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차량용 SoC의 신뢰성 향상을 위한 CAN 통신 기반의 고장진단 플랫폼 설계
황도연(Doyeon Hwang),김두영(Dooyoung Kim),박성주(Sungju Park) 대한전자공학회 2015 전자공학회논문지 Vol.52 No.10
전자 산업의 발달과 함께 많은 전자 제어 장치가 차량 내부에 탑재됨에 따라 차량의 기능을 검증하는 것은 더더욱 어려워지고 있다. 차량의 기능 오작동은 인명손실의 우려가 있기 때문에 차량에 있어서 신뢰성은 무엇보다 중요하게 고려되어야 한다. 본 논문에서는 차량의 신뢰성 향상을 위한 CAN 통신 기반의 고장 진단 플랫폼을 제안한다. 양산 이후에도 독립적인 테스트 경로를 통한 구조적 테스트를 실시함으로써 차량의 신뢰성은 크게 증가할 것이다. 또한, 별도의 테스트 핀이 필요하지 않기 때문에 테스트 비용을 절감할 수 있다. To verify the function of vehicle is becoming more and more difficult because many electronic control units have been embedded in vehicle with development of electronics industry. The reliability of vehicle should be considered above all important because malfunction of vehicle can cause damage of human life. In this paper, defect diagnosis platform based on CAN network is proposed to improve the reliability of vehicle. Reliability of vehicle is significantly increased by adopting the structural test via dedicated test path after manufacturing. Besides, the test cost is reduced because additional test pins are not required.
분지관 내부 이동 물체 주위 비뉴턴 맥동류에 대한 CFD 기초해석
황도연(Doyeon Hwang),한병윤(Byungyun Han),유성수(Sungsu Yoo),이명수(Myungsu Lee),박형구(Hyung-Koo Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The objective of this study is to get simulation data about pulsatile flow around an interior solid body, which moves inside a bifurcated tube. All the processes were based on CFD method, with a commercial FVM code, SC/Tetra ver. 6.0 for solving, and with CATIA R16 for generating geometries. The bifurcated tube models were drawn with the bifurcated angle of 45 degrees, considering Murray's law about the diameter ratio. With respect to the motion of the object, the effects of flow on the drag were considered. For the pulsating flow condition, the velocity wave profile was given as the inlet boundary condition. To validate all the result, the simulation was compared with the existing data of the other papers first for the pulsatile flow condition and the inside drag calculation. Overall flow field of both data were similar, but there was some difference at a zero velocity. Therefore the next simulation was continued with the sine wave profiles where there is no negative flow, and then the data was compared with one of the pulmonary artery velocity where there is negative flow. The final process was to calculate flow variables such as the wall shear stress (WSS) and to compute the drag of the solid object.
증례 : 순환기 ; 중간정도 협착을 보이는 관상 동맥에서 발생한 급성심근경색
황도연 ( Doyeon Hwang ),김학령 ( Hack Lyoung Kim ),박찬순 ( Chan Soon Park ),이현정 ( Hyun Jung Lee ),진광남 ( Kwang Nam Jin ),조주희 ( Joo Hee Zo ) 대한내과학회 2015 대한내과학회지 Vol.89 No.4
Acute myocardial infarction often evolves from a mild coronary lesion. Therefore, the evaluation and management of intermediate coronary stenosis are important to prevent cardiac events. However, the decision on how to treat these lesions is challenging. Here, we report acute myocardial infarction occurring at a preexisting intermediate coronary stenosis based on invasive coronary angiography performed 10 days before the event. (Korean J Med 2015;89:448-451)
CFD 방법을 이용한 분지관에서 비뉴턴 유체 유동에 대한 기초해석
황도연(Doyeon Hwang),박형구(Hyung-Koo Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The objective of this paper is simulating the non-Newtonian flow through both bifurcated rigid tube model by the CFD method. Originally, this is the fundamental analysis of the blood flow through the blood vessel suffering from atherosclerosis. A commercial FVM code, which is SC/Tetra, is used for this purpose. To describe a non-Newtonian characteristic of the blood flow, the several viscosity models are used; the Powell-Eyring model, the Cross model, the Carreau model, and etc. The angle and the diameter of the branched children are co-related, and models of various sizes are used. Finally, the results are analyzed with regard to viscosity models and sizes. Such factors as the WSS(wall shear stress), the WSSG(wall shear stress gradient) and the velocity profile are investigated. The results are compared with the existing data. The analysis of factors above under more low shear stress condition should be required.
