• 한국어류학회지
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• 제20권4호
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• pp.279-284
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• 2008

호산천에 서식하는 멸종위기어종인 한둑중개의 섭식생태에 대하여 2006년 9월부터 2007년 8월까지 계절별로 채집하여 조사, 연구하였다. 한둑중개의 소화관 내용물에서 확인된 먹이생물로는 대부분이 수서곤충이었고 그 이외에 선충, 소형어류, 어류의 알, 다슬기 등이 조사되었다. 먹이생물로 이용되는 수서곤충의 상대적중요성지수비는 파리목 (Diptera), 날도래목 (Trichoptera), 하루살이목 (Ephemeroptera), 강도래목 (Plecoptera) 순이었다. Chironomidae sp. 1 (White type)과 Hydropsyche kozhantschikovi가 가장 중요한 먹이생물로 조사되었다. 건조 중량비에 따른 계절적 먹이생물의 변동으로서 봄과 여름에는 Trichoptera의 비율이 가장 높았고, 가을에는 Diptera, 겨울에는 Plecoptera가 가장 비율이 높았다.

• 한국환경과학회지
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• 제15권10호
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• pp.935-943
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• 2006

This study focuses on analyzing the inflow characteristic of contaminants of city water that flows into a main water system like a reservoir, and intends to provide basic data which can be efficiently reflected on water quality management policy and decision making of a reservoir. The conclusion obtained from the analysis of the inflow of a main water system by analyzing the inflow property of city water contaminants is as follows. In the case of Chungju-cheon stream which is the city water, pollution load from the basic outflow is low when it rains, and with high load of basic outflow during the dry season, due to the discharge of pollutants from the city, the quality of water becomes worse. In the case of Chungju-cheon stream, average BOD is $4.53mg/{\ell}$ when it rains, and the contaminants increase and flow in about 7.8% compared to the average BOD during the average droughty season. The average SS concentration in water is $798.67mg/{\ell}$ and increased 97.2% compared to the average droughty season.

• 한국추진공학회지
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• 제5권3호
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• pp.25-32
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• 2001

본 연구에서는 2차원 압축성 Navier-Stokes 방정식을 이용하여, 약한 수직충격파와 난류 경계층의 간섭현상에 대한 피동제어 유동장을 수치계산법으로 조사하였다. 벽 내부에 공동을 가지는 다공벽을 사용하여 충격파와 난류경계층간 상호간섭을 제어하였다. 본 연구로부터 $\lambda$형 충격파의 하류쪽 가지를 중심으로 하여, 그 하류에서는 주유동이 공동내부로 또 그 상류에서는 공동내부로부터 주유동쪽으로 피이드백되는 유동을 관찰하였으며, 다공벽의 구멍을 통하는 유동은 초크하지 않는다는 것을 알았다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2010년도 학술발표회
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• pp.957-961
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• 2010

Multivariate statistical approaches to classify sampling sites with measuring their similarity by water quality data. For empirical study, data of two years at the 9 sampling sites with the combination of 2 depth levels and 7 important variables related to water quality is collected in reservoir. The similarity among sampling sites is measured with Euclidean distances of water quality related variables and they are classified by hierarchical clustering method. The clustered sites are discussed with principal component variables in the view of the geographical characteristics of them and reducing the number of measuring sites. Nine sampling sites are clustered as follows; One cluster of 5, 6, and 7 sampling sites shows the characteristic of low water depth and main stream of water. The sites of 2 and 4 are clustered into the same group by characteristics of hydraulics which come from that of main stream. But their changing pattern of water quality looks like different since the site of 2 is near to dam. The sampling sites of 3, 8, and 9 are individually positioned due to the different tributary.

