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서정대 ( Jung-dae Suh ) 한국중견기업학회 2010 중견기업연구 Vol.1 No.1
본 연구는 기업의 성장에 영향을 미치는 요인들을 파악하고 그러한 요인들이 기업의 규모에 따라 차이가 있는지를 분석하였다 개의 제조업체를 . 600 기업 규모별로 구분하여 설문조사를 하였고 그 결과를 토대로 실증분석 하였다. 규모에 관계없이 전체를 대상으로 분석한 결과, 경영환경 여건, 기업의 내부적 특성, 기업의 전략 등 요인들이 각각 기업의 성장에 유의한 영향을 미치는 것으로 파악되었다. 그러나 기업의 규모를 기준으로 그룹으로 구분하여 각각 동일한 분석을 실시하였을 때에는 위의 경우와 달리, 그룹별로 각각 상이한 결과를 얻었다. 중소기업과 중소기업 범위를 벗어난 중견기업 간에 차이와 중소기업 내에서도 규모 간에 차이를 나타낸 이러한 결과는 해당 기업뿐만 아니라 규모별로 차별적인 정책이 필요하다는 중요한 시사점을 가진다. 본 연구는 분석대상을 상대적으로 적은 수의 제조업체에 국한하고 설문결과를 활용하여 분석하였다는 점에서 연구의 한계를 가진다. 제조업을 포함하거나 그 이외의 업종, 또는 보다 규모가 큰 메크로 데이터, 보다 다양한 변수 등을 활용한 폭 넓고 심층적인 연구가 향후에 지속적으로 이루어지기를 기대한다. This study identifies the determinants of firm growth, focusing on the differences across the size of firm. The survey results of 600 manufacturing firms including SMEs and LEs are used for the empirical test. The results show that the factors affecting firm growth differ not only between SMEs and LEs, but also among the groups of SMEs by size. The results show that three determinants, business environment, firm's characteristics and business strategies, have shown to have significant effects on the growth of firm. However, when dividing the sample into three groups by the employment size, it has shown considerably different results. The determinants of growth are considerably different between SMEs and LEs as well as among SMEs by the size. It is supported according to the results that smaller firms are more sensitive to the fluctuation of business conditions than the larger firms are. It implies that for the smaller firms' stability and growth the government should pay more attention on the factors of macroeconomic stability. And also the results support that the strategies of firms themselves should be changed according to their size and it is suggested that the appropriate government policy measures should be developed according to the size of firm.
서정아(Jung Ah Suh) 한국과학교육학회 2002 한국과학교육학회지 Vol.22 No.3
This study investigates students` preconceptions about measurement theory; repeating measurements, how to handle repeat measurements, measurement errors, and uncertainty. Thirty students in seventh grade participated in this study. Students` conceptions were elicited using observation and interview notes. Half of the students measured only two times, and none of them more than five times. After repeating measurements, seventy seven percent of them selected result according to their feelings, while only thirteen percent of them calculated the mean. Sixty percent of them regarded the main cause of measurement errors as their mistakes, not as the problems of environment or measuring instrument. Most students thought the main reason of various results by different persons or time period as human. Forty percent of them denied the uncertainty of measurement, while thirty three agreed, and most students thought the reason of uncertainty was due to human imperfection. This study showed more than half of the students did not know how to handle repeat measurements, and they regarded the cause of measurement errors as their mistakes. In addition, they thought the main reason of various measuring results and uncertainty as human.
황산염환원균의 발효적 대사특성을 이용한 혐기성처리법에 관한 기초적연구
서정인(Jung In Suh) 한국수처리학회 1999 한국수처리학회지 Vol.7 No.2
In order to the enhancement of the efficient of anaerobic treatment process, the characteristics of fermentative metabolism by sulfidogens were investigated in anaerobic sludge that had been acclimated with glucose under sulfate loads(0 to 0.42 ㎏·SO₄^(2-)/㎥/day), while sulfate was withheld from the each anaerobic sludge that had been fed both glucose and sulfate in the steady-state. With the presence of sulfate, methanogenesis was decreased with increasing sulfate load and conversion ratio of input COD into methane was decreased by 17% at Run 6 (0.4 ㎏·SO₄^(2-)/㎥/day) compared with Run 1 (no sulfate load sludge). However, in the sulfate depletion condition, the conversion ratio of input COD into methane was about 79.3% in all condition. Also, methanogenesis from hydrogen was decreased with increasing sulfate load. However, with sulfate depletion condition, methanogenesis from hydrogen was increased, and contribution ratio of hydrogen to methane reached the maximum at Run 5 (sulfate load was converted 0.31 ㎏·SO₄^(2-)/㎥/day to 0 ㎏·SO₄^(2-)/㎥/day). Also sulfide production was stimulated by propionate, lactate, and pyruvate at sulfate depletion sludge. At the same time, the utilization rate of pyruvate and lactate by sulfidogens was maximized at Run 5. These results showed that some sulfidogen should inhabit by their fermentative metabolism using volatile fatty acids exception of acetate in the absence of sulfate. Thus, fermentative-sulfidogens converted pyruvate, propionate, lactate, etc. to acetate and hydrogen in sulfate depletion condition and then these intermediates were utilized by methanogens.