• Journal of the Korean Institute of Gas
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• v.24 no.1
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• pp.33-40
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• 2020

Chiller systems which have better temperature stability than Direction expansion coils are often used as condensing units in HVAC systems for offshore plants. Large capacity compressors and electronic expansion valves in chiller systems are mostly imported, and the size of a chiller system depends on heat exchangers such as evaporators and condensers which are locally produced. Due to limited space in the offshore plants, shipyards are demanding manufacturers to make equipment compact. In this paper, a shell & tube heat exchanger, which is used as an evaporator in the conventional flooded chiller system, is replaced by a newly developed compact plate & shell heat exchanger. The main development process of the plate & shell heat exchanger is introduced, and its performances were experimentally evaluated with a real flooded chiller system, and the results are presented.

• Polymer(Korea)
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• v.37 no.6
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• pp.677-684
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• 2013

Zinc alginate films were prepared by a film maker from sodium alginate solutions of different weight ratios and then they solidified into 3 wt% content $ZnCl_2$ coagulation solution and washed and dried at a $60^{\circ}C$ oven for 20 min. The characteristics were measured by several methods (antimicrobial activity, viscosity, FTIR, TGA, SEM, EDS, contact angle, tensile strength and solubility) and the film properties were investigated. The antimicrobial test showed that the zinc alginate films result in excellent antimicrobial activity in the two strains (Klebsiella pneumonia, Staphylococcus). The surface of zinc alginate film from the solution of 9 wt% sodium alginate showed more uniform shape than any other films and the cross-section were hard and rough when the films were well-solidified by the $ZnCl_2$ solution. The tensile strength of zinc alginate films increased along with the concentration of sodium alginate solution due to the cross-linking, and the initial thermal decomposition temperature increased gradually.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.5
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• pp.2594-2602
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• 2014

As environmental awareness increases, regulations on exhaust gas of automobile, which is a cause of air pollution, have been strengthened. In order to meet emission regulation, automobile companies and engine manufacturers have actively developed the related technologies. Because the emission control has become severe, the systems using electronic motor or solenoid valve for high precise control are needed. For this reason, it is required not only the optimization of composition of components for improving performance and efficiency of the system but also the development of optimal design technology of electronic control system by securing the designing and manufacturing technology of the components. In this paper, it is proposed the position characteristics for electronic EGR valve module through the applied control logic and experiment results.

• The Journal of the Korea Contents Association
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• v.9 no.9
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• pp.163-170
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• 2009

This paper is an analysis of the newly invented RED ONE camera and its various advantages, and also a comparison of the results with already existing digital cameras. As film production systems have been converting to digital systems, Arri Camera, one of the existing film camera companies, has invented and developed the Arri D21.Sony, the leader of the high definition digital camera industry, is also securing its role as the leader of digital filmmaking by introducing the CineAlta F-900 series. With these advances in digital filmmaking, the advent of the RED ONE camera opens doors to new possibilities to digital filmmakers. The development of digital cameras with thoughtful consideration for its users has Influenced the filmmaking environment immensely and has become the reason why it is playing a major role in digital filmmaking.

• International Area Studies Review
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• v.12 no.3
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• pp.89-109
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• 2008

Using hybrid channel affords the benefits of achieving control through the direct channel and achieving flexibility through the indirect channel. However, using a hybrid channel also poses special challenges to a manufacturer, including the problem of managing multiple channel members with disparate goals and priorities. The purpose of this study is to enhance our understanding on the management of hybrid channel. We study marketing channels for fashion apparel to examine governance challenges and solutions of a hybrid channel. We have two objectives to fulfill that purpose. First, we aim to tie two largely separate research streams of salesforce management and marketing channel management together by examining both intrafrim governance and interfirm governance issues under one conceptual framework. Second, we aim to lay a ground work for rigorous further research on this topic by tying two major theoretical approaches of governance together under one conceptual framework. Our predictions were tested with data from the survey of apparel manufacturers and retailers. The analysis results support the predictions moderately.

