in military personnel. Methods: Among studies that included military personnel as participants, we identified randomized controlled trials (RCTs) and cluster-RCT studies that used exercise interventions as a method for injury prevention. Exercise encompassed all types of physical activity, and the effect size was determined by the ratio of injuries between groups. Literature searches were conducted with search terms modified to ensure common inclusion of keywords such as “Soldier,” “Injury prevention,” and “Exercise.” For the analysis of potential factors, variables selected for group differentiation included gender, risk of bias, exercise volume, injury location, exercise type, and study design. Results: Among a total of 8,598 search results, 10 papers were finally confirmed. The meta-analysis of all 10 papers showed that there was no statistically significant injury prevention effect, and significant heterogeneity was observed among the studies (incidence rate ratio, 0.82; 95% confidence interval, 0.62-1.09, I2=83%). Subgroup analysis revealed a significant 44% reduction in injuries in studies where exercise volume for injury prevention was relatively high. However, no significant injury prevention effects were observed in other potential factors between groups. Conclusion: The results of this study suggest that the effectiveness of injury prevention exercises in military settings was not statistically significant. However, through the analysis of potential factors, it was confirmed that increasing the time spent on injury prevention exercises may have a preventive effect on injuries.
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Geon Hui Kim,Hoyong Sung,Yeun Ryu,Jungjun Lim,Joon-Sik Kim,Hak Kyun Kim,Yeon Soo Kim 한국역학회 2021 Epidemiology and Health Vol.43 No.-
OBJECTIVES: The aim of this study was to identify the stepping cadence patterns in Korean adults by using objectively measured accelerometer data to analyze the time spent in each cadence category by sex and age. METHODS: During the 2014-2015 Korean National Health and Nutrition Examination Survey, 1,703 males and females aged 19-64 years provided at least 1 valid day of data (wearing an accelerometer ≥10 hr/d). The mean cumulative time and percentage per day in 8 cadence categories (0, 1-19, 20-29, 30-59, 60-79, 80-99, 100-119, and ≥120 steps/min) by sex and age group were calculated. RESULTS: Cumulative time and percentage per day decreased across the incremental cadence categories. Participants spent 360.08±2.56 min/d in the non-movement cadence category and 361.50±2.28 min/d in the incidental movement cadence category. However, they spent only about 18.1 min/d (2.1%) at ≥100 steps/min. Males spent significantly more time in the cadence categories of sporadic movement, purposeful steps, slow walking, and medium walking, but the other categories, except for brisk walking, had higher values in females (p<0.001). The older age group spent less time in non-movement cadence categories, and the youngest and oldest groups spent more time at a higher cadence (≥100 steps/min) than the other age groups. Similar patterns were found in a subgroup analysis by sex. CONCLUSIONS: Korean adults spent most of their time at a low cadence and only a few minutes at a high cadence (≥100 steps/min); this trend was consistent across sex and age groups.
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회전저항 감소를 고려한 비공기입 타이어 형상 최적설계에 관한 연구
김진명(JinMyeong Kim),김재식(Jaesik Kim),김영빈(Youngbin Kim),전지훈(Jihoon Jeon),김경필(Kyeongpil Kim),황순욱(Soonwook Hwang),이호용(Hoyong Lee),서명원(Myungwon Suh) 한국자동차공학회 2022 한국 자동차공학회논문집 Vol.30 No.4
Non-pneumatic tires(NPTs) can be manufactured with a viscoelastic material characterized by low energy loss due to the relatively high freedom of selection of materials using a simple manufacturing method. For this reason, NPTs have low rolling resistance compared with pneumatic tires in the material aspects. NPTs, which consist of flexible spokes, are still at an early stage of research and development, and it is necessary to study NPTs to improve the rolling resistance structurally. In this paper, the optimization of spokes with honeycomb cellular structures is performed to minimize rolling resistance by using the design of experiment(DOE) and finite element method. The DOE is conducted with a steady state rolling(SSR) analysis to determine the effects of four design variables on the rolling resistance: the cellular thickness(t1, t2, t3) and the radius of curvature of cellular(R). Optimum design variables are determined from the analysis of means(ANOM). Sensitivity information of design variables is evaluated via the analysis of variance(ANOVA).
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Effect of transmittance on luminescence properties of phosphor-in-glass for LED packaging.
Kim, Yurian,Kim, Sunil,Iqbal, Fauzia,Yie, Hoyong,Kim, Hyungsun Optical Society of America 2015 Optics express Vol.23 No.3
<P>The transmittance of phosphor-in-glass (PIG) color converter material was studied as a factor affecting the luminescence properties of light emitting diode packaging; it is closely related to the residual pores of sintered glass. In this study, the correlation between porosity and optical properties of the glass and PIG plates was investigated. The transmittance, luminescence properties, and porosity were measured by UV-visible spectrometer, integrating sphere and scanning electron microscope, respectively. Transmittance of the sintered glass plate and the luminous efficacy of the PIG plate both increase with decreased porosity, while the light scattering coefficient decreases. Luminescence properties such as emission intensity and color coordinates are also influenced by transmittance of the PIG plate.</P>
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Kim, Sungbum,Lee, Sangjae,Jeong, Seongkyeong,Lim, Myunghee,Song, Youngil,Ahn, Euisan,Jeong, Hoyong,Kim, Najin,Lee, Hyunjoo,Choi, Sungwoon 한국재난정보학회 2017 한국재난정보학회 논문집 Vol.13 No.1
지난 3년('13~'15)간 화학물질사고는 301건이 발생하였으며, 연평균 약 100건이 집계됐다. 이와 같은 화학사고는 인명과 환경에 많은 피해를 가져왔다. '13년~'15년에 발생한 운반차량 화학사고는 연평균 21건으로 전체 화학사고의 약 21%를 차지한다. 화학물질 운반차량의 사고는 지역에 관계없이 도로상에서 발생하고 있기 때문에, 관계기관의 대응 및 사후처리 등 체계적인 현장조사가 필요하다. 또한 화학물질 운반업자 및 화물주 등의 협조가 절대적으로 필요한 상황이다. 따라서, 본 논문에서는 화학물질 운반차량의 사고발생에 대한 현장조사 및 처리 절차를 조사 분석하였다. 이를 통해 운반차량의 화학사고에 대한 원인을 분석하고 현장조사와 처리절차를 체계적으로 마련하는 기초자료가 될 것으로 판단된다. 301 cases of chemical accidents occurred during the recent three years('13~15) recording about 100cases on average in Korea.. Chemical accidents has brought casualties and negative impact on the environment. The chemical accident by transporting vehicles during recent 3 years records 21 on average & takes about 21% of the whole chemical accident. Systematic investigation on chemical accident was needed by corresponding authorities since the transport accident has occurred on the road, all over the nation. For the systematic investigation on the accident scene by the corresponding authorities, the cooperation of transport companies and transport contractor is highly necessary. The investigation of such accident scene was examined and analyzed in this study. Through this study, the results can be basis to analyzed the cause of chemical accident by transporting vehicles and to prepare procedures for on-site investigation and handling systematically.
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