• 센서학회지
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• 제3권2호
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• pp.3-10
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• 1994

LB막의 안정성을 향상시키기 위하여 고분자 LB막의 가교화를 시도하였다. AT-cut 수정진동자를 이용하여 LB누적막의 특성을 분석하여 보았다. 합성한 전개 고분자의 폴리 에테르기가 공기/물 계면에 누워 있는 상태로 존재하지만, 표면압을 가하면 하층액에 수화되어 잠기게 된다. 이와 같은 메카니즘은 하층액에 폴리 알릴 아민과 NaCl, $CaCl_{2}$ 등의 염을 녹여서 실험하여, 더욱 명확히 확인할 수 있었다. 그리고 LB막의 특성을 AT-cut 수정진동자를 이용하여 온라인으로 분석할 수 있었다.

• 한국융합학회논문지
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• 제6권6호
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• pp.1-8
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• 2015

본 논문에서는 기존의 그랩컷 알고리즘을 이용한 객체 검출의 정확도를 향상시키기 위하여 샤프닝 필터를 이용한 영상의 화질을 개선하는 방법을 제안한다. 그랩컷 알고리즘은 사각 윈도우 범위 내에서 객체 추출에 뛰어난 성능을 보이지만, 객체와 배경의 구분이 뚜렷하지 않은 영상에서는 성능이 떨어지는 단점이 있다. 따라서 본 논문에서는 히스토그램 평활화를 통해 밝기 및 선명도를 보강하고, 샤프닝 필터를 이용하여 객체의 경계를 강화하여 기존의 그랩컷 알고리즘보다 객체와 배경의 색상이 비슷한 영상에서 향상된 객체 추출 결과를 보인다. 개선된 그랩컷 알고리즘을 토대로 문자인식, 실시간 객체추적 등 영상처리 융합 기술에서 향상된 결과를 얻을 수 있다.

• 한국환경복원기술학회지
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• 제21권4호
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• pp.75-86
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• 2018

This research was thereby made to study and analysis ecological, landscape, and stability qualities of roadside cut Slopes in expressways and national highways that went through revegetation works. Also, evaluation items and framework for integrated assessment of plant structure and restored state for the maintenance were suggested. Following is the summary of the result. firstly, for stabilization of introduced native plant species on roadside cut slops, assessment on the post-project environmental management through long-term monitoring and maintenance works must be made. It signifies a form of authentic recovery and restoration by the native plants. second, current evaluation framework on the test beds is well managed with clear evaluation standards and table while its method of assessing the post management with only test bed results lacks conformity with this study site. Newly developed evaluation framework on the post construction sites is estimated to be used as assessment standards on any roadside construction sites. Third, after site investigation distinction was observed among different revegetating construction types in the long-term perspective. Due to the different duration time of vegetation state between seed-spray measures(degraded in time) and layer-spray measure(maintained), the use of coarse straw-mat mulching work or Coir net was suggested in long term maintenance of cut slopes. forth, segmentation of post environmental assessment is organized into three large categories of "ecological", "stabile", and "landscape" qualities regarding post restoration quality and stability of slope through native plants with which categories marks 50, 30, 20 points of rates. fifth, components of the post environmental assessment were segmented in twelve categories driving results from former experimental construction and newly focused items on site. In the future, it is possible to propose a customized assessment method considering the location and location of construction work if the research on the application of post-environment assessment methods for road construction surface recording is conducted systematically.

• 한국진공학회지
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• 제7권2호
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• pp.88-93
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• 1998

본 연구에서는 기계-화학적 연마(Chemical-Mechanical-Polishing: CMP)공정을 이용 하여 게이트 전극을 가지는 실리콘 전계방출 소자를 제작하였으며, 또한 그 전자방출 특성 을 분석하였다. 실리콘 전계방출 소자를 제작하기 위해 실리콘을 두단계로 이루어진 건식식 각과 산화공정으로 팁을 뾰족하게 만들었으며, 게이트를 형성하기 위하여 고 선택비를 가지 는 CMP공정을 사용하였으며, 연마 시간과 연마 압력의 변화로 게이트 높이와 개구의 직경 을 쉽게 조절할 수 있었다. 또한, CMP공정시 발생되는 디싱(dishing)문제를 산화막 마스킹 을 사용함으로 해결하여 자동 정렬된 게이트전극의 개구를 깨끗하게 형성할 수 있었다. 제 작된 에미터의 높이와 팁끝의 반경은 각각 1.1$\mu$m, 100$\AA$정도이며, 제작된 2809개의 팁 어 레이로 80V의 게이트전압에서 31$\mu$A의 방출전류를 얻을 수 있었다.

