• ETRI Journal
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• v.26 no.6
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• pp.661-664
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• 2004

The thermal behavior of an arrayed-waveguide grating made of a silica/polymer hybrid waveguide was examined. We experimentally confirmed that the hybrid waveguide is effective to decrease the temperature and polarization dependence of the center wavelength owing to the negative thermo-optic coefficient of the refractive index and extremely low baking temperature of the polymer cladding. However, the detachment of the polymer cladding from the silica core, which took place either during a repeated heat cycle test or during long-term storage in atmosphere, was a serious problem for practical use.

• Proceedings of the Korea Concrete Institute Conference
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• 2004.05a
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• pp.636-639
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• 2004

Reinforced concrete structures have been used for a long time. However, corrosion problem in reinforcing steel is inevitable, which results in the degradation of performance and the shortening of the life of structures. To overcome such problems, FRP(Fiber Reinforced Polymer) rebars have been developed. Due to their corrosion resistance and their superior mechanical properties, FRP rebars are increasingly applied to concrete structures in other countries. To obtain the composite action between FRP rebars and concrete, sufficient bond between two materials must be secured. But, the behavior of FRP rebars is different from that of steel rebars. Therefore, it is necessary to understand and develop the proper bond mechanism of FRP rebars to use them in concrete structures. This paper presents analytical results to investigate the bond-slip relationship between FRP rebars and concrete based on pull out tests.

• Journal of Fisheries and Marine Sciences Education
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• v.28 no.1
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• pp.47-58
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• 2016

The college students were faced with not just technical challenges that require skill acquisition but adaptive challenges that require transforming one's mindset to a more complex way of making meaning. The purpose of this study was confirmed the relations among the help-seeking behavior, self-disclosure and self-concealment of 343 female college students'. As a result of data analysis, positive help seeking attitude was higher when the level of self-concealment was lower and self-disclosure, but regarding help-seeking intention, consultation intention was shown to be higher in the case of lower self-disclosure and higher self-concealment. Therefore, female college students need to visit college consultation centers more often while attending college and it needs to provide those students with mediation so that they can use mental health consultation services easily.

• Nuclear Engineering and Technology
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• v.30 no.2
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• pp.91-98
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• 1998

Time history analysis is usually performed to characterize the nonlinear seismic behavior of a spent fuel storage rack(SFSR). In the past, the seismic analyses of the SFSR were performed with two-dimensional planar models, which could not account for torsional response and simultaneous multi-directional seismic input In this study, three-dimensional seismic analysis methodology is developed for the single SFSR using the ANSYS code. The 3D- Model can be used to determine the nonlinear behavior of the rack, i.e., sliding, uplifting, and impact evaluation between the fuel assembly and rack, and rack and the pool wall, This paper also reviews the 3-D modeling of the SFSR and the adequacy of the ANSYS for the seismic analysis. AS a result of the adquacy study, the method of ANSYS transient analysis with acceleration time history is suitable for the seismic analysis of highly nonlinear structure such as an SFSR but it isn't appropriate to use displacement time history of seismic input.

• Journal of the Korean Operations Research and Management Science Society
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• v.30 no.2
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• pp.81-104
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• 2005

In the past days, most of studies about users' behavior in online environments have been mainly focused on the adoption of website and internet shopping or shopping mall. But the generic model of website usage behavior has not been made and the leading theory of website usage behavior has not been existed. The purpose of this study consists of two parts: (1) to find the determinant variables of the website users' continuous using Intention in a certain website, (2) to examine the relative influences of the variables influencing the users' behavior in online environments. The framework of this study is based on the combination of some theories - Davis(1989)'s TAM, Fishbein(1975)'s TRA, Hoffman et al.(1997), Schneiderman(2000), Yoon(2002), Lee and Turban(2001), Sultan et al.(2002), Shankar et al.(2002a, 2002b), McKnight et al.(2002), Chen and Dhillon(2003), Heijden(2003) and so on. Major findings of this research are summarized as fellows: First, determinant of website continuous using intention was affected by 1) the-attitude and 2) the trust of the website except of perceived usefulness. Second, the website attitude was affected by the perceived usefulness, design, experience, reputation. But perceived ease of use did not affect the website attitude. Third, the website trust was affected by the perceived usefulness, perceived ease of use, design, experience of website. But the reputation of website did not determine the trust of Website in this research model.

