• Asian-Australasian Journal of Animal Sciences
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• 제28권7호
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• pp.1044-1052
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• 2015

The aim of this modelling study was to investigate the effect of large herd size (and land areas) on walking distances and milking interval (MI), and their impact on milk yield and economic penalties when 50% of the total diets were provided from home grown feed either as pasture or grazeable complementary forage rotation (CFR) in an automatic milking system (AMS). Twelve scenarios consisting of 3 AMS herds (400, 600, 800 cows), 2 levels of pasture utilisation (current AMS utilisation of 15.0 t dry matter [DM]/ha, termed as 'moderate'; optimum pasture utilisation of 19.7 t DM/ha, termed as 'high') and 2 rates of incorporation of grazeable complementary forage system (CFS: 0, 30%; CFS = 65% farm is CFR and 35% of farm is pasture) were investigated. Walking distances, energy loss due to walking, MI, reduction in milk yield and income loss were calculated for each treatment based on information available in the literature. With moderate pasture utilisation and 0% CFR, increasing the herd size from 400 to 800 cows resulted in an increase in total walking distances between the parlour and the paddock from 3.5 to 6.3 km. Consequently, MI increased from 15.2 to 16.4 h with increased herd size from 400 to 800 cows. High pasture utilisation (allowing for an increased stocking density) reduced the total walking distances up to 1 km, thus reduced the MI by up to 0.5 h compared to the moderate pasture, 800 cow herd combination. The high pasture utilisation combined with 30% of the farm in CFR in the farm reduced the total walking distances by up to 1.7 km and MI by up to 0.8 h compared to the moderate pasture and 800 cow herd combination. For moderate pasture utilisation, increasing the herd size from 400 to 800 cows resulted in more dramatic milk yield penalty as yield increasing from c.f. 2.6 and 5.1 kg/cow/d respectively, which incurred a loss of up to $AU 1.9/cow/d. Milk yield losses of 0.61 kg and 0.25 kg for every km increase in total walking distance (voluntary return trip from parlour to paddock) and every one hour increase in MI, respectively. The high pasture utilisation combined with 30% of the farm in CFR in the farm increased milk yield by up to 1.5 kg/cow/d, thereby reducing loss by up to $0.5/cow/d (c.f. the moderate pasture and 800 cow herd scenario). Thus, it was concluded that the successful integration of grazeable CFS with pasture has the potential to improve financial performance compared to the pasture only, large herd, AMS.

• Asian-Australasian Journal of Animal Sciences
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• 제20권1호
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• pp.19-24
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• 2007

Covariance components and genetic parameters of weekly live body weight from hatching to six weeks of age and age of sexual maturation were estimated in a laying type Japanese quail line. The univariate and bivariate animal model analysis included hatching group and sex as fixed effects. Each trait was analysed with animal as random effect to fit the additive direct effect. Additional random effects incorporated in the models were changed according to the trait examined. The best model for a trait was chosen based on a likelihood ratio test, comparing the models with and without maternal additive genetic and maternal permanent environmental effects. Heritability estimates of live-weight at hatch and one to six weeks of age with their standard errors were 0.22${\pm}$0.088, 0.39${\pm}$0.099, 0.31${\pm}$0.086, 0.38${\pm}$0.056, 0.46${\pm}$0.055, 0.50${\pm}$0.059, and 0.56${\pm}$0.062, respectively. Direct heritability value of age of sexual maturation was moderate (0.24${\pm}$0.055). The variances due to permanent environmental effect of dam after one week of age and maternal genetic effect after two weeks of age were not important sources of variation. The correlations between direct and maternal genetic effects were negative and ranged from high to moderate values (-0.21 to -0.83). Among the weekly live weights, genetic correlations were generally high between not only successive but also early and late weightings. It suggests that selection for final weight may be based on early weight records. Genetic correlations between age of sexual maturation and live weights were low, favourable but had high standard errors. These results indicate that selection for high weight will potentially result in lower age of sexual maturation only with accurate determination of breeding values.

