• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.377-380
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• 2005

In this paper, accelerated stress test(AST) for Magnetic Switch (MS) are applied to assure specified reliability of the products. Magnetic contactor that functions with over-current relay is called MS. Magnetic contactor closes and opens the motor load with ON/OFF switch of electronic contactor. It is also used for protecting and controlling the load. Magnetic contactor detects the over-current flow in the load with a over-current relay and disconnects the load by opening its control power. In this study, AST for product assembly are developed in order to improve the weak point so that increase the product reliability. Also we will show the basic information for the accelerated life test(ALT). The proposed AST results and procedures may be extended and applied to testing similar kinds of products to reduce test times and costs of the tests remarkably. Finally the results of this study will contribute to improving reliability of products and strengthening competitiveness of our products in the world markets.

• Korean Journal of Materials Research
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• v.29 no.12
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• pp.804-811
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• 2019

As the importance of three-dimensiona (3D) nano patterns and structures has recently emerged, interest in the study of 3D structures of block copolymers has increased. However, most existing studies on block copolymer 3D patterns on substrates are limited to simple 3D structures such as a multi-layered forms. In this study, we propose an experimental method for realizing free-standing 3D block copolymer patterns on substrates using an e-beam lithographic template and film transfer method. The block copolymer 3D structure formed in wide hole templates are similar to simple multi-layered structures; however, as the width of the hole template become narrower, more complex block copolymer 3D structures are formed in which the upper and lower layer structures are interconnected. Furthermore, we introduce a method to fabricate novel block copolymer structures in which the 2D planar structures are connected to 3D complex structures. Proposed 3D block copolymer fabrication method provides a framework for generation of unconventional 3D structures of block copolymer, which can be useful for next generation 3D devices.

• Nuclear Engineering and Technology
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• v.52 no.3
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• pp.589-596
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• 2020

Many components in the assembly section of Sodium-cooled Fast Reactor are made of good corrosionresistant 316 LN Stainless Steel material. To avoid self-welding of the components with the coolant sodium at elevated temperature, hardfacing is inevitable. Ni-based colmonoy-5 is used for hardfacing due to its lower dose rate by Plasma Transferred Arc process due to its low dilution. Since Ni-Cr-B-Si alloy becomes very fluidic while depositing, the major height of the weld overlay rests inside the groove. Hardfacing is also done over the plain surface where grooving is not possible. Therefore, grooved and ungrooved hardfaced specimens were prepared at different travel speeds. Fe content at every 100 ㎛ of the weld overlay was studied by Energy Dispersive Spectroscopy and also the micro hardness was determined at those locations. A correlation between iron dilution from the base metal and the micro hardness was established. Therefore, if the Fe content of the weld overlay is known, the hardness at that location can be obtained using the correlation and vice-versa. A new correlation between micro hardness and dilution coefficient is obtained at different locations. A comparative study between those specimens is carried out to recommend the optimum travel speed for lower dilution.

• Journal of Families and Better Life
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• v.27 no.5
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• pp.43-57
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• 2009

This study analyzes the tendency for studies of children's manners in Korea. This research provides basic information for future research on the study of children's manners. I reviewed previous research during Mar.10~Apr. 30., 2009, and published articles that used terms such as 'ye-jul', 'yua ye-jul', 'jun-tong ye-jul', and 'yua-dare kyo yuk' as key-words provided by the National Assembly Library and Academic Information Center, and the terms were used for contents analysis. In the past, parents usually taught manners to their children at home, but now, most children learn etiquette at kindergarten and day care centers. A greater portion of the studies dealing with children's manners has been published since 2001. The experimental method was used for most of this research. Based on the results, I have made suggestion regarding the direction of future studies of children's manners. Research should investigate the value of children's manners and philosophy in future research. Based on the personal characteristics of each child and their understanding of the ecological environment, studies of children's manners require an interdisciplinary research approach or ecological research approach. These studies should continue to research in cooperation with kindergartens and day care centers. In addition, further research should focus on an effective teaching method or instructional media research of children's manners.

• Proceedings of the KIEE Conference
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• 2001.05a
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• pp.278-282
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• 2001

The purpose of this study is to introduce a new spacer damper for the bundle transmission lines network. It has the special design, the main characteristics and advantage of this new kind of spacer damper. An Existing spacer damper with bolted clamps, although widely used, is a method of connection with certain disadvantage both as regards assembly on the conductor and in the course of time. Even if tightening torque is correctly applied by using bolt with share head or torque wrench during working time, the aeolian vibration could involve untightening during life time, so the cable can move into the Jaws and wire's breakage appear. To salve this problems, France, Japan and other countries had developed a spacer damper with an automatic system through many years. This new spacer damper is an original automatic clamping device (beltless) which does not require special tool for its installation. This device prevents clamp unlocking problems, ensures a simple installation and ensures a reliable-tightening during life time. Therefore, it is necessary to localize this boltless spacer damper with automate clamping device.

