• Journal of the Korean Society for Railway
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• v.20 no.3
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• pp.320-328
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• 2017

In order to analyze the influence on derailment safety according to the aging of primary rubber springs widely applied to railway vehicles, characteristic tests were carried out on aged primary rubber spring samples. To analyze the effect of primary rubber spring aging on derailment safety, a vehicle dynamic analysis was carried out. The results of the vertical characteristics test for the rubber spring specimens with 17 years of service life revealed that the displacement restoration function was degraded due to rubber aging and the spring stiffness significantly increased. The results of the running dynamic analysis simulating the twist track running in accordance with the EN14363 standard, compared with the normal vehicle model (Case 1), showed that the derailment coefficient and the wheel unloading of the vehicle model (Case 2) using the aging primary spring characteristic increased, and the derailment safety was degraded. IN particular, it was found that the derailment safety due to the reduction of the wheel load is weak in the transient section where a steep slope change occurs.

• Cartoon and Animation Studies
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• s.19
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• pp.65-88
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• 2010

The purpose of this article is to investigate the relation the animation to culture archetype, focusing on the case of the matter for animation content creation. Furthermore, in the paper, we also study about the animation industry development using various cultural archetypes such as the tale, myth, legend, folk tale, which are usable for animation content industry. For purposes of this study, we analyzed the aspects of power of folk tale and the essential vitality of folk tale in KBS Satellite Channel's and Michel Ocelot's $\grave{e}$re>. Above all, the origin of literature, folk tales are characterized by their uniqueness of each people as well as the global universality, being reproduced over and over again in oral literature. In the existent mode, folk tales have a firm structure because of storytelling, and have characteristics of performance and tradition on the basis of this structure. These characteristics can make emotional experience deepen and insure quality of narrative experience through direct communications. In this context, comparing folk tales of diverse forms of each nation and discovering the ethnicism and universality would not only be critical in the animation content development aspects, but provide precious data for effective animation marketing to apply One Source-Multi Use.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.10 no.1
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• pp.119-128
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• 2015

The role and importance of entrepreneurship is fast becoming recognized with the topic of creative economy in Korea. Especially, young generations having difficulties of finding a job choose to be an entrepreneur as a part of their career choice due to the changes in social awareness about entrepreneurship and the increase of entrepreneurship education opportunity. It is needed to approach with the analysis of young people's career choice reasons in order to provide effective entrepreneurship education to those who has the choice of career ahead. Each student has different desire to entrepreneurship lecture and education with the basis of their own motivation and goal of career choice reasons. The objective of this study is to examine career choice reasons with 1,651 science and engineering field students in universities to determine the sustainable needs of entrepreneurship education. As a result of the analysis, there is significant relationship between the satisfaction of entrepreneurship education and the intrinsic factors such as self-realization, innovativeness, role-model and independence. In addition, the satisfaction of entrepreneurship education is significantly related to the sustainable desire of entrepreneurship education. In other words, it is needed to enhance intrinsic value of the students' career choice reasons for sustainable entrepreneurship education due to successful start-ups requiring to have information and understanding process of business which comes from continuous entrepreneurship education.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.10 no.6
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• pp.27-36
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• 2015

The purpose of this study was to investigate the influence relationships among individual career orientation, preparation of old age, social networks, and the entrepreneurial intention of the potential entrepreneurs. 408 numbers of structured questionnaire were collected from the potential entrepreneurs who live in Seoul through the online Google survey method and offline face to face method. And the collected data was analyzed on frequency analysis, validity analysis, t-test, ANOVA, and regression analysis etc. using the SPSS WIN 21.0 program. The results are as follows. Firstly, innovation, entrepreneurial creativity, and autonomy orientation affect on entrepreneurial intention positively(+), but security orientation has a negative(-) effect on entrepreneurial intention in the influence relationships between individual career orientation and entrepreneurial intention. Secondly, economical and emotional preparation have positive(+) influences on entrepreneurial intention in the influence relationships between individual career orientation and entrepreneurial intention. Thirdly, the sub-variables of social networks, that is, assist and role models exert a positive(+) influence on entrepreneurial intention in the influence relationships between social networks and entrepreneurial intention. Fourthly, social networks plays a moderating role only on the relationship between security orientation and entrepreneurial intention in the analysis about the moderating effects of social networks on the influence relationships among individual career orientation, preparation of old age, and entrepreneurial intention. Fifth, a social network of relationships to help prepare the old establishment has been found to help regulate effective analysis of whether or not the results of adjustment.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.44 no.7
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• pp.552-561
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• 2016

In this experimental study, the dynamic stability derivatives of a tailless lambda-shape UAV are estimated from time history data of aerodynamic moments measured from the internal balance while the test model is forced to oscillate at given frequencies and amplitudes. A 3-axis forced oscillation apparatus is designed to induce decoupled roll, yaw, pitch oscillations respectively. The results show that the roll damping derivatives remain stable at the entire range of angle of attack tested, whereas the pitch damping derivatives become unstable beyond $15^{\circ}$ angle of attack. The amplitude and frequency have little impact on roll damping derivatives while the smaller amplitude and frequency of oscillation improves the pitch stability. The yaw damping derivative values are fairly small as expected for a tailless configuration. The results indicate that the proposed methodology and test apparatus area valid for estimating the dynamic stability derivatives of a tailless UAV.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.14 no.5
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• pp.141-157
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• 2019

The purpose of this study was to verify the effects of personal characteristics and military service experience on their entrepreneurial intention. Hypotheses were developed based on extant literature and tested using the data collected by surveys to retiring officers and NCOs. The conclusions drawn from the analysis were as follows. First, the major factors affecting the voluntary self-employment intention are role model, perceived desirability, and working environment. Second, the biggest difficulty in preparing to start a self-employed business is the lack of founding capital and entrepreneurial information. Third, the respondents believe that military career is not helpful in starting a business. Fourth, there were many negative perceptions that the education and training from the military does not help the self-employment. As a result, it is believed that improvement of entrepreneurial education in the military and expansion of entrepreneurial education during service are required. Especially, the education focusing on self-employed entrepreneurship should be improved. It is recommendable that the entrepreneurial education now being carried out by the Military Outplacement Training Institute should be extended not only during the outplacement period but also the normal service period, thereby increasing the intention of the military official.

