• Earthquakes and Structures
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• 제23권3호
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• pp.283-295
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• 2022

Seismic design codes permit the use of Equivalent Static Analysis of buildings considering torsional eccentricity e with dynamic amplification factors on structural eccentricity and some accidental eccentricity. Estimation of e in buildings is not addressed in codes. This paper presents a simple approximate method to estimate e in RC Moment Frame and RC Structural Wall buildings, which required no detailed structural analysis. The method is validated by 3D analysis (using commercial structural analysis software) of a spectrum of building. Results show that dynamic amplification factor should be applied on torsional eccentricity when performing Response Spectrum Analysis also. Also, irregular or mixed modes of oscillation arise in torsionally unsymmetrical buildings owing to poor geometric distribution of mass and stiffness in plan, which is captured by the mass participation ratio. These irregular modes can be avoided in buildings of any plan geometry by limiting the two critical parameters (normalised torsional eccentricity e/B and Natural Period Ratio 𝜏 =T_𝜃/T, where B is building lateral dimension, T_𝜃 uncoupled torsional natural period and T uncoupled translational natural period). Suggestions are made for new building code provisions.

• 한방비만학회지
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• 제16권2호
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• pp.116-123
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• 2016

Objectives: The purpose of this study was to investigate the effects of modified fasting therapy on the changes of body compositions. Methods: We analyzed the medical records of 33 patients, who carried out modified fasting therapy at Dunsan Korean Medicine Hospital of Daejeon University from January 1st, 2011 to December 30th, 2015. They went through reducing food intakes period (7 days), fasting period (14 days) and refeeding period (14 days). Body compositions (weight, body mass index, skeletal muscle mass, percent body fat, basal metabolic rate, waist-hip ratio, visceral fat area) were reviewed at each state. And then the data was analyzed. Results: The body composition values (weight, body mass index [BMI], skeletal muscle mass, percent body fat, basal metabolic rate, waist-hip ratio, visceral fat area) decreased during the fasting therapy period, as a whole. The weight, BMI, percent body fat and visceral fat area decreased during the reducing food intakes period, the fasting period and the refeeding period. The skeletal muscle mass and basal metabolic rate significantly decreased during the reducing food intakes period and the fasting period, and insignificantly increased during the refeeding period. Conclusions: Results from this investigation showed that modified fasting therapy using fermented herbal medicine have positive effects on changes of body compositions.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2011년도 학술발표회
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• pp.252-252
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• 2011

Rainfall-runoff models are calibrated and validated by using a same data set such as observations. The past climate change effects the present rainfall pattern and also will effect on the future. To predict rainfall-runoff more preciously we have to consider the climate change pattern in the past, present and the future time. Thus, in this study, the climate change represents changes in mean precipitation and standard deviation in different patterns. In some river basins, there is no enough length of data for the analysis. Therefore, we have to generate the synthetic data using proper distribution for calculation of precipitation based on the observed data. In this study, Kajiyama model is used to analyze the runoff in the dry and the wet period, separately. Mean and standard deviation are used for generating precipitation from the gamma distribution. Twenty hypothetical scenarios are considered to show the climate change conditions. The mean precipitation are changed by -20%, -10%, 0%, +10% and +20% for the data generation with keeping the standard deviation constant in the wet and the dry period respectively. Similarly, the standard deviations of precipitation are changed by -20%, -10%, 0%, +10% and +20% keeping the mean value of precipitation constant for the wet and the dry period sequentially. In the wet period, when the standard deviation value varies then the mean NSE ratio is more fluctuate rather than the dry period. On the other hand, the mean NSE ratio in some extent is more fluctuate in the wet period and sometimes in the dry period, if the mean value of precipitation varies while keeping the standard deviation constant.

