• Proceedings of the KAIS Fall Conference
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• 2003.06a
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• pp.110-112
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• 2003

본 논문에서는 상용 CAD시스템을 이용하여 공구 및 인서트를 모델링하고, 절삭이론 및 유한요소법을 사용하여 인서트의 온도분포를 계산하였다. 절삭이론을 이용하여 절삭실험 없이 인서트 끝단의 온도를 계산하고, 이를 하중 조건으로 사용하여 공구의 온도분포를 얻을 수 있었다. 또한 공구 홀더 끝 부분의 여러 가지 온도 경계조건에 대하여, 공구 및 인서트의 온도분포가 계산되었다. 다양한 경계조건에 따른 인서트의 온도분포에 대한 지식은 공구설계 및 가공조건 설정시 유용하게 이용될 수 있으며 특히 어떠한 절삭실험 얼이 계산이 가능하므로 가공공정설계시 효과적으로 이용될 수 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.12
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• pp.4735-4741
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• 2010

The ultrasonic metal welding is highly used in extensive field due to the possibility for welding of various materials such as new materials, plated structures and etc, and its welding conditions has been diversify. In this paper, one-wavelength tool horn of step type designed for ultrasonic metal welding of dissimilar metal sheets has performed by FEM analysis. FEM analysis is applied to predict the natural frequency of ultrasonic tool horn and use of in the optimal design of ultrasonic horn shape. And the optimal design of one-wavelength step horn is confirmed experimentally using natural frequency analysis system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.8
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• pp.4790-4795
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• 2014

The machine tool is used widely to manufacture and trial manufactured goods in many machinery industries. Blast-induced ground vibration may have an environmental impact, such as damage to the adjacent structures and facilities. This study examined the influence of blast vibration on the accuracy of machine tools. The blast vibration and vibration of machine tools was measured to evaluate the influence of blast vibration on machine tools. Based on the evaluation of the vibration limit of machine tools, the vibration criteria for machine tools in this study were SLIGHTLY ROUGH~ROUGH. By repeated blast vibration, machine tools are more likely show reduced accuracy.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.2
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• pp.685-693
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• 2012

The purpose of this study was to develop a dysphagia assessment tool and a intervention program for elderly in the long-term care facilities and to evaluate its effect. The dysphagia assessment tool consists of 20 items was developed through literature review, previous studies and discussion with nursing/medical members. The intervention program consisted of 72 items and participants for evaluation were 50 elders who were registered at long-term care facilities in 4 regions of Seoul. Collected data were analyzed using SPSS Statistics 18.0 and Spearman's Correlation, t-test, and $x^2$-test. After the application of the dysphagia assessment tool and intervention program, the weight in experimental group was increased (t=4.913, p=.000) and the total time of swallowing was reduced (t=-4.557, p=.000) than control group. These findings were statistically significant. Considering these results, by applying the dysphagia assessment tool and the intervention program, the lives of the elderly in long-term care facilities are expected to be improved and emergency situations such as aspiration pneumonia and asphyxia will be decreased.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.10
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• pp.4713-4718
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• 2013

Nowadays, three-dimensional computer added design(3D CAD) tool are widely and actively used for design of mechanical machine. Because using the tool is more effective to understand design concept and to collaborate with other operation than using two-dimensional design tool. In this study, the 3D CAD tool which is called I-DEAS was applied for three-dimensional modeling of main parts and assembling of modeled parts for identification the entire shape of a injection molding machine. In addition, a study was also performed regarding reduction for the weight of main plates for saving production cost and energy in the machine. A finite element method(FEM) program in I-DEAS tool was used for the improvement study. First, the current main plates were structural analysed and then the plate deformations, weak regions and stress distributions were graped. By the FEM results, the 2nd improved designing of the plates was conducted such as reinforcement or slimming of the plate wall thickness. The 2nd structural FEM was performed for verification of the redesigned plates and then the FEM results were compared with the 1st FEM's result. The weight of the main plates were averagely reduced approximately 3 - 7%. By these results, it was seemed that the improved plates have a useful availability.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.12
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• pp.652-658
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• 2016

