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조일형,조경덕,안상우,장순웅,김영규,Cho Il-Hyoung,Zoh Kyung-Duk,An Sang-Woo,Chang Soon-Woong,Kim Young-Kyu 한국환경보건학회 2006 한국환경보건학회지 Vol.32 No.1
This study was conducted to improve an effect of phosphorus removal using FNR(Ferrous Nutrient Removal) process which had iron precipitation reactor and to analyze the iron corrosion. For simultaneous removal of phosphorus, iron electrolysis was combined with oxic tank. In this study, The removal efficiency of phosphorus increased with an increase voltage in iron precipitation reactor. The distance of 15mm between the two iron bed in each tests influence the concentration of remaining phosphorus most. The extensive surface area of iron bed is the more removes the phosphorus. In this test the $400\;cm^2$ of surface area was proved to be the most removal efficient.
주성분분석을 이용한 환경영향평가와 사후환경조사의 비교 및 평가에 관한 사례연구
조일형,김용섭,조경덕,Cho Il-Hyoung,Kim Yong-Sup,Zoh Kyung-Duk 한국환경보건학회 2005 한국환경보건학회지 Vol.31 No.2
Environmental monitoring system has been adopted and supplemented as inspection measures for the quantitative and qualitative changes of environmental impact assessment (EIA). This study compares the results of environmental impact assessment with the results of post-environmental investigation using a correction and principal component analysis (PCA) in the housing development project. Correlation analysis showed that most of air quality variables including TSP, $PM_{10},\;NO_2$, CO were linearly correlated with each other in the environmental impact assessment and the post-environmental investigation. In the water quality, pH and BOD were well correlated with the DO and SS, respectively. As a result of correlation analysis in the noise and vibration, noise in day and night and vibration in day and night were related to each other between EIA and the post-environmental investigation. From the results of analysis of soil, Cu with Cd, Cu with Pb, and Cd with Pb were related to each other in EIA. Principal component analysis (PCA) showed a powerful pattern recognition that had attempted to explain the variance of a large dataset of inter-correlated variable with a smaller set of independent variables (principal components). Principal component (PC1) and principal component (PC2) were obtained with eigenvalues> 1 summing almost $90\%$ of the total variance in the all of the items(air, water, noise, vibration and soil) in EIA and post-environmental investigation.
태양광 / TiO2 시스템을 이용한 수중의 중금속 - EDTA 제거에 관한 연구
조일형(Il Hyoung Cho),김현용(Hyun Yong Kim),성기석(Gi Seok Sung),박경렬(Kyung Yeul Park),이홍근(Hong Keun Lee) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.1
The removal of heavy metal and EDTA was done by a solar photocatalytic oxidation and reduction. EDTA is industrial agent to form stable heavy metal-EDTA complex with toxic metals such as Cr(VI), Ni(II), Zn(II). Hg(II). Cu (II). Cd(II). In this experiment, comparison solar photolysis. TiO₂ adsorption, and solar/TiO₂ photocatalysis as well as the effect of reaction conditions such as solar light intensity, TiO₂ dosage and H₂O₂ concentration on the removal of heavy metal-EDTA were done in a tubular type reactor. The results of this study were as follows: 1) With both solar light and TiO₂ present, heavy metal-EDTA was more effectively removed than either solar light or TiO₂ alone. It was found that solar light application to the photocatalytic oxidation and reduction of heavy metal-EDTA was possible. 2) Photocatalytic removal efficiency of heavy metal-EDTA increased with solar light intensity. 3) Photocatalytic removal efficiency of heavy metal-EDTA increased with TiO₂ dosage. However, the efficiency approached to a saturation level over 1.5g/L of TiO₂ dosage. 4) Addition of H₂O₂ enhanced the efficiency of photocatalytic oxidation and reduction of the heavy metal-EDTA but the removal efficiency was similar or decreased over some level of H₂O₂ concentration.
