• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 춘계 학술발표회
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• pp.265-277
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• 2009

A long-term field demonstration experiment of selected stabilization method to reduce the heavy metal mobility in farmland soil contaminated by heavy metals around abandoned mine site was conducted. Field demonstration experiments were established on the contaminated farmland with the wooden plate(thickness=1cm) which dimension were width=200cm, Length=200cm, height=80cm and filled with treated soil, which was mixed with lime stone and steel refining slag except on control plot. Soil samples were collected and analyzed during the experiment period(2008. 2~2008. 8) after the installation of the plots. Field demonstration experiments results showed that the application ratio of lime stone 5% was effective for immobilizing heavy metal components in contaminated farmland soil.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 춘계 학술발표회
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• pp.984-999
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• 2010

A long-term field demonstration experiment of selected stabilization method to reduce the heavy metal mobility in farmland soil contaminated by heavy metals around abandoned mine site was conducted. Field demonstration experiments were established on the contaminated farmland with the wooden plate(thickness=1cm) which dimension were width=200cm, Length=200cm, height=80cm and filled with treated soil, which was mixed with lime stone and steel refining slag except on control plot. Soil samples in the plots were collected and analyzed during the experiment period(2008. 2~2008. 8) after the installation of the plots. Field demonstration experiments results showed that the application ratio of lime stone 5% was effective for immobilizing heavy metal components in contaminated farmland soil.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.1487-1506
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• 2009

A long-term field experiment of the selected stabilization methods(Cover system, full range and upper range treatment) was conducted to reduce the heavy metal mobility in farmland soil which was contaminated by heavy metals around abandoned mine site. Field experiments were established on the contaminated farmland with the wooden plate and filled with treated soil, which was mixed with lime stone and steel reforming slag except on control plot. Soil samples were collected and analyzed during the experiment period(about 4 months) after the installation of the plots. Field demonstration experiments results showed that the cover system and the full range treatment of the selected stabilization methods applied to the application ratio of lime stone 5% and steel refining slag 2% were effective for immobilizing heavy metal components in contaminated farmland soil.

• 한국지반공학회논문집
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• 제26권7호
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• pp.59-70
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• 2010

대상지역 내 중금속 오염농경지 복원을 위해 설계된 안정화 공법에 대한 현장 적용성을 검토하기 위해 현장실증시험을 수행하였다. 대상오염 농경지에 처리구들을 설치하여 오염토양만을 채운 무처리구를 제외한 각 처리구에 중금속 안정화 재료로 선정된 석회석과 산업부산물인 제강슬래그를 각각의 혼합비로 채운 후, 관측기간동안 처리구 내 토양을 채취하여 이화학특성, 중금속농도(Cu, Cd, Pb, Zn, As) 그리고 중금속 분획특성 등을 분석하여 그 특성을 비교하였으며, 그 결과를 수록하였다.

• Current Optics and Photonics
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• 제3권3호
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• pp.227-235
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• 2019

With slimmer, lighter and all-reflective imaging systems in high demand for consumer and military applications, coaxially folded optical image systems are widely considered because they can extend focal length and reduce track length. Most of these systems consist of multiple surfaces, and these surfaces are machined on one element or grouping processing on two elements. In this paper, we report and first experimentally demonstrate an all-aluminum all-reflective optical system which consists of two optical elements, with two high order aspherical surfaces in each element. The coaxially folded system is designed with Seidel aberration theory and advanced optimization with Zemax. The system is made of all-aluminum material processing by single point diamond turning (SPDT). On this basis, we completed the system integration and performed an imaging experiment. The final system has the advantages of short track length and long focal length and broad application prospects in the micro-unmanned aerial vehicle field.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2009년도 추계학술대회 논문집
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• pp.110-112
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• 2009

Transient acoustic pressure in the near field of an impacted plate carries information that can be utilized for recovering the impact force history. The inverse calculation approach using BEM-based NAH, which is conventionally used for time harmonic excitation, can be applied for reconstructing the transient waves using the principle of Fourier transform and spectral analysis. Then, using the recovered velocity in normal direction of the plate surface, the corresponding structural intensity can be obtained and the identification of input power can be performed. However, several manipulations should be given to overcome numerical artifacts, such as aliasing and erratic oscillation at discontinuity, and to suppress the effect of noise. Experiment using a simply supported plate is presented for demonstration purpose.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회
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• pp.1201-1212
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• 2010

In order to investigate on the effect of stabilization methods for rice paddies contaminated by heavy metals, a series of lab-scale model test was carried out by applying the characteristics of submerged Paddy soil. To perform the lab-scale model test, columns were made by acrylic with the dimension of diameter=10cm, thickness=0.5cm and were filled with soils which was contaminated were mixed with stabilization agents(lime stone 5% and steel refining slag 5% respectively). To manipulate the reduction condition, soils in the columns were submerged with distilled water. And then soil water and subsurface water in each column were sampled in the regular term and analysed the various physical and chemical properties.

