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문형일(Hyung-il Moon),김동수(Dong Soo Kim),김헌영(Heon Young Kim),김용수(Yong Soo Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Crumple zone is energy absorbing structure when car come into collision with pedestrian, and it is very important to reduce injury of pedestrian. Currently, pedestrian"s leg injury is increasingly caused by the car accident. Therefore research is need to reduce pedestrian"s injury applied to structure which is collision energy absorbing material. In this paper, we suggest modeling method of crumple zone expected to apply front end module using spring element. Also, we determine stiffness of crumple zone through collision analysis using Upper Legform Impactor, and performed estimation of collision characteristic according to shape of crumple zone and energy absorbing material.
심금 종류에 따른 자동차용 도어 웨더스트립의 유한요소 모델링
문형일(Hyung-il Moon),주현승(Hyun-seung Joo),김도형(Do-hyung Kim),김헌영(Heon-young Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Weatherstrips protect noise, dust, rain and wind out of the automobiles. There are various section shapes acoording to the usage. Most of computer simulation about the deformation of weatherstrip part has been conducted by using implicit code. But the analyses are restricted to simple shaped or 2 dimensional cross section of weatherstrip. In the case that the model is too huge and time complicated explicit code is much more effective in the aspect of accuracy and computational effort. Four types of finite element model are proposed in this study. In addition to, the reaction force and deformation patterns are compared between the simulation and the experiment.
ZnO 나노휘스커 소재를 이용한 MEMS가스센서의 소비전력과 메탄 감응 특성 연구
문형신 ( Hyung Shin Moon ),박성현 ( Sung Hyun Park ),김성은 ( Sung Eun Kim ),유윤식 ( Yun Sik Yu ) 한국센서학회 2010 센서학회지 Vol.19 No.6
A low power gas sensor with microheater was fabricated by MEMS technology. In order to heat up the gas sensing material to a operating temperature, a platinum(Pt) micro heater was built on to the micromachined Si substrate. The width and gap of micro heater were 20 μm and 4.5 μm, respectively. ZnO nanowhisker arrays were fabricated on a sensor device by hydrothermal method. The sensor device was deposited with ZnO seeds using PLD systems. A 200 ml aqueous solution of 0.1 mol zinc nitrate hexahydrate, 0.1 mol hexamethylenetetramine, and 0.02 mol polyethylenimine was used for growthing ZnO nanowhiskers. The power consumption to heat up the gas sensor to a operating temperature was measured and temperature distribution of sensor was analyzed by a Infrared Thermal Camera. The optimum temperature for highest sensitivity was found to be 250℃ although relatively high(64 %) sensitivity was obtained even at as low as J 50℃. The power consumption was 72 In W at 250℃ and was only 25 In W at 150℃.
자감초탕(炙甘草湯)이 재관류장치하에서 흰쥐의 적출심장(摘出心臟)에 미치는 영향(影響)
문형권,문상관,고창남,조기호,김영석,배형섭,이경섭,Moon, Hyung-Kun,Moon, Sang-Kwan,Ko, Chang-Nam,Cho, Ki-Ho,Kim, Young-Suk,Bae, Hyung-Sup,Lee, Kyung-Sup 대한한의학회 1997 대한한의학회지 Vol.18 No.2
Background : The stenosis of the coronary artery results in a decrease in the myocardial oxygen supply, ischemia and infarction. Jakamchotang as a drug of liquid is generally regarded to have the effect of arrythmia, palpitation from Heart disease and promoting the flow of Ki and Blood. Methods : The purpose of this experimental study is to find whether Jakamchotang is effective or not in curing ischemia in isolated perfused rat hearts and to measure the degree of its curing effect. In this study, under the Langendorff apparatus, ischemia was induced in isolated Sprague-Dawley rat hearts by ceasing the perfusion for 20 minites. Subjects were divided into a normal saline orally administered group(control group), an Jakamchotang orally 100mg administered group (sample A), an Jakamchotang orally 300mg administered group (sample B), and an Jakamchotang injection perfused group(sample C). The heart rates, left ventricular pressure, myocardial dilatation/contraction, cardiac perfusion flow and cardiac ezyme(LDH, CPK) of the four group were measured and compared in order to assess the influence of Jakamchotang on isolated perfused rat hearts recovering abillity from ischemia and infarction. results : 1. Heart rates were increased significantly in Jakamchotang orally 100mg administered group, Jakamchotang orally 300mg administered group and Jakamchotang injection perfused group on perfusion and reperfusion(p<0.01). 2. Left ventricular pressure were increased significantly in Jakamchotang orally 100mg administered group and 300mg administered and Jakamchotang injection perfused group(p<0.01) in comparison with control group on perfusion, but every group did not significant on reperfusion. 3. While there were no differances in each group's abillities of myocardial dilatation, the ability of myocardial constriction of Jakamchotang 100mg administered group only on perfusion was significantly greater than that of control group(p<0.05). 4. CBF was no significant on perfusion and reperfusion in comparison with control group(N.S.) 5. LDH was not significantly decreased on perfusion, but significactly decreased in Jakamchotang orally 100mg administered group, Jakamchotang orally 300mg administered group on reperfusion. 6. CPK was significantly decreased in Jakamchotang orally 100mg administered group, 300mg administered and Jakamchotang injection perfused group on perfusion(p<0.01), but was not significantly in Jakamchotang 300mg administered group only on reperfusion(P<0.05) Conclusion : According to the result above, Jakamchotang have an effect to recover in the isolated perfused rat hearts. Especially, the effect of Jakamchotang in orally adminstered group is greater than that of Jakamchotang injection perfused group on preischemia. The followings are the two important results of this study: First, the effect of Jakamchotang used traditionally on heart disease was proved statistcally under the Langendorff apparatus. Second, on the basis of this study, the effect of other type medications on myocardial ischemia can be evaluted in further studies.
