• Title, Summary, Keyword: 비중

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Study on the Construction of Optical Hydrometer (광학식 비중계 제작에 관한 연구)

  • Euijin Hwang;Jinuk Lee;Myungsoo Kim
    • Journal of the Korean Chemical Society
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    • v.36 no.3
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    • pp.442-445
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    • 1992
  • Optical type hydrometer has been designed and constructed utilizing the fact that the refractive index of solution is varied in accordance with its specific gravity. Optical hydrometer produces the electric singal output with reflection of light in accordance with its specific gravity. This can be applied to continuous monitoring and/or automatic control of the specific gravity of solution. U-shaped glass rod was used a transfer medium of light, and the electronic circuit which utilize phase sensitive detection technique was designed to measure accurately the intensity of light. The specific gravity of sulfuric acid was measured with this hydrometer and the results show good linearity of output signal with its specific gravity.

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꽃사슴에 있어서 소화율 및 소화관내 통과속도의 계절간 차이

  • 김경훈;신향재;이상무;전병태;김창원
    • Korean Deer Journal
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    • no.24
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    • pp.4-11
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    • 1995
  • 꽃사슴에 있어서 계절간 소화율의 차이와 사료의 통과속도와의 관계를 암사슴 4두를 공시하여 겨울과 여름에 각각 실시하였다. 사료의 통과속도는 Cr염색법을 이용하였고, 또한 비중별(0.91, 1.20, 1.55, 2.10g/ml) 통과속도의 차이를 규명하기 위하여 plastic particle(PP)를 이용하여 조사하였다. 건물, 유기물, 조단백질 그리고 NDF의 소화율은 겨울철보다 여름철이 높은 경향이었으나 유의적인 차이는 없었다(P>0.05). 그리고 분중의 경시적인 Cr 회수율과 누적회수율에서 계절간에 차이가 나타나지 않았다. 비중별 회수율에 있어서도 계절간의 차이는 나타나지 않았으나, 비중간의 차이는 유의성 있는 차이(P<0.05)를 보였다. 비중 0.90에서는 모든 사슴이 $6\%$의 미만의 낮은 회수율을 보였으나 1.20이상부터 회수율은 높아졌고, 비중 2.10의 PP는 $75\%$ 이상이 회수되었다. 그리나 비중 1.20과 1.55의 PP는 개체간 변이가 심하게 나타나 최대 $95.1\%$에서 최저$1.3\%$의 범위를 보였다. 반추에 의한 이빨자국을 기초로 반추율을 조사한 결과, 비중 0.90의 PP는 약 $70\%$ 반추율을 보였으나 비중 2.10의 PP는 $5\%$미만의 반추율을 나타내어 비중이 높을수록 반추되지 않고 보다 빨리 2-3위구를 통과하기 때문에 통과속도가 빨랐던 것으로 나타났다.

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Effects of Plant Age and Seed Specific Gravity on Seed Germination of Bupleurum falcatum L. (시호 채종주령(採種株齡) 및 종자비중에 따른 발아특성)

  • Choi, Byoung-Ryourl;Park, Kyeong-Yeol;Kang, Seung-Won
    • Korean Journal of Medicinal Crop Science
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    • v.6 no.2
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    • pp.154-159
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    • 1998
  • This experiment was conducted to investigate the effects of plant age on germination and distribution of seed specific gravity and to find a reason of low germination rate in seeds harvested from young plants, which could be valuable information for the improvement of seed germination in Bupleurum falcatum L. The germination rates of Korean native cultivar were 35% and 4% higher in 1-year-and 2-year-old plants, respectively, than Misshimasaiko (三鳥柴胡) and showed no significant difference between 1- and 2-year-old plants. However, in Misshimasaiko, seed germination rates of 1-year-old plants were $22.7{\sim}23.0%$ lower than those of $2{\sim}3-year-old$ plants. The relative frequency of seeds over 1.00 specific gravity in Misshimasaiko was $33{\sim}34%$ higher in $2{\sim}3-year-old$ plants compared to 52% of 1-year-old plant, but no difference was found between plant ages in Korean native cultivar. Considering varietal difference, the germination rate of seeds with the same specific gravity was not affected by plant age in Korean native cultivar, but in Misshimasaiko it was greatly different between 1-year-old $(5.0{\sim}17.5%)$ and $2{\sim}3-year-old$ plants $(22.5{\sim}55.0)%$. From these results, it was assumed that differences in germination rate among seeds from different plant ages were caused not only by seed specific gravity but also by some other factors.