• 한국지형학회지
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• 제28권4호
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• pp.1-13
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• 2021

In this study is aerial photos and UAV(Unmanned Aerial Vehicle) images were used to analyzed the characteristics of depositional landform changes in the Geum river channels before and after the opening gate of Gongju weir. Based on the depositional landform classification result, the main stream and the bare land occupied most of the area in all periods, and also found that the main stream, mid-channel island, and sand bar occupied a greater degree of area increase or decrease compared to other landforms in the classification items. As a result of analyzing the characteristics of depositional landform changes before and after the opening gate of Gongju weir, it is judged that the depositional landforms have changed due to the decreased water level of the Geum river after the opening of the weir, the summer rainy season and typhoons, river stabilization after the effluence of Daecheong dam, supply and deposition of river sediments and fixation of vegetation. The results derived from this study can be used as basic data for the study of river depositional landforms and the establishment of management and conservation plans for the landforms in river channels.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.87-93
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• 2013

In this research, a new methodology to perform building energy analysis using Industry Foundation Classes (IFC) standard has been studied. With the help of Archicad 14 modeling software, a 3D test model is generated and then exported to IFCXML format. A ruby code program retrieves the building information from the resulting IFCXML file using Nokogiri library. An INP file is created and gets ready for next energy analysis step. DOE 2.2 program analyzes the INP file and gives a detailed report of the energy cost of the building. Case study shows when using the IFC standard method, the Interoperability of the energy analysis is greatly improved. The main stream 3D building modeling software supports IFC standard. DOE 2.2 is able to read the INP file generated by IFC file. This means almost any 3D model created by main stream modeling software can be analyze in terms of energy cost Thus, IFC based energy analysis method has a promising future. With the development and application of IFC standard, designers can do more complex and easy-to-run energy analysis in a more efficient way.

• 한국전통조경학회지
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• 제34권1호
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• pp.18-39
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• 2016

본 연구는 조선시대 궁궐에 나타난 핵심전각의 배치형식을 주산과의 관계로 검토하여 궁궐 축선에 투영된 풍수개념과 그에 따른 계획원리를 고찰하는 것이다. 조선 건국 직후 창건된 경복궁은 거대한 분지의 중앙에 입지한 자금성과는 달리 도성 서북쪽에 치우친 곳이면서 백악산의 산줄기가 끝나는 지점에 입지하였다. 태종 때 창건된 창덕궁도 마찬가지로서 삼각산의 또 다른 지맥인 응봉 아래에 궁궐터가 마련되었는데, 모두 산의 정기를 궁궐에 담으려 했던 의도를 담고 있다. 이러한 관념은 구체적으로, 궁궐 내부의 정전, 편전, 침전 등 임금과 관련된 주요 건물의 배치가 주산의 내맥에 따라 배치되는 것으로 이행되었다. 특히 대내에 들어와 있는 아미사는 궁궐터가 정해졌던 근거지형이기도 했지만 전각배치가 이루어진 기준점으로 작용하였다. 아미사를 기점으로 하는 축선은 풍수적 의미의 좌향이 건축적 형식으로 구현되는 형식이었으며, 주례에 근거한 전조후침과 삼문삼조를 실현하는 형식으로 통합되어 나타났다. 한편 양궐 모두 아미사가 혈진처(穴盡處)를 이루고 있는 곳 가까이에는 임금의 정침이 우선적으로 입지되었다. 침전의 남쪽에는 보통 편전이 배치되었는데, 이는 임금이 아미사 혈의 순수한 지기를 가장 먼저 점유하고 누리고자 하는 실리를 따른 결과로 판단된다. 중축선 배치가 뚜렷한 경복궁의 경우, 하나의 주맥 하에 침전, 편전, 정전이 일원적으로 배치되었고, 내맥이 분산된 창덕궁은 정전과 침전의 축이 형편에 따라 나뉘어 졌다. 정전의 입지형식은 최소한의 풍수적 이점을 취하되 왕의 권위를 드러내는 공간의 질서와 형식이 보다 중시된 것으로 조사되었다.

