• 한국식품과학회지
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• 제9권1호
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• pp.19-23
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• 1977

The variation of the amount of starch, size and shape of the starch granules, amylose content, and blue value of the starch in the Korean ginseng roots from one year old to five year old cultivated at Kumsan was studied. The results obtained were as follows; 1) The starch content of the ginseng root(dried) was increased with the age of the root; that is, 9.62% for one-year-old roots, 10.35% for two-year-old root, 15.50% for three-year-old root, 17.05% for four-year-old root, and 18.32% for five-year-old root. 2) The shape of the ginseng starch granules was round or short oval, and in the latter case the ratio of minor axis to major axis was 1 to 1.1. Diameter of the starch granules was in the range of $1.48\;{\mu}\;to\;8.14\;{\mu}$ and the most frequent granule size was $3\;{\mu}\;(32.1{\sim}35.7%)$. The number of big size starch granules was increased during the five years of growing, while, the number of small size granules was decreased. 3) The amylose content in the ginseng starch was varied with the age of the root, in the range of $53.6{\sim}70.5%$. 4. The blue value of the ginseng starch was in the range of 0.60 to 0.71.

• 헤리티지:역사와 과학
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• 제44권1호
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• pp.182-195
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• 2011

천연기념물 노거수는 오랫동안 우리 민족의 역사, 문화와 함께해 온 존재로서 단순한 나무 이상의 의미를 지니고 있다. 문화재청에서는 노거수 중에서도 크기뿐만 아니라 진귀성, 상징성, 고유성 등 문화적 자연적 요소가 뚜렷한 것들을 천연기념물로 지정하여 보호하고 있다. 본 연구는 천연기념물 노거수 중 강원도내 분포하는 14건의 생육현황과 제원 및 토양환경, 보호시설 현황을 파악하고자 수행하였다. 연구결과, 강원도의 천연기념물 노거수는 78.57% 이상이 보통이거나 보통 이상의 생육현황을 나타내었다. 수고는 평균 18.80m, 근원둘레는 평균 7.34m인것으로 나타났다. 토양환경 분석결과 대부분 전국 산림토양 대비 평균치를 나타내었으나 유효인산은 과영양 상태인 것으로 분석되었다. 보호시설은 대부분 양호한 상태이나 지주대와 쇠당김 시설 일부는 수목에 피해를 주고 있는 것으로 나타났다. 본 연구는 강원도 내 천연기념물 노거수의 생육환경과 관리현황 분석을 통한 관리 기초자료 제공에 의의를 두며, 생육에 영향을 주는 환경인자와의 관련성 등은 추후 과제로 남겨둔다.

• 한국강구조학회 논문집
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• 제12권3호통권46호
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• pp.231-238
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• 2000

본 연구는 용접지단부의 후처리 결과, 상대적으로 피로강도가 낮아진 용접루트부에 초점을 맞추었다. 용접루트부의 피로강도를 향상시키기 위하여 부분용입용접을 실시한 십자 리브 시험체와 보통의 필렛용접이음 십자 리브 시험체를 대상으로 피로시험을 행하였다. 그 결과, 부분용입용접을 한 시험체이더라도 용접그대로인 시험체의 경우는 보통의 필렛용접이음과 거의 동등한 피로강도를 보였다. 이것은 피로파괴가 지단부로부터 시작되었기 때문에 용접루트부의 보강책인 부분용입용접의 효과가 나타나지 않았다고 생각된다. 이에, 지단부의 피로파괴를 막기 위해 지단부를 후처리시킨 부분용입용접이음 시험체를 대상으로 피로시험을 한 결과, 보통의 필렛용접이음보다 상당한 피로강도 향상을 보였다. 그러므로 본 연구는 지단부로부터 피로균열 발생을 억제한다면, 부분용입용접이음으로 루트부의 피로강도를 향상시켜, 결국 전체적인 파단수명을 향상시킬 수 있을 것으로 생각한다.

