• 한국어병학회지
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• 제15권1호
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• pp.37-42
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• 2002

Effect of mercury (Hg) toxicity on survival, growth, feed efficiency and oxygen consumption were examined in the juvenile olive flounder. Paralichthys olivaceus. Fishes were exposed to sublethal concentrations of Hg ranging from 0 to 0.13mg/L for 6 weeks. Hg reduced survival rate in a concentration and exposure period-dependent way and suddenly reduction occurred at Hg concentrations greater than 0.05mg/L after 6 weeks. Growth rate and feed efficiency also significantly decreased at greater than 0.028 and 0.05 mg/L respectively. Oxygen consumption rate was significantly decreased to 25 and 32% than that of the control at the Hg concentration of 0.05 and 0.13 mg/L respectively. These results suggest that Hg toxicity inhibit physiological function including growth, feed efficiency and oxygen consumption in the juvenile olive flounder, resulting in survival failure at high concentration.

• 경영과학
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• 제30권2호
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• pp.79-95
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• 2013

In this study, we empirically examine the impact of win-win growth effort of domestic large firms on their financial performance. Specifically, we classify the financial performance into three aspects such as profitability, stability and efficiency, select corresponding financial ratios to each aspect, and analyze the causal relationship between the firms' win-win growth effort and each of the financial ratios. In addition, we figure out the impact of the firms' win-win growth effort on their stock rate of return. From the analysis, we show that the win-win growth effort has a positive impact on the firms' profitability, stability and stock prices; however, it does not give statistically significant impact on the firms' efficiency with even negative impact on it. These results imply that the firms' win-win growth effort could bring about inefficiency in their business operations, but the effort could increase the firms' profitability and make their financial structure more stable. Furthermore, the effort could enhance the firms' image of leading CSR (corporate social responsibility), which in turn increase their stock values.

• 한국콘텐츠학회논문지
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• 제19권8호
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• pp.151-158
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• 2019

국내 전기 전자 산업이 보유하고 있는 높은 기술력은 국외 시장에서도 인정받고 있지만 현재 주변국과의 기술경쟁 등이 갈수록 심화되어져 가고 있는 상황이다. 따라서 이들 기업들이 경쟁우위를 차지하기 위해서는 무엇보다 운영상의 비효율성을 재정비하여 효율적인 생산 활동을 실시하여야한다. 이에 본 논문에서는 DEA 기업을 통해 국내 고성장 전기 전자사업의 경영효율성을 분석하며 비효율적인 기업의 투사값을 제시하며 벤치마킹의 대상이 될 수 있는 기업들의 참조집합을 확인하고자 한다. 이를 위해 총 20개 고성장 전기 전자기업들의 CCR와 BCC모형의 효율성과 규모수익성(RTS)을 분석하였다. 분석결과 BCC 효율성이 1인 기업은 총 12개, CCR 효율성이 1인 기업은 총 4개 기업으로 나타났다. 그리고 BCC, CCR 효율성이 모두 1인 기업은 총 4개 기업이었다. 또한 기업의 규모수익성은 IRS가 11개 기업, CRS가 6개 기업 그리고 DRS가 3개 기업으로 분석되었으며 참조빈도 분석에서는 BCC모형에서는 4개 기업과 CCR 모형을 통해 4개 기업을 벤치마킹이 할 수 있는 기업으로 제시하였다. 이러한 결과는 동종 산업의 후발 기업들에게 기업의 운영환경을 개선할 수 있는 유용한 정보가 될 것이다.

• 한국유기농업학회지
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• 제16권3호
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• pp.287-298
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• 2008

우분에 왕겨와 볏짚을 1:1, 1:2, 1:3의 부피비율로 혼합한 먹이조건이 지렁이의 생육, 분립생산량, 체조직으로의 유기물 전환율 및 전환효율을 조사하여, 적정 먹이조건을 추정하였다. 1. 우분+왕겨 혼합구가 우분+볏짚 혼합구보다 지렁이의 증체속도, 증식효율 및 분립생산량이 많았다. 특히 우분+왕겨 1:3 혼합비율이 지렁이 생육에 가장 알맞은 먹이조건이었다(Table 2). 2. 우분+왕겨 혼합 구에서 지렁이 체조직으로의 유기물 전환율과 전환효율이 높았던 것은 먹이 중의 휘발성 고형분과 전탄소함량이 높았기 때문이었다(Table 1, 4). 4. 지렁이 분변토는 약알칼리성이고, 전질소함량, 유효인산함량, CEC 및 치환 성 양이온 함량이 높아서 친환경 농자재로 유용하게 활용될 수 있다고 판단된다(Table 5).

• 한국양식학회지
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• 제9권2호
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• pp.179-186
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• 1996

실험실에서 부화시킨 도화새우의 zoea 유생발달에 따른 섭식, 성장, 탈피 및 대사에 관한 에너지수지를 분석하였다. 도화새우의 zoea 전 유생기간중 섭식에 의한 총에너지는 140.88 J이었다. 이중 체성장에 사용된 에너지는 17.07 J이었고 호흡, 탈피 및 배설에 사용된 에너지는 각각 16.22 J, 1.19 J 및 106.40 J이었다. 섭식한 먹이에 대한 동화효율(assimilation efficiency, A/I)은 $24.47\%$였다. 성장으로 전환된 에너지의 총섭식에너지에 대한 백분률인 총성장효율(gross growth efficiency, $K_1$)과 성장으로 전환된 동화에너지에 대한 백분률인 순성장효을 (net growth efficiency, $K_2$)은 각각 $12.96\%$와 $52.96\%$ 였다. 동화에너지가 체성장과 대사에너지에 사용된 것은 각각 $49.51\%$와 $47.04\%$였다.

