• Applied Biological Chemistry
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• 제46권2호
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• pp.107-112
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• 2003

천마를 채취한 그대로 이용하는 데에는 생체보존에 따른 불편, 독성 그리고 자극성 등의 부작용으로 간단한 전처리 과정이 필요하다. 본 연구에서는 천마를 이용한 가공제품의 개발을 위한 전처리 과정 중 증자 조건별로 천마의 항산화적 특성을 반응 표면 분석법으로 모니터링하여 최적 증자 조건을 설정하였다. 총페놀성 화합물의 함량은 증자온도 $94.43^{\circ}C$, 증자시간 42.38min에서 최적이었고 전자 공여능은 증자온도 $101.67^{\circ}C$, 증자시간 41.09min에서 최적조건이었다. 항산화능 및 아질산염 소거능은 $100^{\circ}C$, 40min의 동일조건에서 최적으로 나타났다. 위 항산화적 특성의 증자조건을 종합하여 superimposed contour map으로 최적조건을 예측한 결과, 증자온도 96{\sim}107{\circ}C$, 증자시간 $28{\sim}46min$으로 나타났다. 예측된 임의의 증자조건 $100^{\circ}C$, 40min으로 실제 항산화 관련값을 측정한 결과 예측값의 $95.9%{\sim}115.6%$으로 유효성이 높게 나타났다.

• The Korean Journal of Ecology
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• 제18권3호
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• pp.307-321
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• 1995

Division of ecoregions having respective functions was attempted through quantitative and qualitative analysis on vegetation diversity, and heterogeneity and on soil environment of the study sites. Field research was carried out in a square of 81 ㎢ around Andongpo (126°38'E, 37°30'N), Kimpo-gun, Kyonggi provice. Conventional methods applied are as follows: classical syntaxonomy by the Zurich-Montpellier School, interpolation method to determine the degree of diversity, heterogeneity and distribution pattern of vegetation, and correlation analysis between soil properties and plant communities. 41 plant communities were identified and composed of 6 forests, 4 mantle and 31 herb communities including 6 saltmarsh plant communities. In a mesh, number of plant communities was highly correlated to the number of species. The highest number of plant community and species was 25 communities·km-2·mesh-1 and 381 species· km-2·mesh-1 ,and the highest value of vegetation heterogeneity was 28.1 species· community-1·mesh-1. Their lowest numbers were 4 communities·km-2·mesh-1. and 28 species·km-2·mesh-1. and 7 species·community-1·mesh-1, respectively. Contour map on vegetation diversity and heterogeneity enabled us to establish two regions; coastal and inland vegetation. Isoline 〔150〕,〔10〕and〔10〕and〔15〕on the species diversity, the community diversity and the vegetation heterogeneity, respectively, were regarded as ecolines in the study area. Cl- content was recognized as the most important factor from correlation analysis between soil properties. Ordination of sites indicated that the study area be divided into two edaphic types: inland and coastal habitats. It was considered that the extent of desalinization in soil played a major role in determining the species composition in the reclamed area. By matching edaphic division of habitats with division of vegetation structures, designation of ecoregion was endorsed. The approach of current study was suggested as an effective tool to implement an assessment of the vegetation dynamics by the disparity of natural environment and anthropogenic interferences.

• 대한전기학회논문지:시스템및제어부문D
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• 제54권11호
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• pp.680-688
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• 2005

The electrical current generated by heart creates not only electric potential but also a magnetic field. We have observed electrophysiological phenomena of the heart by measuring components of magnetocardiogram(MCG) using 61 channel superconducting quantum interference device(SQUD) system. We have analyzed the possibility and characteristics of MCG parameters for diagnosis of ischemic heart disease. A technique for automatic analysis of MCG signals in time domain was developed. The methods for detecting the position, the interval, the amplitude ratio, and the direction of single current dipole were examined in the MCG wave. The position and interval parameters were obtained by calculating the gradients of a envelope curve which could be formed by the difference between the maximum and minimum envelope of multi-channel MCG signals. We show some differences of the frequency contour map between the normal MCG and the abnormal (ischemic heart disease) MCG. The direction of single current dipole can be defined by rotating the magnetic field according to Biot-Savart's law at each point of MCG signals. In this study, we have examined the direction of single current dipole from searching for the centroids of positive and negative magnetic fields. The amplitude ratio parameters for measuring 57 deviation consisted of A$_{T}$/A$_{R}$ and other ratios. and We developed a new analysis method, which is based on the frequency contour map of electromagnetic field. Using theses parameters, we founded significant differences between normal subjects and ischemic patients in some parameters.

