• 한국터널지하공간학회 논문집
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• 제16권3호
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• pp.299-310
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• 2014

국가적으로 국토의 효율적 활용과 친환경성 등으로 인해 터널과 같은 지하공간 건설이 필요하다. 친환경적 요소의 중요성을 감안할 때, 산악지에 형성되는 도로건설에 대해 2-아치 및 대단면 터널로 계획되나 경제성, 시공성, 공사기간, 유지관리 등의 문제점을 가지고 있다. 따라서 본 연구에서는 2차로의 국도터널을 기준으로 현장조건과 지반조건을 고려하여 터널별 이격거리와 토피고를 변화시켜 경험식과 수치해석적으로 필라부의 안전성을 평가하였으며, 해석 프로그램으로 유한요소법을 적용한 Plaxis 2D를 활용하여 터널의 최소 필라폭 선정과 전체적인 터널의 거동특성을 분석하였다. 분석결과, Tie-Bolt에 의한 필라보강은 연직하중을 분산시켜 안전적인 근접병렬터널 계획이 가능하며, 터널 필라의 거동은 현장계측 결과와 잘 일치하는 것으로 나타났으며, 지반조건에 따라 터널 필라폭을 축소시킨다면 이전의 터널에 비해 효율적인 터널 활용이 가능하다.

• 한국구조물진단유지관리공학회 논문집
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• 제19권2호
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• pp.117-124
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• 2015

건설분야에서 이산화탄소를 저감하기 위해 최근들어 친환경 혼화재료가 많이 사용되고 있다. 또한 콘크리트의 취성파괴를 보완하기 위해 다양한 섬유재의 사용이 고려되고 있다. 본 연구에서는 Rice Ash Husk를 10% 및 20% 치환한 콘크리트를 제조하였으며, 천연섬유 (코코넛 섬유)를 0.125%, 0.250%, 0.375% 혼입하면서 역학적 특성을 평가하였다. 평가를 위해 압축강도, 쪼갬인장강도, 휨강도, 내충격성, 부착강도 등이 평가되었으며, 휨부재의 하중에 따른 균열 및 변위를 분석하였다. RHA를 첨가한 콘크리트는 압축강도를 효과적으로 개선하였으며, 섬유재를 0.125%를 첨가하였을 때, 인장강도, 연성증가 그리고 균열저항성 등이 뚜렷하게 개선되었다. RHA 및 첨연섬유는 자원의 재활용 뿐 아니라 콘크리트의 성능도 개선할 수 있으므로 효과적인 건설재료라고 판단된다.

• 한국주거학회논문집
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• 제21권5호
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• pp.13-22
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• 2010

This study has the purpose to reveal the differences of residents' using behaviors of living facilities at 3 complexes. The physical characteristics of the complexes have been investigated by a literature study and field survey. In addition, questionnaires were answered by residents on living facilities using behavior on community environment. The tools of analysis are frequency, percentage, and cross tabulation using SPSS WIN 12.0 program. Followings are the results of the study. 1) The developmental concept of 3 complexes maintained its initial identity. (1) The residence-oriented complex, having wider residential space, had better downtown access and more convenient facilities for daily life. (2) The residence-government mixed complex, constructed with an eco-friendly concept, had wider green and public service space and good downtown access but on the other hand, had less convenience facilities because of a short period from construction. (3) The residence-industry mixed complex, located in sub-urbanity and conceding more land for industries, had poor access to downtown but had more convenient facilities for workers' use. 2) The most frequently visited convenience facilities were shopping facilities, large or small, and banks, and activities were commonly done in the complex or adjacent area. This means it is recommended that the developer of the new complex locate convenience facilities in multi-core concentration types or street types rather than one-core concentration types.

• 품질경영학회지
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• 제46권3호
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• pp.739-752
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• 2018

Purpose: The purpose of this study was to investigate the relationship between kiln processing parameters and NOx emissions that occur in the sintering and calcination steps of the cement manufacturing process and to derive the main factors responsible for producing emissions outside emission limit criteria, as determined by category models and classification rules, using data mining techniques. The results from this study are expected to be useful as guidelines for NOx emission control standards. Methods: Data were collected from Precalciner Kiln No.3 used in one of the domestic cement plants in Korea. Thirty-four independent variables affecting NOx generation and dependent variables that exceeded or were below the NOx emiision limit (>1 and <0, respectively) were examined during kiln processing. These data were used to construct a detection model of NOx emission, in which emissions exceeded or were below the set limits. The model was validated using SPSS MODELER 18.0, artificial neural network, decision treee (C5.0), and logistic regression analysis data mining techniques. Results: The decision tree (C5.0) algorithm best represented NOx emission behavior and was used to identify 10 processing variables that resulted in NOx emissions outside limit criteria. Conclusion: The results of this study indicate that the decision tree (C5.0) can be applied for real-time monitoring and management of NOx emissions during the cement firing process to satisfy NOx emission control standards and to provide for a more eco-friendly cement product.

