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Study on Thermal Properties of Epoxy-Adhesive Film for Aluminum Sandwich Composite Structure
오경원,박현범 한국항공우주학회 2021 International Journal of Aeronautical and Space Sc Vol.22 No.1
Among many composite material structures, honeycomb sandwich composites have been used in various ways. The honeycomb sandwich is adhered by polymer resin adhesive and the stiffness of honeycomb sandwich structures is determined by adhesive characteristics. This study is intended to evaluate adhesive characteristics after surface treatment and lateral compressive characteristics before and after thermal treatment when using adhesive films between aluminum skin (5J32) and honeycomb of aluminum honeycomb panel.
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한국 소아청소년의 비만 유병률 추이: 1997년과 2005년 비교
오경원,장명진,이나연,문진수,이종국,유명환,김영택 대한소아청소년과학회 2008 Clinical and Experimental Pediatrics (CEP) Vol.51 No.9
Purpose:The objective of this study was to provide current estimates of the prevalence and examine trends of overweight and obesity in children and adolescents. Methods:Height and weight measurements from 183,159 (112,974 in 1997, 70,185 in 2005) children and adolescents aged 2 to 18 years were obtained via the 1997 and 2005 National Growth Survey. Obesity among children and adolescents was defined as being at or above the 95th percentile of the gender-specific body mass index (BMI) for age in the 2007 Korean National Growth Charts or a BMI of 25 or higher; overweight was defined as being at or above the 85th percentile to less than the 95th percentile BMI. Results:In 2005, 9.7% (11.3% for boys, 8.0% for girls) of South Korean children and adolescents were obese; 19.0% (19.7% for boys, 18.2% for girls) were overweight or obese. The overall prevalence of obesity increased from 5.8% in 1997 to 9.7% in 2005 (from 6.1% in 1997 to 11.3% in 2005 for boys and from 5.5% in 1997 to 8.0% in 2005 for girls); the increasing trend was most evident in boys, especially those aged 13-18 years. Conclusion:The prevalence of obesity among children and adolescents increased significantly during the eight-year period from 1997 to 2005. This study suggests that we need to make a priority of developing strategies to control obesity in children and adolescents; the potential health effects of increases in obesity are of considerable public health importance. (Korean J Pediatr 2008;51:950-955) Purpose:The objective of this study was to provide current estimates of the prevalence and examine trends of overweight and obesity in children and adolescents. Methods:Height and weight measurements from 183,159 (112,974 in 1997, 70,185 in 2005) children and adolescents aged 2 to 18 years were obtained via the 1997 and 2005 National Growth Survey. Obesity among children and adolescents was defined as being at or above the 95th percentile of the gender-specific body mass index (BMI) for age in the 2007 Korean National Growth Charts or a BMI of 25 or higher; overweight was defined as being at or above the 85th percentile to less than the 95th percentile BMI. Results:In 2005, 9.7% (11.3% for boys, 8.0% for girls) of South Korean children and adolescents were obese; 19.0% (19.7% for boys, 18.2% for girls) were overweight or obese. The overall prevalence of obesity increased from 5.8% in 1997 to 9.7% in 2005 (from 6.1% in 1997 to 11.3% in 2005 for boys and from 5.5% in 1997 to 8.0% in 2005 for girls); the increasing trend was most evident in boys, especially those aged 13-18 years. Conclusion:The prevalence of obesity among children and adolescents increased significantly during the eight-year period from 1997 to 2005. This study suggests that we need to make a priority of developing strategies to control obesity in children and adolescents; the potential health effects of increases in obesity are of considerable public health importance. (Korean J Pediatr 2008;51:950-955)
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항공 MRO 산업 사례를 통한 해군 무기체계 정비방안 고찰
오경원,최현석,공창덕,박현범 항공우주시스템공학회 2014 항공우주시스템공학회지 Vol.8 No.2
MRO is important concept in military logistics. It is required to reforming military budget and manpower because of decreasing troops and other factors. For this reason, military logistics needs to change and improvement. MRO is necessary concept in this situation. In that case, How improve Naval Weapons Systems MRO for this changing time? For example, ROK air force applies Aerospace MRO industries in their Weapons Systems. But, ROK navy’s MRO concept is uncertain and current MRO is divided just three step, Organizational Maintenance, Field Maintenance, Depot Maintenance. So it is time to develop systematic MRO concept for improving Naval Weapons Systems and Logistics. In this research, This0 study is about expanded application of PBL and the need to make relationship between Private enterprise and Military.
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오경원 항공우주시스템공학회 2016 항공우주시스템공학회지 Vol.10 No.4
The primary aim for using a Korean Condition Based Maintenance (CBM) system is to maintain military operational readiness using Interactive Collection Analysis Systems (ICAS) installed on naval vessels. Other aims are to preemptively provision maintenance and supply functions, to guarantee economical management of logistical assets, and to implement data driven equipment life cycle management. In order to accomplish these aims, it is necessary to establish standard system conditions. However, because manufacturers do not provide the technology necessary for maintenance management, it is required to retain component performance maps for each piece of equipment, and to accumulate data about frequently occurring fault patterns. This study confirms the validity of component performance maps using micro gas turbines and provides accumulated data on machine break downs. This would allow real time equipment performance checks and present performance trends. Then analysis would provide solutions for maintaining the best machine operating conditions with detailed maintenance manuals for operators. This study is a basis for further research to investigate additional ways to develop CBM using data obtained from naval vessels used in actual military operations. 한국형 상태기준정비는 현재 한국해군 함정에 설치된 ICAS를 최대한 활용하여 전투준비태세를 완비하고, 선제적 정비/보급 지원과 군수자산의 경제적 운용, 데이터 기반 장비수명관리를 위한 것이다. 이러한 목적을 달성하기 위해서는 장비상태의 기준을 설정해야 하는데 이는 제작사에서 원천적인 기술을제공하고 있지 않아 각 장비별 성능 맵 확보가 필요하고 고장패턴 등의 자료 축적이 필요하다. 본 연구에서는 소형 가스터빈엔진을 활용하여 가스터빈 성능 맵을 확인하고 고장정보를 축적하여 실시간으로장비성능 확인과 성능 경향을 나타내게 하였고 이를 통해 운용자의 행동지침과 정비자의 검사 절차등을 명시하여 최적의 장비상태가 유지 될 수 있도록 솔루션을 개발하였다. 본 연구를 기반으로 실제 함정의 데이터를 이용한 상태진단기법 발전에 활용할 예정이다.
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Performance Evaluation of Excavator Control Device with EMG-based Fatigue Analysis
오경원,홍대희,김동남 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.15 No.2
Among the many types of construction equipment, excavators have been widely used due to their versatility in various operations such as digging, crushing, and breaking, etc. In order to achieve more intuitive and intelligent control of the excavator, a new control device has recently been developed to replace the conventional joystick installed in excavators. This paper focuses on a performance evaluation method for this control device in order to determine its feasibility. The fatigue analysis method based on Electromyography (EMG) is utilized to evaluate the control performance of the devices with the assumption that fatigue can be the most critical criterion when determining an appropriate control device. Fatigue was determined by analyzing the EMG amplitude as well as the frequency spectrum. In order to investigate the feasibility of the proposed method, two different control devices are tested for performing leveling work: a haptic device and the conventional joystick lever. Through the experimental studies, it was found that the haptic device produced less muscular fatigue and the feasibility of the evaluation method was also verified.
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