• 대순사상논총
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• 제18권
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• pp.149-164
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• 2004

Various social surveys conducted by mass media and government agencies in recent years in Japan suggest that the percentage of those who believe in religion are between twenty and thirty percent. However, more than seventy percent of Japanese visit Shinto shrines or Buddhist temples during the New year period. Although there are varying interpretations on whether Japanese people are religious or not, detailed research shows the existence of certain religious tendencies among Japanese. I base my estimates on research surveys of college students covering a period of almost ten years. It is helpful for understanding the religiosity of the Japanese to differentiate between "clear-cut religion" and "peripheral religious phenomena." The exact boundary between these two categories, however, is difficult to clearly demarcate. "Clear-cut religion" refers here phenomena which are directly related to established religious organizations such as shrine Shinto, Buddhist sects, or Christianity. "Peripheral religious phenomena" covers such phenomena as fortune telling, mystical phenomena, religious customs and similar matters. It is often said that the younger generations are less concerned with religion. Our seven surveys questioning several thousand college students, conducted between 1995 and 2001, show that only between six and seven percent of the students state that they believe in religion. Additionally, the extent of negative attitudes toward religion quite remarkable. On the other hand, students who take part in conventional ritual such as a New year's visit to a shrine or temple and visiting the graves of ancestors amount to about fifty percentage. In spite of the prevailing negative attitude toward religious groups, these students have apparently kept a certain level of interest in religious customs. Moreover, they show a relatively strong interest in fortune telling, mystical phenomena, or supernatural phenomena. The exact degree of a positive attitude toward peripheral religious phenomena differs according to the level of being informed on these matters. As a whole, they largely rely on information gained from their families and local communities. Therefore, we can conclude that there is a degree of transmission of religious culture among younger generations.

• 한국산림과학회지
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• 제112권4호
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• pp.502-514
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• 2023

본 연구는 낙엽송과 리기다소나무 벌채지에 조성된 낙엽송 조림지의 토양 물리·화학적 특성 및 조림목 생장의 장기적인 변화를 이해하고자 수행되었다. 낙엽송 전생임분(춘천, 김천)과 리기다소나무 전생임분(원주, 가평)에 낙엽송 노지묘(1-1)를 3,000본 ha^-1 밀도로 2009-2010년에 식재하였다. 조림 당해연도와 식재 후 3, 7, 11년에 토양 시료(0-20 cm)를 채취하여 물리·화학적 특성을 분석하였으며, 동시에 주기적으로 수고 및 근원경을 측정하였다. 연구 결과, 식재 초기 미사와 점토 함량, 총탄소와 전질소, 유효태인산 농도, 양이온치환용량 등의 토양 특성은 전생임분에 따른 차이를 보였으나, 조림목 생장은 전생임분에 따른 차이를 보이지 않았다. 토양의 화학적 특성은 전반적으로 김천지역이 가장 양호한 반면, 조림목 초기 생장은 가평지역에서 가장 높게 나타났다. 조림 11년 경과 후에는 어린나무가꾸기 작업에 따라 임분밀도가 크게 감소한 원주(1,028본 ha^-1)와 춘천(1,359본 ha^-1)에서 흉고직경이 더 크게 나타났다. 한편 조림 초기 전생임분과 조림지별 토양 특성의 차이는 낙엽송 조림 11년 경과 후 유사하게 변화하였다. 특히 벌채·조림 후 높게 나타났던 모래함량과 유효태인산 농도는 잠재적으로 유기물 유입과 양분 흡수에 의해 크게 감소하였다. 본 연구는 벌채 후 조기 재조림이 양분 용탈을 제한하고 토양 안정화에 기여할 수 있음을 제안하고, 낙엽송 재조림지의 양분 관리에 유용한 정보를 제공한다.

