• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.19 no.6
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• pp.739-745
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• 2010

The roller gear cam can control the rotational follower periodically by attaching several roller on the circumstance of follower shaft and it is widely used in non-backlash and precise actuating mechanism such as index table or ATC of machine tools. For machining the roller gear cam, 5 axis CNC machine tool is used and the geometric principle of CAM mechanism must be adopted to generate the NC-code and to develop the special CAD/CAM software because there is not commercial CAM system to machine the roller gear cam. The maker of the specially developed software in domestic user is generally from Japan or Taiwan. However these softwares do not reflect the post processing technique for finish machining in the module. Also, there is some limitation for further new application of itself and it needs higher costs for further application. In this study, the CAD/CAM software to overcome these problem was developed. And its reliability was verified by applying it in 5-axis CNC machining. Finally, the experimental result conducted in the 5-axis machining show good consistency in the movement of follower along the flute and in its Size.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.23 no.7
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• pp.662-668
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• 2013

In this paper, possibility of controlling motion of a floating structure using a tuned liquid damper (TLD) is numerically investigated. A TLD is a tank partially filled with liquid. Sloshing motion of liquid inside a tank is known to suppress movement of the tank subject to external excitations at specific frequency. The effects of sloshing phenomena inside a rectangular floating body on its surge motion are investigated by varying external excitation frequency. First, a grid-refinement study is carried out to ensure validity of grid independent numerical solutions using present numerical techniques. Then, surge motion of the floating body subjected to external wave is simulated for five different excitation frequencies of which the center frequency equals to the natural frequency of internal liquid sloshing. The normalized amplitudes of surge motion of the target floating body are compared according to the excitation frequency, for the cases with and without water inside the floating body. It is shown that the motion of the floating body can be minimized by matching the sloshing natural frequency to the excitation frequency.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.15 no.4
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• pp.263-275
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• 2020

In the vortex of change, commonly referred to as the Fourth Industrial Revolution, Korea has a national task of changing the paradigm of economic growth from a chase-type economic structure to a leading one. The era has come when all resources of the country, as well as the government and businesses, must join in innovation and growth in order to maintain the pace of sustained economic development, and significantly advanced countries are stimulating members' innovation activities with various policies and systems as they enter the 21st century. South Korea is also making efforts to create an open creative space referred to as Makerspace or Fab Lab, to create an innovative voluntary environment for its citizens. This study explored factors that Makerspace, which is proliferating in Korea, should consider to secure development and sustainability as an innovation (start-up) space. Through prior research, openness and expertise were derived from the characteristics of Makerspace, and expert interviews confirmed that the capabilities lacking in Makerspace and the capabilities to be secured in the future are openness and professionalism. Also, specific components of openness and professionalism were presented through prior research, and implications for each subject's Makerspace were presented, such as openness, professionalism, and commercialization.

• Parasites, Hosts and Diseases
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• v.54 no.6
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• pp.751-758
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• 2016

This study aimed at constructing a draft genome of the adult female worm Toxocara canis using next-generation sequencing (NGS) and de novo assembly, as well as to find new genes after annotation using functional genomics tools. Using an NGS machine, we produced DNA read data of T. canis. The de novo assembly of the read data was performed using SOAPdenovo. RNA read data were assembled using Trinity. Structural annotation, homology search, functional annotation, classification of protein domains, and KEGG pathway analysis were carried out. Besides them, recently developed tools such as MAKER, PASA, Evidence Modeler, and Blast2GO were used. The scaffold DNA was obtained, the N50 was 108,950 bp, and the overall length was 341,776,187 bp. The N50 of the transcriptome was 940 bp, and its length was 53,046,952 bp. The GC content of the entire genome was 39.3%. The total number of genes was 20,178, and the total number of protein sequences was 22,358. Of the 22,358 protein sequences, 4,992 were newly observed in T. canis. Following proteins previously unknown were found: E3 ubiquitin-protein ligase cbl-b and antigen T-cell receptor, zeta chain for T-cell and B-cell regulation; endoprotease bli-4 for cuticle metabolism; mucin 12Ea and polymorphic mucin variant C6/1/40r2.1 for mucin production; tropomodulin-family protein and ryanodine receptor calcium release channels for muscle movement. We were able to find new hypothetical polypeptides sequences unique to T. canis, and the findings of this study are capable of serving as a basis for extending our biological understanding of T. canis.

• The Journal of Korean Association of Computer Education
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• v.19 no.4
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• pp.1-9
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• 2016

From the influence of DIY (Do It Yourself) and the Maker Movement diverse areas in media, clothing, performing that requires physical computing. That is why the requests of teaching students about physical computing or using physical computing in education area has been increasing. Physical computing education is learning computational thinking by using programming activities, the usage of physical computing is still increasing. However, physical computing education became known recently with the lack of time to research, not only that the effectiveness in education is lacking as well. This research analysed the attitude and accomplishment from different gender of middle schoolers and high schoolers for one semester to see their ideas in programming and increase of designing algorithms.

