• 한국환경복원기술학회지
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• 제10권1호
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• pp.57-71
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• 2007

While a concept on biotop or the urgency of its classification systems have been under discussion recently, this study aims to examine outdoor biotop classification systems for environment-friendly community. To this end, the feasibility of creating a biotop in the community and application elements were generated and biotops were classified and categorized. Then, elements that can be applied in consideration of traditional Korean techniques were generated and biotop classification systems and specific components in residential areas were reviewed. As for the result of this study, based on a preliminary draft prepared through literature review, considerations for biotop classification systems were taken into account. Then, based on classification criteria for biotop formats, biotop functions and biotop types, a second-tier classification system was developed. Criteria for biotop formats included surfaces, lines and points while criteria for biotop functions were large cores, small bases, corridors, stepping stones and ecological islands. Criteria for habitat types were divided to include natural forest, developed green areas, lacustrine wetland, palustrine wetland, shrubs, grasslands, linear habitats, vacant plots and practical green areas, which were sub-categorized. As for the biotop classification system, macro-classification divided biotops into three types-space, line and point-based on biotop formats. Meso-classification had five groups and micro-classification had 21 groups based on habitat types. Future studies should focus on the ecological features of each biotop categories generated in this study and their creation and management techniques to find many practical methods to create, protect and manage outdoor biotop for environment-friendly community.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.753-756
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• 1991

This paper aimed to analyse dose sensitivity to the controllable parameters of in-door radon $(^{222}Rn)$ and its decay products(Rn-D) by applying the input-output linear system theory. Physical behaviors of $^{222}Rn$ & Rn-D were analyzed in terms of $^{222}Rn$ gas generation, -migation and - infiltration to indoor environments, and the performance output-function(i.e. mean dose equivalent to Tracho-Bronchial(TB) lung region was assessed to the following ranges of the controllable parameters; a) the ventilation rate constant $({\lambda}_v)$ : $0{\sun}500[h^{-1}]$. b) the attachment rate constant$({\lambda}_a)$ : 0-500 $[h^{-1}]$. c) deposition rate constant $({\lambda}{_{d}^{u}})$: 0-50$[h^{-1}]$. A linear input-output model was reconstructed from the original models in literatures, as follows, which was modified into the matrices consisting of 111 nodal equations. a) indoor ${222}Rn$ & Rn-D Behaviour: jacobi- Porstendorfer- Bruno model. b) lung dosimerty : Jacobi-Eisfeld model. Some of the major findings, which identify the effectiveness of this model, were as follows. a) ${\lambda}_v$ is most effective, dominant controllable parameters in dose reduction, if mechanical ventilation is applied. b) ${\lambda}_v$, depending on the air particle-concentration, reduces the dose somewhat within ${\lambda}_v$<1 $h^{-1}R range. However, the dose increases conversely, ${\lambda}_v$>1 $h^{-1}R range range. c) ${\lambda}{_{d}^{4}}$ reduces the dose linearly as ${\lambda}_v$ dose. Such dose(z-axis) sentivities are shown with three-dimensional plots whoes x,y-axes are combined 2out the 3 parameter${\lambda}_v{\lambda}_s,\;{\lambda}_d^s$.

• 한국농공학회논문집
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• 제49권2호
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• pp.3-13
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• 2007

The primary objective of this study was to compare water use efficiencies between subsurface drip irrigation and furrow irrigation. The uniformity of used drip lines was tested to determine if clogging would be a threat to the long-term success of a subsurface drip irrigation system. Three crops, cantaloupe, lettuce, and bell pepper, were grown in four plots for each irrigation system. Significantly less water was applied with subsurface drip irrigation than with furrow irrigation (29.5 % less for cantaloupe and 43.2 % less for bell poppet) in order to produce similar crop yields. Water use efficiencies with subsurface drip irrigation were significantly higher than those with furrow irrigation fur cantaloupe (P-value = 0.018) and bell pepper (P-value ${\leq}$ 0.001). Drip-irrigated lettuce, a shallow-rooted crop, had moderately higher water use efficiency during the first two seasons, while no difference was observed in the third season. After the experiment, the uniformity of the drip lines was 92.1 % on average and classified as good. The high values fur water use efficiency and uniformity indicate that subsurface drip irrigation can be a sustainable method for conserving irrigation water.