• 한국세라믹학회지
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• 제47권4호
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• pp.312-318
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• 2010

Chulwha pieces collected from Hakbong-ri site in Keryong mountain were studied whether there is reactions or not in each layer to investigate firing condition of glaze, body, Chulwha, engobe of Buncheong ware in the early Chosun Dynasty, 15th~16th Century. As a result of XRD analysis of a Chulwha piece, a main crystal phase was $\alpha$-Quartz and a second was Mullite. It was assumed the firing temperature would be around $1200^{\circ}C$ because a little amount of Mullite was formed in the body and there was no phase transition $\alpha$-Quartz to cristobalite. As a result of ICRM analysis, Chulwha and glaze didn't react and the melted glazes were sunk into the Chunwha particles. The thin layer of glaze was found on the Chulwha layer. As a result, the color of Chulwha layer always came to vivid black. Moreover, Chulwha painting didn't spread over the Buncheong ware, because Chulwha and engobe didn't react. The boundary interface of engobe and body was not clear because they had similar compositions. This shows engobe was composed of more $Al_2O_3$ than body.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 B
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• pp.1203-1205
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• 1993

The use of preformed polymers and their cross-linking have been attempted in order to improve the intrinsic fragility of monolayers and Langmuir-Blodgett(LB) films. The evaluation of the characteristics of LB multi-layer by using AT-cut quartz crystal have been also attempted. From this study, it reveals that the polyether pendants of 2C18VE3 lie at the air-water interface at low surface pressures and are forced down into the subphase when the monolayers are compressed. This caracteristic behavoir of the pendant polyethers is much clear on aqueous PAA and also observed on saturated aqueous NaCl. And the characteristics of LB multi-layers could be evaluated by using AT-cut quartz crystal in situ.

• 한국인터넷방송통신학회논문지
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• 제21권3호
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• pp.151-157
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• 2021

본 논문은 조기퇴직자들의 퇴직금을 충당하는데 있어 최소의 초기 투자금만으로 최대의 재태크로 인한 수익금으로 충당하는 방법을 다룬다. 이 문제에 대해 Guéret et al.은 Mosel 프로그램을, Edvall은 해를 찾아가는 명확한 규칙없이 단지 CPLEX Branch-and-Cut MIP Solver 프로그램을 구현하여 해를 얻었다. 본 논문에서는 이 문제에 대해 만기도래기간이 긴 채권부터 역으로 채권 수를 결정하는 계산식을 제시하고, 채권 만기도래의 연속적 효과를 고려하여 채권 수 최적화를 수행하여 채권 수를 확정하였으며, 부족액은 역으로 1년만기 적금의 원금과 이자로 충당하는 계산식을 제시하였다.

• 한국가구학회지
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• 제12권1호
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• pp.47-55
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• 2001

Violin bridge blank cut from maple wood with good quality has typical pattern of the radial direction in the side edge with minimal dispersion. This experimental study was designed and carried out to examine the effect of the physical and macroscopical characteristics on the compressive creep of violin bridge blank which had been imported from European manufacturer. This research arose from the idea that the maple solid wood with heterogeneous wood density and ray direction in the side edge would have uneven rheological property of violin bridge blank which is supposed to be pressed by the tension of strings. Experimentally, the compressive creep of bridge blank became smaller with the higher density of imported maple wood and showed clear density-dependence for the duration of load under the string tension of 5 kgf. Every bridge blank showed the behavior of primary creep stage(stress stabilization) having logarithmic regression creep curve with high correlation coefficient under the designed stress level. Even though the relationship between compressive creep and ray direction on the side edge of bridge was not so clear contrary to expectation, we could conclude that wood density and ray direction should be the quality decisive factors affecting the acoustical characteristics and performance of the bridge, the core member of violin-family bow instruments.