• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.565-566
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• 2012

• Transactions of Materials Processing
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• v.12 no.4
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• pp.401-407
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• 2003

This paper newly proposes a mesh regularization method for the enhancement of the efficiency in sheet metal forming analysis. The regularization method searches for distorted elements with appropriate searching criteria and constructs patches including the elements to be modified. Each patch is then extended to a three-dimensional surface in order to obtain the information of the continuous coordinates. In constructing the surface enclosing each patch, NURBS(Non-Uniform Rational B-Spline) surface is employed to describe a three-dimensional free surface. On the basis of the constructed surface, each node is properly arranged to form unit elements as close as to a square. The state variables calculated from its original mesh geometry are mapped into the new mesh geometry for the next stage or incremental step of a forming analysis. The analysis results with the proposed method are compared to the results from the direct forming analysis without mesh regularization in order to confirm the validity of the method.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2003.05a
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• pp.339-342
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• 2003

This paper newly proposes a mesh regularization method for the enhancement of the efficiency in sheet metal forming analysis. The regularization method searches for distorted elements with appropriate searching criteria and constructs patches including the elements to be modified. Each patch is then extended to a three-dimensional surface in order to obtain the information of the continuous coordinates. In constructing the surface enclosing each patch, NURBS(Non-Uniform Rational B-Spline) surface is employed to describe a three-dimensional free surface. On the basis of the constructed surface, each node is properly arranged to form unit elements as close as to a square. The analysis results with the proposed method are compared to the results from the direct forming analysis without mesh regularization in order to confirm the validity of the method.

• Proceedings of the Materials Research Society of Korea Conference
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• 2012.05a
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• pp.58.1-58.1
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• 2012

Direct write technologies provide flexible and economic means to manufacture low-cost large-area electronics. In this regard inkjet printing has frequently been used for the fabrication of electronic devices. Full advantage of this method, which is capable of reliable direct patterning with line and space dimensions in the 10 to 100 um regime, is only made with all-solution based processing. Among these printable electronic materials, silver and copper nanoparticles have been used as interconnecting materials. Specially, solutions of organic-encapsulated silver and copper nanoparticles may be printed and subsequently annealed to form low-resistance conductor patterns. In this talk, we describe novel processes for forming silver nanoplates and copper ion complex which have unique properties, and discuss the optimization of the printing/annealing processes to demonstrate plastic-compatible low-resistance conductors. By optimizing both the interconnecting materials and the surface treatments of substrate, it is possible to produce particles that anneal at low-temperatures (< $200^{\circ}C$) to form continuous films having low resistivity and appropriate work function for formation of rectifying contacts.

• Design & Manufacturing
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• v.17 no.1
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• pp.40-47
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• 2023

Macular degeneration and glaucoma are representative age-related retinal diseases that rank second and third in the prevalence of retinal diseases, and are a kind of degenerative neurological disease. Irreversible visual acuity and visual field damage may occur, and the number of patients is rapidly increasing as the population ages. Since this retinal disease is a chronic disease, continuous drug treatment is required. There are various drug delivery methods for treatment, but direct injection of the drug into the intravitreal is the most effective for continuous delivery of the drug over a long period of time. In order to solidify Dexamethasone, a retinal disease treatment, and insert it into the primary intravitreal, it is important to develop a technology to miniaturize the treatment and an applicator to deliver the treatment. In this study, a mold technology was developed to integrate the cannula and hub, which are one part of applicator. In addition, surface treatment was performed on the outside of the cannula to improve the bonding strength between the cannula and the hub, and the bonding strength according to each condition was analyzed through a tensile test.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2004.10a
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• pp.241-245
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• 2004

Among the various manufacturing processes of composites, the tape lay-up process of thermoset prepreg has many advantages compared to autoclave or hot press forming. It has a high potential to process automation and continuous fabrication .. Fiber placement developed as a logical combination of filament winding and automated tape placement to overcome some of the limitations of each manufacturing method. Fiber placement uses a compaction device to apply direct contact between the incoming materials in the fiber placement head and Heat is added to the materials at the nip point of the compaction roller. This paper will discuss property of thermoset composite as compaction and heat effect in Automated fiber placement

• Journal of the Korean Society for Precision Engineering
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• v.28 no.7
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• pp.769-776
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• 2011