• Journal of the Korea Convergence Society
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• v.11 no.5
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• pp.289-297
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• 2020

This study was to explore factors determining school-based student health screening participation. Participants were six health coordinators in West Virginia, the United States. They have responsibilities in the student health screening and conducted a phone interview. The results are as follows. First, opt-in of health screening came from the interest in students' health, peer pressure, and free screening. Second, opt-out of health screening came from the indifference to a school newsletter, anxiety about an information disclosure, and the fear of drawing blood. Third, the advantage of health screening was provided for free. Fourth, the primary decision-maker was parents, but sometimes was children. Fifth, non-family members also influenced on the participation in the health screening. Therefore, a school newsletter, parents and teachers education, and free screening may be required to improve the participation rate.

• Journal of the Korean Society for Library and Information Science
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• v.52 no.1
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• pp.425-446
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• 2018

As makerspaces continue to be introduced in academic libraries in Korea, this study explores potential operating strategies of, and long-term justifications for, makerspaces as digital literacy eduational spaces and services at academic libraries. By examining related literature reviews and case studies of makerspaces, this study analyzes various programs and their respective creation, funding, development, and outcomes, including educational value and library-specific goals such as digital literacy and lifelong learning. This study also considers the perspectives of librarians at academic libraries in Korea who were asked about the purpose, impact, and limitations of makerspaces. Certain common themes appear: for example, it is necessary for makerspaces to resolve challenges related to stable funding, as well as staffing and training of professional librarians assisting with the on-the-ground operation of makerspaces. This study proposes that designing makerspaces for an academic library setting goes deeper than providing a collaborative environment with access to new technologies like 3D printers and laser cutters, and it may be uniquely appropriate to draw connections to libraries' objectives to provide digital literacy education and universities' mission to foster innovation and creativity among students.

• Journal of the Korea Convergence Society
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• v.12 no.3
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• pp.141-149
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• 2021

3D printers, which emerged in the late 20th century, have become a key part of the fourth industrial revolution in the 21st century. Although 3D printers, the key equipment of the maker movement and the starting point of the new cottage industry in the 21st century, still reveal the limitations of mass production with low output speed and limited filament materials, the use of 3D printers by ceramic craftsmen has recently increased exponentially. However, as part of a way to overcome the discord between craftsmanship and the new technology, which has been repeated over and over in the past in craft history, the study focused on the 'plaster mold casting' technique using 3D printers. Therefore, after analyzing casting techniques of Tony Hansen, Webe van Gansbeck, Jade Crompton, and Ryu Hee-do, the potters who actively developed gypsum techniques in the world's ceramic crafts field and applied them to their own designs, I tried to find the point of convergence between 3D printers and ceramic crafts by presenting examples of effective 3D modeling methods and optimal slip casting methods using 3D printers.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.34 no.2
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• pp.33-57
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• 2023

The main purpose of this research was to discover the characteristics of the 'commons for all' related to public libraries as much as possible, design the learning content, and finally to demonstrate whether the contents meet the general education requirement of universities. The public library is a study hall for multi-literacy, a common place for lifelong learning without discrimination, a place for experiencing digital sharing culture, a place for practicing public architectural design for community regeneration, a workshop for the maker movement and finally, a hub for forming local communities. In short, it has all the characteristics appropriate to being a commons. This subject titled "Sharing Culture and Local Libraries" is designed and composed with various literacy understanding, information ethics of information literacy, community consciousness and multicultural understanding, public consciousness, cooperative spirit and computer utilization ability, interdisciplinary knowledge, and integrated perspective. In a situation where the regional and public crises are increasing, this kind of general education subject about public library, is expected to contribute greatly to raising the awareness of the library and further enhancing the local community togetherness spirit by spreading the value of the library widely to students and inducing them to actually experience various library services.

• 대한방사선치료학회:학술대회논문집
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• 2005.06a
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• pp.13-17
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• 2005

Introduction : For stereotactic radiosurgery (SRS) of a tumor in the region whose movement due to respiration is significant, like Lung lower lobe, the gated therapy, which delivers radiation dose to the selected respiratory phases when tumor motion is small, was peformed using the Respiratory gating system and its clinical effectiveness was evaluated. Methode and Materials : For two SRS patients with a tumor in Lung lower lobe, a marker block (infrared reflector) was attached on the abdomen. While patient' respiratory cycle was monitored with Real-time Position Management (RPM, Varian, USA), 4D CT was performed (10 phases per a cycle). Phases in which tumor motion did not change rapidly were decided as treatment phases. The treatment volume was contoured on the CT images for selected treatment phases using maximum intensity projection (MIP) method. In order to verify setup reproducibility and positional variation, 4D CT was repeated. Result : Gross tumor volume (GTV) showed maximum movement in superior-inferior direction. For patient $\#$1, motion of GTV was reduced to 2.6 mm in treatment phases ($30\%\~60\%$), while that was 9.4 mm in full phases ($0\%\~90\%$) and for patient $\#$2, it was reduced to 2.3 mm in treatment phases ($30\%\~70\%$), while it was 11.7 mm in full phases ($0\%\~90\%$). When comparing two sets of CT images, setup errors in all the directions were within 3 mm. Conclusion : Since tumor motion was reduced less than 5 mm, the Respiratory gating system for SRS of Lung lower lobe is useful.