• Journal of Technology Innovation
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• v.19 no.1
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• pp.29-53
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• 2011

This paper analyzes the effects of government-sponsored R&D on firm's employment and management performance, using the panel data of manufacturing firms in the area of Busan, Ulsan and Gyungnam. The paper applies PSM to estimate the treatment effects(ATT) without sample selection bias. The findings show that government-sponsored R&D in the area has positive effects on the participating firms' employment and R&D for several years after completing R&D projects.

• Journal of the Korea Convergence Society
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• v.10 no.2
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• pp.49-56
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• 2019

This study was to examine whether an elderly can health-related quality of life(EQ-5D) by the mediating effect of dental health determinants on the association between health practice behavior and EQ-5D. The analysis was conducted on 1,311 of above the age of 65 in elderly by using raw data from the 2015 National Health and Nutrition Survey. The data were analyzed using SPSS for windows version 24.0 and SPSS PROCESS-macro. The health practice behavior and EQ-5D by living arrangement were the highest in the one-generation family(4.62, 0.90) and the lowest the elderly living alone(4.40, 0.86). Also, analysis using the PROCESS macro indicated that the FS-T index has a mediating effect between health practice behavior and EQ-5D(${\beta}=.0011$, BCCI [.003~.0024]). These findings suggest that FS-T index is closely related to EQ-5D and this will be used as basic data for development of health promotion programs for elderly.

• Journal of Korea Technology Innovation Society
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• v.10 no.4
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• pp.706-726
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• 2007

This study attempts to empirically investigate the effects of government R&D subsidies on private firm's R&D investment in Korean industry. The R&D subsidy effect is defined as the average percentage change in firm's R&D expenditures between what was actually observed among firms that received a subsidy and what these firms would have spent had the subsidy not been received. To measure the effect we use Difference-in-Differences (DID) model which sign as to whether the relationship between government subsidies and private R&D investments is on stimulating or displacing private R&D expenditures. The differences between this study and previous studies are that we tries to measure the effect of Government R&D across various sited firm groups such as large, small & medium, and venture firms and we add one lag of the subsidy indicator in order to capture the effect of the subsidies on private R&D during 2 consecutive period. Empirically, a firm with government R&D subsidy increases its own R&D investment by 13.9%. Also on average, 1% of government R&D subsidy leads to 0.031% of private R&D increase. The main results of this study are as follows : First, Government R&D subsidies stimulate private firm's R&D expenditures. Second, Government R&D subsidies greatly increase (statistically significant) company financed R&D expenditures only for large firms but had no effect on the R&D expenditures of small & medium sized firms and venture firms.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.32 no.3 s.58
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• pp.153-160
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• 2006

We synthesized 2',4'-dimethoxyflavone and investigated the effects on melanogenesis. To determine the effects as a whitening agent, various in uitro tests were performed such as free radical scavenging activity, melanin assay, tyrosinase activity and expression of tyrosinase, TRP-1 and TRP-2 (western blot and RT-PCR) in Bl6 melanoma cells. 2',4'-Dimethoxyflavone showed neither free radical scavenging activities against 1,1- diphenyl -2-picrylhydrazvl (DPPH) radical and inhibition of mushroom tyrosinase activity, 2',4'-dimethoxyflavone significantly inhibited melanin production in B16 melanoma cells. 2',4'-Dimethoxyflavone treatment (48h) suppressed the biosynthesis of melanin up to 27% at $5{\mu}g/mL$ and reduced tyrosinase activity up to 20% at $5{\mu}g/mL$ in B16 melanoma cells. 2',4'-Dimethoxyflavone was also able to significantly inhibit tyrosinase and TRP-1 expression in protein and mRNA level. These results suggest that 2',4'-dimethoxyflavone inhibits melanin biosynthesis at the level of enzyme activity and protein mRNA expression B16 melanoma cells. Therefore, 2',4'-dimethoxyflavone may be useful as a new whitening agent in cosmetics.

• Journal of Korean Ophthalmic Optics Society
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• v.8 no.2
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• pp.19-24
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• 2003

This study was performed to survey the correspondence between the optical centers and pupillary centers in 224 eyes. The results were as follows: 1. The eye types were 136 eyes(60.7%) for myopic, 85 eyes(37.9%) for astigmatism, 3 eyes(1.4%) for hyperopic. 2. The horzontal prismatic effects of the 35 eyes (in ${\pm}0.25$ < $$D{\leq_-}{\pm}1.00$$) underpassed the aberration of tolerence of opthalmic dispensing in 34 eyes(97.1%). 3. The horzontal prismatic effects of the 167 eyes (in ${\pm}1.00$ < $$D{\leq_-}{\pm}6.00$$) underpassed the aberration of tolerence of opthalmic dispensing in 136 eyes(81.4%). 4. The horzontal prismatic effects of the 22 eyes (in ${\pm}6.00$ < $$D{\leq_-}{\pm}12.00$$) underpassed the aberration of tolerence of opthalmic dispensing in 12 eyes(54.5%).