• 벤처창업연구
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• 제11권3호
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• pp.87-96
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• 2016

본 연구의 목적은 창업자의 사회적 네트워크의 유대관계의 강도와 다양성이 창업성과에 어떠한 영향을 미치는지 알아보고, 창업자의 창업 경험이 사회적 네트워크와 성과간의 관계에 미치는 영향을 알아보고자 한다. 연구의 가설 검증을 위해 창업자 및 창업기업에 종사하는 구성원을 대상으로 설문조사를 실시하였고 PLS를 통한 경로분석을 실시하였다. 실증적 연구 분석결과 사회적 네트워크의 유대정도는 생산적 성과에 직접적인 영향을 미치지만 창의적인 성과에는 영향을 미치지 않았다. 반면 사회적 네트워크의 다양성은 생산적 성과에 영향을 미치지 않지만, 창의적인 성과에 긍정적인 영향을 미치는 것으로 나타났다. 창업경험의 조절효과는 네트워크의 유대정도와 창업 성과 간의 관계에서 유의하게 나타났으며 사회적 네트워크의 다양성과 성과간의 관계에는 영향을 미치지 않는 것으로 나타났다. 본 연구 결과를 통해 창업가의 사회적 네트워크와 창업경험의 중요성을 인지하고 창업성과를 위한 효율적인 사회적 네트워크 활용을 제시하고자 한다.

• 한국콘텐츠학회논문지
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• 제14권7호
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• pp.196-216
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• 2014

본 연구의 목적은 서울에 거주하는 도시노인의 사회활동, 자아효능감 그리고 심리적 복지감을 분석하는데 있다. 이를 위해 도시노인의 인구사회학적 특성에 따른 차이와 사회활동이 심리적 복지감에 미치는 영향과 이들 영향관계에서 자아효능감의 조절효과를 분석하였다. 연구결과 첫째, 도시노인의 인구사회학적 특성에 따라 심리적 복지감에 부분적 차이가 나타났고 둘째, 직업이 있는 경우, 좋은 건강상태, 낮은 연령, 그리고 사회활동 참여에 대한 높은 인식이 삶의 만족도에 정(+)의 영향을 미쳤고 셋째, 배우자가 있는 경우, 좋은 건강상태, 월생활비가 높은 경우, 그리고 사회활동 참여에 대한 높은 인식이 소외감에 부(-)의 영향을 미쳤고 넷째, 배우자가 있는 경우, 자녀와 동거하는 경우, 좋은 건강상태, 사회활동에 참여하는 시간이 많은 경우, 그리고 사회활동 참여에 대한 높은 인식이 우울감에 부(-)의 영향을 미치고 다섯째, 자아효능감은 사회활동 참여와 소외감과 우울 간의 관계에서 조절역할을 하는 것으로 나타났다.

• 디지털융복합연구
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• 제16권4호
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• pp.69-77
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• 2018

최근 조직은 팀을 중심으로 하는 기업 구조의 변화를 겪고 있다. 따라서 본 연구에서는 팀 리더십의 중심인 공유리더십과 구성원의 혁신행동과의 관계를 살펴보고, 이들의 관계에서 신뢰가 어떠한 조절 역할을 수행하는지를 파악하고자 한다. 이를 위해, 문헌조사를 통해 공유리더십이 혁신행동에 영향을 미칠 것 이라는 연구모형 및 가설을 설정하였다. 또한, 이들의 관계에서 신뢰의 조절효과를 파악하였다. 실증분석을 위해, 대구 경북 지역의 대기업에 종사하는 조직 구성원을 대상으로 설문조사를 진행하였고, 다중회귀분석 및 계층적 회귀분석을 실시하여 가설검증을 실시하였다. 분석결과, 공유리더십은 혁신행동에 유의미한 영향을 미치는 것으로 나타났다. 특히, 구성원간의 신뢰는 공유리더십과 혁신행동의 관계를 조절하는 것으로 나타났다. 이러한 연구 결과는 인적자원의 중요성이 증대되는 현 시점에서의 기업 조직의 주요한 전략적 인적자원활용 방안으로 활용 될 것이다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
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• pp.693-696
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• 1999

Reinforced concrete is, in general, known as high durability construction material under normal environments due to strong alkalinity of cement. It is , however, well known that moderate or minor cracks in reinforced concrete should be most serious causes to deteriorate the durability of RC structures. Furthermore, chloride contents penetrating through unexpected cracks in reinforced concrete bridges get to weaken corrosion resistance of reinforcement steel in concrete and than to accelerate the deterioration of concrete durability. The objective of this experimental research is 1) to evaluate the effect of various corrosion protection system for reinforced concrete specimens with moderate or minor cracks which are exposed to cyclic wet and dry seawater, and then 2) to develop effective corrosion protection system for reinforced concrete bridges under the exposure of various detrimental environments such as seawater, deicing and etc.