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Does investment inefficiency increase the proportion of investment property? (기업의 투자 비효율성은 투자부동산의 비중을 높이는가?)

  • Cha, Sang Kwon;Kim, Mi Ok;Lee, Hyun Kyung
    • LHI Journal of Land, Housing, and Urban Affairs
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    • v.11 no.1
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    • pp.49-57
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    • 2020
  • 본 연구는 기업의 투자효율성이 투자부동산 비중에 미치는 영향을 살펴보았다. 경영자의 사적이익 추구현상과 대리인비용이 클수록 나타나는 과잉투자성향이 기업의 투자부동산 비중을 증가시키는지 분석하였다. 이를 위해 2007년부터 2018년까지 유가증권시장과 코스닥시장의 5,781개의 기업-연도를 대상으로 분석하였으며 투자효율성은 McNichols and Stubben(2008)의 연구방법론으로 측정하였다. 분석결과는 다음과 같다. 첫째, 투자 비효율성이 커질수록 기업의 투자부동산 비중이 증가하는 것으로 나타났다. 이는 투자 비효율성이 높을수록 나타나는 대리인비용과 경영자의 제국건설성향이 투자부동산 비중과 유의한 관련성을 갖는다는 것을 의미한다. 둘째, 유가증권시장과 코스닥시장으로 구분하여 분석한 결과에서는 코스닥시장에서 유의성을 확인할 수 없었다. 즉, 투자 비효율성이 커질수록 나타나는 투자부동산의 비중은 유가증권시장에서 관찰되었다. 셋째, 투자 비효율성을 과잉투자와 과소투자로 구분하여 분석한 결과에서는 과잉투자성향이 증가할수록 투자부동산의 비중이 증가하였으나 과소투자와는 관련성이 나타나지 않았다. 이상의 연구결과는 그 간의 선행연구에서 주로 투자부동산과 기업 가치의 관련성에 초점을 맞추었던 반면, 대리인비용과 투자부동산 비중 간의 실증적 증거가 부족한 가운데 추가적인 학문적, 실무적 시사점을 갖는다.

Effect of Egg gravity of Silkworm, Bombyx mori L., on the Hatching and the Practical Hatching Ratio (I) (잠난비중이 부화율에 미치는 영향 ( I ))

  • 손해용;김윤식
    • Journal of Sericultural and Entomological Science
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    • v.20 no.2
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    • pp.6-9
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    • 1978
  • This experiment was attempted to investigate the effect of the specific gravity of silkworm eggs on the hatching and the practical hatching ratio depend upon six egg production companies for two silkworm races and their reciprocal crosses. 1. The hatching and the practical hatching ratio in the specific gravity of medium and heavy eggs were higher than in the specific gravity of light eggs. 2. Compare with Japanese or Chinese mother races each other, it was inclined that the former seems to be higher than the latter on the hatching ratio in the specific gravity of light and medium eggs, but the practical hatching ratio was high only in the specific gravity of light eggs. 3. Chinese mother races were different in the practical and the hatching ratio between the specific gravity of eggs. On the contrary in case of Japanese mother races were no difference for the hatching ratio but difference in the practical hatching ratio between the specific gravity of eggs. 4. On the egg production company, in case of the specific gravity of medium and light eggs, the hatching and the practical hatching ratio were high significance, but no difference in the specific gravity of heavy eggs.

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A Longitudinal Study on the Changes in Individual Local Government's Social Spending in South Korea (기초지방정부 사회복지비 지출비중의 변화요인 탐색)

  • Jang, Dong-Ho
    • Korean Journal of Social Welfare
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    • v.59 no.1
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    • pp.329-351
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    • 2007
  • This study analyzes the changes in individual local government's social spending from 1995 to 2004 in South Korea. Using the pooled time-series and cross-sectional data of 226 basic-level local governments, the resulting analyses of an error correction model are very interesting: First, a rising local population led to an immediate increase in social spending; Secondly, local governments gradually increased social spending when the elderly ratio had been high, but the levels of social spending in the previous year and local economy related spending level had been low. Thirdly, there were no spending changes associated with local elections and partisan politics. Fourthly, both cooperative and competitive intergovernmental relations had the most significant effect on the social spending and reduced geographical disparities in the level of spending across localities. In conclusion, this study suggests that we establish a more comprehensive intergovernmental network which lead to territorial justice in social welfare.

