• Microbiology and Biotechnology Letters
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• v.35 no.4
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• pp.261-271
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• 2007

Phytoremediation is an economic and environmentally friendly technique to remediate contaminated-soil. In this study, the effects of plants, rhizobacteria and physicochemical factors on phytoremediation have been reviewed. For successful phytoremediation, the selection of plants is primarily important. To remediate soil contaminated with petroleum hydrocarbon, raygrass (Lolium multiflorum lam), white mustard, vetch (Vicia villosa), tall fescue (Festuca arundinacea), legumes, poplar, and Pine (Pinus densiflora) were mainly applied, and the removal efficiency of petroleum hydrocarbon were ranged 68 to 99%. Corn (Zea mays), raygrass (Lolium multiflorum lam), vetch (Vicia villosa), mustard, clover (Trifolium repens), and tall fescue (Festuca arundinacea) were used for the removal of polycyclic aromatic hydrocarbon, and their removal efficiencies were 50-98%. Rhizobacteria play significant roles for phytoremediation because they can directly participate in the degradation of contaminant as well as promoting plants growth. The following rhizobacteria were preferred for phytoremediation: Azospirillum lipoferum, Enterobactor cloacae, Azospirillum brasilense, Pseudomonas putida, Burkholderia xenovorans, Comamonas testosterone, Pseudomonas gladioli, Azotobacter chroococcum, Bacillus megaterium, and Bacillus subtilis. Pysicochemical factors such as pH, temperature, nutrient, electron acceptor, water content, organic content, type of contaminants are consequential limiting factors for phytoremediation.

• Journal of the Korean GEO-environmental Society
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• v.9 no.2
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• pp.39-46
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• 2008

Due to the growth in industrialization, potential hazards in subsurface environments are becoming increasingly significant. The extraction of the contaminant from the soil and movement of the water are restricted due to the low permeability and adsorption characteristics of the reclaimed soils. There are a number of approaches to in-situ remediation that are used in contaminated sites for removing contaminants. These include soil flushing, dual phase extraction, and soil vapor extraction. Among these techniques, soil flushing was the focus of the investigation in this paper. Incorporated technique with PVDs has been used for dewatering from fine-grained soils for the purpose of ground improvement by means of prefabricated vertical drain systems. The laboratory model tests were performed by using the flushing tracer solutions for silty soils and recorded the tracer concentration changes with the elapsed time and flow rates. The modeling was intended to predict the effectiveness and time dependence of the remediation process. Modeling has been performed on the extraction, considering tracer concentration and laboratory model test characteristics. The computer model used herein are SEEP/W and CTRAN/W, this 2-D finite element program allows for modeling to determine hydraulic head and pore water pressure distribution, efficiency of remediation for the subsurface environment. It is concluded that the coefficient of permeability of contaminated soil is related with vertical velocity and extracted flow rate. The vertical velocity and extracted flow rate have an effect on dispersivity and finally are played an important role in-situ soil remediation.

• Journal of the Korean Geosynthetics Society
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• v.10 no.1
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• pp.29-36
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• 2011

The remediation efficiency of the contaminant through laboratory experiment of the pilot scale was evaluated for the influence factors in the contaminated soils for the applicability of the prefabricated vertical drain system. It was performed numerical analysis by the method that the finite element and finite differences based on the drawn result about the remediation of contaminated soils. The parametric analysis for the applied parameter value was performed. In the pilot scale remediation experiment, as a result of evaluating with the minimum limit concentration ratio, in the case of dense and loose conditon, the remediation time was much longer. And the remediation efficiency was rapidly progressed as the time was elapsed. It was analyzed that the contaminant concentration is reduced around the extraction well as the contamination remediating rate by numerical analysis result as the time was elapsed.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.28 no.9
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• pp.723-732
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• 2017

Simplified factorizing-technique to improve the efficiency on computational procedure and the complexity of the conventional back-projection algorithm, which is used to reconstruct airborne FMCW-SAR image, is suggested, and the reconstruction process of SAR image by this simplified factorizing-technique are presented in this paper. This technique can be efficiently applied to airborne FMCW-SAR having a relatively narrow beamwidth and long synthetic aperture length, and its basic rationale is to exclude the data that has low level of contribution during computational procedure. Using the raw data of practical airborne FMCW-SAR system, performances of this proposed technique such as SAR image quality and processing time were compared and analyzed.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10b
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• pp.644-646
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• 1999

