• Journal of the Korea institute for structural maintenance and inspection
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• v.9 no.3
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• pp.87-92
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• 2005

The permeability of concrete affects largely on the durability of concrete, therefore it is required that the correct assessment and improvement of permeability. Therefore it is rational method that the permeability of concrete structures is estimated in the common use states under loading than in the early sound conditions. In this study, to improve the permeable efficiency of concrete, some kinds of fiber and resin are mixed in making of concrete specimens. And also, for the reasonable assessment of permeability, after 50% and 70% pre-loadings of its compressive strength were acted on the specimens, the tests were executed. From the results of this study, in the case of 50% pre-loading coefficients of permeability were increased about 1.4times against the nonpre-loading specimens and in the case of 70% pre-loading they were increased about 17.8times. And it turned out that hybrid steel fiber reinforcement is most effective for the improvement of permeable efficiency of concrete.

• Tunnel and Underground Space
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• v.20 no.5
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• pp.369-377
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• 2010

Applied to the braced wall in order to stabilize the adjacent tunnel. A pre-load of bracing was imposed to prevent the horizontal displacement of the braced wall during the ground excavation. For this purpose, real scale model tests were conducted, without and with pre-load on braced wall. Real scale model tests were conducted, without and with building load (0 m, 1D, 2D) on ground surface. As a result, it was found that the stability of the existing tunnel adjacent to the braced wall could be greatly enhanced when the horizontal displacement of the braced wall was reduced by applying a pre-load, which was larger than the designated axial force of bracing. In this paper, the behaviors of braced wall and adjacent tunnel was studied. Model tests in 1:10 scale were performed in real construction sequences. Adjacent tunnel was 12 m in diameter and the size of test pit was 2.0 m (width) ${\times}$ 6.0 m (height) ${\times}$ 4.0 m (length) in dimension.

• Journal of Korea Technology Innovation Society
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• v.21 no.3
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• pp.1050-1076
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• 2018

In this study, we focus on identifying the determinants of improving technology collaboration performance between buyer and supplier and the impact of the determinants on new product development performance. We adopted trust, control and information sharing as the determinants of technology collaboration and the frequency of new product introduction and ratio of new product on revenue as dependent variables. We conducted hierarchical regression and mediation analysis using the data collected from 600 Korean manufacturing firms by Korean Productivity Association and Ministry of Trade and Industry in 2012. The empirical findings indicate that trust, control and information sharing are positively associated with technology collaboration performance and the degree of technology collaboration is also positively associated with both new product development performance. In addition, new product development performance is not only affected by technology collaboration but also mediated by trust. This result implies that developing social capital, trust with partner play a important role in leading to better performance by open innovation.

• Asia Marketing Journal
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• v.5 no.4
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• pp.1-30
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• 2003

본 연구는 지금까지 학계에서 꾸준히 연구되고 있는 시장진입 순서의 효과에 관한 광범위한 문헌고찰을 통해 이제까지의 연구들을 유기적·인과적으로 연결시킬 수 있는 통합적인 틀을 제시하고, 기존 연구의 한계점을 바탕으로 진입순서 연구에 관한 새로운 접근을 시도하고자 하였다. 이를 위해 기존 연구를 크게 선발이점 발생에 관한 연구, 후발이점 발생에 관한 연구, 진입순서 효과에 영향을 미치는 조절변수에 관한 연구, 진입순서 의사결정에 영향을 미치는 선행변수에 관한 연구로 구분하고 각 부분별 문제점과 향후 연구방향을 도출하였다. 먼저, 기존 연구에서 선·후발 진입에 대한 정의와 기업이 속해있는 시장에 대한 정의가 불분명하게 이루어짐에 따라 그 효과가 매우 다르게 나타나고 있음을 지적하고, 동시에 효과가 나타나게 되는 메커니즘도 사후적인 해석 관점에서 이루어지고 있음을 지적하였다. 이 외에도 진입순서 효과에 영향을 미치는 조절변수에 관한 연구가 생산자 관점에서 주로 다루어져 실제로 제품을 소비하는 수요자의 특성을 감안한 연구가 필요함을 제시하였으며, 진입순서 의사결정에 영향을 미치는 선행변수로 자원기반 관점 요인과 시장·경쟁 요인뿐만 아니라 조직의 특성에 대한 연구가 고려되어야 함을 지적하였다. 마지막으로 진입순서 외에도 후발기업의 진입시차에 관한 추가적인 연구의 필요성을 언급하였다.