서울지역 교통수단별 이동시간과 호흡량을 고려한 미세먼지 흡입량 추정에 관한 연구
이용일,정원석,황도연,김태성,박덕신,Lee, Yong-Il,Jung, Wonseck,Hwang, Doyeon,Kim, Taesung,Park, Duckshin 한국입자에어로졸학회 2018 Particle and Aerosol Research Vol.14 No.4
Recently, people's interest in particulate matter (PM) has been increasing, due to its hazardous health effects. The purpose of this study was to investigate the concentrations and as well as the inhaled weight of PM, correlated with person's heart rate in subway, bus, vehicle and bicycle in the major public transportation (Sadang - Jamsil and Nowon - Dongdaemun) in Seoul. The concentration of $PM_{10}$ and $PM_{2.5}$ were measured from each of transportation means and calculated the average concentrations which were 87.2 and $57.8{\mu}g/m^3$ for subway, 62.8 and $42.5{\mu}g/m^3$ for vehicle, 61.5 and $36.8{\mu}g/m^3$ for bus and 53.0 and $29.4{\mu}g/m^3$ for bicycle in $PM_{10}$ and $PM_{2.5}$ respectively. Inhalation dose for $PM_{10}$ and $PM_{2.5}$ were estimated at 248.1 and $139.4{\mu}g$ for bicycle, 56.7 and $39.3{\mu}g$ for vehicle, 49.4 and $29.9{\mu}g$ for bus and 44.3 and $29.1{\mu}g$ for subway, respectively. Even though subway had the highest concentration, the highest inhalation dose was the bicycle. It was due to the long travel time-exposure and breathing rate which leads to maximum of $PM_{10}$ 5.6 and $PM_{2.5}$ with 4.8 times inhalation dose comparing with other modes of transportation. With regards to future studies, the amount of inhalation in each transportation means should be considered in risk assessments of PM.
Ferro-fluid의 흡착을 통한 paper actuator의 개발
김기수(Kisu Kim),황도연(Doyeon Hwang),고성영(Seong Young Ko),박종오(Jong-Oh Park),박석호(Sukho Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
As a demand of a microrobot in medical and defense fields, micro-actuators for the actuation of the microrobot have been actively studied. The miniaturization, controllability and robustness on environmental changes are vital factors in the development of the micro-actuator. In this study, we proposed a new paper actuator using ferro-fluid absorption. The paper actuator was fabricated by the absorption of nanoscale Fe particles on a paper membrane and it was strongly magnetized and responded by external magnetic field. First, we synthesized a ferro-fluid using FeCl2 and FeCl3, and the ferro-fluid was absorbed on various papers such as facial tissue, coffee filter, Whatman filter and Hanji. In addition, the adsorptions of the Fe particles on the various paper membranes were investigated by SEM images. Finally, we fabricated cantilever type actuators from the ferro-fluid absorbed papers and executed bending and alignment tests using an electromagnetic actuation system. Through the experiments, it was validated that Hanji based paper actuator has the good magnetization and shows the best actuation performances compared with other paper actuators.
Gibb's Reagent를 이용한 캡사이시노이드 간이 분석 방법
정희진(Hee-Jin Jeong),황도연(Doyeon Hwang),안정탁(Jeong Tak Ahn),천진영(Jin Young Chun),한고은(Koeun Han),이우문(Woo-Moon Lee),권진경(Jin-Kyung Kwon),이용직(Yong-Jik Lee),강병철(Byoung-Cheorl Kang) 한국원예학회 2012 원예과학기술지 Vol.30 No.3
캡사이신은 고추의 매운맛을 결정하는 화합물이며 HPLC 등과 같은 액상 크로마토그래피를 통한 정량법이 가장 많이 이용되고 있다. HPLC 방법은 정확하게 캡사이신 함량을 측정할 수 있으나 전처리 시간이 길고 고가의 장비를 필요로 하는 단점이 있다. Gibb's reagent로 불리는 2,6-dichloroquinone chlorimide는 캡사이신의 벤젠 구조와 반응하여 발색을 하며 이 반응을 이용해 상대적인 캡사이신의 양을 측정할 수 있다. 본 연구는 Gibb's reagent를 통한 발색반응은 캡사이신의 양에 비례하여 증가하며, 고추 태좌를 이용하였을 때에도 동일한 결과를 확인할 수 있었다. 또한, 이러한 방법을 대량 신속 캡사이신의 함량 측정을 위하여 고추의 과실을 절단하여 발색반응을 시키거나 Gibbs reagent를 미리 도포 시켜놓은 조건에서도 동일하게 신뢰할만한 결과를 확인하였다. 육종 목표에 따라 Gibb's reagent를 통한 개체 선별을 쉽게 하여 실제 육종 포장에서 간이적인 방법으로 매운 맛에 대해서 정성적 분석과 대략적인 정량적 분석이 가능하게 되었다. 이러한 방법은 기존의 액상 크로마토그래피 등의 방법에 비해 시간과 비용이 절약되며 정확성에서도 큰 차이를 보이지 않아 고추 육종 포장에서의 활용을 기대할 수 있다. Capsaicinoids are responsible for the pungency of Capsicum species. Among the several reported methods for quantifying capsaicinoids in pepper, liquid chromatography methods such as TLC and HPLC have been the most widely used due to their precision and reliability. However, they are quite expensive and time consuming to be applied to the field breeding. In this paper, we demonstrated that Gibb's reagent, 2,6-dichloroquinone chlorimide, mediated measurement of capsaicinoids is a simple and reliable method for determining the presence/absence of capsaicinoids, and estimating the amount of capsacinoids in pepper fruits. The capsaicinoids could be also detected via colorimetiric reactions of the Gibb's reagent. This simple method has been verified to be as accurate as the HPLC analysis. We have also modified this method for a high through-put analysis. This method will be useful for measuring capsaicinids in pungency breeding programs in pepper.