• 한국지진공학회논문집
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• 제27권1호
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• pp.1-12
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• 2023

Structures of high-rise buildings are less prone to earthquake damage. This is because the response acceleration of high-rise buildings appears to be small by generally occurring short-period ground motions. However, due to the increased construction volume of high-rise buildings and concerns about large earthquakes, long-period ground motions have begun to be recognized as a risk factor for high-rise buildings. Ground motion observed on each floor of the building is affected by the eigenmode of the building because the ground motion input to the building is amplified in the frequency range corresponding to the building's natural frequency. In addition, long-period components of ground motion are more easily transmitted to the floor or attached components of the building than short-period components. As such, high-rise buildings and non-structural components pose concerns about long-period ground motion. However, the criteria (ASCE 7-22) underestimate the acceleration response of buildings and non-structural components caused by long-period ground motion. Therefore, the characteristics of buildings' acceleration response amplification ratio and non-structural components were reviewed in this study through shake table tests considering long-period ground motions.

• 대한환경공학회지
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• 제34권5호
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• pp.351-358
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• 2012

Microcystis sp.의 부패과정에서 수중으로 용출되는 AOM 특성과 염소 이들에서의 disinfection by-products (DBPs) 생성특성을 조사하였다. 수중으로 용출된 EOM과 cell + IOM에서의 염소 DBPs 생성특성을 조사한 결과, EOM은 보관기간 초기부터 지속적으로 증가하였으나 cell + IOM의 경우는 급격한 감소경향을 나타내었으며, 생성된 DBPs 중 HAAFP가 가장 높은 생성비율을 나타내었다. 또한, 이 때의 DBP 구성종들의 변화를 살펴본 결과, HAA 구성종들의 경우는 EOM에서는 di-HAA 구성종들의 비율은 점점 감소하였고 tri-HAA 구성종들의 비율은 점점 증가하였다. 그러나 cell + IOM의 경우는 EOM의 경우와는 반대 경향을 나타내었다. 또한, HAN 구성종들의 경우는 EOM과 cell + IOM 모두 di-HAN 구성종들의 생성비율이 월등히 높았다.

• 한국융합학회논문지
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• 제9권11호
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• pp.353-361
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• 2018

본 연구는 기업의 부동산보유비중이 기업가치에 어떤 영향을 미치는가에 대하여 코스피시장기업과 코스닥시장기업을 대상으로 분석하였다. 분석기간은 금융위기 기간(2007~2008년), 금융위기 직후기간(2009~2011년), IFRS 도입 이후 기간(2012~2016년)이며, 코스피 2761개 기업연도, 코스닥 3719개 기업연도의 표본을 사용하였다. 회귀분석 결과 전체적으로 기업의 부동산보유비중이 높을수록 기업가치는 음(-)의 관련성을 갖고 있었고, 이를 각 시장별로 비교해 보면 금융위기 기간 중에는 코스피기업과 코스닥기업 모두 통계적으로 유의한 영향을 미치지 않았으며, 금융위기 직후에는 코스닥기업이 코스피기업에 비해 기업가치에 더 큰 음(-)의 영향을 미쳤으나 IFRS도입 이후 최근까지는 코스피기업이 코스닥기업에 비해 기업가치에 더 큰 음(-)의 영향을 미쳤다. 따라서 각 기업은 그 기업에서의 적정한 부동산보유비중 정도를 파악하는데 보다 많은 관심을 가져야 할 것이고 각 기업이 보유한 부동산의 최유효활용방안에 대한 분석과 결정을 끊임없이 해야 할 것으로 판단된다. 본 연구는 부동산보유비중의 기업가치 관련성에 대하여 기간을 3개로 구분하여 각각의 기간에 대하여 코스피시장 기업과 코스닥시장기업에 따른 그 영향정도를 각각 비교한 점에서 차별성을 갖는다. 향후 기업의 부동산보유비중에 영향을 미치는 요인을 포함하는 연구를 희망한다.

