• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.466-469
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• 2005

In this study e-map component was designed and developed to possibly overlay with all kinds of thematic maps in various scales and provide the all detailed information by using high-resolution satellite image and GIS. Also, this system has powerful map composition tool to display map such as legend, scale bar, index map and so on. For this, this e-map component was designed by using UML and developed based on Windows 2000 and implemented by using Visual Basic 6.0 as development programming language, Map Objects 2.1 of ESRI as GIS component. Through this system, the forest officials could generate more detailed topography and desired thematic map. In addition, the data consistency in DBMS could be maintained by using SDE (Spatial Database Engine) for their job and share the standard forest database with others in real time.

• 대한수학회보
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• 제52권1호
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• pp.149-157
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• 2015

We show that $C^1$-generically, the shadowable chain component of a $C^1$-vector field containing a hyperbolic periodic orbit is hyperbolic if it is locally maximal.

• 대한수학회지
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• 제33권1호
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• pp.101-119
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• 1996

A complex $n(\geq 2)$-dimensional Kaehlerian manifold of constant holomorphic sectional curvature c is called a complex space form, which is denoted by $M_n(c)$.

• 한국산학기술학회논문지
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• 제14권9호
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• pp.4342-4348
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• 2013

본 연구는 혈청지질과 비만 및 혈압과의 관련성을 검토하기 위하여 2011년 1월부터 12월까지 1년 동안에 대전광역시의 한 대학병원에서 종합건강검진을 받았던 30세에서 69세의 여성 1,381명을 대상으로 TC, TG, HDL-C, LDL-C, SBP, DBP, 비만도, 체지방률을 측정하여 혈청지질과 비만 및 혈압과의 관련성을 분석하였다. 연구결과, TC, TG, LDL-C, 비만도, 체지방률은 30대에서부터 60대에 걸쳐 단계적으로 상승하는 경향을 보였다. TC, TG 및 LDL-C는 혈압이 높아짐에 따라 상승하였으며, 정상혈압군에 비해 고혈압군에서 유의하게 높은 값을 보였다. TC, TG, SBP 는 비만도가 높아짐에 따라 단계적으로 상승하였고, 정상군에 비해 비만군에서 유의하게 높았으며, HDL-C는 비만도가 높아짐에 따라 감소하는 경향을 보였고, 정상군에 비해 비만군에서 유의하게 낮았다. TC, TG, LDL-C, 체지방률 및 비만도는 상호간에 유의한 정상관을 보인 반면, HDL-C와는 음의 상관을 보였다. 주성분분석 결과 제1주성분은 고혈압 인자, 제2주성분은 비만관련 인자, 제3주성분은 연령과 고지혈증 인자, 제4주성분은 고단백지콜레스테롤 인자가 선정되었다. HDL-C와 관련된 요인을 다중회귀분석을 사용하여 검토한 결과 HDL-C에 영향을 미치는 변수로는 연령, TC, TG 및 체지방률이 선정되었다. 위와 같은 결과는 비만도가 높고 혈압이 높은 군일수록 혈청지질치가 높아짐을 시사하고 있다.

• 대한화학회지
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• 제55권4호
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• pp.662-665
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• 2011

실온에서 방향족 알데히드, 말론니트릴과4-히드록시쿠마린을neat 실리카젤 속에서 one-pot반응시켜서 3,4-dihydropyrano[c]chromenes을 좋은 수율로 합성하였다.

• Journal of Microbiology
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• 제45권3호
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• pp.234-240
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• 2007

The DcuS-R two-component system of Escherichia coli senses $C_{4}-dicarboxylates$ of the medium and regulates expression of the genes related to utilization of them. It is known that phospho-DcuR induces expression of genes such as the dcuB-fumB operon, the frdABCD operon, and the dctA gene. We analyzed promoters of the dcuS-R operon to elucidate the transcriptional regulation system. We found a novel internal promoter within the dcuS gene that is regulated by the transcriptional regulator, CRP-cAMP, in both aerobic and anaerobic conditions.

