• Journal of Institute of Convergence Technology
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• v.4 no.1
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• pp.29-32
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• 2014

최근 유가상승 및 환경오염으로 인하여 자동차 연비 개선에 대한 관심이 날로 증가하고 있어 자동차 제조사들은 다양한 접근방법을 통해 경량화를 달성하고자 하고 있다. 경량화 방법으로는 경량재료의 적용, 고강도 소재를 이용한 부품소형화, 조립식 파트의 일체형 모듈화 등이 있으며, 본 연구에서는 경량구조재료인 마그네슘 합금을 자동차용 스크롤 압축기에 적용하기 위하여 기존 알루미늄 합금부품과의 열팽창 및 열변형의 비교를 통해 마그네슘 합금 적용한 스크롤 부품의 설계시 고려되어야 할 요소들을 분석 및 제시하고자 한다.

• Proceedings of the Korea Contents Association Conference
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• 2014.06a
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• pp.189-190
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• 2014

• Food Industry And Nutrition
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• v.12 no.2
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• pp.37-43
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• 2007

• The Bulletin of The Korean Astronomical Society
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• v.34 no.1
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• pp.52.1-52.1
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• 2009

• Food Industry And Nutrition
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• v.10 no.3
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• pp.22-29
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• 2005

• Food Science and Industry
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• v.47 no.4
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• pp.45-54
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• 2014

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.24 no.4
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• pp.164-168
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• 2014

The sodium-sulfur batteries which operate at $350^{\circ}C$ have been mainly used in the field of energy storage system. This batteries consist of liquid sodium anode, sulfur cathode and ${\beta}^{{\prime}{\prime}}$-alumina solid electrolyte. The conditioning process for stabilization of the batteries is essential since the cells show considerable fluctuation of discharge voltage at the beginning of discharge/charge cycles. It is found that one of the reasons of the fluctuation is the gradual change of contact area between molten sodium and solid electrolyte.

• Journal of the Korean Society of Industry Convergence
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• v.23 no.5
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• pp.865-874
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• 2020

Offshore drilling units have a very dangerous working conditions due to the harsh working environment of the ocean and the high possibility of fire or explosion. This study would identify the hazards that emerge from the marine environment in the operation and maintenance phase of offshore drilling units and show how these hazards can be reduced through risk assessment/management. Various risk reduction and management measures were first reviewed, and Job Safety Analysis (JSA) was selected as the risk assessment technique of this study. In order to understand the characteristics of offshore drilling operations, accident statistics of onshore and offshore drilling were analyzed and compared with each other, and major risk factors for offshore drilling were derived. The jobs in which offshore drilling accidents occur more frequently than onshore drilling was analyzed as the job of fastening, transporting and moving pipes and various materials. This result is due to the limited space of the ocean and the work environment that is prone to being shaken by wind, waves and ocean currents. Based on these statistical results, the job of picking and making up drill pipes was selected as a high-risk job, and JSA was performed as an example. A detailed safety check procedure is proposed so that workers can fully recognize the danger and perform work in a safe state that has been confirmed.

• Transactions of the KSME C: Technology and Education
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• v.4 no.2
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• pp.111-116
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• 2016

Consumer's value based content and business platform are more important than the existing supplier based market. Convergence civilization paradigm is being accelerated with expanded combination of information & communication technology and others. In this study, it was classified into four groups with respect to the level and viewpoints of innovation in products and services, which were already supplied on the market by industry convergence activity. Barriers that are obstacles to the development of a new converged industry through strategic approaches were identified by surveying the current industrial status. In detail, they were summarized with respect to three aspects, such as, target, infrastructure and main agent of individual sector. Finally, it presents an alternative to overcome the obstacles and develop a new growth engines for the future industrial evolution.

• Journal of Microbiology and Biotechnology
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• v.27 no.1
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• pp.101-111
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• 2017

The task of improving a fungal strain is highly time-consuming due to the requirement of a large number of flasks in order to obtain a library with enough diversity. In addition, fermentations (particularly those for fungal cells) are typically performed in high-volume (100-250 ml) shake-flasks. In this study, for large and rapid screening of itaconic acid (IA) high-yielding mutants of Aspergillus terreus, a miniaturized culture method was developed using 12-well and 24-well microtiter plates (MTPs, working volume = 1-2 ml). These miniaturized MTP fermentations were successful, only when highly filamentous forms were induced in the growth cultures. Under these conditions, loose-pelleted morphologies of optimum sizes (less than 0.5 mm in diameter) were casually induced in the MTP production cultures, which turned out to be the prerequisite for the active IA biosynthesis by the mutated strains in the miniaturized fermentations. Another crucial factor for successful MTP fermentation was to supply an optimal amount of dissolved oxygen into the fermentation broth through increasing the agitation speed (240 rpm) and reducing the working volume (1 ml) of each 24-well microtiter plate. Notably, almost identical fermentation physiologies resulted in the 250 ml shake-flasks, as well as in the 12-well and 24-well MTP cultures conducted under the respective optimum conditions, as expressed in terms of the distribution of IA productivity of each mutant. These results reveal that MTP cultures could be considered as viable alternatives for the labor-intensive shake-flask fermentations even for filamentous fungal cells, leading to the rapid development of IA high-yield mutant strains.