본 논문은 한 물체에 대해 스캔 위치 정보가 없는 여러 시점의 레인지 이미지들로부터 3차원 형상 복원을 위한 정합 알고리즘을 제안한다. 기존의 정합 방법은 스캔 위치 정보와 기하학 정보를 이용하여 레인지 이미지들을 정렬시킨 반면, 본 논문의 정합 방법은 스캔 위치와는 독립적으로 수행되며 기하학 정보와 텍스쳐 정보를 함께 이용하여 정렬시킨다. 그러므로 텍스쳐가 있는 여러 장의 레인지 이미지들로부터 3차원 형상을 보다 정확하고 효율적으로 복원할 수 있다.

• Proceedings of the Korea Multimedia Society Conference
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• 2001.11a
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• pp.1-5
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• 2001

네트워크를 통한 영상 데이터 전송 시 에러가 발생하면 복원 영상의 화질 열화는 매우 심각하다. 따라서, 에러 영상을 복원하기 위한 에러 은닉 기술은 복호기 쪽에 매우 중요하다. 본 논문에서는 매크로블록이 움직임 벡터와 함께 손상이 되었을 때 주변 매크로블록의 움직임 벡터를 이용한 빠르고 효율적인 에러 은닉 기법을 제안한다. 실험 결과 에러 은닉 기법을 제안한다. 실험 결과 에러 블록 주변의 경계화소를 이용한 기존의 방법과 비교하여 거의 동등한 복원 화질을 얻으면서도 에러 은닉을 위한 처리 시간을 획기적으로 단축하였다.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1997.05a
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• pp.120-123
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• 1997

오염토양 복원의 신기술로서 미생물계면활성제를 이용한 생물학적 정화법(Bioremediation)의 표준화된 절차와 현장적용 결과를 제시하였다. 적절한 양분과 수분 그리고 산소를 공급하여 유류 오염물질의 생물학적 제거효율을 극대화시킬 수 있었으며 특히 유류오염물질을 효과적으로 분산시키기 위해 미생물계면활성제를 사용함으로써 오염된 토양을 단기간 내에 복원하는데 상당히 효과적인 기술임을 확인 할 수 있었으며 지속적인 현장적용 기술의 개발을 통하여 국내외적으로 당면하고 있는 토양오염문제를 해결하는데 크게 이바지 할 수 있을 것으로 사료된다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.6
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• pp.980-985
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• 2002

In this paper, we analyzed satellite image with a high resolution compression performance. We need much time in a fast processing on vast satellite image pixel data. On compressing and decompressing, we should keep the information about road, building, forest, etc. In conclusion, we did analyze and compare the performance of compression and decompression for JPEG and WSQ(wavelet scalar quantization) method. As a result, we knew that WSQ was more efficient than JPEG.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10c
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• pp.653-655
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• 1998

본 논문은 3차원 지형을 현실감 있고 효율적으로 구축하기 위하여, 등고선 데이터로부터 지형의 특징점을 추출하고 이를 이용하여 3차원 지형 데이터를 복원하는 방법을 제안한다. 래스터 기반의 거리변환기법 알고리즘을 사용하여 2차원의 등고선 데이터로부터 3차원 지형을 생성하며, 생성된 3차원 지형정보로부터 지형의 특징점을 추출한다. 복원된 3차원 지형을 격자망 형태로 시각화하는데, 이때 특징점의 높이정보를 이용함으로써 지형을 표시하는데 요구되는 정보의 크기를 감소시킨다. 제안한 방법은 사용자가 상호대화식으로 수행할 수 있는 프로그램으로 윈도우 환경의 PC상에서 구현되었다. 이 프로그램의 실험결과는, 기존의 방법보다 적은 데이터양으로 3차원 지형을 시각화할 수 있음을 보여준다.

• Proceedings of the KAIS Fall Conference
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• 2010.05a
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• pp.527-530
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• 2010

본 논문에서는 가상현실을 이용한 가상현실의 기술을 활용하여 유적지와 문화재를 반 영구적으로 보존할 뿐만 아니라 우리의 문화재를 널리 알리는 데에 있어 활용성 또한 효과적이며 그 활용방법이 다양하고 효율성을 높여 주는 문화 유적지 디지털화 복원 컨텐츠를 제작하는데 그 목적이 있다.