• Journal of the Korean Society of Clothing and Textiles
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• v.31 no.11
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• pp.1542-1553
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• 2007

Recently, the growing of the aging population resulting from the medical and science development has made the elderly consumer as a new market. The purposes of this study were 1) to examine the purchase behavior of apparel products and hairdressing services of elderly consumers, 2) to investigate the purchase behavior in the apparel store and hairdressing shop on lifestyle types. Data were collected from 853 women in their 50s and 60s living in Busan. Data were analyzed by frequency analysis, descriptive analysis, factor analysis, Cronbach#s alpha, Chi-square analysis, cluster analysis, one-way ANOVA and Duncan test using SPSS WIN 12.0. The results of the study were as follows: First. when elderly consumers purchased apparel product, they were likely to use credit cards, to shop alone or with friends at a department store, and to use the store as information source. In their purchases of hairdressing services, they tended to visit the near shop for a permanent service bimonthly and to depend on their past experiences for hairdressing. Second, elderly consumers were classified by the lifestyle into the Active self-fidelitist, Economy family-oriented, and Passive-stagnant. The purchase behaviors in the apparel store and hairdressing shop were different among lifestyle types. Implications were suggested for the consumer behavior researchers and retailers of the elderly fashion market.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.30 no.3
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• pp.111-128
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• 2019

This study was conducted as part of an effort to vitalize policy information services (POINT) of National Library of Korea, Sejong. The authors examined information behavior and policy information service use behavior of policy information users and checked if there are any differences in information behavior by participants' occupations (public officials, researchers, and librarians). We carried out an online survey and collected 331 completed survey responses. Overall, the most frequently used type of material was research report, followed by journal article and monograph, etc. The participants frequently used search engines and policy information services to acquire policy information. Also, 47.7% of the participants were aware of and had usage experience of POINT. Furthermore, we found statistically significant differences in some aspects of policy information behavior and in perceptions toward POINT across participants' occupations. These findings suggest that National Library of Korea, Sejong needs to improve their services based on a better understanding on target users.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.28 no.6
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• pp.838-847
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• 2004

The effect of a metal mold on densification behavior of stainless steel 316L powder was investigated under warm isostatic pressing with a metal mold. We use lead as a metal mold and obtain experimental data of metal mold properties. To simulate densification behavior of metal powder, elastoplastic constitutive equation proposed by Shima and Oyane was implemented into a finite element program (ABAQUS) under warm die pressing and warm isostatic pressing with a metal mold. Finite element results were compared with experimental data for densification and deformation of metal powder under warm isostatic pressing and warm die pressing.

• Korean Journal of Child Studies
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• v.28 no.1
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• pp.205-216
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• 2007

An internet addiction measure(Park et al., 2001) and an asocial behavior measure(K. J. Lee, 1997) were administered to 232 6th-grade students. Statistical analyses were by mean-difference scores and t-test. Results showed that all aspects of internet addiction(preoccupation, compulsive use, relapse, tolerance/dependence and impediments in daily life) were related to both the inner asocial behaviors of depression, social withdrawal and over-anxiety and the external asocial behaviors of aggressiveness, delinquency and hyperactivity. The only exception was that tolerance/dependence was not related to delinquency. Boys addicted to the internet were more socially withdrawn, aggressive, delinquent and hyperactive than girls. From the results, it can be suggested that internet education should be carried out from the elementary educational level.

• Journal of Korean Academy of Rural Health Nursing
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• v.8 no.2
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• pp.43-51
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• 2013

Purpose: This study was done to identify the culture of college students in Jeju Province related to drinking alcohol and to analyze the relationship between drinking culture and social characteristics of the students. Methods: A questionnaire was distributed to 295 students at a college in Jeju province, students who met the criteria for the final analysis. Results: The results revealed that drinking most frequently began after graduation from high school (41.7%) and the reason for drinking was to get along with others (48.7%) and normal drinkers were common (69.6%). Gender, residence, experience of black outs and not to wishing to drink alcohol were significantly related to drinking characteristics. Satisfaction with college life, satisfaction with interpersonal relationships and stress level were not correlated with alcohol consumption. Conclusion: Educational and college authorities need to acknowledge colleges' responsibility in relation to their students' drinking behavior and to commit themselves to support an environment of responsible alcohol use.