재조합 대장균으로부터 생산된 Bacillus 속 균주 유래 Mannanases의 내산성과 열안정성 비교

전호진,윤기홍,Jeon, Ho Jin,Yoon, Ki-Hong 한국미생물학회 2014 미생물학회지 Vol.50 No.4

Two genes encoding the mannanase of Bacillus sp. YB-1401 and B. amyloliquefaciens YB-1402, which had been isolated at acidic pH as mannanase producers, were each cloned into Escherichia coli, and sequenced. Both mannanase genes consisted of 1,080 nucleotides, encoding polypeptides of 360 amino acid residues. The deduced amino acid sequences of the two mannanase genes differed by four amino acid residues different, and were highly homologous to those of mannanases belonging to the glycosyl hydrolase family 26. Comparison of two mannanases produced from recombinant E. coli indicated that His-tagged mannanase of YB-1402 (HtMAN1402) was more stable than that of YB-1401 at acidic pH and high temperature. In particular, HtMAN1402 retained more than 50% of its activity at pH 3.0 after 4 h of pre-incubation, suggesting the enzyme is a valuable candidate for use as a feed additive. In addition, thermostability of the two mannanases was found to be enhanced by $Ca^{2+}$ ions. 산성 배지에서 성장하며 mannanase를 생산하는 균으로 분리된 Bacillus sp. YB-1401과 B. amyloliquefaciens YB-1402로부터 mannanase 유전자를 각각 클로닝하고 그 염기서열을 분석한 결과 2개 유전자는 동일하게 360 아미노산으로 구성된 단백질을 코드하며 1,080 뉴클레오티드로 구성되어 있다. 아미노산 잔기 배열의 유사성을 분석한 결과 이들 mannanases는 서로 4개의 잔기가 다르며 glycosyl hydrolase family 26에 속하는 mannanase와 상동성이 높았다. 재조합 대장균이 생산하는 YB-1402 유래의 His-tagged mannanase (HtMAN1402)가 YB-1401 유래의 His-tagged mannanase (HtMAN1401)에 비해 열안정성과 산성 pH에서 안정성이 높았다. 특히 HtMAN1402는 pH 3.0에서 4시간 방치 후에도 약 50% 이상의 잔존활성을 보여 사료첨가용 효소로 사용되기에 적합한 특성을 보였다. 또한 이들 효소는 $Ca^{2+}$ 이온에 의해 열안정성이 증가하는 것으로 확인되었다.

한국 물류기업의 경영성과 요인분석

전호진,김영민,Ho-jin Jeon,Young-min Kim** 한국국제상학회 2015 國際商學 Vol.30 No.2

본 연구에서는 어떤 요인이 국내 물류기업의 경영성과에 영향을 미치는지 실증적으로 분 석하고, 물류기업의 경영성과 개선을 위한 시사점을 제시하고자 하였다. 다중회귀분석모형을 이용하여 물류기업의 인건비, 물류비, 환율, 국제유가, 수출입 금액, 판매관리비와 같은 요인이 기업가치(Tobin´Q), 수익성, 안정성, 성장성 등과 같은 경영성과 에 미치는 영향을 분석하였다. 실증분석 결과, 인건비와 경영성과 간에는 인건비 증가율과 경영성과 간에 유의한 음(-) 의 관계를 나타냈으며, 물류비와 경영성과 간에는 유의한 양(+)의 관계를 보여 물류비 상승 은 수익성에 긍정적인 영향을 미친 것으로 나타났다. 또한 환율과 관련하여 유의한 결과를 도출할 수 없었으며, 국제유가와 경영성과 간에는 음(-)의 유의한 결과를 도출할 수 있었다. 이러한 결과는 물류기업의 원가에서 유류비의 비중이 높기 때문인 것으로 유추해 볼 수 있 다. 수출입 금액과 경영성과 간에는 일관적인 결과가 도출되지 않았으며, 판매관리비와 경 영성과 간에는 유의한 음(-)의 결과를 보였다. Purpose : This study analyzes the determinant factors on business performance of the logistics firm in Korea, and suggests its implications for improving the business performance. Research design, data, methodology : This study applied multiple regression analysis to analyze the factors(labor cost, logistics cost, exchange rate, international oil price, export and import trade volume, selling and administrative expense) influenced business performance of firm value, profitability, stability, growth in logistics firms. Results : Labor costs has significant negative results with business performance. We found unusual results that had positive relation between logistics costs and business performance. In this results, higher logistics costs always lead to profitable betterment. And it couldn’t drew significant results when it came to this exchange rate. But significant negative results were between international oil price and performance. These results suggested that cost structure was heavy on oil prices in logistics firms. It couldn’t drew significant conclusion from the import and export trade volume. But it had negative relation from selling and administrative expense. Conclusions : To improve business performance in domestic logistics firms, maximizing manpower utilization and saving logistics cost must be taken precedence.

