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고성능 에너지 절약형 타이어 트레드 고무의 합성 제조 기술
임기원 ( Ki Won Lim ),지상철 ( Sang Chul Ji ),정권영 ( Kwon Young Jung ),김태중 ( Tae Jung Kim ),이범재 ( Bum Jae Lee ) 한국고무학회 2009 엘라스토머 및 콤포지트 Vol.44 No.3
근래 고성능 친환경 타이어의 개발요구에 의하여 경제성(낮은 회전 저항)과 안전성(wet traction) 및 내마모성 면에서 균형있는 특성을 가지는 타이어 트레드 고무의 합성 제조 기술이 중요하게 대두된다. 이를 위하여 다양한 기능성 용액중합 SBR의 개발과 함께 고무/충전제 간의 상호작용 증진 기술이 학술적으로나 산업적으로 활용되고 있다. 본 고에서는 기존의 카본블랙 고무와 함께 최근 green tire로서 각광 받는 실리카 충전 고무에서 충전제와 상호반응이 가능한 화학적 변성 SBR과 커플링제를 이용한 고성능 타이어 트레드 고무의 합성 제조 기술에 대하여 최근 연구 방향과 함께 작용 메카니즘에 대하여 고찰하였다. The specialized and diversified synthetic and compounding technologies are used to meet the requirements for the advanced high performance tire tread materials with better balance of fuel economy(rolling resistance), safety(wet traction) and wear resistance. These techniques involve the methodology for the improvement of chemical and physical interaction between filler and the rubber matrix using coupling agents as well as a variety of chemically-modified solution SBRs. The research trends about the high performance functional SBRs and coupling agents which can interact with the surface of fillers and their working mechanism were investigated in the conventional carbon black-filled rubber and silica-filled SBR systems developed recently as green tire.
전기적으로 큰 원통 도체 위에 장착된 역 F 안테나의 방사 패턴 분석
김태현,김성완,이재득,이범선,박동철,Kim Tae-Hyun,Kim Sung-Wan,Lee Jae-Deuk,Lee Bum-Sun,Park Dong-Chul 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.7
본 논문에서는 위성 발사체와 같이 전기적으로 큰 원통 도체 위에 전기적으로 작은 역 F 안테나들이 장착된 경우에 대해 방사 패턴을 실험적으로 고찰하였다. 먼저 모멘트 법(MOM: Method Of Moment)과 상용 툴(tool)인 HFSS(High Frequency Structure Simulator)를 이용하여 방사 패턴을 구하고 이의 결과를 실험 결과와 비교 분석하였다. 특히 원통 도체가 전기적으로 큰 경우 안테나 근방의 접지면 일부분만을 고려하여 원통 도체의 크기가 방사 패턴에. 미치는 영향을 고찰하였다. 다음 역 F 안테나가 원통 도체에 1개, 2개 장착된 경우에 대해 방사패턴을 모멘트 법, HFSS를 이용하여 구하고 고찰하였는데 이의 결과와 실험 결과가 서로 잘 일치함을 확인하였다. In this paper, radiation patterns of electrically small inverted-F antennas(IFAs) on an electrically large cylindrical conducting body like a satellite launcher are experimentally studied. First, radiation patterns are obtained by using method of moment and a commercial software tool, HFSS(High Frequency Structure Simulator) and the results are compared and analyzed with experimental ones. Especially, when the size of a cylindrical conducting body is electrically large, the effects of the size of a cylindrical conducting body on radiation patterns are studied by considering only the partial ground in vicinity of antennas. And then, when one and two inverted-F antennas are on the cylindrical conducting body, radiation patterns are simulated and investigated by using method of moment and HFSS. Good agreements are observed among the results by method of moment, HFSS, and experiments.