• 아시안잔디학회지
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• 제26권2호
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• pp.102-109
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• 2012

Typhula incarnata에 의한 설부병 방제를 위한 살균제의 효과를 골프코스에서 평가하였다. 살균제의 살포효과, 살균제의 혼용효과, 살균제의 살포방법에 의한 효과 및 살포시기에 의한 설부병의 방제효과에 미치는 영향을 용평 골프장에서 평가하였다. 무처리구는 3종의 살균제처리구보다 병 피해가 더욱 심각하였다. 3종의 살균제(Azoxystrobin, propiconazole, tebuconazole)는 Kentucky bluegrass 종과 creeping bentrasss 종의 잔디에서 80% 이상의 설부병을 방제하는 효과가 있었다. 2종 이상의 혼용살포에 의한 설부병의 방제효과는 Kentucky bluegrass 종에서 93% 이상 방제효과가 있었다. Azoxystrobin 살균제를 관주와 경엽살포에 대한 설부병 방제 효과는 2종의 잔디에서 모두 유의성의 차이가 없었다. 살균제 살포시기에 따른 설부병 방제 효과는 tebuconazole 살포구에서 유의성 있었다. 이른 가을에 살포하는 것이 더 효과적이었다.

• 한국콘텐츠학회논문지
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• 제17권12호
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• pp.272-280
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• 2017

본 논문은 한국 영화 <수상한 그녀>와 이 영화의 중국판 <20세여 다시 한 번>의 내용을 비교 분석하였다. 양국에서 모두 흥행에 성공한 두 영화는 인물 설정, 전개 등 전반적인 서사구조는 동일하지만, 두 사회의 상이한 사회적 조건으로 인하여 차이점도 다수 노출하고 있다. 예를 들면, 여성을 모성애를 중심으로 수동적으로 묘사하고, 남성은 가부장적 지위를 고수하는 존재로 설정하고 있으며, 주종이라는 전근대적 신분 격차가 암묵적으로 존속하고 것으로 <수상한 그녀>는 그리고 있다. 반면, 중국판 <20세여 다시 한 번>은 여성을 좀 더 개인적으로, 남성은 가정에서 평등한 존재로 묘사한다. 국가는 사회 신분 격차를 망각할 수 있게 하여 남성성 복원의 주도자가 된다. 두 영화가 보여주는 차이의 근원에는 중국이 20세기 들어 꾸준히 유교 철폐, 양성평등 등의 노력을 한 반면, 한국은 자본주의 하에서 가정/사회, 여성/남성의 차별적 노동 논리를 전근대적 가치관과 타협, 온존시킨 역사적 사회적 차이에서 비롯되었음을 본 논문은 발견하였다.

• 폴리머
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• 제31권6호
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• pp.532-537
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• 2007

본 연구에서는 poly(vinyl alcohol)(PVA)를 dimethyl sulfoxide(DMSO)에 녹여 이 용액의 유변학적 특성에 미치는 PVA의 분자량분포의 영향에 관하여 고찰하였다. 동일 평균분자량인 경우에도 수지 혼합(resin blending)에 의해 분자량분포가 넓어지면 점도와 손실탄성률이 더 낮아짐을 알 수 있었다. 이것은 동일 평균 분자량의 경우 분자량분포가 넓은 PVA/DMSO 용액계의 자유체적이 증가되기 때문이라고 생각된다. 분자량 분포가 저장탄성률에 미치는 영향은, 14 wt%용액의 경우에는, 1.3 rad/sec보다 낮은 진동수 영역에서는 동일 평균분자량의 경우 분자량분포가 넓은 PVA/DMSO 용액계가 탄성이 더 크고, 1.3 rad/sec보다 높은 진동수 영역에서는 분자량분포가 좁은 PVA/DMSO 용액계가 탄성이 더 크게 측정되었다. 14 wt% 용액의 경우에 Modified Cole-Cole plot에서의 기울기는 분자량분포가 넓어지면 진동수에 따른 상전이 현상이 더 뚜렷해졌다.