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.38 no.1
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• pp.12-21
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• 2010

This paper focuses on the hover performance experiment of a small-scale single rotor in partial ground conditions. In this study, small-scale rotor blade rotating device and floor panel are used to include partial ground effect. Thrust and torque were measured with varying collective pitch angles at fixed rotor rotating speed. The overlap distance between rotor and ground is d, the rotor diameter is D. It was shown that the ground effects have little effect on the rotor performance until d/D is 0.25. Four blade rotor has more increased thrust and more reduced power than those of two blade rotor because of stronger ground effect. In addition, it was also found that the thrust increases as a collective pitch angle become smaller. Based on these experiment results, we deduced new empirical equation considered blade number and partial ground effect.

• The Korean Journal of Pesticide Science
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• v.13 no.4
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• pp.275-282
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• 2009

The effect of two plant growth-promoting rhizobacteria (PGPR) on plant growth and systemic protection against soft rot disease and stem rot disease of canola (Brassica napus), caused by Erwinia carotovora and Sclerotinia sclerotiorum was investigated in a laboratory and a greenhouse. Selected PGPR strains C4 and D8 were treated to canola seeds by soaking. Strains C4 and D8 significantly not only increased plant height and root length about 74% and 40.3% and also reduced disease severity of soft rot disease by 80% by C4 and D8 respectively, compared to the control. Especially strain C4 showed antifungal activity against 6 fungal pathogens, S. sclerotiorum, Rhizoctonia solani, Botrytis cinerea, Fusarium oxysporum, Phytophthora capsici and Colletotrichum acutatum. In greenhouse experiment, the seed treatment of both of them increased plant height, leaf width and leaf length of canola plant to 19.5% and 24.9%, 11.3% and 15.3%, and 14.1% and 20.7% by C4 and D8, respectively, and reduced disease severity of S. sclerotiorium. These results indicate that these two PGPR strains can decrease disease severity and increased plant growth under greenhouse condition. Therefore, these two bacteria have a potential in controlling Sclerotinia stem rot of canola. These strains have to investigate under field condition to determine their role of antibiosis, induced systemic resistance and plant growth promotion on canola.

• Korean Journal of Weed Science
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• v.4 no.2
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• pp.211-218
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• 1984

In order to establish the chemical weed control systems in orchard, field experiments were conducted to evaluate the effects of spray methods and mixing of herbicides. The mixtured dosage of glyphosate 100cc/10a and 2,4-D 75㏄/10a showed higher control effects than mono-treatment of glyphosate and paraquat on Artemisia vulgaris var. indica and Polygonum hydropiper L. And oxyfluorfen was more effective in reducing the cover rate and dry weight of weeds than simazine and alachlor on 75th day after treatment. In the mixing experiment of land and foliar appling herbicides. The effect of glyphosate on May 17 followed by oxyfluorfen on June 12 showed the best control effect.

• Journal of Technology Innovation
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• v.26 no.4
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• pp.122-145
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• 2018

This paper investigates the relationship between R&D professionals' career plateau and organizational commitment in which career plateau's sub-dimensions consist of structural and job-content plateau. Further, it aims to examine the moderating effect of age and creative behavior of R&D professionals on the relationship between career plateau and organizational commitment. Empirical data were collected from 418 R&D professionals who work for Government sponsored research institutions. The results showed that the relationship between structural plateau and organizational commitment is differently related depending on age level. That is, the negative relationship between structural plateau and organizational commitment is stronger for junior R&D professionals. Furthermore, the relationship between job-content plateau and organizational commitment is negatively related, and differs in the strength depending on the creative behavior level of R&D professionals. For one with stronger characteristics of creative behavior, job-content plateau is more negatively related to organizational commitment. Based on the results, some implications are suggested on the career plateau issues of R&D professionals who work for government sponsored research institutions. Finally, it is discussed on the limitations of this study and further research directions.

• Journal of the Korea Convergence Society
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• v.8 no.1
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• pp.89-96
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• 2017

This study is to analyze seven fluoride varnishes remineralizing effects on early carious lesions in the clinical field. While CS, MI, CW, VV, EP, FP and FN were used for permanent teeth, CS, MI, CW and FP were used for primary teeth. The specimens were demineralized for 4 days after forming a $3{\times}3mm^2$ window with nail varnish, applied with varnishes separately, then were stirred in artificial saliva for 1 week. QLF-D analysis of carious lesion size showed that permanent teeth's ${\Delta}F$ value decreased after applying CS(4,64), MI(4.86), CW(4.50), and EP(5.50), while for primary teeth, FP(3.00) and MI(3.00) displayed a remineralizing effect. Thus, MI can be used effectively for preventing caries for both adults and children in the clinical field.