• 센서학회지
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• 제23권2호
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• pp.105-109
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• 2014

Structure and electrical properties of $0.85NaNbO_3-0.15LiNbO_3$ ($(Li_{0.15}Na_{0.85})NbO_3$) ceramics were investigated as a function of sintering temperature. $(Li_{0.15}Na_{0.85})NbO_3$ ceramics were prepared by conventional solid state processing. A main phase of the orthorhombic perovskite structure and secondary phase of $LiNbO_3$ were confirmed for all sintered specimens. Dense $(Li_{0.15}Na_{0.85})NbO_3$ ceramics were obtained at sintering temperature above $1050^{\circ}C$. With increasing sintering temperature, the electromechanical coupling factor ($k_p$), piezoelectric constant ($d_{33}$) and relative dielectric constant (${\varepsilon}_r$) of the sintered specimens increased, while the mechanical quality factor ($Q_m$) decreased. These results are due to the increase of grain size and crystallite size of orthorhombic perovskite structure. Based on the temperature dependence of ${\varepsilon}_r$, stable piezoelectric properties were expected because no phase transition found up to $300^{\circ}C$. Typically, kp of 18%, $d_{33}$ of 34.7 pC/N, ${\varepsilon}_r$ of 135, and $Q_m$ of 62.8 were obtained for the specimens sintered at $1200^{\circ}C$ for 5 h.

• Asian-Australasian Journal of Animal Sciences
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• 제4권3호
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• pp.245-250
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• 1991

Analysis of the characteristics and the grouping of the species of sown and weeds in artificial pastures was studied applying the principal component analysis method. Presency and coverage of six sown species and fifteen weed species which occurred in pastures of under-grazing and optimumgrazing were subject to analysis. From field survey, species were divided into three groups: the group A included five species such as Festuca arundinacea, Lolium perenne and Dactylis glomerata, etc., the group B included eleven species such as Polygonum longisetum, Agrostis alba and Rumex obtusifolius, etc., and the group C included five species such as Miscanthus sinensis, Rubus palmatus and Artemisia princeps, etc. The group A species corresponded to good pasture conditions and management. On the contrary, the group C species occurred in poor pasture conditions with inadequate management. The group B species corresponded to intermediate pasture conditions and management. Interrelated pair species co-existing and species non-co-existing were discovered. Factor loading as negative for the group A species. positive for the group C species and positive but lower than the group C species for the group B species. From these results it is concluded that the principal component analysis seems to one of the useful tools for the analysis of characteristics of species and the diagnosis of sown pasture vegetation, although further studies are required to get more general information about species characteristics.

• 한국정보처리학회논문지
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• 제6권9호
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• pp.2350-2364
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• 1999

본 논문은 객체지향 C++ 클래스 컴포넌트를 분류하여 재사용자에게 필요한 컴포넌트를 제공하기 위한 저장소의 클래스 라이브러리 설계방법을 제안한 것이다. 클래스 라이브러리를 설계하기 위해서 컴포넌트 구성 모델을 정의하였고, Enumerative 분류 방법을 이용한 멀티미디어 영역을 분류하였으며, 문서 클러스터링 방법을 확장하여 유사도에 의한 C++ 클래스를 유사한 그룹으로 분류하는 클러스터 생성 기준을 제안하고 있다. 이 유사 그룹인 클러스터는 클래스 멤버 데이터와 멤버함수 그리고 클래스 유사도를 기반으로 분류되며, 분류된 컴포넌트들은 유사도 관계의 계층구조로 구성된다. 마지막으로 객체지향 개념인 Generalization/Specialization의 C++ 상속관계를 계층구조로 표현할 수 있는 클래스 라이브러리를 설계하였다.

• 한국물환경학회지
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• 제35권4호
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• pp.332-339
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• 2019

A comparative study on the anaerobic digestion efficiency according to the temperature change was conducted considering the characteristics of domestic food wastes with high water content of about 80 % or more. The substrate was tested for anaerobic digestion efficiency in two substrates, a liquid component separated naturally from food waste and food waste itself. In the anaerobic digestion experiments, the digestion efficiency was the highest at $55^{\circ}C$ (thermophilic temperature). However, the digestion efficiency at $45^{\circ}C$(middle high temperature) was lower than that at $35^{\circ}C$(mesophilic temperature). The comparison of general food wastes anaerobic digestion requiring 30 days of hydraulic retention time to the liquid component indicated a stable digestion efficiency even after 15 days of hydraulic retention time.In the experiments conducted on food waste, the digestion efficiency at $55^{\circ}C$ was higher than that at $35^{\circ}C$. When the food waste, especially the liquid component originating from food waste, is treated by anaerobic digestion method, the mesophilic temperature and thermophilic temperature conditions are more favorable in the digestion efficiency than the middle high temperature ($45^{\circ}C$). However, when applying thermophilic or mesophilic temperature anaerobic digestion process operation in the field, the amount of energy input should be considered.