• Transactions of the Korean Society of Mechanical Engineers A
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• v.39 no.6
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• pp.583-588
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• 2015

Asymptotic method has been often used to theoretically analyze the complete contact problem. The error of the asymptotic results increases as the distance from the contact edge increases. The singularity cannot be properly obtained from a finite element (FE) analysis owing to the finiteness of the element size. In the present work, the complete contact problem in bonded condition is analyzed using a combined experimental-numerical approach to assist and/or compare with the asymptotic results. Al and Cu alloys are used for the material combination of the punch and substrate. 120 and 135 degrees are used for the punch angle. The FE models are validated by comparison of displacement distributions obtained by the FE analysis and $moir{\acute{e}}$ experiment. Generalized stress intensity factors are evaluated using the validated FE models. Stress field in the vicinity of the sharp contact edges obtained from the FE and asymptotic analyses are compared. The discrepancies are also discussed.

• The Journal of the Korea Contents Association
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• v.11 no.8
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• pp.102-111
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• 2011

This paper aimed at smartphone applications of department store brands in order to examine the traits of applications for the brand image. The study carried out survey research with 114 smartphone users who experienced the application of a department store, assuming that the design, contents, ease of use, and community characteristics of the application would affect satisfaction and the brand image. This paper performed a confirmatory factor analysis, correlation analysis, and the test of a model using PLS. Results showed that the design and contents of the application affected the improvement of satisfaction and of a brand image, whereas ease of use did not affect satisfaction and brand image. Also, community was influential on satisfaction, whereas it was not influential on the improvement of a brand image. Satisfaction with the application showed a strong impact on the improvement of a brand image; thus, it was found necessary for upcoming brand applications to enhance satisfaction for building a positive brand image.

• The Journal of the Korea Contents Association
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• v.11 no.10
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• pp.234-241
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• 2011

The recent technology boom has created a new digital age. With the help of information technology consumers can have more power than ever and they use digital contents more than ever. This study relates consumer attitude to the recent digital contents using behavior about digital file-sharing. Through the use of the multimethod approach, we identify four characteristics can affect illegal digital contents using behavior. The methodology used was to take in depth look at the consumer with phenomenology as a qualitative research. We select 6 participants who have experience of digital content using. We also examine the structural configurations of the relationship between digital contents characteristics and illegal downloading intention. We surveyed 200 people who also had experience of digital content. This research gives theoretical and practical implication to the marketers related to online communication.

• The Journal of the Korea Contents Association
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• v.16 no.7
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• pp.179-189
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• 2016

This aim of this study is identify research trends and intellectual structure in the field of Korean journalism and communication studies. For this purpose, a semantic network analysis was employed to analyze keywords in the abstracts of published articles in the Korean Journal of Journalism and Communication Studies from 2005 to 2015. The results showed that "frame", "Twitter", "content analysis" and "social media" are among the most frequently used keywords in the abstracts during this period. With regards to degree and eigenvector centrality, "social capital", "trust" and "twitter" were among the highest. The findings of the periodic characteristics of research trends revealed that there are more studies that employ the traditional media effect theories including Uses and Gratification Theory, Agenda Setting Theory, and Framing Theory before the year of 2010 while those that focus on the specific new media such as smartphones and twitter after 2011. This study has implications in the sense that it can be used as guidelines for making a curriculum or establishing the research system for Korean journalism and communication studies in the future.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.5
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• pp.517-521
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• 2008

A worm is a malware that propagates quickly from host to host without any human intervention. Need of early worm detection has changed research paradigm from signature based worm detection to the behavioral based detection. To increase effectiveness of proposed solution, in this paper we present mechanism of detection and prevention of worm in distributed fashion. Furthermore, to minimize the worm destruction; upon worm detection we propagate the possible attack aleγt to neighboring nodes in secure and organized manner. Considering worm behavior, our proposed mechanism detects worm cycles and infection chains to detect the sudden change in network performance. And our model neither needs to maintain a huge database of signatures nor needs to have too much computing power, that is why it is very light and simple. So, our proposed scheme is suitable for the ubiquitous environment. Simulation results illustrate better detection and prevention which leads to the reduction of infection rate.

