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( Yongcheol Kim ),( Jun-won Lee ),( Sang Yeub Lee ),( Jang-whan Bae ),( Sang Jun Lee ),( Myung Ho Jeong ),( Seung-hwan Lee ),( Youngkeun Ahn ) 대한내과학회 2021 The Korean Journal of Internal Medicine Vol.36 No.0
Background/Aims: Recently, distal radial approach (DRA), called as snuffbox approach, has gained the interest of interventional cardiologists, but there is a lack of data about the feasibility of DRA as an alternative route for primary percutaneous coronary intervention (PCI). Methods: A total of 138 patients presenting with ST-elevation myocardial infarction (STEMI) in whom primary PCI via the DRA was attempted at three hospitals from October 2017 to September 2019 were analyzed. Results: The success rate of snuffbox puncture in the setting of STEMI was 92.8% (128/138). Successful primary PCI via the DRA was achieved in all 128 patients. The snuffbox puncture time, defined as the time interval from local anesthesia induction to successful sheath cannulation, was 2.7 ± 1.6 minutes, and snuffbox puncture was performed within 5 minutes in 95.3% of patients. Moreover, the percentage of the puncture time in the door-to-balloon time was 3.3%. The left DRA was selected in 103 patients (80.5%), and primary PCI via the DRA was performed using a 6-Fr guiding catheter in 125 patients (97.7%). There was no major bleeding; however, there were four cases (3.1%) of access-site complications, including three cases of local hematoma (≤ 5 cm diameter) and one case of local numbness, which improved 3 months later. Conclusions: In the setting of STEMI, the DRA could be a feasible alternative access route for primary PCI.
강용철(Yongcheol Kang),이병은(Byungeun Lee),이현웅(Hyunwoong Lee),김유다(Judah Kim),박준수(Junsu Park),이미선(Misun Lee),박지연(Jiyeong Park),이보은(Boeun Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
A current differential relay has been used for transmission line protection. The relay may maloperate in the case of a failure of the secondary circuit of a current transformer (CT) because the differential current is produced. This paper presents an algorithm to detect a failure of a CT using the zero-sequence current. If the magnitude of the zero-sequence current is the same as the magnitude of the current of the other healthy phases, a failure of a CT is detected and then the blocking signal is activated. The proposed algorithm prohibit the maloperation of a differential relay in the case of a CT failure and thus increase the security of the relay.
Yongcheol Park,Won Sang Lee,Choon-Ki Lee,Jin-Seok Kim,Jiwoong Chung 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
The Extreme Geophysics Group (EGG) at the Korea Polar Research Institute (KOPRI) have installed a broadband seismic network called Korea Polar Seismic Network (KPSN) around Mt. Melbourne since 2011. The KPSN, currently, spreads from the Mt. Melbourne to the upstream of the David Glacier with 17 broadband seismic stations and one infrasound network at the Jang Bogo station. The division of Polar Earth-system Science focused on the research named “Characterizing mantle domain beneath West Antarctic Rift System and Antarctic mid-ocean ridges”, and install OBSs (Ocean Bottom Seismographs) in the sea near the Jang Bogo station to extend the observing coverage of the KPSN. The P-wave upper mantle velocity structure was modeled using the teleseismic events observed on the KPSN and the Transantarctic Mountains Northern Network (TAMNNET) to extend the spatial coverage to the model. Our model shows two separate low-velocity anomalies at ~150km depth located beneath the Terra Rift and inland area of the Mt. Melbourne, respectively, but the tow anomalies connected below the ~150km depth and extend to ~300km depths. The ~300km depth extent of the low-velocity anomaly indicates the Terra Rift might be not an active rifting system.
Phenolic compounds and antioxidant activity of berries produced in South Korea
( Yongcheol Lee ),( Jea-kyoo Lee ),( Jeong-gon Kim ),( So-hyun Park ),( Young-eun Kim ),( Sung-kyu Park ),( Moo-sang Kim ) 한국응용생명화학회(구 한국농화학회) 2020 Journal of Applied Biological Chemistry (J. Appl. Vol.63 No.4
Berries are rich sources of phenolic compounds, which are known to have health-promoting effects. In this study, phenolic compounds of seven popularly consumed berries were analyzed by HPLC-ESI-MS/MS. In addition, 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical and nitrite scavenging activities were investigated for comparison of the biological activity of the berry extracts. Chlorogenic acid was the major phenolic acid, which had the highest content in aronia, followed by blueberry. The rutin and isoquercetin contents were the highest in mulberry, followed by aronia, black raspberry, and blueberry. The anthocyanin content was the highest in black raspberry. Aronia showed the highest DPPH free radical and nitrite scavenging activities with the highest contents of total phenolics and proanthocyanidins.