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실린더 압력 분석을 이용한 터보 디젤 엔진의 밸브 타이밍 최적화
강용석(YongSeok Kang),이형상(HyeongSang Lee),김영호(YoungHo Kim),팽정환(JeongHwan Paeng),전제록(JeRok Chun) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The intake and exhaust valve timing were optimized in order to improve low-end torque without rated power decrease in both R-2.0L and R-2.2L turbocharged diesel engines which shares head assembly in common. The variants for engine test were determined by the simulation using GT-power. Intake and exhaust cam profile were varied from the base configuration up to -4% in IVC (early direction) and +6% in EVO (early direction). As a result of valve timing optimization, -4%(IVC) and +5%(EVO), low-end torque was improved by 4.6% in R-2.0L and 3.1% in R-2.2L without any decrease in overall performance.
Influence of Compressive Stress in TGO Layer on Impedance Spectroscopy from TBC Coatings
Kang, To,Zhang, Jianhai,Yuan, Maodan,Song, Sung-Jin,Kim, Hak-Joon,Kim, Yongseok,Seok, Chang Sung The Korean Society for Nondestructive Testing 2013 한국비파괴검사학회지 Vol.33 No.1
Impedance spectroscopy is a non-destructive evaluation (NDE) method first proposed and developed for evaluating TGO layers with compressive stress inside thermally degraded plasma-sprayed thermal barrier coatings (PS TBCs). A bode plot (phase angle (h) vs. frequency (f)) was used to investigate the TGO layer on electrical responses. In our experimental study, the phase angle of Bode plots is sensitive for detecting TGO layers while applying compressive stress on thermal barrier coatings. It is difficult to detect TGO layers in samples isothermally aged for 100 hrs and 200 hrs without compressive stress, and substantial change of phase was observed these samples with compressive stress. Also, the frequency shift of the phase angle and change of the phase angle are observed in samples isothermally aged for more than 400 hrs.
( Yongseok Kim ),( Hophil Min ),( Changmin Sung ),( Ju-hyung Park ),( Junghyun Son ),( Kang Mi Lee ),( Ho Jun Kim ),( Jaeick Lee ),( Oh-seung Kwon ),( Ki Hun Kim ) 한국질량분석학회 2016 Mass spectrometry letters Vol.7 No.4
Glycerol was identified and isolated from endogenous interferences during analysis of human urine using high-resolution mass spectrometry (HRMS) for doping control. Urinary sample preparation was simple; the samples were diluted with an organic solvent and then analyzed using a liquid chromatography-mass spectrometry (“dilute and shoot” method). Although the interfering ion peaks were observed at the similar retention time of glycerol, the inference could be identified by isolation with HRMS and further investigation. Thus, creatinine was identified as the endogenous interference for glycerol analysis and it also caused ion suppression resulting in the decrease of glycerol signal. This study reports the first identification and efficient isolation of endogenous interferences in human urine for “dilute and shoot” method. The information about ion suppression could be novel to prevent overestimation or a false result for antidoping analysis.
강경훈,홍대기,김태현,이용석 한국경영과학회 2002 한국경영과학회 학술대회논문집 Vol.- No.1(1)
기업간 비즈니스연동(B2Bi; B2B Integration)은 비즈니스 문서(예:XML) 교환을 통해 기업 및 마켓플레이스 간의 비즈니스 프로세스의 처리를 자동화하는 것 또는 자동화할 수 있는 환경을 구성하는 것을 의미한다. e-Marketplace의 등장, 파트너기업과의 보다 긴밀한 협업의 필요성 증대 등의 이유로 B2Bi에 대한 수요가 증가하고 있는 실정이다. 본 논문에서는 국내 B2B e-Marketplace에서 B2Bi를 구현한 사례를 바탕으로, 기업간 문서의 송수신 및 가공, 흐름제어, 저장소, 어플리케이션 어댑터 관점에서 B2Bi 솔루션 개발에 관한 연구 결과를 설명하고자 한다.
( Yongseok Kim ),( Dawon Jeong ),( Hophil Min ),( Changmin Sung ),( Ju-hyung Park ),( Junghyun Son ),( Kang Mi Lee ),( Ho Jun Kim ),( Jaeick Lee ),( Oh-seung Kwon ),( Ki Hun Kim ) 한국질량분석학회 2017 Mass spectrometry letters Vol.8 No.2
Meldonium is a drug for treating ischemia by expanding the arteries but it can also enhance the performance of sports players. The World Anti-Doping Agency (WADA) has included it in the list of prohibited substances since 2016. Meldonium is one of the challenging substances for anti-doping testing because it is difficult to recover by general liquid-liquid or solid phase extraction due to its permanent charge and high polarity. Therefore, high-performance liquid chromatography (HPLC) is cur-rently used by injecting a diluted urine sample (known as the “dilute-and-shoot” strategy). There is no loss of target compounds in the extraction/cleanup procedure but its high matrix effect could interfere in their separation or detection from the endogenous urinary compounds. We report a single method using high-resolution mass spectrometry that can be used for both screening and confirmation, which follows the “dilute-and-shoot” strategy. In this method, the endogenous compounds` interfering peaks in the mass spectrum are separated at a high resolution of FWHM 140,000, and the results are suitable for substance detection follow-ing the WADA guidelines. The interferences in the obtained mass spectrum of the urine matrix are identified as acetylcholine, lysine, and glutamine by further analysis and database searching. Validation of the method is performed in routine anti-doping testing, and the limit of detection is 50 ng/mL. This method uses simple sample preparation and a general reverse phase HPLC column, and it can be easily applied to other substances.
김용석 ( Yongseok Kim ),최원준 ( Wonjun Choi ),심교문 ( Kyo-moon Shim ),허지나 ( Jina Hur ),강민구 ( Mingu Kang ),조세라 ( Sera Jo ) 한국농림기상학회 2021 한국농림기상학회지 Vol.23 No.4
본 연구에서는 서리발생과 관련된 기상요인을 선정하여 랜덤포레스트(RF)를 이용한 서리발생 유무 분류 모형을 구축하였고, 이와 더불어 기상인자의 중요도와 데이터 세트를 구성하는 방법들을 비교하는 실험을 수행하였다. 그 결과, 서리발생에 대한 분류 모형을 구축할 경우에 데이터 세트의 양이 많더라도 모형 구축을 위해 학습하기 위한 데이터 세트에서 특정 값이 월등히 많은 불균형은 모형의 예측력에 좋지 못한 영향을 미치는 것으로 분석되었다. 또한, 이번 연구에서 수집된 25지역의 서리발생과 관련된 기상요인에 대해 지역별로 그룹화하여 중요도가 높은 기상요인을 반영한 모형 구축하는 것보다 하나의 통합된 모형을 구축하는 것이 더 효율적인 것으로 나타났다. 이번 연구를 통해 분석된 결과와 서리예측을 위한 기상요인에 대한 추가 분석 연구를 수행한다면 정확도 높은 서리발생 예측 모형을 구축할 수 있을 것이라 예상한다. In this study, we constructed using Random Forest(RF) by selecting the meteorological factors related to the occurrence of frost. As a result, when constructing a classification model for frost occurrence, even if the amount of data set is large, the imbalance in the data set for development of model has been analyzed to have a bad effect on the predictive power of the model. It was found that building a single integrated model by grouping meteorological factors related to frost occurrence by region is more efficient than building each model reflecting high-importance meteorological factors. Based on our results, it is expected that a high-accuracy frost occurrence prediction model will be able to be constructed as further studies meteorological factors for frost prediction.