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강인식,곽기석,김도삼,양윤모,Kang, I. S.,Kwak, K. S.,Kim, D. S.,Yang, Y. M. 한국항해항만학회 1994 韓國港灣學會誌 Vol.8 No.2
A theoretical formulation is performed to investigate the wave reflection and transmission ratios by a submerged multi-layered rubble-mound breakwater. This theory, which is based on the linear boundary integral method, can be extended to the multi-layered breakwater with arbitrary cross section. In the theoretical analysis evanescent mode wave is not considered, since fictitious open boundaries are put on the places far from the structure. Therefore the mathematical presentation may be simpler, and computational time shorter. The validity of obtained numerical results is demonstrated by comparing with ones of impermeable and permeable breakwaters. Comparison shows resonable agreement. On the basis of these verifications this theory is applied to the one and two-layered submerged rubble-mound breakwater with trapezoidal type.
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김원규,강인식,곽기석,김도삼,Kim, W. K.,Kang, I. S.,Kwak, K. S.,Kim, D. S. 한국항해항만학회 1994 韓國港灣學會誌 Vol.8 No.1
The present paper discusses the nonlinear wave deformation due to a submerged coastal structure. Theory is based on the frequency-domain method using the third order perturbation and boundary integral method. Theoretical development to the second order perturbation and boundary integral method. Theoretical development to the second order Stokes wave for a bottom-seated submerged breakwater to the sea floor is newly expanded to the third order for a submerged coastal structure shown in Figure 1. Validity is demonstrated by comparing numerical results with the experimental ones of a rectangular air chamber structure, which has the same dimensions as that of this study. Nonlinear waves become larger and larger with wave propagation above the crown of the structure, and are transmitted to the onshore side of the structure. These characteristics are shown greatly as the increment of Ursell number on the structure. The total water profile depends largely on the phase lag among the first, second and third order component waves.
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소형 트럭용 글로우 플러그 보조 직분식 메탄올 엔진 개발
유철호(C.H. Yu),이종순(J.C.Lee),신동현(D.H.Shin),노석홍(S.H.Noh),강인식(I.S.Kang) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
NOx and Particulates from Diesel engines are the main causes of air pollution in city areas. However. the reduction of both NOx and Particulates simultaneously is not easily realized.<br/> Vehicles powered by Diesel-type Methanol engine are under development to reduce emissions and are under fleet test.<br/> Physical and chemical properties of Methanol are compared to use Methanol as a fuel in a Diesel-type engine. Ignition assistance systems in Diesel-type Methanol engine are also compared because ignition assistance system is needed due to poor self-ignition property of Methanol.<br/> The way to solve technical problems of Diesel-type Methanol engines are presented as follows; stable self-ignition property under wide operating conditions. combustion improvement, reduction of power consumption and reliability for glow plug by reservoir<br/> -type glow plug and by EGR at low load. combustion improvement and elevation of conversion rate of catalyst by throttling at no load, reduction methed of formaldehyde emission.<br/>
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