• 대한화학회지
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• 제31권3호
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• pp.215-224
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• 1987

0.35. 0.75 및 1.25mol% $MgO-TiO_2$계의 전기전도도가 $600{\sim}1100^{\circ}C$ 및 $10^{-8}{\sim}10^{-1}$ atm의 산소분압하에서 측정되었다. 일정한 산소분압하에서 $log{\sigma}$ vs. 1/T은 두 온도구간에서 직선관계를 보였으며 직선의 기울기로 부터 계산된 활성화에너지는 본성 영역과 외성 영역에서 각각 1.94eV 및 0.48eV이다. $log\;{\sigma}$ vs log $Po_2$는 본성 영역에서 ${\sigma}\;{\alpha}\;$Po_2^{-1/6}$이며 외성 영역에서 ${\sigma}\;{\alpha}\;$Po_2^{-1/4}$이다. 이 계의 결함구조는 외성 영역에서 $V\"{o}$이며 본성 영역에서 $Ti^3$.로 제안되었다. 특히 외성 영역에서 polaron model이 ${\sigma}$의 T 및 p 의존성으로 부터 규명되었다.

• 전자공학회논문지SC
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• 제46권1호
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• pp.43-48
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• 2009

광섬유 격자 센서어레이용 파장가변 광섬유 레이저의 출력파장변화를 복조할 수 있는 시스템을 제안하였다. 광섬유 레이저는 반도체 광증폭기와 Fabry-Perot 필터를 이용하여 제작하였고, 더블패스 마하젠더 간섭계 구조를 적용하여, $90^{\circ}$위상차를 가지는 내부 트리거를 생성하였다. 내부 트리거를 이용하여 얻은 Lissajous 그래프에 원형 피팅을 적용하여 2.51 mrad의 평균위상오차를 얻었다. 실험을 통하여 파장가변필터의 비선형 동작 특성에 의한 광섬유 레이저의 비선형 출력을 확인하였다. 제안한 파장검출 방법을 적용하면 파장가변광원의 비선형성을 보상하여 광섬유격자 센서시스템을 위한 효율적인 광원으로 적용이 가능할 것으로 예상된다.

• Structural Engineering and Mechanics
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• 제24권1호
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• pp.1-18
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• 2006

Strengthening of existing old structures has traditionally been accomplished by using conventional materials and techniques, viz., externally bonded steel plates, steel or concrete jackets, etc. Alternatively, fibre reinforced polymer composite (FRPC) products started being used to overcome problems associated with conventional materials in the mid 1950s because of their favourable engineering properties. Effectiveness of FRPC materials has been demonstrated through extensive experimental research throughout the world in the last two decades. However there is a need to use refined analytical tools to simulate response of strengthened system. In this paper, an attempt has been made to develop a numerical model of strengthened reinforced concrete (RC) beams with FRPC laminates. Material models for RC beams strengthened with FRPC laminates are described and verified through a nonlinear finite element (FE) commercial code, with the help of available experimental data. Three dimensional (3D) FE analysis has been performed by assuming perfect bonding between concrete and FRPC laminate. A parametric study has also been performed to examine effects of various parameters like fibre type, stirrup's spacing, etc. on the strengthening system. Through numerical simulation, it has been shown that it is possible to predict accurately the flexural response of RC beams strengthened with FRPC laminates by selecting an appropriate material constitutive model. Comparisons are made between the available experimental results in literature and FE analysis results obtained by the present investigators using load-deflection and load-strain plots as well as ultimate load of the strengthened beams. Furthermore, evaluation of crack patterns from FE analysis and experimental failure modes are discussed at the end.

• 대한전기학회논문지:전력기술부문A
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• 제49권5호
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• pp.226-232
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• 2000

This paper presents application results of the augmented matrix eigen-sensitivity theories to TCSC siting problem for damping the inter-area low frequency oscillation in the large KEPCO system. First and second-order eigen-sensitivities of the inter-area low frequency oscillation in the large KEPCO system. First and second-order eigen-sensitivities of the inter-area mode are computed fro changes in susceptance of the transmission lines. The lines having high sensitivity are chosen as the initial candidates for installing TCSC. Then for each of the chosen candidates, Bodeplot of the transfer function with line susceptance as the input and the bus voltage at one side of the line as the output is computed. Using the Bode plots, the lines having any zeros near the inter-area mode are screened out since design of TCSC controller is very difficult in such a case. The $H_{\infty}$ TCSC controller installed at any finally chosen candidate is found to be effective in damping the inter-area oscillation, and the proposed TCSC siting algorithm is proved to be valid. Design of $H_{\infty}$ controller is described in Part IIof this paper.