• Journal of Microbiology and Biotechnology
• /
• 제20권12호
• /
• pp.1724-1734
• /
• 2010

A phosphate-solubilizing bacterial strain isolated from Hippophae rhamnoides rhizosphere was identified as Rahnella sp. based on its phenotypic features and 16S rRNA gene sequence. The bacterial strain showed the growth characteristics of a cold-adapted psychrotroph, with the multiple plant growth-promoting traits of inorganic and organic phosphate solubilization, 1-aminocyclopropane-1-carboxylate-deaminase activity, ammonia generation, and siderophore production. The strain also produced indole-3-acetic acid, indole-3-acetaldehyde, indole-3-acetamide, indole-3-acetonitrile, indole-3-lactic acid, and indole-3-pyruvic acid in tryptophan-supplemented nutrient broth. Gluconic, citric and isocitric acids were the major organic acids detected during tricalcium phosphate solubilization. A rifampicin-resistant mutant of the strain exhibited high rhizosphere competence without disturbance to the resident microbial populations in pea rhizosphere. Seed bacterization with a charcoal-based inoculum significantly increased growth in barley, chickpea, pea, and maize under the controlled environment. Microplot testing of the inoculum at two different locations in pea also showed significant increase in growth and yield. The attributes of cold-tolerance, high rhizosphere competence, and broad-spectrum plant growth-promoting activity exhibited the potential of Rahnella sp. BIHB 783 for increasing agriculture productivity.

• 기술혁신학회지
• /
• 제4권1호
• /
• pp.79-95
• /
• 2001

This paper examines the effects of information telecommunication (IT) capital and R&D stock variation on the growth of Korean industry, using a time series approach. Most specifically, we apply the Granger causality and impulse response analysis to our examination of Koreas industrial growth, IT capital, and R&D stocks. The Johansen co-integration test is performed in order to analyze long-term relations among these variables. This research explores the way in which IT capital and R&D stocks variation from economic shocks affects the growth of Koreas industrial sector. The effects are ambiguous, however, across industrial sectors. An impulse response function analysis shows that the effects of IT capital and R&D stock fluctuations in each industrial sector are presented for different time periods.

• 산업공학
• /
• 제21권3호
• /
• pp.312-321
• /
• 2008

The productivity increase by technological advance is the biggest driving force of economic growth. In this paper, we investigate the inputs and outputs of the manufacturing and service industries in Korea. We also estimate the total and partial factor productivities of both industries using the Solow model and the Kendrick model. Finally, we analyze the contribution of each input factor to industrial growth.

• International Journal of Industrial Entomology and Biomaterials
• /
• 제33권2호
• /
• pp.59-62
• /
• 2016

Many insects have gained increasing attention as an alternative protein for humans. Among those, the two-spotted cricket, Gryllus bimaculatus (Orthoptera: Gryllidae), was recently approved as a general food ingredient by the Korean Ministry of Food and Drug Safety. For industrial utilization of G. bimaculatus, mass rearing techniques and production system should be standardized first. In this study, we investigated the effects of five different feeds on the growth and development of G. bimaculatus. Feed is the one of the key factors that has considerable effects on rearing insects. With five different kinds of feed on $1^{st}$, $3^{rd}$, and $5^{th}$ instar nymphs, the change of survival rate, body weight were monitored up to eight wk after hatching. We concluded that 50% of soybean flour, 20% of corn powder, 10% of rice bran, 9% of milk serum, 10% of rice flour, 0.5% of microorganisms, and 0.5% of multivitamins and minerals (diet C) was the best mix for promoting growth and development of $3^{rd}$ instar nymphs compared to the control diet.

• 한국기술혁신학회:학술대회논문집
• /
• 한국기술혁신학회 2003년도 춘계학술대회
• /
• pp.5-17
• /
• 2003

This paper examines the effects of IT technology capital and R&D stock's variation on the growth of Korea's industries with the empirical approaches. We analyze the Granger causality and Impulse response function analysis among the Korea's industrial real output, IT technology capital, and R&D stocks. When it comes to this research conclusion, we know that IT technology capital and R&D stock's shocks affect the growth of Korea's industrial sector in terms of increasing in the real output growth rate.

• Journal of Welding and Joining
• /
• 제35권1호
• /
• pp.61-67
• /
• 2017

Recent studies on the fatigue assessment of high strength steel weld based on the fracture mechanics have frequently raised the problems related to the conservatism in the fatigue crack growth rate specified in the relevant design code. The purpose of this study is to evaluate the effect of the fatigue crack growth parameter on the fatigue life for the low carbon steel weld. In order to do it, the fatigue tests with the constant stress ratio were performed to evaluate the fatigue crack growth rate in the butt weld of SM490. And the fatigue crack growth parameters of the weld were evaluated in accordance with ASTM E647. From the comparative fatigue assessment results, it was found that the fatigue crack growth rate specified in the relevant design code was too conservative to estimate the residual fatigue life of welded structure. So, in order to get the more reliable results, it was recommended that the fatigue life estimation based on the fracture mechanics be performed with the fatigue crack growth parameter specified by test.

