• Journal of the Korean Society of Manufacturing Process Engineers
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• v.9 no.5
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• pp.76-82
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• 2010

In this study, we carried out to evaluate the shock-proof of a large scale motor for the naval vessel using dynamic design analysis method (DDAM) and full transient dynamic analysis. Analytical models for main assemblies (motor frame, rotor and stator assembly) were consisted of the tetrahedral solid elements and the equipments which installed in the upper side of the motor were substituted the mass elements. And we also modelled resilient mounts of a motor using the beam elements with appropriate directional stiffness. The DDAM was conducted according to NRL memorandum report 1396 and the full transient dynamic analysis was performed applying directional triple half triangle shock wave to the motor using ANSYS 12. As a result, we could compare of the results according to each analytic method and find the motor to satisfy the design criteria of the maximum stress and deformation.

• Journal of The Korean Association of Information Education
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• v.10 no.2
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• pp.183-190
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• 2006

This study is mainly focused on objective evaluating the influence of the e-NIE activities on the elementary students' ICT competence which is considered as a critical feature in contemporary society. An e-NIE site which is covering 5 domains of ICT competence was constructed to support the students' e-NIE activities. An ICT competence evaluating questionaire was made to confirm the result of the e-NIE activities and the evaluation and the analysis were performed before and after the e-NIE activities. The result shows that the e-NIE activities can enhance elementary students' ICT competence.

• Journal of Surface Science and Engineering
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• v.48 no.6
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• pp.354-359
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• 2015

Stainless steel has poor corrosion resistance in marine environment due to the breakdown of a passive film caused by chloride. It suffers electrochemical corrosion like pitting corrosion, crevice corrosion, and stress corrosion crack (SCC) in marine environment. In general, it indicates that the passive film of $Al_2O_3$ has better corrosion resistance than that of $Cr_2O_3$ in seawater. This paper investigated the damage behavior 304 stainless steel and hot-dip aluminized 304 stainless steel in seawater solution. Various electrochemical experiments were carried out including potential measurement, potentiodynaimic experiment, Tafel analysis and galvanostatic experiment. As a result of anodic polarization experiment, higher pitting damage depth was indicated at 304 stainless steel than hot-dip aluminized 304 stainless steel. In addition, relatively higher corrosion current density was shown at hot-dip aluminized stainless steel as a result of Tafel analysis.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.64 no.12
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• pp.1673-1678
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• 2015

This paper describes magnetic field on power cable in underground transmission systems. Based on specification which is being used in domestic power utility, magnetic field was analyzed in accordance with line arrangement, line burial depth and phase spacing. Magnetic field magnitude and its trend were understood in each circuit type such as double circuits, triple circuits and quadruple circuits of underground transmission systems. In addition, magnetic field was analyzed according to phase arrangement changing in each circuit. Finally, the proper phase arrangement configuration type was suggested by the evaluation of analysis result. Magnetic field was calculated by using Biot-Savart's law. According to the evaluated magnetic fields based on phase layout configuration in each circuit, it figured out that each of magnetic fields was different. As a result, this paper proposes a proper phase layout configuration for generating minimum magnetic field. It is evaluated that the phase layout configuration in each circuit proposed in this paper can be used at actual underground transmission systems.

• Nuclear Engineering and Technology
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• v.35 no.2
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• pp.154-164
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• 2003

The explicit consideration of different pressurization rates in estimating the probabilities of containment failure modes has a profound effect on the confidence of containment performance evaluation that is so critical for risk assessment of nuclear power plants. Except for the sophisticated NUREG-1150 study, many of the recent containment performance analyses (through Level 2 PSAs or IPE back-end analyses) did not take into account an explicit distinction between slow and fast pressurization in their analyses. A careful investigation of both approaches shows that many of the approaches adopted in the recent containment performance analyses exactly correspond to the NUREG-1150 approach for the prediction of containment failure mode probabilities in the presence of fast pressurization. As a result, it was expected that the existing containment performance analysis results would be subjected to greater or less conservatism in light of the ultimate failure mode of the containment. The main purpose of this paper is to assess potential conservatism of a plant-specific containment performance analysis result in light of containment failure mode probabilities.