• 복식
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• 제62권2호
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• pp.87-102
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• 2012

The purpose of this study is to identify conceptual constructs of well-being consciousness and appearance management behaviors, and to examine the effects of these two variables on attitudes toward Korean herbal cosmetics for Korean and Japanese consumers. A survey was carried out among female consumers between the ages of 20 and 50, and a total of 500 responses were analyzed by descriptive analysis, reliability test, t-test, and confirmatory factor analysis, structural equation modeling and multi group analysis. The results of this study were as follows: 1) The result of CFA and the reliability test on well-being consciousness and appearance management of Korean and Japanese respondents clearly showed factorial structures on each of the variant assessments. 2) In regards to the well-being consciousness, Korean and Japanese respondents highly tended to perceive well-being as a benefit to the physical health and an eco-friendly lifestyle respectively. In the area of appearance management, Korean and Japanese respondents had similar patterns that showed high scores of skin care and weight control. Both Korean and Japanese consumers showed favorable attitudes toward Korean herbal cosmetic products. 3) The consumers' well-being consciousness revealed to have positive influences on appearance management behavior. Both well-being consciousness and appearance management positively influenced attitudes toward Korean herbal cosmetics. 4) As a result of MGA, the well-being consciousness had more positive impacts on Korean respondents' attitudes toward Korean herbal cosmetics than the appearance management variable when compared to the Japanese respondents. On the other hand, appearance management had more positive impacts on Japanese respondents' attitudes to-ward Korean herbal cosmetics than well-being consciousness when compared to the Korean respondents. These results suggest that differentiated marketing strategies for Korean herbal cosmetics are crucial when targeting Korean and Japanese consumers.

• 한국콘텐츠학회논문지
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• 제17권10호
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• pp.161-170
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• 2017

한국 정부는 매장지의 부족으로 인해 추모공원의 경우 제한된 시간동안 매장을 하고 기한이 끝나면 유골을 화장하여 처리하는 방법을 택하고 있다. 본 연구에서 제안하는 새로운 묘지 디자인은 한국의 도시권에서 한정된 매장지에 대한 체계적이고 효과적인 해결방안이 될 수 있다. 목적에 맞는 묘지 디자인 개발을 위해 게로[1] 의 FBS 모델을 이용하였다. 이 모델은 기능, 행위, 구조를 중심으로 동적인 성격의 맥락을 포함하고 있다. 이 연구는 단순한 묘지의 공학적 건설에 관심을 두기보다는 환경친화적 묘지라는 새로운 묘지 개념을 발전시키고자 한다. 즉, 종래의 단순한 묘지 기능에서 자연공원의 기능을 부가하기 위한 디자인 모형을 제시하며 이를 통해 지속 가능한 묘지 건설을 위한 새로운 비지니스 모델을 제시하고자 한다.

• 한국습지학회지
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• 제14권2호
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• pp.289-301
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• 2012

조석의 영향에 의해 해수의 유 출입이 용이한 해수호수를 친수 친환경으로 조성하는 계획이 인천 송도에서 수행되었다. 본 연구는 조석의 영향을 받는 해수호수의 수리동역학적 거동을 분석하기 위해서 1차원 수치모형인 CEA모형과 2차원 수치모형인 FLOW2DH를 이용하여 수로의 폭에 따라서 변화하는 해수호수 내의 수위 및 유속을 계산하였다. 연구 결과, CEA모형을 이용하여 수로의 적정 폭은 100.0m로 선정되었고, 외해 조위와 인공호수 수위의 지체시간과 수로 내 최대 유속이 계산하였다. 이 결과를 FLOW2DH와 연동하여 해수호수 내의 수위 및 유속을 각각 선정된 관측점에 대하여 비교 분석하였다. 또한, 인공호수의 유지관리 측면에서 수문이 설치된 경우에 대하여 수치모형 실험을 추가하여 수문이 설치되지 않은 경우보다 유속이 창조 시 약 20%, 낙조 시 약 50% 감소하는 효과를 얻었다.

