• Journal of Powder Materials
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• v.28 no.6
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• pp.483-490
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• 2021

A new Fe-Cr-Mo-B-C amorphous alloy is designed, which offers high mechanical strength, corrosion resistance as well as high glass-forming ability and its gas-atomized amorphous powder is deposited on an ASTM A213-T91 steel substrate using the high-velocity oxygen fuel (HVOF) process. The hybrid coating layer, consisting of nanocrystalline and amorphous phases, exhibits strong bonding features with the substrate, without revealing significant pore formation. By the coating process, it is possible to obtain a dense structure in which pores are hardly observed not only inside the coating layer but also at the interface between the coating layer and the substrate. The coating layer exhibits good adhesive strength as well as good wear resistance, making it suitable for coating layers for biomass applications.

• Proceedings of the KWS Conference
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• 2009.11a
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• pp.226-234
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• 2009

The purpose of this study was to investigate the melting phenomenon of filler wire in detail and to obtain the precise temperature distribution of filler wire during GTA welding under the ultra-high welding speed condition in order to develop the ultra-high-speed GTA welding process with the pulse-heated hot-wire system by using three kinds of materials. The melting phenomenon of filler wire was observed using a high-speed camera and the temperature distribution of filler wire was measured using a radiation thermometer. From the above result, the adequate welding conditions of each material to make the GTA welding process with the ultra-high welding speed could be obtained. The ultra-high-speed GTA welding process needed the adequate wire current in order to obtain the adequate temperature distribution and the adequate melting position of filler wire. Moreover, the temperature distributions of three kinds of filler wire could be estimated by using the proposed simple estimation method.

• Journal of Industrial Convergence
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• v.20 no.4
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• pp.39-46
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• 2022

This descriptive survey study identified the factors influencing the abiliy of healthcare perceived by high school students. The survey was conducted from May 7, 2020, to Sep. 17, 2020 for 119 high school students in City D. SPSS WIN 22.0 program was used to for t-test and one-way ANOVA with Pearson's correlation coefficients and hierarchical regression analysis. The ability of healthcare perceived by high school students had a static correlation with the sub-domains of family function, that is, family cohesion(r=.65, p<.001) and family adaptability(r=.54, p<.001). For male students(β=.17, p=.012), those who reported a high level of perceived health status showed a high level of ability of healthcare(β=.25, p<.001). Significant influencing factors on high school students' health management ability were identified as gender (β=.17), their own health status perception (β=.23), and family cohesion (β=.45), and the explanatory power of the model was 50%. appear. Further research is hereby suggested for validation of the mediating role and effects of health care education programs to improve the family function perceived by high school students, encourage their practicing of health care management and help them to enter into healthy adulthood.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.12
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• pp.689-698
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• 2019

The purpose of this study was to develop methods to practice and revitalize entrepreneurship education at vocational high schools. To achieve this goal, we analyzed the vocational high school program as well as effective entrepreneurship education programs at vocational high schools. In addition, FGI (Focus Group Interview) was conducted to determine strategies for developing entrepreneurship education at vocational high schools. The results were as follows. First, curriculum formation was found to important for vitalizing entrepreneurship education at vocational high schools. It is necessary to develop vocational high schools to account for the 4th Industrial Revolution as well as develop students' competence in entrepreneurship as the basis for the curriculum. Second, the operational aspect of the entrepreneurship education curriculum must be considered. Entrepreneurship education linked to regular curriculum is needed. Third, the competence of school members is an important factor for the efficient operation of vocational high school entrepreneurship education. Fourth, entrepreneurship education can consist of various educational activities through connection with the school and community. Based on these results, operating vocational high school entrepreneurship education will enable practical and dynamic entrepreneurship education at vocational high schools.

• Journal of Korean Institute of Industrial Engineers
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• v.37 no.4
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• pp.400-407
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• 2011

Modeling and analysis of high-dimensional spectral data provide an opportunity to uncover inherent patterns in various information-rich data. Orthogonal signal correction (OSC) a preprocessing technique has been widely used to remove unwanted variations of spectral data that do not contribute to prediction or classification. In the present study we propose a novel OSC algorithm called adjusted direct OSC to improve visualization and the ability of classification. Experimental results with real mass spectral data from condom lubricants demonstrate the effectiveness of the proposed approach.

