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주상시험장치를 이용한 해안 폐기물 매립장 지반토지 오염물 흡착능에 관한 연구
장연수,한성길,김수삼,Jang, Yeon-Su,Han, Seong-Gil,Kim, Su-Sam 한국지반공학회 1997 지반 : 한국지반공학회지 Vol.13 No.4
본 논문은 해안 매립장의 해성점토와 그 기반 풍화토가 갖는 침출수 중의 무기물, 중금속 및 유기물에 대한 오염물 이동성 저감능력을 실내 주상실험에 의하여 조사하였다. 그 결과 무기물 인 칼릅의 경우 해성점토층의 흡착능이 하부 풍화토에 비하여 큰 것으로 나타났으며 중금속인 납과 카드윰의 경우는 매립장 실제 배출 농도보다 큰 농도에서도 완전 흡착되는 것으로 나타났다. 유기성 폐기물에 대한 실험결과 그 흡착능이 무기물이나 중금속에 비하여는 떨어지나 침출수내의 난분해성 유기물질을 기반 점토 및 풍화토가 저감시킬 수 있는 것으로 나타났다. In this paper, the retardation capacity of marine clay and weathered soil of seashore waste landfill is analyzed by using a laboratory column apparatus for organic and inorganic components which can represent the components of the leachate of municipal waste landfill. The results show that sorption capacity marine clay for potassium is larger than that of weathered soil. Lead and cadmium are adsorbed completely at concentrations higher than the real concentrations developed in the landfill. The bottom soils of seashore landfill can also retard some nondegradable components of organics although their sorption capacities for organics were less than those for inorganics.
홍성민(Seong-Min Hong),박대훈(Dae-Hun Park),한성길(Sung-Gil Han),송철기(Chul-Ki Song) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.1
Recently, the manufacturing market for low-cost airlines has led to an increase in aircraft demand. Most processes in the production of these aircrafts are manual such as drilling, sealing, and swaging. A drilling and riveting machine is a numerical-control based equipment that automatically performs drilling, sealing, and swaging operations. The accuracy of the drilled holes and the exit burr length has a significant impact on the quality of the aircraft wing during assembly. This study was conducted to identify the conditions necessary to maintain a uniform quality by controlling the rotation speed of the spindle, which directly affects the hole diameter and the quality of the exit burr.
진동삼축시험을 통한 실트질 모래의 액상화 강도에 대한 연구
박종관,김상규,한성길,Park, Jong-Gwan,Kim, Sang-Gyu,Han, Seong-Gil 한국지반공학회 1998 지반 : 한국지반공학회지 Vol.14 No.1
국내 해안에 퇴적된 실트질 모래와 hydraulic fill한 지반에서 채취한 시료의 액상화 강도 측정을 위해 응력제어 진동삼축압축시험을 수행하였다. 이를 위해 1) 불교란시료와 교란시료의 액상화 강도 산정과 2) 등방 압밀된 시료와 비등방 압밀된 시료의 반복삼축시험결과 비교, 3) 본 시험결과와 국내 다른 시험자료 및 외국의 결과를 비교하였다. 등방 압밀 시료의 액상화 강도는 시료의 상대밀도에 따라 나타내었다. 실트질 함유량이 30%이하의 경우 액상화 강도는 실트질 영향을 거의 받지 않음이 나타났다. 비등방 압밀된 시료의 액상화 강도는 수직응력을 구속응력으로 나눈 유효압밀비에 영향을 받는다. 본 연구의 시험결과 한국 서해안의 실트질 모래의 액상화 강도는 Seed and Pea cock(1971)가 제안한 범위에서 내에 있음을 알 수 있다. Samples of silty sands and hydraulic fill ground were investigated by dynamic triaxial teats in order to evaluate the liquefaction strengths. In the tests, (1) undisturbed and disturbed samples were prepared, (2) dynamic shear strengths were measured under isotropic and anisotropic condition, and (3) the test results were compared with the other results which were tested by domestic and foreign researchers. The liquefaction shear strengths under ismtropic test condition were presented in terms of the relative densities. The amount of silt under 30o hardly influenced on the liquefaction strength. In the test results of anisotropically consolidated samples the liquefaction strength was dependent on the magnitude of the effective consolidation ratio. These teat results show that the liquefaction strength of the silty sand in Korea went coast exists within the boundary of the values suggested by Seed and Peacock(1971).
수치해석을 통한 건설중장비 유압시스템용 파이프설계에 대한 연구
신유인(Yoo In Shin),이중섭(Chung Seob Yi),한성길(Sung Gil Han),이호성(Ho Seong Lee) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.9
We herein propose a systematic design method of hydraulic pipes used in heavy construction equipment. We found that even though many design studies have been conducted regarding major hydraulic components such as pumps, cylinders, and control valves, studies regarding the optimal design of hydraulic pipes are scarce. In this study, the design of four types of pipes is considered: two high-pressure and two low-pressure pipes. First, fluid flow analysis was conducted based on oil flow and pressure for various radii of curvature. For a check-valve pipe, we considered the location of an inlet pipe. We could visualize fluid flow inside the pipe according to the flow velocity and pressure distribution. Based on fluid flow analysis, we conducted a structural analysis that revealed the stress distribution and concentration for each pipe design. We selected the best design parameters for each pipe design, fabricated the pipes, and subsequently tested them for validity.