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항혈소판제제와 프로톤펌프억제제 간의 약물 상호 작용: Unsafe 측면과 대책
이경훈 ( Kyounghoon Lee ),한승환 ( Seung Hwan Han ) 대한내과학회 2011 대한내과학회지 Vol.81 No.1
Clopidogrel is a prodrug that is converted in the liver to an active thiol metabolite, which irreversibly inhibits the platelet P2Y12 adenosine diphosphate receptor. This mechanism requires cytochrome P450 2C19 (CYP 2C19) enzyme. Proton pump inhibitors(PPIs) competes against CYP 2C19 and inhibits the conversion of clopidogrel into its active metabolite, therefore, clopidogrel-PPIs drugs interaction may exist. These interactions could result in competitive inhibition decreasing the conversion of the clopidogrel pro-drug to the active metabolite and could potentially translate into an increased risk for cardiovascular events by inadequate platelet P2Y12 receptor inhibition. Many studies including retrospective cohort studies and studies using platelet function tests demonstrated the possible interactions between clopidogrel and PPIs leading to a decrease in the antiplatelet efficacy of clopidogrel and worse cardiovascular clinical outcomes than clopidogrel alone. In contrast, few comparative trials using clinical outcomes found no serious drug interactions between them. In this review, we introduce possible harmful effects of combined use of clopidogrel and PPIs on platelet function. In addition, we suggest how to overcome clopidogrel-PPIs interactions. (Korean J Med 2011;81:34-39)
조업선에서 수집한 음향자료에 대한 잡음 제거 기법에 관한 연구
이형빈 ( Hyungbeen Lee ),최석관 ( Seok Gwan Choi ),이경훈 ( Kyounghoon Lee ),이재봉 ( Jae Bong Lee ),이종희 ( Jong Hee Lee ),최정화 ( Jung Hwa Choi ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.3
The Commission for Conservation of Antarctic Marine Living Resources (CCAMLR) is utilized to manage krill resources using acoustic data collection and a scientific observer program operating on the fishing boats. However, the acoustic data were contained seriously noise, example of background, spike, and intermittent noise, due to purpose of fish boats. In this study, the noise removal techniques were confirmed the potential of the acoustic data analysis. Acoustic system and frequency used in the survey were commercial echosounder (ES70, SIMRAD) and 200 kHz split beam transducer. Acoustic data were analyzed using Echoview software (Myriax), and general data analysis and new noise removal method was used. Although a variety of noise, most of the noises have been removed using the noise removal processing. We confirmed the possibility of analyzing the acoustic data obtained from fish boats. The results will be useful for analysis of the acoustic data acquired from krill fishing boats.
음향 실험 및 모델 기법을 이용한 도루묵 (Arctoscopus japonicus)의 음향산란반사강도 특성
이형빈 ( Hyungbeen Lee ),이경훈 ( Kyounghoon Lee ),윤은아 ( Eun A Yoon ),황강석 ( Kangseok Hwang ),최정화 ( Junghwa Choi ),박태건 ( Tae Geon Park ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.3
Acoustic target strength (TS) measurement and theoretical acoustic scattering models were applied to estimate the TS for assessing the fish biomass. TS measurement was made of ex situ sailfin sandfish Arctoscopus japonicus at 70 and 120 kHz, and then compared to backscatter model prediction. The live sandfish was tethered in seawater using monofilament lines. Measurements were made versus incidence angle, -50° to 50° relative to dorsal aspect directions. Distorted wave Born approximation (DWBA) model was used to calculated TS pattern. The TS values of sandfish (body length: 16.2 cm) at 70 and 120 kHz were -66.94 dB and -64.45 dB, respectively, and were about 20 dB lower than TS of other fishes in Korea waters. These TS levels were distributed within the range of the theoretical TS. Ex situ measurement and theoretical TS may be applied to improve acoustical detection and biomass estimation of the sandfish, and is necessary to measure with various lengths.
전투 차량 전복 안전성 평가 및 전복 시 승무원의 거동에 대한 연구
김호범(Hobum Kim),이경훈(Kyounghoon Lee),이강운(Kangwun Lee),김종현(Jonghyun Kim),이정엽(Jeongyub Lee),정의진(Ui-Jin Jung),박경진(Gyung-Jin Park) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The wheeled armored vehicle has a high center of gravity, and it operates on unpaved and sloped roads. Therefore, this vehicle has a high risk of rollover crashes. To design the interior of the military vehicle, the crew’s safety during rollover crashes is an important factor. However, there are restrictions in designing the space and the safety devices of the vehicle. In this paper, nonlinear dynamic analysis is performed to simulate the rollover crashes and the passenger injury is assessed with an existing vehicle model. Moreover, designs of a headrest and a seat belt are proposed to reduce passenger injury. The results of passenger injury are compared with a previous design. HyperWorks and LS-DYNA are used for the finite element modeling and nonlinear dynamic analysis, respectively.