• Journal of Korean Library and Information Science Society
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• v.50 no.2
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• pp.97-119
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• 2019

Libraries both in South Korea and abroad have been adopting 3D printers and related service. This indicates the need for documented 3D printer use policy to facilitate the service. This study investigates 3D printer use policies of libraries in Korea and best practices of the United States, and suggests contents for 3D printer use policies in Korea. The finding shows that Korean libraries with 3D printers did not have systematic and documented 3D printer use policies. After conducting content analysis of 16 best practices of 3D printer use policies from libraries in the United States, the authors identified five themes (purpose, users, procedures, limitations of use, and liability) and 21 sub-themes. The findings are informative for Korean libraries to develop 3D printer use policies and to understand various considerations in implementing 3D printer services.

• Journal of Engineering Education Research
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• v.21 no.2
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• pp.39-50
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• 2018

In the 4th industrial revolution, the maker movement is spreading around the world with the fusion of advanced technology with product manufacturing. Already in developed countries such as the US and Japan, the emphasis is on maker education that integrates education into traditional makers' movement. Through this, we are fostering young talents who will lead the fourth industrial revolution era. Domestic maker education is mainly performed in the maker space, and is limited to the IT field using Arduino and App-Inventor. Therefore, it has the limitation of fostering IT-oriented makers. Therefore, it is affecting the proliferation of the maker's movement because of the difficulty of participation of the general public. The purpose of this study was to understand the characteristics of maker 's movement and to suggest the direction of Korean maker education. In order to accomplish the purpose of research, we analyzed the case of convergent maker education at D Creation Economic Innovation Center, which combines IT and culture technology. We conducted a case study on maker education(VR production project, electronic publishing, beads craft, leather craft, IoT) which was held from July 8 to August 30, 2017 five times. We conducted interviews with five preliminary makers who participated in all the courses of the education, and five instructors who acted as professional makers with pre- developed questionnaires. The results of the study were derived by applying the Thematic Analysis method after opening the contents of the interview. Based on the results of the study, we could suggest characteristics of Korean makers and future direction of maker education.

• Journal of the Korea Convergence Society
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• v.10 no.1
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• pp.133-139
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• 2019

The Tech Shop, which provides an environment for fast prototyping by using 3D printers and various work tools, is a place where the fusion design education can be realized and creative ideas can be produced in the era of industrial 4.0. The purpose of this study is to propose and establish the possibility of a tech shop for the revitalization of local businesses in the Chungcheong province where many of contents related universities and institutions are located. For this purpose, we reviewed the necessity and the requirements of a tech shop, and analyzed the necessary components of a tech shop for successful operation. If the proposed tech shop is built and efficient operation is applied, it is expected that many of prototypes based on good ideas could be quickly produced and commercialized.

• Journal of The Korean Association of Information Education
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• v.25 no.5
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• pp.673-681
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• 2021

This study is a case study of artificial intelligence education subjects in the graduate school of education. The main educational contents consisted of understanding and practice of machine learning, data analysis, actual artificial intelligence using Entries, artificial intelligence and physical computing. As a result of the survey on the educational effect after the application of the curriculum, it was found that the students preferred the use of the Entry AI block and the use of the Blacksmith board as a physical computing tool as the priority applied to the elementary education field. In addition, the data analysis area is effective in linking math data and graph education. As a physical computing tool, Husky Lens is useful for scalability by using image processing functions for self-driving car maker education. Suggestions for desirable AI education include training courses by level and reinforcement of data collection and analysis education.

• Journal of the Korean Society for information Management
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• v.37 no.4
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• pp.27-60
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• 2020

Sejong City Library information services and programs proposed in this study are proposed by combining cases of local representative libraries and overseas libraries. As a feature of the proposal, first, various information services that can be provided by the Sejong City Library are proposed by area, by user, by data type, by media, by partner institution, etc. Second, by reinforcing user programs for each life cycle, various reading programs by age and interest, such as reading discussion, reading experience, and reading events, are provided. Reinforce user-based programs that reflect the characteristics of Sejong City's population, such as adult, child, and family programs. Third, secure and utilize maker space space. Fourth, the reading program developed by the Sejong City Library is promoted and shared in cooperation with local libraries. Fifth, induce participation of local residents in Sejong City, volunteer activities and talent donation. Sixth, propose library information services using library websites and social media, and develop channels for mutual cooperation with users.