• Hwankyungkyoyuk
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• v.22 no.4
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• pp.53-65
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• 2009

Saemangeum is the largest reclaimed land in Korea. Saemangeum is the large scale project responding to the economic demand of globalization, and a government initiated new development business with a vision of global Free Economic Zone(FEZ). Jeollabuk-province conducted a international competition to establish a global-scale, creative development plan and grow the Saemangeum as an international destination of economy, and a world-wide brand. SGFEZ has much to offer in terms of tourists attractions and breathtaking scenery. And tourism is one of the important industry in SGFEZ. Many tourist facilities will be construct in SGFEZ. Environment is the important issue in many field of study. Recent days, green growth come into the spotlight in Korea. But even as SGFEZ prepares for its future global tourists attraction, so much of the tourism policy directions remains unconsidered. The objective of this study was to suggest tourism policy direction, especially concentrated on ecology tourism policy direction of Saemangeum Gunsan Free Economic Zone(SGFEZ).

• The Korean Journal of Health Service Management
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• v.4 no.2
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• pp.107-117
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• 2010

In this paper, the researcher looked into major issues in the "Act (Draft) on Remedy for Damage from Medical Accident and Medical Dispute Mediation, etc." which was proposed by the Health & Welfare Committee, the National Assembly of the Republic of Korea, and which was pending with the Legislation & Judiciary Committee. Then the researcher pointed out worrisome problems therein and presented suggestion" to improve problematic situations. First of all, the researcher examined the following items which are major points in the aforementioned Act: 1) Establishment of Korea Medical Dispute Mediation and Arbitration Center, 2) Procedures for mediation and arbitration of medical disputes, 3) Establishment of Medical Injury Compensation Association, 4) Introduction of proxy payment for damages, 5) Compensation for no-fault medical accidents, 6) A system concerned with special cases on criminal punishment. Next, the researcher closely reviewed the following possible issues: 1) Limit of arbitrary mediation, 2) Postponement of the system concerned with special case on criminal punishment, 3) Examination of reasons for rejection, 4) Function and role of the Appraisal department, 5) A possibility of being reduced to an evidence collection procedure for lawsuit, 6) A possibility of no-fault compensation rather than injury compensation, 7) Operational issues related proxy payment for damages. Lastly, the researcher presented suggestions on how to improve each problematic issue.

• Applied Chemistry for Engineering
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• v.29 no.4
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• pp.363-368
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• 2018

Polyoxometalates (POMs) have outstanding properties and a great deal of potential for electrochemical applications. As POMs are highly soluble, the implementation of POMs in various functional materials is required to fully use their potential in electrochemical devices. Here, we will review the recently developed immobilization methods to incorporate POMs into conductive nanomaterials, such as nanocarbons and conducting polymers. Various immobilization strategies involve POMs entrapped in conducting polymer matrix and integration of POMs into nanocarbons using a Langmuir-Blodgett technique, a layer-by-layer self-assembly, and an electrochemical in-situ polymerization. In addition, we will review a variety of electrochemical applications including electrocatalysts for water oxidation, lithium-ion batteries, supercapacitors, and electrochemical biosensors.

• Asian Oncology Nursing
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• v.11 no.2
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• pp.116-126
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• 2011

Purpose: This study was to analyze the characteristics and effect size of intervention studies that used acupressure for the control of chemotherapy-induced nausea and vomiting (CINV). Methods: Nine electronic databases including Korea Education Research and Information, the National Assembly Library, KISS, Korea Med, NDSL, PubMed, EBSCO, Cochrane library, and OVID (to December, 2009) were searched. Thirteen studies of randomized controlled trials (RCTs) or controlled clinical trials (CCTs) were selected. Data were analyzed by SPSS/WIN 18.0. Results: Overall effect size of acupressure was moderate (0.684). Nausea had a moderate effect size (0.770) and nausea and vomiting had a high effect size (0.899). Acupressure using sticker needles had a high effect size (1.368) among finger acupressure, si-acupuncture, and wrist band treatment. Conclusion: This study suggests that acupressure using sticker needles on the spots of nei-guan, chok-samni and hap-kok can reduce the levels of nausea and vomiting in cancer patients receiving chemotherapy. For improving the reliability of the meta-analysis results, further randomized controlled trials with better study methodology are needed.

• Journal of Engineering Education Research
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• v.23 no.2
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• pp.31-42
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• 2020

This study aims to analyze the research trends of female engineering students focused on domestic research and to suggest implications for future researches. For this purpose, 67 domestic researches (academic articles & graduate theses) which were published since 1996 were collected using the academic research information service and the National Assembly Library search service. All of these 67 researches have been reviewed and classified according to analytical criteria such as publication year, research method, journal's research field and research subjects. Our findings show that firstly, related research on female engineering students has been growing since 1996. Secondly, there were more researches of both academic journals and graduate theses, using quantitative method compared to those with the other research methods. Thirdly, the research themes could be classified as follows: gender-awareness, female engineering students'(hereafter, FES) psychological variables, customized education for FES, career related variables, FES's properties and counselling for them. Fourth, regarding the result of analysis on the research topic, 41.79% of the researches were related to FES's 'career' related factors as well as diverse correlates. Based on these findings, it is necessary to continue studying on FES using various research methods as well as adopting different research perspectives. Also, practical and educational treatments for FES are required with particular attention to their individual variables.