• 한국산학기술학회논문지
• /
• 제22권3호
• /
• pp.620-626
• /
• 2021

본 논문은 지역산업정책에 의해 2002년부터 지속적으로 지원·육성되어온 충남 디스플레이 산업을 대상으로 산업의 집적과 성장성 및 산업효율성 분석을 통해 현재의 산업구조적 특성을 점검하고 미래의 산업적 비전을 제시하고자 하였다. 이를 위해 사업체규모계수(BQ)와 특화도(LQ)를 통해 산업규모와 산업집적현황을 분석하고, 산업성장률(IG)과 산업구조변화율(CIS)을 통해 산업의 성장성과 산업구조변화속도를 분석하였다. 또한 산업의 효율성을 판단하기 위해 노동의 상대적 효율성 지수(RLQ), 부가가치율, 고용계수 및 변이할당분석을 실시하였다. 분석결과, 충남 디스플레이산업은 2017년 현재 산업규모가 전국대비 대규모 형태이고, 매우 높은 집적을 통해 충남의 특화산업으로서 견고한 위상을 보여 주고 있다. 그리고 노동의 상대적 효율성지수에서도 전국대비 상대적인 비교우위를 가지고 있고, 부가가치율도 전국 대비 높게 나타났으며, 고용계수 역시 높게 나타나고 있어서 효율적인 산업활동이 높게 평가된다. 그러나 2013년에서 2017년간의 성장률이 떨어지고 전국보다 산업구조 변화 속도가 낮게 나타나는 등 산업구조적으로 지역경쟁력 측면이 악화되고 있어 구조적이고 혁신적 변화모색이 요구되는 시점이라 판단된다. 따라서 타산업과의 벨류체인을 형성하여 동반 발전을 할 수 있는 분야로 타산업의 고부가가치화와 시장경쟁력 제고에 기여할 수 있도록 연관 산업과 연계된 융복합디스플레이산업으로의 전략이 필요해 보인다. 또한 최근의 지역산업정책인 '지역혁신성장계획'을 통해 지역 특성과 발전방향 등을 고려한 지역산업 육성을 도모하고, 소재·부품·장비 특화단지 육성을 통해 관련 소부장산업의 동반 성장을 추진하는 역할이 필요해 보인다.

• 경제분석
• /
• 제26권4호
• /
• pp.1-38
• /
• 2020

본 논문에서는 산업구조조정과 관련하여 나타나는 산업구조의 변화가 한국경제의 고용 및 성장에 미치는 영향을 탐구하였다. Lilien (1982)의 부문 이동가설에 의하면 산업구조의 변화는 노동시장에서 마찰적 실업을 발생하고 실업을 증가시키는 주요 요인이다. 그런데 마찰적 실업은 동시에 경기상황에 의해 영향을 받을 수 있다. 본 연구에서는 산업구조조정이 고용에 미치는 효과를 경기변동과의 의존성을 고려하여 살펴보았다. 그리고 산업구조 조정이 GDP 증가에 긍정적이라고 보는 Kuznets 가설과 이에 대립되는 Baumol 효과를 분석함으로써 산업구조조정이 경제 성장에 미치는 영향에 대해서도 살펴보았다. 우리나라의 경제활동조사, 사업체노동력조사 그리고 거시경제자료를 사용하여 실시한 분석결과는 다음과 같다. 첫째, 산업구조의 변화가 실업을 증가시키는 단기적 효과가 있으며 경기 수축 국면에서 구조조정의 효과가 더욱 크게 나타나서 우리나라의 경우에는 Lilien의 부문 이동 가설이 실증적으로 유효한 것으로 판단되었다. 둘째, 산업구조조정은 구직과 구인(또는 실업과 빈 일자리)의 관계를 나타내는 베버리지 곡선을 이동시킴으로써 일자리 매칭의 효율성을 감소시키는 결과를 보였다. 특히, 경기변동에 따라 수축 국면에서 매칭 비효율성이 더욱 크게 나타났다. 셋째, 산업구조의 변화가 GDP 성장에 미치는 중장기적 효과가 유의하게 나타났다. 산업구조조정과 함께 생산성이 높은 부문으로 자원의 재배치가 이루어지면서 성장을 제고시킴으로써 Kuznets 가설에 부합하는 결과를 얻었다.

• 산업공학
• /
• 제16권1호
• /
• pp.103-110
• /
• 2003

Growth curves are widely used in forecasting the market demand. When there are only a few data points available, the estimated model parameters have a low confidence. In this case, if some expert opinions are available, it would be better for predicting future demand to adjust the model parameters using these information. This paper proposes the methodology for re-estimation of model parameters in growth curves when adjusting market potential and/or time of maximum sales. We also provide the detailed procedures for five growth curves including Bass, Logistic, Gompertz, Weibull and Cumulative Lognormal models. Applications to real data are also included.

• 한국진공학회지
• /
• 제4권S2호
• /
• pp.84-89
• /
• 1995

The growth and the film characteristics of heteroepitaxial $Si_{1-x}Ge_x$ films growth by the Rapid Thermal Chemical Vapor Deposition(RTCVD)method are described. For the growth of $Si_{1-x}Ge_x$ heteroepitaxial layers, $SiH_4/GeH_4/H_2$gas mixtures are used. The growth conditions are varied to investigate their effects on the Si/Ge composition ratios, the interface abruptness and crystalline properties. The Si/Ge composition ratios are analyzed with the RBS and the SIMS techniques, and the interface abruptness are deduced from these data. The crystalline properties are analyzed from TEM pictures. The experimental data shows that the crystalline perfection is excellent at the growth temperature of as low as $650^{\circ}C$, and the composition ratios change linearly with $SiH_4/GeT_$$ gas mixing ratios in our experimental ranges. Boron doping experiments are also performed using 200 ppm $B_2H_6$ source gas. The doping profiles are measured with SIMS technique. The SIMS data shows that the doping abruptness can be controlled within about 200$\AA$/decade.