• 아동학회지
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• 제30권2호
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• pp.113-127
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• 2009

This study investigated whether children's self-control and sense of humor could moderate negative effects of daily hassles on their school adjustment. Subjects of this study were 880 6th graders (468 boys, 412 girls) in the Seoul metropolitan area. Children reported their daily hassles, school adjustment, self-control, and sense of humor on questionnaires. The collected data were analyzed using descriptive statistics, Pearson's correlation analysis, and moderated regression analysis. Results showed that children who experienced less daily hassles, had higher self-control, and higher sense of humor were well-adjusted in their schools. Children's self-control and sense of humor moderated negative effects of daily hassles on school adjustment of children, although the moderate effect was weak.

• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2007년도 추계학술대회
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• pp.655-660
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• 2007

본 연구는 국내 제조업체를 대상으로 하여, 공급업체 선택기준 요인으로서 원가 요인과 유연성 요인의 적합성을 검증하고, 그들이 공급사슬 성과에 유의한 영향을 미치는가를 확인하는 것을 첫 번째 목표로 한다. 나아가 IT 중 POS, EDI, ERP의 기술들이 그 과정에서 조정적(moderate) 효과를 나타내는가를 실증적으로 검증하고자 한다. 전국에 소재한 제조업체를 표본조사하고 조정적 회귀분석의 방법에 의하여 검증한 결과, 유연성 요인은 공급사슬 성과에 유의한 영향을 미치고 있으며, IT 기술들의 조정효과는 매우 낮은 것으로 나타났다. 이러한 결과는 IT 투자의 '생산성 역설'과 관련이 있는 것으로 볼 수 있다.

• Journal of Nutrition and Health
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• 제24권1호
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• pp.58-65
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• 1991

The effect of habitual alcohol consumption on the nutrient intake. body weight and serum values were studied in 194 upper middle class men aged 35-55yr. living in Seoul. Each subject was interviewed to get information of alcohol and nutrients intake. Blood samples were taken. Mean values for each variable were compared by fertile of alcohol intake. The average alcohol consumption of the subject was 32.2g/day. Most of times foods were taken along with drinks. The subjects preferred food items such as meat. fish, nuts. dry fishes when they drink. High alcohol consumers had a significantly higher intake of calorie. protein, fat. Fe, and riboflavin compared to nondrinkers and moderate drinkers. Body weight was significantly higher in high alcohol drinkers followed by moderate and nondrinker groups. They also showed the higher serum values of triglyceride and r-GTP. High alcohol consumption resulted in an increased intakes of most nutrients especially calorie and fat which leads to higher body weight and higher serum concentrations of triglyceride and r-GTP. Therefore it seems that heavy alcohol drinkers are more prone to obesity and related chronic diseases.

• 한국염색가공학회지
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• 제21권5호
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• pp.27-34
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• 2009

PET fabric was dyed in black shade with disperse dyes of three primary color. The effect of combination ratio of dye concentration and energy type of disperse dye on dyeing and color property of black dyed PET fabric was investigated. Dyeing compatibility of disperse dyes of three primary color on PET was evaluated by comparison of dyeing rates of them. From the results, color property was dependent upon the combination ratio of dye concentration. In order to obtain low lightness ($L^*$) and black color, blue dye should be added enough. S-type disperse dye and $130^{\circ}C$ dyeing was suitable rather than SE-type dyes or $120^{\circ}C$ dyeing. Disperse dyes of three primary color used showed good dyeing compatibility at high dye concentration. Washfastness was fair to moderate and lightfastness was moderate.