• 한국식품조리과학회지
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• 제29권2호
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• pp.169-175
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• 2013

The purpose of this study was to provide the basic information necessary to efficiently run a coffee shop. It comparatively analyzes the relative importance and satisfaction of side menu selection characteristics through analyses on customer importance-satisfaction when selecting a side menu as well as their usage behavior of the side menu at coffee shops. According to reason price the analysis result on the differences in the coffee shop side menu importance and satisfaction, there was a difference because the importance of selecting a side menu was higher for the attributes of taste, health, packing & appearance, economics and personnel service compared to satisfaction among which the price of a side menu was found to be the top priority for improvement. The significance of coffee shop side menu for the respondents prior to usage as well as their satisfaction after usage was evaluated in order to comparatively analyze the relative importance and achievement of each characteristic through the IPA. The result indicated that the variables positioned in the Concentrate Here area (II) were related to economic feasibility such as reasonable price, appropriate price of set menu, telecommunication company affiliated service and coupon usage and point accumulation. As for the Keep up the Good Work area (I), there were many variables regarding personnel service including taste of side menu, blending with coffee, clean packing, clean packaging, staff's side menu knowledge, staff's quick response, staff's politeness and staff's sincere response. As for the variables in the Low Priority area (III), health variables on health such as nutritional value, eco-friendly food materials and calories were observed.

• Mycobiology
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• 제47권3호
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• pp.308-318
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• 2019

Bio-sulfur can be produced in the process of desulfurization from a landfill and collected by some microorganism such as Thiobacillus sp. as a sulfur element. In order to investigate practical use of bio-sulfur as an agent for controlling plant disease, in vitro antifungal activity of bio-sulfur was tested against Colletotrichum orbiculare known to cause cucumber anthracnose. Efficacy of bio-sulfur for suppressing anthracnose disease was also evaluated in vivo using cucumber leaves. Mycelial growth of C. orbiculare on medium containing bio-sulfur was inhibited. Disease severity of cucumber leaves pre-treated with bio-sulfur was significantly decreased compared to that of untreated ones. To illustrate how bio-sulfur could suppress anthracnose disease, structures of cucumber leaves infected with C. orbiculare were observed under a fluorescent microscope and a scanning electron microscope (SEM). Cucumber leaves pre-treated with bio-sulfur showed a low rate of appressorium formation whereas untreated ones showed abundant appressoria. Shrunk fungal hyphae were mostly observed on bio-sulfur-pretreated leaves by SEM. Similar results were observed on leaves pre-treated with a commercial fungicide Benomyl(R). These results suggest that inhibition of appressorium formation of C. orbiculare by bio-sulfur may contribute to its suppression of cucumber anthracnose.

• 한국해양공학회지
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• 제35권5호
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• pp.327-335
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• 2021

Microcracks can rapidly grow and develop in high-strength steels used in offshore structures. It is important to render these microcracks harmless to ensure the safety and reliability of offshore structures. Here, the dependence of the aspect ratio (As) of the maximum depth of harmless crack (a_hlm) was evaluated under three different conditions considering the threshold stress intensity factor (Δk_th) and residual stress of offshore structural steel F690. The threshold stress intensity factor and fatigue limit of fatigue crack propagation, dependent on crack dimensions, were evaluated using Ando's equation, which considers the plastic behavior of fatigue and the stress ratio. a_hlm by peening was analyzed using the relationship between Δk_th obtained by Ando's equation and Δk_th obtained by the sum of applied stress and residual stress. The plate specimen had a width 2W = 12 mm and thickness t = 20 mm, and four value of As were considered: 1.0, 0.6, 0.3, and 0.1. The a_hlm was larger as the compressive residual stress distribution increased. Additionally, an increase in the values of As and Δk_th(l) led to a larger a_hlm. With a safety factor (N) of 2.0, the long-term safety and reliability of structures constructed using F690 can be secured with needle peening. It is necessary to apply a more sensitive non-destructive inspection technique as a non-destructive inspection method for crack detection could not be used to observe fatigue cracks that reduced the fatigue limit of smooth specimens by 50% in the three types of residual stresses considered. The usefulness of non-destructive inspection and non-damaging techniques was reviewed based on the relationship between a_hlm, a_NDI (minimum crack depth detectable in non-destructive inspection), a_{cr N} (crack depth that reduces the fatigue limit to 1/N), and As.