• Journal of Distribution Research
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• v.14 no.2
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• pp.97-125
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• 2009

The main purpose of this study is to provide a new approach to conceptualize and measure distrust based on existing researches concerning trust. One of the traditional approach has viewed that trust and distrust are opposed constructs placed on a continuous measure and that trust has positive impact and distrust has negative impact. But this study tries to test empirically that trust and distrust are independent constructs which can be distinguishable, and that both constructs are ambivalent. In addition, this study also tries to provide empirical test that distrust can have a positive effect on transaction relationship. We analyzed the possibility that both trust and distrust can be distinguishable and ambivalent with various antecedents and consequences of two constructs. We also analyzed the effect of distrust on cooperation and functional conflict in order to manifest the positive role of distrust as a relationship variable. The result for testing hypotheses is as follows: First, all hypotheses for antecedents and consequences of trust are significant, but some of hypotheses for antecedents and consequences of distrust are not significant. Second, both constructs can be distinguishable and ambivalent to some extent as the hypotheses for reputation are significant, which is one of the antecedents of distrust and considered jointly with other antecedents, transaction specific asset and environmental uncertainty. Lastly, the result showed the positive role of distrust that has a positive effect on functional conflict.

• Journal of Digital Convergence
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• v.13 no.1
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• pp.449-454
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• 2015

This study is done to analyze the social function of social games, propose a development model, and demonstrate predisposing factors and consequences on the model. Therefore, the predisposing variables on social functions of social games are explored through related theory and previous studies to propose the social function developing model of social games. Social function model of social games are classified in detail in terms of emotional ties, open communication, sense of belonging to a community and interaction to derive a measure for social function improvement, to prove social function improvement elements through various social network services and social game theories and to propose a social game development model.

• Proceedings of the KSR Conference
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• 2009.05b
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• pp.665-670
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• 2009

From the result of preceding study, there is no reinforcement such as dowel bar or etc. in Joint system of floating slab. Length of floating slab in preceding study is short than one of this study. If there is no reinforcement in the joint of long slab span, fracture of slab is predicted by difference between two slabs. Therefore using of dowel bar is demanded. In this study, General characteristic and preceding technology of dowel bar is researched for data of analysis study. And it is considered application of dowel bar in floating slab system.

• Korean Security Journal
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• no.34
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• pp.313-336
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• 2013

The purpose of this study is to derive an optimal regression model for occurrences of major crimes on a security company's stock price through identifying precedence of the occurrences of major crimes on the security company's stock price, relationship between the occurrences of major crimes and the security company's stock price. Followings are the results of this study. First, the occurrences of murder crime, robbery crime, rape crime, theft crime move along the security company's monthly stock price simultaneously, and the occurrence of violence crime precedes 6 months to the security company's monthly stock price depending on the results of cross-correlation analysis of precedence of occurrences of major crimes, such as murder crime, robbery crime, rape crime, theft crime, violence crime on the security company's monthly stock price. Second, the explanation of the occurrences of robbery crime, rape crime, theft crime on the security company's monthly stock price is 61.7%($R^2$ = .617) excluding murder crime, violence crime depending on the results of multiple regression analysis(stepwise method) by putting the occurrences of major crimes, such as murder crime, robbery crime, rape crime, theft crime, violence crime into the security company's monthly stock price.

• Phonetics and Speech Sciences
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• v.14 no.1
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• pp.1-11
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• 2022

The purpose of this study is to investigate the difference of vowel duration due to the voicing of word-final consonants in English and its relation to the types of word-final consonants (stops vs. fricatives), (partial) devoicing, and stop releasing. Addtionally, this study attempts to interpret the findings from the functional view that the vowels before voiced consonants are produced with a longer duration in order to enhance the salience of the voicing of word-final consonants. This study conducted a recording experiment with English native speakers, and measured the vowel duration, the degree of (partial) devoicing of word-final voiced consonants and the release of word-final stops. First, the results showed that the ratio of the duration difference was not influenced by the types of word-final consonants. Second, it was revealed that the higher the degree of (partial) devoicing of word-final voiced consonants, the longer vowel duration before word-final voiced consonants, which was compatible with the prediction based on the functional view. Lastly, the ratio of the duration difference was greater when the word-final stops were uttered with the release compared to when uttered without the release, which was not consistent with the functional view. These results suggest that it is not sufficient enough to explain the voicing effect by its function of distinguishing the voicing of word-final consonants.

• Journal of Korea Society of Industrial Information Systems
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• v.20 no.1
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• pp.103-112
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• 2015

Because of increased global competition, rapid technology development, and shorten product life cycle, manufacturing firms needed to quickly adapt to the changes of customer and competitive environment. During last 20 years, lean production and agile manufacturing have been used to enhance the efficiency and effectiveness of manufacturing firms. This study is purposed to examine the antecedents of agility and to statistically analyze not only the effect of antecedents on agility but also the effect of agility on business performance. This study used the structural equation model and found that intra-organizational cooperation, inter-organizational cooperation, and mutual trust had the significant effects on agility. And it was found that agility had a significant effect on operation performance and strategic performance. Agility has been one of important competitive advantages enhancing the supply chain process and firm's competitiveness. This study contributes to widen the practices of agility capability.