• 한국지역지리학회지
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• 제14권1호
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• pp.27-39
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• 2008

본 연구는 낙동강과 그 지류인 금호강에 형성된 호소성 습지의 형성과정을 밝히고자 하였다. 이를 위하여 세 시기의 지형도를 비교 분석하고 단면도를 작성하였으며, 퇴적물의 입경분포를 분석하였다. 그 결과 호소성 습지의 형성 과정을 3가지로 유형화하였다. 첫째, 샛강습지와 금강늪은 망류하천을 이루고 있는 구간에서 분류하여 흐르는 유로의 자유로운 이동 과정에서 남아 형성된 잔적호 습지이다. 둘째, 씩실늪과 낫늪은 배후산지에서 흘러나온 지류가 자연제방의 방해로 유로가 차단되어 자연제방과 평행하게 흘러 본류로 유입되는 yazoo형 습지이다. 셋째, 세천늪과 호촌늪, 진촌늪은 본류 하천의 범람으로 자연제방과 배후습지가 형성된 이후에 다음 홍수시 범람하는 본류 하천이 습지로 유입되어 형성된 범람 유입수형 습지이다.

• 한국연초학회지
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• 제33권1호
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• pp.28-38
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• 2011

This experiment was conducted as a part of Asia collaborative study on purpose of verifying the difference between CM6 and CM7 including 3R4F for reference. It carried out using various analytical categories for example, main stream, sidestream and Av. smoke. Additional analysis such as physical properties, blending ratio, combustibility and general leaf component analysis also implemented in order to investigate the difference. We complied with ISO standard and CORESTA recommended method during analytical operating procedures. In this study, we described that comparative analytical result for CM6 and CM7 known as reference or monitoring cigarettes including 3R4F for reference. All sample cigarettes were conditioned at $22^{\circ}C$, 60% relative humidity for 48 hours. Av. Smoke, MS and SS smoke analysis were performed over five times with two smoking condition, ISO and Health Canada with the exception of Av. smoke analysis. We complied with ISO standard method during analytical operating procedures. And, we conducted additional analysis, such as physical properties, blending ratio, combustibility and leaf component analysis also in order to investigate the difference. In conclusion, we found out some differences between CORESTA monitoring cigarette No. 6 and No 7. The smoke components such as total particulate matters, NFDPM, nicotine and carbon monoxide contents of CM7 were a little lower than CM6. And, these phenomena were the same as not only main stream smoke but also side stream smoke and Av. smoke. This tendency was consistent with ISO and Health Canada smoking condition. Besides, leaf constituents' color of CM7 was darker than CM6. In case of combustibility, it showed short combustion time approximately 30 seconds.

• 생태와환경
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• 제48권1호
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• pp.12-25
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• 2015

The tributaries of Daechung Lake play an important role in controlling eutrophication in the lake, which is used for agricultural purposes and as potable water. However, water quality properties were not extensively studied in the tributaries of Daechung Lake. The objectives of this study are to investigate spatial and temporal properties of water quality and to characterize streams which could threaten water quality of Daechung Lake. For this study, water samples were weekly or monthly collected from February 2014 to October 2014 in 9 streams. Water quality parameters analyzed in this study include biochemical oxygen demand (BOD), chemical oxygen demand (COD), total organic carbon (TOC), total nitrogen and phosphorus (TN and TP), suspended solids (SS), and chlorophyll a. Based on temporal distribution and principal component analysis, BOD, COD, TOC, SS, and TP were controlled by not only river discharge that increased during summer due to heavy rain fall, but also due to anthropogenic input (e.g., bridge construction and/or agricultural activity). Dilution is also one of the factors explaining TN and conductivity, both of which decreased with increased discharge. Generally, concentrations of contaminants (BOD, COD, TOC, TN and TP) in the tributaries were higher than those of Daechung Lake. However, pollution load indicated that only the main channel of Geum River and Sook Stream may largely influence lake waters, attributed mostly to their large volumes. This implies that the main channel and Sook Stream are the major influences on the water quality of Daechung Lake.