• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2013.05a
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• pp.111-111
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• 2013

골이식 부위에서 연조직의 붕괴를 막아주면서 골이식재를 위한 안정적인 공간을 확보하기 위해서 타이타늄 메쉬가 적용된다. 본 연구에서 생체 불활성의 특성을 보이는 타이타늄 차폐막에 양극산화와 석회화 순환처리에 의해서 생체활성을 부여한 결과, 골형성을 촉진하는 결과를 보여주었다.

• Journal of the Korean Institute of Intelligent Systems
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• v.21 no.1
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• pp.12-18
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• 2011

In this paper, we proposed Interval Type-2 polynomial Radial Basis Function Neural Networks. In the receptive filed of hidden layer, Interval Type-2 fuzzy set is used. The characteristic of Interval Type-2 fuzzy set has Footprint Of Uncertainly(FOU), which denotes a certain level of robustness in the presence of un-known information when compared with the type-1 fuzzy set. In order to improve the performance of proposed model, we used the linear polynomial function as connection weight of network. The parameters such as center values of receptive field, constant deviation, and connection weight between hidden layer and output layer are optimized by Conjugate Gradient Method(CGM) and Space Search Evolutionary Algorithm(SSEA). The proposed model is applied to gas furnace dataset and its result are compared with those reported in the previous studies.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.24 no.5
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• pp.553-567
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• 2011

During the last three years, the possibility of the time reversal Lamb waves has been paid attention to for structural health monitoring of a plate. This study proposes a numerical scheme which can simulate the spatial focusing of time reversal Lamb waves on a rectangular plate. In this scheme, a time reversal process is formulated in the frequency domain using active virtual sensors being equivalent to the mirror effects of an actual sensor due to wave reflection on the plate boundary. Forward and backward Lamb wave propagations are represented by scalar functions for simulating the spatial focusing of time reversal Lamb waves. The validity of the proposed scheme is demonstrated through the comparison to the results of finite element analysis in which the spatial focusing of time reversal Lamb waves is realized by wafer-type piezoelectric(PZT) transducers collocated on a rectangular plate.

• Journal of the Korean Society for information Management
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• v.36 no.1
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• pp.73-94
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• 2019

The purpose of this study is to investigate the quality of service that affects satisfaction of special library users and to suggest ways to improve the function and role of special library. The data were collected by survey and interview method conducted with 111 library users in 6 local research institute using modified questionnaires based on LibQUAL+. The results revealed that human quality factor had more influence on library service satisfaction than space and information quality factor. Also, there were statistically significant influence between library service satisfaction and three sub service factors, such as service attitude, space convenience, and information usability. The interviewers indicated problems of special library service in lack of data, inactivation of digital data, space problem, data sharing problem, and lack of experts. Finally this study proposed several suggestions to improve service quality of special library of local autonomous entity research institution.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.188-189
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• 2023

본 연구는 사용자가 USB에 내장된 스크립트를 실행하여 실시간으로 활성 및 비활성 데이터를 수집하는 라이브 포렌식 도구의 개발에 관한 것이다. 이 도구는 컴퓨터에 USB를 삽입하고 특정 스크립트를 실행하여 중요한 디지털 증거물을 추출하고 분석하는 기능을 제공한다. 도구는 Linux와 Windows 운영 체제용 32비트 및 64비트 버전으로 제작되었으며, 대량의 데이터 처리 시간과 저장 공간 문제를 해결하여 필요한 특정 데이터만 신속하게 추출할 수 있는 효율적인 방법을 제공한다. 이 도구는 활성 데이터와 비활성 데이터를 수집하며, 활성 데이터에는 레지스터, 네트워크 정보, 프로세스 정보, 사용자 정보 등이 포함되며, 비활성 데이터에는 메타데이터, 시스템 설정 정보, 로그 파일 등이 포함된다. 이 연구에서는 라이브 포렌식 도구의 사용 방법과 수집된 결과, 데이터 분석 방법, 그로 인한 보안 이점에 대해 다루고 있다.

• Korean Journal of Environmental Agriculture
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• v.30 no.1
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• pp.76-81
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• 2011

BACKGROUND: Acorus gramineus is of medicinal plants that exhibit variable biological activities for human health and against insect pests. The extracts of A. gramineus was examined in an attempt to develop a natural repellent against human disease-mediating Culex pipiens. METHODS AND RESULTS: The roots of A. gramineus dried under dark conditions were homogenized and extracted with ethanol. The extracts were subjected to repellent activity assays against C. pipiens in a hand-made acrylamide box with three accessible rooms. Significantly low number of mosquitos was found in the room previously fumigated with the extracts at 50 mg/L on the filter paper, exhibiting less than 20% of mosquitos tested. More than 50% of mosquitos tested was found in the room without the extracts, but less than 30% was found in the room that released mosquitos. GC/MS analysis detected ${\beta}$-asarone as a main component of the extracts. The commercial asarones (${\alpha}$ and ${\beta}$) showed a repellent activity at 50 mg/L on the filter paper similar to the extracts. CONCLUSION(S): A. gramineus has potential for use as a mosquito repellent since ${\beta}$-asarone, a main component of the plant, exhibited a strong repellent activity against C. pipiens.