• The Journal of Korean Academy of Prosthodontics
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• v.33 no.4
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• pp.769-779
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• 1995

The understanding the nature of occlusal tooth contacts of natural dentition is important for correct diagnosis and treatment of diseases developed in stomatognatic system. Several investigator have studied the distribution of tooth contacts in maximum intercuspation and have repored contact locations with respect to the tooth position. However, there are few report the variation of the occlusal contact point with change in each head position. This study analysed the number of occlusal contact point with change in each head position. 30 subject(male 17, female 13), who ahad natural occlusion and no symptoms of temporomandibular disorder, were selected. The numbers and patterns of tooth contact were recorded by silicone bite registration on stone model at four different head positions with head anguration gauge(from the supine to the upright position). The results obtained were as follows : 1. The numbers of total occlusal contact point on teeth increased to average 25, 29, 35, 42 points as head angulation was changed from the supine to the upright position against the ala-tragus line, and there was significant difference(P<0.05). 2. In the 19 subject(65%)of total 30 subject, the perforated point of the silicone bite indicated that the locus for the prime contact point moved mesially as the head angulation was changed from the supine to the upright position. 3. On the basis of the fact that the anterior occlusal contact point increase as head angulation changed from the supine to the upright position, we could find that the mandibular position is moved anteriorly.

• Journal of the Korean Society of Food Science and Nutrition
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• v.32 no.7
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• pp.971-975
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• 2003

This study was performed to find natural foods with high anti-dementia effects from natural plant resources which have been used for mental health. We screened inhibitors of prolyl endopeptidase which could be implicated in the processing of Alzheimer's disease, the principal part of dementia. One hundred natural foods were examined for prolyl endopeptidase inhibitors. Out of them, methanol extract of Acorns and Raspberry inhibited more than 90% of prolyl endopeptidase activity at 40 ppm. Also, methanol extract of Walnut inhibited 73% of prolyl endopeptidase activity at the same concentration. Therefore, the result suggests that these natural foods may have the potential to be used for preventing and treating dementia like Alzheimer disease.

• Environmental and Resource Economics Review
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• v.25 no.2
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• pp.141-178
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• 2016

This paper, using AMR (Automatic Meter Reading) electricity data accurately measured in real time, analyses the characteristics and patterns of temperature effect on the industrial electricity usage. For this goal, the paper constructs and estimates a model which captures the properties of AMR time series including long-term trends, mid-term temperature effects, and short-term special day effects. Based on the estimated temperature response function and the temperature effect, we categorize the whole industry into two groups: one group with sharp temperature effect and the other with weak temperature effect. Furthermore, the industry group with sharp temperature effect is classified into a summer peak industry group and a winter peak industry group, based on the estimates of the temperature response function. These empirical results carry practical policy implications on the real time electricity demand management.

• Environmental and Resource Economics Review
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• v.17 no.2
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• pp.255-286
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• 2008

In this paper, it is tried to combine the decomposition method and econometric analysis for the extension of the decomposition method. Since two approaches approach the energy efficiency problem in the different perspectives, it is believed that it is hard to reconcile the results of two approaches. In the results of energy intensity effect analysis with the econometric method, it is found that the increase in the energy price results in the improvement of energy intensity effect. In enconometric analysis of energy efficiency, the coefficient of a time trend measured as a proxy of energy efficiency is significant and has a negative effect on the energy consumption. This finding implies the energy efficiency improves very slowly over time. In addition, the directions of energy efficiency improvement in the decomposition method are consistent with those in the econometric analysis in four industries. This finding indicates that two methods may be in complementary cooperation for the analysis of energy efficiency. Therefore, it is needed the efforts to seek the complementarity between two methods for the enhancement of academic and policy implications.

• Journal of Distribution Research
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• v.9 no.2
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• pp.75-99
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• 2004

The primary purpose of this research is to develop and test a model that explains the process of how trust in a supplier firm and salesperson through relational commitment influence buyer's positive and desirable behavior. In order to do so, we are empirically to examine how a supplier firm and salesperson trust can reinforce buyer's relational commitment leading to relational citizenship behavior using over 138 buying firms, Through structural equation modeling, we find that trust in a supplier firm and salesperson influence the relational commitment and relational commitment enhance relational citizenship behavior. However, trust in a supplier firm is unrelated to the buying firm's relational citizenship behavior whereas trust in salesperson has direct effect on relational citizenship behavior. Finally, we discuss several theoretical and practical implications, and suggest limitations for the research and future research issue.