• 한국의상디자인학회지
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• 제19권1호
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• pp.135-145
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• 2017

In order to analysis on color difference of yellow natural dyes, I have dyed cellulose and protein fabrics. The results of experiment have been analysed by wavelength of maximum absorption, amounts of dye uptake, color difference, Hunter's value and Munsell's value. The results from these analyses are as follows : Bud of pagoda tree, Amur cork, and Curcuma showed greenish yellow color, Gardenia Jasminoides showed reddish yellow color. Barberry root showed reddish yellow color with post-mordanting method on cellulose fabric. Moreover, Dupioni silk was dyed in reddish yellow color by Barberry root and Rhubarb. In addition to Chroma index, Gardenia Jasminoides and Curcuma showed clear color overall. However, dyeing rayon and silk by Barberry root, and dyeing silk by Rhubarb showed clear color. Comparing all the results to actual dyed materials, Bud of pagoda tree had small dye uptake, and both ${\Delta}a$ and ${\Delta}b$ value were short which can't recognized the yellow color easily. Dye uptake of Amur cork and Gardenia Jasminoides was small just like Bud of pagoda tree. However, ${\Delta}b$ value order was Gardenia Jasminoides>Amur cork>Bud of pagoda tree. Therefore, Gardenia Jasminoides recognized reddish yellow because of big value of red color and yellow color. In case of Barberry root and Rhubarb which have larger dye uptake, Baberry root recognized yellow color on rayon only, and couldn't recognized yellow color on bleached cotton fabric, ramie, silk, and dupioni silk. Rhubarb recognized yellow color on rayon with pre-mordanting method only, but recognized silk and dupioni silk as brown like color. Moreover, we could not analyze color by dye uptake, Lab, and H(v/c) for Barberry root and Rhubarb. As a result, I think we need to attach color table for the research paper which handled the color of dyeing materials.

• 한국태양에너지학회 논문집
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• 제37권1호
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• pp.81-90
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• 2017

We have analyzed the performance of 58 kWp photovoltaic (PV) power systems installed in Jeddah, Saudi Arabia. Performance ratio (PR) of 3 PV systems with 3 desert-type PV modules using monitoring data for 1 year showed 85.5% on average. Annual degradation rate of 5 individual modules achieved 0.26%, the regression model using monitoring data for the specified interval of one year showed 0.22%. Root mean square error (RMSE) of 6 big data analysis models for power output prediction in May 2016 was analyzed 2.94% using a support vector regression model.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.708-710
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• 2014

최근 금융 분야에서는 빅 데이터를 이용하여 주가예측 모형을 만들어내고 있으며, 특히 금융 시계열 자료의 변동성 집중 현상을 금융 빅 데이터를 이용하여 분석함으로써 세계 주식시장의 동조화 현상을 분석하고 있다. 본 논문에서는 한국과 중국의 일별 주가지수수익률과 일중 주가지수수익률을 이용하여 이들 2개 국가의 대표적인 주가지수 시계열 데이터에 변동성 집중 현상이 존재하는지를 보다 세밀하게 추적하여 양국 주식시장의 동조화 현상을 분석한다. 분석 결과, 한국의 KOSPI와 중국의 Shanghai 종합주가지수의 지수수익률 시계열 자료는 단위근이 존재하지 않으며, 변동성 집중 현상을 보이는 것으로 나타났다. 또한 한국보다는 중국 주식시장의 변동성 집중현상이 보다 강하게 나타나며, 이러한 현상은 일중 주가지수수익률 시계열 자료에서 보다 두드러지게 나타났다.