• 한국전자파학회논문지
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• 제25권2호
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• pp.255-258
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• 2014

바이스태틱 레이더 환경에서 지상 표적의 이미징은 수신 데이터 획득 시간 동안에 송신부 및 수신부의 이동에 따른 레인지 및 도플러 정보의 변화가 복잡하여 이에 대한 보상과정, 즉 이미징 과정이 모노스태틱 레이더 환경에 비해 상당히 어렵다. 본 논문에서는 아이소레인지(isorange)와 아이소도플러(isoDoppler) 컨투어 정보를 이용하여 이미징이 가능한 resolution 격자를 추출할 수 있는 바이스태틱 레이더 송수신기 geometry를 제시하고, 고정된 표적을 이미징할 수 있는 알고리즘을 제시한다. 또한, 이때 얻을 수 있는 해상도를 분석하고, 시뮬레이션으로 성능을 검증한다.

• 한국과학교육학회지
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• 제27권4호
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• pp.285-296
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• 2007

본 연구에서는 지구과학 그래프 유형을 분석하기 위한 기준을 만들고, 과학 교과서 비교 분석을 통하여 지구과학 그래프의 유형과 특징을 파악함으로써 지구과학 교과서에서 그래프의 기능과 구조에 대한 시사점을 얻고자 하였다. 지구과학 교과서 분석 결과, 선 그래프와 등치선도가 많이 사용되고 있는 것으로 나타났다. 선 그래프 중에는 단순 선 그래프 이외에도 다중 선 그래프와 YX 그래프의 사용 비율이 특히 높았다. 다른 과학 교과의 그래프와 비교 분석한 결과, 지구과학 교과는 다른 과학 교과에 비해 사용되는 그래프의 수가 많고 그 유형이 다양함을 알 수 있었다. 특히, 다른 과학 교과에 비해 선 그래프의 비율은 낮은 반면 등치선도, 분산 그래프 등의 비율이 높았다. 선 그래프 중에서는 특히 YX 그래프의 비율이 다른 교과에 비해 매우 높아 지구과학 교과의 가장 특정적인 그래프인 것으로 나타났다. 본 연구의 결과는 지구과학 교과서에서 그래프의 구조와 기능면에서의 개선을 시사하며, 학생들의 그래프 해석 능력에 대한 후속 연구를 제안한다.

• 한국농공학회논문집
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• 제46권7호
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• pp.3-12
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• 2004

The need to predict the rate of soil erosion, both under existing conditions and those expected to occur following soil conservation practice, has been led to the development of various models. In this study Morgan model especially developed for field-sized areas on hill slopes was applied to assess the rate of soil erosion using RS/GIS environment in the Dukchun river basin, one of two tributaries flowing into Jinyang lake. In order to run the model, land cover mapping was made by the supervised classification method with Landsat TM satellite image data, the digital soil map was generated from scanning and screen digitizing from the hard copy of soil maps, digital elevation map (DEM) in order to generate the slope map was made by the digital map (DM) produced by National Geographic Information Institute (NGII). Almost all model parameters were generated to the multiple raster data layers, and the map calculation was made by the raster based GIS software, IL WIS which was developed by ITC, the Netherlands. Model results show that the annual soil loss rates are 5.2, 18.4, 30.3, 58.2 and 60.2 ton/ha/year in forest, paddy fields, built-up area, bare soil, and upland fields respectively. The estimated rates seemed to be high under the normal climatic conditions because of exaggerated land slopes due to DEM generation using 100 m contour interval. However, the results were worthwhile to estimate soil loss in hilly areas and the more precise result could be expected when the more accurate slope data is available.