열간가압성형기술을 이용한 Ai-SiC 금속기 복합재료 개발

전호진,김태원,Jeon, Ho-Jin,Kim, Tae-Won 한국복합재료학회 2007 Composites research Vol.20 No.4

Powder metallurgy has been employed for the development of SiC particle reinforced aluminum metal matrix composites by means of hot isotropic pressing and vacuum hot pressing. A material model based on micro-mechanical approach then has been presented for the processes. Densification occurs by the inelastic flow of matrix materials during the consolidation, and consequently it depends on many process conditions such as applied pressure, temperature and volume fraction of reinforcement. The model is implemented into finite element software so that the process simulation can be performed enabling the predicted relative density to be compared with experimental data. In order to determine the performance of finished products, further tensile test has been conducted using the developed specimens. The effect of internal void of the materials on mechanical properties therefore can be investigated.

글로벌 물류기업에 대한 애널리스트(Analysts)투자의견 변경이 주식시장에 미치는 영향에 관한 연구

전호진 ( Ho Jin Jeon ),엄승섭 ( Seung Sub Eum ) 한국유통정보학회 2008 유통정보학회지 Vol.11 No.4

롤투롤 슬롯-다이 코팅 시스템에서 잉크 퍼짐성과 코팅층 표면 조도 간 상관관계 분석

전호진(H. Jeon),이해미(H. Lee),이창우(C. Lee) Korean Society for Precision Engineering 2022 한국정밀공학회 학술발표대회 논문집 Vol.2022 No.10

연구개발 투자에 따른 기술무역 의존도와 기업가치 간의 실증분석

전호진(Ho-Jin Jeon) 한국무역연구원 2011 무역연구 Vol.7 No.1

This paper is the empirical study how effecting R&D investments on firm´s value and degree of technology dependence upon foreign trade in the KOREA, JAPAN electric and electronic equipments industry. Found the following interesting results. First, the empirical results show that an increase in R&D intensity has significant positive relations with KOREA firm´s value. but, no significant positive relations with JAPAN firm´s value. Second, the scale of R&D investments are negatively related to firm´s value. in the result means that investors considered expenses in the short term. Third, met with result that as time goes by, R&D investments influence falls off. Lastly, from the t-test as to whether there is a difference between hign R&D intensity firm´s and firm´s in terms of impacts on firm values. hign R&D intensity firm´s tobin´Q higher than other firm´s tobin´Q.