• Clean Technology
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• v.17 no.3
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• pp.225-230
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• 2011

Characteristics of hydrocarbon selective catalytic reduction of NOx using various noble metal catalysts were investigated. The best active metal is Pt, supports are $CeO_2$ and $TiO_2$ by strong interactions between active metals, and 55% of conversion rate of NOx is shown. Pd, Rh and Ag catalysts presented a conversion of less than 20% as active metals, and supports also showed the poor activity compared to $SiO_2$ and $ZrO_2$. Experiments were performed with different types of reducing agents, amount, concentration of oxygen and space velocity in order to investigate the performance of catalysts according to operating conditions. The results confirm that the methane is better than propane as a reducing agent, and as the ratio of methane/nitrogen oxide increases, the catalytic activity increased, as the concentration of oxygen increases and space velocity decreases, the performance of catalysts increased.

• Journal of the Korean Geographical Society
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• v.36 no.2
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• pp.93-110
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• 2001

한반도 남동부지역에서 이루어진 활단층에 대한 일련의 연구들은 구조운도에 대한 관심을 불러 일으키고 우리나라가 안정지괴라는 생각에 변화를 일으키고 있다. 본고에서는 조선시대 한반도에서 발생한 지진 기록을 세계적으로 유례가 드물게 역사적 사실을 정확하게 기록한 조선왕조실록에서 확인하였다. 이 자료와 20세기에 이루어진 계기관측자료를 종합하여 지난 600년 간의 지진발생의 주기성과 공간분포를 검토하였다. 한반도 지진발생은 시.공간적으로 일정한 패턴이 있었으며, 대략 100-150년을 주기로 활성기와 잠복기를 반복하였다. 지진은 평안분지서안, 옥천변성대와 혼성구, 경상분지에서 높은 빈도로 발생하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.7
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• pp.713-719
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• 2016

The NOx conversion properties of Mn-Cu-$TiO_2$ and $V_2O_5$/$TiO_2$ catalysts were studied for the selective catalytic reduction (SCR) of NOx with ammonia. The performance of the catalysts was investigated in terms of their $NOx$ conversion activity as a function of the reaction temperature and space velocity. The activity of the Mn-Cu-$TiO_2$ catalyst decreased with increasing reaction temperature and space velocity. However, the activity of the $V_2O_5$/$TiO_2$ catalyst increased with increasing reaction temperature. High activity of the Mn-Cu-$TiO_2$ catalyst was observed at temperatures below $200^{\circ}C$. H2-TPR and XPS analyses were conducted to explain these results. It was found that the activity of the Mn-Cu-$TiO_2$ catalyst was influenced by the thermal shock caused by the change of the initial reaction temperature, whereas the $V_2O_5$/$TiO_2$ catalyst was not affected by the initial reaction temperature. In the case of catalyst C, the $NO_x$ conversion efficiency decreased with increasing space velocity. The decrease in the $NO_x$ conversion efficiency with increasing space velocity was much less for catalyst D than for catalyst C.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.279-282
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• 2008

단백질의 구조는 그 기능과 밀접히 연관되어 있기 때문에 구조에 조금이라도 변화가 생기면 바로 생체기능에 이상이 생긴다. 그래서 단백질 구조연구는 필수적이고 구조의 유사성 검색을 이용하여 단백질 기능을 예측한다. 그러나 전체적인 구조가 유사한 단백질이라도 기능에 중요한 특정구조가 다르게 되면 다른 기능을 수행 할 수 있고 구조가 다른 단백질이라도 핵심 영역의 구조가 유사하다면 유사한 기능을 수행할 수 있다. 이는 단백질의 기능이 특정 하위구조의 잘 보존된 활성 사이트에 따라 결정되기 때문이다. 이 논문은 단백질의 3차원 공간정보를 matrix로 표현 할 수 있는 가장 작은 평면도형인 삼각형을 이용하여 단백질 표면에 대한 상세한 형태비교를 제공한다. 단백질 표면에서 활성 사이트 아미노산 잔기의 side chain은 일반적으로 바깥을 향하여 표면의 형태를 결정짓기 때문에 단백질 표면을 비교하기 위해 side chain 정보가 필수적이다. 우리는 아미노산 잔기의 Cα원자에 side chain을 포함하여 Cα삼각형과 side chain 삼각형 2개를 하나의 특정하위구조 set으로 정의하고 이 하위구조로 distance matrix를 구축한다. 만들어진 distance matrix에 RMSD를 이용하여 활성 사이트의 표면을 비교한다. 제시한 기법은 단백질의 전체적인 서열과 구조 정보를 이용하지 않고, 활성 사이트의 특정하위 영역만을 고려함으로써 더욱 효과적이고 빠른 시간 내에 상세한 비교를 수행할 수 있다.