• International Journal of Contents
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• 제17권4호
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• pp.52-61
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• 2021

The 2020 US Presidential Election was a highly-anticipated moment for our global society. During the election period, the most intriguing issue was who would be the winner-Trump or Biden? Among the possible main themes of the 2020 election, from the COVID-19 pandemic to racism, this study focused on feminism ('women') as a main component of Biden's victory. To explore the character of Biden's supporters, this paper focused on internet spaces as a source of public opinion. To guide the data analysis, this study employed four indices from empirical studies on Big Data analytics: issue salience, attention diversity, emotional mentioning, and semantic cohesion. The main finding of this study was that the representative keyword 'women' appeared more prevalently within content related to Biden than Trump, and the keyword pairs indicated that female voters were the main reason for Trump's failure but the root cause of Biden's victory. The results of this study indicated the role of the internet as a forum for public opinion and a fountain of political knowledge, which requires more rigorous investigation by researchers.

• 농촌계획
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• 제17권2호
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• pp.33-41
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• 2011

To evaluate the value of a preserved tree as rural landscape resource, the growth environment and health condition was investigated, and the image evaluation was implemented on land~ape architectural major undergraduate students for zelkova trees in Yesan-gun. The image evaluation results of zelkova trees were as followings; 1) Typical image of preserved tree examined by Semantic Differential Scale were 'Old', 'Big', and 'Good'. 2) The 'big' image of zelkova tree and the height of tree, the width of tree crown, the breast girth of tree, the root girth of tree, the external formation of tree, and the health of tree bark is mutually related. Especially, the correlation between the 'big' and the external formation and the width of tree crown is high. 3) Typical image of preserved tree examined by Likert Scale were 'Natural', 'Green', 'Peaceful', and 'Rural'. 4) The preservation necessity for preserved tree was highly related with the state of ground, and the management necessity for preserved tree was highly related with contamination level and the state of ground. The appropriate management plan for preserved tree are proposed to improve the quality of rural landscape(basis of these results).

• 한국환경생태학회지
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• 제25권5호
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• pp.736-746
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• 2011

본 연구는 광주광역시에 분포하는 보호수 및 노거수의 분포 및 생육현황을 조사하여 보호수와 노거수 관리방안을 제시하고자 시도하였다. 광주광역시에 분포하는 보호수는 9종 68개체로 이 중 광산구가 18개체로 가장 많았으며, 노거수는 10종 155개체로 확인되었다. 기존문헌에 잘못 기록된 종명은 정확한 식물명으로 수정되어야 한다. 보호수의 활력도 평균은 1.2였으며 지면상태 평균은 1.7이었고 노거수의 활력도 평균은 1.3, 지면상태 평균은 2.0으로 활력도는 큰 차이가 없었고 지면 상태는 노거수가 조금 더 좋지 못한 것으로 나타났다. 활력도가 3.2~4.0범위를 보여 절대관리가 필요한 보호수는 광산구 송대동 대촌마을 은행나무 1개체 이었고, 노거수는 광산구 산수동 감동마을의 왕버들 1개체로 나타났다. 보호수 및 노거수의 관리방안에서 제일 중요한 것은 기본적으로 노거수가 자랄 수 있는 최소한의 생육공간을 확보하는 것으로 보호수와 노거수 근계 위의 아스팔트나 시멘트 포장을 제거해 주어야 한다고 판단된다.

• 대한치과의사협회지
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• 제54권8호
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• pp.640-650
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• 2016

Nickel-Titanium (NiTi) rotary instruments have brought a big step toward "efficient" practice of endodontic procedure. The rotary files help clinicians to reduce their working time and also increase the clinical success rate with minimal procedural errors. However, NiTi instruments still have a few drawbacks including unpredictable fatigue fracture. Clinicians may reduce the potential risk of instruments fracture by following some clinical guidelines for rotary instruments. In some clinical cases of instruments fracture, we may try to remove the instruments' fragments or bypass the fragment to reach the apical canal. In some limited cases, the fractured instruments' fragments would not jeopardize the clinical prognosis of root canal treatment. Nevertheless, it is impossible to be overemphasized that the prevention of file fracture is much easier than the removal of fracture fragment. Clinicians need to understand the fracture mechanisms and, in clinic, need to discard the used instruments timely.