• Korean Journal of Human Ecology
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• v.16 no.4
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• pp.783-800
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• 2007

This study examined the evaluation on the consumers' voluntary anti-sites on on-line from the people concerned, such as the people of an enterprise, a consumer organization, and the consumer. We collected the data using in-depth interview of qualitative analysis. The in-depth interviews were carried out for about two hours in each respondent. Total 15 respondents, 5 in each part of three parts such as an enterprise, a consumer organization, and the consumer, were answered a interview. The data was analysed by content analysis method. As the result of this study, the people concerned to enterprises answered that anti-sites helped the enterprises through the objective and the constructive criticism. The consumers participating in the anti-sites also answered that the existence of anti-sites helped the companies to know the complaint and the dissatisfaction with their goods or services. We suggest the followings for the desirable consumers' voluntary anti-sites through this study. First, the companies need to recognize that the anti-sites help the companies because the anti-sites give the companies the information of improving the product and the corporate management. Second, people concerned to the consumer organizations need to take a neutral role so that the consumer members of anti-sites demand a proper compensation to the companies and receive the reasonable compensation. Third, the anti-sites' managers should give information to the consumer members of the anti-sites continuously, operate the anti-sites actively such as answering a question and managing their members. Fourth, the consumer members of anti-sites should have active attitude in participating in an anti-sites from exchanging various information to uploading their information.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.39 no.2
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• pp.351-359
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• 2019

In order to improve the problem of parking which is getting worse day by day, the municipality carries out a survey on the actual situation of the parking lot supply and demand periodically according to the related law. However, in the existing evaluation method, the parking demand that occurs under the condition that the demand is suppressed by the parking supply and regulation due to the limit of the survey method is investigated. In addition, the analysis is conducted only for the present year, and prediction and analysis of future parking problems are limited. Therefore, we propose a method to evaluate the status of parking supply and demand, which is differentiated to improve the problem of the existing evaluation method. As a result, comparing the existing method with the improved method, it can be seen that the improved evaluation method can be useful for establishing the long-term parking policy for the improvement of parking problems.

• Journal of the Korean Society for information Management
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• v.40 no.4
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• pp.1-31
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• 2023

This study conducted user experience evaluation by introducing various text mining techniques along with topic modeling techniques for mobile menstrual cycle measurement applications that are closely related to women's health and analyzed the results by combining them with a honeycomb model. To evaluate the user experience revealed in the menstrual cycle measurement application review, 47,117 Korean reviews of the menstrual cycle measurement application were collected. Topic modeling analysis was conducted to confirm the overall discourse on the user experience revealed in the review, and text network analysis was conducted to confirm the specific experience of each topic. In addition, sentimental analysis was conducted to understand the emotional experience of users. Based on this, the development strategy of the menstrual cycle measurement application was presented in terms of accuracy, design, monitoring, data management, and user management. As a result of the study, it was confirmed that the accuracy and monitoring function of the menstrual cycle measurement of the application should be improved, and it was observed that various design attempts were required. In addition, the necessity of supplementing personal information and the user's biometric data management method was also confirmed. By exploring the user experience (UX) of the menstrual cycle measurement application in-depth, this study revealed various factors experienced by users and suggested practical improvements to provide a better experience. It is also significant in that it presents a methodology by combines topic modeling and text network analysis techniques so that researchers can closely grasp vast amounts of review data in the process of evaluating user experiences.

• Journal of Applied Tourism Food and Beverage Management and Research
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• v.16 no.2
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• pp.201-216
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• 2005

This study investigated of the differences of the image between the domestic and china tourist of the visiting in busan metropolitan city and their image evaluation were different according to the nationality. The attribute for the destination image types were measured using 27 items. The factors involved in the destination image were analysis and 7 factors emerged. The result are as follows. First, Between the domestic and china tourist of living appeared to statistical different of the destination image. Second, Between destination image and revisiting preference appeared to statistical difference. Third, Between destination image and revisiting preference appeared to statistical difference according to the nationality. Forth, Between destination image and revisiting preference appeared to statistical partially difference according to the nationality. Finally it is also appeared to the statistical difference on the job. ANOVA, t-test was utilized for the above analysis which revealed that a statistic partially difference exited between domestic and china tourist.

• Knowledge Management Research
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• v.13 no.3
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• pp.55-77
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• 2012

Selecting promising technology is becoming more and more difficult due to the increased number and complexity. In this study, we propose hybrid AHP/DEA-AR method and hybrid AHP/DEA-AR-G method to evaluate efficiency of technology alternatives based on ordinal rating data collected through survey to technology experts in a certain field and select efficient technology alternative as promising technology. The proposed method normalizes rating data and uses AHP to derive weights to improve the credibility of analysis, then in order to avoid basic DEA models' problems, use DEA-AR and DEA-AR-G to evaluate efficiency of technology alternatives. In this study, we applied the proposed methods to clean technology and compared with the basic DEA models. According to the result of the comparison, we can find that the both proposed methods are excellent in confirming most efficient technology, and hybrid AHP/DEA-AR method is much easier to use in the process of technology selection.