• 한방재활의학과학회지
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• 제21권3호
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• pp.33-43
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• 2011

Objectives : The purpose of this study was to investigate the influence of modified fasting therapy using fermented herbal medicine on the changes of body compositions. Methods : This study was carried out on 11 patients who carried out modified fasting therapy using fermented herbal medicine. They went through reducing food intakes period(7 days), fasting period(10~14 days) and refeeding period(10~14 days). Body compositions(weight, BMI(body mass index), skeletal muscle mass, body fat mass, percent body fat, basal metabolic rate, waist-hip ratio, visceral fat area) were measured at each state. And then the data was analyzed. Results : 1. The weight and BMI decreased during the reducing food intakes period and the fasting period, and increased during the refeeding period. But the weight and BMI decreased during the fasting therapy period, as a whole. 2. The skeletal muscle mass decreased during the fasting period and increased during the refeeding period. As the final outcome, for the whole fasting therapy period, decrease of skeletal muscle mass didn't show significance. The body fat mass and percent body fat decreased during the reducing food intakes period, the fasting period and the refeeding period. 3. The basal metabolic rate decreased during the fasting period and increased during the refeeding period. As the final outcome, for the whole fasting therapy period, decrease of basal metabolic rate didn't show significance. 4. The waist-hip ratio decreased during the fasting period and the refeeding period. The visceral fat area decreased during the fasting period and refeeding period. Conclusions : Results from this investigation showed that modified fasting therapy using fermented herbal medicine have positive effects on changes of body compositions. This results are expected to compensate the defects of existing fasting therapy.

• 한국환경복원기술학회지
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• 제10권2호
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• pp.54-60
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• 2007

This study was conducted to investigate growth characteristics of irrigation period of greenary mats focused on management as a material to apply on rooftop. Using Sedum kamtschaticum, Sedum takesimense, Sedum reflexum, Sedum album and Sedum burrito greenary mats were made. The irrigation periods were every 3 days, 7 days, and 10 days after made each greenary mats.1. All treatments on survival ratio of 5 Sedum species were over 96%. Especially, new individuals were emerged from naturally detached leaves. 2. Growth of S. kamtschaticum, S. takesimense, S. reflexum were good on 7 day irrigation treatment. 3. The highest covering ratio of S. burrito was 3 day irrigation treatment, and the hightest of the others were 7 day irrigation treatment. Considerations for species selection, mixture, ratio and management were obtained from this study.

• 화훼연구
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• 제18권4호
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• pp.271-277
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• 2010

본 연구는 춘란 야생 변이종의 육종을 위한 기초 자료를 얻고자 실시하였으며, 야생종의 개화시기를 꽃봉오리, 반개화, 개화, 개화 후 10일, 개화 후 20일의 5단계로 나누어 자가 수분시킨 후 삭과의 형태적 특성과 발아율을 조사한 결과이다. 착과율은 개화 후 20일에 교배한 것에서 100%로 가장 높았고, 삭과의 무게는 반개화 때 교배한 것이 가장 무거웠다. 5단계로 나누어 발아율을 조사한 결과 반개화에서 가장 높게 나타났으며, 교배 후 채종일수를 150일, 165일, 180일의 3단계로 달리하여 발아율을 조사한 결과에서는 교배 후 채종일수를 150일에 파종한 종자에서 5%로 가장 높게 나타났다. NaOCl 처리를 통한 발아율을 조사한 결과에서는 2%로 처리한 것에서 53.3%의 발아율을 보여 가장 좋은 결과를 나타내었다.

• 한국정밀공학회지
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• 제16권8호
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• pp.178-185
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• 1999

In tool condition monitoring systems, parameters should be set to a certain threshold. In many cases, however, the threshold is dependent on cutting conditions, especially the radial immersion ratio. In this presented is a method of on-line estimation of the radial immersion ratio in face milling. When a tooth finishes sweeping, a sudden drop of cutting force occurs. The force drop is equal to the cutting force that acting on a tooth at the swept angle of cut and can be acquired from cutting force signals in feed and cross-feed directions. Average cutting force per tooth period can also be calculated from cutting force signals in two directions. The ratio to cutting forces in two directions acting on a tooth at a certain swept angle of cut and the ratio of average cutting forces in two directions per tooth period are functions of the swept angle of cut and the ratio of radial to tangential cutting forces. Using these parameters, the radial immersion ratio is estimated. Various experiments are performed to verify the proposed method. The results show that the radial immersion ratio can be estimated by this method regardless of other cutting conditions.