In order to cope with the requirements of smaller patterns, larger surfaces and lower costs in the fields of displays, optics and energy, greater attentions is now being paid to the development of micro-pattern machining technology. Compared with flat molds, roll molds have the advantages of short delivery, ease of manufacturing larger surfaces, and continuous molding. This paper presents the state-of-the-art of the micro pattern machining technology on the roll molds and introduces some research results on the machining process technology. The copper and nickel-phosphorous-alloy plating process, machining process technology for uniform micro patterns. micro cutting simulation and the real time monitoring system for micro machining are summarized. The developed technologies have led the complete localization of the prism sheets and will be applied to the direct forming process with succeeding research & development.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.32 no.9
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• pp.754-760
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• 2008

A two-photon induced photoreduction process suggests a possibility for fabricating complicated metallic microstructures which can be applied to 3-D micro-circuits and optical devices, etc. The process employs the photoreduction of silver ions in a metallic solution which is composed of metallic salt ($AgNO_3$) and watersoluble polymer ((poly(4-styrenesulfonique acid) 18wt. % in $H_2O$, $(C_8H_8O_3S)_n$)). In this process, the improvement of the resolution and the uniformity of fabricated metallic structures are important issues. To address these problems, continuous forming window (CFW) is obtained from a parametric study on the conditions of laser power and scanning velocity and the direct seed generation (DSG) method is proposed. Silver nano particles are uniformly generated in a metallic solution through the DSG method, which enables the decrease of a laser power to trigger the photoreduction of silver ions as well as the increase of metal contents in a metallic solution. So the two-photon induced photoreduction property of a metallic solution is improved. Through this work, precise silver patterns are fabricated with a minimum line width of 400 nm.

• Journal of Korean Academy of Nursing
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• v.26 no.2
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• pp.443-466
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• 1996

Young children need continuous care and fostering by their family. They help children organize and develop their potential and grow to be and integrated individuals. Children are influenced by then family at first and continuously when they grow up and develop their capability. Especially, mothers spend a lot of time with time to their children, encourage children's growth, give advice, and do their best to take care of their children. The ethnographic study is to understand the patterns and rules of human behaviors. This study utilized this method in order to interpret the maternal health promoting behaviors for their children. The data were collected through the participant observation and direct interview for about 18 months in P city. The participants were 7 mothers, from 32 to 37 years old. They have children of ages 3 to 10 and 1 or 2 children in total. The data were analyzed through the Spradley's Ethnographic method and the results were summarized as follows : The viewpoints which influence maternal health promoting behaviors include “having childlike appearance”. “having childlike character”, “living without illness”, and “eating well”. The maternal health promoting behaviors for children are classified as “adapting to nature”, “supporting of ability”, “sharing with the family”, “training”, and “praying”. The adapting behaviors include “recognizing child's innate character”, “controlling maternal desires”, “preparing natural food”, which includes breast feeding. The supporting behaviors include “recognizing childlikeness”, “empowering”, and “restricting certain actions to preventing accidents”. In order to promote child's health, it is essential to promote mother's health first of all. The sharing with the family includes “promoting family concord or acquaintanceships concord” and “adapting to circumstances beyond family”. The training behaviors include “forming good habits” and “having good moral value”. It is very important to form good habits in childhood. The praying behavior include “waiting for opportunities” and “endeavoring activity to promote child's health”. The above 5 behaviors by mothers appeared to be able to promote children's health. The results of this study can be utilized to provide the basic information necessary to develop the patterns of maternal health promoting behaviors consistent with our culture and can contribute us develop the body of knowledge about the maternal health promotion for children in nursing.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.6
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• pp.1856-1868
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• 2008

This paper is about what is the effect of cultural marketing - which is affecting business ethics and social responsibility - on corporate image and formation of brand asset, and about which is getting more influence by cultural marketing among factors that is forming corporate image and brand asset. The results are like below. First, cultural marketing activities had an indirect influence on the corporate brand asset. Second, cultural marketing had an direct influence on the corporate brand image. Third, cultural marketing had a positive impact on reminding of the brand image. Fourth, social responsibility and business ethics had an indirect influence on the brand loyalty. Fifth, corporate social responsibility and business ethics had a positive impact on the brand image. Sixth, among the corporate social responsibility, community activities played a control variables. Seventh, regarding the characteristics of the respondents it showed that there's perception gaps among marketing, responsibility and ethics as well as brand assets. All in all, cultural marketing had an indirect effect on formulating corporate brand asset by the means of corporate image. The result is pointing out the importance of establishing a strategic marketing plan that is taking harmony between the character of cultural marketing and media, continuous and long-term plan, connection with the type of the brand asset into account. Moreover, as people realized that corporate business activities are brining not only economic consequences, such as providing goods and services but also social consequences, such as uneven distribution of wealth, dirty links between business and politics, consumers' security, pollution, and etc., companies are reconsidering its own role in society. This reconsideration is called corporate social responsibility and this pushed the company to keep business ethics together with their business.