초소수성 멤브레인

김형원,Kim, Hyeong-Won 한국플랜트학회 2012 플랜트 저널 Vol.8 No.3

비동기 다중레이더 환경에서 의사 측정치를 이용한 바이어스 추정기법

김형원,김도형,박효달,송택렬,Kim, Hyoung-Won,Kim, Do-Hyeung,Park, Hyo-Dal,Song, Taek-Lyul 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6

In this paper, a sensor bias estimation method with pseudo measurement for asynchronous multisensor systems is proposed. The proposed bias estimation method separates the local filter which estimates the target state with biased measurements into two parts, one is bias part, the other is target state part. By using these two parts, the algorithm generates the pseudo bias measurement for estimating bias, and then eliminates bias of local track through bias compensation. Finally, the proposed algorithm is evaluated by comparing with the existing EXX method.

순차적 정보융합을 이용한 비동기 다중 레이더 환경에서의 바이어스 추정기법

김형원,박효달,송택렬,Kim, Hyoung Won,Park, Hyo Dal,Song, Taek Lyul 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.5

This paper presents a sensor bias estimation method with serial fusion for asynchronous multisensory systems. Serial fusion processes the sensor measurements in a first-come-first-serve basis and it plays an essential role in asynchronous fusion in practice. The proposed algorithm generates the bias measurements using fusion estimates and sensor measurements for bias estimation, and compensates the sensor biases in fusion tracks. A simulation study indicates that the proposed algorithm has the superior performance in bias estimation and accurate tracking.

Total Hip Arthroplasty for Osteonecrosis of the Femoral Head Following Cardiac Transplantation - A Case Report -

김형원,윤택림,조용진 대한고관절학회 2010 Hip and Pelvis Vol.22 No.2

Cardiac transplantation has become the treatment of choice for end stage heart disease, and the long-term survival rates of cardiac transplant patients continue to improve, due to the continued improvements made in operation methods and postoperative immunological therapies. However, the incidences of disabling orthopedic complications,such as, osteopenia, osteoporosis, fractures, and osteonecrosis, have been increased by the postoperative administrations of steroids and immunosuppressive agents. Accordingly, several orthopedic surgeons have evaluated treatments for these complications, and a number of reports have been issued on osteonecrosis after cardiac transplantation. However, all of these reports have been issued is the US and European countries, and in particular, no report has been published on osteonecrosis following cardiac transplantation in an Asian patient. In this report, the authors report the case of a patient who underwent total hip arthroplasty due to osteonecrosis of the femoral head after cardiac transplantation.

세 어머니께 허락받은 결혼

김형원 샘터사 2017 월간 샘터 Vol.572 No.-

Graphite/Epoxy로 만든 두꺼운 관의 저속 충격손상에 관한 연구

김형원,윤영주,나성엽 한국추진공학회 2000 한국추진공학회 학술대회논문집 Vol.2000 No.4

침투실험을 통한 투수성 포장재의 흙-수분특성곡선 역해석

김형원,안재훈,신현석 한국방재학회 2015 한국방재학회논문집 Vol.15 No.6

Permeable pavement systems, an Low Impact Development technique, are widely used for pedestrian and bicycle roads, and parking lots, to relieve the flooding and enhance water cycle, which arises due to climate change and urbanization. However, due to lack of analytical means, permeable pavements are constructed most of time without knowing their performance in reducing runoff. In this paper, saturated permeability and porosity of a pervious concrete sample were experimentally estimated, and a set of infiltration model test was conducted; then, finally, the soil-water characteristics curve of the sample was back-calculated. In inverse analysis, van Genuchten model was selected, and Levenberg-Marquardt method was used for parameter searching algorithm. The results of soil-water characteristics curve presents the air-entry suction pressure is little below 1 kPa, and all the water expels at a suction pressure of 10 kPa. When compared to typical sands, the volumetric water content of pervious concrete drops more steeply with increasing suction pressure. 최근 기후변화와 지속적인 도시화로 인한 도심 홍수 및 물순환의 왜곡을 해결하기 위한 저영향개발 기법 중 하나로 투수성 포장시스템이 보도, 주차장, 자전거 도로 등 경하중 하의 포장시설로서 활발하게 적용되고 있으나, 평가 및 해석방법의 미비로 투수성 포장은 많은 경우 유출저감효과에 대한 정량적 해석 없이 적용되고 있다. 본 논문에서는 투수성 포장을 구성하고 있는 다공성 재료에서의 침투해석을 위해 필요한 주요 물성치인 포화투수계수와 간극률을 시험을 통해 산정하고, 침투모형실험을 통해 투수성 콘크리트의 침투특성을 관찰한 후, 본 결과를 사용하여 투수성 콘크리트의 흙-수분특성곡선을 역해석한다. 역해석을 위한 흙-수분특성곡선 모델로는 van Genuchten 모델을 사용하였고, 계수조정 알고리즘은 Levenberg-Marquardt 방법을 사용하였다. 투수성 콘크리트 시료의 흙-수분특성곡선은 포화상태에서 흡입압력이 1 kPa보다 작은 지점부터 불포화가 되기 시작하여, 흡입압력이 10 kPa에 이르러서는 체적함수비가 0에 가까운 상태에 이르렀으며, 사질토와 비교했을 때 흡입압력의 증가에 따라 체적함수비의 감소가 더 급격한 경향을 보이는 것을 확인하였다.