• 농촌지도와개발
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• 제21권1호
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• pp.219-244
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• 2014

에티오피아의 농촌지도사업은 다른 아프리카 국가들과 비교하여 긴 역사를 가지고 있으며 다양한 접근방법과 모델을 통하여 이루어져 왔다. 오랜 역사에도 불구하고, 농촌지도사업 시슨템은 사업영역, 커뮤니케이션, 제도적인 다원성 측면에서 초보단계에 머물고 있다. 농촌지도사업의 초점은 시험연구사업 결과에 대한 기술이전, 국가식량안보와 수출증가를 위한 농업생산성 증대에 있다. 최근 농촌지도사업 시스템에 대하여 많은 논의가 이루어지고 있으며, 다른 관점을 통하여 보다 지도사업 시스템이 엄밀성을 더해 가고 있다. 최근 에티오피아 농촌지도사업은 공공부문에 의하여 추진되고 있으며, 특히 district 단위에서 분권화된 방법으로 운영되고 있다. 그리고 제한된 수준이지만 NGO에 의하여 수행되고 있다. 에티오피아의 농촌지도사업은 1950년대에 연구개발 및 기술이전, 외국의 새로운 기술도입을 위하여 시작되었다. 초기에 농촌지도사업은 시험장 위주로 이루어졌다. 이후에 에티오피아 농촌지도사업은 다섯 가지 단계로 추진되었다. 대학학장시스템(the land grant extension system), 패키지 프로그램, 최소 팩키지 프로젝트, 농민 농업개발 프로그램, 참여민주주의와 훈련시스템(PADETS). 패키지 지도사업 프로그램은 시범지역에 최초로 수행되었으며, 15-20년내에 농촌지역의 90%까지 확대되었다. 이 프로그램은 개발기구에 의하여 관리되는 시범포를 사용하였으며, 조직화된 농민들을 훈련하였다. 그러나, 이 프로그램이 특정한 조그마한 지역에서 운영되어 다른 지역까지 확대되지 못하였다. 참여민주주의와 훈련시스템을 통하여 에티오피아의 농촌지도사업은 주목을 받게 되었으며 많은 논의가 있었으며, 외부의 관점들이 더 정교하게 만들었다. 긴 역사에도 불구하고, 이 시스템은 커뮤니케이션, 제도적인 다원주의적인 측면, 분권화 측면에서 걸음마 단계이다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2002년도 추계공동학술대회논문집
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• pp.1-6
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• 2002

수색구조 작업에서 표류지점 추정 모델을 윈도우 운영체계에서 쉽게 운영할 수 있는 GUI 프로그램을 개발하였다. 운영자가 화면의 선택사항을 보고 표류물체의 종류와 해상환경조건을 입력시킬 수 있도록 하였고, 계산된 추정점 및 선박의 표류 궤적이 좌표와 함께 해도상에 표시되게 하여 현장에서 쉽게 예측결과를 알 수 있도록 하였다. 프로그램에는 Leeway 공식을 사용하는 방식과 Newton의 운동방정식에서 해를 구하는 방식을 사용하였다. 프로그래밍에 사용된 언어는 FORTRAN이고, 그래픽 처리를 위해 Lahey의 Winteracter 4.0을 활용하였다. 모델의 시현을 위해 2001년 5원 부산 근해에서 수행된 현장실험 결과와 예측 모델에 의한 결과를 비교·도시하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.1455-1471
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• 2009

In order to investigate on the effect of stabilization methods for rice paddies contaminated by heavy metals, a series of lab-scale model test was carried out by applying the characteristics of submerged Paddy soil. To perform the lab-scale model test, columns were made by acrylic with the dimension of diameter=10cm, thickness=0.5cm and were filled with soils which was contaminated were mixed with stabilization agents(lime stone 5% and steel refining slag 5% respectively). To manipulate the reduction condition, soils in the columns were submerged with distilled water. And then soil water and subsurface water in each column were sampled in the regular term and analysed the various physical and chemical properties.