물류기업의 안전 활동이 재무성과에 미치는 영향

전호진(Ho-Jin Jeon),김영민(Young-Min Kim),홍의(Eui Hong) 한국국제상학회 2021 國際商學 Vol.36 No.1

본 연구에서는 물류기업의 물류안전 활동, 투자가 재무성과에 미치는 영향 요인을 살펴보았다. 물류안전 활동과 물류성과, 기업이미지 간에는 대체로 양(+)의 결과를 도출하였다. 물류안전 활동과 재무성과 간의 관계에 있어서는 물류안전 실천과 수익성 간에는 음(-)의 관계를 보였으며 안전성, 효율성에도 부정적인 영향을 나타냈다. 안전관리, 예방관리는 수익성, 안전성, 효율성에 대체로 긍정적인 영향을 미치는 것으로 나타났다. 물류안전 투자와 재무성과 간에는 물류 교육과 관련하여서는 수익성, 안전성, 효율성에 긍정적인 영향을 나타냈다. 반면에 운송구 비율, 비용의 지출은 수익성에 부정적인 영향을 보였으며 효율성, 안전성에도 부정적인 영향을 미치는 것으로 나타났다. 근로자 복지와 관련한 임금 수준과 재무성과 간에는 매출과 순이익 증가율은 다소 낮았으나 ROE에는 양(+)의 관계를 보였으며 안전성, 효율성에도 긍정적인 영향을 미쳤다. 복지 지출과 관련하여서는 수익성과는 양(+), 안전성은 음(-)의 결과를 나타냈으며 효율성은 다소 떨어지는 결과를 보였다. Purpose : This study aims to is to analyze the impact of safety activities and investment of logistics companies on their financial performance. Research design, data, methodology : In this study, multiple regression analysis was conducted to examine how safety activities and investment impact financial performance. Safety activities variables from logistics company workers were surveyed with a Likert scale. Profitability, stability, and growth variables were measured by utilizing financial performance. Results : The logistics safety activities, logistics performance, and corporate image generally indicated positive relations. Also there was a negative relationship between safety practice and profitability, and it also negatively impacted safety and efficiency. Safety management and preventive management have generally been shown to have a positive impact on profitability, stability, and efficiency. Also it had a positive impact on profitability, stability, and efficiency in relation to logistics education. On the other hand, spending on delivery equipment ratio and expenses had a negative impact on profitability, efficiency, and stability. Conclusions : Although sales and net income growth rates were low between wage levels and financial performance related to worker welfare, they showed positive relationship to ROE and also positive impacted on stability and efficiency. With respect to a company s welfare spending, the results were positive for profitability and negative for stability, and somewhat less efficient.

유연 기능성 필름의 열변형에 따른 롤투롤 시스템 건조 공정 장력 제어 성능 간 상관관계 분석

전호진(H. Jeon),노재현(J. Noh),김민재(M. Kim),이창우(C. Lee) Korean Society for Precision Engineering 2023 한국정밀공학회 학술발표대회 논문집 Vol.2023 No.5

합성곱 신경망을 이용한 복잡한 형상을 가진 공의 인식

전호진(Ho-Jin Jeon),조백규(Baek-Kyu Cho) 제어로봇시스템학회 2017 제어·로봇·시스템학회 논문지 Vol.23 No.5

Image processing is widely used not only in manufacturing industries, but also in advanced contexts such as RoboCup, an international robotics competition. Recently, in the image processing field, convolutional neural networks, which is a deep learning approach, became the mainstream of object recognition algorithms. In this paper, a convolutional neural network is designed and used to learn the features of the ball in the RoboCup soccer game. The convolutional neural network was named JeoNet. JeoNet was modified to learn fewer features than VGGNet and ResNet, but shows the same performance. In order to obtain the detected ball’s position, the Single Shot Multibox Detector was applied. To verify JeoNet, an experimental environment was constructed in which a soccer robot finds a ball in the sight. The benefits of JeoNet were shown by comparing the tracking time of the ball between JeoNet and conventional machine vision based ball finding algorithms.

국내 게임산업 외국인 투자 결정요인 분석

전호진(Ho Jin Jeon) 한국컴퓨터게임학회 2016 한국컴퓨터게임학회논문지 Vol.29 No.2

This paper empirically studies foreign investor investment decision-making factors of game industry. First of all, I couldn´t find many significant results relation to business performance. In terms of safety, The negative(-) relationship could be found between current ration, debt ration and foreign ownership. The growth(growth rate of sales, net profit growth rate) showed positive(+) relationship with foreign ownership. In terms of profitability, Between ROE, ROA and foreign ownership also showed positive(+) relationship . Finally, the R&D investments and weight of export are positive(+) related to foreign ownership. In this results, I can conjecture about foreign investor focus on Safety , Growth , Profitability. especially, can be inferred that R&D and weight of export factors attract foreign investors.