문형일(Hyung-il Moon),전영은(Young-eun Jeon),김헌영(Heon Young Kim),김용수(Yong Soo Kim),길혁문(Hyuck Moon Gil) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently, enhancement of pedestrian safety becomes essential in vehicle design. The related studies on pedestrian protection have been established by the EEVC WG10(17) and IHRA. Information of safety evaluation is now opened to consumers leading to a demand of a development for pedestrian safety vehicle of automotive companies in Europe, Australia and Japan. Currently, researches have been conducted to establish the Global Technical Regulation (GTR) in which Korea also takes part. These efforts include applying the traffic conditions, accident rate and so on. Accordingly, pedestrian safety evaluation can be classified into 5 GTR types. In this paper, we suggest a crumple zone design to improve of the upper legform to bonnet leading impact test. Also, we use the impact analysis for design the rib structure using plastic material between the upper frame of the Front End Module and hood. A damage model was used to express the failure characteristic of plastics material. The reliability of impact analysis results is evaluated by comparing the analysis results with the test ones.
증례 : 내분비-대사 ; 기능성 재발을 보인 알도스테론 분비성 부신피질암 1예
문형일 ( Hyung Il Moon ),김지은 ( Ji Eun Kim ),이성수 ( Seong Su Lee ),진종률 ( Jong Youl Jin ),박일영 ( Il Young Park ),강성구 ( Sung Koo Kang ),유순집 ( Soon Jib Yoo ) 대한내과학회 2009 대한내과학회지 Vol.77 No.5S
알도스테론 분비성 부신피질암은 1955년 이후 현재까지 60여 명 보고된 매우 드문 암이다. 현재까지의 보고에 의하면 치료하지 않은 경우 평균생존율이 3개월이며 임상경과 중 전이가 흔하게 보고되어 예후가 불량한 암이다. 저자들은 반복되는 재발과 전이를 보이는 알도스테론 분비성 부신피질암 1예를 경험하였다. 내원 10개월 전 타병원에서 복강경하 알도스테론 분비성 부신피질암을 수술받은 27세 여성이 조절되지 않는 고혈압을 주소로 내원하였다. 이에 알도스테론 분비성 부신피질암의 기능성 재발로 진단하고 개복수술과 항암치료를 시행하였으며 이후에도 전이성 병변을 보여, 재수술과 방사선 치료를 시행하였다. 부신피질암의 가장 효과적인 치료는 근치적 절제이며 이것이 예후에 가장 중요한 인자이다. 이는 절제가능한 병변뿐만 아니라 재발 또는 전이성 병변에 있어서도 완전절제가 예후에 중요하다. 저자들은 젊은 환자에서 고혈압 진단에 있어서 반드시 2차성 고혈압의 진단을 유념해야 하고, 드물지만 악성 부신피질암의 가능성을 염두에 두고 이에 대한 정확한 진단과 적극적인 치료의 중요성을 강조하기 위하여 본 증례를 보고하는 바이다. Aldosterone-producing adrenocortical carcinoma (APAC) is an extremely rare disease. Recently, we experienced a case of recurrent and metastatic APAC: 10 months ago a 27-year-old female was admitted for uncontrolled hypertension after laparoscopic right adrenalectomy due to APAC. A radical operation and chemotherapy had previously been performed based on the diagnosis of APAC with functional recurrence. One-year later, metastasis to the right psoas muscle occurred, which required extensive excision and radiation therapy. Radical surgery is the only curative approach for APAC and is recommended for all patients with resectable tumors, even those with recurrent disease. Here we report a case of functional APAC (aldosterone-producing) that presented with recurrence and metastasis. (Korean J Med 77:S1206-S1211, 2009)
문형일(Hyung-il Moon),김헌영(Heon Young Kim),김민건(Min Gun Kim),김호(Ho Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-2
일반적인 고무 부품의 해석적 피로 수명 예측은 다양한 피로시험 결과를 바탕으로 정의되는 피로수명식이 사용된다. 그러나, 이와 같은 방식은 피로 시험에 사용되는 비용적, 시간적인 문제로 인해 설계과정에서 매우 제한적으로 사용된다. 더욱이, 고무재료의 비규격화 및 임의적인 특성변화가 피로시험 결과의 데이터베이스화를 어렵게 만든다. 본 논문에서는 찢김에너지를 이용한 또다른 피로수명 예측 방식을 제안하였다. 자동차용 방진고무들에 대한 동적, 정적 찢김시험 및 복잡한 형상을 갖는 고무 부품의 찢김에너지를 계산하기 위하여 가상 결함을 고려한 유한요소 정식화를 수행하였다. 제안된 방법을 사용하여, 자동차용 모터 마운트의 피로 수명을 예측해 보았고, 실제 수명과 예측된 수명을 비교하여 신뢰성을 검증해 보았다. A commonly analytical estimation of fatigue life on rubber components is using fatigue life equation based on various fatigue test results. However, such method has very restricted applicability in actual designing processes because performing fatigue tests requires a lot of time and money. In addition, non-standard rubber materials and their randomness make it hard to make databases. In this paper, the other fatigue life estimation method using tearing energy was suggested. We performed static and dynamic tearing test about automotive vibration rubber materials and a finite element formulation using a virtual crack to calculate the tearing energy of rubber components whit complicated shapes. To using the suggested method, fatigue life of an automotive motor mount has been estimated and verified the reliability of this method by using comparison between the estimated values ad the actual fatigue life.