• 대한공간정보학회지
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• 제3권2호
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• pp.29-42
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• 1995

도로의 기본설계가 평면 지형도상에서 수작업에 의해 이루어 끼고 있어 많은 시간과 인력이 소요될 뿐만 아니라 효율적인 면에서 많은 문제가 제기되고 있다. 최근 GSIS를 이용한 지형정보처리에 많은 관심이 모아지면서 3차원 수치지형정보를 이용한 효율적인 도로설계방법의 연구가 활발히 진행되고 있다. 본 연구는 도로설계를 위한 지형정보를 보다 효율적으로 해석하기 위해서 데이터베이스를 구축하고 분석하는 과정에 SQL을 응용하므로써 객관적이고 종합적인 근거의 자료제시와 입체적인 지형정보해석의 가능성을 제시한 것이다. 본 연구에서는 축척 1:5,000의 연구대상지역의 지형도를 3차원 기본토로 생성하고 등고선도, 토지이용도, 도로망도 및 수계도 등의 다양한 주세도의 지형 정보를 획득하였다. 완성된 지형도의 도형 정보와 데이터베이스의 속성 정보를 연결해 지형 정보를 구축하고, 노선계획을 함에 있어서 SQL을 응용하였다. 또한 도로설계를 위해 예비노선에 대한 종 횡단면도와 토공량 등의 설계자료를 보다 신속하고 효율적으로 산출하였고, 설계 후 도로형상과 자연경관을 DTM으로 구성하여 시각적으로 파악할 수 있었으므로 도로설계에 효율적인 방법으로 응용될 수 있을 것이다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.312-316
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• 2004

The paper presents a technique to identify the boundary of the optic disc in infant retinal digital images using an approach based on active contours (snakes). The technique can be used to be develop a automate system in order to help the ophthalmologist's diagnosis the retinopathy of prematurity (ROP) disease which may occurred on preterm infant,. The optic disc detection is one of the fundamental step which could help to create an automate diagnose system for the doctors we use a new kind of active contour (snake) method has been developed by Chenyang et. al. [1], based on a new type of external force field, called gradient vector flow, or GVF. GVF is computed as a diffusion of the gradient vectors of a gray-level or binary edge map derived from the image. The testing results on a set of infant retinal ROP images verify the effectiveness of the proposed methods. We show that GVF has a large capture range and it's able to move snakes into boundary concavities of optic disc and finally the optic disk boundary was determined.

• 한국대기환경학회지
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• 제21권6호
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• pp.613-624
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• 2005

In this study, we investigated the characteristic of volatile organic compounds (VOCs) concentrations in Shiwha area, which were measured using the Open-path FTIR Gas Analyzer. The passive samplers were set for a certain period of time to obtain the average concentration of toluene, ethylbenzene, o-xylene and styrene. In addition, VOCs concentration contour maps were constructed using the Tecplot program to illustrate the VOCs concentration distribution. The residential area showed higher concentrations than the industrial area. And the summer had higher concentration value than the winter. Also, we confirmed that the VOCs concentrations ranged from 2 to several tens ppb in the vicinity of an industry than diffused VOC concentration, whereas those ranged from 0 to 5 ppb in most other areas. It was conferred that the wind change with seasons significantly affects the distribution of VOCs concentrations such as a northwesterly wind in the winter or a southwestern wind in the summer.

• KSTLE International Journal
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• 제3권1호
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• pp.60-67
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• 2002

Wear on the tube-to-spring contact is investigated experimentally, The vibration of the tube causes the wear while the springs support it As for the supporting conditions, the contacting normal farce of 5 N,0 N and the gap of 0.1 mm are applied. The gap condition is for considering the influence of simultaneous impacting and sliding on wear. The wear volume and depth decreases in the order of the 5 N,0 N and the gap conditions. This is explained from the contact geometry of the spring, which is convex of smooth contour, The contact shear force is regarded smaller in the case of the gap existence compared with the other conditions. The wear mechanism is considered from SEM observation of the worn surface. The variation of the normal contact traction is analysed using the finite element analysis to estimate the slip displacement range on the contact with consulting the fretting map.