• KIPS Transactions on Computer and Communication Systems
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• v.6 no.11
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• pp.445-452
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• 2017

Electric pole is a supporting beam used for power transmission/distribution which accelerometer are used for measuring a external force. The meteorological condition has various effects on the external forces of electric pole. One of them is the elasticity change of the aerial wire. It is very important to perform modelling. The acceleration sensor is converted into a pitch and a roll angle. The meteorological condition has a high correlation between variables, and selecting significant explanatory variables for modeling may result in the problem of over-fitting. We constructed high deviance explained model considering multicollinearity using the Generalized Additive Model which is one of the machine learning methods. As a result of the Variation Inflation Factor Test, we selected and fitted the significant variable as temperature, precipitation, wind speed, wind direction, air pressure, dewpoint, hours of daylight and cloud cover. It was noted that the Hours of daylight, cloud cover and air pressure has high explained value in explonatory variable. The average coefficient of determination (R-Squared) of the Generalized Additive Model was 0.69. The constructed model can help to predict the influence on the external forces of electric pole, and contribute to the purpose of securing safety on utility pole.

• Korean Journal of Remote Sensing
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• v.33 no.5_2
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• pp.631-640
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• 2017

The estimation of rice yield affects the income of farmers as well as the fields related to agriculture. Moreover, it has an important effect on the government's policy making including the control of supply demand and the price estimation. Thus, it is necessary to build the crop yield estimation model and from the past, many studies utilizing empirical statistical models or artificial neural network algorithms have been conducted through climatic and satellite data. Presently, scientists have achieved successful results with deep learning algorithms in the field of pattern recognition, computer vision, speech recognition, etc. Among deep learning algorithms, the SSAE (Stacked Sparse AutoEncoder) algorithm has been confirmed to be applicable in the field of forecasting through time series data and in this study, SSAE was utilized to estimate the rice yield in South Korea. The climatic and satellite data were used as the input variables and different types of input data were constructed according to the period of rice growth in South Korea. As a result, the combination of the satellite data from May to September and the climatic data using the 16 day average value showed the best performance with showing average annual %RMSE (percent Root Mean Square Error) and region %RMSE of 7.43% and 7.16% that the applicability of the SSAE algorithm could be proved in the field of rice yield estimation.

• Journal of the Korean Applied Science and Technology
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• v.36 no.4
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• pp.1188-1197
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• 2019

Exposure to stress can lead to sympathetic hyperactivity, which include a systemic disease with lesions in a broad spectrum of organs and a psychiatric condition. The purpose aimed to evaluate the effect of the korea ginger essential oil on stress hormone and brain tissue response in chronic mild stress-induced rats model of sympathetic hyperactivity. Evaluation method carried out cytotoxicity assessment and component analysis, what observe the effects based on serum biomarker and histopathological analysis of brain tissue. As this time, the korea ginger essential oil was treatment at doses of 100 nl/㎖ for 2 weeks after make a chronic mild stress-induced rats model of sympathetic hyperactivity. As a result, the korea ginger essential oil was not toxic at less than 100 nl/㎖, contents of 6-gingerol was 345 ppm. Compared to the control rats, the korea ginger essential oil treatments significantly reduced the serum concentrations of stress hormone (i.e., ACTH, corticosterone, melatonin). Furthermore, The korea ginger essential oil treatments effectively preserved the TH-immune response was occasionally interrupted in the ventral tegmental area (VTA) and the substantia nigra pars compacta (SNpc). The results indicate that the korea ginger essential oil improved sympathetic hyperactivity. Thus, the korea ginger may be a novel material of aroma oils for the management of sympathetic hyperactivity.

• Ecology and Resilient Infrastructure
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• v.3 no.4
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• pp.231-237
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• 2016

The purpose of this study is to analyze phosphate adsorption characteristic of the filter media applied in water purification technology. And it is also to observe the removal efficiency of the technology that was developed by combining the purification abilities of filter media and the vegetation mat. The filter media, Adphos, is the subject of this study. The result of adsorption test shows that $PO_4{^{3-}-P}$ adsorption characteristics of Adphos is determined by the Langmuir isotherm model fitting and the $q_m$ (maximum adsorption amount) value is calculated as 1.162 mg/g. To verify the removal efficiency of the purification technology, a lab-scale reactor, including a 400 mm depth of filter bed filled by Adphos, was manufactured. Yellow flag Iris (Iris pseudacours L.) was planted on the vegetation bed and the coir-roll was used to fix the root of vegetation. The reactor ran 8 hours per day over 71 days, and the results of filtration experiment show that average removal efficiency of SS, T-N and T-P were calculated as 94%, 41% and 64% respectively. With these results, it was proved that the purification technology is highly effective. And for the long-time use, a maintenance guide is also required.