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Gender Difference in Self-Employment Rates In Korea (남녀간 자영업 비중의 격차 분석)

  • Kim, Woo-Yung
    • Journal of Labour Economics
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    • v.24 no.2
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    • pp.1-34
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    • 2001
  • This study analyzes the male-female difference in self-employment rates in Korea using panel data constructed from the Economically Active Population Survey in 1999. Given that most studies on self-employment have focused on male self-employment and have not examined why self-employment rate is usually higher among males than females, this study certainly extends the existing literature on this subject This study consists of two parts. The first part deals with estimating self-employment rates for males and female within a Markov framework. The second part presents decomposition results of the male-female differential in self-employment rates. Major findings of the study are (1) self-employment rate is higher for males than females because entry into self-employment is larger but exit from self-employment is smaller for males than female, (2) higher entry probability for males is due to differences in coefficients of transition probability functions while lower exit probability for males is due to differences in characteristics, (3) a large part of male-female gap in self-employment rates results from differences in being a head of family, marital status and age between males and females.

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우리나라의 경제발전추이와 1만달러시기의 국제비교

  • Korea Petroleum Association
    • Korea Petroleum Association Journal
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    • no.7
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    • pp.77-79
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    • 1996
  • 95년중 우리나라는 1인당 국민소득이 처음으로 1만달러를 넘어 섰으며, 경제규모 (경상GNP)는 4,517억달러로 세계 11위, 교역규모는 2,603억달러로 세계13위(94년기준) 국가로 부상하였음. 경제구조면에서도 농림어업의 비중이 낮아지고 광공업 및 서비스업의 비중이 높아지는 등 산업구조가 고도화되었으며, 최종 소비지출의 비중이 낮아진 반면 설비 및 건설투자의 비중이 높아졌음. 또한 엥겔계수가 낮아지고 노동소득분배율이 높아지는 등 경제구조가 전반적으로 선진국형에 근접해가고 있는 것으로 나타났음. 이와 같은 경제발전에 따라 제조업 근로자의 주당 평균 근로시간, 인구 1만명당 의사수, 주택 보급률, 고등교육기관 학생수 및 연구개발투자액의 대GNP 비중 등 주요사회지표가 크게 호전된 것으로 나타났음. 특히 이중에서도 고등교육기관 학생수 및 연구개발투자액의 대GNP비중등은 우리나라의 높은 교육열등을 반영하여 주요국의 1만달러시기 수준보다 높은 것으로 나타났음.

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Some Morphological Characteristics of Grain and Chaff of Rice Grains Having Different Specific Gravity (벼임실도에 따른 미립과 조곡의 형질에 관한 연구)

  • 최수일;김연진;나종성;김진기
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.27 no.1
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    • pp.28-34
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    • 1982
  • This experiment was conducted to study on some morphological characteristics of rice grain and chaff with specific gravity. The size of grain was greater in grains with heavier specific gravity. Indica varieties were large in length, but short in width and thickness of grain, and was thin in grain form and small in volume of grain compared with Japonica variety. The coefficient of variability was high in grains with lower specific gravity. The accumulation of assimilation product was more influenced with width and thickness rather than length of grain. The percentage of fully ripened grain was high in small size variety. The green rice and imperfect grain showed higher distribution ratio in the lower specific gravity. The chaff of less filled grain had higher content of nitrogen and lower content of potassium and sillicate than the filled.

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The Effects of Labor Force Compositions on the Performance of Korean Venture Businesses (벤처기업의 인력구성이 경영성과에 미치는 영향)

  • Kim, Jong-woon
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.10 no.2
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    • pp.135-142
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    • 2015
  • This paper analyzed the effects of changes in temporary workers on firm performances, and the effects of different workforce portions of business functions on corporate performances, respectively, using Korean venture business survey conduected in 2013. Results show that the performance of venture businesses decreases significantly, as the portion of temporary workers increases, which is more pronounced in small companies than in medium companies. In addition, the portions of workforce for administration, R&D, production, and sales don't have uniform effect on firm performance, where medium companies are affected significantly by the portions of production and sales, while small companies do not show significant relationship. This analysis implies that innovative firms, based on knowledge workers, need to use caution when they plan to increase temporary workers, which may lead to lower performance. However, we need further research for the basic causes of the possible lower performance.

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