• Asian-Australasian Journal of Animal Sciences
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• 제11권4호
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• pp.351-362
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• 1998

Microbial growth efficiency in the rumen was studied in sheep given hourly, 31.25 g oaten chaff with either 0.31 and 0.88 g urea or 1.88 and 5.63 g casein (exp. 1) and 33.33 g oaten chaff with 1.04 casein or 0.3, 0.6 and 0.9 g urea or the mixture of the casein and urea (exp. 2). Concentrations of ruminal fluid ammonia increased with increasing nitrogenous supplements. Organic matter digestibility in sacco in the rumen was not different irrespective of N sources. Isoacids and valeric acid increased with increasing ingested casein but decreased with increasing urea intake. Peptide and amino acid pools in ruminal fluid increased with increasing ammonia concentrations (exp. 2) suggesting that proteolytic activity and transportation of peptides and amino acids across microbial membrane of rumen microbes may be regulated by the metabolite mechanism (intracellular amino acids and $NH_4{^+}$, respectively). Densities of total viable and cellulolytic bacteria in ruminal fluid increased with increasing ammonia levels but that of small Entodinia decreased. The density of fungal sporangia growth on oat leaf blades decreased with increasing ammonia concentrations but appeared to remain constant in the presence of casein. Efficiency of net microbial cell synthesis was 15-28% higher when ammonia concentrations increased from 100 to above 200 mg N/l regardless of N sources. In conclusion, supplementation of preformed protein had no effect on rumen digestion and microbial growth efficiency. This could not be accounted for its effect on ruminal fluid ammonia. Increased microbial growth efficiency with increasing ammonia levels may be due to a reduction in the turnover of microbial cells within the rumen.

• 기술혁신연구
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• 제11권2호
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• pp.151-173
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• 2003

This paper analyses the efficiency and productivity of R&D system across time (1991${\sim}$2000) and 16 OECD countries using multi-output and multi-input non-parametric frontier methods such as DEA (data envelopement analysis) and Malmquist productivity indexes. Malmquist productivity indexes are decomposed into two components measures, namely technical change and efficiency change. To calculate R&D efficiency and productivity, we used R&D stock and the number or researchers as R&D input proxies and the number of adjusted SCI papers and U.S. patent applications as R&D output proxies. Empirical result shows that Switzerland, Canada, U.S., Australia's R&D efficiencies are the highest and Korea's R&D productivity growth is the highest in the sample for the period. Technical efficiency growth was a more important source of productivity growth than technological innovation.

• 한국수산과학회지
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• 제49권5호
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• pp.607-611
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• 2016

This study was conducted to investigate the effects of different water temperatures on growth, survival, biochemical composition, and blood physiological parameters of juvenile mandarin fish Siniperca scherzeri. Feed-trained juvenile fish were subjected to four water temperatures (20, 23, 26 and 29℃) with two replicate groups. The fish were fed to apparent satiation twice daily using a formulated diet containing 55% crude protein and 6% crude lipid. After the 8-week feeding trial, survival was >96% in all groups. Weight gain and feed efficiency of fish reared at 26 and 29℃ were higher than those reared at 20℃. The protein efficiency ratio, daily feed intake, and whole body proximate composition were not affected by water temperature. These results indicate that a suitable water temperature range for optimal growth and feed efficiency of juvenile mandarin fish is 26-29℃ under these experimental conditions.

• 대한의생명과학회지
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• 제11권4호
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• pp.421-427
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• 2005

To evaluate the diagnostic significance of p16 overexpression in human hepatocellular carcinoma (HCC), we analyzed p16 status and growth inhibitory patterns by p16 overexpression in HCC cell lines having different pRE status. SKHep1 and SNU449 cells show homozygous deletion of p16. The p16 gene in SNU398 cell is inactivated at posttranscription level. Adenovira1-p16 (Ad-p16) infection inhibits the cell growth in Hep3B, SNU398, and SNU449. Failure of growth inhibition in SKHepl results from the low transduction efficiency of adenovirus. The p16-mediated growth inhibition shows G 1 phase arrest in pRE-positive SNU449 but not in pRE-negative Hep3B. These results suggest that therapeutic efficacy of p16 gene might be considered on the transduction efficiency and the toxicity of adenoviral vector. Beside, growth inhibitory effect of p16 could be exerted through either pRE-dependent or -independent pathway.

• 한국환경과학회지
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• 제28권11호
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• pp.1019-1025
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• 2019

The aim of this study was to analyze the light traits in a solar light-collector device and its effects on lettuce growth at an early growth stage. The three hyper parameters used were the reflector diameter (2 cm and 4 cm), coating inside the reflector (chrome-coated, non-coated) and distance from the light fiber (15 cm and 20 cm). The results showed that light efficiency, which is the ratio of light intensity inside the fiber to the solar intensity, improved by 41.1 % when using a 2 cm diameter chrome-coated reflector at a distance of 15 cm from the light fiber; whereas it only improved by 20.6% when a non-coated reflector was used. As the reflector size was increased to 4 cm, the light efficiency for the coated and non-coated reflectors increased by 28.5 % and 26.4 %, respectively, hence, no significant difference was observed. When the light fiber was placed at a distance of 20 cm, the increase in light efficiency with coating treatment was 8 % higher than without coating treatment. We also compared the efficiency of light-fiber treatment with that of LED treatment in our lettuce nursery, and observed that the plants exhibited better growth with light-fiber treatment. We observed an average increase of 1.7 cm in leaf height, $7cm^2/plant$ increase in leaf area, and 32 mm increase in root length upon light-fiber treatment as opposed to those observed with LED treatment. These findings indicate that the collector light-fiber is economically feasible and it improves lettuce growth compared with the LED treatment.