In this paper, the theoretical research and simulation using the Finite Element Method (FEM) to design and form a micro-pattern for an ultrasonic horn is described. The present method is based on an initial design estimate obtained by FEM analysis. The natural and resonant frequencies required for the ultrasonic tool horn used for forming the fine pattern were predicted by finite element analysis. FEM analysis using ANSYS S/W was used to predict the resonant frequency for the optimum technical design of the ultrasonic horn vibration mode shape. When electrical power is supplied to the ultrasonic transducer, it is converted into mechanical movement energy, leading to vibration. The RFID TAG becomes the pattern formed on the insulating sheet by using the longitudinal vibration energy of the ultrasonic tool horn. The FEM analysis result is then incorporated into the optimal design and manufacturing of the ultrasonic tool horn.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.2
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• pp.129-136
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• 2016

This was a methodological study that verified the validity and reliability by translating and modifying the Korean Version of LRM (leader rapport management) tool. This study verified the content validity, construct validity, concurrent validity and convergent validity on 200 nurses working in general hospitals. The LRM tool was analyzed using a total of 3 factors (ego, autonomy, association) and 12 items. The reliability of this tool (Cronbach's ${\alpha}$) was 0.83 to 0.86. The tool showed a high level of reliability and validity. The difference from preceding studies showed that the LRM is a measurement tool that considers multi-dimensional aspects, and it can provide the basic material of report management methods in diverse aspects for clinical nurse managers.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.12
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• pp.5531-5540
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• 2011

The Learning Models including the design principle about web 2.0 use in education has been recently presented. In types of web 2.0 tools, blogs are the best tool that reflected the trends of web 2.0 and these are able to share a lot of information and contents. To invent new learning methods involving web 2.0, this study aims to get the results about effectiveness of learning performance on a supplementary learning tool based on blog using learner-centric UI/UX design in higher education. As a study tool, installation-type blog that can be designed as user-centric system is applied to experimental environment. This study presents the conclusion that supplementary learning tool based on blog using learner-centric UI/UX design influences on learning achievement and learning flow through the analysis of questionnaire results of learners, learning evaluation score of learners and assignments evaluation score of learners.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.2
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• pp.471-477
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• 2012

SCM420 steel tempered after performing gear hove PACVD carbide coating on the surface after the cutting surface hardness was high. Difficult-to-cut, without coating is classified as mild as large, including materials like mild, high strength that improves tool life and productivity have limited availability. Drive to improve it in the TiCN-coated carbide call for war to the finish coating on cutting a hob skiving good workability, tool wear less, 2.5-fold increase in tool life results were obtained. Experiments using CNC Skiving hobbing machine with wet cutting conditions, cutting speed and feed rate to apply a variety of the tool wear and surface roughness data were obtained. Results from condition 2 (V = 200m/min F = 0.7mm/rev) cutting speed feed mark the cutting surface microstructure and surface roughness Rmax $4.7{\mu}m$(Ra $1.19{\mu}m$) of the data was obtained.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.11
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• pp.5033-5043
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• 2012

The purpose of this study is to complement the problem of lecture evaluation items and to improve the lecture evaluation items to fit to original purpose of lecture evaluation to enhance the lecture's quality. For this, meanings of good teaching, lecture evaluation domains and elements of preceding study, the contents and problems of lecture evaluation tools in A college were searched, and in this foundation, an improved lecture evaluation tool was suggested. As the result of this study, important features of the improved tool are followed: First, the compositions of evaluation domains, evaluation elements, and evaluation items were reconstituted. Second, to acquire the important information for the better lecture, the items were devised according to the features of good teaching in colleges. Third, the items concerned of evaluation elements which is commonly suggested by the lecture evaluation tools of preceding study were developed. Forth, if there is the information which is required for the enhancement of the lecture quality, the items were developed though the result could not be presented in the arithmetical means. Fifth, evaluation items to improve the problems of lecture evaluation tools which had been carried out in A college were developed.