조일형(Cho, Il-Hyoung) 한국해안해양공학회 2011 한국해안해양공학회 논문집 Vol.23 No.1
본 연구에서는 일정한 공극율을 갖는 투과성 그물망으로 이루어진 원통형 양식시설물에 작용하는 파랑하중을 고유함수전개법을 사용하여 해석하였다. 그물망에서의 경계조건식으로 그물망을 통과하는 속도값은 그물망 전후의 압력차에 선형적으로 비례한다는 Darcy의 법칙을 적용하였다. 그물망의 공극율 계수와 양식시설물의 잠긴 위치(부상식, 착저식)를 변화시키면서 양식시설물에 작용하는 파랑하중과 파도응답을 살펴보았다. 착저식 양식시설물에 작용하는 파랑하중이 부상식과 비교하여 크게 감소하며, 그물망의 공극율이 양식시설물의 파랑하중과 양식시설물 주변의 파형을 줄이는데 중요한 역할을 함을 밝혔다. In this paper, the wave forces on a cylindrical aquaculture fish cage, which consists of the porous mesh with the uniform porosity, are analyzed using matched eigenfunction expansion method. The boundary condition on the porous net is derived based on the Darcy's law, which implies that the velocity of the fluid passing through the net is linearly proportional to the pressure difference between two sides of the net. The wave forces and wave responses are investigated by changing the porous parameter of porous net as well as the submerged position (floating type, bottom-mounted type) of an aquaculture fish cage. It is found that the wave forces on a bottom-mounted type are largely decreased compared with that on a floating type. Also, the porosity of the netting structure plays an important role in reducing the wave forces and the wave elevation in the vicinity of an aquaculture fish cage.
안벽 앞에 설치된 진동수주형 파력발전장치의 반사율과 추출효율과의 상관관계
조일형(Il Hyoung Cho),김정록(Jeongrok Kim) 한국해안해양공학회 2020 한국해안해양공학회 논문집 Vol.32 No.4
본 연구에서는 직립 안벽 앞에 설치된 2차원 진동수주형 파력발전장치의 추출효율과 반사율을 규칙파와 불규칙파에 대하여 살펴보고 둘 사이의 상관관계를 조사하였다. 해석이론으로 선형포텐셜 이론에 기반을 둔 고유함수 전개법을 사용하였다. 공기실이 완전 개방되었을 때 입사파에 의한 산란문제와 공기실이 닫혀 있을 때 공기실내의 변동압력에 의한 파의 방사문제를 풀어 공기실 내부의 유량을 구하고, 이를 공기실내의 공기 흐름에 대한 연속방정식에 대입하여 변동압력을 구한다. 추출파워가 최대가 되는 최적 터빈계수를 적용하여 진동수주형 파력발전장치의 최대 추출효율과 반사율을 규칙파와 불규칙파에 대하여 구하였다. 파랑에너지를 효율적으로 흡수하도록 설계된 진동수주형 파력발전장치는 동시에 반사파를 줄이는데 기여하였다. In this study, the extraction efficiency and reflection coefficient by a two-dimensional OWC (Oscillating Water Column) WEC (wave energy converter) installed in front of a seawall was investigated for regular/irregular waves. The matched eigenfunction expansion method (MEEM) based on the linear potential theory was applied as an analytical tool. The diffraction problem by the incident wave in the open-chamber and the radiation problem by the oscillating pressure in the closed-chamber were solved to obtain the volume fluxes at the internal free-surface. Applying the volume fluxes into the continuity equation for the airflow in a chamber, we got the oscillating air pressure. The maximum extracted power and corresponding reflection coefficient were determined at the optimal turbine coefficient that maximizes the extracted power. OWC device designed for a high extracted efficiency simultaneously contributes to reduce reflected waves.
규칙파중 시간영역 스트립이론을 이용한 비선형 유탄성 해석
조일형(IL-HYOUNG CHO),한성곤(SUNG-KON HAN),권승민(SEUNG-MIN KWON) 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.4
A nonlinear time-domain strip theory for vertical wave loads and ship responses is to be investigated. The hydrodynamic memory effect is approximated by a higher order differential equation without convolution. The ship is modeled as a non-uniform Timoshenko beam. Numerical calculations are presented for the S175 Containership translating with the forward speed in regular waves. The approach described in this paper can be used in evaluating ship motions and wave loads in extreme wave conditions and validating nonlinear phenomena in ship design.
조일형(IL-HYOUNG CHO) 한국해양공학회 2004 韓國海洋工學會誌 Vol.18 No.5
The interaction of incident monochromatic waves with an array of N surface-piercing porous dual cylindrical structures is investigated in the frame of three-dimensional linear potential theory. The dual cylindrical structure is composed of concentric two cylinders. The exterior cylinder is porous and the interior cylinder is impermeable. The fluid domain is divided into N+1 regions i.e. a single exterior region and N interior regions. The diffraction potentials in each region representing the scattering of incident waves by an array of porous cylindrical structures are expressed by the Fourier Bessel series. The unknown coefficients in each region are determined by applying the porous boundary condition and continuity of mass flux at the matching boundary. It is found that an array of porous cylindrical structures reduces both the wave forces and the wave run-up, and shows the excellent performance of wave blocking. The results show that various types of breakwater exchanging seawater are prospective by controlling the porosity and the configuration of cylindrical structures.