김상년 ( Sang Nyun Kim ),이동언 ( Dong Un Lee ),이범철 ( Bum Chul Lee ),박정배 ( Jung Bae Park ),신수정 ( Su Jeong Shin ) 대한외상학회 2012 大韓外傷學會誌 Vol.25 No.4
Purpose: Deep vein thrombosis and pulmonary thromboembolism are major causes of death after severe multiple trauma. Although various means of prevention have been presented and utilized, still, there are no standard guidelines for anticoagulation of multiple trauma because of some contraindications. Methods: A retrospective study of adult major trauma patients whose injury severity scores (ISSs) were over 16 and who had visited one university hospital in Daegu city was performed. We compared some features of patients diagnosed DVT or PTE with those of patients without DVT by computed tomography or ultra sonography. Those features included accompanying various kinds of intracranial hemorrhages, possibility of ambulation, emergent operation, early transfusion, and suspicious symptoms. Results: The mean age of the 58 subjects included in this study was 50.9±17.2 years, the mean ISS was 22.7±6.0, and the mean hospital stay was 55.2±37.9 days. Ten(17.2%) patients had emergent surgery, and 44(75.9%) experienced delayed surgery. Early transfusion was needed in 34(58.6%) patients. Among the 18 patients diagnosed with DVT, accompanying intracranial hemorrhages were noted in 8(44.4%) patients; one of the 8 also had PTE. Among the same 18 patients, early transfusions were required in 11(61.1%) patients; one of the 11 also had PTE. Conclusion: The risk of DVT is increased in cases of severe multiple trauma, and many difficulties in applying anticoagulants are experienced. Though we need additional studies to decide proper prophylaxis for DVT and PTE, if the patient`s general condition permits, a screening test for DVT as soon as possible could be an effective method to reduce the possibility of a bad outcome. (J Trauma Inj 2012;25:109-114)
이범철,유길상 한국고무학회 1997 엘라스토머 및 콤포지트 Vol.32 No.1
The change of elastic modulus(E'), loss modulus(E$quot;), and loss tangent(tanδ) were investigated on condition of double strain amplitude (DSA) at temperature of -40∼80℃for carbon black filled natural rubber. E', E$quot;, and tanδ were increased as it closed to the glass transition temperature due to decrease of rubber network flexibility and carbon black agglomerate interaction. In the micro strain range, energy loss showed maximum value because of the chain slippage in rubber matrix, but the regeneration of carbon black agglomerate and rubber matrix affected decrease of energy loss over the mid-range strain. As a results of regression analysis, E'_(max) correlation with ΔE' (E'_(0.4%DSA)-E' _(2.0%DSA)) showed linear relationship.
權純錫,李範澈,鄭漢植 東亞大學校 大學院 1988 大學院論文集 Vol.13 No.-
A numerical study have been performed onthe effects of spacers on the heat transfer across a horizontal annulus under basic conditions; Ra=10⁴,Pr=0.7 D??/D??=2.6, K??K=48, ??/D??=0.06 and Nu??=122.5. The mode of heat transfer in the annulus is changed from conduction to convection at Ra??10³. The maximum dimensionless temperature districution along (r-r??)/L at Θ=50?? are founded for vertical spacers but at Θ=120??, for horizontal spacers, and the minimum dimensionless temperature distribution along (r-r??)/L at Θ=50?? are founded for horizontal spacers but Θ=120??, for no spacers. The maximum dimensionless angular velocity at Θ=50??, at (r-r??)/L??0.2 near the inner tube and at(r-r??)/L??0.8 near the outer cylinder but at Θ=120??, it shows at (r-r??)L??0.15 near the inner tube and at (r-r??)L??0.7 for no spacers and vertical spacers and at (r-r??)/L??0.8 for horizontal spacers near the outer cylinder. Finally, the heat transfer by natural convection in the plain annulus is maximum but in the annulus with horizontal spacers in munimum.
隔板을 가진 水平環狀空間에서 自然對流에 관한 實驗的 硏究
鄭泰鉉,金善政,李範澈,權純錫 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2
Natural convection from a horizontal annulus with spacers has been studied on the effects of Rayleigh numbers and position of spacers by experimental method. In case of vertical spacers, the maximum local Nusselt number appears at θ=150° in a conducting tube and θ=30° in a cylinder. The local spacer Nusselt numbers show positive values on the lower spacer, but negative values on the upper spacer. In case of horizontal spacers, the flow over the spacer is more active than that of under the spacer as the Rayleigh number increase. The maximum local Nusselt number appears at θ=180° In a tube and at θ=0° in a cylinder. The local spacer Nusselt number show positive values on the upward surface of spacer, but negative values on the downward surface of spacer. The mean tube Nusselt numbers and mean cylinder Nusselt numbers with vertical spacer are increased 11% And 2.7%, respectively by those of horizontal spacer.
카본블랙의 충전량에 따른 NR/HNBR 블렌드의 물성과 가교밀도에 관한 연구
홍석표,최상구,이범철,유길상 한국고무학회 1992 엘라스토머 및 콤포지트 Vol.27 No.3
Compared with NR and HNBR compounds, the blend properties of NR/HNBR were studied. The heat, oil and ozone resistance of NR compounds were improved by blending HNBR, and these effects were more clearly revealed with elevating temperatures. For the overall stabilities of the compounds, it was resonable to use the carbon black under the 60phr. In the EV systems, high-saturated NR/HNBR and HNBR compounds showed similar total crosslink density in comparison with NR compounds. Interaction parameters calculated by stress-strain method showed widely varied value.