• 대한공업교육학회지
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• v.31 no.1
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• pp.146-169
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• 2006

'VEC 2010' is a mid-long term scheme on the development of Vocational Education for Chung-buk which is to be accomplished by 2010. On the basis of this scheme, schools adopt 3-Type curriculum considering their conditions and covert themselves into specialized high school which is associated with local industry cluster. They also establish combined high schools which run various curriculums emphasizing basic vocational abilities so that they can meet the needs of demanders The activation plan of Chung-buk province vocational education is a dualized one which is for both ongoing education for entrance into a school of higher grade and the last education for employment, which is supposed to foster the human resources required by the knowledge-based society in the 21st century. The specific contents of 'VEC 2010' is as follows. First, VEC 2010 presents 2 kinds of mid-long term management system for industrial high schools: general industrial high school, specialized high school(single type, combined type). Second, VEC 2010 arranges and run the 3-Type of curriculum of Chung-buk province industrial high schools: employment-centered type, entering higher school-centered type, inaugurating enterprise-centered type. Third, VEC 2010 divides Chung-buk province industrial high schools into 4 districts and suggests mid-long term reorganization plan of system. Fourth, VEC 2010 suggests the substantial strategies of Chung-buk province vocational education: scholarship improvement in the vocational investigation course of the government-sponsored scholastic aptitude test, education for improving basic vocational abilities, substantial management of joint laboratory, administrative and financial support of development of specialized, licensed textbooks. reenforcement of career education.

• 대한공업교육학회지
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• v.31 no.2
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• pp.83-110
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• 2006

A change in industrial education has been demanded with the emergence of rapidly changing knowledge-based society. Keeping pace with the current trend, the Specialized High Schools should analyze what their students need and suggest what they should do to be qualified for work. Even though the education paradigm is in the process of change from traditional industrial society to knowledge-based society, the Specialized High School still focuses on the out-of-trend traditional curriculum. Now, it's a time to introduce new curriculum which analyzes on-the-spot tasks and enhances students' creativity and capability to solve problems. For this study, new '3-Type school curriculum' models are examined. Furthermore, the on-the-spot based curriculum, which nurtures students' creativity and capability to take care of things should be adopted. This paper showed a direction toward the activation and generalization of the industrial education by specifying to which direction the 3-type curriculum-based the Specialized Vocational High School should move.

• Journal of Microbiology and Biotechnology
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• v.31 no.12
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• pp.1722-1731
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• 2021

The genus Streptomyces is intensively studied due to its excellent ability to produce secondary metabolites with diverse bioactivities. In particular, adequate precursors of secondary metabolites as well as sophisticated post modification systems make some high-yield industrial strains of Streptomyces the promising chassis for the heterologous production of natural products. However, lack of efficient genetic tools for the manipulation of industrial strains, especially the episomal vector independent tools suitable for large DNA fragment deletion, makes it difficult to remold the metabolic pathways and streamline the genomes in these strains. In this respect, we developed an efficient deletion system independent of the episomal vector for large DNA fragment deletion. Based on this system, four large segments of DNA, ranging in length from 10 kb to 200 kb, were knocked out successfully from three industrial Streptomyces strains without any marker left. Notably, compared to the classical deletion system used in Streptomyces, this deletion system takes about 25% less time in our cases. This work provides a very effective tool for further genetic engineering of the industrial Streptomyces.

• Journal of Environmental Science International
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• v.6 no.5
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• pp.451-459
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• 1997

This paper alms to describe the indoor-outdoor air quality in school environment through the analyses of heavy metal concentration by inductively Coupled Plasma(ICPI, which were observed at some school environment, such as traffic area, industrial area seme-industrial area, and residence area. The results are as follows : (1) Regardless Indoor and outdoor, the area with the highest concentration of heavy metal is industrial area followed by traffic area, residence area and semi-industrial area in descending order of magnitude. And the heavy metal concentration of indoor is higher than that of outdoor. (2) The main heavy metal components with more high level concentration of Indoor than those of outdoor are Zn, Al, Ca and these heavy metal concentrations are higher in class than In corridor and outdoor.

• Journal of the Korea Safety Management & Science
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• v.12 no.2
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• pp.25-33
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• 2010

Nowadays worldwide leading companies try to establish more efficient and comprehensive management system for getting high quality, reliability and safety. In this paper, we investigate standards for quality management, dependability management and risk management. We also suggest an integrated and comprehensive system of quality(ISO/TS16949), dependability (IEC60300)and risk(JIS Q2001). The evaluation method on the performance of dependability management systems are developed and applied for the semiconductor equipment company.