김병관 ( Pyungkwan Kim ),이경훈 ( Kyounghoon Lee ),김도훈 ( Dohoon Kim ),이건호 ( Geonho Lee ),안희춘 ( Heui Chun An ),김성훈 ( Seonghun Kim ),양용수 ( Yongsu Yang ) 한국어업기술학회 2015 수산해양기술연구 Vol.51 No.4
The coastal stow net (stow net hereafter) in Korea is one of the major fishing methods for yellow croaker (Larimichthys polyactis), ribbon fish (Trichiurus lepturus), and anchovy (Engraulis japonicus). In terms of energy efficiency, the stow net fishery is more competitive than towing fishing gears such as trawl gears. The fishing vessels in stow net fishery have consumed less fossil fuel and also have had less carbon dioxide emission into the atmosphere. however, the stow net fishery is necessary to be regulated due to its increased output of the fleet. Therefore, it is required for fisheries authorities to manage the fishing capacity or fishing power for the assurance of fishery’s sustainability. For fisheries management authorities, it is necessary to quantify data related to fishing capacity and fishing power to deploy fishery policy in a sustainable way. In terms of data for decision-making, Data envelopment analysis (DEA) method was conducted to estimate fishing capacity. Fishing power index (FPI) was also applied to calculate relative fishing power to approach the problem in a quantitative way.
양용수 ( Yongsu Yang ),이경훈 ( Kyounghoon Lee ),배재현 ( Jaehyun Bae ),김성훈 ( Seonghun Kim ),박성욱 ( Seongwook Park ),박태일 ( Taeil Park ),구자선 ( Jasun Koo ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.3
Fish exportation using airplanes incurs sizable logistics costs (12,000KRW/kg), according for more than 45% out of the total export cost. Thus, it is unreasonable to quantitatively expand fish exportation by means of air transport. In addition, cases of failing to deliver fish at the right time to the right place occurs frequently due to the limited cargo capacity and insufficient cargo space of airplanes, especially during the peak season. Therefor, a technology that not only minimizes the logistics costs but also transports fish freshly and safely, in the case of long distance exportation to countries such as the United States and Taiwan, should be developed. In this study, a live fish container control system for long distance transportation was designed and implemented. Live flatfish (2,000kg) were selected as the target fish, were transported to the United States to analyze and verify the performance of the a live fish container control system and transportation ability.
박성욱(Seongwook PARK),이경훈(Kyounghoon LEE),윤원득(Won-Duk YOON),이동길(Dong-Gil LEE),김성훈(Seonghun KIM),양용수(Yong-Su YANG),이건호(Geon-Ho LEE) 한국수산해양교육학회 2015 水産海洋敎育硏究 Vol.27 No.1
As methods reducing damages by jellyfish which enter the coastal areas of Korea, attaching cutting devices to towing nets of otter trawls or pair trawls and/or using a canvas type of cutting nets of small fishing boats have been widely utilized. In order to reduce shut-down damages of power plants in coastal areas due to the mass influx of marine organisms including jellyfish, a possible improvement of the traveling water screen system and various jellyfish influx blocking devices were suggested in this study. The results could be utilized as an important index for reducing damages by jellyfish bloom which cause on a massive scale in summer in Korea.
고속열차 교행시 차량 실내 · 외 압력변동에 관한 수치적 연구
문성목(Seongmok Moon),이경훈(Kyounghoon Lee) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
A three-dimensional unsteady computational study is performed to assess the inside and outside pressure variation of two high-speed trains passing by each other, and to estimate the aural discomfort of the passenger through comparisons between the computed results and the safety criterion of domestic trains. The dynamic mesh technique and the smooth starting approach are adopted to simulate the transient vehicle movement. During passing by each other in the tunnel, complex pressure wave interactions within the tunnel occur due to the pressure waves by the opposite train. It leads to the rapid pressure variation on the internal and external surface of vehicle, and finally results in the aural discomfort of the passengers. Computed results show that the internal maximum pressure variations during passing by each other in the tunnel meet the safety criterion of vehicle. In addition, the internal maximum pressure variation when two trains pass by each other in the tunnel increase 1.5 to 2 times more than that when one train travels in the tunnel.
3차원 패턴 레이저를 이용한 유영어류의 형태 및 크기 측정
양용수 ( Yongsu Yang ),이경훈 ( Kyounghoon Lee ),편용범 ( Yongbeom Pyeon ),윤은아 ( Eun A Yoon ),이동길 ( Dong Gil Lee ),조현수 ( Hyun Su Jo ) 한국어업기술학회 2016 수산해양기술연구 Vol.52 No.2
This study aims to estimate the species, size and shape of fish using a non-contact 3 dimensional pattern laser so that this preliminary test was carried out to understand the structural feature and length of goldfish according to water turbidity and depth in the aquacultural tank. 3-D pattern laser could clearly detect its morphological shape except the caudal fin due to soft tissue. Since the sensing strength of line laser light according to depth has sufficient power, it is possible to measure its depth and structural feature in the detected range. The result showed that the measured error of individual`s fork length was less than ±1% in the water using 3-D pattern laser, when compared with the measured value in the air.