http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Minsung Cho,Hyeok-Hee Lee,Jang-Hyun Baek,Kyu Sun Yum,Min Kim,Jang-Whan Bae,Seung-Jun Lee,Byeong-Keuk Kim,Young Ah Kim,JiHyun Yang,Dong Wook Kim,Young Dae Kim,Haeyong Pak,Kyung Won Kim,Sohee Park,Seng 한국역학회 2024 Epidemiology and Health Vol.46 No.-
OBJECTIVES: The escalating burden of cardiovascular disease (CVD) is a critical public health issue worldwide. CVD, especially acute myocardial infarction (AMI) and stroke, is the leading contributor to morbidity and mortality in Korea. We aimed to develop algorithms for identifying AMI and stroke events from the National Health Insurance Service (NHIS) database and validate these algorithms through medical record review. METHODS: We first established a concept and definition of “hospitalization episode,” taking into account the unique features of health claims-based NHIS database. We then developed first and recurrent event identification algorithms, separately for AMI and stroke, to determine whether each hospitalization episode represents a true incident case of AMI or stroke. Finally, we assessed our algorithms’ accuracy by calculating their positive predictive values (PPVs) based on medical records of algorithm-identified events. RESULTS: We developed identification algorithms for both AMI and stroke. To validate them, we conducted retrospective review of medical records for 3,140 algorithm-identified events (1,399 AMI and 1,741 stroke events) across 24 hospitals throughout Korea. The overall PPVs for the first and recurrent AMI events were around 92% and 78%, respectively, while those for the first and recurrent stroke events were around 88% and 81%, respectively. CONCLUSIONS: We successfully developed algorithms for identifying AMI and stroke events. The algorithms demonstrated high accuracy, with PPVs of approximately 90% for first events and 80% for recurrent events. These findings indicate that our algorithms hold promise as an instrumental tool for the consistent and reliable production of national CVD statistics in Korea.
Self-erasable titanium oxide resistive memory devices
Jang, Jingon,Choi, Han-Hyeong,Kim, Minsung,Kim, Jai Kyeong,Chung, Seungjun,Park, Jong Hyuk Elsevier 2019 Journal of industrial and engineering chemistry Vol.78 No.-
<P><B>Abstract</B></P> <P>We fabricated a titanium oxide (TiO<SUB>2</SUB>) resistive memory device utilized to naturally erasable device with a simple cross-bar array structure inhibiting sneak paths using selecting property. The Al/TiO<SUB>2</SUB>/Al memory device showed conventional nonvolatile and bipolar resistive switching properties with a vacancy-based drift conduction procedure. The conducting filament could be removed through redistribution of the oxygen vacancy to the active bulk region resulting in self-erasable properties, which have made it possible to guide unwanted information to be removed naturally. This self-erasable memory device has the potential to be utilized for the storage of susceptible information which should be eliminated after a sufficient length of time.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Minsung Kang ),( Mir Yoo ),( Jimin Jang ),( Jaseon Oh ),양상진 대한운동사협회 2022 대한운동사협회 운동사대회자료집 Vol.2022 No.-
Background: There were not many case studies that conducted exercise programs by evaluating individual fitness levels in exercise prescriptions in patients with chronic renal failure. Objectives: The goal was to evaluate the physical fitness level of patients undergoing peritoneal dialysis treatment, and to investigate the effect of exercise on physical ability and blood levels. Methods: The effect of the 12-week exercise program on creatinine and albumin levels among SFT results and blood levels were analyzed in 54-year-old female patients receiving peritoneal dialysis treatment. Results: Among the SFT items before and after exercise, there was a significant increase in CS30 Test and Biceps Curl Test, 2.45Mup and go Test, and a significant increase in Proprioception Test, but there was no significant difference in blood creatinine and albumin levels. Conclusions: Although not all physical fitness tests and blood levels showed improvement, there were significant differences in physical abilities such as muscle strength.
Kwon Minsung,Sung Jang Hyun,Kim Tae-Woong,Ahn Jaehyun 한국수자원학회 2018 한국수자원학회논문집 Vol.51 No.10
본 연구에서는 표준강수지수를 이용하여 가뭄사상을 정의하고, 가뭄심도와 부족 강수량을 대상으로 이변량 가뭄빈도해석을 수행하였다. 부족강 수량은 표준강수지수의 가뭄기준인 -1에 해당하는 강수량을 기준으로 산정하였다. 지금까지 연구에서 가뭄지수의 심도와 지속기간 이용한 빈도해석을 통한 가뭄의 평가가 주를 이루었다. 하지만 이 두 변량은 선형적인 관계가 매우 높아 각 변량에 대한 단변량 빈도해석과 비교하여 정보의 확장성은 크지 않다. 2015년 가뭄의 경우, 서울, 양평, 충주지점의 ‘가뭄심도-부족 강수량’량의 재현기간은 모두 300년 이상의 극심한 가뭄을 나타내고 있지만, ‘가뭄심도-지속기간’에서는 재현기간을 약 10년, 50년, 50년으로 평가하여 큰 차이를 나타냈다. 우기를 포함한 가뭄은 강수량 부족이 심각할지라도 가뭄심도는 가뭄을 상대적으로 낮게 평가할 수 있어 실제 가뭄의 심각성을 나타내는데 한계가 있었다. ‘가뭄심도-부족 강수량’ 빈도해석 결과는 강수량의 절대적인 부족량 정보를 함께 포함하고 있어, 가뭄에 대응하기 위한 지표로 활용성이 높을 것으로 판단된다. This study evaluated drought severity by bivariate frequency analysis using drought magnitude and precipitation deficit. A drought event was defined by Standardized Precipitation Index (SPI) and the precipitation deficit was estimated using reference precipitation corresponding to the SPI -1. In previous studies, drought magnitude and duration were used for bivariate frequency analysis. However, since these two variables have a largely linear relationship, extensibility of drought information is not great compared to the univariate frequency analysis for each variable. In the case of drought in 2015, return periods of ‘drought magnitude-precipitation deficit’ in the Seoul, Yangpyeong, and Chungju indicated severe drought over 300 years. However, the result of ‘drought magnitude-duration’ showed a significant difference by evaluating the return period of about 10, 50, and 50 years. Although a drought including the rainy season was seriously lacking in precipitation, drought magnitude did not adequately represent the severity of the absolute lack of precipitation. This showed that there is a limit to expressing the actual severity of drought. The results of frequency analysis for ‘drought magnitudeprecipitation deficit’ include the absolute deficit of precipitation information, so which could consider being a useful indicator to cope with drought.
직접순환식 수직밀폐형 지열원 열펌프의 연간 운전성능 평가
김민성(Kim Minsung),우정선(Woo Joungson),백영진(Baik Young-Jin),장재철(Jang Jeachul),김지영(Kim Ji-Young),라호상(Ra Ho-Sang) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
Vertical closed-loop ground source heat pump systems(GSHP) have been installed widely in Korea since it can extract moderate temperature level of geothermal heat in a small area. As a ground heat exchanger, a vertical closed-loop type with brine circulation is mostly preferred since it is simple and less harmful to ground environment. However, it requires a secondary heat exchange loop between the refrigerant in a heat pump and the brine. By adding a geothermal heat exchanger in the secondary heat exchange loop, circulation pumps should be attached and the temperature difference between refrigerant and ground is increased, which are important pats of performance degradation. In this paper, annual and seasonal performances of direct expansion(DX) geothermal heat pump were estimated mathematically as an alternative of classical indirect geothermal heat pump based on the annual performance evaluation. As a result, DX geothermal heat pump showed 43% higher annual performance than the classical U-tube geothermal heat pump.