탄소중립 청정 수소생산 및 응용 기술동향

김형원 한국플랜트학회 2023 플랜트 저널 Vol.18 No.4

Effects of cold water immersion and protein intake combined recovery after eccentric exercise on exercise performance in elite soccer players

김형원,주창화 한국운동재활학회 2023 JER Vol.19 No.2

The purpose of this study is to analyze the effects of the combined recovery method of cold water immersion (CWI) and protein supplement intake after eccentric exercise that causes muscle fatigue in elite soccer players. Eleven semiprofessional soccer players participated in this study. Participants were divided into CWI group, combined protein and CWI group (PCWI), and passive resting group (CON). The participants completed the eccentric exercise for one hour and performed one of three recovery methods. The muscle strength of the quadriceps and hamstring muscles significantly decreased at 48-hr postexercise compared to before exercise in all recovery groups (P< 0.05), with no significantly different between the recovery groups. The time required to sprint 40 m was significantly longer in all groups at 24 hr and 48 hr after exercise than before exercise (P< 0.05). The vertical jump height was significantly decreased at 48 hr after exercise compared to before exercise in the CON and CWI groups (P< 0.05). The muscle soreness values were higher at 6 hr, 24 hr, and 48 hr after exercise than before exercise in all groups (P< 0.001). The perceived recovery quality was reduced after exercise in the PCWI (P< 0.01) and CON groups (P< 0.001) compared to before exercise; it was unchanged in the CWI group. The recovery quality decreased at 6 hr, 24 hr, and 48 hr after exercise in all recovery groups (P< 0.01). In conclusion, the combined recovery method was less effective than CWI alone for the recovery of exercise performance.

고등학교 사회 수학 융합 프로그램이 수학 교과 태도에 미치는 효과성 분석

김형원,고호경 한국학교수학회 2017 韓國學校數學會論文集 Vol.20 No.3

본 연구는 고등학교 학생의 수학에 대한 가치 인식 및 흥미를 증진시키는 방안을 모색하 는데 일환을 두고 수행되었다. 이와 같은 교육적 목적을 달성하기 위해서는 단편적 교과 지 식의 학습 보다는 융합적인 접근을 통해 학생들이 자신의 지식을 적용할 기회가 제공되어야 한다는 주장에 따라 사회와 수학을 융합한 프로그램을 개발하고 그 적용 효과를 파악하고자 하였다. 효과성 검증을 위한 데이터 수집은 일반계 고등학교 학생들을 대상으로 사회 수학 프로그램 적용에 따른 사전 사후 설문을 통해서 이루어졌다. 사회 수학 프로그램은 실생활에 서 나타나는 사회적 현상을 수학적 관점에서 문제를 해결하고자 하는 시도로서, 적용 결과 학생들은 수학 학습 및 사회 학습에 대한 태도, 수학 학습 및 사회 학습 가치 인식에 효과적인 것을 확인할 수 있었다. The study in this paper considers how high school students’ attitudes toward and interest in mathematics could be promoted by conjoining the learning of ma thematics with the learning of social science topics. Survey instrument was dev eloped to measure student attitudes toward mathematics and social science subje cts and to evaluate student beliefs on learning mathematics embedded in social science topics. Data were collected from high school students in Korea by admi nistering pre- and post-tests: students were intervened with examples of math problems embedded in certain social contexts. The findings indicate that high sc hool students’ experience of solving mathematics problems embedded in social c ontexts positively affects the promotion of their attitudes toward and beliefs on both mathematics and social science subjects.